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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Effect of teeth micro-geometrical form modification on contact kinematics and efficiency of high performance transmissions
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Effect of teeth micro-geometrical form modification on contact kinematics and efficiency of high performance transmissions

机译：齿微几何形状修改对接触运动学和高性能变速器效率的影响

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摘要

Light weight, compactness and efficiency are key objectives in high performance vehicular transmission systems, which are subject to large variations in torque and power. Pitch line velocities of up to 52m/s and teeth pair contact pressures of up to 3GPa are routinely encountered under race conditions. Contact patch asymmetry due to angular misalignments between input and output shafts leads to the generation of high edge stress discontinuities on gear flanks, inducing fatigue spalling which affects system durability. Crowning is widely used as a palliative measure to mitigate these undesired effects. These problems can be further exacerbated by contact footprint truncation. The paper presents a new approach to modelling the kinematics and contact micro-geometry of meshing conjunctions of involute spur gears with profile and lead modifications. A time-efficient analytical method is presented to accurately determine the contact footprint and kinematics, leading to the solution of highly loaded non-Newtonian mixed thermo-elastohydrodynamic contact under the extreme prevalent conditions of high performance vehicular transmissions. The effect of tooth form modification on contact footprint truncation, contact kinematics and generated frictional power loss is investigated. This approach has not hitherto been reported in literature.
机译：轻巧，紧凑和高效是高性能车辆变速箱系统的关键目标，该系统在扭矩和功率上会发生较大变化。在比赛条件下，通常会遇到高达52m / s的节距线速度和高达3GPa的齿对接触压力。由于输入轴和输出轴之间的角度未对准而导致的接触面不对称会导致齿轮侧面产生高的边缘应力不连续性，从而导致疲劳剥落，从而影响系统的耐用性。加冕被广泛用作减轻这些不良影响的姑息措施。接触足迹的截断会进一步加剧这些问题。本文提出了一种新的方法，用于对渐开线直齿轮的运动学和接触微几何模型进行仿形和导程修改。提出了一种省时的分析方法来精确确定接触足迹和运动学，从而在高性能车辆变速器的极端普遍条件下解决了高负荷的非牛顿混合热弹流体动力学接触问题。研究了齿形修改对接触足迹截断，接触运动学和产生的摩擦功率损失的影响。迄今为止，尚未在文献中报道这种方法。

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