Engine valve system

A valve system for an engine which comprises an engine block, the valve system comprising:

• two cams which are coaxially mounted, each of the two cams comprising a follower;
• a summation lever coupled to each follower of the two cams, the summation lever being configured to perform a pivoting movement and to be movable in proportion to a sum of an instantaneous lift of each of the two cams;
• a hydraulic lash adjuster;
• a valve actuating rocker arranged to be pivotably coupled to the summation lever and to rest on the hydraulic lash adjuster, the valve actuating rocker being configured to operatively displace an engine valve in dependence upon a movement of the summation lever;
• a control spring configured to urge the summation lever in a direction to compress the hydraulic lash adjuster;
• a stop configured to limit an expansion of the control spring;
• a bore arranged to be stationary relative to the engine block;
• a plunger comprising a shoulder and an end, the plunger being arranged to reciprocate linearly within the bore;
• and
• an abutment surface arranged to be stationary relative to the engine block,
• wherein,
• the control spring is further configured to act on the summation lever via the plunger,
• the end of the plunger is arranged to be in a sliding engagement with the summation lever, a point of contact between the plunger and the summation lever being displaced in a direction transverse to an axis of the plunger during the pivoting movement of the summation lever,
• the shoulder of the plunger is arranged at a predetermined distance from the end of the plunger, and
• the shoulder of the plunger is configured to contact the abutment surface to limit a displacement of the plunger in a direction to compress the hydraulic lash adjuster.