Hydraulic motor with pressure compensating manifold

Details Hydraulic motor with pressure compensating manifold Hydraulic motor with pressure compensating manifold

2000-06-05

2001-07-10

Vrablik, John J. (Department: 3748)

Rotary expansible chamber devices

Working member has planetary or planetating movement

Plural working members or chambers

C418S077000, C418S187000

Reexamination Certificate

active

06257853

ABSTRACT:

BACKGROUND OF THE INVENTION
Hydraulic pressure devices are both mechanically and volumetrically efficient at producing high torque from relatively compact devices. Their ability to provide low speed and high torque make them adaptable to numerous applications. However, their cost and complexity make them relatively expensive, thus unsuitable from a business standpoint for certain applications. The present invention of a hydraulic motor pressure compensating manifold alleviates a number of these business concerns.
DESCRIPTION OF THE PRIOR ARTS
Hydraulic motors are well known in the art. Examples include the rotating valve devices manufactured by Eaton Corporation, the orbiting valve devices manufactured by Parker-Hannifin, and other devices including those made by the assignee of the present application, White Hydraulics. The motors themselves typically have complicated housing parts necessitating numerous machining, drilling and other secondary operations in order to manufacture the unit. Each of these additional manufacturing steps adds the complexity of the hydraulic motor, increasing the cost of manufacture, maintenance and others attendant to the motors.
In instant respect to the present invention, a hydraulic motor pressure compensating manifold, previous attempts directed at balancing a motor include White U.S. Pat. No. 4,717,320 issued Jan. 5, 1998, White U.S. Pat. No. 4,474,544 issued Oct. 2, 1984 and Eaton U.S. Pat. No. 4,976,594 issued Dec. 10, 1990. Each of these motors is, however, sufficiently expensive that they are not suitable for relatively low cost low force applications like wheel drives for lawn maintenance mowers and other applications which include factors driven by the cost of the hydraulic motor.
The present invention is designed to simplify the construction of hydraulic motors and more particularly hydraulic motors having a pressure compensating mechanism.
OBJECTS AND SUMMARY OF THE INVENTION
It is an object of the present invention to simplify the construction of hydraulic motors.
It is another object of the present invention to increase the volumetric and mechanical efficiency of hydraulic motors.
It is another object of the present invention to lower the cost of hydraulic motors.
It is yet another object of the present invention to increase the adaptability of hydraulic motors.
Other objects of the invention and a more complete understanding of the invention may be had referring to the drawings in which:


REFERENCES:
patent: 3532447 (1970-10-01), Charlson
patent: 4474544 (1984-10-01), White, Jr.
patent: 4717320 (1988-01-01), White, Jr.
patent: 4741681 (1988-05-01), Bernstrom
patent: 4976594 (1990-12-01), Bernstrom
Eaton Promotional Material, dated prior to applicant's invention.

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