| 摘要 |
PROBLEM TO BE SOLVED: To suppress occurrence of abnormal noise immediately after an oil pump is driven due to intrusion of air taken in an oil chamber of a relief valve at stop of an oil pump.SOLUTION: The device is provided with a control part 34 which takes a relief oil pressure as a low pressure side relief oil pressure by communicating an oil chamber 60 at one end of a relief valve 23 to a supply passage 12 via a second control passage 36 and a third control passage 44 when engine rotation speed is less than a switch rotation speed; and as high pressure side by communicating the oil chamber 60 to a supply passage 12 via a first control passage 24 and the third control passage 44 when engine rotation speed is not less than the switch rotation speed. While a control condition is established at engine start in which engine rotation is less than switch rotation speed, a switch valve 26 is controlled so as to open the oil chamber 60 to the outside via a drain passage 38, a second control passage 36 and third control passage 44. |
