US 11,680,564 B1
Hydraulic gear pump with radial pressure compensator
Hao Zhang, Twinsburg, OH (US); Satish Kumar Raju Kalidindi, Mayfield Heights, OH (US); and Yu-Sen Chu, Westlake, OH (US)
Assigned to Parker-Hannifin Corporation, Cleveland, OH (US)
Filed by Parker-Hannifin Corporation, Cleveland, OH (US)
Filed on Oct. 19, 2022, as Appl. No. 17/968,998.
Application 17/968,998 is a continuation of application No. 16/951,480, filed on Nov. 18, 2020, granted, now 11,506,200.
Claims priority of provisional application 62/982,310, filed on Feb. 27, 2020.
This patent is subject to a terminal disclaimer.
Int. Cl. F04C 14/24 (2006.01); F04C 2/10 (2006.01); F04C 15/00 (2006.01)
CPC F04C 14/24 (2013.01) [F04C 2/101 (2013.01); F04C 15/0026 (2013.01); F04C 2240/80 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An assembly comprising:
an outer crescent of a gear pump;
an inner crescent of the gear pump, wherein the outer crescent comprises a first axial groove, and wherein the inner crescent further comprises a second axial groove facing the first axial groove, forming a shuttle check valve cavity therebetween; and
a shuttle check pin disposed in the shuttle check valve cavity and configured to preclude leakage fluid flow between the outer crescent and the inner crescent (i) in a first direction during operation of the gear pump in a first rotational direction, and (ii) in a second direction, opposite the first direction, during operation of the gear pump in a second rotational direction, opposite the first rotational direction.
 
17. A method comprising:
mating an outer crescent of a gear pump with an inner crescent of the gear pump, wherein the outer crescent comprises a first axial groove, wherein the inner crescent further comprises a second axial groove facing the first axial groove to form a shuttle check valve cavity therebetween; and
inserting a shuttle check pin in the shuttle check valve cavity, wherein the shuttle check pin is configured to preclude leakage fluid flow between the outer crescent and the inner crescent (i) in a first direction during operation of the gear pump in a first rotational direction, and (ii) in a second direction, opposite the first direction, during operation of the gear pump in a second rotational direction, opposite the first rotational direction.