JP2006144693A - Engine exhaust device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the torsional vibration of an exhaust pipe 12 under a floor and to prevent the exhaust pipe 12 under the floor from bending upwards at the vehicle collision by reducing the exhaust resistance of the exhaust pipe 12 under the floor and simplifying the bending working. <P>SOLUTION: The exhaust pipe 12 under the floor is passed through the underside of a rear suspension cross member 14 in an offset to a vehicle side in a differential position, and the exhaust pipe 12 under the floor and a transverse silencer 15 are connected by a spherical movable pipe joint 25 in such an inclination that each rear side becomes high at the rear side of the cross member 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

    The present invention relates to an engine exhaust device.

    Regarding an engine exhaust device, a laterally mounted cylindrical silencer in which both ends of a cylindrical outer peripheral plate extending in the vehicle width direction are closed by an end plate is arranged at the rear part of the vehicle body (see Patent Document 1). . In Patent Document 1, a silencer is supported on a vehicle body by a rubber mount device, and a downstream end of an underfloor exhaust pipe extending rearward below the floor of the vehicle body is connected to an outer peripheral plate of the silencer. The upstream end of the tail pipe is connected to the end plate.

    In addition, an inlet pipe that penetrates the end of the cylindrical silencer in the silencer radial direction is provided, and an outlet pipe is protruded outward from the end plate of the silencer (see Patent Document 2).

    Further, regarding the horizontal silencer as described above, an exhaust pipe is connected to the outer peripheral plate at a position closer to the end plate side than the center in the vehicle width direction, and the outer peripheral surface of the exhaust pipe and the outer peripheral plate of the silencer are reinforced. The thing which built the member is also known (refer patent document 3).

It is also possible to prevent the cylindrical silencer from resonating with the roll vibration of the engine by connecting the exhaust pipe with a ball joint to a vertical cylindrical silencer arranged so as to extend in the longitudinal direction of the vehicle body. It is known (see Patent Document 4).
JP 2003-120282 A JP 09-303133 A Japanese Utility Model Publication No. 02-119924 Japanese Patent No. 3252735

    If the horizontal silencer is disposed between the side frames behind the rear suspension cross member, the silencer capacity can be increased, which is advantageous in reducing exhaust noise. However, in such an arrangement, the lower floor exhaust pipe needs to be passed through the upper or lower side of the cross member and further extended to the rear side. The drive system and suspension system members are arranged to form a narrow and complicated gap. Therefore, when the exhaust pipe under the floor is passed over the cross member, the exhaust pipe needs to be bent with a large curvature and relatively complicated.

    Further, when the exhaust pipe under the floor is extended rearward along the drive shaft so as to be housed in the floor tunnel portion of the vehicle body together with the drive shaft, the exhaust pipe is connected to a differential (abbreviation of differential gear) at the rear end of the drive shaft. have a finger in the pie. In order to avoid this, it is necessary to bend the exhaust pipe to the side of the vehicle body at the differential position. To connect the downstream end of the exhaust pipe to the central portion in the vehicle width direction of the horizontal silencer, It is necessary to bend the exhaust pipe bent sideways further toward the center of the vehicle body.

    Thus, when a complicated bending process is performed on the exhaust pipe, the cost increases due to an increase in the number of steps, and the exhaust resistance increases.

    On the other hand, if the exhaust pipe bent toward the vehicle body side at the differential position is extended rearward without bending toward the center of the vehicle body, that is, the rear part of the exhaust pipe is offset to the side of the vehicle body relative to the front part of the exhaust pipe (biased). If this is connected to the outer peripheral plate of the horizontal silencer, the problems of high cost and exhaust resistance are reduced. However, if the exhaust pipe is offset and connected to the silencer in this way, when the exhaust pipe swings up and down due to rough road traveling etc., the front side of the offset part and the rear side connected to the silencer are relatively displaced up and down. Torsional vibration is likely to occur. This torsional vibration not only adversely affects the durability of the exhaust pipe, but also adversely affects the durability of the horizontal silencer. That is, the outer peripheral plate of the silencer is usually less rigid than the end plate, and the torsional vibration is input from the exhaust pipe to the lower rigidity outer peripheral plate. Become.

    Also, when an obstacle such as another vehicle collides with the vehicle from behind, the exhaust pipe may be deformed. If the exhaust pipe is bent upward at that time, the fuel tank of the vehicle is destroyed or the suspension is suspended. There is a problem that the member is broken.

    That is, an object of the present invention is to reduce the above-described exhaust resistance, simplify exhaust pipe processing, solve the problem of torsional vibration when adopting the offset connection of the exhaust pipe, and further to the rear of the vehicle The purpose is to solve the above problem at the time of collision.

    In the present invention, to solve such a problem, an underfloor exhaust pipe is passed through the lower side of the rear suspension cross member to make an offset connection to a horizontal silencer, and a spherical movable pipe joint is adopted for the connection.

That is, according to the first aspect of the present invention, the rear-wheel drive drive shaft extends in the front-rear direction below the floor of the vehicle body, and the cylinder extending in the vehicle width direction across the left and right side frames of the vehicle body is behind the cross member of the rear suspension. A horizontal silencer having a cylindrical outer peripheral plate and end plates closing both ends of the outer peripheral plate is disposed, and the silencer is supported by a rubber mount device on the vehicle body and extends rearward below the floor. In the exhaust system of the engine in which the downstream end of the lower exhaust pipe is connected to the silencer so as to introduce exhaust from the portion of the outer peripheral plate, and the upstream end of the tail pipe is connected to the end plate of the silencer.
The lower floor exhaust pipe extends rearward along the drive shaft to the rear, further extends rearward through the lower side of the cross member, and the rear portion is offset to the vehicle body side.
On the outer peripheral plate of the silencer, an exhaust introduction pipe for introducing exhaust to the silencer is fixed to a portion offset to the side of the vehicle body so as to correspond to the downstream end of the exhaust pipe below the floor.
The downstream end of the lower floor exhaust pipe and the exhaust introduction pipe are connected to each other by spherical movable pipe joints that are in contact with each other in a spherical state with the rear side inclined at the rear of the cross member. It is characterized by being.

    As described above, according to the present invention, the exhaust pipe under the floor is passed through the lower side of the suspension cross member and connected to the exhaust introduction pipe of the horizontal silencer while being offset to the side of the vehicle body. The bent part of the exhaust pipe under the floor is reduced, which is advantageous in improving the engine output by reducing the exhaust resistance and reducing the cost by reducing the number of exhaust pipe processing steps.

    Then, the lower floor exhaust pipe is offset as described above and connected to the exhaust pipe of the silencer. However, a spherical movable pipe joint is adopted for the connection, and the lower floor exhaust pipe is connected to the exhaust inlet pipe. Since the displacement is made possible, the torsional vibration of the exhaust pipe due to rough road traveling or the like is suppressed, which is advantageous for improving the durability. At the same time, since the vibration input from the exhaust pipe under the floor to the silencer is suppressed by the spherical movable joint, it is advantageous for ensuring the durability of the silencer.

    In addition, the lower floor exhaust pipe is passed through the suspension cross member below, and the rear floor exhaust pipe and the exhaust introduction pipe are connected to each other by the spherical movable joint in the state where the rear side is inclined so that the rear side becomes higher. Therefore, it is advantageous in preventing the lower floor exhaust pipe from bending upward at the time of a rear collision of the vehicle. That is, when the lower floor exhaust pipe is bent upward and passed through the cross member, the curved portion of the lower floor exhaust pipe is pushed up by the collision load. When a slant is raised through the underside of the cross member, the horizontal silencer rotates relatively upward with the spherical center of the spherical movable fitting as a fulcrum, and the spherical movable fitting moves downward That is, the collision load is likely to work as a force for pushing down the exhaust pipe under the floor. This is advantageous in preventing the exhaust pipe under the floor from damaging the fuel tank, suspension, and other vehicle components in the event of a collision.

The invention according to claim 2 is the invention according to claim 1,
The lower floor exhaust pipe is cantilevered on the vehicle body by a rubber mount device disposed on the opposite side of the left and right sides of the drive shaft.

    That is, when the under-floor exhaust pipe is cantilevered as described above, the under-floor exhaust pipe becomes a mass body and tends to vibrate up and down, whereby the torsional vibration described above tends to increase. In contrast, in the case of the present invention, since the restraint of the exhaust pipe under the floor by the silencer is weakened by the spherical movable joint as described above, the torsional vibration can be efficiently suppressed even with the cantilever support. This is advantageous for ensuring the durability of the exhaust pipe and the silencer.

The invention according to claim 3 is the invention according to claim 1 or claim 2,
The exhaust introduction pipe is characterized in that it extends obliquely downward toward the downstream end of the lower floor exhaust pipe from a position biased to the lower half circumference side from the vertical center position of the silencer outer peripheral plate.

    Therefore, when a collision load is applied to the silencer from the rear, the silencer is likely to move relatively upward with the spherical movable fitting as a fulcrum, that is, the movable fitting is likely to move downward. This is advantageous in preventing the lower floor exhaust pipe from bending upward.

According to a fourth aspect of the present invention, in any one of the first to third aspects,
The silencer is supported on the vehicle body by a rubber mount device arranged in front and back of the silencer, and the rear rubber mount device is provided at a higher position than the front rubber mount device.

    That is, when a collision load is applied to the silencer from the rear, the front rubber mount device supports the load and the silencer tries to rotate, and the rear rubber mount device regulates the rotation direction. Since the rubber mount device is at a high position, the silencer is easy to rotate so that the rear side is relatively higher than the front side. Therefore, the spherical movable pipe joint becomes easy to move downward, which is advantageous in preventing the lower floor exhaust pipe from bending upward.

The invention according to claim 5 is any one of claims 1 to 4,
The tail pipe has a downstream end extending rearward, and the downstream end is provided at a higher position than an upstream end of the tail pipe fixed to the end plate of the silencer.

    Therefore, when a collision load from the rear is applied to the tail pipe, a force is exerted on the tail pipe so that the downstream end moves upward with the upstream end as a fulcrum. The silencer is also easy to rotate so that the rear side is relatively higher than the front side with the spherical movable fitting as a fulcrum. Therefore, the spherical movable pipe joint becomes easy to move downward, which is advantageous in preventing the lower floor exhaust pipe from bending upward.

The invention according to claim 6 is any one of claims 1 to 5,
The downstream end of the tail pipe faces the rear of the vehicle body from the notch formed in the rear bumper of the vehicle body,
The rubber mount device for the silencer includes a mount rubber which is fixed to each of the silencer and the vehicle body and passed to both rods extending in the vehicle width direction, and is disposed on both sides of the mount rubber in the vehicle width direction. A lateral deformation restricting plate for restricting deformation in the vehicle width direction is provided.

    That is, since the spherical movable pipe joint allows the under-floor exhaust pipe to be displaced with respect to the silencer as described above, the silencer itself does not need to roll with respect to the vehicle body. Therefore, in the present invention, the silencer is positively restricted from being caused by rolling vibration of the vehicle, and the tail pipe fixed to the silencer is prevented from shaking in the lateral direction. Therefore, it is possible to avoid the tail pipe from interfering with the notch of the rear bumper due to the vibration of the vehicle, so that the gap in the vehicle width direction between the tail pipe and the notch of the rear bumper can be narrowed to improve the appearance. Become advantageous.

    As described above, according to the present invention, the underfloor exhaust pipe extending along the drive shaft is passed through the lower side of the rear suspension cross member, and the underfloor exhaust pipe and the exhaust introduction pipe of the horizontal silencer are connected to the vehicle body side. Because it is connected by the spherical movable pipe joint in the state that it is offset to the side and tilted so that the rear side becomes higher, the bent part of the exhaust pipe under the floor is reduced and the exhaust resistance is reduced. And torsional vibration of the exhaust pipe under the floor due to the above-mentioned offset, while improving the durability of the exhaust pipe under the floor and the silencer, and further, the rear collision of the vehicle Sometimes preventing the lower floor exhaust pipe from bending upwards, that is, preventing damage to the fuel tank, suspension, and other vehicle components. It becomes profit.

    Further, the front and rear rubber mounts that extend the exhaust introduction pipe obliquely downward toward the spherical movable fitting from a position deviated from the center position in the vertical direction of the silencer outer peripheral plate toward the spherical movable fitting, or support the silencer on the vehicle body Of the devices, the rear rubber mount device is positioned higher than the front rubber mount device, or the downstream end extending rearward of the tail pipe is positioned higher than the upstream end fixed to the end plate of the silencer. If provided, at the time of the collision, it is advantageous for moving the spherical movable joint downward to prevent the lower floor exhaust pipe from bending upward.

    Further, if the rubber mounting device of the silencer is provided with a lateral deformation restricting plate that restricts deformation of the mounting rubber in the vehicle width direction, the tail pipe fixed to the silencer is prevented from rolling and the tail pipe is prevented. The gap in the vehicle width direction between the rear bumper and the notch of the rear bumper can be narrowed, which is advantageous for improving the appearance.

    Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

    As shown in FIGS. 1 and 2, the present embodiment is an embodiment in which the present invention is applied to an exhaust device of a front engine 1 of a four-wheel drive vehicle. As shown in FIG. 1, a drive shaft 4 extends rearward from the front differential 3 for the front wheel 2 through the center in the vehicle width direction, and a rear differential 6 for the rear wheel 5 is coupled to the rear end. The exhaust system of the engine 1 includes a direct-coupled catalytic converter 11 connected to the exhaust manifold of the engine 1, an underfloor exhaust pipe 12 extending rearward under the vehicle body floor, and a main silencer 15 disposed behind a cross member 14 of the rear suspension 13. The tail pipe 16 is arranged and connected in order from the upstream side. An underfloor catalytic converter 17 and a sub silencer 18 are provided in the middle of the underfloor exhaust pipe 12. The cross member 14 is passed to the left and right side frames 32, 32.

    As shown in FIG. 2, the drive shaft 4 is disposed in a floor tunnel 22 formed at the center of the front floor panel 21 in the vehicle width direction. The lower floor exhaust pipe 12 extends rearward along the drive shaft 4 in the floor tunnel 22, further extends rearward through the fuel tank 23 and the lower side of the cross member 14, and has a downstream end at the main silencer. 15 exhaust introduction pipes 24 are connected by a spherical movable joint 25 described later. The fuel tank 23 is disposed in front of the cross member 14 below the rear floor panel 26, and the lower surface of the center portion in the vehicle width direction is recessed upward to allow the drive shaft 4 and the floor lower exhaust pipe 12 to pass therethrough.

    The lower floor exhaust pipe 12 extending rearward along the drive shaft 4 is offset to the side of the vehicle body so that its rear portion does not interfere with the rear differential 6, and in this offset state, the rear differential 6 , The rear suspension stabilizer 28, the rear axle 29, and the lower side of the cross member 14, extending toward the main silencer 15.

    The lower floor exhaust pipe 12 is cantilevered on the front floor panel 21 by a rubber mount device 31 disposed on the opposite side of the left and right sides of the drive shaft 4. The rubber mount device 31 is formed by elastically connecting a rod extending from the underfloor exhaust pipe 12 and a rod fixed to the floor panel 21 up and down by a mount rubber. It is provided at four locations, both ends, the position of the sub silencer 18, and an intermediate position between the catalytic converter 17 and the sub silencer 18.

    The main silencer 15 has a shell formed by a cylindrical outer peripheral plate 33 extending in the vehicle width direction over the left and right side frames 32, 32 at the rear of the vehicle body, and an end plate 34 shown in FIG. 3 that closes both ends of the outer peripheral plate 33. This is a cylindrical horizontal silencer, and a partition plate for silencing is provided in the shell.

    FIG. 3 shows a connection state between the downstream end of the lower floor exhaust pipe 12 and the exhaust introduction pipe 24 of the main silencer 15 by the spherical movable pipe joint 25. The spherical movable pipe joint 25 is disposed so as to be displaced downward when the main silencer 15 moves forward relative to the lower floor exhaust pipe 12.

    More specifically, the under-floor exhaust pipe 12 extends rearward with an inclination so that the rear side is higher than the bottom of the rear suspension cross member 14. On the other hand, the exhaust introduction pipe 24 for introducing the exhaust to the main silencer 15 is located on the side of the outer peripheral plate 33 on the side of the vehicle body so as to correspond to the offset downstream end of the lower floor exhaust pipe 12 as shown in FIGS. It is arranged at the offset part. The exhaust introduction pipe 24 is inclined toward the downstream end of the lower floor exhaust pipe 12 from a position biased to the lower half circumference side with respect to the vertical center position of the outer peripheral plate 33 and in the same manner as the lower floor exhaust pipe 12. And extended.

    As shown in FIG. 4, the spherical movable pipe joint 25 includes a convex spherical surface of the seal body 37 fixed to the outer peripheral surface of the downstream end of the exhaust pipe 12 below the floor and a flange 38 fixed to the upstream end of the exhaust introduction pipe 24. The concave spherical seal seat 38a is elastically pressed. For this elastic pressing, the flange 39 at the downstream end of the lower floor exhaust pipe 12 and the flange 38 of the exhaust introduction pipe 24 are elastically connected by a bolt 41 and a coil spring 42.

    Further, as shown in FIG. 2, the main silencer 15 is supported on the vehicle body by rubber mount devices 45 provided at four positions on the front, rear, left and right sides thereof. That is, the main silencer 15 is supported by the rear suspension cross member 14 by the rubber mounting devices 45 disposed on the left and right sides of the front side, and the left and right side frames 32, 32. The front and rear rubber mount devices 45 are arranged at a higher position on the rear side than on the front side.

    As shown in FIG. 3, the rubber mount device 45 includes a silencer side rod 47 that is fixed to the end plate 34 and extends in the vehicle width direction, and is fixed to the rear suspension cross member 14 or the side frame 32 and is located above the silencer side rod 47. Is provided with a mount rubber 49 for connecting a vehicle body side rod 48 extending in the vehicle width direction and a lateral deformation restricting plate 50. The vehicle body side rod 48 of the front rubber mount device 45 is fixed to the rear suspension cross member 14, and the vehicle body side rod 48 of the rear rubber mount device 45 is fixed to the side frame 32. The rear rod 48 is disposed at a higher position than the front rod 48.

    A specific configuration of the rubber mount device 45 is shown in FIGS. The mount rubber 49 is in the shape of a vertically long oval thick plate having a through-hole in the center, and a hole 51 for passing the rod 48 and a hole 52 for passing the rod 47 are formed at the upper and lower portions thereof. A stopper for restricting the upward movement of the lower rod 47 is formed on the upper and lower opposing surfaces of the through hole. A hollow upper plate 53 is fixed to the upper surface of the mount rubber 49, and a hollow that regulates deformation of the mount rubber 49 in the vehicle width direction on both sides in the vehicle width direction above the mount rubber 49 from the upper plate 53. The lateral deformation restricting plates 50, 50 are extended. The lateral deformation restriction plate 50 is formed with a through hole through which the upper rod 48 passes. Both front and rear sides of the mount rubber 49 are released so as to allow the front and rear deformation of the mount rubber 49, and the lower surface side of the mount rubber 49 is also released so as to allow the lower deformation of the mount rubber 49. ing.

    As shown in FIGS. 1 and 2, the tail pipe 16 is provided on both the left and right sides of the main silencer 15, and the upstream ends are respectively lower than the center position in the vertical direction of the end plate 34 as shown in FIG. The downstream end, which is fixed to the side and protrudes to the side, is curved and faces rearward, protrudes rearward from the main silencer 15. The tail pipe 16 is curved so that its downstream end is higher than its upstream end. Further, the downstream end of the tail pipe 16 faces the rear of the vehicle body from a notch 44 formed in the rear bumper 43. The notch 44 opens downward as shown in FIG.

    Therefore, according to the exhaust system for an engine as described above, the lower floor exhaust pipe 12 passes through the lower side of the rear suspension cross member 14, so that it is not necessary to be curved up and down in a large and complicated manner. In addition, the lower floor exhaust pipe 12 extends rearward while being offset to the side of the vehicle body at the position of the rear differential 6 and is connected to the exhaust introduction pipe 24 of the main silencer 15, so that the offset portion 12a at the differential position is Others have no big left and right bends As described above, since the bent portion of the exhaust pipe 12 below the floor is reduced, it is advantageous in improving the engine output by reducing the exhaust resistance and reducing the cost by reducing the number of exhaust pipe processing steps.

    The lower floor exhaust pipe 12 is formed with an offset portion 12a at the rear differential position. A spherical movable pipe joint 25 is employed for connection between the lower floor exhaust pipe 12 and the exhaust introduction pipe 24 of the main silencer 15. Since the underfloor exhaust pipe 12 can be displaced with respect to the exhaust introduction pipe 24, the torsional vibration associated with the offset is suppressed even if the underfloor exhaust pipe 12 swings up and down due to traveling on a rough road or the like. In particular, since the lower floor exhaust pipe 12 is cantilevered on the vehicle body by a rubber mount device 31 disposed on one side thereof, it tends to swing up and down, but the torsional vibration is efficiently generated by the spherical movable pipe joint 25. It can be suppressed. Therefore, the durability of the underfloor exhaust pipe 12 is improved, and the input of vibration from the underfloor exhaust pipe 12 to the main silencer 15 is suppressed by the spherical movable fitting 25, so that the durability of the main silencer 15 is also improved. To do.

    Further, as described above, the transmission of vibration from the lower floor exhaust pipe 12 to the main silencer 15 is suppressed by the spherical movable pipe joint 25. This means that the main silencer 15 itself needs to vibrate in accordance with the lower floor exhaust pipe 12. That is not. Therefore, in this embodiment, the rubber mount device 45 of the main silencer 15 is provided with a lateral deformation restricting plate 50 to positively restrict the main silencer 15 from rolling due to running vibration and fixed to the main silencer 15. The tail pipe 16 is prevented from rolling. Therefore, since the tail pipe 16 is prevented from interfering with the notch 44 of the rear bumper 43 due to running vibration, the gap in the vehicle width direction between the tail pipe 16 and the notch 44 of the rear bumper 43 can be narrowed. It becomes advantageous for improvement.

    Further, when a collision load is applied to the vehicle from the rear, the load is transmitted from the tail pipe 16 to the lower floor exhaust pipe 12 via the main silencer 15. On the other hand, since the lower floor exhaust pipe 12 and the exhaust introduction pipe 24 of the main silencer 15 are connected by the spherical movable joint 25 in a state where the rear side is inclined so as to be higher, As a force for rotating the silencer 15 relatively upward around the spherical center of the spherical movable pipe joint 25, as viewed from the movable pipe joint 25 side, a force for pushing down the movable pipe joint 25 together with the lower floor exhaust pipe 12 It becomes easy to work.

    In particular, in the case of the above-described embodiment, the exhaust silencer 15 extends obliquely downward toward the front from a position biased to the lower half circumference side of the center position of the main silencer 15 in the vertical direction. It becomes easy to rotate and move to the upper side of the spherical movable joint 25 by the load. Further, since the rear rubber mount device 45 of the main silencer 15 is higher than the front rubber mount device 45, the main silencer 15 is easily rotated upward with the front rubber mount device 45 as a fulcrum by the collision load. ing. Furthermore, since the downstream end of the tail pipe 16 is higher than the upstream end, the downstream end side easily moves upward with the upstream end as a fulcrum by the collision load. Thus, such movement of the main silencer 15 and the tail pipe 16 acts as a force for pushing down the spherical movable pipe joint 25 together with the lower floor exhaust pipe 12.

    Therefore, at the time of a rear collision, the rear portion of the lower floor exhaust pipe 12 is reliably bent downward, and the lower floor exhaust pipe 12 is prevented from damaging other vehicle body components such as the fuel tank 23, the rear suspension 13, and the rear differential 6.

    In addition, although the vehicle of the said embodiment is a four-wheel drive, this invention is applicable also to FR vehicle which does not drive a front wheel.

1 is a bottom view showing a drive system, a suspension, and an exhaust system of a vehicle according to the present invention. It is the bottom view which abbreviate | omitted some vehicles for showing the exhaust apparatus which concerns on this invention. It is a side view which shows the component of the exhaust part rear part. It is sectional drawing which shows the spherical type movable pipe joint of the same exhaust apparatus. It is a side view of the rubber mount device of a horizontal type silencer. It is a front view of the rubber mount device. It is a top view of the rubber mount device. FIG. 2 is a rear view showing a part of the vehicle (relation between a rear bumper cutout and a tail pipe).

Explanation of symbols

1 Engine 4 Drive shaft 6 Rear differential 12 Exhaust pipe under the floor 14 Rear suspension cross member 15 Main silencer (transverse silencer)
16 Tail Pipe 22 Floor Tunnel 23 Fuel Tank 24 Exhaust Inlet Pipe 25 Spherical Movable Pipe Joint 31 Rubber Mount Device 32 Side Frame 33 Silencer Outer Plate 34 End Plate 43 Rear Bumper 44 Notch 45 Rubber Mount Device 50 Lateral Deformation Restriction Plate

Claims (6)

A rear-wheel drive drive shaft extends in the front-rear direction under the floor of the vehicle body, and behind the cross member of the rear suspension is a cylindrical outer peripheral plate extending in the vehicle width direction across the left and right side frames of the vehicle body, A horizontal silencer having an end plate that closes both ends is arranged, the silencer is supported by a rubber mount device on the vehicle body, and the downstream end of the lower floor exhaust pipe extending rearward below the floor is connected to the silencer. On the other hand, in the exhaust system of the engine connected to introduce exhaust from the portion of the outer peripheral plate, and the upstream end of the tail pipe is connected to the end plate of the silencer,
The lower floor exhaust pipe extends rearward along the drive shaft, further extends rearward through the lower side of the cross member, and the rear part is offset toward the vehicle body side.
On the outer peripheral plate of the silencer, an exhaust introduction pipe for introducing exhaust to the silencer is fixed to a portion offset to the side of the vehicle body so as to correspond to the downstream end of the exhaust pipe below the floor.
The downstream end of the lower floor exhaust pipe and the exhaust introduction pipe are connected to each other by spherical movable pipe joints that are in contact with each other in a spherical state with the rear side inclined at the rear of the cross member. An exhaust system for an engine. In claim 1,
An exhaust system for an engine, wherein the lower floor exhaust pipe is cantilevered on a vehicle body by a rubber mount device disposed on the opposite side of the left and right sides of the drive shaft. In claim 1 or claim 2,
The exhaust introduction pipe extends obliquely downward toward a downstream end of the lower floor exhaust pipe from a position biased to a lower half circumference side from a vertical center position of the silencer outer peripheral plate. Exhaust system. In any one of Claim 1 thru | or 3,
The silencer is supported by the vehicle body by a rubber mount device arranged at the front and rear of the silencer, and the rear rubber mount device is provided at a higher position than the front rubber mount device. Exhaust system. In any one of Claims 1 thru | or 4,
The tail pipe has a downstream end extending rearward, and the downstream end is provided at a higher position than an upstream end of the tail pipe fixed to the end plate of the silencer. Exhaust system. In any one of Claims 1 thru | or 5,
The downstream end of the tail pipe faces the rear of the vehicle body from the notch formed in the rear bumper of the vehicle body,
The rubber mount device for the silencer includes a mount rubber which is fixed to each of the silencer and the vehicle body and passed to both rods extending in the vehicle width direction, and is disposed on both sides of the mount rubber in the vehicle width direction. An engine exhaust apparatus comprising a lateral deformation restricting plate for restricting deformation in the vehicle width direction.

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