JP2010234994A - Exhaust system arrangement structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress damage to a tail pipe in a rear-end collision of a vehicle, and to sufficiently ensure a storage space of a baggage in a rear part of the vehicle, while maintaining the reducing function of exhaust noise with a muffler. <P>SOLUTION: In an exhaust system arrangement structure of a vehicle, a muffler 7 for reducing the exhaust noise of an engine and a tail pipe 8 connected to the muffler 7 are arranged behind a suspension 6 for rear wheels arranged below a rear floor panel 4 forming a floor of a baggage compartment in a rear part of a vehicle body. A recessed part 26 recessed on the lower side is juxtaposed on the rear floor panel 4 together with the muffler 7, and the tail pipe 8 is installed extending to a rear side of the vehicle below the recessed part 26. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle exhaust system in which a silencer for reducing exhaust noise of an engine and a tail pipe connected to the silencer are disposed below a rear floor panel forming a cargo floor at the rear of a vehicle body. The present invention relates to an arrangement structure.

  Conventionally, as shown in Patent Document 1 below, in an engine exhaust system, the capacity of a silencer (exhaust silencer) is increased as much as possible in a limited space, and the silencer and the exhaust pipe are included. For the purpose of improving the support balance and support rigidity of the exhaust system, a silencer with a substantially rectangular parallelepiped that is flat in the vertical direction and is disposed on top of the side frame at the rear of the vehicle body when viewed from the bottom of the vehicle body, Inserted and fixed to the first exhaust pipe connected to the front end face of the silencer on the inner side in the width direction and the openings formed in the two front and rear sides of the side frame, and supports the front and rear ends of the silencer First and second mount rubbers, and a third mount rubber that supports the first exhaust pipe at the lower part of the vehicle body, and the first to third mount rubbers form a triangular shape in a bottom view. Exhaust system arranged to the engine are known.

  Further, as shown in Patent Document 2 below, for the purpose of making it possible to introduce under-floor passing air into the final reduction gear without increasing the number of parts, a tunnel portion extending in the front-rear direction on the vehicle body floor is provided. A propeller shaft and an exhaust pipe are disposed on the inner side of the side, and a final reduction gear is provided at the rear end of the propeller shaft, and in the vehicle width direction across the both sides of the lower end of the tunnel portion on the vehicle body front side of the final reduction gear A reinforcing member is arranged on the end, and a first wind guide portion is formed in the reinforcing member to take the passing air under the floor generated during traveling of the vehicle into the tunnel portion and guide it to the final reduction device. A vehicle body underfloor structure configured to actively cool the vehicle is known.

JP 2005-325802 A JP-A-2005-170278

  As disclosed in Patent Document 1, a flat silencer is disposed so as to overlap the side frame at the rear of the vehicle body when viewed from the bottom of the vehicle body, and the vehicle width direction outer side position on the rear end surface of the silencer When the tail pipe is connected to the rear side of the vehicle and protrudes on the rear side of the vehicle, a silencer having a predetermined capacity can be disposed in a limited space while preventing the vertical and rear dimensions of the rear part of the vehicle body from increasing. There is an advantage. However, as disclosed in FIG. 1 of the above-mentioned Patent Document 1, a silencer is disposed on one side of the spare tire pan in the bottom view of the vehicle body, and from the rear surface toward the rear side of the vehicle. In the case of a structure in which a tail pipe is protruded, there is a problem that the tail pipe is easily damaged at the time of rear collision of the vehicle.

  In other words, the rear impact accident of a vehicle often involves the input of a collision load from either the rear left or right side of the vehicle body, and in a vehicle with a tail pipe protruding from the side portion of the rear end of the vehicle body as described above, When another vehicle collides with the installation portion side of the tail pipe, it was not possible to prevent the collision load from acting on the tail pipe and damaging the tail pipe. In order to improve the exhaust noise reduction function by the silencer, it is desired to increase the total length of the tail pipe as much as possible. However, if the rear projecting amount of the tail pipe is set large, the tail pipe is There was a drawback that it was more easily damaged at the time of rear-end collision.

  Further, even when a pair of silencers are disposed on the left and right of the rear part of the vehicle body as in the vehicle underfloor structure according to Patent Document 2, the vertical dimension and the front and rear dimension of the rear part of the vehicle body are suppressed from increasing, It is possible to arrange a silencer having a predetermined capacity in the defined space. However, in this configuration, it is inevitable that the rear impact load of the vehicle acts on one of the tail pipes disposed on the left and right of the rear part of the vehicle body at the time of the rear impact of the vehicle. There is a drawback that it is easy to do.

  In order to improve the fuel consumption and movement performance of the vehicle, it is preferable to make the vehicle body as small as possible and to lower the floor, but a silencer having a predetermined capacity is used together with a fuel tank and a suspension for the rear wheels. When the structure is arranged below the rear floor panel, it is difficult to secure a sufficient space for storing luggage at the rear of the vehicle, and it has been desired to improve this point.

  In view of the above points, the present invention can effectively improve the exhaust noise reduction function by the silencer, can suppress the damage of the tail pipe at the time of rear-end collision of the vehicle, and accommodates luggage at the rear portion of the vehicle. The purpose is to ensure sufficient space.

  According to a first aspect of the present invention, there is provided a silencer for reducing engine exhaust noise behind a rear wheel suspension disposed below a rear floor panel forming a cargo floor at the rear of the vehicle body, and the silencer An exhaust system arrangement structure of a vehicle in which a tail pipe to be connected is arranged, and a recessed portion recessed on a lower side is provided side by side with the silencer on the rear floor panel, and The tail pipe is installed so as to extend to the rear side of the vehicle passing under the recessed portion.

  According to a second aspect of the present invention, in the exhaust system arrangement structure for a vehicle according to the first aspect, the tail pipe is installed so as to extend from the vicinity of the center in the vehicle width direction to the rear side of the vehicle body.

  According to a third aspect of the present invention, in the vehicle exhaust system arrangement structure according to the first or second aspect, an engine disposed in a front portion of the vehicle and the muffler are connected to the lower side of the rear floor panel. The exhaust pipe is provided, and at least a part of the exhaust pipe is provided so as to pass below the recessed portion.

  According to a fourth aspect of the present invention, in the exhaust system arrangement structure for a vehicle according to any one of the first to third aspects, the silencer is arranged on both right and left sides of the recessed portion in the vehicle width direction. It is a thing.

  According to a fifth aspect of the present invention, in the exhaust system arrangement structure for a vehicle according to any one of the first to fourth aspects, a drive system for transmitting the driving force of the engine to the rear wheels is provided below the rear floor panel. A wheel house that houses rear wheels is formed on the left and right sides of the drive system in the vehicle width direction, the silencer is disposed behind the wheel house, and the exhaust pipe is connected to the suspension and the drive. It is piped so as to pass under the system and connected to the silencer.

  According to a sixth aspect of the present invention, in the vehicle exhaust system arrangement structure according to any one of the third to fifth aspects, the lower surface of the silencer projects downward from the lower surface of the recessed portion. The tail pipe and the exhaust pipe are respectively connected to the inner side surface in the vehicle width direction of the silencer.

  According to a seventh aspect of the present invention, in the exhaust system arrangement structure for a vehicle according to any one of the first to sixth aspects, a sub trunk portion capable of communicating with the rear cargo compartment is provided in the recessed portion. It has been done.

  In the invention according to claim 1, since the recessed portion formed on the rear floor and the silencer are arranged side by side in the vehicle width direction at a position where interference with the rear wheel suspension can be avoided, There is no situation where the installation depth of the recessed portion is limited as in the case where the silencer is disposed below the recessed portion, and the exhaust is excellent by sufficiently securing the capacity of the silencer. In addition to obtaining a sound reduction function, there is an advantage that a sufficient space can be secured in the rear part of the vehicle by setting the capacity of the recessed portion large. In addition, by positioning the downstream end of the tail pipe closer to the center in the vehicle width direction than the silencer, the tail pipe is projected straight from the rear end surface of the silencer to the rear side of the vehicle. The tail pipe can be made sufficiently large in length, thereby effectively improving the exhaust noise reduction function by the silencer, and at the rear of the vehicle where another vehicle collides with the rear side of the vehicle body. Even when a crash occurs, a collision load is not input to the downstream end portion of the tail pipe, and there is an advantage that the damage can be effectively prevented.

  In the invention according to claim 2, since the tail pipe is installed so as to extend from the vicinity of the center in the vehicle width direction to the rear side of the vehicle body, except for the case where another vehicle collides near the center of the vehicle width direction on the rear surface of the vehicle body, The tail pipe can be prevented from being damaged at the time of a collision, and while avoiding interference with the recessed portion, the tail pipe can be effectively increased in total length to obtain an excellent exhaust noise reduction function. is there.

  In the invention according to claim 3, an exhaust pipe for connecting the engine and the silencer is provided below the rear floor panel, and at least a part of the exhaust pipe is piped so as to pass below the recessed portion. The exhaust pipe can be efficiently routed by effectively using the space below the recessed portion.

  In the invention according to claim 4, since the pair of left and right silencers are disposed on the left and right sides of the recessed portion in the vehicle width direction, the silencer of the silencer is compared with the case where the silencer is disposed only on one side of the recessed portion. The total capacity can be set to double, and the space provided in the left and right sides of the recessed portion can be fully utilized to effectively improve the exhaust silencing effect, and the space below the recessed portion By effectively utilizing the above, there is an advantage that the exhaust pipe, the tail pipe and the like can be efficiently realized with respect to the both silencers.

  In the invention according to claim 5, a drive system that transmits the driving force of the engine to the rear wheels is disposed below the rear floor panel, and a wheel house that accommodates the rear wheels is formed on the left and right sides of the drive system in the vehicle width direction. In addition, the silencer is disposed behind the wheel house, and the exhaust pipe is piped and connected to the silencer so as to pass under the suspension and the drive system, so that the capacity of the silencer is sufficient. The silencer can be disposed on the side of the rear floor panel in the vehicle width direction without interfering with the suspension, and the exhaust pipe and the tail pipe can be appropriately connected to the silencer. .

  In the invention which concerns on Claim 6, the lower surface of the said muffler is installed so that it may protrude below the lower surface of a recessed part, and the said tail pipe and an exhaust pipe are set to the vehicle width direction inner side surface of the said muffler. Since they are respectively connected, the tail pipe and the downstream part of the exhaust pipe are installed straight so as to extend in the vehicle width direction along the lower surface of the recessed part in the front view of the vehicle, and the end part thereof is connected to the silencer. It can be easily and properly connected. In addition, the tail pipe and the exhaust pipe are connected to each other as in the case where the lower surface of the silencer and the recessed portion are set at the same height and the tail pipe and the exhaust pipe are provided along the lower surface of the recessed portion. Properly route the tail pipe and exhaust pipe along the lower surface of the recessed portion while effectively preventing contact with the road surface when the vehicle is running due to being installed at an excessively low position. There is an advantage that it can be connected to the silencer and can effectively prevent the aerodynamic characteristics of the vehicle from being impaired.

  In the invention according to claim 7, since the sub-trunk portion capable of communicating with the rear cargo compartment is provided in the concave portion, the rear cargo compartment and the concave portion can be efficiently used as a luggage storage portion. In addition, there is an advantage that the tail pipe and the exhaust pipe can be appropriately arranged below the sub trunk portion.

It is a top view which shows the exhaust system arrangement | positioning structure of the vehicle which concerns on 1st Embodiment of this invention. It is a top view which shows arrangement | positioning structures, such as an exhaust system and a suspension. It is side surface sectional drawing which shows the arrangement | positioning structure of an exhaust system and a subtrunk part. It is a back sectional view showing the arrangement structure of an exhaust system and a sub trunk part. It is a perspective view which shows the specific structure of the suspension for rear wheels. It is a top view which shows the specific structure of the suspension for rear wheels. It is a top view which shows the exhaust system arrangement | positioning structure of the vehicle which concerns on 2nd Embodiment of this invention.

  1 to 4 show an exhaust system arrangement structure for a vehicle according to a first embodiment of the present invention. This vehicle has a floor panel 2 constituting the floor surface of the passenger compartment 1 and a rear floor panel 4 forming a floor surface of the rear cargo compartment 3 disposed behind the floor panel 2. Suspensions 6 for the rear wheels 5 are disposed on the lower left and right sides of the rear floor panel 4. A pair of left and right silencers 7 for reducing engine exhaust noise and a pair of silencers 7 are disposed behind the suspension 6. A tail pipe 8 serving as a connected exhaust gas outlet is provided.

  A floor tunnel portion 9 that bulges upward is installed at the center of the floor panel 2 in the vehicle width direction so as to extend in the front-rear direction of the vehicle. A shaft 10 is disposed. Then, the driving force of the engine is transmitted to the left and right rear wheels 5 and 5 through a drive system having the propeller shaft 10, a differential 11 provided at the rear end thereof, and a drive shaft 12. ing.

  On the left and right sides of the rear portion of the floor panel 2 are formed kick-up portions 13 that rise obliquely rearward. In addition, rear side frames 14 are installed on the left and right side portions of the rear floor panel 4 so as to extend in the front-rear direction of the vehicle along the lower surface thereof. Furthermore, a wheel house 15 for accommodating the rear wheel 5 is formed on the left and right of the front portion of the rear floor panel 4, and a suspension 6 for supporting the rear wheel 5 is installed below the wheel house 15.

  For example, as shown in FIGS. 5 and 6, the suspension 6 for the rear wheel 5 is configured to connect the wheel support 21 of the rear wheel 5 to the vehicle body with a stroke by five I-links 16 to 20 and to cushion the vehicle. It comprises a preload type multi-link suspension configured to apply a biasing force (preload) to the elastic bushes of the links 16 to 20 using the vertical reaction force of the device 24.

  Each of the I-links includes two upper links 16 and 17 on the front and rear sides of the vehicle that virtually constitute the upper arm, and two lower links 18 and 19 on the front and rear sides of the vehicle that virtually constitute the lower arm. And a toe control link 20 that restricts the rotational displacement of the rear wheel 5 around the virtual kingpin axis determined by the arrangement of the virtual upper arm and the lower arm. The upper links 16 and 17 and the lower links 18 and 19 swing up and down around the end of the vehicle body, so that the wheel support 21 and the rear wheel 5 are moved up and down along a predetermined locus. Is configured to do.

  The shock absorber 24 has a vertically long cylindrical shape in which the coil spring 22 and the damper 23 are arranged substantially coaxially, and a cylindrical bracket 25 disposed on the upper end side of the shock absorber 24 is attached to the vehicle body. The lower end portion of 23 is pivotally attached to the inner side of the vehicle body of the wheel support 21. A reaction force (upper and lower reaction force of the shock absorber) of the coil spring 22 and the damper 23 corresponding to the shared load at the rear of the vehicle body and the stroke of the rear wheel 5 acts on the wheel support 21.

  In the rear floor panel 4, the recessed portion 26 communicating with the upper rear luggage compartment 3 is located at a position where interference with the suspension 6 for the rear wheel 5 can be avoided, that is, in a range located on the rear side of the wheel house 15. And it is recessed below in the range over the substantially whole region between the said rear side frames 14 and 14. As shown in FIG. The silencer 7 is disposed on the rear side of the wheel house 15 formed on the left and right sides of the rear floor panel 4 so that the silencer 7 and the recessed portion 26 are arranged in the vehicle width direction. The sound absorbers 7 are arranged side by side so that the lower surface of the silencer 7 protrudes downward from the lower surface of the recessed portion 26.

  A box-shaped storage portion 27 that constitutes a sub-trunk portion for storing a load is inserted into the recessed portion 26 and is detachably locked by a locking tool (not shown). An opening / closing lid 28 is installed on the upper surface of the box-shaped storage portion 27 as necessary, so that a flat floor is formed over substantially the entire rear luggage compartment 3, and the opening / closing lid 28. It is configured so that articles can be taken in and out of the box-shaped storage portion 27 in a state in which is opened.

  The silencer 7 includes an upstream pipe 29 disposed in the floor tunnel portion 9 so as to extend in the front-rear direction of the vehicle, and a pair of left and right downstream pipes 30 connected to the rear end portion thereof. Is connected to an unillustrated engine disposed in the front part of the vehicle body through an exhaust pipe 31 having The downstream pipe 30 of the exhaust pipe 31 passes under the recessed portion 26 formed in the rear floor panel 4 and passes under the drive system including the drive shaft 12 and the suspension 6 and in the vehicle width direction. The pipe is extended so as to extend outward, and the downstream end of the downstream pipe 30 is connected to the inner side in the vehicle width direction of the silencer 7 and in front of the lower side.

  The upstream end of the tail pipe 8 is connected to the inner side surface in the vehicle width direction of the silencer 7 and behind the lower side. The tail pipe 8 passes under the recessed portion 26 from the upstream side portion 32 extending in the vehicle width direction through the lower portion of the recessed portion 26 and the downstream end portion positioned on the center side in the vehicle width direction. And a downstream side portion 33 extending to the rear side of the vehicle. The downstream side portions 33 of the tail pipes 8 connected to the pair of silencers 7 disposed on the left and right sides of the recessed portion 26 in the vehicle width direction are respectively located near the middle in the vehicle width direction. Projecting toward the rear end face of the vehicle.

  As described above, the silencer 7 for reducing engine exhaust noise is disposed behind the suspension 6 for the rear wheel 5 disposed below the rear floor panel 4 forming the cargo floor at the rear of the vehicle body, and the silencer. In the exhaust system arrangement structure in which the tail pipe 8 connected to the exhaust pipe 7 is arranged, the rear floor panel 4 is provided with a recessed portion 26 recessed in the lower side in parallel with the silencer 7. In addition, since the tail pipe 8 is configured to extend to the rear side of the vehicle through the lower portion of the recessed portion 26, the exhaust noise reduction function by the silencer 7 can be effectively improved, There is an advantage that damage to the tail pipe 8 at the time of rear-end collision of the vehicle can be suppressed, and a space for accommodating luggage can be effectively secured in the rear portion of the vehicle.

  In other words, in the first embodiment, the recessed portion 26 communicating with the upper rear luggage compartment 3 is located at a position where the interference with the suspension 6 for the rear wheel 5 can be avoided, and is substantially between the rear side frames 14 and 14. Since it is arranged in the range over the entire area, the capacity of the recessed portion 26 can be set large to secure a sufficient space for accommodating luggage at the rear of the vehicle. Moreover, since the concave portion 26 and the silencer 7 are arranged side by side in the vehicle width direction, the concave portion 26 is installed as in the case where the silencer 7 is arranged below the concave portion 26. There is an advantage that an excellent exhaust noise reduction function can be obtained by sufficiently securing the capacity of the silencer 7 without causing a situation where the depth is limited.

  Then, an upstream side portion 32 extending in the vehicle width direction through the lower portion of the recessed portion 26, and a downstream end located on the vehicle width direction central portion side, passing under the recessed portion 26 and the rear side of the vehicle. Since the tail pipe 8 is constituted by the downstream side portion 33 extending to the side, the tail pipe 8 has a sufficiently long overall length as compared with the tail pipe that projects straight from the rear end surface of the silencer 7 to the rear side of the vehicle. Accordingly, the exhaust noise reduction function of the silencer 7 can be effectively improved.

  Further, by installing the tail pipe 8 so as to extend to the rear side of the vehicle along the lower surface of the recessed portion 26, the downstream side portion 33 of the tail pipe 8 is arranged in the vehicle width direction more than the installation portion of the silencer 7. Since the structure is located on the center side, a collision load is input to the downstream side portion 33 of the tail pipe 8 even when a rear-end collision occurs when another vehicle collides with the rear side of the vehicle body. There is an advantage that the damage can be effectively prevented. In particular, as shown in the first embodiment, when the downstream side portion 33 of the tail pipe 8 is installed so as to extend from the vicinity of the center in the vehicle width direction to the rear side of the vehicle body, in the vicinity of the center in the vehicle width direction on the rear surface of the vehicle body. There is an advantage that the tail pipe 8 can be prevented from being damaged at the time of rear-end collision of the vehicle, except when another vehicle collides. In addition, there is an advantage that an excellent exhaust noise reduction function can be obtained by effectively increasing the total length of the tail pipe 8 while avoiding interference with the recessed portion 26.

  In the first embodiment, an exhaust pipe 31 including an upstream pipe 29 and a downstream pipe 30 that connect the engine disposed in the front portion of the vehicle and the silencer 7 is provided below the rear floor panel 4. Since at least a part of the exhaust pipe 31, specifically, the downstream pipe 30 is piped along the lower surface of the recessed portion 26, the space below the recessed portion 26 is effectively used to The exhaust pipe 31 can be efficiently routed.

  Furthermore, as shown in the first embodiment, when a pair of left and right silencers 7 are arranged on both the left and right sides of the recessed portion 26 in the vehicle width direction, the silencer 7 is disposed only on one side of the recessed portion 26. Compared with the case where it arrange | positions, the total capacity | capacitance of the silencer 7 can be set to double. Therefore, the space provided on the left and right side portions of the recessed portion 26 can be fully utilized to effectively improve the exhaust silencing effect, and the space below the recessed portion 26 can be effectively used. By doing so, there is an advantage that the exhaust pipe 31 and the tail pipe 8 can be efficiently handled with respect to both the silencers 7.

  In the first embodiment, a drive system including a propeller shaft 10, a differential 11 and a drive shaft 12 that transmits the driving force of the engine to the rear wheels 5 is disposed below the rear floor panel 4, and the drive A wheel house 15 for accommodating the rear wheel 5 is formed on the left and right sides of the vehicle in the vehicle width direction, the silencer 7 is disposed behind the wheel house 15, and the exhaust pipe 31 is connected to the suspension 6 and the drive system. The silencer 7 is connected to the silencer 7 so as to pass below the silencer 7. Therefore, the silencer 7 is disposed on the side of the rear floor panel 4 in the vehicle width direction without interfering with the suspension 6. There is an advantage that the exhaust pipe 31 and the tail pipe 8 can be appropriately connected to the silencer 7 while ensuring a sufficient capacity.

  Furthermore, as shown in the said 1st Embodiment, it installs so that the lower surface of the silencer 7 may protrude below the lower surface of the recessed part 26, and the said tail pipe 8 and the exhaust pipe 31 are connected to the said silencer 7 When the vehicle is connected to the inner side surface in the vehicle width direction, the tail pipe and the downstream pipe 31 of the exhaust pipe 30 extend in the vehicle width direction along the lower surface of the recessed portion 26 in a front view of the vehicle. Thus, it is possible to connect the end portion to the silencer 7 easily and appropriately.

  Although it is possible to set the lower surfaces of the silencer 7 and the recessed portion 26 to the same height and to connect the tail pipe 8 and the exhaust pipe 31 along the lower surface of the recessed portion 20, When configured in this way, the tail pipe 8 and the exhaust pipe 31 may be installed at an excessively low position so as to come into contact with the road surface when the vehicle travels, and the aerodynamic characteristics of the vehicle may be impaired. is there. On the other hand, when the lower surface of the silencer 7 is installed so as to protrude below the lower surface of the recessed portion 26 as in the first embodiment, the installation height of the tail pipe 8 and the exhaust pipe 31 is increased. The tail pipe 8 and the exhaust pipe 31 can be appropriately routed along the lower surface of the recessed portion 26 and can be connected to the silencer 7 while effectively preventing an excessively low height, etc., and the aerodynamic characteristics of the vehicle There is an advantage that damage can be prevented.

  In the first embodiment, since the box-shaped storage portion 27 serving as a sub-trunk portion that can communicate with the rear cargo compartment 3 is disposed in the concave portion 26, the rear cargo compartment 3 and the concave portion are arranged. 26 can be efficiently used as a luggage storage portion, and the tail pipe 8 and the exhaust pipe 31 can be appropriately routed in the lower portion of the sub trunk portion.

  In the first embodiment, an exhaust having an upstream pipe 29 installed so as to extend in the front-rear direction of the vehicle along the floor tunnel portion 9 and a pair of left and right downstream pipes 30 connected to the rear end portion. Although the example in which the left and right silencers 7 are arranged in parallel to the engine at the front of the vehicle body by the pipe 31 has been described, a structure in which the left and right silencers 7 are arranged in series with the engine may be employed. For example, as in the second embodiment of the present invention shown in FIG. 7, the upstream pipe 29 installed along the floor tunnel portion 9 is bent at a substantially right angle from the downstream portion to the outer side in the vehicle width direction. The downstream end of the exhaust pipe 31 is constituted by a bent portion 34 connected to one of the silencers 7a, the rear of the lower side of the inner side of the silencer 7a, and the front of the lower side of the inner side of the other silencer 7b. And connecting the upstream end of the tail pipe 8 to the inner side of the silencer 7b in the vehicle width direction and the rear of the lower side of the silencer 7b. The left and right silencers 7a and 7b may be arranged in series.

  Also in the exhaust system arrangement structure for a vehicle according to the second embodiment, the silencer 7 is provided by arranging the recessed portion 26 formed on the rear floor panel 4 and the silencer 7 side by side in the vehicle width direction. The connecting pipe 35 and the tail pipe 8 are disposed so as to extend in the vehicle width direction through the lower portion of the recessed portion 26 and obtain an excellent exhaust noise reduction function by sufficiently securing the capacity of the exhaust gas. As a result, the overall length can be made sufficiently large, so that the exhaust noise reduction function of the silencer 7 can be effectively improved. In addition, when the downstream side portion 33 of the tail pipe 8 is installed so as to extend from the vicinity of the center in the vehicle width direction to the rear side of the vehicle body, when a rear collision accident occurs in which a vehicle collides with the rear side of the vehicle body. There is an advantage that damage to the tail pipe can be effectively prevented.

3 Rear luggage compartment 4 Rear floor panel 5 Rear wheel 6 Suspension 7 Silencer 8 Tail pipe 15 Wheel house 26 Recessed part 31 Exhaust pipe 27 Box-shaped storage part (sub trunk part)

Claims (7)

  A silencer for reducing engine exhaust noise and a tail pipe connected to the silencer are arranged behind a rear wheel suspension disposed below a rear floor panel that forms a cargo floor at the rear of the vehicle body. An exhaust system arrangement structure for a vehicle is provided, and a rear floor panel is provided with a recessed portion that is recessed on the lower side in parallel with the silencer, and the tail pipe is disposed on the recessed portion. An exhaust system arrangement structure for a vehicle, characterized in that the exhaust system is installed so as to extend downward and to the rear side of the vehicle.   2. The exhaust system arrangement structure for a vehicle according to claim 1, wherein the tail pipe is installed so as to extend from the center in the vehicle width direction to the rear side of the vehicle body.   Below the rear floor panel, there is provided an exhaust pipe for connecting the engine disposed at the front of the vehicle and the silencer, and at least a part of the exhaust pipe passes below the recessed portion. The exhaust system arrangement structure for a vehicle according to claim 1 or 2, wherein the vehicle exhaust system arrangement structure is provided.   The exhaust system arrangement structure for a vehicle according to any one of claims 1 to 3, wherein the silencer is arranged on each of the left and right sides of the recessed portion in the vehicle width direction.   A drive system for transmitting the driving force of the engine to the rear wheels is disposed below the rear floor panel, and wheel houses for accommodating the rear wheels are formed on the left and right sides of the drive system in the vehicle width direction. 5. The apparatus according to claim 1, wherein the exhaust pipe is disposed behind the wheel house and is connected to the silencer so as to pass below a suspension and the drive system. 2. An exhaust system arrangement structure for a vehicle according to item 1.   The lower surface of the silencer is installed so as to protrude downward from the lower surface of the recessed portion, and the tail pipe and the exhaust pipe are respectively connected to the inner side surface in the vehicle width direction of the silencer. The exhaust system arrangement structure for a vehicle according to any one of claims 3 to 5.   The exhaust system arrangement structure for a vehicle according to any one of claims 1 to 6, wherein a sub trunk portion capable of communicating with a rear cargo compartment is provided in the recessed portion.

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