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A mathematical model is proposed for tooth vibrations in chevron gear transmissions. Methods of reducing the vibrations in
spiral engagement are outlined. 相似文献
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齿轮传动中磨损问题的研究及修复方法综述 总被引:1,自引:1,他引:1
齿轮传动是机器传递运动和动力的一种主要形式。如何减少齿轮工作中的磨损、延长其使用寿命是工业生产中至关重要的问题.总结了齿轮磨损问题的基本类型、研究历程、研究方法以及失效齿轮的常用修复方法等. 相似文献
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履带车辆齿轮传动系统非线性振动特性研究 总被引:1,自引:1,他引:1
以齿轮系统动力学和非线性振动理论为基础,针对具有齿侧间隙和时变啮合刚度的某履带车辆齿轮传动系统,建立单自由度齿轮系统非线性振动模型,通过数值仿真方法求解并分析在不同档位下的振动特性,并对其在某些变量参数下进行了振动特性研究,所得结果既反映了动力学性能,又为下一步进行多自由度齿轮系统的非线性振动研究提供了有力的依据. 相似文献
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搬运车辆传动系统的液力变速箱由于受到外形空间尺寸和结构的严格限制,经常采用内啮合齿轮泵。啮合齿轮泵是液力变速箱控制操作的动力源,关键的核心部件之一,其工作状态决定了车辆的行驶性能、操作性能的优劣。 相似文献
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齿轮变位对传动振动的影响 总被引:1,自引:0,他引:1
本文就齿轮变位对传动振动的影响作了分析,探讨了通过选择适当的变位形式与变位系数降低传动振动的方法。同时还作了模型试验,试验结果与理论分析结果基本吻合。 相似文献
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This paper will concentrate on acetal gear wear behaviour and its performance prediction based on the extensive investigations on the gear thermal mechanical contact both experimentally and numerically. It has been found from the tests that acetal gear wear rate will be increased dramatically when the load reaches a critical value for a specific geometry and running speed. The gear surface will wear slowly with a low specific wear rate if the gear is loaded below the critical one. The possible reason of the sudden increase in wear rate is due to the gear operating temperature reaching the material melting point under the critical load condition. Gear surface temperature has been then investigated in details through three components: ambient, bulk and flash temperatures. Through extensive experimental investigations and modelling on gear surface temperature variations, a general relation has been built up between gear surface temperature and gear load capacity. An approach for acetal gear transition torque prediction has been proposed and this method is based on the link between polymer gear wear rate and its surface temperature. The method has been related to test results under different operating speeds and gear geometries. Good agreements have been achieved between the proposed method predictions and experimental test results. 相似文献
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Friction tests were carried out with an elastic system where the specimen was supported by the elastic plate spring with strain gauges and with a rigid system where the vibration of the specimen was restricted. The coefficient of friction was obtained by two different methods: a deflection method with an assembly that consisted of a spring and strain gauges and an inertia method with a flywheel. The friction and wear properties of steel-steel, white metal-steel, phosphor bronze-steel and bronze-steel pairs were examined. When the frictional operation was conducted in the elastic system accompanied by frictional vibration, the coefficient of friction measured by the deflection method was generally larger than by the inertia method. The relationships between the coefficient of friction and the driving velocity for steel-steel and white metal-steel pairs obtained by the inertia method in the rigid system were significantly different from those obtained by the same method in the elastic system. Frictional vibration increased the wear of white metal-steel, phosphor bronze-steel and bronze-steel pairs but decreased that of a steel-steel pair. Wear measurements from the elastic system exhibited more scatter than from the rigid system. 相似文献
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S. Khalilpourazary S. S. Meshkat 《The International Journal of Advanced Manufacturing Technology》2014,71(9-12):1599-1610
Hobbing process is one of the machining methods in manufacturing spur gears. In machining processes, selecting a suitable lubricant is one of the significant factors in enhancing machining productivity and improving the characteristics of manufactured workpieces. This study has used the nanolubricant including alumina nanoparticles dispersed in mineral-based oil 25W-50 in hobbing process. Then, hobbing process using the lubricant including both nanoparticles, and none has been done utilizing with the similar hob tools. Two spur gears with DIN1.7131 material have been manufactured using each of two lubricants. Then, the hob tool wear and surface roughness values of manufactured spur gears were investigated. Comparing the results show that using lubricant including alumina nanoparticles in hobbing process causes an expressive decrease in the hob tool crater and flank wear. Also, arithmetic surface roughness value in spur gears manufactured with nanolubricant has decreased. 相似文献
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Results of investigations of the effect of hob wear on the surface layer properties of hobbed gear teeth are presented in this paper. The influence of hob wear on the microhardness, surface roughness, residual stresses and surface layer thickness were investigated. On the basis of the experimental results it was found that hob wear has a significant influence on the surface layer properties of the gear teeth. This influence is most noticeable on the dedendum and root fillet where the gear tooth space is shaped by the bluntest part of the hob cutting edges. 相似文献
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对传动系统扭转振动有限元模型应用LANCZOS迭代方法计算固有频率,用MATLAB调用NASTRAN进行迭代,在参数的整个设计空间范围内利用回归分析技术以显式的响应面模型逼近特征量与设计参数间复杂的隐式函数关系。选择较难确定或随时间变化的且对响应特征较为敏感的模型参数作为响应面输入参数,从输入参数的正态分布中抽取样本,利用响应面函数计算样本点的响应值,拟合出响应固有频率值的正态分布。根据工作转速给出传动系统工作频率的分布情况,从而根据可靠性分析方法计算出在模型参数不确定前提下系统不发生共振的可靠度。 相似文献
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变速箱倒档齿轮系统动态传动过程仿真分析 总被引:1,自引:0,他引:1
应用Abaqua/Explicit显式动态分析方法仿真某车型变速箱内倒档齿轮传动系统的动态传动过程,全面直观地得到了齿轮传动系统的动态接触压力云图、齿根弯曲应力曲线和振动特性曲线.并对仿真结果进行分析,最后总结了仿真分析在变速箱设计过程中的重要作用. 相似文献
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Gears are used for transmission of power, motion or both. Under increased power and higher speeds, tribological failures such as scuffing, pitting, mild wear and tooth breakage are of major concern. This paper presents the results of experimental investigations carried out to assess wear in spur gears of a back-to-back gear box under accelerated test conditions. The studies considered the estimation of specific lubricant film thickness and its effects on the fault growth on gear teeth surface. Ensemble empirical mode decomposition (EEMD) technique is used to extract the fault related features from the vibration signals acquired from the gearbox. The results highlight the advantage of EEMD technique for effective assessment of wear in spurgears. 相似文献
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汽车变速器齿轮的强度分析 总被引:1,自引:0,他引:1
变速器是汽车动力传递的关键部件,变速器齿轮更是变速器的关键部分,它的强度关系到传动的质量,从而影响汽车的整体性能,在汽车改型过程中,在略加大发动机功率的情况下,对变速器齿轮的强度情况进行校核,从而为改型提供依据。 相似文献