本文選題：多齒輪變量齒輪泵 + 優(yōu)化設(shè)計(jì)�。� 參考：《安徽理工大學(xué)》2012年碩士論文

【摘要】：齒輪泵作為齒輪在工業(yè)應(yīng)用中的典型代表液壓元件,其具有結(jié)構(gòu)簡(jiǎn)單且緊湊,體積小、質(zhì)量輕,污染敏感性小,方便維修,價(jià)格低廉等特點(diǎn),決定了其在液壓傳動(dòng)系統(tǒng)中占據(jù)舉足輕重的重要地位。但是由于普通齒輪泵存在徑向力不平衡、流量的脈動(dòng)大等各種缺陷,其中不能變排量又大大的限制了使用范圍。本課題綜合普通齒輪泵的結(jié)構(gòu)特點(diǎn),設(shè)計(jì)出一種變排量的多齒輪外嚙合齒輪泵,降低了種種缺陷的危害。 本文首先通過(guò)普通外嚙合齒輪泵與多齒輪變量齒輪泵工作原理和流量特性的分析對(duì)比,并以齒輪泵體積最小和流量脈動(dòng)系數(shù)最小為雙目標(biāo),尋求建立多齒輪變量齒輪泵結(jié)構(gòu)的優(yōu)化數(shù)學(xué)模型,利用優(yōu)化設(shè)計(jì)軟件分析得出最優(yōu)解。 接著針對(duì)齒輪泵存在的徑向液壓力、困油等現(xiàn)象分析計(jì)算,可知該變量泵主動(dòng)輪的徑向液壓力基本完全平衡；相同排量下,該泵齒頂圓直徑比普通齒輪泵大約減少1/3,從動(dòng)輪徑向力也減小1/3,泵體體積減小,受力情況有效改善,不但延長(zhǎng)齒輪的工作壽命,而且為解決齒輪泵高壓化提供有力措施。同時(shí)對(duì)主要零件、變量機(jī)構(gòu)進(jìn)行選材設(shè)計(jì),分析可知軸向變量機(jī)構(gòu)的最小嚙合寬度bmin≥B/3,則最大排量大約是最小排量的三倍。 而后運(yùn)用有限元分析軟件對(duì)多齒輪變量齒輪泵的中心輪、從動(dòng)輪進(jìn)行靜態(tài)分析,得出給定載荷下的應(yīng)力、位移與安全系數(shù)等分布云圖,觀察分析結(jié)果,預(yù)測(cè)評(píng)估其是否滿足工作要求,提高結(jié)構(gòu)設(shè)計(jì)的可靠性。 其次分別分析了普通外嚙合齒輪泵與多齒輪變量齒輪泵的幾何流量、瞬時(shí)流量及瞬時(shí)流量特性,通過(guò)理論分析得出多齒輪泵的瞬時(shí)流量變大,而且降低了流量脈動(dòng),流量品質(zhì)獲得很大改善。經(jīng)過(guò)仿真驗(yàn)證結(jié)論的真實(shí)性。 為進(jìn)一步探討多齒輪變量齒輪泵的齒輪傳動(dòng),運(yùn)用虛擬樣機(jī)仿真技術(shù)進(jìn)行運(yùn)動(dòng)學(xué)仿真和齒輪碰撞接觸力的動(dòng)力學(xué)仿真。利用三維軟件初步建立結(jié)構(gòu)簡(jiǎn)化模型,仿真分析得出角速度與接觸力的結(jié)果圖解,并觀察記錄。同時(shí)對(duì)普通外嚙合齒輪泵進(jìn)行虛擬運(yùn)動(dòng)仿真,通過(guò)對(duì)比分析我們發(fā)現(xiàn),變量泵的角速度脈動(dòng)降低,接觸力波動(dòng)變小,峰值下降,流量脈動(dòng)也降低,明顯減小了沖擊、振動(dòng)等對(duì)液壓系統(tǒng)的損毀,驗(yàn)證了此結(jié)構(gòu)的可行性,而且縮短了產(chǎn)品結(jié)構(gòu)設(shè)計(jì)周期,提高了工作效率。 為準(zhǔn)確捕捉變量泵的內(nèi)部流場(chǎng)泄漏的變化情況,針對(duì)此齒輪泵的三維簡(jiǎn)化模型進(jìn)行流場(chǎng)仿真,做有限元分析和計(jì)算。重點(diǎn)對(duì)主要泄漏即端面間隙和徑向間隙的泄漏仿真,仿真分析出當(dāng)壓差Δp=2Mpa時(shí),不同端面間隙、徑向間隙與泄漏流量的關(guān)系,為深入研究齒輪泵的內(nèi)部流場(chǎng)奠定了堅(jiān)實(shí)的基礎(chǔ)。 圖[80]表[13]參[76]
[Abstract]:As a typical hydraulic component of gear in industrial application, gear pump has the characteristics of simple and compact structure, small volume, light weight, low sensitivity to pollution, convenient maintenance, low price, etc. It plays an important role in hydraulic transmission system. But there are many defects such as radial force imbalance, large pulsation of flow rate and so on, which can not change the displacement and greatly limit the range of application. Based on the structural characteristics of common gear pump, a multi-gear external meshing gear pump with variable displacement is designed in this paper, which reduces the harm of various defects. In this paper, the working principle and flow characteristics of common external gear pump and multi-gear variable gear pump are analyzed and compared at first, and the minimum volume and flow pulsation coefficient of gear pump are taken as the two targets. The optimal mathematical model of multi-gear variable gear pump is established, and the optimal solution is obtained by the analysis of optimization design software. Then, according to the analysis and calculation of the radial hydraulic pressure and oil trapping of gear pump, it is known that the radial hydraulic force of the active wheel of the variable pump is basically completely balanced; under the same displacement, The diameter of the tooth top circle of the pump is about one third less than that of the common gear pump, the radial force of the driving wheel is also reduced by 1 / 3, the volume of the pump body is reduced, and the force condition is effectively improved, which not only prolongs the working life of the gear, but also provides a powerful measure for solving the high pressure of the gear pump. At the same time, the material selection of main parts and variable mechanism is carried out, and the analysis shows that the minimum meshing width of axial variable mechanism bmin 鈮，

本文編號(hào)：1886225