US 11,753,969 B2
Recirculating hydraulic fluid control valve
Gustavo de Oliveira Figueiredo, Sterling Heights, MI (US); and Andrew Mlinaric, Lakeshore (CA)
Assigned to Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
Filed by Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
Filed on Jan. 4, 2021, as Appl. No. 17/140,172.
Claims priority of provisional application 62/958,747, filed on Jan. 9, 2020.
Prior Publication US 2021/0215070 A1, Jul. 15, 2021
Int. Cl. F01L 1/344 (2006.01); F01L 1/047 (2006.01); F15B 13/02 (2006.01)
CPC F01L 1/3442 (2013.01) [F01L 1/047 (2013.01); F15B 13/021 (2013.01); F01L 2001/3443 (2013.01); F01L 2001/34423 (2013.01); F01L 2001/34426 (2013.01); F01L 2001/34433 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A hydraulic fluid control valve, comprising:
a housing having:
a first fluid port configured to be fluidly connected to a first hydraulic actuation chamber; and,
a second fluid port configured to be fluidly connected to a second hydraulic actuation chamber, the first hydraulic actuation chamber and the second hydraulic actuation chamber configured to receive and exit hydraulic fluid; and,
a spool disposed at least partially within the housing, the spool having:
a vent aperture;
a first aperture;
a second aperture; and,
a third aperture; and,
the first aperture, the second aperture, and the third aperture are configured to move in unison; and,
each of the first aperture, the second aperture, and the third aperture are continuously fluidly connected to each other; and,
in a first axial position of the spool:
the first aperture is configured to receive hydraulic fluid from the first hydraulic actuation chamber;
the second aperture is configured to deliver a first portion of the hydraulic fluid from the first hydraulic actuation chamber to the second hydraulic actuation chamber; and,
the vent aperture is configured to exit a second portion of the hydraulic fluid from the first hydraulic actuation chamber; and,
in a second axial position of the spool:
the third aperture is configured to receive hydraulic fluid from the second hydraulic actuation chamber;
the second aperture is configured to deliver a first portion of the hydraulic fluid from the second hydraulic actuation chamber to the first hydraulic actuation chamber; and,
the vent aperture is configured to exit a second portion of the hydraulic fluid from the second hydraulic actuation chamber.