Theoretical And Experimental Investgation To Discus-like Gear Differential For Vehicles

With the increasing usage of new energy and hybrid vehicle.More and more devices were equipped on vehicle such as extra power train and batteries which dramatically increased the mass of vehicle and directly infect the driving efficiency.Vehicle light weight design become essential.Till now,the light weight technical is mainly used on the frame structure,using aluminum or other compound material to replace the steel parts.But,there is always no efficient way to optimize the power train and transmission.Once the vehicle frame light weight works complete,people turn their focus to the transmission.To reduce the transmission weight,this article investigate a new kind of light weight differential.The differential and final gear is the last stage of transmission.Traditional conical gear differentials have no longer benefit to new energy vehicles in drive line size,weight and general sketching.The internal conical gears need lot of space to be arranged,which finally formed a huge gear package on the outside of differential,and this kind of structure is hardly to be optimized for light weight design.The construction of new compact discus-like gear differential is totally different from the traditional conical gear differential.The theory of new differential is the spur gear differential.using 2 sets of planetary gear to realize the speed difference.By using modified teeth profile,all the gears can be arrange inside the final ring gear,which greatly decrease the axial size and volume.Comparing with conical differential,the new discus-like differential can realize all the function of conical gear differential,and will be 50% lighter and 70% shorter(on the axial size).meanwhile it can sustain the same torque input.This feature is very helpful to the power train light weight design.The new differential can be arranged on axle and center.The compact design feature has advantage to be arranged in EV and other new energy vehicle.