Variable engine valve driver

Details Variable engine valve driver Variable engine valve driver

1997-10-21

1999-02-16

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 905, F01L 134, F02D 1302

Patent

active

058709843

ABSTRACT:
A valve drive device has a pair of valves in association with a cylinder and a pair of cams provided on the camshaft to selectively open and close the valves. Each cam has a cam surface and a cam nose. The cam surface has an axially varying radius at the cam nose. A bearing supports the camshaft between the pair of cams. A pair of valve lifters are arranged respectively between the cams and the valves. Each valve lifter has a supporting surface and a cam follower supported on the supporting surface to slidably contact with the cam surface. A moving mechanism moves axially to change the lift amount of the valves, Each cam follower is located farther from the bearing, which is positioned between the pair of cams, than the center of the supporting surface in the axial direction of the camshaft. This results in greater axial movement of the cams and a greater variation of valve lift without placing excessive axial lodes on the camshaft.

REFERENCES:
patent: 4794893 (1989-01-01), Masuda et al.
patent: 4850311 (1989-07-01), Sohn
patent: 5148779 (1992-09-01), Okuse et al.
patent: 5329895 (1994-07-01), Nishida et al.
patent: 5367991 (1994-11-01), Asai et al.
patent: 5381764 (1995-01-01), Fukuma et al.

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