Device for preventing return of oil through fixed displacement pump of transmission of parallel hybrid vehicle, has free-wheel integrated in drive of pump, and torque emerging on pressure side by hydraulic pressure supported at housing

摘要

The device has a free-wheel (11) integrated in a drive of a fixed displacement pump (2). The free-wheel is blocked in a forward direction and rotates freely during rearward rotation of the pump. Another free-wheel (12) is integrated in the drive of the pump, and blocks between a non movable component and a pump shaft (31) when the shaft rotates rearward to avoid rearward rotation of the pump by pressure of hydraulics. Torque emerging on a pressure side of the pump by the hydraulic pressure is supported at a housing of the pump, where the pump is driven by a spur gear stage or a chain drive.