偏心圆弧型超越离合器工作型面设计方法及误差分析

为克服现有超越离合器工作型面加工难度大、加工成本高以及加工精度低等缺点,在分析超越离合器结构及工作条件的基础上,提出一种偏心圆弧型超越离合器工作型面的设计方法;以某家用汽车使用的对数螺线型超越离合器为例,应用提出的方法完成了该离合器偏心圆弧工作型面的设计,通过比较前后两种工作型面楔角及中心距等方面的误差,对该方法的可行性进行了验证。结果表明,该方法设计的偏心圆弧型面与原有对数螺线型面相比,误差较小,且因改进后的超越离合器工作型面采用圆弧面,加工难度大为降低、加工精度较好,从而在保证加工质量的前提下降低了加工成本。

Design Method and Error Analysis of Working Surface of Eccentric Circular Arc Type Overrunning Clutch

In order to overcome the shortcomings of the existing working surface of the overrunning clutch, such as high machining difficulty, high processing cost and low machining accuracy, in view of the design method of the working face of the logarithmic spiral type overrunning clutch, on the basis of the analysis of the overrunning clutch structure and working conditions, a design method for the working surface of eccentric circular arc type overrunning clutch is proposed. Taking a logarithmic spiral type overrunning clutch used in a domestic automobile as an example, the design of the eccentric circular arc working surface of the clutch is completed by using the proposed method. The feasibility of the method is verified by comparing the errors of the two types of working surfaces, such as wedge angle and center distance. The results show that the error of the eccentric circular arc surface designed by this method is smaller than that of the original logarithmic spiral surface. In addition, the machining difficulty is greatly reduced and the machining precision is better because of the use of the circular arc surface for the improved overrunning clutch working surface. And the processing cost is reduced under the premise of guaranteeing the processing quality.