Parameterized Model & Finite Element Analysis Of Helical Gear Of Automobile Transmission

The gear structure is widely used in all kinds of transmission machinesfor its high transmitting precision, compact structure, and its long life-span,the vehicle's mechanical gear-box depends on the gears' transmission tofinish the main movement. But it is a difficult and inefficient business todesign the gears' parameters with the traditional means, and it is difficult toget perfect parameters, go against advancing and impoldering the products'capability. By the computers' popularization and application, utilizing 3-Dsoftware to build the model and utilizing the modern finite element method toanalyze how the gears stress distribute, make the traditionalgear-stress-analyzing method changed, and makes it more precise. Afterapplying in the engineering, the combination of the two ways lead to asatisfied result, advances the engineering design and the analysis effectively,lighten the designers' work intension. The precise inclined gear 3-D model that is built in finite model is animportant premise to analyze the gear in finite element. The software of UGand ANSYS both has the ability to build the model and analyze the finiteelement , but they have different advantage, UG is good at building themodel, however, ANSYS is good at analyzing. So I utilizing the good dataI/O between UG and ANSYS, export the gear model which is built in UG toANSYS, then analyze with finite element. Thus both of the softwares' goodqualities are brought to play. In this article, I give an example, an inclined gear model is built in UG,according the data I/O of them I export the model to ANSYS to analyze theintensity of the gear. During building the model in UG, according to calculatetwo dots' coordinate invo on the tooth outline ofrandom radius, I draw the gear 3-D model with the method of programming.6.0 to secondary empolder the gear module, edit the user interface on theN MenuScript and UG/OPEN UIStyler, so weape by inputting different parameter.ompare their opening-up tools.t of computer, the finite element analysis islute equation which isAnd on the basis of strong secondary exploration function of UG, I use VC++flat of UG/OPEN API, UG/OPEcan change the gear shAccording the data I/O between UG and ANSYS, after I export the gearmodel from UG to ANSYS, aiming at the characteristic and the capability ofcomputer's calculation, I discuss how to carve up the gear's gridding andhow to carve up the teeth's joggling area and how to fix on the largest powerloading place, thus we can get a precise gear model. At last we can use theANSYS to get result.The idiographic work is about the next.1. I introduce the UG software briefly, its function's specialty and themain function module of UG CAD. Then I discuss about the technique of UGsecondary exploitation, including UG/OPEN GRIP language, UG/OpenAPIprogram UG/Open MenuScrip and UG/Open UIStyler. They are the basis ofrealizing the system. At last I deeply research the method of how to build thegear module in UG, and analyze and c2. I open up the column gear module secondary, get the result that thedialog box of the user interface and the gear's parameter, program thegear-parameterlization, and the program can get a precise incline gearmodel according the parameter.3. I analyze and compare some common methods of how to calculatethe root's stress of helical gear, including the plane hypothesis, thefold-section method, the boundary-element method, and the finite elementanalysis. By the developmenused widely for its convenience and shortcut.4. On the basis of having talked about the finite element and resolvingprocess, I utilize ANSYS to analyze a tooth of incline helical gear. To thegear unit's selection, the gridding carving-up, the worst load line, therestriction and the load's bringing-to-bear, I discuss and research, useANSYS's calculatation to process the data, at last I get the picture of stresscloud, and find the most dangerous point of the stress.5. Compared with traditional expresstions, the finite element analysis isfeasible.I also research the influence of the different fillet radius on bendstresss of helical gear. Educe a curve figure of this influence.It offers areference of the design of transmission's gear.The last part is a summary of this dissertation and prospect of thisresearch.