JP6075107B2 - Vehicle back door reinforcement structure - Google Patents

Description

  The present invention relates to a vehicular back door reinforcing structure, and more particularly to a reinforcing structure in which a back door is connected to be opened and closed by a balancer such as a gas damper.

  A back door exists at the rear of the vehicle such as a hatchback vehicle. As the back door, a flip-up type is generally popular. As exemplified in Patent Document 1, a flip-up back door is connected to a vehicle so as to be opened and closed by a balancer (also referred to as an open stay) such as a gas damper.

  The balancer has an extendable rod. The balancer normally has a structure in which the pressure of the internal gas is applied in the direction in which the rod extends so that the door can remain open when the back door is opened. Therefore, when the back door with the rod contracted is closed, a high pressure (repulsive force) of internal gas is applied to the connection position of the back door to which the balancer is connected.

  When the back door is closed, the user pushes down the door against the repulsive force of the balancer. Therefore, an overstroke (overshoot) often occurs temporarily at the moment when the door is closed. When the door closes due to overstroke in this way, a large stress is applied to the door and the vehicle.

  In order to reduce the overstroke, an elastic stopper rubber is attached to the back door. However, since most of the stopper rubbers are attached so as to interfere (elastically deform) with the vehicle when the door is closed, the elastic force of the stopper rubber is always applied to the door and the vehicle when the door is closed.

  As described above, since various forces are applied to the back door, it is often performed to reinforce a portion requiring rigidity with a reinforcing member. Patent Document 1 describes a structure in which the periphery of the connection position of the balancer is reinforced in order to reliably support the repulsive force of the balancer.

JP 2010-70130 A

  However, the reinforcing structure described in Patent Document 1 requires a change in the shape of the inner panel itself, such as providing an accommodation recess for accommodating the balancer in the inner panel and providing a groove-like recess next to it. The change of the shape of the inner panel itself cannot be easily changed compared to the shape of the reinforcing member. In the reinforcing structure described in Patent Document 1, the shapes of the inner panel and the reinforcing member are complicated, and the degree of freedom is poor. Furthermore, Patent Document 1 does not mention the stopper rubber at all, and does not consider any reinforcement around the stopper rubber.

  In view of the above problems, the present invention provides a vehicle for which sufficient rigidity can be ensured by reinforcement using a reinforcing member so as to withstand various forces applied to the back door without changing the shape of the inner panel itself. It aims at providing a back door reinforcement structure.

  In order to solve the above problems, a typical configuration of the present invention is a vehicle back door reinforcement structure including a flip-up back door installed at the rear of the vehicle and two balancers that keep the back door open. The back door includes a window frame in which a rear window is installed and an inner panel in which two openings located on the left and right below the window frame are formed, and the lower edge of the window frame and the two openings of the inner panel. Each balancer is set between the window frame and each opening, including two reinforcing members that reinforce the inner panel over each edge and a continuous portion connecting each outer lateral edge of the inner panel itself. A force that is connected to the inner panel and each reinforcing member at the connecting position and is directed to the lower side of the back door is applied to the back door, and each reinforcing member is directed to the front or rear of the vehicle at the lower side of the connecting position. Has a vertical wall portion extending upstanding vertically Te, characterized in that it is joined to the inner panel at a first junction in the vicinity of the vertical wall portion.

  According to the said structure, the vertical wall part extended in an up-down direction is formed under the connection position where the repulsive force of a balancer is applied. Since the repulsive force of the balancer is a force applied to the connecting position toward the lower side of the back door, it is effective to withstand this force by forming a vertical wall portion extending vertically in the lower side of the connecting position. The back door can be reinforced.

  In particular, by joining the vicinity of the vertical wall portion to the inner panel, the inner panel can be effectively reinforced so as to withstand the repulsive force of the balancer without changing the shape of the inner panel itself.

  The back door reinforcing structure for a vehicle according to the present invention further includes a stopper rubber attached to the inner panel and the reinforcing member on the outer lateral edge side of the connecting position described above, and the inner panel and the reinforcing member on the side opposite to the stopper rubber at the connecting position. Is provided between the connecting position and the stopper rubber, and between the connecting position and the stopper rubber, on the cut surface cut through the connecting position, the stopper rubber and the second connecting point. It is preferable that the inner panel and the reinforcing member form a closed section between the points.

  According to the said structure, stopper rubber is attached to the site | part by which the inner panel was reinforced with the reinforcement member. Thereby, since the periphery of the stopper rubber becomes a portion where the reinforcing effect by the reinforcing member can be enjoyed, resistance to the force from the stopper rubber can be provided.

  Also, between the connection position and the stopper rubber and between the connection position and the second joint point, the inner panel and the reinforcing member form a closed cross section so that the closed cross section supports the connection position from the left and right. It has become. Thereby, sufficient rigidity can be secured around the connection position so as to withstand the force applied to the connection position.

  Further, the closed cross section between the connection position and the stopper rubber has an effect of being able to withstand the longitudinal force applied to the stopper rubber at the moment when the back door is closed. That is, by providing such a closed cross section, sufficient rigidity can be secured around the stopper rubber so as to withstand the force in the front-rear direction.

  According to the present invention, a vehicle back door reinforcement capable of securing sufficient rigidity by reinforcement using a reinforcing member so as to withstand various forces applied to the back door without requiring a change in the shape of the inner panel itself. Structure can be provided.

It is a figure which shows the motor vehicle which is embodiment of the back door reinforcement structure for vehicles by this invention. It is the figure which looked at the inner panel of the back door of FIG. 1 from the vehicle inner side. It is a figure which attaches a balancer and stopper rubber to the inner panel of FIG. It is a perspective view of the reinforcement member of FIG. It is a schematic diagram which shows typically the state which joined the reinforcement member of FIG. 4 to the inner panel. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a figure which shows the 1st application example of this embodiment. It is a figure which shows the 2nd application example of this embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  In the drawing, “vehicle front side” is represented by arrow Fwd, “vehicle right side” is represented by arrow Rh, and “vehicle upper side” is represented by arrow Up.

  FIG. 1 is a diagram showing an automobile 100 as an embodiment of a vehicle back door reinforcing structure according to the present invention. FIG. 1A is a view of the automobile 100 viewed from an oblique rear side, and FIG. 1B is a view showing a state in which the back door 102 of the automobile 100 is opened.

  As shown in FIG. 1A, the automobile 100 includes a flip-up back door 102 at the rear of the vehicle. As shown in FIG. 1B, the back door 102 is connected by two balancers 104 and 106 so as to be opened and closed. As shown in FIGS. 1A and 1B, the back door 102 includes an inner panel 108 and an outer panel 110.

  FIG. 2 is a view of the inner panel 108 of the back door 102 of FIG. 1 as viewed from the inside of the vehicle. As shown in FIG. 2, the inner panel 108 has a window frame 114 on which a rear window 112 (see FIG. 1B) is installed, and two openings 116 and 118 located on the left and right below the window frame 114. And are formed. The two openings 116 and 118 are service holes for taking out the back door main harness.

  The back door 102 includes two reinforcing members 120 and 122 (illustrated by dotted lines in FIG. 2) that reinforce the inner panel 108. The reinforcing members 120 and 122 include the lower edge 114a of the window frame 114 of the inner panel 108, the edges 116a and 118a of the two openings 116 and 118, and the outer lateral edges 108a and 108b of the inner panel 108 itself. The inner panel 108 is reinforced over the continuous parts to be connected.

  FIG. 3 is a view of attaching the balancer 104 and the stopper rubber 124 to the inner panel 108 of FIG. Hereinafter, the structure on the right side of the vehicle of the back door 102 will be described, but the same description applies to the structure on the left side of the vehicle that is symmetrical to the structure.

  As shown in FIG. 3, the balancer 104 is connected to the inner panel 108 and the reinforcing member 120 at a connection position 126 set between the window frame 114 and the opening 116. As the connecting means, fastening with bolts and nuts (welding nuts) or the like is preferable. The balancer 104 is a gas damper or the like, and a force (internal gas pressure) toward the lower side of the back door 102 is applied to the connection position 126 by the pressure of the internal gas. In the automobile 100, this force maintains the opened state after the back door 102 is opened.

  A stopper rubber 124 is attached to the inner panel 108 and the reinforcing member 120 via a resin bracket 128 on the outer lateral edge 108 a side of the connection position 126. The resin bracket is preferably attached by fastening with bolts and nuts (welding nuts). The stopper rubber 124 is an elastic member and relieves overstroke when the back door 102 is closed. The stopper rubber 124 is attached so as to interfere with the main body of the automobile 100 when the back door 102 is closed.

  In the automobile 100, various forces are applied to the back door 102 via the stopper rubber 124. On the other hand, by attaching the stopper rubber 124 to a portion where the inner panel 108 is reinforced by the reinforcing member 120, the periphery of the stopper rubber 124 becomes a place where the reinforcing effect by the reinforcing member 120 can be enjoyed. Accordingly, resistance against the force from the stopper rubber 124 can be provided.

  4 is a perspective view of the reinforcing member 120 of FIG. As shown in FIG. 4, the reinforcing member 120 has a vertical wall portion 130. The vertical wall portion 130 is a portion that stands up toward the front or rear of the vehicle.

  FIG. 5 is a schematic view schematically showing a state in which the reinforcing member 120 of FIG. 4 is joined to the inner panel 108. In FIG. 5, the inner panel 108 is indicated by a virtual line, and the reinforcing member 120 is indicated by a solid line. A contact portion between the inner panel 108 and the reinforcing member 120 is indicated by hatching, and a joint point (spot welding point) between the inner panel 108 and the reinforcing member 120 is indicated by cross hatching. The position of the resin bracket 128 to which the stopper rubber 124 is attached is shown as a bracket position 138.

  As shown in FIG. 5, the vertical wall portion 130 (schematically illustrated by a dotted line in FIG. 5) extends in the vertical direction and is located below the connection position 126. By forming the vertical wall portion 130 below the connection position 126, the back door 102 can be effectively reinforced so as to withstand the repulsive force of the balancer 104 applied to the connection position 126.

  In particular, the reinforcing member 120 is joined to the inner panel 108 at first joining points 132 and 134 in the vicinity of the vertical wall portion 130. Here, a first junction point 132 is provided near the upper portion of the vertical wall portion 130, and a first junction point 134 is provided near the lower portion of the vertical wall portion 130. Thereby, the inner panel 108 can be effectively reinforced so as to withstand the repulsive force of the balancer 104 without changing the shape of the inner panel 108 itself.

  As described above, in the present embodiment, the two first joint points 132 and 134 are provided, but the number and positions of the “first joint points” functioning to withstand the repulsive force of the balancer 104 are as follows. The present embodiment is not limited to this. That is, the “first joint point” may be provided at any position as long as it is provided in the vicinity of the vertical wall portion 130, and the number thereof may be an arbitrary number of one or more. Further, in this embodiment, spot welding is used as the joining method of these “first joining points”. However, the present invention is not limited to this. For example, the joining may be performed using bolts and nuts (welding nuts).

  A second joining point 136 for joining the inner panel 108 and the reinforcing member 120 is provided on the opposite side of the connecting position 126 to the bracket position 138 (stopper rubber 124).

  FIG. 6 is a cross-sectional view taken along the line AA of FIG. 5 and shows a cut surface cut through the connection position 126, the bracket position 138 (stopper rubber 124), and the second joining point 136. As shown in FIG. 6, in such a cut surface, the inner panel 108 is provided between the connection position 126 and the bracket position 138 (stopper rubber 124) and between the connection position 126 and the second joining point 136, respectively. And the reinforcing member 120 form closed sections 140 and 142. As a result, the closed cross-sections 140 and 142 support the connection position 126 to which a force toward the lower side of the back door 102 is applied from the left and right. Therefore, sufficient rigidity can be secured around the connection position 126 so as to withstand the force applied to the connection position 126.

  Further, the closed cross section 140 between the coupling position 126 and the bracket position 138 (stopper rubber 124) has an effect of being able to withstand the force in the front-rear direction applied to the stopper rubber 124 at the moment when the back door 102 is closed. That is, by providing such a closed cross-section 140, sufficient rigidity can be secured around the stopper rubber 124 so as to withstand this longitudinal force.

  7 is a cross-sectional view taken along the line BB in FIG. As shown in FIG. 7, the inner panel 108 has a flange 144 at the edge of the opening 116. Thereby, the rigidity of the inner panel 108 can be increased.

  In the automobile 100 described above, the vertical wall portion 130 is provided on the lower side of the connection position 126, closed cross sections 140 and 142 are provided on the left and right of the connection position 126, and a substantially “T” shape is formed around the connection position 126. Reinforcement is performed. As a result, sufficient rigidity can be secured by reinforcement using the reinforcing members 120 and 122 so that the inner panel 108 itself does not need to be changed in shape and can withstand various forces applied to the back door 102.

  FIG. 8 is a diagram illustrating a first application example of the present embodiment. As shown in FIG. 8, instead of the inner panel 108, a ground terminal 146 may be attached to the reinforcing member 120 with a bolt / nut (welding nut) or the like. Thereby, the production efficiency of the inner panel 108 on the molding line can be improved.

  FIG. 9 is a diagram illustrating a second application example of the present embodiment. As shown in FIG. 9, the stopper rubber 224 may be directly attached to the inner panel 108 without using the resin bracket 128. This eliminates the need for the resin bracket 128, thereby reducing the cost.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this example. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  The present invention can be used for a vehicle back door reinforcing structure.

DESCRIPTION OF SYMBOLS 100 ... Automobile, 102 ... Back door, 104, 106 ... Balancer, 108 ... Inner panel, 108a, 108b ... Outer lateral edge, 110 ... Outer panel, 112 ... Rear window, 114 ... Window frame, 114a ... Lower edge, 116, 118 ... Opening part 116a, 118a ... Opening edge 120,122 ... Reinforcing member 124,224 ... Stopper rubber 126 ... Connecting position 128 ... Resin bracket 130 ... Vertical wall part 132,134 1st Joint point 136 136 Second joint point 138 Bracket position 140 142 Closed section 144 Flange 146 Ground terminal

Claims (2)

In a vehicle back door reinforcement structure comprising a flip-up back door installed at the rear of the vehicle and two balancers that keep the back door open,
The back door includes a window frame in which a rear window is installed and an inner panel in which two openings located on the left and right below the window frame are formed,
Among the inner panels, including two reinforcing members that reinforce the inner panel over a continuous portion connecting the lower edge of the window frame, the edges of the two openings, and the outer lateral edges of the inner panel itself,
Each balancer is connected to the inner panel and each reinforcing member at a connection position set between the window frame and each opening, and applies a force toward the lower side of the back door to the back door,
Each reinforcing member has a vertical wall portion that stands up toward the vehicle front side or the vehicle rear side below the connection position and extends in the vertical direction, and the inner panel at a first joint point in the vicinity of the vertical wall portion. A vehicle back door reinforcing structure characterized by being joined to the vehicle. A stopper rubber attached to the inner panel and the reinforcing member on the outer lateral edge side of the connecting position;
A second joining point for joining the inner panel and the reinforcing member to the opposite side of the connecting position from the stopper rubber;
In the cut surface cut through the connection position, the stopper rubber and the second joint point, between the connection position and the stopper rubber and between the connection position and the second joint point, respectively. The back door reinforcing structure for a vehicle according to claim 1, wherein the inner panel and the reinforcing member form a closed cross section.

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