Rotary expansible chamber devices – Working member has planetary or planetating movement – Plural working members or chambers
Patent
1982-01-04
1984-11-27
Vrablik, John J.
Rotary expansible chamber devices
Working member has planetary or planetating movement
Plural working members or chambers
F03C 200
Patent
active
044848706
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to hydraulic positive displacement devices, and more specifically to planetary hydraulic motors.
There is known an internal-gear type hydraulic pump or more (U.S. Pat. No. 3,087,436; published Apr. 30, 1963, Cl. 418-61) comprising an outer stator gear and an inner star gear disposed eccentrically relative thereto, the spaces between the two gears defining volume chambers of varying volume to convert the pressure energy of the incoming fluid into mechanical energy of the rotating shaft. The volume chambers of this motor are confined at the two sides thereof by a cover plate and a wear plate attached to the housing, the latter accommodating a valving mechanism and a tooth-type coupling intended to translate the compound motion of the inner star gear into shaft rotation.
In this known device a control valve of the valving mechanism is driven by universal-joint connections of the toothed coupling, the teeth thereof being subjected to considerable loads which result in their wear and consequently in a phase displacement of the passage of the working fluid into the volume chambers entailing reduced hydromechanical efficiency of the motor. Another disadvantage is that the valving mechanism featuring the universal-joint connections tends to increase longitudinal dimensions of this hydraulic motor. Therefore, a planetary hydraulic motor of the above construction has low efficiency and reliability and requires that components thereof be manufactured to close tolerances.
Also known is a planetary hydraulic motor (cf. USSR Inventor's Certificate No. 181,977; IPC F 05 B; published in the Bulletin "Discoveries, Inventions, Industrial Designs and Trademarks", No. 10, 1966--in Russian) comprising disposed in one plane two pairs of gears--the outer working one, and the inner driving one, and two cover plates arranged at the outer stator gear with a ring rotor having inner teeth cooperating with the shaft teeth and outer teeth engaging with the teeth of the stator gear to define volume chambers.
In this planetary hydraulic motor the function of distributor is performed by the ring rotor having at the end faces thereof axial passages communicating with the spaces between the teeth. The end face of one of the cover plate contacting the ring rotor is likewise provided with axial passages, some of them being adapted to communicate with a working fluid inlet passageway, the others communicating with a working fluid outlet passageway. A disadvantage inherent in the abovedescribed planetary hydraulic motor resides in a rather low delivery rate thereof caused by the small passage area of the passages provided in the ring rotor and one of the cover plates.
There is further known a planetary hydraulic motor (cf. USSR Inventor's Certificate No. 176,186; IPC F 05 B; published in the Bulletin "Discoveries, Inventions, Industrial Designs and Trademarks" No. 21 of Oct. 26, 1965--in Russian) comprising a ring rotor positioned essentrically relative to a shaft, and an outer stator gear enclosed by two cover plates. A valving mechanism of this motor is fashioned as a stationary disk provided with a series of axial passages and a cylindrical sleeve having at the outer surface thereof helical grooves communicated by radial passages in the ring rotor with volume chambers of the ring rotor and alternately communicating with axial passages of the cover plate, the passages being arranged at 180.degree. relative to the corresponding volume chambers.
The helical sleeve is provided with inner teeth adapted to come into meshing engagement with the teeth of the stationary shaft. The ring rotor of the hydraulic motor is subjected to axially acting forces produced by the pressure of the working fluid in the valving mechanism.
Yet another planetary hydraulic motor (cf. French Pat. No. 2,056,110; published May 14, 1971; IPC F 04 C 1/00) comprises positioned in one plane two gear sets: an inner working one and an outer driving one: two cover plates secured on the outer stator gear with an eccentrically arr
REFERENCES:
patent: 3841800 (1974-10-01), Ohrberg et al.
patent: 3910733 (1975-10-01), Grove
patent: 4106883 (1978-08-01), Hansen et al.
patent: 4380420 (1983-04-01), Wusthof et al.
Vrablik John J.
Zaporozhsky Konstruktorskotekhnologichesky Institut Selskokhozya
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