【正文】 s material properties is based upon experimental data. Several original experiments are proposed in order to extract the damping and friction characteristics of multiribbed belts. Finally, the applicability of the beltdrive model is presented by simulating a serpentine beltdrive,considering nonsteady beltdrive operational conditions,which are mon in automotive engines. to avoid the gear end of the runout and so on. ② Install bearings to avoid undue percussion, in the bearing transport, the assembly process to avoid the collision. ③ gear drive ponents required for the cleaning, the assembly process to avoid the bump on the transmission ponents. [4] 5 Conclusion Singlestage vehicle main gear axle noise problem is more plex systems, both with regard to the precision of the different ponents, but also need to be controlled separately in the assembly areas, the actual cause of the noise which may occur in one part of May also exist in numerous aspects of the problem is, as effectively prevent the occurrence of noise, you need the assembly in the manufacturing sector and all aspects of control and adjustment, especially adjustment of the need for strict control of postprocess method, based on actual feedback to constantly test The amendments adjust the volume, to ultimately a product of reasonable control. In this paper, the noise generated from the gear manufacturing precision and assembly precision analysis of two aspects. With the continuous improvement of manufacturing technology, advanced assembly process of the development and implementation, and strict implementation of relevant national and international standards, will be able to improve the quality of gear. REFERENCES [1] T. Vorm Mechanical design reducer, (1976) 241–250. [2] , and G. Barrow Study of noise reducer, (1969) 321–339. [3] . Philip Main gear for the vehicle drive axle problems of noise control, Int. J. Mach. Tool . 11 (1971) 133–144. [4] . Black, . James The noise problems of Gear , J. Eng. Ind. 103 (1981) 13–21. [5] . Yeo, . Lui and V. Phung, Gear reducer installed on the impact of noise, J. Mater. Process. Technol. 29 (1992) 41–46. 。 spline side gears and axle shaft with intermediate rotation noise. [2] 3 Factors and Countermeasures generated Final drive work with different types of noise may also occur which may occur only a certain category or categories, in order to effectively control the noise of all links in the need for effective process control, for possible Noise from the operation of link analysis and take an adjustable product realization solutions in order to later quickly after the product can be easily adjusted to control the noise. According to generate different types of noise, a mon production process control methods are: Adjust the spline flange intermediate and active relationship with the spline gear Because the pression flange is the role of small bearings, offset by the running gear in the axial force in the selected flange so the internal nature of the spline with the need to select the transition with little to ensure that the locking nut Effectively locked when the axial force transfer. Adjust the small gear bearing inner ring and the coordination To facilitate installation and maintenance is currently a small part of the final drive gear bearing inner ring and the nature of the cooperation with such a small space for easy installation and with oil seals for the main gear, but if the work in the main gear with the use of small space, when the initial Flange when the sudden passing of torque transfer to the driving gear, but small relative to the bearing inner ring measures will occur at this time moving, which measures the thickness of moving to block oil pan easily lead to increased wear and tear loose the small bearing axis, resulting in noise . If for small gap with the bearing inner ring gear rotation generated block oil pan gasket or sleeve or a large rotation of the dislocation occurs, it will lead to smaller due to axial force caused by axial impact, and this impact In the highspeed rotation will be issued under the large noise. [4] Preload adjustment gear If highspeed driving gear rotating bearing small bearings and large axial preload between the selected gear may result in inappropriate repetitive impact or size of the axial bearing premature wear, which is not conducive to noise control will reduce the product life Therefore, the regulation of gear preload is critical, because every set of gaskets and other parts of different materials and heat treatment method, it is difficult to determine the standard gear starting torque, adjust the starting torque by replacing gask