Knee structure for crash dummy and adjusting method

Abstract

The invention relates to the field of automobile safety collision test dummies, in particular to a knee structure for a collision dummy and an adjusting method. The knee structure comprises an upper leg bone connecting piece, a friction plate, a center connecting block, a connecting rod, a lower leg bone connecting piece and a cover plate, the upper leg bone connecting piece can rotate around the friction plate and the center connecting block and move up and down, and the center connecting block is provided with a first ball sleeve, a first elastic piece, a first pressing plate, a second ball sleeve, a second elastic piece and a second pressing plate; the top end of the connecting rod is arranged in the center connecting block and connected with the first ball sleeve and the second ball sleeve. A first limiting piece is further arranged at the top end of the connecting rod, and the top end of the connecting rod can rotate around the first limiting piece. The knee structure can reproduce all degrees of freedom of the knee joint of a human body, can reflect the stress mode of the knee in the collision process, more accurately evaluates the collision injury of a vehicle to a pedestrian, and improves the effectiveness of a collision test.

Description

technical field [0001] The invention relates to the field of automobile safety collision test dummy, in particular to a knee structure and adjustment method for a collision dummy. Background technique [0002] As the number of cars in our country increases year by year, traffic accidents also increase sharply. Traffic accidents in which pedestrians and vehicles collide directly account for a large proportion of them. In such forms of traffic accidents, the knee is often the part of the human body that suffers the most damage. At the same time, the knee joint is the most complicated joint in the human body. Its treatment and rehabilitation The process is lengthy and expensive. [0003] In order to improve the safety of automobiles against pedestrian collisions, special-purpose pedestrian standing posture collision dummy is now used for relevant collision tests, and the degree of damage caused by vehicles to pedestrians' lower limbs is evaluated through tests through tests. ...

AI Technical Summary

Problems solved by technology

Because the existing pedestrian collision dummy greatly simplifies the knee joint, it can only achieve a single bending degree of freedom and is rigidly connected, and cannot simulate the knee lateral collateral ligament, medial collateral ligament, anterior cruciate ligament and The way the posterior cruciate ligament is stressed, it is impossible to accurately evaluate the collision injury of the vehicle to the pedestrian

In the testing of pedestrian protection regulations in various countries, the throwing leg type (TRL Pedestrian Legforms, aPLILegfom) is mainly used for safety testing. The knee ligaments are replaced by cables. On the one hand, the strength of the ligaments cannot be adjusted, and the overall dummy cannot be realized weight support; on the other hand, this test method of substituting parts for the whole cannot truly reflect the overall impact response of pedestrians.

CN200610011609.4 proposes a four-freedom dummy knee joint mechanism for human body collision protection tests. First, the mechanism cannot truly reproduce the human knee’s six-degree-of-freedom motion response state. Secondly, the mechanism also uses cables to simulate knee ligaments. The leg type also has the technical problems of the above-mentioned throwing leg type test

Images