Selected bearing couple for a rock bit journal and method for ma

Details Selected bearing couple for a rock bit journal and method for ma Selected bearing couple for a rock bit journal and method for ma

1988-07-05

1989-04-11

Parker, Roscoe V.

Metal tools and implements, making

Blank or process

Drill

384 92, B21K 502

Patent

active

048195170

ABSTRACT:
A method of providing a selected bearing couple in a journal bearing of a rotary rock bit is described, wherein differential thermal expansion is used to mate a thin walled bushing of a chosen bearing alloy to one of the steel structural members. A pre-finished and pre-heat treated thin walled bushing is formed of the desired bearing alloy. Very little valuable space is required by the thin walled bushing. The use of arc-deposited metal, press fitting, or of loose parts is avoided, and many potential bearing alloys are adaptable as candidates for use in such a bushing.

REFERENCES:
patent: 3721307 (1973-03-01), Mayo
patent: 3917361 (1975-11-01), Murdoch
patent: 3990751 (1976-11-01), Murdoch
patent: 3995917 (1976-12-01), Quinlan
patent: 4744270 (1988-05-01), Veziyian

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