| 摘要 |
PROBLEM TO BE SOLVED: To stably lubricate a piston pin of an engine. SOLUTION: A structure connecting a piston 10 and a connecting rod 20 by a full floating type piston pin 30 is applied to the engine. An oil passage 21 for lubricating oil penetrating from a large end part 25 to a small end part 22 is provided inside of the connecting rod 20 and an annular supply groove 24 for lubricating oil is provided in vicinity of a center part. The piston pin 30 is made of a hollow member, and an introductory hole 31 and a lubrication hole 32 are provided in the vicinity of the center part and in the vicinity of both ends respectively. A bowl shaped plug 13 is inserted on an outer end part of a piston boss 11 respectively. Lubricating oil is introduced to the inside of the piston pin 30 via the oil passage 21 of the connecting rod 20 and the introductory hole 31, and floods out of opening parts of both ends or the lubrication hole 32, and stays in a space blocked by the bowl shaped plug 13. Consequently, stable lubrication of a contact surface of the piston pin 30 with the piston boss 11 is secured. COPYRIGHT: (C)2005,JPO&NCIPI
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