| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To rise oil temperature without increase of exhaust resistance and without change of an exhaust system layout, and to suppress excessive cooling of objects to be fueled to promote warmth. <P>SOLUTION: An oil circulation system 1 of an engine includes: a plurality of objects 8, 10, 11, 13 and 14 to be fueled; an oil pump 6, a plurality of branch oil supply passages 32, 33, 41 and 42; and four head side drain oil passages 44 that can reflux oil from the plurality of objects to be fueled to an inner oil pan 2b. A bypass passage 15, branching off from a second branch oil supply passage of the plurality of branch oil supply passages, includes: a bypass passage including four exhaust port side oil passages 48 which are provided near exhaust ports 4a of a cylinder head 4 and direct the oil to the head side drain oil passages 44; and a switching valve 16 provided in the bypass passage, which opens when the engine is in the condition of warmth and closes after the condition of the warmth. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
