Experimental and Analytical Investigation of Tranient Forcesin Roller Chain Devices

本项目研究了滚子链传动中瞬态力的性质。链传动机构自19世纪以来一直在使用，但尽管他们的年龄和广泛的使用，链传动仍然知之甚少。由于该机制成本低且简单，预计将越来越受欢迎。汽车工业目前正在研究将链传动作为未来某些类型乘用车的主要驱动机制的可能性。该项目包括实验和分析两个部分。实验组件有三个阶段，将研究链条上的滚子元件和链轮之间的冲击力，当滚子安装在链轮上时，在所有操作条件下存在于链条中的力，以及在操作条件下链轮齿上的力。早期的研究工作主要集中在建造链条传动试验机，以便在实验活动中使用。冲击力测量是通过用应变片测量链轮，获得各种链轮速度、链轮尺寸和链张力的应变片测量结果，并将测量结果转换为力数据来获得的。这些数据将有助于确定冲击力对滚轮元件磨损和点蚀的影响。第二个实验阶段，测量链条上的力是通过用应变计测量链条的板来完成的。力时间历史信息对于设计目的是有用的。第三个实验阶段，测量链轮齿负载，是通过使用接近传感器完成的。所有的实验证据将用于建立数学模型来预测链传动的动态行为。

This project investigates the nature of the transient forces in roller chain drives. Chain drive mechanisms have been in use since the 1800's, but despite their age and widespread use, chain drives remain poorly understood. The popularity of the mechanism is expected to increase due to its low cost and simplicity. The auto industry is currently investigating the possibility of using the chain drive as the primary drive mechanism for certain types of future passenger cars. The project comprises an experimental and analytical component. The experimental component has three phases and will investigate the impact force between a roller element on the chain and the sprocket as the roller is seated onto the sprocket, the forces that exist in the chain during all operating conditions, and the forces on the sprocket teeth during operating conditions. Earlier research efforts focused on the construction of the chain drive test machine to be used in the experimental activity. Impact force measurements are obtained by instrumenting a sprocket with strain gauges, obtaining strain gauge measurements for a variety of chain speeds and sprocket sizes and chain tensions, and converting the measurements into force data. These data will be instrumental in determining the effect of impact forces in the galling and pitting of roller elements. The second experimental phase, measurement of the forces in the chain is accomplished by instrumenting the plates of the chain with strain gauges. The force time history information is useful for design purposes. The third experimental phase, measurement of sprocket tooth loads, is accomplished by the use of proximity sensors. All experimental evidence will be used to develop mathematical models to predict the dynamic behavior of chain drives.