Mechadyne International Limited

Kyle Webb

Ian Methley

Timothy Mark Lancefield

Mark Walton

A summation rocker system is disclosed for acting on the end of a stem of a poppet valve () in dependence upon the combined lifts of a first and a second cam profile defined by different cam lobes () of a concentric camshaft (). The system comprises a first rocker () mounted on a pivot shaft () and having a first follower () to contact the first cam profile and an end acting on the valve () to displace the valve () by an amount dependent upon the lift of the first cam profile, a rocker shaft () to be fixedly mounted on the engine, and a second rocker () pivotable about the rocker shaft (), the second rocker () having a second follower () to contact the second cam profile and acting to displace the pivot shaft () of the first rocker () in dependence of the lift of second cam profile. The rocker shaft () intersects a plane containing the axis of the pivot shaft () and the end of the first rocker () acting on the valve stem, and the first rocker () includes a cut-out () for receiving the rocker shaft (), which cut-out () is configured and dimensioned to prevent the rocker shaft () from interfering with movement of the first rocker ().

Variable valve lift system

A valve system for an engine includes two cams each having a follower, a summation lever coupled to the followers, a lash adjuster, a valve actuating rocker pivotably coupled to the summation lever and resting on the lash adjuster, a control spring urging the summation lever to compress the lash adjuster, a stop limiting an expansion of the control spring, a bore, a plunger which moves in the bore, and an abutment surface. The control spring acts on the summation lever via the plunger. A plunger end engages with the summation lever. A point of contact between the plunger and the summation lever is displaced in a direction transverse to a plunger axis during a pivoting movement of the summation lever. A plunger shoulder is arranged a distance from the plunger end to contact the abutment surface to limit a plunger displacement in a direction compressing the lash adjuster.

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Abingdon, United Kingdom

Kyle Webb