Analysis Of Gasket-selection For Driving Taper Assembly Of Automobile's Driving Axle And The System Development

Driving taper assembly of automobile's driving axle is a crucial part for the transmission system. Its Assembly quality has an important influence on the performance of the whole automobile, and how to guarantee a suitable pre-tightening force of the bearings is a key technology in the process of the driving taper assembly. Adjustable gaskets selecting between bearings in the process of the driving taper assembly is studied in this dissertation. The main content of this dissertation is as follows:The structure and assembly technology of the driving taper Assembly of automobile's driving axle was introduced in chapter 1. Then the importance of making sure the taper roller bearings have a suitable pre-tightening force was carried out, and on the basis of this, the problem of adjustable gaskets selection between the two bearings was also put forward. At Last, the situation and development of the gasket selection both at home and abroad was introduced.Force of the taper roller bearings was analyzed in Chapter 2. The formula which describes the relationship between stiffness, deformation and force was obtained. Then the bearing's pre-tightening theory was discussed, and the pre-tightening method was introduced.Force of the driving taper assembly was analyzed in chapter 3. The Axial force's distribution in the riving taper assembly was discussed. Then adjusting the pre-tightening force of bearings through changing the thickness of the adjustable gaskets was proved to be true. At last, one kind of method which was testing the pre-tightening torque by testing the friction torque was put forward.According to the structure, the request of pre-tightening and the assembly process of the driving taper assembly, an assembly size chain was set up in chapter 4. This assembly size chain's closed-loop was the axial equivalent size which was transformed from the pre-tightening force. Then the method of grouping was given. On the basis of this, the measuring model was set up, the measuring method was studied and the gasket-selection machine was developed. This computer-controlled machine can intelligently measure the clearance along axes and select suitable gaskets.Factors which influenced the gasket-selection machine's testing precision was analyzed in chapter 5. On the basis of the measuring model, the main factors were analyzed, and error compensation and correcting were given out.In the end, the dissertation was summarized in the last chapter, and the possible research in future is presented.