The performance of Cu-based friction material in dry clutch engagement
The performance of Cu-based friction material in dry clutch engagement
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DOI：
10.1177/1350650120944281
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发表时间：
2021-06
期刊：
影响因子：
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通讯作者：
Kingsford Koranteng;Joseph-shaahu Shaahu;Ma Chengnan;He-yan Li;Y. Yi
中科院分区：
文献类型：
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作者：
Kingsford Koranteng;Joseph-shaahu Shaahu;Ma Chengnan;He-yan Li;Y. Yi
采用粉末冶金技术制备了一种用于干式离合器系统的铜基摩擦材料。利用万能材料试验机测试了该摩擦材料与65 Mn钢的摩擦特性和磨损率。摩擦副受到两个操作变量，这是滑动速度和温度。研究了这些变量在摩擦副啮合过程中的作用。在已知离合器片法向力和尺寸的情况下，将动态摩擦系数转化为随时间变化的摩擦转矩容量。有人发现，不稳定性可以激发在低操作条件下，当所得的摩擦系数是高的。在25 ℃时，动态摩擦力矩随时间振荡，在400 ℃时也是如此。通常，与改变温度相比，当滑动速度改变时获得更稳定的摩擦扭矩。此外，工作温度和滑动速度对摩擦盘的热屈曲和热弹性不稳定性的影响是本文的第二个考虑因素。当滑动速度超过200 r/min时，热弹性不稳定性开始发生，热点增长率的结果与系统的临界速度吻合得很好。此外，热屈曲高度依赖于摩擦盘的内外半径之间的温差。
An enhanced Cu-based friction material was prepared by the powder metallurgy techniques and proposed for use in the dry clutch system. The friction characteristics and wear rate of this friction material sliding against 65Mn steel are obtained using Universal Material Tester-5. The friction pairs were subjected to two operating variables, which are sliding speed and temperature. The effect of these variables during the engagement process of the friction pairs is investigated. Knowing the normal applied force and dimension of the clutch disc, the dynamic friction coefficient was translated to friction torque capacity with time. It was found that instability can be excited at low operational conditions when the resulting friction coefficient is high. At 25 ℃, the dynamic friction torque oscillates with time likewise at 400 ℃. Generally, a more stable friction torque is obtained when the sliding speed is varied compared to varying the temperatures. Moreover, the influence of the operating temperatures and sliding speeds on thermal buckling and thermoelastic instability of the friction disc is the second consideration in this work. The onset of thermoelastic instability occurs when the sliding speed exceeded 200 r/min and the results for the growth rate of hot spots were found to agree well with the critical speed of the system. Also, thermal buckling was highly dependent on the temperature difference between the inner and outer radius of the friction disc.