INCERCARI DE REZISTENTA IN FUNCTIONARE A ARBORELUI CU CAME TUBULAR

摘要

The tubular camshaft represents a modern constructive solution that, in comparison with the classic shaft, shows the following advantages: the diminishing of the mass by 0,52 kg, which means economy of material and labour and, especially, the diminishing of the inert masses. Due to the diminishing of the section of the shaft and of the fabrication of cams different from those of the shaft, it was imposed the necessity of the testing mechanical requirements of the shaft and of its resistance to usage of the working surfaces of the cams. These tests were carried out by two ways: by checking the functioning on a stand designed and made by the authors, as well as by mathematical modeling with the help of ALGOR programme. After the testing there arose the following conclusions: -the resistance to usage of the cams is comparable to the cams on the classic shaft; -by comparing the values of the tensions and benching for the two alternatives of the shaft Of distribution there was found out that the deviation in percentage lies 0.9...8% for tensions, while for benching 14.2...20.9%. This small difference is to be explained by the values of the modules of axial resistance, namely polarization of fulkl circular sections being 5 ... 10% higher than the same values calculated for a tubular section of the same exterior diameter; -for none of the alternatives of calculation, namely for none of the cases of loading, the values of the admittable loading of the values were not surpassing.