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Source:未知Author:HONBbearing07 Addtime:2022-01-12 10:18 Click:

Clearance of Crossed Roller Bearings

What is the clearance of a crossed roller bearing?

There is a certain gap between the inner and outer rings and the rolling elements of the rolling bearing, so there can be relative displacement between the inner and outer rings. When there is no load, one ring is fixed, and the other ring moves along the radial and axial directions of the bearing from one limit position to another limit position, which are called radial clearance and axial clearance respectively. 


According to the state of the bearing, the clearance is divided into three types.
 
(1) Original clearance. It refers to the clearance in the free state before the rolling bearing is installed, which is determined by the processing and assembly of the manufacturer.
 
(2) Install clearance. Also called fit clearance. It is the clearance when the bearing, the shaft and the bearing seat are installed but not working. Due to the interference installation, or the inner ring is enlarged, or the outer ring is reduced, or both, the installation clearance is smaller than the original clearance.
 
(3) Working clearance. The clearance of the rolling bearing in the working state, the inner ring has the largest temperature rise and the largest thermal expansion during operation, which reduces the bearing clearance; at the same time, due to the action of the load, elastic deformation occurs at the contact between the rolling element and the raceway, which increases the bearing clearance. , the working clearance of the bearing is larger or smaller than the installation clearance, depending on the combined effect of these two factors.
HONB crossed roller bearings www.hyzcbearing.com
Hazards of Inappropriate Working Clearance of Crossed Roller Bearings
 
Working clearance is an important quality index of rolling bearings, and it is also an important parameter in bearing applications. In actual use, the working clearance of the bearing will affect the load distribution, vibration, noise, friction torque and life of the bearing. Improper working clearance of the bearing can cause harm to the equipment.
 
(1) The working clearance of the bearing is too small.
If the working clearance of the bearing is too small, the friction torque of the bearing will be increased, which will generate a lot of heat, which will easily lead to heat damage to the bearing. This is because when the working clearance of the bearing is too small, the lubrication of the rolling elements of the bearing and the inner and outer rings of the bearing will be poor, and a lot of heat will be generated due to dry friction, resulting in wear, cementation, and cracking of the inner and outer rings of the bearing, which will cause Bearing damage.
 
(2) The working clearance of the bearing is too large.
The working clearance of the bearing is too large, which is mainly caused by the excessive selection of the natural clearance of the bearing and the insufficient pressing force of the bearing. For example, in the reducer running at high speed, when the natural clearance of the bearing is large, the working clearance is relatively large, which will cause the reducer to vibrate greatly during operation and reduce the service life of the bearing.


Luoyang Hongyuan Bearing Technology Co., Ltd. (HONB) was established in December 2005, located in the Luoyang ,China. HONB with more than 400 employees which specializes in manufacture of YRT,YRTS,YRTM,ZKLDF Series rotary table bearings, RA,RB,RE,RU,CRBH,SX Series crossed roller bearings and CSG,SHG,HYR series robot reducer bearings. The precision grades are P2, P4 and P5, and the size range is 20mm ~2000mm.


Products Catalogue:

YRT rotary table bearings
ZKLDF axial angular contact ball bearings

Crossed roller bearings 

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