JP6650766B2 - Exhaust system support structure for vehicles - Google Patents

Description

  The present invention relates to an exhaust system support structure for a vehicle.

An exhaust system such as an exhaust pipe and a silencer is attached below the vehicle body bottom.
Further, in order to attach such an exhaust system to the bottom of the vehicle body, a rod-shaped support rod has been conventionally used.
The support rod extends in the horizontal direction, and penetrates a connecting member joined to the outer surface of the exhaust pipe or the like to support the exhaust pipe or the like.

In the following Patent Document, a plate-like mounting bracket extending in a vertical direction is provided to mount a support rod on the bottom of a vehicle body.
The mounting bracket is formed with a hole penetrating in the horizontal direction, and the base end side of the support rod is inserted into the hole.
The peripheral edge of the hole is welded to the support rod, and the support rod and the mounting bracket are joined by the weld.

Japanese Patent No. 4403839

  However, in the above-described exhaust system support structure, when the support rod vibrates up and down due to the vibration of the exhaust pipe or the like, the stress tends to concentrate on the peripheral edge of the hole, which may cause a problem in the welded portion.

  The present invention has been made in view of the above background, and provides an exhaust system support structure for a vehicle that can improve the durability of a welded portion that joins a support rod and a mounting bracket. That is the task.

  As means for solving the above problems, an exhaust system support structure for a vehicle according to the present invention includes a support rod for supporting an exhaust system, and a mounting bracket for attaching the support rod to a vehicle body bottom portion, The vehicle body bottom portion includes a floor panel, and a closed-section frame coupled below the floor panel to form a first closed section with the floor panel, and the mounting bracket extends vertically downward from the closed-section frame. A vertical piece forming a second closed cross section below the first closed cross section, the support rod extends vertically along a vertical plane formed in the vertical piece, and the support rod has a vertical section formed by welding. A vertical rod portion joined to a surface, and a horizontal rod portion extending horizontally from a lower end of the vertical rod portion and supporting the exhaust system.

According to the invention, since the vertical rod portion of the support rod is joined along the vertical surface of the mounting bracket, the load (vibration) in the vertical direction of the support rod is not concentrated on a part of the vertical surface but the entire vertical surface. , In other words, the input is distributed in the vertical direction. For this reason, the durability of the welded portion can be improved.
Further, since the vertical piece extends downward from the closed section frame in the vertical direction, when a vertical load (vibration) is input to the vertical plane (vertical piece), the vertical piece forms the first closed section. It is supported by a rigid rigid section frame. Therefore, the vibration frequency of the vertical piece increases.
In addition, since the vertical piece forms the second closed section, the rigidity is high and the vibration frequency is further increased.
From the above, it is difficult for the vertical piece to resonate with the exhaust system having a low vibration frequency.

  Further, in the invention, the mounting bracket includes a substantially L-shaped first piece and a substantially L-shaped second piece, and the first piece has an upper end joined to the closed-section frame. The vertical piece, and a flange piece extending horizontally from the lower end of the vertical piece, the second piece extends in the horizontal direction, one end is joined to the flange piece, a horizontal piece, And an extension piece extending downward from one end of the horizontal piece and extending the vertical plane downward.

According to the above configuration, since the vertical surface is extended by the extension pieces, the vertical load (vibration) input to the vertical surface is further dispersed in the vertical direction. For this reason, the durability of the welded portion is further improved.
Further, according to the extension piece, the vicinity of the exhaust system as the vibration source is supported, and the support strength for supporting the support rod is increased. Therefore, the vibration frequency transmitted from the support rod to the vertical piece and the extension piece increases, and the vertical piece and the extension piece are more difficult to resonate with the exhaust system.

  Further, in the invention, a pair of protrusions protruding toward the support rod are formed on both sides of the vertical surface provided on the vertical piece and the extension piece, and the vertical surface is formed by the pair of protrusions. Preferably, the groove surface is formed between them.

  According to the above configuration, since the vertical surface is the groove surface, the connection between the vertical surface and the support rod by welding is strengthened, and the rigidity of the vertical piece and the extension piece constituting the vertical surface is increased. For this reason, the vibration frequency of the vertical piece and the extension piece is increased, and it is difficult to resonate with the exhaust system.

  Further, in the invention, the floor panel includes a front floor panel and a rear floor panel, wherein the rear floor panel is overlapped and coupled to an upper surface of a rear end of the front floor panel; A first vertical wall portion extending upward from a rear end of the overlapping portion, and a first horizontal wall portion extending rearward from an upper edge of the first vertical wall portion; A cross member, wherein the middle cross member includes a second vertical wall portion extending downward from a lower surface of the first horizontal wall portion, and a second horizontal wall portion extending forward from a lower end of the second vertical wall portion. The first vertical wall portion, the first horizontal wall portion, the second vertical wall portion, and the second horizontal wall portion form the first closed cross section, and the upper end of the vertical piece has the 2 joined to the vertical wall, and the second horizontal wall is An extension piece extending toward the lower surface and joined to the second horizontal wall is provided, and the other end of the horizontal piece is sandwiched between a rear end of the front floor panel and an overlapping part of the rear floor panel. It is preferable that they are combined in a disconnected state.

According to the above configuration, when a vertical load (vibration) is input to the vertical plane, it is mainly supported by the second vertical wall portion joined to the upper end of the vertical piece and the second horizontal wall portion joined to the extension portion. Will be done.
Therefore, the mounting bracket is less likely to vibrate vertically.
Further, since the other end of the horizontal piece is connected, when a load in the horizontal direction or the vertical direction is input to the vertical plane, the horizontal piece is supported by the front floor panel or the like via the horizontal piece. Therefore, it is difficult for the mounting bracket to vibrate horizontally or rotate around the vertical direction.

  In the invention described above, each end of the middle cross member in the vehicle width direction is coupled to left and right side sills, the middle cross member extends from a front end of the second horizontal wall, and a rear end of the front floor panel A clip connecting portion that is connected in a state of being sandwiched between the portion and the overlapping portion of the rear floor panel, a cutout is provided in a part of the clip connecting portion, and the other end of the horizontal piece Preferably, it passes through the notch and is sandwiched between a rear end of the front floor panel and an overlapping portion of the rear floor panel.

  According to the above configuration, the other end of the horizontal piece can be coupled between the front floor panel and the rear floor panel. In addition, since the ridge formed between the corners of the second horizontal wall and the second vertical wall is not cut off, the strength of the middle cross member in the vehicle width direction is not impaired. Further, the weight of the vehicle can be reduced by the notch.

  In the invention, the horizontal piece is formed with a horizontal piece protrusion that extends in a direction in which the horizontal piece extends, and the extension piece is a portion between the pair of protrusions, It is preferable that a relative protrusion protruding on the side opposite to the vertical plane is formed, and the horizontal piece protrusion is continuous with the relative protrusion.

  According to the configuration, the tension and the compressive strength of the horizontal piece are improved, and the mounting bracket is less likely to vibrate in the horizontal direction.

  Further, in the invention, an upper end projection is formed at an upper end of the vertical piece, and a lower side of the upper end projection is bifurcated and continuous with each of the pair of projections. Is preferred.

  According to the configuration, the vertical piece (vertical direction) tension and compressive strength of the vertical piece are improved, and the mounting bracket is more difficult to vibrate in the vertical direction.

  Further, in the above invention, a rear end support rod for supporting a rear end of the exhaust system is further provided, and the rear end support rod is attached to an end plate of a rear side frame and faces outward in the vehicle width direction. It preferably extends.

According to the above configuration, the rear end supporting rod is supported by the highly rigid end plate, so that the exhaust system is less likely to vibrate.
In addition, since the rear end support rod extends outward from the end plate of the rear side frame in the vehicle width direction, the supported exhaust system is located rearward on the outside in the vehicle width direction. Therefore, it is difficult for the vibration (noise) of the exhaust system to be transmitted inside the vehicle.

  ADVANTAGE OF THE INVENTION According to this invention, the exhaust-system support structure for vehicles which can aim at the durability improvement of the welding part which joins a support rod and a mounting bracket can be provided.

It is the bottom view which looked at the rear part side of the body bottom of an embodiment from the lower part. FIG. 5 is a perspective view of a front exhaust system support member as seen from the rear. FIG. 3 is an enlarged perspective view in which a front exhaust system support member illustrated in FIG. 2 is enlarged. FIG. 4 is a sectional view taken along line IV-IV in FIG. 1. FIG. 5 is a sectional view taken along line VV of FIG. 4. FIG. 6 is a sectional view taken along line VI-VI in FIG. 4. FIG. 7 is a sectional view taken along line VII-VII of FIG. 2. It is the perspective view which looked at the mounting bracket from the front and the lower left side. It is the perspective view which looked at the right main silencer from the back and the upper right side.

Next, a vehicle to which the vehicle exhaust system support structure according to the embodiment is applied will be described with reference to the drawings.
In the following description, the “vertical direction” includes a direction that can be regarded as equivalent to the up-down direction from the viewpoint of the operation effect, although the up-down direction of the vehicle does not exactly match the up-down direction of the vehicle.
The “horizontal direction” also includes a vertical direction perpendicular to the vertical direction of the vehicle, and a direction that is not strictly coincident with the vertical direction, but can be regarded as equivalent to the vertical direction from the viewpoint of the effect. .
First, the exhaust system 70 mounted on the vehicle will be described.

(Exhaust system 70)
FIG. 1 is a bottom view of the rear side of the vehicle body bottom 50 as viewed from below.
As shown in FIG. 1, an exhaust system 70 is connected to each cylinder of an engine (not shown) to collect exhaust gas (not shown), and an exhaust system for exhausting the exhaust gas collected by the exhaust manifold to the rear of the vehicle. An exhaust pipe 71, a catalytic converter (not shown) for removing harmful components of exhaust gas by a catalytic reaction, and a sub-silencer 72 and a main silencer 73 for reducing noise due to exhaust gas are provided.

The exhaust pipe 71 is a long component formed by connecting a plurality of tubular members (exhaust pipes).
Although not particularly shown, the front part of the exhaust pipe 71 is disposed in the engine room, and the front end of the exhaust pipe 71 is connected to the exhaust manifold.

As shown in FIG. 1, an intermediate portion 71a and a rear portion 71b of the exhaust pipe 71 are arranged below the vehicle body bottom 50.
The intermediate portion 71a of the exhaust pipe 71 is attached to the center of the vehicle body bottom 50 in the vehicle width direction by the exhaust system support structure 1 (see FIG. 2). Note that a sub-silencer 72 is provided in an intermediate portion 71 a of the exhaust pipe 71.

A rear portion 71b of the exhaust pipe 71 branches outward in the vehicle width direction, and main silencers 73, 73 are provided at each rear end.
Each main silencer 73 is attached to the vehicle width direction outside of the vehicle body bottom 50 by the exhaust system support structure 1 (see FIG. 9).
Further, a rear end portion 71c of the exhaust pipe 71 is provided from the rear surface of the main silencer 73 to the rear.

(Exhaust system support structure 1)
As shown in FIGS. 2 and 9, the exhaust system support structure 1 includes a front exhaust system support member 2 for supporting an intermediate portion of the exhaust system 70 (an intermediate portion 71 a of the exhaust pipe 71), and a rear portion of the exhaust system 70. And a rear exhaust system support member 3 for supporting the end (main silencer 73).
The front exhaust system support member 2 and the rear exhaust system support member 3 support the exhaust system 70 using the rod-shaped support rod 4.

Here, as shown in FIGS. 2 and 3, the support rod 4 does not directly support the exhaust system 70 (the exhaust pipe 71), but supports the supported member 80 provided on the outer peripheral surface of the exhaust system 70. By doing so, the exhaust system 70 is indirectly supported.
The supported member 80 is connected to a flange 81 provided on the outer peripheral surface of the exhaust pipe 71, a pair of pipe stays 82, 82 having one end connected to the flange 81, and the other end of the pair of pipe stays 82, 82. And a connecting portion 83 to be connected.
The exhaust system 70 (exhaust pipe 71) is attached to the vehicle body bottom 50 in a suspended state by the support rod 4 penetrating the connecting portion 83 and supporting the connecting portion 83.
Next, the basic configuration of the front exhaust system support member 2 will be described.

(Front exhaust system support member 2)
The front exhaust system support member 2 includes a support rod 4 that supports the exhaust pipe 71 (exhaust system 70), and a mounting bracket 5 for mounting the support rod 4 to the vehicle body bottom 50.
As shown in FIG. 4, the vehicle body bottom 50 has a closed-section frame 8 joined to floor panels (a front floor panel 51 and a rear floor panel 52). Further, the floor panel and the closed section frame 8 form a first closed section S1.

The mounting bracket 5 is joined below the vehicle body bottom 50 to form a second closed section S2 below the first closed section S1.
The mounting bracket 5 includes a vertical piece 11 extending vertically downward from the closed-section frame 8 and constituting a second closed section S2.

The support rod 4 is an L-shaped rod 4A having an L-shape.
The L-shaped rod 4A extends in the vertical direction (vertical direction) along the vertical surface 14 formed on the rear surface 11a of the vertical piece 11, and is connected to the vertical surface 14 by a weld (not shown); A horizontal bar 7 extending in the horizontal direction (forward) from the lower end of the vertical bar 6 and supporting the connecting portion 83 (the exhaust system 70).
Although not particularly shown, the welded portion is formed by melting a metal material by welding (MIG welding) and then hardening the metal material. A plurality of the welded portions are formed in the vertical direction (vertical direction) along the vertical rod portion 6 and the vertical surface 14. Is formed.

According to the front exhaust system support member 2 described above, when the L-shaped rod 4A vibrates in the vertical direction due to the vibration of the exhaust pipe 71, the vertical load (in the vertical plane 14) to which the vertical rod portion 6 of the L-shaped rod 4A is joined is applied. Vibration) is input.
Here, since the vertical surface 14 extends in the vertical direction, the load (vibration) in the vertical direction is dispersed over the entire vertical surface 14 without being concentrated on a part of the vertical surface 14, in other words, Enter the data dispersed in the vertical direction. Therefore, the durability of the welded portion can be improved.

Further, when a vertical load (vibration) is input to the vertical surface 14 and the vertical piece 11 vibrates in the vertical direction, the vertical piece 11 is supported by the highly rigid closed-section frame 8. Therefore, the vibration frequency of the vertical piece 11 increases.
Further, since the vertical piece 11 forms the second closed section S2, the strength of the vertical piece 11 itself is high, and the vibration frequency of the vertical piece 11 is further increased.
From the above, it is difficult for the vertical piece 11 to resonate with the exhaust system 70 having a low vibration frequency.

  Next, the specific configuration of the front exhaust system support member 2 (the vehicle body bottom 50, the L-shaped rod 4A, and the mounting bracket 5) will be described in detail.

(Body bottom 50)
As shown in FIG. 1, a vehicle body bottom 50 includes a front floor panel 51 forming a bottom wall of a vehicle compartment, a rear floor panel 52 disposed behind the front floor panel 51 and forming a bottom wall of a luggage compartment, and a front floor panel. Left and right side sills 53, 53 extending in the front-rear direction at left and right ends of the left and right sides 51, and left and right floor frames 54, 54 extending in the vehicle width direction inside the left and right side sills 53, 53 in the front-rear direction; A middle cross member 60 extending in the vehicle width direction and having each end coupled to the left and right side sills 53, left and right rear side frames 55, 55 extending rearward from each end of the middle cross member 60 in the vehicle width direction; Is provided.
The front exhaust system support member 2 is provided at the center of the vehicle body bottom 50 in the vehicle width direction, and is provided at the boundary between the front floor panel 51 where the middle cross member 60 is disposed and the rear floor panel 52.

(Rear floor panel 52)
As shown in FIG. 4, the rear floor panel 52 includes an overlapping portion 52 a that is overlapped and joined to the upper surface of a rear end portion 51 a of the front floor panel 51, and a first vertical wall extending upward from the rear end of the overlapping portion 52 a. And a first horizontal wall portion 52c extending rearward from an upper edge of the first vertical wall portion 52b.
Therefore, a step is formed on the lower surface of the vehicle body bottom portion 50 at the boundary between the front floor panel 51 and the rear floor panel 52, and the rear side (the rear floor panel 52) is higher than the front side (the front floor panel 51).

(Middle cross member 60)
The middle cross member 60 is the closed-section frame 8 described above.
As shown in FIG. 4, the middle cross member 60 includes an upper joint 61 joined to the lower surface of the first horizontal wall 52c of the rear floor panel 52 and a front end of the upper joint 61 (the lower surface of the first horizontal wall 52c). Vertical wall portion 62 extending downward from the second vertical wall portion 62, a second horizontal wall portion 63 extending forward from the lower end of the second vertical wall portion 62, and a lower joint extending downward from the front end of the second horizontal wall portion 63 64, and a sandwich connecting portion 65 (see FIGS. 2, 3, and 7) that is continuous with the ends of the second horizontal wall portion 63 and the lower joining portion 64.
Further, the first closed section S1 described above is formed by the first vertical wall portion 52b, the first horizontal wall portion 52c, the second vertical wall portion 62, and the second horizontal wall portion 63.

As shown in FIG. 2, a ridgeline L1 extending in the vehicle width direction is formed at a corner formed by the second horizontal wall portion 63 and the second vertical wall portion 62.
Further, each end of the second vertical wall portion 62 and the second horizontal wall portion 63 in the vehicle width direction is connected to left and right side sills 53, and the ridge line L1 extends to the left and right side sills 53, 53. (See broken line L1 'in FIG. 2). For this reason, the middle cross member 60 has sufficient strength against side collision.
The second horizontal wall 63 has a flat shape at each end in the vehicle width direction, and a central portion in the vehicle width direction is depressed upward.

The lower joining portion 64 is a wall portion extending downward from the center portion of the second horizontal wall portion 63 in the vehicle width direction and continuing to the rear end of the sandwiching coupling portion 65, and has a substantially trapezoidal shape when viewed from the rear. I have.
Further, the lower joint portion 64 extends along the first vertical wall portion 52b of the rear floor panel 52, and is joined to the first vertical wall portion 52b by welding (see FIG. 4).

As shown in FIG. 2 and FIG. 3, each end of the sandwiching coupling portion 65 in the vehicle width direction is continuous with the front end of the second horizontal wall portion 63, and the center portion in the vehicle width direction is at the lower end of the lower joint portion 64. It is continuous.
As shown in FIG. 7, the sandwiching coupling portion 65 is sandwiched between the rear end portion 51a of the front floor panel 51 and the overlapping portion 52a of the rear floor panel 52, and is coupled to the front floor panel 51 and the rear floor panel 52 by welding. are doing.

As shown in FIGS. 2 and 3, a notch S <b> 3 is provided in the sandwiching coupling portion 65 to expose a coupling portion between the front floor panel 51 and the rear floor panel 52.
The notch S3 is formed in the vicinity of the center in the vehicle width direction and at a position where the front exhaust system support member 2 is provided.
For this reason, as shown in FIG. 4, a part of the mounting bracket 5 (a horizontal piece 21 described later) can be joined between the front floor panel 51 and the rear floor panel 52.

As shown in FIG. 3, the notch S3 also has a notch at the lower end side of the lower joint portion 64, so that the joint between the front floor panel 51 and the rear floor panel 52 is reliably exposed from the notch S3. It has become.
Note that the notch S3 is formed by cutting out only the sandwiching connection portion 65 and the lower joining portion 64, and is not cutting out the ridge line L1. Therefore, the strength of the middle cross member 60 in the vehicle width direction is not impaired, and the weight of the vehicle can be reduced.

(L-shaped rod 4A)
As shown in FIG. 4, the L-shaped rod 4A is formed by bending a cylindrical metal member. The horizontal bar 7 includes a small diameter portion 7a and a retaining portion 7b.
The small diameter portion 7a is a portion that supports the connecting portion 83 and has a smaller diameter than other portions. According to the small-diameter portion 7a, steps are formed at the front and rear edges of the small-diameter portion 7a, and the connecting portion 83 is locked to the step, making it difficult for the displacement to occur, and making the exhaust pipe 71 hard to vibrate.
The retaining portion 7b is a large-diameter portion provided on the front end side (front end side) of the small-diameter portion 7a. According to this, it is possible to prevent the connecting portion 83 from falling off from the horizontal bar 7.

(Mounting bracket 5)
The mounting bracket 5 is a member formed in a substantially L shape in a side view.
One end of the mounting bracket 5 is joined to the middle cross member 60 and the other end is joined to the floor panel (the front floor panel 51 and the rear floor panel 52) to form a second closed section S2.
The mounting bracket 5 includes a first piece 10 that forms one side of the above-described L-shape, and a second piece 20 that forms the other side of the above-described L-shape.
Each of the first piece 10 and the second piece 20 is a metal piece formed in a substantially L shape in a side view, and is formed by press working.
Hereinafter, the details of the first piece 10 and the second piece 20 will be described.

(First piece 10)
The first piece 10 includes the above-described vertical piece 11 extending downward from the second vertical wall portion 62 of the middle cross member 60 in the vertical direction, the flange piece 12 extending horizontally and forward from the lower end of the vertical piece 11, A pair of extending pieces 13 extending from each side of the vertical piece 11 toward the lower surface of the second horizontal wall 63.

The above-described vertical surface 14 to which the vertical rod portion 6 of the L-shaped rod 4A is joined is formed in a vertical intermediate portion of the rear surface 11a of the vertical piece 11.
As shown in FIG. 3, a pair of first protrusions 15, 15 protruding toward the vertical rod 6 are formed on both left and right sides of the vertical surface 14.
For this reason, the vertical surface 14 is formed between the pair of first projecting portions 15, 15 to form a concave groove surface, and joins the vertical surface 14 and the vertical rod portion 6 by welding (MIG welding). Can be robust. As a result, the rigidity of the vertical piece 11 constituting the vertical surface 14 increases, and the vibration frequency of the vertical piece 11 increases.

As shown in FIGS. 4 and 5, the upper end 11 b of the vertical piece 11 is joined to the rear surface of the second vertical wall portion 62 of the middle cross member 60 by welding.
An upper end protruding portion 16 protruding toward the rear surface 11a is formed at the center of the upper end 11b of the vertical piece 11 in the vehicle width direction.

As shown in FIG. 3, the lower side of the upper end protruding portion 16 is bifurcated and is continuous with each of the pair of first protruding portions 15.
According to this, the tension and the compressive strength of the portion between the upper end portion 11b and the vertical surface 14, in other words, the portion where the vertical stress acts when a vertical load (vibration) is input to the vertical surface 14 Is improved. Therefore, the vibration frequency of the vertical piece 11 increases.

As shown in FIG. 4, the pair of extending pieces 13, 13 are on both sides of the vertical piece 11 and extend upward from the middle in the vertical direction toward the front upper side. A joining flange 13 a extending outward in the vehicle width direction is formed at the upper ends of the pair of extending pieces 13, 13 and is joined to the lower surface of the second horizontal wall 63.
According to this, when a vertical load (vibration) is input to the vertical surface 14, in addition to the second vertical wall portion 62 of the middle cross member 60 to which the upper end portion 11 b of the vertical piece 11 is joined, a pair of extension members is provided. The pieces 13 are also supported by the second horizontal wall 63 to which the pieces 13 are joined. Therefore, the vibration frequency of the vertical piece 11 increases.

(Second piece 20)
The second piece 20 extends in the horizontal direction, and has a rear end 21 a (one end) joined to the flange piece 12 of the first piece 10, and a lower end from the rear end (one end) of the horizontal piece 21. An extension piece 22 that extends.

The front end 21b (the other end) of the horizontal piece 21 is sandwiched and connected between the rear end 51a of the front floor panel 51 and the overlapping portion 52a of the rear floor panel 52.
Thus, the horizontal piece 21 forms the second closed cross section S2 by the vertical piece 11, the first vertical wall portion 52b of the rear floor panel 52, and the second horizontal wall portion 63 of the middle cross member 60.
Then, when a load in a horizontal direction or a direction around the vertical direction is input to the vertical surface 14, the vertical piece 11 is supported by the joint between the front floor panel 51 and the rear floor panel 52 via the horizontal piece 21. become. Therefore, even if a load in the horizontal direction or the vertical direction is input to the vertical surface 14, the vertical piece 11 is hard to vibrate in the horizontal direction or rotate around the vertical direction. The front end 21b of the horizontal piece 21 is sandwiched between the front floor panel 51 and the rear floor panel 52 by passing through the above-described notch S3 of the middle cross member 60.

As shown in FIG. 8, a horizontal piece projection 26 that is recessed upward is formed at the center of the horizontal piece 21 in the vehicle width direction. The protrusion 26 for the horizontal piece extends in the front-rear direction, and the tension and compressive strength of the horizontal piece 21 in the front-rear direction are improved.
The flange piece 12 of the first piece 10 joined above the horizontal piece 21 has a recess 12a corresponding to the horizontal piece protrusion 26 (see FIG. 6).

As shown in FIG. 4, the extension piece 22 is for extending a portion of the L-shaped rod 4 </ b> A to be joined to the vertical rod portion 6 downward, and extends the extension vertical surface 24 to be joined to the vertical rod portion 6. Have. As a result, the load input from the L-shaped rod 4A is input not only to the vertical surface 14 but also to the extended vertical surface 24, and the vertical load (vibration) is dispersed. For this reason, the durability of the welded portion is further improved.
The portion supported by the extension piece 22 is below the vertical surface 14 of the vertical piece 11 and is near the exhaust pipe 71 that is a vibration source. Therefore, the supporting strength for supporting the L-shaped rod 4A is improved, and the vibration frequency transmitted from the L-shaped rod 4A to the vertical piece 11 and the extension piece 22 is increased.

As shown in FIG. 3, the extension piece 22 is formed with a pair of second projecting portions 23 projecting rearward.
The extended vertical surface 24 is formed between the pair of second protruding portions 23 (the rear surface of the relative protruding portion 25) and has a concave groove surface. For this reason, the joining of the extension vertical surface 24 and the vertical rod portion 6 by welding (MIG welding) becomes strong, and the vibration frequency of the extension piece 22 can be further increased.

As shown in FIG. 8, a relative protruding portion 25 that protrudes relatively forward is formed between the pair of second protruding portions 23 on the front surface of the extension piece 22.
The relative protruding portion 25 is continuous with the horizontal piece protruding portion 26, and the tension and compressive strength of the horizontal piece 21 are further improved.

Next, the rear exhaust system support member 3 will be described.
As shown in FIG. 9, the rear exhaust system support member 3 includes a rear end support rod 4 </ b> B for supporting a main silencer 73 provided on a rear end side of the exhaust system 70.

The rear end support rod 4B is supported by an end plate 9 joined to the rear end of the rear side frame 55.
The rear end support rod 4 </ b> B is supported by the end plate 9 and extends outward in the vehicle width direction. A lower extension rod 41 extends downward from the outside of the proximal end 40 in the vehicle width direction. And a front extension portion 42 extending forward and horizontally from the lower end of the lower extension rod portion 41 to support the connecting portion 83.
At the upper end of the end plate 9 on the outer side in the vehicle width direction, a support portion 9a formed by bending into a substantially U-shape is formed, and the support portion 9a supports the rear end support rod 4B. ing.

According to the rear exhaust system support member 3 described above, since the rear end support rod 4B is supported by the highly rigid end plate 9, the main silencer 73 can be made hard to vibrate.
Further, the main silencer 73 supported by the rear end support rod 4B is located outside the vehicle width direction and near the rear end of the vehicle. For this reason, the vibration (noise) of the main silencer 73 is hardly transmitted to the inside of the vehicle, and silence can be ensured.

The embodiment has been described above, but the present invention is not limited to this.
The vertical piece 11 of the mounting bracket 5 of the embodiment is connected to the middle cross member 60, but may be a frame that forms a closed cross section such as a rear cross member provided on the vehicle body bottom 50.
Further, in the embodiment, the front end 21b of the horizontal piece 21 of the mounting bracket 5 is sandwiched and connected between the front floor panel 51 and the rear floor panel 52. However, if the front end 21b of the horizontal piece 21 can be fixed. Alternatively, another fixing method may be used.

Reference Signs List 1 exhaust system support structure 4 support rod (4A L-shaped rod 4B support rod for rear end)
5 Mounting Bracket 6 Vertical Bar 7 Horizontal Bar 9 End Plate 10 First Piece 11 Vertical Piece 12 Flange Piece 13,13 Extension Piece 14 Vertical Surface 15,15 First Projection (Projection)
16 Projection for upper end 20 Second piece 21 Horizontal piece 22 Extension piece 23, 23 Second projection (projection)
24 Extended vertical surface 26 Projection for horizontal piece 50 Body bottom 51 Front floor panel (floor panel)
52 Rear floor panel (floor panel)
60 Middle Cross Member (8 Closed Section Frame)
62 second vertical wall portion 63 second horizontal wall portion 65 sandwiching connection portion 70 exhaust system 71 exhaust pipe L1 ridge line S1 first closed section S2 second closed section S3 notch

Claims (7)

A support rod for supporting an exhaust system, and a mounting bracket for mounting the support rod to a vehicle body bottom portion,
The vehicle body bottom portion includes: a floor panel; and a closed-section frame coupled below the floor panel to form a first closed section with the floor panel.
The mounting bracket includes a vertical piece that extends vertically downward from the closed-section frame and forms a second closed section below the first closed section.
The support rod is
A vertical rod portion extending in a vertical direction along a vertical surface formed on the vertical piece, and joined to the vertical surface by a welded portion;
A horizontal bar that extends horizontally from the lower end of the vertical bar and supports the exhaust system,
The mounting bracket includes an L-shaped first piece and an L-shaped second piece,
The first piece is
The vertical piece whose upper end is joined to the closed-section frame,
A flange piece extending horizontally from the lower end of the vertical piece,
The second piece is
A horizontal piece extending in the horizontal direction and having one end joined to the flange piece;
An extension piece extending downward from one end of the horizontal piece and extending the vertical plane downward,
The extension piece is joined to the vertical rod portion,
The exhaust system support structure for a vehicle, wherein the second closed section is formed so as to be surrounded by at least the floor panel, the closed section frame, the vertical piece, and the horizontal piece. On both sides of the vertical plane provided on the vertical piece and the extension piece, a pair of protrusions projecting toward the support rod side are formed,
The exhaust system support structure for a vehicle according to claim 1, wherein the vertical plane is a groove surface formed between the pair of protrusions. The floor panel includes a front floor panel and a rear floor panel,
The rear floor panel,
An overlapping portion which is overlapped and joined to the upper surface of the rear end of the front floor panel,
A first vertical wall portion extending upward from a rear end of the overlapping portion;
A first horizontal wall portion extending rearward from an upper edge of the first vertical wall portion,
The closed-section frame is a middle cross member,
The middle cross member,
A second vertical wall portion extending downward from a lower surface of the first horizontal wall portion;
A second horizontal wall extending forward from a lower end of the second vertical wall,
The first vertical wall portion, the first horizontal wall portion, the second vertical wall portion, and the second horizontal wall portion form the first closed section;
The upper end of the vertical piece is joined to the second vertical wall,
On the side of the vertical piece, an extension piece extending toward the lower surface of the second horizontal wall and joining to the second horizontal wall is provided,
3. The vehicle according to claim 2, wherein the other end of the horizontal piece is connected to a rear end of the front floor panel and sandwiched between an overlapping portion of the rear floor panel. 4. Exhaust system support structure. Each end of the middle cross member in the vehicle width direction is connected to left and right side sills,
The middle cross member,
A pinch coupling portion extending from a front end of the second horizontal wall portion and coupled with a rear end portion of the front floor panel and a laminated portion of the rear floor panel,
A cutout is provided in a part of the pinch joint,
The other end of the horizontal piece passes through the notch, and is sandwiched between a rear end of the front floor panel and an overlapping portion of the rear floor panel. Exhaust system support structure for vehicles. The horizontal piece is formed with a horizontal piece protrusion extending in a direction in which the horizontal piece extends,
In the extension piece, a relative protrusion is formed between the pair of protrusions and protrudes in a direction opposite to the vertical plane,
The exhaust system support structure for a vehicle according to claim 4, wherein the horizontal piece projection is continuous with the relative projection. An upper end protrusion is formed at the upper end of the vertical piece,
The exhaust system supporting structure for a vehicle according to claim 4 or 5, wherein a lower side of the upper end projection is bifurcated and connected to each of the pair of projections. Further comprising a rear end support rod for supporting a rear end of the exhaust system,
The vehicle according to any one of claims 1 to 6, wherein the rear end support rod is attached to an end plate of a rear side frame and extends outward in the vehicle width direction. Exhaust system support structure.

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