【摘要】：機(jī)械式脈動(dòng)無級(jí)變速器具有變速范圍寬、調(diào)速方式多、設(shè)計(jì)靈活度大、承載能力高和性能穩(wěn)定等特點(diǎn),在許多工業(yè)領(lǐng)域和加工生產(chǎn)線當(dāng)中有著廣泛的應(yīng)用。目前,脈動(dòng)式無級(jí)變速器大多是中低速、中小功率且存在一定速度波動(dòng)的機(jī)型。為了降低輸出轉(zhuǎn)速的脈動(dòng)度,一般是將三相以上的傳動(dòng)機(jī)構(gòu)組合在一起使用,但是將多相傳動(dòng)機(jī)構(gòu)組合起來使用不僅使變速器的結(jié)構(gòu)變得更加復(fù)雜,而且還會(huì)引入過多的重復(fù)約束,導(dǎo)致傳動(dòng)機(jī)構(gòu)對(duì)誤差非常敏感。因此,研制大功率、低脈動(dòng)、結(jié)構(gòu)緊湊和無重復(fù)約束的新機(jī)型是脈動(dòng)式無級(jí)變速器未來發(fā)展的重要方向,擁有廣闊的發(fā)展前景。本文正是針對(duì)脈動(dòng)式無級(jí)變速器的上述發(fā)展要求,在前人對(duì)非同軸雙輸出六桿函數(shù)發(fā)生機(jī)構(gòu)型綜合的基礎(chǔ)上,以運(yùn)動(dòng)分析作為主要研究手段,對(duì)主傳動(dòng)機(jī)構(gòu)進(jìn)行尺度綜合,并進(jìn)行了結(jié)構(gòu)化設(shè)計(jì),目前正在試制樣機(jī)。本文工作內(nèi)容如下:(1)分析了雙輸出六桿機(jī)構(gòu)的工作原理和傳動(dòng)特點(diǎn),建立了四相四桿單輸出機(jī)構(gòu)的Simulink仿真模型,以便于分析搖桿輸出角速度變化規(guī)律。并對(duì)兩相雙輸出六桿機(jī)構(gòu)的進(jìn)行了運(yùn)動(dòng)學(xué)仿真,分析表明,搖桿DG正行程和搖桿EF反行程的角速度曲線的變化規(guī)律相差較大,從而導(dǎo)致輸出轉(zhuǎn)速的脈動(dòng)度較大。在ADAMS中建立兩相六桿傳動(dòng)機(jī)構(gòu)的參數(shù)化模型,以減小脈動(dòng)度為目標(biāo),對(duì)設(shè)計(jì)變量進(jìn)行了優(yōu)化,進(jìn)而確定了各桿尺寸參數(shù)的最佳匹配值,提高了輸出轉(zhuǎn)速平穩(wěn)性。(2)分析了該六桿傳動(dòng)機(jī)構(gòu)中的存在過約束現(xiàn)象,運(yùn)用零過約束桿組法進(jìn)行了無過約束自調(diào)結(jié)構(gòu)設(shè)計(jì),得到了運(yùn)動(dòng)副的配置方案。利用矢量旋轉(zhuǎn)法,建立運(yùn)動(dòng)副B中自調(diào)位移計(jì)算模型,得到運(yùn)動(dòng)副B中自調(diào)位移變化規(guī)律,并在運(yùn)動(dòng)副軸線誤差的作用下,進(jìn)行了仿真分析,結(jié)果表明誤差對(duì)自調(diào)結(jié)構(gòu)輸出性能的影響幾乎可以忽略。(3)設(shè)計(jì)了用于非同軸雙輸出脈動(dòng)式無級(jí)變速器的斜面拉桿式曲柄調(diào)速裝置,完成了變速器主要零部件的設(shè)計(jì)和整機(jī)裝配模型的創(chuàng)建,并在ADAMS中進(jìn)行了運(yùn)動(dòng)學(xué)和負(fù)載作用下的動(dòng)力學(xué)仿真分析。(4)利用ANSYS Workbench對(duì)箱體、傳動(dòng)軸進(jìn)行了動(dòng)力學(xué)模態(tài)分析。對(duì)核心零件之一的連桿進(jìn)行了強(qiáng)度分析,并對(duì)連桿的結(jié)構(gòu)外形進(jìn)行了拓?fù)浣Y(jié)構(gòu)優(yōu)化。本文研究的非同軸雙輸出脈動(dòng)式無級(jí)變速器具有結(jié)構(gòu)簡單緊湊,變速性能穩(wěn)定等特點(diǎn)。經(jīng)自調(diào)結(jié)構(gòu)設(shè)計(jì)后,機(jī)構(gòu)對(duì)誤差具有較好的適應(yīng)能力,同時(shí)對(duì)制造精度的要求較低,具有良好的經(jīng)濟(jì)效益。
[Abstract]:The mechanical pulsating continuously variable transmission has the characteristics of wide variable speed range, multi-speed regulation mode, large design flexibility, high bearing capacity and stable performance, and has wide application in many industrial fields and processing production lines. At present, most of the pulse-type continuously variable transmission is of low and medium-speed, medium and small power, and there is a certain speed fluctuation model. in order to reduce the pulsation of the output rotation speed, it is generally used to combine three or more transmission mechanisms, but the combination of the multi-phase transmission mechanism makes it possible not only to make the structure of the transmission more complex, but also to introduce excessive repetition constraints, Causing the transmission mechanism to be very sensitive to the error. Therefore, the development of high-power, low-pulse, compact and non-repetitive-constrained new type is the important direction of the future development of the pulse-type continuously variable transmission, and has a wide development prospect. In this paper, based on the above-mentioned development requirement of the pulse-type continuously variable transmission, on the basis of the former combination of non-coaxial double-output six-bar functions, the motion analysis is used as the main research means, and the main transmission mechanism is subjected to scale synthesis, and the structured design is carried out. The prototype is currently being developed. The working contents of the paper are as follows: (1) The working principle and transmission characteristics of the double-output six-bar mechanism are analyzed, and the Simulink simulation model of the four-phase four-bar single-output mechanism is established, so as to analyze the change law of the output angular velocity of the rocker. The kinematics simulation of the two-phase double-output six-bar mechanism is carried out. The results show that the variation law of the angular velocity curve of the forward stroke of the rocker arm and the reverse stroke of the rocker arm is relatively large, resulting in a large fluctuation of the output speed. The parametric model of two-phase six-rod transmission mechanism was established in ADAMS to reduce the pulsation degree, and the design variable was optimized, and the best matching value of each rod size parameter was determined, and the stability of the output speed was improved. (2) The existence of the constraint phenomenon in the six-rod transmission mechanism is analyzed, and the self-adjusting structure design of the non-constrained self-adjusting is carried out by using the zero-crossing restraint rod group method, and the configuration scheme of the motion pair is obtained. By using the vector rotation method, the self-adjusting displacement calculation model in the motion pair B is established, and the variation law of the self-adjusting displacement in the motion pair B is obtained, and the simulation analysis is carried out under the action of the motion sub-axis error, and the result shows that the influence of the error on the output performance of the self-adjusting structure is almost negligible. (3) The design of the main parts of the transmission and the creation of the assembly model of the whole machine are completed, and the dynamic simulation analysis under the action of kinematics and load is carried out in ADAMS. (4) The dynamic modal analysis of the box and the transmission shaft was carried out by using the ANSYS Workbench. The strength analysis of the connecting rod of one of the core parts is carried out, and the structural shape of the connecting rod is optimized. The non-coaxial double-output pulse type continuously variable transmission studied in this paper has the characteristics of simple and compact structure, stable variable-speed performance and the like. After the self-adjusting structure design, the mechanism has better adaptability to the error, and meanwhile, the requirement on the manufacturing precision is low, and the mechanism has good economic benefit.
【學(xué)位授予單位】：重慶理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH132.46

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本文編號(hào)：2505174