Actuators with toothed belt drive
Features
Linear actuators MKUVE..-ZR and MKUSE..-ZR comprise:
- a carriage available in various lengths
- a linear recirculating ball bearing and guideway assembly with
- two carriages per carriage unit
- one guideway
- a support rail in which the linear recirculating ball bearing and guideway assembly is mounted
- a toothed belt drive
- two return units.
Actuators MKUVE..-ZR and MKUSE..-ZR are linear units for positioning, handling and machining tasks. They have a guidance system that is wear-resistant and clearance-free. The drive elements are mounted in a self-supporting support rail. The toothed belt is a cost-effective solution where drive concepts running at high velocity are required.
In the case of series MKUVE..-ZR, each carriage unit is guided by means of two four-row carriages of the linear recirculating ball bearing and guideway assembly KUVE arranged in series.
In the case of series MKUSE..-ZR, each carriage unit is guided by means of two six-row carriages of the linear recirculating ball bearing and guideway assembly KUSE arranged in series.
Accessories available for the actuators include fasteners and connectors, couplings and coupling housings and electric drive components such as motors, motor/gearbox units and controllers.
The advantage of the actuator MKUSE..-ZR compared with the actuator MKUVE..-ZR is a significantly longer operating life under the same load.
Linear actuator without planetary gearbox
These linear actuators with a four-row linear recirculating ball bearing and guideway assembly (MKUVE) or six-row linear recirculating ball bearing and guideway assembly (MKUSE) are available in various designs, see table. The possible designs and combinations vary according to the size and actuator type.
Available designs
Suffix | Description | Design |
|---|---|---|
‒ | One driven carriage unit | Basic design |
LN | Low Noise design | Standard |
FA517 | Multi-piece support rail | Standard |
HS | High Speed design | Standard |
RB | Corrosion-resistant design | Special design |
W2 | Second, driven carriage unit | Standard |
N | Fixing slots in carriage unit | Standard |
Linear actuator with integrated planetary gearbox
These linear actuators with a four-row linear recirculating ball bearing and guideway assembly (MKUVE) or six-row linear recirculating ball bearing and guideway assembly (MKUSE) are available in various designs, see table. The possible designs and combinations vary according to the size and actuator type.
Available designs
Suffix | Description | Design |
|---|---|---|
‒ | One driven carriage unit | Basic design |
W2 | Second, driven carriage unit | Standard |
N | Fixing slots in carriage unit | Standard |
Special designs
Special designs are available by agreement. Examples of these are linear actuators:
- with more than two driven carriage units
- with two (or more) driven carriage units of different length
- with two (or more) driven carriage units of different design
- with a corrosion-resistant linear recirculating ball bearing and guideway assembly
- with reinforced or antistatic toothed belt or toothed belt of high temperature design
- without drive
- with T-strips inserted in the T-slots of the support rail
- with extended carriage units
- with compressed air connections in the support rail
- with a drive stud of special dimensions
- with special machining.
Carriage unit
The carriage unit comprises a saddle plate made from anodised aluminium profile and the two carriages of the linear recirculating ball bearing and guideway assembly.
The carriage unit contains integral tensioners on both sides for the toothed belt. Longer carriage units allow support of higher moment loads. Available carriage unit lengths, see table and ➤ Figure.
Lengths of carriages
Series | Carriage unit length | Suffix |
|---|---|---|
mm | ||
MKUVE15..-ZR | 140 | 140 |
260 | 260 | |
400 | 400 | |
MKUVE20..-C-ZR | 250 | 250 |
500 | 500 | |
MKUVE25..-ZR | 250 | 250 |
500 | 500 | |
MKUSE25..-ZR | 250 | 250 |
500 | 500 |
Carriage unit
Longer carriage unit or second carriage unit
The carriage units of linear actuators are available in various lengths. Longer carriage units allow support of higher moment loads.
Optionally, a second driven carriage unit can be fitted.
Movable or stationary carriage unit
A movable carriage unit is mounted and used as follows, ➤ Figure:
- where a long stroke length or total length is required
- predominantly for horizontal mounting.
A stationary carriage unit is mounted and used as follows:
- where a short stroke length is required
- predominantly for horizontal mounting.
Movable or stationary carriage unit
Lubrication
The raceways of the guideway are relubricated by means of lubrication nipples located on the sides of the carriage unit. The carriages have an initial greasing.
Sealing
The carriages are sealed.
Location
The carriage units have two T-slots. In the case of size 25, the carriage units are also available with threaded holes.
Support rail unit
The support rail unit is a composite unit. It comprises a support rail made from anodised aluminium and the guideway of a four-row linear recirculating ball bearing and guideway assembly KUVE (actuator series MKUVE..-ZR) or of a six-row linear recirculating ball bearing and guideway assembly KUSE (actuator series MKUSE..-ZR). The linear recirculating ball bearing and guideway assemblies are preloaded clearance-free and run without stick-slip.
Since the support rail has very high bending rigidity, it can be used to span large gaps.
Support rail length and segments
The maximum length of single-piece support rails for MKUVE15..-ZR is 6 000 mm, while in the case of MKUVE20..-ZR and MKUVE25..-ZR it is 8 000 mm. The minimum length of a segment of a multi-piece support rail is 500 mm. Longer lengths can be achieved by combining several support rail segments. The support rail segments are connected at their butt joints by means of an aluminium plate screw mounted to each side of the support rail and secured by dowel pins.
One return unit and the carriage unit are premounted on the first support rail segment. The other support rail segments with two aluminium plates screwed to each side of the support rail and secured by dowel pins, the second return unit and the toothed belt are supplied as individual components. These are fitted on site.
ATTENTION
Actuators of the High Speed design and actuators with an integrated planetary gearbox are not available with a multi-piece support rail.
Return unit
The return units comprise a housing made from anodised aluminium profile, two covers and a shaft unit, ➤ Figure. The shaft is supported on both sides by ball bearings lubricated for life. The toothed belt is wrapped by means of a gear mounted on the shaft. The return zone is protected against contamination by means of wiper brushes.
Return unit
Toothed belt
A reinforced toothed belt is fitted that allows the transmission of high tensile forces with a long rating life. Tensioning of the belt is carried out by means of the tensioning unit on the carriage unit.
Drive
The actuators are available without a drive shaft as well as with a drive shaft on the left side, right side or passing through the unit, see table.
Possible combinations and drive variants, see also ➤ Figure.
Suffixes
Drive variants | Suffix |
|---|---|
Drive shaft on left side | AL |
Drive shaft on right side | AR |
No drive shaft | OZ |
Drive shaft on both sides (right and left) | RL |
Drive variants – linear actuators
MKUVE..-ZR
MKUSE..-ZR
for T-nuts and T-bolts
on single-piece support rails ·
Drive elements
For actuators, Schaeffler also supplies components such as couplings, coupling housings and planetary gearboxes as well as servo motors and servo controllers, ➤ Figure.
Linear actuator with drive elements
Proven drive combinations
For vertical and horizontal applications, the necessary drive components can be combined as a function of the mass to be moved, the acceleration and the travel velocity of the carriages.
ATTENTION
The bearing load in the actuators must be checked; it is not taken into consideration in dimensioning of the motor. For vertical mounting, motors with a holding brake must be used.
If different loading and kinematic criteria apply the least favourable operating conditions should be used for calculation of the drive motor and design of the gearbox, coupling and servo controller.
Mechanical accessories
A large number of accessories are available for linear actuators with monorail guidance system and toothed belt drive. The allocation of accessories is valid if the data match the Technical principles and the Design and safety guidelines, link.
Allocation
Linear actuator / size | MKUVE..-ZR, MKUVE..-ZR-N | 15 | 20 | 25 | |
|---|---|---|---|---|---|
MKUSE..-ZR, MKUSE..-ZR-N | 25 | ||||
Fixing brackets | |||||
WKL-48×48×35 | ‒ | ‒ | | ||
WKL-65×65×30-N | | | | ||
WKL-65×65×35 | ‒ | ‒ | | ||
WKL-65×65×35-N | ‒ | | | ||
WKL-90×90×35-N | ‒ | | | ||
WKL-98×98×35 | ‒ | ‒ | | ||
Clamping lugs | |||||
| SPPR-24×20 | | ‒ | ‒ | |
SPPR-23×30 | ‒ | | ‒ | ||
SPPR-28×30 | ‒ | ‒ | | ||
T-nuts | |||||
| MU-DIN 508 M4×5 | | ‒ | ‒ | |
MU-M3×5 | | ‒ | ‒ | ||
MU-DIN 508 M6×8 | ‒ | | | ||
MU-M4×8 | ‒ | | | ||
T-nuts made from corrosion-resistant steel | |||||
MU-DIN 508 M4×5-RB | | ‒ | ‒ | ||
MU-DIN 508 M6×8-RB | ‒ | | | ||
T-bolts | |||||
SHR-DIN 787 M4×5×25 | | ‒ | ‒ | ||
SHR DIN 787-M8×8×32 | ‒ | | | ||
Rotatable T-nuts | |||||
| MU-M3×5-RHOMBUS | | ‒ | ‒ | |
MU-M4×8-RHOMBUS | ‒ | | | ||
MU-M6×8-RHOMBUS | ‒ | | | ||
Positionable T-nuts | |||||
MU-M4×5-POS | | ‒ | ‒ | ||
MU-M5×5-POS | | ‒ | ‒ | ||
MU-M4×8-POS | ‒ | | | ||
MU-M5×8-POS | ‒ | | | ||
MU-M6×8-POS | ‒ | | | ||
MU-M8×8-POS | ‒ | | | ||
 | Suitable. |
Allocation
Linear actuator / size | MKUVE..-ZR, MKUVE..-ZR-N | 15 | 20 | 25 | |
|---|---|---|---|---|---|
MKUSE..-ZR, MKUSE..-ZR-N | 25 | ||||
Hexagon nuts | |||||
| MU-ISO 4032 M5 | | ‒ | ‒ | |
MU-ISO 4032 M8 | ‒ | | | ||
T-strips | |||||
LEIS-M4/5-T-NUT-SB-ST | | ‒ | ‒ | ||
LEIS-M4/5-T-NUT-HR-ALU | | ‒ | ‒ | ||
LEIS-M4/5-T-NUT-ST | | ‒ | ‒ | ||
LEIS-M6/8-T-NUT-ST | ‒ | | | ||
LEIS-M6/8-T-NUT-SB-ST | ‒ | | | ||
LEIS-M8/8-T-NUT-SB-ST | ‒ | | | ||
LEIS-M6/8-T-NUT-HR-ST | ‒ | | | ||
LEIS-M6/8-T-NUT-HR-ALU | ‒ | | | ||
Connector sets (parallel connectors) | |||||
VBS-PVB8 | ‒ | | | ||
VBS-PVB8/10 | ‒ | | | ||
Slot closing strips | |||||
NAD-5×5,7 | | ‒ | ‒ | ||
NAD-8×4,5 | ‒ | | | ||
NAD-8×11,5 | ‒ | | | ||
| Suitable. |
 | Suitable and T-strips must already have been inserted at the time of despatch. |
Design and safety guidelines
Load carrying capacity and
load safety factor
The load carrying capacities and load safety factors to be observed differ as a function of the mounting position.
Deflection
The deflection of linear actuators is essentially dependent on the support spacing, the rigidity of the support rail, the adjacent construction and the bearing arrangement. As the rigidity of these components increases, the deflection of the actuators is reduced.
Diagrams
The diagram values are determined for a bearing arrangement or clamping which is in theory infinitely rigid and are subdivided into locating/non-locating and locating/locating bearing arrangements, starting ➤ Figure.
The deflection of the support rail is valid under the following conditions:
- support rail unit comprising carrier profile and guideway
- support spacings up to 8 000 mm
- introduction of the load at the centre of the carriage unit if this is at the centre point between the bearing points.
ATTENTION
The diagrams represent guide values only for the deflection of the support rail, starting ➤ Figure. The effect of deflection on the rating life of the guidance system is not taken into consideration.
It is not possible to provide deflection diagrams for actuators with two carriage units since there will be different spacings between the carriage units. In such cases, please consult the Schaeffler engineering service.
Deflection about the z axis
Deflection about the z axis
Deflection about the y axis
Deflection about the y axis
Deflection about the z axis
Deflection about the z axis
Deflection about the y axis
Deflection about the y axis
Deflection about the z axis
Deflection about the z axis
Deflection about the y axis
Deflection about the y axis
Deflection about the z axis
Deflection about the z axis
Deflection about the y axis
Deflection about the y axis
Idling drive torque
The idling drive torque M0 of linear actuators is calculated for a constant velocity and for a horizontal (M0h) or vertical (M0v) mounting position, starting ➤ Figure. The idling drive torque increases with increasing travel velocity. The data in the diagrams are maximum values.
Idling drive torque Horizontal mounting position
Idling drive torque Vertical mounting position
Idling drive torque
Horizontal mounting position
Idling drive torque
Vertical mounting position
Idling drive torque
Horizontal mounting position
Idling drive torque
Vertical mounting position
Idling drive torque
Horizontal mounting position
Idling drive torque
Vertical mounting position
Idling drive torque
Horizontal mounting position
Idling drive torque
Vertical mounting position
Idling drive torque
Horizontal mounting position
Idling drive torque
Vertical mounting position
Length calculation of actuators
The length calculation of actuators is based on the required effective stroke length NH. The effective stroke length NH must be increased by the addition of safety spacing values on both sides of the travel distance.
The total length Ltot of the actuator is determined from the support rail length L2 and the lengths of the return units L4. If two carriage units are present, both carriage unit lengths L1 and the spacing Lx1 must be taken into consideration.
Parameters for length calculation
| GH | mm | Total stroke length |
| NH | mm | Effective stroke length |
| S | mm | Safety spacing, for minimum values see table |
| L | mm | Length of carriage plate |
| L1 | mm | Total length of carriage unit |
| L2 | mm | Length of support rail |
| L4 | mm | Length of return unit |
| L6 | mm | Length of wiper brushes |
| L21 | mm | Length of cover plate |
| Ltot | mm | Total length of actuator |
| Lx1 | mm | Spacing between two carriage units. |
Total stroke length GH
The total stroke length GH is determined from the required effective stroke length and the safety spacings, which must be at least 85 mm.
Single-piece and multi-piece support rails
The maximum length of single-piece support rails, the maximum length of a support rail and the safety spacings S are dependent on size, see table.
Safety spacing S, maximum single-piece support rail length L2
Actuator | Maximum support rail length L2 (FA517) | Maximum length of single‑piece support rails L2 | Support rail segment length | Safety spacing S |
|---|---|---|---|---|
mm | mm | mm | ||
MKUVE15..-ZR | 6 000 | 6 000 | 1 | 80 |
MKUVE20..-C-ZR | 24 000 | 8 000 | 3 | 85 |
MKUVE25..-ZR | 24 000 | 8 000 | 3 | |
MKUSE25..-ZR | 24 000 | 8 000 | 3 | |
MKUVE25..-HS-ZR | ‒ | 6 000 | 1 | |
MKUVE25..-ZR-GTRI | ‒ | 8 000 | 1 | |
MKUSE25..-ZR-GTRI | ‒ | 8 000 | 1 |
Spacing Lx1 between carriage units
The minimum spacing Lx1 between two carriage units is 50 mm.
Total length Ltot and support rail length L2
The following ➤ equtions are designed for one and two carriage units. The parameters and their position can be found in ➤ Figure and ➤ Figure as well as in the table. If more than two carriage units are present, please consult us.
Length parameters for one carriage unit
One carriage unit Size: MKUVE15
Total length
Size: MKUVE15
Length parameters for one carriage unit
One carriage unit Sizes: MKUVE20, MKUVE25, MKUSE20
Total length Sizes: MKUVE20, MKUVE25, MKUSE20
Length parameters for two carriage units
One carriage unit Size: MKUVE15
Total length
Size: MKUVE15
Length parameters for two carriage units
Two carriage units Sizes: MKUVE20, MKUVE25, MKUSE20
Total length Sizes: MKUVE20, MKUVE25, MKUSE20
Length parameters
Designation | L | L1 | L4 | L6 | L21 | S |
|---|---|---|---|---|---|---|
mm | mm | mm | mm | mm | mm | |
MKUVE15-140-ZR | 140 | 178 | 69 | ‒ | 1 | 85 |
MKUVE15-260-ZR | 260 | 298 | ‒ | |||
MKUVE15-400-ZR | 400 | 438 | ‒ | |||
MKUVE20-250-C..-ZR..-N | 250 | 260 | 97 | 6 | ‒ | 85 |
MKUVE20-500-C..-ZR..-N | 500 | 510 | ||||
MKUVE25-250-ZR..-N MKUVE25-250-ZR..-GTRI-N | 250 | 263 | 115,5 | 6 | ‒ | 85 |
MKUVE25-500-ZR-N MKUVE25-500-ZR..GTRI-N | 500 | 513 | ||||
MKUSE25-250-ZR..-N MKUSE25-250-ZR..-GTRI | 250 | 263 | 115,5 | 6 | ‒ | 85 |
MKUSE25-500-ZR..-N MKUSE25-500-ZR..-GTRI | 500 | 513 |
Mass calculation
The total mass of an actuator is calculated from the mass of the actuator without a carriage unit, the carriage unit and the special design: multi-piece support rail (FA517), integrated gearbox (GTRI) and second carriage unit (W2), ➤ Figure. Insert the values from the table in the following ➤ equation. The values mLAW and mBOL are mandatory.
Basic and additional designs
Values for mass calculation
Designation | Mass | |
|---|---|---|
Carriage unit | Actuator without carriage unit | |
mLAW | mBOL | |
≈kg | ≈kg | |
MKUVE15-140-ZR | 0,75 | (Ltot · 0,0072) + 1,65 |
MKUVE15-260-ZR | 1,4 | (Ltot · 0,0072) + 1,4 |
MKUVE15-400-ZR..-N | 3,2 | (Ltot · 0,0072) + 1,4 |
MKUVE20-250-C..-ZR..-N | 2,5 | (Ltot – 194) · 0,0112 + 4,46 |
MKUVE20-500-C..-ZR..-N | 4,07 | |
MKUVE25-250-ZR..-N | 4,11 | (Ltot – 231) · 0,017 + 7,94 |
MKUVE25-500-ZR..-N | 6,37 | |
MKUVE25-250-ZR | 4,31 | |
MKUVE25-500-ZR | 6,77 | |
MKUSE25-250-ZR..-N | 3,95 | |
MKUSE25-500-ZR..-N | 6,21 | |
MKUSE25-250-ZR | 4,15 | |
MKUSE25-500-ZR | 6,61 | |
Values for mass calculation
Designation | Mass Design | ||||
|---|---|---|---|---|---|
m1 | m2 | m3 | |||
FA517.1 | FA517.2 | GTRI/4 | GTRI/8 | W2 | |
≈kg | ≈kg | ≈kg | ≈kg | ≈kg | |
MKUVE15-140-ZR | ‒ | ‒ | ‒ | ‒ | 0,75 |
MKUVE15-260-ZR | 1,4 | ||||
MKUVE15-400-ZR | 3,2 | ||||
MKUVE20-250-C..-ZR..-N | 2,3 | 4,5 | ‒ | ‒ | 2,5 |
MKUVE20-500-C..-ZR..-N | 4,07 | ||||
MKUVE25-250-ZR | 3,22 | 6,44 | 0,85 | 0,55 | 4,31 |
MKUVE25-500-ZR | 6,77 | ||||
MKUVE25-250-ZR..-N | 4,11 | ||||
MKUVE25-500-ZR..-N | 6,37 | ||||
MKUSE25-250-ZR | 3,22 | 6,44 | 0,85 | 0,55 | 4,15 |
MKUSE25-500-ZR | 6,61 | ||||
MKUSE25-250-ZR..-N | 3,95 | ||||
MKUSE25-500-ZR..-N | 6,21 | ||||
Lubrication
The guidance systems in linear actuators are initially greased with a high quality lithium complex soap grease KP2P-30 according to DIN 51825 and must be relubricated during operation.
The carriages in the actuators are sealed, have an initial greasing and can be relubricated. The ball bearings fitted in the return units of linear and clamping actuators or the tapered roller bearings in tandem actuators are sealed and lubricated for life.
Structure of suitable greases
Greases suitable for the linear recirculating ball bearing and guideway assemblies have the following composition:
- lithium soap or lithium complex soap grease with base oil having a mineral oil base
- special anti-wear additives for loads C/P ＜ 8, indicated by “P” in the DIN designation
- base oil viscosity ISO VG 68 to ISO VG 100
- consistency in accordance with NLGI grade 2.
If different greases are used, their miscibility and compatibility must be checked first.
Relubrication intervals
The relubrication intervals are essentially dependent on the following factors:
- the travel velocity of the carriage units
- the load
- the operating temperature
- the stroke length
- the environmental conditions and environmental influences
- the mounting position.
The cleaner the environment, the lower the lubricant consumption.
Calculation of the relubrication interval
Since it is not possible to calculate all the influencing factors, the time at which relubrication must be carried out and the quantity of lubricant which must be used can only be precisely determined under actual operating conditions. If no precise data are available, the values for many applications can be taken from the table. An approximation method can be used, however, to determine a guide value for many applications.
Relubrication must be carried out, irrespective of the result of this calculation, no more than 1 year after the last lubrication.
ATTENTION
Fretting corrosion is a consequence of lubricant starvation and is visible as a reddish discolouration of the rolling element raceways. Lubricant starvation can lead to permanent damage to the system and therefore to its failure. It must be ensured that the lubrication intervals are reduced accordingly in order to prevent fretting corrosion.
When calculating the relubrication interval, the grease operating life must also be checked. This is restricted to a maximum of 3 Cages due to the ageing resistance of the grease. It is the user’s responsibility to obtain information on this matter from the lubricant manufacturer.
Relubrication quantities
Relubrication should be carried out wherever possible with several partial quantities at various times instead of the complete quantity at the time of the relubrication interval. Grease quantities, see table.
Grease quantities
Linear actuator | Relubrication quantity |
|---|---|
≈g | |
MKUVE15..-ZR | 2 to 3 |
MKUVE20..-C-ZR | 4 to 5 |
MKUVE25..-ZR | 5 to 6 |
MKUSE25..-ZR | 6 to 7 |
MKUVE20..-C-LN-ZR | 4 to 5 |
MKUVE25..-LN-ZR | 5 to 6 |
MKUVE25..-HS-ZR | 5 to 6 |
MKUVE25..-ZR..-GTRI MKUSE25..-ZR..-GTRI | 5 to 6 |
Relubrication procedure
Relubrication should be carried out whilst the carriage unit is moving and warm from operation over a minimum stroke length corresponding to one carriage unit length.
During lubrication, it must be ensured that the grease gun, grease, lubrication nipple and the environment of the lubrication nipple are clean.
ATTENTION
The lubrication method involves loss of lubricant. The used lubricant must be collected and disposed of by methods that help to protect the environment.
The use of lubricants is governed by national regulations for environmental protection and occupational safety as well as information from the lubricant manufacturers. These regulations must be observed in all cases.
Lubrication nipples
In the case of actuators MKUVE..-ZR and MKUSE..-ZR, relubrication of the integrated guidance system is carried out exclusively via a funnel type lubrication nipple in the longitudinal face of the carriage unit, ➤ Figure.
Funnel type lubrication nipple NIP DIN 3405-A M6
The carriage units of size 20 and 25 can be connected to a semi-automatic or fully automatic central lubrication system. In this case, the funnel type lubrication nipples must be replaced by a straight or angled screw-in connector with a M6×1 thread. The central lubrication system is connected by means of pipes or hoses.
Relubrication points
The carriages have funnel type lubrication nipples according to DIN 3405-A M6 on the right or left longitudinal side of each carriage unit. Furthermore, they can be relubricated, ➤ Figure, ➤ Figure, ➤ Figure and table.
In the case of actuators with a longer carriage unit, both carriages are relubricated via separate lubrication ducts.
ATTENTION
During lubrication of actuators, all lubrication points on one longitudinal side of a carriage unit must always be provided with lubricant.
Lubrication points
on carriage
Lubrication points on short carriage unit
Lubrication points on long carriage unit
Position of relubrication points
Designation | Mounting dimensions | |||
|---|---|---|---|---|
S56 | h56 | l56 | l57 | |
mm | mm | mm | mm | |
MKUVE15-140-ZR | ‒ | 7,1 | 104,4 | ‒ |
MKUVE15-260-ZR | ‒ | 7,1 | 130 | ‒ |
MKUVE15-400-ZR | ‒ | 7,1 | 200 | ‒ |
MKUVE20-250-C..-ZR..-N | 15 | 13,5 | 125 | ‒ |
MKUVE20-500-C..-ZR..-N | 297 | |||
MKUVE25-250..-ZR | 15 | 15,8 | 133,5 | ‒ |
MKUVE25-500..-ZR | ‒ | |||
MKUSE25-250..-ZR | 15 | 15,8 | 133,5 | ‒ |
MKUSE25-500..-ZR | 257,5 | ‒ | ||
Position of lubrication points, basic carriage
T-slots
The T-slots in the support rail and the carriage unit are designed for T-bolts according to DIN 787 and T-nuts according to DIN 508 (with the exception of T-slot size 4,5).
Sizes of T-slots in support rail and carriage unit
Dimensions of T-slots
Designation | Support rail | Carriage unit | ||
|---|---|---|---|---|
Lateral | Bottom | Top | Lateral | |
MKUVE15..-ZR | | | ‒ | ‒ |
MKUVE20..-ZR | | | | |
MKUVE25..-ZR | | | | ‒ |
MKUSE25..-ZR | | | | ‒ |
Filling openings
The filling opening is always on the opposing side to the drive, ➤ Figure.
Filling opening in the support rail
Connectors for switching tags
Switching tags can be screw mounted to the carriage unit in order to activate switches in the adjacent construction. The position and size are dependent on the size, ➤ Figure and table.
Connectors for switching tags on the carriage unit
Mounting dimensions for switching tags
Series | Mounting dimensions | ||||
|---|---|---|---|---|---|
Actuator | JL58 | l58 | h58 | G58 | t58 max |
mm | mm | mm | mm | mm | |
MKUVE15-140-ZR** | 15 | 62,5 | 8 | M3 | 10 |
MKUVE15-260-ZR** | 15 | 51 | 8 | M3 | 10 |
MKUVE15-400-ZR** | 15 | 51 | 8 | M3 | 10 |
MKUVE20-250-C..-ZR..-N | ‒ | ‒ | 12 | ‒ | ‒ |
MKUVE20-500-C..-ZR..-N | |||||
MKUVE25-250..-ZR | 40 | 10 | 15 | M5 | 10 |
MKUVE25-500..-ZR | |||||
MKUSE25-250..-ZR | 40 | 10 | 15 | M5 | 10 |
MKUSE25-500..-ZR | |||||
**Switching tags on both sides of the carriage unit (symmetrical).
**Carriage unit with lateral T-slot.
Mounting position and mounting arrangement
Due to their construction and the linear guidance system fitted, actuators are suitable for all mounting positions and mounting arrangements, ➤ Figure, ➤ Figure and ➤ Figure.
Movable or stationary carriage
The actuators can be used in the “common” horizontal mounting position and also in a vertical mounting position. In particular, tandem actuators with a triple toothed belt drive and the associated level of security offer good characteristics for fulfilling requirements involving a vertical axis.
Mounting of actuators with a carriage unit to one side or suspended overhead is possible. In such cases, please consult the Schaeffler engineering service.
ATTENTION
The carriage unit and load must be secured against autonomous travel or dropping if the actuators are used in a vertical or tilted mounting position. This can be achieved, for example, by means of a brake or counterweight. The drop guard must function in manual operation as well as in motor operation, especially if the motor has no current.
Safety guidelines, especially in relation to personal protection, must be observed.
Mounting positions
Mounting positions
Mounting
The normal steps in the mounting of an actuator are as follows:
- location of the support rail on the adjacent construction
- mounting of the components to be moved on the carriage unit or carriage units.
Fixing by means of T-nuts
In order to facilitate the insertion of T-nuts and T-bolts, all support rail segments have lateral filling openings.
Actuators longer than 8 000 mm
Actuators longer than 8 000 mm are supplied as multi-piece units. These are supplied partially assembled after function checking. At their destination, these actuators must then be assembled in accordance with the fitting manual supplied.
Any parts necessary for joining of the support rail segments and screw mounting of the second return unit are also supplied. These include retaining plates, fixing screws, nuts and dowels.
Actuators longer than 8 000 mm, LT1 is always on the drive side
Interchange of actuator components
For the fitting and assembly of actuator components, a fitting and maintenance manual is available for each series of actuator. Please consult the Schaeffler engineering service.
Maintenance
Failure to carry out maintenance, incorrect maintenance, assembly errors and lubrication errors as well as inadequate protection against contamination can lead to premature failure of actuators.
Maintenance work is restricted in general to relubrication, cleaning and regular visual inspection for damage.
Maintenance intervals, especially the intervals between relubrication, are influenced by:
- the travel velocity of the carriage unit
- the load
- the temperature
- the stroke length
- the environmental conditions and influences.
ATTENTION
Guidance parts relevant to function must be greased and supplied with lubricant via appropriate lubrication points.
Cleaning
If heavy contamination is present, actuators must be cleaned in order to ensure reliable function. Suitable cleaning tools include paintbrushes, soft brushes and soft cloths.
ATTENTION
Abrasives, petroleum ether and oils must not be used.
Accuracy
Length tolerances
The length tolerances of actuators are shown in ➤ Figure and the table. The data are valid for all actuators described in this chapter.
Length tolerances
Tolerances
Total length Ltot of actuator | Tolerance | |||||
|---|---|---|---|---|---|---|
mm | mm | |||||
Single-piece actuator | Ltot ＜ | 1 000 | ±2 | |||
1 000 | ≦ | Ltot ＜ | 2 000 | ±3 | ||
2 000 | ≦ | Ltot ＜ | 4 000 | ±4 | ||
4 000 | ≦ | Ltot | ±5 | |||
Multi-piece actuator | All lengths | ±0,1% | of Ltot | |||
Straightness of support rails
The support rails in actuators are precision straightened and the tolerances are better than DIN 17615.
The tolerances are arithmetic mean values and are stated for individual series and sizes, see tables.
Tolerances
Size: MKUVE15
Length L2 of support rail | MKUVE15..-ZR | |||||
|---|---|---|---|---|---|---|
t2 | t3 | Torsion | ||||
mm | mm | mm | mm | |||
L2 ≦ | 1 000 | 0,4 | 0,3 | 0,3 | ||
1 000 | ＜ | L2 ≦ | 2 000 | 0,8 | 0,6 | 0,6 |
2 000 | ＜ | L2 ≦ | 3 000 | 1,2 | 0,9 | 0,9 |
3 000 | ＜ | L2 ≦ | 4 000 | 1,5 | 1,2 | 1,2 |
4 000 | ＜ | L2 ≦ | 5 000 | 1,9 | 1,5 | 1,5 |
5 000 | ＜ | L2 ≦ | 6 000 | 2,5 | 1,8 | 1,8 |
Tolerances
Sizes: MKUVE20, MKUVE25, MKUSE25
Length L2 | MKUVE20..-C-ZR | MKUSE25..-ZR MKUVE25..-ZR | |||||||
|---|---|---|---|---|---|---|---|---|---|
t2 | t3 | Torsion | t2 | t3 | Torsion | ||||
mm | mm | mm | mm | mm | mm | mm | |||
L2 ≦ | 1 000 | 0,4 | 0,3 | 0,8 | 0,4 | 0,3 | 0,5 | ||
1 000 | ＜ | L2 ≦ | 2 000 | 0,8 | 0,5 | 1 | 0,8 | 0,5 | 1 |
2 000 | ＜ | L2 ≦ | 3 000 | 1,2 | 0,7 | 1,2 | 1,2 | 0,7 | 1,5 |
3 000 | ＜ | L2 ≦ | 4 000 | 1,5 | 1 | 1,6 | 1,5 | 1 | 2 |
4 000 | ＜ | L2 ≦ | 5 000 | 1,9 | 1,2 | 1,8 | 1,9 | 1,2 | 2,5 |
5 000 | ＜ | L2 ≦ | 6 000 | 2,5 | 1,5 | 2 | 2,5 | 1,5 | 3 |
6 000 | ＜ | L2 ≦ | 7 000 | 2,9 | 1,8 | 2,2 | 2,9 | 1,8 | 3,5 |
7 000 | ＜ | L2 | 3,4 | 2,1 | 2,4 | 3,4 | 2,1 | 4 | |
➤ Figure shows the method for determining the straightness of the support rail.
Measurement method for straightness tolerances
Tandem actuators with triple toothed belt drive
Features
Tandem actuators MDKUVE..-3ZR and MDKUSE..-3ZR comprise:
- a carriage unit available in various lengths
- a support rail
- two linear recirculating ball bearing and guideway assemblies arranged in parallel
- a triple toothed belt drive
- two return units (drive with three toothed belts).
Actuators MDKUVE..-3ZR and MDKUSE..-3ZR correspond substantially in their basic design and technical characteristics to the actuators MKUVE..-ZR and MKUSE..-3ZR. The following pages describe exclusively the differences, all other data on the features of tandem actuators matches the features of linear actuators.
Tandem actuators are suitable for vertical applications, since the triple toothed belt arrangement allows very high operating forces.
Designs
Tandem actuators MDKUVE..-3ZR and MDKUSE..-3ZR are available in various designs, see table.
Available designs
Suffix | Description | Design |
|---|---|---|
‒ | One driven carriage unit | Basic design |
FA517 | Multi-piece support rail | Standard |
W2 | Second, driven carriage unit | Standard |
N | Fixing slots in carriage unit | Standard |
Special designs
Special designs are available by agreement. Examples of these are tandem actuators:
- with more than two driven carriage units
- with two (or more) driven carriage units of different length
- with reinforced or antistatic toothed belt or toothed belt of high temperature design
- without drive
- with T-strips inserted in the T-slots of the support rail
- with an extended carriage unit
- with compressed air connections in the support rail
- with a drive stud of special dimensions
- with special machining.
Carriage unit
The carriage unit comprises a saddle plate made from anodised aluminium profile and the four carriages of the two linear recirculating ball bearing and guideway assemblies. The carriage unit is driven by means of three toothed belts arranged in parallel.
The carriage unit contains integral tensioners on both sides for the toothed belts. The 500 mm long carriage unit can support high moment forces. Available carriage unit lengths are shown in the table.
Carriage unit
Lengths of carriage units
Series | Carriage unit length | Suffix |
|---|---|---|
mm | ||
MDKUVE15..-3ZR | 240 | 240 |
500 | 500 | |
MDKUVE25..-3ZR | 365 | 365 |
500 | 500 | |
MDKUVE35..-3ZR | 500 | 500 |
Location
The carriage units have T-slots for fixing to the adjacent construction.
Support rail unit
The support rail unit is a composite unit. It comprises a support rail made from anodised aluminium and two guideways arranged in parallel for the linear recirculating ball bearing and guideway assemblies. The guidance systems can be four-row linear recirculating ball bearing and guideway assemblies KUVE (actuator series MDKUVE..‑3ZR) or six-row linear recirculating ball bearing and guideway assemblies KUSE (actuator series MDKUSE..-3ZR). The linear recirculating ball bearing and guideway assemblies are preloaded clearance-free and run without stick-slip.
Since the support rail has very high bending rigidity, it can be used to span large gaps.
Support rail length and segments
The maximum length of a single-piece support rail is 6 000 mm. The support rail segments are connected at their butt joints by means of an aluminium plate screw mounted to each side of the support rail and secured by dowel pins. The minimum length of a segment of a multi-piece support rail is 1 000 mm.
One return unit and the carriage unit are premounted on the first support rail segment. The other support rail segments with two aluminium plates screwed to each side of the support rail and secured by dowel pins, the second return unit and the toothed belt are supplied as individual components. These are fitted on site.
Return unit
The return units comprise a housing made from anodised aluminium profile, two covers and a shaft unit, ➤ Figure. The shaft is supported on both sides by tapered roller bearings lubricated for life. The toothed belt is wrapped in the return unit by means of a gear mounted on the shaft. The return zone is protected against contamination by means of wiper brushes.
Return unit for triple toothed belt drive
Toothed belt
The tandem actuators are fitted with reinforced toothed belts that allows the transmission of high tensile forces with a long rating life. These toothed belts are tensioned by means of tensioning units in the carriage units.
Drive
The actuators are available without a drive shaft as well as with a drive shaft on the left side, right side or passing through the unit, see table.
Possible combinations and drive variants, see also ➤ Figure.
Suffixes
Drive variants | Suffix |
|---|---|
Drive shaft on left side | AL |
Drive shaft on right side | AR |
No drive shaft | OZ |
Drive shaft on both sides (right and left) | RL |
Drive variants – tandem actuators
MDKUVE..-3ZR
MDKUSE..-3ZR
on single-piece support rails ·
Proven drive combinations
For vertical and horizontal applications, the necessary drive components can be combined as a function of the mass to be moved, the acceleration and the travel velocity of the carriages.
ATTENTION
The bearing load in the actuators must be checked; it is not taken into consideration in dimensioning of the motor. For vertical mounting, motors with a holding brake must be used.
If different loading and kinematic criteria apply the least favourable operating conditions should be used for calculation of the drive motor and design of the gearbox, coupling and servo controller.
Mechanical accessories
A large number of accessories are available for tandem actuators with monorail guidance system and triple toothed belt drive. The allocation of accessories is valid if the data match the Technical principles and the Design and safety guidelines, link.
Allocation
Linear actuator / size | MDKUVE..-3ZR-N | 15 | 25 | 35 | |
|---|---|---|---|---|---|
MDKUSE..-3ZR-N | 25 | ||||
Fixing brackets | |||||
WKL-48×48×35 | | | ‒ | ||
WKL-65×65×30-N | | | ‒ | ||
WKL-65×65×35 | | | ‒ | ||
WKL-65×65×35-N | | | ‒ | ||
WKL-90×90×35-N | | | | ||
WKL-98×98×35 | ‒ | | ‒ | ||
Clamping lugs | |||||
SPPR-23×30 | | | ‒ | ||
SPPR-28×30 | | | ‒ | ||
SPPR-31×30 | ‒ | ‒ | | ||
SPPR-34×36 | ‒ | ‒ | | ||
T-nuts | |||||
| MU-DIN 508 M4×5 | | ‒ | ‒ | |
MU-M3×5 | | ‒ | ‒ | ||
MU-DIN 508 M6×8 | | | ‒ | ||
MU-M4×8 | | | ‒ | ||
MU-DIN 508 M8×10 | ‒ | | | ||
MU-M6×10 | ‒ | | | ||
T-nuts made from corrosion-resistant steel | |||||
MU-DIN 508 M4×5-RB | | ‒ | ‒ | ||
MU-DIN 508 M6×8-RB | | | ‒ | ||
MU-DIN 508 M8×10-RB | ‒ | | | ||
T-bolts | |||||
SHR-DIN 787 M4×5×25 | | ‒ | ‒ | ||
SHR DIN 787-M8×8×32 | | | ‒ | ||
SHR DIN 787-M10×10×40 | ‒ | | | ||
Rotatable T-nuts | |||||
MU-M3×5-RHOMBUS | | ‒ | ‒ | ||
MU-M4×8-RHOMBUS | | | ‒ | ||
MU-M6×8-RHOMBUS | | | ‒ | ||
MU-M8×10-RHOMBUS | ‒ | | | ||
| Suitable. |
Allocation
Linear actuator / size | MDKUVE..-3ZR-N | 15 | 25 | 35 | |
|---|---|---|---|---|---|
MDKUSE..-3ZR-N | 25 | ||||
Positionable T-nuts | |||||
MU-M4×5-POS | | ‒ | ‒ | ||
MU-M5×5-POS | | ‒ | ‒ | ||
MU-M4×8-POS | | | ‒ | ||
MU-M5×8-POS | | | ‒ | ||
MU-M6×8-POS | | | ‒ | ||
MU-M8×8-POS | | | ‒ | ||
Hexagon nuts | |||||
| MU-ISO 4032 M5 | | ‒ | ‒ | |
MU-ISO 4032 M8 | | | ‒ | ||
MU-ISO 4032 M10 | ‒ | | | ||
T-strips | |||||
LEIS-M4/5-T-NUT-SB-ST | | ‒ | ‒ | ||
LEIS-M4/5-T-NUT-HR-ALU | | ‒ | ‒ | ||
LEIS-M6/8-T-NUT-SB-ST | | | ‒ | ||
LEIS-M8/8-T-NUT-SB-ST | | | ‒ | ||
LEIS-M6/8-T-NUT-HR-ST | | | ‒ | ||
LEIS-M6/8-T-NUT-HR-ALU | | | ‒ | ||
LEIS-M4/5-T-NUT-ST | | ‒ | ‒ | ||
LEIS-M6/8-T-NUT-ST | | | ‒ | ||
LEIS-M8/10-T-NUT-ST | ‒ | | | ||
Connector sets (parallel connectors) | |||||
VBS-PVB8 | | | ‒ | ||
VBS-PVB10 | ‒ | | | ||
VBS-PVB8/10 | | | | ||
Slot closing strips | |||||
NAD-5×5,7 | | ‒ | ‒ | ||
NAD-8×4,5 | | | ‒ | ||
NAD-8×11,5 | | | ‒ | ||
NAD-10×6,5 | ‒ | | | ||
| Suitable. |
| Suitable and T-strips must already have been inserted at the time of despatch. |
Design and safety guidelines
Load carrying capacity and
load safety factor
The load carrying capacities and load safety factors to be observed differ as a function of the mounting position.
Deflection
The deflection of tandem actuators is essentially dependent on the support spacing, the rigidity of the support rail, the adjacent construction and the bearing arrangement. As the rigidity of these components increases, the deflection of the actuators is reduced.
Diagrams
The diagram values are determined for a bearing arrangement or clamping which is in theory infinitely rigid and are subdivided into locating/non-locating and locating/locating bearing arrangements, starting ➤ Figure.
The deflection of the support rail is valid under the following conditions:
- support rail unit comprising carrier profile and guideway
- support spacings up to 6 000 mm
- introduction of the load at the centre of the carriage unit if this is at the centre point between the bearing points.
ATTENTION
The diagrams represent guide values only for the deflection of the support rail, starting ➤ Figure. The effect of deflection on the rating life of the guidance system is not taken into consideration.
It is not possible to provide deflection diagrams for actuators with two carriage units since there will be different spacings between the carriage units. In such cases, please consult the Schaeffler engineering service.
Deflection about the z axis
Deflection about the z axis
Deflection about the y axis
Deflection about the y axis
Deflection about the z axis
Deflection about the z axis
Deflection about the y axis
Deflection about the y axis
Deflection about the z axis
Deflection about the z axis
Deflection about the y axis
Deflection about the y axis
Idling drive torque
The idling drive torque M0 of tandem actuators is calculated for a constant velocity and for a horizontal (M0h) or vertical (M0v) mounting position, starting ➤ Figure. The idling drive torque increases with increasing travel velocity. The data in the diagrams are maximum values.
Idling drive torque
Horizontal mounting position
Idling drive torque
Vertical mounting position
Idling drive torque
Horizontal mounting position
Idling drive torque
Vertical mounting position
Idling drive torque
Horizontal mounting position
Idling drive torque
Vertical mounting position
Idling drive torque Horizontal mounting position
Idling drive torque Vertical mounting position
Length calculation of tandem actuators
The length calculation of tandem actuators is based on the required effective stroke length NH. The effective stroke length NH must be increased by the addition of safety spacing values on both sides of the travel distance.
The total length Ltot of the actuator is determined from the support rail length L2 and the lengths of the return units L4. If two carriage units are present, both carriage units lengths L1 and the spacing Lx1 must be taken into consideration.
Parameters for length calculation
| GH | mm | Total stroke length |
| NH | mm | Effective stroke length |
| S | mm | Safety spacing, for minimum values see table |
| L | mm | Length of carriage plate |
| L1 | mm | Total length of carriage unit |
| L2 | mm | Length of support rail |
| L4 | mm | Length of return unit |
| L6 | mm | Length of wiper brushes |
| Ltot | mm | Total length of actuator |
| Lx1 | mm | Spacing between two carriage units. |
Total stroke length GH
The total stroke length GH is determined from the required effective stroke length and the safety spacings, which must be at least 85 mm.
Single-piece and multi-piece support rails
The maximum length of single-piece support rails is 6 000 mm. Longer support rails are supplied in units comprising several segments. The maximum length of a multi-piece support rail is 18 000 mm. The minimum length of a support rail segment is 1 000 mm. A maximum of three support rail segments is permissible.
Spacing Lx1 between carriage units
The minimum spacing for Lx1 between two carriage units is 100 mm.
Total length Ltot and support rail length L2
The following ➤ equtions are designed for one and two carriage units. The parameters and their position can be found in ➤ Figure and ➤ Figure as well as in the table. If more than two carriage units are present, please consult us.
Length parameters for one carriage unit
One carriage unit
Total length
Length parameters for two carriage units
Two carriage units
Total length
Length parameters
Designation | L | L1 | L4 | L6 | S |
|---|---|---|---|---|---|
mm | mm | mm | mm | mm | |
MDKUVE15-240-3ZR-N | 240 | 282 | 80 | 6 | 85 |
MDKUVE15-500-3ZR-N | 500 | 542 | |||
MDKUVE25-365-3ZR-N | 365 | 405 | 115,5 | 6 | 85 |
MDKUVE25-500-3ZR-N | 500 | 540 | |||
MDKUSE25-365-3ZR-N | 365 | 405 | 115,5 | 6 | 85 |
MDKUSE25-500-3ZR-N | 500 | 540 | |||
MDKUVE35-500-3ZR-N | 500 | 538 | 170 | 10 | 85 |
Mass calculation
The total mass of an actuator is calculated from the mass of the actuator without a carriage unit, the carriage unit and the special design: multi-piece support rail (FA517) and second carriage unit (W2), ➤ Figure. Insert the values from the table in the following ➤ equation. The values mLAW and mBOL are mandatory.
Basic and additional designs
Values for mass calculation
Designation | Mass | |
|---|---|---|
Carriage unit | Actuator without carriage unit | |
mLAW | mBOL | |
≈kg | ≈kg | |
MDKUVE15-240-3ZR..-N | 4,11 | (Ltot – 160)×0,016 2 + 7,85 |
MDKUVE15-500-3ZR..-N | 7,82 | |
MDKUVE25-365-3ZR..-N | 12,81 | (Ltot – 231)×0,032 2 + 18,76 |
MDKUVE25-500-3ZR..-N | 16 | |
MDKUSE25-365-3ZR..-N | 12,65 | |
MDKUSE25-500-3ZR..-N | 15,84 | |
MDKUVE35-500-3ZR..-N | 38,49 | (Ltot – 340)×0,077 3 + 97,72 |
Values for mass calculation
Designation | Mass Design | ||
|---|---|---|---|
m1 | m3 | ||
FA517.1 | FA517.2 | W2 | |
≈kg | ≈kg | ≈kg | |
MDKUVE15-240-3ZR..-N | 1,84 | 3,69 | 4,11 |
MDKUVE15-500-3ZR..-N | 7,82 | ||
MDKUVE25-365-3ZR..-N | 3,68 | 12,81 | |
MDKUVE25-500-3ZR..-N | 16 | ||
MDKUSE25-365-3ZR..-N | 12,65 | ||
MDKUSE25-500-3ZR..-N | 15,84 | ||
MDKUVE35-500-3ZR..-N | 11,5 | 23 | 36,89 |
Lubrication
The information on lubrication of tandem actuators matches the information on the lubrication of linear actuators. The only differences are in the relubrication quantities and relubrication points.
Relubrication quantities
Relubrication should be carried out wherever possible with several partial quantities at various times instead of the complete quantity at the time of the relubrication interval.
Grease quantities
Tandem actuator | Relubrication quantity per carriage | |||||
|---|---|---|---|---|---|---|
Drive side, | Non-locating bearing side, per lubrication nipple and per longitudinal face | |||||
≈g | ≈g | |||||
MDKUVE15-240-3ZR MDKUVE15-500-3ZR | 2,5 | to | 3 | 2,5 | to | 3 |
MDKUVE25-365-3ZR MDKUVE25-500-3ZR | 3 | to | 5,5 | 3 | to | 5,5 |
MDKUSE25-365-3ZR MDKUSE25-500-3ZR | 6 | to | 10 | 6 | to | 10 |
MDKUVE35-500-3ZR | 6,5 | to | 10 | 6,5 | to | 10 |
Relubrication points
Each carriage unit in a tandem actuator with linear recirculating ball bearing and guideway assembly and toothed belt drive is equipped with four funnel type lubrication nipples to DIN 3405‑A M6, ➤ Figure and ➤ Figure. The tandem actuator MDKUVE15-240..-3ZR can be relubricated via two funnel type lubrication nipples (one per side). It can be lubricated from either the left or right side.
Lubrication points
Lubrication ducts in the carriage unit
ATTENTION
During lubrication of actuators, all lubrication points on one longitudinal side of a carriage unit must always be provided with lubricant.
Lubrication points
Position of relubrication points
Designation | Mounting dimensions | |||
|---|---|---|---|---|
S56 | h56 | l56 | l57 | |
mm | mm | mm | mm | |
MDKUVE15-240..-3ZR | 15 | 20 | 118 | ‒ |
MDKUVE15-500..-3ZR | 124,5 | 251 | ||
MDKUVE25-365..-3ZR | 15 | 28 | 132,8 | 99,4 |
MDKUVE25-500..-3ZR | 140,2 | 219,5 | ||
MDKUSE25-365..-3ZR | 15 | 28 | 132,8 | 99,4 |
MDKUSE25-500..-3ZR | 140,2 | 219,5 | ||
MDKUVE35-500..-3ZR | 36 | 30 | 182,5 | 135 |
T-slots
The T-slots in the support rail and the carriage unit are designed for T-bolts according to DIN 787 and T-nuts according to DIN 508, ➤ Figure. T-nuts and T-bolts are inserted using filling slots in the support rail.
Sizes of T-slots in support rail and carriage unit
Dimensions of T-slots
Designation | Support rail | Carriage unit | ||
|---|---|---|---|---|
Lateral | Bottom | Top | Lateral | |
MDKUVE15..-3ZR | | | | ‒ |
MDKUVE15..-3ZR | | |||
MDKUVE25..-3ZR | | | | ‒ |
MDKUSE25..-3ZR | ||||
MDKUVE35..-3ZR | | | | |
Filling openings
The filling openings are located on three sides of the tandem actuator: on both sides and underneath, ➤ Figure and table.
Filling opening in the support rail
Dimensions of filling openings in support rails
Designation | Filling opening | Filling opening | ||||
|---|---|---|---|---|---|---|
T-slot size | b | l | T-slot size | b | l | |
mm | mm | mm | mm | mm | mm | |
MDKUVE15..-3ZR | 5 | 12 | 25 | 8 | 16 | 25 |
MDKUVE15..-3ZR | 8 | 16 | ||||
MDKUVE25..-3ZR | 8 | 16 | 25 | 10 | 18,5 | 35 |
MDKUSE25..-3ZR | ||||||
MDKUVE35..-3ZR | 10 | 18,5 | 35 | 10 | 18,5 | 35 |
Connectors for switching tags
Switching tags can be screw mounted to the carriage unit in order to activate switches in the adjacent construction. The position and size are dependent on the size, ➤ Figure and table.
Connectors for switching tags on the carriage unit
Mounting dimensions for switching tags
Series | Mounting dimensions | ||||
|---|---|---|---|---|---|
Actuator | Jl58 | l58 | h58 | G58 | t58 max |
mm | mm | mm | mm | mm | |
MDKUVE15-240-3ZR | 40 | 10 | 23,3 | M5 | 12 |
MDKUVE15-500-3ZR | |||||
MDKUVE25-365-3ZR | 40 | 10 | 29 | M5 | 12 |
MDKUVE25-500-3ZR | |||||
MDKUSE25-365-3ZR | 40 | 10 | 29 | M5 | 12 |
MDKUSE25-500-3ZR | |||||
MDKUVE35-500-3ZR** | ‒ | ‒ | 28 | ‒ | ‒ |
**Carriage unit with T-slots on both sides.
Accuracy
Length tolerances
The information on the length tolerance of tandem actuators matches the information on the length tolerance of linear actuators.
Straightness of support rail
The information on the straightness of the support rails of tandem actuators matches the information on the straightness of the support rails of linear actuators.
Values for the straightness tolerances of support rails of tandem actuators, see table.
Tolerances
Length L2 | MDKUVE15..-3ZR | MDKUSE25..-3ZR MDKUVE25..-3ZR | MDKUVE35..-3ZR | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
t2 | t3 | Torsion | t2 | t3 | Torsion | t2 | t3 | Torsion | ||||
mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | |||
L2 ≦ | 1 000 | 0,6 | 0,5 | 0,5 | 0,8 | 0,7 | 0,5 | 0,8 | 0,7 | 0,8 | ||
1 000 | ＜ | L2 ≦ | 2 000 | 1 | 0,7 | 1 | 1,2 | 0,9 | 1 | 1,6 | 1,4 | 1,2 |
2 000 | ＜ | L2 ≦ | 3 000 | 1,4 | 0,9 | 1,5 | 1,6 | 1,1 | 1,5 | 2,4 | 2,1 | 2 |
3 000 | ＜ | L2 ≦ | 4 000 | 1,7 | 1,2 | 2 | 1,9 | 1,4 | 2 | 3,2 | 2,8 | 2,4 |
4 000 | ＜ | L2 ≦ | 5 000 | 2,1 | 1,4 | 2,5 | 2,3 | 1,6 | 2,5 | 4 | 3,5 | 2,8 |
5 000 | ＜ | L2 ≦ | 6 000 | 2,7 | 1,7 | 3 | 2,9 | 1,9 | 3 | 4,8 | 4,2 | 3,3 |
6 000 | ＜ | L2 ≦ | 7 000 | 3,1 | 2 | 3,5 | 3,3 | 2,2 | 3,5 | ‒ | ‒ | ‒ |
7 000 | ＜ | L2 | 3,6 | 2,3 | 4 | 3,8 | 2,5 | 4 | ‒ | ‒ | ‒ | |
➤ Figure shows the method for determining the straightness of the support rail.
Measurement method for straightness tolerances
Clamping actuator with toothed belt drive
Features
Actuators MKKUSE..-ZR are designed for special applications and correspond in their basic design and technical characteristics to the actuators MKUSE..-ZR. Clamping actuators have two carriage units moving in synchronised opposing directions.
With the exception of the special designs, the information on the features of clamping actuators matches the information on the features of linear actuators.
Special design
Special designs are available by agreement. Examples of these are clamping actuators:
- with reinforced or antistatic toothed belt or toothed belt of high temperature design
- with an extended carriage unit
- with a drive stud of special dimensions
- with T-strips inserted in the T-slots
- with special machining.
Drive
The actuators are available without a drive shaft as well as with a drive shaft on the left side, right side or passing through the unit (above, below), see table.
Possible combinations and drive variants, see also ➤ Figure.
Suffixes
Drive variants | Suffix |
|---|---|
Drive shaft above | AO |
Drive shaft below | AU |
No drive shaft | OZ |
Drive shaft on both sides (above and below) | OU |
Drive variants – clamping actuators
MKKUSE20-155-ZR
Mechanical accessories
A large number of accessories are available for clamping actuators with monorail guidance system and toothed belt drive. The allocation of accessories is valid if the data match the Technical principles and the Design and safety guidelines, link.
Allocation
Linear actuator / size | MKKUSE..-ZR | 20 | |
|---|---|---|---|
Fixing brackets | |||
WKL-65×65×30-N | | ||
WKL-65×65×35-N | | ||
WKL-90×90×35-N | | ||
Clamping lugs | |||
| SPPR-24×20 | | |
T-nuts | |||
MU-DIN 508 M6×8 | | ||
MU-M6×8 | | ||
T-nuts made from corrosion-resistant steel | |||
MU-DIN 508 M6×8-RB | | ||
T-bolts | |||
SHR-DIN 787 M8×8×32 | | ||
Rotatable T-nuts | |||
MU-M4×8-RHOMBUS | | ||
MU-M6×8-RHOMBUS | | ||
Positionable T-nuts | |||
MU-M6×8-POS | | ||
MU-M8×8-POS | | ||
Hexagon nuts | |||
| MU-ISO 4032 M8 | | |
T-strips | |||
LEIS-M6/8-T-NUT-SB-ST | | ||
LEIS-M8/8-T-NUT-SB-ST | | ||
LEIS-M6/8-T-NUT-HR-ST | | ||
LEIS-M6/8-T-NUT-HR-ALU | | ||
Connector sets (parallel connectors) | |||
VBS-PVB8 | | ||
Slot closing strips | |||
NAD-8×4,5 | | ||
NAD-8×11,5 | | ||
| Suitable. |
Design and safety guidelines
The following pages describe exclusively the differences between the clamping actuators and the linear actuators.
Idling drive torque
The idling drive torque M0 of clamping actuators is calculated for a constant velocity and for a horizontal (M0h) or vertical (M0v) mounting position, starting ➤ Figure. The idling drive torque increases with increasing travel velocity. The data in the diagrams are maximum values.
Idling drive torque
Horizontal mounting position
Idling drive torque
Vertical mounting position
Length calculation of clamping actuators
The length calculation of clamping actuators is based on the required effective stroke length NH. The effective stroke length NH is the minimum necessary stroke length of a carriage unit. The effective stroke length NH must be increased by the addition of safety spacing values on both sides of the travel distance.
The total length Ltot of the clamping actuator is determined from the support rail length L2, the lengths of the return units L4 and the minimum spacing between the carriage units Lk.
Parameters for length calculation
| GH | mm | Total stroke length |
| NH | mm | Effective stroke length |
| S | mm | Safety spacing, for minimum values see table |
| L | mm | Length of carriage plate |
| L2 | mm | Length of support rail |
| L4 | mm | Length of return unit |
| Ltot | mm | Total length of actuator |
| Lk | mm | Minimum spacing between the carriage units when moved together. |
Total stroke length GH
The total stroke length GH is determined from the two required effective stroke lengths and the safety spacings, which must be at least 85 mm.
Support rails
Clamping actuators are only available with a single-piece support rail. The maximum length of a support rail is 4 000 mm.
Minimim spacing Lk between carriage units
The minimum spacing Lk between the carriage units when moved together is 20 mm.
Total length Ltot and support rail length L2
The following ➤ equtions are designed for the clamping actuator. The parameters and their position can be found in ➤ Figure and the table.
Length parameters
Two carriage units
Total length
Length parameters
Designation | L | L4 | S |
|---|---|---|---|
mm | mm | mm | |
MKKUSE20-155-ZR-N | 155 | 80 | 85 |
Mass calculation
The total mass of a clamping actuator is calculated from the mass of the actuator without carriage units and the two carriage units. Insert the values from the table in the following ➤ equation. The values mLAW and mBOL are mandatory.
Basic design
Values for mass calculation
Designation | Mass | |
|---|---|---|
Carriage unit | Actuator without carriage unit | |
mLAW | mBOL | |
≈kg | ≈kg | |
MKKUSE20-155-ZR-N | 2,6** | (Ltot – 160)×0,010 3 + 1,56 |
**Two carriage units.
Lubrication
The information on the lubrication of clamping actuators matches the information on the lubrication of linear actuators. The only differences are in the information on relubrication quantities and relubrication points, see table.
Relubrication quantities
Relubrication should be carried out wherever possible with several partial quantities at various times instead of the complete quantity at the time of the relubrication interval. Relubrication quantities, see table.
Grease quantities
Clamping actuator | Relubrication quantity per carriage unit, |
|---|---|
≈g | |
MKKUSE20-155-ZR | 5 to 6 |
Relubrication points
The carriage units have funnel type lubrication nipples according to DIN 3405-A M6 on the right or left longitudinal side of each carriage unit. Furthermore, they can be relubricated, ➤ Figure, ➤ Figure and ➤ Figure.
Lubrication points
Lubrication ducts in the carriage unit
ATTENTION
During lubrication of actuators, all lubrication points on one longitudinal side of both carriage units must always be provided with lubricant.
Position of lubrication points
T-slots
The T-slots in the support rail are designed for T-bolts according to DIN 787 and T-nuts according to DIN 508, ➤ Figure. T-nuts and T‑bolts are inserted using filling slots in the support rail.
Sizes of T-slots in support rail and carriage unit
Filling openings
The filling openings are located on three sides of the clamping actuator: on both sides and underneath, ➤ Figure.
Filling opening in support rail
Connectors for switching tags
Connectors for switching tags on the carriage unit
Accuracy
Length tolerances
The information on the length tolerance of the clamping actuator matches the information on the length tolerance of linear actuators.
Straightness of support rails
The information on the straightness of the support rail of the clamping actuator matches the information on the straightness of the support rails of linear actuators.
Values for the straightness tolerances of support rails of clamping actuators, see table.
Tolerances
Length L2 of support rail | MKKUSE20..-ZR | |||||
|---|---|---|---|---|---|---|
t2 | t3 | Torsion | ||||
mm | mm | mm | mm | |||
L2 ≦ | 1 000 | 0,4 | 0,3 | 0,8 | ||
1 000 | ＜ | L2 ≦ | 2 000 | 0,8 | 0,5 | 1 |
2 000 | ＜ | L2 ≦ | 3 000 | 1,2 | 0,7 | 1,2 |
3 000 | ＜ | L2 ≦ | 4 000 | 1,5 | 1 | 1,6 |