ACCELERATION SENSING APPARATUS FOR TRIGGER OF PRETENSIONER

摘要

PURPOSE: An acceleration sensing apparatus of a trigger device for a pretensioner is provided to adjust sensitivity of trigger device by sensing acceleration with a cam combined structure. CONSTITUTION: An acceleration sensing apparatus of a trigger device(4) for a pretensioner is equipped to the pretensioner. The trigger includes a magnet(40,40') and a cam operating unit(60). The magnet is connected to an electronic control unit to supply power. A spacer(50) between a cock(10) and an initiator(5) is connected to the magnet. The cam operating unit has a mass body(65) to be connected to a cam(63) by a connecting rod(64). Therein, the cam to be arranged to a lower portion of the spacer is rotated by force of inertia. The magnet makes the cam rotate by acceleration of the mass body. The cam moves to an upper portion of the spacer. The cock penetrates a pin hole(51) of the spacer and the initiator is ignited. Thereby, sensitivity of the trigger device is controlled by acceleration of the mass body.