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In this paper, we would like to suggest ways in which to improve the strength of the spider, which is the vulnerable part of the double cardan propeller shaft(DCPS) in medium-duty commercial vehicles. DCPS is composed of a universal joint that consists of spider and yoke, tube, cover spline, and so on. To improve the spider's structural strength, the DCPS assembly model is designed with an ANSYS workbench. This developed model can analyze the strength of the DCPS, and can validate the results of the analysis through a strength test. Finally, we would like to introduce a new spider design that is 20 % stronger than previous DCPS models.

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: This paper represents the structural design of the light weight axle beam for medium duty commercial vehicle using hot press. To reduce the weight of the axle, axle beam of solid type was replaced by hollow type which was made by hot press. According to the change of axle beam structure and manufacturing method, we have to investigate the structural strength and fatigue performance. To verify the axle beam performance, the structural analysis was carried out by simplified axle beam model and various design parameters that are axle beam height, thickness and width. From the analysis results, the light weight axle beam structure was founded and applied the full model analysis. This study will be used as a guidance in development of the light weight axle for medium duty commercial vehicle.