Novel pre-tightening and force-limiting type seat belt retractor

Abstract

The invention relates to the technical field of automobile safety belt equipment, in particular to a novel pre-tightening and force-limiting type seat belt retractor. The novel pre-tightening and force-limiting type seat belt retractor comprises a core shaft mechanism, a coil spring mechanism, a pre-tightening mechanism, a frame assembly and a mechanical end cover; the core shaft mechanism comprises a shaft head, a ball wheel, a secondary force limiting ring, a torsion head, a torsion rod and a core shaft main body; the torsion rod and the core shaft main body are connected with each other ina nested manner; the torsion rod is connected with the shaft head through the torsion head; the secondary force limiting ring is positioned between the core shaft main body and the ball wheel; a limiting groove is formed in the torsion head; a limiting projection is arranged on the end surface, in contact with the ball wheel, of the core shaft main body; the secondary force limiting ring is woundin one direction along the limiting projection and the limiting groove; the torsion rod and the shaft head are stably connected with each other through the torsion head; a limiting groove is formed inthe torsion head; and the secondary force limiting ring can penetrate through the limiting groove. The stability of the connection between the torsion rod and the shaft head during twisting is improved, the torsion force generating effect of the secondary force limiting ring is improved, and the retractor is more stably locked.

Description

technical field [0001] The invention relates to the technical field of automobile safety belt equipment, in particular to a novel pre-tightening force-limiting safety belt retractor. Background technique [0002] The retractor with emergency locking function is the core mechanism of the car seat belt. After the seat belt is fastened, the retractor automatically tightens it. When the vehicle brakes suddenly or collides, the occupant will quickly and violently stretch the seat belt. At this moment, the self-locking function of the retractor can instantly lock the seat belt, so that the occupant can stick to the seat and avoid falling out. Injury from an accident or collision. [0003] The retractor mainly cooperates with the main body of the mandrel through the torsion bar and the secondary force limiting ring to form the secondary force limiting. The secondary force limiting ring can reduce the torsional force carried by the torsion bar to ensure the stable operation of the ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of this application is to provide a new type of pre-tightening force-limiting seat belt retractor to solve the problem that the mandrel assembly in the prior art cannot limit the large torsional force in time, thereby causing the retractor to lock incorrectly. Stable, technical issues causing retractor lockup instability

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