本文選題：裝載機 + 雙泵輪液力變矩器�。� 參考：《吉林大學(xué)》2015年碩士論文

【摘要】：裝載機是工程建設(shè)中廣泛應(yīng)用的鏟土運輸機械之一。裝載機既有行駛工況又有鏟裝工況，發(fā)動機的輸出功率需要在傳動系統(tǒng)和液壓系統(tǒng)之間進(jìn)行動態(tài)合理分配才能滿足使用要求。為了適應(yīng)裝載機復(fù)雜多變的工況，，通常在發(fā)動機與變速箱之間都裝有液力變矩器，它與發(fā)動機之間的匹配決定了整機的動力性和燃油經(jīng)濟(jì)性。目前廣泛使用的裝載機液力變矩器的能容特性都是固定的。采用全功率匹配、部分功率匹配或折中優(yōu)化匹配法設(shè)計的液力變矩器與發(fā)動機匹配時，行駛工況和鏟裝工況下裝載機的匹配性能不能同時達(dá)到理想的效果。而雙泵輪液力變矩器具有能容特性可變的特點，可將其用于解決裝載機匹配問題。為了提升裝載機整機性能，本文基于某7t裝載機從雙泵輪液力變矩器設(shè)計、特性預(yù)測、匹配性能等方面對裝載機變能容匹配技術(shù)進(jìn)行了研究，主要內(nèi)容和結(jié)論如下。 （1）通過分析裝載機的工況，設(shè)計了帶有滑差離合器的雙泵輪液力變矩器以代替原裝三元件液力變矩器。采用相似法設(shè)計了雙泵輪液力變矩器的基準(zhǔn)型，其有效直徑為425mm。對基準(zhǔn)型的泵輪葉片進(jìn)行分割得到了雙泵輪液力變矩器主泵輪葉片和輔助泵輪葉片。設(shè)計了滑差離合器的結(jié)構(gòu)和液壓控制系統(tǒng)，分析了雙泵輪液力變矩器變能容控制方法。 （2）采用CFD數(shù)值仿真方法計算了不同滑差率和轉(zhuǎn)速比下雙泵輪液力變矩器各工作輪的轉(zhuǎn)矩，分析了雙泵輪狀態(tài)、單泵輪狀態(tài)、滑差狀態(tài)下雙泵輪液力變矩器的性能。通過建立滑差離合器受力平衡方程、計算雙泵輪液力變矩器側(cè)腔壓力，得到了滑差離合器的轉(zhuǎn)矩特性。結(jié)合雙泵輪液力變矩器的轉(zhuǎn)矩特性和滑差離合器的轉(zhuǎn)矩特性，求解出不同壓力控制規(guī)律下雙泵輪液力變矩器的原始特性，為裝載機變能容匹配特性分析奠定了基礎(chǔ)。 （3）建立了發(fā)動機和雙泵輪液力變矩器的數(shù)學(xué)模型，分析了換裝雙泵輪液力變矩器對共同工作輸入特性、輸出特性的影響。建立了發(fā)動機與雙泵輪液力變矩器動態(tài)變能容匹配仿真模型，對裝載機變能容匹配過程進(jìn)行了仿真，分析了一個作業(yè)循環(huán)內(nèi)換裝雙泵輪液力變矩器對匹配性能參數(shù)的影響。靜態(tài)和動態(tài)變能容匹配特性分析結(jié)果表明，與原機相比，換裝雙泵輪液力變矩器后，鏟裝工況下裝載機的匹配性能無明顯變化，行駛工況下裝載機的匹配性能得到了顯著改善。動力性和燃油經(jīng)濟(jì)性計算結(jié)果表明，與原機相比，換裝雙泵輪液力變矩器后整機的動力性和燃油經(jīng)濟(jì)性均得到了顯著提高。研究表明，雙泵輪液力變矩器與發(fā)動機之間的變能容匹配能夠同時滿足兩種典型工況下裝載機的使用要求，有效地提升裝載機整機性能。
[Abstract]:Loader is one of the widely used shoveling and transportation machinery in engineering construction. The loader has both driving and shoveling conditions. The output power of the engine needs to be distributed dynamically and reasonably between the transmission system and the hydraulic system in order to meet the operational requirements. In order to adapt to the complex and changeable working conditions of the loader, a hydraulic torque converter is usually installed between the engine and the gearbox. The matching between the engine and the engine determines the power performance and fuel economy of the whole engine. At present, the energy capacity characteristics of load loader torque converter are fixed. When the hydraulic torque converter designed by full power matching, partial power matching or eclectic optimization matching is matched with the engine, the matching performance of the loader under both driving and shovel conditions can not achieve the ideal effect simultaneously. The dual pump wheel torque converter has the characteristics of variable energy capacity and can be used to solve the load matching problem. In order to improve the performance of the loader, based on the design, characteristic prediction and matching performance of a 7t loader, the variable energy capacity matching technology of the loader is studied in this paper. The main contents and conclusions are as follows. 1) by analyzing the working conditions of the loader, a hydraulic torque converter with two pump wheels with slip clutch is designed to replace the original three-component hydraulic torque converter. The reference type of double pump wheel hydraulic torque converter is designed by using similarity method. Its effective diameter is 425 mm. The vane of the main pump wheel and the auxiliary pump wheel of the double pump wheel hydraulic torque converter are obtained by dividing the reference type pump wheel vane. The structure and hydraulic control system of slip clutch are designed, and the energy capacity control method of hydraulic torque converter with double pump wheel is analyzed. CFD numerical simulation method is used to calculate the torque of each working wheel of double pump hydraulic torque converter under different slip rate and speed ratio. The performance of double pump wheel hydraulic torque converter is analyzed under the condition of double pump wheel state, single pump wheel state and slip state. By establishing the force balance equation of slip clutch, the side cavity pressure of hydraulic torque converter with double pump wheel is calculated, and the torque characteristic of slip clutch is obtained. Combined with the torque characteristics of hydraulic torque converter with double pump wheels and the torque characteristics of slip clutch, the original characteristics of hydraulic torque converter with double pump wheels under different pressure control laws are solved, which lays a foundation for the analysis of load loader variable energy capacity matching characteristics. The mathematical model of hydraulic torque converter for engine and double pump wheel is established, and the influence of replacing double pump wheel hydraulic torque converter on the input and output characteristics of the joint operation is analyzed. The simulation model of dynamic energy capacity matching between engine and double pump wheel hydraulic torque converter is established. The process of energy change matching of loader is simulated, and the effect of changing hydraulic torque converter with double pump wheel on matching performance parameters is analyzed. The analysis results of static and dynamic variable energy capacity matching characteristics show that the matching performance of loaders under shovel loading condition has no obvious change, and the matching performance of loaders under driving conditions has been significantly improved compared with that of the original one. After the replacement of hydraulic torque converter with double pump wheels, the matching performance of loaders under shovel loading condition has no obvious change. The results of power performance and fuel economy calculation show that the power performance and fuel economy of the whole machine after the replacement of double pump wheel hydraulic torque converter have been significantly improved compared with the original engine. The research shows that the variable energy capacity matching between the hydraulic torque converter and the engine can meet the requirements of the loader under two typical working conditions and effectively improve the performance of the loader.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TH137.332;TH243

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 魏宸官;可控變能容雙泵輪(氵N

本文編號：1986913