Recently (July 15th), the US Consumer Safety Commission (CPSC) issued a recall notice, the famous bicycle brand SPECIALIZED announced the recall of 6,500 pedal extensions, which is also the fifth time in the US bicycle products this year. A recall caused by a firmware quality issue.
Fasteners are a class of mechanical parts that are used for fastening and are widely used. There are 13 types of bolts, studs, screws, nuts, rivets, pins, etc., but the quality defects of this inconspicuous small part can Lead to high risk of use.
Up to now, CPSC has released 13 bicycle product recalls this year, and 5 of them have been caused by fasteners. In addition to the pedal extension pipe, the other four are the first pipe connection bolts and before the shock absorber. Damage caused by fork bolts, front forks and brake couplings, axle flanges, and 8 of the 41 incident reports received by CPSC caused injuries.
In the five notifications, fastener breakage is the main problem of feedback. In general, fasteners, especially bolt breaks, have many possible causes, including stress, fatigue, corrosion, hydrogen embrittlement, etc., from reported accidents. It is seen that most of the fractures are medium and high-grade mountain bikes and their accessories. The rider has a high intensity of use, because of the possibility of breakage due to stress and fatigue, especially when the fork is riding in the mountains, the fasteners are repeatedly subjected to The tensile load and the shear load are likely to occur when the maximum design load is exceeded or the peak load is repeatedly applied.
Therefore, it is recommended that domestic exporters can improve the safety factor of fastener design when designing high-grade mountain and BMX and other strong bicycles. The joint design is as simple as possible and appropriate additional processing to enhance fatigue resistance and prevent smallness. The big risk caused by fasteners.
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