Self-decompression multi-lip sealing bearing

Abstract

The invention relates to a self-decompression multi-lip sealing bearing which comprises an inner ring, an outer ring, steel balls arranged between the inner ring and the outer ring, a retainer and a seal ring, wherein the seal ring comprises a sealing piece and an L-shaped framework; the L-shaped framework is arranged in the sealing piece; a chuck is arranged on the outer side edge of the sealingpiece; a plurality of sealing lips forming dip angles outwards are arranged on the inner side edge of the sealing piece; the chuck is mounted in a groove in the inner circumferential surface of the outer ring in a clamping manner; the sealing lips are in interference contact with the outer circumferential surface of the inner ring and are uniformly distributed from inside to outside; the sealing lips and the inner ring jointly form labyrinth seal; the thickness of the sealing lip on the outer side is greater than that of the sealing lip on the inner side; an inner groove is formed in one sideof the sealing lip on the innermost side; an outer groove is formed in one side of the sealing lip on the innermost side; and the sealing piece adopts modified hydrogenated acrylonitrile butadiene rubber. The self-decompression multi-lip sealing bearing is high in sealing performance and can effectively release the pressure intensity in the bearing to enable the internal pressure intensity and external pressure intensity of the bearing to be consistent.

Description

technical field [0001] The invention relates to the field of bearings, in particular to a self-relieving multi-lip seal bearing. Background technique [0002] The seal ring on the existing bearing has a seal and a skeleton. The inner circumference of the seal has three parallel contact lips with the same thickness, which are in contact with the outer diameter surface of the inner ring of the bearing. The unilateral interference is about 0.4mm, and there is a rib for positioning the seal on the outer surface of the skeleton, and its closing diameter is about 1.0mm larger than the outer diameter of the inner ring of the bearing. The interference between them is too small, and the elasticity of the seals is insufficient, which reduces the sealing performance of the sealing ring and affects the lubrication effect of the bearing. This kind of sealing structure is even more insufficient. Dust and the like can easily penetrate into the bearing, and the fine particles are mixed wit...

AI Technical Summary

Problems solved by technology

[0002] The seal ring on the existing bearing has a seal and a skeleton. The inner circumference of the seal has three parallel contact lips with the same thickness, which are in contact with the outer diameter surface of the inner ring of the bearing. The unilateral interference is about 0.4mm, and there is a rib for positioning the seal on the outer surface of the skeleton, and its closing diameter is about 1.0mm larger than the outer diameter of the inner ring of the bearing. The interference between them is too small, and the elasticity of the seals is insufficient, which reduces the sealing performance of the sealing ring and affects the lubrication effect of the bearing. This type of sealing structure is even more insufficient, dust, etc. can easily penetrate into the bearing, and the fine particles are mixed with lubricating grease, which intensifies the wear of the bearing, and finally causes the service life of the bearing to be greatly shortened.

[0003] In addition, most of the existing bearing seals adopt integral sealing and dust-proof design. Although this design has superior sealing performance, it will not only lead to a large starting moment of the bearing, but also the integral dust-proof sealing ring will cause the pressure difference between the inside and outside of the bearing, resulting in The bearing is stuck and fails, and the service life is short

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