Variable valve actuator apparatus

Details Variable valve actuator apparatus Variable valve actuator apparatus

1998-12-23

2000-05-02

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9017, 123 906, F01L 1300

Patent

active

060559497

ABSTRACT:
A variable valve actuation (VVA) apparatus for an internal combustion engine comprises a drive cam fixed to a drive shaft, a valve operating (VO) cam supported by the drive shaft for pivotal motion, and a motion transmitting mechanism interconnecting the drive cam and the VO cam. The VO cam having a cam surface that extends at least from a cam lift start point to a maximum cam lift point. The cam surface includes a first section providing a ramp section, a second section providing a positive acceleration section, and a third section providing a zero acceleration section that includes a situation where acceleration continuously vary within a predetermined infinitesimal window about zero.

REFERENCES:
patent: 5606942 (1997-03-01), Tsuzuku et al.
patent: 5860399 (1999-01-01), Speil et al.
patent: 5899180 (1999-05-01), Fischer
patent: 5924334 (1999-07-01), Hara et al.
patent: 5937809 (1999-08-01), Pierik et al.
patent: 5988125 (1999-11-01), Hara et al.
patent: 5996540 (1999-12-01), Hara

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