The Research On Gear Strength Improvement Based On Finite Element Method

DCGROUP company with a12transmission is the introduction of the NissanDiesel Gearbox, Our company digestion of the product technology, absorb, grasp,independent research and development on this basis,12-gear transmission. Thegear box in the2006production. sales in the domestic market. The gearbox hasthe following characteristics:1、China’s first use of die-casting aluminum shell gearbox, gearbox assemblyand light weight, the weight is only292Kg, with the cast iron shell of thegearbox assembly are compared, weight100Kg;2、Vice boxes former vice-box+box+synchronizer multi-gear transmissionassembly；3、Gearbox switch Deputy box electronically controlled by the TCU controlsolenoid valve Deputy box shifting operation, with the gear identificationfunction, so that reliability；4、The gearbox is equipped with oil filters, filter the impurities of thegearbox lubricant to ensure the cleaning of the gearbox lube oil cooler canbe installed for different use of the environment, reduce transmission oiltemperature and extend the transmission internal gearsynchronizer and bearinglife；Since entering the market, the gearbox, the first in the domestic tractormarket. Because of its light weight, simple manipulation, one hundredkilometers of5-10oil than the same type of gearbox, ideal for road car use,to meet the use of high-speed transportation of domestic and internationalmarkets, the market has been the praise of users.In the match of the truck on the market after Deputy box low gear to fighttooth failure. In order to further expand markets, increase market share, sothat it can adapt to the requirements of the project car. Restrictions due tothe improvement, not the shape and connection of the transmission the biggersize of the change, the maximum guarantee the original state of partscommonality, and low gear after Deputy box fine design.In this paper, the strength of the effect of sub-box gear related factors:1) sub-tank shell deformation;2) the output shaft of the force deformation;3) gear meshing state under overload. Shell irregular shape, the conventionalmethod of calculation can not accurately calculate the deformation of gearcontact stress analysis, to determine the transmission low gear modificationamount is the focus of the study. At present, the contact analysis capabilitiesof ANSYS software in a variety of numerical analysis software to analyze themore powerful. In the analysis, model, model simplification, the choice of themodel parameters were studied, focusing on exploring the stress state underactual working conditions when the gear meshing analysis. Large general-purpose finite element analysis software ANSYS software, apowerful modeling capabilities, and ANSYS also provides the interface functionwith other software, other software, the three-dimensional model can be inputinto ANSYS, the shell has been adopted in this article Pro/E software modeling,analysis of the shell with Pro/e software for analysis. Three-dimensionalsolid model of the gear, provides a way to accurately model parts model in ANSYS.For finite element analysis, mesh division of the most important. ANSYSsoftware provides the corresponding meshing capabilities. If the direct useof the freedom of meshing capabilities of the software system, tooth and roundbody carved out of the unit will have a larger error will affect the calculationaccuracy. In the three-dimensional solid model of the gear meshing, the contactarea of the tooth, a key division, divided into a number of mutual bonding ofsmall entities, and ultimately the formation of the finite element model ofthe gear.After sub-tank shell deformation of the gear contact stress greater impact,this paper analyzes the shell deformation stress of the gear meshing, meshingdifferent helix angle, combined with theoretical calculations and bench test,the final confirmation gear modification parameters [1].