JP2006327555A - Mounting structure for exhaust system support member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure for an exhaust system support member capable of enhancing NV performance of a vehicle by hardly transmitting vibration of the exhaust system to a vehicle body by enhancing mounting rigidity and natural frequency of the exhaust system support member. <P>SOLUTION: In the mounting structure for the exhaust system support member for mounting the support member (10) (exhaust system support member) for supporting the exhaust system connected to an engine of the vehicle to the vehicle body of the vehicle, a base end 11 of the support member 10 is joined to a bottom surface 3d and a side surface 3e formed on a part of a rear part 1 of the vehicle body and an exhaust pipe 8 (exhaust system) is connected to a distal end 12 of the support member 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an exhaust system support member mounting structure for mounting an exhaust system support member that supports an exhaust system connected to an engine of a vehicle such as an automobile to a vehicle body of the vehicle.

As shown in FIG. 5, an exhaust system support member (hereinafter sometimes simply referred to as “support member”) for suspending an exhaust system connected to an automobile engine from the bottom of a vehicle body is a side view. There is a hook-shaped support member 50 constituted by a rod bent to have an L shape. In this support member 50, the vertical portion 50a is welded to the side surface 60a of the vehicle body frame 60, and the mounting portion 8a joined to the exhaust pipe 8 of the exhaust system via the elastic member 20 is connected to the horizontal portion 50b. For example, see Patent Document 1).
Japanese Patent Laying-Open No. 2001-082139 (paragraphs 0017 to 0029, FIG. 2)

  In the conventional support member 50 described above, vibration from the exhaust pipe 8 is transmitted to the tip of the horizontal portion 50b via the elastic member 20, and the entire support member 50 is rotated by the vertical component of the transmitted vibration. Moment becomes easy to act. Accordingly, the body frame 60 is easily deformed by the pressing force or the tensile force from the support member 50 on the side surface 60 a of the body frame 60.

  Further, since the body frame 60 is easily deformed, the natural frequency of the support member 50 is lowered, and the support member 50 resonates with respect to vibration transmitted from the exhaust pipe 8 to the horizontal member 50b through the elastic member 20. Therefore, the vibration of the exhaust system is easily transmitted to the vehicle body, and there is a problem that the NV (noise and vibration) performance of the automobile, that is, vibration noise and vibration suppression performance are lowered.

  Therefore, in the present invention, the NV performance of the vehicle can be improved by solving the above-described problems, increasing the mounting rigidity and natural frequency of the exhaust system support member, and making it difficult for vibration of the exhaust system to be transmitted to the vehicle body. It is an object of the present invention to provide an exhaust structure support member mounting structure.

  In order to solve the above-described problems, the present invention provides an exhaust system support member mounting structure for mounting an exhaust system support member that supports an exhaust system connected to an engine of a vehicle to a vehicle body of the vehicle. A base end portion of the member is joined to a bottom surface and a side surface formed on a part of the vehicle body, and an exhaust system is connected to a distal end portion of the exhaust system support member.

As described above, in the exhaust system support member mounting structure according to the present invention, the exhaust system support member is joined to the surfaces of different directions formed in a part of the vehicle body, and the vibration of the exhaust system is applied to the exhaust system support member. When transmitted, the pressing force or tensile force acting on the vehicle body from the exhaust system support member is dispersed. As a result, the mounting portion on the vehicle body side is less likely to be deformed by the pressing force or tensile force from the exhaust system support member, and the exhaust system support member's mounting rigidity and natural frequency can be increased. The vibration of the member can be reduced, the resonance of the exhaust system support member with respect to the vibration from the exhaust system can be prevented, and the vibration transmitted from the exhaust system to the vehicle body can be reduced.
Also, by joining the exhaust system support member to each surface in a different direction, not only the rigidity and natural frequency are increased against vertical vibration, but also the rigidity and natural frequency are measured against longitudinal and lateral vibration. Can be increased.

The base end portion of the exhaust system support member only needs to be bonded to at least one bottom surface and side surfaces, but may be bonded to a plurality of bottom surfaces and side surfaces, that is, three or more surfaces. Since the pressing force or tensile force acting on the vehicle body from the exhaust system support member is effectively dispersed, the mounting rigidity and natural frequency of the exhaust system support member can be further increased.
Further, if the bottom surface and side surface formed on a part of the vehicle body are formed in different directions, the bottom surface does not need to be horizontal or the side surface is vertical, even if it is inclined with respect to the horizontal or vertical. In addition, the orientation of the bottom surface and the orientation of the side surface may not be orthogonal to each other.

  In the above-described exhaust system support member mounting structure, it is desirable that the base end portion of the exhaust system support member is constituted by a rod bent corresponding to a bottom surface and a side surface formed in a part of the vehicle body.

  Thus, by using the exhaust system support member having a simple configuration, the base end portion of the exhaust system support member is configured by the rod bent in correspondence with the bottom surface and the side surface formed on a part of the vehicle body. The vibration transmitted from the exhaust system to the vehicle body can be reduced.

  In the exhaust system support member mounting structure described above, it is desirable that the exhaust system is connected to the tip of the exhaust system support member via an elastic member.

  Thus, by connecting the exhaust system to the tip of the exhaust system support member via the elastic member, the vibration transmitted to the exhaust system support member can be reduced by the vibration absorption effect of the elastic member. The vibration transmitted from the vehicle to the vehicle body can be effectively reduced.

  In the exhaust system support member mounting structure described above, the vehicle body includes a floor panel and a cross member joined to the rising portion of the floor panel, the bottom surface is the bottom surface of the cross member, and the side surface faces downward from the bottom surface. Thus, the corner portion of the L-shaped cross section is formed, and the base end portion of the exhaust system support member can be configured to be joined to the bottom surface and the side surface of the corner portion.

  In this way, the base end portion of the exhaust system support member is joined to the bottom surface of the cross member joined to the rising portion of the floor panel, and the exhaust system support member firmly fixed at a high position from the ground surface The system can be supported stably. This eliminates the need to support the exhaust system on the bottom surface of the floor panel, or greatly reduces the number of support points, and allows the exhaust system to be placed close to the bottom surface of the floor panel. A sufficient clearance from the upper surface can be secured.

  According to the exhaust system support member mounting structure of the present invention, the exhaust system support member is joined to each surface of a different direction formed on a part of the vehicle body, and vibration of the exhaust system is transmitted to the exhaust system support member. When this occurs, the pressing force or tensile force acting on the vehicle body from the exhaust system support member is dispersed. As a result, the mounting portion on the vehicle body side is less likely to be deformed by the pressing force or tensile force from the exhaust system support member, and the exhaust system support member's mounting rigidity and natural frequency can be increased. The vibration of the member can be reduced, and the resonance of the exhaust system support member with respect to the vibration from the exhaust system can be prevented. Therefore, vibration transmitted from the exhaust system to the vehicle body can be reduced, and the NV performance of the vehicle can be improved.

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
FIG. 1 is a perspective view of a main part of a rear part of a vehicle body to which a mounting structure for a support member in the present embodiment is applied as viewed from the rear. FIG. 2 is a perspective view of the mounting structure of the support member in the present embodiment as viewed from the rear. FIG. 3 is a side sectional view showing the mounting structure of the support member in the present embodiment.
In the following description, “front and rear”, “left and right”, and “up and down” correspond to each direction of the automobile (see FIG. 1).
First, the structure of the rear part of the vehicle body of the vehicle according to this embodiment will be described, and then the mounting structure of the support member (“exhaust system support member” in the claims) will be described.

[Configuration of rear body]
As shown in FIG. 1, a vehicle body rear portion 1 includes a pair of rear side frames 2, 2 disposed on the left and right sides of the vehicle body rear portion 1, and a middle cross member 3 and a rear portion that are installed between the rear side frames 2, 2. A cross member 4 is provided, and a rear floor panel 5 is extended between the rear side frames 2 and 2 from the middle cross member 3 toward the rear.

  The middle cross member 3 is a steel plate extending in the left-right direction of the rear part 1 of the vehicle body, and the rear part is vertically raised as shown in FIG. A vertical flange 3a extends downward from the front end, and a horizontal flange 3b extends rearward from the rear upper end. The upper surface of the horizontal flange 3b is the front end of the rear floor panel 5. It is joined to the part.

As shown in FIG. 1, the rear floor panel 5 has a vertical wall portion 5a formed at a substantially central portion in the front-rear direction, and extends from the upper end portion of the vertical wall portion 5a toward the middle cross member 3, An inclined wall portion 5b inclined obliquely downward in the middle and a horizontal wall portion 5c extending rearward from the lower end portion of the vertical wall portion 5a are formed. And the rear cross member 4 is joined to the corner part comprised by the front side surface of the vertical wall part 5a, and the bottom face of the inclination wall part 5b.
In addition, the inclined wall part 5b comprises the floor surface for attaching a rear seat (not shown), and the horizontal wall part 5c comprises the floor surface of the cargo compartment. Furthermore, the cross member 6 constructed by each rear side frame 2 and 2 is joined to the bottom face of the substantially center part in the front-back direction of the horizontal wall part 5c.

In addition, a pair of left and right side sills 9, 9 constituting the front part of the vehicle body are connected to the front end portions of the rear side frames 2, 2, and between the side sills 9, 9 forward from the middle cross member 3. A front floor panel 7 is extended toward the front.
As shown in FIG. 3, the front floor panel 7 has a vertical wall portion 7a raised at the rear, and the vertical wall portion 7a is joined to the front side surface 3c of the vertical flange 3a of the middle cross member 3 so as to be vertical. A horizontal wall portion 7 b extending rearward from the upper end portion of the wall portion 7 a is joined to the upper surface of the rear floor panel 5.

  Further, as shown in FIGS. 2 and 3, an exhaust pipe of an exhaust system extending from an exhaust port of an automobile engine (not shown) to a rear end portion of the rear body 1 is provided at the bottom of the rear body 1. 8 is suspended, and a support member 10 (an “exhaust system support member” in the claims) supporting the exhaust pipe 8 is joined to the middle cross member 3.

The support member 10 is a hook-shaped member formed of a rod having a circular cross section bent in a U shape in a side view, and a base end portion 11 is formed by an upper horizontal portion 10a and a vertical portion 10b. The front end portion 12 is constituted by the horizontal portion 10c on the side. The support member 10 is formed by bending a rod in accordance with the shape of a portion to be attached to the middle cross member 3 described later, and has a simple configuration.
Although the material of the support member 10 is not limited, it is necessary to use a material that can be welded to the middle cross member 3.

  An attachment hook 8 a of the exhaust pipe 8 is connected to the distal end portion 12 of the support member 10 via an elastic member 20. The attachment hook 8a of the exhaust pipe 8 is constituted by a rod having a circular cross section bent into an L shape, and the base end portion thereof is fixed to the outer surface of the exhaust pipe 8 via a fixing member 8b.

The elastic member 20 is an oval rubber member, and is formed with a pair of attachment holes 21a and 21b penetrating in the longitudinal direction (vertical direction). The support member 10 is provided in the attachment hole 21a disposed on the upper side. The distal end portion 12 of the exhaust pipe 8 is inserted into the mounting hole 21b disposed on the lower side.
In addition, diameter-expanded portions 12a and 8d having diameters larger than the mounting holes 21a and 21b of the elastic member 20 are formed at the end of the distal end portion 12 of the support member 10 and the end of the distal end portion 8c of the mounting hook 8a. The enlarged diameter portions 12a and 8d engage with the opening edges of the attachment holes 21a and 21b, thereby serving to prevent the support member 10 and the attachment hook 8a from coming off.

[Support member mounting structure]
Next, the mounting structure of the support member 10 will be specifically described.
As shown in FIGS. 2 and 3, the support member 10 has the horizontal portion 10 a of the base end portion 11 welded to the bottom surface 3 d of the middle cross member 3, and the vertical portion 10 b of the base end portion 11 is perpendicular to the middle cross member 3. It is joined to the middle cross member 3 by being welded to the rear side surface 3e of the flange 3a.

  Here, the vibration of the exhaust pipe 8 is transmitted to the distal end portion 12 of the support member 10 through the elastic member 20, and a rotational moment is generated in the entire support member 10 by the vertical component of the transmitted vibration. It becomes easy to act. Thereby, a pressing force or a tensile force acts on the middle cross member 3 from the base end portion 11 of the support member 10.

  At this time, in the mounting structure of the support member 10 of the present embodiment, the base end portion 11 of the support member 10 is joined to the bottom surface 3d of the middle cross member 3 and the rear side surface 3e of the vertical flange 3a of the middle cross member 3. And the base end part 11 of the supporting member 10 is joined to two surfaces of different directions. Therefore, the pressing force or tensile force from the support member 10 to the middle cross member 3 acts in two different directions.

Accordingly, the middle cross member 3 is not easily deformed by the pressing force or tensile force from the support member 10, and the mounting rigidity and natural frequency of the support member 10 can be increased, so that the vibration of the support member 10 is reduced. In addition, resonance of the support member 10 with respect to vibration from the exhaust pipe 8 can be prevented. In this way, the vibration transmitted from the exhaust pipe 8 to the rear part 1 of the vehicle body can be reduced, so that the NV performance of the automobile can be improved.
Further, by joining the support member 10 to two surfaces in different directions, not only the rigidity and natural frequency are increased with respect to vertical vibration, but also the rigidity and natural frequency are determined with respect to vertical and horizontal vibration. Can be increased.

  Further, the base end portion 11 of the support member 10 includes a bottom surface 3d of the middle cross member 3 joined to an upper portion of the vertical wall portion 7a raised at the rear portion of the front floor panel 7, and a vertical flange 3a of the middle cross member 3. The exhaust pipe 8 is stably supported by a support member 10 which is joined to a corner portion of an L-shaped cross section formed by the rear side surface 3e of the first and second members and is firmly fixed at a high position from the ground surface. Thereby, it is not necessary to support the exhaust pipe 8 with the rear bottom surface 7c of the front floor panel 7, and the exhaust pipe 8 can be disposed close to the rear bottom surface 7c of the front floor panel 7. A sufficient clearance can be secured.

  In addition, since the exhaust pipe 8 is connected to the distal end portion 12 of the support member 10 via the elastic member 20, the vibration transmitted to the support member 10 is reduced by the vibration absorption effect of the elastic member 20, and the exhaust pipe 8 Vibration transmitted to the rear part 1 of the vehicle body is effectively reduced.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment. 4A and 4B are views showing another configuration of the support member mounting structure according to the present embodiment. FIG. 4A is a side sectional view of a configuration in which the support member is joined to the rear cross member, and FIG. FIG. 4C is a side sectional view of a configuration in which the support member is bonded to the bottom surface, the side surface, and the bottom surface of the horizontal flange of the middle cross member.

  For example, in the present embodiment, as shown in FIG. 3, the support member 10 joined to the middle cross member 3 has been described. However, the mounting location and the number of the support members 10 are not limited, and are attached to the bottom of the vehicle body. It is desirable to provide a plurality of support members 10 according to the shape and weight distribution of the exhaust system so that the exhaust system can be stably supported.

Here, as shown in FIG. 4A, a configuration in which the support member 10 is joined to the rear cross member 4 will be described.
The rear cross member 4 is a steel plate extending in the left-right direction of the rear part 1 of the vehicle body, and the front part is raised vertically. A horizontal flange 4a extends forward from the upper end of the front portion, and a vertical flange 4b extends downward from the rear end. Further, the upper surface 4 c of the horizontal flange 4 a and the rear side surface 4 d of the vertical flange 4 b are joined to the rear floor panel 5.
In the support member 10, the horizontal portion 10 a of the base end portion 11 is welded to the bottom surface 4 e of the rear cross member 4, and the vertical portion 10 b is welded to the front side surface 4 f of the vertical flange 4 b of the rear cross member 4.
In this configuration, similarly to the configuration of the present embodiment, the support member 10 is bonded to two surfaces in different directions, and the acting direction of the pressing force or tensile force from the support member 10 is distributed in two different directions. Therefore, the mounting rigidity and natural frequency of the support member 10 can be increased, and vibration transmitted from the exhaust pipe 8 to the vehicle body rear portion 1 can be reduced.

  In the present embodiment, as shown in FIG. 3, the support member 10 has the horizontal portion 10 a of the base end portion 11 welded to the bottom surface 3 d of the middle cross member 3, and the vertical portion 10 b of the base end portion 11 is middle cross. Although it is welded to the rear side surface 3e of the vertical flange 3a of the member 3, the support member 10 only needs to be joined to each surface in a different direction. For example, the vertical portion 10 b of the base end portion 11 may be joined to the rear side surface of the vertical wall portion 7 a of the front floor panel 7.

  Further, as shown in FIG. 4B, the horizontal portion 10a is joined to the bottom surface 3d of the middle cross member 3 without joining the vertical portion 10b of the base end portion 11 to the rear side surface 3e of the vertical flange 3a of the middle cross member 3. The base member 11 is welded to the bottom surface 3d and the rear side surface 3f of the middle cross member 3 so as to extend the support member 10 in two different directions. Can be joined.

  Furthermore, the support member 10 may be joined to a plurality of bottom surfaces and side surfaces, that is, three or more surfaces, and as shown in FIG. 4C, the horizontal portion 10 a at the base end portion 11 of the support member 10. Is formed to extend from the bottom surface 3d of the middle cross member 3 along the rear side surface 3f of the middle cross member 3 and the bottom surface 3g of the horizontal flange 3b of the middle cross member 3, and the base end portion 11 of the middle cross member 3 is formed. The bottom surface 3d, the rear side surface 3e, and the bottom surface 3g of the horizontal flange 3b may be joined. In this configuration, since the pressing force or tensile force acting on the middle cross member 3 from the support member 10 is effectively dispersed, the mounting rigidity and the natural frequency of the support member 10 can be further increased.

  In the present embodiment, the support member 10 is welded to the vehicle body rear portion 1, but the joining means is not limited, and the support member 10 is joined to the vehicle body rear portion 1 using a fixing means such as a bolt. May be.

It is the perspective view which looked at the principal part of the vehicle body rear part which applies the attachment structure of the support member in this embodiment from back. It is the perspective view which looked at the attachment structure of the support member in this embodiment from back. It is the sectional side view which showed the attachment structure of the supporting member in this embodiment. It is the figure which showed other structures of the attachment structure of the support member in this embodiment, (a) is a sectional side view of the structure where the support member was joined to the rear cross member, (b) is a support member being a middle cross member FIG. 4C is a side sectional view of a configuration in which the support member is bonded to the bottom surface, the side surface, and the bottom surface of the horizontal flange of the middle cross member. It is the sectional side view which showed the attachment structure of the conventional support member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Car body rear part 2 Rear side frame 3 Middle cross member 4 Rear cross member 8 Exhaust pipe 10 Support member 11 Base end part 12 Front end part 20 Elastic member

Claims (4)

An exhaust system support member mounting structure for mounting an exhaust system support member for supporting an exhaust system connected to a vehicle engine to a vehicle body of the vehicle,
A base end portion of the exhaust system support member is joined to a bottom surface and a side surface formed on a part of the vehicle body, and the exhaust system is connected to a distal end portion of the exhaust system support member. An exhaust system support member mounting structure.   2. The exhaust system support according to claim 1, wherein a base end portion of the exhaust system support member is configured by a rod bent to correspond to a bottom surface and a side surface formed in a part of the vehicle body. Member mounting structure.   The exhaust system support member mounting structure according to claim 1 or 2, wherein the exhaust system is connected to a distal end portion of the exhaust system support member via an elastic member. The vehicle body includes a floor panel, and a cross member joined to a rising portion of the floor panel,
The bottom surface is a bottom surface of the cross member;
By extending the side surface downward from the bottom surface, a corner of an L-shaped cross section is formed,
The exhaust system support member mounting structure according to any one of claims 1 to 3, wherein a base end portion of the exhaust system support member is joined to a bottom surface and a side surface of the corner portion. .

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