Rotary expansible chamber devices – Working member has planetary or planetating movement – Plural working members or chambers
Patent
1979-04-12
1981-08-25
Smith, Leonard E.
Rotary expansible chamber devices
Working member has planetary or planetating movement
Plural working members or chambers
13762524, F04C 210, F04C 1502
Patent
active
042856434
ABSTRACT:
A rotary fluid pressure device is described as comprising a housing having fluid inlet and outlet openings and in the housing is a gerotor device having an external stator having internal teeth and a rotor within the stator having external teeth, one less in number than those on the stator. The rotor is eccentrically mounted with respect to the stator so that upon rotation of the rotor, the sealing engagement between the external and internal teeth forms expanding cells on one side of the line of eccentricity and forms contracting cells on the other side of the line. A drive shaft concentric with the rotor has a hollow end within the housing and a solid drive end outside of the housing. A wobble stick drivingly connects the rotor and the shaft and the wobble stick has a pivot point at its inner end connected by a rigid pivot pin with a central recess in the housing axially of the shaft which eliminates axial movement between the drive shaft and the rotor which would otherwise be caused by an uneven end formed by wear on the wobble stick. A manifold, fixed in the housing, provides a double balance pad diametrically opposite each of an inlet passage for conducting inlet fluid to each of the cells between the stator and rotor. Twelve shallow slots are hobbed over six angled holes conducting fluid to the expanding and contracting cells and over six radial holes leading to the balance pads, giving the required accuracy. A novel seal and thrust bearing structure, where the drive shaft exits from the housing, results in good concentricity of the seal carrier and a thrust bearing between the seal carrier and the adjacent end of the housing provides with a flow pumped by the bearing during rotation of the device, which results in a lower temperature on the seal and bearing.
REFERENCES:
patent: 3087436 (1963-04-01), Dettlof et al.
patent: 3473438 (1969-10-01), Hansen
patent: 3516437 (1970-06-01), Folkerts
patent: 3572983 (1971-03-01), McDermott
patent: 3863449 (1975-02-01), White, Jr.
patent: 4087215 (1978-05-01), Miller
patent: 4106883 (1978-08-01), Hansen et al.
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