Bearing assembly with encoder ring in slidable contact with sensor

• US 5,017,868 A
• Filed: 03/01/1990
• Issued: 05/21/1991
• Est. Priority Date: 04/18/1989
• Status: Expired due to Term

• Current Assignee: The Torrington Company (The Timken Company)
• Original Assignee: The Torrington Company (The Timken Company)
• Inventors: Hajzler, Christian
• Primary Examiner(s): Strecker, Gerard R.
• Application Number:
  US07/486,684
• Time in Patent Office: 446 Days
• Field of Search: 324/173, 324/174, 324/207.22, 324/207.25, 324/207.20, 73/517 R, 73/518, 73/519, 310/155, 310/168, 384/446, 384/448, 188/181 R, 180/141-143
• US Class Current: 324/207.22
• CPC Class Codes: F16C 2326/24 Steering systems, e.g. steering rods or columns in general B62D
• CPC Class Codes: F16C 41/007 Encoders, e.g. parts with a plurality of alternating magnetic poles
• CPC Class Codes: G01P 3/443 mounted in bearings bearings F16C
• CPC Class Codes: G01P 3/487 delivered by rotating magnets

Abstract

An encoder ring with multiple North and South poles around its circumference is connected to the rotatable race of a bearing assembly for rotation with the rotatable race. A sensor is connected to the fixed race. The encoder ring is kept in slidable contact with the sensor. The slidable contact is maintained by a flexible member which keeps the encoder ring in slidable contact with the sensor.

Claims

1. A bearing assembly comprising:

an inner race and an outer race providing an inner race--outer race annulus, one of said races being fixed, the other race being rotatable;

rolling members located in said annulus around the inner race circumference;

a magnetic field sensor connected to the fixed race; and

an encoder ring with multiple north and south poles around its circumference and elastically connected to the rotatable race for rotation with rotatable race,

the elastic connection being a biasing means for maintaining the encoder ring in slidable contact with the magnetic field sensor.

2. A bearing assembly in accordance with claim 1 wherein:

the inner race is the rotatable race.

3. A bearing in accordance with claim 2 wherein the biasing means comprises:

a mounting ring connected to the inner race and having an elastic portion in contact with the encoder ring, said elastic portion tapering radially inwardly from the encoder ring toward the inner race.

4. A bearing in accordance with claim 2 wherein the biasing means comprises:

a member mounted about the inner race and having two radially separated axially extending portions interconnected by a diagonal flexible portion, the radially outer axially extending portion contacting the encoder ring.

5. A bearing in accordance with claim 2 wherein the biasing means comprises:

an annular mounting ring about the inner race and an annular member mounted on the mounting ring and made of a compressible material, the compressible material contacting the encoder ring.

6. A bearing in accordance with claim 2 wherein the biasing means comprises:

a flexible disk mounted about the inner race, and the encoder ring is attached to the flexible disk.

7. A bearing assembly in accordance with claim 1 wherein the outer race is the rotatable race.

8. A bearing in accordance with claim 7 wherein the biasing means comprises:

a mounting ring connected to the outer race and having an elastic portion in contact with the encoder ring, said elastic portion tapering radially inwardly from the encoder ring toward the outer race.

9. A bearing in accordance with claim 7 wherein the biasing means comprises:

a member mounted about the outer race and having two radially separated axially extending portions interconnected by a diagonal flexible portion, the radially inner axially extending portion contacting the encoder ring.

10. A bearing in accordance with claim 7 wherein the biasing means comprises:

an annular mounting ring about the outer race and an annular member mounted on the mounting ring and ring and made of a compressible material, the compressible material contacting the encoder ring.

11. A bearing in accordance with claim 7 wherein the biasing means comprises:

a flexible disk mounted about the outer race, and the encoder ring is attached to the flexible disk.

12. A bearing assembly comprising:

an inner race and an outer race providing an inner race--outer race annulus, one of said races being fixed, the other race being rotatable;

rolling members located in said annulus around the inner race circumference;

an encoder ring with multiple north and south poles around its circumference and connected to the rotatable race for rotation with the rotatable race; and

a magnetic field sensor elastically connected to the fixed race, the encoder ring being in slidable contact with the sensor the elastic connection comprising an annular member connected to the fixed race and having a radially extending flange axially spaced from the sensor, and an elastomer ring having its axial ends connected to the sensor and the flange at radially offset points.