| 摘要 |
A drive cam 22 opens or closes an intake valve 12 via a variable mechanism 26, a split-type rocking cam arm 38, and a valve actuating mechanism 68. The variable mechanism 26 varies a position of an intermediate roller 34 corresponding to a rotating angle of a control shaft 24, thereby variably setting a lift amount of the intake valve 12. The split-type rocking cam arm 38 includes an input arm 42 and an output arm 46, and a connection selection mechanism 50 is disposed between the arms 42, 46. When the arms 42, 46 are connected together, the intake valve 12 performs an ordinary open/close operation. When the arms 42, 46 are disconnected, an input of the drive cam 22 is absorbed by a relative rocking motion between the arms 42, 46, so that the intake valve 12 is retained in a pause state. |
