Highly effective pre-tighter for pre-tightened safety belt

Abstract

The invention discloses a high-efficiency preloading device for preloading safety belt with simple structure, small cubage, low cost and high power transferring benefit. The invention comprise piston bar, guide head of piston bar, cylinder, gas generator, signal wire of gas generator, connecting rope, core shaft of scrolling device, power wheel, stopping claw, base and sliding way of piston bar. When vehicle impact happens sensor transfers contact signal to gas generator so as to generate blasting. Generated high-pressure gas pushes the piston bar in cylinder and the guide head of piston bar move and the connecting rope is pushed to move. The connecting rope draws the power wheel rotate. When the power wheel rotates the stopping claw is driven to move together and extrudes towards to inside. Extruded stopping claw makes the power wheel and the end of core shaft of scrolling device lock together so that the core shaft of scrolling device rotate in phase as the power wheel rotate and safety belt on it returns so as to draw crewman back and eliminate crewman gap. The preloading purpose is achieved and protecting effect of safety belt is improved.

Description

technical field [0001] The invention relates to a pretensioning device for a safety belt, in particular to a pretensioning device for a safety belt on a driver's or a passenger's seat. Background technique [0002] In the prior art, generally, for the comfort of the occupants, the retracting force of the seat belt cannot be too large; however, if the gap between the seat belt and the human body is too large, in the event of a collision, this existing gap will be reduced. The effective range of the seat belt is small, and the effectiveness of the seat belt is reduced. The pre-tightening seat belt uses a pre-tightening device. When the collision reaches a certain level, the pre-tightening device is activated to drive the reel mandrel to rotate in the opposite direction, shortening the seat belt webbing by a certain distance, and effectively eliminating the gap between the human body and the seat belt. The effectiveness of the seat belt is thus increased. But existing seat be...

AI Technical Summary

Problems solved by technology

[0003] 1. Poor reliability: To achieve a certain effective effect, the pretensioning device must ensure that the reel rotates in the opposite direction for a certain number of turns, generally 0.9 to 1.2 turns. To achieve the specified number of turns, the movement of the piston must have a certain stroke , but due to the limited space on the vehicle for installing seat belts, a speed change mechanism is used to lengthen the effective stroke of the piston. For example, the pre-tensioned seat belt produced by TRW Company of the United States uses gear shifting to lengthen the effective stroke of the piston. ; Although the speed change structure can increase the stroke, due to the complex transmission of the speed change mechanism, especially due to the need for multiple gears to be connected with each other, any one of the gears or the central axis of the gears will be damaged during the collision process, which will reduce the effectiveness of the seat belt. The function will even lose the safety belt and lose its protective effect, so the reliability is poor;

[0004] 2. Too many parts and high production cost: Due to the complex structure and many parts of the existing technology, the production cost increases;

[0005] 3. Complex structure and high production process requirements: due to the many parts and high precision requirements of the product, the production process requirements are high;

[0006] 4. The volume is too large: Although the length of the pre-tensioning mechanism is reduced by the speed change mechanism, the volume of the product is increased at the same time, which brings inconvenience to the actual use and installation

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