The Feasibility Study Of Motor Mounted On Frame Of Driving-Car In Metro Train

With the continuous development of the city, city scale expands unceasingly; accelerating the integration of urban and rural areas, as well as the design of the metro line, need of metro vehicle has higher speed and better curve passing ability. And with the increase of vehicle speed and curve radius is smaller, the force between the wheel and rail increases, the force between the wheel and rail directly affect the metro vehicle running safety, comfort and economy. So in the metro, traction motor adopts suspension mode, reducing the unsprung mass, can reduce the wheel-rail action force, and improve vehicle curve negotiation performance. So the research on the feasibility of using suspension traction motor in subway train in is very necessary.In this paper, using SIMPACK software, based on the existing subway structure parameters were established for traction motor axle suspension and traction motor frame suspension two dynamics simulation model, and the dynamic properties were calculated, the calculated two models the dynamics performance results were compared and analyzed. The study found the metro vehicle suspension motor on frame, dynamic performance on the whole is better than that of the metro vehicle motor axle suspension, especially in the wheel-rail action force index, wheel-rail action force decreased significantly; but in the individual vertical dynamic index slightly worse than the metro vehicle suspension of motor shaft. Motor frame suspension vehicle differential force index to a shaft of a motor vehicle with vertical suspension stability, motor vertical acceleration and the rate of wheel load reduction, the effects of suspension parameters of these dynamics performance (vertical stiffness of primary suspension, vertical damping of primary suspension, vertical stiffness of secondary suspension, vertical damping of secondary suspension) were calculated and analyzed, and give the suggestion value of suspension parameters.It shows that with the anti-roll bar stiffness increases, the vehicle overturning resistance performance is improved while the riding comfort of vehicle brings more negative. While the metro vehicles with motor frame suspension mode, even if not device anti-roll bar, the dynamic performance is still good, suggestions cannot install anti-roll bar to simplify the bogie structure, reduce the bogie quality and repair costs.Motor suspension of metro vehicle target is to improve the operation speed and the performance negociation small radius curve. But when the subway vehicle speed to run at a higher and a smaller radius of curve, suspension on steering between the motor and the wheel frame will have a relatively larger displacement. Through the calculation of the vehicle at different speeds on curves running coupling horizontal and vertical displacement of metro vehicle, analysis the existing drum tooth coupling is suitable for this study. Through the study, the vehicle in the range of speed and radius of curve design through the curve, horizontal, vertical coupling to the displacement of the maximum value in the existing drum tooth coupling allows the range of motion. Therefore, the existing drum tooth coupling can be applied to the motor suspension of metro vehicle, without further design improvement.