Abstract
The vehicle is a very important tool for the human movement especially passenger car, its design requirements not only needs comfortable and safety but also considers economic. Since 1973 the energy crisis made a great impact on the world, all governments have attempted to solve this big problem by many ways, some one developed the newly energy like solar cell or fuel cell but the intelligent method is reduce the fuel consumption by lessening the weight of the car. The vehicle structure is very complicate so how to research the new materials and modify the original structure are more efficient to reach that target. The challenge is very difficult within narrow space of the car. Clutches are an old invention but still as common devices for transmitting power in mechanical systems. The general clutch application is to connect two shafts rotating at different speeds and bring the output shaft up to the speed of the input shaft smoothly, and designed to transmit a certain maximum torque like overload protection devices are designed to prevent damage of machinery or production line in the event of an overload, preventing costly repairs and reducing downtime. But all of above traditional designs of the clutch are consists of more components, which are difficult to miniature. So this article is proposed four types simple structure design which can reduce the weight of car and decay assembly time, furthermore, they can minimize the whole mechanism system much easier.