Valve mechanism of internal combustion engine
AssigneeNissan Motor Co., Ltd.
InventorsMakoto Nakamura, Shigeru Sakuragi, Hiroshi Komatsu
Life of this patent
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Abstract
A valve mechanism of an internal combustion engine is of a type which has at least two cams for each intake (or exhaust) valve. One cam is shaped to allow the associated engine to exhibit a marked fuel saving characteristic and the other cam is shaped to also the engine to produce a higher torque at relatively low (or high) engine speed. Upon a cam switching between these cams, at least one of the cams is subjected to a phase change before and/or after the actual cam switching. As a result, the undesired shock at the cam switching is eliminated or at least minimized.
Claims24
A valve mechanism of an internal combustion engine comprising:
- first and second cams which are shaped to allow the engine to produce lower and higher output torques respectively;
- switching means for switching between the first and second cams in accordance with an operating condition of the engine;
- and
- phase changing means for changing the phase of at least one of said first and second cams one of just before and just after the cam switching is made by said switching means.
A valve mechanism of an internal combustion engine comprising:
- first and second cams which are shaped to allow the engine to produce lower and higher output torques respectively;
- judging means for judging the time when a cam switching between said first and second cams should be made in accordance with an operating condition of the engine;
- cam switching means for actually carrying out the cam switching based on an information produced by said judging means;
- and
- phase changing means for changing the phase of one of said first and second cams before the cam switching actually made by said cam switching means and changing the phase of the other of said first and second cams after said cam switching.
A valve mechanism of an internal combustion engine comprising:
- first and second cams which are shaped to allow the engine to produce lower and higher output torques respectively;
- judging means for judging the time when a cam switching between said first and second cams should be made in accordance with an operating condition of the engine;
- cam switching means for actually carrying out the cam switching based on an information produced by said judging means;
- and
- phase changing means for changing the phase of one of said first and second cams one of just before and just after the cam switching is actually made by said cam switching means.
Dependencies are inferred from the claim text.