Wet clutch friction characteristics obtained from simplified pin on disc test
Wet clutch friction characteristics obtained from simplified pin on disc test
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DOI：
10.1016/j.triboint.2007.11.014
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发表时间：
2008-09-01
影响因子：
6.2
通讯作者：
Larsson, Roland
中科院分区：
文献类型：
--
作者：
Marklund, Par;Larsson, Roland
车辆传动系中湿式离合器的摩擦性能对其整体性能至关重要。在新的湿式离合器系统的开发过程中，需要了解这种摩擦行为。传递的扭矩通常在试验台中进行研究，其中研究摩擦盘和分离器盘之间的滑动界面中的摩擦。这些试验台可以根据所研究离合器的工作条件进行不同的设计。然而，现在可以模拟离合器性能，而不局限于仅使用来自试验台的测量值来设计湿式离合器。离合器在接合过程中传递的扭矩可大致分为全膜扭矩和边界润滑扭矩。全膜状态可以很好地模拟，而边界状态中的摩擦由于其强的附加依赖性而更难以模拟。为了获得一个很好的预测的总啮合，在边界润滑制度的摩擦测量仍然需要。这些测量应易于执行，最好是快速测试。应测量整个滑动速度、界面温度和标称表面压力范围内的摩擦系数。为了在模拟中使用这些测量结果并更好地了解摩擦行为，最好在温度和滑动速度可以被视为恒定的小测试样品上进行这些测量。这里，在销盘测试中研究湿式离合器摩擦盘的小样品的摩擦，并在测试期间测量样品中的温度。测量结果进行了比较，从整个摩擦片的试验台的测量。实现了不同测量方法的摩擦行为之间的良好对应。(C)2007爱思唯尔有限公司保留所有权利。
The frictional behavior of wet clutches in vehicle drivetrains is critical for their overall behavior. During the development of new wet clutch systems there is a need to know this friction behavior. The transferred torque is normally investigated in test rigs where the friction in a sliding interface between a friction disc and separator disc is investigated. These test rigs can be designed differently, depending on the working conditions of the investigated clutch. However, it is possible today to simulate the clutch behavior and not limit ourselves to only using measurements from test rigs for the design of the wet clutch. The torque transferred by the clutch during engagement can be roughly divided into full film torque and boundary lubrication torque. The full film regime is possible to simulate quite well, whereas the friction in the boundary regime is much more difficult to simulate due to its strong additive dependency. To obtain a good prediction of the total engagement, friction measurements in the boundary lubrication regime are still needed. These measurements should be easy to perform and fast tests are preferable. Friction coefficients for the whole range of sliding speed, interface temperature and nominal surface pressure should be measured. To use these measurements in simulations and get a better understanding of the friction behavior, it is also preferable to conduct these measurements on a small test sample, for which the temperature and sliding speed can be regarded as constant.Here, the friction of a small sample of a wet clutch friction disc is investigated in a pin on disc test and the temperature is measured in the sample during the tests. Measurements are compared with measurements from a test rig for whole friction discs. A good correspondence between the frictional behaviors of the different measurement methods is achieved. (C) 2007 Elsevier Ltd. All rights reserved.