US 11,719,239 B2
Pump unit for clutch actuation
Christian Sperber, Ebern (DE); Wilhelm Heubner, Ebern (DE); Patrick Gegner, Ebern (DE); Alexander Lehnert, Ebern (DE); Frank Sauerteig, Ebern (DE); and Benjamin Wuechner, Ebern (DE)
Assigned to FTE AUTOMOTIVE GmbH, Ebern (DE)
Filed by FTE AUTOMOTIVE GmbH, Ebern (DE)
Filed on Sep. 21, 2021, as Appl. No. 17/480,742.
Claims priority of application No. 10 2020 127 070.4 (DE), filed on Oct. 14, 2020.
Prior Publication US 2022/0112906 A1, Apr. 14, 2022
Int. Cl. F04C 2/344 (2006.01); F16H 61/00 (2006.01); F15B 11/17 (2006.01); F16H 57/04 (2010.01)
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
OG exemplary drawing
 
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.