World Widely, a lot of gearboxes are being developed for the increase of fuel efficiency. Among them, CVT has an infinite gear and shifts gear at the best situation which makes it have no impact by changing speed and reduce the expense of fuel. We designed and manufactured 2ranked gearbox for V-belt similar to CVT. We studied an energy generated when it is functioning and had an experiment of forwarding power of it. These studies are planned to find out its functions and the efficiency of forwarding power of it.

This paper concerned with design of constant stress accelerated lift test(ALT). Becase a major factor to affect a life of automotive V-ribbed belts is a temperature, we selected a temperature as a accelerated fator to perform a test. Acclelerated life test plans were developed with the assumption of weibull lifetime distribution. The genreal value of beta parameter was accepted in this life test (β=1.1). The sample number was calculated by alpha parameter which was induced by beta.