本文選題：柴油機(jī)曲柄連桿機(jī)構(gòu)　切入點(diǎn)：軸承　出處：《重慶大學(xué)》2015年碩士論文

【摘要】：目前國(guó)內(nèi)外對(duì)柴油機(jī)曲柄連桿機(jī)構(gòu)軸承研究主要從軸承的鋼背材料、合金層的鍍層材料性能、軸承壁厚、軸承間隙、軸承油膜、軸承材料的抗咬合性、耐腐蝕性、磨合性方面進(jìn)行研究,設(shè)計(jì)出的軸承材料利用率低、價(jià)格昂貴、磨合期易出現(xiàn)拉傷或抱死故障、軸承間隙偏大、磨損大、壽命低、整機(jī)潤(rùn)滑系統(tǒng)機(jī)油流量偏大、整機(jī)低轉(zhuǎn)速機(jī)油壓力過(guò)低報(bào)警、活塞冷卻不良等問(wèn)題。針對(duì)這些問(wèn)題,本課題從柴油機(jī)曲柄連桿機(jī)構(gòu)運(yùn)轉(zhuǎn)情況為背景進(jìn)行研究,重點(diǎn)研究軸承油孔油槽布置對(duì)軸承潤(rùn)滑、受力、以及對(duì)機(jī)油系統(tǒng)壓力和流量的影響。首先從運(yùn)動(dòng)力學(xué)角度出發(fā),分析CW6250曲軸軸頸和軸承的載荷分布情況,得出曲軸和軸承油槽油孔布置設(shè)計(jì)時(shí)需避開(kāi)的重負(fù)荷分布區(qū)域;然后軸承工作的重負(fù)荷、高速度、高溫度、結(jié)構(gòu)空間受限的特殊性出發(fā),對(duì)CW6250曲柄連桿機(jī)構(gòu)軸承關(guān)鍵方面進(jìn)行了合理性分析,得出了CW6250主軸瓦和連桿小端襯套的設(shè)計(jì)是合理的,而連桿大端軸瓦油槽和油孔的布置設(shè)計(jì)是極不合理的,需對(duì)其進(jìn)行改進(jìn);其次從CW6250曲軸油孔布置和活塞的冷卻方式出發(fā),建立曲柄連桿機(jī)構(gòu)軸承供油模型,對(duì)油槽和油孔第一次改進(jìn)前和改進(jìn)后的連桿大端軸瓦的載荷、供油情況、活塞的冷卻、整機(jī)機(jī)油壓力和流量消耗進(jìn)行分析,提出了新的改進(jìn)方案;最后采Excite-Designer仿真分析軟件和臺(tái)架試驗(yàn),對(duì)改進(jìn)軸承進(jìn)行仿真分析校核計(jì)算和臺(tái)架驗(yàn)證。從軸承磨損、軸頸磨損、活塞冷卻、機(jī)油壓力、機(jī)油流量方面看,油槽和油孔改進(jìn)的連桿軸瓦達(dá)到了預(yù)期改進(jìn)效果,解決了改進(jìn)前軸承異常偏磨、活塞冷卻不良、整機(jī)系統(tǒng)機(jī)油流量偏大、機(jī)油壓力偏低報(bào)警問(wèn)題,提高軸承的可靠性,滿足了柴油機(jī)的使用要求,同時(shí)降低整機(jī)機(jī)油系統(tǒng)流量和負(fù)功率消耗,提高了柴油機(jī)的經(jīng)濟(jì)性。
[Abstract]:At home and abroad to study the bearing crank connecting rod mechanism of diesel engine main bearing steel back from the material properties of the coating material, alloy layer, bearing wall thickness, bearing clearance, bearing oil film bearing, anti bite material, corrosion resistance, are studied in terms of use, low rate of bearing material design price expensive, prone to injury or death in the fault, the bearing clearance is too large, wear, low life, large oil flow lubrication system, the low speed and low oil pressure alarm problem, piston cooling bad. To solve these problems, this topic from the operation of the diesel engine crank connecting rod mechanism as the research background. Focus on the bearing oil hole oil groove is arranged on the stress bearing lubrication, and the effects on the oil pressure and flow. The first movement from the view of mechanics analysis of the load distribution of CW6250 crankshaft and bearing, The crankshaft and bearing oil groove oil hole layout design to avoid the heavy load distribution obtained; then heavy load bearing work, high speed, high temperature, special structure of the limited space of the CW6250 crank bearing key aspects of the rationality analysis, the design of CW6250 main bearing and the connecting rod small end the bushing is reasonable, and the layout design of connecting rod big end bearing oil groove and oil hole is extremely unreasonable, which needs to be improved; second from the cooling mode of CW6250 crankshaft oil hole arrangement and the piston of a crank shaft bearing oil supply model, load, on the connecting rod big end bearing oil groove and oil hole the first time before and after the improvement of the supply situation, the cooling of the oil pressure and flow consumption analysis, put forward new improvement scheme; finally, Excite-Designer software simulation analysis and bench test on Simulation calculation and verification bench bearing improvement. From bearing wear, the shaft neck wear, piston cooling, oil pressure, oil flow, connecting rod bearing oil groove and hole to achieve the desired improvement effect, solve the improvement of front bearing abnormal abrasion, piston cooling bad system oil flow too large, low oil pressure alarm, improve the reliability of bearings, meet the requirements of the diesel engine, and reduce the flow of oil system and negative power consumption, improve the economy of diesel engine.

【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TK423

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5 周s，

本文編號(hào)：1676304