Position measuring device of electromagnetically operated engine valve drive system and method for attaching the same

摘要

An engine valve (6) such as an intake valve or exhaust valve is driven to open or close a corresponding intake or exhaust port by attracting an armature (1) onto one of first and second electromagnets (2, 3) and a position of the armature, viz., the position of the engine valve is measured by a permanent magnet (7) and a Hall effect device (8). An adhesive layer (9) whose hardness is lower than the drive axle (5) is used to attach the permanent magnet (7) onto the drive axle (5).