The invention relates to a piston for a pre-tightening safety belt, a safety belt retractor and the pre-tightening safety belt. The piston includes: a piston seat including a front surface and a first recess recessed from the front surface; and a piston head which is fitted to the front side of the piston seat and includes an abutting surface abutting the front surface, and the front side of which is provided with a second recess. The piston is provided with a pressure control mechanism, and the pressure control mechanism is configured to stop airflow from flowing forwards when the gas pressure on the rear side of the piston seat is smaller than a preset value; when the gas pressure on the rear side of the piston seat is larger than or equal to a preset value, an airflow channel is formed and is suitable for deflecting airflow and allowing the airflow to flow towards the front of the piston. The piston has a good sealing characteristic, can realize pressure relief under an abnormal working condition, and is simple in structure, convenient to manufacture and lower in cost.

    本发明涉及用于预紧式安全带的活塞、安全带卷收器及预紧式安全带。该活塞包括:活塞座,其包括前表面和从所述前表面凹进的第一凹部;以及活塞头,其装配至活塞座的前侧并包括抵接至所述前表面的抵接面,并且其前侧设有第二凹部。该活塞设有压力控制机构,该压力控制机构配置成:当活塞座后侧的气体压力小于预设值时阻挡气流向前流动;当活塞座后侧的气体压力大于等于预设值时形成气流通道,该气流通道适于将气流偏转并允许气流朝向该活塞前方流动。这种活塞在具有良好密封特征的同时可以在异常工况下实现泄压,并且结构简单,制造方便,成本较低。


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    Title :

    Piston, safety belt retractor and pre-tightening safety belt


    Additional title:

    活塞、安全带卷收器及预紧式安全带


    Contributors:
    GUO XIN (author) / ZHAO WEI (author) / HUANG YONGLIANG (author)

    Publication date :

    2025-01-21


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR



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