US 3,981,630 AGranted

Hydraulic swash plate pumps

OwnerGerard Leduc, Michel Leducinventors

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Abstract

A swash plate pump of the type wherein a plurality of pistons bear against the swash plate and are given a reciprocating movement when the plate is rotated by a drive shaft. The drive shaft comprises a solid portion and a hollow portion which latter constitutes a central admission conduit for the liquid to be pumped. The swash plate is mounted at the junction between the solid and hollow portions of the shaft, and the plate has an aperture which communicates with the central conduit and a crescent-shaped port for liquid distribution to the pistons. These pistons are arranged in a circle concentric with the solid shaft portion. A taper roller bearing is mounted on the hollow shaft portion and the front face of the swash plate bears against the roller bearing. The discharge flow of liquid can be divided for distribution into several separate flows by a cylindrical sleeve located on the solid shaft portion.

Claims12

Dependent claims

A swash plate pump of the type comprising a plurality of pistons bearing against a plate driven by a driving shaft, said plate being inclined relatively to said driving shaft in such a manner that the pistons are given a reciprocating movement when said plate is driven by said shaft, in which the drive shaft has a first portion and a hollow portion, which hollow portion forms an axial conduit for admission of a hydraulic liquid;

said plate being mounted on said shaft at the junction between said first portion and said hollow portion, said plate having a recess communicating with said axial liquid supply duct and a port for distribution of the liquid to said pistons, said port being formed on the rear face of said plate, said plurality of pistons being arranged in a circle concentrically with said first portion of said shaft and bearing against said rear face of said plate, and a taper roller bearing mounted on said hollow portion of said shaft and against which the front face of said plate bears.

Dependencies are inferred from the claim text.