Abstract: Axial piston fluid translating units commonly experience undesirable shaft deflections and barrel tilting during operation. A fluid translating unit includes a barrel plate interposed the end of a barrel and a porting surface defined within a housing thereof. The barrel plate is axially spaced from an end of the barrel and is in face sealing engagement with the porting surface. The barrel plate defines a plurality of fluid ports, each communicating between one of a plurality of barrel cylinder bores and the porting surface. In one aspect a plurality of counterbores are provided in the barrel in surrounding relation to the fluid ports. A plurality of seal rings having a sealing end defining an annular seal face of a predetermined width for face sealing engagement with the barrel plate. The seal rings are each disposed in one of the counterbores in circumferential sealing relation of a predetermined length which is no greater than the width of the sealing face.

Abstract: Hydraulic piston pumps and motors are used in various applications to power implements, steering, propel, and auxiliary systems. However, it is important to keep the piston weight and compressible fluid volume low in order to have a smaller more efficient pump. The subject piston is manufactured in a simple manner to achieve a reliable, light weight design. The piston has a cylindrical body having an outer surface. The piston is manufactured by forming a first bore having a large diameter in the body extending from the outer surface and terminating at an annular shoulder. A second bore is formed which extends from the annular shoulder to a predetermined depth. A tube is inserted through the bore and extends a predetermined distance into the second bore. A cap has a bore and is positioned on the body in abutment with at least a portion of the outer surface. The cap slidably receives the tube through the bore.

Abstract: A radial piston pump comprises a housing having a drive shaft rotatably mounted therein and a pair of longitudinally spaced pumps each having a rotor thereof operatively connected to the shaft for rotation therewith. Each pump further comprises a pintle valve mounted in the housing and having a respective rotor rotatably mounted thereon for communicating fluid from an inlet of the housing to an outlet thereof. Each pump further comprises a plurality of circumferentially spaced and radially extending pistons secured thereon with each of the pistons having a cylinder reciprocally mounted on an end thereof for pumping fluid from the inlet to the outlet upon rotation of the rotor which is mounted in eccentric relationship relative to a chamber formed in the housing.