Double-sealed double-outer-ring long-shaft double-row ball bearing with O-shaped ring pre-tightening function

Abstract

The invention discloses a double-sealed double-outer-ring long-shaft double-row ball bearing with an O-shaped ring pre-tightening function. The bearing comprises a long shaft and a pair of bearing outer rings, wherein a pair of first channels is formed in the surface of the long shaft; the inner surface of each bearing outer ring is provided with a second channel and a dustproof groove located outside each second channel; the bearing outer rings corresponds to the first channels on the surface of the long shaft one by one; a sealing ring is arranged in each dustproof groove; an isolation sleeve with two ends located in the middle of the inner diameter of the two bearing outer rings is installed outside the long shaft; and an O-shaped ring for axially pre-tightening the bearing outer ringson the two sides is arranged in the middle of the bearing outer rings. According to the double-sealed double-outer-ring long-shaft double-row ball bearing with the O-shaped ring pre-tightening function, by using the O-shaped ring instead of two plain washers and one compression spring for pre-tightening, the outer diameter of the two bearing outer rings is increased and the axial spacing distancebetween the two bearing outer rings is reduced; and the structure is simple, lower vibration and noise are generated in the working process, and the bearing with longer service life and better reliability can meet the requirements of people.

Description

technical field [0001] The invention relates to the field of miniature high-speed motors, in particular to a two-sided sealed double-outer-ring long-axis double-row ball bearing with O-ring preload. Background technique [0002] At present, in the prior art, the double-outer ring long-axis bearings used in the dust-proof covers on both sides of miniature high-speed motors and high-speed electric tools, such as figure 1 As shown, this kind of bearing consists of two standard outer rings (hereinafter referred to as outer rings), a long shaft integrated with two inner ring channels, two rows of steel balls, two nylon cages, two flat washers 13, a It consists of a compression spring 14, an appropriate amount of grease, and a dust cover 15 installed on each of the two end faces, which is installed in the bearing outer shell 16, and then installed in the bearing housing together with the bearing outer ring 16; There are two flat washers 13, and there is a compression spring 14 be...

AI Technical Summary

Problems solved by technology

However, because the characteristic of this bearing is that the shaft rotates, the inner diameter of the outer ring of the bearing and the outer ring of the bearing 16 is a spaced fit (during the rotation of the bearing, the slight rotation of the outer ring in the outer ring 16 in the circumferential direction makes the entire groove of the outer ring The road can be stressed to prolong the life of the bearing), but it is precisely because the two outer rings are installed in the bearing housing 16 with a gap, and the width of the two outer rings is small, the outer rings are easy to deflect and shake during the operation of the bearing. Stable, and the axial distance between the two outer rings is large, when the outer rings move and deflect, the lag time of the compression spring 14 to the two outer rings’ movement and deflection preload response is relatively long, resulting in the bearing running at high speed It is difficult to avoid the axial movement and the smooth operation of the bearing, so the vibration and noise caused by the movement of the bearing during high-speed operation are difficult to reduce, which affects people's comfort

At the same time, due to the fixed size of the bearing seat, the outer diameter of the original bearing is only equivalent to the inner diameter of the bearing outer shell 16, which is smaller than the inner diameter of the bearing seat. The space of the bearing is small, the wall of the outer ring is thinner, and the steel balls are smaller. subject to certain restrictions

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