金属V-带推块型CVT的研究(I)——传递转矩和带轮推力间关系

本文在金属V-带推块型CVT上,测出了主、从动带轮的传递转矩和推力以及两带轮间的轴向力。绘出了不同速比下主、从动带轮间相对于转矩比的推力比线图并作相互比较。发现推力比与速比几乎和带轮转速及正常转矩下的最大可传递的转矩无关,该推力比是速比的函数,它和转矩比及推块与带轮间的摩擦系数有关。还导出了带轮推力经验平衡方程式,该式以显函数形式表示。它可以简化并可适用于电控CVT。

金属推块V-带型CVT的研究——Ⅲ部分:金属推块上的作用力

已经用试验实测了稳定工况下推块的压缩力和环的拉力。在以前的工作中已经概要地说明了这种带型的特殊的传动机理。本文采用最近开发设计的推块测量在稳定工况下其他同时作用于推块上的力 ,这些力是推块和环之间的摩擦力 ,推块和带轮间的法向力 ,推块和带轮之间径向和切向摩擦力。根据新的试验数据来详细叙述金属推块 V-带型 CVT的传动机理。本文着重提出以下结论。( 1 )在所有工况 ,推块和环结合的结合点在带轮上具有一个较大的节径 ,它与速比和传递转矩无关 ,在较小带轮上所有推块转速快于环 ,这决定着环的拉力。( 2 )由于推块挤入从动带轮槽内 ,故产生推块压缩力的一次增加现象。( 3)因作用于推块侧面的法向力变大 ,故推块在大带轮的出口处径向摩擦力变成极大。

金属推块V-带型CVT的研究Ⅱ——金属推块和环拉伸之间的压缩力

本研究采用超小型测力仪插入两推块和遥测装置之间在几种固定速比下测量主动和从动带轮上推块压缩力分布。同时采用一种特别设计的推块测出了环拉力的分布。从实验结果可以作出以下结论 :( 1 )推块压缩力分布在主动带轮上明显不同于从动带轮。( 2 )环拉力在带的各边不同 ,这种现象由于两带轮间支承面速度不同造成的。

速度-转矩控制橡胶V-带变速器设计新方法

本文对一个转矩-速度-传感橡胶V-带变速器提出了一个新的模型,在驱动侧作动器是个离心滚子,而一个斜转矩凸轮加一个压缩扭力弹簧则在从动侧。方程式许可设计作动器几何学,以便保持传递转矩在要求的整个工作区间内尽可能转矩闭合。此外,推荐了这类自动变速器最合适的一种设计方法,它许可选择变速器要求的变程,即发动机和变速器之间的匹配以及作动器设计:滚子质量,壳体形状,离心滚子作动器接触扳角度,转矩凸轮作动器斜导轨的斜率。而且发动机变速器匹配对于固定作动器可以作部分负荷计算。本方法已在合适的台架上进行试验证实。

Optimum Determination of Partial Transmission Ratios of Mechanical Driven Systems Using a V-belt and a Three-Step Helical Gearbox

This paper introduces a new study on the optimum calculation of partial transmission ratios of a mechanical drive system using a V-belt and a three-step helical gearbox in order to get the minimum size of the system. The chosen objective function was the cross section dimension of the system. In solving the optimization problem, the design equation for pitting resistance of a gear set was investigated and equations on moment equilibrium condition of a mechanic system including a V-belt and three helical gear units and their regular resistance condition were analysed. From the results of the study, effective formulas for determination of the partial ratios of the V-belt and three-step helical gearboxes were introduced. As using explicit models, the partial ratios can be determined accurately and simply.

Optimum Calculation of Partial Transmission Ratios of Mechanical Driven Systems Using a V-belt and a Two-Step Bevel Helical Gearbox

This paper introduces a new study on the optimum calculation of partial transmission ratios of mechanical drive system using a V-belt and two-step bevel helical gearbox for getting minimum size of the system. In the paper, based on moment equilibrium condition of a mechanic system including V-belt and a two-gear-unit of the gearbox, models for optimum calculation of the partial ratios of the V-belt and the gearbox were proposed. As the models are explicit, the partial ratios can be calculated accurately and simply.

The Convergence Characteristic of the Forward I-V Characteristic Curves of a Semiconductor Silicon Barrier at Different Temperatures

The /-V-（T） characteristic curves of p-n junctions with the forward voltage as the independent variable, the logarithm of forward current as the dependent variable, and the junction temperature as the parameter, almost converge at one point in the first quadrant. The voltage corresponding with the convergence point nearly equals the bandgap of the semiconductor material. This convergence point can be used to obtain the I-V characteristic curve at any temperature.

Global optimization design method for maximizing the capacity of V-belt drive

An optimization model is constructed to formulate the maximization problem on the capacity of V-belt drive. The concavity,the monotonicity and the global optimality condition are studied for the objective function,and it is proved that the feasible region of the model is bounded,closed and convex under some design conditions. Then,a solution method,called an optimal segment algorithm,is developed to find the global maximizer of the model. Under four different design conditions,solution methods are presented respectively. Some real case studies are employed to demonstrate that the model and the algorithm in this paper are promising.