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US 4,539,951 AGranted
Variable valve timing mechanism
AssigneeNissan Motor Co., Ltd.
InventorsSeinosuke Hara, Kazuyuki Miisho, Yasuo Matsumoto, Yasuo Yoshikawa
Life of this patent
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Abstract
An angular position of a lever with which a rocker arm contacts to define a fulcrum therebetween is varied by rotation of a cam which is installed in a manner to be rotatable relative to its cam shaft and drivingly connected through a spring to the cam shaft or to an output shaft of a driving system.
Claims25
A variable valve timing mechanism for a valve of an internal combustion engine, comprising:
- a lever pivotally mounted at one end thereof;
- a rocker arm engaging said lever to define fulcrum therebetween;
- a cam shaft located adjacent the other end of said lever;
- a cam having a hole through which said cam shaft extends in a manner to allow said cam to be rotatable relative thereto, said cam engaging said other end of said lever and rotatable to vary an angular position of said lever relative to said rocker arm for thereby varying the timing of said valve;
- driving means for driving said cam in accordance with engine operating conditions and including a rotatable output shaft;
- and
- resilient means for resiliently transmitting rotational motion of said output shaft to said cam so as to cause rotation of said cam in response to rotation of said output shaft when said rocker arm assures a predetermined position being in non-actuating contact with said valve.
4 more elements
Dependencies are inferred from the claim text.