表面粗糙和带槽的湿式离合器接合的有限元模型

Finite Element Modeling of Engagement of Rough And Grooved Wet Clutches

已经开发了一个有限元模型,研究表面粗糙和带槽纸质可渗透的湿式离合器的接合特性。采用有限元方法(Galerkin)离散修正雷诺和力平衡方程式,采用等参量方程式解所描述的有关内何学。通过Patir和Cheng(1978)的通用流量模型模拟表面粗糙度的影响。在表面粗糙状况下,采用Greenwond和William son(1966)方法计算负荷分配,采用开发的有限元模型研究所加负荷的影响,以及湿式离合器摩擦材料的渗透率和槽出入口尺寸的接合特性(即转矩、油压、接合时间和油膜厚度)。研究结果表明,所加负荷、摩擦材料渗透率和槽宽度对接合特性的影响显著。高的配合面压力增大了峰值和减少了接合时间但显著增大了峰值转矩,宽油槽减少峰值转矩和增加了接合时间。对于本模型油槽深度对接合特性的影响不太明显。

A finite element model has been developed to investigate the engagement of rough, grooved, pa- per-based permeable wet clutches. The finite element（Galerkin） approach was used to discretize the modi- fied Reynolds and force balance equations, and the solution domain geometry was described using an iso- parametric formulation. Surface roughness effects were modeled via the Patir and Cheng（1978） average flow model, while asperity, load sharing was calculated using the Greenwood and Williamson（1966） ap- proach. The finite element model developed was used to investigate the effects of applied load, friction ma- terial permeability, and groove size on the engagement characteristics of wet clutches（i, e. , torque, pres- sure, engagement time, and film thickness）. The results indicate that the applied load, friction material permeability, and groove width significantly influence the engagement characteristics. Higher facing pres- sures increase peak torque and decrease engagement time. Higher permeability of the friction material sig- nificantly decreases engagement time but dramatically increases peak torque. Wider grooves decrease the peak torque and increase the engagement time. Groove depth does not significantly affect engagement characteristics for this model.