Shock absorpting vehicle body structure

A shock absorbing vehicle body structure comprising:

• a substantially quadrilateral front subsidiary frame including left and right side members extending in a longitudinal direction of a vehicle body and connected to each other at front and rear ends thereof by a front cross member and a rear cross member;
• main frames of the vehicle body, on which said front subsidiary frame is supported at four corners thereof;
• and
• time lag means for creating a time lag between separation of rear portions of said left and right side members, respectively, from said main frames as caused by a longitudinal load transmitted to said left and right side members upon full-lap collision of the vehicle;
• said time lag means including left and right bolts fixing left and right rear portions of said left and right side members to said main frames, said left and right bolts having different strengths.

A shock absorbing vehicle body structure comprising:

• a substantially quadrilateral front subsidiary frame including left and right side members extending in a longitudinal direction of a vehicle body and connected to each other at front and rear ends thereof by a front cross member and a rear cross member;
• and
• main frames of the vehicle body, on which said front subsidiary frame is supported at four corners thereof;
• said left and right side frames having different rigidities to a longitudinal load applied thereto for creating a time lag between separation of rear portions of said left and right side members, respectively, from said main frames as caused by a longitudinal load transmitted to said left and right side members upon full-lap collision of the vehicle.