US 12,234,754 B2
Camshaft adjuster with reset function
Volker Schmidt, Burgbernheim (DE); Juergen Weber, Erlangen (DE); and Thomas Werblinski, Furth (DE)
Assigned to Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
Appl. No. 18/689,908
Filed by Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
PCT Filed Aug. 10, 2022, PCT No. PCT/DE2022/100587
§ 371(c)(1), (2) Date Mar. 7, 2024,
PCT Pub. No. WO2023/036356, PCT Pub. Date Mar. 16, 2023.
Claims priority of application No. 102021123114.0 (DE), filed on Sep. 7, 2021.
Prior Publication US 2024/0426229 A1, Dec. 26, 2024
Int. Cl. F01L 1/344 (2006.01); F01L 1/46 (2006.01)
CPC F01L 1/3442 (2013.01) [F01L 1/46 (2013.01); F01L 2001/34426 (2013.01); F01L 2001/3443 (2013.01); F01L 2001/34433 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A hydraulic camshaft adjuster for adjusting a phase position of a camshaft relative to a crankshaft in a motor vehicle drive train, the hydraulic camshaft adjuster comprising:
a stator,
a rotor configured to rotate relative to the stator within a predetermined angular range, and
a hydraulic supply system configured to control the relative rotation of the rotor, the hydraulic supply system including:
a first working channel,
a second working channel,
a first switching valve configured to switch between (i) a first switching position in which the first working channel and the second working channel are respectively connected to a pressurizing pump and a pressure relieving reservoir, and (ii) a second switching position in which the second working channel and the first working channel are respectively connected to the pressurizing pump and the reservoir, and
a return pump actuated via a switching movement of the first switching valve, the return pump configured to pressurize one working channel of the first and second working channels so as to return the rotor to a predetermined rotational position relative to the stator.