| 摘要 |
PROBLEM TO BE SOLVED: To prevent bearing seizure or abnormal abrasion at a piston pin bearing part to improve reliability even in severe high-compression ratio operation or HFC cooling medium environments. SOLUTION: In a housing 6g of a small end side bearing cylinder part, a circumferential recessed groove 6f communicating with a fourth oil passage 6c is provided. A fifth oil passage is provided as formed of the circumferential recessed groove 6f and the housing 6g. The fifth oil passage communicates with a plurality of grooves 11 provided lengthwise of a bearing on the inner surface load side of the housing 6g. The grooves 11 are set as deflected for a similar angular pitch to the maximum swing angle θ of a con'rod 6A around a cylinder center axis of the small end side bearing cylinder part. Both lengthwise ends of the groove are opened, and to one opening position, the other opening position is deflected for over the pitch similar to the maximum swing angle θ to make a multi-spiral form. COPYRIGHT: (C)2004,JPO
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