Half bearing and sliding bearing

Patent metadata

Field	Value
Publication number	US-11261904-B2
Application number	US-202017034685-A
Country	US
Kind code	B2
Filing date	Sep 28, 2020
Priority date	Sep 30, 2019
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

A semi-cylindrical half bearing for a sliding bearing includes at least one axial groove formed on its inner circumferential surface that includes a smooth groove surface formed back away from the inner circumferential surface toward a radially outer side of the half bearing. The groove surface forms a convex curve toward the radially outer side in a cross-section perpendicular to the axial direction of the half bearing, and forms a straight line extending in the axial direction in a cross-section parallel to the axial direction. The half bearing further includes a plurality of axial narrow grooves formed on the groove surface so as to be back away from the groove surface toward the radially outer side, that extend in the axial direction of the half bearing.

First claim

The invention claimed is:

1. A half bearing having a semi-cylindrical shape and adapted to constitute a sliding bearing for supporting a crankshaft of an internal combustion engine, the half bearing comprising at least one first axial groove formed on an inner circumferential surface thereof, the at least one first axial groove comprising a groove surface formed back away from the inner circumferential surface toward a radially outer side of the half bearing, the groove surface defining a convex curve toward the radially outer side in a cross-section perpendicular to an axial direction of the half bearing and defining a straight line extending in the axial direction in a cross-section parallel to the axial direction, wherein
the half bearing further comprises a plurality of second axial grooves formed on the groove surface, the plurality of second axial grooves extending in the axial direction of the half bearing.

2. The half bearing according to claim 1 , wherein a depth of the at least one first axial groove from the inner circumferential surface is 2 to 50 μm.

3. The half bearing according to claim 2 , wherein a depth of each second axial groove from the groove surface is 0.3 to 10 μm, the width of each second axial groove on the groove surface is 10 to 150 μm, and a pitch of the plurality of second axial grooves is 10 to 200 μm.

4. The half bearing according to claim 1 , wherein the at least one first axial groove comprises a plurality of first axial grooves, and the plurality of first axial grooves are formed on the inner circumferential surface.

5. The half bearing according to claim 4 , wherein the plurality of first axial grooves are formed substantially at equal intervals in the circumferential direction.

6. The half bearing according to claim 1 , wherein the at least one first axial groove does not open at any axial end surface of the half bearing.

7. A cylindrical sliding bearing for supporting a crankshaft of an internal combustion engine, comprising a first half bearing and a second half bearing, wherein the first half bearing is the half bearing according to claim 1 .

8. The sliding bearing according to claim 7 , wherein the second half bearing is the half bearing according to claim 1 .

9. The half bearing according to claim 1 , wherein the plurality of second axial grooves are formed on the groove surface away from the inner circumferential surface of the half bearing.

Assignees

• Daido Metal Co

Inventors

• Ito Ryota
• Amano Seiji
• GOTO Shiho

Classifications

• F16C9/02 Primary

  Crankshaft bearings · CPC title

• F16C33/1065

  Grooves on a bearing surface for distributing or collecting the liquid · CPC title

• F16C2240/42

  Groove sizes · CPC title

• F16C2360/22

  Internal combustion engines · CPC title

• F16C17/026

  with helical grooves in the bearing surface to generate hydrodynamic pressure, e.g. herringbone grooves · CPC title