US 12,258,960 B2
Keyless gear timing assembly for a reciprocating pump
Chandu Kumar, Fort Worth, TX (US); Jeffrey Haiderer, Fort Worth, TX (US); and Connor Landrum, Burleson, TX (US)
Assigned to SPM Oil & Gas Inc., Fort Worth, TX (US)
Appl. No. 18/040,018
Filed by SPM Oil & Gas Inc., Fort Worth, TX (US)
PCT Filed Aug. 10, 2021, PCT No. PCT/US2021/045400
§ 371(c)(1), (2) Date Jan. 31, 2023,
PCT Pub. No. WO2022/035870, PCT Pub. Date Feb. 17, 2022.
Claims priority of provisional application 63/063,579, filed on Aug. 10, 2020.
Prior Publication US 2023/0304483 A1, Sep. 28, 2023
Int. Cl. F04B 9/02 (2006.01); F16D 1/06 (2006.01)
CPC F04B 9/02 (2013.01) [F16D 1/06 (2013.01); F16D 2001/062 (2013.01); F16D 2300/12 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An assembly for securing a bull gear to a crankshaft of a power end of a reciprocating pump assembly, the assembly comprising:
the crankshaft configured to drive one or more plungers in a fluid end of the reciprocating pump assembly,
a first bull gear connected to a first end of the crankshaft and a second bull gear connected to a second and opposed end of the crankshaft, wherein the second bull gear is connected to the crankshaft using a key, and
a pinion shaft mechanically coupled to the first bull gear and the second bull gear via first and second pinion gears, respectively, the pinion shaft operable to rotate the pinion gears, and in turn, rotate the first and second bull gears to rotate the crankshaft,
a keyless timing gear assembly comprising:
at least one actuator;
an expansion member; and
at least one wedge member disposed between the at least one actuator and the expansion member, the wedge member having a sloped surface to slideably engage a corresponding sloped surface on the expansion member such that in response to actuation of the at least one actuator, the at least one wedge member exerts a force on the expansion member for securing the first bull gear to the crankshaft.