Valve lifter structure

Details Valve lifter structure Valve lifter structure

1997-12-30

1999-11-23

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 905, F01L 1300

Patent

active

059881275

ABSTRACT:
A valve lifter structure having a follower which tilts in a guide groove, for a mechanism for varying valve characteristics of a poppet valve by axial displacement of a three-dimensional cam having a profile varying in the axial direction, which is easily machined without degrading a mechanical strength. A guide groove is formed on a top surface of a valve lifter interposed between a cam and a top of a valve stem of a poppet valve to extend perpendicular to the axis of the cam. A follower is located in the guide groove, which extends in parallel to the guide groove and is capable of tilting in accordance with the change of the cam profile while being brought into slide-contact with the guide groove, and is inhibited from displacing in the extending direction by a limiting means. The guide groove is formed to have opposite open ends. The limiting means is defined by a stopper located on the guide groove side and an abutment member located on the follower side to abut to the stopper. The abutment member is defined by a pair of walls of the follower spaced at a distance opposite to each other in the extending direction thereof.

REFERENCES:
patent: 5159906 (1992-11-01), Fontichiaro et al.

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