Realize power transmission unit of ultralow fast operation in conventional transmission of special automobile

The utility model relates to a realize power transmission unit of ultralow fast operation in conventional transmission of special automobile. Including the box, be provided with input shaft, output shaft, jackshaft in the box, be provided with low -speed one -level driving gear and former fast one -level driving gear on the input shaft, be provided with the former fast gearshift that sets up withformer fast one -level initiative gear correspondence on the input shaft, be provided with on the jackshaft with low -speed one -level initiative gear correspondence's passive gear wheel of low -speedone -level and former fast one -level initiative gear correspondence's low -speed secondary drive gear, still be provided with the ultralow fast gearshift with the passive big gear correspondence oflow -speed one -level on the jackshaft, be provided with the passive gear wheel of low -speed second grade that corresponds with low -speed secondary drive gear on the output shaft, be provided with the front and back axle outp