Swash plate type axial piston pump

A swash plate type axial piston pump, comprising:

• a housing;
• a rotatable shaft disposed within said housing and supported rotatably within said housing by means of bearings at both ends thereof, respectively, and which can be driven rotationally by a driving source;
• a swash plate fixedly secured to said housing in a state inclined relatively to the center axis of said rotatable shaft by means of an annular supporting member;
• a cylinder block disposed within said housing and mounted on said rotatable shaft slideably in an axial direction thereof and co-rotatably therewith, said cylinder block having a plurality of cylinders each defining therein a pump chamber;
• a plurality of pistons having one end portions slideably fit in said cylinders, respectively;
• a plurality of shoes having one end coupled swingably to said pistons, respectively, and other ends placed in slideable contact with one lateral surface of said swash plate;
• an annular shoe holder having a plurality of retaining holes and an outer peripheral portion slideably contacting said supporting member;
• and
• a valve plate disposed such that one lateral surface thereof bears on the inner surface of said housing with other lateral surface thereof bearing on a bottom surface of said cylinder block, said rotatable shaft extending through said valve plate, wherein an intake passage and an exhaust passage formed in said housing are selectively communicated to the pump chambers defined by said cylinders, respectively,
• wherein at least one of plural sliding members contacting slideably with one another is coated with a nickel-phosphor-Teflon layer.

A swash plate type axial piston pump, comprising:

• a housing;
• a rotatable shaft disposed within said housing and supported rotatably within said housing by means of bearings at both ends thereof, respectively, and which can be driven rotationally by a driving source;
• a swash plate fixedly secured to said housing in a state inclined relatively to the center axis of said rotatable shaft by means of an annular supporting member;
• a cylinder block disposed within said housing and mounted on said rotatable shaft slideably in an axial direction thereof and co-rotatably therewith, said cylinder block having a plurality of cylinders each defining therein a pump chamber;
• a plurality of pistons having one end portions slideably fit in said cylinders, respectively;
• a plurality of shoes having one end coupled swingably to said pistons, respectively, and other ends placed in slideable contact with one lateral surface of said swash plate;
• an annular shoe holder having a plurality of retaining holes and an outer peripheral portion slideably contacting said supporting member;
• and
• a valve plate disposed such that one lateral surface thereof bears on the inner surface of said housing with other lateral surface thereof bearing on a bottom surface of said cylinder block, said rotatable shaft extending through said valve plate, wherein an intake passage and an exhaust passage formed in said housing are selectively communicated to the pump chambers defined by said cylinders, respectively,
• wherein at least one pair of mutually sliding members of plural pairs of mutually sliding members are each coated with a nickel-phosphor-Teflon layer by plating.