【摘要】 温度改变可以让形状记忆合金(SMA)实现两种不同的宏观形状的转换,这种形状间转变的能力,使得它成为驱动技术的新研究方向。特别是镍钛形状记忆合金在高循环稳定性组合装置中表现出的高驱动力和调节行程能力。形状记忆效应是基于SMA致动器在马氏体和奥氏体相之间的转换。由于相变的转变温度在20~100℃,使镍钛形状记忆合金的工程应用研究中极受欢迎。文章研究的技术是利用镍钛记忆合金作为驱动,使离合器完成啮合分离动作。传动系统的启动加速致使超过额定速度时,则系统就需要一个更高的扭矩。这一要求则可以通过不增加离合器外观的标称尺寸,仅通过镍钛形状记忆合金便可实现。更多还原

【Abstract】 The ability of Shape Memory Alloys(SMA) to remind two different macroscopic shapes and to alter between these shapes by changing their temperature,leads to innovative approaches within drive technology.Especially Nickel-Titanium(Ni-Ti) Shape Memory Alloys offer high actuating forces and adjustment travel in combination with high cycle stability.The shape memory effect is based on the transformation between martensitic and austenitic microstructure depending on the temperature of the actuators.The transformation temperatures in the range of 20℃ to 100℃ make Ni-Ti SMA attractive for engineering applications.This paper investigates the technical use of Ni-Ti SMA as actuators within a start-up clutch.The start-up of a drive train demands a higher torque,caused by the acceleration of the masses,than during the nominal speed.This demand can be realized with Ni-Ti-Shape Memory Alloys(Ni-Ti SMA) without increasing the nominal size of the clutch appreciable.更多还原