JP2890979B2 - Coupling structure of body frame members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for connecting frame members of a vehicle body.

[0002]

2. Description of the Related Art Conventionally, as a vehicle body frame structure, for example, FIGS. 16 and 17 described in Japanese Patent Application Laid-Open No. Sho.
There is something like that shown in FIG. 17 is a partially cut-away enlarged view of XVII in FIG.

[0003] That is, in the portion of FIG.
1a, 121b and 121c are connected by a connecting portion 123. The connecting portion 123 has connecting pieces 125, 127, and 129 having different angles as shown in FIG. 17, for example.
The connecting portions of 1a, 121b, and 121c are inserted and joined from three sides.

[0004]

However, in the above-described conventional body frame structure, the pipe member 121 is not provided.
a, 121b and 121c are connected to the respective connecting pieces 12 of the connecting portion 123.
5, 127, and 129, the pipe members 121a, 121b, and 121c are sequentially inserted into the connecting pieces 125 when the vehicle body is assembled.
Accumulation errors may accumulate and make it impossible to insert the last tube member 121c. When inserting the tube member 121c, there is a possibility that the already assembled structure must be twisted.

[0005] For this reason, there has been a risk that the assembling accuracy is reduced and distortion due to torsion is caused.

In addition, since the connecting piece 125 is required as a separate member, the number of parts is considerably increased in the entire vehicle body.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a connecting structure of a vehicle body frame member which can improve assembling accuracy, has a small number of parts, and can be easily assembled.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is a first vehicle body skeleton member having a hollow closed-section structure, and a hollow closed-section structure connected to the first body skeleton member. A second vehicle body skeleton member, a rib is provided inside the first vehicle body skeleton member, at least two closed cross sections are formed inside the first vehicle body skeleton member, and the first vehicle body skeleton member is provided. An opening communicating with any of at least two closed cross sections is provided on an outer surface of the member, and a cross section formed by the rib and an inner surface of any of the at least two closed cross sections between ends of the first body frame member. Forming a substantially U-shaped fitting receiving portion, forming a fitting insertion portion at an end of the second vehicle body frame member, inserting the fitting inserting portion into the fitting receiving portion from the opening, The end of the second body frame member is connected to the rib of the first body frame member and the plurality of closed members. Wherein the coupling surrounding at the surface.

According to a second aspect of the present invention, there is provided the vehicle body frame member coupling structure according to the first aspect, wherein the first vehicle body frame member has a front pillar, a side roof rail, and a rear pillar having the same closed cross-sectional structure. The upper side rail formed, wherein the second body frame member is at least one of a front roof rail, a rear roof rail forming a frame of a vehicle body roof, and a center pillar forming a frame of a vehicle body side portion. Features.

According to a third aspect of the present invention, in the connecting structure of the vehicle body frame member according to the second aspect, when the second vehicle body frame member is at least one of a front roof rail and a rear roof rail, the roof rail is connected to the window. A shape having at least two hollow closed cross-sections, a portion having a shield panel mounting flange and another portion, wherein the fitting insertion portion is provided at an end of the closed cross-section having the windshield panel mounting flange. A coupling structure for a vehicle body skeleton member, characterized in that:

[0011] The invention of claim 4 is the invention of claim 2 or claim 3.
Wherein the second vehicle body frame member is at least one of a front roof rail and a rear roof rail, and the opening and the fitting receiving portion are directed in the vehicle front-rear direction. The insertion of the fitting insertion portion into the fitting receiving portion is performed from the front-rear direction of the vehicle body.

According to a fifth aspect of the present invention, in the connecting structure of the vehicle body skeleton member according to the second aspect, when the second vehicle body skeleton member is a center pillar, the opening is directed to the side of the vehicle body. The insertion of the fitting insertion portion into the fitting receiving portion is performed from the side of the vehicle body.

[0013]

According to the first aspect of the present invention, it is possible to insert and fit the fitting insertion portion of the second body frame member to the fitting receiving portion of the first body frame member.

According to the second aspect of the present invention, the front roof rail, the rear roof rail, or the center pillar is connected to the upper side rail in which the front pillar, the side roof rail, and the rear pillar are integrated. can do.

According to the third aspect of the present invention, the fitting insertion portion provided at the end of the closed section having the windshield panel of the front roof rail or the rear roof rail is inserted and fitted into the fitting receiving portion of the upper side rail. Can be combined.

According to the fourth aspect of the present invention, the fitting insertion portion of the front roof rail or the rear roof rail can be inserted into the fitting receiving portion from the opening of the upper side rail in the front-rear direction of the vehicle body.

According to the fifth aspect of the present invention, the fitting insertion portion of the center pillar can be inserted from the opening of the upper side rail into the fitting receiving portion from the side of the vehicle body.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 7 show an embodiment of the present invention. FIG. 1 shows a connecting portion between an upper side rail 19 as a first body frame member and a front roof rail 27 as a second body frame member. FIG. 2 is a perspective view of the upper side rail 19 as viewed from the inside of the vehicle body, FIG. 3 is a plan view of a joint between the upper side rail 19 and the front roof rail 27, and FIG. 4 is a view taken along the line IV-IV in FIG. 5 is a sectional view taken along line VV of FIG. 3, FIG. 6 is a sectional view showing another embodiment of the engaging portion in the same section as FIG. 4, and FIG. 7 is a vehicle body frame member according to the present invention. 1 is an overall perspective view of a vehicle body to which the coupling structure of FIG.

The vehicle body frame according to the embodiment of the present invention
It is composed of a light alloy extruded material such as an aluminum alloy formed by extrusion or the like.

First, the entire body frame will be described.
As shown in FIG. 7, a front frame of the vehicle body is constituted by the front upper frame 1, the front side frame 3, the front hinge pillar 5, the suspension mounting member 7, and the like.

A side sill 9 is connected to a lower end of the hinge pillar 5, and the side sill 9 and the like constitute a lower frame of the vehicle body.

A center pillar 11 is erected substantially in the middle of the side sill 9, and a rear frame of the vehicle body is constituted by a rear upper frame 13, a rear side frame 15, a rear hinge pillar 17 and the like at a rear end thereof.

The upper side rail 19 is connected to upper ends of the front hinge pillar 5 and the rear hinge pillar 17. This upper side rail 1
9 is formed in a closed cross-section structure having the same cross-section by extrusion or the like, and a front pillar 21, an upper side rail 19 and a rear pillar 25 are integrally formed by bending.

At the front and rear upper ends of the upper side rail 19, a front roof rail 27 and a rear roof rail 2 are provided.
9 are combined with each other to form a roof rail on which the roof 31 is mounted.

The upper side rail 19 is shown in FIG.
As shown in FIGS. 2 and 4, two hollow closed cross-sections (hereinafter, referred to as an upper closed cross-section and a lower closed cross-section) 33 and 35 are formed adjacent to each other while sharing a rib 37. The upper closed section 33 includes an upper wall portion 39 and left and right wall portions 41 and 4.
3 and a rib 37, and the lower closed cross section 35 is formed by the rib 37, left and right walls 45 and 47, and a lower wall 49.

As shown in FIG. 2, the upper side rail 19 is fitted to the side of the upper closed cross section 33, that is, the inner wall 41 in the vehicle width direction, at the portion where the front roof rail 27 is joined. Insertion section 51
Is formed in the opening 53. The opening 53
The fitting receiving portion 55 for fitting the fitting insertion portion 51 at the end of the front roof rail 27 is opened by the upper wall portion 39, the rib 37, and the right wall portion 43. In this embodiment, the opening 53 and the fitting receiving portion 55 are oriented in the front-rear direction of the vehicle body. The upper side rail 19 includes a drip channel 57.

On the other hand, the front roof rail 27 is
As shown in FIG. 5, two hollow closed cross-sections (hereinafter, referred to as front closed cross-section and rear closed cross-section) 59 and 61 are formed adjacent to each other via a connection wall 63. The front closed cross section 59 is formed by upper and lower wall portions 65 and 67, a front wall portion 69, and a connecting wall portion 63, and a windshield 71 (see FIG. 4) to which a windshield panel, which is a windshield panel, is attached to the front wall portion 69. A panel mounting flange 73 is provided.

The end of the front closed section 59 is extended longer than the rear closed section 61, and the upper side rail 19
The fitting insertion part 51 is formed by bending into a shape along the shape. As shown in FIG. 4, the fitting insertion portion 51 has upper and lower wall portions 65 and 67 each having an upper side rail 19.
The engagement receiving portion 55 is configured to engage with the upper wall portion 39 and the rib 37.

As shown in FIG. 6, the connecting wall 63 may be formed so as to engage with the right wall 43.

The upper side rail 19 and the front roof rail 27 formed as described above are connected by inserting the fitting insertion portion 51 of the front roof rail 27 into the opening 53 of the upper side rail 19 from the front of the vehicle body. The upper and lower wall portions 65 and 67 of the fitting 51 are connected to the upper wall portion 3 of the fitting receiving portion 55.
9 and the rib 37, respectively, and the upper wall portion 39 of the fitting receiving portion 55 and the upper wall portion 65 of the fitting insertion portion 51 at the opening 53, and the rib 37 and the fitting inserting portion 51 of the fitting receiving portion 55. The lower wall 67 is bonded by an adhesive or welded by arc welding as shown in FIGS. 3 and 4, respectively.

The roof 31 is joined so as to cover the upper side rail 19 including the joint, and the glass 71 is attached to the windshield panel attachment flange 73 of the front roof rail 27 with an adhesive or the like.

Therefore, the connection between the upper side rail 19 and the front roof rail 27 can be performed without difficulty. Further, the front roof rail 27 can be connected to the upper side rail 19 by moving the front roof rail 27 in parallel from the front of the vehicle body, and automation by a robot or the like is easy. Also, since no special connecting member is used, the number of parts is small, and assembly and parts management are easy.

Next, the load operation of the above embodiment will be described.

FIG. 14 is a side view showing a state in which a load is applied to the vehicle body to which the roof rail coupling structure according to the present invention is applied.

That is, the load applied to the upper part of the vehicle body includes a crushing load when the vehicle rolls over, a bending load of the entire vehicle body due to the occupant's riding, and a torsional load of the entire vehicle body due to reverse vertical input to the left and right suspensions when the vehicle turns. And so on. When such a load is applied, a moment is also applied to a connecting portion between the upper side rail 19 and each member such as the front roof rail 27, the center pillar 11, the rear roof rail 29, and the like, and a force from the upper side rail 19 to each of the above members is exerted. Is transmitted as shown in the table of FIG.

That is, when a roof crushing load when the vehicle rolls over and a bending load on the entire vehicle body are applied to the upper part of the vehicle body, a force for bending and deformation is input to the upper side rail 19, and the bending deformation force is applied to the upper side rail 19. Rail 19
When the torsional load transmitted from the upper wall portion 39 to the front roof rail 27 and input during the turning of the vehicle is applied to the upper side rail 19, a force which is torsionally deformed is input to the upper side rail 19. The force is transmitted to the front roof rail 27 from the ribs 37 of the upper side rail 19, the upper wall 39, and the upper end of the right wall 43.

As described above, the upper side rails 19 and the front roof rails 27 are integrated at the joint portion to absorb energy while suppressing local deformation.

Accordingly, the energy absorption characteristics can be improved, and the rigidity of the vehicle body as a whole can be improved.

FIGS. 8 to 11 show another embodiment of the present invention.

This embodiment shows an example of a connection structure of an upper side rail 19 as a first body frame member and a center pillar 11 as a second body frame member. FIG. FIG. 9 is an exploded perspective view of a connecting portion of the center pillar 11, FIG. 9 is a sectional view taken along line IX-IX of FIG. 8, FIG. 10 is a sectional view taken along line XX of FIG. 8, and FIG. FIG. 1 to 7
The same components as those described above are denoted by the same reference numerals, and redundant description will be omitted.

As shown in FIGS. 8 and 11, a fitting insertion portion 75 of the center pillar 11 can be inserted into the right wall portion 47 and the lower wall portion 49 of the lower closed section 35 of the upper side rail 19. An opening 77 is formed. The opening 77 forms a fitting receiving portion 79 in which the fitting insertion portion 75 of the center pillar 11 is fitted by the rib 37, the left wall portion 45, and the lower wall portion 49. The opening 77 and the fitting receiving portion 79 are directed to the side of the vehicle body.

As shown in FIG. 8, the center pillar 11 is formed in a front-rear symmetric shape by two frames 81 having the same closed cross section 80 as shown in FIG. The fitting insertion portion 75 of the center pillar 11 is formed by bending the upper end portion of the center pillar 11 in the vehicle front-rear direction along the upper side rail 19, and the fitting insertion portion 75 is formed as shown in FIG. The upper side rail 19 includes a rib 37, a left wall 45, and a lower wall 49, which engage with the left wall 45 and the lower wall 49, a left wall (an inner wall in the vehicle width direction) 85, and a lower wall 87, respectively. .

At the lower end of the center pillar 11, a fitting insertion portion 89 to be connected to the side sill 9 is formed. The fitting insertion portion 89 is formed by bending the lower end of the center pillar 11 in the vehicle longitudinal direction along the side sill 9.

On the other hand, the side sill 9 has an opening 91 into which the fitting insertion portion 89 of the center pillar 11 is inserted. The opening 91 forms a fitting receiving portion 101 in which the fitting insertion portion 89 is fitted by the upper vertical wall portion 95 of the side sill outer wall portion 93 and the vertical wall portion 99 of the side sill inner wall portion 97. The right wall portion (outer wall portion in the vehicle width direction) 103 of the fitting insertion portion 89 engages with the upper vertical wall portion 95 of the side sill outer wall portion 93, and the fitting insertion portion engages with the vertical wall portion 99 of the side sill inner wall portion 97. The left wall portion (vehicle width direction inner wall portion) 105 of 89 is engaged.

The upper side rail 19 and the center pillar 11 formed as described above are connected by inserting the fitting insertion portion 75 of the center pillar 11 into the opening 77 of the upper side rail 19, and The wall portion 83, the left wall portion 85, and the lower wall portion 87 are engaged with the rib 37, the left wall portion 45, and the lower wall portion 49 of the fitting receiving portion 79, respectively. The upper wall portion 83 and the rib 37 of the fitting receiving portion 79 are connected to the lower wall portion 87 of the fitting insertion portion 75 by the fitting receiving portion 7.
The lower wall portions 9 are bonded by an adhesive, welding by arc welding, or the like.

The center pillar 11 and the side sill 9
Is inserted by inserting the fitting insertion portion 89 of the center pillar 11 into the opening 91 of the side sill 9 and connecting the left and right walls 105 and 103 of the fitting insertion portion 89 to the vertical wall 99 of the fitting receiving portion 101 and the upper vertical wall. The left wall 105 of the fitting insertion portion 89 and the vertical wall 99 of the fitting receiving portion 101 are respectively engaged with the fitting insertion portion 8.
The right wall 103 and the upper vertical wall 95 of the fitting receiving portion 101 are respectively bonded by an adhesive or by arc welding.

With such a structure, the center pillar 11 can be connected to the upper side rail 19 from the side of the vehicle body without using a connecting member.

Next, the load action of the above embodiment will be described.

As shown in the table of FIG. 15, when a force for bending deformation is input to the upper side rail 19 due to the roof crushing load and the bending load of the entire vehicle body, the bending deformation force is applied to the upper side rail 19. Rib 37
Is transmitted to the center pillar 11, and when a force for torsional deformation is input to the upper side rail 19 due to the torsional load of the entire vehicle body, the torsional deformation force is applied to the rib 37 of the upper side rail 19 and the lower wall portion. The power is transmitted to the center pillar 11 from the upper end portion of the left wall portion 45 and the center pillar 11.

As described above, the joint between the center pillar 11 of the upper side rail 19 is integrated to absorb energy while suppressing local deformation.

Accordingly, the energy absorption characteristics can be improved as in the above-described embodiment, and the rigidity of the entire vehicle body can be improved.

FIGS. 12 and 13 show still another embodiment of the present invention.

This embodiment shows an example of a coupling structure of an upper side rail 19 as a first vehicle body frame member and a rear roof rail 29 as a second vehicle body frame member. FIG. FIG. 13 is an exploded perspective view of a joint portion between the rear roof rail 29 and FIG.
FIG. 3 is a sectional view taken along line II-XIII. The same components as those in FIGS. 1 to 7 are denoted by the same reference numerals, and redundant description will be omitted.

The left side wall (the inner wall in the vehicle width direction) 41 of the upper closed cross section 33 of the upper side rail 19 is provided with the structure shown in FIG.
As shown in FIG. 2, the fitting insertion portion 1 of the rear roof rail 29
07 is formed. The opening 109 is formed by the fitting receiving portion 11 into which the fitting insertion portion 107 of the rear roof rail 29 is fitted by the upper wall portion 39 and the rib 37.
1.

On the other hand, the rear roof rail 29 is formed of the same frame material as the above-mentioned front roof rail 27, and its fitting insertion portion 107 has upper and lower wall portions 65 and 67, as shown in FIG. It is configured to engage with the upper wall portion 39 and the rib 37 of the fitting receiving portion 111 of the side rail 19.

The upper side rail 19 and the rear roof rail 29 formed as described above are connected by inserting the fitting insertion portion 107 of the rear roof rail 29 into the opening 109 of the upper side rail 19 and moving the fitting insertion portion 107 up and down. The wall portions 65 and 67 are connected to the upper wall portion 39 of the fitting receiving portion 111 and the rib 37.
And the fitting receiving portion 1 at the cross section of the opening 109.
11 and the upper wall portion 65 of the fitting insertion portion 107,
The rib 37 of the fitting receiving portion 111 and the lower wall portion 67 of the fitting inserting portion 107 are respectively bonded by an adhesive or welding by arc welding.

Next, the load operation of the above embodiment will be described.

As shown in the table of FIG. 15, when a force for bending deformation is input to the upper side rail 19 due to the roof crushing load and the bending load of the entire vehicle body, the bending deformation force is applied to the upper side rail 19. Upper wall 39
Is transmitted to the rear roof rail 29, and when a force for twisting deformation is input to the upper side rail 19 due to the torsional load of the entire vehicle body, the torsional deformation force is applied to the rib 37 of the upper side rail 19, the upper wall portion. 39 and the upper end of the right wall 43 are transmitted to the rear roof rail 29.

As described above, the upper side rail 19 and the rear roof rail 29 are integrated with each other at the joint to absorb energy while suppressing local deformation.

Accordingly, the energy absorption characteristics can be improved as in the above-described embodiment, and the rigidity of the entire vehicle body can be improved.

As shown in the above-described embodiments, the coupling structure according to the present invention includes the front roof rail 27 and the rear roof rail 29 located near the upper wall of the upper side rail 19 and the center pillar 11 located near the lower wall. Since the notch portion and the rib 37 into which at least one engaging portion is fitted are provided on the upper side rail 19, when assembling the last member at the time of assembling the vehicle body, the already assembled structure is assembled without twisting. Can be attached.

Accordingly, assembling work can be easily performed, assembling accuracy as a structure can be improved, and rigidity of the entire vehicle body can be improved.

[0064]

As is clear from the above description, according to the structure of the first aspect of the present invention, the second body frame member is surrounded by the ribs and the closed cross section of the first body frame member. When a crushing load is applied, the load can be distributed to the closed section via the rib, and the load can be reliably dispersed. Further, when a bending load is applied to the entire vehicle body, not only the load is supported by the closed cross section arranged in the vertical direction of the second vehicle body skeleton member via the rib, but also the second vehicle body skeleton member is supported. The load can also be supported by the closed cross-sections disposed before and after, and also in this respect, the support can be reliably performed. Furthermore, even when the torsion load of the whole body is applied,
The load can be efficiently distributed from the U-shaped fitting receiving portion to each closed cross section, and reliable support can be performed. In addition, since the fitting insertion portion of the second body frame member is inserted into the substantially U-shaped fitting receiving portion, even if a slight assembly error occurs, the error is removed from the opposite portion by the vehicle. Since it is extruded into a space such as in the width direction, it is not necessary to perform an unreasonable assembly, and errors do not stay as internal stress.

According to the second aspect of the present invention, at least one of the front roof rail and the rear roof rail can be coupled to the upper side rail.

According to the third aspect of the present invention, there is no problem in connecting the windshield panel.

According to the fourth or fifth aspect of the present invention, by performing the connection from a specific direction, the assemblability is improved, and automation by a robot or the like is facilitated.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a coupling portion between an upper side rail and a front roof rail according to one embodiment.

FIG. 2 is a perspective view of the upper side rail according to the embodiment as viewed from the inside of the vehicle body.

FIG. 3 is a plan view of a coupling portion between an upper side rail and a front roof rail according to one embodiment.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

FIG. 5 is a sectional view taken along line VV of FIG. 3;

FIG. 6 is a sectional view showing another embodiment of the engaging portion in the same section as FIG. 4;

FIG. 7 is an overall perspective view of a vehicle body to which the joint structure of a roof rail according to the present invention is applied.

FIG. 8 is an exploded perspective view of a coupling portion between an upper roof rail and a center pillar according to another embodiment.

9 is a cross-sectional view taken along line IX-IX in FIG.

FIG. 10 is a sectional view taken along line XX of FIG. 8;

11 is a sectional view taken along line XI-XI in FIG. 8;

FIG. 12 is an exploded perspective view of a joint between an upper side rail and a rear roof rail according to another embodiment.

FIG. 13 is a sectional view taken along line XIII-XIII in FIG. 12;

FIG. 14 is a side view showing a state in which a load is applied to a vehicle body to which the roof rail coupling structure according to the present invention is applied.

FIG. 15 is a table showing transmission of force in the joint structure of the roof rail according to the present invention.

FIG. 16 is a side view of a vehicle body skeleton structure according to a conventional example.

FIG. 17 is a partially cutaway enlarged view taken along the line XVII-XVII in FIG. 16;

[Explanation of symbols]

 11 Center pillar (second body frame member) 19 Upper side rail (first body frame member) 27 Front roof rail (second body frame member) 29 Rear roof rail (second body frame member) 37 Rib 51, 75 , 89, 107 Fitting insertion part 53, 77, 91, 109 Opening 55, 79, 101, 111 Fitting receiving part 73 Windshield panel mounting flange

Claims (5)

(57) [Claims] A first vehicle body frame member having a hollow closed section structure, and a second vehicle body frame member having a hollow closed section structure connected to the first vehicle body frame member; A rib is provided therein, and at least two closed sections are formed inside the first body frame member, and an opening communicating with any of the at least two closed sections is provided on an outer surface of the first body frame member. A fitting receiving portion having a substantially U-shaped cross section formed by the rib and an inner surface of any of the at least two closed cross sections is formed at an end of the first vehicle body skeleton member; A fitting insertion portion is formed at an end of the skeletal member, the fitting insertion portion is inserted into the fitting receiving portion from the opening, and a second vehicle body skeleton member end is provided with a rib of the first vehicle body skeleton member. A vehicle body skeletal member that is surrounded and connected by a plurality of closed sections. Connection structure. 2. The coupling structure for a vehicle body skeleton member according to claim 1, wherein the first vehicle body skeleton member has a front pillar, a side roof rail, and a rear pillar integrally formed in the same closed cross-sectional structure. A vehicle body skeleton, wherein the second vehicle body skeleton member is at least one of a front roof rail, a rear roof rail, and a center pillar that forms a skeleton of a vehicle body side, forming a skeleton of the vehicle body roof. Member connection structure. 3. The connecting structure of a vehicle body frame member according to claim 2, wherein the roof rail is attached to a windshield panel mounting flange when the second vehicle body frame member is at least one of a front roof rail and a rear roof rail. A vehicle body having at least two hollow closed cross-sections including a portion having the same and another portion, and the fitting insertion portion is provided at an end of the closed cross-section having the windshield panel mounting flange. Skeletal member connection structure. 4. The joint structure for a vehicle body frame member according to claim 2, wherein the second vehicle body frame member is at least one of a front roof rail and a rear roof rail. A coupling structure for a vehicle body skeleton member, wherein a mating receiving portion is oriented in a vehicle front-rear direction, and insertion of a fitting insertion portion into the fitting receiving portion is performed from a vehicle front-rear direction. 5. The vehicle body frame member coupling structure according to claim 2, wherein the second vehicle body frame member is a center pillar.
A coupling structure of a vehicle body frame member, wherein the opening is directed toward the vehicle body, and the insertion of the fitting insertion portion into the fitting receiving portion is performed from the vehicle body side.