JP2020011666A - Backdoor structure of automobile - Google Patents

Abstract

To prevent the deformation and damage of a garnish arranged at a rear surface lower part of a backdoor main body of a backdoor.SOLUTION: An ornamental garnish 13 extending in a vehicle width direction is fixed to a rear surface lower part of a backdoor main body 12 for opening and closing a rear opening of a vehicle body, both end parts of the garnish in the vehicle width direction are made to face left and right vehicle-width direction inside protrusions 15 formed at a vehicle body rear part, a part of the backdoor main body which is heavy in weight is reduced in weight by the garnish, and a degree of freedom of the design of a vehicle body rear surface can be enhanced compared with the case that the vehicle-width direction inside protrusions are formed at the backdoor side. Both the end parts of the garnish in the vehicle width direction comprise an upper-side protrusion surrounding upper parts of vehicle-width direction inner edges of the vehicle-width direction inside protrusions, and a lower-side protrusion surrounding lower parts of the vehicle-width direction inner edges of the vehicle-width direction inside protrusions. Since a reinforcing plate 18 is overlapped on at least a front face of the lower-side protrusion, the garnish is not deformed nor damaged even if the backdoor is opened and closed by gripping a portion of the garnish by hand.SELECTED DRAWING: Figure 4

Description

  According to the present invention, a decorative garnish extending in the vehicle width direction is fixed to a lower portion of a rear surface of a back door body that opens and closes a rear opening of a vehicle body, and a vehicle width of the garnish is provided on left and right vehicle width direction inner protrusions provided at the rear portion of the vehicle body. The present invention relates to a back door structure of an automobile facing both ends in a direction.

  2. Description of the Related Art A garnish made of a synthetic resin for decoration is fixed to a lower portion of a rear surface of a back door body that opens and closes a rear opening of a vehicle body of an automobile.

JP 2014-210250 A

  By the way, although the back door of the automobile is provided with an opening / closing handle, there is a case where the opening / closing is performed by holding the outer end in the vehicle width direction below the back door body without using the opening / closing handle. In this case, if a synthetic resin garnish for decoration is fixed to the lower rear part of the back door body, the synthetic resin garnish may be deformed when opening and closing the back door by holding the garnish part by hand. It may be damaged.

  The present invention has been made in view of the above circumstances, and has as its object to prevent deformation and damage of a garnish provided on a lower portion of a rear surface of a back door body of a back door.

  According to the first aspect of the present invention, a decorative garnish extending in the vehicle width direction is fixed to a lower portion of a rear surface of a back door body that opens and closes a rear opening of a vehicle body. A back door structure of a vehicle in which both ends in the vehicle width direction of the garnish face the provided left and right vehicle width direction inner protrusions, wherein both ends of the garnish in the vehicle width direction are formed of the vehicle width direction inner protrusion. An upper protrusion protruding outward in the vehicle width direction so as to surround an upper portion of the inner edge in the vehicle width direction; and a lower protrusion protruding outward in the vehicle width direction so as to surround a lower portion of the inner edge in the vehicle width direction of the vehicle width direction inner protrusion. And a back plate structure for an automobile, wherein a reinforcing plate is overlapped with at least a front surface of the lower protruding portion.

  According to the second aspect of the present invention, in addition to the configuration of the first aspect, the garnish is configured such that the reinforcing plate is fastened to a bag-like portion in the vehicle width direction into which the reinforcing plate is inserted. A back door structure for an automobile, comprising a fastening portion on the inner side in the vehicle width direction, is proposed.

  According to the third aspect of the present invention, in addition to the configuration of the second aspect, the fastening portion attaches a component to the first mounting seat for attaching the garnish to the back door body or the garnish. Back door structure for an automobile, characterized in that it is a second mounting seat for the vehicle.

  According to a fourth aspect of the present invention, in addition to the configuration of the second aspect, a rib is provided on an inner surface of the bag-shaped portion for abutting on the reinforcing plate for positioning. A door structure is proposed.

  According to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect, a back door structure for a vehicle is proposed, wherein the rib is directed to an opening of the bag-shaped portion.

  According to the invention described in claim 6, in addition to the configuration of claim 2, a back door structure for an automobile is provided, wherein the bag-shaped portions are provided at upper and lower portions of the garnish, respectively. You.

  According to the invention described in claim 7, in addition to the configuration of claim 3, the first mounting seat protrudes forward from the garnish, and a sealing member is provided between an upper end of the garnish and the back door body. Is provided, and a back door structure for a vehicle is proposed.

  According to the invention described in claim 8, in addition to the configuration of claim 1, the lower edge of the reinforcing plate abuts on a folded flange obtained by folding the lower part of the garnish forward, and the reinforcing plate is folded back. An automobile having a bulging portion bulging forward above a flange, and a nut to which a bolt for fastening the reinforcing plate to the back door body is screwed is provided on a rear surface of the bulging portion. Is proposed.

  According to the ninth aspect of the present invention, in addition to the configuration of the first aspect, the back door body includes an annular closed-section skeleton in which an outer panel and an inner panel are connected, and a lower portion of the closed-section skeleton is provided. A back door structure for an automobile, wherein the garnish is attached, is proposed.

  According to a tenth aspect of the present invention, in addition to the configuration of the first aspect, the garnish includes an arc-shaped concave portion surrounded by the upper protruding portion and the lower protruding portion. A back door structure for an automobile is proposed.

  Note that the first mounting seat 19 and the second mounting seat 13h of the embodiment correspond to the fastening portion of the present invention, the fog lamp 14 of the embodiment corresponds to the component of the present invention, and the combination lamp 15 of the embodiment The weld nut 22 according to the embodiment corresponds to the nut according to the invention, and the foam seal member 32 according to the embodiment corresponds to the seal member according to the invention.

  According to the configuration of claim 1, a decorative garnish extending in the vehicle width direction is fixed to a lower portion of a rear surface of the back door body that opens and closes a rear opening of the vehicle body, and is provided on left and right vehicle width direction inward projections provided at the vehicle rear portion. Since the garnish faces both ends in the vehicle width direction, a part of the heavy backdoor body is made of garnish to reduce the weight, but compared to the case where the vehicle width direction inner protrusion is provided on the backdoor side. The degree of freedom in designing the rear surface of the vehicle body can be increased. Both ends of the garnish in the vehicle width direction are an upper protrusion projecting outward in the vehicle width direction so as to surround an upper portion of the vehicle width direction inner edge of the vehicle width direction inner protrusion, and a vehicle width direction inner edge of the vehicle width direction inner protrusion. A lower protruding portion that protrudes outward in the vehicle width direction so as to surround the lower portion, and a reinforcing plate is overlapped with at least the front surface of the lower protruding portion, so that the garnish is reinforced with the reinforcing plate, and the garnish portion is manually handled. The garnish is not deformed or damaged even when the back door is opened and closed.

  According to the second aspect of the present invention, the garnish includes the bag-shaped portion on the outer side in the vehicle width direction into which the reinforcing plate is inserted, and the fastening portion on the inner side in the vehicle width direction to which the reinforcing plate is fastened. Even if there is a difference in the amount of thermal expansion between the plates, there is no possibility that the garnish is warped and deformed.

  According to the third aspect of the present invention, since the fastening portion is the first mounting seat for mounting the garnish to the back door main body or the second mounting seat for mounting components to the garnish, the size of the reinforcing plate is increased. There is no need to do so, and the weight can be reduced.

  According to the fourth aspect of the present invention, the rib is provided on the inner surface of the bag-shaped portion so as to be in contact with the reinforcing plate, so that it is possible to prevent the reinforcing plate from rattling during running of the automobile and to generate noise. Instead, the garnish can be reinforced with ribs to increase strength, and deformation of the garnish can be prevented even when the vicinity of the bag-shaped portion is held by hand when the back door is opened and closed.

  According to the fifth aspect of the present invention, since the rib is directed to the opening of the bag-shaped portion, the reinforcing plate can be easily inserted into the bag-shaped portion, and the assembling workability is improved.

  According to the sixth aspect of the present invention, the upper and lower portions of the garnish are provided with the bag-shaped portions, respectively, so that the upper bag-shaped portion prevents the garnish from being warped and the lower bag-shaped portion opens and closes the back door. Strength against load can be ensured.

  According to the configuration of claim 7, the first mounting seat protrudes forward from the garnish, and the sealing member is disposed between the upper end of the garnish and the back door main body, so that the components are stored between the garnish and the back door main body. In addition to ensuring a space for water, the sealing member can prevent water from entering the space.

  According to the eighth aspect of the present invention, the lower edge of the reinforcing plate abuts against the folded flange obtained by folding the lower part of the garnish forward, and the reinforcing plate has a bulging portion bulging forward above the folded flange. A nut for screwing the bolt to fasten the plate to the back door body is provided on the rear surface of the bulging part, so not only can the reinforcing plate be positioned with the folded flange to improve the assembly workability, but also the bolt Garnish can be easily and reliably fastened to the back door body integrally with the reinforcing plate.

  According to the ninth aspect of the present invention, the back door body includes the annular closed-section skeleton in which the outer panel and the inner panel are connected, and the garnish is attached to a lower portion of the closed-section skeleton. By increasing the strength, the stiffness of the garnish with respect to the back door body can be increased.

  According to the tenth aspect of the present invention, the garnish has an arc-shaped concave portion surrounded by the upper protruding portion and the lower protruding portion, so that the garnish surrounds the vehicle width direction inner portion of the round vehicle width direction inner protruding portion. Can be arranged.

It is a perspective view which shows the back surface of the back door of a motor vehicle. FIG. 2 is a perspective view (a perspective view showing a front surface of a back door) of FIG. FIG. 3 is a view in the direction of arrows in FIG. 2 (a front view of the garnish). FIG. 3 is a view in the direction of arrows in FIG. 2 (rear view of the back door body). FIG. 5 is an enlarged view of a portion 5A and a portion 5B in FIG. 3. FIG. 6 is an enlarged sectional view taken along lines 6A-6A and 6B-6B of FIG. 3. FIG. 7 is an enlarged sectional view taken along line 7-7 of FIG. 3. FIG. 8 is an enlarged sectional view taken along line 8-8 of FIG. 3. FIG. 9 is an enlarged sectional view taken along line 9-9 of FIG. 3. FIG. 10 is an enlarged sectional view taken along line 10-10 of FIG. 3.

  An embodiment of the present invention will be described below with reference to FIGS. Note that the front-rear direction, the left-right direction (vehicle width direction), and the up-down direction in this specification are defined with reference to an occupant seated in a driver's seat.

  As shown in FIG. 1, a back door 11 that opens and closes an opening at a rear portion of a vehicle body of an automobile opens and closes a back door body 12 made of a steel plate whose upper end is pivotally supported by the vehicle body and a lower rear surface of the back door body 12. And a decorative garnish 13 formed in a plate shape from a synthetic resin such as ABS or polypropylene. A window 12a into which the door glass fits is formed in the center of the back door body 12, and fog lamps 14 are provided on both sides in the vehicle width direction of the garnish 13, and formed at both ends in the vehicle width direction of the garnish 13. The left and right combination lamps 15 (inwardly projecting portions in the vehicle width direction) provided on the rear portion of the vehicle body are in contact with the semicircular concave portion 13a.

  As shown in FIG. 2, the back door body 12 includes an outer panel 16 having a rectangular opening having the same shape as the window 12a, and an inner panel 17 having a pentagonal opening slightly larger than the window 12a. Only the triangular portion facing the lower side of the window portion 12a is a single plate of the outer panel 16, and the other portion is formed as a hollow closed section by the outer panel 16 and the inner panel 17.

  As shown in FIGS. 2 to 4, a reinforcing plate 18 made of a metal plate is fixed between both ends in the vehicle width direction of the garnish 13 and both ends in the vehicle width direction below the back door body 12. Is done. The end of the garnish 13 in the vehicle width direction includes an upper protruding portion 13b and a lower protruding portion 13c surrounding the semicircular concave portion 13a, in which the semicircular concave portion 18a of the reinforcing plate 18 at the vehicle width direction end is provided. Are overlapped with each other. The lower end of the back door body 12 has a slightly smaller dimension in the vehicle width direction, from which the lower protruding portion 18c of the reinforcing plate 18 and the lower protruding portion 13c of the garnish 13 protrude outward in the vehicle width direction.

  The upper and lower protruding portions 13b and 13c of the garnish 13 are formed with bag-like portions 13d and 13e which are opened inward in the vehicle width direction. The inner surface of the lower bag-like portion 13e extends in the vehicle width direction. A large number of extending linear ribs 13f are protruded (see FIGS. 3 and 5B). A foldback flange 13g that is folded forward is formed at the lower edge of the garnish 13, and the lower edge of the reinforcing plate 18 is locked to the foldback flange 13g (FIGS. 3, 5B and (See FIG. 7).

  A first mounting seat 19 formed of a synthetic resin in a plate shape is fixed along the upper edge of the garnish 13 by bonding, and an upper portion of a reinforcing plate 18 is overlapped on the front surface of the first mounting seat 19 to reinforce from the front. The reinforcing plate 18 is fastened to the garnish 13 by screwing a tapping screw 20 penetrating the plate 18 to the first mounting seat 19 (see FIGS. 3 and 7). Further, a second mounting seat 13h projects forward from a lower portion of the garnish 13, and a lower portion of the reinforcing plate 18 is superposed on the front surface of the second mounting seat 13h. The reinforcing plate 18 is fastened to the garnish 13 by screwing into the mounting seat 13h (see FIG. 3). At this time, the reinforcing plate 18 is positioned with respect to the garnish 13 by fitting the lower edge of the reinforcing plate 18 to the folded flange 13g on the lower edge of the garnish 13 (see FIG. 7).

  In the upper and lower portions of the reinforcing plate 18, bulging portions 18d and 18e bulging forward are formed, and a weld nut 22 is provided in a space behind the bulging portions 18d and 18e (FIG. 3, FIG. 4, 6 and 7).

  As shown in FIG. 3, FIG. 4, and FIG. 8 to FIG. 10, the fog lamp 14 includes a box-shaped case 23 for storing the lamp therein, and a lens 24 provided on a rear surface of the case 23. A projection 24a that projects rearward from the center of the garnish 13 and that fits into the opening 13i of the garnish 13 exposes the rear of the vehicle body to be illuminated.

  Four brackets 23a to 23d protrude outward from the outer periphery of the case 23 of the fog lamp 14, a circular screw hole 23e is formed in the bracket 23a, and a U-shaped bolt groove 23f is formed in the bracket 23b. A circular screw hole 23g and a U-shaped bolt groove 23h are formed in 23c, and a circular screw hole 23i and a U-shaped bolt groove 23j are formed in the bracket 23d. Nuts 25 are respectively provided on the rear surfaces of the three bolt grooves 23f, 23h, 23j.

  In the fog lamp 14 having such a structure, the upper and lower edges of the lens 23 are temporarily fixed to the upper and lower edges of the opening 13 i of the garnish 13 by the double-sided tape 26. Then, three tapping screws 27 penetrating the three screw holes 23e, 23g, 23i of the case 23 of the fog lamp 14 are screwed into the front surface of the garnish 13 and the first and second mounting seats 194, 13h of the garnish 13. By combining, the case 23 of the fog lamp 14 is permanently fixed to the garnish 13.

  Then, a bolt 28 penetrating the upper part of the back door body 12 and the reinforcing plate 18 is screwed into the weld nut 22 (see FIGS. 3, 5A and 6A), and the lower part of the back door body 12 is By screwing a bolt 29 passing through the reinforcing plate 18 to the weld nut 22 (see FIGS. 3, 5 (B), 6 (B) and 7), the reinforcing plate 18 and the garnish 13 are attached to the back door body. 12 is fastened. Furthermore, the garnish 13 is fastened to the back door body 12 by fastening the outer panel 16 on the upper part of the back door body 12 to the first mounting seat 19 with a plurality of clips 30 (see FIGS. 3 and 8).

  In this state, the gap between the upper end of the garnish 13 and the rear surface of the outer panel 16 of the back door body 12 with which the garnish 13 abuts is sealed by the foam sealing member 32, and the fog lamp 14 is partitioned between the garnish 13 and the outer panel 16. Water is prevented from entering the space to be stored (see FIGS. 3, 5A and 7 to 9).

  When the garnish 13 is fastened to the back door main body 12 in this manner, three bolts penetrating through the three bolt grooves 23f, 23h, and 23j of the outer panel 16 of the back door main body 12 and the case 23 of the fog lamp 14 are provided. The fog lamp 14 is completely fixed to the outer panel 16 by screwing the 31 into the nut 25 of the case 23 through the working opening 17a formed in the inner panel 17 (see FIGS. 3 and 9).

  Next, the operation of the embodiment of the present invention having the above configuration will be described.

  An ornamental garnish 13 that is superimposed on a lower portion of the back surface of the back door body 12 of the back door 11 includes an upper protruding portion 18b that protrudes outward in the vehicle width direction so as to surround an upper portion of the inner edge of the combination lamp 15 in the vehicle width direction. A lower protruding portion 18c protruding outward in the vehicle width direction so as to surround a lower portion of the inner edge of the ramp 15 in the vehicle width direction, and a reinforcing plate 18 made of a metal plate is provided in front of the upper protruding portion 18b and the lower protruding portion 18c. The garnish 13 made of synthetic resin is reinforced by the reinforcing plate 18 to prevent the garnish 13 from being deformed or damaged even when the garnish 13 is gripped and the back door 11 is opened and closed. Not only can a part of the heavy steel backdoor body 12 be made of synthetic resin garnish By configuring in 3, it is possible to reduce the weight of the rear hatch main body 12.

  Moreover, by providing the combination lamp 15 at the rear part of the vehicle body, not only can the degree of freedom of design be increased as compared with the case where the combination lamp 15 is provided at the back door 11 side, but also the garnish 13 has the upper projecting part 18b and the lower projecting part 18c. The garnish 13 can be disposed so as to surround the inner edge of the round combination lamp 15 in the vehicle width direction because the circular arc-shaped concave portion 13a is provided.

  Bag-like portions 13d and 13e into which the reinforcing plate 18 is inserted are formed on the front side of the garnish 13 in the vehicle width direction, and the upper protruding portion 18b and the lower protruding portion 18c of the reinforcing plate 18 are formed on the bag-like portions 13d and 13e. And the reinforcing plate 18 is fastened to the first mounting seat 19 and the second mounting seat 13h protruding from the front side of the garnish 13 in the vehicle width direction by the tapping screws 20, 21. Even if there is a difference in the amount of thermal expansion between the garnish 13 and the metal reinforcing plate 18, the difference in the amount of thermal expansion is determined by the upper protruding portion 18 b and the lower protruding portion 18 c of the reinforcing plate 18 with respect to the bag-like portions 13 d and 13 e. Can be absorbed by the relative movement of

  Further, the reinforcing plate 18 is fixed to the garnish 13 by using the first mounting seat 19 for mounting the garnish 13 to the back door body 12 and the second mounting seat 13h for mounting the fog lamp 14 to the garnish 13. There is no need to provide a special mounting seat on the plate 18, and the weight of the reinforcing plate 18 can be reduced. In addition, since the rib 13f which is positioned in contact with the reinforcing plate 18 is provided on the inner surface of the lower bag-like portion 13e on the lower side of the garnish 13, it is possible to prevent the reinforcing plate 18 from rattling while the automobile is running, thereby preventing noise from being generated. Instead, the garnish 13 is reinforced by the ribs 13f to increase the strength, and the garnish 13 can be prevented from being deformed even if the vicinity of the lower bag-shaped portion 13e is gripped when the back door 11 is opened and closed.

  In particular, since the rib 13f is formed in the vehicle width direction so as to be directed to the opening of the lower bag-like portion 13e, the reinforcing plate 18 can be easily inserted into the lower bag-like portion 13e, and the assembling work is performed. The performance is improved. Moreover, since the garnish 13 is provided with the bag-shaped portions 13d and 13e at the upper portion and the lower portion, respectively, the upper bag-shaped portion 13d prevents the garnish 13 from warping, and the lower bag-shaped portion 13e opens and closes the back door 11. Can secure the strength against the load.

  Further, since the first mounting seat 19 projects forward from the garnish 13, not only can a space for accommodating the fog lamp 14 be provided between the garnish 13 and the outer panel 16 of the back door body 12, but also the upper end of the garnish 13 and the outer panel 16 can be secured. Since the foam sealing member 32 is disposed between the fog lamp 14 and the space, the foam sealing member 32 can prevent water from entering the space accommodating the fog lamp 14.

  Further, the back door body 12 has an annular closed-section skeleton in which the outer panel 16 and the inner panel 17 are connected, and the garnish 13 is attached to a lower portion of the closed-section skeleton, so that the strength of the back door body 12 is increased by the closed-section skeleton. As a result, when the garnish 13 is gripped and the back door 11 is opened and closed, deformation and damage of the back door main body 12 can be prevented.

  The lower edge of the reinforcing plate 18 abuts against a folded flange 13g obtained by folding the lower part of the garnish 13 forward. The reinforcing plate 18 has a bulging portion 18e that bulges forward above the folded flange 13g. Since the weld nut 22 into which the bolt 29 for fastening to the back door body 12 is screwed is provided on the rear surface of the bulging portion 18e, the reinforcing plate 18 can be positioned by the folded flange 13g to improve the assembling workability. Instead, by screwing the bolt 29 to the weld nut 22, the garnish 13 can be easily and reliably fastened to the back door body 12 integrally with the reinforcing plate 18.

  Further, the fog lamp 14 arranged in the space defined between the back door body 12 and the garnish 13 is fixed to the garnish 13 with three tapping screws 27, and the outer panel 16 of the back door body 12 is fastened with three bolts 31. , So that not only can the fog lamp 14 be firmly supported without giving the garnish 13 a special shape such as a crank-shaped cross section, but also because the back door body 12 and the garnish 13 are interconnected via the fog lamp 14, The rigidity of the back door body 12 and the garnish 13 is increased by the fog lamps 14.

  Further, since the fog lamp 14 is temporarily fixed to the garnish 13 with the double-sided tape 26, the workability when the fog lamp 14 is permanently fixed to the garnish 13 with the three tapping screws 27 can be improved. The fixing strength can be increased.

  Further, since the inner panel 17 of the back door body 12 has the working opening 17a, the operation of the three bolts 31 for fastening the fog lamp 14 to the outer panel 16 can be performed without trouble through the working opening 17a of the inner panel 17. Can be.

  Further, since the convex portion 24a of the lens 24 of the fog lamp 14 fits into the opening 13i of the garnish 13, the lens 24 of the fog lamp 14 can be positioned with respect to the garnish 13 with high accuracy.

  The embodiments of the present invention have been described above. However, various design changes can be made in the present invention without departing from the gist thereof.

  For example, in the embodiment, the reinforcing plate 18 is superimposed on the upper protruding portion 13b and the lower protruding portion 13c of the garnish 13, but the reinforcing plate 18 only needs to be superposed on at least the lower protruding portion 13c.

  Further, the component of the present invention is not limited to the fog lamp 14 of the embodiment.

  In the embodiment, the first mounting seat 19 is formed as a separate member from the garnish 13. However, the first mounting seat 19 may be formed integrally with the garnish 13, or the second mounting seat 13 h may be formed integrally with the garnish 13. However, it may be configured as a separate member from the garnish 13.

  Further, the seal member of the present invention is not limited to the foam seal member 32 of the embodiment.

  In addition, the vehicle width direction inner side protruding portion of the present invention is not limited to the combination lamp 15 of the embodiment, and a part of the bumper face and a part of the outer panel 16 of the back door body 12 are protruded inward in the vehicle width direction. Part.

12 back door body 13 garnish 13a recess 13b upper protruding portion 13c lower protruding portion 13d bag-like portion 13e bag-like portion 13f rib 13g folded flange 13h second mounting seat (fastening portion)
14 Fog lights (parts)
15 Combination lamp (vehicle width direction inside protrusion)
16 outer panel 17 inner panel 18 reinforcing plate 18e bulging part 19 first mounting seat (fastening part)
22 Weld nut (nut)
29 bolt 32 foam sealing member (seal member)

Claims (10)

A decorative garnish (13) extending in the vehicle width direction is fixed to a lower portion of a rear surface of a back door body (12) that opens and closes a rear opening of the vehicle body, and is provided on left and right vehicle width direction inner protrusions (15) provided at the vehicle rear portion. A back door structure of an automobile facing both ends in the vehicle width direction of the garnish (13),
Both ends of the garnish (13) in the vehicle width direction have upper side protruding portions (13b) protruding outward in the vehicle width direction so as to surround an upper portion of an inner edge of the vehicle width direction inner protruding portion (15) in the vehicle width direction; A lower protruding portion (13c) protruding outward in the vehicle width direction so as to surround a lower portion of an inner edge of the vehicle width direction inner protruding portion (15), at least on a front surface of the lower protruding portion (13c). A back door structure for an automobile, wherein a reinforcing plate (18) is overlapped.   The garnish (13) has a bag-like portion (13d, 13e) on the outside in the vehicle width direction into which the reinforcing plate (18) is inserted, and a fastening portion on the vehicle width direction inside to which the reinforcing plate (18) is fastened. 19. The backdoor structure for a motor vehicle according to claim 1, further comprising: (19, 13h).   The fastening portion (19, 13h) is used for attaching a component (14) to the first mounting seat (19) for attaching the garnish (13) to the back door body (12) or the garnish (13). The back door structure for an automobile according to claim 2, characterized in that it is a second mounting seat (13h).   The backdoor structure of an automobile according to claim 2, wherein a rib (13f) is provided on an inner surface of the bag-shaped portion (13e) for abutting and positioning the reinforcing plate (18).   The vehicle backdoor structure according to claim 4, wherein the rib (13f) is directed to an opening of the bag-shaped portion (13e).   The back door structure of an automobile according to claim 2, wherein the bag-shaped portions (13d, 13e) are provided at upper and lower portions of the garnish (13), respectively.   The first mounting seat (19) protrudes forward from the garnish (13), and a seal member (32) is disposed between an upper end of the garnish (13) and the back door body (12). The back door structure for an automobile according to claim 3, wherein   The lower edge of the reinforcing plate (18) abuts against a folded flange (13g) obtained by folding the lower part of the garnish (13) forward, and the reinforcing plate (18) expands forward above the folded flange (13g). A nut (22) to which a bolt (29) for fastening the reinforcing plate (18) to the back door body (12) is screwed is provided. The back door structure for an automobile according to claim 1, wherein the back door structure is provided on a rear surface of the vehicle.   The back door body (12) has an annular closed-section skeleton in which an outer panel (16) and an inner panel (17) are connected, and the garnish (13) is attached to a lower portion of the closed-section skeleton. The backdoor structure for an automobile according to claim 1.   The back of a car according to claim 1, characterized in that the garnish (13) comprises an arc-shaped recess (13a) surrounded by the upper protrusion (13b) and the lower protrusion (13c). Door structure.