Valve operating device for internal combustion engine

Details Valve operating device for internal combustion engine Valve operating device for internal combustion engine

1994-12-27

1996-09-10

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9044, F01L 1300

Patent

active

055535844

ABSTRACT:
An engine valve operating device includes rocker arms, cams on a cam shaft corresponding to the rocker arms, and a connection switchover device for switching over between the connection and disconnection of the rocker arms. The switchover device includes a piston slidably fitted into the first rocker arm operatively connected to an engine valve with one end facing a hydraulic pressure chamber, a pin slidably fitted into the second rocker arm adjacent the first rocker arm with one end abutting against the other end of the piston, a limiting mechanism slidably fitted into the third rocker arm operatively connected to another engine valve and adjoining the second rocker arm on the opposite side from the first rocker arm and which limiting mechanism abuts against the other end of the pin, and a spring biasing mechanism in the third rocker arm for biasing the limiting mechanism toward the pressure chamber. The pin and the limiting mechanism are displaced at two stages by the spring mechanism in response to a two-stage increase in the hydraulic pressure in the pressure chamber. The pin has an axial length such that with one axial end fitted into the first rocker arm, the other end is located between the second and third rocker arms.

REFERENCES:
patent: 4612884 (1986-09-01), Ajiki et al.
patent: 4727831 (1988-03-01), Nagahiro et al.
patent: 4887563 (1989-12-01), Ishida et al.
patent: 5042437 (1991-08-01), Sakuragi et al.
patent: 5099806 (1992-03-01), Murata et al.

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