| 摘要 |
<p>PURPOSE:To aim at improvement in durability, by installing a driving device, which makes a cam member shift to a driving position, where a valve member is drive by rotation of the cam member, and a nondriving position where the valve member is not driven, in the axial direction, while installing a base circle part in the cam member. CONSTITUTION:A cam member 2 is locked to a camshaft 1, while a cam member 3 is installed there free of slide motion in the axial direction but relatively unrotated. And, this cam member 3 makes a pair of plungers 28 shift to the right by what these plungers press the side of the cam member 3 at the time of pressure oil being taken in the oil passage 24 formed in a central part of the camshaft 1, making them possible to be solidly rotated with the camshaft 1. And, at the time of nonintroduction of the pressure oil, the cam member 3 is made going to the left by a pair of springs 33 via a plunger 35, making a valve 5 keep in a nondriving state. In addition, when the cam member 3 is in a nondriving position, a base circle part 36 is installed at the side of the cam member 3 in succession to the cam member 3 in order to a restraint of the valve 5.</p> |
