Cam mechanism for low-vibration pneumatic motor-driven screwdriver includes cam body in three segments, which operates in four phases

摘要

The cam body has three segments. Phase A rises from the lower dead point to the upper dead point and controls the required torque. It has an external angle providing axial torque of 25% and radial torque of 75%. Phase B is a running track producing a stroke to the upper dead point, in order to retard the rapidly alternating frequency between the upper dead point and the lower dead point. Phase C falls from the upper dead point to the lower dead point, to reduce up and down vibration. Phase D is a displacement to the upper dead point, as a continuation of phase C.