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A hydraulic displacement unit of the axial piston fixed displacement type having a rotatable cylinder block with axially reciprocal pistons, each of which has a slipper associated with a swash surface, as defined by a thrust plate, and structure for obtaining fixed maximum clearance between the slip

A hydraulic displacement unit of the axial piston fixed displacement type having a rotatable cylinder block with axially reciprocal pistons, each of which has a slipper associated with a swash surface, as defined by a thrust plate, and structure for obtaining fixed maximum clearance between the slippers and the thrust plate. This fixed maximum clearance is achieved by the use of the controlled positioning of a slipper retainer bearing relative to the surface of the thrust plate by use of a tubular member positioned within the cavity of the unit housing which is securely located and positioned by assembly of an end cap to the housing to be located between the thrust plate and the end cap. The tubular member has a series of windows at the thrust plate end thereof for receiving outwardly-extending peripheral tabs on the slipper retainer bearing to control the distance of the slipper retainer bearing from the thrust plate and with the thickness of the slipper retainer bearing, a slipper retainer, and slipper feet determining the fixed maximum clearance. The tubular member is constructed with permanently deformable fingers to take up manufacturing tolerances between components upon assembly of the unit and has provision for optional mounting of different types of spring structures acting on the slippers for urging the slippers toward the thrust plate and resisting tipping thereof.

대표청구항 ▼

A hydraulic displacement unit of the fixed displacement type having a housing with a cavity, a rotatable cylinder block in said housing cavity and carrying a plurality of pistons axially reciprocable in chambers in said cylinder block as the cylinder block rotates, an inclined swash surface at one e

A hydraulic displacement unit of the fixed displacement type having a housing with a cavity, a rotatable cylinder block in said housing cavity and carrying a plurality of pistons axially reciprocable in chambers in said cylinder block as the cylinder block rotates, an inclined swash surface at one end of said cavity, an end cap for closing said cavity, means for securing said end cap to said housing, a slipper associated with each of said pistons and each having a slipper foot engageable with said inclined swash surface for controlling the axial stroke of said pistons, an annular slipper retainer bearing, an annular slipper retainer associated with said slippers and captured between said annular slipper retainer bearing and the slipper feet, a tubular member compressively captured between said swash surface and said end cap, with an end of the tubular member engaging said swash surface, and interengaging means on said tubular member at a distance from said end thereof and on said retainer bearing to provide a fixed maximum clearance between the slippers and the swash surface.