【摘要】：目前,行星齒輪傳動在工程機械領(lǐng)域應用廣泛,與其他齒輪傳動相比,其具有體積小、重量輕、結(jié)構(gòu)緊湊、傳遞效率高等優(yōu)點。但在行星變速箱設計過程中,各構(gòu)件轉(zhuǎn)速、轉(zhuǎn)矩變化特征,各擋位傳遞效率大小,各擋位功率流向以及是否存在封閉功率等問題仍值得重點研究。此外,輪齒嚙合力變化特征、輪齒應力分布以及輪齒關(guān)鍵節(jié)點應力動態(tài)特性等也需重點關(guān)注。 本文的行星變速箱研究得到了國家自然科學基金項目“輪式工程車輛傳動系載荷譜關(guān)鍵技術(shù)研究”(項目編號：50805065)的資助,以某型號裝載機行星變速箱為研究對象,對變速箱傳動比、轉(zhuǎn)速、轉(zhuǎn)矩以及傳遞效率進行理論分析；建立傳動系統(tǒng)仿真模型,利用ADAMS和Simulink軟件建立變速箱聯(lián)合仿真模型,分析不同擋位下變速箱的工作性能；對變速箱中關(guān)鍵齒輪進行柔性化,利用Hypermesh及RecurDyn軟件建立變速箱剛?cè)峄旌夏Ｐ?分析輪齒嚙合力變化特征、輪齒應力分布以及輪齒關(guān)鍵節(jié)點動態(tài)特性。 論文主要工作和內(nèi)容如下： (1)通過查閱和分析大量文獻資料,綜述了行星變速箱國內(nèi)外研究概況及選題背景和意義；并對目前存在的問題,提出本文研究的基本方法和主要內(nèi)容。 (2)本文以某型號裝載機行星式動力換擋變速箱為研究對象,闡述了該變速箱的工作原理,理論分析了行星變速箱各擋位下各構(gòu)件的轉(zhuǎn)速、轉(zhuǎn)矩以及變速箱傳遞效率。 (3)本文分別建立了發(fā)動機和液力變矩器仿真模型,變速箱虛擬樣機模型,驅(qū)動橋、整車仿真模型等。并對以行星變速箱虛擬樣機模型為核心,以傳動系統(tǒng)仿真模型為控制輸入、變速箱各工況性能為輸出的系統(tǒng)進行聯(lián)合仿真分析,為變速箱的理論系統(tǒng)研究提供基礎。 (4)針對行星變速箱各種不同工況條件下的工作特性進行仿真分析。主要分析了同一擋位下各行星排轉(zhuǎn)速轉(zhuǎn)矩變化特征、傳遞效率以及變速箱總傳遞效率；不同擋位下各排各構(gòu)件轉(zhuǎn)速轉(zhuǎn)矩變化特征,離合器和制動器轉(zhuǎn)矩變化特征,傳遞效率以及功率流向；分析對比同一擋位下各行星排傳遞效率以及功率流向；分析對比不同擋位下傳遞效率以及功率流向。結(jié)果表明,同一擋位時,第V排傳遞效率最低,其余各排傳遞效率均高于97%,前進擋比后退擋傳遞效率高,不同擋位時,前進Ⅱ擋傳遞效率最高,前進Ⅰ擋和Ⅳ擋傳遞效率最低。 (5)利用Hypermesh及RecurDyn軟件建立變速箱剛?cè)峄旌夏Ｐ?分別在空載Ⅰ擋起步、滿載Ⅰ擋起步及空載Ⅱ擋起步三種工況下,對各行星排輪齒嚙合力變化特征、輪齒應力分布以及輪齒關(guān)鍵節(jié)點應力動態(tài)特性進行分析。結(jié)果表明,輪齒齒頂附近節(jié)點應力比節(jié)圓、齒根附近節(jié)點要大,齒頂兩側(cè)比中間應力相對要大。
[Abstract]:At present, planet gear transmission is widely used in the field of construction machinery. Compared with other gear drives, planet gear transmission has the advantages of small volume, light weight, compact structure, high transmission efficiency and so on. However, in the process of planet gearbox design, the speed and torque variation characteristics of each component, the transmission efficiency of each block, the power flow direction of each block and the existence of closed power are still worthy of focus study. In addition, the variation characteristics of gear tooth meshing force, the stress distribution of gear teeth and the stress dynamic characteristics of key nodes of gear teeth also need to be paid attention to. The research of planet gearbox in this paper is supported by the National Natural Science Foundation of China (National Natural Science Foundation of China) "Research on the key Technology of load Spectrum of Wheel Engineering vehicle Transmission system" (project number: 50805065). The transmission ratio, speed, torque and transmission efficiency of a certain type of loader are analyzed theoretically. The transmission system simulation model is established, and the joint gearbox simulation model is established by using ADAMS and Simulink software to analyze the working performance of the gearbox under different gears. The key gears in the gearbox are flexible, and the rigid-flexible mixed model of the gearbox is established by using Hypermesh and RecurDyn software. The variation characteristics of gear tooth meshing force, the stress distribution of gear teeth and the dynamic characteristics of key nodes of gear teeth are analyzed. The main work and contents of this paper are as follows: (1) by consulting and analyzing a large number of literature, this paper summarizes the research situation, background and significance of the topic at home and abroad, and puts forward the basic methods and main contents of this paper for the existing problems. (2) taking the star power shift gearbox of a certain type of loader as the research object, this paper expounds the working principle of the gearbox, and theoretically analyzes the rotational speed, torque and transmission efficiency of each component of the planet gearbox under each gear position. (3) in this paper, the engine and hydraulic torque converter simulation model, gearbox virtual prototype model, drive axle, vehicle simulation model and so on are established. The joint simulation analysis of the system with the virtual prototype model of the planet gearbox as the core, the simulation model of the transmission system as the control input and the performance of the gearbox as the output is carried out, which provides the basis for the theoretical system research of the gearbox. (4) the working characteristics of the planet gearbox under different working conditions are simulated and analyzed. This paper mainly analyzes the torque variation characteristics, transmission efficiency and total transmission efficiency of each row under the same gear position; the speed torque variation characteristics, clutch and brake torque variation characteristics, transmission efficiency and power flow direction of each row under different gears; analyzes and compares the transmission efficiency and power flow direction of each planet row under the same gear position; and analyzes and compares the transmission efficiency and power flow direction under different gears. The results show that the transmission efficiency of the V row is the lowest, the transmission efficiency of the other rows is higher than 97%, the transmission efficiency of the forward gear is higher than that of the backward gear, and the transmission efficiency of the forward second gear is the highest, and that of the forward first gear and the fourth gear is the lowest when the forward gear is in the same position. (5) the rigid-flexible mixed model of gearbox is established by using Hypermesh and RecurDyn software. The variation characteristics of gear meshing force, stress distribution of gear teeth and stress dynamic characteristics of key nodes of gear teeth are analyzed under three working conditions: no-load first gear, full-load first gear and no-load second gear respectively. The results show that the stress of the node near the tooth top of the gear tooth is larger than that of the pitch circle, the node near the tooth root is larger, and the stress on both sides of the tooth top is relatively larger than that of the middle stress.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH132.46

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