JP5669566B2 - Vehicle back door device - Google Patents

Description

  The present invention provides a resin back door pivotally supported by the rear wall so that it can be rotated upward and downward on the rear side of the rear wall of the vehicle body, and a damper tape laid between the rear wall and the door. It is related with the back door apparatus of the vehicle provided with these.

  Conventionally, there is a back door device for a vehicle described in Patent Document 1 below. According to this publication, a back door device for a vehicle is formed by coupling a door opening formed in a rear wall of a vehicle body with a sheet metal inner and an outer panel so as to have a hollow closed cross-sectional structure. A pair of left and right pivots for pivotally supporting the upper end of the door on the upper part of the rear wall so that the opening can be opened and closed and the lower side of the door is pivotable upward and downward on the rear side of the rear wall. A reinforcement that extends vertically and has one end attached to the rear wall and the other end attached to the inner panel, and a reinforcement that reinforces the attachment portion of the other end of the damper stay in the inner panel Material.

  The damper stage is usually a cylinder type filled with gas, is extendable in the longitudinal direction thereof, and is urged so as to always expand by the pressure of the gas.

  And when rotating the said door upwards, the said damper stay supports the dead weight of the said door, extending | stretching with the urging | biasing force. For this reason, the upward rotation of the door can be simplified. Further, when the door is pivoted upward and the door opening is fully opened, the damper stay supports all the weight of the door by its urging force. For this reason, the door is held in an upwardly rotated posture, that is, the door opening is held open.

  When the door is to be rotated downward from the above state, an external operation force is applied to the door so as to overcome the urging force from the damper stay. Then, the damper stay contracts while applying a biasing force to the downwardly rotating door. Then, this door rotates downward against the urging force from the damper stay, and closes the door opening.

Published Utility Heisei 3-121020

  By the way, as described above, when the damper stage supports the dead weight of the door rotated upward with its urging force, or when the operation force is applied to the door while opposing the urging force from the damper stage, the door is moved downward. In the case of turning, stress concentration may occur in the attachment portion of the other end of the damper stay in the inner panel based on the biasing force of the damper stay. Further, when the door closes the door opening, normally, the biasing force of the damper stay hardly acts on the door due to the assembly structure of the damper stay. For this reason, the door tends to close the door opening shockingly. In this case, the impact force may cause stress concentration in the mounting portion. When such stress concentration repeatedly occurs in the mounting portion described above, there arises a problem in life that the mounting portion is damaged early.

  Therefore, in the conventional technique, as described above, a reinforcing material for reinforcing the attachment portion of the other end portion of the damper stay in the inner panel is provided. However, since this reinforcing material is only fastened together with the mounting portion described above, there is a possibility that the reinforcing member will be insufficient as reinforcement of the mounting portion described above.

  Therefore, it is conceivable to couple the inner panel and the reinforcing material to each other by spot welding. However, since the joining operation by such spot welding is complicated, there is a possibility that the door forming operation becomes complicated.

  Further, when the above spot welding is adopted, there is a possibility that tensile stress is generated in the spot welded portion due to the impact force when the door closes the door opening impactively as described above, and this spot welded portion may be easily peeled off. is there. Therefore, it is conceivable to perform spot welding by increasing the thickness of the reinforcing material. However, increasing the thickness of the reinforcing material in this way increases the mass of the door accordingly. For this reason, especially when the door is made of resin to reduce the weight of the vehicle, the weight reduction of the vehicle is hindered.

  The present invention has been made paying attention to the above-described circumstances, and an object of the present invention is to enable the vehicle back door device to turn upward and downward on the rear side of the rear wall of the vehicle body. In the case where a resin back door pivotally supported on the rear wall and a damper stay laid between the rear wall and the door are provided, due to an external force applied to the door such as an urging force from the damper stay, It is intended to prevent stress concentration from occurring in the attachment portion of the damper stay, and thus to more reliably prevent damage to the attachment portion due to this stress concentration.

  Another object of the present invention is to make it possible to easily form a door and reduce the weight of the door even when the above object is achieved.

The invention according to claim 1 is formed by coupling a door opening 9 formed in the rear wall 4 of the vehicle body 2 with a resin inner and outer panels 13 and 15 so as to form a hollow closed cross-sectional structure. A back door 10 that can be opened and closed, and an upper end portion of the door 10 at an upper portion of the rear wall 4 so that the lower side of the door 10 can be rotated upward and downward A and B on the rear side of the rear wall 4. a pair of left and right pivot支具23 to pivot, extending vertically, the upper end is attached to the rear wall 4, a vehicle lower end and a Danpasute 38 attached to the inner panel 13 In the back door device,
A projecting member 43 that projects integrally from the rear surface of the upper vicinity of the mounting portion 13b of the lower end of the Danpasute 38 in the inner panel 13, one end side of the attachment portion 13b is attached, the other end portion side of the projecting member And a reinforcing member 45 attached to the projecting end portion of the vehicle 43.

  In addition, in this section, the reference numerals and drawing numbers appended to the above terms are not intended to limit the technical scope of the present invention to the “Example” section and the contents of the drawings described later.

  The effects of the present invention are as follows.

The invention according to claim 1 is a back door formed by coupling a door opening formed on the rear wall of the vehicle body, a resin inner and an outer panel so as to have a hollow closed cross-sectional structure, and closing the door opening so as to be openable and closable. And a pair of left and right pivots for pivotally supporting the upper end of the door on the upper part of the rear wall so that the lower side of the door can be rotated upward and downward on the rear side of the rear wall, and extends vertically , Moreover ends attached to the rear wall, the back door apparatus for a vehicle and a Danpasute the lower end is attached to the inner panel,
A projecting member which projects integrally from the rear surface of the upper vicinity of the mounting portion of the lower end portion of the Danpasute in the inner panel, one end is attached to the mounting portion, the other end portion side to the projecting end of the projecting member And a reinforcing material to be attached.

Here, when the damper stage supports the weight of the door rotated upward with its urging force, or when the door is rotated downward by applying an external operation force to the door against the urging force from the damper stage. , further, the door is pivoted downward, when the door opening impulsively closes, stress concentration due to an external force of the urging force and impact force to the mounting portion of the lower end portion of Danpasute in the inner panel Tends to occur.

  However, when an external force is applied to the mounting portion, the external force is large, and when at least a part of the external force is transmitted to the protruding end portion of the protruding body via the reinforcing material, the inner Compared to the case where the protrusion is made of resin and integrally protrudes from the panel, the external force is smoothly elastically bent by the external force transmitted as described above, and the external force is attached as described above. Concentrating on the department is effectively relieved. Therefore, stress concentration in the mounting portion described above due to this external force is more reliably prevented, and damage to the mounting portion due to the external force is more reliably prevented.

  In addition, since the above-described breakage prevention of the mounting portion is achieved without adopting spot welding, the door can be easily formed. Second, the protruding body protrudes integrally from the inner panel and is made of resin, and its elastic and lightweight characteristics are effectively used, and the external force is reduced as described above. For this reason, even when preventing the breakage of the mounting portion, by using the light projecting body as described above, an increase in the mass of the door can be prevented and the door can be lightened. This is extremely useful for a vehicle that is provided with a resin door and is intended to be lightweight.

It is a partial rear view of a vehicle body. It is a rear part side view of a vehicle body. FIG. 2 is a partially enlarged partial cutaway view of FIG. 1. FIG. 4 is an enlarged partial sectional view taken along line IV-IV in FIG. 1. FIG. 5 is an enlarged cross-sectional view taken along line VV in FIG. 3. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 1.

  The vehicle back door device of the present invention relates to a resin back door pivotally supported by the rear wall so that the vehicle back door device can be rotated upward and downward on the rear side of the rear wall of the vehicle body. In the case where a damper stay erected between the rear wall and the door is provided, stress concentration is prevented from occurring in the attachment portion of the damper stay in the door due to an external force applied to the door such as a biasing force from the damper stay, Therefore, in order to realize the object of more reliably preventing the damage to the mounting portion due to the stress concentration, the mode for carrying out the present invention is as follows.

That is, the vehicle back door device is formed by coupling a door opening formed in the rear wall of the vehicle body with a resin inner and outer panel so as to have a hollow closed cross-sectional structure, and closes the door opening so that it can be opened and closed. A back door, a pair of left and right pivots that pivot the upper end of the door to the upper part of the rear wall so that the lower side of the door can be rotated upward and downward on the rear side of the rear wall; to extend its upper end is attached to the rear wall, and a Danpasute the lower end is attached to the inner panel.

A projecting member which projects integrally from the rear surface of the upper vicinity of the mounting portion of the lower end portion of the Danpasute in the inner panel, one end is attached to the mounting portion, the other end portion side to the projecting end of the projecting member A reinforcing material to be attached is provided.

  In order to explain the present invention in more detail, an embodiment thereof will be described with reference to the accompanying drawings.

  In the figure, reference numeral 1 denotes a vehicle exemplified by an automobile, and an arrow Fr in the drawing indicates the front in the traveling direction of the vehicle 1. The left and right described below refer to the width direction of the vehicle body 2 toward the front of the vehicle 1.

  The interior of the vehicle body 2 is a vehicle compartment 3, and a rear surface portion of the vehicle body 2 is formed by a rear wall 4. The rear wall 4 includes a sheet metal rear wall main body 4a and a resin rear bumper 4b which covers the lower end portion of the rear wall main body 4a from the rear and is supported by the rear wall main body 4a.

  A back door device 6 is provided on the rear wall 4. The back door device 6 is symmetrical with respect to the vehicle body center line 7 in the width direction of the vehicle body 2 in the rear view of the vehicle body 2 (FIG. 1). The back door device 6 is formed in the rear wall 4 and communicates with the inside and outside of the vehicle compartment 3, a back door 10 that closes the door opening 9 so that it can be opened and closed from the rear, and the door opening 9. And a weather strip 11 that is elastically pressed against the front surface of the outer edge of the door 10.

  The door 10 forms the front side of the door 10 (the vehicle compartment 3 side), and an inner panel 13 that entirely closes the door opening 9 and is overlapped and adhered to the inner panel 13 from behind. And an outer panel 15 coupled to each other by the agent 14. In this case, at least the outer edge portions of both the panels 13 and 15 are bonded together with the adhesive 14 as a whole. The inner panel 13 is entirely made of a resin such as polypropylene (PP), and is integrally formed by injection molding. A horizontally long rectangular window opening 17 is formed through the upper portion of the inner panel 13.

  The outer panel 15 includes an upper panel 18 overlaid on the upper portion of the inner panel 13 above the window opening 17, a lower panel 19 overlaid on the lower portion of the inner panel 13 below the window opening 17, and Wind panels 20 overlapped on the respective sides of the inner panel 13, the lower edge of the upper panel 18, and the upper edge of the lower panel 19, which are positioned at the same height as the window opening 17. I have. The upper panel 18 and the lower panel 19 are made of resin such as polypropylene (PP), the window panel 20 is made of glass, and these 18 to 20 are also bonded to each other by an adhesive 14.

  Each portion in the surface direction of the door 10 constituted by the inner panel 13 and the outer panel 15 is a space 21 in which the interior is closed, that is, the door 10 has a hollow closed cross-sectional structure, and has strength and rigidity. And improvements are being made.

  The left and right sides pivoting the upper end of the inner panel 13 of the door 10 to the upper part of the rear wall 4 so that the lower side of the door 10 can be rotated upward and downward A and B on the rear side of the rear wall 4. A pair of pivot supports 23 and 23 are provided.

  Also, the door 10 protrudes forward on the left and right sides of the middle part of the vertical direction of the inner panel 13 of the door 10, presses against the rear surface of the rear wall body 4 a of the rear wall 4, and moves to that of the door 10. A pair of left and right upper stoppers 24, 24 that elastically prevent the forward movement described above, and left and right corners of the lower end portion of the inner panel 13, respectively, are projected forward, and the bumper 4b of the rear wall 4 A pair of left and right lower stoppers 25, 25 that press against the rear surface and elastically prevent further forward movement of the door 10, and the door 10 that is prevented from moving forward by the stoppers 24, 25 as described above. There is provided a locking device 26 that releasably locks the central portion in the left-right direction at the lower end of the rear wall 4 to the rear wall body 4a of the rear wall 4.

  A pair of left and right reinforcing plates 28 made of sheet metal are fixed to the rear surface (the inner surface on the space 21 side) of the upper end portion of the inner panel 13 with an adhesive, and the left and right ends of the upper end portion of the inner panel 13 are fixed by these reinforcing plates 28. Each side is reinforced.

  The pivot support 23 is brought into contact with the fixed side member 31 attached to the left and right side portions of the upper end portion of the rear wall 4 by the fastener 30 and the front surfaces of the left and right side portions of the upper end portion of the inner panel 13. A rotating side member 33 which is fastened together with the reinforcing plate 28 by other fasteners 32 and an axis 34 extending in the width direction of the vehicle body 2, and the rotating side member 33 together with the door 10. A pivot shaft 35 for pivotally supporting the pivot side member 33 on the fixed side member 31 is provided so as to pivot downward A and B.

  The door 10 extends in the vertical direction in the vicinity of the left and right sides of the inner panel 13 of the door 10, an upper end that is one end thereof is attached to the rear wall 4, and a lower end that is the other end is the inner of the door 10. A pair of left and right damper stays 38 attached to the panel 13 are provided. Specifically, the upper end portion of the damper stay 38 is attached to the upper portion of the rear wall 4 by a fastener (not shown) via the upper universal joint 39, and the lower end portion is an intermediate portion in the vertical direction of the inner panel 13. Is attached by a fastener 41 via a lower universal joint 40. The lower end of the damper stay 38 may be attached to the rear wall 4 and the upper end of the damper stay 38 may be attached to the inner panel 13 of the door 10.

  3 and 4, the damper stay 38 of the inner panel 13 is connected to the inner panel 13 from the attachment portion 13 a (the fastening portion of the rotation side member 33 by the fastener 30) 13 a of the pivot support 23 on the inner panel 13. The portion 13c of the inner panel 13 that reaches the other attachment portion (fastening portion of the lower universal joint 40 by the fastener 41) 13b has a continuous linear shape in a side view of the vehicle body 2 (FIG. 4). And is formed to extend in the substantially vertical direction.

  Specifically, the portion 13c of the inner panel 13 is a portion having a satin pattern in the rear view of the vehicle body 2 (FIG. 3). That is, the portion 13c of the inner panel 13 extends from the mounting portion 13a on the side of the upper end portion of the inner panel 13 to the outside of the vehicle body 2 and then bypasses the upper portion of the window opening 17. Then, it extends downward and reaches the other mounting portion 13b described above at the side portion of the intermediate portion of the inner panel 13 in the vertical direction.

  1-4, a pair of upper and lower projecting bodies 43, 43 projecting integrally from the rear side surface of the intermediate portion in the vertical direction of the inner panel 13 are provided. These protrusions 43 and 43 have a circular cross section and are located in the vicinity of the upper portion of the other mounting portion 13b described above. In addition, the said protrusion body 43 may be single and may be three or more. Moreover, a cross-sectional rectangle may be sufficient and plate shape may be sufficient.

  1 and 3 to 5, a reinforcing member 45 extending in the vertical direction in the space 21 is provided. One end side (lower end) in the longitudinal direction of the reinforcing member 45 is attached to the rear surface of the other attachment part 13b by fastening together with the fastener 41, and the other end side (vertical middle part) is attached. After being bent backward so as to be separated from the inner panel 13, it is attached to the projecting ends of the projecting bodies 43, 43 by fastening fasteners 44. The reinforcing member 45 is made of a sheet metal in which each section in the longitudinal direction has a U shape. In the rear view of the vehicle body 2 (FIG. 3), most of the reinforcing material 45 is disposed so as to overlap the portion 13c of the inner panel 13. Note that the attachment of the reinforcing member 45 to the protrusions 43 on the other end side may depend on clips, rivets, thermal welding, or the like.

  1, 3, and 4, it extends vertically in the space 21, its upper end is fastened to the reinforcing plate 28 by a fastener 48, and its lower end is fastened to the upper end of the reinforcing member 45 by a fastener 49. A reinforcing bar 50 is provided. In the rear view of the vehicle body 2 (FIG. 3), most of the reinforcing bar 50 is disposed so as to overlap the portion 13c of the inner panel 13. Further, in a side view of the vehicle body 2 (FIG. 4), the reinforcing bar 50 extends slightly parallel to the portion 13 c of the inner panel 13, slightly away from the portion 13 c of the inner panel 13.

  1 and 6, in the rear view of the vehicle body 2 (FIG. 1), the entire left and right corners of the lower end of the inner panel 13 are substantially linearly extended from the side edge 13d side to the lower edge 13e side. A weakly extending portion 52 is formed. The fragile portion 52 is formed by bending the corner portion of the inner panel 13 and is a groove 53 that opens forward. The bottom plate of the groove 53 is bonded to the front surface (the inner surface on the space 21 side) of the lower panel 19 of the outer panel 15 with an adhesive 14.

  The bottom plate of the groove 53 may not be adhered to the front surface of the lower panel 19 of the outer panel 15. The fragile portion 52 may be a bead or a long-hole-shaped slit extending from the side edge portion 13d side to the lower edge portion 13e side in the corner portion of the inner panel 13.

  The damper stage 38 is a cylinder type in which gas is sealed, is extendable in the longitudinal direction thereof, and is urged so as to always expand by the pressure of the gas.

  When the door 10 is pivoted upward A, the damper stay 38 supports the weight of the door 10 while being extended by the biasing force. For this reason, the upward rotation A of the door 10 can be made light. Further, when the door 10 is pivoted upward A and the door opening 9 is fully opened, the damper stay 38 supports the entire weight of the door 10 by the biasing force. For this reason, the door 10 is held in a posture in which the door 10 is pivoted upward A, that is, the door opening 9 is held open (dashed line in FIG. 2).

  When the door 10 is to be rotated downward B from the above state, an external operation force is applied to the door 10 so as to overcome the biasing force from the damper stay 38. Then, the damper stay 38 contracts while applying a biasing force to the door 10 that rotates B downward. Then, the door 10 turns downward B against the urging force from the damper stay 38 to close the door opening 9.

  As described above, the portion 13c of the inner panel 13 extending from the mounting portion 13a of the pivotal support 23 in the inner panel 13 to the other mounting portion 13b of the other end portion of the damper stay 38 in the inner panel 13 is the side surface of the vehicle body 2. It forms so that it may become a continuous linear shape in view (FIG. 4).

  For this reason, it is possible to prevent a break in strength from occurring in any part of the portion 13c of the inner panel 13 in the vertical direction. Accordingly, when the damper stage 38 supports the weight of the door 10 rotated upward A by the biasing force, or by applying an operation external force to the door 10 against the biasing force from the damper stage 38, the door 10 is In the case of the downward rotation B, stress concentration is suppressed from occurring in any part of the portion 13c of the inner panel 13 based on the biasing force of the damper stay 38, and the door 10 is prevented from being easily bent. The

  As a result, when the damper stage 38 supports the weight of the door 10 rotated upward A by the biasing force, the door 10 is prevented from being easily bent as described above, so that more stable support is achieved. can get. In addition, when the door 10 is rotated, the rotation operability of the door 10 is further improved because the door 10 is prevented from being easily bent as described above.

  In addition, as described above, the effect of obtaining the stable support of the door 10 and the improvement of the rotation operability of the door 10 is achieved by making the portion 13c of the inner panel 13 into a continuous linear shape as described above. Is done.

  For this reason, since it is not necessary to separately provide a reinforcing material that reinforces the inner panel 13 in order to prevent the door 10 from being bent, an increase in the number of parts of the door 10 is suppressed, that is, the structure is simple and inexpensive. The above effect is achieved. Moreover, since it is not necessary to provide a separate reinforcing material as described above, the above effect can be achieved while preventing an increase in the mass of the door 10, which is provided with the resin door 10 for the purpose of weight reduction. This is extremely useful for the vehicle 1.

  Further, as described above, the projecting body 43 integrally projecting from the rear surface in the vicinity of the other mounting portion 13b of the other end portion of the damper stay 38 in the inner panel 13 and the one end portion side are attached to the other mounting portion 13b, The other end is provided with a reinforcing member 45 attached to the protruding end of the protruding body 43.

  Here, when the damper stage 38 supports the weight of the door 10 rotated upward by the biasing force, or by applying an operation external force to the door 10 against the biasing force from the damper stage 38, the door 10 is When the door 10 is rotated downward B, and the door opening 9 is shockedly closed, the other mounting portion of the other end of the damper stay 38 on the inner panel 13 is applied. In 13b, stress concentration tends to occur due to the external force of the urging force or impact force.

  However, when an external force is applied to the other mounting portion 13b described above, the external force is large, and at least a part of the external force is transmitted to the protruding end portion of the protruding body 43 via the reinforcing member 45. The protrusion 43, which is integrally made of resin and protrudes from the inner panel 13 and is made of resin, bends smoothly and elastically by the external force transmitted as described above, as compared with the case where the protrusion 43 is made of metal. The external force is effectively alleviated from concentrating on the other mounting portion 13b. Therefore, stress concentration in the other mounting portion 13b described above due to this external force is more reliably prevented, so that damage to the other mounting portion 13b due to the external force is more reliably prevented.

  In addition, since the above-described damage prevention of the other mounting portion 13b is first achieved without using spot welding, the door 10 can be easily formed. Secondly, the protrusion 43 protrudes integrally from the inner panel 13 and is made of resin, and its elastic and lightweight characteristics are effectively used to reduce the external force as described above. The For this reason, even when preventing the other mounting portion 13b from being damaged, by using the light-weight projecting body 43 as described above, an increase in the mass of the door 10 can be prevented and the door 10 can be lightened. This is extremely useful for the vehicle 1 that is provided with the resin door 10 and is intended to reduce the weight.

  Further, as described above, the reinforcing bar 50 whose upper end is connected to the upper end of the inner panel 13 via the reinforcing plate 28 and whose lower end is connected to the middle part of the inner panel 13 in the vertical direction via the reinforcing member 45. Is provided.

  For this reason, when the resin inner panel 13 of the door 10 tries to expand due to the outside air temperature, the weight of the door 10, or the biasing force of the damper stay 38, this expansion is a reaction force that is a tensile stress on the reinforcing bar 50. Is prevented by Therefore, the favorable installation accuracy of the door 10 with respect to the door opening 9 of the said rear wall 4 is maintained.

  Further, as described above, when some external force is applied to the other mounting portion 13b of the other end portion of the damper stay 38 in the inner panel 13, a part of this external force is transmitted to the upper end portion side of the inner panel 13 by the reinforcing bar 50. Thus, the external force is dispersed. For this reason, it is prevented more reliably that stress concentration arises in the other attachment part 13b mentioned above by the said external force. Therefore, the other mounting portion 13b described above is more reliably prevented from being damaged by the external force.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Car body 3 Car interior 4 Rear wall 6 Back door apparatus 9 Door opening 10 Door 13 Inner panel 13a Mounting part 13b Other mounting part 13c Part 15 Outer panel 21 Space 23 Pivoting tool 24 Stopper 25 Stopper 28 Reinforcing plate 30 Fastening tool DESCRIPTION OF SYMBOLS 31 Fixed side member 32 Fastener 33 Rotating side member 34 Axial center 35 Pivot shaft 38 Damper stage 39 Upper universal joint 40 Lower universal joint 41 Fastener 43 Projection body 44 Fastener 45 Reinforcement material 48 Fastener 49 Fastener 50 Reinforcing bar A upward rotation B downward rotation

Claims (1)

A door opening formed on the rear wall of the vehicle body, a resin inner and an outer panel so as to have a hollow closed cross-sectional structure, and a back door that closes the door opening so that it can be opened and closed, and a lower side of the door upward at the rear side of the rear wall, a pair of left and right pivot支具the upper end portion of the door so as to be capable pivoted downward to pivot the upper portion of the rear wall, extending vertically, its upper end the attached to the rear wall, the back door apparatus for a vehicle and a Danpasute the lower end is attached to the inner panel,
A projecting member which projects integrally from the rear surface of the upper vicinity of the mounting portion of the lower end portion of the Danpasute in the inner panel, one end is attached to the mounting portion, the other end portion side to the projecting end of the projecting member A back door device for a vehicle, comprising: a reinforcing member to be attached.

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