CPC F04C 2/344 (2013.01) [F15B 11/17 (2013.01); F16H 57/0435 (2013.01); F16H 57/0441 (2013.01); F16H 61/0025 (2013.01); F16H 61/0031 (2013.01)] | 8 Claims |
1. A pump unit for clutch actuation, having a high-pressure port for clutch actuation, a low-pressure port for a lubricant flow, a single drive motor and a dual pump, which is driven by the drive motor and has a high-pressure outlet, which is connected to the high-pressure port with a high-pressure line, and a low-pressure outlet, which is connected to the low-pressure port with a low-pressure line, wherein a prefilling line which leads from the low-pressure line to the high-pressure line is provided,
wherein a check valve which blocks flow in a flow direction from the high-pressure line to the low-pressure line is provided in the prefilling line,
wherein the drive motor is an electric motor which can be driven in two directions of rotation and a control means controls the rotational speed of the drive motor, and in a normal operating state when the check valve is closed, the rotational speed of the drive motor is a rated rotational speed, while for prefilling purposes when the check valve is open, the rotational speed of the drive motor is temporarily increased.
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