共查询到16条相似文献,搜索用时 94 毫秒
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研究超声波降黏技术对润滑油黏度和温度的影响。通过搭建润滑油超声降黏试验装置,研究在超声作用和水浴作用下润滑油黏度和温度之间的关系,分析超声降黏机制。结果表明:在温度点相同情况下,超声降黏比水浴降黏效果更好,超声作用相比于水浴加热的降黏幅度更大;润滑油降黏率随着超声作用时间的增加先增大而后趋于稳定,频率42 kHz、超声功率70 W超声波作用10W-50润滑油30 min左右,其降黏率就达74.1%;润滑油的超声降黏机制,除了超声热作用外,还包括超声空化和机械效应;在相同的温度条件下,超声波的热作用对高黏度油样的降黏效果好于低黏度油;超声机械效应可以起到搅拌和均化的作用,促进润滑油温度的均匀化。 相似文献
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《机械传动》2017,(7)
变速器作为传动系关键的零部件之一,直接影响整车的NEDC油耗。为了提升某MPV车型的NEDC综合油耗,提出了一种基于NEDC工况的变速器效率测试方法,并利用该方法对比了不同润滑油的黏度、温度、添加剂等因素对变速箱传动效率的影响。试验表明,该测试方法能更准确地反映变速器NEDC工况下的综合效率;润滑油黏度相对越低,变速器的传动效率越高;油温升高引起的油膜厚度的减少对变速器效率的影响大于因转速升高引起的油膜厚度的增加对变速器效率的影响,且有利于提高变速器的传动效率;润滑油增黏剂有利于提升油品的黏温特性,且在一定温度范围内,随着温度的升高,润滑油黏温特性对于变速器传动效率的影响大于润滑油黏度对变速器传动效率的影响。 相似文献
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节能减排作为汽车领域发展的重要趋势,变速器作为传动系核心部件,需进一步优化以提升其传动效率。针对某国产5挡手动变速器轴承进行研究,分别考虑了轴承精度、轴承游隙以及轴承密封结构对变速器不同工况下传动效率的影响。结果表明,轴承精度提高可提升变速器低挡位的传动效率,但对高挡位的传动效率影响很小;相比于原厂C3组游隙,采用Cm组和C5组游隙均可提升变速器的传动效率,但Cm组游隙所提升的工况更接近真实工况;轴承密封结构所产生的摩擦力矩占轴承总摩擦力矩85%以上,存在很大优化空间。制定变速器轴承优化方案,通过整车WLTC(World-wide harmonized light duty test cycle)油耗测试发现,采用Cm组轴承游隙和非接触式密封结构可以降低0.97%的整车WLTC油耗。 相似文献
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发动机润滑油黏度等级对其性能的影响 总被引:1,自引:1,他引:0
为适应柴油发动机在不同环境条件下使用的需要,出现了不同黏度等级的润滑油,但润滑油黏度等级与其低温性能、高温性能、抗磨损性能等使用性能之间的相互关系还不够十分明确。实验研究润滑油黏度等级对其低温性能、高温性能和润滑性能等的影响。结果表明,内燃机油的黏度等级对其低温性能和润滑性能影响显著,高黏度等级润滑油温度较低时黏度增加较快,影响发动机的低温启动并加剧磨损,且功耗增加,但较高黏度等级润滑油有利于摩擦表面油膜的形成,可改善润滑;内燃机油的黏度对其高温性能有一定影响,较高的黏度有利于减小蒸发损失,但对高温清净性影响不大。 相似文献
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薛远水 《机械制造与自动化》2021,50(4):139-141
为探究润滑油黏度对齿轮振动特性的影响,运用传动系统仿真软件Romax建立齿轮啮合润滑模型,分析了两种不同黏度润滑油时齿轮啮合润滑油膜厚度;在齿轮运转试验台架上对使用不同黏度润滑油的两对齿轮分别进行振动试验,采集振动信号数据;利用MATLAB对振动数据进行频域处理,对比结果并从齿面润滑状态以及微凸体相互作用的角度,对两对... 相似文献
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It has been suggested in the literature that the ability of a lubricant to produce low “end of test temperature” (EOTT) in the achsialrillenkugellager (ARKL)—that is, axial groove ball bearing—thrust bearing test is an indicator of its likely efficiency in vehicle transmissions. Based on this, the current study has used regression analysis to correlate the ARKL EOTT with a range of physical and friction properties of a set of 26 lubricants. The latter have been selected to span a wide variety of base oil and additives types. It has been found that the most important lubricant property in determining ARKL EOTT is the elastohydrodynamic (EHD) friction or traction coefficient at low slide–roll ratio. Lubricants with low EHD friction were found to give low EOTT. Two lubricant properties of secondary importance have been identified. One is the lubricant viscosity index (VI), where a high VI contributes to high EOTT. The second is the heat transfer capability of the fluid, where a high capability was found to correlate with lower EOTT. The findings help clarify how low EOTT in the ARKL test can be achieved via lubricant composition. If the correlation between ARKL and transmissions that has been suggested in the literature is valid, then these findings are transferable to the design of high efficiency transmission lubricants. 相似文献
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An Experimental Investigation of the Influence of the Lubricant Viscosity and Additives on Gear Wear
The influence of lubricant viscosity and additives on the average wear rate of spur gear pairs was investigated experimentally. The gear specimens of a comprehensive gear durability test program that made use of seven lubricants covering a range of viscosities were examined to measure gear tooth wear. The measured wear was related to the as-manufactured surface roughness, the elastohydrodynamic film thickness, and the experimentally determined contact fatigue lives of the same specimens. In general, the wear rate was found to be inversely proportional to the viscosity of the lubricant and to the lambda ratio (also sometimes called the specific film thickness). The data also show an exponential trend between the average wear rates and the surface fatigue lives. Lubricants with similar viscosities but differing additives and compositions had somewhat differing gear surface fatigue lives and wear rates. 相似文献
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《机械传动》2017,(9)
采用试验研究的方法,对机械式汽车变速器的传动效率以及影响因素进行研究。搭建机械式汽车变速器传动效率的测试台架,制造出相关测试样件并进行测试研究。试验结果表明,保持加载转矩不变,变速器各个挡位下的传动效率随着输入转速的增加而增加,最终到达最大值,随后逐渐下降;保持相同输入转速和加载转矩,挡位置于Ⅳ挡时变速器的传动效率最高;保持输入转速不变,变速器各个挡位下的传动效率随着加载转矩的增加而增加;如果通过采用多级齿轮油或合成油来改善润滑油黏-温特性,变速器的综合效率可分别提高0.62%和0.96%;如果使用开式轴承来减少轴承摩擦损耗,变速器的综合效率可以提高0.52%。 相似文献