蜗轮稳态温度场的模拟及影响因素分析

Simulation of a steady temperature field and analysis of factors affecting a worm gear

为了获得蜗轮齿面本体温度的分布特征,结合传热学、摩擦学及啮合原理,对啮合过程中轮齿的对流换热系数和齿面摩擦热流密度进行了数值模拟,建立了轮齿温度场的有限元分析模型,并对不同载荷和转速条件下,轮齿接触面本体温度的变化趋势进行了研究。结果表明:齿面本体温度沿齿宽方向的分布是不对称的,蜗轮齿面的啮入端、中间区、啮出端按低温、高温、中温分布;最大本体温度产生于轮齿齿面的节线附近;蜗轮副传递的转矩越大,齿面最大本体温度随转速增加的变化趋势越明显。

To obtain the distribution characteristic of the temperature on the surface of worm gear, a numerical simulation using heat transfer theory, tribology theory, and mesh theory is given to calculate the heat transfer coefficient and heat flux of rolling gear teeth. A FEA modeling procedure is developed to analyze the gear teeth temperature field. Under different load and speed conditions, the tooth surface bulk temperature trend also is analyzed. The results indicate that distribution of the tooth surface bulk temperature along tooth width is asymmetrical. The temperature in the engaging-out area is higher than the engaging-in area, and the highest bulk temperature occurs near the tooth surface pitch line. The trend that the highest bulk temperature changes with the rotation-speed is more obvious when transmitting greater torque.