Gear pump or motor with hard layer in interior casing surface

Details Gear pump or motor with hard layer in interior casing surface Gear pump or motor with hard layer in interior casing surface

1987-06-23

1988-05-17

Vrablik, John J.

Rotary expansible chamber devices

With mechanical sealing

Seal on cylinder engaging rotary member separates inlet and...

418170, 418178, 418179, 418206, F04C 218, F04C 210, F04C 1500

Patent

active

047447389

ABSTRACT:
A gear pump or motor comprises a pair of gears intermeshing with each other, a case body accommodating the pair of gears, and a hard layer formed on an inner surface of the case body. The hard layer is made of a material to be as hard as not to be cut by tooth tips of the pair of gears. The hard layer may be a ceramic coating or a composite coating layer which performs a grinding like operation on the tooth tips.

REFERENCES:
patent: 2126200 (1938-08-01), Linderman
patent: 2519588 (1950-08-01), McCulloch
patent: 3268949 (1966-08-01), Schmidt et al.
patent: 3483825 (1969-12-01), Difford et al.
patent: 3554677 (1971-01-01), Zapf et al.
patent: 3712767 (1973-01-01), Beutter
patent: 4137023 (1979-01-01), Moked et al.
patent: 4253808 (1981-03-01), White

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