JP6550720B2 - Vehicle bottom structure - Google Patents

Description

  The present invention relates to a vehicle lower surface structure provided with a predetermined protected member and an exhaust pipe on the lower surface of a floor panel of the vehicle.

  There are many installations such as fuel tanks and exhaust pipes on the lower surface of the floor panel of the vehicle. These installations are devised and arranged so that the limited space on the lower surface of the floor panel can be efficiently used. In particular, the exhaust pipe is a long structure extending from near the engine on the front side of the vehicle to the rear end of the vehicle, and is arranged to avoid other installation while curving or bending at various places.

  The end of the general exhaust pipe is provided with a silencer (muffler) and protrudes rearward from the vehicle body. Therefore, when a rear collision or the like occurs in the vehicle, the exhaust pipe is likely to be pushed toward the front of the vehicle, and may deform and come into contact with another installation object. Therefore, for example, in the vehicle body rear structure described in Patent Document 1, a member called a pressing bracket is provided in the vicinity of the rear end of the vehicle body. The pressing bracket has an inclined surface that is inclined downward and obliquely upward from the front of the vehicle, and contacts the silencer on the inclined surface when a rear collision or the like occurs. In Patent Document 1, the silencer is prevented from contacting the fuel tank by moving the silencer downward by the pressing bracket at the time of rear end collision.

JP 2004-148981 A

  However, contact between the exhaust pipe and another installation such as a fuel tank can occur not only in the silencer but also in the middle of the exhaust pipe. If there is a possibility of contact with the exhaust pipe, it is necessary to secure a certain amount of clearance between the other installation objects and the exhaust pipe, and the shape and arrangement thereof are limited. Such a restriction leads to a capacity restriction for a fuel tank, for example, which is not preferable.

  In view of such a problem, an object of the present invention is to provide a vehicle lower surface structure capable of preventing contact between a predetermined protected member on an under surface of a floor panel and an exhaust pipe.

  In order to solve the above problems, a typical configuration of a vehicle lower surface structure according to the present invention is installed on a vehicle floor panel, a predetermined protected member installed on the lower surface of the floor panel, and a lower surface of the floor panel. In a vehicle lower surface structure including an exhaust pipe extending from the front of the protected member to the rear end of the floor panel, the exhaust pipe includes a rear region extending from the rear end of the floor panel to the vicinity of the rear portion of the protected member, and the protected member. A first vicinity region that is bent from the rear region along the rear portion toward the vehicle width direction and extends to a position that does not overlap the protected member when viewed from the vehicle front-rear direction, and is bent forward from the first vicinity region to the vehicle front side. The lower surface structure of the vehicle is further disposed between the protected member and the first near region of the exhaust pipe, and at least a first lower surface of the lower surface of the floor panel from the lower surface Characterized in that it has a barrier member that protrudes to the height of the region.

  According to the above configuration, even if a force directed to the front of the vehicle is applied to the exhaust pipe by, for example, a rear end collision, the barrier member can prevent the exhaust pipe from contacting the protected member. Furthermore, since the barrier member can prevent the exhaust pipe from contacting the protected member, the required clearance between the exhaust pipe and the protected member can be reduced as compared with the case where the barrier member is not provided. Therefore, restrictions on the shape and arrangement of the protected members can be reduced, and the degree of freedom thereof can be increased.

  The above exhaust pipe further has a downward bending portion formed in the first vicinity area or the second vicinity area and bent downward from the rear of the vehicle toward the front of the vehicle, and the lower surface structure of the vehicle further lowers the exhaust pipe. You may provide the fixing member fixed to a floor panel ahead of a vehicle rather than a bending part.

  By providing the above-mentioned downward bent portion, when a force toward the front of the vehicle is applied to the exhaust pipe due to a rear collision or the like, the exhaust pipe is supported by the fixed portion, and a load is applied to the downward bent portion at the rear of the vehicle relative to the fixed portion. The exhaust pipe is deformed so as to be bent upward at the downward bent portion. That is, the exhaust pipe is deformed to approach the upper floor panel and the barrier member starting from the lower bending portion. Therefore, according to the above configuration, the exhaust pipe can be received by the barrier member, and the contact between the exhaust pipe and the member to be protected can be more efficiently prevented.

  The barrier member has a vertical wall portion extending downward from the lower surface of the floor panel in the vehicle front-rear direction, and a receiving surface that is bent and spreads from the edge of the vertical wall portion toward the first vicinity region from the vehicle rear edge. May be. By having the receiving surface, the barrier member can be in surface contact with the exhaust pipe, and the exhaust pipe can be suitably received.

  The vehicle lower surface structure may further include a cross member installed on the lower surface of the floor panel so as to extend across both ends of the floor panel in the vehicle width direction, and the barrier member may be connected to the cross member. The cross member has high rigidity even in the region constituting the lower surface of the floor panel. Therefore, if it is a cross member, it will be possible to install a barrier member more strongly.

  The protected member may include a vehicle fuel tank. The above-mentioned barrier member reduces the possibility of contact between the exhaust pipe and the fuel tank, thereby reducing the clearance required between them. That is, there is room in the fuel tank arrangement space. Therefore, the fuel tank can be easily arranged, and for example, the capacity can be increased.

  The barrier member may further include an attachment portion to which the fuel tank is attached. That is, the barrier member may be realized as a fixed bracket for the fuel tank. With this fixed bracket, it is possible to prevent the exhaust pipe from contacting the fuel tank while supporting the fuel tank.

  The rear portion of the fuel tank may be inclined to widen the fuel tank toward the front of the vehicle, and the first near region of the exhaust pipe may also be inclined along the rear portion of the fuel tank. Also with this configuration, a vehicle lower surface structure that can prevent contact between the fuel tank and the exhaust pipe can be realized.

  According to the present invention, it is possible to provide a vehicle lower surface structure capable of preventing contact between a predetermined protected member on the lower surface of the floor panel and the exhaust pipe.

It is the figure which showed the vehicle lower surface structure concerning embodiment of this invention. It is the elements on larger scale of the vehicle lower surface structure of Fig.1 (a). It is an expansion perspective view of the fixing bracket of FIG.2 (b). It is an enlarged view of the fixed bracket of Fig.3 (a). It is sectional drawing from each direction of the fixed bracket of FIG.2 (b).

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a view showing a vehicle lower surface structure 100 according to an embodiment of the present invention. Fig.1 (a) has illustrated the vehicle lower surface structure 100 seen from the downward direction of the vehicle. The vehicle lower surface structure 100 is implemented on the rear side of the vehicle 102. The floor panel 104 is configured by combining a plurality of panel members. The floor panel 104 is roughly divided into a main floor panel 108 in front of the fuel tank 106 and a rear floor panel 110 connected to the rear end of the main floor panel 108.

  A plurality of structural members are further attached to the floor panel 104. First, a pair of side members 112a and 112b are connected to both ends of the rear floor panel 110 in the vehicle width direction (vertical direction in FIG. 1A). Side members 112 a and 112 b extend in the vehicle longitudinal direction along side edges of the rear floor panel 110 in the vehicle width direction. A cross member 114 is connected across the side members 112a and 112b. Cross member 114 extends in the vehicle width direction to further improve the overall rigidity of floor panel 104.

  The configuration of the rear floor panel 110 will be described in detail. FIG.1 (b) is AA sectional drawing which cut | disconnected the rear floor panel 110 of Fig.1 (a) by the line segment of the vehicle front-back direction. As shown in FIG. 1 (b), the rear floor panel 110 is further configured by three panel members. First, a rear floor front panel 116 is provided in front of the vehicle. The rear floor front panel 116 is connected to the rear end of the main floor panel 108. The rear floor front panel 116 is bent upward at the rear of the main floor panel 108 to form a step 118.

  A rear floor center panel 120 is connected to the rear of the rear floor front panel 116 at the rear of the vehicle. The rear floor center panel 120 extends rearward substantially horizontally from the rear floor front panel 116, and a seat cushion of a rear seat (not shown) is placed on the upper surface thereof. A rear floor rear panel 122 is connected to the rear of the rear floor center panel 120. The rear floor rear panel 122 constitutes a luggage storage portion behind the rear seat. In the present embodiment, the rear floor rear panel 122 is formed with a storage portion 124 for spare tires (or various devices) that protrudes downward and protrudes downward.

  The fuel tank 106 is installed behind the stepped portion 118 of the rear floor panel 122. As shown in FIG. 1A, the fuel tank 106 is installed in an area surrounded by the pair of side members 112 a and 112 b and the cross member 114. The fuel tank 106 is a relatively large member that covers most of the rear floor panel 110 in the vehicle width direction. The fuel tank 106 has flange portions 126 at each edge, and is fastened and fixed to the cross member 114, the rear floor panel 110, and the like using bolts 128 or the like at the flange portions 126.

  A belt member 130 is passed over the fuel tank 106. The belt member 130 is made of metal, and is slanted across the fuel tank 106 in the vehicle width direction, and supports the fuel tank 106 from below (see FIG. 1B). As shown in FIG. 1A, in the present embodiment, the belt member 130 includes a position on the right end side (lower side in FIG. 1A) of the cross member 114 in the vehicle width direction and a step portion of the rear floor panel 110. It is fastened to a portion near the left end side (upper side in FIG. 1A) in the vehicle width direction near 118.

  An exhaust pipe 132 is also installed on the lower surface of the floor panel 104. The exhaust pipe 132 is a pipe for discharging engine combustion gas to the outside, and is also referred to as a muffler. The exhaust pipe 132 extends from a point ahead of the fuel tank 106 to the rear end 134 of the rear floor panel 110. The exhaust pipe 132 passes through a tunnel portion 136 at the center of the main floor panel 108 in the vehicle width direction on the vehicle front side. The exhaust pipe 132 extends rearward after avoiding the fuel tank 106 by bending or the like. The exhaust pipe 132 is provided with a silencer 138 (muffler) on the end side, and after reducing the noise of the gas, the gas is exhausted from the exhaust port 140.

  The exhaust port 140 of the exhaust pipe 132 projects rearward from the rear floor panel 110. Therefore, the exhaust pipe 132 may be pushed to the front of the vehicle, and may be deformed and moved, for example, if a rear collision or the like occurs in the vehicle. In preparation for such a case, in the vehicle lower surface structure 100, the fuel tank 106 is used as a member to be protected, and measures for preventing the exhaust pipe 132 from contacting the fuel tank 106 are taken.

  FIG. 2 is a partially enlarged view of the vehicle lower surface structure 100 of FIG. In FIG. 2A, the portion where the fuel tank 106 and the exhaust pipe 132 are close to each other is enlarged. The exhaust pipe 132 is bent along the rear portion 142 of the fuel tank 106 to avoid the fuel tank 106.

  2B is a diagram in which the fuel tank 106 and the belt member 130 in FIG. 2A are omitted. The fuel tank 106 of FIG. 2 (a) is fastened and fixed to the fixed bracket 144 of FIG. 2 (b). The fixing bracket 144 is provided at a position where the flange portion 126 in the middle of the inclined rear portion 142 of the fuel tank 106 overlaps. In the present embodiment, the fixing bracket 144 realizes a function as a barrier member that prevents the exhaust pipe 132 and the fuel tank 106 from coming in contact with each other.

  Prior to a detailed functional description of the fixing bracket 144, the configuration of the exhaust pipe 132 will be further described. As shown in FIG. 1A, the rear region 146 of the exhaust pipe 132 extends from the vicinity of the rear portion 142 of the fuel tank 106 to the rear end 134 of the rear floor panel 104. A region of the exhaust pipe 132 near the rear portion 142 of the fuel tank 106 is a first vicinity region 148.

  As shown in FIG. 2A, the rear portion 142 of the fuel tank 106 is inclined so that the fuel tank 106 becomes wider toward the front of the vehicle. The first vicinity region 148 is bent at the first bent portion 150 from the rear region 146 to the outside in the vehicle width direction (hereinafter referred to as the vehicle outside), and along the rear portion 142 of the fuel tank 106 with respect to the vehicle longitudinal direction. It extends at an angle. In the present embodiment, the first near region 148 extends from the first bending portion 150 to a position not overlapping the fuel tank 106 when viewed from the longitudinal direction of the vehicle.

  A second neighborhood region 152 is provided in front of the vehicle in the first neighborhood region 148. The second near region 152 is bent forward from the first near region 148 at a second bending portion 154 and extends along the outer side of the fuel tank 106. The second near region 152 is fixed to the side member 112 a by a fixing member 156 (also referred to as a muffler hanger). In front of the vehicle in the second vicinity region 152, the exhaust pipe 132 overlaps the lower side of the fuel tank 106 (the front side in FIG. 2 (a)) on the inner side in the vehicle width direction (hereinafter referred to as the vehicle inner side). It is bent. At this point, the fuel tank 106 is recessed to avoid the exhaust pipe 132, and the fuel tank 106 and the exhaust pipe 132 are not in contact with each other. Then, the exhaust pipe 132 extends to the tunnel portion 136 (see FIG. 1A), and is directed from there to the front of the vehicle.

  FIG. 3 is an enlarged perspective view of the fixing bracket 144 of FIG. In FIG. 3A, the belt member 130 is also illustrated. As shown in FIG. 3A, the fixing bracket 144 is also fastened to the belt member 130 and supports the fuel tank 106 (see FIG. 2A). The fixing bracket 144 is provided between the fuel tank 106 and the first near region 148 of the exhaust pipe 132. The fixing bracket 144 receives the first vicinity region 148 of the exhaust pipe 132 that has moved from the rear of the vehicle (in the diagonally lower right in FIG. 3A) in an emergency, and the first vicinity region 148 contacts the fuel tank 106. To prevent.

  FIG. 3B is a diagram in which the belt member 130 and the exhaust pipe 132 of FIG. In the present embodiment, the fixing bracket 144 is installed on the cross member 114. The cross member 114 has a high rigidity in the region constituting the lower surface of the floor panel 104. In this manner, the fixing bracket 144 can be installed on the cross member 114 to have higher installation strength and can fully receive the first near region 148 (see FIG. 3A). Yes.

  FIG. 4 is an enlarged view of the fixing bracket 144 of FIG. As shown in FIG. 4, the fixing bracket 144 has vertical wall portions 158 on both sides in the vehicle width direction. The vertical wall portion 158 extends downward (upward in FIG. 4) while having a certain width over the front and back of the vehicle. Below the vertical wall portions 158 on both sides, the top surface portion 160 is connected. An attachment portion 162 is provided on the top surface portion 160. The mounting portion 162 is realized as a bolt hole in the present embodiment, and is fastened to the flange portion 126 of the fuel tank 106 (see FIG. 2A) and the belt member 130 by bolts 128.

  FIG. 5 is a cross-sectional view of the fixing bracket 144 of FIG. Fig.5 (a) is BB sectional drawing which cut | disconnected the vehicle lower surface structure of FIG. 2 (b) by the line segment of the vehicle front-back direction. As shown in FIG. 5A, the fixing bracket 144 protrudes downward from the lower surface of the rear floor panel 110 to at least the height of the first vicinity region 148. The fixed bracket 144 protrudes to this height, so that when the exhaust pipe 132 is subjected to a force from the rear of the vehicle and is deformed and moved forward, the fuel tank 106 (FIG. 2) is received. Contact with (see (a)) can be prevented.

  FIG.5 (b) is CC sectional drawing which cut | disconnected the vehicle lower surface structure of the vehicle of Fig.5 (a) by the line segment extended to a vehicle width direction and an up-down direction. As shown in FIG. 5 (b), the fixing bracket 144 is provided in front of the vehicle in the middle of the first near region 148. By providing the fixing bracket 144 at this position, it is possible to efficiently receive the first vicinity region 148 when the exhaust pipe 132 is deformed and moved forward by the force applied from the rear of the vehicle. It has become.

  A receiving surface 164 is formed on the fixed bracket 144. As shown in FIG. 4, the receiving surface 164 extends from the vehicle rear edge of the vertical wall portion 158 to the vehicle outer side (lower left side in FIG. 4) so as to face the first vicinity region 148. By having the receiving surface 164, the fixing bracket 144 can come into surface contact with the first vicinity region 148 of the exhaust pipe 132 and has a strong shape that can withstand contact with the first vicinity region 148. 148 can be suitably received.

  Reference is again made to FIG. A downward bent portion 166 is provided in the first vicinity region 148. In the lower bending portion 166, the first near region 148 is bent downward from the rear of the vehicle toward the front of the vehicle. Then, the exhaust pipe 132 is fixed to the side member 112 a of the floor panel 104 by the fixing member 156 in front of the lower bent portion 166 in the vehicle.

  With the above configuration, when a force toward the front of the vehicle is applied to the exhaust pipe 132 due to a rear collision or the like, the exhaust pipe 132 is supported by the fixed member 156, and a load is applied to the downward bent portion 166 at the rear of the vehicle with respect to the fixed member 156. Are concentrated and deformed so as to be bent upward from the downward bent portion 166 as a starting point. That is, the exhaust pipe 132 is deformed so as to approach the upper fixing bracket 144 by providing the lower bent portion 166. Therefore, according to this configuration, the exhaust pipe 132 is received by the fixing bracket 144, and the contact between the exhaust pipe 132 and the fuel tank 106 can be prevented more efficiently.

  As described above, in the vehicle lower surface structure 100, the fixing bracket 144 reduces the possibility of contact between the exhaust pipe 132 and the fuel tank 106. The required clearance can be reduced. That is, by implementing the vehicle lower surface structure 100, a space for the fuel tank 106 can be provided. Therefore, the fuel tank 106 can be easily arranged, and for example, its capacity can be increased.

  In the present embodiment, the fuel tank 106 is installed at the center side of the floor panel 104 in the vehicle width direction, and the first vicinity region 148 of the exhaust pipe 132 is the front of the vehicle from the inside of the vehicle behind the fuel tank 106. It extends toward the outside of the car. However, the present invention is not limited to this, and the fuel tank 106 may be installed at a position deviated in the vehicle width direction with respect to the floor panel 104. It is good also as a structure extended in any of a vehicle width direction toward it.

  In this embodiment, the member to be protected from contact with the exhaust pipe 132 is the fuel tank 106, and the barrier member that receives the exhaust pipe 132 is the fixed bracket 144. However, the technical idea of the vehicle undersurface structure 100 is not intended to be applied to only these, and may be applied to other things. Besides the fuel tank 106, various protected members such as a height sensor, a torsion beam, a fuel pipe and a brake pipe, a canister and a parking brake cable are provided on the lower surface of the floor panel 104. By applying the technical idea of the vehicle lower surface structure 100, it is possible to reduce restrictions on the shape and arrangement of these various protected members and to increase the degree of freedom thereof.

  Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the appended claims, and of course these also fall within the technical scope of the present invention. Understood.

  The present invention can be applied to a vehicle lower surface structure provided with a predetermined protected member and an exhaust pipe on the lower surface of the floor panel of the vehicle.

DESCRIPTION OF SYMBOLS 100 ... Vehicle lower surface structure, 102 ... Vehicle, 104 ... Floor panel, 106 ... Fuel tank, 108 ... Main floor panel, 110 ... Rear floor panel, 112a ... Vehicle right side member, 112b ... Vehicle left side member, 114 ... Cross Member, 116: rear floor front panel, 118: step portion, 120: rear floor center panel, 122: rear floor rear panel, 124: storage portion, 126: flange portion, 128: bolt, 130: belt member, 132: exhaust pipe, 134: ... Rear end of rear floor panel, 136 ... tunnel portion, 138 ... silencer, 140 ... exhaust port, 142 ... inclined rear portion of fuel tank, 144 ... fixed bracket, 146 ... rear region, 148 ... first neighborhood region, 150 ... first Bending portion, 152 ... second vicinity region, 154 ... second bending , 156 ... fixing member, 158 ... vertical wall, 160 ... top portion, 162 ... attachment portion, 164 ... supporting surface, 166 ... lower bent portion

Claims (6)

A vehicle floor panel;
A predetermined protected member installed on the lower surface of the floor panel;
In the vehicle lower surface structure comprising an exhaust pipe installed on the lower surface of the floor panel and extending from the vehicle front of the protected member to the rear end of the floor panel,
The exhaust pipe is
A rear region extending from the rear end of the floor panel to the vicinity of the rear of the protected member;
A first vicinity region that is bent in the vehicle width direction from the rear region along the rear portion of the protected member and extends to a position that does not overlap the protected member when viewed from the vehicle front-rear direction;
And a second near region which is bent and extends from the first near region to the front of the vehicle,
The vehicle lower surface structure further includes
A barrier member installed between the protected member and the first vicinity region of the exhaust pipe and projecting downward from the lower surface of the floor panel to at least the height of the first vicinity region;
The barrier member is located in front of the vehicle in the middle of the first near area ,
The exhaust pipe further includes a downward bending portion formed in the first near region and bending downward from the rear of the vehicle toward the front of the vehicle,
The vehicle underside structure further vehicle underside structures characterized by Rukoto comprising a fixing member for fixing the exhaust pipe to the floor panel in the vehicle forward of the lower bent portion. The barrier member is
A vertical wall extending downward from the lower surface of the floor panel in the longitudinal direction of the vehicle;
2. The vehicle lower surface structure according to claim 1 , further comprising: a receiving surface that bends and spreads so as to face the first vicinity region from a vehicle rear edge of the vertical wall portion. The vehicle lower surface structure further includes
The under surface of the floor panel is provided with a cross member installed so as to extend across both ends of the floor panel in the vehicle width direction,
The barrier member is a vehicle bottom surface structure according to claim 1 or 2, characterized in that it is connected to the cross member. The vehicle undersurface structure according to any one of claims 1 to 3 , wherein the member to be protected includes a fuel tank of the vehicle. The undersurface structure of a vehicle according to claim 4 , wherein the barrier member further includes a mounting portion to which the fuel tank is mounted. The rear part of the fuel tank is inclined so that the fuel tank becomes wider toward the front of the vehicle, and the first vicinity region of the exhaust pipe is also inclined along the rear part of the fuel tank. The vehicle lower surface structure according to claim 4 or 5 .

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