JP2009286157A - Vehicle body lower part structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body structure capable of ensuring a baggage space and an occupant space. <P>SOLUTION: The vehicle body lower part structure is provided with: a pair of right and left side frames 10, 10 extending in a longitudinal direction of the vehicle body; sub-frames 12, 12 connected to the side frames 10, 10 and supporting suspensions 13, 13; an under-cover 20 provided below the sub-frames 12, 12 and forming at least a part of a lower surface of the vehicle body; and reinforcement members 22, 22 provided on an upper surface of the under-cover 20 and extending in the longitudinal direction of the vehicle body. The reinforcement members 22, 22 are supported on the side frames 10, 10 in the state that the under-cover 20 is supported on the lower surface of the reinforcement members 22, 22. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle body lower structure including a pair of left and right side frames extending in the longitudinal direction of a vehicle body and a subframe that supports a suspension.

  2. Description of the Related Art Conventionally, various improvements have been made to the underbody structure of an automobile for the purpose of improving aerodynamic characteristics below the car body.

For example, Patent Document 1 discloses a structure in which a lower part of an engine room at the front of a vehicle body is covered with an under cover having a hollow upper and lower double structure and a lower wall formed on a substantially flat surface. In this structure, since the lower wall of the under cover is flat, the flow below the vehicle body is rectified, and the down force generated at the front part of the vehicle body can be increased. In addition, since the under cover has a double structure, surface rigidity that can resist an increase in downforce is ensured, and traveling stability can be improved while suppressing vibration of the under cover and the like.
JP 2000-190873 A

  Regarding the lower body structure of automobiles, in addition to the improvement of aerodynamic characteristics as described above, there is also a need to improve the rigidity of the vehicle body for the purpose of further improving running stability and protecting passengers in the event of a collision, etc. Yes. However, the conventional structure simply increases the rigidity of the undercover.

  In view of such circumstances, the present invention provides a vehicle body lower structure that can increase the rigidity of the vehicle body itself in addition to the rigidity of the under cover with a simple configuration.

  In order to solve the above problems, the present invention is provided with a pair of left and right side frames extending in the front-rear direction of a vehicle body, a subframe connected to the side frames to support a suspension, and provided below the subframe. An under cover that forms at least a part of the lower surface of the vehicle body, and a reinforcing member that is provided on the upper surface of the under cover and extends in the front-rear direction of the vehicle body, wherein the under cover is a lower surface of the reinforcing member. A vehicle body lower structure is provided that is supported by the side frame in a state of being supported by the vehicle.

  According to this structure, since the reinforcing member is provided on the upper surface of the under cover, the rigidity of the under cover can be increased while maintaining the rectifying effect below the vehicle body by the under cover. In addition, the reinforcing member is supported by the side frame, and the side frame and thus the rigidity of the vehicle body itself can be increased. In particular, the reinforcing member extends in the front-rear direction, so that an occupant and the like can be more reliably protected against a collision in the front-rear direction of the vehicle.

  Furthermore, this structure has a simple configuration in which the reinforcing member provided on the upper surface of the under cover is supported by the side frame, and it is only necessary to attach the under cover and the reinforcing member to the vehicle body. Therefore, it is possible to easily cope with a vehicle having the same platform without changing the design of the vehicle body or the under cover, and the cost can be reduced.

  Moreover, in this invention, it is preferable to provide the support member which supports the said reinforcement member to the said side frame, and the said support member has a shape extended from the said reinforcement member to the said side frame located above the said reinforcement member ( Claim 2).

  If it does in this way, the said reinforcement member can be easily supported with respect to the side frame provided upwards.

  The specific position of the vehicle body lower structure is not particularly limited. For example, there is a case where the under cover is disposed at a position covering the lower part of the engine provided at the vehicle body front (claim). Item 3).

  In this case, the engine can be protected by the under cover.

  Further, the under cover is disposed at a position covering the lower side of the fuel tank and the silencer provided at the rear portion of the vehicle body, and the rear end portion of the under cover is supported by a bumper face provided at the rear portion of the vehicle body. (Claim 4).

  In this case, the fuel tank and the silencer can be protected by the under cover. In this case, the under cover can be more stably supported by the bumper face.

  Also, in the present invention, a pair of side sills that are respectively disposed on the left and right side portions of the vehicle body and extend in the longitudinal direction of the vehicle body, and formed so as to protrude upward in the vicinity of the center in the left-right direction of the floor panel constituting the lower surface of the passenger compartment. A floor tunnel extending in the longitudinal direction of the vehicle body, a floor tunnel member provided in the floor tunnel and extending in the longitudinal direction of the vehicle body, and a sub provided below the floor panel and forming at least a part of the lower surface of the vehicle body An under cover and a sub-reinforcing member provided on an upper surface of the sub-under cover, wherein the sub-reinforcing member includes the side sill and the floor tunnel in a state where the sub-under cover is supported by the lower surface of the sub-reinforcing member. It is preferably supported by at least one of the members (claim 5).

  If it does in this way, while the flow under a floor panel can be rectified by a sub under cover, a floor panel can be protected by a sub under cover, and the membrane vibration of this floor panel can be controlled. Moreover, in this structure, the sub-reinforcing member is supported by the side sill or the floor tunnel member that constitutes the vehicle body, and the rigidity of the vehicle body in the vicinity of the passenger compartment can be increased.

  Here, the sub-reinforcing member includes a left-right reinforcing member having a shape extending in the left-right direction of the vehicle body, and one end in the left-right direction of the left-right reinforcing member is supported by the side sill, and the other end is the floor tunnel. It is preferable that the member is supported by the member (claim 6).

  If it does in this way, while the deformation | transformation in a vehicle interior at the time of a side collision etc. can be suppressed effectively by the said left-right direction reinforcement member, the intensity | strength of the torsional rigidity of a vehicle body can be raised.

  In the present invention, it is preferable that the sub-reinforcing member includes a longitudinal reinforcing member having a shape extending in the longitudinal direction of the vehicle body.

  In this way, the rigidity in the longitudinal direction of the vehicle body can be further increased, and deformation of the passenger compartment during a longitudinal collision can be effectively suppressed.

  As described above, according to the present invention, the rigidity of the under cover and the vehicle body itself can be increased while rectifying the flow below the vehicle body with a simple configuration.

  A preferred embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic bottom view of a vehicle 1 having a lower body structure according to the present invention, and FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG.

  As shown in FIG. 2, the vehicle 1 is a vehicle in which an engine room 2 in which an engine 3 is housed is provided at the front thereof. A row of seats (front seat 6a and rear seat 6b) is provided. The floor panel 5 is kicked up below the rear seat 6b. The floor panel 5 is formed with a kick-up portion 5b behind the upright wall 5a protruding upward. A fuel tank 7 and a silencer 8 are provided below the kick-up portion 5b.

  As shown in FIG. 1, front side frames 10, 10, floor frames 18, 18, and rear side frames 110, 110 are provided in the lower part of the vehicle 1 as a frame constituting a part of the vehicle body. ing. Each of these frames 10, 18, and 110 has a shape extending in the front-rear direction, and is provided symmetrically. The front side frames 10 and 10 are mainly provided on the lower surface of the engine room 2. The floor frames 18, 18 are connected to the rear ends of the front side frames 10, 10, and extend to the standing wall 5a. The rear side frames 110, 110 are provided on the lower surface of the kick-up portion 5b.

  Further, at the lower part of the vehicle 1, below the respective frames 10, 18, 110, there are a front under cover (under cover) 20, a rear under cover (under cover) 120, a first sub under cover (sub under cover). 220 and a second sub-under cover (sub-under cover) 320 are provided. These covers 20, 120, 220, and 320 extend substantially in the horizontal direction and cover the lower surfaces of predetermined portions of the vehicle body. On the upper surface of each cover 20, 120, 220, 320, there are a front reinforcing member (reinforcing member) 22, a rear reinforcing member (reinforcing member) 122, a first sub reinforcing member (sub reinforcing member, left and right direction reinforcing member) 222, Two sub-reinforcing members (sub-reinforcing members, left-right direction reinforcing members) 322 are fixed.

  Specifically, the front under cover 20 is provided at a position covering the lower side of the engine room 2, and a pair of left and right front reinforcing members 22 are fixed to the upper surface of the front under cover 20. Further, the rear under cover 120 is provided at a position covering the lower side of the kick-up portion 5b, and a pair of left and right rear reinforcing members 122, 122 are fixed to the upper surface of the rear under cover 120. In addition, the first sub-under cover 220 and the second sub-under cover 320 are arranged in the vehicle width direction at a position covering the lower part of the floor panel 5 in front of the kick-up portion 5b. The pair of front and rear first sub reinforcing members 222 and 222 are fixed to the upper surface of the first sub under cover 220, and the pair of front and rear second sub reinforcing members 322 and 322 are fixed to the upper surface of the second sub under cover 320, respectively. Yes.

  The front under cover 20, the rear under cover 120, the first sub under cover 220, and the second sub under cover 320 are substantially flat and are made of, for example, synthetic resin. In the vehicle 1, the lower surface of the vehicle body is covered with the substantially flat cover 20, 120, 220, 320 extending in the horizontal direction, and the downward force generated in the vehicle body is increased by rectifying the flow below the vehicle body. be able to. An example of the front under cover 20 is shown in FIG.

  The front reinforcing member 22, the rear reinforcing member 122, the first sub reinforcing member 222, and the second sub reinforcing member 322 have the same structure as each other. For example, as shown in FIG. And a metal member extending in a predetermined direction. In the vehicle 1, the reinforcing members 22, 122, 222, 322 are fixed along the upper surfaces of the covers 20, 120, 220, 320, thereby increasing the rigidity of the covers 20, 120, 220, 320. The deformation of the covers 20, 120, 220, and 320 is suppressed. Here, the reinforcing members 22, 122, 222, and 322 are fixed to the upper surfaces of the covers 20, 120, 220, and 320 by bolts 90 as shown in FIG.

  Next, the detailed structure of each part to which the cover 20, 120, 220, 320 and the reinforcing members 22, 122, 222, 322 are respectively attached will be described.

  A bottom view of the vicinity of the engine room 2 to which the front under cover 20 is attached is shown in FIG. FIG. 5 shows a state in which the front under cover 20 and the front reinforcing member 22 are removed with respect to FIG. As shown in these drawings, the engine room 2 is provided with a pair of left and right front side frames (side frames) 10, 10 that constitute part of the vehicle body, a front suspension, and a sub frame 12 as described above. It has been.

  The front side frames 10 and 10 extend in the vehicle front-rear direction in parallel with each other at positions on the left and right outer sides of the engine 3, and as shown in FIG. 2, extend horizontally toward the rear and then curve downward. It has a shape to The front side frames 10 and 10 are connected to the floor frames 18 and 18 at the respective lower ends.

  The sub-frame 12 supports front suspensions attached to the left and right front wheels 4a and 4a, respectively. In this embodiment, as shown in FIG. 4 and the like, a perimeter frame-shaped subframe 12 in which a frame is arranged along the outer periphery of the lower surface of the engine room 2 is used. Thus, the arms 13 of the left and right front suspensions are supported respectively. The front end of the sub-frame 12 is connected to the front end of the front side frame 10 and the rear end of the sub frame 12 is connected to the floor panel 5. , 10 so as to extend in the front-rear direction substantially in parallel with.

  The front under cover 20 and the front reinforcing member 22 are provided further below the subframe 12.

  The front under cover 20 is a substantially square plate-like member and extends so as to entirely cover the lower side of the engine 3. Specifically, the front under cover 20 extends from the rear end of the front bumper 9 provided at the front end of the vehicle 1 to the rear end of the sub frame 12 and extends between the front side frames 10 and 10. It is configured such that stones or the like scattered from the road surface can be prevented from colliding with the engine 3 and damage to the engine 3 can be suppressed. The front under cover 20 is fixed to the front bumper 9 with bolts 92 at the front end thereof. The front under cover 20 is fixed to the lower surfaces of the front reinforcing members 22 and 22 as described above, and is supported by the front side frames 10 and 10 through the front reinforcing members 22 and 22 as will be described later. Has been.

  The pair of left and right front reinforcing members 22, 22 has a shape extending horizontally from the rear end of the front bumper 9 to the rear end of the front side frames 10, 10, and is formed on the front side frames 10, 10 in a plan view. They are arranged along each of them. The front reinforcing members 22 and 22 are fixed to the front bumper 9 with bolts 92 at the front ends thereof, and the front brackets 24 and 24 and the second brackets (support members) 25 and 25 It is being fixed to the side frames 10 and 10, respectively.

  As described above, the front side frames 10, 10 are curved downward toward the rear end, while the front reinforcing members 22, 22 extend horizontally along the upper surface of the front under cover 20. 10, 10 and the front reinforcing members 22, 22 are spaced apart in the vertical direction on the front side, and are close to each other on the rear side. The first brackets 24 and 24 are provided in portions where the front side frames 10 and 10 and the front reinforcing members 22 and 22 are separated from each other in the vertical direction, and the second bracket 25 is a portion where they are close to each other. Is provided.

  An enlarged view of the vicinity of the first bracket 24 is shown in FIG. 6A, and a sectional view taken along line VI-VI in FIG. 6A is shown in FIG. As shown in these drawings, the first bracket 24 includes a main body portion 24a and flange portions 24b and 24c provided at both upper and lower end portions of the main body portion 24a. The shape extends to the side frame 10. The main body 24a is a columnar member extending in the vertical direction and has a relatively high rigidity. In the first bracket 24, the flange portion 24b provided at the upper end is fixed to the lower surface of the front side frame 10 by a bolt 94 or the like, and the flange portion 24c provided at the lower end is fixed by the bolt 94 or the like to the front reinforcing member. By fixing to the upper surface of 22, the front side frame 10 and the front reinforcing member 22 are connected.

  An enlarged view of the vicinity of the second bracket 25 is shown in FIG. 7A, and a sectional view taken along line VII-VII in FIG. 7A is shown in FIG. 7B. As shown in these drawings, the second bracket 25 includes a plate-shaped fixing plate 25a and a surrounding portion 25b protruding forward from the fixing plate 25a. The surrounding portion 25b has a hollow square pipe shape, and the rear end of the front reinforcing member 22 can be inserted inside the surrounding portion 25b.

  The second bracket 25 is attached to the front side frame 10 with bolts 94 or the like so that the fixing plate 25a extends along the side surface of the front side frame 10 and the surrounding portion 25b protrudes forward. The second bracket 25 is configured such that the rear end of the front reinforcing member 22 is inserted into the surrounding portion 25b and fixed to the surrounding portion 25b with a bolt 25c or the like, so that the front reinforcing member 22 and the front side frame are fixed. 10 is connected.

  Thus, the front reinforcing members 22 and 22 and the front side frames 10 and 10 are connected to each other by the first bracket 24 and the second bracket 25, respectively. The front under cover 20 fixed to 22, 22 is fixed to the front side frames 10, 10.

  As described above, the front side frame 10, the sub frame 12, and the front reinforcing member 22, which are relatively rigid members in order from above, are provided substantially in parallel at the front of the vehicle body of the vehicle 1. The rigidity of the front portion of the vehicle body is enhanced by these members. In particular, the front reinforcing member 22 and the front under cover 20 are connected to the front side frame 10, that is, the vehicle body by the brackets 24 and 25, and the rigidity of the vehicle body itself is enhanced by this connection structure. Further, in the present vehicle 1, the front reinforcing member 22 has a shape extending in the front-rear direction. In addition to the front side frame 10 and the sub frame 12 extending in the front-rear direction, the front reinforcing member 22 is used at the time of a front collision. Since deformation of the vehicle body is effectively suppressed, it is possible to protect the occupant more reliably.

  Here, as shown in FIG. 3, the front reinforcing member 22 has a plurality of bolt holes 22a and 22b for inserting bolts 94 for connecting the first bracket 24 and the second bracket 25, respectively. Is formed.

  A bottom view of the vicinity of the kick-up portion 5b to which the rear under cover 120 is attached is shown in FIG. As shown in the figure, a pair of left and right rear side frames (side frames) 110 and 110 that constitute a part of the vehicle body and a rear suspension are provided below the kick-up portion 5b.

  The rear side frames 110 and 110 have a shape extending horizontally in a parallel state to each other after being bent rearward, rightward and leftward and upward. The fuel tank 7 and the silencer 8 are provided between the rear side frames 110 and 110 in a plan view.

  In the present embodiment, a torsion beam type suspension is used as the rear suspension, and the torsion beam 112 extending in the left-right direction functions as a subframe that supports the arms 113 and 113 of the rear suspension. The torsion beam 112 is fixed below the rear side frames 110 and 110 by connecting the left and right ends of the torsion beam 112 to the bottom surfaces of the rear side frames 110 and 110.

  The rear under cover 120 and the rear reinforcing member 122 are provided further below the torsion beam 112.

  The rear under cover 120 is a substantially square plate-like member and extends so as to entirely cover the lower part of the kick-up portion 5b. Specifically, the rear under cover 120 extends from the standing wall 5a, which is the front end of the kick-up portion 5b, to a rear bumper face (bumper face) 109 provided at the rear end of the vehicle 1, and the rear side frame 110, 110 extends between 110 and covers the lower part of the fuel tank 7 and the silencer 8, and is configured to prevent the fuel tank 7 and the silencer 8 from being damaged by collision of stones and the like scattered from the road surface. The rear under cover 120 is fixed to the rear rear bumper face 109 via a fixing plate 80 at the rear end thereof. The rear under cover 120 is fixed to the lower surface of the rear reinforcing members 122 and 122 as described above, and the floor panel 5 and the rear side frames 110 and 110 are interposed via the rear reinforcing members 122 and 122 as described later. It is supported by.

  The pair of left and right rear reinforcing members 122, 122 has a shape extending horizontally from the rear ends of the floor frames 18, 18 to the rear ends of the rear side frames 110, 110, and the rear side frames 110, 110 in a plan view. Are arranged so as to be substantially along. The front ends of the rear reinforcing members 122 and 122 are fixed to the floor frame 18 by third brackets 124 and 124, and the rear side frames 110 and 110 are rearwardly supported by fourth brackets (support members) 125 and 125. Each is fixed.

  An enlarged view of the vicinity of the third bracket 124 is shown in FIG. 9A, and a cross-sectional view taken along line IX-IX in FIG. 9A is shown in FIG. 9B. As shown in these drawings, the third bracket 124 includes a plate-shaped fixing plate 124a and a surrounding portion 124b protruding in a substantially vertical direction with respect to the fixing plate 124a. The surrounding portion 124b has a hollow square pipe shape, and the front end of the rear reinforcing member 122 can be inserted inside the surrounding portion 124b.

  The third bracket 124 is attached to the rear end of the floor frame 18 with a bolt 94 or the like so that the fixing plate 124a extends along the rear end of the floor frame 18 and the surrounding portion 124b protrudes rearward. The third bracket 124 is configured such that the front end of the rear reinforcing member 122 is inserted into the surrounding portion 124b and fixed in the surrounding portion 124b with bolts 124c or the like, so that the rear reinforcing member 122 and the floor frame 18 are fixed. And By this connection, the rear reinforcing members 122 and 122 and the rear under cover 120 fixed to the rear reinforcing members 122 are supported by the floor frame 18.

  The fourth bracket 125 has the same structure as the first bracket 24 and will not be described in detail. However, the fourth bracket 125 has a shape extending from the rear reinforcing member 122 to the rear side frame 110 as a whole. The lower surface of the rear side frame 110 and the upper surface of the rear reinforcing member 122 are connected. By this connection, the rear reinforcing members 122 and 122 and the rear under cover 120 fixed to the rear reinforcing members 122 are supported by the rear side frame 110.

  As described above, the rear side frame 110, the torsion beam 112, and the rear reinforcing member 122, which are relatively rigid members in order from above, are provided at the rear of the vehicle body of the vehicle 1, respectively. The rigidity of the rear part of the car body is increased. In particular, the fourth bracket 125 connects the rear reinforcing member 122 and the rear under cover 120 to the floor frame 18 and the rear side frame 110, that is, the vehicle body, and this connection structure further increases the rigidity of the vehicle body itself. ing. Further, in the present vehicle 1, the rear reinforcing member 122 has a shape extending in the front-rear direction, and the rear reinforcing member 122 in addition to the rear side frame 110 extending in the front-rear direction also deforms the vehicle body at the time of the rear collision. Is effectively suppressed, so that the passenger can be more reliably protected.

  FIG. 10 is a cross-sectional view taken along the line XX of FIG. 2 and shows a structure of the lower surface of the floor panel 5 to which the first sub under cover 220 and the second sub under cover 320 are attached. As shown in this figure, side sills 14 and 14 extending in the front-rear direction are provided on the left and right sides of the vehicle body. The floor panel 5 has a shape extending between the side sills 14 and 14. A floor tunnel 15 protruding upward is formed at the center in the left-right direction of the floor panel 5. The floor tunnel 15 has a shape extending in the front-rear direction, and a propeller shaft 70 is accommodated inside thereof. Inside the floor tunnel 15, a pair of left and right tunnel members 16, 16 extending in the front-rear direction and a pair of left and right floor tunnel members 17, 17 extending in the front-rear direction are fixed. The tunnel members 16 and 16 are fixed to the upper wall of the floor tunnel 15, and the floor tunnel members 17 and 17 are fixed to the lower end of the floor tunnel 15. The floor tunnel members 17, 17 have a shape protruding downward from the floor panel 5. Further, below the floor panel 5, between the floor tunnel 15 and the side sills 14 and 14, floor frames 18 and 18 constituting a part of the vehicle body are arranged.

  The first sub-under cover 220, the second sub-under cover 320, the first sub-reinforcing member 222, and the second sub-reinforcing member 322 are provided further below the floor frames 18 and 18.

  Each of the first sub-under cover 220 and the second sub-under cover 320 is a substantially rectangular plate member. The first sub-under cover 220 extends to cover the lower part of the right side of the floor panel 5 in front of the kick-up portion 5b, and the second sub-under cover 320 is formed on the floor panel 5. Of these, the lower part of the left part in front of the kick-up part 5b extends to cover the whole. Specifically, the first sub-under cover 220 extends from the front end of the floor panel 5 to the standing wall 5a and extends between the side sill 14a provided on the right side and the floor tunnel member 17a provided on the right side. The second sub under cover 320 extends from the front end of the floor panel 5 to the standing wall 5a and extends between the side sill 14b provided on the left side and the floor tunnel member 17b provided on the left side. . The first sub-under cover 220 and the second sub-under cover 320 are fixed to the lower surfaces of the first sub-reinforcing members 222 and 222 and the pair of front and rear second sub-reinforcing members 322 and 322, respectively, as described above.

  The pair of front and rear first sub-reinforcing members 222 and 222 each have a shape extending horizontally in the left-right direction from the right floor tunnel member 17a to the right side sill 14a. The first sub-reinforcing members 222 and 222 are disposed substantially parallel to each other in the front-rear direction, and the right ends of the first sub-reinforcing members 222 and 224 are fixed to the side sill 14a by fifth brackets 224 and 224, respectively. Thus, the left ends are fixed to the floor tunnel member 17a. On the other hand, the pair of front and rear second sub-reinforcing members 322 and 322 have shapes extending horizontally in the left-right direction from the left floor tunnel member 17b to the left side sill 14b. The second sub-reinforcing members 322 and 322 are disposed substantially parallel to each other in the front-rear direction. The left brackets of the second sub-reinforcing members 322 and 322 are fixed to the side sill 14b by the seventh brackets 324 and 324, respectively. , 325, each right end is fixed to the floor tunnel member 17b.

  The fifth bracket 224 has the same structure as the third bracket 124, and includes a plate-shaped fixing plate 224a and a square pipe-shaped surrounding portion 224b that protrudes substantially perpendicular to the fixing plate 224a. Consists of.

  The fifth bracket 224 is attached to the side sill 14a with bolts 94 or the like so that the fixing plate 224a extends along the side sill 14a and the surrounding portion 224b protrudes toward the left and right center. The fifth bracket 224 has the right end of the first sub-reinforcing member 222 inserted into the surrounding part 224b and fixed in the surrounding part 224b with a bolt 224c or the like, so that the first sub-reinforcing member 222 is fixed. Are connected to the side sill 14a. By this connection, the first sub reinforcing member 222 and the first sub under cover 220 fixed to the first sub reinforcing member 222 are fixed to the side sill 14a.

  Here, each of the sixth bracket 225, the seventh bracket 324, and the eighth bracket 325 has the same structure as the fifth bracket 224, and the sixth bracket 225 is fixed to the floor tunnel member 17a. The first sub-reinforcing member 222 and the floor tunnel member 17a are connected, and the seventh bracket 324 is fixed to the side sill 14b to connect the second sub-reinforcing member 322 and the side sill 14b. The bracket 325 is fixed to the floor tunnel member 17b and connects the second sub-reinforcing member 322 and the floor tunnel member 17b.

  In this manner, in the vehicle 1, the first sub reinforcing member 222 and the second sub reinforcing member 322 are fixed to the side sill 14 and the floor tunnel member 17, that is, the vehicle body by the brackets 224, 225, 324, and 325. The rigidity of the vehicle body itself is further enhanced by the first sub reinforcing member 222 and the second sub reinforcing member 322. In particular, the first sub-reinforcement member 222 and the second sub-reinforcement member 322 extend in the left-right direction. In the present vehicle 1, the torsional rigidity of the vehicle body is increased and the deformation of the vehicle body at the time of a side collision is effectively suppressed. Thus, it becomes possible to protect the occupant more reliably. Further, the floor panel 5 is made of a relatively thin plate-like member and may vibrate when traveling. However, as described above, the sub-under covers 220 and 320 are respectively attached to the lower side of the floor panel 5. This membrane vibration can be suppressed.

  As described above, in the vehicle 1, the front reinforcing member 22 and the rear reinforcing member 122 are respectively provided on the upper surfaces of the front under cover 20 and the rear under cover 120, and the front reinforcing member 22 and the rear reinforcing member 122 are connected to the front side. By fixing to the frame 10 and the rear side frame 110, the rigidity of the vehicle body itself can be increased in addition to the rigidity of the front under cover 20 and the rear under cover 120 while maintaining the rectifying effect below the vehicle body.

  In particular, the vehicle 1 has a simple structure in which the front reinforcing member 22 provided on the upper surface of the front under cover 20 is supported by the front side frame 10, and the platform such as the shape of the front side frame 10 is the same. Even if the vehicle is a vehicle of a different vehicle type, it can be handled by simply attaching the set of the front under cover 20 and the front reinforcing member 22 shown in FIG. 3 to the front side frame 10 of the vehicle. That is, it is possible to easily cope with different vehicle types without changing the design of the platform or the front under cover 20 and the like, and it is possible to reduce the cost. This effect can be similarly obtained with respect to the attachment of the rear under cover 120 and the rear reinforcing member 122.

  In the embodiment, the front under cover 20 is provided below the engine 3 as an under cover, and the rear under cover 120 is provided below the fuel tank 7 and the silencer 8 as an under cover. The position where the under cover is provided is not limited to these. Only one of the front under cover 20 and the rear under cover 120 may be provided. However, if the front under cover 20 is provided below the engine 3, the engine 3 can be protected. If the rear under cover 120 is provided below the fuel tank 7 and the silencer 8, the fuel tank 7 and the silencer 8 are protected. Can be protected.

  The first and second sub-under covers 220 and 320 and the first and second sub-reinforcing members 222 and 322 can be omitted. However, if these sub-under covers 220 and 320 are provided below the floor panel 5, the rectifying effect below the floor panel 5 can be maintained and the rigidity of the vehicle body can be further enhanced. Furthermore, it is possible to protect the floor panel 5 and suppress membrane vibration of the floor panel 5. The specific configuration of the first and second sub-reinforcing members 222 and 322 is not limited to the above. For example, as shown in FIG. 12, longitudinal reinforcing members 522 and 622 extending in the longitudinal direction may be fixed to the side sill 14 or the floor tunnel member 17 as sub-reinforcing members. In this case, the longitudinal rigidity of the vehicle body can be increased. Furthermore, you may make it provide a sub-reinforcement member in both the left-right direction and the front-back direction.

  Further, a specific structure for fixing the front reinforcing member 22 to the front side frame 10, a specific structure for fixing the rear reinforcing member 122 to the rear side frame 110 or the floor frame 18, the first and first The specific structure for fixing the two sub-reinforcing members 222 and 322 to the side sill 14 or the floor tunnel member 17 is not limited to the above. For example, a bracket 724 shown in FIG. 13 may be used instead of the first bracket 24 or the like. That is, by using this bracket 724 having a shape extending from the front under cover 20 to the front side frame 10 through the front reinforcing member 22, and fixing the upper end portion of the bracket 724 to the front side frame 10, The front under cover 20 may be fixed to the front side frame 10 with the front reinforcing member 22 supported on the upper surface of the front under cover 20.

It is a schematic bottom view of the vehicle provided with the vehicle body lower part structure concerning this invention. It is the II-II sectional view taken on the line of FIG. It is a schematic perspective view of the front undercover shown in FIG. It is a bottom view of the engine room 2 vicinity. It is a figure which shows the state which removed the front under cover and the front reinforcement member with respect to FIG. (A) It is an enlarged view of the 1st bracket vicinity. (B) It is the VI-VI sectional view taken on the line of (a). (A) It is an enlarged view of the 2nd bracket vicinity. (B) It is the VII-VII sectional view taken on the line of (a). It is a bottom view near a kick-up part. (A) It is an enlarged view of the 3rd bracket vicinity. (B) It is the IX-IX sectional view taken on the line of (a). FIG. 3 is a sectional view taken along line XX in FIG. 2. It is a figure which shows other embodiment of a sub reinforcement member. It is a figure which shows other embodiment of a 1st bracket.

Explanation of symbols

1 Vehicle 3 Engine 5 Floor Panel 7 Fuel Tank 8 Silencer 10 Front Side Frame (Side Frame)
12 Subframe 15 Floor tunnel 17 Floor tunnel member 20 Front under cover (under cover)
22 Front reinforcement member (Reinforcement member)
24 First bracket (supporting member)
25 Second bracket (support member)
109 Rear bumper face (bumper face)
110 Rear side frame (side frame)
112 Torsion beam (subframe)
120 Rear under cover (under cover)
124 3rd bracket 125 4th bracket (support member)
220 1st sub under cover (sub under cover)
222 1st sub reinforcement member (left-right direction reinforcement member)
320 2nd sub under cover (sub under cover)
322 Second sub reinforcing member (horizontal direction reinforcing member)
522 Front-rear direction reinforcing member 622 Front-rear direction reinforcing member

Claims (7)

A pair of left and right side frames extending in the longitudinal direction of the vehicle body;
A subframe connected to the side frame to support the suspension;
An under cover that is provided below the subframe and forms at least a part of the lower surface of the vehicle body;
A reinforcing member provided on the upper surface of the under cover and extending in the front-rear direction of the vehicle body;
The lower part structure of the vehicle body, wherein the reinforcing member is supported by the side frame in a state where the under cover is supported by a lower surface of the reinforcing member. The vehicle body lower structure according to claim 1,
A support member for supporting the reinforcing member on the side frame;
The vehicle body lower structure, wherein the support member has a shape extending from the reinforcing member to the side frame located above the reinforcing member. The vehicle body lower structure according to claim 1 or 2,
Equipped with an engine at the front of the car body,
The underbody structure of the vehicle body, wherein the under cover is disposed at a position covering a lower part of the engine. The vehicle body lower structure according to any one of claims 1 to 3,
It is equipped with a fuel tank, silencer and bumper face provided at the rear of the car body,
The under cover is disposed at a position covering the lower side of the fuel tank and the silencer,
A vehicle body lower structure, wherein a rear end portion of the under cover is supported by the bumper face. The vehicle body lower structure according to any one of claims 1 to 4,
A pair of side sills that are respectively disposed on the left and right sides of the vehicle body and extend in the vehicle body longitudinal direction;
A floor tunnel extending in the front-rear direction of the vehicle body so as to protrude upward in the vicinity of the center in the left-right direction of the floor panel constituting the lower surface of the passenger compartment;
A floor tunnel member provided in the floor tunnel and extending in the longitudinal direction of the vehicle body;
A sub-under cover provided below the floor panel and forming at least a part of the lower surface of the vehicle body;
A sub-reinforcing member provided on the upper surface of the sub-under cover,
The sub-reinforcement member is supported by at least one of the side sill and the floor tunnel member in a state where the sub-under cover is supported by the lower surface of the sub-reinforcement member. The vehicle body lower structure according to claim 5,
The sub-reinforcing member includes a left-right direction reinforcing member having a shape extending in the left-right direction of the vehicle body,
A vehicle body lower structure, wherein one end of the left-right reinforcing member in the left-right direction is supported by the side sill and the other end is supported by the floor tunnel member. The vehicle body lower structure according to claim 5 or 6,
The vehicle body lower structure, wherein the sub-reinforcing member includes a longitudinal reinforcing member having a shape extending in the longitudinal direction of the vehicle body.

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