Pre-tightening mechanism and retractor

Abstract

The invention discloses a pre-tightening mechanism and a retractor. The pre-tightening mechanism comprises: a pre-tightening wheel, a pre-tightening pipe, and a driving mechanism, a pre-tightening assembly and a guide structure which are sequentially arranged on the pre-tightening pipe; the driving mechanism is arranged at the starting section of the pre-tightening pipe; a pre-tightening pipe opening is formed in the peripheral surface, close to the pre-tightening wheel, of the tail section of the pre-tightening pipe; the pre-tightening assembly is arranged on the side, close to the opening ofthe pre-tightening pipe, of the driving mechanism. The guide structure is adjustably arranged on the side, away from the opening of the pre-tightening pipe of the pre-tightening assembly, of the pre-tightening assembly and provides a guide distance acting with the peripheral face of the outer edge of the pre-tightening wheel for the pre-tightening assembly so as to change the pre-tightening position, acting on the pre-tightening wheel, of the pre-tightening assembly. Only the tail section of the pre-tightening pipe is provided with the opening, so that the overall structure of the pre-tightening pipe is simplified; the guide structure is arranged at the position of the opening of the pre-tightening pipe, so that the pre-tightening assembly can accurately slide into the pre-tightening position of the pre-tightening wheel through the guide structure, the pre-tightening assembly and the pre-tightening wheel can be accurately locked, and the stability of the pre-tightening performance isimproved.

Description

technical field [0001] The present application relates to the technical field of automobile equipment, in particular to a pretension mechanism and a retractor. Background technique [0002] The seat belt retractor refers to the seat belt retractor with emergency locking function. It is the core component of the car seat belt. The retractor is the core component of the car seat belt. The space for people to move and buffer is quite small. At this time, it is necessary to consider firmly fixing the person on the seat first, and then use the force limiting device to minimize the injury. The pre-tensioning device ignites the gas generator within a few milliseconds through the collision sensor, and pushes the pull-back device to pull back the webbing, binding the person to the seat. [0003] At present, the main demand in the market is the pre-tight force-limiting retractor. After the pre-tight force-limiting retractor has been used in the domestic market for many years, the per...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the air pressure generated by the ignition of the gas generator pushes the preload ball through the pipe of the preload tube and slides into the ball recess on the outer peripheral surface of the preload wheel, so that when the preload tube is assembled with the preload wheel, The structure of the corresponding setting is more complicated

Moreover, due to the strong air pressure generated by the ignition of the gas generator, the preloaded ball slides into the preloaded position of the preloaded wheel through the pipe of the preloaded tube, and there may be a deviation, which in turn affects the locking of the preloaded wheel

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