Patent ID: 11859664
Assignee: SPM OIL & GAS INC.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 8:
9. A pinion shaft assembly for installation in a reciprocating pump, comprising:
a tubular member having first and second ends and at least one bearing surface positioned adjacent the first end of the tubular member and 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 coupled to the first end of the tubular member via 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 of the interference coupling extension within the first end of the tubular member such that rotation between the first pinion gear member and the tubular member is substantially prevented; and
a second pinion gear member coupled to the second end of the tubular member via 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 of the interference coupling extension within the second end of the tubular member such that rotation between the second pinion gear member and the tubular member is substantially prevented,
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.