JP7280167B2 - Muffler support structure - Google Patents

Description

The present invention relates to a muffler support structure.

For example, Patent Literature 1 describes an exhaust purification device. An exhaust purification device described in Patent Document 1 includes a NOx adsorption catalyst that reduces NOx contained in exhaust gas from a diesel engine.

Japanese Patent Application Laid-Open No. 2008-133760

Exhaust gas purifiers such as those of the above conventional technology are becoming larger in size in accordance with exhaust gas purification regulations. In recent years, many exhaust purification devices have a muffler with a catalyst. By the way, the muffler may be supported by the frame of the vehicle body. In this case, rubber is used as one part of the structure for supporting the muffler on the frame to absorb the vibrations of the exhaust system and the vehicle body. As a measure to ensure the heat resistance of the rubber, it is common to move the rubber away from the muffler, which is the heat source. However, from the viewpoint of securing mounting space, etc., the direction and amount of transfer of the rubber are often restricted. Therefore, there is a demand for a structure that reduces the heat transferred from the muffler to the rubber.

SUMMARY OF THE INVENTION An object of the present invention is to provide a muffler support structure capable of reducing heat transferred from the muffler to the rubber.

According to one aspect of the present invention, in a muffler support structure for supporting a muffler on a frame, a first bracket connected to the muffler, a second bracket connected to the frame, and at least between the first bracket and the second bracket a rubber disposed thereon; a metal plate disposed between the first bracket and the rubber; and a fastener for fastening the rubber together with the metal plate to the first bracket and the second bracket, the metal plate A cylindrical portion defining a bolt hole through which a fastening bolt passes, and a plurality of protrusions projecting from the cylindrical portion to the outer peripheral side of the metal plate and defining a plurality of notches opened to the outer peripheral side of the metal plate. have.

In such a muffler support structure, a metal plate is arranged between the first bracket connected to the muffler and the rubber. Therefore, the heat transmitted from the muffler to the first bracket is transmitted to the rubber through the metal plate. This reduces heat transfer from the muffler to the rubber. Here, the metal plate is provided with bolt holes through which the fastening bolts of the fastener pass, and a plurality of notches that are open to the outer peripheral side of the metal plate. Therefore, since the contact area of the metal plate with the rubber is narrowed, the heat capacity of the metal plate is reduced. This further reduces heat transfer from the muffler to the rubber.

In addition, the metal plate is provided with a plurality of notches that are open to the outer peripheral side of the metal plate. Therefore, since outside air is introduced into the metal plate through the notch, the heat dissipation of the metal plate is improved. This further reduces heat transfer from the muffler to the rubber.

The plurality of projections may be arranged radially with respect to the cylindrical portion. In such a configuration, outside air is introduced into the metal plate through the notch over the entire circumference of the metal plate, so the heat dissipation of the metal plate is further improved. This further reduces the heat transferred from the muffler to the rubber. In addition, the surface pressure of the rubber against the metal plate can be distributed in a well-balanced manner.

The metal plate may consist of stainless steel. Stainless steel is a metallic material with low thermal conductivity. By using such stainless steel as the metal plate material, heat transfer from the muffler to the rubber is further reduced.

The number of rubbers is two, and the two rubbers sandwich the second bracket between the region between the first bracket and the second bracket and the region on the opposite side of the first bracket with respect to the second bracket. Positioned, a fastener may fasten the two rubbers together with the metal plate to the first bracket and the second bracket. With such a configuration, the two rubbers can sufficiently absorb vehicle system vibration transmitted from the frame.

According to the present invention, heat transferred from the muffler to the rubber can be reduced.

1 is a plan view showing an exhaust purification device having a muffler support structure according to one embodiment of the present invention; FIG. FIG. 2 is a rear view of the exhaust purification device shown in FIG. 1; FIG. 3 is a sectional view showing one muffler support unit shown in FIG. 2; 3 is a cross-sectional view showing the other muffler support unit, which is the muffler support structure according to the embodiment of the present invention shown in FIG. 2; FIG. 5 is a plan view of the metal plate shown in FIG. 4; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent elements are denoted by the same reference numerals, and overlapping descriptions are omitted.

FIG. 1 is a plan view showing an exhaust gas purification device having a muffler support structure according to one embodiment of the present invention. 2 is a rear view of the exhaust purification device shown in FIG. 1. FIG. 1 and 2, an exhaust purification device 1 is a device for purifying exhaust gas discharged from a diesel engine mounted on a vehicle.

The exhaust purification device 1 includes a muffler 2 connected to a diesel engine (not shown) through an exhaust pipe, and a muffler 4 connected to the muffler 2 through an exhaust pipe 3 . The muffler 4 is arranged downstream of the muffler 2 . The mufflers 2 and 4 are arranged side by side in the width direction (horizontal direction) of the vehicle. The exhaust pipe 3 is connected to the mufflers 2 and 4 while being bent like a crank.

The muffler 2 is provided with a DPF (Diesel Exhaust Particulate Filter). DPF is a catalyst that removes PM from exhaust gas by collecting particulate matter (PM) contained in exhaust gas. The muffler 4 is provided with an SCR (selective reduction catalyst). SCR is a catalyst that uses HC (hydrocarbon) as an additive to reduce and purify NOx contained in exhaust gas.

The exhaust purification device 1 also includes two muffler support units 6 that support the muffler 2 on the frame 5 and two muffler support units 7 that support the muffler 4 on the frame 5 . The frame 5 constitutes a part of the vehicle body of the vehicle and extends in the longitudinal direction of the vehicle. The frame 5 has a U-shaped cross section.

The two muffler support units 6 are arranged side by side in the longitudinal direction of the vehicle. The muffler support unit 6, as also shown in FIG.

The hanging bracket 11 is connected to the muffler 2 . The hanging bracket 11 has an L-shaped cross section. The suspension bracket 11 is composed of a suspension portion 16 and a rubber fastening portion 17 integrated with the suspension portion 16 . The hanging portion 16 is fixed to the upper portion of the muffler 2 by, for example, bolts and nuts (not shown). The rubber fastening portion 17 is provided with a bolt hole 17a having a circular cross section through which a fastening bolt 20, which will be described later, passes.

Support bracket 12 is connected to frame 5 . The support bracket 12 has an L-shaped cross section. The support bracket 12 is composed of a support portion 18 and a rubber fastening portion 19 integrated with the support portion 18 . The support portion 18 is fixed to the side surface 5a on one side (muffler 2 side) of the frame 5 by, for example, bolts and nuts (not shown). The rubber fastening portion 19 is provided with a bolt hole 19a having a circular cross section through which a fastening bolt 20 (described later) passes.

The rubber 13 is arranged between the rubber fastening portion 17 of the suspension bracket 11 and the rubber fastening portion 19 of the support bracket 12 . The rubber 14 is arranged above the rubber fastening portion 19 , that is, on the side opposite to the suspension bracket 11 with respect to the rubber fastening portion 19 . Therefore, the rubbers 13 and 14 are arranged so as to sandwich the rubber fastening portion 19 of the support bracket 12 in the vertical direction of the vehicle.

The rubbers 13 and 14 are rubber materials having cushioning properties for absorbing exhaust system vibrations and vehicle system vibrations. Exhaust system vibration is vibration transmitted from a diesel engine (not shown) through an exhaust pipe. The vehicle system vibration is vibration transmitted from the road surface via the wheels, suspension, and frame 5 (not shown). By providing such rubbers 13 and 14, exhaust system vibration is less likely to be transmitted to the vehicle body, and exhaust system vibration and vehicle system vibration are less likely to be synchronized.

The rubbers 13, 14 have a cylindrical shape. Bolt holes 13a and 14a having circular cross sections through which fastening bolts 20 (described later) pass are provided in the radial centers of the rubbers 13 and 14, respectively.

Fasteners 15 fasten rubbers 13 and 14 to suspension bracket 11 and support bracket 12 . The fastener 15 has a fastening bolt 20 , a nut 21 screwed onto the fastening bolt 20 , and a retainer ring 22 engaged with the fastening bolt 20 .

The fastening bolt 20 is composed of a head portion 20a and a screw portion 20b integrated with the head portion 20a. The head 20 a is arranged above the rubber 14 . The nut 21 is arranged below the rubber fastening portion 17 of the suspension bracket 11 . A washer may be interposed between the nut 21 and the rubber fastening portion 17 . The pressing ring 22 is a member that is arranged between the head 20 a and the rubber 14 and presses the rubber 14 .

When the rubbers 13 and 14 are fastened to the suspension bracket 11 and the support bracket 12 using such a fastener 15, the threaded portion 20b of the fastening bolt 20 is pressed from above by the ring 22, the bolt hole 14a of the rubber 14, the rubber The bolt hole 19a of the fastening portion 19, the bolt hole 13a of the rubber 13, and the bolt hole 17a of the rubber fastening portion 17 are penetrated, and in this state, the nut 21 is fitted to the tip portion of the screw portion 20b. By tightening the screw portion 20b and the nut 21, the rubbers 13 and 14 are fastened and fixed while being compressed in the vertical direction of the vehicle.

The two muffler support units 7 are arranged side by side in the longitudinal direction of the vehicle. The muffler support unit 7 constitutes the muffler support structure of this embodiment. The muffler support unit 7, as also shown in FIG.

The hanging bracket 31 is a first bracket connected to the muffler 4 . The suspension bracket 31 has an L-shaped cross section, like the suspension bracket 11 described above. The suspension bracket 31 is composed of a suspension portion 37 and a rubber fastening portion 38 integrated with the suspension portion 37 . The suspending portion 37 is fixed to the upper portion of the muffler 4 by, for example, bolts and nuts (not shown). The rubber fastening portion 38 is provided with a bolt hole 38a having a circular cross section through which a fastening bolt 46, which will be described later, passes.

A support bracket 32 is a second bracket that is connected to the frame 5 . The support bracket 32 has an L-shaped cross section, like the support bracket 12 described above. The support bracket 32 is composed of a support portion 39 and a rubber fastening portion 40 integrated with the support portion 39 . The support portion 39 is fixed to the side surface 5b on the other side (muffler 4 side) of the frame 5 by, for example, bolts and nuts (not shown). The rubber fastening portion 40 is provided with a bolt hole 40a having a circular cross section through which a fastening bolt 46 (described later) passes.

The rubber 33 is arranged between the rubber fastening portion 38 of the suspension bracket 31 and the rubber fastening portion 40 of the support bracket 32 . The rubber 34 is arranged above the rubber fastening portion 40 , that is, on the opposite side of the suspension bracket 31 with respect to the rubber fastening portion 40 . Therefore, the rubbers 33 and 34 are arranged so as to sandwich the rubber fastening portion 40 of the support bracket 32 in the vertical direction of the vehicle.

The function of rubbers 33, 34 is similar to rubbers 13, 14 described above. The rubbers 33, 34 have a cylindrical shape. Bolt holes 33a and 34a having circular cross sections through which fastening bolts 46 (described later) pass are provided in the radial centers of the rubbers 33 and 34, respectively.

The metal plate 35 is arranged between the rubber fastening portion 38 of the hanging bracket 31 and the rubber 33 . That is, the metal plate 35 is arranged below the rubber 33 . The metal plate 35 is made of stainless steel.

As shown in FIG. 5, the metal plate 35 has a cylindrical portion 42 defining a bolt hole 41 through which a fastening bolt 46 (described later) passes, and a plurality of bolts protruding from the cylindrical portion 42 to the outer peripheral side of the metal plate 35 . and a protrusion 43 of The plurality of protrusions 43 define a plurality of cutouts 44 that are open to the outer peripheral side of the metal plate 35 . The bolt hole 41 has a circular shape in plan view. The notch 44 has a substantially V shape in plan view. The notch 44 forms an air layer of the metal plate 35 . The number and shape of the projections 43 and cutouts 44 are not particularly limited.

The plurality of protrusions 43 are radially arranged with respect to the tubular portion 42 . At this time, the metal plate 35 has a shape that is symmetrical with respect to the radial center of the metal plate 35 . Note that the point-symmetrical shape referred to here includes not only a completely point-symmetrical shape but also a substantially point-symmetrical shape in appearance.

Fasteners 36 fasten rubbers 33 and 34 together with metal plate 35 to suspension bracket 31 and support bracket 32 . The fastener 36 has a fastening bolt 46 , a nut 47 screwed onto the fastening bolt 46 , and a retaining ring 48 engaged with the fastening bolt 46 .

The fastening bolt 46 is composed of a head portion 46a and a screw portion 46b integrated with the head portion 46a. The head 46 a is arranged above the rubber 34 . The nut 47 is arranged below the rubber fastening portion 38 of the suspension bracket 31 . A washer may be interposed between the nut 47 and the rubber fastening portion 38 . The pressing ring 48 is a member that is arranged between the head portion 46 a and the rubber 34 and presses the rubber 34 .

When the rubbers 33 and 34 and the metal plate 35 are fastened to the suspension bracket 31 and the support bracket 32 using such a fastener 36, the threaded portion 46b of the fastening bolt 46 is held down from above by the ring 48 and the bolt of the rubber 34. It is passed through the hole 34a, the bolt hole 40a of the rubber fastening portion 40, the bolt hole 33a of the rubber 33, the bolt hole 41 of the metal plate 35, and the bolt hole 38a of the rubber fastening portion 38, and in that state, the tip portion of the screw portion 46b. The nut 47 is fitted in the . By tightening the screw portion 46b and the nut 47, the rubbers 33 and 34 are fastened and fixed together with the metal plate 35 while being compressed in the vertical direction of the vehicle.

By the way, the muffler 4 is provided with an SCR using HC as an additive, as described above. When HC is used as the additive, the SCR tends to reach a higher temperature than when urea is used as the additive. Therefore, if the structure of the muffler support unit 7 is the same as the structure of the muffler support unit 6, the high temperature heat of the SCR is transferred to the rubber 33 through the suspension bracket 31, and the temperature of the rubber 33 rises. .

In order to solve such a problem, a metal plate 35 is arranged between the suspension bracket 31 connected to the muffler 4 and the rubber 33 in this embodiment. Therefore, the heat transmitted from the muffler 4 to the suspension bracket 31 is transmitted to the rubber 33 through the metal plate 35 . Thereby, the heat transferred from the muffler 4 to the rubber 33 is reduced. Here, the metal plate 35 is provided with bolt holes 41 through which the fastening bolts 46 of the fasteners 36 pass, and a plurality of notches 44 opened to the outer peripheral side of the metal plate 35 . Accordingly, since the contact area of the metal plate 35 with the rubber 33 is narrowed, the heat capacity of the metal plate 35 is reduced. Thereby, the heat transmitted from the muffler 4 to the rubber 33 is further reduced. As a result, heat conduction from the muffler 4 to the rubbers 33, 34 is sufficiently reduced, so that the temperature of the rubbers 33, 34 can be reduced.

In addition, the metal plate 35 is provided with a plurality of cutouts 44 that are open to the outer peripheral side of the metal plate 35 . Therefore, outside air (air) is introduced into the metal plate 35 from the notch 44, so that the heat dissipation of the metal plate 35 is improved. Thereby, the heat transmitted from the muffler 4 to the rubber 33 is further reduced.

Moreover, in this embodiment, the plurality of protrusions 43 are arranged radially with respect to the tubular portion 42 . Therefore, since outside air is introduced into the metal plate 35 from the notch 44 over the entire circumference of the metal plate 35, the heat dissipation of the metal plate 35 is further improved. As a result, the heat transferred from the muffler 4 to the rubber 33 is further reduced. In addition, the surface pressure of the rubber 33 against the metal plate 35 can be distributed in an overall well-balanced manner.

Further, in the present embodiment, stainless steel, which has a low thermal conductivity, is used as the material of the metal plate 35, so heat transferred from the muffler 4 to the rubber 33 is further reduced.

Further, in this embodiment, since the rubbers 33, 34 are arranged so as to sandwich the support bracket 32, the vibrations of the vehicle body transmitted from the frame 5 can be sufficiently absorbed by the rubbers 33, 34.

In addition, this invention is not limited to the said embodiment. For example, in the above embodiment, in the metal plate 35, the plurality of projections 43 are arranged radially with respect to the cylindrical portion 42. As long as the notch 44 is defined, the shape is not particularly limited to such a form.

In the above-described embodiment, in the fastener 36 of the muffler support unit 7, the head 46a of the fastening bolt 46 is arranged above the rubber 34, and the nut 47 is arranged below the hanging bracket 31. The head 46 a of the fastening bolt 46 may be arranged below the suspension bracket 31 and the nut 47 may be arranged above the rubber 34 without being limited to such a form. In this case, the retainer ring 48 may be used as a washer. The fastener 15 of the muffler support unit 6 is also the same.

Further, in the above embodiment, the metal plate 35 is made of stainless steel, but the material of the metal plate 35 is not particularly limited to stainless steel, and may be iron or the like.

Also, in the above embodiment, the muffler support unit 6 does not have the metal plate 35, but it is not particularly limited to such a form. Like the muffler support unit 7, the muffler support unit 6 may also have a structure having a metal plate 35. FIG.

In the above-described embodiment, in the muffler support unit 7, the rubber 33 is arranged in the region between the suspension bracket 31 and the support bracket 32, and the rubber 34 is arranged in the region on the opposite side of the suspension bracket 31 with respect to the support bracket 32. Although it is arranged, it is not particularly limited to such a form, and only the rubber 33 arranged between the suspension bracket 31 and the support bracket 32 may be provided. The same applies to the muffler support unit 6 as well.

Further, the muffler support structure of the above embodiment is the muffler support unit 7 that supports the muffler 4 provided with the SCR using HC as an additive to the frame 5. It is applicable if it is a structure that supports the The present invention can also be applied to an exhaust purification device for a gasoline engine.

4... Muffler, 5... Frame, 7... Muffler support unit (muffler support structure), 31... Hanging bracket (first bracket), 32... Support bracket (second bracket), 33, 34... Rubber, 35... Metal plate, 36...Fastener, 41...Bolt hole, 42...Cylindrical part, 43...Protrusion, 44...Notch, 46...Fastening bolt.

Claims (4)

In the muffler support structure that supports the muffler on the frame,
a first bracket connected to the muffler;
a second bracket coupled to the frame;
a rubber disposed at least between the first bracket and the second bracket;
a metal plate disposed between the first bracket and the rubber;
a fastener for fastening the rubber together with the metal plate to the first bracket and the second bracket;
The metal plate includes a cylindrical portion defining a bolt hole through which a fastening bolt of the fastener passes, and a plurality of bolts protruding from the cylindrical portion to the outer peripheral side of the metal plate and opened to the outer peripheral side of the metal plate. a muffler support structure having a plurality of projections defining cutouts. 2. The muffler support structure according to claim 1, wherein said plurality of projections are arranged radially with respect to said tubular portion. 3. The muffler support structure according to claim 1, wherein said metal plate is made of stainless steel. The number of said rubbers is two,
The two rubbers are arranged so as to sandwich the second bracket between a region between the first bracket and the second bracket and a region on the opposite side of the first bracket with respect to the second bracket. cage,
The muffler support structure according to any one of claims 1 to 3, wherein the fastener fastens the two rubbers together with the metal plate to the first bracket and the second bracket.

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