Patent ID: 7172394

Claim:
In a variable displacement axial piston pump having a swashblock with a pair of axially spaced apart convex surfaces and a saddle with a mating pair of axially spaced apart concave surfaces to receive the swashblock convex surfaces with bearing material between said mating concave and convex surfaces, the improvement wherein the bearing material between one pair of mating concave and convex surfaces is integral with the bearing material between the other pair of mating concave and convex surfaces, a central section of the same material as said bearing material joins and is integral with the bearing material which is in between said two pairs of mating concave and convex surfaces, at least one of the inner and outer surfaces of the central section is radially offset from the adjacent surfaces of the bearing material which is between said two pairs of mating concave and convex surfaces, said offset surface is on the outer side of said bearing material and fits within a recess of said saddle and at least one ledge is defined between said offset surface and an adjacent surface of said bearing material, said ledge mating with a surface of said saddle to resist skewing of said bearing material relative to an axis of said concave surfaces of said saddle.