Rotary expansible chamber devices – Working member has planetary or planetating movement – Plural working members or chambers
Reexamination Certificate
1998-04-20
2001-02-27
Vrablik, John J. (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Plural working members or chambers
Reexamination Certificate
active
06193490
ABSTRACT:
BACKGROUND OF THE INVENTION
Hydraulic pressure devices are efficient at producing high torque from relatively compact units. Their ability to provide low speed and high torque make them adaptable for numerous applications. U.S. Pat. Nos. 4,285,643, 4,357,133, 4,697,997 and 5,173,043 are examples of hydraulic motors.
In these devices the input/output mechanism, typically a drive shaft with bearings and a wobblestick, develop heat and residue such as sludge (from heat) and metal powder (from wear). A number of these devices therefor incorporate lubrication circulation paths to pass fluid continually over such input/output mechanism. Examples include U.S. Pat. No. 4,533,302 (parasitically drains fluid outward off of each pressurized volume chamber), U.S. Pat. No. 4,390,329 (use naturally occurring leakage), U.S. Pat. Nos. 3,749,195 and 4,480,972 (uses inactive seals), U.S. Pat. Nos. 3,572,983 and 4,362,479 (uses ball check valves) and U.S. Pat. No. 4,285,643 (uses one of the two main fluid ports).
These prior art units, however, either require extensive machining or contaminate the hydraulic fluid prior to usage in the pressure mechanism.
The present invention eliminates these problems.
OBJECTS AND SUMMARY OF THE INVENTION
It is the object of the present invention to provide for a high speed high flow hydraulic motor having a rotational speed valve;
It is another object of the present invention to provide for lubrication of the rotary drive parts of a hydraulic motor;
It is another object of the present invention to eliminate the need for a separate case drain for the hydraulic motor by incorporating same into the main valve;
It is an object of this invention to reduce the complexity of gerotor motor housings;
It is another object of the present invention to increase the efficiency of rotating valved hydraulic motors;
It is still another object of the present invention to reduce the cost of and manufacturing time for hydraulic motors;
It is yet another object of the present invention to increase the adaptability of hydraulic motors;
Other objects and a more complete understanding of the invention may be had by referring to the drawings in which:
REFERENCES:
patent: 3532447 (1970-10-01), Charlson
patent: 3887308 (1975-06-01), Liebert
patent: 4171938 (1979-10-01), Pahl
patent: 4362479 (1982-12-01), Pahl
patent: 4390329 (1983-06-01), Thorson
patent: 4480972 (1984-11-01), Zumbusch
patent: 4881880 (1989-11-01), Dlugokecki
patent: 4936402 (1990-06-01), White, Jr.
patent: 5137438 (1992-08-01), Miller
patent: 56-156487 (1981-12-01), None
Lightbody & Lucas
Vrablik John J.
White Hydraulics Inc.
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