【摘要】：變速箱作為車輛的核心部分,其輸出特性對(duì)車輛的作業(yè)品質(zhì)有著直接的影響。液壓機(jī)械無級(jí)變速器具有傳動(dòng)比連續(xù)可調(diào)、動(dòng)力傳遞平穩(wěn)、操縱方便,燃油經(jīng)濟(jì)性高的優(yōu)點(diǎn)。目前,我區(qū)對(duì)自走式農(nóng)業(yè)機(jī)械液壓機(jī)械無級(jí)變速器的研究還很薄弱,開展對(duì)液壓機(jī)械無級(jí)變速器的研究,不但可為我區(qū)自走式農(nóng)業(yè)機(jī)械變速箱所面對(duì)的諸多技術(shù)難題提供新思路,還可為我區(qū)研究無級(jí)變速技術(shù)提供理論參考。本文是以設(shè)計(jì)開發(fā)一種新型液壓機(jī)械無級(jí)變速器為目標(biāo),主要研究?jī)?nèi)容如下:(1)基于對(duì)定軸齒輪副分流和匯流、行星齒輪副分流和匯流形式和特性的研究,確定了采用分矩匯速型作為液壓機(jī)械無級(jí)變速器分、匯流組合方案;建立了液壓機(jī)械無級(jí)變速多區(qū)段等差傳動(dòng)條件下、等比傳動(dòng)條件下、連續(xù)傳動(dòng)下的理論模型;設(shè)計(jì)開發(fā)了具有自主知識(shí)產(chǎn)權(quán)的采用“變量泵+定量馬達(dá)”和雙排行星齒輪副相組合的分矩匯速型等差多段式液壓機(jī)械無級(jí)變速傳動(dòng)方案;(2)基于對(duì)液壓機(jī)械無級(jí)變速器傳動(dòng)方案的優(yōu)化設(shè)計(jì),確定了液壓機(jī)械無級(jí)變速器的換段方式及各段的換段邏輯,并繪制了各區(qū)段液壓機(jī)械無級(jí)變速器動(dòng)力傳遞路線;針對(duì)所優(yōu)選的設(shè)計(jì)方案,建立了液壓機(jī)械無級(jí)變速器各區(qū)段輸出轉(zhuǎn)速的理論模型;結(jié)合變速箱的傳動(dòng)匹配設(shè)計(jì)以及整機(jī)田間作業(yè)特性,確定了液壓系統(tǒng)特性的參數(shù);在滿足液壓機(jī)械無級(jí)變速器的總傳動(dòng)比、各區(qū)段連續(xù)換段、各區(qū)段等差傳動(dòng)、液壓系統(tǒng)元件要求的前提下完成了液壓機(jī)械無級(jí)變速器的參數(shù)設(shè)計(jì);著重分析了各區(qū)段傳動(dòng)比隨排量比變化特性、行駛速度隨排量比變化特性、變速器扭矩特性、液壓功率分流比等特性;研究表明,該方案滿足了液壓機(jī)械無級(jí)變速器的連續(xù)無級(jí)變速要求;(3)針對(duì)行星齒輪副太陽輪、行星架和齒圈均處于回轉(zhuǎn)運(yùn)動(dòng)的工況,創(chuàng)新設(shè)計(jì)了兩種雙排行星齒輪副支撐機(jī)構(gòu)以加強(qiáng)雙排行星齒輪副運(yùn)轉(zhuǎn)的穩(wěn)定性;與支撐機(jī)構(gòu)相對(duì)應(yīng)設(shè)計(jì)了兩種雙排行星齒輪副結(jié)構(gòu)形式;分別設(shè)計(jì)了液壓機(jī)械無級(jí)變速軸、箱體、整機(jī)等結(jié)構(gòu);利用三維軟件建模軟件完成液壓機(jī)械無級(jí)變速器樣機(jī)三維建模,完成了液壓機(jī)械無級(jí)變速器的整套產(chǎn)品圖紙的繪制,最終完成液壓機(jī)械無級(jí)變速器實(shí)驗(yàn)樣機(jī)的加工制造;(4)提出了液壓機(jī)械無級(jí)變速器實(shí)驗(yàn)臺(tái)總體功能要求;完成液壓機(jī)械無級(jí)變速器實(shí)驗(yàn)臺(tái)整體結(jié)構(gòu)布局,并搭建了實(shí)驗(yàn)平臺(tái)機(jī)械部分結(jié)構(gòu);搭建了液壓機(jī)械無級(jí)變速器試驗(yàn)平臺(tái)離合器液壓系統(tǒng)、泵控馬達(dá)系統(tǒng)液壓油路;提出了試驗(yàn)平臺(tái)測(cè)控系統(tǒng)的數(shù)據(jù)采集與控制系統(tǒng)功能要求;初步搭建完成液壓機(jī)械無級(jí)變速器試驗(yàn)臺(tái),驗(yàn)證了液壓機(jī)械無級(jí)變速器的連續(xù)性。
[Abstract]:As the core part of the vehicle, the output characteristics of the gearbox have a direct impact on the working quality of the vehicle. Hydraulic mechanical stepless transmission has the advantages of continuously adjustable transmission ratio, stable power transmission, convenient operation and high fuel economy. At present, the research on the stepless transmission of self-propelled agricultural machinery hydraulic machinery in our region is still very weak, and the research on the stepless transmission of hydraulic machinery has been carried out. It can not only provide new ideas for many technical problems of self-propelled agricultural machinery gearbox, but also provide a theoretical reference for the study of stepless transmission technology in our region. The main contents of this paper are as follows: (1) based on the research of the distribution and confluence of the fixed axis gear pair, the form and characteristics of the planetary gear pair shunt and confluence. The combined scheme of dividing moment and confluence speed is determined as the continuous variable transmission of hydraulic machinery. The theoretical model of continuous transmission is established under the condition of constant speed and multi-section constant differential transmission of hydraulic machinery and the condition of equal ratio transmission. This paper designs and develops a variable pump quantitative motor with independent intellectual property rights and a multi-segment stepless transmission scheme of torque converging speed type and isodyne multi-segment hydraulic machinery using the combination of "variable pump quantitative motor" and double-row planetary gear pair. (2) based on the optimal design of the transmission scheme of the hydraulic machinery stepless transmission, the changing mode of the hydraulic machinery stepless transmission and the logic of each segment are determined, and the power transmission route of the hydraulic machinery stepless transmission is drawn. According to the selected design scheme, the theoretical model of output speed of every section of hydraulic mechanical stepless transmission is established, and the parameters of hydraulic system characteristic are determined according to the transmission matching design of gearbox and the field operation characteristics of the whole machine. The parameter design of hydraulic mechanical stepless transmission is completed on the premise of satisfying the total transmission ratio of hydraulic mechanical stepless transmission, continuous changing section of each section, equidifferential transmission of each section, and the requirement of hydraulic system components. The variation characteristics of transmission ratio with displacement ratio, speed with displacement ratio, transmission torque characteristic and hydraulic power shunt ratio are analyzed emphatically. The research shows that the scheme can meet the requirement of continuous stepless speed change of hydraulic machinery stepless transmission. (3) two kinds of double row planetary gear pair supporting mechanism are designed to enhance the stability of the double row planetary gear pair in view of the solar gear of the planetary gear pair, the planetary rack and the gear ring are in the condition of rotary motion; Two kinds of double row planetary gear pair structures are designed corresponding to the supporting mechanism, hydraulic machinery stepless variable shaft, box, whole machine and other structures are designed respectively. The 3D modeling software is used to complete the 3D modeling of the hydraulic machinery CVT prototype, and the drawing of the whole product drawing of the hydraulic machinery CVT is completed. Finally, the machining and manufacturing of the hydraulic machinery CVT experimental prototype is completed. (4) the overall functional requirements of the hydraulic mechanical stepless transmission experimental platform are put forward, the overall structure layout of the hydraulic machinery stepless transmission experimental platform is completed, and the mechanical part structure of the experimental platform is built. The hydraulic system of clutch and pump control motor system is built, and the functional requirements of data acquisition and control system of test platform are put forward. The hydraulic mechanical stepless transmission test bench was built to verify the continuity of the hydraulic mechanical stepless transmission.
【學(xué)位授予單位】：石河子大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U463.221

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本文編號(hào)：2311432