JP6731307B2 - Exhaust purification device mounting structure - Google Patents

Description

The present invention relates to an exhaust purification device mounting structure, and in particular, to an exhaust purification device that is equipped in a vehicle for transporting a work machine such as a rough terrain crane undercarriage and is effective for purifying the exhaust gas of an engine of a work machine. The present invention relates to a structure for mounting an exhaust emission control device, which is required when mounting on the vehicle or the like.

As an on-vehicle exhaust gas purification device, a device having a DPF casing equipped with a particulate filter (DPF) and an SCR casing equipped with a selective reduction catalyst (SCR) has been conventionally known, and this exhaust gas An exhaust gas purification device holding mechanism is also known in which the purification device is supported by a bracket on the vehicle body side (see Patent Document 1 below).

FIG. 9 shows an example of an exhaust gas treatment system including the above-described exhaust gas purification device for a vehicle.
As shown in FIG. 9, in the vehicle-mounted exhaust gas treatment system, first, the exhaust gas 101a is discharged from the diesel engine 100 through the exhaust manifold 100B.

In this case, in the middle of the exhaust pipe 101 through which the exhaust gas 101a passes, a particulate filter (DPF) 102 that collects particulates (diesel particulates) in the exhaust gas and a downstream side of the particulate filter 102 are provided. A selective reduction catalyst (SCR) 103 capable of selectively reacting nitrogen oxides (NOx) with ammonia even in the presence of oxygen is held by casings 107 and 108 and arranged in parallel.

Here, an oxidation catalyst 102A is installed on the input side of the particulate filter (DPF) 102. Further, an ammonia reduction catalyst 103B is installed on the output side of the selective reduction catalyst (SCR) 103.

Further, urea water is added as a reducing agent between the selective reduction catalyst (SCR) 103 and the particulate filter 102, whereby the particulates (diesel particles) and nitrogen oxides (NOx) are removed. A technical method of simultaneously reducing the values is known, and the known example of FIG. 9 also incorporates this.

In this case, an S-shaped connecting flow connecting the output end of the particulate filter 102 and the input end of the selective reduction catalyst 103 and having the urea water adding means 104 on the upstream side thereof. The passage 109 is provided, and the exhaust gas 101a discharged from the output end of the particulate filter 102 is returned to the input end of the adjacent selective reduction catalyst 103 through the connecting flow passage 109 in the opposite direction. Thus, the reaction time required for the urea water to be thermally decomposed into ammonia and carbon dioxide can be effectively secured by providing the communication channel 109 and lengthening the circulation time in the channel 109. It has become.

Further, the exhaust gas purification device is often an oxidation catalyst device (DOC) for removing particulate matter (particulate matter/PM) and nitrogen oxides (NOx), a reducing agent supply device (DRT), and a selection device. It includes a reduction catalyst device (SCR) or the like, or has a combination thereof as a constituent element (see Patent Documents 2 and 3 below).

JP, 2005-10531, A Japanese Patent No. 4286888 JP, 2010-196523, A

As described above, DPF casings, SCR casings, and the like are known as the main parts constituting the vehicle-mounted exhaust emission control device, and each of these device parts is supported by a bracket on the vehicle body side. An exhaust gas purification device holding mechanism is also known (see Patent Document 1).

In the conventional support structure (Japanese Patent Laid-Open No. 2015-10531) in which the exhaust gas purification device including the above-mentioned DPF casing, SCR casing, etc. is supported by the brackets on the vehicle body side, the accuracy of the bracket processing and assembly, and the exhaust gas Due to the bending of the bracket due to the weight of the purification device, an error (positional deviation) occurs in the position between the engine and the exhaust purification device. In such a case, it becomes difficult to connect the engine and the exhaust gas purification device, which hinders stable operation of the exhaust gas purification device and impairs reliability.

Also, in order to overcome the problem of narrowing the vehicle width while ensuring the strength of the traveling body frame, in the crane where the space between the end of the outrigger box and the side surface of the traveling body frame cannot be sufficiently secured, the outrigger stay In some cases, the exhaust gas purification device may be arranged above and used.
However, in such a case, there is an inconvenience that the vertical cylinders on the vehicle body side interfere with each other to hinder stable operation.

[Object of the Invention]
The present invention improves an inconvenience of the above-mentioned conventional example, and an exhaust emission control device that can be installed even in a work vehicle that has many mounted devices and a small installation area and that can continue exhaust treatment for a long time. Its purpose is to provide a structure.

In order to achieve the above object, an exhaust purification device mounting structure according to the present invention is an exhaust purification device mounting structure which is mounted on a vehicle body of a work vehicle and purifies exhaust gas from an engine,
An upright holding base material integrally holding an outer surface of a filter device unit (a DPF casing with a pre-stage catalyst) and a selective reduction type catalyst device unit (SCR casing) for sequentially processing the exhaust gas that constitutes the exhaust gas purification device. Is provided
The respective device parts of the exhaust emission control device are arranged and installed on the outer side surface of the upright holding base material so that the axes thereof are positioned in parallel along the longitudinal direction of the vehicle body and vertically. It is characterized by consisting of.

Here, in the above exhaust emission control device, the exhaust gas from the engine is first guided to the lower pre-catalyst filter device section (pre-catalyst DPF casing), where unburned fuel and one Nitrogen oxide is converted to nitrogen dioxide NO ₂ , and is then guided to the upper selective reduction catalyst unit (SCR casing) where the nitrogen oxide in the exhaust gas is injected by the injection of the reducing agent (for example, urea water). (NOx) becomes exhaust gas in a reduced state and is released into the atmosphere.

Further, in the case of this exhaust gas purification device, the exhaust gas purification device is mounted on the upright holding base material and vertically arranged in a narrow area, and installed so that the exhaust gas purification device operates normally regardless of the arrangement state. , The robustness of its structure is ensured.

Further, as described above, by disposing the filter device section below and the selective reduction catalyst device section (SCR casing) above, respectively, the operation of the exhaust gas purification device, that is, the exhaust gas treatment operation, can be performed. The exhaust gas that has been executed more smoothly as a whole and has been reduced is efficiently discharged as an ascending airflow when released into the atmosphere.

Here, the upright holding base material is arranged on the fender in the rear wheel region located outside the turning radius of the upper revolving structure pre-installed in the work vehicle and at a side surface position close to the engine. Good.
In this way, on the work vehicle side, the smooth operation of the upper revolving structure is ensured, and at the same time, when viewed from the exhaust emission control device side, the exhaust gas is continuously disposed because it is arranged at a side position close to the engine. Since the gas is taken in, the exhaust gas treatment can be smoothly and efficiently performed without specially installing a gas suction system.

In addition, in each of the above-mentioned DPF casing with the pre-catalyst and the SCR casing, the inlet side end portion and the outlet side end portion are the same so that the exhaust gas passing through the inside thereof flows in the same direction. The exhaust gas is discharged toward the inside of each of the casings from the front of the vehicle main body to the rear, first through the DPF casing with the pre-catalyst, and then through the SCR casing. The casings may be connected and arranged.

By doing this, even when checking the operating state of each device, it is possible to check from the upstream side to the downstream side according to the operation content, and in this respect, maintainability is improved and at the same time stable operation is achieved. There is an advantage that it can be planned.

Furthermore, an S-shaped pipe for connecting each of the casings is provided, and the straight line portion and the axis of each of the casings are set to face the same direction. It may be arranged at a position above the engine crankshaft on the vehicle body side and close to the engine crankshaft.

By doing this, the piping distance between the upstream filter device portion located below and the downstream selective reduction catalyst device portion located above can be substantially increased, and in this respect, In treating the exhaust gas, there is an advantage that the reducing agent (for example, urea water) can be installed with sufficient margin in terms of location and treatment time.

Further, the above-mentioned upright holding base material may be fixedly mounted on the side end portion of the vehicle body of the work vehicle by disposing the outer surface of the purifying device on the outer surface.
In this way, the exhaust gas purification device can be installed vertically by the upright holding base material, and therefore even a work vehicle with a small floor space for installation can be installed vertically so that space is saved. The advantage is that even small cars can be equipped.

Since the present invention is configured and functions as described above, according to this, the exhaust gas from the engine of the work vehicle is first treated by the filter device section (the DPF casing with the pre-stage catalyst) at the lower side to detect unburned fuel and exhaust gas in the exhaust gas. Nitric oxide etc. is converted into nitrogen dioxide NO ₂ , and thereafter, nitrogen oxide (NOx) in the exhaust gas is reduced in the upper selective reduction catalyst device part to become harmless exhaust gas, and this harmless exhaust gas Since it is designed to be released into the gas atmosphere, it has an exhaust gas treatment function equivalent to the exhaust gas treatment function of a normal exhaust purification device. It has a structure that can be arranged in a mold.

Therefore, for example, even in a small area such as a frame of a small vehicle, the exhaust gas purification device can be installed in a stable state via the upright holding base material, and the exhaust gas purification device can be installed upright. By installing it on the outer side surface of the holding base material, confirmation and maintenance from the outside can be facilitated, workability is greatly improved in this respect, and versatility can be further enhanced, which is an unprecedented excellent exhaust gas. A mounting structure for a purification device can be provided.

Here, the above-mentioned upright holding base material is arranged on the fender in the rear wheel region located outside the turning radius of the upper revolving structure pre-installed in the work vehicle and at a side surface position close to the engine. May be
In this way, on the work vehicle side, there is an advantage that a smooth operation of the upper swing body can be ensured and the size of the entire apparatus can be further reduced.

An embodiment of the present invention will be described below with reference to the accompanying drawings.
First, prior to the description of the mounting structure of the exhaust gas purification device according to the present invention, an outline (overall image) of a crane vehicle that is a work vehicle equipped with the exhaust gas purification device will be described.
As shown in FIGS. 3 to 4, a mobile crane 1 includes a vehicle main body 2, a swivel base 3 rotatably installed on the vehicle main body 2, and a base portion of the swivel base 3 that is pivotally attached to a vertical surface. It is provided with a multi-stage boom 4 that undulates and turns inside, and a working and operating cabin (hereinafter, simply referred to as “cabin”) 5 that is also fixed to the swivel base 3. Further, the crane vehicle 1 is provided with posture-stabilizing outriggers 6 at four corners of the vehicle body 2.
An engine EG is mounted in the center of the rear part of the vehicle body 2 as shown in FIG. 5, and an engine cover 7 that can be opened and closed is provided so as to cover the engine EG (see FIG. 4). ..
Then, behind the vehicle body 2, an exhaust gas purification device 10 having a sound deadening function is provided on one side surface portion (center of the left end portion of FIG. 4), and the cover 8 covers the exhaust gas purification device 10. Equipped.
Next, the exhaust gas purification device 10 equipped for cleaning the exhaust gas of the mobile crane 1 and its mounting structure will be specifically described.
In the present embodiment, the exhaust gas purification device 10 is an exhaust gas purification device that purifies the exhaust gas from the engine of the crane vehicle 1 as described above, and the main components thereof are the pre-catalyst DPF casing (filter device portion) 17 and Each axis of the SCR casing (selective reduction type catalyst device portion) 18 is connected to each other by an S-shaped pipe 19 so as to be oriented in the same direction as the longitudinal direction of the lower traveling body of the vehicle body 2, and on a vertical surface. It is divided into upper and lower parts and arranged in parallel.
The exhaust emission control device 10 is configured to be arranged on the rear fender of the rear wheel outside the upper revolving structure/revolving rear end radius and near the engine side in front of the rear outrigger stay.

Further, in the exhaust gas purification device 10, the inlet side end portion and the outlet side end portion of the DPF casing 17 with the front catalyst and the SCR casing 18 respectively face the same direction so that the exhaust gas flows in the same direction. So that
As a result, the exhaust gas in each of the casings 17 and 18 is exhausted from the front of the lower traveling body of the work vehicle 1 toward the rear through the DPF casing 17 with the front catalyst and the SCR casing 18.

Further, the straight line portion of the S-shaped pipe 19 connecting the respective casings 17 and 18 and the axial center of the respective casings 17 and 18 are oriented in the same direction, and the axial center of the DPF casing 17 with the pre-catalyst of the exhaust emission control device 10 is arranged. Is arranged closer to the upper part of the engine crankshaft.

Hereinafter, this will be described in more detail.
1(A) and 1(B), an exhaust emission control device 10 has a filter device portion that takes in exhaust gas from a diesel engine of a work vehicle 1 (see FIG. 5) equipped with the exhaust emission control device 10 and collects diesel particulates (particulates). Particulate filter (DPF) 12 and a selective reduction catalyst (SCR) disposed downstream of the particulate filter 12 and capable of selectively reacting nitrogen oxides (NOx) with ammonia even in the coexistence of oxygen. ) 13 and.

Here, the above-mentioned particulate filter (DPF/Diesel Particulate Filter) 12 for collecting diesel particulates and the selective reduction catalyst (SCR/Selective Catalytic Reduction) 13 constitute an apparatus body 10A.

The particulate filter (DPF) 12 and the selective reduction catalyst (SCR) 13 that compose the device body 10A of the exhaust emission control device 10 are individually held in the DPF casing 17 and the SCR casing 18, respectively. The casings 17 and 18 are held by the upright holding base material 20 in a state where both the casings 17 and 18 are maintained in a horizontal state and are arranged in parallel below and above, respectively.

At the same time, when the vehicle is mounted on the casings 17, 18, both of the exhaust gas input ports are directed toward the traveling direction (front) of the vehicle, and at the same time, the exhaust gas exhaust ports are both provided toward the rear of the vehicle. The casings 17 and 18 are configured so that the exhaust gas from the engine can always be taken in under the same conditions even when the exhaust gas changes in the operating state of the vehicle. It is assumed that the traveling vehicle is fixedly mounted so that exhaust gas can flow in and out in the same direction.

In the upright holding base material 20, the particulate filter (DPF) 12 and the selective reduction catalyst (SCR) 13 described above are provided on one plate surface of the upright holding base material 20, respectively, in the DPF casing 17 and the SCR. It is fixedly installed inside the casing 18 while maintaining a horizontal state.

Specifically, in order to process the exhaust gas from the engine, in the present embodiment, the particulate filter (DPF) 12 that takes in the exhaust gas from the engine from the exhaust inlet 17a of the casing 17 is located below the upright holding base material 20 described above. The selective reduction catalyst (SCR) 13 in the region (in the present embodiment, on the upstream side of the exhaust system) and on the side of the casing 18 that processes the exhaust gas that has passed through the particulate filter 12 as described above is provided on the upright holding group. They are arranged and fixedly installed in the upper region of the material 20 (downstream side of the exhaust system in this embodiment).

As a result, the exhaust gas from the engine is immediately taken into the particulate filter (DPF) 12 from the exhaust inlet 17a arranged on the upstream side (the casing 17 located below) close to the engine side, and the particulate filter The curate filter (DPF) 12 and the selective reduction catalyst (SCR) 13 are sequentially circulated, and exhaust treatment is performed in the circulation process, and thereafter, the exhaust gas is discharged from an exhaust outlet 18b of a casing 18 installed above. It is like this.

Here, with respect to the upright holding base material 20, a mounting fixing portion 20B (see FIGS. 7 and 8) is provided at the lower end portion thereof so that the plate surface thereof maintains the upright state when the work vehicle is equipped with the upright holding base material 20. It is provided.
Further, this upright holding base material 20 is made of a flat plate-shaped member in the present embodiment, and in the upright state, both left and right ends in the width direction are bent inward, whereby the upright holding base material 20 as a whole. In addition, its strength is enhanced (see FIGS. 1 and 7).

Further, as shown in FIG. 1B, an oxidation catalyst 12A is installed on the input side of the particulate filter (DPF) 12 located on the upstream side. Similarly, an ammonia reduction catalyst 13B is installed on the output side of the downstream selective reduction catalyst (SCR) 13.

In this case, in the particulate filter (DPF) 12, the unburned fuel (HC etc.) and carbon monoxide (CO) contained in the exhaust gas of the engine are treated and the nitric oxide (NO) in the exhaust gas is converted into nitrogen dioxide. It is intended to be oxidized to (NO ₂ ).
The particulate filter (DPF) 12 has a function of oxidizing CO into carbon dioxide (CO ₂ ) and burning unburned fuel (HC) as the exhaust temperature rises.

Furthermore, the above-mentioned selective reduction catalyst (SCR) 13 reacts with a reducing agent (for example, urea water) in the exhaust gas to reduce nitrogen oxides (NOx), and finally exhaust gas is converted into nitrogen and water. It has the function of converting to a mixture and releasing it to the outside.

Then, as described above, the upstream particulate filter (DPF) 12 disposed below and the downstream selective reduction catalyst (SCR) 13 disposed above are, in the present embodiment, They are connected by an S-shaped pipe 19 which is a communication channel.

The S-shaped pipe 19 is equipped with a reducing agent adding means 14 for adding urea water as a reducing agent, and by appropriately operating this during the operation of the entire system, the exhaust gas after passing through the particulate filter 12 is exhausted. As for the above, the particulates (diesel particles) and the nitrogen oxides (NOx) described above can be simultaneously reduced.

Here, the upstream particulate filter 12 and the downstream selective reduction catalyst (SCR) 13 arranged above the upstream particulate filter 12 are held in the casings 17 and 18 that store them individually. The exhaust input ports are arranged in parallel in the same direction.

Specifically, the particulate filter 12 and the selective reduction catalyst (SCR) 13 are arranged in parallel so that the exhaust inlet and outlet thereof are always directed in the same direction by the S-shaped pipe 19 described above. Therefore, the exhaust gas flowing inside always flows in the same direction, so that the particulate filter 12 and the selective reduction catalyst 13 are the same even if the operation of the traveling vehicle changes. Therefore, the external operation (vibration during traveling, etc.) is, of course, always the same as that of the particulate filter 12 and the selective reduction catalyst. (SCR) 13 is applied.

Then, the exhaust gas discharged from the output end portion 17b of the particulate filter 12 through the S-shaped pipe 19 which is the communication flow path is turned up in the reverse direction and upward, and is adjacent to the upper position. It is introduced into the input end portion 18a of the selective reduction catalyst 13.
As a result, the reaction time required for the urea water to be thermally decomposed into ammonia and carbon dioxide gas is effectively secured by providing the S-shaped pipe 19.

In other words , in the exhaust gas purification device equipped in the present embodiment, as described above, the filter device unit (pre-stage catalyst-equipped DPF casing) 17 for sequentially processing the exhaust gas and the selective reduction catalyst device unit (SCR casing). ) 18 and the upright holding base material 20 which hold|maintains integrally on the outer surface.
That is, the respective device parts (casing) 17 and 18 of this exhaust gas purification device are arranged on the above-mentioned outer side surface of the upright holding base material 20 so that the axes thereof are vertically and horizontally arranged in parallel. As a result, in the process of moving the exhaust gas from the lower side to the upper side, the exhaust gas smoothly flows in each casing from one side to the other side, and exhaust treatment is sequentially performed during this period. It is like this.

Therefore, the exhaust gas discharged from the engine located below the filter device part (the DPF casing with the pre-stage catalyst) 17 located below, the above-mentioned S-shaped pipe 19, and the selective reduction type located above it. It passes through the catalyst device portion (SCR casing) 18 in sequence, and during this period, it is sequentially exhausted as described above, and is discharged from the upper side to the outside.

Here, in the present embodiment, the upright holding equipment 20 described above is mounted on the engine of the work vehicle on the fender in the rear wheel region located outside the turning radius of the upper revolving structure which is previously equipped in the work vehicle. It is arranged at a position close to one side surface on the work vehicle.
Specifically, as shown in FIGS. 7 and 8, the respective device parts (casing) 17 and 18 of the exhaust gas purification device are arranged outside in the left side region (side face of the engine) of the rear part of the frame 2C of the vehicle body 2. Then, the upright holding base material 20 described above is provided.

For this reason, the exhaust port of the engine and the exhaust purification device 10 can be connected by a short exhaust pipe, which reduces the overall flow resistance in the exhaust pipe, so that the exhaust gas from the engine is reduced in exhaust loss. Under this condition, the exhaust process to the outside will be smoothly performed.

Further, in the present embodiment, as described above, the casings of the DPF casing 17 with the pre-catalyst and the SCR casing 18 are connected to the respective inlet side end portions so that the exhaust gas passing through the inside thereof flows in the same direction. The outlet side end is arranged in the same direction through the above-mentioned S-shaped pipe 19.

Therefore, the exhaust gas passes through the respective casings from the front of the vehicle main body toward the rear, first through the DPF casing 17 with the pre-stage catalyst, and then passes through the SCR casing 18 on the downstream side to be discharged. The casings 17 and 18 are connected to each other, so that the wind pressure or the like caused by the traveling of the vehicle body does not become the exhaust resistance of the exhaust gas.

Further, the connecting flow path that connects the casings 17 and 18 described above is formed by the S-shaped pipe (S-shaped pipe) 19 as described above, and the entire S-shaped pipe 19 is the shaft of each casing. It is arranged along the core, and the axis of the DPF casing 17 with the upstream catalyst is arranged at a position above the engine crankshaft on the vehicle body side and close to the engine crankshaft.

Therefore, the S-shaped pipe 19 allows the casings 17 and 18 to be provided side by side, and the entire pipe can be set to be short, so that the exhaust flow passage can be secured in a state where the exhaust resistance is small, and the casings can be secured. Since it is possible to equip 17 and 18 in parallel, it is possible to downsize the entire apparatus.

Further, since the upright holding base material 20 described above is arranged so that the mounting surface of the exhaust gas purification device 10 is arranged outside and fixed to the side end portion of the vehicle body of the work vehicle, as described above, the space can be saved. Even for a small work vehicle or a small work vehicle, the exhaust emission control device according to the present embodiment can be effectively equipped. Specific examples of this case are shown in FIGS.

FIG. 7 shows an example in which the exhaust gas purifying apparatus 10 according to the above-described embodiment is provided on the side end of a relatively large work vehicle through the upright holding base material 20.
In FIG. 7, reference symbol Fr indicates the direction in front of the work vehicle. Further, reference numeral 1C indicates a rear body portion of the work vehicle 1. Further, the upright holding base material 20 is fixedly equipped with an L-shaped fixing auxiliary member 20A at the center portion on the back side thereof. Then, the upright holding base material 20 holding the entire exhaust emission control device is attached to the rear frame 2C of the vehicle body 2 via the fixing auxiliary member 20A.

(Appendix)
The contents of FIGS. 1 to 8 showing the above-described embodiment can be summarized as follows.
(Appendix 1)
A mounting structure of an exhaust gas purification device 10 which is mounted on a vehicle body of a work vehicle 1 and purifies exhaust gas from an engine, which constitutes a part of the exhaust gas purification device 10 and which sequentially processes the exhaust gas. An upright holding base material 20 for integrally holding the device portion 12 and the selective reduction catalyst device portion 13 on the outer surface is provided,
The respective device parts 12 and 13 of the exhaust emission control device 10 are arranged in parallel on the outer side surface of the upright holding base material 20 with their axes along the longitudinal direction of the vehicle main body and divided vertically. An exhaust purification device mounting structure characterized by being installed.

(Appendix 2)
In the mounting structure of the exhaust emission control device according to attachment 1,
The above-described pre-catalyst filter device unit 12 is held by the pre-catalyst DPF casing 17, and the selective reduction type catalyst device unit 13 is held by the SCR casing 18. An exhaust purification device mounting structure, wherein the filter device part 12 and the selective reduction catalyst device part 13 are integrally connected and mounted to the upright holding base material 20.

(Appendix 3)
In the exhaust purifying device mounting structure according to appendix 1 or 2,
The upright holding base material 20 is arranged on the fender in the rear wheel region located outside the turning radius of the upper revolving structure pre-installed in the work vehicle 1 and at a side surface position close to the engine. A structure for mounting an exhaust emission control device.

(Appendix 4)
In the mounting structure of the exhaust emission control device according to appendix 1, 2, or 3,
The respective casings of the DPF casing 17 with the pre-catalyst and the SCR casing 18 are arranged such that the respective inlet side end portions and outlet side end portions are directed in the same direction so that the exhaust gas passing through the inside thereof flows in the same direction. Along with
Each of the casings is so arranged that the exhaust gas passes through each of the casings 17 and 18 from the front of the vehicle body toward the rear, first through the DPF casing 17 with the pre-stage catalyst, and then through the SCR casing 18. An exhaust purification device mounting structure characterized in that 17, 18 are connected and arranged.

(Appendix 5)
In the mounting structure of the exhaust emission control device according to any one of appendices 1 to 4,
The S-shaped pipe 19 for connecting the casings 17 and 18 is provided, and the straight portion thereof and the axis of the casings 17 and 18 are set to face the same direction. An exhaust gas purifying device mounting structure, wherein an axis 17 is disposed at a position above the engine crankshaft on the vehicle body side and close to the engine crankshaft.

(Appendix 6)
In the attachment structure of the exhaust emission control device according to any one of appendices 1 to 5,
An exhaust gas purifying device mounting structure, wherein the upright holding base material 20 is fixedly attached to a side end portion of a vehicle body of the work vehicle 1 with an outer surface of the purifying device disposed on an outer surface.

(Effects of the embodiment)
When the exhaust gas purifying apparatus 10 configured as described above is mounted on the work vehicle 1 as shown in FIGS. 5 to 6, when the engine of the work vehicle 1 is operated, the exhaust gas emitted from the engine located near the side Is guided to the exhaust gas purification device 10 mounted on the upright holding base material 20 through an exhaust pipe, and in the exhaust gas purification device 10, the filter device portion (the DPF casing with the pre-stage catalyst) 17 located below the exhaust gas purification device 10, and The S-shaped pipe 19 and the selective reduction catalyst unit (SCR casing) 18 located above the S-shaped pipe 19 are sequentially passed through, and during this period, exhaust treatment is sequentially performed as described above, and purified exhaust is directed toward the outside. Are sequentially released as.

Further, since the exhaust emission control device 10 is arranged to be installed at one side end of the traveling vehicle via the upright holding base material 20, it can be robustly installed in a small space without taking an installation place. Therefore, it can be easily installed in a small work vehicle 1 and the like, and has an unprecedented excellent effect of being versatile and durable.

In the embodiment, the exhaust gas purification device according to the present invention has been described in detail by exemplifying the case of being mounted on a work vehicle, but the present invention functions as a vehicle-mounted device for all vehicles regardless of the vehicle type. It has the versatility to purify exhaust gas.

FIG. 1A is an external perspective view showing an embodiment of the present invention, FIG. 1A is an external perspective view seen from the exhaust inlet side, and FIG. 1B is a simplified schematic view of FIG. 1A. It is an external appearance perspective view which shows one Embodiment of this invention, and is an external appearance perspective view seen from the exhaust outlet side. It is explanatory drawing which shows the whole external appearance of the mobile crane equipped with the exhaust gas purification apparatus concerning embodiment disclosed in FIG. It is a rear view which shows the rear end surface (right end surface of FIG. 3) of the crane vehicle disclosed in FIG. FIG. 5(A) is an explanatory view showing a mounting state seen from the rear side of the work vehicle, and FIG. 5(B) is an example when the embodiment disclosed in FIG. 1 is mounted on the left end portion of the work vehicle. It is a left side view of (A). FIG. 6 is a plan view of the explanatory diagram disclosed in FIG. FIG. 3 is a perspective view showing an example in which an exhaust emission control device according to the present invention is installed at an end of a frame 2C of a vehicle body 2. FIG. 6 is a perspective view showing an example of a case where the exhaust emission control device according to the present invention is further installed at the end of the frame 2C of the vehicle body 2. It is explanatory drawing which shows a prior art example.

1 work vehicle (crane vehicle)
10 Exhaust Purification Device 10A Device Main Body 12 Particulate Filter (DPF)
13 Selective reduction catalyst (SCR)
17 DPF casing with pre-catalyst (filter unit)
18 SCR casing (selective reduction catalyst unit)
19 S-shaped pipe 20 Upright holding base material

Claims (2)

A mounting structure for an exhaust gas purification device, which is mounted on a vehicle body of a work vehicle and purifies exhaust gas from an engine,
A pre-stage catalyst-equipped filter device unit for sequentially processing the exhaust gas that constitutes a part of the exhaust gas purification device and a selective reduction type catalyst device unit, and an upright holding base material that integrally holds the outer surface is provided,
The respective device parts of the exhaust emission control device are arranged and installed on the outer side surface of the upright holding base material such that their axial centers are arranged in parallel along the longitudinal direction of the vehicle main body and vertically separated. In the exhaust purification device mounting structure,
The pre-catalyst filter device unit is held by a pre-catalyst DPF casing, and the selective reduction catalyst device unit is held by an SCR casing. The pre-catalyst filter device unit and the selective reduction type catalyst unit are held by the respective casings. The catalyst device portion is integrally connected to and held by the upright holding base material,
The upright holding base material is provided close to a side surface position of the engine on a fender in a rear wheel area located outside a turning radius of an upper swing body pre-installed in the work vehicle and in front of a rear outrigger stay. Exhaust purification device mounting structure characterized by being installed as The mounting structure for an exhaust emission control device according to claim 1 ,
Each casing of the SCR casing and the precatalyst with DPF casing, an outlet end and the inlet side end portion so that the exhaust to pass through the inside flows toward the same direction, each oriented in the same direction With placement
The exhaust, the inside each casing, from the front side to the rear side of the vehicle body, as initially discharged exits the SCR casing after passing through the pre-catalyst with DPF casing, each of said casing S-pipe And the linear portion and the shaft core of each of the casings are set to face the same direction, and the shaft core of the pre-catalyst DPF casing is connected to the engine crankshaft of the vehicle body side. A structure for mounting an exhaust emission control device, characterized in that it is arranged at a position above the engine crankshaft and close to the engine crankshaft.