US 12,005,769 B2
Hydraulic arrangement and electrically operable, multigear axle drive train
Marco Grethel, Bühlertal (DE); and Carsten Mayer, Lohr a. Main (DE)
Assigned to Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
Appl. No. 18/266,858
Filed by Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
PCT Filed Oct. 8, 2021, PCT No. PCT/DE2021/100815
§ 371(c)(1), (2) Date Jun. 13, 2023,
PCT Pub. No. WO2022/127966, PCT Pub. Date Jun. 23, 2022.
Claims priority of application No. 10 2020 133 343.9 (DE), filed on Dec. 14, 2020; and application No. 10 2021 104 151.1 (DE), filed on Feb. 22, 2021.
Prior Publication US 2024/0100928 A1, Mar. 28, 2024
Int. Cl. B60K 1/00 (2006.01); B60K 17/10 (2006.01); F16H 61/00 (2006.01)
CPC B60K 1/00 (2013.01) [B60K 17/105 (2013.01); F16H 61/0009 (2013.01); F16H 61/0031 (2013.01); B60K 2001/001 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A hydraulic arrangement for an electrically operable, multigear axle drive train of a motor vehicle, comprising:
a hydraulic circuit in which a hydraulic fluid is guided,
at hydraulic pump arranged to apply pressure to the hydraulic fluid within the hydraulic circuit,
a first hydraulic path arranged to connect a first clutch device to the hydraulic circuit, and
a second hydraulic path arranged to connect a second clutch device to the hydraulic circuit,
wherein the first and second clutch devices are each arranged to actuate a gear selection device of the electrically operable axle drive train,
wherein the first hydraulic path has a first non-return valve arranged to connect to the hydraulic circuit and a first switching valve connected downstream in the first hydraulic path,
wherein a third hydraulic path engaging between the first switching valve and the first clutch device connects the first hydraulic path to the hydraulic circuit,
wherein the second hydraulic path has a second non-return valve arranged to connect to the hydraulic circuit and a second switching valve connected downstream in the second hydraulic path,
wherein a fourth hydraulic path engaging between the second switching valve and the second clutch device connects the second hydraulic path to the hydraulic circuit,
wherein a passive bypass valve is arranged in at least one of the third hydraulic path or the fourth hydraulic path.