JPH0858400A - Car body supporting device for exhaust system structure - Google Patents

Abstract

PURPOSE: To prevent an exhaust system structure from interfering with a car body even when caused an input of moving largely upward the exhaust system structure, in a car body supporting device for the exhaust system structure constituted by elastically supporting the exhaust system structure on the car body. CONSTITUTION: In this constitution, right/left mount rubbers 8, 7, tilt arranged in right/left symmetry by making a distance different between car body side supporting points and between muffler side supporting points, and an elastic stopper 9, connecting both ends to one right/left supporting pin parts 4a, 3a of long intersupporting point distance to link in a position overlapped by a plan view with the other right/left supporting pin parts 6a, 5a of short intersupporting point distance, are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body supporting device for an exhaust system structure such as an exhaust muffler.

[0002]

2. Description of the Related Art Conventionally, as a vehicle body supporting device for an exhaust muffler, for example, one shown in FIG. 10 is known.

That is, in a vehicle body support device for an exhaust muffler in which an exhaust muffler is elastically supported on a vehicle body floor, a left vehicle body side bracket and a right vehicle body side bracket provided at left and right positions of the vehicle body floor and a left and right position of the exhaust muffler. The left muffler side bracket and the right muffler side bracket provided and the distance between the vehicle body side fulcrum and the muffler side fulcrum are made different so that the left mount rubber and the left mount rubber which are symmetrically inclined (reverse C-shaped) are provided. It is a device equipped with a right mount rubber.

[0004]

However, in the conventional vehicle body supporting device for the exhaust muffler, when the exhaust muffler moves up and down due to a large vertical input during traveling, the left and right mount rubbers exhaust the exhaust gas. As the muffler moves up and down around the fulcrum on the vehicle body without being restricted, the exhaust muffler moves largely upward and interferes with the vehicle floor.

As a result, the exhaust muffler and / or the vehicle body floor may be deformed or damaged,
Moreover, a loud collision sound is generated at the time of interference.

The present invention has been made in view of the above problems. A first object of the present invention is to provide an exhaust system structure body supporting apparatus in which an exhaust system structure is elastically supported by a vehicle body. This is to prevent the exhaust system structure from interfering with the vehicle body even when there is an input to move the system structure largely upward.

The second purpose is to reduce vibration of a specific frequency input to the vehicle body via the left and right mount rubbers in addition to the first purpose.

In addition to the second object, the third object is to prevent the metal contact noise from being generated even when the elastic body vibrates greatly.

The fourth object is to improve the workability of assembling the apparatus in addition to the first to third objects.

[0010]

In order to achieve the first object, the first invention according to claim 1 is a vehicle body supporting apparatus for an exhaust system structure, wherein the exhaust system structure is elastically supported by a vehicle body. , A left vehicle body side bracket and a right vehicle body side bracket which are provided at the left and right positions of the vehicle body and have a support pin portion in the vehicle front-rear direction, and a left portion which is provided at the left and right positions of the exhaust system structure and have a vehicle front and rear direction support pin portion The distance between the fulcrum and the left mount rubber and the right mount rubber that are symmetrically inclined by making the distances between the structure side bracket and the right structure side bracket, and between the vehicle body side fulcrum and the structure side fulcrum different. Both ends are connected to the left and right support pin parts on the long side of
The other left and right support pin part with a short distance between fulcrums is an elastic body that is laid over at a position where it overlaps in the plan view,
It is characterized by having.

In order to achieve the above-mentioned second object, in the second invention according to claim 2, in the vehicle body supporting device for exhaust system structure according to claim 1, the elastic body is provided with a mass body at its central portion. It is an elastic body having, and is characterized in that its resonance frequency is tuned in order to reduce a specific vibration input to the vehicle body via the left and right mount rubbers.

In order to achieve the above-mentioned third object, according to a third aspect of the present invention, in the vehicle body supporting device for the exhaust system structure according to the second aspect, the mass body is built in the central portion of the elastic body. It is characterized by being.

In order to achieve the above-mentioned fourth object, according to a fourth aspect of the present invention, in the vehicle body supporting device for the exhaust system structure according to the first to third aspects, the support pin portion of the bracket is Each mount rubber and a guide surface having a diameter gradually increasing from the inner diameter of the insertion hole formed in the elastic body and a guide stopper having a stopper diameter larger than the inner diameter of the insertion hole are provided at the tip. Is characterized by.

[0014]

The operation of the first invention will be described.

The left mount rubber is attached between support pin portions in the vehicle front-rear direction provided on the left vehicle body side bracket and the left structure side bracket. Also, the right mount rubber is
It is attached between the support pin portions in the vehicle front-rear direction provided on the right vehicle body side bracket and the right structure side bracket. And
The exhaust system structure is elastically supported by the vehicle body via the left mount rubber and the right mount rubber that are symmetrically inclined and arranged by making the distances between the vehicle body side fulcrums and the structure side fulcrums different from each other.

Therefore, the vibration input transmitted to the vehicle body from the exhaust system structure swaying while traveling is attenuated by the vibration isolation effect of the left and right mount rubbers provided in the vibration transmission path.

Further, when the exhaust system structure swings largely in the vertical direction due to the unevenness of the road surface or the like, the left and right mount rubbers try to rotate with the upward movement of the exhaust system structure centering on the vehicle body side fulcrum. However, the rotation of the mount rubber is restricted by the elastic body until the predetermined angular displacement.

That is, both ends of the elastic body are connected to one of the left and right support pin portions having a long fulcrum distance, and the elastic body is hung at a position overlapping with the other left and right support pin portions having a short fulcrum distance in plan view. Since it is passed, when the left and right support pin parts on the structure side rotate by an angle as the exhaust system structure moves upward, an elastic body with both ends connected to the left and right support pin parts with a long fulcrum distance. And the left and right support pin portions having a short distance between the fulcrums come into contact with each other, and the rotation angle increases by a slight elastic deformation amount due to the contact, but the left and right mount rubbers are restricted in rotation by a predetermined angular displacement.

As a result, the amount of upward movement of the exhaust system structure supported by the left and right mount rubbers is also restricted, and interference between the exhaust system structure and the vehicle body is prevented.

The operation of the second invention will be described.

Among the vibrations transmitted from the exhaust system structure to the vehicle body, the vibrations of a specific frequency include vibrations of an undesired frequency such as aggravating the body muffled noise.

On the other hand, the elastic body exhibiting the stopper function is an elastic body having a mass body at its center,
A dynamic damper using a mass body as a mass and an elastic body as a spring is configured, and its resonance frequency is tuned to reduce a specific vibration input to the vehicle body via the left and right mount rubbers.

Therefore, the vibration of a specific frequency input to the vehicle body from the exhaust system structure via the left and right mount rubbers is reduced by the dynamic vibration absorbing action.

The operation of the third invention will be described.

When the above-mentioned dynamic vibration absorbing action is exerted, the elastic body having the mass body vibrates violently in a resonance state, and may largely vibrate due to an input from the exhaust system structure or the vehicle body.

On the other hand, since the mass body for forming the dynamic damper is built in the central portion of the elastic body, even if there is a large deflection of the elastic body such that the mass body and the adjacent member interfere with each other. The elastic body that covers the mass body comes into contact with the mass body, and the metal contact sound between the mass body and the adjacent member is prevented from being generated.

The operation of the fourth invention will be described.

When assembling the exhaust system structure to the vehicle body, the mount rubber and the elastic body are attached to the bracket simply by inserting the support pin portions of the bracket into the mounting holes formed in the mount rubber and the elastic body. Can be attached by work.

That is, the support pin portion of the bracket is
Each mount rubber and elastic body have a guide surface that gradually increases in diameter from the inner diameter of the insertion hole and a guide stopper with a stopper diameter larger than the inner diameter of the insertion hole at the tip. During the work of inserting the support pin, the support pin can be inserted into the insertion hole while gradually increasing the insertion resistance by the guide surface, and after the insertion is completed, it can be removed without providing the stopper member due to the stopper diameter. To be prevented.

[0030]

Embodiments of the present invention will be described below with reference to the drawings.

First, the structure will be described.

FIG. 1 is an exploded perspective view showing a vehicle body support device for an exhaust muffler (vehicle body support device for an exhaust system structure) of an embodiment corresponding to the first invention to the fourth invention, and FIG. 2 is an exhaust gas of the embodiment. FIG. 3 is a plan view showing the vehicle body support device for the muffler, FIG. 3 is a view of the vehicle body support device for the exhaust muffler of the embodiment seen from the rear of the vehicle, FIG. 4 is a front view showing the elastic stopper of the embodiment device, and FIG.
FIG.

1 to 3, 1 is an exhaust muffler (corresponding to an exhaust system structure), 2 is a vehicle body floor (corresponding to a vehicle body),
3 is a left side bracket, 4 is a right side bracket, 5
Is a left muffler side bracket (corresponding to the left structure side bracket), 6 is a right muffler side bracket (corresponding to the right structure side bracket), 7 is a left mount rubber, 8 is a right mount rubber, and 9 is an elastic stopper (mass body). Corresponding to an elastic body).

The exhaust muffler 1 is arranged below the vehicle body floor 2 at the rear part of the vehicle, and the exhaust tube 10 and the tail tube 11 are connected to each other.

The left and right vehicle body side brackets 3, 4 are respectively provided at the left and right positions of the vehicle body floor 2 and have support pin portions 3a, 4a in the vehicle longitudinal direction.

At the tips of the support pin portions 3a, 4a, the diameter gradually increases from the diameter smaller than the inner diameters of the mounting holes 7a, 8a, 9a formed in the left and right mount rubbers 7, 8 and the elastic stopper 9. Guide surface and insertion holes 7a, 8a,
Guide stoppers 3b, 4b having a stopper diameter larger than the inner diameter of 9a are provided.

The left and right muffler side brackets 5 and 6 are
The exhaust muffler 1 is provided on the left and right sides of the rear end face,
The vehicle has front and rear support pin portions 5a and 6a.

At the tips of the support pin portions 5a and 6a, the insertion holes 7 formed in the left and right mount rubbers 7 and 8 are formed.
There are provided guide surfaces whose diameter gradually increases from a diameter smaller than the inner diameters of b and 8b, and guide stoppers 5b and 6b having a stopper diameter larger than the inner diameters of the insertion holes 7b and 8b.

The left and right mount rubbers 7 and 8 are substantially elliptical supporting elastic bodies provided with currants, and as shown in FIG. 3, the distance between the vehicle body side fulcrums is long and the distance between the muffler side fulcrums is short. By doing so, it is symmetrically arranged in an inverted V shape.

Both ends of the elastic stopper 9 are connected to left and right vehicle body side support pin portions 3a, 4a having a long fulcrum distance, and left and right muffler side support pin portions 5 having a short fulcrum distance.
As shown in FIG. 2, a and 6a are elastic bodies 9b that are laid over at overlapping positions in the plan view, and FIG.
Further, as shown in FIG. 5, the elastic body 9b has a mass body 9c built in the central portion thereof.

Since the elastic stopper 9 has the mass body 9c, a dynamic vibration absorber (dynamic damper) having the mass body 9c as a mass and the elastic body 9b as a spring is constructed, and the dynamic vibration absorbing effect is exhibited. The resonance frequency thereof is tuned to reduce a specific vibration having a specific frequency, which is input to the vehicle body via the left and right mount rubbers 7 and 8.

Next, the operation will be described.

[Anti-Vibration Supporting Function of Exhaust Muffler] The left mount rubber 7 is attached between the support pin portions 3a, 5a of the left vehicle body side bracket 3 and the left vehicle muffler side bracket 5 in the vehicle longitudinal direction. The right mount rubber 8 is attached between the support pin portions 4a, 6a in the vehicle front-rear direction of the right vehicle body side bracket 4 and the right muffler side bracket 6. Then, the exhaust muffler 1 has a left mount rubber 7 and a left mount rubber 7 that are symmetrically arranged in an inverted C-shape as shown in FIG. 3 by making the distances between the vehicle body side fulcrums and the muffler side fulcrums different from each other. Body floor 2 via right mount rubber 8
It is elastically supported by.

Therefore, the vibration input transmitted from the exhaust muffler 1 swaying during traveling or the like to the vehicle body floor 2 is damped by the vibration isolating action of the left and right mount rubbers 7 and 8 provided on the vibration transmission path.

[Action of Exhaust Muffler for Preventing Vehicle Body Interference] When the exhaust muffler 1 swings largely in the vertical direction due to road surface irregularities or the like, the exhaust muffler 1 is placed on the exhaust muffler 1 as shown by an arrow in FIG. The left and right mount rubbers 7, 8 try to rotate with the movement in the direction, but the rotation of the mount rubbers 7, 8 is restricted by the elastic stopper 9 to a predetermined angular displacement. That is, the elastic stopper 9
Is connected at both ends to the vehicle body side support pin portions 3a and 4a having a long fulcrum distance, and the left and right support pin portions 5a and 6a on the muffler side having a short fulcrum distance are shown in the plan view as shown in FIG. It is hung on the overlapping position,
When the exhaust muffler 1 moves upward by a certain angle as the left and right support pin portions 5a and 6a on the muffler side rotate by an angle, the elastic stoppers 9 whose both ends are connected to the support pin portions 3a and 4a on the vehicle body side having a long fulcrum distance. And the left and right support pin portions 5a and 6a on the muffler side having a short distance between the fulcrums come into contact with each other, and the rotation angle increases by a slight elastic deformation amount due to the contact, but the left and right mount rubbers 7 and 8 have a predetermined angle. Rotation is restricted by displacement.

As a result, the amount of upward movement of the exhaust muffler 1 supported by the left and right mount rubbers 7 and 8 is also restricted, and interference between the exhaust muffler 1 and the vehicle body floor 2 is prevented.

[Dynamic damper action] Exhaust muffler 1
Of the vibrations transmitted from the vehicle body floor 2 to the vehicle body floor 2, vibrations of a specific frequency include vibrations of undesired frequencies, such as exacerbating the body muffled noise.

On the other hand, the elastic stopper 9 exhibiting the above-mentioned stopper function is a dynamic damper having a mass body 9c at its central portion, and a specific damper input to the vehicle body floor 2 via the left and right mount rubbers 7 and 8. Its resonant frequency is tuned to reduce vibration.

Therefore, the vibration of a specific frequency, which is input from the exhaust muffler 1 to the vehicle body floor 2 via the left and right mount rubbers 7 and 8, is reduced by the dynamic vibration absorbing action of the elastic stopper 9.

[Effect of Metal Contact Sound of Elastic Stopper] When the above-mentioned dynamic vibration absorbing effect is exerted, the mass 9c
The elastic stopper 9 having
Further, a large swing may occur due to an input from the exhaust muffler 1 or the vehicle body floor 2.

On the other hand, since the mass body 9c for forming the dynamic damper is built in the central portion of the elastic body 9b, the mass body 9c and the adjacent member such as the vehicle body floor 2 interfere with each other. Even if the elastic stopper 9 swings, the elastic body 9b covering the mass body 9c comes into contact with the adjacent member, and the generation of a metal contact sound between the mass body 9c and the adjacent member is prevented.

[Exhaust muffler body assembly work] When assembling the exhaust muffler 1 to the vehicle body floor 2, the mount rubbers 7 and 8 for the brackets 3, 4, 5 and 6, respectively.
And the elastic stopper 9 are attached to the mount rubbers 7 and 8 and the insertion holes 7a and 7 formed in the elastic stopper 9, respectively.
b, 8a, 8b, 9a, 9a for each bracket 3,
It can be attached by simply inserting the support pin portions 3a, 4a, 5a, 6a of 4, 5, and 6.

That is, in the support pin portions 3a, 4a, 5a and 6a of the brackets 3, 4, 5 and 6, the mounting rubbers 7 and 8 and the insertion holes 7a formed in the elastic stopper 9,
7b, 8a, 8b, 9a, a guide surface whose diameter gradually increases from a diameter smaller than the inner diameter of 9a, and insertion holes 7a, 7b, 8
Since the guide stoppers 3b, 4b, 5b, 6b having a stopper diameter larger than the inner diameters of a, 8b, 9a, 9a are provided at the tips, the support pin portions 3a, 4a, 5a, 6a.
Insertion holes 7a, 7b, 8a, 8 while gradually increasing the insertion resistance by the guide surface
The support pin portions 3a, 4a, 5a, 6a can be inserted into b, 9a, 9a, and after the insertion is completed, the stopper diameter prevents the stopper pin 3 from coming off without providing a stopper member.

Next, the effect will be described.

(1) In a vehicle body support device for an exhaust muffler in which the exhaust muffler 1 is elastically supported on the vehicle body floor 2, the vehicle body side fulcrums and the muffler side fulcrums are made to have different distances so as to be symmetrically inclined. Both ends are connected to the left and right mount rubbers 7 and 8 and the left and right support pin portions 3a and 4a on the vehicle body side having a long fulcrum distance, and the left and right support pin portions 5a and 6a on the muffler side having a short fulcrum distance. Means that the device provided with the elastic stopper 9 that is laid over at the overlapping position in the plan view, the exhaust muffler 1 can be moved even when there is an input to move the exhaust muffler 1 largely upward.
Can be prevented from interfering with the vehicle body floor 2.

(2) The elastic stopper 9 is an elastic body 9b having a mass body 9c at the center thereof, and is intended to reduce a specific vibration input to the vehicle body floor 2 via the left and right mount rubbers 7 and 8. Since the resonance frequency is tuned, it is possible to reduce vibration of a specific frequency input to the vehicle body floor 2 via the left and right mount rubbers 7, 8.

(3) Since the elastic stopper 9 has the structure in which the mass body 9c is built in the central portion of the elastic body 9b, the metal contact noise is prevented from being generated even when the elastic stopper 9 largely shakes. You can

(4) In the support pin portions 3a, 4a, 5a and 6a of the brackets 3, 4, 5 and 6, the mounting rubbers 7 and 8 and the insertion holes 7a and 7 formed in the elastic stopper 9 are formed.
b, 8a, 8b, 9a, a guide surface whose diameter gradually increases from a diameter smaller than the inner diameter of 9a, and insertion holes 7a, 7b, 8
Since guide stoppers 3b, 4b, 5b, 6b having stopper diameters larger than the inner diameters of a, 8b, 9a, 9a are provided at the tips, the workability of assembling the device can be improved.

Although the embodiments have been described above with reference to the drawings, the specific configuration is not limited to the embodiments, and modifications and additions within the scope of the present invention are included in the present invention. Be done.

For example, in the embodiment, as the elastic stopper 9, the mass body 9c is built in the central portion of the elastic body 9b. However, as shown in FIGS. 6 and 7, the mass body 9c 'is elastic. It may be an example in which the body 9b 'is wound around and fixed to the outer periphery of the central portion.

Further, as shown in FIG. 8, the elastic stopper 9
Has a mass body 9c ″, stainless steel meshes 9d and 9d connected to both ends of the mass body 9c ″, and elastic bodies 9b ″ and 9b ″ connected to a single part of the stainless steel meshes 9d and 9d. It may be configured.

In the embodiment, the left and right maun bars 7 and 8 are arranged in an inverted C-shape, but as shown in FIG. 9, the left and right maun bars 7 and 8 are inclined in a V shape. The elastic stopper 9 may be arranged so as to connect the support pin portions 5a and 6a on the muffler side.

In the embodiment, the example of the exhaust muffler is shown as the exhaust system structure, but it may be applied to the vehicle body supporting device of other structures provided in the exhaust system such as the exhaust system catalyst.

[0064]

According to the first invention of claim 1,
In a vehicle body support device for an exhaust system structure in which an exhaust system structure is elastically supported by a vehicle body, a left mount symmetrically arranged by making the distance between the vehicle body side fulcrums and the structure side fulcrums different. Both ends are connected to the rubber and the right mount rubber, and the left and right support pin parts with one long fulcrum distance, and the other left and right support pin parts with a short fulcrum distance are bridged to overlap in the plan view. Since the elastic body is provided as an apparatus, it is possible to prevent the exhaust system structure from interfering with the vehicle body even when there is an input to move the exhaust system structure largely upward.

According to a second aspect of the present invention, in the vehicle body supporting device for the exhaust system structure according to the first aspect, the elastic body is an elastic body having a mass body at its center, and The resonance frequency is tuned so as to reduce the specific vibration input to the vehicle body via the mount rubber of the above. Therefore, in addition to the effect of the first invention, the resonance frequency is input to the vehicle body via the left and right mount rubbers. It is possible to obtain the effect that it is possible to reduce the vibration of the specified frequency.

According to a third aspect of the present invention, in the vehicle body supporting device for the exhaust system structure according to the second aspect, the mass body is a device built in the central portion of the elastic body. In addition to the effect of the second aspect of the invention, it is possible to obtain the effect that the metal contact noise can be prevented from being generated even when the elastic body vibrates greatly.

According to a fourth aspect of the present invention, in the vehicle body supporting device for an exhaust system structure according to any one of the first to third aspects, the support pin portion of the bracket includes the mount rubber and the elastic body. Since a guide surface whose diameter gradually increases from a diameter smaller than the inner diameter of the formed insertion hole and a guide stopper having a stopper diameter larger than the inner diameter of the insertion hole are provided at the tip, the above-mentioned first In addition to the effects of the invention to the third invention, the effect that the workability of assembling the device can be improved is obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a vehicle body support device for an exhaust muffler of an embodiment.

FIG. 2 is a plan view showing a vehicle body support device for an exhaust muffler of the embodiment.

FIG. 3 is a view of the vehicle body support device for the exhaust muffler of the embodiment as seen from the rear of the vehicle.

FIG. 4 is a front view showing an elastic stopper of the embodiment apparatus.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a front view showing another example of the elastic stopper.

7 is a cross-sectional view taken along the line BB of FIG.

FIG. 8 is a front view showing another example of the elastic stopper.

FIG. 9 is a view of a vehicle body support device for an exhaust muffler of another embodiment as viewed from the rear of the vehicle.

FIG. 10 is a view showing a conventional vehicle body support device for an exhaust muffler.

[Explanation of symbols]

 1 Exhaust muffler (exhaust system structure) 2 Body floor (car body) 3 Left vehicle body side bracket 4 Right vehicle body side bracket 5 Left muffler side bracket (left structure side bracket) 6 Right muffler side bracket (right structure side bracket) 7 Left mount rubber 8 Right mount rubber 9 Elastic stopper (elastic body with mass)

Claims (4)

[Claims] 1. A vehicle body support device for an exhaust system structure in which an exhaust system structure is elastically supported by a vehicle body. A left vehicle body side bracket and a right vehicle body side support bracket which are provided at left and right positions of the vehicle body and have support pin portions in the vehicle longitudinal direction. The brackets on the vehicle body side, the left structure side brackets and the right structure side brackets provided at the left and right positions of the exhaust system structure and having the support pin portions in the vehicle front-rear direction, and between the vehicle body side fulcrums and the structure side fulcrums By making the distances different, both ends are connected to the left and right mount rubbers that are symmetrically inclined and the left and right support pin parts with long distance between fulcrums, and the other left and right supports with short distance between fulcrums. A vehicle body support device for an exhaust system structure, wherein the pin portion includes an elastic body that is stretched over at a position where it overlaps in the plan view. 2. The vehicle body supporting apparatus for an exhaust system structure according to claim 1, wherein the elastic body is an elastic body having a mass body in a central portion thereof, and is input to the vehicle body via left and right mount rubbers. A vehicle body support device for an exhaust system structure, the resonance frequency of which is tuned to reduce a specific vibration. 3. The vehicle body supporting device for an exhaust system structure according to claim 2, wherein the mass body is built in a central portion of an elastic body. 4. The vehicle body support device for an exhaust system structure according to claim 1, wherein the support pin portion of the bracket has a diameter smaller than an inner diameter of an insertion hole formed in each mount rubber and the elastic body. A vehicle body supporting device for an exhaust system structure, comprising: a guide surface having a diameter gradually increasing from the above, and a guide stopper having a stopper diameter larger than the inner diameter of the insertion hole at the tip.