Protective cover and bearing device including protective cover

Patent metadata

Field	Value
Publication number	US-10005318-B2
Application number	US-201715666660-A
Country	US
Kind code	B2
Filing date	Aug 2, 2017
Priority date	Aug 28, 2014
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

The present invention is intended to provide a protective cover, comprising an inner ring 12 with an inner ring track surface 12 A on an outer peripheral surface; an outer ring 13 with an outer ring track surface 13 A on an inner peripheral surface; a bearing with rolling elements 14 between the inner ring track surface 12 A and the outer ring track surface 13 A; a magnetic encoder 8 that is positioned at one axial end portion of the bearing and fixed to the inner ring 12 ; and a magnetic sensor that is fixed to the outer ring 13 , a cup-shaped protective cover 1 press-fitted into the outer ring 13 to cover the magnetic encoder 8 and intervene between the magnetic encoder 8 and the magnetic sensor is formed by performing cold press molding of an austenitic stainless steel plate material with a nickel content of 8.5 to 13 weight %.

First claim

The invention claimed is:

1. An apparatus, comprising:
a bearing having at least an inner ring, an outer ring, and a rolling element, the inner ring having an inner ring track surface on an outer peripheral surface, the outer ring having an outer ring track surface on an inner peripheral surface, and the rolling element being between the inner ring track surface and the outer ring track surface;
a support member having a cylindrical part and an annular part;
a magnetic encoder that is positioned at one axial end portion of the bearing, fixed to the inner ring, and has N and S poles alternately arranged at regular intervals in the circumferential direction, the magnetic encoder being fixed to the annular part of the support member, the cylindrical part of the support member being fixed to the inner ring;
a magnetic sensor that is fixed to the outer ring so as to be opposed to the magnetic poles of the magnetic encoder to detect the rotation of the magnetic encoder; and
a cup-shaped protective cover being press-fitted into the outer ring to cover the magnetic encoder and intervene between the magnetic encoder and the magnetic sensor,
wherein the protective cover is formed by performing cold press molding of an austenitic stainless steel plate material,
wherein the austenitic stainless steel plate material is selected so that a maximum value of residual flux density of a surface of the protective cover facing the magnetic sensor is less than or equal to 54%, with reference to a state where the austenitic stainless steel plate is SUS304 with the minimum nickel content (a nickel content of 8.00 weight %),
wherein the protective cover has a first cylindrical part substantially parallel to the cylindrical part of the support member, a second cylindrical part having a single section extending in a first direction substantially parallel to the cylindrical part of the support member, a first annular part substantially parallel to the annular part of the support member, a third cylindrical part substantially parallel to the cylindrical part of the support member, and a disc part substantially parallel to the annular part of the support member,
wherein the second cylindrical part is disposed between the first cylindrical part and the first annular part,
wherein the third cylindrical part is disposed between the first annular part and the disc part,
wherein the disc part is directly connected with the third cylindrical part,
wherein the single section extends from a first position located at a first side of the magnetic encoder to a second position located at a second side of the magnetic encoder,
wherein the single section is continuously substantially parallel to the cylindrical part of the support member without a stepped configuration,
wherein the first side of the magnetic encoder is disposed to face the rolling element,
wherein the second side of the magnetic encoder is disposed to face the magnetic sensor,
wherein the disc part is spaced apart from the inner ring along the first direction, and
wherein the annular part of the support member has a first side facing the rolling element and a second side facing the magnetic sensor, wherein the magnetic encoder is attached to the second side of the annular part of the support member.

2. The apparatus according to claim 1 , further comprising a seal body adhered to the second cylindrical part, wherein the seal body includes at least one selected from among a group consisting of nitrile rubber, hydrogenated nitrile rubber, acrylic rubber, ethylene-acrylic rubber, fluorine rubber, and silicone rubber.

Assignees

• Nakanishi Metal Works Co

Inventors

• Komai Toshinari

Classifications

• F16C2326/02

  Wheel hubs or castors · CPC title

• B60B2900/1212

  due to friction · CPC title

• G01D5/2451

  Incremental encoders (G01D5/2454 takes precedence) · CPC title

• C21D2211/001

  Austenite · CPC title

• B60B27/0005

  with ball bearings · CPC title