CN106988849B - Vehicle exhaust system supporting structure - Google Patents

Abstract

The invention provides a vehicle exhaust system support structure, which comprises: a support rod (4) supporting the exhaust system and a mounting bracket (5) for mounting the support rod (4) on the bottom of the vehicle body , the bottom of the vehicle body is equipped with a floor and a closed section frame that is combined with the lower side of the floor to form a first closed section (S1) with the floor, and the mounting bracket (5) has a vertically lower side extending from the closed section frame (8). The vertical piece (11) of the 2nd closed section S2 is formed below the 1st closed section (S1), and the supporting rod (4) is equipped with: a vertical rod portion (6), which is formed along the vertical piece (11) of the vertical piece (4). The straight surface (11a) extends vertically and is combined with the vertical surface (11a) through a welding part; and the horizontal rod part (7) extends horizontally from the lower end of the vertical rod part (6) to support the exhaust system. According to this, the durability of the welding portion for joining the support rod and the mounting bracket can be improved.

Description

Vehicle Exhaust System Support Structure

technical field

The invention relates to a vehicle exhaust system supporting structure.

Background technique

An exhaust system such as an exhaust pipe and a silencer is installed on the underside of the vehicle body.

In addition, in order to attach such an exhaust system to the underbody of the vehicle body, rod-shaped support rods have been used conventionally.

The support rod extends in the horizontal direction, and penetrates through a link joined to the outer surface of the exhaust pipe or the like to support the exhaust pipe or the like.

In the following patent documents, a plate-shaped mounting bracket extending in the vertical direction is provided in order to mount the support rod to the vehicle underbody.

In addition, a hole penetrating in the horizontal direction is formed in the mounting bracket, and the base end side of the support rod is inserted into the hole.

In addition, the peripheral end edge of the hole is welded to the support rod, and the support rod and the mounting bracket are joined to each other through the welded portion.

prior art literature

patent documents

Patent Document 1: Japanese Invention Patent Grant Gazette Patent No. 4403839

However, in the exhaust system support structure described above, when the support rod vibrates in the vertical direction due to the vibration of the exhaust pipe, etc., the stress tends to concentrate on the peripheral edge of the hole, which may cause problems in the welded part.

Contents of the invention

Therefore, the present invention has been made in view of the above background, and an object of the present invention is to provide a vehicle exhaust system support structure capable of improving the durability of a welded part for joining a support bar and a mounting bracket.

As means for solving the above-mentioned problems, a vehicle exhaust system support structure according to the present invention includes: a support bar for supporting the exhaust system; (floor panel); and a closed section frame, which is combined with the underside of the floor and forms a first closed section together with the floor, and the mounting bracket is provided with a vertical piece extending from the closed section The frame extends to the lower side in the vertical direction and forms a second closed section below the first closed section, and the support rod includes: a vertical bar portion that is formed vertically along the vertical surface formed on the vertical piece. extending in a direction and joined to the vertical surface by a welding portion; and a horizontal bar portion extending in a horizontal direction from a lower end of the vertical bar portion to support the exhaust system.

According to the present invention, since the vertical bar 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 is dispersed to the entire vertical surface, In other words, it is applied so as to disperse in the vertical direction. Therefore, the durability of the welded portion can be improved.

In addition, since the vertical piece extends from the frame of the closed section to the lower side in the vertical direction, when a load (vibration) in the vertical direction is applied to the vertical surface (vertical piece), the vertical piece constitutes the first closed section. The closed section frame support with high rigidity. Therefore, the vibration frequency of the vertical piece increases.

In addition, since the vertical piece forms the second closed section, the rigidity is further improved, and the vibration frequency is further increased.

To sum up, the vertical piece is not easy to resonate with the exhaust system with low vibration frequency.

In the present invention, it is preferable that the mounting bracket includes a substantially L-shaped first piece and a substantially L-shaped second piece, and the first piece includes: the vertical piece, the upper end of which is joined to the closure a cross-sectional frame; and a flange piece extending horizontally from a lower end of the vertical piece, and the second piece includes: a horizontal piece extending horizontally and having one end joined to the flange piece; and The extension piece extends downward from one end of the horizontal piece and extends the vertical surface downward.

According to the above configuration, since the vertical surface is extended by the extension piece, the vertical load (vibration) applied to the vertical surface is further dispersed in the vertical direction. Therefore, the durability of the welded portion can be further improved.

In addition, if the extension piece is used, the vicinity of the exhaust system, which is a vibration source, can be supported, and the support strength for the support rod can be improved. Therefore, the vibration frequency transmitted from the support rod to the vertical piece and the extension piece is increased, and the vertical piece and the extension piece are less likely to resonate with the exhaust system.

In addition, in the present invention, it is preferable that a pair of protrusions protruding toward the support rod side are formed on both sides of the vertical surface provided on the vertical piece and the extension piece, and the vertical surface is formed to on the groove surface between the pair of protrusions.

According to the above configuration, since the vertical surface becomes the groove surface, the joint between the vertical surface and the support bar by welding becomes firm, and the rigidity of the vertical piece and the extension piece constituting the vertical surface is improved. Therefore, the vibration frequency of the vertical piece and the extension piece is increased, and it is less likely to resonate with the exhaust system.

In the present invention, it is preferable that the floor includes a front floor and a rear floor, and the rear floor includes: an overlapping portion that overlaps and combines with the upper surface of the rear end portion of the front floor; The rear end of the overlapping portion extends upward; and a first horizontal wall portion, which extends rearward from the upper end edge of the first vertical wall portion, the closed cross-section frame is a middle frame beam, and the middle frame beam It 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. 1 vertical wall portion, the first horizontal wall portion, the second vertical wall portion, and the second horizontal wall portion form the first closed section, and the upper end of the vertical piece is connected to the second vertical wall portion. The wall portion is joined, and an extension piece is provided on the side of the vertical piece, and the extension piece extends to the lower surface of the second horizontal wall portion and joins with the second horizontal wall portion, and the horizontal piece The other end is coupled in a state of being sandwiched between the rear end of the front floor and the overlapping portion of the rear floor.

According to the above configuration, when a vertical load (vibration) is applied to the vertical surface, 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.

Therefore, the mounting bracket is less likely to vibrate in the up and down direction.

In addition, since the other end of the horizontal piece is connected, when a horizontal or vertical load is applied to the vertical surface, the horizontal piece is supported by the front floor or the like through the horizontal piece. Therefore, the mounting bracket is less likely to vibrate in the horizontal direction or rotate around the vertical direction.

In the present invention, it is preferable that each end portion of the center frame cross member in the vehicle width direction is connected to left and right side sills (sidesills), and that the center frame cross member has a clamp joint portion extending from the side sills. The front end of the second horizontal wall part is extended and connected in a state of being clamped between the rear end part of the front floor and the overlapping part of the rear floor, and a cutout is provided on a part of the clamping joint part. , the other end of the horizontal sheet is sandwiched between the rear end of the front floor and the overlapping portion of the rear floor through the cutout.

According to the above structure, the other end of the horizontal sheet can be joined between the front floor and the rear floor. In addition, since the ridge line formed at the corner between the second horizontal wall portion and the second vertical wall portion has no notch, the strength of the center cross member in the vehicle width direction is not reduced. Furthermore, the weight of the vehicle can be reduced by the cutout.

In the present invention, it is preferable that a protruding portion of the horizontal sheet is formed on the horizontal sheet, the protruding portion of the horizontal sheet extends in the direction in which the horizontal sheet extends, and a corresponding protruding portion is formed on the extension sheet, and the protruding portion of the horizontal sheet is formed on the extension sheet. The portion between the pair of protrusions protrudes to the opposite side of the vertical surface, and the horizontal piece protrusion is continuous with the opposite protrusion.

According to the above structure, the tension and compression strength of the horizontal sheet are improved, and the mounting bracket is less likely to vibrate in the horizontal direction.

In the present invention, it is preferable that an upper end protrusion is formed on the upper end of the vertical piece, and the lower side of the upper end protrusion is divided into two parts, each of which is continuous with each of the pair of protrusions.

According to the above structure, the tension and compression strength of the vertical piece in the vertical direction (vertical direction) are improved, and the mounting bracket is less likely to vibrate in the vertical direction.

In the present invention, it is preferable to further include a rear end support bar for supporting the rear end of the exhaust system, the rear end support bar being attached to the end plate of the rear side frame and extending outward in the vehicle width direction.

According to the above configuration, since the rear end support rod is supported by the rigid end plate, 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 positioned rearward on the vehicle width direction outside. Therefore, the vibration (noise) of the exhaust system is not easily transmitted to the interior of the vehicle.

【Invention effect】

According to the present invention, it is possible to provide a vehicle exhaust system support structure capable of improving the durability of a welded portion for joining a support bar and a mounting bracket to a vehicle.

Description of drawings

FIG. 1 is a bottom view of the rear side of the underbody of the embodiment seen from below.

Fig. 2 is a perspective view of a front exhaust system support member viewed from behind.

Fig. 3 is an enlarged perspective view of the front exhaust system support member shown in Fig. 2 .

Fig. 4 is a cross-sectional view taken along the arrow line IV-IV in Fig. 1 .

Fig. 5 is a cross-sectional view taken along the arrow line V-V in Fig. 4 .

Fig. 6 is a cross-sectional view taken along the arrow line VI-VI in Fig. 4 .

Fig. 7 is a cross-sectional view taken along line VII-VII of Fig. 2 .

Fig. 8 is a perspective view of the mounting bracket viewed from the front from the lower left side.

Fig. 9 is a perspective view of the main muffler on the right side viewed from the upper right side from the rear.

Explanation of reference signs

1: exhaust system support structure; 4: support rod (4A: L-shaped rod 4B: rear end support rod); 5: mounting bracket; 6: vertical rod part; 7: horizontal rod part; 9: end plate; 10: first piece; 11: vertical piece; 12: flange piece; 13: extension piece; 14: vertical surface; 15: first protrusion (protrusion); 16: upper end protrusion; 20: second 21: Horizontal sheet; 22: Extended sheet; 23: Second projection (protrusion); 24: Extended vertical surface; 26: Horizontal sheet projection; 50: Underbody; 51: Front floor (floor); 52 : rear floor (floor); 60: middle frame beam (8: closed section frame); 62: second vertical wall; 63: second horizontal wall; 65: clamp joint; 70: exhaust system; 71: exhaust pipe; L1: ridge line; S1: first closed section; S2: second closed section; S3: notch.

Detailed ways

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" refers to the up-down direction of the vehicle, and although it cannot be completely equated with the up-down direction of the vehicle in the strict sense, it also includes the vertical direction considered to be equivalent to the up-down direction from the viewpoint of the effect. direction.

In addition, the "horizontal direction" refers to the vertical direction perpendicular to the vertical direction of the vehicle, although it cannot be completely equated with the vertical direction in the strict sense, it also includes the same as the vertical direction from the viewpoint of the effect. direction.

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 underbody 50 viewed from below.

As shown in Figure 1, the exhaust system 70 has: an exhaust manifold (exhaust manifold not shown), which is connected with each cylinder (cylinder) of the engine not shown, for collecting exhaust gas; an exhaust pipe 71, which For making the exhaust gas collected by the exhaust manifold flow out to the rear of the vehicle; a catalytic exhaust cleaner (not shown) which removes harmful components in the exhaust gas by catalytic reaction; and the sub muffler 72 and the main muffler 73 , which are used to reduce the noise generated by the exhaust gas.

The exhaust pipe 71 is an elongated member formed by connecting a plurality of tubular members (exhaust pipes).

Although not shown, the front portion of the exhaust pipe 71 is arranged in the engine compartment, and the front end portion of the exhaust pipe 71 is connected to an exhaust manifold.

As shown in FIG. 1 , the middle portion 71 a and the rear portion 71 b of the exhaust pipe 71 are arranged on the lower side of the underbody 50 .

The middle part 71a of the exhaust pipe 71 is attached to the center part of the vehicle width direction of the underbody 50 via the exhaust system support structure 1 (refer FIG. 2). In addition, a sub-muffler 72 is provided at an intermediate portion 71 a of the exhaust pipe 71 .

The rear portion 71b of the exhaust pipe 71 is branched outward in the vehicle width direction, and a main muffler 73 is provided at each rear end.

In addition, each main muffler 73 is attached to the vehicle width direction outer side of the underbody 50 via the exhaust system support structure 1 (see FIG. 9 ).

Further, a rear end portion 71c of the exhaust pipe 71 extends rearward from the rear surface of the main muffler 73 .

(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 the middle part of the exhaust system 70 (the middle part 71a of the exhaust pipe 71); The side exhaust system support member 3 supports the rear end portion of the exhaust system 70 (main muffler 73 ).

The front exhaust system support member 2 and the rear exhaust system support member 3 support an exhaust system 70 with rod-shaped support rods 4 .

Here, as shown in FIG. 2 and FIG. 3 , the support rod 4 does not directly support the exhaust system 70 (exhaust pipe 71), but indirectly by supporting the supported member 80 provided on the outer peripheral surface of the exhaust system 70. Exhaust system 70 is supported.

In addition, the supported member 80 includes: a flange 81 provided on the outer peripheral surface of the exhaust pipe 71; a pair of pipe supports 82, one end of which is connected to the flange 81; The other end of 82 is connected.

In addition, the connecting portion 83 is supported by the support rod 4 passing through the connecting portion 83 so that the exhaust system 70 (exhaust pipe 71 ) is attached to the underbody 50 in a suspended state.

Next, the basic structure of the front exhaust system support member 2 will be described.

(Front exhaust system support part 2)

The front exhaust system support member 2 includes: a support bar 4 for supporting an exhaust pipe 71 (exhaust system 70 ); and a mounting bracket 5 for attaching the support bar 4 to the underbody 50 .

In addition, as shown in FIG. 4 , the floors of the underbody 50 (the front floor 51 and the rear floor 52 ) are joined to the closed-section frame 8 . In addition, the floor and the closed section frame 8 form a first closed section S1.

The mounting bracket 5 is joined to the lower side of the underbody 50 to form a second closed section S2 below the first closed section S1.

In addition, the mounting bracket 5 includes a vertical piece 11 extending vertically downward from the closed section frame 8 to constitute a second closed section S2.

The support rod 4 is an L-shaped rod 4A that is L-shaped.

The L-shaped rod 4A includes: a vertical bar portion 6 extending in the vertical direction (vertical direction) along a vertical surface 14 formed on the rear surface 11a of the vertical piece 11, and passes through a welded portion not shown and the vertical surface 14. joining; and the horizontal rod portion 7 extending horizontally (forward) from the lower end of the vertical rod portion 6 to support the connection portion 83 (exhaust system 70 ).

In addition, although not shown in particular, the welded portion is formed by melting and hardening the metal material by welding (MIG welding), and a plurality of vertical (upper and lower) along the vertical bar portion 6 and the vertical surface 14 are formed. .

According to the above-mentioned structure of the front side exhaust system support member 2, when the L-shaped rod 4A vibrates in the vertical direction due to the vibration of the exhaust pipe 71, a load (vibration) in the vertical direction is applied to the vertical direction of the L-shaped rod 4A. The vertical surface 14 to which the rod portion 6 is joined.

Here, since the vertical surface 14 extends in the vertical direction, the load (vibration) in the vertical direction is not concentrated on a part of the vertical surface 14, but is distributed over the entire vertical surface 14, in other words, it is distributed in the vertical direction. Therefore, the durability of the welded portion can be improved.

In addition, when a load (vibration) in the vertical direction is applied to the vertical surface 14 to vibrate the vertical piece 11 in the vertical direction, the vertical piece 11 is supported by the closed section frame 8 having high rigidity. Therefore, the vibration frequency of the vertical piece 11 is increased.

Moreover, since the vertical piece 11 constitutes the second closed section S2, the strength of the vertical piece 11 itself is relatively high, and the vibration frequency of the vertical piece 11 is further increased.

To sum up, it is difficult for the vertical piece 11 to resonate with the exhaust system 70 whose vibration frequency is relatively low.

Next, the specific structure of the front exhaust system support member 2 (underbody 50, L-shaped bar 4A, mounting bracket 5) will be described in detail.

(Underbody 50)

As shown in FIG. 1 , the underbody 50 includes: a front floor 51 constituting the bottom wall of the vehicle compartment; a rear floor 52 arranged behind the front floor 51 and constituting the bottom wall of the luggage compartment; The left and right ends of the front floor 51 extend in the front-rear direction; the left and right floor frames 54 extend in the front-rear direction at positions closer to the inside in the vehicle width direction than the left and right side beams 53; Extending in the width direction, each end is joined to the left and right side members 53 ; and the left and right rear side frames 55 extend rearward from each end of the center frame cross member 60 in the vehicle width direction.

The front exhaust system support member 2 is a center portion in the vehicle width direction with respect to the underbody 50 , and is provided at the boundary between the front floor 51 and the rear floor 52 where the middle frame cross member 60 is arranged.

(rear floor 52)

As shown in Figure 4, the rear floor 52 is provided with: an overlapping portion 52a, which overlaps and combines with the upper surface of the rear end portion 51a of the front floor 51; a first vertical wall portion 52b, which extends upward from the rear end of the overlapping portion 52a; And the 1st horizontal wall part 52c extends rearward from the upper edge of the 1st vertical wall part 52b.

Therefore, a step is formed on the lower surface of the underbody 50 at the boundary between the front floor 51 and the rear floor 52 , and the rear side (rear floor 52 ) is higher than the front side (front floor 51 ).

(middle frame beam 60)

The middle frame beam 60 is the above-mentioned closed section frame 8 .

As shown in FIG. 4 , the middle frame cross member 60 includes: an upper joint portion 61 joined to the lower surface of the first horizontal wall portion 52c of the rear floor 52; The front end (the lower surface of the first horizontal wall portion 52c) extends downward; the second horizontal wall portion 63 extends forward from the lower end of the second vertical wall portion 62; the lower joint portion 64 extends from the second horizontal wall The front end of portion 63 extends downward;

Moreover, the said 1st closed cross section S1 is formed by the 1st vertical wall part 52b, the 1st horizontal wall part 52c, the 2nd vertical wall part 62, and the 2nd horizontal wall part 63.

As shown in FIG. 2 , a ridge line L1 extending in the vehicle width direction is formed at a corner portion formed by the second horizontal wall portion 63 and the second vertical wall portion 62 .

In addition, each end portion in the vehicle width direction of the second vertical wall portion 62 and the second horizontal wall portion 63 is joined to the left and right side beams 53, and the ridge line L1 extends to the left and right side beams 53 (refer to the dotted line L1' in FIG. 2 ). ). The center frame cross member 60 therefore has sufficient strength for a side collision.

In addition, each end portion in the vehicle width direction of the second horizontal wall portion 63 is formed flat, and the center portion in the vehicle width direction is recessed upward.

The lower joint portion 64 is a wall portion extending downward from the center portion in the vehicle width direction of the second horizontal wall portion 63 and continuous with the rear end of the clamp coupling portion 65 , and has a substantially trapezoidal shape when viewed from the rear.

Moreover, the lower joint part 64 extends along the 1st vertical wall part 52b of the rear floor panel 52, and is joined to the 1st vertical wall part 52b by welding (refer FIG. 4).

As shown in FIGS. 2 and 3 , each end in the vehicle width direction of the clamp joint portion 65 is continuous with the front end of the second horizontal wall portion 63 , and the center portion in the vehicle width direction is continuous with the lower end of the lower joint portion 64 .

As shown in FIG. 7 , the clamp joint portion 65 is clamped between the rear end portion 51 a of the front panel 51 and the overlapping portion 52 a of the rear panel 52 , and is combined with the front panel 51 and the rear panel 52 by welding.

As shown in FIG. 2 and FIG. 3 , a cutout S3 is provided on the clip joint portion 65 for exposing the joint portion of the front floor 51 and the rear floor 52 .

The slit S3 is formed near the center in the vehicle width direction at a position where the front exhaust system support member 2 is provided.

Therefore, as shown in FIG. 4 , a part (horizontal piece 21 described later) of the mounting bracket 5 can be sandwiched and coupled between the front floor 51 and the rear floor 52 .

In addition, as shown in FIG. 3 , a slit S3 is also formed on the lower end side of the lower joint portion 64 , and the joint portion of the front panel 51 and the rear panel 52 can be reliably exposed from the slit S3 .

In addition, the slit S3 is formed only in the clamp joint part 65 and the lower joint part 64, and is not formed in the ridge line L1. Therefore, the vehicle width direction strength of the middle frame cross member 60 is not lowered, 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 part 7 is equipped with the small diameter part 7a and the anti-slip part 7b.

The small-diameter portion 7a is a portion for supporting the coupling portion 83, and is formed to have a smaller diameter than other portions. According to the structure of 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 steps so that it is difficult to be displaced, and the exhaust pipe 71 is difficult to vibrate.

The anti-slip portion 7b is a large-diameter portion provided closer to the distal end side (tip side) than the small-diameter portion 7a. Accordingly, it is possible to prevent the coupling portion 83 from coming off the horizontal bar portion 7 .

(mounting bracket 5)

The mounting bracket 5 is a substantially L-shaped member when viewed from the side.

One end of the mounting bracket 5 is joined to the middle frame cross member 60, and the other end is joined to the floor (the front floor 51 and the rear floor 52), thereby constituting the second closed section S2.

The mounting bracket 5 includes: a first piece 10 forming one side of the L-shape; and a second piece 20 forming the other side of the L-shape.

The first piece 10 and the second piece 20 are respectively metal pieces having a substantially L-shape when viewed from the side, and are formed by press working.

Hereinafter, the first sheet 10 and the second sheet 20 will be described in detail.

(1 piece 10)

The first piece 10 includes: the above-mentioned vertical piece 11 extending vertically downward from the second vertical wall portion 62 of the center frame cross member 60; and a flange piece 12 extending horizontally from the lower end of the vertical piece 11. and a pair of extension pieces 13 extending from the side of the vertical piece 11 to the lower surface of the second horizontal wall portion 63 .

The above-mentioned vertical surface 14 is formed at the middle portion in the vertical direction of the rear surface 11 a of the vertical piece 11 , and the vertical surface 14 is joined to the vertical rod portion 6 of the L-shaped rod 4A.

As shown in FIG. 3 , a pair of first protrusions 15 are formed on both left and right sides of the vertical surface 14 , and the pair of first protrusions 15 protrude toward the vertical bar portion 6 side.

Therefore, the vertical surface 14 is formed between the pair of first protrusions 15 as a concave groove surface, thereby strengthening the joint between the vertical surface 14 and the vertical bar portion 6 by welding (MIG welding). In this way, the rigidity of the vertical piece 11 constituting the vertical surface 14 is increased, and the vibration frequency of the vertical piece 11 is increased.

As shown in FIGS. 4 and 5 , the upper end portion 11 b of the vertical piece 11 is joined to the rear surface of the second vertical wall portion 62 of the middle frame cross member 60 by welding.

An upper end protrusion 16 is formed at the center in the vehicle width direction of the upper end 11 b of the vertical piece 11 , and the upper end protrusion 16 protrudes toward the rear surface 11 a side.

As shown in FIG. 3 , the lower part side of the upper end protrusion 16 is divided into two parts, and each of the pair of first protrusions 15 is continuous with each of the first protrusions 15 .

Accordingly, when a vertical load (vibration) is applied to the portion between the upper end portion 11 b and the vertical surface 14 , that is, the vertical surface 14 , the tensile and compressive strengths of the portion where the vertical stress acts are improved. Therefore, the vibration frequency of the vertical piece 11 is increased.

As shown in FIG. 4 , a pair of extension pieces 13 extend from the upper and lower sides toward the middle portion to the front side and upward on both sides of the vertical piece 11 . Further, at the upper ends of the pair of extension pieces 13 , a joining flange 13 a extending outward in the vehicle width direction is formed, and the joining flange 13 a is joined to the lower surface of the second horizontal wall portion 63 .

Accordingly, when a load (vibration) in the vertical direction is applied to the vertical surface 14, there is a pair of The second horizontal wall portion 63 to which the extension piece 13 is joined supports. Therefore, the vibration frequency of the vertical piece 11 is increased.

(2nd sheet 20)

The second piece 20 is provided with: a horizontal piece 21 extending in the horizontal direction, a rear end 21a (one end) combined with the flange piece 12 of the first piece 10; and an extension piece 22 extending from the rear end of the horizontal piece 21 ( one end) extends downward.

In addition, the front end part 21b (the other end part) of the horizontal piece 21 is sandwiched between the rear end part 51a of the front panel 51, and the overlapping part 52a of the rear panel 52, and is joined.

Accordingly, the horizontal piece 21 , the vertical piece 11 , the first vertical wall portion 52 b of the rear floor 52 , and the second horizontal wall portion 63 of the center cross member 60 form a second closed cross-section S2 .

Also, when a load in the horizontal direction or around the vertical direction is applied to the vertical surface 14 , the vertical sheet 11 is supported by the joint portion of the front floor 51 and the rear floor 52 through the horizontal sheet 21 . Therefore, even if a load in the horizontal direction or in the direction centering on the vertical line is applied to the vertical surface 14 , the vertical piece 11 is unlikely to vibrate in the horizontal direction or rotate around the vertical direction. Also, the front end portion 21 b of the horizontal piece 21 is sandwiched between the front floor 51 and the rear floor 52 by passing through the above-mentioned slit S3 of the middle frame cross member 60 .

As shown in FIG. 8 , a horizontal piece protruding portion 26 dented upward is formed at a central portion of the horizontal piece 21 in the vehicle width direction. The horizontal piece protruding portion 26 extends in the front-back direction, and the tension and compression strength of the horizontal piece 21 in the front-back direction are improved.

Moreover, the recessed part 12a corresponding to the horizontal piece protrusion part 26 is formed in the flange piece 12 of the 1st piece 10 joined to the upper side of the horizontal piece 21 (refer FIG. 6).

As shown in FIG. 4 , the extension piece 22 is used to extend downward the joint portion with the vertical rod portion 6 of the L-shaped rod 4A, and has an extended vertical surface 24 for joining with the vertical rod portion 6 . Accordingly, the load applied by the L-shaped bar 4A is applied to the extended vertical surface 24 in addition to the vertical surface 14, and the load (vibration) in the vertical direction is dispersed. Therefore, the durability of the welded portion is further improved.

In addition, the portion supported by the extension piece 22 is located below the vertical surface 14 of the vertical piece 11 and is located in the vicinity of the exhaust pipe 71 which is a vibration source. Therefore, the support 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 , a pair of second protrusions 23 protruding rearward are formed on the extension piece 22 .

Furthermore, the extended vertical surface 24 is formed between a pair of 2nd protrusion part 23 (rear surface facing the protrusion part 25), and is formed in the concave groove surface. Therefore, the bonding between the extended vertical surface 24 and the vertical bar portion 6 by welding (MIG welding) is strengthened, and the vibration frequency of the extension piece 22 is further increased.

In addition, as shown in FIG. 8 , on the front surface of the extension piece 22 , between the pair of second protrusions 23 , a facing protrusion 25 that protrudes relatively forward is formed.

The opposite protruding portion 25 is continuous with the horizontal sheet protruding portion 26, and the tension and compressive strength of the horizontal sheet 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 4B for supporting a main muffler 73 provided on the rear end side of the exhaust system 70 .

The rear end support rod 4B is supported by the end plate 9 joined to the rear end of the rear side frame 55 .

The rear end support rod 4B includes: a base end portion 40 supported by the end plate 9 and extending outward in the vehicle width direction; a downwardly extending rod portion 41 extending downward from the outside of the base end portion 40 in the vehicle width direction; The extension part 42 extends horizontally forward from the lower end of the downward extension rod part 41 to support the connection part 83 .

Further, a support portion 9 a is formed at an upper end portion on the outer side in the vehicle width direction of the end plate 9 . The support portion 9 a is bent into a substantially U-shape, and the rear end support rod 4B is supported on the support portion 9 a.

According to the structure of the rear exhaust system support member 3 described above, since the rear end support rod 4B is supported by the rigid end plate 9 , it is possible to prevent the main muffler 73 from vibrating.

In addition, the main muffler 73 supported by the rear end support rod 4B is located on the outer side in the vehicle width direction near the rear end of the vehicle. Therefore, the vibration (noise) of the main muffler 73 is less likely to be transmitted to the interior of the vehicle, and quietness can be ensured.

The embodiments have been described above, but the present invention is not limited thereto.

In the embodiment, the vertical piece 11 of the mounting bracket 5 is combined with the middle cross member 60 , but it may be a closed cross-section frame such as a rear cross member provided on the underbody 50 , for example.

In addition, in the embodiment, the front end 21b of the horizontal piece 21 of the mounting bracket 5 is clamped between the front floor 51 and the rear floor 52 to be combined, but as long as the front end 21b of the horizontal piece 21 can be fixed, other fixed method.

Claims (6)

1. a kind of vehicle exhaust system supporting structure, which is characterized in that have:

The support rod of exhaust system and the mounting bracket for the support rod to be installed on to body bottom are supported,

The body bottom has floor and closed cross-section frame, wherein and the closed cross-section frame is incorporated on the downside of the floor, And it is formed together the 1st closed cross-section with the floor,

The mounting bracket has vertical, this vertical extends and from the closed cross-section frame to vertical direction downside in institute The lower section for stating the 1st closed cross-section forms the 2nd closed cross-section,

The support rod has:

Vertical stick portion, along be formed in described vertical it is vertical extend towards vertical direction, and pass through weld part and the lead Face engagement directly；With

Horizon bar portion, the lower end from the vertical stick portion is horizontally extending to support the exhaust system,

The mounting bracket has in generally L-shaped the 1st and in generally L-shaped the 2nd,

Described 1st includes

Described vertical, end is engaged in the closed cross-section frame thereon；With

Flange piece, it is horizontally extending from the vertical lower end,

Described 2nd includes

Horizontal plate, it is horizontally extending, and one end and the flange chip bonding；With

Extension sheet is extended downward from one end of the horizontal plate, and make it is described it is vertical extend downwards,

It is prominent that the oriented support rod side is formed in the two sides in the vertical face for being set to described vertical and the extension sheet A pair of of protruding portion,

The vertical face is the groove face being formed between the pair of protruding portion,

The floor has preceding floor and rear floor,

Floor has after described:

Overlapping portion, it is Chong Die with the upper surface of rear end on the preceding floor to combine；

1st longitudinal wall part extends upwards from the rear end of the overlapping portion；With

1st horizontal walls rearward extend from the upper edge of the 1st longitudinal wall part,

The closed cross-section frame is intermediate frame crossbeam,

The intermediate frame crossbeam has:

2nd longitudinal wall part is extended downward from the lower surface of the 1st horizontal walls；With

2nd horizontal walls extend forwards from the lower end of the 2nd longitudinal wall part,

The described 1st is formed by the 1st longitudinal wall part, the 1st horizontal walls, the 2nd longitudinal wall part and the 2nd horizontal walls Closed cross-section,

The vertical upper end is engaged with the 2nd longitudinal wall part,

The vertical side is provided with Extendible flake, the Extendible flake to the lower surface of the 2nd horizontal walls extend and with The 2nd horizontal walls engagement,

The other end of the horizontal plate is to be clamped between the rear end on the preceding floor and the overlapping portion on the rear floor State be combined.

2. vehicle exhaust system supporting structure according to claim 1, which is characterized in that

Each end in the vehicle width direction of the intermediate frame crossbeam in conjunction with the curb girder of left and right,

The intermediate frame crossbeam has clamping engaging portion, which extends from the front end of the 2nd horizontal walls Come and be clamped in the rear end on the preceding floor and it is described after floor overlapping portion between combinations of states,

It is provided with notch in a part of the clamping engaging portion,

The other end of the horizontal plate by the notch be held in the preceding floor rear end and it is described after floor Overlapping portion between.

3. vehicle exhaust system supporting structure according to claim 2, which is characterized in that

Horizontal plate protruding portion is formed on the horizontal plate, which prolongs to the direction that the horizontal plate extends It stretches,

Be formed with opposing projections in the extension sheet, the opposing projections between the pair of protruding portion and to institute It is prominent to state vertical face opposite side,

The horizontal plate protruding portion and the opposing projections are continuous.

4. vehicle exhaust system supporting structure according to claim 2, which is characterized in that

It is formed with upper end tab in the vertical upper end,

The lower side of the upper end tab be divided into two parts come it is continuous with each protruding portion in the pair of protruding portion respectively.

5. vehicle exhaust system supporting structure according to claim 3, which is characterized in that

It is formed with upper end tab in the vertical upper end,

The lower side of the upper end tab be divided into two parts come it is continuous with each protruding portion in the pair of protruding portion respectively.

6. vehicle exhaust system supporting structure according to any one of claims 1 to 5, which is characterized in that

It is also equipped with the rear end support rod of the rear end for supporting the exhaust system,

The rear end support rod is installed in the end plate of rear side, and extends to vehicle width direction outside.