| 摘要 |
PURPOSE:To reduce the abrasion of valve stems by constructing rotating members to change contact positions between cam faces of cam shafts and tappet pressure-receiving parts for rotating rotate from standard positions where a tappet sliding direction accords with a valve movement direction at the time of low and high speed rotations. CONSTITUTION:In this control unit, when a reciprocating shaft 18 is moved to the right by a driving unit 19, rotating members 14 and 14' are oscillated round cam shafts 9 and 10 via oscillating shafts 17 and 17'. The contact positions between cam faces 9a and 10a and tappet pressure-receiving parts 13a and 13'a are changed to the delay side against a cam rotating direction X, and the valve timing of suction (exhaust) valves 5 and 6 are slided in the delay direction. The driving unit 19 keeps the rotating members 14 and 14' in a standard position where a tappet sliding direction accords with a valve movement direction at the time of medium speed rotation of an engine, and at the same time, it is controlled to rotate the rotating members 14 and 14' from the standard position by a control unit at the time of low and high speed rotations. |
