| 摘要 |
A valve timing control device for an internal combustion engine, comprises an engine synchronous rotary member, such as a timing sprocket, timing pulley and so forth, driven by an engine output in synchronism with engine revolution, and a camshaft. The device also has first means disposed between said engine synchronous rotary member and said camshaft for causing relative angular displacement between said engine synchronous rotary member and said camshaft synchronous rotary member in a first dislacement direction for retarding valve timing and interlocking said camshaft and said engine synchronous rotary member for preventing relative angular displacement in a second displacement direction which is opposite from said first direction, for advancing valve timinmg, and second means disposed between said engine synchrous rotary member and said camshaft for causing relative angular displacement between said engine synchronous rotary member and said camshaft synchronous rotary member in said displacement direction for advancing valve timing and interlocking said camshaft and said engine synchronous rotary member for preventing relative angular displacement in said first displacement direction for retarding valve timing. Third means is provided for selectively activating one of said first and second means in response to the engine driving condition for retarding and advancing phase relationship between said engine synchronous member and said camshaft.
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