Patent ID: 8408799
Filing Date: 2013-04-02
Classification: F16C

Abstract:
1. A bearing for a connecting rod of an internal combustion engine for rotatably supporting a crankpin of crank shaft including therein an interior lubrication oil path, the connecting rod including a main body and a cap so that the bearing is surrounded and supported by the main body and the cap, the bearing comprising, a first semi-cylindrical bearing part arranged on the main body and a second semi-cylindrical bearing part arranged on the cap, wherein each of the first and second semi-cylindrical bearing parts has a wall thickness decreasing region of an inner surface thereof extending circumferentially from an axial whole length of a boundary between the first and second semi-cylindrical bearing parts to operate as a crush relief, and the first semi-cylindrical bearing part is arranged to align a circumferentially central portion of a semi-cylindrical cross section thereof with a central axis of the connecting rod, wherein the wall thickness decreasing region of each of the first and second semi-cylindrical bearing parts has a first slant surface extending circumferentially from a central portion of the axial whole length of the boundary and a second slant surface extending circumferentially from each of axial side portions of the axial whole length of the boundary, wherein the axial side portions are arranged between the central portion and each side portion extends to one of axial ends of the axial whole length of the boundary, so that a first axial oil groove formed on the first slant surfaces and a second axial oil groove formed on the second slant surfaces communicate fluidly with each other, a cross sectional area of the first axial oil groove along an imaginary plane passing between the first and second axial oil grooves in a direction perpendicular to an axial direction of the bearing is greater than a cross sectional area of the second axial oil groove along the imaginary plane, a height of a farthermost end of the first slant surface from another imaginary plane passing both of each of the first and second semi-cylindrical bearing parts in a direction parallel to the axial direction of the bearing is not less than ¼ of a diameter of an outlet opening of the interior lubrication oil path on an outer peripheral surface of the crankpin and less than ½ of the diameter, an axial length of the first slant surface is more than the diameter and has an axial distance not less than 2 mm from each of the axial ends, the height of the farthermost end of the first slant surface is smaller than a height of a farthermost end of the wall thickness decreasing region from the another imaginary plane, and an axial central point of the first axial oil groove is aligned with an axial central point of the outlet opening.