4 together with the screw inspection W岌's big skin accident Dongfeng Hangzhou Automobile Co., Ltd. (310006) Zhang Quanzu According to relevant information, the accident caused by the driver's mishandling accounted for 70%~80% of the traffic accident, due to vehicle mechanical failure Accidents account for about 0% to 15% of traffic accidents, so it is the primary condition for drivers or repairers to firmly establish traffic safety awareness and make proper vehicle maintenance work to avoid or reduce traffic accidents. The author below introduces a major traffic accident caused by bolts.
In March 1998, a Dongfeng semi-trailer tanker loaded with 8t of gasoline was tipped over at a corner of Fuyang Xindeng, Hangzhou, due to out of control and rushed into the gully. The accident caused great panic and tension. Fortunately, the traffic police detachment and the fire brigade rushed to the scene to block the treatment, otherwise the consequences were unimaginable. The author was fortunate to be entrusted by the Hangzhou Traffic Police Brigade, and to use the timing light, whether the timing mark on the correction is aligned with the mark on the crankshaft pulley. The ignition advance angle of the ZI7 engine is 5* angle as shown.
2.2 Adjustment of ignition timing 217 engine ignition timing is adjustable. If the ignition advance angle does not match the specified value, loosen the distributor fixing screw and turn the distributor body + to adjust the ignition advance angle to the specified value. (: The 2002 expert conducted a technical analysis and identification of the cause of the vehicle accident.
The following conclusions were drawn from the detection of the scene of the accident and the vehicle in question.
The bolts of the cab assembly have been loosened, and the center of the cab suspension suspension positioning center is seriously worn, resulting in a 36mm rearward movement of the cab assembly; the sliding fork telescopic limit of the steering transmission shaft assembly is ±40mm, and the spline The effective engagement surface of the sleeve with the spline portion of the steering transmission shaft is only 1/10 of the original normal engagement, so that the steering transmission shaft is approaching the disengaged and uncontrolled state.
The connecting shaft of the transmission shaft universal joint fork and the steering gear input shaft (the horizontal lock should play the role of preventing the axial pull-off in the semi-circular groove of the steering input shaft), and the ordinary bolts with different performance and specifications are mistakenly adopted, and Compared with the standard screw of the original car, the screw diameter, hardness and tensile strength are relatively small; the bolt thread is obviously deformed and the triangular spline impact impression of 1.5 mm deep in the middle of the screw indicates that the bolt is axially pulled off. The locking effect has been completely lost.
It can be seen from the above analysis that the cause of this mega-traffic accident is improper maintenance of the vehicle and maintenance errors, which is directly related to the lack of safe driving awareness and basic maintenance knowledge of the driver and the repairman. Through this case analysis, we are warned about the following two points.
The key parts of the car (steering, braking), even if it is a small bolt, must not be replaced by ordinary bolts. Only standard bolts for automobiles can be used. The appearance of the standard bolt for automotive use is characterized by its galvanized appearance and a permanent marking of “0†at the end of the tail. The performance rating is 8.8, while the normal bolt is not.
The repair work of the vehicle must be done carefully. If there is abnormal situation of steering and braking in the traffic, it is necessary to stop and check the cause. After the safety treatment, Sfi1 will drive; if the fault cannot be handled, it should be turned to the auto repair department or relevant experts, and do not care or have a chance to Knowing safe driving "This truth is exchanged by millions of people for blood and life. It is by no means a "wall view" or dogmatism. To truly understand and implement it in actual action, it can be foolproof.
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