Half thrust bearing and bearing device using the same

Patent metadata

Field	Value
Publication number	US-10006490-B2
Application number	US-201615198386-A
Country	US
Kind code	B2
Filing date	Jun 30, 2016
Priority date	Jul 10, 2015
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

A half thrust bearing having a semicircular shape includes a thrust bearing body having a slide surface that receives an axial force from a crankshaft, and thrust reliefs formed adjacent to respective end portions of the thrust bearing body. Wall thicknesses of the thrust reliefs decrease to the respective end portions. Each thrust relief length continuously increases in a direction from an inner circumference to an outer circumference of the half thrust bearing. Each thrust relief length is a length, in a direction perpendicular to a plane that includes an end portion of the half thrust bearing, from the plane to a point at which a surface of each thrust relief intersects an inner circumference of the thrust bearing body. The half thrust bearing includes a bearing alloy layer and a resin slide layer, or additionally a back metal layer. The slide surface includes the resin slide layer.

First claim

The invention claimed is:

1. A half thrust bearing in a semicircular ring shape for receiving an axial force of a crankshaft of an internal combustion engine, the half thrust bearing comprising a bearing alloy layer and a resin slide layer, or a back metal layer, a bearing alloy layer and a resin slide layer, the resin slide layer constituting a slide surface receiving the axial force, wherein
the half thrust bearing comprises thrust reliefs formed on a side receiving the axial force and adjacent to both circumferential end portions of the half thrust bearing, so that a wall thickness of the half thrust bearing becomes thinner toward the circumferential end portions,
each of the thrust reliefs has a thrust relief length which becomes larger continuously from an inner end portion to an outer end portion in a radial direction of the half thrust bearing, and
the thrust relief length is a length measured from a plane including both circumferential end surfaces of the half thrust bearing to the slide surface, in a direction perpendicular to the plane.

2. The half thrust bearing according to claim 1 , wherein each of the thrust reliefs has a thrust relief depth at a circumferential end surface of the half thrust bearing that becomes larger toward the outer end portion from the inner end portion in the radial direction of the half thrust bearing.

3. The half thrust bearing according to claim 2 , wherein each of the thrust reliefs includes a flat surface or a curved surface.

4. The half thrust bearing according to claim 1 , wherein each of the thrust reliefs includes a flat surface or a curved surface.

5. The half thrust bearing according to claim 1 , wherein each of the thrust reliefs includes two flat surface portions, two curved surface portions, or a flat surface portion and a curved surface portion.

6. The half thrust bearing according to claim 1 , wherein each of the thrust reliefs includes a first curved surface portion adjacent to the circumferential end surface of the half thrust bearing, and a flat surface portion adjacent to the slide surface.

7. The half thrust bearing according to claim 1 , wherein
each of the thrust reliefs includes a first curved surface portion adjacent to the circumferential end surface of the half thrust bearing, and a second curved surface portion adjacent to the slide surface,
the first curved surface portion adjacent to the circumferential end surface is concave from a slide surface side toward to a surface side opposite to the slide surface side, along the radial direction, and
the second curved surface adjacent to the slide surface is convex toward the slide surface side from the surface side opposite to the slide surface side.

8. A bearing device for a crankshaft of an internal combustion engine, comprising:
a crankshaft of an internal combustion engine;
a pair of half bearings which support a journal portion of the crankshaft, each half bearing comprising crush reliefs formed on its inner circumferential surface and adjacent to both circumferential end portions of the half bearing;
a bearing housing in which a holding hole for holding the pair of half bearings is formed to penetrate through the bearing housing; and
at least one half thrust bearing according to claim 1 , the half thrust bearing being disposed on an axial end surface of the bearing housing, wherein
each of the thrust reliefs is formed so that a sectional area of a thrust relief clearance at the inner end portion in the radial direction of the half thrust bearing is smaller than a sectional area of a crush relief clearance at a corresponding axial end portion of the half bearing.

9. The bearing device according to claim 8 , wherein each of the thrust reliefs is formed so that a thrust relief length at the inner end portion in the radial direction of the half thrust bearing is longer than a crush relief length at the corresponding axial end portion of the half bearing.

10. A bearing device for a crankshaft of an internal combustion engine, comprising:
a crankshaft of an internal combustion engine;
a pair of half bearings for supporting a journal portion of the crankshaft, each half bearing comprising crush reliefs formed on its inner circumferential surface and adjacent to both circumferential end portions of the half bearing;
a bearing housing in which a holding hole for holding the pair of half bearings is formed to penetrate through the bearing housing; and
at least one half thrust bearing according to claim 1 , the half thrust bearing being disposed on an axial end surface of the bearing housing, wherein
each of the thrust reliefs is formed so that a thrust relief length at the inner end portion in the radial direction of the half thrust bearing is longer than a crush relief length at a corresponding axial end portion of the half bearing.

11. A half thrust bearing having a semicircular shape, comprising:
a thrust bearing body having a slide surface that receives an axial force from a crankshaft associated with the half thrust bearing;
a first thrust relief formed adjacent to a first end portion of the thrust bearing body; and
a second thrust relief formed adjacent to a second end portion of the thrust bearing body, wherein
a first wall thickness of the first thrust relief decreases toward the first end portion,
a second wall thickness of the second thrust relief decreases toward the second end portion,
a first thrust relief length continuously increases in a direction from an inner circumference of the half thrust bearing to an outer circumference of the half thrust bearing,
a second thrust relief length continuously increases in the direction from the inner circumference of the half thrust bearing to the outer circumference of the half thrust bearing,
the first thrust relief length is a length, in a direction perpendicular to a first plane that includes a first end portion of the half thrust bearing, from the first plane to a first point at which a surface of the first thrust relief intersects an inner circumference of the thrust bearing body, and
the second thrust relief length is a length, in a direction perpendicular to a second plane that includes a second end portion of the half thrust bearing, from the second plane to a second point at which a surface of the second thrust relief intersects the inner circumference of the half thrust bearing, and
wherein the half thrust bearing includes a bearing alloy layer and a resin slide layer, and the slide surface includes the resin slide layer.

12. The half thrust bearing of claim 11 , wherein the half thrust bearing further includes a back metal layer.

Assignees

• Daido Metal Co

Inventors

• Tanaka Shiho
• Ozawa Yoshihiro

Classifications

• F16C17/10

  for both radial and axial load · CPC title

• F02F7/0053

  Crankshaft bearings fitted in the crankcase · CPC title

• F16C33/046 Primary

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

• F16C33/206

  with three layers · CPC title

• F16C2240/46

  Gap sizes or clearances · CPC title