In last few years, one steam breaths out gear-box factory basis market demand, act on the principle of generation of research and development, production generation, reserve generation, research and development gives an user to be badly in need of 7 block series gear-box. Be aimed at the development trend of market of domestic heavy-duty truck, project approving research and development applies to 8~15 ton the 7 blocks 120Kgm gear-box of serious check. Try through research of nearly one year, trial assembly, road, CA7S-120Kgm gear-box passed Jinan car to detect recently of the center all sorts of detecting. CA7S-120Kgm gear-box passed evaluation of computation of structural design, intensity, program in May last year, devise plan finally certainly. Product fixed position is in match 240~300 horsepower engine, suit China the road condition, economy that accords with current user to use a requirement is practical model gear-box. Trial-produce will give the first prototype last year in October, many rounds of bench test that passes 3 months and repeatedly meticulous design is optimized with improve rise, overall this year in Feburary life test of the fatigue life test that passed lab of this factory product, synchronized shift gears, static twist pressure test and noise experiment. Detected in Jinan car this year in April the center passed noise smoothly to measure, static twist life test of pressure test, synchronized and gear exhaustion life test. Examine through practice, CA7S-120Kgm gear-box accords with QC/T29063-1992 " condition of technique of assembly of car mechanical transmission " requirement. CA7S-120Kgm gear-box is challenge that breaths out gear-box factory to one steam, its derive this factory is a lot of the advantage of the product, capture to what the weak point of congener product had one by one, eliminated from structural design before the insufficient place of the product. In phase of prototype bench test, the improvement that undertakes for many times to the component such as housing, gear, oil pump early or late is designed, make this product more reliable, ensure user course of development of life of 300 thousand kilometer. Its trial-produce is successful, be sure to bring new economic benefits to this factory. CNC MillingCNC Machining