Method of forming a tappet in an internal combustion engine

Details Method of forming a tappet in an internal combustion engine Method of forming a tappet in an internal combustion engine

1997-08-28

1999-07-06

Cuda, I

Metal working

Method of mechanical manufacture

Prime mover or fluid pump making

2988842, B23P 1500

Patent

active

059183667

ABSTRACT:
An Al alloy tappet used in an internal combustion engine has a spiral groove on the outer circumferential surface of a tappet body. The spiral groove is formed by pushing a cutting tool against the outer circumferential surface and feeding it in an axial direction. Near the lower end of the tappet body, feed rate is decreased, and the cutting tool is moved away from the tappet body to form a smaller spiral groove which increases in diameter downwards. The outer circumferential surface of the tappet body is covered with a coating layer such as Fe, and the lower end which has the smaller spiral groove is chamfered.

REFERENCES:
patent: 2467079 (1949-04-01), Corlett
patent: 3058454 (1962-10-01), Goncalves
patent: 3279446 (1966-10-01), Rappa
patent: 4909198 (1990-03-01), Shiraya et al.
patent: 5228418 (1993-07-01), Doehring
patent: 5280771 (1994-01-01), Groh et al.
patent: 5729900 (1998-03-01), Hara et al.
patent: 5743224 (1998-04-01), Hosaka et al.
patent: 5758415 (1998-06-01), Hara

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