US 11,719,207 B2
Pump plunger assembly for improved pump efficiency
Donald J. Benson, Columbus, IN (US); Bela Doszpoly, Columbus, IN (US); Eric A. Benham, Columbus, IN (US); Ahmad M. Sabri, Columbus, IN (US); and Richard E. Duncan, Greenwood, IN (US)
Assigned to Cummins Inc., Columbus, IN (US)
Appl. No. 17/778,590
Filed by Cummins Inc., Columbus, IN (US)
PCT Filed Nov. 22, 2019, PCT No. PCT/US2019/062777
§ 371(c)(1), (2) Date May 20, 2022,
PCT Pub. No. WO2021/101566, PCT Pub. Date May 27, 2021.
Prior Publication US 2022/0412297 A1, Dec. 29, 2022
Int. Cl. F02M 59/44 (2006.01); F02M 59/02 (2006.01)
CPC F02M 59/442 (2013.01) [F02M 59/02 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A fuel pump comprising:
a barrel including a bore;
a plunger movable inside the bore, the plunger having a proximal end and a distal end, the proximal end including a cavity that defines a depressed volume within the plunger; and
a volume filler disposed in the cavity, the volume filler being constrained in the cavity by a retaining element, wherein the volume filler includes a passage that extends along an entire axial length of the volume filler.