Patent ID: 8365691
Filing Date: 2013-02-05
Classification: F01L

Abstract:
1. An internal combustion engine having a valve mechanism comprising: two cams mounted coaxially; a summation lever having cam followers in contact with both cams, the summation lever being moveable in proportion to the instantaneous sum of the lifts of the respective cams; a control spring to maintain contact between one cam profile and its respective follower(s); and, a valve actuating rocker having a stationary pivot and rotatably connected to the summation lever which serves to open the engine valve in dependence upon the movement of the summation lever, so as to enable the valve timing, valve lift and valve event duration to be adjusted by varying the phases of the two cams; wherein the summation lever is constructed in two parts that can be selectively locked and unlocked to allow the valve lift to be deactivated and the motion of both parts is controlled by the control spring when the two parts of the summation lever are unlocked from one another.