Valve operating apparatus for internal combustion engine

Details Valve operating apparatus for internal combustion engine Valve operating apparatus for internal combustion engine

1995-04-25

1996-07-23

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9044, F01L 1300

Patent

active

055379621

ABSTRACT:
A valve operating apparatus for driving intake valves and exhaust valves of an internal combustion engine has a valve operating cam and a rocker arm unit. The rocker arm unit is made up of driving rocker arms which operatively contact the valves, a free rocker arm which is free from contact with the valves, and a changeover mechanism for varying the valve lift amount and timing of opening and closing the valves by connecting the rocker arms and releasing the connection between them. The free rocker arm is urged by a torsion spring so as to operatively contact the valve operating cam. The torsion spring is disposed inside a hollow rocker arm shaft of the rocker arm unit. In case the free rocker arm is fixed to the rocker arm shaft, a coil spring is disposed inside a supporting portion for rotatably supporting the rocker arm shaft such that the free rocker arm is urged by the coil spring via the rocker arm shaft.

REFERENCES:
patent: 2100057 (1937-11-01), Krebs
patent: 4354460 (1982-10-01), Mae et al.
patent: 4448156 (1984-05-01), Henault
patent: 4787346 (1988-11-01), Ajiki et al.
patent: 4957076 (1990-09-01), Inoue et al.
patent: 4970997 (1990-11-01), Inoue et al.
patent: 5239952 (1993-08-01), Morita
patent: 5273006 (1993-12-01), Schapertons et al.

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