关键词: 轻客车型；安全带锁扣；弯钩限位；正面碰撞；ECE R 137；Hybrid III 50th 假人

Abstract: For the design change of a certain light commercial vehicle type that eliminates the limit structure of the seat belt lock hook to improve the comfort of passengers lying flat, evaluate whether it still meets the requirements of ECE R 137 regulations for passenger protection performance in frontal collisions. The article selects three sets of driver's seat samples. Among them, two sets have the lock hook limit and shield structure removed, and are equipped with system components such as instrument panels, airbags, and seat belts. A slide test system is built in accordance with ECE R 137 regulations. A Hybrid III 50th dummy is used, and three repeated collision tests are conducted through high-speed camera and data acquisition equipment. The system analyzes the key injury indicators of the dummy. The results show that after the hook limit is removed, all the injury indicators of the dummies meet the regulatory requirements. The injury value of the head slightly decreases, while the injury values of the neck, chest and thighs remain stable. The test repeatability is good, indicating that the performance of the restraint system is not affected. The removal of the seat belt buckle hook limit structure, while ensuring collision safety, can enhance the comfort of occupants and provide a reliable basis for the design improvement of this model.

Key words: light commercial vehicle model; seat belt buckle; hook limit; frontal collision; ECE R 137; Hybrid III 50th percentile dummy