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1. (WO2018160234) PISTON CARTRIDGE FOR PISTON PUMP

Pub. No.:    WO/2018/160234    International Application No.:    PCT/US2017/059895
Publication Date: Sat Sep 08 01:59:59 CEST 2018 International Filing Date: Sat Nov 04 00:59:59 CET 2017
IPC: F04B 53/16
F04B 15/08
F04B 9/109
F04B 23/02
F04B 1/12
F04B 53/14
Applicants: CATERPILLAR INC.
Inventors: BEAN, Sunil, J.
BROWN, Cory, A.
Title: PISTON CARTRIDGE FOR PISTON PUMP
Abstract:
A hydraulic piston pump (100) includes a piston (128) disposed in a blind housing bore (150) of a piston housing (124) and that reciprocates to generate a pumping action. To accommodate the piston (128), a piston cartridge (170) is installed in each of the housing bores (150). The piston cartridge (170) includes a piston sleeve (172) having an inner sleeve periphery (184), a first outer sleeve periphery (190), and a second outer sleeve periphery (192). The inner sleeve periphery (184) is configured to establish sliding contact with the piston (128). The first outer sleeve periphery (190) has a first outer sleeve diameter (194) that is larger than a second outer sleeve diameter (196) associated with the second outer sleeve periphery (192). To seal against the blind housing bore (150), a liner cap (174) having a cylindrical liner wall (210) and an axial liner cover (212) is disposed over the first outer sleeve periphery (190). The axial liner cover (212) abuts a housing bore ceiling (160) of the blind housing bore (150) and can receive hydraulic fluid there through.