JP2013241148A - Body structure of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the deformation of a sidewall in which, when the sidewall of a vehicle body is deformed due to an impact by a side collision, the deformation of one part is made smaller than that of the other part intentionally selected out of front and rear parts of the sidewall with a cross member of the body used as a reference.SOLUTION: A body structure of a vehicle includes: a floor panel 7 mounted to lower end sides of right and left sidewalls 6 of a body 2; a tunnel 21 formed on an intermediate part of the floor panel 7 in a width direction of the body 2; lower rails 38 extended in the longitudinal direction of the body 2 mounted to the lower end sides of the sidewalls 6 and guiding doors 34 to open and close door openings 15 of the sidewalls 6; and cross members 63 disposed near the lower rails 38 and mounted to the lower end sides of the sidewalls 6 and tunnel 21. A fragile part 81 is formed at a part where the lower rail 38 exits longer with the cross member 63 as a reference out of the front and rear parts in the intermediate part in the longitudinal direction of the cross member 63.

Description

  The present invention relates to a vehicle body structure of a vehicle in which a lower rail for guiding a sliding door is attached to a lower end portion of a side wall of the vehicle body.

  Conventionally, there is a vehicle body structure of the vehicle described in Patent Document 1 below. According to this publication, the vehicle body structure includes a left and right side wall of the vehicle body, a floor panel extending in a substantially horizontal direction and having the lower ends of both side walls erected on the side, and the floor panel in the width direction of the vehicle body. A tunnel part formed by bulging the middle part upward, a door capable of opening and closing a door opening formed in the side wall, and a lower end part of the side wall attached to the side wall extending in the front-rear direction of the vehicle body A lower rail that guides the door to open and close the door opening, and is disposed in the vicinity of the lower rail in the front-rear direction of the vehicle body, and extends in the width direction of the vehicle body so that the lower end portion of the side wall is installed on the tunnel and the tunnel portion. And a cross member.

  Then, when an external force is applied to the door to move it forward and backward, the door is guided by the lower rail and moves in a predetermined forward and backward direction, and the door opening can be opened and closed by this movement. .

  On the other hand, when an object collides with the vehicle from the outside (side collision), the side wall of the vehicle body is usually bent and deformed to some extent toward the inside of the vehicle body by the impact force. And the said impact force is absorbed by this deformation | transformation and a passenger | crew is protected. In this case, since the cross member improves the rigidity of the side wall, the cross member firmly supports the impact force in the longitudinal direction. For this reason, excessive deformation of the side wall due to the impact force is prevented, and the passenger is also protected by this.

JP 2007-8398 A

  By the way, a portion of the side wall of the vehicle body that is in the same position as the cross member in the longitudinal direction of the vehicle body is prevented from being excessively deformed by an impact force at the time of a side collision. However, the front and rear portions of the side wall with respect to the cross member tend to bend and deform toward the inside of the vehicle body due to the impact force.

  Here, the lower rail guides the door and is a member having sufficient strength and rigidity to achieve its function. For this reason, the lower end portion of the side wall to which the lower rail is attached is reinforced by the lower rail to improve the rigidity. As a result, at the time of a side collision, the deformation of the portion (rear portion) on the side where the lower rail exists longer among the front and rear portions of the side wall is the other portion (front portion) on the side where the lower rail exists shorter. ), The deformation of this other part tends to be large.

  However, for reasons such as improving occupant protection, other parts of the front and rear parts of the side wall where the lower rail is shorter than the deformation of the part of the side where the lower rail is longer (rear part). Sometimes I want to make it smaller in the front part). However, this is not easy with the conventional technique.

  Therefore, it is conceivable to provide a separate reinforcing material on the other part of the front and rear parts of the side where the lower rail is shorter. However, if this is done in this way, the rigidity of the side wall becomes excessive as a whole, which may result in insufficient impact force absorption due to deformation at the time of a side collision. There is also a risk that the productivity will be reduced due to an increase in the mass of.

  The present invention has been made paying attention to the above-described circumstances, and an object of the present invention is to define a side wall with respect to the cross member of the vehicle body when the side wall of the vehicle body is deformed by an impact force at the time of a side collision. It is possible to control the deformation of the side wall so that the deformation of the other part is smaller than the intentionally selected one of the front part and the rear part, thereby improving the occupant protection. Is to be able to.

  Another object of the present invention is to achieve the above-described deformation control of the side wall of the vehicle body at the time of a side collision without increasing the rigidity of the side wall or reducing the productivity of the vehicle body. It is to be.

The invention of claim 1 includes the left and right side walls 6 of the vehicle body 2, a floor panel 7 extending in a substantially horizontal direction and having the lower ends of the side walls 6 erected on the side, and the floor panel in the width direction of the vehicle body 2. 7, a tunnel portion 21 formed by bulging the middle portion 7 upward, a door 34 capable of opening and closing the door opening 15 formed in the side wall 6, and the side wall 6 extending in the front-rear direction of the vehicle body 2. A lower rail 38 is attached to a crocodile, and is disposed in the vicinity of the lower rail 38 in the front-rear direction of the vehicle body 2 to guide the door 34 so as to open and close the door opening 15, and extends in the width direction of the vehicle body 2 to In the vehicle body structure of the vehicle including the cross member 63, the lower end portion of the side wall 6 is installed in the tunnel and the tunnel portion 21.
The vehicle is characterized in that a fragile portion 81 is formed in a portion of the front and rear portions of the cross member 63 in the middle in the longitudinal direction on the side where the lower rail 38 exists longer with the cross member 63 as a reference. It is a car body structure.

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

  The effects of the present invention are as follows.

According to the first aspect of the present invention, the left and right side walls of the vehicle body, a floor panel extending in a substantially horizontal direction and having the lower ends of the both side walls erected on the side, and the middle part of the floor panel in the width direction of the vehicle body A tunnel portion formed by expanding the door, a door capable of opening and closing the door opening formed on the side wall, and a lower end portion of the side wall extending in the front-rear direction of the vehicle body is attached to the side wall, and the door opening A lower rail that guides the door to open and close, and a cross member that is disposed in the vicinity of the lower rail in the front-rear direction of the vehicle body, extends in the width direction of the vehicle body, and the lower end portion of the side wall extends between the tunnel and the tunnel portion. In the vehicle body structure with
Of the front and rear portions in the midway portion of the cross member in the longitudinal direction, a fragile portion is formed in a portion on the side where the lower rail is longer than the cross member, and the following effects are produced.

  That is, when the side wall of the vehicle body is about to deform due to the impact force at the time of a side collision of the vehicle, the part on the side where the lower rail exists longer among the front and rear parts of the side wall relative to the cross member is Since the reinforcement by the lower rail is more sufficiently performed, the deformation is smaller than that of the other part, and the deformation of the other part tends to be large.

  However, as described above, a fragile portion is formed in a portion of the front and rear portions of the cross member in the longitudinal direction of the cross member on the side where the lower rail is longer than the cross member.

  For this reason, when an impact force at the time of a side collision of the vehicle is given to the longitudinal direction of the cross member, stress concentration due to compression occurs in the weak part of the cross member, and the cross member is centered on the weak part. Tends to bend in a valley shape. Therefore, as described above, at the time of a side collision, the deformation of the side where the lower rail is longer in the side wall is usually smaller than that of the other part, and the deformation of the other part tends to be large. Contrary to this, according to the bending of the cross member centered on the above-mentioned weak part, the side part where the lower rail exists longer on the side wall is intended to be deformed than that of the other part by interlocking with this. Therefore, it is possible to control the deformation of the side wall by increasing the size and reducing the deformation of the other portions.

  As a result, it is possible to further improve the protection of the occupant by separating the portion of the side wall that is scheduled to be deformed more greatly from the occupant in advance during a side collision.

  In addition, since the deformation control of the side wall of the vehicle body at the time of the above-described side collision can be achieved without separately providing a reinforcing material for the side wall, firstly, the above deformation control is performed on the side wall. This can be achieved without excessive rigidity. Secondly, the above-described deformation control can be achieved while suppressing an increase in the number of parts of the vehicle body and preventing the vehicle body from becoming complicated or having a heavy mass. Thirdly, since the above-described deformation control can be achieved by suppressing an increase in the number of parts of the vehicle body, it can be achieved at low cost without reducing the productivity of the vehicle body.

It is a top view of the right side inside a vehicle body. 1 is an overall side view of a vehicle body. FIG. 2 is a partially enlarged detail view of FIG. 1. FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. 3. FIG. 5 is an enlarged cross-sectional view taken along line VV in FIG. 3. FIG. 4 is an enlarged sectional view taken along line VI-VI in FIG. 3. FIG. 4 is a partially exploded perspective view of what is shown in FIG. 3.

  With respect to the vehicle body structure of the vehicle according to the present invention, when the side wall of the vehicle body is about to be deformed by an impact force at the time of a side collision, one of the front and rear portions of the side wall based on the cross member of the vehicle body is intentionally selected. In order to realize the object of enabling the control of the deformation of the side wall to make that of the other part smaller than the deformation of the part and thereby improving the protection of the occupant. The form for carrying out is as follows.

  That is, the vehicle body structure includes a left and right side wall of the vehicle body, a floor panel extending in a substantially horizontal direction and having the lower ends of both side walls erected on the side, and a middle part of the floor panel in the width direction of the vehicle body. A tunnel portion formed by bulging upward; a door capable of opening and closing a door opening formed on the side wall; and a lower end portion of the side wall extending in the front-rear direction of the vehicle body and attached to a crocodile, A lower rail that guides the door to open and close the opening, a cross member that is disposed in the vicinity of the lower rail in the front-rear direction of the vehicle body, extends in the width direction of the vehicle body, and has a lower end portion of the side wall spanned between the tunnel and the tunnel. Is provided. Among the front and rear portions in the middle portion in the longitudinal direction of the cross member, a fragile portion is formed in a portion on the side where the lower rail is longer than the cross member.

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

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

  The vehicle body 2 of the vehicle 1 is made of sheet metal as a whole, and the interior of the vehicle body 2 is a casing 3. The vehicle body 2 has a left and right side wall 6 that forms the side surface of the vehicle compartment 3 and a lower surface of the vehicle compartment 3 extending in a substantially horizontal direction. A pair of left and right floor panels 7 that are spaced apart from each other in the width direction of the vehicle body 2 and extend in the front-rear direction of the vehicle body 2 to support the floor panel 7 from the lower surface side. A side member 8 and a roof panel 9 that is installed on each upper edge of the left and right side walls 6 to form the upper surface of the vehicle compartment 3 are provided.

  Each side wall 6 has outer and inner panels 11 and 12 that face each other in the width direction of the vehicle body 2 and face each other and are firmly coupled to each other. Rear door openings 14 and 15 are formed in the side wall 6 before the inside and outside of the passenger compartment 3 communicate with each other. A rocker 17 that extends long in the front-rear direction of the vehicle body 2 is formed at the lower end of the side wall 6 by joining the outer and inner panels 11 and 12 together. A center pillar 18 extending in the vertical direction is formed between the front and rear door openings 14 and 15 in the middle of the left and right walls 6 in the front-rear direction of the right wall 6. Each of the rocker 17 and the center pillar 18 has a hollow closed cross-sectional structure in the longitudinal direction thereof, has high strength and rigidity, and serves as a skeleton member of the vehicle body 2.

  Of the left and right walls 6, the left and right walls 6 are integrally formed with the front and rear door openings 14 and 15, and the center pillar 18 is not provided. A pillar 18 may be provided.

  A tunnel portion 21 that bulges upward and has high strength and rigidity is formed in the center portion 20 that is an intermediate portion in the width direction of the vehicle body 2 of the floor panel 7. The tunnel portion 21 extends long in the front-rear direction. . The support member 24 is joined to the upper surface of the floor panel 7 by welding so as to overlap the side member 8 in a plan view of the vehicle body 2 (FIG. 3). The support member 24 is disposed at the same position as the center pillar 18 in the longitudinal direction of the vehicle body 2, and extends long in the longitudinal direction of the vehicle body 2 along the side member 8. The support member 24 is made of sheet metal, and each section in the longitudinal direction has a hat shape.

  A door 31 is provided that closes the front door opening 14 so as to be openable and closable from the outside of the vehicle body 2. Further, a slide door device 32 that closes and opens the rear door opening 15 from the outside of the vehicle body 2 is provided. The slide door device 32 has a slide type rear door 34. The rear door 34 extends in the front-rear direction of the vehicle body 2 along the outer surface of the upper end portion, the middle portion in the vertical direction, and the lower end portion of the rear portion of the side wall 6 so as to open and close the rear door opening 15. The upper, center, and lower rails 36 to 38 that are guided in the front-rear direction are supported. Each of the rails 36 to 38 is fitted with a roller 39 that can move only in the longitudinal direction, and the rear door 34 is supported and connected to each of the rollers 39 by an arm 40. .

  A box-shaped support 43 made of sheet metal is provided that extends in the front-rear direction of the vehicle body 2 and has an opening 42 that opens toward the outside of the vehicle body 2. Each section in the longitudinal direction of the box-shaped support body 43 has a U-shape that opens toward the outside of the vehicle body 2. The box-shaped support body 43 is disposed inside the rocker 17 whose lower end portion at the rear portion of the side wall 6 forms a flange. The box-like support 43 is attached to the rocker 17 by welding using various attachment panels 44, and these attachment panels 44 reinforce the rocker 17 and the box-like support 43, respectively.

  Another opening 45 is formed in the outer panel 11 of the rocker 17 facing the opening 42 of the box-like support 43 in the width direction of the vehicle body 2, and the opening edges of both the openings 42, 45 are coupled to each other. Yes. The rocker 17 and the box-shaped support body 43 have sufficiently large strength and rigidity due to this connection and reinforcement by the mounting panel 44 described above. The lower rail 38 is included in the box-shaped support body 43 and is supported on the upper surface of the box-shaped support body 43 by a fastener or welding (not shown). The rear door 34 is connected to the roller 39 fitted in the lower rail 38 by the arm 40 through the openings 42 and 45.

  The box-shaped support body 43 is formed by joining an upper plate 49 and a lower plate 50 to each other. Further, one end portion (front end portion) 43 a of the box-shaped support body 43 is extended so as to bulge toward the inner side of the vehicle body 2 from the side wall 6. The front end portion of the lower rail 38 is gradually bent toward the inner side of the vehicle body 2 toward the front, and this bent portion is included in one end portion 43a of the box-shaped support body 43. 43a is attached.

  On the other hand, a through hole 46 penetrating in the width direction of the vehicle body 2 is formed in the inner panel 12 above the rocker 17. And the one end part 43a of the said box-shaped support body 43 is arrange | positioned in the lower end part of the compartment 3 through the said through-hole 46. As shown in FIG. The through hole 46 and the one end portion 43 a of the box-shaped support body 43 are disposed at the same position as the center pillar 18 in the front-rear direction of the vehicle body 2. One end portion 43 a of the box-shaped support body 43 is coupled to the support member 24 by a fastener 51.

  A door drive unit 54 for moving the rear door 34 in the front-rear direction is provided. The door drive unit 54 is attached to the upper surface of the one end portion 43a of the box-shaped support body 43 and outputs a driving force so that it can rotate forward and backward, and is attached to the box-shaped support body 43. And a driving force transmitting portion 56 that transmits the driving force output from 55 to the rear door 34 and moves the rear door 34 in the front-rear direction. The driving force transmission unit 56 mainly includes an endless belt 59 and pulleys 60 around which the belt 59 is wound.

  If the electric motor 55 of the door drive unit 54 is driven to rotate forward and backward, the driving force is transmitted to the rear door 34 via the driving force transmitting portion 56, and the rear door 34 moves forward and backward. The rear door opening 15 can be opened and closed.

  A sheet metal cross member 63 is provided which extends in the width direction of the vehicle body 2 and extends between the upper portion of the rocker 17 and the upper portion of the tunnel portion 21 where the lower end portion of the side wall 6 is a trap. The electric motor 55 and the cross member 63 are arranged at the same position as the center pillar 18 in the front-rear direction of the vehicle body 2 and in the vicinity of the lower rail 38. The electric motor 55 is covered by the cross member 63 from above. It has been broken.

  The cross member 63 has a hat-shaped cross section in the longitudinal direction, and faces the front and rear sides of the vehicle body 2 at a distance from each other, the rear plates 64 and 65, and the upper and lower edges of the front and rear plates 64 and 65, respectively. And upper and lower front flanges 67 and 68 formed integrally with the lower end edges of the front and rear plates 64 and 65, respectively.

  The top plate 66 and front and rear outward flanges 67 and 68 at the outer end of the vehicle body 2 in the cross member 63 are fastened to the top surface of the rocker 17 by fasteners 71 and 72, respectively. The top plate 66 and the front and rear outward flanges 67 and 68 at the inner end of the vehicle body 2 in the cross member 63 are attached to a sheet metal bracket 74 welded to the tunnel portion 21 by fasteners 75 and 76, respectively. It is concluded. Further, the front and rear outward flanges 67 and 68 in the midway portion of the cross member 63 in the longitudinal direction are fastened to the upper surface plate of the support member 24 by fasteners 78, respectively.

  The upper surfaces of the rocker 17, the tunnel portion 21, and the cross member 63 are substantially the same height. A midway portion in the longitudinal direction of the cross member 63 is raised by the support member 24, and a lower end surface of the cross member 63 is spaced upward from the floor panel 7.

  Of the front and rear portions in the middle of the longitudinal direction of the cross member 63, a fragile portion 81 is formed in a portion on the side where the lower rail 38 is longer than the cross member 63, that is, in the rear portion. .

  Specifically, in the plan view of the vehicle body 2 (FIGS. 1 and 3), the front folding portion of each portion in the longitudinal direction of the cross member 63 extends linearly in the width direction of the vehicle body 2. In order to reduce the width dimension of the cross member 63 on the outer side of the vehicle body 2 than on the inner side of the cross member 63, the rear fold portion of the cross member 63 is forward in the middle of the cross member 63 in the longitudinal direction. It is bent toward. More specifically, a ridge line formed by the rear surface plate 65 and the upper surface plate 66 of the cross member 63 is bent in the middle in the longitudinal direction. When the impact force F is applied from the object 83 in the longitudinal direction of the cross member 63 at the time of a side collision caused by any object 83, the bending portion described above breaks the rigidity of the cross member 63 that opposes the impact force F. It becomes a point (stress concentration part) and corresponds to the fragile part 81.

  Front and rear seats 85, 86 are provided on the side of the vehicle body 3 so that the occupant 84 can be seated forward, and these seats 85, 86 are supported on the floor panel 7 side. In this case, the front seat 85 is supported on the floor panel 7 side by a pair of left and right seat rails 87. The rear portion of each seat rail 87 is fastened to the cross member 63 by the fasteners 72 and 76 and is supported by the floor panel 7 via the cross member 63. In the front-rear direction of the vehicle body 2, the rear portion of the front seat 85 is located at the same position as the center pillar 18 and the cross member 63, and the rear seat 86 is disposed behind the center pillar 18 and the cross member 63.

  Here, as described above, the box-shaped support body 43 that has the opening 42 that opens toward the outer side of the vehicle body 2 and supports the lower rail 38 therein is the rocker whose lower end portion is the side wall 6. 17 is attached inside.

  For this reason, as shown in FIG. 4, when an impact force F is applied from the object 83 to the side wall 6 in a side collision, the box-like support 43 is greatly deformed so that the opening 42 is opened, and the center The upper part of the pillar 18 tends to be deformed so as to largely fall toward the inside of the vehicle body 2.

  However, as described above, there is provided the cross member 63 that extends in the width direction of the vehicle body 2 and is installed on the upper portion of the rocker 17 and the tunnel portion 21 where the lower end portion of the side wall 6 is a trap.

  For this reason, the impact force F is firmly supported by the cross member 63 in the longitudinal direction. Therefore, the deformation of the box-shaped support 43 so that the opening 42 of the box-shaped support 43 is opened by the impact force F is more reliably prevented by the cross member 63, and the occupant 84 is more protected. Certainly achieved.

  Here, as shown in FIG. 1, when the impact force F is applied to the side wall 6 from the object 83 and the side wall 6 is to be deformed at the time of a side collision of the vehicle 1, the cross member 63 is used as a reference. Of the front and rear portions of the side wall 6, the portion on the side where the lower rail 38 is longer (rear portion) is further reinforced by the lower rail 38, and the deformation thereof is the other portion (front portion). The deformation of this other part tends to be larger. Then, the deformation of the other part (front part) of the side wall 6 occurs in the front-rear direction of the vehicle body 2 in the vicinity of the upper body of the occupant 84 on the front seat 85, and thus the protection of the occupant 84 tends to be insufficient. is there.

  However, as described above, the fragile portion 81 is formed in the front and rear portions of the cross member 63 in the middle in the longitudinal direction on the side where the lower rail 38 is longer than the cross member 63 as a reference. Yes.

  Therefore, particularly in FIG. 1, when an impact force F at the time of a side collision of the vehicle 1 is applied to the longitudinal direction of the cross member 63, stress concentration due to compression occurs in the fragile portion 81 of the cross member 63, With the fragile portion 81 as the center, the cross member 63 tends to be bent in a valley shape as shown by a one-dot chain line in FIG. Therefore, as described above, at the time of a side collision, the deformation of the portion (rear portion) on the side wall 6 where the lower rail 38 exists longer is usually smaller than that of the other portion (front portion). The deformation of the portion (front portion) tends to be large. On the contrary, according to the bending of the cross member 63 with the fragile portion 81 as the center, the lower rail 38 is formed on the side wall 6 by interlocking with the bending. It is possible to control the deformation of the side wall 6 by intentionally increasing the deformation of the part (rear part) on the side where is longer than the other part (front part) and reducing the deformation of the other part. It becomes.

  And the deformation | transformation of the other part (front part) in the said side wall 6 arises in the front-back direction of the vehicle body 2 in the upper body vicinity of the passenger | crew 84 of the front seat 85, but since the deformation | transformation of the said other part is suppressed small, The protection of the passenger 84 can be improved. On the other hand, the deformation of the portion (rear portion) in the side wall 6 is large, but this portion is separated in advance from the upper body of the passenger 84 on the rear seat 86 in the front-rear direction of the vehicle body 2 and is on the leg side. Since it is positioned, the protection of the occupant 84 can be improved.

  Further, since the control of the deformation of the side wall 6 of the vehicle body 2 at the time of the above-described side collision can be achieved without separately providing a reinforcing material to the side wall 6, first, the control of the above-described deformation is made accordingly. Can be achieved without increasing the rigidity of the side wall 6. Second, the above-described deformation control can be achieved while suppressing an increase in the number of parts of the vehicle body 2 and preventing the configuration of the vehicle body 2 from becoming complicated or increasing in mass. Thirdly, the above-described deformation control can be achieved by suppressing an increase in the number of parts of the vehicle body 2 and thus can be achieved at low cost without reducing the productivity of the vehicle body 2.

  As described above, the cross member 63 is supported on the vehicle body 2 side so as to cover the electric motor 55 of the door drive unit 54 from the upper side as a whole.

  For this reason, the use of the cross member 63 can waterproof the electric motor 55 with a simple configuration, and can prevent the electric motor 55 from being damaged when the passenger 84 steps on the electric motor 55.

  As described above, the seat rail 87 for supporting the rear seat 86 is fastened to the vehicle body 2 side by the fasteners 72 and 76 together with the cross member 63.

  Therefore, the support of the rear seat 86 to the vehicle body 2 side is reinforced by the cross member 63. Therefore, since the cross member 63 is used for supporting the rear seat 86, this support is firmly achieved with a simple configuration.

  Further, the cross member 63 is raised upward from the floor panel 7 by the support member 24.

  For this reason, raising the floor carpet (not shown) can be achieved with a simple configuration.

  Further, since the cross member 63 is raised to a predetermined position by the support member 24, the cross member 63 can be made lighter and more compact accordingly. Further, since the lower end portion of the cross member 63 is separated from the floor panel 7 and is not directly reinforced by the floor panel 7, the cross member 63 bends and deforms around the fragile portion 81 at the time of a side collision. This is achieved smoothly and reliably.

  Although the above description is based on the illustrated example, the bracket 74 may not be provided. In this case, the inner end portion of the vehicle body 2 in the cross member 63 may be directly coupled to the tunnel portion 21. Further, the fastening of the cross member 63 by the fasteners 71, 72, 75, 76, 78 to the vehicle body 2 side may be welded instead.

  Further, the fragile portion 81 may be a notch or a longitudinal bead formed in the front and rear portions of the cross member 63, or may be a plate having a reduced thickness.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Car body 3 Car compartment 6 Side wall 7 Floor panel 11 Outer panel 12 Inner panel 15 Door opening 17 Rocker 18 Center pillar 20 Center part 21 Tunnel part 24 Support material 32 Slide door device 34 Door 38 Lower rail 42 Opening 43 Box-like support body 43a One end 45 Opening 46 Through hole 49 Upper plate 50 Lower plate 51 Fastener 54 Door drive unit 55 Electric motor 56 Driving force transmission portion 63 Cross member 64 Front plate 65 Rear plate 66 Top plate 67 Front outward flange 68 Rear outward flange 81 Fragile part 83 Object 84 Crew 85 Front seat 86 Rear seat 87 Seat rail F Impact force

Claims (1)

Formed by bulging upward the middle part of the floor panel in the width direction of the vehicle body, the left and right side walls of the vehicle body, a floor panel extending in a substantially horizontal direction and having the lower ends of both side walls erected A tunnel portion, a door capable of opening and closing a door opening formed in the side wall, and a lower end portion of the side wall extending in the front-rear direction of the vehicle body and attached to a crocodile to open and close the door opening. In a vehicle body structure of a vehicle, comprising: a lower rail for guiding; and a cross member disposed in the vicinity of the lower rail in the front-rear direction of the vehicle body, extending in the width direction of the vehicle body, and having a lower end portion of the side wall erected between a tunnel and a tunnel portion ,
A vehicle body structure for a vehicle, characterized in that a fragile portion is formed in a portion of the front and rear portions of the cross member in the longitudinal direction in the longitudinal direction, on the side where the lower rail is longer than the cross member.

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