VALVE TIMING ADJUSTING DEVICE

摘要

A valve timing adjusting device, comprising energizing means which is installed at the end part of a cam shaft having a plurality of cams opening and closing an intake valve or an exhaust valve of an internal combustion engine, controls the opening and closing timings of the intake valve or exhaust valve through a tappet, and energizes the cam shaft in spark-advancing direction with an energizing force equal generally to a peak value of a frictional torque produced by a force of friction between the cam shaft cams and the tappet or with an energizing force smaller than a peak value of the frictional torque.