Subframe structure of vehicle

1. A subframe structure at a lower front portion of a vehicle, the subframe structure comprising:

a load input portion arranged between a front end of a side frame and a bumper beam;

a load introducing portion extending rearwardly downward from the load input portion; and

a body portion extending rearward from the load introducing portion,

wherein the load input portion, the load introducing portion and the body portion are continuously provided, and wherein

the load input portion, the load introducing portion and the body portion are formed as a one-piece structure.

2. The subframe structure according to claim 1 , wherein at least one of the load input portion, the load introducing portion and the body portion is formed by hydroforming.

3. The subframe structure according to claim 2 , wherein the load input portion and the load introducing portion are formed by hydroforming.

4. The subframe structure according to claim 1 , wherein a vertical dimension of a contacting portion between the bumper beam and the load input portion is longer than half of a vertical distance between a lowermost portion of the side frame and an uppermost portion of the body portion at a front end of the side frame.

5. The subframe structure according to claim 1 , wherein the load input portion comprises:

a horizontal part having a rear surface which is in contact with a front end surface of the side frame; and

a vertical part having a front surface which is in contact with the bumper beam.

6. The subframe structure according to claim 1 , wherein cross-sectional shape of the load introducing portion is continuously varied.

7. The subframe structure according to claim 1 , wherein a central portion of the body portion in a longitudinal direction thereof is downwardly bent.

8. The subframe structure according to claim 1 , wherein the load introducing portion extends in a rearwardly downward direction of the vehicle from a lower end of a vertically extending portion of the load input portion.

9. The subframe structure according to claim 1 , wherein a rear end of the body portion is connected to an inclined portion of the side frame wherein the side frame is extended in a rearward direction of the vehicle.

10. The subframe structure according to claim 1 , wherein the bumper beam includes an attaching portion attached to a front, vertically extending surface of the load input portion of the subframe, and

the attaching portion has an upper surface which is substantially planar with an upper surface of the side frame and a lower surface which tapers rearwardly downwardly to have an increasingly larger vertical dimension.

11. The subframe structure according to claim 1 , wherein the body portion has a smaller vertical dimension than that of the side frame.

12. A subframe structure at a lower front portion of a vehicle, the subframe structure comprising:

a load input portion arranged between a front end of a side frame and a bumper beam;

a load introducing portion extending rearwardly downward from the load input portion;

a plurality of body portions extending rearward from the load introducing portion,

wherein the load input portion, the load introducing portion and the body portions are continuously provided,

a vertically extending transverse connecting member which connects the body portions of the subframe, and

wherein an upper surface of the side frame and the load input portion are substantially planar.

13. The subframe structure according to claim 12 , wherein the bumper beam includes an attaching portion attached to a front, vertically extending surface of the load input portion of the subframe, and

the attaching portion has an upper surface which is substantially planar with an upper surface of the side frame and a lower surface which tapers rearwardly downwardly to have an increasingly larger vertical dimension.