共查询到19条相似文献,搜索用时 78 毫秒
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前言在过去的五十年里,添加剂生产厂家为了进一步满足汽车、卡车和驱动桥制造者的要求,改进了许多添加剂。例如,双曲线齿轮的发展,促进了极压齿轮油添加剂的问世,以及第二次世界大战年间,发展了多效齿轮油添加剂。极压工业齿轮油的发展就远不如车辆齿轮油那样引人注目。在这种产品系列中,同样类型的添加剂使用了几十年,直到六十年代为止。由于生产的发展,高负荷和高温要求齿轮油改进极压性和热安定性。 相似文献
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以硬脂酸作为修饰剂,利用溶胶-凝胶法制备了油溶性纳米TiO2颗粒,将其加入85W/90GL-5重负荷车辆齿轮油中,用四球摩擦磨损试验机考察了油品的摩擦学性能,并采用SEM、XPS对摩擦试验后的钢球磨斑表面进行了分析,对纳米TiO2在摩擦过程中的摩擦学作用机制进行了研究。结果表明:纳米TiO2添加剂能够显著提高GL-5车辆齿轮油的承载能力;纳米TiO2在摩擦过程中发生分解,在摩擦表面形成硬度较高的纳米薄膜,也可以扩散渗透到金属基体中,从而使保护层不易被剥落。 相似文献
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介绍数控车床主轴自动换档的工作原理、相关系统参数设置及控制流程,对主轴自动换档过程中各种形式的故障进行了归纳、总结,并给出常见故障的分析案例。 相似文献
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Hyun‐Soo Hong 《Lubrication Science》2002,14(4):435-453
New engine design changes and ever‐increasing engine requirements make the design of gear oils challenging. A proper understanding of fundamental lubrication theory and formulation knowledge is necessary to develop new gear oils. This paper provides an overview of the fundamentals of lubrication theory and the functions of each additive. Key technical issues facing gear oils are also discussed. 相似文献
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Methods for the evaluation of the scuffing load capacity of EP lubricants of API GL-4 and GL-5 performance levels have been developed for the standard FZG gear test rig, which has a centre distance of a = 91.5 mm. Procedure A10/16.6R/90 is capable of discriminating between industrial gear oils and automotive gear oils up to GL-4 performance level while procedure S-A10/16.6R/90 can be applied to GL-4 and GL-5 lubricants. The test methods were verified with reference oils and commercial gear lubricants. The results of the tests can be used to give a relative ranking of reference and candidate lubricants. They can also be used as limiting values in the scuffing load capacity rating method according to DIN 3990 (ISO DIS 6336). 相似文献
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Balasubramaniam Vengudusamy Alexander Grafl Franz Novotny‐Farkas Werner Schfmann 《Lubrication Science》2014,26(4):229-249
The friction behaviour of five different gear oils in rolling–sliding and pure sliding contacts and how temperature influences their friction properties were investigated. It is found that increasing temperature decreases boundary friction with gear oils that contain friction modifiers while not for other gear oils, at all contact pressures investigated. In mixed lubrication region, temperature decreases friction at low contact pressures while increases friction at high contact pressures. The effect of slide–roll ratio on friction is significant in boundary lubrication region especially at higher temperature while less significant in mixed lubrication region at both low and high temperatures. The ranking of gear oils for friction in boundary and mixed lubrication regimes is similar both in rolling–sliding and pure sliding contacts, regardless of temperature. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
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传统的齿轮在选用与设计时,需要大量查阅书籍资料.文中针对这一问题,在了解圆信斜齿轮设计准则的基础上,阐述了如何在Auto CAD平台上,通过使用Auto CAD所支持的Visual Basic 语言,设计了圆柱齿轮传动设计中所需要的计算机环境界面,通过输入相关参数,自动完成校核并计算出未知数.在此基础上,通过VBA对点、直线、圆以及各种高级对象的绘制,完成图形的自动生成. 相似文献