Bumper frame for vehicle and bumper

1 . A bumper frame for a vehicle, comprising:

a back beam extending in a width direction of the vehicle;

a first step bracket disposed in a center region of one surface of the back beam and provided in a structure protruding from the back beam;

a pair of second step brackets disposed in each side region of the one surface of the back beam and provided as structures protruding from the back beam in parallel with the first step bracket; and

a plurality of support brackets fastened and fixed to the one surface of the back beam, a first support bracket of the plurality of support brackets configured to support a lower portion of the first step bracket, and second support brackets of the plurality of support brackets configured to support a lower portion of the second step brackets,

wherein each of the plurality of support brackets is made of a hollow pipe member and formed in a shape of a circular or non-circular cross-section.

2 . The bumper frame of claim 1 , wherein each of the plurality of support brackets includes:

a first body disposed spaced apart from the back beam;

a pair of second bodies bent at both ends of the first body and extending toward the back beam; and

a third body bent at an end of each of the pair of second bodies and extending in a vertical direction along the one surface of the back beam, and

the first support bracket is configured to support the first step bracket through second bodies of the first support bracket and a first body of the first support bracket in a state in which a third body of the first support bracket is fixed to the one surface of the back beam,

the second support brackets are configured to support the second step brackets through second bodies of the second support brackets and first bodies of the second support brackets in a state in which third bodies of the second support brackets are fixed to the one surface of the back beam.

3 . The bumper frame of claim 2 , wherein the first body is disposed in a first direction, the second bodies are bent toward a second direction perpendicular to the first direction, and the third body has a structure bent toward a third direction perpendicular to each of the first direction and the second direction.

4 . The bumper frame of claim 2 , wherein, in the center region of the one surface of the back beam, the first support bracket is fixed so that an end of the third body of the first support bracket faces an upper surface of the back beam, and disposed so that the first body of the first support bracket and the second bodies of the first support bracket are located below a lower surface of the back beam, and

in the side regions of the one surface of the back beam, the second support brackets are fixed so that the end of the third bodies of the second support brackets faces the lower surface of the back beam, and disposed so that the first bodies and the second bodies of the second support brackets are located above the upper surface of the back beam.

5 . The bumper frame of claim 2 , wherein the first step bracket includes:

a vertical portion extending below the lower surface of the back beam along the one surface of the back beam; and

a horizontal portion bent at an end of the vertical portion and extending to an outer side of the back beam,

the vertical portion has an accommodation recess configured to accommodate the third body in a state in which an upper end is attached to the one surface of the back beam, and

the horizontal portion is supported with a lower surface being placed on the second bodies and the first body.

6 . The bumper frame of claim 2 , wherein the second step brackets are spaced apart from the back bream and supported with lower surfaces being placed on the second bodies and the first body.

7 . The bumper frame of claim 2 , further comprising: a reinforcing bracket having a structure bent along the second bodies and the third body and configured to support the second bodies and the third body in a state in which the reinforcing bracket is disposed in a rear side of the first step bracket and attached to the lower surface of the back beam and a lower surface of the first step bracket.

8 . The bumper frame of claim 2 , wherein the first support bracket comprises a pair of support brackets, and the first step bracket is configured to be supported by

a fastening bracket configured to integrally fasten and fix a pair of first bodies of the pair of support brackets is further mounted on a lower surface of the first step bracket in a state in which the pair of first bodies of the pair of support brackets are disposed parallel to each other on the lower portion of the first step bracket.

9 . The bumper frame of claim 1 , further comprising a third step bracket disposed on each of both side surfaces of the back beam and provided in a structure protruding from the back beam,

wherein the third step bracket is configured to be supported by a third support bracket of the plurality of support brackets fastened and fixed to each of the one surface of the back beam and the side surfaces of the back beam.

10 . A bumper of a vehicle, comprising:

a bumper frame mounted on a vehicle body; and

a bumper cover accommodating the bumper frame therein,

wherein the bumper frame includes: a back beam extending in a width direction of the vehicle;

a first step bracket disposed in a center region of one surface of the back beam and provided in a structure protruding from the back beam;

a pair of second step brackets disposed in each side region of the one surface of the back beam and provided in structures protruding from the back beam in parallel with the first step bracket; and

a plurality of support brackets fastened and fixed to the one surface of the back beam, a first support bracket of the plurality of support brackets configured to support a lower portion of the first step bracket, and second support brackets of the plurality of support brackets configured to support a lower portion of the second step brackets protruding from the back beam, and

each of the plurality of support brackets is made of a hollow pipe member and formed in a shape of a circular or non-circular cross-section.