Wide Ball Runner Block BNS, steel, with ball chain R1671 … 2.

Description

• Area of application: For high torsional moments on rails
• The same high load ratings in all four main directions of loading
• Long-term lubrication is possible over several years
• Excellent dynamic characteristics
• Attachments on the Ball Runner Block can be mounted from above and below

Features

• High torque capacity
• Integrated all-around sealing
• Low noise level and optimum travel behavior
• Improved rigidity under lift-off and side loading conditions due to two additional mounting screw holes at the center of the Ball Runner Block
• Can be used on all BNS Ball Guide Rails
• Wide range of accessories
• End-face fastening thread for all attachments
• Lube port with metal thread on all sides
• Optimized entry-zone geometry and high number of balls minimize variation in elastic deflection
• Maximum system rigidity due to pre-tensioned O-arrangement
• Quiet, smooth running thanks to optimally designed ball and ball chain return and guidance
• Very high torsional moment load capacity and very high torsion resistance – therefore primarily used as an individual guide
• Ball Runner Block pre-lubricated at the factory.
• Ball chain for low noise level and best travel behavior

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.

Attention! Size 20/40:

New Ball Rail Systems with different ball diameters. Not interchangeable with the old 20/40 size!

Technical data

Load capacities and load moments

Size			20/40 1)	25/70
C	N		13700	33700
C0	N		18200	45200
Mt	Nm		310	1260
Mt0	Nm		410	1680
ML	Nm		130	460
ML0	Nm		170	620

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

Mounting

Maintenance

Certification

Safety Instructions

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