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Description
Features
- When attached to both sides, it also meets the lubrication needs of high-capacity two-start nuts (FED-E-B).
- Can be used in all normal ambient conditions, except in wet or dusty environments.
Product description
Ball screw assembly with front lube unit
Characteristic features
Equipped with Rexroth’s functionally reliable, series-made front lube unit, a ball screw assembly can attain an exceptionally long travel life without relubrication. Thanks to intensive development work and thorough testing under realistic conditions, the use of front lube units combined with prelubricated nuts enables you to achieve lifelong, optimal lubrication of Rexroth precision ball screw assemblies.
From its built-in oil reservoir, the front lube unit delivers the precise amount of oil required to replenish the used amounts of oil in the soap matrix of the grease. The oil is applied directly to the raceway of the ball screws via the low-friction point-contact zone of the open-pored foam. This optimized delivery minimizes lubricant consumption and allows you to achieve lifelong lubrication.
Ecologically sound
The front lube unit ideally combines eco-friendliness with cost-efficiency. It minimizes oil consumption and keeps the surroundings clean. This protects the environment.
Lubrication concept
This logo indicates that the Rexroth ball screw assembly with prelubed nut and front lube unit are lubed for life.
Note: The front lube unit is not suitable for use with driven nuts.
Lifelong lubrication
The effective life of the Rexroth front lube unit matches the service life curve of the ball screw assembly. When operated within the recommended load limits, a ball screw assembly equipped with a front lube Unit will require no relubrication, thanks to the optimal delivery of lubricant. Based on our extensive tests, the lubrication performance of the front lube unit can now be reliably predicted for the first time. With the front lube unit form Rexroth, a ball screw assembly will operate safely for five years long or for 300 million revolutions without relubrication.
Structural design of front lube units
1) Seal
2) Housing and cover – material: special plastic
3) Open-pored foam
4) Ring nut
5) Intermediate ring
6) Recirculation cap
7) Ball nut
8) Ball screw
Contact zone of the open-pored foam
Front lube unit
The front lube unit (VSE) has been designed for the long-term, maintenance-free operation of the ball screw assembly. It is attached to the nut and delivers lube oil continuously to the rolling elements. For travel up to 300 million revolutions without relubrication.
The front lube unit can be combined with the following nut types:
- FEM-E-S
- FEM-E-C
- SEM-E-C
- FED-E-B
- FDM-E-S
- FDM-E-C
Lifelong lubrication
Results confirmed by our extensive tests:
1) Life-time lubrication: For axial loads of 15-35% of the dynamic load rating C, the nut is lubed for life.
2) Maintenance-free up to 300 x 106 revolutions: For axial loads of < 15% of the dynamic load rating C, the ball screw assembly requires no maintenance for up to 300 million revolutions.
3) Relubrication required: After 300 million revolutions, the nut should be relubricated as usual. The front lube unit does not have to be removed from the nut.
a) Normal operating load
n = revolutions
%C = relative load
| Lead (mm) | Travel distance s with front lube units1) (km) |
| 5 | 1 500 |
| 10 | 3 000 |
| 20 | 6 000 |
| 32 | 9 600 |
| 40 | 12 000 |
| 1) max. load up to 0.15C | |
Dimensions
| 1) | Ball screw drive with front lube unit |
| 2) | Front lube unit |
Dimensions and technical data
| Size | D | L | Mass |
| d0 x P | mm | mm | kg |
| 20x5/20R | 32.6 | 51 | 0.021 |
| 25x10/25R | 37.5 | 0.027 | |
| 32x5/10/20/32R | 47.5 | 0.042 | |
| 40x5R | 55.5 | 53 | 0.055 |
| 40x10/20/40R | 62.3 | 51 | 0.07 |
Legend
| Symbol | Description |
| d0 | Nominal diameter |
| P | Lead (R = right-hand) |
Project planning information
When selecting the size for the stroke, consider the dimensions of the VSE. When setting up a system, do not allow the VSE to collide with a stop or other components.
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.
If you are unsure about using this product, please contact Bosch Rexroth.
Ordering codes
The Front Lube Unit is delivered ready-mounted to the Ball Screw Assembly.
Only installation by the manufacturer is permitted.
Please use the configurator to order a Ball Screw Assembly with a Front Lube Unit.
Material numbers
| Size | Part number |
| d0 x P | |
| 20x5/20R | R151715000 |
| 25x10/25R | R151725010 |
| 32x5/10/20/32R | R151735020 |
| 40x5R | R151745030 |
| 40x10/20/40R | R151745040 |
Legend
| Symbol | Description |
| d0 | Nominal diameter |
| P | Lead (R = right-hand) |
Mounting orientation of the front lube unit on nut types
| Nut type | Mounting orientation |
| FEM-E-S | 2, 3 |
| FEM-E-C | 2, 3 |
| SEM-E-S | 2, 3 |
| SEM-E-C | 2, 3 |
| FED-E-B | 4 |
| FDM-E-S | 2, 3 |
| FDM-E-C | 2, 3 |
Ordering example for front lube unit with illustration of mounting orientation
| BASA | 32 x 10R x 3,969 | FEM-E-S - 5 | 00 | 1 | 3 | T7 | R | 81K203 | 31K200 | 1000 | 0 | 2 |
Front lube unit on left, nut with initial greasing
| 1) | Front lube unit (VSE) |
| 2) | Nut unit |
| 3) | Centering diameter D1 |
| BASA | 32 x 10R x 3,969 | FSZ-E-S - 5 | 00 | 1 | 3 | T7 | R | 81K203 | 31K200 | 1000 | 0 | 3 |
Front lube unit on right, nut with initial greasing
| 1) | Nut unit |
| 2) | Centering diameter D1 |
| 3) | Front lube unit (VSE) |
| BASA | 40 x 20R x 6 | FED-E-B - 8 | 00 | 1 | 3 | T7 | R | 81K250 | 31K300 | 1000 | 0 | 4 |
Front lube unit on two sides, nut with initial greasing
| 1) | Front lube unit (VSE) |
| 2) | Nut unit |
| 3) | Centering diameter D1 |
Downloads
 | Catalog screw assemblies Catalog | R999001185 | 2021-04-01 | English | PDF | 30.7MB Product Groups: Ball Screw Assemblies, Planetary Screw Assemblies Only available as PDF - Ball screw assemblies BASA/Planetary screw assemblies PLSA |
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