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Wet clutch transmission fluid for AWD differentials: base fluid influence on friction characteristics

机译：AWD差速器的湿式离合器变速箱油：基础油对摩擦特性的影响

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摘要

During the past few years several electronically controllable automotive transmission systems, where wet clutches are used as intelligent differentials, have emerged in the market. In this type of application the anti-shudder properties of the lubricants are of vital importance. This paper investigates the influence of base fluids on the anti-shudder properties of transmission fluids for wet clutches in all-wheel-drive systems. The investigated all-wheel-drive system featuring a wet multi-plate clutch with a sintered brass-based friction material is described. The test equipment used to determine the frictional characteristics of the transmission fluid is described. The parameters studied include base fluid type and base fluid viscosity. It is shown that the choice of base fluid has no impact on torque capacity, but that the base fluid influences the temperature dependence of the dynamic friction and the anti-shudder properties. It is also shown that the major effect on the friction characteristics is caused by additive effects rather than base fluid effects.
机译：在过去的几年中，市场上出现了几种电控汽车变速箱系统，其中湿式离合器用作智能差速器。在这种类型的应用中，润滑剂的抗抖性能至关重要。本文研究了基础油对全轮驱动系统中湿式离合器变速箱油抗抖性能的影响。描述了所研究的全轮驱动系统，该系统具有湿式多片离合器，并带有烧结的黄铜基摩擦材料。描述了用于确定变速箱油摩擦特性的测试设备。研究的参数包括基础流体类型和基础流体粘度。结果表明，基础流体的选择对扭矩容量没有影响，但是基础流体影响动摩擦的温度依赖性和抗颤振性能。还表明，对摩擦特性的主要影响是由加性效应而不是基础流体效应引起的。

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