Commercial Shearing, Inc.

David L Mauch

An axial piston pump is disclosed which includes a housing, a cylindrical bore in the housing, a piston barrel rotatable in the bore and spaced from the bore walls and an antifriction bearing structure surrounding the barrel between the barrel and the bore. A plurality of axial piston are provided in the barrel which are open at one end and have fluid passages through the barrel at the other end. A piston is provided in each such piston bore which extends out of the open end. A spring is provided between each piston and the other end of the piston bore. A fixed ramp swash plate is provided in the housing bore beneath the extending pistons and an antifriction thrust bearing is provided between the swash plate and pistons. An axial drive shaft is provided on the barrel which extends through an antifriction bearing in an opening in the housing opposite the bore for drivingly engaging on external drive structure. Additionally, a removable port cap is provided on the housing over the bore which has inlet and outlet ports communicating with fluid passages in the barrel.

Axial piston pumps and motors

A swash plate pump or motor is provided having a swivel plate surrounding the slippers and a positive hold down ring connected to the swash plate and bearing on said swivel plate to maintain it at a fixed distance from the slipper plate, said hold down ring having a series of successive controlled wedge angles on the face bearing on the swivel plate and oil feed means connected to each wedge angle whereby a hydrodynamic force is created holding the swivel plate and hold down ring apart.

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Bordman, OH, United States of America

David L Mauch