本文選題：弧齒齒輪泵　切入點：困油　出處：《揚州大學(xué)》2011年碩士論文　論文類型：學(xué)位論文

【摘要】：齒輪泵具有結(jié)構(gòu)簡單、使用可靠、壽命長、價格低的優(yōu)點,廣泛應(yīng)用于機床、汽車、船舶、飛機等機械產(chǎn)品的液壓系統(tǒng)中。本文提出的弧齒齒輪泵是一種新型齒輪泵,主要由一對幾何參數(shù)相同的漸開線弧齒圓柱齒輪、傳動軸、泵體、端蓋構(gòu)成。由于弧齒圓柱齒輪傳動具有嚙合性能好、重疊系數(shù)大、噪聲低、承載能力強、無軸向分力、使用壽命長等優(yōu)點,用其構(gòu)建齒輪泵具有明顯的優(yōu)勢。 本文分析了弧齒圓柱齒輪副的嚙合特性,確定了其幾何參數(shù)以及正確嚙合條件,并且推導(dǎo)了嚙合齒廓方程、嚙合線方程、齒面方程以及重合度計算公式。根據(jù)分析可知一對弧齒圓柱齒輪齒面能夠?qū)崿F(xiàn)線接觸,實現(xiàn)封油,因此弧齒圓柱齒輪可以用于構(gòu)建齒輪泵,并且保證泵的正常運轉(zhuǎn)。 本文分析了弧齒齒輪泵的困油特性,推導(dǎo)了其平穩(wěn)運行的條件,探討了不發(fā)生困油現(xiàn)象時弧齒圓柱齒輪副的幾何參數(shù)之間的關(guān)系,即：通過合理設(shè)置齒輪的幾何參數(shù),弧齒齒輪泵可以平穩(wěn)傳動且不發(fā)生困油現(xiàn)象。通過對直齒齒輪泵、弧齒齒輪泵瞬時流量及流量脈動計算分析得到：在主要幾何參數(shù)相同的情況下,弧齒齒輪泵的流量脈動小于直齒齒輪泵的流量脈動。 最后,本文介紹了計算流體動力學(xué)中的相關(guān)數(shù)學(xué)模型以及泵內(nèi)流場的離散格式和數(shù)值計算方法。使用三維造型系統(tǒng)對弧齒齒輪泵進行三維造型,用網(wǎng)格劃分軟件Gambit進行實體處理與網(wǎng)格劃分,應(yīng)用流場分析軟件Fluent對泵內(nèi)流場進行數(shù)值模擬分析,得到其流場壓力云圖、速度矢量圖和瞬時體積流量變化圖,并據(jù)此分析了流場的流態(tài),所得到的流場內(nèi)的壓力、速度分布與理論分析基本一致�；↓X齒輪泵的動態(tài)特性模擬分析結(jié)果與直齒齒輪泵的數(shù)值模擬分析結(jié)果對比表明,弧齒齒輪泵的瞬時流量脈動特性優(yōu)于直齒齒輪泵。
[Abstract]:Gear pump has the advantages of simple structure, reliable use, long service life and low price. It is widely used in hydraulic system of machine tool, automobile, ship, aircraft and so on. It is mainly composed of a pair of involute arc tooth cylindrical gears with the same geometric parameters, transmission shaft, pump body and end cover. Because the arc tooth cylindrical gear transmission has good meshing performance, large overlap coefficient, low noise, strong bearing capacity and no axial component force, With the advantages of long service life, the construction of gear pump has obvious advantages. In this paper, the meshing characteristics of the cylindrical gear pair with arc teeth are analyzed, the geometric parameters and the correct meshing conditions are determined, and the meshing tooth profile equation and the meshing line equation are derived. According to the analysis, it can be known that a pair of arc cylindrical gears can achieve linear contact and seal oil, so the arc tooth cylindrical gear can be used to construct gear pump and ensure the normal operation of the pump. In this paper, the oil trap characteristic of arc tooth gear pump is analyzed, the condition of its smooth operation is deduced, and the relationship between geometric parameters of arc tooth cylindrical gear pair without oil trap is discussed, that is, by setting the geometric parameter of gear reasonably, The arc gear pump can drive smoothly and does not get stuck in oil. By calculating and analyzing the instantaneous flow rate and flow pulsation of the straight tooth gear pump and the arc tooth gear pump, it is concluded that the main geometric parameters are the same. The flow pulsation of arc gear pump is smaller than that of straight gear pump. Finally, this paper introduces the relevant mathematical models in computational fluid dynamics, the discrete format and numerical calculation method of the flow field in the pump. The three-dimensional modeling system is used to model the arc gear pump. The solid processing and mesh division are carried out with Gambit, and the flow field inside the pump is simulated and analyzed by using the flow field analysis software Fluent. The flow field pressure cloud diagram, velocity vector diagram and instantaneous volume-flow change diagram are obtained, and the flow field pressure cloud diagram, velocity vector diagram and instantaneous volume flow change diagram are obtained by using the flow field analysis software Fluent. According to the analysis of the flow field, the pressure and velocity distribution in the flow field are basically consistent with the theoretical analysis. The results of dynamic simulation analysis of arc gear pump and numerical simulation analysis of straight tooth gear pump show that the pressure and velocity distribution in the flow field are basically consistent with the theoretical analysis, and the results show that the dynamic characteristics of the arc gear pump are compared with those of the straight gear pump. The instantaneous flow pulsation characteristic of arc gear pump is better than that of straight gear pump.
【學(xué)位授予單位】：揚州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH325

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