Direct drive variable displacement hydraulic apparatus

Details Direct drive variable displacement hydraulic apparatus Direct drive variable displacement hydraulic apparatus

1989-08-30

1991-07-30

Chambers, A. Michael

Motors: expansible chamber type

Three or more cylinders arranged in parallel radial or...

Motive fluid bypass to or from assembly

91482, 417222R, 417270, F04B 1304

Patent

active

050351702

ABSTRACT:
In order to eliminate leakage and provide a more efficient system, a variable displacement hydraulic apparatus (10) includes a cylinder block (12) having a plurality of hydraulic cylinders (14) therein. Each of the cylinders (14) has a hydraulic piston (16) disposed therein for reciprocating movement relative thereto. The cylinders (14) and pistons (16) are disposed about an axis (18) of the hydraulic apparatus (10). The hydraulic apparatus (10) also includes a shaft (20) operatively associated with the pistons (16) for relative driven movement therebetween and a valve block (22) having a hydraulic fluid inlet port (24) for supplying hydraulic fluid to the cylinders (14) together with a hydraulic fluid outlet port (26) for returning hydraulic fluid from the cylinders (14). The inlet and outlet ports (24 and 26) communicate with the cylinders (14) through a port plate (28) having at least one port slot (30) therethrough. The port plate (30) is variably angularly positionable relative to the inlet and outlet ports (24 and 26) for varying displacement of the hydraulic apparatus (10). For this purpose, an electrically driven displacement device (32) is directly coupled to the port plate (30) to rotate it upon demand.

REFERENCES:
patent: 2979037 (1961-04-01), Budzich
patent: 3050014 (1962-08-01), Sullivan
patent: 3117529 (1964-01-01), Firth et al.
patent: 4875403 (1989-10-01), Stroze et al.

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