Variable valve operation control apparatus

摘要

In a variable valve operation control apparatus, an exhaust camshaft and an intake camshaft are held non-movably and movably in the axial direction, respectively. The intake camshaft has a profile varying in the axial direction. A timing pulley and the exhaust camshaft are fixed by a bolt to drive the exhaust camshaft by a crankshaft. A vane rotor is fixed to the exhaust camshaft, while a shoe housing and a gear are held rotatably relative to the vane rotor. Torque gears are provided on the intake camshaft to rotate with the intake camshaft. The rotational phase of the intake camshaft relative to the crankshaft is adjusted by hydraulically varying the rotational phase of the shoe housing relative to the vane rotor.