Axial piston hydraulic power unit with pseudo slippers

摘要

A combination of a bull nose type and slipper type axial piston pumps. The pseudo slipper axial piston pump has an elongated piston body with a bore disposed therethrough. The bore has a spring within to create a hold down mechanism. Swivelably connected to the piston body is a pseudo slipper that engages an anti-frictional thrust bearing having first and second race elements in parallel relation with a bearing element therebetween. The anti-frictional thrust bearing then controls the angle of the swashplate.