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Sealed rolling bearing

A technology for rolling bearings and sealing lips, which is applied to the sealing of bearing elements, shafts and bearings, and engines. It can solve the problems of inability to prevent rainwater or muddy water from entering, and uneven interference of sealing lips, so as to prevent lubricating oil from leaking and maintain The effect of sealing performance

Inactive Publication Date: 2009-09-09
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned existing sealed rolling bearing that uses a sealing member to seal the inside of the bearing has the following disadvantages: since the circumferential flatness of the sealing surface that the sealing lip of the sealing member elastically contacts exceeds 25 μm, the interference of the sealing lip The circumferential direction of the sealing surface is not uniform. In addition, when the outer ring rotates at high speed, the front end of the sealing lip cannot keep up with the change of the axial position of the sealing surface, and it cannot prevent the immersion of rainwater or muddy water.

Method used

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Embodiment Construction

[0018] Embodiments of the present invention will be described below with reference to the drawings. like figure 1 As shown, the sealed rolling bearing consists of an outer ring 1; an inner ring 2 installed inside the outer ring; a rolling body 3 that supports the outer ring 1 and inner ring 2 and enables them to rotate relatively freely; 4 and a pair of sealing members 5 that seal off a bearing space formed between the facing surfaces of the outer ring 1 and the inner ring 2 .

[0019] A raceway groove 6 is formed on the inner diameter surface of the outer ring 1 and a pair of seal grooves 7 are formed on both sides of the raceway groove. On the other hand, on the outer diameter surface of the inner ring 2 is formed a track groove 8 radially opposite to the track groove 6 of the outer ring 1, between the track groove 8 of the inner ring and the track groove 6 of the outer ring. Rolling elements 3 are assembled between them.

[0020] In addition, a pair of annular grooves 9 ...

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Abstract

A sealed rolling bearing having excellent sealing ability substantially reliably preventing entry of muddy water into the bearing. A pair of seal grooves (7) is formed in both ends of the bore surface of an outer ring (1), and a seal member (5) is fitted at its outer diameter section to each of the pair of seal grooves (7). An inward facing seal lip (12), formed at the bore of each seal member (5), is made to be in elastic contact with an inner seal surface (10) of a ring groove (9) formed in each end of the outer diameter surface of an inner ring (2). The flatness A in the circumferential direction of that a contact section X of the seal surface (10) with which the seal lip (12) is in elastic contact is set within the range of 5 - 20 [mu]m. Thus, sealing ability of the contact section is enhanced to prevent entry of muddy water etc. into the inside of the bearing.

Description

technical field [0001] The invention relates to sealed rolling bearings. Background technique [0002] Magnetic clutch bearings, pulley bearings, and alternator bearings for automotive air conditioners are used in environments exposed to rainwater, muddy water, etc., so sealed rolling bearings that can prevent rainwater and muddy water from entering are generally used. [0003] Conventionally known as sealed rolling bearings are bearings in which rolling elements are assembled between raceway grooves formed on the inner diameter surface of the outer ring and raceway grooves provided on the outer diameter surface of the inner ring, and on the inner diameter surface of the outer ring A pair of sealing grooves are formed on both sides of the upper raceway groove, and the outer diameter part of the sealing member is fitted in each sealing groove. The sealing surface on the inner side of the annular groove on the surface is elastically contacted, thereby sealing the inside of th...

Claims

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Application Information

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IPC IPC(8): F16C33/78F16J15/32F16J15/3232
Inventor 村松诚
Owner NTN CORP
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