Variable valve apparatus of internal combustion engine

Details Variable valve apparatus of internal combustion engine Variable valve apparatus of internal combustion engine

2007-11-06

2007-11-06

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090390, C123S090440

Reexamination Certificate

active

11375098

ABSTRACT:
A variable valve apparatus of an internal combustion engine includes a cam shaft, a drive cam formed integrally with the cam shaft, and a rocker arm mechanism for transmitting an opening/closing force from an operating end portion thereof to an intake or an exhaust valve by receiving the opening/closing force by a drive cam opposed roller brought into contact with the drive cam. For displacing a lift time period, in which the drive cam opposed roller receives the opening/closing force, frontward/rearward in a direction of rotating the drive cam, an up section of a cam lift face of the drive cam is formed to be longer than a down section thereof such that a change region of a lift valve closing time point of the lift time period becomes larger than a change region of a lift valve opening time point thereof.

REFERENCES:
patent: 7168404 (2007-01-01), Murata
patent: 2003-239712 (2003-08-01), None

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