The Cause Of The Light Truck Rear Axle Squeak And Improvement Analysis

With the domestic living standards improve, people live car penetration rate isincreased every year with the car into the general population family. Car to bring theenjoyment of the people’s material life, and also to make people suffer serious noisepollution. The abnormal noise emitted when the car is traveling not only feel the lifeof the vehicle itself and the occupants have a greater impact, but also endangerEnvironmental Protection. Vehicle noise radiation impact not only on the health ofoccupants, and also directly harm people in the external environment. AutomotiveNVH issues has become one of the major vehicle manufacturers and parts companiesin the international automotive industry concern. Thus the major automobilemanufacturers in each of the larger part of the R&D funding is used in solving thevehicle NVH issues. The Jiangling Isuzu Motors Limited as the well-known carmanufacturer is also faced with a variety of vehicle NVH issues. With theimplementation of the country, three emission standards of the National Automobile,the Jiangling Isuzu Motors Limited took the lead in the domestic market the emissionsof the country, three standards JMC series light trucks, light trucks of this type ofperformance, noise, fuel-saving features in the Guangdong market reaction good theaftermarket customer complaints after listing the vehicle on the rear axle noise is toolarge, the quality department attaches great importance to the joint design, sales, andrear axle suppliers formed the special rectification team rectification.Rear axle is commonly used light truck drive axle drive axle, is one of the mostimportant parts of the model vehicle chassis, vehicle drive axle noise noise inside andoutside the vehicle need to be taken seriously, it is limited to light trucksimportantfactors in automobile quality, vibration and noise of the rear axle in the course of thecampaign a greater impact on the overall quality of the vehicle. Learn drive axle noisecharacteristics and noise are larger theoretical significance and practical role todevelop a reasonable noise suppression and effective control of the car inside andoutside. The papers from the company the actual occurrence of the aftermarket qualityissues, research and analysis of the drive axle abnormal noise most noticeable with theband range, combined with noise suppression theory, according to the company’sactual manufacturing process level, to develop the most effective, lowest cost and production switched most convenient noise suppression program, in order to enhancethe quality of the dynamic noise of the drive axle.The main content of the thesis is as follows:1、Analysis of an occurrence mechanism of the drive axle abnormal soundanalysis, combined with the structure and function of a light truck driver bridge fromthe gear body vibration, the meshing impact with noise, dynamic coupling vibrationdriver bridge vibration and the relationship of the housing the mechanism of abnormalnoise, drive axle and a brief introduction of noise measurement and analysistechniques, and the noise of the conventional control method, provides theoreticalsupport for the later chapters-depth analysis of the drive axle abnormal soundimprovement measures.2、drive axle abnormal sound improvements, combined with the actual conditionof the company, to determine the pilot research programs and plans. CAE analysisexcluded the main reduction gear design stiffness, strength, impact noise testabnormal sound produced the most significant band range from truck driver find thedrive axle noise; final analysis test and resolve two means results and noise controltheory, develop appropriate noise control measures.3、disincentives verify abnormal noise test results according to the drive axle,respectively, from the two aspects to solve the noise source and the actual level ofprocessing technology, cost management to proceed to develop the three control noisemeasures, vehicle road test cases indicate, low cost of control measures, the effect isobvious, the implementation of convenient, fast, and other advantages.In addition to this paper not only seek to solve a light truck drive axle abnormalnoise and effective control program, also summed up the general method of controlthe drive axle abnormal noise, for the study of other similar models to drive the bridgeabnormal sound fundamental reason to develop suppression program, basic data anddesign principles.