JP2018012425A - Lower vehicle body structure of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make noise of the outside of a vehicle cabin less likely to reach a floor panel and enhance quietness in the vehicle cabin.SOLUTION: A floor under panel 7 is provided below a floor panel 2. A tunnel insulator 6 serving as a heat shielding member is provided at the inner side of a floor tunnel 10. The inner side of the floor under panel 7 and the outer side of the tunnel insulator 6 are overlapped with each other when viewed in a vehicle width direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a lower body structure of a vehicle, and particularly relates to a technical field of a structure in which a floor under cover is provided below a floor panel and a heat shield member is provided inward of a floor tunnel.

  Conventionally, as disclosed in Patent Document 1, for example, a floor under cover may be provided below the floor panel in order to improve the aerodynamic characteristics of the lower part of the automobile. The floor undercover is provided between the floor tunnel and the side sill on the driver's seat side, and between the floor tunnel and the side sill on the passenger seat side. Part is covered by a floor undercover.

  Further, for example, Patent Document 2 discloses an under cover that covers a lower portion of an engine room. The under cover has a hollow double wall structure having an upper wall and a lower wall.

  Further, as disclosed in Patent Document 3, for example, a heat shield member called a tunnel insulator is disposed inside the floor tunnel in order to suppress the heat of the exhaust pipe from being transmitted to the vehicle interior. ing.

Japanese Patent Laid-Open No. 2006-124436 JP 2000-190873 A JP 2013-6503 A

  By the way, in recent years, further silence has become a major technical issue. As a method of quieting the interior of the vehicle, for example, there is a method of increasing the sound insulating material disposed outside the vehicle interior, but there is a problem that the vehicle weight increases as the sound insulating material increases. However, there is a problem in that it is not preferable in terms of fuel consumption and the cost is increased.

  Therefore, paying attention to the fact that the floor under panel of Patent Document 1 is disposed below the floor panel, it is conceivable to use this floor under panel as a sound insulating material. In this case, it is generally considered that the sound insulation performance is improved by adopting a double wall structure for the floor under panel as in Patent Document 2.

  However, even if the floor under panel has a double wall structure, the floor under panel is provided between the floor tunnel and the driver side sill and between the floor tunnel and the passenger side sill. However, since it does not reach the floor tunnel, an opening is formed between the heat shield in the floor tunnel and the floor under panel, and a part of the floor panel is exposed downward from this opening. . In particular, since the floor of an automobile is long in the vehicle front-rear direction, the opening between the floor under panel and the heat shield member in the floor tunnel becomes longer in the vehicle front-rear direction, increasing the total opening area.

  Therefore, noise outside the passenger compartment can easily reach the floor panel from the opening between the floor under panel and the heat shield member in the floor tunnel, which makes it difficult to improve the quietness of the passenger compartment.

  The present invention has been made in view of the above points, and the object of the present invention is to pay attention to the fact that a floor under panel and a heat shielding member are provided at the lower part of the vehicle. By using both of the members, it is difficult for noise outside the passenger compartment to reach the floor panel and to further reduce the noise inside the passenger compartment.

  In order to achieve the above object, the inner side in the vehicle width direction of the floor under panel and the outer side in the vehicle width direction of the heat shield member are overlapped.

  According to a first aspect of the present invention, a floor tunnel that bulges into the vehicle interior and extends in the vehicle front-rear direction is formed at an intermediate portion of the vehicle floor panel in the vehicle width direction. A floor under panel that extends outward from the vehicle and extends in the vehicle front-rear direction and covers the floor panel from below is provided. Inside the floor tunnel, the floor tunnel is shielded from one side to the other side in the vehicle width direction. In the lower vehicle body structure of the vehicle provided with the heat member, the inside of the floor under panel in the vehicle width direction and the outside of the heat shield member in the vehicle width direction are overlapped.

  According to this configuration, since the floor under panel extends from the outside in the vehicle width direction to the inside and also extends in the vehicle front-rear direction, a wide range of the floor panel is covered by the floor under panel. Further, since the heat shield member in the floor tunnel extends from one side to the other side of the floor tunnel in the vehicle width direction, a wide range of the floor tunnel is covered by the heat shield member. Since the inner side in the vehicle width direction of the floor under panel and the outer side in the vehicle width direction of the heat shield member in the floor tunnel are overlapped, an opening is formed between the floor under panel and the heat shield member in the floor tunnel. In addition, even if an opening is formed, the opening area can be made sufficiently small.

  According to a second aspect of the present invention, an under panel side fastening plate portion extends in the vehicle width direction on the inner side in the vehicle width direction of the floor under panel, and the floor tunnel is formed on the outer side in the vehicle width direction of the heat shield member. A heat shield member side fastening plate portion extending outward in the vehicle width direction is provided so as to overlap the under panel side fastening plate portion in the vertical direction, the under panel side fastening plate portion, and the heat shielding member side fastening plate. The part is fastened to the floor panel.

  According to this configuration, the under panel side fastening plate portion and the heat shield member side fastening plate portion are fastened to the floor panel in a state where they overlap each other in the vertical direction. It is possible to reduce the gap between the two in close contact with each other in the vehicle width direction.

  According to a third aspect of the present invention, an under panel side insertion hole through which a fastening member is inserted is formed in the under panel side fastening plate portion, and a heat shielding member through which the fastening member is inserted in the heat shielding member side fastening plate portion. A side insertion hole is formed so as to substantially coincide with the under panel side insertion hole, and the fastening member common to the under panel side insertion hole and the heat shield member side insertion hole is inserted.

  According to this configuration, the under panel side fastening plate portion and the heat shield member side fastening plate portion are fastened together with the floor panel by the common fastening member. As a result, the under panel side fastening plate portion and the heat shield member side fastening plate portion can be further brought into close contact with each other to further reduce the gap therebetween.

  According to a fourth aspect of the present invention, the floor panel includes a tunnel side frame that protrudes downward and extends in the vehicle front-rear direction to the side of the floor tunnel, the under panel side fastening plate portion, and the heat shielding member. A side fastening plate portion is fastened to the tunnel side frame.

  According to this configuration, the floor under panel is fastened to the tunnel side frame that protrudes downward. Therefore, the floor under panel is disposed away from the main body portion of the floor panel, and the floor under panel and the floor panel are separated from each other. A space is formed between the main body portion. And since the vehicle width direction inner side of the floor under panel and the vehicle width direction outer side of the heat shield member in the floor tunnel are overlapped, the above space is almost closed and close to the closed space. A multi-wall structure is configured by the floor panel.

  According to a fifth aspect of the present invention, the heat shield member includes a heat shield body portion located inside the floor tunnel and the heat shield member side fastening plate portion, and the thickness of the heat shield member side fastening plate portion. Is set to be thinner than the thickness of the heat shield body.

  That is, the heat-shielding effect of the heat-shielding member is mainly required for the heat-shielding main body located inside the floor tunnel, and almost no heat-shielding effect is required for the heat-shielding member side fastening plate. By relatively thinning the heat shield member side fastening plate, the amount of downward protrusion is suppressed at the fastening portion with the floor under panel without sacrificing the heat shield effect required for the heat shield member. Is possible.

  According to a sixth aspect of the present invention, the under panel side fastening plate portion is disposed below the heat shielding member side fastening plate portion, and the heat shielding member side fastening plate portion includes the under panel side fastening plate portion and the floor. It is sandwiched between panels.

  That is, the heat shield member side fastening plate portion is thinner than the heat shield main body portion, so it is considered that the heat shield member side fastening plate portion is easily broken. And the heat shielding member side fastening plate portion is prevented from being broken.

  According to the first aspect of the present invention, the floor panel extends from the outside in the vehicle width direction to the inside and extends in the vehicle front-rear direction, and extends from the vehicle width direction inside of the floor tunnel to the other side of the floor tunnel. Since the heat shield member is overlapped with the outside in the vehicle width direction, the wide area of the floor can be covered with the floor under panel and the heat shield member to improve the sound insulation, and the noise outside the passenger compartment can be It is possible to make it difficult to reach the floor panel from between the heat shield member. As a result, the vehicle interior can be further quieted.

  According to the second invention, the under panel side fastening plate portion provided on the inner side in the vehicle width direction of the floor under panel and the under panel side fastening plate portion provided on the outer side in the vehicle width direction of the heat shield member are overlapped in the vertical direction. Together, it can be fastened to the floor panel. As a result, the inner side in the vehicle width direction of the floor under panel and the outer side in the vehicle width direction of the heat shield member can be brought into close contact with each other, so that the gap between the two can be reduced. Thus, the quietness in the passenger compartment can be further improved.

  According to the third invention, the under panel side fastening plate portion and the heat shield member side fastening plate portion can be fastened together with the floor panel. Thereby, the under panel side fastening plate portion and the heat shield member side fastening plate portion can be further brought into close contact with each other to further reduce the gap between the two, thereby further improving the quietness in the vehicle interior.

  According to the fourth invention, the tunnel side frame protruding downward is provided on the lower surface of the floor panel, and the under panel side fastening plate portion and the heat shield member side fastening plate portion are fastened to the tunnel side frame. A multi-wall structure can be configured with the floor panel. Thereby, the sound insulation performance by having provided the floor under panel can be improved further.

  According to the fifth invention, since the thickness of the heat shield member side fastening plate portion is set to be thinner than the thickness of the heat shield main body portion located inward of the floor tunnel, the heat shield effect required for the heat shield member Without sacrificing the above, it is possible to suppress the amount of downward projection at the fastening portion with the floor under panel so as not to affect the minimum ground clearance of the vehicle.

  According to the sixth invention, by holding the relatively thin heat shield member side fastening plate portion between the under panel side fastening plate portion and the floor panel, it is possible to suppress breakage of the heat shield member side fastening plate portion. it can.

It is the perspective view which looked at the lower body structure of the vehicle concerning an embodiment from the upper part. It is a bottom view of the lower body structure of a vehicle. It is the III-III sectional view taken on the line of FIG. It is the perspective view which looked at the tunnel insulator from the upper left. It is a bottom view of a tunnel insulator. It is the perspective view which looked at the floor under panel from the upper left. It is a bottom view of a floor under panel. It is a bottom view of the lower body structure which removed the tunnel insulator and the floor under panel. It is a bottom view of the lower body structure of the state which removed the floor under panel and attached the tunnel insulator.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 is a perspective view of a lower vehicle body structure 1 for a vehicle according to an embodiment of the present invention as viewed from the upper left. The lower body structure 1 of this vehicle is for a passenger car. In FIG. 1, pillars, doors, fender panels, suspension devices, interior and exterior members, etc. are omitted in order to facilitate understanding of the lower body structure 1. ing. In the description of this embodiment, the front side of the vehicle is simply referred to as “front”, the rear side of the vehicle is simply referred to as “rear”, the left side of the vehicle is simply referred to as “left”, and the right side of the vehicle is simply referred to as “right”. To do.

(Overall configuration of car)
An engine room A in which an engine, a transmission, and the like (not shown) are accommodated is provided at the front of the automobile. Front side frames F1 and F2 are provided on the left and right sides of the engine room A. A passenger compartment B is provided behind the engine compartment A, and the engine compartment A and the compartment B are partitioned by a dash panel D. A driver seat (not shown) is provided on the right side of the front side of the passenger compartment B, and a passenger seat (not shown) is provided on the left side. The driver seat and the passenger seat may be interchanged. A rear seat (not shown) is disposed behind the driver seat and the passenger seat in the passenger compartment B. A luggage compartment C is provided on the rear side of the compartment B, that is, on the rear part of the automobile. It should be noted that the present invention can be applied to an automobile having no rear seat, and the present invention can be applied to an automobile having a three-row seat.

(Lower body structure)
The lower body structure 1 includes a floor panel 2, a cargo compartment bottom panel 3, a left side sill 4, a right side sill 5, a tunnel insulator 6 shown in FIGS. 4 and 5, etc., and a left side shown in FIGS. At least a floor under panel 7 and a right floor under panel 8 are provided.

  The floor panel 2 is made of, for example, a steel plate and extends in the front-rear direction and the left-right direction (vehicle width direction). A vehicle compartment B is provided above the floor panel 2. The front part of the floor panel 2 extends obliquely upward so as to be located upward as it goes to the front end of the floor panel 2, and the lower part of the dash panel D is connected to the front part of the floor panel 2.

  The front side of the floor panel 2 is a front panel portion 2a to which a driver seat and a passenger seat are fixed, while the rear side of the floor panel 2 is a rear panel portion 2b to which a rear seat is fixed. Yes. The front panel portion 2a extends to the vicinity of the feet of the occupant seated on the rear seat. The rear panel portion 2b is formed one step higher than the front panel portion 2a, and a fuel tank 9 is disposed below the rear panel portion 2b as shown in FIG. The fuel tank 9 can be a resin molded product, for example. The bottom wall 9 a of the fuel tank 9 is formed with a concave strip 9 b that is recessed upward and extends in the front-rear direction. The front portion of the concave strip portion 9b is located at the center in the left-right direction below the rear panel portion 2b, while the rear portion is offset to the right. That is, the concave strip portion 9b extends while bending in the left-right direction.

  The cargo compartment bottom panel 3 shown in FIG. 1 extends from the rear part of the rear panel part 2b to the rear side. A cargo compartment C is provided above the cargo compartment bottom panel 3.

  A floor tunnel 10 is formed at the center in the left-right direction of the front panel portion 2a so as to swell toward the inside (upper side) of the passenger compartment B and extend in the front-rear direction. The floor tunnel 10 continuously extends from the front part of the front panel part 2a, which is the front part of the floor panel 2, to the rear part of the front panel part 2a, and is entirely open downward. The front portion of the floor tunnel 10 reaches the engine rule A, while the rear portion of the floor tunnel 10 reaches a space below the rear panel portion 2b, that is, a space in which the fuel tank 9 is disposed. Both the rear portion of the floor tunnel 10 and the front portion of the concave portion 9b of the fuel tank 9 are located at the center in the left-right direction of the vehicle body.

  An exhaust pipe H (shown in phantom lines in FIG. 3) extending from the engine room A is disposed inside the floor tunnel 10. The exhaust pipe H extends to the rear side through the inside of the floor tunnel 10, and further extends to the lower side of the cargo compartment bottom panel 3 through the inside of the recess 9 b of the fuel tank 9. When the vehicle is a rear wheel drive vehicle or a four wheel drive vehicle, a propeller shaft is also disposed inside the floor tunnel 10 although not shown. The width (dimension in the left-right direction) of the floor tunnel 10 is set so as to increase as it approaches the lower portion of the floor tunnel 10.

  As shown in FIG. 1, the left side sill 4 extends in the front-rear direction along the left edge of the floor panel 2. The right side sill 5 extends in the front-rear direction along the right edge of the floor panel 2. On the upper surface of the front panel portion 2a of the floor panel 2, a left first cross member 21 and a left second cross on which a rail (not shown) of a passenger seat is fixed between the floor tunnel 10 and the left side sill 4 The member 22 is joined. The left first cross member 21 is disposed in front of the left second cross member 22. The left first cross member 21 and the left second cross member 22 extend in the left-right direction. The left end portions of the left first cross member 21 and the left second cross member 22 are joined to the left side sill 4, and the right end portions of the left first cross member 21 and the left second cross member 22 are connected to the left side wall of the floor tunnel 10. It is joined.

  Between the floor tunnel 10 and the right side sill 5 on the upper surface of the front panel portion 2a of the floor panel 2, a right first cross member 23 and a right second cross member to which a rail (not shown) of a driver's seat is fixed. 24 is joined. The right first cross member 23 and the right second cross member 24 are configured in the same manner as the left first cross member 21 and the left second cross member 22, and the right first cross member 23 and the right second cross member 24 are The right end is joined to the right side sill 5, and the left ends of the right first cross member 23 and the right second cross member 24 are joined to the right wall of the floor tunnel 10.

  As shown in FIG. 8, the floor panel 2 has a left tunnel side frame 26 and a right tunnel side frame 27. The left tunnel side frame 26 is joined to the left side of the floor tunnel 10 on the lower surface of the floor panel 2, that is, to a portion away from the lower portion of the floor tunnel 10 to the left side. Further, the right tunnel side frame 27 is joined to the right side of the floor tunnel 10 on the lower surface of the floor panel 2, that is, to a part away from the lower portion of the floor tunnel 10 to the right side.

  The left tunnel side frame 26 and the right tunnel side frame 27 protrude downward from the lower surface of the floor panel 2 and extend in the front-rear direction along the floor tunnel 10. Lower walls of the left tunnel side frame 26 and the right tunnel side frame 27 extend in the front-rear direction. A plurality of insertion holes 26 a through which the fastening members J (shown in FIG. 3) are inserted are formed in the lower wall of the left tunnel side frame 26. These insertion holes 26 a are formed at intervals in the longitudinal direction of the left tunnel side frame 26. Similarly, a plurality of insertion holes 27a (shown only in FIG. 8) through which the fastening members J are inserted are also formed in the lower wall of the right tunnel side frame 27.

  Examples of the fastening member J include screws, bolts, various fasteners, and the like. The tunnel insulator 6 and the floor under panels 7 and 8 are fastened to the left tunnel side frame 26 and the right tunnel side frame 27 as described later. Any member can be used. The fastening member J may be screwed into the insertion hole 26a of the left tunnel side frame 26, or may be screwed into a nut (not shown) welded to the inside of the left tunnel side frame 26. May be. The right tunnel side frame 27 can also have a similar screwing structure.

  In this embodiment, the left tunnel side frame 26 and the right tunnel side frame 27 are disposed substantially parallel to each other, but the frames 26 and 27 may be disposed so as to be inclined with respect to the front-rear direction. .

  Further, the floor panel 2 has a left lower frame 28 and a right lower frame 29. The left lower frame 28 is joined to a portion between the left tunnel side frame 26 and the left side sill 4 on the lower surface of the floor panel 2. The right lower frame 29 is joined to a portion between the right tunnel side frame 27 and the right side sill 5 on the lower surface of the floor panel 2. The left lower frame 28 and the right lower frame 29 are inclined with respect to the front-rear direction so as to be located on the outer side in the vehicle width direction toward the rear side.

(Configuration of tunnel insulator)
The tunnel insulator 6 shown in FIGS. 4 and 5 is provided inside the floor tunnel 10 as shown in FIGS. 3 and 9, and the left side of the floor tunnel 10 (one side in the vehicle width direction) to the right side (vehicle side). It is formed so as to extend across the other side in the width direction. That is, the tunnel insulator 6 includes a heat shield main body 61 located inside the floor tunnel 10 and a left insulator fastening plate extending from the lower left side (outside in the vehicle width direction) of the heat shield main body 61 toward the left side. Part (heat shield member side fastening plate part) 62 and right insulator fastening plate part (heat shield member side fastening plate part) extending from the lower part of the right side (vehicle width direction outside) of the heat shield body 61 toward the right side 63. As shown in FIG. 3, the heat shield main body 61 includes a plate-like portion 61 a having a heat-shielding property, and a heat-shielding material 61 b having a higher heat-shielding property laminated on the upper surface of the plate-like portion 61 a. The shape bulges upward so as to follow the inner shape of the floor tunnel 10 as a whole. An exhaust pipe H is arranged inside the heat shield main body 61, and the heat of the exhaust pipe H (heat of the catalyst device when a catalyst device is provided) is mainly blocked by the heat shield main body 61 and the vehicle. It is difficult to communicate to the room.

  The left insulator fastening plate portion 62 and the right insulator fastening plate portion 63 are integrated with the plate-like portion 61a of the heat shield main body portion 61, and are made of members constituting the plate-like portion 61a. Therefore, the thickness of the left insulator fastening plate 62 and the right insulator fastening plate 63 is set to be thinner than the thickness of the heat shield main body 61.

  In this embodiment, the tank insulator 60 is integrated with the tunnel insulator 6. The tank insulator 60 is provided so as to be continuous with the rear portion of the tunnel insulator 6. The tank insulator 60 includes a tank heat shield portion 60a positioned inward of the concave strip portion 9b of the fuel tank 9, and a left tank insulator fastening plate portion 60b extending from the lower left portion of the tank heat shield portion 60a toward the left side. And a right tank insulator fastening plate portion 60c extending from the lower right portion of the tank heat shield portion 60a toward the right side. The left tank insulator fastening plate 60b and the right tank insulator fastening plate 60c are fastened and fixed to the vehicle body.

  The tank heat shield 60 a has a shape that bulges upward so as to follow the shape of the inner surface of the recess 9 b of the fuel tank 9. The front part of the tank heat shield part 60a and the rear part of the heat shield body part 61 constitute a continuous tunnel shape. An exhaust pipe H is disposed inside the tank heat shield 60a, and the heat of the exhaust pipe H is mainly blocked by the tank heat shield 60a and is difficult to transfer to the fuel tank 9. The tunnel insulator 6 and the tank insulator 60 are composed of conventionally known aluminum alloys and various heat insulating materials.

  As shown in FIG. 3, the left insulator fastening plate portion 62 of the tunnel insulator 6 extends from the floor tunnel 10 toward the left side (the vehicle width direction outer side) until it reaches a position directly below the left tunnel side frame 26. As shown in FIGS. 4 and 5, in the left insulator fastening plate portion 62, a plurality of heat shield member side insertion holes 62 a through which the fastening members J are inserted substantially coincide with the insertion holes 26 a of the left tunnel side frame 26. Is formed.

  The right insulator fastening plate portion 63 of the tunnel insulator 6 extends from the floor tunnel 10 toward the right side (the vehicle width direction outer side) until it reaches a position directly below the right tunnel side frame 27. In the right insulator fastening plate portion 63, a plurality of heat shield member side insertion holes 63a through which the fastening members J are inserted are formed so as to substantially coincide with the insertion holes 27a (shown in FIG. 8) of the right tunnel side frame 27. .

(Configuration of floor under panel)
The left floor under panel 7 and the right floor under panel 8 shown in FIGS. 6 and 7 are respectively provided on the left side and the right side below the floor panel 2 and can be made of a resin material such as polypropylene, for example. . The left floor under panel 7 and the right floor under panel 8 are mainly for improving the aerodynamic characteristics of the lower part of the automobile by covering the floor panel 2 from below, but in this embodiment, the floor under panel 7, 8 is also used to improve sound insulation.

  Specifically, the left floor under panel 7 is disposed on the left side of the floor tunnel 10 below the floor panel 2 and extends from the inner side to the outer side of the floor panel 2 to the lower side of the left side sill 4. At the same time, it extends continuously from the front part of the floor panel 2 to the lower part of the cargo compartment bottom panel 3 through the lower part of the fuel tank 9. On the rear side of the left floor under panel 7, an extending plate portion 70 extending to the right side is formed.

  The right floor under panel 8 is disposed on the right side of the floor tunnel 10 below the floor panel 2 and extends from the inner side to the outer side of the floor panel 2 in the vehicle width direction to the lower side of the right side sill 5. It extends continuously from the front part of the panel 2 to the lower part of the cargo compartment bottom panel 3 through the lower part of the fuel tank 9. Then, a space S is formed between the floor panel 2 and the left floor under panel 7 as shown in FIG. 3, and the same is shown between the floor panel 2 and the right floor under panel 8 although not shown. A space is formed.

  As shown in FIG. 3, an under panel side fastening plate portion 71 is provided on the right side that is the vehicle width direction inner side of the left floor under panel 7 so as to extend in the left and right direction. The under panel side fastening plate portion 71 is disposed below the left insulator fastening plate portion 62, and the under panel side fastening plate portion 71 and the left insulator fastening plate portion 62 are overlapped in the vertical direction. A plurality of under panel side insertion holes 71 a through which the fastening member J is inserted are formed in the under panel side fastening plate portion 71 so as to substantially coincide with the insertion holes 26 a of the left tunnel side frame 26.

  A side sill fastening plate 72 is provided on the left side of the left floor under panel 7 in the vehicle width direction. The side sill fastening plate portion 72 extends until reaching the lower side of the left side sill 4. The side sill fastening plate portion 72 is formed with a plurality of insertion holes 72a through which the fastening members J are inserted. By screwing the fastening members J inserted through the insertion holes 72a into the left side sill 4, the left floor under panel is formed. The left side of 7 is fastened and fixed to the left side sill 4.

  The right floor under panel 8 is disposed on the right side of the floor tunnel 10 below the floor panel 2 and extends from the inner side to the outer side of the floor panel 2 in the vehicle width direction to the lower side of the right side sill 5. It extends continuously from the front part of the panel 2 to the lower part of the cargo compartment bottom panel 3 through the lower part of the fuel tank 9. A notch 80 is formed on the rear side of the right floor under panel 8.

  The right floor under panel 8 is disposed on the right side of the floor tunnel 10 below the floor panel 2 and extends from the inner side to the outer side of the floor panel 2 in the vehicle width direction to the lower side of the right side sill 5. It extends continuously from the front part of the panel 2 to the lower part of the cargo compartment bottom panel 3 through the lower part of the fuel tank 9. Therefore, most of the floor panel 2 is covered with the left floor under panel 7 and the right floor under panel 8.

  As shown in FIGS. 6 and 7, an under panel side fastening plate portion 81 is provided on the left side that is the inner side in the vehicle width direction of the right floor under panel 8. The under panel side fastening plate portion 81 is disposed below the right insulator fastening plate portion 63 so that the under panel side fastening plate portion 81 and the right insulator fastening plate portion 63 are overlapped in the vertical direction. A plurality of under panel side insertion holes 81 a through which the fastening member J is inserted are formed in the under panel side fastening plate portion 81 so as to substantially coincide with the insertion holes 27 a of the right tunnel side frame 27.

  A side sill fastening plate portion 82 is provided on the right side of the right floor under panel 8 on the outer side in the vehicle width direction. The side sill fastening plate portion 82 extends until reaching the lower side of the right side sill 5. The side sill fastening plate portion 82 is formed with a plurality of insertion holes 82a through which the fastening members J are inserted. The right side floor under panel is formed by screwing the fastening members J inserted through the insertion holes 82a into the right side sill 5. The right side of 8 is fastened and fixed to the right side sill 5.

(Tunnel insulator and floor under panel installation procedure)
Next, a procedure for attaching the tunnel insulator 6 and the floor under panels 7 and 8 to the floor panel 2 will be described. The tunnel insulator 6 and the tank insulator 60 are attached simultaneously.

  First, as shown in FIG. 9, the tunnel insulator 6 and the tank insulator 60 are arranged at a predetermined mounting position below the floor panel 2. Thereby, the left insulator fastening plate portion 62 of the tunnel insulator 6 is disposed on the lower surface of the left tunnel side frame 26, and the right insulator fastening plate portion 63 is disposed on the lower surface of the right tunnel side frame 27. Then, the left floor under panel 7 and the right floor under panel 8 are arranged at predetermined mounting positions below the floor panel 2. Thereby, the under panel side fastening plate portion 71 of the left floor under panel 7 is disposed on the lower surface of the left insulator fastening plate portion 62. Further, the under panel side fastening plate portion 81 of the right floor under panel 8 is disposed on the lower surface of the right insulator fastening plate portion 63.

  Then, a common fastening member J is inserted into the under panel side insertion hole 71a of the left floor under panel 7 and the heat shield member side insertion hole 62a of the left insulator fastening plate 62, and this fastening member J is inserted into the left tunnel side frame 26. It is inserted into the insertion hole 26 a and screwed into the left tunnel side frame 26. Thus, the under panel side fastening plate portion 71 and the left insulator fastening plate portion 62 are fastened to the floor panel 2 in a state where they overlap each other in the vertical direction. In this fastened state, the left insulator fastening plate 62 is sandwiched between the under panel fastening plate 71 and the left tunnel side frame 26 in the thickness direction.

  Further, a common fastening member J is inserted into the under panel side insertion hole 81 a of the right floor under panel 8 and the heat shield member side insertion hole 63 a of the right insulator fastening plate portion 63, and this fastening member J is inserted into the right tunnel side frame 27. It is inserted into the insertion hole 27 a and screwed into the right tunnel side frame 27. As a result, the under panel side fastening plate portion 81 and the right insulator fastening plate portion 63 are fastened to the floor panel 2 in a state where they overlap each other in the vertical direction. In this fastened state, the right insulator fastening plate 63 is sandwiched between the under panel fastening plate 81 and the right tunnel side frame 27 in the thickness direction.

(Effect of embodiment)
As described above, according to this embodiment, the floor panel 2 in a state where the under-panel-side fastening plate portion 71 of the left-side floor under panel 7 and the left-side insulator fastening plate portion 62 of the tunnel insulator 6 are overlapped in the vertical direction. Can be fastened. Similarly, the right floor under panel 8 can be fastened together with the tunnel insulator 6. Thereby, the floor panel 2 becomes a multiple wall structure.

  In addition, the wide range of the floor panel 2 can be covered with the floor under panels 7 and 8 and the tunnel insulator 6 to improve sound insulation. In addition, since the fastening portions of the floor under panels 7 and 8 and the tunnel insulator 6 overlap each other in the vertical direction, they are fastened together by the fastening member J so that the floor under panels 7 and 8 and the tunnel insulator 6 are brought into close contact with each other. It is difficult to form an opening between the floor under panels 7 and 8 and the tunnel insulator 6, and even if an opening is formed, the opening area can be made sufficiently small. Therefore, it is possible to make it difficult for noise outside the passenger compartment to reach the lower surface of the floor panel 2 from between the floor under panels 7 and 8 and the tunnel insulator 6. Therefore, further silence in the passenger compartment can be achieved.

  Moreover, since the thickness of the left insulator fastening plate portion 62 and the right insulator fastening plate portion 63 of the tunnel insulator 6 is set to be thinner than the thickness of the heat shield body portion 61, the heat shielding effect required for the tunnel insulator 6 is sacrificed. Without doing so, it is possible to suppress the downward projecting amount at the fastening portion with the floor under panels 7 and 8 so as not to affect the minimum ground clearance of the vehicle. In this case, the left insulator fastening plate portion 62 and the right insulator fastening plate portion 63 of the tunnel insulator 6 can be sandwiched between the floor under panels 7 and 8 and the floor panel 2 in the thickness direction. Breakage of 62 and the right insulator fastening plate 63 can be suppressed.

(Other embodiments)
In the above embodiment, the floor under panels 7 and 8 and the tunnel insulator 6 are fastened to the tunnel side frames 26 and 27 constituting a part of the floor panel 2, but the present invention is not limited to this. You may make it fasten to 2 main-body parts.

  Further, the left insulator fastening plate portion 62 and the right insulator fastening plate portion 63 of the tunnel insulator 6 may be disposed and fastened under the under panel side fastening plate portions 71 and 81 of the floor under panels 7 and 8. .

  The above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the lower vehicle body structure of the vehicle according to the present invention can be applied, for example, when a floor under cover is provided below the floor panel of an automobile.

1 Vehicle Lower Body Structure 2 Floor Panel 6 Tunnel Insulator (Heat Insulation Member)
7, 8 Floor under panel 10 Floor tunnel 26, 27 Tunnel side frame 61 Heat shield body 62, 63 Insulator fastening plate (heat shielding member side fastening plate)
62a, 63a Heat shield member side insertion holes 71, 81 Under panel side fastening plate portion J Fastening member

Claims (6)

A floor tunnel that bulges into the vehicle interior and extends in the vehicle longitudinal direction is formed in the vehicle width direction intermediate portion of the vehicle floor panel,
Below the floor panel, a floor under panel that extends from the vehicle width direction inside to the outside of the floor panel and extends in the vehicle front-rear direction and covers the floor panel from below is provided.
In the lower body structure of the vehicle in which a heat shield member is provided on the inner side of the floor tunnel from one side to the other side in the vehicle width direction of the floor tunnel,
A vehicle lower body structure characterized in that an inner side in the vehicle width direction of the floor under panel and an outer side in the vehicle width direction of the heat shield member are overlapped. The lower body structure of the vehicle according to claim 1,
On the inner side in the vehicle width direction of the floor under panel, an under panel side fastening plate portion is provided so as to extend in the vehicle width direction,
On the outside in the vehicle width direction of the heat shield member, a heat shield member side fastening plate portion extending from the floor tunnel to the vehicle width direction outside is provided so as to overlap the under panel side fastening plate portion in the vertical direction,
A lower vehicle body structure for a vehicle, wherein the under panel side fastening plate portion and the heat shield member side fastening plate portion are fastened to the floor panel. In the lower body structure of the vehicle according to claim 2,
The under panel side fastening plate portion is formed with an under panel side insertion hole through which a fastening member is inserted,
The heat shield member side fastening plate portion is formed so that a heat shield member side insertion hole through which the fastening member is inserted substantially coincides with the under panel side insertion hole,
A lower vehicle body structure for a vehicle, wherein the common fastening member is inserted into the under panel side insertion hole and the heat shield member side insertion hole. The lower body structure of a vehicle according to claim 2 or 3,
The floor panel has a tunnel side frame that protrudes downward and extends in the vehicle front-rear direction to the side of the floor tunnel.
A lower body structure of a vehicle, wherein the under panel side fastening plate portion and the heat shield member side fastening plate portion are fastened to the tunnel side frame. In the lower body structure of a vehicle according to any one of claims 2 to 4,
The heat shield member has a heat shield body portion located inside the floor tunnel and the heat shield member side fastening plate portion, and the thickness of the heat shield member side fastening plate portion is the heat shield body portion. The lower body structure of a vehicle, characterized in that it is set thinner than the thickness of the vehicle. In the lower vehicle body structure of the vehicle according to claim 5,
The under panel side fastening plate portion is disposed below the heat shield member side fastening plate portion,
The vehicle lower body structure according to claim 1, wherein the heat shield member side fastening plate portion is sandwiched between the under panel side fastening plate portion and the floor panel.

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