A Method for Performing Quality Comparisons of Rzeppa Joints

In the present work a methodology of metrological kind is suggested. The procedure has been developed to give information on the relative quality between two or more standard sets of Rzeppa joints made up by different factories. The methodology suggested is based on dimension and hardness evaluations. The main aim of the dimensional evaluations is the tolerances check that characterize the grooves of the inner and outer races. The hardness evaluations are considered with reference to the tribological aspects. In order to perform a position analysis of the inner and outer races in relation to the six spheres, a suitable CAD model has been made up. This model is essential because it gives the greatest change of certain nominal distances that must be measured versus the axes angle of the inner and outer races. The results obtained in relation to two sets of joints nominally of the same kind but manufactured by two different factories are presented.