1 015301249AA AXIS - GEAR SHIFTING 2 015301239AA PALTE - INTERLOCKING 3 015301238AA FINGER - GEAR SHIFTING 4 015301268AA SEAT - SPRING 5 015301228AA SPRING - CONTROL LEVER 6 015301267AA SEAT - SPRING 8 015301259AA SPRING - CONTROL LEVER 9 015301233AA RING - O 10 015301232AA COVER - CONTROL LEVER 11 015301235AA LEVER ASSY - GEAR SHIFT The intermediate shaft is a shaft in the automobile gearbox. The shaft itself is integrated with the gear. Its function is to connect the first shaft and the second shaft, and select to mesh with different gears through the transformation of the shift lever, so that the second shaft can output different speeds, steering and torque. Because its shape is like a tower, it is also called "pagoda tooth". With the increase of the service life of the intermediate shaft, its natural frequency decreases slightly; The natural frequency of the intermediate shaft decreases by up to 1 2%, the decline amplitude of the first four natural frequencies is higher in the higher order than in the lower order, but the change of the decline rate is irregular; The surface hardness of different sections changes slightly, and there is a trend of first increasing and then decreasing; According to the changes of natural frequency and hardness of the intermediate shaft, it can be preliminarily inferred that the intermediate shaft has more than 60% of the remaining life, which is of recycling value. The ownership of China's automobile market is increasing, and it has exceeded 1.5% by the end of 2014 With 5.4 billion vehicles, the problem of vehicle recycling is becoming more and more important. In recent 10 years, the state has closely issued a series of favorable policies on automobile recycling and remanufacturing and resource reuse. The premise of recycling and manufacturing of end-of-life automobile parts is that they have sufficient remaining life and can enter the next round of service cycle. Therefore, the recyclability evaluation of end-of-life automobile parts is becoming more and more important.