Hydraulic pump or motor

Details Hydraulic pump or motor Hydraulic pump or motor

1998-08-04

2000-07-25

Ryznic, John E.

Expansible chamber devices

Abutment connection between working member and power...

92 71, F16J 110

Patent

active

060924578

ABSTRACT:
A hydraulic pump or motor comprises a rotating disk member (31) supported free to rotate in a housing (11), and a cylinder block (14) supported free to rotate in the space of the housing (11) around a rotation axis inclined to the rotation axis of the rotating disk member (31). The rotating disk member (31) and cylinder block (14) are connected by a joint (17), and they are rotated in the same way by a drive shaft (12). A hemispherical shoe (29) in contact with the rotating disk member (31) via a spherical surface and having a smooth surface (29A) on the other side, comes in contact with a pad (27) of synthetic resin attached to the tip of a piston (20). The pad (27) has a smooth support surface (27A) perpendicular to the piston axis, and comes in contact with the smooth surface (29A) of the shoe (29) on this support surface (27A). A pocket (27D) for leading a cylinder internal pressure through the piston is formed on the contact surface between the pad (27) and shoe (29) forming a hydrostatic bearing. Each of the pistons (20) is pushed in the extending direction by a spring (21). A cylindrical piston cap (23) formed of a low friction synthetic resin on the outer circumference of the piston (20) slides in a cylinder bore (18).

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