JP2004108227A - Muffler supporting structure of silencer in car - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the displacement of a muffler to a vehicle body while reducing transmission of the vibration of the muffler to the vehicle body in a supporting device of the muffler to be connected to an exhaust system of an engine on a lower portion of the vehicle body. <P>SOLUTION: Two supporting points S1 and S2 are provided on a front edge of a muffler M with an interval in the direction substantially orthogonal to the longitudinal axis of the muffler M, and the supporting points S1 and S2 are supported by a lower portion of a vehicle body B via a single elastic body 13. One supporting point S3 is provided on a rear edge of the muffler M, and the supporting point S3 is supported by a lower portion of the vehicle body via another elastic body 24. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a structure for supporting a silencer connected to an exhaust system extending rearward from a vehicle, mainly a traveling engine disposed in a front portion of a vehicle body, to a lower portion of the vehicle body.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a vehicle such as an automobile, an exhaust system connected to a traveling engine disposed in a front portion of a vehicle body is extended from the front portion of the vehicle body to the rear thereof, and exhaust gas flowing through the exhaust system is transmitted to a rear of the vehicle body. The muffler connected to the exhaust system is supported at the lower part of the vehicle body through a plurality of elastic bodies, and does not significantly displace from the vehicle body when a large external force acts on the muffler. The vibration applied to the muffler is not transmitted to the vehicle body (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-62-289428 [0004]
[Problems to be solved by the invention]
By the way, in the support structure of the muffler, even when a large external force acts on the muffler such as when the vehicle is traveling on a rough road or a sharp turn, the muffler is restrained from being largely displaced from the vehicle body. Function and a "vibration transmission cutoff function" for preventing vibration applied to the muffler from being transmitted to the vehicle body.
[0005]
However, if the static spring constant of the elastic body is set high in order to improve the "displacement restraining function", the dynamic spring constant also increases, so that the "vibration transmission cutoff function" decreases, and conversely, the If the dynamic spring constant of the elastic body is set low in order to improve the “vibration transmission cutoff function”, the static spring constant also decreases, and the “displacement restraining function” is in a conflicting relationship.
[0006]
Therefore, in actuality, in order to suppress the transmission of vibrations to the vehicle body, the physical properties, shape, etc. of the elastic body are determined so that the dynamic vibration constant is reduced by giving priority to the “vibration transmission cutoff function”, and furthermore, the layout On the other hand, in order to supplement the "displacement restraining function", measures such as separately providing a large number of support points by an elastic body and providing a stopper on the elastic body itself are taken.
[0007]
However, even if such measures are taken, it is difficult to sufficiently exert both the "vibration transmission blocking function" and the "displacement restraining function", and the structure of the elastic body itself becomes complicated or the number of And the cost increases.
[0008]
The present invention has been made in view of the above circumstances, and uses a material having a relatively low spring constant, which is not different from that generally used in the past, to secure a high "vibration transmission blocking function". It is another object of the present invention to provide a silencer support structure for a new vehicle, which is capable of improving the "displacement restraining function" while being simple in structure and inexpensive.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a muffler connected to an exhaust system of a traveling engine is disposed so that a longitudinal axis thereof is along a traveling direction of a vehicle, and a front end of the muffler is provided. A support structure for a muffler in a vehicle, wherein the muffler and the rear end are supported at a lower part of the vehicle body via an elastic body, wherein the muffler has a silencer at one of a front end and a rear end. Two first and second support points are provided at intervals in a direction substantially perpendicular to the longitudinal axis direction of the container, and one third support point is provided on the other side, and the first and second support points are provided. The second support point is supported at the lower part of the vehicle body via a single elastic body, and the third support point is supported at the lower part of the vehicle body via another elastic body. , The silencer is supported at three points by the first, second and third support points. Thus, the load applied to each support point can be reduced, and the spring constants of the single elastic body at the first and second support points and the other elastic body at the third support point can be set low, that is, soft. Therefore, the transmission of vibration transmitted to the muffler due to the operation of the engine or the like to the vehicle body can be reduced as much as possible. As a result, the "vibration transmission cutoff function" can be greatly improved. The first and second support points, which are arranged in a direction substantially perpendicular to the longitudinal axis of the container, are supported by the lower part of the vehicle body via a single elastic body, so that the elastic constant of the elastic body is high, that is, the elasticity is high. Even if it is not set, the restraining force against the displacement of the silencer can be increased, and even when an external force is excessively applied to the silencer, for example, during a sharp turn of the vehicle, a sufficient displacement restraining function for the silencer can be achieved. And as a result, Also the place restraint function "can be greatly improved.
[0010]
In order to achieve the object, the invention according to claim 2 is the invention according to claim 1, wherein the center of gravity of the muffler is located within a virtual triangle connecting the first, second, and third support points. Are arranged. According to such a feature, a line segment connecting the first and second support points, a line segment connecting the first and third support points, and a line segment connecting the second and third support points are provided. Since all the moments around the line segment can be reduced, the propagation of vibration transmitted to the silencer due to the operation of the engine, etc. to the vehicle body can be more effectively reduced, and the "vibration transmission cutoff function" Further improvement can be achieved.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
[0012]
First, a first embodiment of the present invention will be described with reference to FIGS.
[0013]
1 is an overall side view of a silencer support structure in the vehicle of the present invention, FIG. 2 is an enlarged perspective view taken along a line 2 in FIG. 1, FIG. 3 is a view taken along a line 3 in FIG. 2, and FIG. 3, FIG. 5 is a sectional view taken along line 5-5 in FIG.
[0014]
This embodiment is a case where the present invention is applied to an exhaust system of a driving engine of an automobile. In FIG. 1, exhaust gas exhausted from the engine E is provided to an exhaust port of the driving engine E in FIG. An exhaust system Ex for silencing and releasing to the atmosphere is connected. The exhaust system Ex is supported by a lower portion of the vehicle body B of the automobile, and extends along the front-back direction of the vehicle body B.
[0015]
As shown in FIG. 1, an exhaust port of the engine E is connected to an exhaust pipe 1 of an exhaust system Ex via an exhaust manifold (not shown), and the exhaust pipe 1 is connected to an exhaust catalyst from an upstream side to a downstream side. Ca, an auxiliary silencer (primary muffler) Ma, and a main muffler (secondary muffler) M as a muffler according to the present invention are connected in order at intervals, and at the downstream end of the main muffler M, The tail pipe 2 is connected. The main silencer M is arranged so that the longitudinal axis thereof is along the traveling direction of the vehicle, and is supported by a lower portion of the vehicle body B via a support structure described later.
[0016]
Exhaust gas flowing through the exhaust system Ex is purified of harmful components such as HC, CO, and NOx by the exhaust catalyst Ca, and the exhaust noise is silenced by the auxiliary and main silencers Ma and M and then to the atmosphere via the tail pipe 2. Released.
[0017]
As shown in FIGS. 2 to 4, the silencer main body 3 of the main silencer M has a shell 4 formed of a cylindrical body having an elliptical cross section, and front and rear open ends formed of elliptical plates. It is formed in a sealed shape, and a silencer for exhaust gas noise is provided therein. However, since this silencer is conventionally known, a detailed description thereof will be omitted.
[0018]
The opening edge of the shell 4 and the outer edges of the front and rear end plates 5 and 6 are superimposed on each other, wound around the outer edge of the shell 4 and joined in an airtight manner. The exhaust pipe 1 is integrally connected to the front end plate 5 and is connected to an inlet pipe 7 (see FIG. 5) in the main silencer M. The tail pipe 2 is integrally connected to the rear end plate 6. Connected.
[0019]
The lightweight auxiliary silencer Ma is supported at the lower part of the vehicle body B via a supporting member and an elastic body. However, since this supporting means employs conventionally known technical means, a detailed description thereof will be omitted.
[0020]
Next, a description will be given of a support structure of the main silencer M, which has a main silencing effect of exhaust noise and is relatively heavy, on the lower part of the vehicle body B according to the present invention.
[0021]
The heavy main silencer M has two front ends supported at a lower portion of the vehicle body via a single elastic body 13, and a rear end edge provided at a lower portion of the vehicle body B via another elastic body 24. One point is supported.
[0022]
As shown in FIGS. 1 and 2, a front support member 8 is fixed to the upper end edge of the front surface of the muffler main body 3 by welding or the like so as to be deviated to one side with respect to the longitudinal axis of the main muffler M. This front support member 8 is made of a heat-resistant metal pipe, and as shown most clearly in FIG. 4, an outer support portion 9 bent in an L-shape and an intermediate support portion 10 bent in a U-shape. , The inner support portion 11 bent in an L-shape is integrally formed by welding or the like, and the lower surfaces of the support portions 9, 10, 11 are welded to the upper surface of the front end edge of the main silencer M by welding or the like. The upright portion 9a of the outer support portion 9 and the upright portion 11a of the inner support portion 11 are fixed to the left and right upright portions 10a, 10b of the intermediate portion support portion 10 by welding or the like. The upper end of the front support member 8, that is, the upright portion 9 a of the outer support portion 9 and the upright portion 10 b of the intermediate support portion 10 are spaced apart from each other in a direction substantially orthogonal to the longitudinal axis of the main silencer M. Support points, that is, first and second support points S1 and S2 are set.
[0023]
A single elastic body 13 is supported at the first and second support points S1, S of the support member 8. The elastic body 13 is made of a natural or synthetic rubber material. When the elastic body 13 is connected between the lower part of the vehicle body B and the main muffler M, as shown in FIGS. , Facing the front-back direction of the vehicle body B. As shown in FIG. 4, the elastic body 13 has a regular triangular shape as viewed from the front-rear direction of the vehicle body B, and has a boss-like upper end connecting portion 13a and a left end at the upper end and left and right ends. The right connecting portions 13b and 13c are formed integrally with each other, and a hole 13d is opened at the center thereof. At the connecting portions 13a, 13b, 13c, mounting holes 14, 15, 16 in the front-rear direction of the vehicle body B are respectively provided so as to penetrate, and the mounting holes 15, 16 of the left and right connecting portions 13b, 13c are respectively provided with the front holes. The bent upper ends of the upright portions 9a and 10b of the outer and intermediate support portions 9 and 10 of the portion support member 8 are inserted and connected, and are fixed to a lower portion of the vehicle body B in mounting holes 14 of the upper end connecting portion 13a. The bent lower end of the front suspension member 18 on the vehicle body side is inserted and connected. Thus, the front edge of the main silencer M is provided at the lower part of the vehicle body B via the single elastic body 13 at a distance in the direction substantially perpendicular to the longitudinal axis direction of the main silencer M. Two points are supported by the first and second support points S1 and S2.
[0024]
As shown in FIGS. 2 and 3, when viewed from a plane, the rear end of the main silencer M is located at a diagonal position of the front end with respect to the first and second support points S1 and S2. It is elastically supported at one point by a rear suspension member 25 under the vehicle body B via a single elastic body 24. The rear support member 20 is made of a heat-resistant metal pipe, and the bases of the L-shaped outer and inner support members 21 and 22 are fixed to the rear end edges of the muffler by welding or the like, and their upright portions are formed. The members are fixed together by welding or the like, and a third support point S3 is set at the upper end of the upright portion. A conventionally known single elastic body 24 is connected to the bent upper end of the upright portion of the rear support member 20 constituting the third support point S3. The other elastic body 24 is made of a natural or synthetic rubber material and has a flat plate shape having the same thickness over its entire area. The elastic body 24 supports the rear end edge of the main silencer M below the vehicle body B. When used in such a case, the thickness direction of the other elastic body 24 is oriented in the front-rear direction of the vehicle body B as shown in FIG. The front shape of the other elastic body 24, that is, the shape viewed from the front-back direction of the vehicle body B is an elliptical shape that is long in the up-down direction. Upper and lower portions of the other elastic body 24 are provided with lower mounting holes 26 and 27 that penetrate in the front-rear direction of the vehicle body B. The lower end of the rear suspension member 25 suspended from the lower part of the vehicle body B is inserted into the upper mounting hole 26 and connected thereto, and the lower mounting hole 27 is provided with the main silencer constituting the one support point S3. The bent upper end of the rear support member 20 on the M side is inserted and connected. Thus, the rear end edge of the main silencer M is supported at one point below the vehicle body B via the other elastic body 24.
[0025]
Thus, the main silencer M has two front and rear supporting edges S1 and S1 at the front suspension member 18 below the vehicle body B via the front support member 8 and the single elastic body 13. , S2, and the rear edge thereof is connected to the rear suspension member 25 at the lower part of the vehicle body B via the rear support member 20 and the single other elastic body 24, and to one third support point S3. As a result, as shown in FIG. 3, the main silencer M is supported at the first, second, and third support points S1, S2, and S3 below the vehicle body B. Are located at the vertices of the virtual triangle as viewed from the plane, and the center of gravity G of the main silencer M is located within this virtual triangle.
[0026]
Next, the operation of the first embodiment will be described.
[0027]
Now, due to the operation of the engine E, the exhaust gas discharged therefrom flows into the exhaust pipe 1, passes through the catalyst Ca, the auxiliary silencer Ma, and the main silencer M and is discharged to the atmosphere. In the exhaust gas flowing through the exhaust system Ex, the harmful components such as HC, CO, and NOx contained in the exhaust gas are purified and removed in the catalyst Ca, and the exhaust noise is supplementarily reduced in the auxiliary silencer Ma. Then, the main silencer M silences the main exhaust noise.
[0028]
By the way, the main silencer M as the silencer according to the present invention is supported at three points by the first, second and third support points S1, S2, S3, so that the respective support points S1, S2, By reducing the shared load applied to S3, the spring constants of the single elastic body 13 at the first and second support points and the single other elastic body 24 at the third support point are all set low, that is, set to be soft. In addition, since the center of gravity G of the main silencer M is located within a virtual triangle connecting the support points S1, S2, and S3, the first and second support points S1, Since the moment around the line segment L1 connecting S2, the line segment L2 connecting the first and third support points S1 and S3, and the line segment L3 connecting the second and third support points S2 and S3 can be reduced. , Transmitted to main silencer M by engine operation, etc. Are as much as possible the propagation of the vehicle body B of the vibration can be reduced, so that the the "vibration transmission cutoff function" can be significantly improved.
[0029]
Further, the first and second support points S1 and S arranged in a direction substantially perpendicular to the longitudinal axis direction of the main silencer M are supported by the lower part of the vehicle body B via a single elastic body 13, Even if the spring constant of the elastic body 13 is not set high, that is, it is possible to increase the restraining force against the displacement of the main silencer M, especially when the vehicle is turning sharply, the excessive external force is applied to the main silencer M. Can exert a sufficient displacement restricting function for the main silencer M, and as a result, the "displacement restricting function" can be greatly improved.
[0030]
Next, a second embodiment of the present invention will be described with reference to FIG.
[0031]
FIG. 6 is an overall plan view of an exhaust system embodying the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals.
[0032]
In the second embodiment, a pair of main silencers M is connected to the exhaust system Ex. The downstream side of the exhaust pipe 1 is bifurcated in the left-right direction with respect to the vehicle body B. A main silencer M is connected to each of 1a and 1b. As in the first embodiment, the pair of main silencers M are arranged such that the longitudinal axis thereof is along the traveling direction of the vehicle, and the support structure for the lower part of the vehicle body B is the same as that of the first embodiment. Since they are the same, the same operation and effect as in the first embodiment can be obtained.
[0033]
Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments, and various embodiments are possible within the scope of the present invention.
[0034]
For example, in the above-described embodiment, the case where the present invention is applied to the main muffler support structure has been described. However, it goes without saying that the present invention can be applied to other muffler support structures having the above-mentioned problems. Also, first and second support points are provided at the rear end edge of the muffler, and these are supported at the lower part of the vehicle body via a single elastic body, and a third support point is provided at the front end edge. It may be supported on the lower part of the vehicle body via another elastic body. Further, the single elastic body commonly provided at the first and second support points may have any configuration as long as it has an intended function. It is also possible to employ the elastic body disclosed in Japanese Patent No. 82139.
[0035]
【The invention's effect】
As described above, according to the invention described in the claims, the muffler is supported at the lower part of the vehicle body at three points by the first, second, and third support points, so that the muffler is provided at each support point. Since the shared load can be reduced and the spring constants of the single elastic body at the first and second support points and the other elastic body at the third support point can be set low, that is, the spring constant can be set softly. The transmission of the vibration transmitted to the silencer to the vehicle body can be reduced as much as possible, and as a result, the "vibration transmission cutoff function" can be greatly improved. The first and second support points, which are arranged in directions substantially orthogonal to each other, are supported by the lower part of the vehicle body via a single elastic body, so that the elastic constant of the elastic body is high, that is, even if the elastic constant is not set to be rigid, the noise can be reduced. Can increase the restraining force against the displacement of the Even when an external force acts excessively on the silencer, for example, during a sharp turn, a sufficient displacement restricting function for the silencer can be exhibited, and as a result, the "displacement restricting function" can be significantly improved. .
[0036]
According to the second aspect of the present invention, the center of gravity of the silencer is arranged in a virtual triangle connecting the first, second, and third support points, so that the first, second, and third points are arranged. Since the moments around the line connecting the support points, the line connecting the first and third support points, and the line connecting the second and third support points can be reduced, the vibration transmitted to the silencer can be reduced. Can be more effectively reduced, and the "vibration transmission cutoff function" can be further improved.
[Brief description of the drawings]
FIG. 1 is an overall plan view of a silencer support structure in a vehicle (first embodiment).
FIG. 2 is an enlarged perspective view taken along a line 2 in FIG. 1 FIG. 3 is a view taken along a line 3 in FIG. 2 FIG. 4 is a view taken along a line 4 in FIG. 3 FIG. FIG. 6 is a plan view of a silencer support structure in a vehicle (second embodiment).
[Explanation of symbols]
13 ... Elastic body 24 ... Other elastic body B ... Body E ... Engine Ex: Exhaust system G: Center of gravity M: Silencer (main silencer)
S1... First support point S2... Second support point S3... Third support point

Claims (2)

A silencer (M) connected to an exhaust system (Ex) of the traveling engine (E) is arranged so that the longitudinal axis thereof is along the traveling direction of the vehicle, and a front end and a rear end of the silencer (M) are arranged. A silencer supporting structure for a vehicle, wherein the supporting member is supported at a lower part of the vehicle body via elastic bodies (13, 24),
Two first and second support points at one of a front end and a rear end of the silencer (M) at an interval in a direction substantially perpendicular to a longitudinal axis direction of the silencer (M). (S1, S2) and one third support point (S3) on the other side, and the first and second support points (S1, S2) are connected to a single elastic body (13). ), And the third support point (S3) is supported by the lower part of the vehicle body through another elastic body (24). The center of gravity (G) of the silencer (M) is arranged within a virtual triangle connecting the first, second, and third support points (S1, S2, S3). Item 2. A support structure for a muffler in a vehicle according to Item 1.

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