Hydraulic equipment

Details Hydraulic equipment Hydraulic equipment

2007-12-11

2007-12-11

Lopez, F. Daniel (Department: 3745)

Power plants

Pressure fluid source and motor

Input pump and rotary output motor system having...

Reexamination Certificate

active

11369978

ABSTRACT:
The present invention relates to hydraulic equipment comprising input shaft (2) and output shaft; first and second plungers (8, 10) and first and second spool valves (9, 11) which are moved reciprocally axially; a cylinder block (7) which houses the plungers and spool valves and is rotated integrally with the input shaft; an input side swash plate (6) which touches the first plungers; and an output side swash plate (12) which touches the second plungers and is rotated integrally with the output shaft. The purpose of the present invention is to reduce number of parts concerning to the accuracy of the reciprocal movement of the first and second spool valves.Spool valve guides (37and47) on which guide grooves (37band47b) slanted against axis of the rotary shaft are formed, and the first or second spool valve is engaged with a holding member (38or48) attached to the guide groove or the guide groove.

REFERENCES:
patent: 1780365 (1930-11-01), Sherman
patent: 6122914 (2000-09-01), Hayashi et al.
patent: 19527649 (1997-01-01), None
patent: 11-82671 (1999-03-01), None
patent: 2002-31209 (2002-01-01), None
patent: 2003-14079 (2003-01-01), None
Seizaburo Ashiba, “Kikai Undo Kiko,” Kabushiki Kaisha Gihodo, Oct. 15, 1957, pp. 33, 175 (particularly, paragraph Nos. 152, 963).
Jones, Franklin D., Ingenious Mechanisms for Designers and Inventors Volume II, New York: The Industrial Press, 1951, 9thprinting, pp. 51 to 53, Fig. 31 (particularly, Operating Two Slides in Opposite Directions with One Single-Groove Cam).

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