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Description
- Linear Module with two Ball Rail Systems and tooth belt drive
- For high torque load capacity and high speeds
- Rigid aluminum profile frame with Rexroth ball rail system with cover strip
- High-performance toothed belt in the largest possible width for high drive torques with simultaneously high rigidity
- One-point lubrication feature of the Rexroth Ball Rail Systems from both sides (only suitable for grease lubrication with a manual grease gun)
Features
- Centering holes also in main body profile for simple combination with other linear motion systems and connection elements
- Standard with integrated solenoid switch for magnetic field sensors
- Extensive accessories for connection and clamping elements and connecting shafts
- Nameplate with parameters for easy start-up
- Economical maintenance thanks to the central relubrication option (grease lubrication or oil lubrication) from both sides via the carriage
- Aluminum carriages with T-grooves and centering holes
- Ball runner block with moderate preload (preload class C1)
- Realization of greater lengths of up to 6000 mm
Product description
Rexroth linear modules are precise, ready-to-mount guide systems that combine high-performance characteristics with compact dimensions. Rexroth provides a favorable price/performance ratio and fast delivery times.
Structural design
- Ready-to-install linear modules in any length up to Lmax
- Realization of greater lengths of up to 6000 mm
- Rigid aluminum profile frame with Rexroth ball rail system with cover strip
- Ball runner block with moderate preload (preload class C1)
- Aluminum carriages with T-grooves and centering holes
- Economical maintenance thanks to the central relubrication option (grease lubrication or oil lubrication) from both sides via the carriage
- High-performance toothed belt (AT profile) for high drive torques with simultaneously high rigidity
Attachments
- Planetary gearbox with various gear ratios
- Motor attachment kits according to customer specification
- Servomotor
- Magnetic field sensors for easy assembly
- Switch (proximity or mechanical) cable channel, socket-plug and extension cables in the accessories program
Attachments (range of accessory products)
- Clamping fixtures and sliding blocks
- Connecting shafts
- Connecting technology for linear motion systems
- Sensors and extension cables
Material pairing
ALST:
- Main body, carriage and end enclosures made of anodized aluminum (AL)
- MKR-065/-080/-110/-140/-145: ball rail and ball runner block made of rolling bearing steel (ST)
- MKR-040: Ball rail and ball runner block of rust and acid resistant material
- Grooved ball bearing of the drive mechanism (belt pulleys) made of rolling bearing steel
ALCR:
- Frame, carriage and end enclosures made of anodized aluminum (AL)
- MKR-065/-080/-110/-140/-145: Ball rail made of rolling bearing steel with corrosion resistant coating, matte-silver finish, hard chrome plated (Resist CR). ball runner block made of corrosion-resistant steel (Resist NR)
- MKR-040: Ball rail and ball runner block of rust and acid resistant material.
- Grooved ball bearing of the drive mechanism (belt pulleys) made of rolling bearing steel
LSS
lubrication versions: (Initial lubrication done at the factory)
- Initial standard greasing done at the factory, suitable for normal ambient conditions.
- Simple relubrication via manual grease gun.
- MKR-065/-080/-110/-140/-145: Grease lubricant Dynalub 510, NLGI grade 2 lithium-based high-performance grease according to DIN 51818 (KP2K-20 according to DIN 51825)
- MKR-040: Grease lubricant Dynalub 520, lithium-based high-performance grease of the NLGI grade 00 according to DIN 51818 (G00K-20 according to DIN 51826)
LPG: (Corrosion prevention, no initial lubrication)
- Linear module without initial greasing done at the factory.
- Ball rail system, only with corrosion prevention.
- Basic lubrication required
LCF: (prepared for connection to central lubrication systems with liquid grease)
- for liquid grease, NLGI grade 00 lithium-based high-performance grease according to DIN 51818 (GP00K-20 according to DIN 51826)
- Only use liquid grease lubrication with single-line total-loss lubrication systems via piston distributors.
- Basic lubrication required
LCO: (prepared for connection to central lubrication systems with oil)
- ball runner block with integrated non-return valves
- Only use oil lubrication with single-line total-loss lubrication systems via piston distributors.
- Basic lubrication required
Models
| 1) | Journal for motor attachment right or left |
| 2) | Journal for motor attachment on both sides |
| 3) | With gear reducer (motor mounting via clamping hub) |
Structure and attachments
Structural design
1 End head (drive side)
2 Ball rail systems
3 Toothed belt drive
4 Carriage
5 End head (clamping side)
6 Main body
Attachments:
7 Magnetic sensor
8 Cable channel
9 Switch bracket
10 Proximity switch
11 Mechanical switch
12 Socket/plug
Technical data
Maximum values for each size
| Cgw | N | 121190 |
| Mt | Nm | 7030 |
| ML | Nm | 17630 |
| Mx max | Nm | 2500 |
| My max | Nm | 6300 |
| Mz max | Nm | 7200 |
| Fy max | N | 49400 |
| Fz1 max | N | 49400 |
| Fz2 max | N | 43200 |
| Lmax | mm | 6000 |
| amax | m/s² | 50 |
| vmax | m/s | 5 |
| Maximum values depends on the selected configuration. |
Legend
| Symbol | Description | Unit |
| Cgw | Dynamic load capacity, linear guide | N |
| Mt | Dynamic torsional moment load capacity | Nm |
| ML | Dynamic longitudinal moment load capacity | Nm |
| Mx max | Maximum admissible torsional moment around the x-axis | Nm |
| My max | Maximum admissible torsional moment around the y-axis | Nm |
| Mz max | Maximum admissible torsional moment around the z-axis | Nm |
| Fy max | Maximum dynamic load in y-direction | N |
| Fz1 max | Maximum dynamic load in z-direction | N |
| Fz2 max | Maximum dynamic load in z-direction | N |
| Lmax | Maximum length | mm |
| amax | Maximum acceleration travel | m/s2 |
| vmax | Maximum permissible speed | m/s |
Mounting
Mounting
General information
The linear modules are mounted using various fastening elements:
- Clamping fixtures
- Sliding blocks for size -110 and up
- Square nuts
- Spring nuts
- Screws for T-slots as per DIN 787 (no picture).
Length depends on base.
When mounting Linear Modules, please note the maximum tightening torques listed in the table.
Fastening MKR-145-NN-3
| 1) | Mounting on frame for horizontal operation |
| 2) | Mounting on the carriage for vertical operation |
| Size | A | B | C |
| (mm) | (mm) | (mm) | |
| -040 | 52,2 | 65,5 | - |
| -065 | 81,0 | 95,0 | - |
| -080 | 96,0 | 110,0 | - |
| -110 | 132,0 | 150,0 | 85,0 |
| -140 | 167,0 | 193,0 | 105,0 |
| -145 | 172,0 | 198,0 | 78,0 |
| -165 | 192,0 | 218,0 | 120,0 |
Do not support the linear module on end enclosures, end blocks or on end plates!
The frame is the load-bearing part!
Tightening torques of fastening screws
with friction factor 0.125 strength class 8.8
 | 8.8 | M4 | M5 | M6 | M8 | M10 | M12 |
 | (Nm) | 2,7 | 5,5 | 9,5 | 23 | 46 | 80 |
Overview of the switching system
1 Socket and plug
2 Mechanical switch with attachments
3 Proximity switch
4 Switch bracket
5 Mounting channel / cable channel
6 Magnetic field sensor with fixed potted cable
(Reed/Hall sensor (for mounting channel))
7 Reed/Hall sensor with plug and sensor holder
7a: Magnetic sensor
7b: Sensor holder incl. set screws (loose) and square nut
7c: Cable holder (3 pcs) incl. set screw (loose)
7d: M8x1 plug (3-pin)
8 Magnetic switch with M8x1 plug
9 Clamping screw
10 Sliding block
Switch connection MKR-145-NN-3
Magnetic sensor with M8x1 plug
The switch activator is a magnet (on both sides) that is integrated in the carriage (no switch bracket necessary). The switch activation points can be positioned anywhere along the stroke. For position solenoid switch, see the linear module instructions R320103169.
Mounting instructions:
Slide sensor holder (a) into the sensor slot (S), position approximately and fix with two set screws (b).
Then install the magnetic sensor (8) in the sensor holder and fix by turning the clamping screw (9).
Proximity sensors, mechanical switches and accessories (MKK/MKR/MLR)
Mounting instructions:
The mechanical switches, the proximity sensors and the socket with plug and cable channel are fastened with attachments in T-grooves of the main body. Switch activation is carried out by a switch bracket on the carriage.
| Position | Name | Size -065/-080/-140 /-145-NN-3 | -110-NN-3 | -165-NN-2 |
| Material number | ||||
| 1 | Socket-plug | R117500153 | ||
| 2 | Mechanical switch | see accessories | ||
| Mechanical switch with attachments | R117500151 | |||
| 3 | Proximity sensor | see accessories | ||
| - Attachment parts without sensor | R117500152 | R117520152 | R117500152 | |
| 4 | Switching angle | R117500149 | R117500150 | |
| 5 | Cable duct | R039662017 | ||
| These switching versions can only be ordered with these material numbers. |
| Proximity sensor with additional attachment for | Proximity sensor with additional attachment for | Mechanical switch with attachment for |
 |  |  |
| 1) | Cable length: 3 m |
Socket and plug, cable duct
Attach the socket to the side with the most switches. The socket and plug are not pre-wired. The variable sliding attachment allows switching positions to be optimized during start-up. The plug can be mounted in three directions.
Cable duct
The cable duct is fastened in the T-slots on the side of the frame. Fastening screws widen the profile and ensure that the cable duct is securely mounted.
See the illustration for the position of the slot.
The cable duct will accommodate up to two cables for mechanical switches and three cables for proximity switches.
Fastening screws and cable grommets are included.
Mounting examples of switches
Determination of the switching position
Switching distance: The switching distance is the distance between the carriage center (TM) and the zero point (0) when a switch is actuated (indicated in mm). Example of a mechanical limit switch (assuming the zero point is at L/2):
Maximum switching distance = 0.5 x (max. travel distance) – excess travel = 0.5 x effective stroke
For safe operation of the linear module the excess travel must be greater than the braking path.
For MKR... and MLR...: The acceleration travel sa can be assumed as the reference value for the braking distance.
For MKK...: In most cases, the following is sufficient as a guideline value for the excess travel (braking path): Excess travel = 2 x screw lead P.
Note the smallest possible switching distance (determined by attachments):
mechanical-mechanical = 60 mm; mechanical-proximity = 45 mm; proximity-proximity = 28 mm.
for MKR-145: mechanical-mechanical = 62 mm; mechanical-proximity = 49 mm; proximity-proximity = 35 mm
The switches as well as socket with plug are fixed in the upper T-slots of the frame and actuated by a switch tab on the carriage.
Mounting side of the switches:
| 1) | links (L) |
| 2) | right (R) |
| 3) | Direction of travel |
| 4) | 0.5 x stroke |
| 5) | Excess travel |
| 6) | 0.5 x max. travel path |
Switch connection
S = Slot for sensor holder MKR-145-NN-3
| 1) | Mechanical and proximity switch |
| 2) | Magnetic sensor |
Accessories
Clamping fixtures for Linear Modules
Clamping fixtures for Linear Modules
Sliding blocks and springs for Linear Modules
Sliding blocks and springs for Linear Modules
Anchor strips for Linear Modules
Anchor strips for Linear Modules
Centering rings for Linear Modules
Centering rings for Linear Modules
Square nuts for Linear Modules
Square nuts for Linear Modules
Cable duct
Cable duct
Frequency meter
Frequency meter
Proximity sensor with free line end
Proximity sensor with free line end
Proximity sensor with M8x1 plug
Proximity sensor with M8x1 plug
Additional components for inductive sensor
Additional components for inductive sensor
Mechanical switch
Mechanical switch
Mechanical switch with M8x1 plug
Mechanical switch with M8x1 plug
Additional components for mechanical switch
Additional components for mechanical switch
Adapter
Adapter
Socket and plug
R117500153
Socket and plug
R117500153
Switching angle
Switching angle
Nozzle pipe
R3455 031 06
Nozzle pipe
R3455 031 06
- For manual grease guns
- For the lubrication of funnel-type and ball-type lube nipples
Safety Instructions
Required and supplementary documentation
For further instructions and information, please refer to the documentation for this product.
You can find PDF files of these documents on the Internet at www.boschrexroth.com/mediadirectory.
We would also be happy to send you the documents that you want.
If you are unsure about using this product, please contact Bosch Rexroth.
Ordering codes
Explanation of short product name
| Linear Module MKR-145 example | MKR-145-NN-3 | |
| System | M = | Linearmodule |
| Linear guide | K = | Ball Rail System |
| Drive | R = | Toothed belt drive |
| Size | 145= | 145 |
| Version | NN = | Normal version |
| Generation | 3 = | Product generation 3 |
Order overview
| Part number | Short product name | CAD data | Buy |
| R114620013 | MKR-145-NN-3 |
Downloads
 | Declaration of Incorporation for single axis Linear Motion Systems Certificate | R320103141 | 2020-06-01 | All languages | PDF | 409k Product Groups: Linear axes and electromechanical cylinders |
| Safety Instructions for Linear Motion Systems Manual | R320103152_en | 2015-01-01 | English | PDF | 593k Product Groups: Linear axes and electromechanical cylinders |
| Linear Modules MKK/MKR/MLR -040/-065/-080/-110/-140/-145-NN-3/-165-NN-2 Manual | R320103169_EN | 2021-11-01 | English | PDF | 6.9MB Product Groups: Linear Modules only available as PDF |
| Linear Modules MKK / MKR / MLR Catalog | R999000496 | 2021-03-01 | English | PDF | 17.5MB Product Groups: Linear Modules |
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