| 摘要 |
<P>PROBLEM TO BE SOLVED: To stably supply sufficient oil to sliding surfaces of crank pins in a high-rotation range from a low-rotation range of an engine and in a region in which oil is varied in temperature to a low temperature from a high temperature. <P>SOLUTION: This oil passage structure comprises a crank shaft (33) swingingly connected to a connecting rod (38) and a plurality of journal walls (312) for rotatably supporting the crank shaft by a plurality of journals (333) in a cylinder block (31), first oil passages (331) for supplying oil to sliding surfaces of a plurality of the crank pins (332) from openings (336) formed at one end face (335) are formed at the crank shaft (33), second oil passages (313) for supplying oil to sliding surfaces of the respective crank journals are formed at the plurality of journal walls, and the first oil passages and the second oil passages communicate with each other in a portion of the journal walls and the crank journals. <P>COPYRIGHT: (C)2013,JPO&INPIT |
