Rotary expansible chamber devices – With wear surface treatment or integrally plated wear layer
Patent
1989-01-26
1990-07-03
Vrablik, John J.
Rotary expansible chamber devices
With wear surface treatment or integrally plated wear layer
418225, 418257, F04C 2344
Patent
active
049386719
ABSTRACT:
A rotary pump having an eccentric rotor disposed in a cylindrical housing is provided with a pair of cylindrical roller pistons disposed in opposed recesses in the rotor for rolling engagement with the internal surface of the housing. A pair of bearing rings having radially inwardly projecting ribs are located at opposite ends of the housing with the ribs disposed in engagement with complimentary grooves formed in the external surface of the rotor and in the external surfaces of each roller to positively locate the rollers within the recesses. A plurality of bearing support members are provided having semi-circular cradle portions engaging the grooves in the rollers and parallel leg portions extending through parallel bores in the housing. Interconnecting rods are provided between the legs of opposed bearing support members to maintain the rollers in positive engagement with the internal surface of the housing at all times.
REFERENCES:
patent: 1965872 (1934-07-01), Webb et al.
patent: 2117573 (1938-05-01), Rawls
patent: 2684037 (1954-07-01), Scognamillo
patent: 4284392 (1981-08-01), Pareja
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