| 摘要 |
PROBLEM TO BE SOLVED: To satisfactorily cool a piston as well as lubricate lubrication parts in all operation regions without unnecessarily increasing the capacity of an oil pump. SOLUTION: A main line 10 and an oil jet line 11 are communicated with a main gallery 12 for supplying oil to lubrication parts 15, 16 and with an oil jet gallery 13 for supplying oil to an oil jet 17 which jets the oil to the piston 18, respectively. An oil control valve (OCV) 21 is arranged in both lines 10, 11. In a low rotation/high load operation region, the oil jet line 11 is opened and the main line 10 is throttled to increase the quantity ratio of oil to the oil jet gallery 13. In a high rotation/low load operation region, the main line 10 is opened and the oil jet line 11 is throttled to increase the quantity ratio of oil to the main gallery 12. Furthermore, in a low rotation/low load operation region and a high rotation/high load operation region, the quantity ratio of oil supplied to the oil jet line 11 is equal to that supplied to the main line 10. COPYRIGHT: (C)2005,JPO&NCIPI
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