本文關(guān)鍵詞：一種可變連桿式VCR發(fā)動(dòng)機(jī)結(jié)構(gòu)設(shè)計(jì)與主要零部件動(dòng)力學(xué)分析　出處：《重慶交通大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

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【摘要】：日益嚴(yán)重的能源形勢(shì)和越來(lái)越嚴(yán)格的排放規(guī)定,讓大功率、高性能、低功耗、低污染、多元化、新結(jié)構(gòu)成為當(dāng)今發(fā)動(dòng)機(jī)的特性。然而,既具有良好的動(dòng)力性能又具有良好的排放性能和燃油經(jīng)濟(jì)性在一般發(fā)動(dòng)機(jī)中無(wú)法同時(shí)滿(mǎn)足,并且發(fā)動(dòng)機(jī)在怠速時(shí)、部分負(fù)荷時(shí)以及啟動(dòng)時(shí)因無(wú)法完全燃燒導(dǎo)致整體性能差的問(wèn)題始終得不到很好的解決。因此,研發(fā)低功耗、高功率的發(fā)動(dòng)機(jī)成為目前市場(chǎng)熱點(diǎn)。本文以F1C系列某款發(fā)動(dòng)機(jī)為原型,根據(jù)導(dǎo)師團(tuán)隊(duì)申請(qǐng)的發(fā)明專(zhuān)利《可變連桿式VCR發(fā)動(dòng)機(jī)連桿機(jī)構(gòu)》的設(shè)計(jì)思想,對(duì)一種可變連桿式VCR(Variable Compression Ratio)發(fā)動(dòng)機(jī)機(jī)構(gòu)的結(jié)構(gòu)和動(dòng)力性能進(jìn)行了研究。在本次研究中提出了一種可變壓縮比機(jī)構(gòu)的設(shè)計(jì)方案,對(duì)其主要零部件的結(jié)構(gòu)進(jìn)行了計(jì)算設(shè)計(jì)和可靠性驗(yàn)算,并進(jìn)行了三維建模,最后采用靜力學(xué)分析和動(dòng)力學(xué)分析,驗(yàn)證了該VCR機(jī)構(gòu)的可行性。本文的主要研究?jī)?nèi)容如下:①根據(jù)課題組申請(qǐng)的國(guó)家發(fā)明專(zhuān)利《可變連桿式VCR發(fā)動(dòng)機(jī)連桿機(jī)構(gòu)》的設(shè)計(jì)思想和F1C系列某款發(fā)動(dòng)機(jī)的結(jié)構(gòu)參數(shù),提出了一種可變連桿長(zhǎng)度的VCR發(fā)動(dòng)機(jī)。本文主要以該VCR發(fā)動(dòng)機(jī)的曲柄連桿機(jī)構(gòu)為研究對(duì)象,實(shí)現(xiàn)了一種可根據(jù)改變連桿長(zhǎng)度來(lái)實(shí)現(xiàn)壓縮比變化的設(shè)計(jì)方案。以液壓缸和連桿的運(yùn)動(dòng)規(guī)律,對(duì)壓縮比和可變連桿長(zhǎng)度之間的變化關(guān)系進(jìn)行了分析與計(jì)算。②從理論上分析了該發(fā)動(dòng)機(jī)中曲柄連桿機(jī)構(gòu)的工作原理和受力情況,確定了主要零部件的結(jié)構(gòu)尺寸,并進(jìn)行了強(qiáng)度校核;利用CATIA V5三維設(shè)計(jì)軟件平臺(tái),對(duì)曲柄連桿機(jī)構(gòu)進(jìn)行了模型的建立,為仿真研究提供了模型。③利用Ansys Workbench有限元分析軟件對(duì)可變連桿機(jī)構(gòu)進(jìn)行了靜力學(xué)仿真研究,考察了在可變連桿中連桿、活塞桿和液壓缸分別受到最大外力時(shí)的應(yīng)力應(yīng)變變化,驗(yàn)證了該VCR機(jī)構(gòu)方案的合理性和結(jié)構(gòu)的可靠性;④基于ADAMS動(dòng)力學(xué)分析軟件,對(duì)該VCR發(fā)動(dòng)機(jī)機(jī)構(gòu)進(jìn)行了運(yùn)動(dòng)學(xué)和動(dòng)力學(xué)仿真,考察了該機(jī)構(gòu)在發(fā)動(dòng)機(jī)不同轉(zhuǎn)速和不同負(fù)荷下對(duì)發(fā)動(dòng)機(jī)性能的影響,進(jìn)一步驗(yàn)證了該VCR機(jī)構(gòu)方案的可行性。研究表明:所提出的可變連桿式VCR機(jī)構(gòu)的方案合理可行,結(jié)構(gòu)穩(wěn)定可靠,主要零部件的設(shè)計(jì)滿(mǎn)足強(qiáng)度要求,并能實(shí)現(xiàn)改善發(fā)動(dòng)機(jī)功率和排放的性能。
[Abstract]:The increasingly serious energy situation and the increasingly stringent emission regulations for high power, high performance, low power consumption, low pollution, diversification, the new structure has become the characteristic of modern engine. However, not only has good dynamic performance and excellent emission performance and fuel economy in general can not satisfy the engine and the engine. In the idle, part load and startup due to incomplete combustion leads to poor performance of the problem has not been solved well. Therefore, development of low power consumption, high power engine has become a hot market. In this paper, a series of F1C engine as the prototype, according to the design idea of tutor team patent application < variable connecting rod type VCR engine connecting rod mechanism of a variable >, link type VCR (Variable Compression Ratio) structure and dynamic performance of the engine mechanism were studied in this research. The study presents a variable compression ratio mechanism design scheme, structure of the main parts of the design calculation and reliability calculation, and the 3D modeling, the static analysis and dynamic analysis, verify the feasibility of the VCR mechanism. In this paper, the main research contents are as follows: according to the structural parameters of a the engine's design idea and F1C series research group for the national invention patent "variable VCR engine connecting rod linkage >, proposes a variable link length VCR engine. In this paper the crank connecting rod mechanism of the VCR engine as the research object, realizes a kind of can be changed according to the length of the connecting rod to realize the compression ratio design changes. With the motion law of the hydraulic cylinder and the connecting rod, the relationship between compression ratio and variable link length were analyzed and calculated. Based on the theoretical analysis. The working principle of the engine crank connecting rod mechanism and the stress situation, determine the structure size of the main components, and the strength check; using CATIA V5 3D design software platform of crank mechanism model was established, which provides a model for simulation. The variable linkage mechanism is simulated by statics Ansys finite element analysis software Workbench, examines the link in the variable in the connecting rod, a piston rod and a hydraulic cylinder respectively by the maximum force when the changes of stress and strain, to verify the reliability of the VCR scheme is reasonable and structure; the ADAMS based dynamic analysis software, the VCR engine mechanism of kinematics and dynamics simulation study the mechanism of the influence on engine performance at different engine speed and different loads, to verify the feasibility of this scheme. The research of VCR mechanism It shows that the scheme of the variable link VCR mechanism is reasonable and feasible, and the structure is stable and reliable. The design of the main components meets the strength requirements, and can improve the performance of engine power and emissions.

【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TK403

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本文編號(hào)：1379707