Valve drive apparatus for an internal combustion engine having a

Details Valve drive apparatus for an internal combustion engine having a Valve drive apparatus for an internal combustion engine having a

1996-12-02

1998-09-08

Lo, Weilum

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9028, 123 9039, 123 9048, F01L 112, F01L 1300

Patent

active

058030336

ABSTRACT:
A valve drive apparatus having a shim which is prevented from interfering with a cylinder head without decreasing abrasion resistance between the shim and a lifter contacting the shim. A three-dimensional cam includes a cam portion having a slanting cam surface inclined with respect to a rotational axis of the cam. The cam is movable along the rotational axis. The lifter transmits a force generated by a camming action of the cam to the valve. The lifter has a first surface contacting the valve and a second surface substantially opposite to the first surface. A shim is interposed between the cam and the lifter. The shim has a first surface contacting the cam and a second surface opposite to the first surface. The second surface of the shim has a convex spherical shape, and the second surface of the lifter has a concave spherical shape so as to receive the second surface of the shim.

REFERENCES:
patent: 3915129 (1975-10-01), Rust et al.
patent: 4693214 (1987-09-01), Titolo
patent: 4799463 (1989-01-01), Konno
patent: 4850311 (1989-07-01), Sohn
patent: 4909197 (1990-03-01), Perr
patent: 5159906 (1992-11-01), Fontichiaro et al.
patent: 5570665 (1996-11-01), Regueiro

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