Rotary expansible chamber devices – Shaft or trunnion lubrication or sealing by diverted working...
Patent
1996-01-16
1997-08-19
Vrablik, John J.
Rotary expansible chamber devices
Shaft or trunnion lubrication or sealing by diverted working...
418181, 418259, 384271, 384399, 477199, F03C 222, F16C 1708, F16C 3310
Patent
active
056581378
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a hydraulic motor and more particularly to a hydraulic motor operating on the rotating vane principle referred to as a rotator.
BACKGROUND OF THE INVENTION
Known rotators are disclosed in Finnish patent applications 843941 and 823499. It is apparent that the seal between the lamellar vanes and the case in a rotator type machine cannot be effected as well as the seal between a piston and cylinder in a cylinder type machine. In a rotator type machine, a small axial tolerance is provided for the axle to account for heat expansion. This tolerance allows the axle to rotate, even when pressure connections to the rotator are closed. However, it is desirable to lock the axle in place when the rotator is not in use.
In a known rotator, a separate brake device is set around the hydraulic motor. This is a relatively complicated arrangement. In addition, the brake device set around the motor can be easily damaged.
SUMMARY OF THE INVENTION
The present invention provides a rotator with conical bearing and brake which locks the rotator in place when the rotator is not in use.
In carrying out the advantages of the invention, the rotator includes an axle and an associated rotor component having lamellar vanes. A case component surrounds the rotator. Chambers are formed between the case and lamellar wings. These chambers are arranged symmetrically in relation to the axle. Pressurized oil feed and outlet openings are connected to the chambers and bearing members in a generally axial direction on both sides of the rotor component. A conical pressure bearing carries the axial rotor load.
The conical pressure bearing comprises a conical arrangement of juxtaposed surfaces defined by the case and axle. The case includes channels leading from the chambers to the small diameter surface of the conical arrangement. The conical arrangement includes gaskets spaced thereamong the juxtaposed surfaces. The conical arrangement is dimensioned to allow oil pressure acting on the conical surfaces to raise the axle off the case. In the absense of oil pressure, the conical surfaces lock against relative rotation through friction.
The rotator also includes a needle bearing between the axle and the case which carries the excess axial force. A spring member mounted between the axle and the case ensures that the conical surfaces press against one another to create a braking effect in the absence of contrary axial force.
In an alternative embodiment, channels leading from the chambers to the small diameter part of the conical arrangement are equipped with counter-valves to permit a free flow in the direction of the conical arrangement. Throttle members in connection with the counter-valves permit a limited flow away from the conical arrangement, so that the conical surfaces meet one another only after a delay after the pressure has been released.
Preferably half of the conical angle of the conical arrangement is between 10.degree. and 20.degree. and most advantageously between 14.degree. and 16.degree.. The axial tolerance of the conical arrangement preferably is in the range of 0.03-0.23 mm. Preferably the materials in the case and the axle that are opposite one another in the conical arrangement are made from heat-treated steel. The surfaces opposite one another of the conical arrangement may be nitrided.
The construction of the rotor is such that the number of lamellar vanes is at least so great that there is always at least one lamellar vane between the outlet side of the chamber and the channel leading to the conical arrangement.
The invention provides that both bearings and Morse friction locking can operate satisfactorily, even though the metals selected as surface materials and the form of the bearing are not optimal.
These and other features and advantages of the invention will be more fully understood from the following detailed description of the invention taken together with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
FIG. 1 is a plan view of a r
REFERENCES:
patent: 2927669 (1960-03-01), Walerowski
patent: 3043412 (1962-07-01), Bartholomaus et al.
patent: 3848716 (1974-11-01), Hanning
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