Safety belt retractor with pre-tightening device

Abstract

The invention relates to a safety belt retractor with a pre-tightening device. The safety belt retractor comprises a frame, winding shafts and the pre-tightening device. The pre-tightening device comprises a round pipe, a U-shaped plate, a force transmission ball set, a rack, a gear, a sealing ball, a spring, a gas generator and a housing. The round pipe is linked with the U-shaped plate and then is fixedly arranged in the housing; the linkage portion of the round pipe and the U-shaped plate is a linear segment portion, and one end, not linked with the U-shaped plate, of the round pipe is provided with the gas generator; the spring is arranged at one end, stretching into the round pipe, of the gear generator; and a long groove is formed in the linear segment portion of the round pipe, and the rack is fixedly arranged in the long groove. The sealing ball and the force transmission ball set are arranged in the round pipe and located between the spring and the rack; the gear and the winding shafts are coaxially and fixedly connected; and when the rack is fixed through a shearing pin, the rack and he gear are in the non-meshing state, and when the rack descends, the rack can be meshed with the gear. A plurality of force transmission components are utilized for carrying out energy efficient transmission, the retracting stroke of a safety belt is increased, and the retractor is simple in structure and low in manufacturing cost.

Description

technical field [0001] The invention relates to a safety belt retractor, in particular to a safety belt retractor with a pretensioning device. Background technique [0002] The retractors of the existing pre-tensioning devices include the ones with simple racks to drive the gears to rotate, those with balls to push the gears, those with clutch mechanisms, and those with motors to drive the spools. These technologies are widely used in seat belt retractors, which have a good restraint on passengers. When the vehicle is in an emergency, the gas of the gas generator is used to make the reel of the seat belt retractor rotate in the direction of rewinding the seat belt, and the seat belt is rewound through the reel, so that the seat belt changes from slack to tension, thereby improving safety. Passenger restraint, protect the safety of passengers. However, the retractors with pre-tensioning devices in the past have defects such as short rewinding stroke, complex structure, diff...

AI Technical Summary

Problems solved by technology

However, the retractors with pre-tensioning devices in the past have defects such as short rewinding stroke, complex structure, difficult manufacturing, high processing difficulty, high cost, and excessively large retractor shape.

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