Screw rotor

Details Screw rotor Screw rotor

1989-12-18

1991-10-29

Herrmann, Allan D.

Machine element or mechanism

Gearing

Directly cooperating gears

744247, 74DIG10, 418178, F04C 1816, F16H 108

Patent

active

050605313

ABSTRACT:
One of male and female rotor elements is coated with a coating which is different in hardness from the other uncoated element. Even when the rotor elements come to contact with each other during the operation due to thermal expansion or the like, because of the difference in hardness between the coating and the other uncoated element, either of them which has a less degree of hardness is scraped off. As a result, accident due to contact between the male and female rotor elements can be prevented and the screw rotor can be operated with an optimum clearance between the elements.

REFERENCES:
patent: 3071314 (1959-11-01), Flanagan
patent: 4671751 (1987-06-01), Kasuya et al.
patent: 4695233 (1987-10-01), Miyoshi et al.

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