JP2018184927A - Support structure for exhaust purification system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support structure for an exhaust gas purification device capable of reducing the time and effort required for assembling the exhaust gas purification device and reducing the influence of variations among parts. SOLUTION: Regarding a support structure of an exhaust purification device that suspends and supports casings 5 and 6 containing purification materials 3 and 4 on both sides of a frame 10 of a vehicle, a first casing 5 is suspended on one side of the frame 10. A first hanging lower portion 19 for supporting the suspension and a second hanging lower portion 20 for suspending and supporting the second casing 6 on the other side of the frame 10 are provided in one hanging bracket 18, and the hanging bracket 18 is provided under the frame 10. Arrange so that it passes by the side. [Selection diagram] Fig. 1

Description

  The present invention relates to a structure for supporting an exhaust emission control device for a vehicle with respect to the vehicle.

  The exhaust gas exhausted from the engine contains particulate matter (Particulate Matter), NOx, etc., so the particulate filter, oxidation catalyst, selective reduction catalyst, etc. in the middle of the exhaust pipe through which the exhaust gas flows It has been practiced to purify exhaust gas with a purifying material.

  4 and 5 show an example of such an exhaust purification device. In the middle of the exhaust pipe 2 through which the exhaust gas 1 discharged from the engine circulates, the particulate filter 3 that collects the particulates in the exhaust gas 1, and NOx reacts with the reducing agent downstream of the particulate filter 3. The selective catalytic reduction catalyst 4 having the property of being able to be held is respectively held in parallel by the casings 5 and 6, and between the rear end portion of the particulate filter 3 and the front end portion of the selective catalytic reduction catalyst 4. The exhaust gas 1 discharged from the rear end portion of the particulate filter 3 is connected to the front end portion of the adjacent selective catalytic reduction catalyst 4 by being connected by the S-shaped connecting flow path 7 and folded forward. Yes. In addition to the two purification materials (the particulate filter 3 and the selective reduction catalyst 4), an unburned fuel in the exhaust gas 1 is disposed in the first stage in the first casing 5 in which the particulate filter 3 is held. An oxidation catalyst 8 for oxidizing the portion is provided.

  The communication channel 7 surrounds the rear end portion of the particulate filter 3 and causes the exhaust gas 1 immediately after exiting from the rear end portion to collide with the wall surface and collect the gas collecting chamber while changing the direction in a substantially perpendicular direction. 7A, a mixing pipe 7B for extracting the exhaust gas 1 collected in the gas collecting chamber 7A toward the front, and the exhaust gas 1 guided forward by the mixing pipe 7B to collide with the wall surface in a substantially perpendicular direction. A gas dispersion chamber 7C surrounding the front end portion is configured to form an S-shape so that the exhaust gas 1 can be dispersed while changing its direction and the dispersed exhaust gas 1 can be introduced into the front end portion of the selective catalytic reduction catalyst 4. . The gas collecting chamber 7A is equipped with a reducing agent addition device 9 for adding a reducing agent in a direction in which the exhaust gas 1 emitted from the outlet end of the particulate filter 3 is turned in a substantially perpendicular direction. .

  If such a configuration is adopted, particulates in the exhaust gas 1 are collected by the particulate filter 3, and the reducing agent is exhausted from the reducing agent addition device 9 in the middle of the connecting flow path 7 on the downstream side. As a result of being added to 1 and reacting with NOx in the exhaust gas 1 on the selective catalytic reduction catalyst 4, simultaneous reduction of particulates and NOx in the exhaust gas 1 is achieved.

  At this time, the exhaust gas 1 discharged from the rear end portion of the particulate filter 3 is folded forward by the connecting flow path 7 and then introduced into the front end portion of the adjacent selective catalytic reduction catalyst 4. The distance from the addition position of the reducing agent in the middle of the communication flow path 7 to the selective catalytic reduction catalyst 4 is ensured long, and the flow of the exhaust gas 1 is turned back to promote the mixing of the reducing agent and the exhaust gas 1. Figured.

  In addition, casings 5 and 6 containing the particulate filter 3 and the selective catalytic reduction catalyst 4 are respectively arranged in parallel, and a connecting flow path 7 is provided between the casings 5 and 6 along the casings 5 and 6. Since they are arranged, the overall configuration becomes compact, and the mountability on the vehicle is greatly improved.

  The exhaust purification apparatus as described above is attached to the frame 10 as shown in FIGS. 4 and 5, for example. The first casing 5 containing the particulate filter 3 is located inside the frame 10 in the left-right direction of the vehicle body, and the second casing 6 containing the selective catalytic reduction catalyst 4 is located outside the frame 10. Each is fixed to the frame 10.

  At the required positions on the surfaces of the casings 5 and 6, there are provided connecting flanges 11, 12, 13, and 14 that protrude upwardly in a plane perpendicular to the axial direction of the casings 5 and 6. Accordingly, the entire exhaust emission control device including the casings 5 and 6 is fixed so as to be suspended from the frame 10.

  As shown in FIG. 4, the frame 10 has a C-shape that includes an upper member 10 b and a lower member 10 c that extend in the horizontal direction above and below a vertical member 10 a that forms a surface along the vertical direction and extends in the front-rear direction of the vehicle. Steel material having a cross section. A first bracket 15 and a second bracket 16 are attached to both surfaces of the vertical member 10a so as to protrude to both sides of the frame 10, respectively.

  As shown in FIGS. 4 and 5, the first bracket 15 extends from the lower end of the fixing portion 15 a to the one side of the frame 10 while being bent from the lower end of the fixing portion 15 a. It is a plate-shaped member having an L-shaped cross section provided with a suspended portion 15b that forms a surface along the horizontal direction. As shown in FIG. 4, two first brackets 15 are provided with respect to the frame 10, and the suspension portion 15 b is positioned above each of the connecting flanges 11 and 12 protruding from the upper surface of the first casing 5. As shown in FIG. 5, the fixing portion 15 a is fastened to one side surface (inner surface 10 d) of the longitudinal member 10 a of the frame 10. The connecting flange 11 or the connecting flange 12 of the first casing 5 is suspended from the hanging portion 15 b via the hanging tool 17. Each hanging tool 17 includes an upper member 17a that forms a surface along the suspended portion 15b of the first bracket 15, and a vertical member 17b that forms a surface along the connecting flange 11 or the connecting flange 12. The first casing 5 is supported below the hanger 17 by being fastened to the hanging portion 15b and the connecting flange 11 or the connecting flange 12 being fastened to the vertical member 17b.

  Similarly, the second bracket 16 includes a fixing portion 16a that forms a surface along the vertical member 10a of the frame 10, and a surface that extends while bending from the lower end of the fixing portion 16a to the other side of the frame 10 along the horizontal direction. These are plate-like members having an L-shaped cross section with a suspended portion 16 b that is formed on the frame 10. Each second bracket 16 has a fixed portion 16a on the other surface (outer surface) of the vertical member 10a of the frame 10 so that the suspended portion 16b is positioned above each of the connecting flanges 13 and 14 protruding from the upper surface of the second casing 6. 10e). The connecting flange 13 or the connecting flange 14 of the second casing 6 is suspended from the hanging portion 16 b via a hanging tool 17.

  As a prior art document related to the support structure of this type of exhaust gas purification apparatus, for example, there is the following Patent Document 1.

JP 2017-25815 A

  4 and 5, the two casings 5 and 6 containing the purifying material are arranged on both sides of the frame 10 as described above. A first bracket 15 that supports one casing 5 and a second bracket 16 that supports the second casing 6 on the other side of the frame 10 are provided. When the exhaust purification device is assembled to the frame 10, for example, the casings 5 and 6 and the communication flow path 7 are assembled to each other and then held at a predetermined position with respect to the frame 10. The two brackets 15, 16 and the connecting flanges 11, 12, 13, 14 at the upper parts of the casings 5, 6 are connected by the lifting tool 17, and the first and second brackets 15, 16 are fastened to the frame 10. The procedure is taken.

  However, in the configuration in which the brackets are divided in this way, since the number of parts related to the suspension of the exhaust gas purification device is large, there is a large influence of the variation among the parts, and the positional deviation is likely to occur when the parts are assembled.

  Further, in recent years, the types and number of peripheral components such as sensors mounted on an exhaust emission control device are increasing due to demands for stricter regulations regarding exhaust gas emission. The addition of sensors is accompanied by the addition of parts such as pipes and protective covers attached around the sensors, which leads to an increase in labor for assembling the exhaust purification device.

  Although not shown in FIGS. 4 and 5, the peripheral components such as the sensor are often installed using the first bracket 15, the second bracket 16, etc. , The assembly order tends to be complicated between the parts such as the first bracket 15, the second bracket 16, and the hanger 17 and the peripheral parts. At this time, in the state where the casings 5 and 6 are arranged in the vicinity of the frame 10, the accessibility is poor when assembling the peripheral parts at a predetermined position around the exhaust gas purification device, and this causes a further increase in assembling work. It was.

  In view of such circumstances, the present invention intends to provide a support structure for an exhaust gas purification device that can reduce the time and effort of assembling the exhaust gas purification device and can reduce the influence of variations among components.

  The present invention relates to a support structure for an exhaust purification device that supports a casing containing a purification material by suspending it on both sides of a frame of a vehicle, and suspends a first casing on one side of the frame and supports the first suspension. One suspension bracket includes a lower portion and a second suspension portion for supporting the second casing by suspending on the other side of the frame, and the suspension bracket is disposed so as to pass under the frame. The present invention relates to a support structure for an exhaust purification device.

  Thus, in this way, since the whole exhaust gas purification device is made into a module including a suspension bracket and then assembled to the frame, the labor involved in the assembling work can be reduced. Also, the bracket for hanging the exhaust purification system is not divided on both sides of the frame, but the casing is supported on both sides of the frame with one hanging bracket, so it is easy to maintain the accuracy of parts and assembly , Misalignment is unlikely to occur during assembly.

  In the support structure for the exhaust gas purification apparatus of the present invention, it is preferable to set a wraparound portion that turns the frame downward between the first suspension portion and the second suspension portion in the suspension bracket. By doing so, the frame can be arranged at a position where it enters between the casings.

  In the support structure of the exhaust emission control device of the present invention, the frame has upper and lower members forming a surface along the horizontal direction at the upper and lower ends of a vertical member extending in the front-rear direction and forming a surface along the vertical direction. Each has a protruding C-shaped cross section, and it is preferable that the inner surface of the vertical member and the first hanging portion or the second hanging portion of the hanging bracket are connected by a reinforcing bracket. Thus, it is possible to easily secure the support strength between the frame and the suspension bracket. On the other hand, the step of assembling the suspension bracket to the exhaust purification device and the step of attaching the reinforcing bracket to the frame or the suspension bracket can be performed separately before and after the step of assembling the suspension bracket to the frame.

  In the support structure of the exhaust emission control device according to the present invention, the reinforcing bracket includes a fixing portion that forms a surface along the inner surface of the longitudinal member of the frame and is fastened to the inner surface; A support section that is fastened to the first suspension section or the second suspension section in a plane along two suspension sections, and is provided on the reinforcement bracket and the frame at a fastening surface between the fixing section of the reinforcement bracket and the frame. Each of the fastening holes provided, and among the fastening holes provided in the reinforcing bracket and the suspension bracket on the fastening surface of the support portion of the reinforcement bracket and the suspension bracket, at least three sets of fastening holes are long holes, With respect to the fastening hole that is the elongated hole, by setting each direction so as to include all components in the vertical and longitudinal and lateral directions in the three-dimensional space, the reinforcing bracket is Ri Upon assembling the bracket and the frame can be configured that can absorb a positional deviation between the hanging bracket and the frame.

  According to the support structure of the exhaust emission control device of the present invention, the following various excellent effects can be obtained.

  (I) According to the invention described in claim 1 of the present invention, it is possible to reduce time and effort in assembling the exhaust gas purification device and to reduce the influence of variations among components.

  (II) According to the invention described in claim 2 of the present invention, since the frame can be disposed at a position where it enters between the casings, the entire exhaust gas purification device is disposed at a position closer to the frame, Mountability can be improved.

  (III) According to the invention described in claim 3 of the present invention, the support strength between the frame and the suspension bracket can be easily secured, while the module in which the suspension bracket is attached to the exhaust purification device is attached to the frame. The reinforcement bracket does not get in the way of assembly.

  (IV) According to the invention described in claim 4 of the present invention, when the suspension bracket is assembled to the frame, the vertical and front / rear / left / right misalignments caused by variations in the accuracy of parts and assembly are Can be absorbed by adjusting the position.

It is a disassembled perspective view explaining the support structure of the exhaust gas purification apparatus by the Example of this invention. It is sectional drawing explaining the support structure of the exhaust gas purification apparatus by the Example of this invention. It is a perspective view which shows the shape of the suspension bracket in the Example of this invention. It is a disassembled perspective view explaining the support structure of the conventional exhaust gas purification apparatus. It is sectional drawing explaining the support structure of the conventional exhaust gas purification apparatus.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 3 show an example of a support structure for an exhaust emission control device according to an embodiment of the present invention. The basic configuration is the same as that of the conventional example shown in FIGS. 4 and 5 described above, but in the case of the present embodiment, the suspended portion 15b of the first bracket 15 and the second bracket 16 in the conventional example are suspended. A feature is that a member corresponding to the lower portion 16b (see FIGS. 4 and 5) is provided in one suspension bracket 18.

  In the present embodiment, as shown in FIG. 1, the exhaust emission control device includes a particulate filter 3 and a selective catalytic reduction catalyst 4 in the first casing 5 and the exhaust pipe 2 through which the exhaust gas 1 discharged from the engine flows. Each of the second casings 6 is held in parallel and arranged in parallel, and the exhaust passage is configured by connecting the rear end portion of the particulate filter 3 and the front end portion of the selective catalytic reduction catalyst 4 by a communication passage 7. doing. An oxidation catalyst 8 is provided in the previous stage in the first casing 5 in which the particulate filter 3 is held.

  The communication flow path 7 has an S-shaped structure composed of a gas collecting chamber 7A, a mixing pipe 7B, and a gas dispersion chamber 7C, and the gas collecting chamber 7A exits from the outlet end of the particulate filter 3. A reducing agent addition device 9 is provided for adding a reducing agent in a direction in which the exhaust gas 1 is turned in a substantially perpendicular direction.

  The exhaust purification apparatus configured to include the casings 5 and 6 and the communication flow path 7 is attached to the frame 10 as a whole in such a manner that the casings 5 and 6 are suspended from both sides of the frame 10. The first casing 5 containing the particulate filter 3 is located inside the frame 10 in the left-right direction of the vehicle body, and the second casing 6 containing the selective catalytic reduction catalyst 4 is located outside the frame 10. Each is fixed to the frame 10. The frame 10 is provided with an upper member 10b and a lower member 10c projecting in a horizontal direction at the upper and lower ends of a vertical member 10a extending in the longitudinal direction of the vehicle and forming a surface along the vertical direction. It is a steel material having a C-shaped cross section. Hereinafter, of the surfaces formed by the vertical members 10a of the frame 10, the surface on which the upper member 10b and the lower member 10c protrude is referred to as an inner surface 10d, and the surface opposite to the inner surface 10d is referred to as an outer surface 10e. And For convenience of explanation, the direction in the space is defined below along the direction of the frame 10, the extending direction of the frame 10 is the front-rear direction, the horizontal direction orthogonal to the front-rear direction is the left-right direction, and the direction along the gravity is up and down. It shall be called a direction.

  At required positions on the surfaces of the casings 5 and 6, there are provided connecting flanges 11, 12, 13, and 14 that protrude upwardly in a plane perpendicular to the axial direction of the casings 5 and 6. , 12 are installed in the first casing 5, and the connecting flanges 13, 14 are installed in the second casing 6. Through these four connecting flanges, the entire exhaust gas purification apparatus including the casings 5 and 6 is fixed so as to be suspended from the frame 10.

  In the case of this embodiment, the connection flange 11 of the first casing 5 and the connection flange 13 of the second casing 6 are supported on the frame 10 by a single suspension bracket 18, and the connection flange 12 of the first casing 5 The connecting flange 14 of the second casing 6 is supported on the frame 10 by a separate suspension bracket 18.

  Each suspension bracket 18 includes a first suspension 19 projecting from the frame 10 upward in the horizontal direction toward the upper side of the first casing 5, and a second casing opposite to the first suspension 19 from the frame 10. 6 and a second suspended portion 20 that protrudes in a horizontal direction toward the upper side of 6.

  That is, the suspension bracket 18 is installed so as to straddle the frame 10 with the first suspension 19 located on one side of the frame 10 and the second suspension 20 located on the other side. The suspension bracket 18 is arranged with respect to the frame 10 so as to pass through the lower side of the frame 10 between the first suspension portion 19 and the second suspension portion 20. A wraparound portion 21 is formed at a portion where the frame 10 is positioned so as to wrap around the frame 10 downward. Thus, the suspension bracket 18 connects the first suspension portion 19 and the second suspension portion 20 while surrounding the lower portion of the frame 10 with the wraparound portion 21.

  The wraparound portion 21 has a U-shaped cross-sectional shape as shown in FIGS. 1 and 2, and includes a first side surface 21 a extending downward from an end portion of the first suspended portion 19 immediately adjacent to the frame 10, and a lower portion of the frame 10. The bottom surface 21b is disposed along the lower surface of the material 10c, and the second side surface 21c extends downward from the end of the second suspension 20 near the frame 10 and forms a surface along the vertical material 10a. The The second side surface 21 c forms a fastening surface that is fastened to the vertical member 10 a of the frame 10. Although it is not impossible to fasten the bottom surface 21b of the wraparound portion 21 to the bottom member 10c of the frame 10 from the viewpoint of connection strength, the fastening surface is a vertical member 10a. It is preferable to set the second side surface 21c which is a surface along the line.

  The connection flanges 11 and 12 of the first casing 5 or the connection flanges 13 and 14 of the second casing 6 are connected to the first and second suspension parts 19 and 20 of the suspension brackets 18 via a suspension 17. Each hanging tool 17 includes an upper member 17a that forms a surface along the first or second hanging portions 19 and 20, and a vertical member 17b that forms a surface along each of the connecting flanges. The casings 5 and 6 are supported below the hanger 17 by being fastened to the first hanger 19 or the second hanger 20 and fastening the connecting flanges to the vertical member 17b. Thus, the first casing 5 is suspended from one side of the frame 10 by the first suspension 19, and the second casing 6 is suspended from the other side of the frame 10 by the second suspension 20.

  In the case of this embodiment, the inner surface 10d of the vertical member 10a and the first suspended portion 19 are connected by the reinforcing bracket 22 so as to ensure the strength when the suspension bracket 18 supports the exhaust purification device. ing.

  As shown in FIG. 1, the reinforcement bracket 22 extends while being bent from the lower end of the fixing portion 22 a to the first suspension portion 19 of the suspension bracket 18 from the fixing portion 22 a that forms a surface along the vertical member 10 a of the frame 10. It is a plate-like member having an L-shaped cross section provided with a support portion 22b that forms a surface along the horizontal direction. As shown in FIG. 2, the fixing portion 22 a is fastened to the inner surface 10 d of the longitudinal member 10 a, and the support portion 22 b is fastened to the first hanging portion 19 of the hanging bracket 18. Here, the first suspended portion 19 is fixed to the inner surface 10d of the longitudinal member 10a via the reinforcing bracket 22, and the second side surface 21c located on the second suspended portion 20 side of the wraparound portion 21 is the outer surface of the longitudinal member 10a. The case of being fixed to 10e has been described as an example, but the direction of the frame 10 or the suspension bracket 18 is reversed in the left-right direction from the example shown in FIGS. 1 and 2, and the first side surface 21a is on the outer surface 10e of the vertical member 10a. The second suspended portion 20 may be fixed to the inner surface 10d of the longitudinal member 10a via the reinforcing bracket 22.

  Here, two sets of fastening surfaces between the reinforcing bracket 22 and the frame 10 and the suspension bracket 18, that is, a fixing portion 22 a of the reinforcing bracket 22, a vertical member 10 a of the frame 10, and a supporting portion 22 b of the reinforcing bracket 22. A total of four sets of fastening holes 22c, 10f, 22d, and 19a for fastening are opened in the first hanging portion 19 of the suspension bracket 18, and at least three of the fastening holes are different from each other. It is formed as a long hole that has a direction. By so doing, when the reinforcing bracket 22 is assembled to the frame 10 and the suspension bracket 18, it is possible to absorb the deviation generated between the frame 10 and the suspension bracket 18 at the respective fastening holes.

  Specifically, for example, as shown in FIG. 1, the fastening hole 22c opened in the fixing portion 22a is a long hole whose longitudinal direction is the direction along the vertical direction, and the fastening hole 22d opened in the support portion 22b is in the left-right direction. Let it be a long hole whose longitudinal direction is the direction along. Furthermore, the fastening hole 19a opened in the first suspended portion 19 is configured as a long hole whose longitudinal direction is the direction along the front-rear direction. In this way, when the suspension bracket 18 is assembled to the frame 10, a positional shift caused by variations in parts and assembly accuracy is caused by the fastening position between the fastening hole 10 f and the fastening hole 22 c, and the fastening hole 19 a. It can be absorbed by adjusting the fastening position between the fastening holes 22d.

  For example, when there is a vertical displacement between the frame 10 and the suspension bracket 18, a fastening hole 22 c that is a long hole in the vertical direction provided in the fixing portion 22 a of the reinforcing bracket 22 and a vertical member 10 a of the frame 10. The vertical position of the reinforcing bracket 22 with respect to the suspension bracket 18 is adjusted by adjusting the vertical positional relationship with the fastening hole 10f provided in the support hole 22f, and the support portion 22b is in contact with the upper surface of the first suspension portion 19. The frame 10 and the reinforcing bracket 22 can be fastened with the vertical member 10a and the fixing portion 22a while being arranged in this manner. Further, there may be a shift in the front-rear and left-right directions between the frame 10 and the suspension bracket 18, and in this case, a fastening hole that is a long hole in the left-right direction provided in the support portion 22 b of the reinforcement bracket 22. If a fastener such as a bolt is used at the intersection between 22d and a fastening hole 19a, which is a long hole in the front-rear direction, provided in the first suspension part 19 of the suspension bracket 18, the front and rear between the frame 10 and the suspension bracket 18 Even if there is a shift in the right and left, the fastening between the reinforcing bracket 22 and the suspension bracket 18 can be performed without delay.

  Here, the selection of which one of the fastening holes is an elongated hole and the setting of the direction of each elongated hole are not limited to the above combinations. However, in order to absorb misalignment in all directions, up and down, front and rear, left and right, the direction of the fastening hole set as a long hole is a component of all three axes of the upper and lower, front and rear, left and right in a three-dimensional space as a whole. It is necessary to contain. In the case of the example shown in FIGS. 1 and 2, of the four sets of fastening holes, any of the fastening holes 10f and 22c is set as an elongated hole along the vertical direction, and any of the fastening holes 19a and 22d. Is set as a long hole along the left-right direction, and any of the remaining two sets of fastening holes may be set as a long hole along the front-rear direction.

  The reinforcing bracket 22 may be configured to have, for example, a surface along the vertical member 10a of the frame 10 and a surface along the first side surface 21a of the wraparound portion 21 of the suspension bracket 18, In this case, in the state where the suspension bracket 18 is assembled to the frame 10, the width in the left-right direction of the reinforcing bracket 22 needs to be exactly the same as the distance between the vertical member 10a and the first side surface 21a. A relatively high accuracy is required for assembly. Further, in this case, neither the fastening surface between the reinforcing bracket 22 and the frame 10 nor the fastening surface between the reinforcing bracket 22 and the suspension bracket 18 have a horizontal direction. Absorption of misalignment due to long holes cannot be absorbed. Therefore, it can be said that it is preferable that the reinforcing bracket 22 has an L-shaped cross section by the fixing portion 22a and the support portion 22b as described above.

  As shown in FIGS. 2 and 3, the wraparound portion 21 of the suspension bracket 18 is provided with reinforcing ribs 23 on the outside of the bottom surface 21 b and the second side surface 21 c, that is, on the surface not in contact with the frame 10. The reinforcing rib 23 is a rib provided from the second side surface 21c to the bottom surface 21b so as to protrude from the second side surface 21c or the bottom surface 21b along the vertical direction of the second side surface 21c and the horizontal direction of the bottom surface 21b. Thus, the rigidity of the wraparound portion 21 is increased. The reinforcing rib 23 can be formed integrally with a material constituting the wraparound portion 21, or can be formed as a member separate from the suspension bracket 18 and assembled to the wraparound portion 21. The mounting position of the reinforcing rib 23 is not limited to the second side surface 21c and the bottom surface 21b. For example, the reinforcing rib 23 may be provided from the first side surface 21a to the bottom surface 21b, or from the first side surface 21a to the bottom surface 21b. It may be provided to reach 21c. For example, one reinforcing rib 23 may be provided from the second side surface 21c to the bottom surface 21b, and another reinforcing rib 23 may be provided from the first side surface 21a to the bottom surface 21b.

  When the exhaust purification device is assembled to the frame 10 with the suspension bracket 18 and the reinforcement bracket 22 as described above, two pieces are connected to the connection flanges 11, 12, 13, 14 of the casings 5, 6 via the suspension 17. After the suspension bracket 18 is connected, the entire exhaust gas purification apparatus including the casings 5 and 6 and the communication flow path 7 is disposed at a predetermined position with respect to the frame 10, and the second of the wraparound portion 21 of the suspension bracket 18 is arranged. The side surface 21 c may be fastened to the vertical member 10 a of the frame 10, and the reinforcing bracket 22 may be fastened to the vertical member 10 a of the frame 10 and the first suspended portion 19 of the suspension bracket 18.

  In this manner, the suspension bracket 18 is assembled to the casings 5 and 6, and the entire exhaust gas purification apparatus including the casings 5 and 6 and the communication flow path 7 is made into a module including the suspension bracket 18 and is attached to the frame 10. Will be assembled. In other words, when the suspension bracket 18 is used to attach peripheral components such as sensors to the exhaust gas purification device, the peripheral components can also be assembled to the frame 10 after being attached to the exhaust gas purification device. Therefore, for example, after the casings 5 and 6 are arranged at predetermined positions in the vicinity of the frame 10, the work of assembling the hanging bracket 18 and the hanging tool 17 and the peripheral parts in a complicated procedure is unnecessary. Since the peripheral parts can be assembled to the exhaust gas purification device in a state where the casings 5 and 6 are not arranged in the vicinity of the frame 10 and have good accessibility, the labor involved in the assembling work can be significantly reduced.

  Here, when the suspension bracket 18 as described above is attached to the frame 10 having a C-shaped cross section, a part of the suspension bracket 18 (the second side surface 21c of the wraparound portion 21) is attached to the outer surface 10e of the longitudinal member 10a. Therefore, the suspension bracket 18 can be directly fastened to the vertical member 10a at the outer surface 10e. Therefore, the supporting strength on the second suspended portion 20 side can be ensured relatively easily. On the other hand, with respect to the first suspended portion 19 side, the inner surface 10d of the vertical member 10a is separated from the constituent members of the suspended bracket 18 by the width of the lower member 10c. It is difficult to fasten directly to the vertical member 10a. Therefore, in the present embodiment, the reinforcing bracket 22 is used to connect the inner surface 10d of the vertical member 10a and the first hanging portion 19 of the hanging bracket 18 so that the first hanging portion 19 side is also connected. Necessary supporting strength can be obtained. Since the reinforcement bracket 22 is configured as a member different from the suspension bracket 18, the reinforcement bracket 22 becomes an obstacle when the module in which the suspension bracket 18 is attached to the exhaust purification device is assembled to the frame 10 as described above. There is no. This is because the step of assembling the suspension bracket 18 to the exhaust purification device and the step of attaching the reinforcing bracket 22 to the frame 10 or the suspension bracket 18 can be performed separately before and after the step of assembling the suspension bracket 18 to the frame 10.

  In the present embodiment, the suspension bracket 17 is provided to connect the suspension bracket 18 and the coupling flanges 11, 12, 13, and 14 of the casings 5 and 6, and the configuration of such a suspension 17 is the present invention. For example, a member corresponding to the hanger 17 may be integrally formed on the hanger bracket 18 or the connecting flanges 11, 12, 13, and 14 side.

  Further, in this embodiment, the bracket for suspending the exhaust purification device is not divided on both sides of the frame 10, but one suspension bracket 18 is arranged so as to straddle the frame 10, and the casing 5 is disposed on both sides of the frame 10. , 6 are supported. In this way, compared to the case where the bracket is divided on both sides of the frame 10 and each of the casings 5 and 6 is supported, the accuracy of parts and assembly can be easily maintained, and positional displacement is unlikely to occur during assembly. .

  Here, in the present embodiment, the wraparound portion 21 is set at a position corresponding to the frame 10 of the suspension bracket 18 and is arranged to wrap downward with respect to the frame 10. It is not necessarily essential for implementation. For example, the same surface can be formed from the first suspending portion 19 to the second suspending portion 20, and even in such a case, the above-described operational effect of improving assemblability by modularization can be obtained. Can do. In that case, for example, a bracket (corresponding to the reinforcing bracket 22) for connecting the first suspended portion 19 and the inner surface 10d of the longitudinal member 10a of the frame 10 is provided, while the second suspended portion 20 and the outer surface of the longitudinal member 10a are provided. If an L-shaped cross-section bracket or the like for connecting to 10e is provided, there is no particular problem in supporting the suspension bracket 18 on the frame 10. However, when the sneak portion 21 is set as in the above-described embodiment, the frame 10 is disposed at a position where the frame 10 is inserted between the left and right casings 5 and 6, and the entire exhaust purification device is positioned closer to the frame 10. Since it can be disposed in, it is excellent in terms of mountability. The rigidity of the wraparound portion 21 can be supplemented by the reinforcing bracket 22 and the reinforcing rib 23.

  As described above, the present embodiment relates to the support structure of the exhaust purification device that supports the casings 5 and 6 containing the purification materials 3, 4, 8 by suspending them on both sides of the vehicle frame 10. One suspension bracket 18 is provided with a first suspension 19 that suspends and supports the first casing 5 on one side and a second suspension 20 that suspends and supports the second casing 6 on the other side of the frame 10. The suspension bracket 18 is disposed so as to pass below the frame 10. Since the entire exhaust emission control device is made into a module including the suspension bracket 18 and then assembled to the frame 10, the labor involved in the assembling work can be reduced. In addition, since the bracket for suspending the exhaust purification device is not divided on both sides of the frame 10, the casings 5 and 6 are supported on both sides of the frame 10 by one suspension bracket 18. Therefore, it is easy to maintain the accuracy, and variations are less likely to occur during assembly.

  Further, in the present embodiment, the wraparound portion 21 that turns the frame 10 downward is set between the first suspending portion 19 and the second suspending portion 20 in the suspending bracket 18. , 6 is arranged at a position between the two. Therefore, the entire exhaust gas purification device can be arranged at a position closer to the frame 10 to improve the mountability.

  Further, in the present embodiment, the frame 10 has an upper member 10b and a lower member 10c that form a surface along the horizontal direction at the upper end and the lower end of the longitudinal member 10a that forms a surface along the vertical direction and extends in the front-rear direction, respectively. Since the inner surface 10d of the vertical member 10a is connected to the first suspending portion 19 or the second suspending portion 20 of the suspension bracket 18 by the reinforcing bracket 22, the frame 10 has a protruding C-shaped cross section. The supporting strength between the suspension bracket 18 and the suspension bracket 18 can be easily ensured. In addition, the process of assembling the suspension bracket 18 to the exhaust purification device and the process of attaching the reinforcing bracket 22 to the frame 10 or the suspension bracket 18 can be executed separately before and after the process of assembling the suspension bracket 18 to the frame 10. The reinforcing bracket 22 does not get in the way of assembling the module with the exhaust gas purifier attached to the frame 10.

  Further, in this embodiment, the reinforcing bracket 22 includes a fixing portion 22a that forms a surface along the inner surface 10d of the longitudinal member 10a of the frame 10 and is fastened to the inner surface 10d, and the first suspended portion 19 of the suspension bracket 18 or A support portion 22b that is fastened to the first suspension portion 19 or the second suspension portion 20 in a plane along the second suspension portion 20 is provided, and reinforcement is provided at the fastening surface between the fixing portion 22a of the reinforcement bracket 22 and the frame 10. Fastening holes 22c and 10f provided in the bracket 22 and the frame 10 respectively, and fastening holes 22d and 19a provided in the reinforcing bracket 22 and the hanging bracket 18 on the fastening surface between the support portion 22b of the reinforcing bracket 22 and the hanging bracket 18 respectively. Of these, at least three sets of fastening holes are elongated holes, and the fastening holes, which are the elongated holes, are vertically and longitudinally and laterally in the three-dimensional space. Since the respective orientations are set so as to include all components, the positional deviation between the suspension bracket 18 and the frame 10 can be absorbed when the reinforcement bracket 22 is assembled to the suspension bracket 18 and the frame 10. When the suspension bracket 18 is assembled to the frame 10, the positional deviation in the vertical and front / rear / left / right directions caused by variations in parts and assembly accuracy can be absorbed by adjusting the positions of the fastening holes.

  Therefore, according to the present embodiment, it is possible to reduce time and effort in assembling the exhaust purification device and to reduce the influence of variations among components.

  The support structure of the exhaust emission control device of the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention.

3 Purification material (particulate filter)
4 Purification material (selective reduction catalyst)
5 Casing (first casing)
6 Casing (second casing)
8 Purification material (oxidation catalyst)
DESCRIPTION OF SYMBOLS 10 Frame 10a Vertical member 10b Upper member 10c Lower member 10d Inner surface 10f Fastening hole 18 Hanging bracket 19 First hanging portion 19a Fastening hole 20 Second hanging portion 21 Rounding portion 22 Reinforcement bracket 22a Fixing portion 22b Support portion 22c Fastening hole 22d Fastening hole

Claims (4)

  A support structure of an exhaust purification device that supports a casing containing a purification material by hanging it on both sides of a frame of a vehicle, the first hanging portion for hanging and supporting a first casing on one side of the frame, An exhaust emission control device comprising: a second suspension lower portion that suspends and supports the second casing on the other side of the frame; and a suspension bracket that is disposed so as to pass through the lower side of the frame. Support structure.   The support structure of the exhaust emission control device according to claim 1, wherein a wraparound portion is provided between the first suspension portion and the second suspension portion of the suspension bracket so as to turn the frame downward.   The frame has a C-shaped cross section in which an upper member and a lower member that form a surface along the horizontal direction protrude from the upper end and the lower end of a longitudinal member that forms a surface along the vertical direction and extend in the front-rear direction. The support structure of the exhaust emission control device according to claim 1 or 2, wherein an inner surface of the vertical member and the first hanging portion or the second hanging portion of the hanging bracket are connected by a reinforcing bracket. . The reinforcing bracket includes a fixed portion that is fastened to the inner surface of the frame along the inner surface of the vertical member, and a surface that extends along the first hanging portion or the second hanging portion of the hanging bracket. Comprising a support portion fastened to the first suspended portion or the second suspended portion;
Fastening holes provided in the reinforcing bracket and the frame at the fastening surface between the fixing portion of the reinforcing bracket and the frame, and the reinforcing bracket and the suspension at the fastening surface between the support portion of the reinforcing bracket and the suspension bracket. Among the fastening holes provided in each bracket, at least three sets of fastening holes are elongated holes, and the respective orientations are set so as to include all the components in the three-dimensional space in the vertical and forward / backward / left / right directions. Thus, in assembling the reinforcing bracket to the suspension bracket and the frame, it is configured to be able to absorb a positional shift between the suspension bracket and the frame. Support structure for exhaust purification system.

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