Oil pressure supply device for vehicle drive system

摘要

An engine (1) and a motor (26) are connected to the drive wheels of a vehicle via an automatic transmission (30). The drive wheels are driven using one of or both of the motor and the engine depending on the running state. The automatic transmission varies the drive ratio by the discharge pressure of the oil pressure pump (51). The oil pressure pump is driven by a second motor (50). When the automatic transmission is varying the drive ratio, the discharge of the oil pressure pump is increased by increasing the rotational speed of the second motor and thus the required oil for varying the drive ratio is maintained.