JP4844065B2 - Body structure - Google Patents

Description

  The present invention relates to an automobile body structure.

  Some automobiles have a vehicle body structure in which floor side members forming a closed cross section are extended along the front-rear direction of the vehicle on a floor panel constituting a floor surface of a vehicle compartment in order to increase the rigidity of the vehicle body. is there. In this type, there is one in which the floor side member is provided on the vehicle compartment side, that is, on the upper side of the floor panel as viewed from the floor panel (see, for example, Patent Document 1).

  In such a vehicle body structure, since the floor panel constitutes the floor surface of the passenger compartment, if the floor side member protrudes from the floor panel toward the passenger compartment side, a step is generated on the floor surface of the passenger compartment. Therefore, a spacer having the same height as the floor side member is provided at a location where the floor side member on the floor panel is not extended, and the floor surface of the passenger compartment is configured by the upper surface of the spacer and the upper surface of the floor side member. It is considered to prevent a step due to the side member from occurring on the floor surface.

However, providing a spacer to eliminate a step due to a floor side member increases, for example, the number of parts and the number of assembling steps, leading to an increase in the manufacturing cost of an automobile. For this reason, it is considered to extend the floor side member to the lower side of the floor panel (see, for example, Patent Document 2). In this case, since the floor side member does not protrude from the floor panel toward the vehicle compartment side, it is possible to prevent a step due to the floor side member from occurring on the floor surface of the vehicle compartment without using a spacer.
Japanese Utility Model Publication No. 4-42478 (page 1-2, FIG. 1) JP 2002-46653 A (page 2-6, FIG. 1)

  However, in the vehicle body configuration in which the floor side member is extended below the floor panel, it is difficult to extend the member for reinforcing the floor side member to the most effective position. This is because the available space in the space below the floor panel is greatly limited compared to the space above the floor panel from the viewpoint of securing the vehicle height and arranging various pipes. For this reason, in order to obtain a desired reinforcing effect, it may be necessary to reinforce the floor side member by arranging a reinforcing member even at a position where efficiency is reduced, and the reinforcing member is arranged at the most effective position. Compared with doing, it will cause an increase in the weight and size of the reinforcing member.

  Therefore, an object of the present invention is to suppress the occurrence of a step due to the floor side member on the floor surface of the passenger compartment without using a spacer even if the floor side member is extended to the passenger compartment side of the floor panel. Another object of the present invention is to provide a vehicle body structure capable of arranging a member for reinforcing a floor side member at an effective position.

  In order to solve the above-described problems, a vehicle body structure according to the present invention has a groove that protrudes outward of the vehicle compartment and extends along the front-rear direction of the vehicle on the floor panel constituting the floor surface of the vehicle compartment. And a floor side member forming a closed cross section is accommodated inside the groove.

  According to the vehicle body structure of the present invention, the floor side member extending to the vehicle compartment side of the floor panel is housed inside the groove formed in the floor panel, so that the floor panel is moved from the floor panel to the vehicle compartment side. Protruding can be suppressed. For this reason, it can suppress that the level | step difference by a floor side member arises in the floor surface of a compartment, without using a spacer. Moreover, since the floor side member is extended in the compartment side seeing from the floor panel, the reinforcing member can be disposed at an effective position.

  The present invention will be described in detail with reference to the embodiments shown in FIGS.

  FIG. 1 is a partial perspective view schematically showing a vehicle 10 in which the vehicle body structure according to the present invention is adopted, and FIG. 2 is a partial perspective view obtained along the line II in FIG. is there. Each figure includes an arrow L indicating the left side in the width direction of the vehicle 10, an arrow R indicating the right side, an arrow H indicating the height direction of the vehicle 10, and an arrow F indicating the front-rear direction of the vehicle 10. Has been. In the following, description will be made according to the above directions.

  The vehicle 10 includes a floor panel 11 at a lower portion thereof. The floor panel 11 is made of a plate member that has a substantially flat plate shape as a whole, and includes a flat portion 12, a dash lower panel portion 13 (see FIG. 2), and a floor tunnel portion 14. As shown in FIG. 2, the dash lower panel portion 13 is located on the front side of the floor panel 11, curves from the flat portion 12, and rises upward. The floor tunnel portion 14 protrudes upward from the flat portion 12 at the center position in the vehicle width direction and extends along the front-rear direction.

  On the upper side of the floor panel 11, a pair of floor side members 15, 15 are provided. Each of the floor side members 15 and 15 is a long plate member having a substantially U-shaped cross section (see FIG. 6), and extends in the front-rear direction at a line-symmetric position with the floor tunnel portion 14 as the center. It is extended. Each floor side member 15 and 15 forms a closed cross-section in cooperation with the floor panel 11 (see FIG. 6), and increases the rigidity of the vehicle 10, particularly the rigidity of the vehicle 10 with respect to the load in the front-rear direction. . Each floor side member 15, 15 is provided with a floor flange portion 16 for joining to the floor panel 11 (see FIG. 6). The floor flange portion 16 is connected to the floor side member 15, 15. It protrudes outward (vehicle width direction) from both lower ends of the letter-shaped cross section and extends along both lower ends.

  In each of the floor side members 15, 15 of the present embodiment, the U-shaped cross section temporarily changes at the front end portion 17 and the rear end portion 18. As shown in FIG. 3, the front end portion 17 includes a front end flange portion 19 and a front end inclined surface portion 20. The front end flange portion 19 is a plate-like portion that protrudes from the front end of each floor side member 15, 15, and serves as a joint portion of the floor panel 11 to the dash lower panel portion 13. The front end inclined surface portion 20 is an inclined surface that faces upward with a gentler inclination than the curve of the dash lower panel portion 13, and gradually increases the cross-sectional area formed in cooperation with the dash lower panel portion 13 toward the front end flange portion 19. It is reduced to.

The rear end portion 18 includes a rear end flange portion 21 and a rear end inclined surface portion 22. The rear end flange portion 21 protrudes from the rear end of each floor side member 15, 15, and serves as a joint portion to the floor panel 11. The rear end inclined surface portion 22 is an inclined surface that moves downward with a gentle inclination, and gradually reduces the area of the cross section formed in cooperation with the floor panel 11 toward the rear end flange portion 21 .

  A pair of cross members 23, 23 are provided on the upper side of the floor panel 11 (see FIG. 2). Each cross member 23, 23 is a long plate member having a front wall portion 24, a rear wall portion 25, and an upper wall portion 26. The front wall portion 24 rises along the height direction and extends along the vehicle width direction. The rear wall portion 25 extends opposite to the front wall portion 24 at a position behind the front wall portion 24. The upper wall portion 26 spans the upper end of the front wall portion 24 and the upper end of the rear wall portion 25. Thus, each cross member 23, 23 has a substantially U-shaped cross section along the vehicle width direction, and forms a closed cross section in cooperation with the floor panel 11. Each cross member 23, 23 is extended along the vehicle width direction so as to be located on the same straight line at a position symmetrical with respect to the floor tunnel portion 14 (see FIG. 2). Each cross member 23, 23 increases the rigidity of the vehicle 10, particularly the rigidity of the vehicle 10 against a load in the vehicle width direction.

  As shown in FIG. 2, each cross member 23, 23 is provided with a leading edge flange portion 27, a trailing edge flange portion 28, and an inner end flange portion 29. The front edge flange portion 27 is a plate-like portion that extends along the front wall portion 24 below the front wall portion 24 and protrudes forward, and serves as a joint portion to the floor panel 11. The rear edge flange portion 28 is a plate-like portion that extends along the rear wall portion 25 below the rear wall portion 25 and protrudes rearward, and serves as a joint portion to the floor panel 11. The inner end flange portion 29 extends from the front wall portion 24, the rear wall portion 25, and the upper wall portion 26 to the floor tunnel portion 14 at the end portion on the floor tunnel portion 14 side of each cross member 23, 23 extending in the vehicle width direction. It is a plate-like portion that rises along and serves as a junction to the floor tunnel portion 14. Further, although not shown, each cross member 23, 23 is provided with an outer end flange portion, and is connected to side sills 40 (see FIG. 1) provided at both ends of the floor panel 11 located in the vehicle width direction. It becomes a junction.

  Each cross member 23, 23 is provided with a joint recess 30 in its front wall 24. As shown in FIG. 3, the joint recess 30 is formed by notching the front wall portion 24 from the lower end side, and allows the rear end portion 18 of the floor side member 15 to be received. The joint recess 30 is provided with a recess flange portion 31 that serves as a joint to the rear end portion 18.

  Further, a front side member 32 is provided on the floor panel 11. The front side member 32 is attached to the floor panel 11 so as to be positioned on the same straight line as the floor side member 15 from the dash lower panel portion 13 of the floor panel 11 toward the front. Each of the front side members 32 and 32 is a cylindrical member having a closed cross-sectional structure, and has an upper end joined to the dash lower panel portion 13 and a lower end joined to a lower position of the floor panel 11. Each of the front side members 32 and 32 enhances the rigidity of the vehicle 10, particularly the rigidity of the vehicle 10 with respect to the load in the front-rear direction.

  In the vehicle body structure according to the present invention, as shown in FIG. 2, a pair of groove portions 33, 33 are provided in the floor panel 11, and the floor side members 15, 15 are accommodated in the groove portions 33, 33. Since both groove parts 33 and 33 are the same structures except being line-symmetrical centering on the floor tunnel part 14, the groove part 33 on the left side of the vehicle 10 is demonstrated and description of the groove part 33 on the right side is abbreviate | omitted.

  As shown in FIG. 4, the groove portion 33 is a long recess that protrudes downward from the flat portion 12 of the floor panel 11 and extends in the front-rear direction, and extends from the lower portion of the dash lower panel portion 13 to the floor panel 11. It extends toward the rear end. The groove portion 33 includes a bottom surface portion 34 that is parallel to the flat portion 12 of the floor panel 11 and both edge portions 35 that connect the bottom surface portion 34 and the flat portion 12. In the present embodiment, both edge portions 35 are inclined in order to avoid stress concentration due to a sudden shape change.

  The groove portion 33 is formed to have a depth dimension substantially equal to the height dimension of the floor side member 15, and the bottom surface portion 34 has a width dimension that can accept the width dimension of the floor side member 15 including both floor flange portions 16. It is formed (see FIG. 6). The depth dimension of the groove 33 is desirably about 15 mm. The bottom surface portion 34 approaches the dash lower panel portion 13 for a while as it goes forward, and the height dimension of both edge portions 35 is temporarily decreased with this approach. Thus, the depth of the groove 33 gradually increases in the dash lower panel 13 as it goes rearward, and the depth of the flat portion 12 is kept constant.

  As shown in FIG. 5, the floor side member 15 is accommodated in the groove 33. In this accommodated state, the front end flange portion 19 of the front end portion 17 of the floor side member 15 is joined to the dash lower panel portion 13, and the floor flange portion 16 of the floor side member 15 is joined to the bottom portion 34 of the groove portion 33 of the floor panel 11. The Since the depth dimension of the groove part 33 is made equal to the height dimension of the floor side member 15, the upper surface 15a of the floor side member 15 comprises the same plane as the flat part 12 of the floor panel 11 (refer FIG. 6). ).

  As shown in FIG. 2, in the vehicle body structure according to the present invention, the cross members 23, 23 are extended on the floor panel 11 in a state where the floor side members 15, 15 are accommodated in the grooves 33, 33. For this reason, a protrusion 36 is formed on each cross member 23, 23. The protrusions 36 are provided on the front wall 24 and the rear wall 25, and each has a rectangular shape that can be fitted into the groove 33. The above-described joint recess 30 is formed in the projection 36 of the front wall portion 24, and the front edge flange portion 27 of the front wall portion 24 and the rear edge flange portion 28 of the rear wall portion 25 are connected to the front wall portion 24. And it is set as the shape which follows the edge part of each projection part 36 of the rear wall part 25,36.

Each cross member 23, 23 is fitted to each groove portion 33, 33 at the position straddling the rear end portion 18 of each floor side member 15, 15, and the protrusion portion 36 of the front wall portion 24 is fitted. The floor side members 15, 15 are fitted in the joint recesses 30 of the rear wall portion 25, and the rear edge flange portion 28 of the rear wall portion 25 on the rear end flange portion 21 of the rear end portion 18 of each floor side member 15, 15. Are arranged on the floor panel 11 along the vehicle width direction. In this state, the front edge flange portion 27 and the rear edge flange portion 28 are joined to the flat portion 12 of the floor panel 11, and the recess flange portion 31 of the joint recess 30 is connected to each floor side member. 15 and 15, and the inner end flange portion 29 is joined to the floor tunnel portion 14. Further, the rear edge flange portion 28 of each cross member 23, 23 and the rear end flange portion 21 of the rear end portion 18 of each floor side member 15, 15 are punched in the vertical direction and joined to the floor panel 11. (See FIG. 3).

  Thus, in the vehicle body structure according to the present invention, the upper surfaces 15a of the floor side members 15 and 15 constitute the same plane as the flat portion 12 of the floor panel 11, and the cross members 23 and 23 correspond to the floor side members 15, 15 and the floor panel 11 are joined without causing a gap. Therefore, as shown by a two-dot chain line in FIG. 6, when the carpet 37 is laid on the flat portion 12 of the floor panel 11, the upper surface 15 a is flat at the place where each floor side member 15, 15 is extended. Since the carpet 37 is supported on the same plane as the portion 12, the floor surface 39 of the passenger compartment 38 can be made flat without using a spacer.

  In the vehicle body structure of the present invention, the following effects can be obtained.

  (1) Since each floor side member 15, 15 extends above the floor panel 11, that is, toward the vehicle compartment 38 side of the floor panel 11, it is effective even when it is necessary to provide a reinforcing member. It is possible to arrange the reinforcing member at any position. This is effective in the following cases. Since the floor panel 11 is configured such that the dash lower panel portion 13 rises upward, when a load from the front of the vehicle 10 is input to the front side member 32, the floor panel 11 and each floor side member 15 and 15, a force (see arrow A in FIG. 3) in the bending direction toward the passenger compartment 38 is generated, and a compressive stress is generated on the floor 39 side. When the reinforcing member is provided on the side where the compressive stress is generated, the space on the passenger compartment 38 side can be used, and the reinforcing member can be disposed at an effective position.

(2) Since the rear end portion 18 of each floor side member 15, 15 is located inward of the closed cross section formed by each cross member 23 , 23 , the rear wall portion 25 of each cross member 23 , 23 It is no longer necessary to form a joint recess in the cross member 23, and the cross section coefficient of each cross member 23, 23 can be increased. For this reason, compared with the vehicle body structure in which the joint recess is formed in the rear wall portion 25 of each cross member 23 , 23 , the strength in the vehicle width direction is not lowered and the rigidity against the load from the side surface is ensured. Further, it is not necessary to set the thickness of each cross member 23, 23 to be thick or add a reinforcing member, so that an increase in manufacturing cost and weight can be suppressed.

  (3) Since the rear end portion 18 of each floor side member 15, 15 is positioned within the closed cross section of each cross member 23, 23, the rigidity of the rear end portion 18 and the floor panel 11 in the vicinity thereof is set to each cross member. 23, 23 can be supplemented. For this reason, for example, when the load is input from the front, the possibility that the load is concentrated and the floor panel 11 is easily bent is reduced, and the thickness of the floor panel 11 is set to be thick, or a reinforcing member is added. The increase in manufacturing cost and weight can be suppressed.

  (4) At the rear end portion 18 of each floor side member 15, 15, the rear end flange portion 21 joined to the floor panel 11 from the front wall portion 24 of each cross member 23, 23 by the rear end inclined surface portion 22. Since the cross-sectional area is gradually decreased between the two, the floor side members 15 and 15 are less likely to concentrate on the load, and the rigidity of the floor panel 11 can be increased.

  (5) Since the rear end portion 18 of each floor side member 15, 15 extends to a position below the rear wall portion 25 of each cross member 23, 23, the load input from the front is received in a wide range. I can do it.

  (6) The rear end flange portion 21 formed at the rear end portion 18 of each floor side member 15, 15 is joined to the floor panel 11 together with the rear edge flange portion 28 formed at each cross member 23, 23. Therefore, it is possible to improve the bonding strength between the floor side members 15 and 15 and the cross members 23 and 23 without reducing the section modulus of the cross members 23 and 23.

  (7) The rear end flange portion 21 of each floor side member 15, 15 is punched in the vertical direction together with the rear edge flange portion 28 of each cross member 23, 23, and the floor flange of each floor side member 15, 15 The portion 16 and the front edge flange portion 27 and the rear edge flange portion 28 of each cross member 23, 23 are joined to the floor panel 11 in the vertical direction. As described above, since the floor side members 15 and 15 and the cross members 23 and 23 can be joined in the same direction on the floor panel 11, the assembling workability is improved. I can do it.

  (8) Since the grooves 33 and 33 projecting downward from the floor panel 11 extend along the front-rear direction of the vehicle 10, the floor side members 15, without causing a decrease in the aerodynamic performance of the vehicle 10, 15 and the cross-sectional areas of the cross members 23 and 23 can be secured, and the rigidity of the vehicle 10 can be increased.

  (9) As shown in FIG. 2 and FIG. 6, when a pipe 41 is provided inside each groove 33, 33 when viewed in the vehicle width direction, when a load is input to the vehicle 10 from the side, each groove 33, 33 and the floor side members 15 and 15 accommodated in the grooves 33 and 33 can protect the pipe 41. For this reason, it is not necessary to provide a member only for protecting the pipe 41, for example, a pipe cover (not shown), and an increase in manufacturing cost and weight can be prevented.

  Therefore, in the vehicle body structure of the present invention, even if the floor side member 15 is extended to the vehicle compartment 38 side of the floor panel 11, a step due to the floor side member 15 occurs on the floor surface 39 of the vehicle compartment 38 without using a spacer. This can be suppressed, and the member that reinforces the floor side member 15 can be disposed at an effective position.

  The rear end portion 18 of each floor side member 15, 15 is not limited to the configuration of the above-described embodiment. 7 to 9 are partial cross-sectional views similar to FIG. 3 showing examples of different configurations of the rear end portions 18 of the floor side members 15 and 15.

  In FIG. 7, the rear end flange portion 21 ′ provided at the rear end portion 18 of each floor side member 15, 15 is at the intermediate position within the closed cross section of each cross member 23, 23 when viewed in the front-rear direction. 11 is joined. Further, the rear end inclined surface portion 22 'is an inclined surface having a gentler angle than the rear end inclined surface portion 22 of the above-described embodiment. For this reason, the joining flange portion 31 ′ of the joining recess 30 ′ provided in the front wall portion 24 of each cross member 23, 23 is joined to a substantially intermediate position of the rear end inclined surface portion 22 ′. Thereby, since the opening area of the joining recess 30 'can be made smaller than the opening area of the joining recess 30 of the above-described embodiment, the cross section formed by each cross member 23, 23 can be set large. In addition, the cross-sectional modulus of each cross member 23, 23 can be increased, and the rigidity of the vehicle 10 against the load from the vehicle width direction can be increased.

  In addition, as shown in FIG. 7, if each floor side member 15, 15 is set to have a large cross-sectional area, the joining flange portion 31 ′ of the joining recess 30 ′ is joined to the rear end inclined surface portion 22 ′. Even so, without changing the opening area of the joint recess 30 ′, the rear end flange portion 21 ′ of each floor side member 15, 15 is placed inside the closed cross section of each cross member 23, 23, and the floor panel 11. Can be joined.

  Further, as shown in FIG. 8, the rear end flange portion 28 ″ of each floor side member 15, 15 is in contact with the floor panel 11 at a substantially central position within the closed cross section of each cross member 23, 23, and each cross The members 23, 23 are formed so as to extend below the rear edge flange portion 28 ″ of the rear wall portion 25 of the members 23, and are joined to the floor panel 11 in a vertical direction together with the rear edge flange portion 28 ″. It can be set as a structure.

  As shown in FIG. 9, the joining flange portion 31 ″ of the joining recess 30 ″ ″ of each cross member 23, 23 is joined to the intermediate position of the rear end inclined surface portion 22 ″ ″, and the rear end flange portion It is possible to adopt a configuration in which three pieces 28 ″ ″ are punched in the vertical direction together with the rear edge flange portions 28 ″ ″ of the cross members 23 and 23 and joined to the floor panel 11. Even with the configuration shown in FIGS. 8 and 9, the same effect as the configuration of FIG. 7 can be obtained.

  In the above-described embodiment, the depth dimension of each groove part 33, 33 and the thickness dimension of each floor side member 15, 15 (the dimension in the height direction of the vehicle 10) are set to be equal. 33 and 33 should just be what can accommodate each floor side member 15 and 15, and are not limited to an above-described Example.

1 is a partial perspective view schematically showing a vehicle body structure according to the present invention. It is the fragmentary perspective view obtained along the II line | wire of FIG. It is sectional drawing obtained along the II-II line | wire of FIG. It is a perspective view similar to FIG. 2 which shows the groove part of a floor panel. It is a perspective view similar to FIG. 2 which shows the floor panel in which the floor side member was accommodated in the groove part. It is sectional drawing obtained along the III-III line | wire shown by FIG. FIG. 4 is a partially enlarged cross-sectional view of a rear end portion of a floor side member showing an example different from FIG. 3. FIG. 8 is a cross-sectional view similar to FIG. 7 showing an example different from FIG. 7. It is sectional drawing similar to FIG. 7 which shows an example different from FIG. 7 and FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle 11 Floor panel 15 Floor side member 18 Rear end part 21 Rear end flange part 22 Rear end inclined surface part 23 Cross member 24 Front wall part 25 Rear wall part 28 Rear edge flange part 33 Groove part 38 Car compartment 39 Floor surface 41 Piping

Claims (6)

A vehicle body structure in which a long floor side member that forms a closed cross section inward of the passenger compartment of a floor panel that constitutes a floor surface of the passenger compartment extends along the front-rear direction of the vehicle,
The floor panel is provided with a flat portion that forms the floor surface, and a groove portion that protrudes outward from the flat portion and extends along the front-rear direction of the vehicle.
The floor side member has a U-shaped cross section perpendicular to the longitudinal direction,
The floor side member is provided with a floor flange portion extending along the longitudinal direction while projecting outward in the width direction of the vehicle from both lower ends of the U-shaped cross section,
The groove portion is provided with a bottom surface portion having a width dimension capable of receiving the width dimension of the floor side member including the both floor flange portions,
The floor side member has a height dimension set to be equal to a depth dimension of the groove portion, and the flat portion on the upper surface in a state where the both floor flange portions are joined to the bottom surface portion and accommodated inside the groove portion. A vehicle body structure comprising the same plane and defining the flat floor surface.   2. The vehicle body structure according to claim 1, wherein a pipe is provided on the floor panel outside the vehicle compartment and inside the groove when viewed from a center position of the vehicle.   On the floor panel, a front wall portion extending along the vehicle width direction and a rear wall portion extending along the front wall portion on the rear side of the vehicle with respect to the front wall portion are closed. A cross member constituting a cross section is extended, and a rear end portion of the floor side member is positioned within a closed cross section of the cross member between the front wall portion and the rear wall portion. The vehicle body structure according to claim 1 or 2. Inclined surfaces the rear portion of the floor side member, which connects a rear end flange portion is brought into contact with the floor panel at the inside of the groove, the front wall of the rear end flange portion component and the cross member The vehicle body structure according to claim 3, further comprising a portion.   A rear edge flange portion is provided on the rear wall portion of the cross member, and the rear end portion of the floor side member extends to a position below the rear wall portion, and the rear end of the rear end portion The vehicle body structure according to claim 4, wherein the flange portion is joined to the floor panel together with the rear edge flange portion.   The said inclined surface part of the said floor side member is extended to the front rather than the said front wall part of the said cross member seeing in the front-back direction of the said vehicle, The Claim 4 or Claim 5 characterized by the above-mentioned. Car body structure.

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