Shock absorbing device for vehicle with multiple shock absorbing stages

A collision energy absorbing apparatus for use in a vehicle, having a plurality of absorption phases, the apparatus comprising:

• a first deformation part having a tube shape;
• a second transformation part formed to have a tube shape and disposed in line with an end of the first deformation part;
• and
• an expansion inducing part combined with an end of the second deformation part and disposed between the first deformation part and the second deformation part,
• the first deformation part undergoing a first plastic deformation due to expansion so as to absorb collision energy generated in the event of a vehicle accident and then undergoing a second plastic deformation through crushing, the second transformation part undergoing the plastic deformation through the crushing after the first plastic deformation of the first deformation part so as to sequentially absorb collision energy in the event of the vehicle accident, and the expansion inducing part being configured to guide the first plastic deformation of the first deformation part in the event of the vehicle accident,
• wherein the first deformation part is formed to have a length longer than that of the second deformation part such that the first and second deformation parts together undergo the third plastic deformation through crushing after the first deformation part undergoes the second plastic deformation through crushing in a portion of the first deformation part after the first plastic deformation of the first deformation part.