Research On Green Cleaning Technology And Remanufacturability Of Used Car Transmission Box

The vehicle population of China has occupied second place in the world until August2014. As the number of end-of-life vehicle(ELV) rising, the used car processing problems has been highlighted. Continuously variable transmission(CVT) has been increasingly applied to vehicles of various models for years. Most of these vehicles have been identified as ELV. In order to deal with these problems properly, the out-of-service CVT must be remanufactured as soon as possible.This thesis focuses on the environmental-friendly cleaning and the feasibility of remanufacturing various kinds of the used CVT, as the followings:1) The technology feasibility, economic feasibility and environmental benefits of the used CVT remanufacturing have been analyzed on the foundation of reviewing the previous literature. The research of the remaining service life and environmental-friendly cleaner are summarized.2) The feasibility of cleaning oil fouling by extracting sapindus mukorossis is researched in this thesis, which proposes a novel solution for developing an environmental-friendly cleaning technology. The best prescription of sapindus mukorossi solution is researched through the orthogonal experiment approach with prescription quality concentration and temperature as variables.3) The remaining service life of the remanufactured CVT is researched in this thesis. The wear pattern and operation state of out-of-service CVT friction pairs is assessed by the ferrography technology. Then remaining service life of the remanufactured CVT parts is assessed using a combination of service life, service miles e.g. with the results from the ferrographie analysis, which provides a new approach of remaining service life assessment for the remanufactured CVT.4) The remanufacturing processes of CVT is researched and formulated in this thesis. In the case of the out-of-service RE0F10 A CVT, the parts of transmission are classified and analyzed in detail. The remanufactured CVT is assessed based on rig test after all remanufacturing procedures finished. The result shows that utilization rate of used parts is as high as 87%, which provides a typical example for out-of-service CVT remanufacturing.