Research And Development Of Tractor Dual Clutch CAD System

The rapid development of agricultural production has put forward higher requestin to tractor speed and manipulating performance in various working conditions, domestic tractor used mostly traditional manual mechanical transmission, which has poor smooth shift, and affects the ride comfort greatly. Dual clutch type automatic transmission inherited traditional mechanical transmission's parallel axis structure can finish shift in the condition of not interrupting power, and it also has high fuel efficiency, all of these greatly satisfy the tractor's operational requirements. At present, the dual clutch type automatic transmission has been used more widely in cars, but its research on tractor is still blank stage. Research and development of double clutch type automatic transmission has a profound significance to improve the security, fuel economy and ride comfort of tractor.Dual clutch is the most important part of dual clutch automatic transmission, the text presents design methods of each parts in Dual clutch, which is based on the traditional clutch design and combining with dual clutch characteristics, process of selecting experience parameters and checking structure is also included.According to the function that dual clutch CAD system have to achieve, this text devised a system software interface for design, provide designer with visual impression. The overall structure and parametric steps are presented, summarized the program flowcharts which can realize the optimal function of software, in a follow-up procedures of compiling program, the flowcharts is transformed into the corresponding program code.The involute spline tooth profile that uses its centerline for Y coordinate is established, after analyzing various of API functions, using VB6.0 to compile and debug, successfully implement automatic 3d graphics of structures that contain spline such as friction plates, steel plates, and intermediate support body.Using SolidWorks second development function and the geometric constraint and the size constraint that are obtained in the process of structural design, developed a dual clutch CAD system. This can realize input the basic parameters, output each part's three dimensional graph, and automatically generate assembly body and two-dimensional engineering graphics. Dual clutch type automatic transmission whose engines is 37KW, input shaft speed is 2000r/min has completed output of 3d drawing, whole assembly body and two-dimensional engineering graphics , and it will be delivered to factory for research .Tractor dual clutch CAD system has concise interface, simple operation, and high precision of calculation and 3d model checking, it has realized the functions of inputting basic parameters, outputting 3d map, assembly body and two-dimensional engineering graphics, the system can also improve the efficiency of the dual clutch design, reduce design cost and shorten the product development cycle.