US 11,859,664 B2
Multi-piece pinion shaft assembly
Daryl James Belshan, Weatherford, TX (US); Jacob Brown, Waller, TX (US); Sri Harsha Uddanda, Lafayette, IN (US); and Todd Ryan Kabrich, Tomball, TX (US)
Assigned to SPM Oil & Gas Inc., Fort Worth, TX (US)
Filed by SPM Oil & Gas, Inc., Fort Worth, TX (US)
Filed on Nov. 18, 2021, as Appl. No. 17/530,441.
Prior Publication US 2023/0151842 A1, May 18, 2023
Int. Cl. F16C 3/02 (2006.01); F16D 1/072 (2006.01); F16H 57/00 (2012.01)
CPC F16C 3/023 (2013.01) [F16D 1/072 (2013.01); F16H 57/0025 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A reciprocating pump having a power end and a fluid end, the pump comprising:
a pinion shaft assembly disposed in the power end, the pinion shaft assembly comprising:
a tubular member having an inner bore, first and second ends, and at least one bearing surface positioned adjacent the first end of the tubular member, the at least one bearing surface configured to receive at least one roller bearing;
a bearing shoulder positioned adjacent the at least one bearing surface of the tubular member;
a first pinion gear member having an interference coupling extension having an outside shape corresponding to an inside shape of the first end of the tubular member to achieve a tight friction fit therebetween such that rotation between the first pinion gear member and the tubular member is substantially prevented when the interference coupling extension is inserted within the first end of the tubular member; and
a second pinion gear member having an interference coupling extension having an outside shape corresponding to an inside shape of the second end of the tubular member to achieve a tight friction fit therebetween such that rotation between the second pinion gear member and the tubular member is substantially prevented when the interference coupling extension is inserted within the second end of the tubular member,
wherein the bearing shoulder has an outside diameter greater than an outside diameter of the at least one bearing surface and is configured to prevent movement of a bearing away from the first pinion gear member.