Patent ID: 7497192

Claim:
A variable valve system for varying an operation condition of an engine valve that is biased in a valve closing direction by a valve spring, comprising: a valve lift degree varying mechanism that varies the operation condition of the engine valve in accordance with an angular position assumed by a control shaft; an actuating mechanism that controls the angular position of the control shaft in accordance with an operation condition of the engine, wherein a mounting member is constructed to constitute part of the actuating mechanism, wherein the mounting member is connected to one end of the control shaft to rotate therewith, and wherein the mounting member is fixed to the one end of the control shaft by a plurality of bolts; a non-magnetic member connected to an axial end of the mounting member that faces away from the control shaft; a permanent magnet piece fixed within the non-magnetic member; and a sensing device that senses a rotation condition of the permanent magnet piece;