JP2007038768A - Upper rail mounting part structure of sliding door type automobile and its assembling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an upper rail mounting structure of a sliding door type automobile improving durability and reliability by holding a favorable getting-on-and-off property without decreasing height of a sliding door opening part, reducing mandays by improving mounting precision of an upper rail and simplifying welding work and reducing welding stress and its assembling method. <P>SOLUTION: This upper rail mounting part of the sliding door type automobile is constituted by connecting the upper rail mounting part 10 on which the upper rail 8 to guide a sliding door to a side body outer panel 4 and a side body inner panel 5, an upper cover 7 constituting an upper part of the upper rail mounting part 10 and a lower cover 6 constituting a lower part are separately manufactured and the upper cover 7 is welded and connected to the side body outer panel 5 by fixing the upper rail 8 on a lower surface of the upper cover 7 before connecting the side body outer panel 4 and the side body inner panel 5 to each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is applied to a sliding door type automobile, and is an upper part of a sliding door type automobile configured by connecting an upper rail mounting portion to which an upper rail for guiding the sliding door is mounted to a side body outer panel and a side body inner panel. The present invention relates to a rail mounting portion structure and an assembling method thereof.

FIG. 1 shows a side view of a vehicle body of a sliding door type automobile. 6 is a cross-sectional view of the upper rail mounting portion (a cross-sectional view taken along line AA in FIG. 1).
As shown in FIG. 1, in a sliding door type automobile, in order to guide a sliding door that moves in the front-rear direction of the vehicle body 100, three rails that extend along the front-rear direction of the vehicle body, that is, the sliding door opening 2 are provided. An upper rail 8 attached to the upper upper rail attaching portion, a center rail 18 attached to the rear panel of the sliding door opening 2 and a lower rail 28 attached to the lower panel of the sliding door opening 2 are provided.

Of these, the upper rail 8 has a shape that enters the vehicle inside toward the front of the vehicle, and therefore, as shown in FIG. 6, the upper rail mounting portion 200 is depressed inside the vehicle. It has a shape. Conventionally, the upper rail mounting portion 200 has a substantially trapezoidal cross-sectional shape in which the opening height dimension C1 on the door side is larger than the height dimension on the back side.
That is, in FIG. 6, 3 is a roof panel, 4 is a side body outer panel, 5 is a side body inner panel, 21 is a drip rail, and 20 is a cover constituting the depressed shape of the upper rail mounting portion 200. As described above, 20 is integrally formed in a substantially trapezoidal cross-sectional shape.

The cover 20 is continuous with the upper wall 20a, the lower wall 20b, the vertical wall 20c positioned between the inner end of the upper wall 20a and the inner end of the lower wall 20b, and the outer end of the upper wall 20a. A flange portion 20d formed continuously with the outer end portion of the lower wall 20b. The flange portion 20d is welded to the side body outer panel 4, and the flange portion 20e The body outer panel 4 and the side body inner panel 5 are welded together.
The upper rail 8 is joined to the vertical wall 20c of the cover 20 by spot welding S.

The upper part of the sliding door type automobile in which the cover constituting the upper rail mounting portion on which the upper rail for guiding the sliding door is mounted is recessed in the vehicle, and the upper rail for guiding the sliding door is mounted on the cover. A rail mounting structure is provided by Patent Document 1, Patent Document 2, and the like.
Japanese Utility Model Publication No. 58-172684 No. 7-37956

However, the conventional upper rail mounting structure shown in FIG. 6 has the following problems to be solved.
That is, in the above prior art, since the shape of the cover 20 in the upper rail mounting portion 200 is a shape recessed on the vehicle inner side, in order to improve the workability when the cover 20 is pressed, FIG. As shown in (B), the outer end portion of the lower wall 20b of the cover 20 is lowered, and the opening on the door side of the cover 20 is widened in the vehicle height direction (inlet height C1) as shown by the broken line in the figure. It was necessary to have a trapezoidal cross-sectional shape.
As a result, the height D1 of the sliding door opening 2 used for getting into and out of the vehicle has to be lowered, and the sliding door opening 2 becomes smaller in the height direction, affecting the boarding / exiting performance. .

  Further, in the above prior art, the flange portion formed at the outer end portion of the cover 20 out of one cover 20 formed in a substantially trapezoidal cross-sectional shape when the upper rail mounting portion is assembled. 20d is welded to the side body outer panel 4 and the flange portion 20e is welded to the side body inner panel 5, so that the degree of freedom of the welding position is reduced and the mounting accuracy of the upper rail 8 is likely to be lowered. The number of welding operations is increased, and both end flange portions 20d and 20e of one cover 20 are constrained by welding. Therefore, the above-described restraint is applied to the welded portion between the cover 20, the side body outer panel 4 and the side body inner panel 5. There has been a problem that welding stress due to is easily generated.

  On the other hand, in Patent Document 1 and Patent Document 2, an upper rail that guides the slide door to the cover is formed in a shape in which the cover that constitutes the upper rail mounting portion to which the upper rail that guides the slide door is mounted is recessed inside the vehicle. Only the means for mounting is shown, and no means for solving the above two problems is disclosed.

  The present invention has been made in view of such a situation, and the object thereof is to make it possible to configure an upper rail mounting portion that is depressed inside the vehicle without reducing the height of the sliding door opening, and to have good boarding / exiting characteristics. In addition, it improves the accuracy of upper rail mounting at the upper rail mounting part, simplifies the welding work to reduce the welding man-hours, and further reduces the welding stress at the upper rail mounting part to improve durability and reliability. It is an object of the present invention to provide an improved structure of an upper rail mounting portion of a sliding door type automobile and an assembling method of the upper rail mounting portion.

  In order to solve the problems of the prior art, the present invention forms a side opening that is opened and closed by a sliding door by a side body outer panel and a side body inner panel that constitute a side panel of a vehicle body, and the sliding door An upper rail mounting portion structure of a sliding door type automobile, in which an upper rail mounting portion to which an upper rail for guiding the vehicle is mounted is connected to the side body outer panel and the side body inner panel, wherein the upper rail mounting portion is An upper cover that is welded to the side body outer panel and to which the upper rail is fixed is welded to a lower cover that is welded to the side body inner panel.

  In the present invention, the upper cover includes a flange portion that is welded to the side body outer panel, and an upper wall that is connected to the flange portion and extends to the inside of the vehicle body, and the upper rail is fixed to the lower surface. The lower cover includes a flange portion welded and joined to the side body inner panel, and a lower wall continuously connected to the flange portion and extending inward of the vehicle body, and an inner end portion of the upper wall of the upper cover; The inner end of the lower wall of the lower cover is welded.

  In the present invention, an inner end portion of the upper wall of the upper cover is bent downward to form a vertical wall, and an inner end portion of the lower wall of the lower cover is bent upward to form a vertical wall. The vertical wall on the cover side and the vertical wall on the lower cover side are overlapped and welded so that the vertical wall on the upper cover side is on the outside of the vehicle, and the upper rail mounting portion is opened to the outside of the vehicle body. The cross section is formed.

  Further, in the present invention, the upper cover includes a flange portion welded to the side body outer panel, an upper wall that is connected to the flange portion and has the upper rail fixed to the lower surface, and an inner end of the upper wall. A vertical wall extending downward from the lower cover and welded to the lower cover, and a stopper member abutting against a locking member provided on the slide door is fixed to the upper wall and the vertical wall of the upper cover. is doing.

The present invention also relates to a method for assembling the upper rail mounting portion of the sliding door type automobile configured as described above,
A side body outer panel and a side body inner panel that form a side panel of the vehicle body form a side opening that is opened and closed by a sliding door, and an upper rail mounting portion to which an upper rail that guides the sliding door is mounted is defined as the side rail. A method for assembling an upper rail mounting portion of a sliding door type automobile connected to a body outer panel and a side body inner panel, wherein an upper cover constituting an upper portion of the upper rail mounting portion and a lower cover constituting a lower portion are provided. Before the side body outer panel and the side body inner panel are joined, the upper rail is fixed to the lower surface of the upper cover, and then the upper cover is welded to the side body outer panel. ing.

  In the present invention, before joining the side body outer panel and the side body inner panel, the lower cover is welded to the side body inner panel, and then the inner end of the lower cover is connected to the inner side of the upper cover. It is welded to the end.

  As described above, in the upper rail mounting portion structure and the upper rail mounting portion assembly method for a sliding door type automobile according to the present invention, the upper rail mounting portion is welded to the side body outer panel and the upper rail is fixed. By connecting the upper cover and the lower cover welded to the side body inner panel by welding, there is no need to increase the inlet height for pressing a single cover as in the prior art. The entrance rail height can be made smaller than that of the prior art by forming the upper rail mounting portion in a substantially U-shaped cross section that opens to the outside of the vehicle body. Therefore, the height of the sliding door opening can be made larger than that of the conventional structure, and the passengers can get on and off easily. Furthermore, by comprising an upper cover and a lower cover, the moldability and parts accuracy of the cover can be improved, the accuracy of the sliding door can be improved, and the smooth movement of the sliding door can be easily secured. .

  Further, according to the present invention, the upper cover constituting the upper part of the upper rail mounting portion and the lower cover constituting the lower part are separately manufactured, and before the side body outer panel and the side body inner panel are joined. Further, after fixing the upper rail to the lower surface of the upper cover, the upper cover is welded to the side body outer panel, the lower cover is welded to the side body inner panel, and the inner end of the lower cover is connected to the upper cover. Since the upper rail mounting part is assembled by welding to the inner end of the upper part, the welded joint between the upper cover with the upper rail fixed to the lower surface and the side body outer panel, and the welded joint between the lower cover and the side body inner panel Affect each other in the welding process And without it can be performed separately, the welding operation freedom spread of welding position in each of the weld joint becomes easy, thereby reducing the welding steps.

  Further, according to the present invention, the welded joint between the upper cover having the upper rail fixed to the lower surface and the side body outer panel, the welded joint between the lower cover and the side body inner panel, and the welding of the inner ends of the upper cover and the lower cover. Since the side body outer panel and the side body inner panel are welded and joined after joining, the direction of the weld joint between the side body outer panel and the side body inner panel becomes the vehicle width direction, improving the weldability. .

Further, according to the present invention, the welding of the upper rail to the lower surface of the upper cover can be performed independently without being affected by restraint or thermal deformation from the lower cover and the side body inner panel side. . Therefore, the mounting accuracy of the upper rail to the upper cover is increased, and the thermal deformation of the upper rail at the time of welding joining the upper rail to the upper cover can be suppressed, and the malfunction of the sliding door due to the thermal deformation of the upper rail is generated. Can be prevented.
In addition, according to the present invention, the welded joint between the upper cover and the side body outer panel with the upper rail fixed to the lower surface, and the welded joint between the lower cover and the side body inner panel affect each other by the welding joint work. Since the inner ends of the upper cover and the lower cover are welded to each other after being separately performed, the means for welding and joining both end flanges of one cover to the side body outer panel and the side body inner panel as in the prior art Compared to the above, the restraint of the weld joint and the welding stress due to the restraint are reduced.

  Further, according to the present invention, the vertical wall connected to the upper wall on the upper cover side and the vertical wall connected to the lower wall on the lower cover side are arranged such that the vertical wall on the upper cover side is on the vehicle outer side. Receiving the force applied to the upper cover through the stopper member that comes into contact with the locking member of the sliding door when the sliding door is opened and closed by the overlapping surface of the two vertical walls when the sliding door is opened and closed. Thus, the rigidity of the upper rail mounting portion can be improved, and the assembly cost of the upper rail mounting portion can be reduced by reducing the number of welding points during spot welding and simplifying the reinforcement.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.
FIG. 1 is a side view of a vehicle body of a sliding door type automobile to which an upper rail mounting portion structure according to an embodiment of the present invention is applied, and FIG. 2 is a cross-sectional view of the upper rail mounting portion according to the embodiment of the present invention (FIG. 1). AA line sectional view in FIG.
As shown in FIG. 1, the side of the vehicle body 100 of the sliding door type automobile according to the embodiment of the present invention is provided with three rails spaced apart vertically to guide the sliding door that moves in the longitudinal direction of the vehicle body. Is extended along the longitudinal direction of the vehicle body. That is, the sliding door type automobile includes an upper rail 8 attached to the upper rail attaching portion on the upper side of the sliding door opening 2, a center rail 18 attached to the rear panel of the sliding door opening 2, and the sliding door opening 2. Each has a lower rail 28 attached to the lower panel. Reference numeral 1 denotes a front door opening provided on the vehicle body front side of the sliding door opening 2, and 3 denotes a roof panel constituting the roof of the vehicle body 100.

The upper rail mounting portion 10 according to the embodiment of the present invention constitutes a characteristic portion of the present invention, and as shown in FIG. 2, the upper rail 8 enters the vehicle inside toward the front of the vehicle. Since it has such a shape, the upper rail mounting portion 10 has a shape recessed to the inside of the vehicle with respect to the side body of the vehicle.
The side panel of the vehicle body 100 includes a side body outer panel 4 and a side body inner panel 5.

The upper rail mounting portion 10 is welded and joined to the side body outer panel 4 and the upper cover 7 to which the upper rail 8 is fixed and the lower cover 6 to be welded to the side body inner panel 5. It is configured. That is, the cover of the upper rail mounting portion 10 is constituted by two cover members, the upper cover 7 and the lower cover 6.
The upper cover 7 is formed by bending an upper wall 7a to which the upper rail 8 is joined to the lower surface by spot welding S3, and an outer end portion of the upper wall 7a on the outer side of the vehicle body obliquely upward and inwardly. The flange portion 7d joined to the outer surface of the vehicle body by spot welding S4 and the vertical wall 7b formed by bending the inner end portion of the upper wall 7a on the center side of the vehicle body downward.
The lower cover 6 extends along the horizontal direction substantially parallel to the upper wall 7a of the upper cover 7, and a portion near the outer end is joined to the horizontal surface of the side body inner panel 5 by spot welding S1. A wall 6a and an outer end of the lower wall 6a on the outside of the vehicle body are bent downward and welded to the vehicle body outer surface of the side body inner panel 5, and the vehicle body outer surface of the side body inner panel 5 It is comprised by the flange part 6d pinched | interposed into the vehicle body inner surface of the side body outer panel 4, and welding, and the vertical wall 6b formed by bending the inner edge part which becomes the center side of the vehicle body of the lower wall 6a upwards. ing.

  The upper rail mounting portion 10 is formed by bending the inner end of the upper wall 7a of the upper cover 7 downward and the inner end of the lower wall 6a of the lower cover 6 upward. The vertical wall 6b is overlapped with the vertical wall 7b on the upper cover 7 side so as to be positioned outside the vehicle body and joined by spot welding S2, thereby forming a substantially U-shaped cross section that opens to the outside of the vehicle body. ing.

  The upper rail mounting portion 10 of the embodiment of the present invention includes an upper cover 7 that is welded to the side body outer panel 4 and the upper rail 8 is fixed to the lower surface, and a lower cover 6 that is welded to the side body inner panel 5. Therefore, it is not necessary to widen the inlet width like C1 for pressing a single cover as in the prior art shown by the broken line B in FIG. 2 (B). The upper rail mounting portion 10 is formed in a substantially U-shaped cross section that opens to the outside of the vehicle body as indicated by the solid line A, so that the entrance width C can be made smaller than that of the prior art, and the height D of the sliding door opening 2 can be reduced. In the case of the prior art, it can be made larger than D1. Thereby, a passenger | crew's boarding / alighting property improves.

The upper rail mounting portion 10 must receive the movement of the slide door, which is a relatively heavy object, and receives a force from the slide door when closing the slide door. The force from the sliding door is transmitted to the upper cover 7 via the upper rail 8 and a stopper 11 described later. At this time, since the flange portion 7d which becomes the vehicle body outer side of the upper cover 7 is overlapped with the vehicle body outer side of the side body outer panel 4 and joined by spot welding S4, it is possible to receive not only spot welding but also the surface. It is possible to reduce spot welding points and simplify reinforcement. Further, in spot welding S4, the drip rail 21 is overlapped and welded to the outside of the vehicle body of the flange portion 7d. That is, the flange portion 7d is sandwiched and welded between the side body outer panel 4 and the drip rail 21. As a result, the rigidity is further improved. The drip rail 21 is a bowl-shaped member that receives rainwater flowing from the roof panel 3 to the side of the vehicle and flows in the vehicle front-rear direction. The lower end of the roof panel 3 is overlapped and welded. .
Similarly, the flange portion 6d on the outer side of the lower cover 6 is overlapped with the outer side of the side body inner panel 5 and joined by spot welding. It is possible to reduce the number of welding points and simplify reinforcement. Furthermore, the strength and durability of the upper rail mounting part 10 can be improved and the welding operation can be facilitated, thereby improving productivity.
Further, as shown in FIG. 2, the lower portion including the flange portion 6d of the lower cover 6, the side body outer panel 4, and the side body inner panel 5 are overlapped and joined in a three-ply manner. At the time of opening and closing, the force applied to the joint through the stopper 11, the upper rail 8, and the upper cover 7 is received by the above-described three-layered surface, so that the rigidity of the upper rail mounting portion 10 is improved and the spot The assembling cost of the upper rail mounting part 10 can be reduced by reducing the number of welding points during welding or simplifying reinforcement.
Furthermore, since the lower wall 6a of the lower cover 6 is joined to the horizontal surface of the side body inner panel 5 by spot welding S1 adjacent to the three-layered portion, the lower portion of the lower cover 6 and the side body outer panel 4 and the side body inner panel 5 are provided with a closed cross-section forming portion, the rigidity of this portion is improved.

3 is a partially enlarged perspective view of the vicinity of the stopper portion of the slide door according to the embodiment of the present invention, FIG. 4 is a cross-sectional view taken along line BB in FIG. 3, and FIG. 5 is a cross-sectional view taken along line CC in FIG.
3 to 5, reference numeral 11 denotes a stopper that is brought into contact with a locking member (not shown) made of an elastic body provided on the slide door. The locking member on the sliding door side has a conical shape with a thin tip, and the stopper 11 has a hole for receiving the tip of the locking member. The peripheral edge of the hole is bent toward the front side of the vehicle (the side opposite to the locking member entry side). When the tip of the locking member on the sliding door side is inserted into the hole of the stopper 11, the sliding door and the vehicle body are engaged, and the movement of the sliding door upper rail 8 other than the sliding direction is restricted and the sliding door is closed. Positioning is performed.
As shown in FIGS. 4 and 5, the stopper plate 11 a constituting the stopper 11 is joined to the upper wall 7 a of the upper cover 7 by spot welding S 6 and spot welded to the vertical wall 7 b of the upper cover 7. Joined at S7.
As described above, the vertical wall 7b of the upper cover 7 and the vertical wall 6b of the lower cover 6 are overlapped and welded so that the vertical wall 7b on the upper cover 7 side is on the vehicle outer side.

In this way, the vertical wall 7b connected to the upper wall 7a on the upper cover 7 side and the vertical wall 6b connected to the lower wall 6a on the lower cover 6 side are arranged, and the vertical wall 7b on the upper cover 7 side is on the vehicle outer side. In this way, when the sliding door is opened and closed, the force applied to the upper cover 7 via the stopper 11 that is in contact with the locking member of the sliding door when the sliding door is opened and closed is set to the two vertical walls 6b, 7b, the rigidity of the upper rail mounting portion 10 is improved, and the assembling cost of the upper rail mounting portion 10 due to the reduction of the welding points during spot welding and the simplification of the reinforcement can be reduced.
Furthermore, since the stopper 11 is fixed to the upper wall 7a and the vertical wall 7b of the upper cover 7, the rigidity of the upper cover 7 is improved and the rigidity of the stopper 11 is also improved. Moreover, since the upper rail 8 and the stopper 11 are attached to the upper cover 7, the accuracy of the attachment position of the upper rail 8 and the stopper 11 is improved, and the sliding door can be easily and smoothly slid.

Next, a method for assembling the upper rail mounting portion according to the embodiment of the present invention will be described.
First, the upper cover 7 constituting the upper part of the upper rail mounting part 10 and the lower cover 6 constituting the lower part are separately manufactured.
And before joining the side body outer panel 4 and the side body inner panel 5, the upper rail 8 is joined to the lower surface of the upper cover 7 by spot welding S3, and then the flange portion 7d of the upper cover 7 is joined to the side body. The lower wall 6a of the lower cover 6 is joined to the outer panel 4 by welding to the side body inner panel 5 by spot welding S1, and the flange portion 6d of the lower cover 6 is attached to the side body inner panel 5 and the side body outer panel 4 3 Weld and join by stacking sheets.
Next, the vertical wall 7b of the upper cover 7 and the vertical wall 6b of the lower cover 6 are overlapped in the above-described form and joined by spot welding S2.

Since the upper rail mounting part 10 is assembled by the above method, the upper cover 7 having the upper rail 8 fixed to the lower surface and the welded connection between the side body outer panel 4 and the lower cover 6 and the side body inner panel 5 are welded. Joining can be performed separately without affecting the effects of the welding joint work, the degree of freedom of the welding position in each of the above weld joints is increased, the welding work is facilitated, and the number of welding work steps can be reduced.
Also, the welded joint between the upper cover 7 having the upper rail 8 fixed to the lower surface and the side body outer panel 4, the welded joint between the lower cover 6 and the side body inner panel 5, and the welded joint between the upper cover 7 and the lower cover 6 are performed. Since the side body outer panel 4 and the side body inner panel 5 are welded together, the side body outer panel 4 and the side body inner panel 5 are welded in the vehicle width direction, so that the welding workability is improved. improves.

Moreover, since it becomes possible to perform welding joining of the upper rail 8 to the lower surface of the upper cover 7 independently without being affected by restraint or thermal deformation from the lower cover 6 and the side body inner panel 5 side, The mounting accuracy of the upper rail 8 to the upper cover 7 is increased, and thermal deformation of the upper rail 8 at the time of welding joining the upper rail 8 to the upper cover 7 can be suppressed. Occurrence of malfunction can be prevented.
Furthermore, the welded joint between the upper cover 7 and the side body outer panel 4 with the upper rail 8 fixed to the lower surface, and the welded joint between the lower cover 6 and the side body inner panel 5 are not affected by the welding joint work. After performing separately, the inner ends of the upper cover 7 and the lower cover 6 are welded together, so that both end flange portions of one cover as in the prior art are welded to the side body outer panel 4 and the side body inner panel 5. Compared with the means for joining, the restraint of the weld joint and the welding stress due to such restraint are reduced.

  While the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

It is a side view which shows the vehicle body of the sliding door type motor vehicle to which the upper rail attachment part structure which concerns on embodiment of this invention is applied. (A) is a cross-sectional view (cross-sectional view taken along the line AA in FIG. 1) of the upper rail mounting portion according to the embodiment of the present invention, and (B) is an operation explanatory view. It is a partial expansion perspective view of the stopper part vicinity of the slide door which concerns on embodiment of this invention. FIG. 4 is a sectional view taken along line BB in FIG. 3. It is CC sectional view taken on the line in FIG. A cross-sectional view of a conventional upper rail mounting portion, FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front door opening 2 Sliding door opening 3 Roof panel 4 Side body outer panel 5 Side body inner panel 6 Lower cover 6a Lower wall 6b Vertical wall 6d Flange part 7 Upper cover 7a Upper wall 7b Vertical wall 7d Flange part 8 Upper rail 10 Upper rail mounting part 11 Stopper 11a Stopper plate 100 Car body

Claims (6)

  A side body outer panel and a side body inner panel that form a side panel of the vehicle body form a side opening that is opened and closed by a sliding door, and an upper rail mounting portion to which an upper rail that guides the sliding door is mounted is defined as the side rail. An upper rail mounting portion structure of a sliding door type automobile connected to a body outer panel and a side body inner panel, wherein the upper rail mounting portion is welded to the side body outer panel and the upper rail is fixed. An upper rail mounting portion structure for a sliding door type automobile, wherein the upper cover and the lower cover welded to the side body inner panel are welded.   The upper cover includes a flange portion that is welded to the side body outer panel, and an upper wall that is connected to the flange portion and extends to the inside of the vehicle body and to which the upper rail is fixed to the lower surface. A flange portion welded and joined to the side body inner panel, and a lower wall that is connected to the flange portion and extends toward the inside of the vehicle body, and an inner end portion of the upper wall of the upper cover and a lower wall of the lower cover The upper rail mounting part structure of a sliding door type automobile according to claim 1, wherein the inner end part is welded and joined.   An inner end portion of the upper wall of the upper cover is bent downward to form a vertical wall, and an inner end portion of the lower wall of the lower cover is bent upward to form a vertical wall. The vertical wall on the lower cover side is overlapped and welded so that the vertical wall on the upper cover side is on the outside of the vehicle, and the upper rail mounting portion is formed in a substantially U-shaped cross section that opens to the outside of the vehicle body. The upper rail mounting part structure of the sliding door type automobile according to claim 1 or 2.   The upper cover includes a flange portion that is welded to the side body outer panel, an upper wall that is connected to the flange portion and has the upper rail fixed to the lower surface, and extends downward from an inner end of the upper wall. And a vertical wall welded to the lower cover, and a stopper member abutting against a locking member provided on the slide door is fixed to the upper wall and the vertical wall of the upper cover. The upper rail mounting part structure of the sliding door type motor vehicle according to claim 1.   A side body outer panel and a side body inner panel that form a side panel of the vehicle body form a side opening that is opened and closed by a sliding door, and an upper rail mounting portion to which an upper rail that guides the sliding door is mounted is defined as the side rail. A method for assembling an upper rail mounting portion of a sliding door type automobile connected to a body outer panel and a side body inner panel, wherein an upper cover constituting an upper portion of the upper rail mounting portion and a lower cover constituting a lower portion are provided. Produced separately, before joining the side body outer panel and the side body inner panel, the upper rail is fixed to the lower surface of the upper cover, and then the upper cover is welded to the side body outer panel. Slided characterized by Assembling process of the upper rail attachment portion of the expression vehicle.   Prior to joining the side body outer panel and the side body inner panel, the lower cover is welded to the side body inner panel, and then the inner end of the lower cover is welded to the inner end of the upper cover. The method for assembling the upper rail mounting portion of the sliding door type automobile according to claim 5.

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