US 12,240,304 B2
Apparatus for supplying fluid to an electric drive train
Philipp Beierer, Munich (DE); Thomas Reiter, Munich (DE); Tim Schnädelbach, Pottenstein (DE); and Christian Kohrs, Plochingen (DE)
Assigned to MAN Truck & Bus SE, Munich (DE)
Appl. No. 18/025,848
Filed by MAN Truck & Bus SE, Munich (DE)
PCT Filed Aug. 24, 2021, PCT No. PCT/EP2021/073403
§ 371(c)(1), (2) Date Mar. 10, 2023,
PCT Pub. No. WO2022/053308, PCT Pub. Date Mar. 17, 2022.
Claims priority of application No. 102020123590.9 (DE), filed on Sep. 10, 2020.
Prior Publication US 2023/0331076 A1, Oct. 19, 2023
Int. Cl. F01M 1/12 (2006.01); B60K 1/00 (2006.01); B60K 11/02 (2006.01); F16N 7/40 (2006.01)
CPC B60K 1/00 (2013.01) [B60K 11/02 (2013.01); F16N 7/40 (2013.01); B60K 2001/006 (2013.01); F01M 2001/123 (2013.01); F16N 2210/04 (2013.01)] 21 Claims
OG exemplary drawing
 
1. Device for supplying fluid to an electric drive train for a motor vehicle comprising
a main pump configured as a hydraulic fixed displacement pump for delivering fluid from a fluid reservoir to an electric drive train; and
at least one auxiliary pump configured as a hydraulic fixed displacement pump,
wherein the main pump and the auxiliary pump are mechanically driven by a transmission of the electric drive train in such a way that a fixed transmission ratio exists between a pumping rotation speed of the main pump and a pumping rotation speed of the auxiliary pump, and wherein the auxiliary pump can be selectively connected by means of a controllable actuating device for supplying fluid to the electric drive train,
wherein the main pump is fluidically connected to the electric drive train via a supply line and the auxiliary pump is arranged in an auxiliary line, wherein the auxiliary line can be fluidically connected to the supply line by means of the controllable actuating device in order to connect the auxiliary pump for supplying fluid to the electric drive train,
wherein a first suction line branches off from the supply line downstream of the main pump and opens into the fluid reservoir, wherein
a) a first suction valve is arranged in the first suction line for preventing an underpressure at the main pump, and
b) fluid is supplied to the main pump via the first suction line during a direction of rotation of the transmission corresponding to a reverse drive mode of a motor vehicle.