| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent oil with air sucked from being circulated in a path including a hydraulic operation section, in an oil pump hydraulic circuit including a main pump and a sub-pump which are juxtaposed to each other and supplying oil to the hydraulic operation section or the like. <P>SOLUTION: Since oil returned from a cooler bypass circulation passage 40 through a cooler bypass valve 38 opened when a temperature is lowered is returned to an oil passage 12a from which only the sub-pump 12 can perform suction, a possibility that oil with air mixed is made to flow into a lock-up main oil passage 10e is considerably low. Even if the oil is made to flow into the lock-up main oil passage 10e from the other route, when the oil flows through a lubricating element 32, air is separated from the oil when the oil is returned to an oil pan 18. Therefore, oil with air mixed is prevented from being circulated through a torque converter 2 including a lock-up clutch 4, and the torque converter 2 does not cause a malfunction. <P>COPYRIGHT: (C)2011,JPO&INPIT |
