Patent ID: 6702345
Filing Date: 2004-03-09
Classification: B60R,B61G,F16F

Abstract:
A shock absorber for a vehicle mounted between the bumper and the frame to transform impact energy applied to the bumper into deformation energy to thereby absorb the energy, wherein:said shock absorber is a multi-diameter stepped tube; said multi-diameter stepped tube consists of different diameter integral tube portions formed by partially reducing or partially enlarging a straight tube that can be plastically deformed, said each different diameter tube portions are integrally joined by steps formed between adjacent edges of each different diameter tube portions, one end of said multi-diameter stepped tube being connected to said bumper, the other end of said multi-diameter stepped tube being connected to the frame of the vehicle; each of the steps formed between the adjacent edges of the different diameter tube portions comprises an overlapped and folded back portion whereby a majority of the impact energy applied to the bumper is spent as plastic deformation of larger diameter tube portions; and a tube passage hole is provided in said fame coaxial with said multi-diameter stepped tube for passing said multi-diameter stepped tube sequentially from said larger diameter tube portion while absorbing impact energy.