Bearing device and half bearing used for the same

Patent metadata

Field	Value
Publication number	US-2016131191-A1
Application number	US-201514931032-A
Country	US
Kind code	A1
Filing date	Nov 3, 2015
Priority date	Nov 7, 2014
Publication date	May 12, 2016
Grant date	—

Abstract

A bearing device includes a bearing member provided with a circumferentially extending sliding surface and a housing holding the bearing member on an inner circumferential surface thereof. The bearing member is provided with a bearing outer peripheral surface on one side thereof facing the housing. The bearing outer peripheral surface is surface roughened. The housing is provided with a housing inner peripheral surface on one side thereof facing the bearing member. The housing inner peripheral surface is surface roughened. When a mean height Rc of a roughness curve element of either of the bearing outer peripheral surface and the housing inner peripheral surface is Xμm, the remaining other of the bearing outer peripheral surface and the housing inner peripheral surface has a material ratio Rmr (Xμm) of roughness curve being equal to or less than 10% in at least one measurement direction.

First claim

What is claimed is:

1 . A bearing device comprising:
a bearing member provided with a circumferentially extending sliding surface; and a housing holding the bearing member on an inner circumferential surface thereof; wherein the bearing member is provided with a bearing outer peripheral surface on one side thereof facing the housing, the bearing outer peripheral surface being surface roughened, wherein the housing is provided with a housing inner peripheral surface on one side thereof facing the bearing member, the housing inner peripheral surface being surface roughened, and wherein when a mean height Rc of a roughness curve element of either of the bearing outer peripheral surface and the housing inner peripheral surface is Xμm, the remaining other of the bearing outer peripheral surface and the housing inner peripheral surface has a material ratio Rmr (Xμm) of roughness curve being equal to or less than 10% in at least one measurement direction.

2 . The bearing device according to claim 1 , wherein the bearing outer peripheral surface and the housing inner peripheral surface are provided with fine projections and recesses in which material ratio Rmr (50%) of roughness curve at cut level of 50% falls in a range of 20%≦Rmr (50% )≦80% in two or more different measurement directions, and
wherein, among the housing inner peripheral surface and the bearing outer peripheral surface, whichever having smaller mean height Rc of the roughness curve element has a material ratio Rmr (50%) of the roughness curve falling in a range of 40%≦Rmr (50%)≦60%.

3 . The bearing device according to claim 1 , wherein, among the housing inner peripheral surface and the bearing outer peripheral surface, whichever having smaller mean height Rc of the roughness curve element has a mean height Rc falling in a range of Rc≦4 μm.

4 . The bearing device according to claim 1 , wherein the bearing outer peripheral surface and the housing inner peripheral surface are at least surface roughened at least in a portion where fretting damages may occur by the relative circumferential micro slipping of the bearing member and the housing caused by deformation of at least either of the bearing member and the housing.

5 . The bearing device according to claim 1 , further comprising a connecting rod being connected to an engine piston, wherein the housing is provided on one end of the connecting rod opposite of the end being connected to the engine piston, and
wherein surface roughening is applied in a range of the bearing outer peripheral surface and the housing inner peripheral surface extending from 31 70 degrees to −30 degrees and from 30 degrees to 70 degrees centered on an axial center of the bearing member when 0 degrees is taken along a longer side direction of the connecting rod.

6 . A half bearing used in the bearing device according to claim 1 being circumferentially divided in two.

7 . An engine provided with the bearing device according to claim 1 .

Assignees

• Daido Metal Co

Inventors

• Sonobe Hiromi
• Nakano Yuta

Classifications

• F16C35/02 Primary

  in the case of sliding-contact bearings · CPC title

• F16C33/08

  Attachment of brasses, bushes or linings to the bearing housing · CPC title

• F16C2202/04

  Hardness · CPC title

• F16C2226/80

  with splines, serrations or similar profiles to prevent movement between joined parts · CPC title

• F16C2223/00

  Surface treatments; Hardening; Coating · CPC title