An investigation of manual transmission drive rattle
An investigation of manual transmission drive rattle
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DOI：
10.1243/14644193jmbd232
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发表时间：
2010-06
期刊：
影响因子：
--
通讯作者：
M. Cruz;S. Theodossiades;H. Rahnejat
中科院分区：
文献类型：
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作者：
M. Cruz;S. Theodossiades;H. Rahnejat
摘要手动变速器齿轮敲击声是汽车工业中的一个NVH（噪声、振动和粗糙度）问题。它是由相应的驱动齿轮对松动（松动）齿轮齿的重复冲击引起的。这种现象发生在各种负载条件下，并相应地进行分类，包括变速器处于空档时的“怠速卡嗒声”和变速器处于节气门全开或部分打开的档位时的“爬行和驱动卡嗒声”。这种现象也存在于从行驶到滑行的条件下，称为超限振动。输入轴上的发动机顺序波动被认为是松动齿轮发出嘎嘎声的根本原因。然而，通过润滑接触传递振动的机制还没有从根本上得到理解。据推测，在不同的散装油的温度下，润滑接触条件的变化可能会发挥关键作用，因此，提供了一个机会，以处理从根本上解决的根本原因的卡嗒声。这意味着需要详细的多物理方法（包括动力学，振动和摩擦学）。本文提供了详细的分析模型的润滑连接在一个多体动力学模型的变速驱动桥七速传动系统在蠕变拨浪鼓的条件下。结果表明，在轻载连接的润滑制度的重要作用，增加了倾向，在较高的温度下嘎嘎作响。研究还表明，发动机阶次振动作为一个启动源的敲击的效果变得显着的流体动力学接触刚度降低，在温度升高。
Abstract Manual transmission gear rattle is an NVH (noise, vibration, and harshness) concern in the automotive industry. It is induced by repetitive impacts on loose (unselected) gear wheel teeth by their corresponding driving pinions. This phenomenon occurs under various loading conditions and is classified accordingly, including ‘idle rattle’ when the transmission is in neutral and ‘creep and drive rattle’ when the transmission is in a gear with a widely open or a partially open throttle. The phenomenon is also present from drive to coast conditions, referred to as overrun rattle. Engine order fluctuations on the input shaft are considered to be the underlying cause for rattle of loose gears. However, the mechanism of transmission of vibration through lubricated contacts is not fundamentally understood. It is surmised that changes in lubricated contact conditions at different bulk oil temperatures may play a key role and, therefore, offer an opportunity to deal with rattle by a root-cause fundamental solution. This means that a detailed multi-physics approach (including dynamics, vibration, and tribology) is needed. This article provides detailed analytical models of lubricated conjunctions in a multi-body dynamics model of a transaxle seven-speed transmission system under creep rattle conditions. The results show the important role of the regime of lubrication in lightly loaded conjunctions, increasing the propensity to rattle at higher temperatures. It is also revealed that the effect of engine order vibration as an initiating source for rattle becomes significant with reduced hydrodynamic contact stiffness at rising temperatures.