JP5513085B2 - Energy absorbing beam for vehicle and door structure for vehicle - Google Patents

Description

  The present invention relates to a vehicle energy absorption beam and a vehicle door structure used for, for example, an automobile door impact beam.

  In general, a side door disposed on the side of a vehicle body is supported by the vehicle body by a plurality of hinges with front ends spaced apart from each other to open and close the door opening, and is kept closed by a door lock mechanism. Configure as follows.

  Such a side door has a door body in which a door inner panel on the vehicle compartment side and a door outer panel on the vehicle body outer side are arranged to face each other and the edges are coupled to each other, and the door is between the door inner panel and the door outer panel. Arrange a lock mechanism, window regulator, etc.

  Furthermore, as shown in Patent Document 1 and Patent Document 2, when receiving an impact load from the outside at the time of a side collision or the like for the purpose of ensuring the safety of the occupant, the deformation of the door body is reduced and the door body is As an impact energy absorption beam for reducing intrusion into a vehicle interior, there is one in which a cylindrical door impact beam made of a steel pipe or the like extending in a substantially front-rear direction is disposed between a door inner panel and a door outer panel.

  However, in order to improve the strength and energy absorption performance, such a cylindrical door impact beam requires an increase in the number and size expansion, that is, a large-diameter door impact beam. There is concern over an increase in the occupied space and weight.

  As countermeasures, for example, Patent Document 3 and Patent Document 4 propose a door impact beam that uses an extruded material of an aluminum alloy that is relatively lightweight and has a large degree of freedom in cross-sectional shape. The door impact beam disclosed in Patent Document 3 is composed of an aluminum alloy extruded material that is continuous in a closed cross-sectional shape in which a pair of waves are spanned between opposing flanges, and the waves facing the input load are arranged outside. Alternatively, buckling deformation at the time of input is controlled by bending or bending into a shape that is easily bent inward.

  Further, Patent Document 4 discloses a first method in which a plurality of waves, which are spaced apart from each other between an input surface to which a load is input due to a collision and a support surface facing the input surface, are separated from each other. By forming the closed cross-section portion and the second closed cross-section portion, and forming the waves facing the first closed cross-section portion and the second closed cross-section portion so as to protrude toward the other closed cross-section portion, when an impact load is input The deformation mode in which the middle portions of the waves are close to each other is brought into contact with each other, and the resistance against the deformation of the door impact beam is increased by increasing the resistance of the door impact beam.

JP-A-9-86178 JP 2002-316536 A JP 2003-118367 A JP 2007-55414 A

  As disclosed in Patent Document 1 and Patent Document 2 described above, the cylindrical door impact beam made of a steel pipe is increased in number and size, that is, a large-diameter door, in order to improve strength and energy absorption performance. Since an impact beam is required, there is a concern about an increase in the space occupied by the door impact beam in the door body and an increase in weight. In addition, the door impact beam made of a steel pipe requires heat treatment for improving the strength, which increases the manufacturing cost.

  In addition, the door impact beam made of an aluminum alloy extruded material disclosed in Patent Document 3 and Patent Document 4 can control the required strength and energy absorption performance relatively easily by changing the cross-sectional shape, and the inside of the door body. The space occupied by the door impact beam can be reduced.

  However, manufacturing of extruded materials made of aluminum alloy requires a lot of manufacturing costs, and extruded materials made of aluminum alloy are difficult to weld with door inner panels made of iron-based metal, and the door inner panel is connected via a bracket. Alternatively, since it is attached to the door inner panel by bolting, it is necessary to increase the number of work steps and to prevent electric corrosion between dissimilar metals of the door impact beam and the bracket, leading to an increase in manufacturing cost. Further, the impact energy absorbing beam is not limited to the door impact beam, but the same may occur in other parts of the vehicle such as a bumper beam.

  On the other hand, recently, automotive parts made of high-tensile steel (high-tensile steel), which is dramatically higher in strength, can be reduced in weight by being thinned, can be expected to reduce fuel consumption, and are easy to roll and weld with excellent productivity. Attention has been paid.

  Accordingly, an object of the present invention made in view of such a point is to provide a vehicle energy absorption beam and a vehicle door structure made of high-strength steel material that are excellent in strength, can be reduced in weight by being thinned, and are excellent in productivity. It is in.

The invention of the energy absorbing beam for a vehicle according to claim 1, which achieves the above object, includes a tension side surface portion and a compression side surface portion extending opposite to an impact load input direction, and between the tension side surface portion and the compression side surface portion. A plurality of closed cross-sections formed by a plurality of vertical wall portions erected on the vehicle extend in a direction intersecting the impact load input direction, and both ends are respectively supported by a vehicle body member. The beam is roll-formed using a thin plate made of a high-strength steel plate, and includes a base portion extending in a direction intersecting the impact load input direction and facing the impact load input direction in a cross-sectional shape, and one of the base portions A first tensile side surface extending from the edge opposite to the impact load input direction, and a first outer vertical wall extending from the end of the first tensile side surface by bending at an obtuse angle to the impact load input side , Of the first outer vertical wall The first compression side surface portion that is bent at an acute angle from the portion and faces the impact loading direction and extends in parallel to face the first tension side surface portion, and the impact from the end of the first compression side surface portion. A first inner vertical wall portion that is bent at a substantially right angle in a direction away from the load input side and extends along the impact load input direction, and an end portion of the first inner vertical wall portion is bent. A hollow trapezoidal first closed cross-sectional shape part having a first end face part connected to the base part, and an impact load extending from the other edge of the base part in a direction away from the first tensile side face part. A second tensile side wall facing the input direction; a second outer vertical wall extending from the end of the second tensile side to the impact load input side by bending at an obtuse angle; and the second outer vertical wall The second tension is bent at an acute angle from the end of the first end toward the first compression side face and opposed to the impact load input direction. A second compression side surface portion extending in parallel to face the surface portion; the first inner vertical wall portion bent at a substantially right angle in a direction away from the impact load input side from an end portion of the second compression side surface portion; A hollow trapezoidal shape in which a second inner vertical wall portion facing and extending in parallel and a second end surface portion which is bent at the end portion of the second inner vertical wall portion and joined to the base portion are continuous. A second closed cross-sectional shape part, and the first end face part and the second end face part are laminated on the surface of the base on the impact load input side and welded to the base part. To do.

According to this, the energy absorbing beam for a vehicle has a long and unequal length of the first compression side surface where the impact load is input to the first tensile side surface portion in the cross-sectional shape, and the first outer vertical wall portion is impacted. A hollow trapezoidal first closed cross-sectional shape portion that is inclined with respect to the load input direction, and similarly, the second compression side portion to which an impact load is input to the second tensile side portion is long and unequal. The second outer vertical wall portion has a hollow trapezoidal second closed cross-sectional shape portion inclined with respect to the impact load input direction, and the first inner vertical wall portion and the second inner vertical wall portion are in the impact load input direction. The first tension side surface portion that extends in parallel with the first closed cross-sectional shape portion and the second tensile side surface portion that forms the second closed cross-sectional shape portion are connected by the base, so that the first compression is performed. A first closed cross-sectional shape portion against an impact load input to the side surface portion and the second compression side surface portion; Drag deformation of 2 closed section portion is constrained to the input of the impact load can be ensured.
Further, when the impact load is applied, the first end surface portion and the second end surface portion are pressed against the base portion, and the first end surface portion and the second end surface portion are pressed against the base portion to prevent the welded portion from being peeled off. Sudden shape change and behavior of the first closed cross-sectional shape portion and the second closed cross-sectional shape portion are suppressed, the drag against the impact load is maintained, and the energy absorption can be executed more efficiently.

  Further, the first compression side surface portion that forms the first closed cross-sectional shape portion and the second compression side surface portion that forms the second closed cross-section shape portion by bending the bent portion of the first outer vertical wall portion at an acute angle in advance. And the bent portion of the second outer vertical wall portion is bent at an acute angle in advance, so that an excessive impact load is input and the first closed cross-section shape portion and the second closed cross-section shape portion are bent when deformed. The amount of bending deformation of the bent portion of the first compressed side surface portion and the first outer vertical wall portion and the bent portion of the second compressed side surface portion and the second outer vertical wall portion is suppressed, and breakage such as cracks in the portion is prevented. This avoids abrupt changes in the shape of the first closed cross-sectional shape portion and the second closed cross-sectional shape portion, maintains a stable resistance against an impact load, and ensures excellent energy absorption. In addition, a reduction in manufacturing cost of the energy absorbing beam can be expected in combination with a reduction in weight by thinning a high-tensile steel plate excellent in energy absorption and productivity, and a high-tensile steel plate having excellent welding workability.

  According to a second aspect of the present invention, in the vehicle energy absorbing beam according to the first aspect, an impact load is applied as the transition from the base portion to the first tensile side surface portion is performed between one edge of the base portion and the first tensile side surface portion. A first inclined wall portion gradually separating from the input direction is interposed, and the first inclined wall portion gradually departs from the impact load input direction as it moves from the base portion to the second tensile side surface portion between the other edge of the base portion and the second tensile side surface portion. Two inclined wall portions are interposed.

  According to this, a bent cross section that is continuous in the axial direction of the energy absorption beam with the first inclined wall portion interposed between the base portion and the first tensile side surface portion and the second inclined wall portion interposed between the base portion and the second tensile side surface portion. Since the shape is formed, the resistance against the impact load on the tension side of the energy absorbing beam is improved, and the first outer vertical wall portion, the first inner vertical wall portion, the second outer vertical wall portion, 2 The deformation of the inner vertical wall portion is stabilized, energy absorption is improved, and the operation of claim 1 can be executed more efficiently.

The invention for a vehicle door structure according to claim 3 that achieves the above object is characterized in that a front end and a rear end are provided in a door body provided with a door outer panel and a door inner panel for opening and closing a door opening of a vehicle body. In a vehicle door structure in which a door impact beam that is supported and extends in the front-rear direction along the door outer panel is disposed, the door impact beam is roll-formed using a thin plate made of a high-strength steel plate , A first tensile side surface extending in the front-rear direction along the outer panel and facing the door outer panel in a cross-sectional shape, and extending upward from an upper edge of the base, from an end of the first tensile side surface A first outer vertical wall portion that is bent and extends to the door outer panel side at an obtuse angle, and is bent downward at an acute angle from an end portion of the first outer vertical wall portion to face the door outer panel. A first compression side surface portion extending in parallel to face the first tension side surface portion, extending from an end portion of the first compression side surface portion at a substantially right angle in a horizontal direction away from the door outer panel side. A first closed section having a hollow trapezoidal shape and a first end face part that is bent at the end of the first inner vertical wall part and joined to the base part; A second tension side surface portion extending downward from the lower edge of the base portion, a second outer vertical wall portion extending from the end of the second tension side surface portion at an obtuse angle toward the door outer panel side, and the second outer side portion A second compression side surface that is bent upward at an acute angle from an end of the vertical wall portion and faces the door outer panel and extends parallel to the second tension side surface portion; Bend at a substantially right angle in the horizontal direction away from the door outer panel from the end, parallel to the first inner vertical wall. A second trapezoid-shaped second closed cross-sectional shape portion that is continuous with a second end surface portion that is bent and formed at the end portion of the second inner vertical wall portion and is joined to the base portion. Are integrally formed, and the first end surface portion and the second end surface portion are laminated on a surface of the base portion on the door outer panel side and welded to the base portion .

According to this, the door impact beam whose front end portion and rear end portion are supported by the door body and extends along the door outer panel is a door to the first tension side surface portion constituting the first closed cross-sectional shape portion in cross-sectional shape. The first compression side surface portion on the outer panel side is long and unequal, and the first inner vertical wall portion extends substantially horizontally, and the first outer vertical wall portion is inclined so as to rise as it moves to the door outer panel side. The second compression surface portion on the door outer panel side is short and unequal, and the second inner vertical wall portion is substantially horizontal with respect to the second tension side surface portion that has a hollow trapezoidal shape and similarly forms the second closed cross-sectional shape portion. And a second trapezoidal shape that has a hollow trapezoidal shape that inclines so as to descend as the second outer vertical wall portion moves toward the door outer panel side, and further includes a first tension side surface portion and a second Second tension side surface portion constituting the closed cross-sectional shape portion Since it is connected by the base portion, the deformation of the first closed cross-sectional shape portion and the second closed cross-sectional shape portion with respect to the impact load input to the first compression side surface portion and the second compression side surface portion is constrained and the impact load is input. Drag can be secured.
Further, when an impact load is applied, the first end surface portion and the second end surface portion are pressed against the base portion, the first end surface portion and the second end surface portion are pressed against the base portion, and peeling of the welded portion is prevented. Sudden shape change and behavior of the first closed cross-sectional shape portion and the second closed cross-sectional shape portion are suppressed, the drag against the impact load is maintained, and the energy absorption can be executed more efficiently.

Further, the first compression side surface portion that forms the first closed cross-sectional shape portion and the second compression side surface portion that forms the second closed cross-section shape portion by bending the bent portion of the first outer vertical wall portion at an acute angle in advance. Since the bent portion of the second outer vertical wall portion is bent at an acute angle in advance, an impact load is input from an excessive door outer panel and the first closed cross-sectional shape portion and the second closed cross-sectional shape portion are crushed and deformed. The amount of bending deformation of the bent portion of the first compressed side surface portion and the first outer vertical wall portion and the second compressed side surface portion and the second outer vertical wall portion which are bent at the time is suppressed, and cracks of the portions are suppressed. Can be avoided, and excellent energy absorption with respect to impact load can be secured. Furthermore, the door impact beam is excellent in energy absorption and productivity, and can be combined with a door inner panel or the like by weight reduction by welding with a high-strength steel plate, and improvement in productivity can be expected. Moreover, a door impact beam can be manufactured easily and inexpensively by forming a high-tensile steel plate by roll forming excellent in productivity.

The invention of claim 4 is the vehicle door structure according to claim 3, the door outer panel in accordance with the process proceeds to the first tension side portion from the base portion between the upper edge and the first tension side portion of the base portion A first inclined wall portion that gradually moves away is interposed, and a second inclined wall portion that gradually moves away from the door outer panel as it moves from the base portion to the second tensile side surface portion between the lower edge of the base portion and the second tensile side surface portion. It is characterized by intervening.

According to this, the first inclined wall portion is interposed between the base portion of the door impact beam and the first tensile side surface portion, and the second inclined wall portion is interposed between the base portion and the second tensile side surface portion in the axial direction of the door impact beam. Since the continuous bent cross-sectional shape is formed, the resistance against the impact load on the tension side of the door impact beam is improved, and the first outer vertical wall portion, the first inner vertical wall portion, and the second outer vertical wall against the impact load are obtained. The deformation of the wall portion and the second inner vertical wall portion is stabilized, energy absorption is improved, and the effect of claim 3 can be executed more efficiently.

  According to the present invention, the energy absorbing beam for a vehicle or the door impact beam is deformed in the first closed cross-sectional shape portion and the second closed cross-sectional shape portion with respect to an impact load input to the first compression side surface portion and the second compression side surface portion. Restrained to ensure resistance to impact load. Further, the first compression side surface portion that forms the first closed cross-sectional shape portion and the second compression side surface portion that forms the second closed cross-section shape portion by bending the bent portion of the first outer vertical wall portion at an acute angle in advance. And the bent portion of the second outer vertical wall portion is bent at an acute angle in advance, so that the first closed cross-section shape portion and the second closed cross-section shape portion are bent and deformed when an excessive impact load is input. The amount of bending deformation of the bent portion of the first compressed side surface portion and the first outer vertical wall portion and the bent portion of the second compressed side surface portion and the second outer vertical wall portion is suppressed, and breakage such as cracks in the portion is prevented. It is avoided, and excellent energy absorption with respect to impact load can be secured. In addition, a reduction in manufacturing cost of the energy absorbing beam can be expected in combination with a reduction in weight by thinning a high-tensile steel plate excellent in energy absorption and productivity, and a high-tensile steel plate having excellent welding workability.

It is a side view of the motor vehicle provided with the front side door which has a door impact beam in this Embodiment. It is the II sectional view taken on the line of FIG. It is the II-II sectional view taken on the line of FIG. It is the A section exploded perspective view of FIG. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. It is an operation explanatory view of a door impact beam, (a) is a sectional view of a door impact beam in a normal state before crushing, and (b) to (d) are sectional views of the door impact beam in a crushing deformation process. It is operation | movement explanatory drawing of the door impact beam in a comparative example, (a) is sectional drawing of the door impact beam in the normal state before crushing, (b) is sectional drawing of the door impact beam after crushing deformation. It is a figure which shows the coupling | bonding of the front-end part of a door impact beam and a door inner panel, (a) is principal part sectional drawing, (b) is a B arrow directional view of (a). It is a figure which shows the coupling | bonding of the front-end part of a door impact beam, and a door inner panel, (a) is principal part sectional drawing, (b) is C arrow directional view of (a).

  In the following, an embodiment of a vehicle energy absorbing beam and a vehicle door structure according to the present invention will be described with reference to an example in which the vehicle energy absorbing beam is a door impact beam and the door impact beam is disposed on the front side door. This will be described with reference to FIG. In the figure, arrow F indicates the front direction of the vehicle body, arrow OUT indicates the outward direction, and arrow UP indicates the upward direction.

  FIG. 1 is a side view of an automobile provided with a front side door 10 having a door impact beam 20 in the present embodiment, FIG. 2 is a cross-sectional view taken along line II in FIG. 1, and FIG. It is II sectional view.

  On the left and right sides of the vehicle body 1, a side sill 2 that extends in the front-rear direction along the lower part of the vehicle compartment, a side rail 3 that extends in the front-rear direction along the upper part of the vehicle case, and a vertical extension The front pillar 4 connects the front end of the side sill 2 and the front end of the side rail 3, and the rear pillar 5 extends in the vertical direction and connects the rear end of the side sill 2 and the rear end of the side rail 3. These are provided with a center pillar 6 that extends in the vertical direction between the front pillar 4 and the rear pillar 5 and connects the side sill 2 and the side rail 3. A door opening 7 for the front side door 10 and a door opening 8 for the rear side door 9 are formed between the front pillar 4 and the center pillar 6 and between the center pillar 6 and the rear pillar 5 respectively. . The left and right side sills 2 are connected by a floor panel, and a roof panel is disposed between the left and right side rails 3.

  The front side door 10 is a door in which the door outer panel 12 on the outer side of the vehicle body and the door inner panel 13 on the vehicle compartment side are arranged opposite to each other and the peripheral edges are coupled to each other as shown in FIG. It has a main body 11, and the front part of the door main body 11 is supported on a front pillar 4 that constitutes the front edge part of the door opening 7 with excellent rigidity and strength by a pair of upper and lower hinges (not shown), and can be opened and closed. The center pillar 6 is held in a closed state by a door lock mechanism (not shown) provided in the vicinity.

  The door inner panel 13 of the door main body 11 includes a front portion 15 extending from the front end of the inner side surface portion 14 facing the door outer panel 12 to the door outer panel 12 side through the front bent portion 14a and an outer end 15a of the front portion 15. The front flat portion 16 that is bent from the front and faces the door outer panel 12 is continuously formed, and the front end of the front flat portion 16 is coupled to the front end edge 12a of the door outer panel 12 through the stepped portion.

  On the other hand, the rear portion of the door inner panel 13 is bent from the rear surface portion 17 extending from the rear end of the inner side surface portion 14 to the door outer panel 12 side via the rear bent portion 14b and the outer end 17a of the rear surface portion 17. The rear flat portion 18 facing the outer panel 12 is continuously formed, and the outer end of the rear end portion 19 that is bent from the rear end 18a of the rear flat portion 18 and extends toward the door outer panel 12 is the rear end of the door outer panel 12. Join to edge 12b. Further, the lower end of the door inner panel 13 is bent from the lower end of the inner side surface portion 14, and the outer end of the lower surface portion extending to the door outer panel 12 side is coupled to the lower end edge of the door outer panel 12. Note that a work hole 14c for attaching and inspecting a door lock mechanism, a window regulator, and the like disposed in the door main body 11 is formed in the inner side surface portion 14 of the door inner panel 14.

  When the door main body 11 is in the closed state, the front surface portion 15 and the front flat portion 16 of the door inner panel 13 face the rear surface 4a and the outer surface 4b of the front pillar 4 with a gap therebetween, respectively, and the rear surface portion 17 and the rear flat portion 18 Are opposed to the front surface 6a and the outer surface 6b of the center pillar 6 with a gap therebetween and cover the front and rear edges of the door opening 7.

  In the space S in the door body 11 formed by the door outer panel 12 and the door inner panel 13, the front beam bracket 41 and the rear beam bracket 45 provide a space between the front flat portion 16 and the rear flat portion 18 of the door inner panel 13. A door impact beam 20 made of a high strength steel plate extending in the front-rear direction along the door outer panel 12 is installed. In this space S, other parts such as window glass, a door lock mechanism, and a window regulator (not shown) are provided. However, since these are not directly related to the present invention, description thereof is omitted.

  The door impact beam 20 has a base portion 21 that extends in the vertical direction facing the door outer panel 12 in a cross-sectional shape, as shown in a cross-sectional view taken along line II-II in FIG. A first inclined wall portion 23 that is inclined so as to be separated from the door outer panel 12 as it is bent and raised from the upper edge 21a that is one edge of the base portion 21, and is bent at an obtuse angle from the upper edge of the first inclined wall portion 23. A first back wall portion 24 serving as a first pulling side surface portion extending upward through a bent portion 23a to be bent, and a fold bent toward the door outer panel 12 at an obtuse angle α from the upper end of the first back wall portion 24. From the first outer vertical wall portion 25 extending obliquely so as to gradually rise as it moves to the door outer panel 12 side via the curved portion 24a, and from the end portion of the first outer vertical side wall portion 25 on the door outer panel 12 side. A first front wall that extends downward via a bent portion 25a that is bent downward at an acute angle β and that is parallel to the first back wall portion 24 and that serves as a first compression sidewall surface portion that faces the door outer panel 12. Portion 26 and lower end of first front wall portion 26 A first inner vertical wall portion 27 extending substantially horizontally and separated from the door outer panel 12 via a bent portion 26a that bends at a substantially right angle from the lower end at a substantially right angle to the end of the first inner vertical wall portion 27. A first end surface portion 28 that is joined to the outer surface of the base portion 21, that is, the surface on the side facing the door outer panel 12, is integrally formed continuously through a bent portion 27 a that is bent in a straight line.

  The first inclined wall portion 23, the first back wall portion 24, the first outer vertical wall portion 25, the first front wall portion 26, the first inner vertical wall portion 27, and the base portion 21 that are continuous with the upper edge 21 a of the base portion 21. A first front wall portion 26 that is opposed to the door outer panel 12 and a first back wall portion 24 that is shorter than the first front wall portion 26 in the vertical direction are provided by a first end surface portion 28 coupled to the outer surface. As the angle between the upper end of the first wall and the upper end of the first back wall 24 and the first front wall 26 changes from the first front wall 26 side to the first back wall 24 side with an acute angle β. The first outer vertical wall portion 25 that descends, the first inner vertical wall portion 27 and the first inclined wall portion that are installed between the lower end portion of the first front wall portion 26 and the lower end portion of the first back wall portion 24. A hollow trapezoidal first closed cross-sectional shape portion 22 is formed.

  Similarly, the second inclined wall portion 33 is inclined so as to be separated from the door outer panel 12 as it is bent and lowered from the lower edge 21 b of the base portion 21, and the bent portion is bent at an obtuse angle from the lower edge of the second inclined wall portion 33. A second back wall portion 34 serving as a second tension side surface portion extending downward via the bent portion 33a, and a bent portion 34a bent from the lower end of the second back wall portion 34 toward the door outer panel 12 at an obtuse angle α. Through the door outer panel 12 side, the second outer vertical wall portion 35 that inclines and extends so as to gradually descend, and an acute angle β from the end portion of the second outer vertical wall portion 35 on the door outer panel 12 side. A second front wall portion 36 that extends upward via a bent portion 35a that bends upward, faces the second back wall portion 34 in parallel, and serves as a second compression side surface facing the door outer panel 12; Fold at a substantially right angle from the upper end of the second front wall 36 A second inner vertical wall portion 37 extending in a substantially horizontal direction that is separated from the door outer panel 12 through a bent portion 36a that bends, and an end portion of the second inner vertical wall portion 37 is bent upward at a substantially right angle. A second end surface portion 38 coupled to the outer surface of the base portion 21 through the bent portion 37a is integrally formed continuously.

  A second inclined wall portion 33, a second back wall portion 34, a second outer vertical wall portion 35, a second front wall portion 36, and a second inner vertical wall portion that are continuous with the lower edge 21 a that is the other edge of the base portion 21. 37 and a second end surface portion 38 coupled to the outer surface of the base portion 21, and a second front wall portion 36 facing the door outer panel 12 and a second back wall portion 34 that is shorter than the second front wall portion 36 in the vertical direction. 2 The angle formed between the lower end portion of the front wall portion 36 and the lower end portion of the second back wall portion 34 and the second front wall portion 36 is an acute angle β from the second front wall portion 36 side to the second back wall portion 34. A second outer vertical wall portion 35 that rises as it moves to the side, a second inner vertical wall portion 37 that is constructed between the upper end portion of the second front wall portion 36 and the upper end portion of the second back wall portion 34, and A hollow trapezoidal second closed cross-sectional shape portion 32 including the second inclined wall portion 33 is formed.

  The hollow trapezoidal first closed cross-section shape portion 22 and the second closed cross-section shape portion 32 are vertically symmetrical about the beam center line L that is the center in the vertical direction of the base portion 21, and the first closed cross-section shape portion 22. The first inner vertical wall portion 27 and the second inner vertical wall portion 37 of the second closed cross-sectional shape portion 32 face each other substantially in parallel and extend in the horizontal direction, and the first front wall portion 26 and the second front wall portion. 36 is arranged substantially flush and faces the door outer panel 12, and the first outer vertical wall portion 25 and the second outer vertical wall portion 35 are inclined to face each other as they move to the door outer panel 12 side, The door of the base 21 with the first back wall portion 24 and the second back wall portion 34 being substantially flush with each other and with the edges 28a and 38a of the first end surface portion 28 and the second end surface portion 38 being close to or in contact with each other. It is laminated on the surface facing the outer panel 12 and extends along the edges 28a and 38a. Is Project welded to the base 21 Te.

  The door impact beam 20 in which the first closed cross-sectional shape portion 22 and the second closed cross-sectional shape portion 32 are continuously formed can be easily formed by, for example, forming a thin plate made of a high-strength steel plate having a thickness of about 1.6 mm by existing roll forming. Can be manufactured at low cost.

  4, the front end portion 20a of the door impact beam 20 is cut off at the ends of the first front wall portion 26 and the second front wall portion 36, which will be described later. An electrode insertion opening 29 for spot welding is formed. Similarly, although not shown in the figure, also in the rear end portion 20b of the door impact beam 20, the end portions of the first front wall portion 26 and the second front wall portion 36 are cut out to form an electrode insertion opening.

  The front beam bracket 41 for connecting the front end portion 20a of the door impact beam 20 to the front flat portion 16 of the door inner panel 13 has a front portion as shown in FIG. 4 and FIG. A flat base portion 42 that can be superposed on the flat portion 16, and a bottom surface portion 43A and a bottom surface portion 43A that are continuously formed on the base portion 42 so that the first back wall portion 24 and the second back wall portion 34 of the door impact beam 20 can be superposed. The first extending portion 43B extends in a U-shaped cross section having a first extending portion 43B and a second extending portion 43C that are bent and extended from the upper edge and the lower edge to the door outer panel 12 side, respectively. The impact beam mounting portion 43 in which the reinforcing flanges 43Ba and 43Ca are bent is integrally formed along the edge portion of the second extending portion 43C. The front beam bracket 41 can be easily and inexpensively manufactured by press-forming an iron-based steel plate and can be welded to the front end portion 20a of the door impact beam 20.

  The front end portion 20a of the door impact beam 20 is inserted between the first extending portion 43B and the second extending portion 43C of the impact beam mounting portion 43 of the front beam bracket 41 configured as described above, and the first back wall portion 24 is inserted. The second back wall 34 is brought into contact with the bottom surface 43A and fitted into the impact beam mounting portion 43 so that the door impact beam 20 and the front beam bracket 41 are relatively positioned, and in this positioned state, FIG. The electrode W of the spot welder is inserted into the first closed cross-section portion 22 and the second closed cross-section portion 32 from the electrode insertion opening 29 formed by cutting out the front end portion 20a of the door impact beam 20 as indicated by an imaginary line. Then, spot welding is performed between the first back wall portion 24 and the bottom surface portion 43A, and between the second back wall portion 34 and the bottom surface portion 43A, and a front bee is formed on the front end portion 20a of the door impact beam 20. Combining the bracket 41.

  On the other hand, the rear beam bracket 45 is a flat surface on which the first back wall portion 24 and the second back wall portion 34 of the door impact beam 20 can be overlapped, as shown in FIG. The impact beam mounting portion 46 and the impact beam mounting portion 46 extend in a U-shaped cross-section having a first extending portion 47A and a second extending portion 47B formed by bending toward the door inner panel 13 from both upper and lower ends. Then, attachment portions 48A and 48B that can overlap the rear flat portion 18 of the door inner panel 13 are bent and formed at the edges of the first extending portion 47A and the second extending portion 47B. The rear beam bracket 45 can be easily and inexpensively manufactured by press forming an iron-based steel plate.

  The door impact beam 20 and the rear beam bracket 45 are positioned relative to each other by overlapping the rear end portion 20b of the door impact beam 20 on the impact beam mounting portion 46 of the rear beam bracket 45 thus configured. In this state, as shown by phantom lines in FIG. 6, the electrode of the spot welder is moved from the opening for electrode insertion formed in the rear end portion 20 b of the door impact beam 20 to the first closed cross-sectional shape portion 22 and the second closed portion. A rear end portion 20b of the door impact beam 20 is inserted into the cross-sectional shape portion 32 and spot welded between the first back wall portion 24 and the impact beam mounting portion 46 and between the second back wall portion 34 and the impact beam mounting portion 46. The rear beam bracket 45 is coupled to the rear.

  The base portion 42 of the front beam bracket 41 coupled to the front end portion 20a of the door impact beam 20 is positioned so as to overlap the front flat portion 16 of the door inner panel 13, and similarly coupled to the rear end portion 20b of the door impact beam 20. Further, the mounting portions 48A and 48B of the rear beam bracket 45 are positioned so as to overlap the rear flat portion 18, and the door impact beam 20 is spanned between the front flat portion 16 and the rear flat portion 18 of the door inner panel 13. The relative position of the door inner panel 13 and the door impact beam 20 is determined. The base portion 42 of the front beam bracket 41 and the front flat portion 16 of the door inner panel 13 that are overlapped with each other in this relative positioning state are spot welded, and the mounting portions 48A and 48B of the rear impact bracket 45 are spot welded. Then, the door impact beam 20 is attached to the door inner panel 13.

  As shown in FIGS. 1 and 2, the door impact beam 21 arranged in the door body 11 in this way has the first front wall portion 26 and the second front wall portion 36 facing the door outer panel 12, and the door outer panel 12. And the front end portion 20a is inclined to the rear lowering state where the front end portion 20a is at the height of the chest of the occupant seated on the seat and the rear end portion 20b is located at the thigh height.

  Further, the first front wall portion 26 and the second front wall portion 36 that form the first closed cross-sectional shape portion 22 and the second closed cross-sectional shape portion 32 face the door outer panel 12 and input direction of an impact load P described later. The first inner vertical wall portion 27 and the second inner vertical wall portion 37 that are arranged vertically perpendicular to each other and face each other extend along the impact load input direction substantially parallel to the impact load input direction, and the first The outer vertical wall portion 25 is inclined so as to descend with respect to the impact load input direction as the first front wall portion 26 side is shifted to the first rear wall portion 24 side, and the second outer vertical wall portion 35 is the second front surface. As it moves from the wall 36 side to the second back wall 34 side, it is arranged so as to be inclined with respect to the impact load input direction.

  Next, the operation of the vehicle front door structure configured as described above will be described with reference to FIGS.

  FIG. 7 is an explanatory view of the operation of the door impact beam 20. FIG. 7A shows a cross-sectional shape of the door impact beam 20 in a normal state before the crushing deformation similar to FIG. 3, and FIGS. The cross-sectional shape of the door impact beam 20 in the process is shown.

  When the front door 10 is closed and an impact load P is input to the door body 11 from the side of the vehicle body due to a side collision or the like, the impact load P is applied via the door outer panel 12 as shown in FIGS. And input to the first front wall portion 26 and the second front wall portion 36 of the door impact beam 20 facing the door outer panel 12.

  At this time, the side of the door impact beam 20 whose front end portion 20a and rear end portion 20b are supported by the door body 11 via the front beam bracket 41, the rear beam bracket 45, etc. is slightly curved and is opposed to the door outer panel 12. The first back wall on the side away from the door outer panel 12 when compressive force is generated on the first front wall portion 26 and the second front wall portion 36 side of the first closed cross-section shape portion 22 and the second closed cross-section shape portion 32. Tensile force is generated on the portion 26, the second back wall portion 36, and the base portion 21 side.

  Here, in the door impact beam 20, the first front wall portion 26 into which the impact load P is input to the first back wall portion 24 constituting the first closed cross-section shape portion 22 in the cross-sectional shape is long and unequal. The first inner vertical wall portion 24 is parallel to the input direction of the impact load P and the first outer vertical wall portion 25 is inclined so as to descend as the distance from the door outer panel 12 increases with respect to the input direction of the impact load P. It has a trapezoidal shape, and the deformation of the first closed cross-sectional shape portion 22 with respect to the input of the impact load P is constrained. Similarly, the second front wall portion 36 to which the impact load P is input to the second back wall portion 34 constituting the second closed cross-sectional shape portion 32 is long and unequal, and the second inner vertical wall portion 34 is It has a hollow trapezoidal cross-sectional shape that is parallel to the input direction of the impact load P and is inclined so as to rise as the second outer vertical wall portion 35 moves away from the door outer panel 12 with respect to the input direction of the impact load P. The deformation of the second closed cross-sectional shape portion 32 with respect to the input of the impact load P is restrained. Further, the first back wall portion 24 of the first closed cross-section shape portion 22 and the second back wall portion 34 of the second closed cross-section shape portion 32 are connected via the base portion 21 and the like, so 2. The relative displacement of the closed cross-section portion 32 is constrained, and the first inclined wall portion 23 and the second inclined wall between the base portion 21 and the second back wall portion 34 are between the base portion 21 and the first back wall portion 24. Combined with the fact that the section 33 is interposed to form a bent cross-sectional shape continuous in the axial direction of the door impact beam 20 and the rigidity of the door impact beam 20 with respect to the impact load is secured, the door impact beam with respect to the impact load P The deformation of 20 is suppressed and the drag is secured.

  As a result, the impact load P input to the door impact beam 20 is reliably dispersed by the rigid door impact beam 20, and a part of the impact load P is joined to the front end 20a of the door impact beam 20. While being transmitted to the front pillar 4 via 41 and the hinge, it is distributed and transmitted to the center pillar 6 via the rear end portion 20b of the door impact beam 20 and a lock mechanism.

  When an excessive impact load P is input to the door body 11 from the outside, the load is transmitted from the door outer panel 12 to the door impact beam 20 through the first front wall portion 26 and the second front portion 36 as described above. Then, it is dispersed by the door impact beam 20 and transmitted to the front pillar 4 and the center pillar 6 and the like.

  Here, when the first front wall portion 26 is crushed by the impact load P input to the first front wall portion 26 of the door impact beam 20 and slightly displaced toward the first back wall portion 24, FIG. As shown in FIG. 4, the dispersion is transmitted from the first front wall portion 26 to the first inner vertical wall portion 27 extending along the impact load input direction and the first outer vertical wall portion 25 extending obliquely with respect to the load input direction. Thus, the first inner vertical wall portion 27 extending along the impact load input direction is crushed or deformed. On the other hand, the bent portion 25a formed by the first front wall portion 26 and the first outer vertical wall portion 25 is separated upward from the beam center line L with the inclination of the first outer vertical wall portion 25 with respect to the impact load input direction. The first front wall is displaced by being pushed, and the first outer vertical wall 25 swings about the bent portion 24a of the first back wall 24 on the pulling side as a fulcrum and further tilts with respect to the direction of impact load input. The bent portion 25a formed at an acute angle β by the portion 26 and the first outer vertical wall portion 25 is further bent and deformed at an acute angle, and is formed at an obtuse angle α by the first back wall portion 24 and the first outer vertical wall portion 25. The bent portion 24a is further bent and deformed to an obtuse angle, and the first closed cross-sectional shape portion 22 is sequentially flattened as shown in (c) and (d).

  Similarly, in the second closed cross-sectional shape portion 32, the second inner vertical wall portion 37 that extends from the second front wall portion 36 along the load input direction and the inclined load input direction extend. The second inner vertical wall portion 37 that is distributed and transmitted to the second outer vertical wall portion 35 and extends along the load input direction is crushed or deformed. On the other hand, the bent portion 35a formed by the second front wall portion 36 and the second outer vertical wall portion 35 is separated downward from the beam center line L with the inclination of the second outer vertical wall portion 35 with respect to the impact load input direction. The second front wall is pushed and displaced, and the second outer vertical wall 35 swings with the bent portion 34a of the second rear wall 34 on the tension side as a fulcrum and further tilts with respect to the direction of impact load input. The bent portion 35a formed at the acute angle β by the portion 36 and the second outer vertical wall portion 35 is further bent and deformed at an acute angle, and is formed at the obtuse angle α by the second back wall portion 34 and the second outer vertical wall portion 35. The bent portion 34a is further bent and deformed at an obtuse angle, and the second closed cross-sectional shape portion 32 is sequentially deformed into a flat shape as shown in (c) and (d).

  When the first closed cross-sectional shape portion 22 and the second closed cross-sectional shape portion 32 are deformed in accordance with the input of the impact load P, the first inner longitudinal length constituting the first closed cross-sectional shape portion 22 and the second closed cross-sectional shape portion 32 is formed. The wall 27 and the second inner vertical wall 37 extend in the cross-sectional shape along the input direction of the impact load P to obtain a resistance against the impact load P, and the impact load P is applied to the first back wall 24. The input first front wall 26 is long, the first inner vertical wall 24 is parallel to the input direction of the impact load P, and the first outer vertical wall 25 is inclined with respect to the input direction of the impact load P. A second front wall portion having a hollow trapezoidal cross-sectional shape, in which deformation of the first closed cross-sectional shape portion 22 with respect to the input of the impact load P is constrained, and similarly, the impact load P is input to the second back wall portion 34. 36 is long and unequal, and the second inner vertical wall 34 is in the input direction of the impact load P. The second outer vertical wall portion 35 is parallel and has a hollow trapezoidal cross-sectional shape that is inclined with respect to the input direction of the impact load P, and deformation of the first closed cross-sectional shape portion 22 with respect to the input of the impact load P is restrained. Furthermore, the first back wall portion 24 of the first closed cross-section shape portion 22 and the second back wall portion 34 of the second closed cross-section shape portion 32 are connected via the base portion 21 and the like, and the first closed cross-section shape portion 22 The relative displacement of the second closed cross-sectional shape portion 32 is constrained, the deformation of the door impact beam 20 with respect to the impact load P is suppressed, and the drag is secured.

  Further, the bent portion 25a of the first front wall portion 26 and the first outer vertical wall portion 25 and the bent portion 35a of the second front wall portion 36 and the second outer vertical wall portion 35 are previously bent at an acute angle β. In addition, the amount of bending deformation of the bent portions 25a and 35a accompanying the deformation of the first closed cross-section shape portion 22 and the second closed cross-section shape portion 32 is suppressed, and breakage such as cracks is avoided. 24 and the bent portion 24a of the first outer vertical wall portion 25 and the second back wall portion 34 and the bent portion 34a of the second outer vertical wall portion 35 are bent in advance at an obtuse angle α, and the first closed cross-sectional shape portion The amount of bending deformation of the bent portions 24a and 34a accompanying the deformation of the 22 and the second closed cross-sectional shape portion 32 is suppressed, breakage such as cracks is avoided, and excellent energy absorption with respect to impact load can be ensured.

  Further, the surface on the door outer panel 12 side serving as the impact load input side of the base portion 21 in a state where the end edge 28a of the first end surface portion 28 of the door impact beam 20 and the end edge 38a of the second end surface portion 38 are close to or in contact with each other. Since the first end surface portion 28 is welded to the base portion 21 and the second end surface portion 38 is welded to the base portion 21, when the impact load P is applied, the first end surface portion 28 and the second end surface portion 38 are the base portions. 21, the first end surface portion 28 and the second end surface portion 38 are pressed against the base portion 21, and the end edge 28 a of the first end surface portion 28 and the end edge 38 a of the second end surface portion 38 are pressed against each other. Relative movement of the first end surface portion 28 and the second end surface portion 38 with respect to the base portion 21 is suppressed, and peeling of the welded portion is prevented, and a sudden shape change of the first closed cross-section shape portion 22 and the second closed cross-section shape portion 32 and The behavior is suppressed, and the Is maintained drag impact beam 20, the energy absorbing properties can be performed more efficiently.

  As the drag of the door impact beam 20 increases, the impact load P input to the door impact beam 20 is reliably dispersed by the door impact beam 20 so that a part of the impact load P is the front end 20a of the door impact beam 20. Is transmitted to the front pillar 4 via the front beam bracket 41 and the hinge to which the door is coupled, while being distributed and transmitted to the center pillar 6 via the rear end portion 20b of the door impact beam 20 and a lock mechanism. Bending deformation is suppressed. The impact energy absorption performance is improved by suppressing the bending deformation of the door impact beam 20, and the bending of the door body 11 accompanying the suppression of the bending deformation of the door impact beam 20 is suppressed, so that the vehicle interior of the door body 11 is suppressed. Intrusion can be effectively prevented, and the influence on the occupant can be avoided or reduced, thereby improving safety.

  FIG. 8 is an explanatory diagram of the operation of the door impact beam 50 in the comparative example compared with the impact energy absorption performance by the door impact beam 20 in the present embodiment. FIG. 8A shows the sectional shape of the door impact beam 50, and FIG. 8B shows the sectional shape of the door impact beam 50 after crushing deformation. For convenience of explanation, portions corresponding to the door impact beam 20 in the present embodiment are denoted by the same reference numerals.

  As shown in FIG. 8 (a), a first inner vertical wall portion 27 that has a base portion 21 extending in the vertical direction in a cross-sectional shape and is bent at a substantially right angle from the upper edge of the base portion 21; A first front wall portion 26 extending upward through a bent portion that bends at a substantially right angle from an edge of the first inner vertical wall portion 27, and a substantially right angle from the upper end edge of the first front wall portion 26. A first outer vertical wall portion 25 extending in parallel with the first inner vertical wall portion 27 via a bent portion 25a that bends to the first outer vertical wall portion 25, and the first outer vertical wall portion 25 is bent at a substantially right angle. The first back wall 24 and the first back wall 24 that extend downward through the bent portion 24a and face the first front wall 26 in parallel are continuously formed on the impact load input side of the base 21. A first end surface portion 28 joined to the surface on the opposite side is continuously formed integrally, and the first inner vertical wall portion 27 and the first outer vertical wall portion 25 facing each other are of equal length and the first front wall portion. 6 and the first rear wall portion 24 forms a first closed cross section portion 22 of generally rectangular equal length.

  Similarly, the second inner vertical wall portion 37 is bent and extended from the lower edge of the base portion 21 at a substantially right angle, and the bent portion is bent at a substantially right angle from the edge of the second inner vertical wall portion 37. The second front wall portion 36 extends downward and the second inner wall portion 37 extends in parallel with the second inner vertical wall portion 37 through a bent portion 35a that is bent at a substantially right angle from the lower end edge of the second front wall portion 36. The second outer vertical wall 35 and the second outer vertical wall 35, which extends upward through a bent portion 24 a that is bent at a substantially right angle, are parallel to the second front wall 36. The second back wall portion 34 facing the second back wall portion 34 and the second end surface portion 38 connected to the base portion 21 are continuously formed integrally and opposed to the second inner vertical wall portion 37 and the second second face. The outer vertical wall portion 35 is the same length, and the second front wall portion 36 and the second rear wall portion 34 form a substantially rectangular second closed cross-sectional shape portion 32 having the same length.

  In the door impact beam 50 configured in this manner, the first front wall portion 26 side of the first closed cross-sectional shape portion 22 to which the impact load P is input from the side of the vehicle body via the door outer panel due to a side collision or the like, Two closed cross-sections 32 of the second front wall 36 side are separated from each other, and the first inner vertical wall 27, the first outer vertical wall 25, the second inner vertical wall 37, and the second outer vertical wall. Since the portions 35 are arranged in parallel with each other, the mutual deformation is not constrained, and when the impact load P is input to the first front wall portion 26, the first inner vertical wall portion 27 and the first first portion in the initial stage. The outer vertical wall portion 25 begins to buckle and the intermediate portions are separated from each other. Similarly, the second front wall portion 36 also has the second inner vertical wall portion 37 and the second outer vertical wall portion 35 in the initial stage due to the impact load P. The buckling deformation where the middle part of the Thereafter Buckling first inner vertical wall 27 and the second inner vertical wall portion 37 as shown in FIG. 8 (b) which deforms slightly deformation is restrained in contact.

  In addition, since the first end surface portion 28 and the second end surface portion 38 are welded to the surface opposite to the impact load input side of the base portion 21, that is, the side to which a tensile load is applied, the base portion when the impact load is input. 21 and the first end surface portion 28 and the second end surface portion 38 are deformed, the first end surface portion 28 and the second end surface portion 38 peel from the base portion 21, and the first closed cross-sectional shape portion 22 and the second closed surface portion 22 are separated. The cross-sectional shape of the cross-sectional shape portion 32 is destroyed, and the rigidity of the door impact beam 50 is rapidly reduced. As a result, the door impact beam 50 is induced to bend or bend, and there is a concern that the drag of the door impact beam 50 against the impact load P is abruptly reduced. On the other hand, the bent portion 25a of the first front wall portion 26 and the first outer vertical wall portion 25, and the bent portion 24a of the first outer vertical wall portion 25 and the first back wall portion 24 are substantially perpendicular and are closed first. The amount of bending deformation of the portion accompanying the crushing deformation of the cross-sectional portion 22 is relatively large, and there is a concern that the bent portions 24a and 25a are damaged. Similarly, the bent portion 35a of the second front wall portion 36 and the second outer vertical wall portion 35, and the bent portion 34a of the second outer vertical wall portion 35 and the second back wall portion 34 are substantially perpendicular and are second closed. The amount of bending deformation of the portion accompanying the crushing deformation of the cross-sectional portion 32 is relatively large, and there is a concern that the bent portions 34a and 35a are damaged. Due to these breakage, a sudden shape change and behavior of the first closed cross-section shape portion 22 and the second closed cross-section shape portion 32 are induced, and a stable drag of the door impact beam 50 against an impact load cannot be obtained, and energy There is concern about a decrease in absorbability.

  Therefore, in the door impact beam 50 in the comparative example, when the impact load P is input to the first front wall portion 26 and the second front wall portion 36, the first inner side that forms the first closed cross-sectional shape portion 22 in the initial stage. The deformation behavior of the vertical inner wall portion 37 and the second outer vertical wall portion 35 forming the vertical wall portion 27, the first outer vertical wall portion 25, and the second closed cross-sectional shape portion 32 starts, and the resistance against the impact load P is increased. In the door impact beam 50 due to a significant decrease in rigidity and a decrease in rigidity due to buckling deformation of the first inner vertical wall portion 27, the first outer vertical wall portion 25, the second inner vertical wall portion 37, and the second outer vertical wall portion 35. There is a concern that the impact energy absorption performance may be reduced due to deformation such as bending.

  According to the present embodiment, the door impact beam 20 is a cross section provided with a first closed cross-sectional shape portion 22 and a second closed cross-sectional shape portion 32 having a substantially trapezoidal cross section by roll forming excellent in productivity from a thin plate made of a high-tensile steel plate. By forming into a shape, the door impact beam 20 that is lightweight and excellent in resistance to impact load P and impact energy absorption characteristics can be obtained easily and inexpensively. Further, since the door impact beam 20 is coupled to the door inner panel 13 by the front beam bracket 41 and the rear beam bracket 45 coupled by spot welding having excellent productivity, the assembly workability is excellent. Further, the occurrence of electrolytic corrosion between the door impact beam 20 and the front beam bracket 41 and the rear bracket 45 coupled to each other is suppressed, and durability is improved.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of invention. For example, in the above embodiment, the front end portion 20a of the door impact beam 20 is fitted to the impact beam mounting portion 43 of the front beam bracket 41 by spot welding and is joined by spot welding. 11, and a base 52 and a door impact that can be superposed on the front flat portion 16 of the door inner panel 13 instead of the front beam bracket 41 as shown in FIG. The first back wall 24 and the second back wall 34 of the beam 20 include a flat front beam bracket 51 having a beam mounting portion 53 that can be overlapped, and the first back wall at the front end 20 a of the door impact beam 20. 24 and the second back wall portion 24 are superposed on the beam mounting portion 53 so that the edges of the first back wall portion 24 and the second back wall portion 34 are aligned as shown in FIG. The front beam bracket 51 is coupled to the front end 20a of the door impact beam 20 by CS welding to the cable mounting portion 53, and the base 52 of the front beam bracket 51 is overlapped with the front flat portion 16 of the door inner panel 13. The front end portion 20a of the door impact beam 20 can be joined to the front flat portion 16 of the door inner panel 13 by spot welding. In this case, it is not necessary to form the electrode insertion opening 29 at the front end 20a of the door impact beam 20, and the shape of the door impact beam 20 can be simplified.

  10A shows a sectional view of the door main body 11 and FIG. 10B shows a view taken along arrow C of FIG. 10A, the first rear wall at the front end 20a of the door impact beam 20 is shown. The portion 24 and the second back wall portion 34 are superposed on the front flat portion 16 of the door inner panel 13, and the first back wall portion 24 and the second back wall portion 34 are spot welded to the front flat portion 16. it can. In this case, the front beam bracket can be eliminated, and the configuration can be simplified.

  In the above embodiment, the case where the energy absorbing beam is a door impact beam arranged in the front side door has been described as an example. However, for example, the energy absorbing beam is arranged in the door impact beam of the rear door or in the front bumper provided at the front end of the vehicle. It can also be applied to other energy absorbing beams such as bumper beams.

DESCRIPTION OF SYMBOLS 1 Car body main body 7 Door opening part 10 for front side doors Front side door 11 Door main body 12 Door outer panel 13 Door inner panel 20 Door impact beam (energy absorption beam)
21 base 21a upper edge 21b lower edge 22 first closed cross-sectional shape part 23 first inclined wall part 23a bent part 24 first back wall part (first tensile side surface part)
24a bent portion 25 first outer vertical wall portion 25a bent portion 26 first front wall portion (first compression side surface portion)
26a bent portion 27 first inner vertical wall portion 27a bent portion 28 first end surface portion 28a edge 29 electrode insertion opening 32 second closed sectional shape portion 33 second inclined wall portion 33a bent portion 34 second back surface Wall (second tensile side)
34a bent portion 35 second outer vertical wall portion 35a bent portion 36 second front wall portion (second compression side surface portion)
36a bent portion 37 second inner vertical wall portion 37a bent portion 38 second end surface portion 38a edge 39 electrode insertion opening 41 front beam bracket 43 impact beam mounting portion 45 rear beam bracket 46 impact beam mounting portion 51 front side Beam bracket

Claims (4)

A plurality of closed cross-sectional shape portions formed by a tension side surface portion and a compression side surface portion that face each other in the direction of impact load input, and a plurality of vertical wall portions laid between the tension side surface portion and the compression side surface portion. In the vehicle energy absorbing beam extending in a direction intersecting the impact load input direction and having both ends supported by the vehicle body member,
Roll-formed using a thin plate made of high-tensile steel plate, and includes a base portion extending in a direction crossing the impact load input direction and facing the impact load input direction in a cross-sectional shape,
A first tensile side surface extending from one edge of the base opposite to the impact load input direction; a first tensile side surface extending from the end of the first tensile side surface at an obtuse angle toward the impact load input side; 1 outer compression wall part, the 1st compression which bends at an acute angle from the edge part of this 1st outside vertical wall part, opposes the above-mentioned impact load entry direction, and extends in parallel facing the above-mentioned 1st tension side part A side surface portion, a first inner vertical wall portion that is bent at a substantially right angle in a direction away from the impact load input side from an end portion of the first compression side surface portion and extends along the impact load input direction; and A hollow trapezoidal first closed cross-sectional shape part that is bent at the end of the first inner vertical wall part and is continuous with the first end face part joined to the base part;
A second tensile side surface extending from the other edge of the base in a direction away from the first tensile side surface and facing the impact load input direction, and the impact load input from an end of the second tensile side surface A second outer vertical wall portion that is bent at an obtuse angle and extends toward the first compression side surface portion at an acute angle from the end of the second outer vertical wall portion, and faces the impact load input direction. And a second compression side surface extending in parallel to face the second tension side surface, and bent at a substantially right angle from the end of the second compression side surface in a direction away from the impact load input side. A second inner vertical wall portion extending in parallel to face the first inner vertical wall portion, and a second end surface portion that is bent at the end of the second inner vertical wall portion and joined to the base portion And a hollow trapezoid-shaped second closed cross-sectional shape part that is continuous,
The energy absorption beam for vehicles, wherein the first end surface portion and the second end surface portion are laminated on the surface of the base on the impact load input side and welded to the base . Between the one edge of the base portion and the first tensile side surface portion, a first inclined wall portion gradually separating from the impact load input side as it moves from the base portion to the first tensile side surface portion is interposed,
The second inclined wall portion that gradually separates from the impact load input side as it moves from the base portion to the second tensile side surface portion is interposed between the other edge of the base portion and the second tensile side surface portion. 2. An energy absorbing beam for a vehicle according to 1. A door impact beam extending in the front-rear direction along the door outer panel is supported by the door main body in the door main body having a door outer panel and a door inner panel for opening and closing the door opening of the vehicle body. In the arranged vehicle door structure,
The door impact beam is
It is roll-formed using a thin plate made of high-tensile steel plate, extends in the front-rear direction along the door outer panel, and has a base portion facing the door outer panel in a cross-sectional shape,
A first tension side surface portion extending upward from an upper edge of the base portion; a first outer vertical wall portion extending from an end portion of the first tension side surface portion at an obtuse angle toward the door outer panel side; A first compression side surface portion that is bent downward at an acute angle from an end of the outer vertical wall portion and faces the door outer panel and extends parallel to the first tension side surface portion; A first inner vertical wall portion extending at a substantially right angle in a horizontal direction away from the door outer panel side from the end of the door, and a bent portion formed at the end portion of the first inner vertical wall portion. A hollow trapezoidal first closed cross-sectional shape part in which a first end face part to be joined is continuous;
A second tension side surface portion extending downward from the lower edge of the base portion, a second outer vertical wall portion extending from the end of the second tension side surface portion at an obtuse angle toward the door outer panel side, the second A second compression side surface portion that bends upward at an acute angle from an end of the outer vertical wall portion and faces the door outer panel and extends parallel to the second tension side surface portion; A second inner vertical wall portion that is bent substantially at a right angle in the horizontal direction away from the door outer panel side from the end of the first outer wall and extends in parallel to face the first inner vertical wall portion, and a second inner vertical wall portion A hollow trapezoid-shaped second closed cross-sectional shape part that is continuous with a second end face part that is bent at the end part and joined to the base part, and is integrally formed,
The vehicle door structure according to claim 1, wherein the first end surface portion and the second end surface portion are laminated on a surface of the base portion on the door outer panel side and welded to the base portion . A first inclined wall portion gradually separating from the door outer panel as it moves from the base portion to the first tensile side surface portion between the upper edge of the base portion and the first tensile side surface portion;
According to claim 3, characterized in that the second inclined wall portions gradually away from the door outer panel in accordance with the transition from the base portion between the lower edge and the second tension side portion of the base portion to the second tension side portion intervenes Vehicle door structure.

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