JP7375700B2 - Mounting structure of exhaust purification device - Google Patents

Description

The present invention relates to a mounting structure for an exhaust purification device installed in an exhaust passage of an internal combustion engine.

BACKGROUND ART Conventionally, a mounting structure is known in which a flange is formed at a joint between an exhaust passage of an internal combustion engine and an exhaust gas purification device, and the flanges are fixed using a fastener in a state where they butt each other. For example, there is a structure in which a stud bolt is erected on one flange, passed through an insertion hole in the other flange, and fastened and fixed by threading a nut onto the stud bolt. Furthermore, a structure has been proposed in which a notch that engages with a stud bolt is formed instead of an insertion hole so that the flange can be guided to the correct position while rotating in an arc shape (for example, see Patent Document 1).

Japanese Patent Application Publication No. 2019-002295

On the other hand, the heat generated by the exhaust gas purification device may cause thermal deformation or loosening of the parts fixed by the fasteners, making the installation state unstable. In particular, when a catalyst device, a filter, etc. that purify exhaust gas are placed close to the flange, the influence of heat on the fastener becomes large, and it may be difficult to stabilize the attachment state.

One of the purposes of this invention was created in light of the above-mentioned issues, and is to provide a mounting structure for an exhaust purification device that can improve the installation condition of the exhaust purification device with a simple configuration. be. In addition, this purpose is not limited to this purpose, and it is also possible to achieve effects derived from each configuration shown in "Details for Carrying Out the Invention" that will be described later, which cannot be obtained with conventional techniques. It can be positioned as a purpose.

The disclosed structure is a mounting structure for an exhaust purification device that is installed in an exhaust passage of an internal combustion engine, and includes a purification part that purifies exhaust gas discharged from the internal combustion engine, and a purification part that extends from the purification part and is connected to the exhaust passage. It includes a passage part and a pair of flanges formed in a shape expanded in a direction intersecting the flow direction of exhaust gas at a joint between the exhaust passage and the passage part. The pair of flanges includes a shaft-shaped fastener fixed to one of the flanges, and a hook-shaped hook that engages with the fastener on the other of the flanges and opens toward the purification section. It has a section.

According to the disclosed mounting structure for an exhaust purification device, the mounting condition can be improved with a simple configuration.

FIG. 2 is a schematic diagram showing a mounting structure of an exhaust gas purification device as an example. FIG. 2 is a schematic diagram showing an enlarged upper part of the exhaust gas purification device shown in FIG. 1. FIG. FIG. 2 is a schematic diagram showing an enlarged lower part of the exhaust gas purification device shown in FIG. 1. FIG.

[1. composition]
An exhaust purification device 1 shown in FIG. 1 is installed in an exhaust passage of an internal combustion engine 10 such as a gasoline engine or a diesel engine, for example. As shown in FIG. 1, the internal combustion engine 10 is mounted in the engine compartment of a vehicle with the upper part inclined more toward the rear of the vehicle than the lower part (backward inclined attitude). The exhaust gas purification device 1 is arranged behind the internal combustion engine 10 in the vehicle.

The exhaust purification device 1 is provided with a purification section 3 and passage sections 4 and 14. The purification unit 3 is a part in which a catalyst device, a filter, and the like that purify exhaust gas discharged from the internal combustion engine 10 are incorporated. The passage parts 4 and 14 are tubular parts extending from the purification part 3 and connected to the exhaust passages 2 and 12. In FIG. 1, a passage section 4 extends above the purification section 3, and another passage section 14 extends below the purification section 3. Exhaust gas is introduced from the internal combustion engine 10 into the purification section 3 through the exhaust passage 2 and the passage section 4, and then through the passage section 14 and the exhaust passage 12. In the present embodiment, the exhaust passage 12 is an EGR passage that introduces exhaust gas into the intake passage, and the exhaust passage 12 is an EGR passage that introduces exhaust gas into the intake passage. A passage 19 for discharging to the outside is connected.

Regarding the structure above the purification part 3, the passage part 4 is joined to the exhaust passage 2 from the vehicle width direction. As shown in FIG. 2, a pair of flanges 5 are formed at the joint between the exhaust passage 2 and the passage portion 4. One of the pair of flanges 5 is provided on the exhaust passage 2 side, and the other is provided on the passage portion 4 side. These flanges 5 are formed into a planar shape with their joints expanded in a direction perpendicular to the flow direction of exhaust gas, and are fixed in a state where the flanges 5 are butted against each other. The pair of flanges 5 are oriented such that their surfaces face in the vehicle width direction. Note that a gasket or a seal member may be interposed between these flanges 5 to prevent leakage of exhaust gas.

A shaft-shaped fastener 6 is fixed to one of the pair of flanges 5 . The fastener 6 is a cylindrical or cylindrical member having a threaded groove on its outer circumferential surface, such as a bolt, stud bolt, or full screw. On the other hand, the other of the pair of flanges 5 is provided with a hook-shaped portion 7 that engages with the fastener 6. The shape of the hook-shaped portion 7 is formed into a hook-shape (U-shape) that is open toward the purifying portion 3 side, as shown in FIGS. 1 and 2. The shape of the hook-shaped portion 7 is similar to a shape obtained by cutting out a portion of the periphery of the hole into which the fastener 6 is inserted up to the outer edge of the flange 5. In this way, by forming the hook shape with the side closer to the purification section 3 open, thermal deformation of the flange 5 and loosening of the fasteners 6 are less likely to occur, and the mounting condition of the exhaust gas purification device 1 is improved.

The hook-shaped portion 7 shown in FIG. 2 is formed in a hook shape with an open lower side with respect to the axis of the fastener 6. The purifying section 3 is arranged below the flange 5. Further, the opening direction of the hook-shaped portion 7 is set to be inclined with respect to the vertical direction when the exhaust purification device 1 is attached to the exhaust passage 2. As shown in FIG. 2, if the opening angle θ of the hook-shaped portion 7 is defined with reference to the vertically downward direction from the axis of the fastener 6, the opening angle θ will be within the range of 0 to 90 degrees. Further, the opening direction of the hook-shaped portion 7 is a direction that is inclined so that the lower side approaches the internal combustion engine 10 when the exhaust purification device 1 is attached to the exhaust passage 2 (a direction along the backward tilted posture of the internal combustion engine 10). ).

The flange 5 shown in FIG. 2 is provided with two fasteners 6 and two hook-shaped portions 7 that engage with each fastener 6. The opening angle θ of each hook-shaped portion 7 is set to the same value. Therefore, the opening directions of the two hook-shaped portions 7 are parallel. When connecting the exhaust purification device 1 to the exhaust passage 2, the two hook-shaped portions 7 are simultaneously engaged with the fasteners 6 by moving the exhaust purification device 1 along the opening direction of the hook-shaped portions 7. Easy to operate. A nut 11 is attached to the fastener 6 that has engaged with the hook-shaped portion 7, and the pair of flanges 5 are fastened and fixed.

Further, at least one of the pair of flanges 5 is provided with a fastening hole 9 through which the second fastener 8 is inserted. The second fastener 8 is, for example, a bolt, a stud bolt, a full screw, or the like. The second fastener 8 may be fixed to one of the pair of flanges 5 in the same way as the fastener 6. Alternatively, a fastening hole 9 may also be bored in one of the pair of flanges 5, and the second fastener 8 may be inserted therethrough, and the pair of flanges 5 may be fixed by tightening nuts 11 from both sides.

As shown in FIG. 1, the second fastener 8 and the fastening hole 9 are arranged at the farthest position from the purifying section 3 compared to the fastener 6 and the hook-shaped part 7. In other words, the hook-shaped part 7 is arranged closer to the purifying part 3 compared to the fastening hole 9. In this way, by arranging the hook-shaped part 7, which is open on the side closer to the purification part 3, close to the purification part 3, the influence of heat on the second fastener 8 and the fastening hole 9 is reduced, and the exhaust gas is purified. The installation condition of the device 1 is improved.

Regarding the structure below the purification part 3, the passage part 14 extends in the vehicle width direction and is joined to the exhaust passage 12. As shown in FIG. 3, a pair of flanges 15 are formed at the joint between the exhaust passage 12 and the passage portion 14. One of the pair of flanges 15 is provided on the exhaust passage 12 side, and the other is provided on the passage portion 14 side. These flanges 15 are formed in a planar shape with their joint portions expanded in a direction substantially perpendicular to the flow direction of exhaust gas, and are fixed in a state where the flanges 15 are butted against each other.

Two shaft-shaped fasteners 16 are fixed to one of the pair of flanges 15 . On the other hand, the other of the pair of flanges 15 is provided with two hook-shaped portions 17 that engage with fasteners 16 . As shown in FIGS. 1 and 3, the hook-shaped portion 17 is formed in a hook-shape (U-shape) that is open toward the purifying portion 3 side. In this embodiment, the hook-shaped portion 17 is opened toward the internal combustion engine 10 side, that is, toward the front of the vehicle, so that when an external force is applied to the internal combustion engine 10 from the front of the vehicle, the fastener 16 and the hook-shaped portion 17 are opened. The engagement is difficult to disengage. In this way, by forming the hook shape with the side closer to the purification section 3 open, thermal deformation of the flange 15 and loosening of the fasteners 16 are less likely to occur, and the mounting condition of the exhaust gas purification device 1 is improved. A nut 18 is attached to the fastener 16 engaged with the hook-shaped portion 17, and the pair of flanges 15 are fastened and fixed.

[2. action, effect]
(1) In the mounting structure of the exhaust gas purification device 1 according to the above embodiment, the hook-shaped portions 7 and 17 that engage with the fasteners 6 and 16 are formed in a hook shape that opens toward the purification portion 3 side. be done. That is, the shapes of the hook-shaped parts 7 and 17 are such that the parts of the periphery of the fasteners 6 and 16 that are most likely to be affected by the heat transmitted from the purifying part 3 are cut out. With such a configuration, thermal deformation of the flanges 5 and 15 of the fasteners 6 and 16 on the purification part 3 side due to heat generated in the purification part 3 can be suppressed, and the thermal deformation of the flanges 5 and 15 causes the fasteners 6 to , 16 can be suppressed.

Therefore, the mounting condition of the exhaust purification device 1 can be improved. Further, for example, when fastening and fixing the flange 5, the two hook-shaped portions 7 can be simultaneously engaged with the fasteners 6 by simply sliding the flange 5, and correct positioning can be achieved. Therefore, the workability of installing the exhaust gas purification device 1 can be improved, the time required for the installation work can be shortened, and the difficulty level of the work can be lowered.

(2) In the above embodiment, the purification section 3 of the exhaust gas purification device 1 is located below the flange 5. Further, the hook-shaped portion 7 of the flange 5 is formed in a hook-shape with an open lower side where the purifying portion 3 is located. With such a configuration, the hook-shaped portion 7 can be easily hooked onto the fastener 6 by using the weight of the exhaust gas purification device 1, and the workability of installing the exhaust gas purification device 1 can be further improved. . Furthermore, it is possible to make the filter less susceptible to not only the influence of radiant heat emitted from the purifying section 3 but also the influence of convective heat transmitted through the air. Therefore, the influence of heat on the fastener 6 can be reduced, and the mounting state of the exhaust purification device 1 can be stabilized.

Further, since the hook-shaped portion 7 is fixed to the fastener 6 in a hook-like state, even if an external force is applied to the exhaust gas purification device 1, for example, the fastener 6 and the hook-shaped portion 7 will not be connected to each other. The engagement becomes difficult to disengage. Therefore, the position of the exhaust purification device 1 can be made difficult to shift during a vehicle collision, and contact and interference with the internal combustion engine 10 and auxiliary machinery arranged around it can be prevented. Therefore, damage and deformation of the exhaust gas purification device 1 and the internal combustion engine 10 can be suppressed, and protection performance can be improved. Furthermore, since the sliding direction when installing the exhaust purification device 1 is along the rear side of the internal combustion engine 10, the work space required for installation is small, further improving the workability of installing the exhaust purification device 1. can be done.

(3) In the above embodiment, the opening direction of the hook-shaped portion 7 is set to be inclined with respect to the vertical direction when the exhaust purification device 1 is attached to the exhaust passage 2. For example, the opening angle θ of the hook-shaped portion 7 shown in FIG. 2 is set within the range of “0<θ<90 [degrees]”. With such a configuration, the stability of the exhaust gas purification device 1 against vibrations of the vehicle body in the vertical vertical direction can be improved compared to a case where the hook-shaped portion 7 is opened in the vertical direction. Furthermore, the stability of the exhaust gas purification device 1 against body vibrations in the longitudinal direction of the vehicle can be improved compared to the case where the hook-shaped portion 7 is opened in the longitudinal direction of the vehicle. Therefore, the mounting state of the exhaust gas purification device 1 against vehicle body vibration can be stabilized.

(4) In the above embodiment, the exhaust passage 2 is located at the rear of the internal combustion engine 10. The passage portion 4 is attached to the exhaust passage 2 from the vehicle width direction, and the flange 5 has its surface facing the vehicle width direction. Further, the opening direction of the hook-shaped portion 7 is inclined so that the lower side approaches the internal combustion engine 10 when the exhaust gas purification device 1 is attached to the exhaust passage 2. With such a configuration, it is possible to improve the installation workability of the exhaust gas purification device 1, compared to, for example, a case where the opening direction of the hook-shaped portion 7 is inclined so that the lower side is further away from the internal combustion engine 10. Further, when an external force is applied to the internal combustion engine 10 from the front of the vehicle, the fastener 6 tends to move to the back of the hook-shaped portion 7, and the engagement between the fastener 6 and the hook-shaped portion 7 is interrupted. It becomes difficult to come off. Therefore, the mounting state of the exhaust gas purification device 1 can be stabilized at the time of a frontal collision of the vehicle.

(5) In the above embodiment, as shown in FIG. 2, a plurality of hook-shaped portions 7 are provided. With such a configuration, compared to the case where the number of hook-shaped parts 7 is one, it is possible to suppress rotational movement of the exhaust gas purification device 1 when the hook-shaped part 7 is hooked on the fastener 6, The posture of the exhaust gas purification device 1 when the hook-shaped portion 7 is hooked onto the fastener 6 can be fixed in the correct position. Therefore, for example, workability when tightening the nut 11 can be improved.

(6) In the above embodiment, as shown in FIG. 2, the opening directions of the plurality of hook-shaped portions 7 are parallel to each other. With such a configuration, it becomes easy to move the exhaust purification device 1 along the opening direction of the hook-shaped portions 7 and engage the plurality of hook-shaped portions 7 with the fasteners 6 at the same time. Therefore, the workability of installing the exhaust gas purification device 1 can be further improved.

(7) In the above embodiment, the fastening hole 9 is provided in the flange 5, as shown in FIG. Moreover, the hook-shaped part 7 is arranged closer to the purifying part 3 than the fastening hole 9. In this way, the influence of heat on the fastener 6 is reduced by arranging the hook-shaped part 7 near the purification part 3, which is susceptible to the influence of heat, and by arranging the fastening hole 9 at a position away from the purification part 3. At the same time, the fastening force of the second fastener 8 can be ensured, and the mounting state of the exhaust purification device 1 can be stabilized. Furthermore, by forming a bolt hole that does not cut out to the outer edge of the flange 5 like the fastening hole 9, it is possible to prevent the second fastener 8 from coming off, thereby further stabilizing the mounting state of the exhaust gas purification device 1. be able to.

[3. Modified example]
The above-described embodiments are merely illustrative, and there is no intention to exclude the application of various modifications and techniques not specified in the present embodiments. Each configuration of this embodiment can be modified and implemented in various ways without departing from the spirit thereof. Moreover, they can be selected or combined as necessary.

For example, in the above embodiment, the exhaust gas purification device 1 for the internal combustion engine 10 installed in a vehicle is described in detail, but the target for installing the internal combustion engine 10 to which the exhaust gas purification device 1 is applied is not limited to a vehicle. The above exhaust purification device 1 may be applied to an internal combustion engine 10 installed in a ship or an industrial facility. Further, the number and arrangement of the fasteners 6, 16 and the second fastener 8 may be changed, the shape and position of the hook-shaped portions 7, 17 may be changed, and the shape of the flanges 5, 15 may be changed. May be changed. By providing at least the hook-shaped portions 7 and 17 that are open toward the purification section 3 side of the exhaust gas purification device 1, the same functions and effects as in the above embodiment can be obtained.

1 Exhaust purification device 2 Exhaust passage 3 Purification part 4 Passage part 5 Flange 6 Fastener 7 Hook-shaped part 8 Second fastener 9 Fastening hole 10 Internal combustion engine 11 Nut 12 Exhaust passage 14 Passage part (EGR passage)
15 Flange 16 Fastener 17 Hook-shaped portion 18 Nut 19 Passage

Claims (7)

A mounting structure for an exhaust purification device installed in an exhaust passage of an internal combustion engine,
a purification unit that purifies exhaust gas discharged from the internal combustion engine;
a passage part extending from the purification part and connected to the exhaust passage;
a pair of flanges formed in a shape expanded in a direction intersecting the flow direction of the exhaust gas at a joint between the exhaust passage and the passage portion,
The pair of flanges include a shaft-shaped fastener fixed to one of the pair of flanges, and a hook-shaped fastener that engages with the fastener at the other of the pair of flanges and opens toward the purification section. 1. A mounting structure for an exhaust purification device, comprising a hook-shaped portion. the purification section is located below the flange,
2. The mounting structure for an exhaust gas purification device according to claim 1, wherein the hook-shaped portion is formed in a hook shape with a lower side open. The exhaust gas purification device according to claim 1 or 2, wherein the opening direction of the hook-shaped portion is a direction inclined with respect to a vertical direction when the exhaust gas purification device is attached to the exhaust passage. Mounting structure. The exhaust passage is located at the rear of the internal combustion engine,
The passage portion extends in the vehicle width direction and is joined to the exhaust passage,
The flange has its surface facing the vehicle width direction,
4. The exhaust gas according to claim 3, wherein the opening direction of the hook-shaped portion is a direction that is inclined so that the lower side approaches the internal combustion engine when the exhaust gas purification device is attached to the exhaust passage. Mounting structure of purifier. The mounting structure for an exhaust gas purification device according to claim 1, wherein the plurality of hook-shaped portions are provided on the other of the pair of flanges. 6. The mounting structure for an exhaust gas purification device according to claim 5, wherein the opening directions of the plurality of hook-shaped portions are parallel. comprising a fastening hole drilled in the pair of flanges and into which a second fastener for fastening the pair of flanges is inserted;
The mounting structure for an exhaust gas purification device according to any one of claims 1 to 6, wherein the hook-shaped portion is located closer to the purification portion than the fastening hole.

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