| 摘要 |
An arrangement for shifting at least a first cam piece 11 axially along a camshaft 7 of a valve train assembly 5 comprising a shifting member 51 arranged substantially parallel with the cam shaft and moveable to cause the first cam piece to be moved between a first axial position and a second axial position. The shifting member may be arranged inside an inner bore of the camshaft (figure 6) or arranged outside the camshaft (figure 17). Preferably there is an actuator 170 comprising a pin 172 for acting on a groove 175 formed on a component, for example a further cam piece 163, mounted on the camshaft, the component being arranged to act upon the shifting member 174 which in turn moves additional cam pieces. The cam pieces may comprise axial positioning pins for engaging formations on the cam shaft. The arrangement negates the need for a separate actuator for each cam piece. |
