US 12,467,439 B1
Piston pump and method of manufacturing the same
Nebojša Dimitrijević, Užice (RS)
Filed by Nebojša Dimitrijević, Užice (RS)
Filed on Mar. 3, 2025, as Appl. No. 19/069,120.
Application 19/069,120 is a continuation of application No. 18/658,876, filed on May 8, 2024, granted, now 12,270,395.
Int. Cl. F04B 9/04 (2006.01); F04B 1/0404 (2020.01); F04B 1/0408 (2020.01); F04B 1/0531 (2020.01); F04B 1/0538 (2020.01); F04B 53/14 (2006.01)
CPC F04B 9/042 (2013.01) [F04B 1/0404 (2013.01); F04B 1/0408 (2013.01); F04B 1/0531 (2013.01); F04B 1/0538 (2013.01); F04B 53/14 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A piston pump with near-circular cam design for improved longevity and efficiency, the piston pump comprising:
a rotatably mounted crankshaft having
a longitudinally extending crankshaft rotation axis, and
one or more near-circular cams distributed along the crankshaft axis, each near-circular cam having
one or more cam noses and one or more cam heels, the cam noses circumferentially alternating with the cam heels around the crankshaft axis, the cam noses all having a nose radius, the cam heels all having a heel radius, the nose radius being greater than the heel radius,
a cam stroke length that is a difference between the nose radius and the heel radius, and
a ratio of the nose radius to the heel radius of greater than 1 and less than 1.35; and
one or more pistons, each piston in contact with a corresponding near-circular cam of the one or more near-circular cams, each piston slidably mounted relative to the crankshaft between a nose position when in contact with the cam nose of the corresponding near-circular cam, and a heel position when in contact with the cam heel of the corresponding near-circular cam.