Super-miniature deep groove ball bearing pre-tightened axially

Abstract

The invention discloses a super-miniature deep groove ball bearing pre-tightened axially, and belongs to the technical field of bearings. The super-miniature deep groove ball bearing comprises a mandrel, an interference fit bearing, a neck bush, a sliding fit bearing, an outer spacer bush and a pre-tightening ring. The interference fit bearing makes contact with the end face of the neck bush to beaxially positioned and is in interference fit with the mandrel. The sliding fit bearing is installed on the mandrel in a spaced manner. The outer ring end face of the sliding fit bearing and the outer ring end face of the interference fit bearing make contact through the outer spacer bush and are positioned axially. The pre-tightening ring and the mandrel are connected in a sliding fit manner. The pre-tightening ring is located on the outer side of the sliding fit bearing. Under the axial pre-tightening force, the pre-tightening ring transmits the axial pre-tightening force to the inner ringof the sliding fit bearing, the pre-tightening force is transmitted to the interference fit bearing through the outer spacer bush, the pre-tightened sliding fit bearing and the pre-tightening ring arefixed through glue, and therefore the axial pre-tightening force at the position can be kept, and the bearing is in the pre-tightened state all the time; and by means of the two pre-tightened bearings, rigidity is increased, axial movement is reduced, noise during operation of the bearing is reduced, and the structure is compact.

Description

technical field [0001] The invention belongs to the technical field of bearings, and in particular relates to an axially preloaded ultra-miniature deep groove ball bearing. Background technique [0002] In order to eliminate the axial clearance of the bearing, improve the rigidity and rotation accuracy of the bearing, and reduce the axial movement, steel ball slippage and noise during the operation of the bearing, the bearing should be properly preloaded in the axial direction. [0003] In the prior art, there are usually two methods for axial preloading of deep groove ball bearings: 1. Constant pressure preloading is to transmit the shaft between the outer rings of the two bearings through a compression spring or a wave spring sheet. Pretighten the bearings on both sides with the direction pretightening force, but this method of using compression springs or wave spring sheets to pretighten the bearings, due to the low manufacturing precision of the springs and components of...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, there are usually two methods for axial preloading of deep groove ball bearings: 1. Constant pressure preloading is to transmit the shaft between the outer rings of the two bearings through a compression spring or a wave spring sheet. Pretighten the bearings on both sides with the direction pretightening force, but this method of using compression springs or wave spring sheets to pretighten the bearings, due to the low manufacturing precision of the springs and components of the pretightening method, causes the bearings to be under stress during operation. In the case of uniformity, problems such as tilting, shaking, and sliding of the outer ring of the bearing are prone to occur, making it difficult for the bearing to run smoothly and the problem of bearing noise is difficult to solve; Grinding and adjusting the pre-tightened spacer, or fixing the position with threads, is time-consuming and requires experienced masters to complete

These two methods also have a common disadvantage that they require a large space, which is difficult to apply to ultra-miniature deep groove ball bearings.

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