Metal working – Method of mechanical manufacture – Prime mover or fluid pump making
Patent
1997-07-31
1999-09-07
Cuda, I.
Metal working
Method of mechanical manufacture
Prime mover or fluid pump making
29888, B23P 1500
Patent
active
059468009
ABSTRACT:
A method for producing dimensionally accurate rocker arms formed with a roller-receiving portion at one end. The method of the invention produces rocker arms which have a roller-receiving, fork-like portion at one end of the rocker arm body for receiving a roller contacting a cam. The method uses the steps of inserting between the opposed inner surfaces of the roller-receiving portion an insert jig having a parallel surface and a slant surface inclined inwardly of the jig by a predetermined angle from the parallel surface; placing a pressing jig on an outer surface of the roller-receiving portion, the surface of the pressing jig to be contacted with the outer surface of the roller-receiving portion having a parallel surface and a slant surface inclined outwardly of the pressing jig by a predetermined angle from the parallel surface; and applying pressure to the pressing jig to thereby press the inner surfaces of the roller-receiving portion against the surfaces of the insert jig. The predetermined angles of the insert jig and the pressing jib are respectively in the range of from about 2.degree. to about 4.degree..
REFERENCES:
patent: 4825717 (1989-05-01), Mills
patent: 4829647 (1989-05-01), Anderson et al.
patent: 5678305 (1997-10-01), Nagano et al.
patent: 5774984 (1998-07-01), Kotani
Cuda I.
Nippon Piston Ring Co. Ltd.
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