Roller type mechanical tappet

Details Roller type mechanical tappet Roller type mechanical tappet

1999-01-14

1999-09-07

Kamen, Noah P.

Internal-combustion engines

Poppet valve operating mechanism

Tappet

2988843, F01L 116

Patent

active

059470690

ABSTRACT:
A tappet comprises a foot having a convex cam contact surface and an axially extending hub, a tappet body having a lower body portion with a lower axial bore formed therein to receive the axially extended hub of the foot, and a bearing assembly positioned between the foot and the lower portion of the tappet body. The cam contact surface operates in a frictional relationship with a cam lobe of a rotating cam. The frictional relationship between the cam lobe and the cam contact surface of the foot induces the foot to rotate about the center line of the tappet. The bearing assembly operates to reduce friction as the foot independently rotates axially about a center line of the tappet body.

REFERENCES:
patent: 1473711 (1923-11-01), Sherbondy
patent: 1840633 (1932-01-01), Morehouse
patent: 1930261 (1933-10-01), Berry
patent: 3303833 (1967-02-01), Melling
patent: 3450228 (1969-06-01), Worthman et al.
patent: 5188067 (1993-02-01), Fontichiaro
"Automotive Mechanics" (10th Ed.) by William H. Crouse and Donald L. Anglin, McGraw-Hill (1993), Chapter 12, pp. 125-137, and Chapter 14, pp. 159-173.
"Power Secrets" by Smokey Yunick and Larry Schreib, S-A Design Books (1989), Chapter 5, pp. 68-94.

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