Patent ID: 7364409
Filing Date: 2008-04-29
Classification: F04B

Abstract:
1. A hydraulic machine comprising a housing, a rotating group rotatably mounted within said housing and including a barrel and a plurality of piston assemblies axially slideable in cylinders in said barrel, and a swashplate assembly to engage said piston assemblies and induce reciprocation thereof as said barrel rotates in said housing, a port plate interposed between said barrel and said housing and effective to connect respective ones of said cylinders alternatively with an inlet port and an outlet port, each of said piston assemblies having a piston and a slipper assembly acting between said swashplate and said piston to transfer loads therebetween said slipper assembly including a base having a planar bearing surface engagable with said swashplate and a spherical bearing on an oppositely directed side and engagable with a part spherical recess in said piston said base including a spigot projecting from said oppositely directed side and said spherical bearing having a through bore to receive said spigot, said through bore having a counterbore of greater diameter than said through bore at an end thereof remote from said base to permit enlargement of said spigot to retain said spherical bearing on said spigot.