Assembly of a plurality of collars and variable valve actuation mechanisms on a shaft

摘要

An engine variable valve actuation mechanism that substantially equally adjusts the valve lift amount in each cylinder. The mechanism includes variable valve lift mechanisms (120) respectively arranged in association with the engine cylinders. A control shaft (132) extends through the variable valve lift mechanisms. An actuator (100) moves the control shaft in the axial direction and drives the variable valve lift mechanisms. Collars (164,166) are arranged alternately with the variable lift mechanisms. Each collar includes a cylindrical sleeve (164a,166a) and flanges (164b,166b)formed integrally with the sleeve. The flanges directly or indirectly contact the end faces of adjacent variable valve lift mechanisms. This determines the positions of the variable valve lift mechanisms with respect to one another in the axial direction.