JP2015113053A - Door beam structure for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress bending deformation of door beams each having a closed cross sectional shape, upon a side impact of a vehicle, and to assemble the door beams to a door inner panel with the good balance and high positional accuracy.SOLUTION: In a door beam structure for a vehicle provided with door beams extending in a vehicle longitudinal direction, for reinforcing a door inner panel 1 and a door outer panel 2 of an automobile door, two door beams 4, 5 each having a closed cross sectional shape are disposed one above the other. Coupling brackets 6, 7 are fixed in planar contact with the door inner panel, in a state where front ends 4a, 5a and rear ends 4b, 5b of the two door beams are coupled together by the front and rear coupling brackets 6, 7 respectively. Between the two door beams, holes 12, 13 are provided at the front and rear coupling brackets, and the two door beams are disposed so as to be spaced apart from each other by at least a distance equal to a diameter of the hole.

Description

  The present invention relates to a vehicle door beam structure in which two upper and lower door beams are fixed to a door inner panel with front and rear brackets in response to a side collision of the vehicle.

  Conventionally, various vehicle door beam structures have been proposed in order to increase door strength (rigidity) against side collision (side collision) of a vehicle by arranging a door beam in a side door of an automobile (vehicle).

  For example, in Patent Document 1 (not shown), a single pipe-shaped impact beam is disposed between a door inner panel and a door outer panel of a side door of an automobile, and both ends of the impact beam in the vehicle front-rear direction are provided. It is described that it is fixed to the door inner panel via each bracket. The impact beam comes into contact with an impact absorbing pad in the door when the vehicle collides.

  FIGS. 7A to 7C show an embodiment of an automobile door panel 3 including a metal inner panel 1 and an outer panel 2. FIG. 7 shows the door panel 3 in the rear side door on the right side of the vehicle.

  The door panel 3 is formed in a hollow shape (monaca shape) by joining the outer peripheral side frame-like portions 9, 10, 18 and 25a of the door inner panel 1 to the outer peripheral edge of the plate-like door outer panel 2. The door panel 3 requires a metal reinforcement 31 that bridges the front and rear frame-like portions 9 and 10 in order to have resistance against beakiness (strength rigidity of the outer panel 2). Since the reinforcement 31 is bridged in the hollow portion of the door panel 3, the reinforcement 31 includes connecting portions 33 and 34 (see FIG. 8) with the door inner panel 1 at each end in the vehicle front-rear direction.

  In FIG. 7, reference numeral 11 is a work hole for arranging a wire harness and various mechanical components in the door panel 3, reference numeral 35 is a door latch mounting portion, reference numeral 36 is an outer handle mounting portion, and reference numeral 37 is a door opening / closing door. The hinge attachment portions are shown.

  FIG. 8 shows one form of the conventional reinforcement 31 attached to the door panel 3 as viewed from the door outer panel 2 side (the vehicle outer side). The reinforcement 31 is formed by press-molding a horizontally long metal plate in a substantially U-shaped cross section, and includes an upper and lower convex portion 38 projecting toward the door outer panel 2 (FIG. 7) and a concave portion 39 at the center in the width direction. Have. A hole 32 for engaging a pin of a robot arm (device) (not shown) for assembling the reinforcement 31 to the door inner panel 1 is provided on the front and rear end sides of the central recess 39. The front end portion 33 and the rear end portion 34 of the reinforcement 31 are fixed to the outer surface of the frame-like portions 9 and 10 of the door inner panel 1 by welding 40, respectively.

JP 2012-176733 A

  However, since the conventional door beam is long in the longitudinal direction of the vehicle, there is a concern that the door beam is likely to be bent and deformed by a side impact load, which may cause damage to the door beam. Further, when the reinforcement 31 has a U-shaped cross section, the U-shaped cross section is crushed or peeled off at the fixing portions 33 and 34 with the front and rear frame portions 9 and 10 of the door inner panel 1. There was a concern that it could cause deformation. Therefore, there is a demand for a reinforcing member that can prevent harmful bending deformation that occurs because the reinforcing member bridges the hollow portion of the door panel 3.

  In addition, as shown by a chain line in FIG. 8, when a pipe-shaped (closed cross-sectional shape) door beam 41 is used instead of a plate-shaped (open cross-sectional shape) reinforcement 31 according to the specification in the same form of an automobile door, Since the front and rear holes 32 of the plate-like reinforcement 31 are wrapped by the pipe-like door beam 41, a common robot arm (device) cannot be used in the vehicle assembly process, and extra man-hours and costs are increased. There was concern that the factory line would become complicated.

  Further, when the pipe-shaped door beam 41 is assembled to the door inner panel 1 using the robot arm, there is a concern that it is difficult to assemble the pipe-shaped door beam 41 to the door inner panel 1 with good balance (stability) and high positional accuracy. there were.

  Further, when the adhesive (mastic sealer) 14 is applied to the upper and lower convex portions 38 of the plate-like reinforcement 31 at a plurality of locations to fix the reinforcement 31 to the door outer panel 2 (FIG. 7), the plate Since the application position of the adhesive 14 to the cylindrical reinforcement 31 and the application position of the adhesive 14 to the pipe-shaped door beam 41 are different, a common adhesive application device and an adhesive application process cannot be used. There was a concern that the extra man-hours and costs would increase and the factory line would become complicated.

  In view of the above-described points, the present invention can suppress the deformation of the door beam having a closed cross-sectional shape at the time of a side collision of the vehicle, and can assemble the door beam to the door inner panel with good balance and positional accuracy. In addition, it aims at providing the door beam structure for vehicles which can be assembled | attached efficiently using the apparatus common to the reinforcement of the existing open cross-sectional shape.

  In order to achieve the above object, a vehicle door beam structure according to claim 1 of the present invention is a vehicle door beam structure provided with a door beam extending in the vehicle front-rear direction that reinforces a door inner panel and a door outer panel of an automobile door. Two door beams having a closed cross-sectional shape are arranged above and below, and the coupling bracket is connected to the door inner panel in a state where the front end portions and the rear end portions of the two door beams are connected by the respective front and rear coupling brackets. A hole is provided in the front and rear coupling brackets between the two door beams, and the two door beams are arranged at a distance of at least the diameter of the hole. Features.

  With the above configuration, each door beam is received by receiving a load (side collision load) at the time of a side collision of the vehicle in an area formed by two door beams and a front and rear coupling brackets coupled to the two door beams. The bending deformation (bending) of the single body is suppressed, and the folding accompanying the bending deformation of the single door beam is prevented. In addition, each door beam is not easily crushed due to the closed cross-section with respect to a side impact load, and the coupling bracket is fixed to the inner panel by surface contact at the fixed portion, so the door beam at the fixed portion against the load received by the door beam. Further, it is supported by three members of the coupling bracket and the door inner panel, so that deformation of the door beam and the like (deformation of the door beam cross section and peeling of the fixing portion) are suppressed.

  Also, when the door beam assembly is assembled to the door inner panel, a hole provided between the two door beams serving as the center of gravity of the door beam assembly (reinforcing member) integrated with the two door beams and the front and rear coupling brackets. The two door beams can be assembled at the same time with good balance and high positional accuracy.

  In addition, since the front and rear coupling brackets are provided with holes between the two door beams, the existing plate-shaped (open cross-sectional shape) reinforcement and the two closed cross-sectional shape door beams have a common robot arm. (Device) can be assembled to the door inner panel.

  The vehicle door beam structure according to claim 2 is the vehicle door beam structure according to claim 1, wherein the two door beams are arranged so that a center position of the length of the two door beams is shifted forward and backward between the front and rear coupling brackets. The door beams have different lengths.

  With the above configuration, the maximum deflection portion of the door beam due to the side impact load is different between the two door beams before and after the vehicle, so that the two door beams are prevented from being deformed at the same time, and the reinforcing effect by the door beams is enhanced.

  The vehicle door beam structure according to a third aspect is the vehicle door beam structure according to the first or second aspect, wherein the coupling bracket covers a circumference of 2/3 or more of the diameter to the center of gravity in the longitudinal cross section of the door beam. It is characterized by being bound in the direction.

  With the above-described configuration, the reinforcing effect is enhanced by receiving the force to bend in the direction (vertical direction) in which the two door beams are separated from each other at the time of a side collision of the vehicle by the surface of the coupling bracket that is turned around and coupled.

  The vehicle door beam structure according to a fourth aspect is the vehicle door beam structure according to any one of the first to third aspects, wherein the door outer panel and the door beam are positioned at the side portion of the center of gravity in the longitudinal cross-section of the door beam. And fixed with an adhesive.

  With the above configuration, the door outer panel is deformed by a side collision of the vehicle, and a load is transmitted to the fixing point of the door beam, so that the coupling bracket is not easily peeled off from the door inner panel at the fixing portion. Further, unevenness (elastic dent) due to a pressing load other than a side collision of the door outer panel from the outside of the vehicle is prevented. In addition, by applying an adhesive to the upper and lower door beams, an apparatus for applying the adhesive to the upper and lower portions of the existing plate-like (open cross-sectional shape) reinforcement can be used in common.

  According to the first aspect of the present invention, in the area formed by the upper and lower door beams and the front and rear coupling brackets, by receiving a side collision load on the vehicle, the bending deformation of each door beam is suppressed by suppressing the bending deformation of each door beam. Can be prevented. In addition, each door beam is not easily crushed by a closed cross section against a side impact load, and the coupling bracket is fixed to the inner panel by surface contact, so the load received by the door beam is called a door beam, a coupling bracket, and a door inner panel. Supporting with three members, it is possible to suppress the deformation of the door beam, the peeling of the door beam from the coupling bracket, and the peeling of the coupling bracket from the door inner panel.

  In addition, when assembling the two door beams and the front and rear coupling brackets together on the door inner panel, the two door beams are simultaneously balanced and positioned accurately by the holes provided between the two door beams that serve as the center of gravity. Can be assembled well. In addition, since each coupling bracket has a hole between the two door beams, it is possible to assemble the door inner panel with a small number of man-hours and costs using a common device with the existing open-section reinforcement. it can.

  According to the invention of claim 2, by making the maximum deflection part of the door beam due to the side impact load different between the front and rear of the vehicle with the two door beams, the two door beams are prevented from being deformed at the same time, The reinforcement effect by the door beam can be enhanced.

  According to the invention of claim 3, by receiving the force to bend in the direction in which the two door beams are separated from each other (vertical direction) at the time of a side collision of the vehicle, The reinforcing effect can be enhanced.

  According to the fourth aspect of the present invention, it is possible to transmit the deformation load of the door outer panel from the door beam to the coupling bracket at the time of a side collision of the vehicle, and to prevent the coupling bracket from peeling off from the door inner panel. Further, it is possible to prevent unevenness (elastic dent) when the door outer panel is pressed. Further, by applying an adhesive to the upper and lower door beams, it is possible to apply the adhesive with less man-hours and costs by using an apparatus common to an existing plate-shaped (open cross-sectional shape) reinforcement.

It is a side view which shows one Embodiment of the door beam structure for vehicles of this invention. It is a perspective view which shows one Embodiment of a door beam assembly. (A) is a perspective view showing a main part of a rear coupling bracket fixed to the door inner panel (a door beam is omitted for convenience), (b) is a diagram showing a coupling bracket assembled with an upper door beam. It is a perspective view of the state fixed to the panel. FIG. 2 is a cross-sectional view corresponding to AA in FIG. 1 showing a fixing structure between a door beam arranged in a door panel and a coupling bracket on the rear side (the enlarged portion is in a circle). FIG. 5 is a cross-sectional view corresponding to BB in FIG. 1 showing a door beam fixed to the door outer panel with an adhesive. It is a side view which shows the door beam (chain line) of this invention compared with the conventional reinforcement (solid line). 1A and 1B show an embodiment of a conventional automobile door including a vehicle reinforcement structure. FIG. 1A is a side view seen from the inside of the vehicle, FIG. 1B is a side view seen from the outside of the vehicle, and FIG. It is a side view which shows one subject of the conventional reinforcement structure for vehicles.

  FIGS. 1-5 shows one Embodiment of the door beam structure for vehicles of this invention.

  As shown in FIG. 1, this vehicle door beam structure has a door panel 3 (FIG. 4) in the vehicle front-rear direction between a metal door inner panel 1 and a door outer panel 2 (FIG. 4) that form a door panel of an automobile. Two door beams 4 and 5 having a closed cross-sectional shape to be bridged are provided on the upper and lower sides, and the front end portions 4a and 5a of the two door beams 4 and 5 are fixed to one front coupling bracket 6, and the two door beams 4 and 5 are fixed. 2 are fixed to one rear connecting bracket 7 to constitute the door beam assembly 8 shown in FIG. 2, and the front connecting bracket 6 of the door beam assembly 8 is connected to the door inner panel 1. It is fixed to the front frame 9 and the rear coupling bracket 7 is fixed to the rear frame 10 of the door inner panel 1.

  The door outer panel 2 (FIG. 4) also serves as a design, and the door inner panel 1 serves as both a reinforcement for the door outer panel 2 and a mounting seat for a mounting component. The door inner panel 1 and the door outer panel 2 are joined at the outer edge by a hem-type molding and an adhesive. Between the door inner panel 1 and the door outer panel 2, a door internal mechanism component such as a door latch is attached through a work hole 11 provided in the door inner panel 1.

  In the present embodiment, two upper and lower door beams 4 and 5 of a hollow round bar (pipe shape) are used. The closed cross-sectional shape of the door beams 4 and 5 (the cross-sectional shape in the direction orthogonal to the longitudinal direction of the beam) is not limited to a circle, and may be a triangle, a quadrangle, or other polygons. There exists an effect (it mentions later). Moreover, although the door beams 4 and 5 of this embodiment are comprised with the iron pipe, you may be formed with other sheet metal members, light alloys, such as aluminum and magnesium, and fiber reinforced resin besides an iron pipe.

  The door beams 4 and 5 are assembled to the door inner panel 1 in the state of the door beam assembly 8 (FIG. 2) in which the upper and lower door beams 4 and 5 are coupled to the front and rear metal coupling brackets 6 and 7 and integrated. To do. Circular or oval holes 12 and 13 are provided in the front and rear connecting brackets 6 and 7 between the two door beams 4 and 5, respectively.

  By inserting and engaging the front and rear pin portions of a robot arm (device) (not shown) into the holes 12 and 13 of the front and rear connecting brackets 6 and 7, the door beam assembly 8 is assembled to the door inner panel 1, and the respective connecting brackets are assembled. 6 and 7 are joined and fixed to the frame-like portions 9 and 10 on the front and rear sides of the door inner panel 1 by welding. Thereafter, after welding other welded parts to the door inner panel 1, the door outer panel 2 (FIG. 4) is joined to the outer edge of the door inner panel 1.

  In this embodiment, as will be described in detail with reference to FIG. 5, an adhesive (mastic sealer) 14 is applied to the upper and lower door beams 4 and 5, and the two door beams 4 and 5 are bonded and fixed to the door outer panel 2. To do.

  As shown in FIGS. 1 and 2, the two door beams 4 and 5 of the door beam assembly 8 are arranged substantially in parallel (precisely, as viewed from the front to the rear of the vehicle, the vertical direction between the two door beams. The distance is slightly increased in a taper shape, and the two door beams 4 and 5 are arranged linearly, respectively).

  As shown in FIG. 2, the front connecting bracket 6 includes a plate-like portion 15 on the outer side of the first half of the vehicle, a plate-like portion 16 on the inner side of the second half of the vehicle, and a stepped portion 17 connecting the front and rear plate-like portions 15 and 16. In the side view (viewed from the door outer panel 2 side), it is configured in a substantially trapezoidal shape. Receiving portions (supporting portions) 22 having a substantially semicircular cross section for arranging the front end portions 4a and 5a of the two door beams 4 and 5 are formed above and below the plate portion 16 in the latter half. A hole 12 is provided through the center in the width direction (in the middle of the upper and lower receiving portions 22). The shapes of the upper and lower receiving portions 22 are substantially the same.

  The front side of the front half plate-like portion 15 is in front of the vehicle inner surface (represented by reference numeral 9) of the front frame portion 9 of the door inner panel 1 of FIG. The connecting bracket 6 is fixed to the front frame 9 by welding. The front hole 12 is located in the recessed space 19 (FIG. 4) of the door inner panel 1 behind the front frame portion 9 of the door inner panel 1. The recessed space 19 includes a vehicle outer surface of the door inner panel portion 1a on the vehicle inner side (substitute with reference numeral 1a), and front and rear and lower frame-like portions 9 and 10 protruding from the door inner panel portion 1a toward the vehicle outer side. , 18 between the outer surfaces of the vehicle (represented by reference numerals 9, 10 and 18).

  The rear coupling bracket 7 is composed of a large substantially rectangular main plate-like portion 20 and a small vertically long rectangular sub-plate-like portion 21 that integrally protrudes upward from the rear half side of the main plate-like portion 20. Yes. A receiving part (supporting part) 23 having a substantially semicircular cross section for fixing the rear end part 5 b of the lower door beam 5 to the main plate-like part 20 is formed, and the rear end of the upper door beam 4 is formed on the sub-plate-like part 21. A receiving portion (supporting portion) 24 (see FIG. 3A) having a substantially semicircular cross section for fixing the portion 4b is formed.

  A hole 13 is provided through the upper half side of the main plate-like portion 20, that is, the center in the width direction of the coupling bracket 7 (between the upper and lower receiving portions 23 and 24). In the state where the inner surface of the rear half of the main plate portion 20 and the sub plate portion 21 is in contact with the outer surface of the frame portion 10 on the rear side of the door inner panel 1 of FIG. The rear coupling bracket 7 is fixed to the rear frame 10 by welding. The hole 13 is located in the recessed space 19 (FIG. 4) of the door inner panel 1 in front of the frame-like portion 10 on the rear side of the door inner panel 1.

  The upper door beam 4 is defined to be longer than the lower door beam 5. In the front coupling bracket 6, the front end 4 a ′ of the upper door beam 4 and the front end 5 a ′ of the lower door beam 5 are positioned with almost no deviation in the front-rear direction (precisely, the front end 5 a ′ of the lower door beam 5). Is slightly protruding forward from the front end 4a ′ of the upper door beam 4).

  In the rear coupling bracket 7, the rear end 4 b ′ of the upper door beam 4 protrudes greatly rearward from the rear end 5 b ′ of the lower door beam 5. The rear end 4 b ′ of the upper door beam 4 is positioned substantially at the rear end of the sub-plate-shaped portion 21, and the rear end 5 b ′ of the lower door beam 5 is positioned approximately in the front-rear direction center of the main plate-shaped portion 20. The lengths of the portions of the upper and lower door beams 4 and 5 that are in contact with the upper and lower receiving portions 23 and 24 are approximately the same. The center position in the longitudinal direction of the upper door beam 4 is shifted rearward from the center position in the longitudinal direction of the lower door beam 5. The front and rear ends 4a to 5b of the door beams 4 and 5 are preferably fixed to the receiving portions 22 to 24 of the coupling brackets 6 and 7 by welding, but are fixed by using means such as adhesion instead of welding. It is also possible to do.

  As shown in FIG. 1, the front coupling bracket 6 is slightly above the center in the height direction of the front portion of the inner panel portion (instead of the reference numeral 1a) except for the window frame portion 25 in the upper half of the door inner panel 1. The rear coupling bracket 7 is disposed substantially at the center in the height direction of the rear portion of the inner panel portion (1a). The front-side coupling bracket 6 in the example of FIG. 1 is disposed and fixed to a thick plate portion (the rear end of the thick plate portion is denoted by reference numeral 26) at the front portion of the door inner panel 1 using a tailored blank material. Although the door inner panel 1 of FIG. 1 is a rear side door on the right side of the vehicle, the door beam structure of the present invention can also be applied to a front side door (not shown).

  FIG. 3A shows a state in which a portion on the side of the sub-plate-like portion 21 on the upper side of the coupling bracket 7 on the rear side is fixed to the frame-like portion 10 on the rear side of the door inner panel 1 except for the door beam 4 for convenience. Is. In practice, as shown in FIG. 3B, the rear end portions 4b and 5b of the upper and lower door beams 4 and 5 are fixed to the receiving portions 23 and 24 of the sub plate portion 21 and the main plate portion 20, respectively. The welding is performed in a state in which the inner surface of the rear plate portions 20a and 21a of the sub plate portion 21 and the main plate portion 20 is in surface contact with the outer surface of the frame portion 10 on the rear side of the door inner panel 1. Fixed with etc. The rear end portion 4b of the upper door beam 4 is in contact with or close to the vehicle outer surface of the frame-shaped portion 10 of the door inner panel 1 through the receiving portion 24 of the sub-plate-shaped portion 21. That is, the rear end portion 4 b of the upper door beam 4 is supported so as to be hooked on the door inner panel 1 via the receiving portion 24.

  As shown in FIG. 4 which is a cross-sectional view corresponding to AA in FIG. 1, the upper receiving portion 24 of the rear coupling bracket 7 is a concave portion 24a curved in a substantially semicircular cross section having a bottom portion 24a ′ on the inner side of the vehicle. And a convex part 24b that follows the concave part 24a and has a mountain-shaped curved cross section. The bottom portion 24a 'of the recess 24a is located on the outer surface of the frame-like portion 10 on the rear side of the door inner panel 1 with a slight gap. Similarly, the lower receiving portion 23 of the rear coupling bracket 7 includes a concave portion 23a having an arcuate cross section and a convex portion 23b having an upper and lower cross-sectionally curved shape.

  The lower receiving portion 23 in FIG. 4 is a recess in front of the frame-like portion 10 on the rear side of the door inner panel 1 because the AA cross-sectional position in FIG. The rear end portion 5b of the lower door beam 5 is positioned to face the inner panel portion 1a.

  The depth H of the recesses 23a, 24a of the upper and lower receiving portions 23, 24 of the rear coupling bracket 7 is determined by the radius r of each door beam 4, 5 (the center of gravity O in the longitudinal cross section of the door beams 4, 5). (Diameter up to 2/3). Since the depth H of each receiving portion 23, 24 is not less than 2/3 of the radius r of each door beam 4, 5, the convex portions 23b, 24b on both the upper and lower sides of the concave portions 23a, 24a protrude high toward the outside of the vehicle. Thus, the vertical displacement (movement) of the door beams 4 and 5 is prevented at the time of a side collision of the vehicle. This configuration is the same in each receiving portion 22 of the front bracket 6 in FIG. In FIG. 4, reference numeral 2 denotes a door outer panel.

  As shown in a sectional view corresponding to BB in FIG. 1, the upper and lower door beams 4, 5 are doors except for a position near the frame-like portion 10 (FIG. 4) on the rear side of the door inner panel 1. It is located close to the outer panel 2. Then, an adhesive (mastic sealer) 14 applied to the outer arc-shaped outer surface of each door beam 4, 5 is adhered to the inner surface of the door outer panel 2, so that each door beam 4, 5 is attached to the door outer panel 2. It is fixed. The adhesive (mastic sealer) 14 is, for example, an existing one that initially has elasticity and is cured by heating.

  FIG. 6 shows the structure of the door beams 4 and 5 of the present invention in comparison with the structure of a conventional plate-like reinforcement 31 (see FIG. 8). The two door beams 4 and 5 of the present invention are indicated by chain lines for convenience.

  The positions of the plurality of dotted adhesives 14 applied to the upper and lower door beams 4 and 5 coincide with the positions of the plurality of adhesives 14 applied to the upper and lower portions of the conventional plate-like reinforcement 31 in a dotted manner. . Thus, the adhesive 14 is applied to the plate-shaped reinforcement 31 and the two pipe-shaped door beams 4 and 5 under the same application conditions (application position and application amount) by sharing the same application device. Can do.

  Further, the upper and lower pipe-like door beams 4 and 5 do not wrap (overlap) in the front and rear holes 32 of the plate-like reinforcement 31, and the positions of the front and rear holes 32 of the plate-like reinforcement 31 are as follows. Since the position generally corresponds to the positions of the holes 12 and 13 (FIG. 2) of the front and rear brackets 6 and 7 in the door beam assembly 8 (FIG. 2) including the two door beams 4 and 5, the same robot arm (assembly device) is used. In common, the door beam assembly 8 including the two door beams 4 and 5 can be assembled to the door inner panel 1 under the same conditions as the plate-like reinforcement 31.

  Below, the characteristic structure of the door beam structure for vehicles of this invention and its effect are demonstrated.

  As shown in FIG. 1, the first feature of the present invention is a door reinforcing structure in which a door beam extending in the vehicle front-rear direction for reinforcing a door inner panel 1 and a door outer panel 2 of an automobile door is provided. The door beams 4 and 5 are arranged vertically, and the front inner portions 4a and 5a and the rear end portions 4b and 5b of the door beams 4 and 5 are connected to the door inner via front and rear connecting brackets 6 and 7 that connect the upper and lower door beams. The two door beams 4 and 5 are arranged at a distance corresponding to at least the inner diameter of the holes 12 and 13 for fixing to the door inner panel 1 provided in the coupling brackets 6 and 7. It is in having established.

  By adopting this structure, it is possible to suppress the deformation of the door beams 4 and 5 themselves that bridge between the front and rear of the door panel 3 (FIG. 4) when a side impact load or the like is applied to the vehicle. Can be suppressed, and the effect of improving the strength of the door panel 3 can be obtained.

  In general, a door beam inside a door panel having fixed portions at the front and rear ends of the door panel 3 of the vehicle is bent and deformed at the center in the longitudinal direction with respect to a load such as a side collision (side collision) of the vehicle. Cheap. And it may be connected with the deformation | transformation which the fixing | fixed part of a door beam peels based on the bending deformation.

  According to the structure of the present invention, when a vehicle side impact occurs, a side impact load is received in an area formed by the two door beams 4 and 5 and the front and rear connecting brackets 6 and 7 for fixing the door beams 4 and 5. Therefore, the deformation of the door beams 4 and 5 and the door beam fixing portion (the portion where the door inner panel 1 is added to the coupling brackets 6 and 7) can be suppressed. In addition, the fixing points of the door beams 4 and 5 are subjected to a side collision load in a form in which the closed cross section of the door beams 4 and 5 is added with a three-piece connection by the surface contact between the connection brackets 6 and 7 and the door inner panel 1. Thus, it is possible to give rigidity to the bending of the central portion of the door beams 4 and 5, and to produce the effect of suppressing the deformation of the door beams 4 and 5. Further, by using two door beams 4 and 5, the same panel rigidity can be ensured with a door beam thinner than one door beam. Therefore, the door beam can be set longer than a single door beam, and can be embedded in the gap between the door inner panel 1 and the door outer panel 2.

  Further, the door beams 4 and 5 themselves form a closed cross section, and the side beam load received by the door beam fixing portion can be immediately transmitted to the door inner panel 1, and the closed cross section of the door beams 4 and 5 and the door inner panel can be transmitted. Since the side impact load is received at 1, deformation due to the collapse of the door beams 4 and 5 can be suppressed. Since the three door beam fixing portions are combined as described above, it is possible to suppress the peeling of the end portions 4a to 5b of the door beams 4 and 5 and the coupling brackets 6 and 7.

  Also, the door beams 4 and 5 fixed to the door inner panel 1 integrally with the coupling brackets 6 and 7 are provided between the door beams serving as the center of gravity of the two door beams 4 and 5 and the coupling brackets 6 and 7. By having 12 and 13, in the assembling work, the integrated parts (door beam assembly) 8 can be assembled while being supported in a well-balanced manner, so that the assembling position accuracy and assemblability can be improved. .

  The second feature of the present invention is that, as shown in FIGS. 1 and 2, the length between the joint portions of the two door beams 4 and 5 is different. In this example, the positions of the front ends 4a 'and 5a' of the two door beams 4 and 5 are substantially matched, and the positions of the rear ends 4b 'and 5b' are shifted back and forth.

  By adopting this structure, the parts of the upper and lower door beams 4 and 5 that are caused by the side impact load are bent at the same position (the part with the greatest deformation) in the vehicle longitudinal direction. It is possible to provide rigidity for suppressing deformation of the door panel surface due to bending starting from the abdominal part, leading to a reinforcing effect.

  As shown in FIGS. 3 to 4, the third feature of the present invention is that the connecting brackets 6, 7 have a diameter of not less than 2/3 of the diameter to the center of gravity O in the cross section orthogonal to the longitudinal direction of the door beams 4, 5. That is, the coupling brackets 6 and 7 are turned in the circumferential direction of the door beams 4 and 5 so as to cover them.

  By adopting this structure, the coupling bracket that has been turned in against the two door beams 4 and 5 being deformed in a direction away from each other due to a side impact load (the vertical direction in which the two door beams 4 and 5 spread). When the inner surfaces of 6 and 7 contact the outer surface of the door beam in the vertical direction and receive a load, the reinforcing effect of suppressing the bending deformation of the two door beams 4 and 5 away from each other occurs.

  As shown in FIG. 5, the fourth feature of the present invention is that the door outer panel 2 and the door beams 4 and 5 are mastic sealers at the side of the center of gravity O in the cross section perpendicular to the longitudinal direction of the door beams 4 and 5. (Adhesive) 14 is adhered.

  By adopting this structure, the transmission method of the side impact load to the door beams 4 and 5 (direction in which the door outer panel 2 strikes) is clarified, and the load is uniformly transmitted to the fixing portions of the door beams 4 and 5 and the coupling brackets 6 and 7. Therefore, it is possible to suppress a problem that the load is concentrated on a part of the fixed part and the fixed part is peeled off from the part as a starting point, and the reinforcing effect can be enhanced. Further, since the door outer panel 2 is supported by the door beams 4 and 5 from the inside of the vehicle, it is possible to prevent unevenness (elastic dent deformation) at the time of pressing other than the side collision of the door outer panel 2.

  The vehicle door beam structure of the present invention suppresses bending deformation of the door beam having a closed cross-sectional shape at the time of a side collision of the vehicle, and the door beam is assembled to the door inner panel with good balance and positional accuracy, in addition to the existing open cross section. It can be used for efficient assembly using a shape reinforcement and a common device.

DESCRIPTION OF SYMBOLS 1 Door inner panel 2 Door outer panel 4,5 Door beam 4a, 5a Front end part 4b, 5b Rear end part 6,7 Connection bracket 12,13 Hole 14 Adhesive

Claims (4)

In a vehicle door beam structure provided with a door beam extending in the vehicle front-rear direction for reinforcing a door inner panel and a door outer panel of an automobile door,
Two door beams having a closed cross-sectional shape are arranged above and below, and the coupling bracket is connected to the door inner panel in a state where the front end portions and the rear end portions of the two door beams are connected by the respective front and rear coupling brackets. Fixed with surface contact,
A hole for attachment to the door inner panel is provided in the front and rear connecting brackets between the two door beams, and the two door beams are arranged at least a distance corresponding to the diameter of the hole. A door beam structure for a vehicle.   2. The vehicle door beam structure according to claim 1, wherein the lengths of the two door beams are different so that a center position of the lengths of the two door beams between the front and rear coupling brackets is shifted forward and backward. .   3. The vehicle door beam structure according to claim 1, wherein the coupling bracket is connected by being wound around in the circumferential direction so as to cover 2/3 or more of the diameter to the center of gravity in the longitudinal cross section of the door beam.   The vehicle door beam structure according to any one of claims 1 to 3, wherein the door outer panel and the door beam are fixed with an adhesive at a side portion of the center of gravity in a longitudinal cross section of the door beam.

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