Method of forming a tappet body in an internal combustion engine

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

1993-09-28

1995-01-10

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Forcing work into or within closed die; e.g., forging

2988843, B21K 120

Patent

active

053796268

ABSTRACT:
To manufacture an Al alloy tappet in an internal combustion engine, an intermediate which has a circular upper wall and a cylindrical skirt is formed in the first forging step. In the second forging step, a recess is formed on the lower surface of the upper wall. Relatively large-sized metallic structure in the first forging step is finally collapsed, thereby increasing strength and rigidity of the upper wall around the recess.

REFERENCES:
patent: 1082200 (1913-12-01), Knaebel
patent: 4291568 (1981-09-01), Stifano, Jr.
patent: 4847968 (1989-07-01), Shirai et al.
Society of Automotive Engineers "Aluminum Valve Lifter for Toyota New V-8 Engine", Paper No. 900450, approximately 2/26 or 3/2, 1990.

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