Vehicle front structure

1. A vehicle front structure comprising:

a front frame member of a vehicle;

a bumper beam disposed at a front section of the vehicle in a vehicle width direction;

a crush box fixed to a rear surface of the bumper beam and having a rear end portion coupled to a front end portion of the front frame member; and

a corner reinforcement member disposed at a corner portion formed between the rear surface of the bumper beam and a side surface of the crush box,

wherein an outer surface of the corner reinforcement member is joined in a state in which the outer surface abuts the rear surface of the bumper beam and the side surface of the crush box,

wherein the bumper beam has an opening formed at an end portion in the vehicle width direction,

wherein the opening is closed by a lid member,

wherein the lid member has an extension section extending toward an inside of the crush box, and

wherein the extension section is coupled to the front frame member together with the crush box.

2. The vehicle front structure according to claim 1 ,

wherein the corner reinforcement member is a member in which a horizontal cross section of the outer surface has a polygonal shape, and has at least an inclined wall extending to diagonally connect the rear surface of the bumper beam and the side surface of the crush box.

3. The vehicle front structure according to claim 2 ,

wherein the corner reinforcement member has a substantially triangular hollow cross section formed by a first sidewall joined to the rear surface of the bumper beam, a second sidewall joined to the side surface of the crush box, and the inclined wall configured to diagonally couple the first sidewall and the second sidewall,

wherein the first sidewall and the second sidewall are connected by an arc-shaped wall having a substantially arc-shaped cross section, and

wherein extension flanges are arranged at end portions of the first sidewall and the second sidewall that are opposite to the arc-shaped wall, the extension flanges being joined to the rear surface of the bumper beam and the side surface of the crush box.

4. The vehicle front structure according to claim 1 ,

wherein the bumper beam has a plurality of hollow sections having cross sections in forward, rearward, upward and downward directions of a vehicle body, which are partitioned by lateral walls, and

wherein the crush box has a plurality of hollow sections having cross sections in the vehicle width direction and the upward and downward directions, which are partitioned by longitudinal walls.

5. The vehicle front structure according to claim 2 ,

wherein the bumper beam has a plurality of hollow sections having cross sections in forward, rearward, upward and downward directions of a vehicle body, which are partitioned by lateral walls, and

wherein the crush box has a plurality of hollow sections having cross sections in the vehicle width direction and the upward and downward directions, which are partitioned by longitudinal walls.

6. The vehicle front structure according to claim 3 ,

wherein the bumper beam has a plurality of hollow sections having cross sections in forward, rearward, upward and downward directions of a vehicle body, which are partitioned by lateral walls, and

wherein the crush box has a plurality of hollow sections having cross sections in the vehicle width direction and the upward and downward directions, which are partitioned by longitudinal walls.

7. The vehicle front structure according to claim 1 ,

wherein a deformation allowable portion having a wave pattern shape is formed at the extension section of the lid member.

8. The vehicle front structure according to claim 1 ,

wherein the front frame member has a front side-frame extending forward from a front section of a vehicle compartment, and an auxiliary side-frame having a front end portion disposed outside of the front side-frame in the vehicle width direction,

wherein a fragile portion is formed at a position spaced apart from the front end portion of the side surface of the front side-frame,

wherein the crush box is coupled and bridged to the front end portion of the front side-frame and the front end portion of the auxiliary side-frame,

wherein a reinforcement block having a substantially triangular shape when seen from above is joined to the front end portion of the auxiliary side-frame, the rear surface of the bumper beam and the side surface of the front side-frame, and

wherein the reinforcement block has a load transmission wall diagonally extending from the front end portion of the auxiliary side-frame toward a vicinity of the fragile portion of the front side-frame.