Half thrust bearing and bearing device using the same

Patent metadata

Field	Value
Publication number	US-9982709-B2
Application number	US-201514806710-A
Country	US
Kind code	B2
Filing date	Jul 23, 2015
Priority date	Aug 4, 2014
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

The present invention provides a half thrust bearing in a semicircular ring shape for receiving an axial force of the crankshaft of the internal combustion engine, including thrust reliefs formed adjacent to both circumferential end portions of a slide surface which receives the axial force, so that a wall thickness of the half thrust bearing becomes thinner toward the circumferential end portions, wherein at least the thrust relief on a rear side in a rotational direction of the crankshaft has a thrust relief length which becomes larger toward an outer end portion from an inner end portion in a radial direction of the half thrust bearing. The present invention also provides a bearing device including the above half thrust bearing, a crankshaft, a pair of half bearings supporting a journal portion of the crankshaft, and a bearing housing having a holding hole for holding the pair of half bearings.

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, comprising:
thrust reliefs formed adjacent to both circumferential end portions of a slide surface which receives the axial force, so that a wall thickness of the half thrust bearing becomes thinner toward the circumferential end portions, wherein
each of the thrust reliefs has a thrust relief length which becomes larger from an inner end portion toward an outer end portion in a radial direction of the half thrust bearing, and
each of the thrust relief lengths is a length in a direction perpendicular to each end surface of the half thrust bearing, from a virtual plane, which extends from each end surface in a direction parallel to each end surface, to a point at which a surface of each thrust relief intersects the slide surface.

2. The half thrust bearing according to claim 1 , wherein at least the thrust relief on a rear side in a rotational direction of the crankshaft 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 1 , wherein at least the thrust relief on a rear side in a rotational direction of the crankshaft includes a flat surface or a curved surface.

4. The half thrust bearing according to claim 1 , wherein at least the thrust relief on a rear side in a rotational direction of the crankshaft includes two flat surface portions, two curved surface portions, or a flat surface portion and a curved surface portion.

5. 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 adjacent to both circumferential end portions of an inner circumferential surface thereof;
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 4 , the half thrust bearing being disposed on an axial end surface of the bearing housing, wherein
at least the thrust relief on the rear side in the rotational direction of the crankshaft 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.

6. The bearing device according to claim 5 , wherein at least the thrust relief on the rear side in the rotational direction of the crankshaft 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.

7. 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 adjacent to both circumferential end portions of an inner circumferential surface thereof;
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 4 , the half thrust bearing being disposed on an axial end surface of the bearing housing, wherein
at least the thrust relief on the rear side in the rotational direction of the crankshaft 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.

8. The half thrust bearing according to claim 1 , wherein at least the thrust relief on a rear side in a rotational direction of the crankshaft 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.

9. The half thrust bearing according to claim 1 , wherein at least the thrust relief on a rear side in a rotational direction of the crankshaft 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 a curved surface in a convex shape toward a back surface side from a slide surface side, seen in the radial direction, and
the second curved surface adjacent to the slide surface is a curved surface in a convex shape toward the slide surface side from the back surface side.

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 which support a journal portion of the crankshaft, each half bearing comprising crush reliefs formed adjacent to both circumferential end portions of an inner circumferential surface thereof;
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
at least the thrust relief on a rear side in a rotational direction of the crankshaft 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.

11. The bearing device according to claim 10 , wherein at least the thrust relief on the rear side in the rotational direction of the crankshaft 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.

12. 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 adjacent to both circumferential end portions of an inner circumferential surface thereof;
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
at least the thrust relief on a rear side in a rotational direction of the crankshaft 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.

13. 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 to be 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

Assignees

• Daido Metal Co

Inventors

• Tanaka Shiho
• Ozawa Yoshihiro

Classifications

• F16C33/046

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

• F16C17/08

  for supporting the end face of a shaft or other member, e.g. footstep bearings · CPC title

• F16C2360/22

  Internal combustion engines · CPC title

• F16C9/02 Primary

  Crankshaft bearings · CPC title

• F16C17/04

  for axial load only · CPC title