Title:
MAIN BEARING FOR CRANK SHAFT OF INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP2019124234
Kind Code:
A
Abstract:
To provide a main bearing capable of reducing frictional loss by contact with a journal portion in operating an internal combustion engine.SOLUTION: According to the present invention, a main bearing is provided in that the main bearing for rotatably supporting a journal portion of a crank shaft of an internal combustion engine has a pair of upper half-split bearing and a lower half-split bearing forming the cylindrical shape by being combined with each other, each half-split bearing has a main cylindrical portion including a circumferential central portion of the half-split bearing, the main cylindrical portion has a sliding face at a radial inner side, further each half-split bearing has crash reliefs having a thin wall thickness in comparison with the main cylindrical portions, at both sides in the circumferential direction of the sliding face, only the upper half-split bearing has an oil groove extended in the circumferential direction on its inner peripheral face, the lower half-slit bearing has a projecting portion extended in an axial direction, on a sliding face between the circumferential central portion and the crash relief at a front side in the rotating direction of the journal portion, and the projecting portion is formed within a range of circumferential angles of 10-60° from the circumferential central portion toward a front side in a rotating direction.SELECTED DRAWING: Figure 4
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Inventors:
AMANO MASAHARU
WATANABE TORU
WATANABE TORU
Application Number:
JP2018003004A
Publication Date:
July 25, 2019
Filing Date:
January 11, 2018
Export Citation:
Assignee:
DAIDO METAL CO LTD
International Classes:
F16C9/02; F01M1/06; F16C9/04; F16C17/02; F16C33/10
Attorney, Agent or Firm:
Asamura patent office