BSHP Ball Runner Block FNS, standard, aluminum, without ball chain R1631 … 2.

Description

• Area of application: For lightweight design – for compensating low tolerances with connected structures
• Optimized entry-zone geometry and high number of balls minimize variation in elastic deflection
• Extra-compact lightweight design 60 % less weight due to aluminum compared to steel Ball Runner Blocks
• Maximum precision
• Patented entry zone increases the travel accuracy up to a factor of six

Features

• Can be used on all SNS Ball Guide Rails
• Lube port with metal thread on all sides
• Improved rigidity under lift-off and side loading conditions due to two additional mounting screw holes at the center of the Ball Runner Block
• Attachments on the Ball Runner Block can be mounted from above and below
• Limitless interchangeability as all Ball Rail Systems can be combined at will with all Ball Runner Block versions within each accuracy class.
• Ball Runner Block pre-lubricated at the factory.
• Minimum quantity lubrication with integrated reservoir for oil lubrication
• Predrilled holes on the Ball Runner Block for pinned fitting
• Enables greater parallelism and height offsets of mounting bases
• Smooth, quiet running thanks to optimally designed ball return and guidance
• Accuracy classes H and N are combinable with all rails in each accuracy class
• Long-term lubrication is possible over several years

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.

Characteristic features

Rexroth Ball Rail Systems with aluminum Ball Runner Blocks have been developed specially for industrial robots and general machine building requiring compact, ball bearing-mounted longitudinal guides in various accuracy classes with very high load capacity and low weight. The extremely small and lightweight guide units in five common sizes have the same high load ratings in all four main directions of loading.

Technical data

Load capacities and load moments

Size			15	20	25	30	35
C	N		9860	23400	28600	36500	51800
Fmax	N		3000	7200	8800	12200	16200
Mt	Nm		95	300	410	630	1110
Mt max	Nm		29	92	125	210	345
ML	Nm		68	200	290	440	720
ML max.	Nm		16	50	70	110	170

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