湿式离合器摩擦片的热结构耦合分析

Thermal-structural coupling analysis of wet clutch friction discs

利用ANSYS软件,采用直接耦合方法,对带有周向槽和径向槽的摩擦片在滑摩过程中的温度场和应力场进行仿真计算和分析。在计算过程中考虑了摩擦片和对偶钢片摩擦所产生的热分配情况,以及摩擦片与沟槽内润滑油和外界空气的热交换,并同时考虑了各种位移约束。研究发现在滑摩过程中摩擦片的最高温度出现在摩擦表面,最高等效应力出现在沟槽内,两者的最大值出现在滑摩过程的中前期,数值分别为148.1℃和146 MPa;在每个小摩擦表面会形成椭圆热区,并且温度中间高,四周低;沿半径方向,半径越大,温度越高,小摩擦面上的温度分布为凸抛物线型,沟槽面为凹抛物线型。

The temperature field and stress field of friction discs with circumferential and radial grooves during sliding processes were simulated and analyzed by direct coupled finite element method on the ANSYS platform. During this simulation the following factors were taken into account： the heat produced during the rubbing transfer of the friction disc and the separator disc, the heat transfer between the friction disc and lubrication or outside air, and displacement constraints. Simulation results reveal that the highest temperature and the biggest stress are 148.1 ℃ on the friction disc surface and 146 MPa in the groove, respectively, and they both appear in the earlier process. An ellipse hot spot forms on every small friction surface, and temperature in the middle is higher than that in the surrounding. Along the radius direction, the larger the radius is, the higher the temperature is, and the temperature distribution is a convex parabolic profile on the small friction surface and a concave parabolic profile on the small groove surface.