ROLLING BEARING FOR CRANK JOURNAL

摘要

PROBLEM TO BE SOLVED: To provide a rolling bearing for a crank journal which reduces a feeding pressure of lubricant thereto and consequently reduces a pressure of lubricant within the bearing while ensuring the good lubrication of the bearing, thereby decreasing stir resistance of the lubricant within the bearing.

SOLUTION: The rolling bearing 22 for a crank journal has an outer ring 32 surrounding a crank journal 16 fixed to a cylinder block 12 and a plurality of rollers 36 received within a circumferential groove 34 provided on an inner face of the outer ring to contact the crank journal. An oil feeding channel 44 is provided on an outer face 32b of the outer ring 32 extending to an end face 32c of the outer ring. The oil feeding channel is communicated with an inner oil-feeding passage 42 provided in the cylinder block 12 and the lubricant is fed to circumferences of the rollers 36 from the inner oil-feeding passage through the oil feeding channel 44, a space between the end face 32c of the outer ring and a boss portion 18A of the crank arm 18, and a space between an inner face 32a of the outer ring and the crank journal 16.

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