Parking gear is essential parts of automotive to park on flat or slope ground. Parking of, especially, big-sized vehicle such as bus and truck is very important problem related to safety. Stability of parking gear may differ from contact location between parking gear and pawl. The purpose of this study is to investigate the influence of stability depending on contact location using numerical analysis. Furthermore the results obtained by numerical analysis were applied to real vehicles to evaluate established-product of parking gear. As the results, safety criterion of parking gear showed below 0.31ton and thus it was confirmed that parking gear of this study was suitable to small-sized vehicle.

Hot forging is widely used to manufacture many industrial parts such as machine, automotive and so on. It is important to simulate the relations or characteristics between preform and die before designing the die. The purpose of this study is to investigate the forging characteristics of parking gear with nonlinear gear groove, thus the behaviors of preform can be predicted in advance and finally they can be applied to die design. As the results, since the distributions of high effective strain rate of parking gear were less than 3%, it was predicted that the manufacturing of parking gear with nonlinear gear groove might be possible. Furthermore it was observed that, in this study, the effective stress of bottom die was lower than that of top die.