Артикул: RX8636
BSHP Ball Runner Block FNN, standard, steel, without ball chain R1693 … 1.
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Description
- Area of application: For restricted upward space
- Maximum precision
- Patented entry zone increases the travel accuracy up to a factor of six
- Significantly reduced frictional oscillations and low friction level, particularly under external load
- Long-term lubrication is possible over several years
Features
- Lube fittings with metal threads on all sides
- End-face fastening thread for all attachments
- Integrated all-around sealing
- High torque capacity
- Preload classes: C0 (without preload, clearance) and C1 (moderate preload)
- Optional integrated, inductive and wear-free measuring system
- Optimized entry-zone geometry and high number of balls minimize variation in elastic deflection
- Can be used on all SNS/SNO Ball Guide Rails
- Attachments on the Ball Runner Block can be mounted from above and below
Product description
Product description of Ball Rail Systems
Production description – Ball Runner Block
Materials
Selection of a linear guide acc. to DIN 637
Ball chain and seals
Design and version
Friction
Due to the Rexroth design with four rows of balls, 2-point contact is available in all loading directions. This reduces the friction to a minimum.
Other ball rail systems with two or four rows of balls with 4-point contact have multiple friction: due to the differential slip with lateral loading and in case of comparable prestressing without the load, the gothic raceway profile causes higher friction (depending on the raceway curvature and the load, up to five times the friction coefficient). This high friction leads correspondingly to greater heat.
Seals
Seals are use to prevent dirt, chips and coolants, etc. from working their way into the inside of he Ball Runner Block, thereby preventing reductions to its service life. For further information, see "Selection criteria/seals".
Standard seal (SS)
Universal seals are fitted as standard in Rexroth Ball Runner Blocks. They have a uniform sealing effect for Ball Guide Rails with and without cover strips. Low friction and a good sealing effect have both been taken into account in the design. For applications where effective sealing is required.
Low-friction seal (LS)
For special requirements with regard to ease of movement.
Double-lip seal (DS)
For increased exposure to media
Front seal
For applications in environments with fine dirt or metal particles, as well as coolants or cutting fluids.
Interchangeable during servicing.
Front seals are available as accessories for mounting by the customer.
FKM seal
For applications in extreme environments with fine dirt or metal particles, as well as heavy use of coolants or cutting fluids.
Interchangeable during servicing.
FKM front seals are available as accessories for mounting by the customer.
Cover plate wiper
For use in environments with coarse dirt or chips.
Cover plate wiper are available as accessories for mounting by the customer.
Technical data
Load capacities and load moments
| Size | 20 | 25 1) | ||
| C | N |  | 14500 | 28600 |
| C0 | N | 24400 | 35900 | |
| Mt | Nm |  | 190 | 410 |
| Mt0 | Nm | 310 | 510 | |
| ML | Nm |  | 100 | 290 |
| ML0 | Nm | 165 | 360 | |
| 1) | BSHP Ball Runner Block |
| The calculation of the dynamic load ratings and load moments is based on a stroke length of 100,000 m as per DIN ISO 14728-1. However, often only 50,000 m is actually stipulated. For comparison: Multiply the values C,Mt and ML from the table by 1.26. |
General technical data
| Size | 20 | 25 1) | |
| amax 2) | m/s² | 250 | |
| vmax | m/s | 3 | |
| m | kg | 0.4 | 0.6 |
| μ 3) | 02 ... 03 | ||
| Material | CS | ||
| Operating conditions | |||
| Size | 20 | 25 1) | |
| Permissible ambient temperature (min ... max) 4) | -10 °C ... +80 °C | ||
| 1) | BSHP Ball Runner Block |
| 2) | If Fcomb > 2.8 • Fpr : amax = 50 m/s2 |
| 3) | Without friction of seal |
| 4) | Up to 100 °C permissible for short periods. For operation at negative temperatures, please consult us. |
Legend
| Symbol | Description | Unit |
| amax | Maximum acceleration travel | m/s2 |
| C | Dynamic load capacity | N |
| C0 | Static load capacity | N |
| m | Mass | kg |
| ML | Dynamic longitudinal moment load capacity | Nm |
| ML0 | Static longitudinal moment load capacity | Nm |
| Mt | Dynamic torsional moment load capacity | Nm |
| Mt0 | Static torsional moment laod capacity | Nm |
| vmax | Maximum permissible speed | m/s |
| μ | Friction coefficient |
General Notes
The general technical data and calculations apply to all Ball Rail Systems i.e. to all Ball Runner Blocks and Ball Guide Rails. Specific technical data relating to the individual Ball Runner Blocks and Ball Guide Rails is listed separately.
Preload classes
To cover the widest possible range of applications, Rexroth Ball Runner Blocks are available in different preload classes.
The following preload classes are available:
- Ball Runner Block without preload (preload class C0)
- Ball Runner Blocks with moderate preload (preload class C1)
- Ball Runner Blocks with average preload (preload class C2)
- Ball Runner Blocks with high preload (preload class C3)
To prevent reductions to the service life, the preload should not exceed 1/3 of the load on bearing F.
In general, the rigidity of the Ball Runner Block rises with increasing preload. If vibrations occur, select a correspondingly high preload (≥ preload class C2).
Guide systems with parallel rails
When choosing the preload class, pay attention to permissible parallelism offset of rails too ("Accuracy class selection criterion").
When specifying ball rail systems of accuracy class N, we recommend preload class C0 or C1 to avoid distortive stress due to the tolerances.
Accuracy classes
System preload
Dimensions
| a) | For O-ring |
| Size 20 - 25: Ø 5 · 1.0 (mm) | |
| Open lube port if necessary (see general technical notes and information in the "Maintenance" section). | |
| b) | Lube nipple, size 20 - 25: |
| Funnel-type lube nipple DIN 3405-B M3x5, B2 = 8 mm | |
| Lube port with additional anti-twist feature. | |
| When using different lube nipples, pay attention to the screw-in depth of 5 mm! | |
| The lube nipple is included in the scope of delivery (not installed). | |
| Size 20: Connection is possible on end-face. | |
| Size 25: Connection is possible on all sides. |
Dimensions
| Size | 20 | 25 1) | |
| A | mm | 59 | 73 |
| A1 | mm | 29.5 | 36.5 |
| A2 | mm | 20 | 23 |
| A3 | mm | 19.5 | 25 |
| B | 72.5 mm +0.5 | 81 mm +0.5 | |
| B1 | mm | 49.6 | 57.8 |
| E1 | mm | 49 | 60 |
| E2 | mm | 32 | 35 |
| E8 | mm | 30.5 | 38.3 |
| E9 | mm | 5.6 | 8.5 |
| H | mm | 28 | 33 |
| H1 | mm | 23 | 26.5 |
| Dimension H2 with cover strip | mm | 20.75 | 24.45 |
| Dimension H2 without cover strip | mm | 20.55 | 24.25 |
| K1 | mm | 13 | 16.6 |
| K2 | mm | - | 17 |
| K3 | mm | 3.6 | 4.1 |
| K4 | mm | - | 4.1 |
| N1 | mm | 7.7 | 9.3 |
| N6 | 13.2 mm ±0.5 | 15.2 mm ±0.5 | |
| S1 | mm | 5.3 | 6.7 |
| S2 | M6 | M8 | |
| ØS5 | mm | 6 | 7 |
| S9 | M3x5 | ||
| T | mm | 60 | |
| V1 | mm | 6 | 7.5 |
| 1) | BSHP Ball Runner Block |
Project planning information
Load on bearing for calculating the service life
Loads and service life
Mounting
General mounting instructions
Maintenance
Notes on lubrication
Certification
Directives and standards
Safety Instructions
Notes
Downloads
 | Profiled rail systems Manual | R320103885_EN | 2016-09-01 | English | PDF | 11.5MB Product Groups: Linear guides |
| Catalog BSHP Ball Rail Systems Catalog | R999000485 | 2020-10-01 | English | PDF | 15MB Product Groups: Ball Rail Systems only available as PDF |
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