Rotary expansible chamber devices – With frangible drive connection or clutch
Reexamination Certificate
2000-02-15
2001-11-06
Ryznic, John E. (Department: 3745)
Rotary expansible chamber devices
With frangible drive connection or clutch
C417S319000, C192S085060, C092S031000
Reexamination Certificate
active
06312238
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is a method and apparatus for hydraulically disengaging an output shaft of a hydraulic motor. In particular, the hydraulic motor includes a longitudinal movable output shaft which may be moved hydraulically for allowing the driven mechanism to rotate without interference from the hydraulic motor.
In hydraulic equipment, and especially mobile hydraulic equipment, it is often necessary and/or desirable to disengage the hydraulic motor from the mechanism it is driving so as to free wheel the mechanism. An example of this is a hydraulic motor which is connected to the wheels of a mining machine and used to propel the mining machine. When it becomes necessary to tow the mining machine the hydraulic motor must be disengaged from the drive train so the machine will roll freely. Another example is a scissor-lift used to load and unload aircraft. It is typically driven with a hydraulic motor connected to its drive train. When this vehicle requires towing, it is again necessary to disengage the motor from the drive train. Another example is a knuckle-boom loader which is used in the harvesting of timber. When it is in the woods, it is propelled by a hydraulic motor connected to its drive train. When it is transported to another job site, the hydraulic motor must be disconnected to allow the knuckle-boom loader to be towed.
Yet still another example is when a hydraulic motor is used to drive a winch. It is often necessary to disengage the motor in order to free wheel cable off the winch. Disengaging the hydraulic motor in the above examples is often accomplished by unbolting and physically removing the motor, building an elaborate slide which will slide the motor out of engagement, or using an expensive clutch between the motor and the drive train which can disengage the motor. Such disengagement may also be accomplished by hand, as set forth in U.S. Pat. No. 5,261,801. However, the art lacks a means of hydraulically engaging and disengaging a hydraulic motor.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an automated means of engaging and disengaging a hydraulic motor from an external rotary load. Another object of the invention is to provide a means of easily retrofitting prior art hydraulic motors with automated means of engaging and disengaging the motor. Another object of the present invention is to provide a non-torque bearing hydraulic actuator.
There is provided a retractable shaft motor assembly comprising an axially moveable drive shaft, a retractable rod in communication with the drive shaft, an actuator in communication with the retractable rod, and a motor positioned between the drive shaft and the actuator. The actuator rod may be fixedly connected to the drive shaft. The actuator rod may be rotatably connected to the actuator. The actuator rod may be slidably positioned along an axis of the motor. The retractable actuator rod may be non-torque-bearing. The motor may be a hydraulic motor.
There is also provided a hydraulically retractable shaft motor comprising a motor, the motor having a longitudinal axis, an axially moveable output shaft, the output shaft having an interface for selectively engaging the motor, and an axial hydraulic actuator assembly connected to the output shaft. The hydraulic actuator assembly may comprise a cylinder, a piston, and an actuator rod. The motor may be a hydraulic motor comprising a rotor and a stator, and the hydraulic actuator assembly may comprise a non-torque bearing actuator rod. The actuator rod may be non-torque bearing. The actuator rod may be rotatably connected to the piston. The motor and the output shaft may have longitudinal coacting splines.
There is also provided a method of disengaging a hydraulic motor having a rotor, a stator, and a longitudinally moveable output shaft in selective communication with an external rotary load, comprising hydraulically and longitudinally moving, the output shaft relative to the rotor whereby the output shaft disengages from the external load.
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Rineer Hydraulics, Inc.
Ryznic John E.
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