| ATV is a product between motorcycles and cars, which can freely walk in sand, swamps, sloping field and such complex pavement because of its unique structure. With the increase of consumers'demand and the realization of technology innovation, ATV developed rapidly. As one of the important parts of ATV, differential is mainly used to ensure ATV wheels in both sides to travel with different rotating speed in order to meet the requirements of kinematics and eliminate the incoordination of the both driving wheels on kinematics. Therefore, its performance has a direct influence on the dynamic properties of ATV.This article was based on the most representative Eaton differential, designed a mechanical locking differential applicable to large displacement ATV, detailed introduced the design method of differential gears, and did the design analysis for the key parts of the ATV differential, then did the strength calculation for them. The 3D model of the ATV differential was built using the software Pro/E, and then its whole virtual assembly was realized.This thesis introduced the data-shift method between the software ADAMS and Pro/E. And I transmitted the Pro/E model into ADAMS, added the restriction and the load on system,chose the impact-contact parameters of the gears, at last built the whole virtual prototype model of the ATV differential. Also I executed the dynamic and kinematic analysis for its several working conditions such as high speed straight line travel, low speed straight line travel, breaking away and cornering, and then I did the kinematic analysis according its self-locking and self-unlocking function. The analysis result not only provided some guidance to improve the mechanical transmission system dynamic performance and the design of its key parts, and also gave new method for the achievement of the load of gear and its fatigue life prediction, as well as offered basis for the optimization design of differential ATV.
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