BSHP Ball Runner Block SNH, standard, Resist CR, with ball chain R1621 … 7.

Description

• Area of application: For restricted space in transverse direction and high rigidity requirements
• Higher rigidity than SNS
• Maximum precision
• Significantly reduced frictional oscillations and low friction level, particularly under external load
• Ball Runner Block body or ball Guide Rail made of steel with corrosion-resistant coating, matt silver finish, hard chrome plated

Features

• Patented entry zone increases the travel accuracy up to a factor of six
• Long-term lubrication is possible over several years
• Excellent dynamic characteristics
• End-face fastening thread for all attachments
• Ball chain for low noise level and best travel behavior
• The same high load ratings in all four main directions of loading
• Ball Runner Block pre-lubricated at the factory.

Product description

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			15	25	30	35	45
C	N		8850	26700	34800	49400	82400
C0	N		10800	32300	44700	75200	123000
Mt	Nm		85	380	600	1060	2220
Mt0	Nm		100	460	780	1620	3320
ML	Nm		62	270	420	700	1480
ML0	Nm		76	330	540	1060	2210

General technical data

Legend

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.

Dimensions

Dimensions

Project planning information

Combinations of different accuracy classes

For Ball Runner Blocks and Ball Guide Rails Resist CR, hard chrome plated, be aware of differing tolerances of dimensions H and A3 (see "Accuracy classes and their tolerances").

Recommended Ball Runner Blocks for Resist CR Ball Guide Rails of accuracy class H and preload class C0 and C1

Recommended Ball Runner Block, size 15 – 65:

- Accuracy class H

- Preload class C0

Recommended Ball Runner Block, size 30 – 65:

- Accuracy class H

- Preload class C1

Mounting

Maintenance

Certification

Safety Instructions

Ordering codes

Material numbers

Legend

Ordering example

Options:

Ball runner block BSHP Resist CR, SNH

Size 45

Preload class C1

Accuracy class H

With standard seal, with ball chain

Material number: R1621 413 72

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