JP2001295645A - Exhaust pipe support structure - Google Patents

Abstract

[PROBLEMS] To reduce the thermal effect of an elastic body to improve its durability and to enable fine adjustment of an exhaust pipe support position when mounted on a vehicle without increasing manufacturing costs. SOLUTION: In an exhaust pipe support structure for elastically supporting an exhaust pipe 11 on a vehicle body, a support member 14 is fastened to the outer periphery of the exhaust pipe 11 via a heat insulating material, and extends from the support member 14 along the exhaust pipe 11. And a rubber mounting member 16 having a rubber mounting portion 15 extending therefrom. The rubber mounting portion 15 is connected to the support rod 19 on the vehicle body side via a support rubber 20 so as to be rotatable around the exhaust pipe 11. Exhaust pipe 1
The heat of 1 is cut off by the heat insulating material, and is hardly transmitted to the support rubber 20. If the distance between the rubber mounting portion 15 and the support rod 19 deviates from the regular dimension, the rubber mounting portion 15 is
By rotating the exhaust pipe 11 around the exhaust pipe 9, the gap can be absorbed. Thus, the problem can be solved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust pipe support structure for elastically supporting an exhaust pipe on a vehicle body.

[0002]

2. Description of the Related Art A structure disclosed in Japanese Utility Model Laid-Open Publication No. Sho 61-70517 is known as a structure for supporting an exhaust pipe of this type. That is, in the exhaust pipe support structure, a bolt is passed through a through hole at one end of the mount rubber, and one end of the exhaust pipe is fixed to the vehicle body side bracket by the bolt and the nut. At the same time, a bolt is passed through the through hole at the other end of the mount rubber, and the other end is fixed to the exhaust pipe side bracket with this bolt and nut. A position adjusting member having a mounting hole for inserting a bolt at an eccentric position is fitted in at least one of the two through holes of the mount rubber. In this exhaust pipe support structure, the gap between the two bolts can be adjusted by rotating and adjusting the position adjusting member with respect to the mount rubber, thereby absorbing a shift in the gap between the two bolts due to manufacturing and assembly errors. can do.

[0003]

However, in the above-mentioned prior art, the following problems occur. (1) The heat of the exhaust pipe is transmitted to the mount rubber via the exhaust pipe side bracket and the bolts and nuts, and the mount rubber is deteriorated by the heat. For this reason, the exhaust pipe cannot be elastically supported on the vehicle body, and performance (NV performance) against sound and vibration deteriorates. (2) In order to be able to absorb the displacement of the distance between the two bolts due to an assembly error or the like when mounted on a vehicle, the mounting hole is set at an eccentric position in one of the two through holes of the mount rubber. The formed position adjusting member is fitted. Therefore, the number of parts and the number of assembling steps are increased, and the manufacturing cost is increased.

The present invention has been made in view of such conventional problems, and its object is to reduce the thermal effect of the elastic body to improve its durability and to increase the manufacturing cost. Another object of the present invention is to provide an exhaust pipe support structure that enables fine adjustment of an exhaust pipe support position when mounted on a vehicle.

[0005]

The means for solving the above-mentioned problems and the effects thereof will be described below. Claim 1
The invention according to the invention relates to an exhaust pipe support structure for elastically supporting an exhaust pipe with respect to a vehicle body, wherein the support member is fixed to an outer periphery of the exhaust pipe via a heat insulating material, and extends from the support member. An elastic body mounting member having a mounting part extending along the exhaust pipe, the mounting part of the elastic body mounting member being rotatable about the exhaust pipe with respect to a support rod erected on the vehicle body side, It is characterized in that it is connected to the support rod via an elastic body.

According to this structure, since the support member is fastened to the outer periphery of the exhaust pipe via the heat insulating material, the heat of the exhaust pipe is shut off by the heat insulating material. For this reason, the heat of the exhaust pipe is not easily transmitted to the elastic body via the support member and the elastic body mounting member,
Deterioration of the elastic body due to heat is reduced. Therefore, the thermal effect of the elastic body interposed between the exhaust pipe and the vehicle body can be reduced, and the durability thereof can be improved.

Further, if the distance between the mounting portion of the elastic body mounting member and the support rod erected on the vehicle body side deviates from a regular size due to a manufacturing error or an assembly error when mounted on the vehicle, the mounting portion is supported. By rotating the exhaust pipe with respect to the rod as a center, the distance can be made closer to a regular size, and a shift in the distance between the mounting portion and the support rod can be absorbed. For this reason, it is not necessary to provide a special component in order to absorb the displacement as in the above-described related art. Therefore, fine adjustment of the exhaust pipe support position when mounted on the vehicle can be performed without increasing the manufacturing cost.

The invention according to claim 2 is characterized in that a nut is integrally provided with the support member, and the support member is fastened to the exhaust pipe by screwing a bolt to the nut. I do.

According to this configuration, the support member can be easily fastened to the exhaust pipe only by screwing and tightening the bolt to the nut integrated with the support member. Claim 3
The present invention is characterized in that a projection for positioning the support member in the front-rear position is provided on the outer periphery of the exhaust pipe.

According to this configuration, the support member is fastened to the exhaust pipe in a state where the front and rear positions thereof are positioned by fastening the support member with one edge of the support member pressed against the projection. be able to.

The invention according to claim 4 is that the heat insulating material comprises:
A projection is provided extending continuously or discontinuously in the circumferential direction, and the support member is provided with a concave portion that engages with the projection of the heat insulating material.

According to this configuration, the support member is fastened to the exhaust pipe in a state where the concave portion of the support member is engaged with the projection of the heat insulating material, so that the support member and the heat insulating material are always positioned at the regular relative positions. can do. At the same time, the supporting member and the heat insulating material do not shift due to vibration during traveling.

The invention according to claim 5 is characterized in that the elastic member attaching member is provided on both sides of the support member. According to this configuration, since one supporting point of the exhaust pipe is elastically supported at two locations on the vehicle body side via the supporting members provided on both sides thereof, the exhaust pipe support strength is increased and the exhaust pipe is supported. Can be stably supported.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an exhaust pipe support structure according to each embodiment embodying the present invention will be described with reference to the drawings. (First Embodiment) A support structure for an exhaust pipe according to a first embodiment will be described with reference to FIGS.

As shown in FIG. 1, the exhaust pipe support structure elastically supports an exhaust pipe 11 of a vehicle such as an automobile with respect to a vehicle body. The exhaust pipe 11 has a front end connected to the engine, and supports several places such as an intermediate part and a rear end thereof on a vehicle body side bracket (not shown) by the exhaust pipe support structure according to the present embodiment. Have been. FIG. 1 shows only a part of the exhaust pipe 11 that is supported by the exhaust pipe support structure.

As shown in FIGS. 1 to 3, the exhaust pipe support structure includes a belt-shaped support member 14 fastened to the outer periphery of the exhaust pipe 11 through heat insulating materials 12 and 13, and extends from the support member 14. And a rubber mounting member 16 as an elastic body mounting member having a rubber mounting portion 15 extending along the exhaust pipe 11.

The heat insulating materials 12 and 13 are semi-cylindrical halves, and when the corresponding ends are matched with each other, the heat insulating materials are tightly fitted to the outer periphery of the exhaust pipe 11 so as to cover the entire periphery. Have been. Further, the heat insulating materials 12 and 13 are made by solidifying a material having both the heat insulating effect and the buffer effect, for example, a heat insulating material such as ceramics or glass.

The support member 14 is a strip-shaped metal plate having a length sufficiently larger than the outer diameter of the heat insulating materials 12 and 13 attached to the outer periphery of the exhaust pipe 11. A nut 17 is integrated with one end of the support member 14 in the longitudinal direction by welding. At the other end of the support member 14, a through-hole (not shown) through which the threaded portion of the bolt 18 is inserted is formed. And
The support member 14 is wound around the outer circumference of the heat insulators 12 and 13, and the bolt 18 is screwed into the nut 17 and tightened, so that the support member 14 is fastened to the exhaust pipe 11 via the heat insulators 12 and 13.

The rubber mounting member 16 is an L-shaped metal rod (or metal cylinder) bent at a substantially right angle.
An end of the rubber mounting member 16 is fixed to the one end by welding or the like such that a short portion of the length of the rubber mounting member 16 extends radially outward from the one end of the support member 14 in the exhaust pipe 11. ing. Due to such fixing, the rubber mounting portion 15, which is a long portion of the rubber mounting member 16, extends substantially parallel to the axis of the exhaust pipe 11.

The rubber mounting portion 15 of the rubber mounting member 16
Is a support rod 19 erected on the vehicle body side bracket (the vehicle body side).
The support rod 19 is connected to the support rod 19 via a support rubber 20 (elastic body) so as to be rotatable about the exhaust pipe 11. That is, as shown in FIGS. 1 and 4, the support rubber 20 is provided with a through hole 21 in which the rubber mounting portion 15 is fitted and a through hole 22 in which the support rod 19 is fitted substantially in parallel. . The support rubber 20 is attached to the rubber mounting portion 15 by elastically fitting the through hole 21 into the rubber mounting portion 15 from the locking portion 23 at the tip of the rubber mounting portion 15. The support rod 19 is attached to the support rubber 20 by resiliently fitting the support rod 19 into the through hole 22 of the support rubber 20 from the locking portion 24 at the tip thereof. Accordingly, when the gap (pitch) between the rubber mounting portion 15 and the support rod 19 is deviated from the regular pitch (regular dimension) P1 due to a manufacturing error, an assembly error when mounted on a vehicle, or the like, the rubber mounting portion 15 Is rotated with respect to the support rod 19 so that the interval can be made closer to the regular pitch.

As shown in FIG. 4, the support rubber 20 has an elliptical cross section and a predetermined thickness. In the support rubber 20, the through holes 21 and 22 are provided at positions substantially symmetrical with respect to the center in the long axis direction, and a center partition wall 25 extending in the short axis direction at the center of both the through holes, Formed through holes 26 and 27 on both sides of the wall are formed.

The supporting member 1 is provided on the outer periphery of the exhaust pipe 11.
An annular projection 28 is provided for positioning the front-back position of the exhaust pipe 4, that is, the position on the exhaust pipe 11 in the front-rear direction. As shown in FIG. 3, each of the heat insulating materials 12 and 13 is provided with a protrusion 29 extending continuously in the circumferential direction, and the support member 14 is provided with each of the heat insulating materials 12 and 13. 29
An annular concave portion 30 is provided which engages with the concave portion. Each projection 29 may be a projection that extends discontinuously in the circumferential direction.

According to the first embodiment configured as described above, the following operation and effect can be obtained. (1) The support member 14 is provided on the outer periphery of the exhaust pipe 11
Since the fastening is performed via the heat insulating members 12 and 13, the heat of the exhaust pipe 11 is blocked by the heat insulating materials 12 and 13. For this reason, the exhaust pipe 1
1 is hard to be transmitted to the support rubber 20 via the support member 14 and the rubber mounting member 16, and the deterioration of the support rubber 20 due to the heat is reduced. Therefore, the thermal effect of the support rubber 20 interposed between the exhaust pipe 11 and the vehicle body can be reduced, and the durability thereof can be improved. As a result, the exhaust pipe 11 can be elastically supported on the vehicle body for a long period of time, and the performance against sound and vibration (NV performance)
Can be prevented from deteriorating. (2) When the interval between the rubber mounting portion 15 and the support rod 19 is deviated from the regular pitch P1 due to a manufacturing error and an assembly error when mounted on a vehicle, the rubber mounting portion 15 is centered on the exhaust pipe 11 with respect to the support rod 19. To make the interval closer to the regular pitch P1. For example, as shown in FIG. 5, when the support rubber 20 contracts at the pitch P2 smaller than the regular pitch P1, the rubber mounting portion 15
Is rotated to a position shown by a two-dot chain line so that the interval approaches the regular pitch P1. Thereby, the support rubber 20 contracted as shown in FIG. 5 returns to its original shape due to its own elasticity, and the function of the support rubber 20 for elastically supporting the exhaust pipe 11 is not impaired. Conversely, even when the interval becomes larger than the regular pitch P1 and the support rubber 20 extends, the rubber mounting portion 15 is rotated so that the interval approaches the regular dimension. As a result, the extended support rubber 20 returns to its original shape due to its own elasticity, and the elastically supporting function is not impaired.

As described above, the rubber mounting portion 15 is
On the other hand, by rotating the exhaust pipe 11 in a predetermined direction, the gap between the rubber mounting portion 15 and the support rod 19 can be absorbed. For this reason, it is not necessary to provide a special component in order to absorb the displacement as in the above-described related art. Therefore, fine adjustment of the exhaust pipe support position when mounted on the vehicle can be performed without increasing the manufacturing cost. (3) The support member 14 can be easily fastened to the exhaust pipe 11 only by screwing and tightening the bolt 18 to the nut 17 integrated with the support member 14. (4) One edge of the support member 14 is connected to the protrusion 2 of the exhaust pipe 11.
8 (see FIGS. 1 and 3), the support member 1
By fastening 4, the support member 14 can be fastened to the exhaust pipe 11 with its front and rear positions positioned. (5) In a state in which the concave portion 30 of the support member 14 is engaged with each protrusion 29 of the heat insulating materials 12 and 13 (see FIG. 3), the support member 14
Is fastened to the exhaust pipe 11, so that the support member 14 and the heat insulating materials 12, 13 can always be positioned at regular relative positions. At the same time, the support member 14 and the heat insulating materials 12 and 13 do not shift due to vibration during traveling. (Second Embodiment) Next, an exhaust pipe support structure according to a second embodiment of the present invention will be described with reference to FIGS. This embodiment is basically different from the first embodiment in that rubber attachment members 16 are provided on both sides of the support member 14. The description of the same parts as in the first embodiment is omitted.

In this embodiment, the support member 14 is composed of two strip-shaped metal plates 31 and 32. Metal plate 32
Is the same width as the metal plate 31 and longer than the metal plate 31.
Both ends of the metal plate 32 are V-shaped bent portions 3 respectively.
3, 34. The ends of the left and right rubber mounting members 16, 16 'are welded to the two bent portions 33, 34, respectively. Further, both bent portions 33 and 34 of the metal plate 32 are provided.
The nuts 17 are integrated at the inner positions. On the other hand, at both ends of the metal plate 31, through holes through which the screw portions of the bolts 18 are inserted are formed. Then, the two metal plates 31, 32 are wound around the outer circumferences of the heat insulating materials 12, 13, and the bolts 18, 18 are screwed into the nuts 17, 17, respectively, to be tightened.
Is fastened to the exhaust pipe 11 via heat insulating materials 12 and 13.

One of the left and right rubber mounting members 16 and 16 ′ is connected to a support rod 19 via a support rubber 20, and the other is connected to another support rod 19 ′ via the support rubber 20. ing. This support rod 19 ′ is also erected from the vehicle body side bracket similarly to the support rod 19.
Also, on the rubber mounting member 16 'side, the rubber mounting portion 15 is rotatable about the exhaust pipe 11 with respect to the support rod 19'.

According to the second embodiment, the following operation and effect can be obtained. (6) Since one supporting point of the exhaust pipe 11 is elastically supported at two places of the vehicle body side bracket via the supporting members 14 provided on both sides thereof, the supporting strength of the exhaust pipe 11 is increased, and exhaust is performed. The tube 11 can be stably supported. (Third Embodiment) Next, an exhaust pipe support structure according to a third embodiment of the present invention will be described with reference to FIG. The present embodiment is configured to support a connection portion of the exhaust pipe 11.

That is, in the present embodiment, among the pipes 40 and 41 connected to each other, an annular projection 42 is formed near the rear end of the front pipe 40. The inner peripheral surface of the front end 43 of the rear pipe 41 is closely fitted to the rear slope of the projection 42. Also, the protrusion 42 and the front end 4
3 and the entire outer peripheral surface of the protrusion 42 including the contact portion
Heat insulating materials 12 and 13 so as to cover the outer peripheral surfaces of the front and rear portions of the
Is attached. The support member 14 is fastened to the outside of the heat insulating members 12 and 13 in the same manner as in the first and second embodiments. Although not shown in FIG. 8, the support member 14 has a rubber attachment member 16 similar to the first embodiment or a rubber attachment member 16 or 16 'similar to the second embodiment. Fixed. Thus, the connection portion of the exhaust pipe 11 is elastically supported by the vehicle body-side bracket via the support rubber 20.

According to the third embodiment, the following operation and effect can be obtained. (7) The entire outer peripheral surface of the protruding portion 42 including the contact portion between the protruding portion 42 of the front pipe 40 and the front end 43 of the rear pipe 41 and the outer peripheral surface of the front and rear portions of the protruding portion 42 A support member 14 is fastened to the outer periphery of both heat insulating materials 12 and 13 while being air-tightly covered with 13. For this reason, the airtightness at the connection part of the exhaust pipe 11 is ensured by the heat insulating materials 12 and 13, and the connection part can be elastically supported by the vehicle body side bracket. (Modification) The present invention can be embodied with the following modifications.

In each of the above embodiments, the heat insulating material 12,
Although 13 is made of a material having both a heat insulating effect and a buffer effect, the heat insulating materials 12 and 13 may have a laminated structure of a heat insulating material and a buffer material.

In each of the above embodiments, the support rubber 20 is not limited to an elliptical cross section, but may have a cross section of another shape. In the above embodiments, the support rubber 20 may be formed of an elastic body other than rubber, for example, an elastomer.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a support structure of an exhaust pipe according to a first embodiment.

FIG. 2 is a longitudinal sectional view of an exhaust pipe portion of the support structure shown in FIG.

FIG. 3 is a cross-sectional view of an exhaust pipe portion of the support structure shown in FIG.

FIG. 4 is a plan view showing a support rubber of the support structure shown in FIG. 1;

FIG. 5 is an explanatory view illustrating fine adjustment of a support rubber of the support structure shown in FIG. 1;

FIG. 6 is a schematic configuration diagram showing a support structure of an exhaust pipe according to a second embodiment.

7 is a partial cross-sectional view in which a part of the support structure shown in FIG. 6 is omitted and only an exhaust pipe portion is shown in cross section.

FIG. 8 is a cross-sectional view showing only an exhaust pipe portion in an exhaust pipe support structure according to a third embodiment.

[Explanation of symbols]

11 ... exhaust pipe, 12, 13 ... heat insulating material, 14 ... support member,
17 nut, 18 bolt, 19 support rod, 20 support rubber (elastic body), 28 projection, 29, 42 projection, 30 recess.

Claims (5)

[Claims] 1. An exhaust pipe support structure for elastically supporting an exhaust pipe with respect to a vehicle body, comprising: a support member fastened to an outer periphery of the exhaust pipe via a heat insulating material; An elastic body mounting member having a mounting part extending along the exhaust pipe, the mounting part of the elastic body mounting member being rotatable about the exhaust pipe with respect to a support rod erected on the vehicle body side, An exhaust pipe support structure, which is connected to a support rod via an elastic body. 2. The support member according to claim 1, wherein a nut is provided integrally with the support member, and the support member is fastened to the exhaust pipe by screwing a bolt to the nut. Exhaust pipe support structure. 3. The exhaust pipe support structure according to claim 1, wherein a projection for positioning the support member in the front-rear position is provided on an outer periphery of the exhaust pipe. 4. The heat insulating material is provided with a protrusion extending continuously or discontinuously in a circumferential direction, and the support member is provided with a concave portion which engages with the protrusion of the heat insulating material. The exhaust pipe support structure according to any one of claims 1 to 3, wherein: 5. The exhaust pipe support structure according to claim 1, wherein the elastic body attachment member is provided on both sides of the support member.