| 摘要 |
Industrial field of utilization: the present invention relates to a device for changing the operation timing of suction and exhaust valves of a four cycle engine, and more particularly to a device for changing a timing at which the operation of a cam is transmitted to a valve and a valve lift. Problem: an object of the present invention is to provide a variable suction-exhaust device simple in construction and capable of effecting suction and exhaust in accordance with an engine speed. Means for solving the problem: a suction and exhaust valve control device for a four cycle engine comprising a cam (1) for determining the operation timing of at least one of suction and exhaust valves and a valve disc (8, 14) adapted to be operated by being pressed down in accordance with the rotation of the cam to thereby press down at least one of the valve discs of the suction and exhaust valves, wherein a cam follower (2) or the cam follower and a rocker arm (5, 15) are inserted between the cam and the valve disc, the cam follower being adapted not only to transmit the cam operation of the cam to the valve disc but also to be able to change its attitude in accordance with an external force so as to change the contact position relative to the cam to thereby change a timing at which the cam operation of the cam is transmitted to the valve disc and a valve lift.
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