Bearing device

Patent metadata

Field	Value
Publication number	US-9194427-B2
Application number	US-201514640091-A
Country	US
Kind code	B2
Filing date	Mar 6, 2015
Priority date	Mar 14, 2014
Publication date	Nov 24, 2015
Grant date	Nov 24, 2015

Abstract

Disclosed is a bearing device including: a bearing housing made of an Al alloy and having a bearing holding hole; a sliding bearing having a cylindrical shape and forced into the bearing holding hole; and a shaft supported with an inner circumferential surface of the sliding bearing, wherein in the sliding bearing to be forced into, a plurality of hardened convex portions projecting toward the second circumferential direction end surface being formed on the first circumferential direction end surface, a plurality of hardened concave portions corresponding to the plurality of hardened convex portions being formed on the second circumferential direction end surface, a first hardened area being formed on each of the hardened convex portions of the first circumferential direction end surface and its vicinity, and a second hardened area being formed on each of the hardened concave portions of the second circumferential direction end surface and its vicinity.

First claim

The invention claimed is:

1. A bearing device comprising:
a bearing housing made of an Al alloy and having a bearing holding hole;
a sliding bearing having a cylindrical shape and press-fitted into the bearing holding hole; and
a shaft supported with an inner circumferential surface of the sliding bearing, wherein
the sliding bearing to be press-fitted into the bearing holding hole includes a Fe alloy back metal layer on an outside diameter side of the cylindrical shape, and a sliding layer on an inside diameter side of the cylindrical shape,
the sliding bearing having a first circumferential direction end surface and a second circumferential direction end surface, the first circumferential direction end surface and the second circumferential direction end surface facing each other,
a plurality of hardened convex portions projecting toward the second circumferential direction end surface being formed on the first circumferential direction end surface,
a plurality of hardened concave portions corresponding to the plurality of hardened convex portions being formed on the second circumferential direction end surface,
a dimensional relation between a maximum height LK 1 of a top of each of the hardened convex portions and a maximum depth LK 2 of a bottom of each of the corresponding hardened concave portions being LK 1 >LK 2 ,
each of the hardened convex portions having a width HK 1 in an axial direction of the sliding bearing on the first circumferential direction end surface, and each of the hardened concave portions having a width HK 2 in the axial direction on the second circumferential direction end surface,
a dimensional relation between the width HK 1 of each of the hardened convex portions and the width HK 2 of each of the corresponding hardened concave portions being HK 1 <HK 2 ,
a first hardened area KR 1 being formed on each of the hardened convex portions of the first circumferential direction end surface and its vicinity, the Fe alloy back metal layer being hardened in the first hardened area KR 1 such that a hardness of the Fe alloy back metal layer is maximum on the top of each of the hardened convex portions and gradually decreases toward a circumferential direction central portion side of the sliding bearing, and
a second hardened area KR 2 being formed on each of the hardened concave portions of the second circumferential direction end surface and its vicinity, the Fe alloy back metal layer being hardened in the second hardened area KR 2 such that a hardness of the Fe alloy back metal layer is maximum on the bottom of each of the hardened concave portions and gradually decreases toward the circumferential direction central portion side of the sliding bearing.

2. The bearing device according to claim 1 , wherein the plurality of hardened convex portions and a plurality of flat surfaces are formed on the first circumferential direction end surface, each of the hardened convex portions and each of the flat surfaces being alternately arranged in the axial direction of the sliding bearing, and both ends in the axial direction being the flat surfaces.

3. The bearing device according to claim 2 , wherein each of the flat surfaces of the first circumferential direction end surface and each of the flat surfaces of the second circumferential direction end surface extend in a direction intersecting perpendicularly with the circumferential direction of the sliding bearing.

4. The bearing device according to claim 1 , wherein the plurality of hardened concave portions and a plurality of flat surfaces are formed on the second circumferential direction end surface, each of the hardened concave portions and each of the flat surfaces being alternately arranged in the axial direction of the sliding bearing, and both ends in the axial direction being the flat surfaces.

5. The bearing device according to claim 3 , wherein each of the flat surfaces of the first circumferential direction end surface and each of the flat surfaces of the second circumferential direction end surface extend in a direction intersecting perpendicularly with the circumferential direction of the sliding bearing.

6. The bearing device according to claim 1 , wherein the maximum height LK 1 of the top of each of the hardened convex portions is located on a central portion of the width HK 1 , and a height of each of the hardened convex portions gradually decreases from the top toward both ends in a width direction of each of the hardened convex portions.

7. The bearing device according to claim 1 , wherein the maximum depth LK 2 of the bottom of each of the hardened concave portions is located on a central portion of the width HK 2 , and a depth of each of the hardened concave portions gradually decreases from the bottom toward both ends in a width direction of each of the hardened concave portions.

8. The bearing device according to claim 1 , wherein the maximum height LK 1 of each of the hardened convex portions has a length corresponding to 0.1 to 1.2% of an outer circumferential length of the sliding bearing.

9. The bearing device according to claim 1 , wherein the maximum heights LK 1 of the plurality of hardened convex portions are the same as each other and the widths HK 1 of the plurality of hardened convex portions are the same as each other, and the maximum depths LK 2 of the plurality of hardened concave portions are the same as each other and the widths HK 2 of the plurality of hardened concave portions are the same as each other.

10. The bearing device according to claim 1 , wherein a second circumferential direction space S 2 is formed between the first circumferential direction end surface and the second circumferential direction end surface in a state that the first circumferential direction end surface butts against the second circumferential direction end surface and the top of each of the hardened convex portions comes in contact with the bottom of each of the hardened concave portions.

11. The bearing device according to claim 10 , wherein the second circumferential direction space S 2 has a length corresponding to 0.04 to 0.6% of the outer circumferential length of the sliding bearing.

12. The bearing device according to claim 1 , wherein the plurality of hardened convex portions are formed on only the first circumferential direction end surface, and the plurality of hardened concave portions are formed on only the second circumferential direction end surface.

13. The bearing device according to claim 1 , wherein each of the hardened convex portions is formed also on the second circumferential direction end surface, and each of the hardened concave portions is formed also on the first circumferential direction end surface.

14. The bearing device according to claim 1 , wherein the first hardened area KR 1 of the first circumferential direction end surface is formed within a range of a central angle θ 1 of 1° to 10° from the top of each of the hardened convex portions toward the circumferential direction central portion side of the sliding bearing.

15. The bearing device according to claim 1 , wherein the second hardened area KR 2 of the second circumferential direction end surface is formed within a range of a central angle θ 2 of 1° to 10° from the bottom of each of the hardened concave portions toward the circumferential direction central portion side of the sliding bearing.

Assignees

• Daido Metal Co

Inventors

• Kumagai Yuichi
• Imamura Akiyoshi
• Koga Atsushi

Classifications

• F16C33/14 Primary

  Special methods of manufacture; Running-in · CPC title

• F16C33/046

  divided or split, e.g. half-bearings or rolled sleeves · CPC title

• F16C33/125

  Details of bearing layers, i.e. the lining · CPC title

• F16C17/02 Primary

  for radial load only · CPC title

• F16C17/22

  with arrangements compensating for thermal expansion · CPC title