US 12,264,603 B2
Camshaft phaser having non-return valves
Branimir Karic, Erlangen (DE)
Assigned to Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
Appl. No. 18/708,610
Filed by Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
PCT Filed Nov. 11, 2022, PCT No. PCT/DE2022/100841
§ 371(c)(1), (2) Date May 9, 2024,
PCT Pub. No. WO2023/088515, PCT Pub. Date May 25, 2023.
Claims priority of application No. 10 2021 130 311.7 (DE), filed on Nov. 19, 2021.
Prior Publication US 2025/0027432 A1, Jan. 23, 2025
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); F01L 2001/34446 (2013.01); F01L 2001/34483 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A camshaft phaser for adjusting a phase position between a crankshaft and a camshaft of a motor vehicle, the camshaft phaser comprising:
a stator,
a rotor configured to rotate relative to the stator, the rotor including a plurality of blades,
a plurality of working chambers formed between the stator and the rotor, the plurality of blades respectively dividing each working chamber into a first sub-chamber and a second sub-chamber which are configured to receive hydraulic fluid so as to rotate the rotor relative to the stator, and
a reservoir configured to store the hydraulic fluid, the reservoir fluidly connected to:
i) each first sub-chamber via a respective first non-return valve so as to feed the hydraulic fluid to each first sub-chamber when a negative pressure is present in each first sub-chamber, and p2 ii) each second sub-chamber via a respective second non-return valve so as to feed the hydraulic fluid to each second sub-chamber when a negative pressure is present in each second sub-chamber,
wherein selected non-return valves are preloaded, the selected non-return valves including:
each first non-return valve being preloaded so as to remain closed until the negative pressure in each first sub-chamber decreases below a predetermined negative pressure thereby opening each first non-return valve, and/or
each second non-return valve being preloaded so as to remain closed until the negative pressure in each second sub-chamber decreases below the predetermined negative pressure thereby opening each second non-return valve,
wherein the predetermined negative pressure corresponds to a saturation pressure of the camshaft phaser.