JP2003120282A - Exhaust system structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust system, which has a long silencer in a width direction of a body, and has such a structure for allowing not only vibrations in front and rear directions of the body but also vibrations in the width direction of the body. SOLUTION: A pair of first right and left support mechanisms 9, 9 and a pair of second right and left support mechanisms 10, 10 for supporting a silencer 3 which is long in the width direction of a vehicle body to the body are arranged on a front side and a rear side of both ends 3a of the silencer 3 in the width direction of the vehicle body. The first support mechanism 9 allows an exhaust pipe 4 and the silencer 3 to move in the front and rear directions of the body, and the second support mechanism 10 allows the exhaust pipe 4 and the silencer 3 to move in a width direction of the body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of an exhaust system structure in which a silencer whose longitudinal direction is the vehicle width direction is attached to the exhaust system.

[0002]

2. Description of the Related Art Generally, a vehicle exhaust system is provided with a silencer for attenuating exhaust noise when exhausting combustion gas generated in an engine. The silencer is connected to the engine via an exhaust pipe and is attached to the vehicle body via a bracket or the like. In that case, the silencer mounting structure is divided into a structure in which the longitudinal direction of the vehicle and the longitudinal direction of the silencer are matched, and a structure in which the vehicle width direction and the longitudinal direction of the silencer are matched. Which structure to use is determined in consideration of the layout and the like.

For example, as the latter mounting structure, an actual flat plate
In JP-A 2-61115, rod-shaped silencer-side hanging brackets extending outward in the vehicle width direction are provided at four corners in the front, rear, left, and right of a silencer whose longitudinal direction is the vehicle width direction, and these silencer-side hanging brackets are also provided. Corresponding to the above, four rod-shaped vehicle-body-side hanging brackets extending in parallel to the silencer-side hanging brackets are provided in the lower part of the vehicle body, and these both brackets are connected via a hanger rubber. A technique is disclosed in which the thermal expansion in the vehicle front-rear direction of an exhaust pipe extending in the vehicle front-rear direction and connected to a silencer and the vibration when the silencer and the exhaust pipe vibrate in the front-rear direction are permitted and absorbed.

[0004]

However, in the mounting structure described in the above publication, for example, when the silencer vibrates in the front-rear direction of the vehicle body due to starting or braking, the vibration in the front-rear direction of the vehicle body is allowed. Although the vibration is allowed and absorbed by the means, when the silencer vibrates in the width direction of the vehicle body due to cornering or the like, there is no means for allowing the vibration in the width direction. Is transmitted to the vehicle body, the ride feeling is deteriorated, and stress acts on the connection portion between the vehicle body and the vehicle body side suspension bracket and the connection portion between the silencer and the silencer side suspension bracket, and these There is a risk that the connecting portion may be fatigued and damaged.

Therefore, it is an object of the present invention to provide a structure of an exhaust system having a silencer long in the width direction of the vehicle body, which allows not only vibration in the longitudinal direction of the vehicle body but also vibration in the vehicle body width direction. .

[0006]

That is, the invention according to claim 1 of the present application is an exhaust system structure in which a silencer long in the vehicle width direction is attached to a downstream end portion of an exhaust pipe, wherein the silencer is a vehicle body. It is supported by the vehicle body through a pair of left and right supporting means arranged on the front side and the rear side of both ends in the width direction, and either one of the supporting means moves the exhaust pipe and the silencer in the vehicle longitudinal direction. The other support means allows the exhaust pipe and the silencer to move in the vehicle body width direction.

According to the present invention, the movement of the exhaust pipe and the silencer in the longitudinal direction of the vehicle body is permitted by the support means for permitting the movement in the longitudinal direction of the vehicle body, and the movement in the vehicle body width direction is permitted to move the vehicle body width direction. Since it is allowed by the support means, movement in the vehicle body width direction, the vehicle body front-rear direction, and a direction in which these are combined is allowed.

Therefore, even if the exhaust pipe and the silencer vibrate in any of the front-rear direction of the vehicle body, the vehicle body width direction, or a combination thereof due to, for example, braking or cornering, the vibration is 2 The ride feeling is not deteriorated because the two support means allow and absorb the absorption means and do not transmit it to the vehicle body.

Further, since the vibration is absorbed, no stress is generated at the connecting portion between the vehicle body and the silencer, so that the connecting portion is not fatigued and damaged.

Even when the exhaust pipe thermally expands, the expansion is allowed and absorbed by the support means that allows the vehicle to move in the front-rear direction. No stress is generated in the connecting portions between the vehicle body and the silencer, and these connecting portions are not fatigued and damaged.

Next, the invention described in claim 2 is the same as claim 1.
In the invention described in (1), the exhaust pipe is characterized in that the upstream exhaust pipe connected to the engine and the downstream exhaust pipe attached to the silencer are connected by a flexible joint.

According to the present invention, since the upstream side exhaust pipe and the downstream side exhaust pipe are connected by the flexible joint, for example, engine vibration generated in the upstream side exhaust pipe is not transmitted to the downstream side exhaust pipe. On the other hand, the vibration of the silencer in the vehicle body width direction generated in the downstream side exhaust pipe is not transmitted.

According to a third aspect of the present invention, in the first or second aspect of the invention, the supporting means for allowing movement in the vehicle front-rear direction is arranged on the front side of both ends of the silencer, The supporting means for allowing movement in the width direction is arranged at the rear side of both ends of the silencer.

According to the present invention, when the silencer and the exhaust pipe vibrate in the vehicle width direction due to, for example, cornering of the vehicle, the vibration is in a horizontal plane centered substantially at the center in the longitudinal direction of the vehicle. , Its amplitude becomes farther from the center, that is, becomes larger on the rear side than on the front side of the silencer, but the second support means that allows movement in the vehicle width direction supports the rear side of both ends of the silencer. Therefore, the vibration can be more effectively permitted and absorbed.

Next, the invention according to claim 4 relates to claim 1.
In the invention according to any one of claims 3 to 3, the support means for allowing movement in the vehicle body front-rear direction is attached to the vehicle body side and extends in the vehicle body width direction, and the first fixed shaft is attached to the silencer side. A support means having a first moving shaft extending in parallel to the fixed shaft and a first elastic body penetrating both of these shafts and allowing movement in the vehicle width direction is attached to the vehicle body side in the vehicle longitudinal direction. It has a second fixed shaft extending, a second moving shaft attached to the silencer side and extending parallel to the second fixed shaft, and a second elastic body penetrating both of these shafts. The moving shaft is integrated in an L shape.

According to the present invention, when the silencer is vibrated in the vehicle front-rear direction, for example, the first elastic body of the support means for permitting movement in the vehicle front-rear direction is centered on the first fixed shaft. While swinging in the front-rear direction, the second fixed shaft of the support means that allows movement in the vehicle body width direction extends in the vehicle body front-rear direction, so that the second elastic body does not swing so greatly in the vehicle body front-rear direction. . On the other hand, when vibration occurs in the vehicle body width direction, the second elastic body of the support means that allows movement in the vehicle body width direction swings in the vehicle body width direction about the second fixed shaft, while in the vehicle body longitudinal direction. Since the first fixed shaft of the supporting means that allows the movement of the first elastic body extends in the vehicle body width direction, the first elastic body does not swing so much in the vehicle body width direction.

In this case, the first elastic body and the second elastic body are connected by the first and second moving shafts penetrating the respective lower portions and integrated in an L-shape, so that the front-rear direction of the vehicle body. When both of the vibration of the first elastic body and the vibration of the vehicle body width direction occur, they try to regulate the rocking, but the first elastic body and the second elastic body are deformed by the elasticity to allow the vibration.

That is, these two pairs of supporting means do not completely allow or completely restrict vibrations, but allow them within a range in which the first and second elastic bodies can elastically deform. However, as a result, even if vibration in the vehicle front-rear direction or vibration in the vehicle width direction occurs, the vibration is quickly converged without increasing its amplitude.

Further, since the above-mentioned vibration is allowed and absorbed by the swinging and deformation of the first and second elastic bodies, no stress is generated at the connecting portion between the silencer and the vehicle body, and the connecting portion is fatigued and damaged. There is nothing to do.

According to a fifth aspect of the invention, in the invention according to the fourth aspect, the tail pipes extend in the vehicle body width direction from both ends of the silencer, and the support bracket for supporting the tail pipes on the silencer is a silencer. It is characterized in that the first and second moving shafts, which are connected to each other at both ends thereof above the tail pipe and are integrated in an L shape, are supported by the support bracket.

According to the present invention, since the rigid body structure is formed by the combination of the support bracket having the connection points with the other two, the both ends of the silencer, and the tail pipe,
The rigidity around these connected parts and the supporting rigidity of the tail pipe to the silencer are improved. Moreover, since the first and second moving shafts integrated in the L-shape are supported by the support bracket, the first and second moving shafts integrated in the L-shape are provided.
The support rigidity of the second moving shaft is also improved.

Further, for example, when the tail pipe is connected only to the end portion of the silencer, when the silencer vibrates, the tail pipe vibrates around the connecting portion as a fulcrum and a stress is generated in the connecting portion. However, in the present invention, this does not occur because each has a connection point with the other two. Similarly, there is no risk of fatigue and damage to the connection, as is the case, for example, when the bracket supporting the silencer is connected only to the ends of the silencer. That is, according to the present invention, even if the silencer vibrates, the vibration is not concentrated on the specific connection portion but is dispersed, so that the connection portion is not fatigued and damaged by stress.

The invention according to claim 6 is the same as claim 5
In the invention described in, the tail pipe extends to the height of the connection point between the silencer and the support bracket, the connection point between the tail pipe and the support bracket, in the height direction,
It is characterized in that it is located approximately in the middle of the connection point between the silencer and the support bracket and the connection point between the silencer and the tail pipe.

According to the present invention, the connecting point between the tail pipe and the support bracket, the connecting point between the silencer and the support bracket, and the connecting point between the silencer and the tail pipe form a substantially isosceles triangular rigid body structure. As a result, the rigidity in the vicinity of the connection point is further enhanced, and the effect of claim 5 is further promoted.

The invention according to claim 7 is characterized in that, in the invention according to claim 5 or 6, the end portion of the tail pipe extends rearward of the vehicle body and penetrates the rear bumper. To do.

By the way, if the tail pipe is penetrated through the bumper, the tail pipe may come into contact with the bumper when vibrating. However, even if the vibration is allowed and absorbed by one of the two supporting means, the other As a result, the vibration is suppressed, so that it is possible to prevent the end portion of the tail pipe from contacting and causing heat loss or damage.

Further, in the invention described in claim 8, in the invention described in any one of claims 4 to 7, the supporting means for allowing movement in the vehicle width direction is a pair of left and right second fixed shafts. The gap is different from the gap between the pair of left and right second moving shafts.

When the distance between the pair of left and right second fixed shafts and the distance between the pair of left and right second moving shafts are the same, a parallelogram link is formed, and the silencer moves in the vehicle width direction, for example, the silencer. Vibration in the width direction is not suppressed.
Therefore, the distance between the pair of left and right second fixed shafts and the distance between the pair of left and right second moving shafts are made different to suppress vibration.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Exhaust system structures according to the embodiments of the present invention will be described below.

As shown in FIGS. 1 and 2, this exhaust system 1
Is an upstream exhaust pipe 2 connected to the engine side (not shown),
It has a downstream side exhaust pipe 4 connected to a silencer 3 long in the vehicle body width direction, and a flexible joint 5 connecting the upstream side exhaust pipe 2 and the downstream side exhaust pipe 4 so as to be vertically swingable. The discharged exhaust gas includes a catalytic converter (not shown), a pre-silencer, an upstream exhaust pipe 2, a flexible joint 5, a downstream exhaust pipe 4, a silencer 3,
The silencer 3 is configured to be discharged into the atmosphere through tail pipes 6 and 6 attached to both side surfaces 3a and 3a of the silencer 3.

The exhaust system 1 includes an upstream side support mechanism 7 provided near the flexible joint 5 of the upstream side exhaust pipe 2 and a downstream side provided near the intermediate position in the longitudinal direction of the downstream side exhaust pipe 4. A support mechanism 8 and first support mechanisms 9, 9 provided on the front side near both ends in the longitudinal direction of the silencer 3,
It is supported by the vehicle body or the like by the second support mechanism 10, 10 provided on the rear side.

Of these, the upstream side support mechanism 7 is shown in FIG.
As shown in FIG. 4, a fixed shaft 11 extending from the body frame F1 in the vehicle width direction, a hanger rubber 12 swingably supported by the fixed shaft 11, and a lower part of the hanger rubber 12 are passed through the upstream exhaust pipe. Moving shaft 13 extending toward 2
And a bracket 14 having a central portion fixed to the moving shaft 13 and an end portion fixed to the upstream exhaust pipe 2,
When the upstream side exhaust pipe 2 moves in the front-rear direction of the vehicle body due to thermal expansion, vibration, etc., the hanger rubber 12 swings in the front-rear direction about the fixed shaft 11, thereby allowing and absorbing the movement, and It is configured so that vibrations and the like are not transmitted to the vehicle body side.

The downstream side support mechanism 8 is, as shown in FIG.
The structure is similar to that of the upstream side support mechanism 7, and is fixed to a fixed shaft 21 that extends in the vehicle width direction by being screwed into a boss Da provided in a case D of the differential gear device, and is swingably supported by the fixed shaft 21. A hanger rubber 22, a moving shaft 23 that penetrates a lower part of the hanger rubber 22 and extends toward the downstream exhaust pipe 4, a central portion is fixed to the moving shaft 23, and an end of the hanger rubber 22 is attached to the downstream exhaust pipe 4. The hanger rubber 22 swings in the front-rear direction around the fixed shaft 21 when the downstream side exhaust pipe 4 moves in the front-rear direction of the vehicle body due to thermal expansion or vibration. Thus, the movement is allowed and absorbed, and the vibration or the like is not transmitted to the differential device side.

Next, the structure around the silencer 3 will be described. As shown in FIGS. 1, 2 and 5, the silencer 3 is long in the vehicle body width direction and has both end portions 3a, 3a.
Is an elliptical bottomed tubular body, and the downstream side exhaust pipe 4 is provided at the center in the width direction.
And tail pipes 6 and 6 having circular cross sections are connected to the lower portions of both ends 3a and 3a. The tail pipes 6, 6 extend obliquely upward and outward in the vehicle width direction from both end portions 3a, 3a, and are bent rearward at their tip portions to bend the bumper B.
Penetrates through. A gap is provided between the bumper B and the tail pipes 6 and 6 so as not to collide with or interfere with each other even when the tail pipes 6 and 6 vibrate.

Further, as shown in FIGS. 5, 6 and 7, a support bracket 31, which supports the tail pipes 6, 6, is provided.
One end of 31 is connected above the tail pipes 6 and 6 at both ends 3a and 3a, and the other end is connected to the tail pipes 6 and 6.

According to this, as shown by symbols A, A, and C in FIG. 6, both ends 3a, 3a of the support bracket 31, 31 and the silencer 3 each having a connection point with the other two are connected.
Since the rigid structure is formed by the combination of the tail pipes 6, 6 with the tail pipes 6, 6, the rigidity around these connected parts and the support rigidity of the tail pipes 6, 6 to the silencer 3 are improved.
Further, ribs 31b and 31b are provided on the outer side surfaces of the support brackets 31 and 31, and the rigidity is further enhanced.

Next, the first support mechanism 9, 9 and the second support mechanism 10, 10 will be described. First, the first support mechanisms 9 and 9 are attached to the vehicle body frame F2 side, and are rod-shaped first vehicle body side suspension brackets 41 and 41 provided with first fixed shafts 41a and 41a extending in the vehicle body width direction.
And the first fixed shaft 41 attached to the silencer 3 side.
silencer side suspension rods 42, 42 provided with first moving shafts 42a, 42a extending parallel to a, 41a,
These two shafts 41a, 41a, 42a, 42a pass through and have first hanger rubbers 43, 43 that can swing in the vehicle front-rear direction about the first fixed shafts 41a, 41a. When the vibration occurs, the first hanger rubbers 43, 43 swing in the front-rear direction about the first fixed shafts 41a, 41a to allow the first movable shafts 42a, 42a to move in the front-rear direction. is doing.

The second support mechanisms 10 and 10 are attached to the vehicle body frame F2 side, and are rod-shaped second vehicle body side hanging brackets 51 and 51 provided with second fixed shafts 51a and 51a extending in the vehicle body front-rear direction. And a silencer-side suspension rod 52, 52 provided with a second moving shaft 52a, 52a attached to the silencer 3 side and extending in parallel to the second fixed shaft 51a, 51a, and both shafts 51a, 51a.
a, 52a, 52a penetrate, and the second fixed shafts 51a, 51
and a second hanger rubber 53, 53 capable of swinging in the width direction of the vehicle body about a. The second hanger rubber 53, 53 swings in the width direction of the vehicle body about the second fixed shafts 51a, 51a. The second moving shafts 52a, 52a
The vehicle is allowed to move in the width direction.

The first silencer side suspension brackets 42, 42 having the first moving shafts 42a, 42a are provided.
And the second silencer-side suspension brackets 52, 52 having the second moving shafts 52a, 52a are integrated into left and right to form L-shaped rods 61, 61, respectively.
The L-shaped rods 61, 61 correspond to the support bracket 3 described above.
Upward grooves 3 having a semi-circular cross section provided on the upper portions of the reference numerals 1 and 31.
The inner surfaces of 1a and 31a are fixed to the second moving shafts 52a and 52a.

According to this, the silencer 3 includes the first and second fixed shafts 41a, 41a, 51a, 51a of the first and second support mechanisms 9, 9, 10, 10 and the first and second fixed shafts. Through the hanger rubbers 43, 43, 53, 53, the L-shaped rods 61, 61 to which the first and second moving shafts 42a, 42a, 52a, 52a are connected, and the support brackets 31, 31, at both ends. While being suspended and supported, the first support mechanisms 9 and 9 allow movement in the vehicle front-rear direction, and the second support mechanisms 10 and 10 allow movement in the vehicle width direction.

When the silencer 3 is vibrated in the longitudinal direction of the vehicle body, it is allowed to move in the longitudinal direction of the vehicle body.
The first hanger rubber 43, 43 of the support mechanism 9, 9 is the first
Since the second support shafts 10, 10a, 51a of the second support mechanism 10, 10 swing in the vehicle body longitudinal direction about the fixed shafts 41a, 41a and allow the movement in the vehicle body width direction, they extend in the vehicle longitudinal direction. The second hanger rubbers 53, 53 do not swing so much in the longitudinal direction of the vehicle body. On the other hand, when vibration occurs in the vehicle body width direction, the second hanger rubbers 53, 53 of the second support mechanisms 10, 10 that allow movement in the vehicle body width direction have the vehicle body width centered on the second fixed shafts 51a, 51a. Since the first fixed shafts 41a, 41a of the first support mechanisms 9, 9 that swing in the vehicle body direction and allow movement in the vehicle body front-rear direction extend in the vehicle body width direction, the first hanger rubber 4
3, 43 do not swing so much in the vehicle width direction.

In this case, since the first and second hanger rubbers 43, 43, 53, 53 are connected to each other by the L-shaped silencer-side suspension rod 61 penetrating the respective lower parts, When both the vibration in the direction of the vehicle and the vibration in the width direction of the vehicle body are generated, they try to regulate the rocking with each other.
It is deformed by the elasticity of 3, 53 itself and allows the above vibration.

That is, the first and second support mechanisms 9, 9, 1
0 and 10 do not completely allow or completely restrict the vibration of the silencer 3, and the
The second hanger rubbers 43, 43, 53, 53 are allowed to be elastically deformed within a range in which they can be swiftly increased without increasing the amplitude thereof regardless of whether the vibration in the vehicle front-rear direction or the vehicle width direction occurs. To converge to.

Therefore, even if the exhaust pipes 1 and 2 and the silencer 3 vibrate in any of the vehicle body front-rear direction and the vehicle body width direction, or in a direction in which these are combined, for example, due to braking or cornering, The vibration is allowed and absorbed by the two support mechanisms 9, 9, 10, 10 and is not transmitted to the vehicle body, so that the riding feeling is not deteriorated.

Further, since the above-mentioned vibration is allowed and absorbed by the swinging and deformation of the first and second hanger rubbers 43, 43, 53, 53, no stress is generated at the connecting portion between the silencer 3 and the vehicle body. , The connection is not fatigued and damaged.

Further, even if the exhaust pipes 1 and 2 are thermally expanded, the expansion is allowed and absorbed by the first support mechanisms 9 and 9 which allow movement in the vehicle front-rear direction. As in the case where the vibration occurs, the connecting portion between the vehicle body frame F2 and the first and second vehicle body side suspension brackets 41 and 51, and the first and second silencer side suspension brackets 42 and 41 connected to the silencer 3. No stress is generated in the connecting portions with 52, and these connecting portions are not fatigued and damaged.

When the distance between the pair of left and right second fixed shafts is the same as the distance between the pair of left and right second moving shafts, a parallelogram link is formed, and the silencer moves in the vehicle width direction, for example, the silencer. Vibration in the width direction is not suppressed.
Therefore, as shown in FIG. 7, a pair of left and right second fixed shafts 51a,
51a is set to X1 and the pair of left and right second moving shafts 52
Vibration is suppressed by making the distance between a and 52a different from each other by setting X2 smaller than X1. In that case, it is particularly preferable to form a trapezoid as shown in FIG. The second moving shaft 52
Even when the distance X2 between the a and 52a is larger than the distance X1 between the second fixed shafts 51a and 51a, substantially the same effect can be obtained.

Further, the first permitting movement in the longitudinal direction of the vehicle body
The support mechanisms 9, 9 are arranged in front of both ends 3a, 3a of the silencer 3, and the second support mechanism 10, 10 allowing movement in the vehicle body width direction is provided at the rear side of both ends 3a, 3a of the silencer 3. It is arranged. According to this, when the silencer 3 and the exhaust pipes 2 and 4 vibrate due to, for example, cornering of the vehicle, the vibration is in a horizontal plane centered substantially at the center in the longitudinal direction of the vehicle body, and its amplitude is As the distance from the center increases, that is, the rear side of the silencer 3 becomes larger than the front side of the silencer 3, the second support mechanisms 10, 10 that allow movement in the vehicle body width direction are provided on the rear sides of the both ends 3a, 3a of the silencer 3. Since it supports the vibration, it is possible to more effectively allow and absorb the vibration. The front side and the rear side can be interchanged.

Further, since the upstream side exhaust pipe 2 and the downstream side exhaust pipe 4 are connected by the flexible joint 5, the engine vibration generated in the upstream side exhaust pipe 2 is not transmitted to the downstream side exhaust pipe 4. Vibration of the silencer 3 in the vertical direction of the vehicle body generated in the downstream side exhaust pipe 4 is not transmitted. That is, even if vibration occurs in the vehicle body vertical direction on either the upstream side or the downstream side of the flexible joint 5, the vibration is not transmitted to the other side.

On the other hand, for example, when the tail pipe 6 is connected only to the end of the silencer 3, the silencer 3
When the vibrations occur, the tail pipe 6 vibrates with the connecting portion as a fulcrum and stress is generated in the connecting portion, which may cause fatigue and damage of the connecting portion. However, in the present invention, each of them is connected to the other two connecting points. This is not the case with the above. Similarly, there is no risk of fatigue and damage to the connection, as is the case, for example, when the bracket supporting the silencer is connected only to the ends of the silencer. That is, even if the silencer 3 vibrates, the vibration is not concentrated on the specific connection portion and is dispersed, so that the connection portion is not fatigued and damaged due to stress.

The tail pipe 6 is connected to the silencer 3
And the support bracket 31 extend to almost the height of the connection point A, and the connection point C between the tail pipe 6 and the support bracket 31 is, in the height direction, the connection point A between the silencer 3 and the support bracket 31, and the silencer 3. It is located in the middle of the connection point a with the tail pipe 6, and these connection points a,
(A) and (c) have a substantially isosceles triangular rigid body structure, so that the rigidity in the vicinity of the connection point and the supporting rigidity of the tail pipe 6 to the silencer 3 are further enhanced.

By the way, if the tail pipe penetrates through the bumper, it may come into contact with the bumper when the tail pipe vibrates, but the first and second support mechanisms 9, 9, 10,
Even if the vibration is allowed and absorbed by one of the ten, the vibration is suppressed by the other, so that it is possible to prevent the tail pipe 6 from coming into contact with the end portion thereof and causing heat loss or damage.

In this embodiment, the flexible joint 5 connects the upstream side exhaust pipe 2 and the downstream side exhaust pipe so as to be vertically movable, but is limited to only vertically movable. is not.

[0054]

As described above, according to the present invention, even in an exhaust system having a silencer that is long in the vehicle body width direction, a support means that allows the vehicle body longitudinal movement and a support that allows the vehicle body width direction movement. By supporting the silencer and the exhaust pipe with the means, it is possible to provide the structure of the exhaust system that allows not only the movement in the vehicle front-rear direction but also the movement in the vehicle width direction.

[Brief description of drawings]

FIG. 1 is a side view of an exhaust system structure according to an embodiment of the present invention.

FIG. 2 is a plan view of the downstream side exhaust system.

FIG. 3 is an arrow view of the upstream side support mechanism taken along the line AA in FIG.

FIG. 4 is an arrow view of the downstream side support mechanism taken along line BB in FIG.

FIG. 5 is a schematic perspective view of one end of the silencer.

FIG. 6 is a view taken along the line C-C in FIG.

FIG. 7 is a view taken along arrow E in FIG.

[Description of Reference Signs] 3 Silencer 4 Downstream Exhaust Pipe 9 First Support Mechanism (Support Means Allowing Movement in Front-Back Direction of Vehicle) 10 Second Support Mechanism (Support Means Allowing Movement in Width Direction of Vehicle) 31 Support Bracket 41a , 51a Fixed shaft (vehicle body side suspension bracket) 42a, 52a Moving shaft (silencer side suspension bracket) 43, 53 Hanger rubber (elastic body)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshitaka Nakamura             3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda             Within the corporation F-term (reference) 3D038 BA01 BA02 BA13 BA14 BA18                       BB01 BC07 BC12 BC24                 3G004 AA01 BA04 BA09 DA13 EA03

Claims (8)

[Claims] 1. An exhaust system structure in which a silencer long in the vehicle body width direction is attached to a downstream end portion of an exhaust pipe, wherein the silencer has two left and right sides arranged at a front side and a rear side of both ends of the vehicle body width direction. While being supported by the vehicle body through a pair of supporting means, one of the supporting means allows movement of the exhaust pipe and the silencer in the vehicle longitudinal direction, and the other supporting means in the vehicle width direction of the exhaust pipe and the silencer. Exhaust system structure characterized by permitting movement. 2. The exhaust pipe comprises an upstream exhaust pipe connected to the engine and a downstream exhaust pipe attached to a silencer.
The exhaust system structure according to claim 1, wherein the exhaust system structures are connected by a flexible joint. 3. A support means for allowing movement in the front-rear direction of the vehicle body is arranged on the front side of both ends of the silencer, and a support means for allowing movement in the vehicle width direction is arranged on the rear side of both ends of the silencer. The exhaust system structure according to claim 1 or 2, wherein 4. The support means for allowing movement in the vehicle body front-rear direction is a first fixed shaft attached to the vehicle body side and extending in the vehicle body width direction, and a first fixed shaft attached to the silencer side and extending parallel to the first fixed shaft. The moving axis and the first through which both these axes pass
The supporting means having an elastic body and allowing movement in the vehicle width direction is a second mounting means that is attached to the vehicle body side and extends in the vehicle body front-rear direction.
The first and second moving shafts have a fixed shaft, a second moving shaft that is attached to the silencer side and extends parallel to the second fixed shaft, and a second elastic body that penetrates both of these shafts. The exhaust system structure according to any one of claims 1 to 3, wherein the exhaust system structure is integrated in an L shape. 5. A tail pipe extends in the vehicle body width direction from both ends of the silencer, and support brackets for supporting the tail pipe to the silencer are connected at both ends of the silencer above the tail pipe, and are integrated in an L shape. The exhaust system structure according to claim 4, wherein the first and second moving shafts that are formed are supported by the support bracket. 6. The tail pipe extends to the height of the connection point between the silencer and the support bracket, and the connection point between the tail pipe and the support bracket is in the height direction, the connection point between the silencer and the support bracket, and the silencer. The exhaust system structure according to claim 5, wherein the exhaust system structure is located substantially in the middle of the connection point with the tail pipe. 7. The exhaust system structure according to claim 5, wherein an end portion of the tail pipe extends rearward of the vehicle body and penetrates a rear bumper. 8. The support means for allowing movement in the vehicle body width direction is characterized in that a distance between a pair of left and right second fixed shafts and a distance between a pair of left and right second movement shafts are different from each other. The exhaust system structure according to any one of claims 4 to 7.