Vehicle seat

Abstract

Provided is a vehicle seat having a high absorbing efficiency of impact energy upon rear end collision. The vehicle seat includes a pair of side frames that are arranged on the side, and lower frames and that connect lower portions of the pair of side frames to each other, in which a narrow portion including: a horizontal portion formed inside the pair of side frames along a longitudinal direction with a flexibility against a load equal to or more than a predetermined impact load, and an inclined portion extending from the horizontal portion via a bent portion inside the pair of side frames is formed on the lower frames.

What is claimed is: 
     
         1 . A vehicle seat comprising:
 a pair of side frames that are arranged on the side; and   a lower frame that connect lower portions of the pair of side frames to each other,   wherein a narrow portion including: a horizontal portion formed inside the pair of side frames along a longitudinal direction with a flexibility against a load equal to or more than a predetermined impact load, and an inclined portion extending from the horizontal portion via a bent portion inside the pair of side frames is formed on the lower frame.   
     
     
         2 . The vehicle seat according to  claim 1 , wherein:
 the lower frame includes a pair of lower frame side portions arranged below the pair of side frames, and a lower frame center portion that connects the pair of lower frame side portions to each other;   the lower frame side portion includes a side plate joined to a side plate of the side frame, and an intermediate plate formed by being bent from an end portion of the side plate; and   the narrow portion is formed on the intermediate plate.   
     
     
         3 . The vehicle seat according to  claim 1 , wherein a harness attachment portion bulging toward a side opposite to a bulging direction of the narrow portion is formed below the bent portion. 
     
     
         4 . The vehicle seat according to  claim 2 , wherein the narrow portion is formed above the lower frame center portion. 
     
     
         5 . The vehicle seat according to  claim 1 , wherein a reinforcement portion that reinforces the lower frame is provided at a position displaced from the narrow portion in an up and down direction. 
     
     
         6 . The vehicle seat according to  claim 5 , wherein the reinforcement portion is provided below the narrow portion. 
     
     
         7 . The vehicle seat according to  claim 5 , wherein the reinforcement portion is provided at a position overlapping at least partially the narrow portion in a front to back direction. 
     
     
         8 . The vehicle seat according to  claim 1 , further comprising:
 a pressure receiving member that is connected to the pair of side frames via a connection member to support an occupant; and   an impact reducing member that is arranged at least on one of the side frames and is connected to the connection member, to move the pressure receiving member rearward by a predetermined impact load applied to the pressure receiving member.