Actuators with external track roller guidance system
Features
Linear actuators MLF..-ZR comprise:
- a carriage available in various lengths
- an external track roller guidance system
- a support rail unit with external running shafts for the carriage
- a toothed belt drive
- two return units.
Designs
Linear actuators of series MLF..-ZR 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 | Basic design |
GTRI | Integrated planetary gearbox | Standard |
FA517 | Multi-piece support rail | Standard |
RB | Corrosion-resistant design | Standard |
W2 | Second, driven carriage | Standard |
WN2 | Second, non-driven carriage | Standard |
FBALG | Bellows | Standard |
Special designs
Special designs are available by agreement. Examples of these are linear actuators:
- with more than two driven carriages
- with more than one non-driven carriage
- with additional, non-driven carriage of different length or wide carriage
- with several driven and non-driven carriages (of different length or wide carriage)
- with reinforced or antistatic toothed belt or toothed belt of high temperature design
- with T-strips inserted in the T-slots
- with bellows resistant to welding beads
- with a compressed air connection in the return units
- with a drive stud of special dimensions
- with special machining.
Carriage
The carriage has a saddle plate made from anodised profiled aluminium, four bolts, four profiled track rollers and a plastic lubrication and wiper unit on each end face.
The carriage is set clearance-free by means of two eccentric bolts. The carriage contains integral tensioners on both sides for the toothed belt. Available carriage lengths as a function of actuator sizes, see table and ➤ Figure.
Lengths of carriages
Series | Carriage length | Suffix |
|---|---|---|
mm | ||
MLF32..-ZR | 155 | 155 |
300 | 300 | |
MLF52..-ZR | 200 | 200 |
245 | 245 | |
260 | 260 | |
300 | 300 | |
500 | 500 |
Carriage
Longer carriage or second carriage
The carriages of linear actuators are available in various lengths. Longer carriages allow support of higher moment loads.
Optionally, a second driven or non-driven carriage can be fitted. The non-driven carriage has a feedthrough for the toothed belt and can thus be moved freely. It is connected to the other carriage by means of the adjacent construction.
Movable or stationary carriage
A movable carriage is mounted and used as follows, ➤ Figure:
- where a long stroke length or total length is required
- predominantly for horizontal mounting.
A stationary carriage is mounted and used as follows:
- where a short stroke length required
- predominantly for vertical mounting.
Movable or stationary carriage
Lubrication
The carriage has two lubrication nipples in each end face. These are used to lubricate the guidance shafts of the support rail. The track rollers are greased and do not require lubrication.
Sealing
The carriage is sealed by means of lubrication and wiper units. The profiled track rollers have gap seal on both sides.
Location
The carriage has six threaded holes for fixing to the adjacent construction. Longer carriages have up to ten threaded holes.
Support rail unit
The support rail LFS..-M is a composite unit. It comprises a carrier profile made from anodised aluminium and rolled-in high precision running shafts ⌀ 6h6 or ⌀ 10h6 made from quenched and tempered steel to rolling bearing quality.
The running shafts are hardened and ground. 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 8 000 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 two laterally screw mounted and dowelled aluminium plates. The minimum length of a segment of a multi-piece support rail is 500 mm.
One return unit and the carriage are premounted on the first support rail segment. The other support rail segments with the screw mounted and dowelled aluminium plates, the second return unit and the toothed belt are supplied in addition and must be fitted by the customer, see link.
T-slots
The support rails have T-slots for standardised T-nuts. These are used in order to fix the actuators to the adjacent construction, see link.
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 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 in the carriage.
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 link.
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 (left and right) | RL |
Drive variants
on single-piece support rails ·
(carriage side with eccentric bolts) ·
Drive elements
For actuators, Schaeffler also offers 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
Mechanical accessories
A large number of accessories are available for linear actuators with external track roller guidance system. The allocation of accessories is valid if the data match the Technical principles and the Design and safety guidelines, link.
Allocation
Linear actuator | MLF..-ZR | ||
|---|---|---|---|
Size | 32 | 52 | |
Fixing brackets | |||
| WKL-48×48×35 | | |
WKL-65×65×35 | ‒ | | |
WKL-65×65×30-N | ‒ | | |
WKL-65×65×35-N | ‒ | | |
Clamping lugs | |||
| SPPR-28×30 | | |
T-nuts | |||
| MU-DIN 508 M6×8 | | |
MU-M4×8 | | | |
T-nut 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-M4×8-POS | | | |
MU-M5×8-POS | | | |
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 | | | |
LEIS-M6/8-T-NUT-ST | | | |
Connector sets (parallel connectors) | |||
VBS-PVB8 | | | |
VBS-PVB8/10 | | | |
Slot closing strips | |||
NAD-8×4,5 | | | |
NAD-8×11,5 | | | |
 | Suitable. |
 | Only for the lowest lateral T-slot in the support rail. |
 | Only with M5 screws, only in the lateral T-slots in the support rail. |
 | For T-slots in the support rail. |
 | T-strips must already have been inserted at the time of despatch. |
 | Swivel type T-strip. |
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 comprising carrier profile and guidance shafts
- support spacings up to 8 000 mm
- introduction of the load at the centre of the carriage 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 carriages since there will be different spacings between the carriages. 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 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
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. It is only if bellows are present that the effective length BL must be added.
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 carriages are present, both carriage lengths L 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 |
| 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 carriages |
| BL | mm | Effective length of bellows |
| FBL | Effective length factor. |
Total stroke length
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 guideways
The maximum length of single-piece support rails is 8 000 mm. Longer support rails are supplied in units comprising several segments. The maximum length of a multi-piece support rail is 24 000 mm. Multi-piece support rails: the minimum length of a support rail segment is 500 mm. A maximum of three support rail segments is permissible.
Spacing Lx1 between carriages
The minimum spacing Lx1 between two carriages is 50 mm if the second carriage is driven (W2). If the second carriage is non-driven (WN2), the minimum spacing Lx1 without bellows is 5 mm and with bellows it is 200 mm.
Total length Ltot and guideway length L2
The following ➤ equtions are designed for one and two carriages. The parameters and their position can be found in ➤ Figure and ➤ Figure as well as in the table. If more than two carriages are present, please consult us.
Length parameters for one carriage
One carriage without bellows
One carriage with bellows
Total length
Length parameters for two carriages
Two carriages without bellows
Two carriages with bellows
Total length
Length parameters
Designation | L | L4 | L6 | S | FBL |
|---|---|---|---|---|---|
mm | mm | mm | mm | ||
MLF32-155-ZR | 155 | 80 | 6 | 85 | 1,44 |
MLF32-300-ZR | 300 | ||||
MLF52-200-ZR | 200 | 115,5 | 6 | 85 | 1,37 |
MLF52-300-ZR | 300 | ||||
MLF52-245-E-ZR | 245 | 115,5 | 6 | 85 | 1,37 |
MLF52-500-E-ZR | 500 | ||||
MLF52-260-EE-ZR | 260 | 115,5 | 6 | 85 | 1,37 |
MLF52-500-EE-ZR | 500 |
Effective length of bellows
The effective length of bellows is the length occupied by the bellows in the fully compressed state. Calculation is based on the total stroke length GH, ➤ Figure, ➤ equation.
Effective length calculation
| BL | mm | Effective length of bellows |
| GH | mm | Total stroke length |
| FBL | – | Effective length factor, see table. |
ATTENTION
The maximum length L2 of support rails for actuators with bellows is 3 500 mm. Longer support rails with bellows are available by agreement.
Mass calculation
The total mass of an actuator is calculated from the mass of the actuator without a carriage, the carriage with the special design: multi‑piece guideway (FA517), integrated gearbox (GTRI) and second carriage (W2, WN2), ➤ 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 | Actuator without carriage | |
mLAW | mBOL | |
≈kg | ≈kg | |
MLF32-155-ZR | 0,73 | (Ltot – 160) · 0,0064 + 3,11 |
MLF32-300-ZR | 1,38 | |
MLF52-200-ZR | 2 | (Ltot – 231) · 0,0120 + 7,91 |
MLF52-300-ZR | 2,93 | |
MLF52-245-E-ZR | 3,4 | |
MLF52-500-E-ZR | 6,67 | |
MLF52-260-EE-ZR | 4,12 | |
MLF52-500-EE-ZR | 7,47 | |
Values for mass calculation
Designation | Mass | ||||
|---|---|---|---|---|---|
Design | |||||
m1 | m2 | m3 | |||
FA517.1 | FA517.2 | GTRI/4 | GTRI/8 | W2 (WN2) | |
≈kg | ≈kg | ≈kg | ≈kg | ≈kg | |
MLF32-155-ZR | 1,22 | 2,46 | ‒ | ‒ | 0,73 |
MLF32-300-ZR | 1,38 | ||||
MLF52-200-ZR | 1,84 | 3,68 | 0,7 | 0,35 | 2 |
MLF52-300-ZR | 2,93 | ||||
MLF52-245-E-ZR | 3,4 | ||||
MLF52-500-E-ZR | 6,67 | ||||
MLF52-260-EE-ZR | 4,12 | ||||
MLF52-500-EE-ZR | 7,47 | ||||
Lubrication
The guidance system in linear actuators must be lubricated during operation.
The profiled track rollers sealed on both sides by gap seals are greased with a high quality lithium soap grease and the track roller sizes used are classified as lubricated for life.
The bearing arrangement of the toothed belt return units is maintenance-free.
Lubrication of the guideway
The raceways are lubricated by means of lubrication and wiper units containing oil-soaked felt inserts. These inserts are supplied from the factory already soaked with oil (H1 authorisation for the food industry).
ATTENTION
The lubrication and wiper units are integrated in the MLF carriage and must be supplied with oil via lubrication nipples.
For relubrication of the guideway raceways, oils with a viscosity of 460 mm2/s are recommended.
Relubrication intervals
The relubrication intervals are essentially dependent on the following factors:
- the travel velocity of the carriage
- the load
- the operating temperature
- the stroke length
- the environmental conditions and environmental influences
- the mounting position.
Lubrication intervals
The lubrication intervals are dependent on the environmental influences. The cleaner the environment, the smaller the quantity of lubricant consumed. The time and quantity can only be determined precisely under operating conditions since it is not possible to determine all the influences by calculation. An observation period of adequate length must be allowed.
ATTENTION
Fretting corrosion is a consequence of lubricant starvation and is visible as a reddish discolouration of the opposing raceway or the outer ring of the track roller. 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 actuators are lubricated, the right and left lubrication point on each carriage must always be used. In order to ensure that a significant oil reserve is formed for dispensing oil to the raceways, all lubrication points on a carriage must always be used.
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 per lubrication nipple and per end face |
|---|---|
≈ ml | |
MLF32..-ZR | 1 to 2 |
MLF52..-ZR | 2 to 3 |
MLF52..-E-ZR | 2 to 3 |
MLF52..-EE-ZR | 2 to 3 |
Relubrication procedure
Relubrication should be carried out whilst the carriage is moving and warm from operation over a minimum stroke length corresponding to one carriage length.
During lubrication, it must be ensured that the grease gun, grease, lubrication nipple and the environment of the lubrication nipple are clean.
Lubrication nipples for relubrication
In the case of actuators, the running shafts are relubricated by means of oil-soaked felt lubrication inserts in the lubrication and wiper units fitted on both end faces of the compact carriage, which can be reoiled via drive fit lubrication nipples NIP A1, ➤ Figure.
Mounting situation of the drive fit lubrication nipple NIP A1
Relubrication points
The felt lubrication inserts in the lubrication and wiper units fitted are reoiled via drive fit lubrication nipples NIP A1. Lubrication can be carried out from both end faces of the carriage, see table and ➤ Figure. All MLF sizes contain lubrication and wiper units each with two lubrication nipples in order to allow coating of both running shafts.
Lubrication points
Position of relubrication points
Designation | Mounting dimensions | |||
|---|---|---|---|---|
Actuator | Clamping actuator | b56 | h56 | l56 |
mm | mm | mm | ||
MLF32..-ZR | MKLF32..-ZR | 72,2 | 20,5 | 1,5 |
MLF52..-ZR | MKLF52..-ZR | 105 | 29,2 | 1,5 |
MLF52..-E-ZR | MKLF52..-E-ZR | 90 | 35,3 | 1,5 |
MLF52..-EE-ZR | MKLF52..-EE-ZR | 90 | 35,3 | 1,5 |
T-slots
The 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.
Dimensions of T-slots
Filling openings
The filling openings are located on three sides of the linear actuator: on both sides and underneath, ➤ Figure.
Filling opening in support rail
Connectors for switching tags
Switching tags can be screw mounted to the carriage in order to activate switches. The position and size are dependent on the size, ➤ Figure and table.
Connectors for switching tags on the carriage
Mounting dimensions for switching tags
Actuator | Mounting dimensions (both sides) | |||
|---|---|---|---|---|
Lateral | ||||
JL58 | JL63 | l58 | h58 | |
mm | mm | mm | mm | |
M(K)LF32-155-ZR | 91 | 30 | 32 | 28,7 |
M(K)LF32-300-ZR | 74,5 | 151 | ||
M(K)LF52-200-ZR | 120 | ‒ | 40 | 41,1 |
M(K)LF52-300-ZR | 90 | |||
M(K)LF52-245-E-ZR | ‒ | ‒ | ‒ | ‒ |
M(K)LF52-500-E-ZR | ||||
M(K)LF52-260-EE-ZR | ‒ | ‒ | ‒ | ‒ |
M(K)LF52-500-EE-ZR | ||||
Mounting dimensions for switching tags
Actuator | Mounting dimensions (both sides) | ||||
|---|---|---|---|---|---|
■■■ | Underside | ||||
G58 G63 | t58 max t63 max | JL63 | b63 | l63 | |
mm | mm | mm | mm | mm | |
M(K)LF32-155-ZR | M3 | 10 | ‒ | ‒ | ‒ |
M(K)LF32-300-ZR | |||||
M(K)LF52-200-ZR | M3 | 10 | 30 | 3 | 85 |
M(K)LF52-300-ZR | 135 | ||||
M(K)LF52-245-E-ZR | M3 | 10 | 30 | 10,5 | 107,5 |
M(K)LF52-500-E-ZR | 235 | ||||
M(K)LF52-260-EE-ZR | M3 | 10 | 30 | 15,5 | 115 |
M(K)LF52-500-EE-ZR | 235 | ||||
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. Possible mounting arrangements are shown starting ➤ Figure.
In addition to the horizontal mounting with the carriage facing “upwards” described as “common”, these actuators are also suitable in many cases for a vertical mounting position.
Mounting of actuators with a carriage to one side or suspended overhead is only possible under certain circumstances in the case of a longer stroke length or total stroke length. In such cases, please consult the Schaeffler engineering service.
ATTENTION
The carriage 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.
Movable or stationary carriage
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 or carriages.
Actuators longer than 8 000 mm
Actuators longer than 8 000 mm are supplied as multi-piece units, ➤ Figure. 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. This include retaining plates, fixing screws, nuts and dowels.
Actuators longer than 8 000 mm, LT1 is always on the drive side
ATTENTION
Support rails in multi-piece actuators must be supported at their joints both during assembly and during operation.
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:
- travel velocity
- load
- temperature
- stroke length
- 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.
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 | |||
**Not possible for actuators MLF52..-ZR..-GTRI and MKLF..-ZR.
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 table.
Tolerances
Length L2 | MLF32..-ZR | MLF52..-ZR | |||||||
|---|---|---|---|---|---|---|---|---|---|
t2 | t3 | Torsion | t2 | t3 | Torsion | ||||
mm | mm | mm | mm | mm | mm | mm | |||
L2 ≦ | 1 000 | 0,5 | 0,2 | 0,3 | 0,4 | 0,2 | 0,3 | ||
1 000 | ＜ | L2 ≦ | 2 000 | 1 | 0,3 | 0,6 | 0,8 | 0,3 | 0,6 |
2 000 | ＜ | L2 ≦ | 3 000 | 1,5 | 0,4 | 0,9 | 1,2 | 0,4 | 0,9 |
3 000 | ＜ | L2 ≦ | 4 000 | 2 | 0,5 | 1,2 | 1,5 | 0,5 | 1,2 |
4 000 | ＜ | L2 ≦ | 5 000 | 2,5 | 0,6 | 1,5 | 1,9 | 0,6 | 1,5 |
5 000 | ＜ | L2 ≦ | 6 000 | 3 | 0,7 | 1,8 | 2,5 | 0,7 | 1,8 |
6 000 | ＜ | L2 ≦ | 7 000 | 3,5 | 0,8 | 2,1 | 2,9 | 1 | 2,1 |
7 000 | ＜ | L2 | 4 | 0,9 | 2,4 | 3,4 | 1,2 | 2,4 | |
➤ Figure shows the method for determining the straightness of the support rail.
Measurement method for straightness tolerances
Clamping actuators with external track roller guidance system
Features
Actuators MKLF..-ZR are designed for special applications and correspond in their basic design and technical characteristics to the actuators MLF..-ZR. While the carriages in the linear actuator always travel in the same direction, clamping actuators have two carriages 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.
Designs
Clamping actuators of series MKLF..-ZR 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 |
|---|---|---|
‒ | Two carriages moving in opposing directions | Basic design |
GTRI | Integrated planetary gearbox | Standard |
RB | Corrosion-resistant design | Special design |
Special designs
Special designs are available by agreement. Examples of these are clamping actuators:
- with an additional, non-driven carriage
- with an additional, non-driven carriage of different length and/or wide carriage
- with several driven and non-driven carriages (of different length and/or wide carriage)
- with reinforced or antistatic toothed belt or toothed belt of high temperature design
- with T-strips inserted in the T-slots of the support rail
- with bellows resistant to welding beads
- with extended carriages
- with a compressed air connection in the return units
- with a drive stud of special dimensions
- 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, see table. Possible combinations and drive variants, see also link.
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 (left and right) | RL |
Drive variants
(carriage side with eccentric bolts) ·
Mechanical accessories
A large number of accessories are available for clamping actuators with external track roller guidance system. The allocation of accessories is valid if the data match the Technical principles and the Design and safety guidelines, link.
Allocation
Linear actuator | MKLF..-ZR | ||
|---|---|---|---|
Size | 32 | 52 | |
Fixing brackets | |||
| WKL-48×48×35 | | |
WKL-65×65×35 | ‒ | | |
WKL-65×65×30-N | ‒ | | |
WKL-65×65×35-N | ‒ | | |
Clamping lugs | |||
| SPPR-28×30 | | |
T-nuts | |||
| MU-DIN 508 M6×8 | | |
MU-M4×8 | | | |
T-nut 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-M4×8-POS | | | |
MU-M5×8-POS | | | |
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 | | | |
LEIS-M6/8-T-NUT-ST | | | |
Connector sets (parallel connectors) | |||
VBS-PVB8 | | | |
VBS-PVB8/10 | | | |
Slot closing strips | |||
NAD-8×4,5 | | | |
NAD-8×11,5 | | | |
| Suitable. |
| Only for the lowest lateral T-slot in the support rail. |
| Only with M5 screws, only in the lateral T-slots in the support rail. |
| For T-slots in the support rail. |
| T-strips must already have been inserted at the time of despatch. |
| Swivel type T-strip. |
Design and safety guidelines
The following sections describe exclusively the differences between the clamping actuators MKLF and the linear actuators MLF.
Idling drive torque
The idling drive torque M0 of linear actuators is calculated for a constant velocity, 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 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. The two effective stroke lengths NH must be increased by the addition of safety spacing values on both sides.
The total length Ltotof the clamping actuator is determined from the support rail length L2, the lengths of the return units L4 and the minimum spacing between the carriages Lk.
Parameters for length calculation
| GH | mm | Total stroke length |
| NH | mm | Effective stroke length per carriage |
| S | mm | Safety spacing, for minimum values see table |
| L | mm | Length of carriage |
| L2 | mm | Length of support rail |
| L4 | mm | Length of return unit |
| L6 | mm | Length of wiper brushes |
| Ltot | mm | Total length of actuator |
| Lk | mm | Spacing between the carriages when moved together. |
Total stroke length
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 rails. The maximum length of a guideway is 8 000 mm.
Minimum spacing Lk between carriages
The minimum spacing Lk between the carriages when moved together is 20 mm.
Total length Ltot and support rail length L2
The following ➤ equations are designed for the clamping actuator. The parameters and their position can be found in ➤ Figure and table.
Length features of the actuator
Two carriages without bellows
Total length
Length parameters
Designation | L | L4 | L6 | S |
|---|---|---|---|---|
mm | mm | mm | mm | |
MKLF32-155-ZR | 155 | 80 | 6 | 85 |
MKLF32-300-ZR | 300 | |||
MKLF52-200-ZR | 200 | 115,5 | 6 | 85 |
MKLF52-300-ZR | 300 | |||
MKLF52-245-E-ZR | 245 | 115,5 | 6 | 85 |
MKLF52-500-E-ZR | 500 | |||
MKLF52-260-EE-ZR | 260 | 115,5 | 6 | 85 |
MKLF52-500-EE-ZR | 500 |
Mass calculation
The total mass of a clamping actuator is calculated from the mass of the actuator without a carriage, the carriage and the special design: integrated gearbox (GTRI). 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 | Actuator without carriage | |
mLAW | mBOL | |
≈kg | ≈kg | |
MKLF32-155-ZR | 1,8 | (Ltot – 160) · 0,0063 + 3,11 |
MKLF32-300-ZR | 3,17 | |
MKLF52-200-ZR | 4,82 | (Ltot – 231) · 0,0116 + 7,91 |
MKLF52-300-ZR | 6,9 | |
MKLF52-245-E-ZR | 7,69 | |
MKLF52-500-E-ZR | 14,34 | |
MKLF52-260-EE-ZR | 9,06 | |
MKLF52-500-EE-ZR | 15,86 | |
Values for mass calculation
Designation | Mass Design | |
|---|---|---|
m2 | ||
GTRI/4 | GTRI/8 | |
≈kg | ≈kg | |
MKLF32-155-ZR | ‒ | ‒ |
MKLF32-300-ZR | ‒ | ‒ |
MKLF52-200-ZR | 0,7 | 0,35 |
MKLF52-300-ZR | ||
MKLF52-245-E-ZR | ||
MKLF52-500-E-ZR | ||
MKLF52-260-EE-ZR | ||
MKLF52-500-EE-ZR | ||
Lubrication
The information on lubrication of clamping actuators MKLF matches the information on the lubrication of linear actuators MLF.
Grease quantities
Clamping actuator | Relubrication quantity per lubrication nipple and per end face |
|---|---|
≈ ml | |
MKLF32..-ZR | 1 to 2 |
MKLF52..-ZR | 2 to 3 |
MKLF52..-E-ZR | 2 to 3 |
MKLF52..-EE-ZR | 2 to 3 |
T-slots
The 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.
Dimensions of T-slots
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
Accuracy
The information on the accuracy of clamping actuators MKLF matches the information on the accuracy of linear actuators MLF.