TH1901002984A - Bumper beam with a figure 8 cross section - Google Patents

Abstract

DEPCT6313/08/2019 The present invention provides a buffer beam (i) made from at least one rolled steel plate (10) comprising an upper beam (12) and a lower beam (14) extending therefrom. in The transverse direction in which said upper beam (12) and said lower beam (14) each have a cross-section closed, which is bounded by the front wall (16,22), back wall (18,24), top wall (20) and The bottom wall (26) of which the top wall (20) and bottom wall (26) connect the front wall (16,22) to the back wall (18,24) with the middle wall (28) spanning out between the front wall (16,22) and the back wall (18, 24) of the top beam (12) and of the bottom beam (14), resulting in both the bottom wall of the top beam (12) and the side wall On the bottom beam (14), said center wall (28) extends in at least two different planes. DEPCT63 The present invention provides a buffer beam (1) made up of rolled steel sheets. Forming (10) at least one sheet comprising an upper beam (12) and a lower beam (14) extending into The transverse direction in which said upper beam (12) and said lower beam (14) each has a cross-section. Closed model, which is defined by the front wall (16,22), back wall (18,24), top wall (20) and bottom wall (26), where the top wall (20) and bottom wall (26 ) will connect the front wall (16,22) to the back wall (18,24), with the middle wall (28) extending between the front wall (16,22) and the back wall. (18,24) of the top beam (12) and of the bottom beam (14) create the entire bottom wall of the top beam. (12) and the upper wall of the lower beam (14), the said middle wall (28) extends in at least two different planes.

Claims (16)

1.DEPCT6313/08/2019 1. A bumper beam (i) for a motor vehicle, made up of at least one rolled steel plate (10), comprising a top beam (12) and a bottom beam (14) extending in a transverse direction, each of said top beam (12) and said bottom beam (14) having a closed cross-section bounded by a front wall (16,22), a rear wall (18,24), a top wall (20) and a bottom wall (26), wherein the top wall (20) and the bottom wall (26) connect the front wall (16,22) to the rear wall (18,24), wherein a central wall (28) extending between the front wall (16,22) and the rear walls (18,24) of the top beam (12) and of the bottom beam (14) forms both the bottom wall of the top beam (12) and the top wall of the bottom beam (14), wherein the central wall (28) extends in at least two different planes. The central wall (28) comprising a front portion (30) extending from the front walls (16,22) of the top and bottom beams (12,14), a rear portion (32) extending from the back walls (18,24) of the top and bottom beams (12,14), and a central portion (34) connecting the front portion (30) and the back portion (32), wherein the front portion (30) and/or the back portion (32) extend in a plane different from the plane to which the central portion (34) extends, and is characterized in such a way that the front portion (30) extends in a first plane and the back portion (32) extends in a second plane parallel to the first plane, wherein the central portion (34) extends in a third plane inclined between the first and second planes, the joint between the central portion (34) and the front portion (30), the back portion (32) respectively is formed by a rounded-edged portion (36) extending between the central portion (34) and the portion. 2. The bumper beam of claim 1, wherein the first and second planes are parallel to the top wall (20) of the top beam (12) and to the bottom wall (26) of the bottom beam (14); 3. The bumper beam of claims 1 or 2, wherein the front portion (30) extends to a first distance from the top wall (20) of the top beam (12), and the rear portion (32) extends to a second distance from the top wall (20) of the top beam (12), wherein the second distance is greater than the first distance; 4. The bumper beam of claim 3, wherein the difference between the first and second distances is less than One-third of the distance separating the top wall (20) of the top beam (12) from the bottom wall (26) of the bottom beam (14). 5. The bumper beam of any one of claims 1 to 4, wherein the front portion (30) is connected to the front wall (16) of the top beam (16) by a rounded front end (38), and wherein the back portion (32) is connected to the back wall (24) of the bottom beam (14) by a rounded back end (40). 6. The bumper beam of any one of claims 1 to 5, wherein the front walls (16, 22) of the top beam (12) and of the bottom beam (14) comprise a front member (46) extending transversely and to the inside of the bumper beam (1). 7. The bumper beam of claim 6, wherein at least one side of the top wall (20) of the beam The top (12), the bottom wall (26) of the bottom beam (14), the back wall (18) of the top beam (12), and the back wall (24) of the bottom beam (14) further comprise a subframe (48) extending transversely and toward the inside of the bumper beam (1). 8. The bumper beam of claim 7, wherein the back walls (18, 24) on each side of the top beam (12) and of the bottom beam (14) further comprise a back subframe (48) extending transversely and toward the inside of the bumper beam (1). 9. The bumper beam of any one of claims 1 to 8, wherein the steel plate (10) is of steel having a tensile strength greater than or equal to 980 Mpa. 10. The bumper beam of claim 9, wherein the steel plate (10) has an incorporated thickness. 11. The bumper beam of any one of claims 1 to 10, wherein the bumper beam (1) is curved in a transverse direction such that the radius of curvature of the bumper beam (1) is less than or equal to 4000 mm. 12. The bumper beam of any one of claims 1 to 11, wherein a steel plate (10) extends between a first edge (42) and a second edge (44), wherein the first edge (42) is welded to the front wall (16) of the top beam (12) and the second edge (44) is welded to the back wall (24) of the bottom beam (14). 13. The bumper beam of any one of claims 1 to 12, further comprising a strengthening element (52) made of steel plate, wherein said strengthening element (52) is attached to the top beam (12) and to the bottom beam (14) such that the strengthening element (52) extends opposite at least part of the wall. The fronts (16, 22) of said top beams (12) and of said bottom beams (14) and are bounded by said front walls (16, 22) wherein at least one cavity (54) extends between said front walls (16, 22) and said reinforcing member (52). 14. A method for producing a bumper beam (1) according to any one of claims 1 to 13, comprising the steps of: providing a steel sheet (10); rolling the steel sheet (10) in a continuous rolling station to form a bumper beam (1) comprising a top beam (12) and a bottom beam (14) extending in a transverse direction, wherein said top beam (12) and said bottom beam (14) each have a closed cross-section bounded by a front wall (16, 22), a back wall (18, 24), a top wall (20) and a bottom wall (26), wherein the top wall (20) and bottom wall (26) connect the front wall (16, 22) to the back wall. (18,24) wherein the central wall (28) extending between the front wall (16,22) and the back wall (18,24) of the top beam (12) and the bottom beam (14) shall form both the bottom wall of the top beam (12) and the top wall of the bottom beam (14), characterized in that the central wall (28) is so shaped that it extends in at least two different planes in at least one continuous rolling station. 15. The method of claim 14, further comprising the step of welding one edge (42) of the steel plate (10) to the front wall (16) of the top beam (12) and welding the other edge (44) of the steel plate (10) to the back wall (24) of the bottom beam (14). 16. The method of claims 14 or 15, wherein the steel plate (10) is made of steel having a tensile strength greater than or equal to 980 MPa DEPCT63 1. A bumper beam (1) for a motor vehicle, made of at least one rolled steel sheet (10), comprising a top beam (12) and a bottom beam (14) extending in a transverse direction, each of which has a closed cross-section bounded by a front wall (16, 22), a rear wall (18, 24), a top wall (20) and a bottom wall (26), wherein the top wall (20) and the bottom wall (26) connect the front wall (16, 22) to the rear wall (18, 24), wherein a central wall (28) extending between the front wall (16, 22) and the rear walls (18, 24) of the top beam (12) and of the bottom beam (14) forms both the bottom wall of the top beam (12) and the top wall of the bottom beam (14), wherein the central wall (28) extends in at least two different planes, wherein the central wall (28) comprising a front portion (30) extending from the front wall (16,22) of the top and bottom beams(12,14), the back portions(32) extending from the back walls(18,24) of the top and bottom beams(12,14), and the middle portion(34) connecting the front portion(30) and the back portion(32), wherein the front portion(30) and/or the back portion(32) extend in a plane different from the plane to which the middle portion(34) extends, which are characterized in such a way that the front portion(30) extends in a first plane and the back portion(32) extends in a second plane parallel to the first plane, wherein the middle portion(34) extends in a third plane inclined between the first and second planes, the joint between the middle portion(34) and the front portion(30), the back portion(32) respectively are formed by a rounded-edged portion(36) extending between the middle portion(34) and the front portions(30), the back portion(32) respectively, and In the sense that the radius of curvature of the part with rounded edges (36) is greater than or equal to 0.5 times the thickness of the steel plate (10). 2. The bumper beam of claim 1 wherein the first and second planes are parallel to the top wall (20) of the top beam (12) and to the bottom wall (26) of the bottom beam (14). 3. The bumper beam of claim 1 or 2, wherein the front portion (30) extends a first distance from the top wall (20) of the top beam (12), and the rear portion (32) extends a second distance from the top wall (20) of the top beam (12), the second distance being greater than the first distance. 4. The bumper beam of claim 3 wherein the difference between the first and second distances is less than the third distance separating the top wall (20) of the top beam (12) from the bottom wall (26) of the bottom beam (14). 5. The bumper beam of any one of claims 1 to 4, wherein the front portion (30) is connected to the front wall (16) of the top beam (16) by a front end having a rounded edge (38), and wherein the rear portion (32) is connected to the back wall (24) of the bottom beam (14) by a back end having a rounded edge (40). 6. The bumper beam of any one of claims 1 to 5, wherein the front wall (16, 22) on each side of the top beam (12) and of the bottom beam (14) comprises a front support frame (46) extending transversely and towards the inside of the bumper beam (1). 7. The bumper beam of claim 6, wherein at least one side of the top wall (20) of the top beam (12), the bottom wall (26) of the bottom beam (14), the back wall (18) of the top beam (12), and the back wall (24) of the bottom beam (14) further comprises a support frame (48) extending transversely and to the inside of the bumper beam (1). 8. The bumper beams of claim 7, wherein the rear walls (18, 24) on each side of the top beam (12) and of the bottom beam (14) comprise a rear support frame (48) extending transversely and towards the inside of the bumper beam (1). 9. The bumper beam of any one of claims 1 to 8, wherein the steel plate (10) is made of steel having a tensile strength greater than or equal to 980 Mpa. 10. The bumper beam of claim 9, wherein the steel plate (10) has a substantial thickness of 0.8 mm to 1.5 mm. 11. The bumper beam of any one of claims 1 to 10, wherein the bumper beam (1) is curved in a transverse direction such that the radius of curvature of the bumper beam (1) is less than or equal to 4000 mm. 12. The bumper beam of any one of claims 1 to 11, wherein the steel plate (10) extends between a first edge (42) and a second edge (44), wherein the first edge (42) is welded to the front wall (16) of the top beam (12) and the second edge (44) is welded to the back wall (24) of the bottom beam (14). 13. The bumper beam of any one of claims 1 to 12, further comprising a strengthening member (52) made of steel plate, wherein said strengthening member (52) is attached to the top beam (12) and to the bottom beam (14) such that the strengthening member (52) extends across at least a portion of the front wall (16, 22) of the top beam (12) and of the bottom beam (14) and is bounded by said front wall (16, 22) wherein at least one cavity (54) extends between said front wall (16, 22) and said strengthening member (52). 14. A method for producing a bumper beam (1) according to any one of claims 1 to 13, comprising the steps of: providing a steel sheet (10), rolling the steel sheet (10) in a continuous rolling station to form a bumper beam (1) comprising a top beam (12) and a bottom beam (14) extending in a transverse direction, wherein said top beam (12) and said bottom beam (14) each have a closed cross-section bounded by a front wall (16, 22), a back wall (18, 24), a top wall (20) and a bottom wall (26), wherein the top wall (20) and bottom wall (26) connect the front wall (16, 22) to the back wall. (18,24), a central wall (28) extending between the front walls (16,22) and the back walls (18,24) of the top beam (12) and of the bottom beam (14) such that both the bottom wall of the top beam (12) and the top wall of the bottom beam (14) are formed in the sense that the central wall (28) is so shaped that it extends in at least two different planes in at least one continuous rolling station. 15. The method of claim 14, further comprising the step of welding one edge (42) of the steel plate (10) to the front wall (16) of the top beam (12) and welding the other edge (44) of the steel plate (10) to the back wall (24) of the bottom beam (14). 16. The method according to claim 14 or 15, wherein the steel plate (10) is made of steel having a tensile strength greater than or equal to 980 MPa.