| 摘要 |
To eliminate a play at connection portions in a valve characteristic varying mechanism (M) and to enhance the accuracy in control of valve operation characteristics. <??>A valve characteristic varying mechanism (M) of a valve system (40) comprises a valve cam (54) pivotally supported on a camshaft (50) so as to put an engine valve (24) into opening and closing operations, a holder (60e) pivotally supported on the camshaft (50), a control mechanism (M3) driven by a drive mechanism to swing the holder (60e) about the camshaft (50), and a rocker arm (66e) which is pivotally supported on the holder (60e) and which is swung by a drive cam (52) rotated integrally with the camshaft (50) to swing a valve cam (54) about the camshaft (50). The control mechanism (M3) and the holder (60e) are pivotally connected to each other at their connection portions, and the valve characteristic varying mechanism (M) comprises a pressing spring (55) for normally pressing the holder side connection portion against the control mechanism side connection portion in the swinging direction. <IMAGE>
|
