Rotary expansible chamber devices – Working member has planetary or planetating movement – Plural working members or chambers
Patent
1982-05-13
1984-07-31
Vrablik, John J.
Rotary expansible chamber devices
Working member has planetary or planetating movement
Plural working members or chambers
418104, 418131, F03C 208
Patent
active
044627734
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to hydraulic positive displacement machines, and more particularly to planetary hydraulic motors.
2. Prior Art
There are known planetary hydraulic motors comprising gear pairs of inner engagement and sealing assemblies of a rotating shaft. However, the above sealing assemblies fail to ensure reliable and durable operation of the hydraulic motors at high pressures in their interiors (cf. B. N. Birjukov "Rotary Hydraulic Machines" in Russian, published in 1972 by the Mashinostroenie Publishers, Moscow, see p. 28, FIG. 19; USSR Inventor's Certificate No. 449178, IPC F04C 1/00, published in Bulletin "Discoveries, Inventions, Industrial Designs and Trade Marks" No. 41, 1974--in Russian; and USSR Inventor's Certificate No. 595536, IPC F04C 1/00, published in Bulletin "Discoveries, Inventions, Industrial Designs and Trademarks" No. 8, 1978--in Russian).
A planetary hydraulic motor which is closest in its technical essence to the one claimed in this invention is exemplified in USSR Inventor's Certificate No. 696179, IPC F04C 1/00, published in Bulletin "Discoveries, Inventions, Industrial Designs and Trademarks" No. 41, 1979--in Russian. This planetary hydraulic motor comprises a housing with a stator gear, one side of the stator gear being covered by a cup intended for mounting the motor, the other side thereof being covered by a cup for feeding the motor with a working fluid. The housing incorporates a shaft having fixedly secured thereon a gear, a sealing assembly of the shaft in the form of a thrust ring disposed in the cup for mounting the motor, and a sleeve member having a cylindrical projection adjoining by the end face surface thereof the working surface of the thrust ring, the thrust ring being fabricated from fluoroplastic.
The above planetary hydraulic motor also comprises a ring rotor disposed eccentrically relative to the shaft to meshingly engage with the shaft gear and the stator gear, the stator gear and the outer toothing of the ring rotor forming a transmission gear pair, while the shaft gear and the inner toothing of the ring rotor define a gear pair having working chambers to feed the working fluid thereinto and discharge it therefrom, the working fluid being delivered from a valving mechanism including a fluid distributor fixedly secured on the shaft, and a valve disposed in the cup for feeding the working fluid.
Inherent in the known planetary hydraulic motors operating under high internal pressures and susceptible to radial beats of the shaft is a disadvantage residing in that the thrust ring wears out prematurely. This is accounted for by the fact that part of the fluoroplastic ring projected into a radial gap tends to be crumpled and damaged due to the beatings of the shaft resulting in a failure of the thrust ring. Therefore, the aforedescribed sealing assembly fails to provide reliable and durable operation of the planetary hydraulic motor.
SUMMARY OF THE INVENTION
The present invention is directed toward the provision of a planetary hydraulic motor featuring a shaft sealing assembly of greater reliability, durability and simplicity when the planetary motor operates at high working pressures in its interior by virtue of the employment of an elastic element and the arrangement thereof on a sealing sleeve.
This is attained by a planetary hydraulic motor which comprises a housing with a stator gear one side of which is covered by a cup intended for fixing the planetary hydraulic motor in working position, the other side thereof being covered by a cup for feeding a working fluid, a shaft arranged inside the housing and having a gear rigidly secured thereon, a sealing element of the shaft in the form of a thrust ring secured in the cup for fixing the planetary hydraulic motor in working position, a sleeve element having a cylindrical projection adjoining by an end face thereof the working surface of the thrust ring, the sleeve element being mounted on the shaft, a ring rotor disposed eccentrically relative to th
REFERENCES:
patent: 2956512 (1960-10-01), Brundage
Erasov Fedor N.
Levitsky Viktor K.
Skripkin Sergei V.
McGlew, Jr. John J.
Vrablik John J.
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