JPH06280555A - Supporting construction of exhaust pipe for vehicle - Google Patents

Abstract

(57) [Summary] [Purpose] The exhaust pipe is directly attached to the vehicle body, and the mounting dimension (height) is lowered, which enables the floor of the vehicle body to be made lower and Improve space efficiency. [Structure] Exhaust pipe 1 of engine with respect to vehicle body 20
When supporting 0, the exhaust pipe 10 is composed of a plurality of divided bodies in the longitudinal direction and is connected by a flexible joint, and the exhaust pipe 10 can be inserted through the metal mesh or honeycomb. Alternatively, an annular or tubular contact layer 24 made of fibers, a heat insulating layer 26 made of a heat insulating material formed on the outer periphery of the contact layer 24, and an elastic layer 28 made of an elastic material formed on the outer periphery of the contact layer 24 are sequentially laminated. Via the annular or tubular support of the structure
It was fixed directly to the vehicle body 20.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a vehicle exhaust pipe support structure, and more particularly to a structure for directly fixing and supporting an engine exhaust pipe to a vehicle body of an automobile or the like.

[0002]

2. Description of the Related Art Generally, an exhaust pipe of an engine (internal combustion engine) in a vehicle such as an automobile is connected to the engine at its front end portion, and a predetermined elastic support member, a so-called muffler, with respect to a vehicle body at its intermediate portion or rear portion. It is elastically suspended and supported via a support.

That is, the support to the vehicle body side through the elastic supports in the middle and rear of the exhaust pipe has hitherto been carried out in Japanese Utility Model Laid-Open No. 59-186574 and Japanese Utility Model Laid-Open No. 4-10.
As disclosed in Japanese Patent No. 9414, etc., a bracket fixed to the vehicle body (body) side and a bracket welded and fixed to the outer peripheral surface of the exhaust pipe are connected to each other via an elastic support member to thereby form an exhaust pipe. Is configured to be softly moved to avoid breakage or breakage of the exhaust pipe itself due to vibration or shaking of the exhaust pipe.

Therefore, in such a conventional exhaust pipe support structure, the exhaust pipe is suspended and supported from the vehicle body by a predetermined length through the bracket and the elastic support. In order to suspend and support such an exhaust pipe, it is inevitable that a mounting space with a predetermined height (H) is present below the vehicle body, and therefore the height of the vehicle body is low (low floor). However, there was a problem that the space efficiency in the passenger compartment could not be improved.

[0005]

The present invention has been made in view of such circumstances, and the problem to be solved is to attach an exhaust pipe directly to a vehicle body,
As a result, the mounting dimension (height) of the vehicle body can be reduced, and the floor of the vehicle body can be reduced, thereby improving the space efficiency in the vehicle interior.

[0006]

In order to solve such a problem, according to the present invention, there is provided a vehicle exhaust pipe support structure for supporting an engine exhaust pipe with respect to a vehicle body. It is composed of a plurality of divided bodies in its longitudinal direction, and the plurality of divided bodies are connected by a flexible joint, and the exhaust pipe is made of a metal mesh, honeycomb or fiber through which the exhaust pipe is inserted. An annular or tubular contact layer, a heat insulating layer made of a predetermined heat insulating material formed on the outer circumference of the contact layer, and an elastic layer made of a predetermined elastic material formed further on the outer circumference of the heat insulating layer. A vehicle exhaust pipe support structure characterized by being directly fixed to the vehicle body via an annular or tubular support body having a structure in which layers are sequentially laminated is provided as its gist. is there.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail below with reference to the drawings in order to clarify the present invention more specifically.

First, in FIG. 1 showing the overall structure of an exhaust pipe, reference numeral 10 denotes an exhaust pipe, which extends in the vehicle front-rear direction (left-right direction in the figure) below a vehicle body of an automobile or the like, as is well known. It is arranged as follows. In addition, the exhaust pipe 10 is located slightly forward of the central portion,
While the catalyst device 12 is provided, a muffler 14 is provided at the rear end portion thereof. Then, such an exhaust pipe 10 is connected at its front end portion to an exhaust manifold of an engine (not shown) so as to be installed, so that combustion exhaust gas discharged from the engine is purified and guided to the rear. On the other hand, the exhaust sound from the engine can be silenced.

Further, the exhaust pipe 10 includes a catalyst device 12
Of the engine side portion 10a, the catalyst device portion 10b,
The muffler portion 10c has a three-division structure including three divisions, and the divisions 10a to 10c are
They are connected to each other by flexible joints 16 and 16, respectively, so that they can be bent or bent at two points, respectively, in front of the catalyst device 12 and in front of the muffler 14.

In the present embodiment, the exhaust pipe 10 having such a three-part structure has the engine-side part 10a attached to the engine side, while the catalyst device part 10b and As shown in FIG. 2, the divided bodies 10c, which are muffler portions, are directly fixed to the vehicle body 20 by the mounting brackets 22 via the muffler support 18 as a support body.

By the way, the divided body 10 of the exhaust pipe 10
Muffler support 18 for fixing b and 10c
As is clear from FIGS. 3 to 5, is a ring-shaped or tubular body having a generally semi-cylindrical shape or a U-shape, and each of the divided bodies 10b and 10c is inserted into the contact. As a layer, there is an inner body 24 having a ring shape or a tubular shape made of a metal mesh, honeycomb or fiber. Here, the inner body 24 is made into a contact layer having a predetermined thickness by winding SUS wool. Then, on the outer peripheral portion of the inner body 24, an intermediate body 26 having a predetermined thickness is used as a heat insulating layer made of a solid or fibrous heat insulating material made of ceramics, glass or the like. Half split cylinders 26a, 2
6b, and a central hole made of a heat-resistant elastic material such as a predetermined elastic material, preferably silicone rubber or fluororubber as an elastic layer on the outer peripheral portion of the intermediate body 26. The outer body 28 having the above-mentioned shape is formed in a substantially U-shape as shown in the drawing, and the inner body 24, the intermediate body 26, and the outer body 28 are assembled in this order to form the muffler support 18. ing.

In the muffler support 18 as described above, the intermediate body 26 (half-split cylinder 26a,
26b) is provided between the outer peripheral surface and the inner peripheral surface of the central hole of the outer body 28, as shown in FIGS. A groove 28a for accommodating the mounting member 22 is provided on the curved outer peripheral surface of the, and a cutout 28b for inserting an exhaust pipe is provided so as to reach the central hole in the flat portion of the outer body 28. There is.

The muffler support 1 having such a structure
When fixing each divided body 10b, 10c portion of the exhaust pipe 10 to the vehicle body 20 by using 8, the SUS is first attached to a predetermined support portion of each divided body 10b, 10c portion.
The inner body 24 made of wool is wound, and the half-split cylinders 26a and 26b for providing the intermediate body 26 are arranged on the inner body 24, and the inner body 24 is accommodated in the central hole thereof through the notch 28b of the outer body 28. In the mounting structure as shown in FIG. 2, the exhaust pipe 10 is attached to the vehicle body by fitting the body 26 and the outer body 28 in a concavo-convex manner and then directly fixing the body 26 to the vehicle body 20 using the mounting bracket 22. Body 2
It can be attached to 0.

Therefore, in such an exhaust pipe support structure, the exhaust pipe 10 is made into a plurality of divided bodies (10a, 10b, 10c) in the longitudinal direction thereof, and the plurality of divided bodies are flexible. Since the exhaust pipes 10 are connected to each other by the joints 16, 16, the vibration and sway of the exhaust pipe 10 are divided into the individual divided bodies 10a, 10
b and 10c are dispersed as vibrations and vibrations, and the large vibrations of the exhaust pipe 10 as a whole can be effectively reduced or eliminated. Therefore, the exhaust pipes are softly moved to cause vibrations of the exhaust pipes. There is no need to adopt a conventional suspension and support structure for the exhaust pipe in order to avoid breakage or breakage of the exhaust pipe itself due to swaying, shaking, etc. It can be directly attached to the vehicle body 20.

When the exhaust pipe 10 is directly attached, the muffler support 1 having the structure as described above is used.
By adopting No. 8, the inner body 24, which is a contact layer, allows the exhaust pipe 10 to extend and move in the axial direction, while the heat of the exhaust pipe 10 is blocked by the intermediate body 26, which is a heat insulating layer.
Furthermore, vibration isolation can be effectively performed by the outer body 28 that is an elastic layer, and thus effective support of the exhaust pipe 10 can be realized.

Further, as a result of adopting such a structure for directly mounting the exhaust pipe 10 to the vehicle body 20, the mounting dimension (H) of the exhaust pipe 10 is as shown in FIG. Since it can be made significantly smaller than the suspension and support structure, it is possible to advantageously realize the vehicle body with a low floor and a large space in the vehicle compartment.

Although a typical embodiment of the present invention has been described above, this is a literal example, and the present invention should not be construed as being limited to such a specific example.

For example, the exhaust pipe 10 in the above embodiment.
Has a three-part structure composed of an engine-side part 10a, a catalyst device part 10b, and a muffler part 10c connected by two flexible joints 16, 16. However, there is no limitation on the number of parts. However, as long as it is possible to reduce the vibration and shaking of the exhaust pipe 10 as a whole,
It is also possible to adopt a two-division structure or a four-division structure.

As the flexible joint 16 for connecting the divided bodies (10a, 10b, 10c) for providing the exhaust pipe 10, various known ones can be appropriately adopted. It is possible to use those described in Japanese Patent Laid-Open No. 4-252732 and Japanese Patent Laid-Open No. 4-342820.

Further, according to the present invention, the exhaust pipe 10 (split bodies 10a, 10b, 10) using the muffler support 18 is used.
Even in the supporting position (mounting position) for the vehicle body 20 of c), the exhaust pipe 10 can be appropriately selected.
It is not necessary that all of the divided bodies constituting the vehicle are supported by the muffler support 18 with respect to the vehicle body 20, and not only one but a plurality of muffler supports 18 are used to form one divided body. It is also possible to support the vehicle body 20 with respect to the vehicle body 20.

Further, the structure or shape of each constituent body (24, 26, 28) of the muffler support 18 can be appropriately selected. For example, each constituent body in the above-mentioned concrete example. Although it was made as a separate body, it can also be made as an integral body, and the intermediate body 26 can be used as an annular or tubular integral body, instead of being made into a half-divided cylinder body. Even if the body 28 is not provided with the notch 28b,
No problem whatsoever.

Although not listed one by one, the present invention is
The present invention can be carried out in a mode in which various modifications, changes, improvements, etc. are added based on the knowledge of a person skilled in the art, and such an embodiment is not limited to the scope of the present invention. Needless to say, it belongs to the category of.

[0023]

As is apparent from the above description, according to the present invention, the exhaust pipe of the engine in the vehicle is directly fixed to the vehicle body, so that the mounting dimension of the exhaust pipe is the same as that of the conventional exhaust gas. Compared with the suspension support structure of the pipe, it can be made significantly shorter, which allows the vehicle body to have a low floor, which can effectively widen the space in the passenger compartment and improve its space efficiency. It is possible to exert an excellent effect that it can be advantageously increased.

[Brief description of drawings]

FIG. 1 is an explanatory view schematically showing an example of a support structure for a vehicle exhaust pipe according to the present invention.

FIG. 2 is a cross-sectional explanatory view schematically showing an attachment portion using a muffler support for a vehicle body in the exhaust pipe support structure shown in FIG.

FIG. 3 is a cutaway sectional explanatory view showing a specific example of a flexible joint suitably used in the exhaust pipe support structure shown in FIG. 1.

FIG. 4 is a sectional view taken along line AA in FIG.

FIG. 5 is an explanatory diagram showing a procedure for assembling the muffler support and the mounting bracket shown in FIGS. 3 and 4 to the exhaust pipe.

[Explanation of symbols]

10 Exhaust pipe 10a, 10
b, 10c Split body 12 Catalytic device 14 Muffler 16 Flexible joint 18 Muffler support 20 Vehicle body 22 Mounting bracket 24 Inner body (contact layer) 26 Intermediate body (heat insulating layer) 28 Outer body (elastic layer)

Claims (1)

[Claims] 1. A vehicle exhaust pipe support structure for supporting an engine exhaust pipe with respect to a vehicle body, wherein the exhaust pipe is composed of a plurality of divided bodies in a longitudinal direction thereof. Are connected by a flexible joint, and the exhaust pipe is formed on the outer periphery of the contact layer and an annular or tubular contact layer made of a metal mesh, honeycomb or fiber through which the exhaust pipe is inserted. Via a ring-shaped or tubular support having a structure in which a heat insulating layer made of a predetermined heat insulating material and an elastic layer made of a predetermined elastic material formed on the outer periphery of the heat insulating layer are sequentially laminated. A support structure for an exhaust pipe for a vehicle, wherein the support structure is directly fixed to the vehicle body.