Slide faces of piston shoes in radial piston machines

Details Slide faces of piston shoes in radial piston machines Slide faces of piston shoes in radial piston machines

1977-08-05

1980-07-15

Hershkovitz, Abraham

Expansible chamber devices

Rotating cylinder

Plural cylinders

91488, 92 72, 92148, 92159, F01B 1306

Patent

active

042122309

ABSTRACT:
Piston shoes in radial piston devices of the prior art were provided with balancing fluid pressure pockets of circular configuration or of elongation normal to the movement direction of the piston shoes. Piston shoes had to provide the space for said pockets and thereby extended over the diameter of the piston. That resulted in deformation of the piston shoe and in friction in areas that cannot be lubricated between the piston shoe outer face and the piston actuator guide face. The invention provides a pair of balancing pockets normal to that of the prior art and extended in the movement direction of the piston shoes. Piston shoes are therefore short in the direction of the pivot axis, deformations are prevented and the areas that cannot be lubricated are reduced to a minimum or removed. The piston shoe becomes thereby able to operate under higher pressures, increased relative speeds and with better efficiency at assured perfect lubrication between neighboring faces.

REFERENCES:
patent: 3223046 (1965-12-01), Eickmann
patent: 3255706 (1966-06-01), Eickmann
patent: 3277834 (1966-10-01), Eickmann
patent: 3304883 (1967-02-01), Eickmann
patent: 3628425 (1971-12-01), Morita
patent: 3650180 (1972-03-01), Gantschnigg
patent: 3828657 (1974-08-01), Neuman
patent: 3945303 (1976-03-01), Steiger
patent: 3948149 (1976-04-01), Fricke

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