JP2019019782A - Work vehicle with exhaust gas purifier - Google Patents

Abstract

To achieve simplification of an attachment structure when first and second purifiers are mounted.SOLUTION: A fork lift includes: a vehicle body frame 500 forming an engine housing space below a driver seat; an engine 1 which is installed in the engine housing space with a longitudinal axis oriented in a vehicle forward and rearward movement direction; a first purifier 200 which purifies exhaust gas of the engine; and a second purifier 300 which further purifies the exhaust gas purified by the first purifier 200. The first purifier 200 is provided at a first installation part 503 provided at the vehicle body frame 500 at the lateral side of the engine 1. The second purifier 300 is provided at a second installation part 504d provided at the vehicle body frame 500 at the lateral side of the engine 1.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a purification device for exhaust gas discharged from an engine, and more particularly to a work vehicle such as a forklift provided with at least two types of purification devices.

  Conventionally, an exhaust gas purification device having a diesel particulate filter and a selective catalytic reduction (SCR) system connected downstream of the diesel particulate filter is disclosed in, for example, a patent. Known from document 1.

  In the work vehicle described in Patent Document 1, an engine housing space is provided below the driver's seat, that is, below the hood, and the engine is mounted in this space. A radiator fan and a radiator are provided behind the driver's seat. The diesel particulate filter (first purification device) is disposed on the radiator fan, and the urea selective catalytic reduction system (second purification device) is disposed on the radiator. Both the first purification device and the second purification device have cylinders containing a catalyst and a filter, and these cylinders are arranged to extend in parallel to the vehicle left-right direction.

JP 2014-177851 A

  In a work vehicle equipped with an exhaust gas purifying device having first and second purifying devices described in Patent Document 1, as shown in FIGS. The first purifier 2a is installed by a first support frame 100 fixed to the fuselage frame 94 above the radiator fan behind the engine and supported by the vibration isolator 34, and above the radiator fan at the rear of the radiator. The second purification device 2b is installed by the second support frame 105 fixed to the frame 94. The first and second support frames 100 and 105 that support the first and second purification devices, which are several tens of kilograms, are large structures, and the total weight of the exhaust gas purification device, and thus the total vehicle weight, increases. .

(1) A work vehicle with an exhaust gas purifying device according to a first aspect of the present invention is installed in a vehicle body frame that forms an engine housing space below a driver's seat, and in the engine housing space with a longitudinal axis directed in the vehicle forward and backward direction. An engine, a first purification device that purifies the exhaust gas of the engine, and a second purification device that further purifies the exhaust gas purified by the first purification device, the first purification device comprising: The second purifying device is provided in a second installation part provided in the vehicle body frame on the side of the engine, and is provided in a first installation part provided in the vehicle body frame on the side of the engine.
(2) In the work vehicle with an exhaust gas purifying device according to the second aspect of the present invention, the first installation portion is provided at a position below the cylinder head of the engine and at a side position of the cylinder block, The first purification device is installed in the first installation part with its axis extending in the vehicle left-right direction.
(3) In the work vehicle with an exhaust gas purification device according to the third aspect of the present invention, the body frame includes a rear fender, the second installation portion is provided on an upper surface of the rear fender, and the second purification device includes: The axial line extends in the vehicle forward and backward direction and is installed in the second installation part.
(4) A work vehicle with an exhaust gas purification device according to a fourth aspect of the present invention is the work vehicle with an exhaust gas purification device according to the third aspect, wherein the vehicle outer side end of the first purification device is the body frame. The engine and the first purification device are connected by a first connecting pipe, and an exhaust gas outlet port at the projection end of the first purification device; The exhaust gas inlet port of the second purification device is connected by a second connection pipe having an axis line in the vehicle front-rear direction, and the second connection pipe passes through the vehicle front side wall of the rear fender, and further the rear fender. And is connected to the exhaust gas inlet port of the second purification device.
(5) The work vehicle with an exhaust gas purifying device according to the fifth aspect of the present invention is the work vehicle with an exhaust gas purifying device according to the fourth aspect, wherein the vehicle body frame projects from the vehicle side. The projecting end of the first purification device and the second connecting pipe are disposed in a space between the step and the vehicle front side wall of the rear fender, and the space can be opened and closed to the vehicle body frame. Covered with a provided cover.
(6) A work vehicle with an exhaust gas purification device according to a sixth aspect of the present invention is the work vehicle with an exhaust gas purification device according to any one of the first to fifth aspects, wherein the engine and the first purification device are included. The first connection pipe to be connected, and the second connection pipe connecting the first purification device and the second purification device are covered with a heat insulating cover.
(7) A work vehicle with an exhaust gas purification device according to a seventh aspect of the present invention is the work vehicle with an exhaust gas purification device according to the first aspect, wherein the first purification device has its axis extending in the vehicle left-right direction. The second purification device is installed with its axis extending in the vehicle forward-reverse direction.
(8) A work vehicle equipped with an exhaust gas purifying device according to an eighth aspect of the present invention is installed in the engine housing space with a vehicle body frame forming an engine housing space below the driver's seat and a longitudinal axis directed in the vehicle forward and backward direction. An engine, a first purification device that purifies the exhaust gas of the engine, and a second purification device that further purifies the exhaust gas purified by the first purification device. And a first installation part provided in the main structure, and a second installation part provided in the main structure, the first installation part being at a position below the cylinder head of the engine, and , Provided at a side position of the cylinder block, the first purification device is installed in the first installation part, the second installation part is a rear position of the cylinder head of the engine, and the cylinder head Provided in a square position, said second purifying device is installed in the second installation unit.
(9) A work vehicle with an exhaust gas purifying device according to a ninth aspect of the present invention is installed in the engine housing space with a vehicle body frame forming an engine housing space below the driver's seat and a longitudinal axis directed in the vehicle forward and backward direction. An engine, a first purification device that purifies the exhaust gas of the engine, and a second purification device that further purifies the exhaust gas purified by the first purification device, the first purification device comprising: The axis line is installed extending in the left-right direction of the vehicle, and the second purification apparatus is installed with its axis line extending in the vehicle forward-rearward direction.

According to the present invention, the support structure of the first and second purification devices is simplified, and an increase in the total weight of the exhaust gas purification device, and thus the work vehicle, can be suppressed.
According to another invention, the position of the center of gravity of the vehicle can be lowered, the stability is improved, and at the same time, the degree of freedom of arrangement of the first and second purification devices is improved.
Furthermore, according to another invention, the arrangement | positioning freedom degree of a 1st and 2nd purification apparatus improves.

Left side view of a forklift with an exhaust gas purification device of the first embodiment Top view of forklift with exhaust gas purifying device according to the first embodiment The rear view of the forklift with an exhaust gas purification device of a 1st embodiment The figure explaining schematic structure of the exhaust-gas purification apparatus of 1st Embodiment External perspective view of the left rear side of the forklift In the external perspective view of FIG. 5, in particular, a perspective view for explaining the arrangement of main components of the exhaust gas purification device 7A is a perspective view seen from the front diagonally forward, and FIG. 7B is a front view seen from the front. 8A is a left side view of FIG. 7B, and FIG. 8B is a top view of FIG. 8A. Perspective view of body frame 500 Front view of the body frame 500 as seen from the front of the vehicle Left side view of FIG. Top view of body frame The perspective view which looked at the rear fender of the forklift of a 1st embodiment from the vehicles back lower part The top view explaining the forklift with an exhaust-gas purification apparatus of 2nd Embodiment 14 is a side view of the vehicle as viewed from the right side of the vehicle.

Hereinafter, an exhaust gas purifying apparatus according to the present invention will be described as an embodiment in which it is mounted on a forklift.
-First embodiment-
Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
(forklift)
1 to 3 show a forklift 100 that is an example of a work vehicle according to the present invention. 1 is a side view of a forklift, FIG. 2 is a top view, and FIG. 3 is a rear view.
The forklift 100 in the first embodiment is an engine-type forklift. The forklift 100 includes a cargo handling mast 130 at the front of a vehicle body (hereinafter referred to as a frame) 500. The cargo handling mast 130 is provided with a fork 140 that can be raised and lowered. The cargo handling mast 130 is tilted in the left-right direction in the figure by a tilt cylinder 150 provided in the vehicle body frame 500. The fork 140 is guided by the cargo handling mast 130 and moved up and down by the lift cylinder 155. The vehicle body frame 500 is provided with a driver's cab 160 including a driver's seat 165, front wheels 170F and rear wheels 170R for moving the vehicle body frame 500, an engine, a hydraulic circuit, and the like. Accommodation space) and a counterweight 800 at the rear of the vehicle. The storage unit stores an exhaust gas purification device, which will be described later, and exhaust gas purified by the exhaust gas purification device is exhausted from the exhaust pipe 400 behind the cab 160.

(Overall configuration of exhaust gas purification device)
FIG. 4 is a configuration diagram showing an outline of an exhaust gas purification device mounted on a forklift according to the present invention. An oxidation catalyst for diesel (Diesel Oxidation Catalyst: DOC) 3 is provided in the middle of an exhaust path 2 through which exhaust gas discharged from a diesel engine main body (hereinafter, engine) 1 that is an internal combustion engine flows. The oxidation catalyst 3 is also called a DOC exhaust gas purification device, and is for oxidizing a part of NO contained in the exhaust gas into NO ₂ . A diesel particulate filter (DPF) 4 for removing particulate matter (PM) contained in the exhaust gas is provided downstream of the oxidation catalyst 3. Downstream of the DPF 4, there is provided an SCR catalyst 5 for purifying NOx into nitrogen and water by a chemical reaction between ammonia and NOx produced by hydrolysis of urea water injected into the exhaust gas. An ammonia slip catalyst (ASC catalyst) 6 is provided downstream of the SCR catalyst 5 to oxidize the ammonia remaining without being consumed by the chemical reaction in the SCR catalyst 5.

  Although description is omitted in FIG. 1, each device is actually connected by a pipeline. Particularly, the DPF 4 and the SCR catalyst 5 are connected by a urea water injection pipe 8 to which a urea water injection valve 7 is attached. The urea water is injected from a urea water injection valve 7 provided on the upstream side of the SCR catalyst 5.

The DPF 4 includes a cylindrical container and a PM processing unit that is provided in the container and burns the captured fine particles when the temperature of the exhaust gas is high. If the operation state where the exhaust gas temperature is low is continued, the filter unit of the PM processing unit is clogged. For the purpose of detecting this clogging, a differential pressure sensor for detecting the inlet pressure and the outlet pressure of the cylindrical container is mounted. When the differential pressure increases, unburned fuel from the oxidation catalyst 3 is used to raise the exhaust gas temperature and burn PM.
The oxidation catalyst 3 and the DPF 4 constitute a DPF purification device (first purification device) 200 with a DOC.

The SCR catalyst 5 is accommodated in a cylindrical container (shown as a cylindrical container 302 in FIG. 6) connected to the rear stage of the urea water injection pipe 8 (shown as a cylindrical container 301 in FIG. 6). The ASC catalyst 6 is also accommodated in this cylindrical container. A urea selective catalyst reduction system (SCR) 300 is configured by the urea water injection pipe 8, the urea water injection valve 7, the SCR catalyst 5, and the ASC catalyst 6. This system 300 is referred to as an SCR purification device (second purification device) 300. The urea water injection pipe 8 and the urea water injection valve 7 constitute a urea water injection unit.
The DPF purification device (first purification device) 200 with DOC and the SCR purification device (second purification device) 300 described above constitute an exhaust gas purification device 700.

The operation of the exhaust gas purification apparatus 700 configured as described above will be described.
Exhaust gas discharged from the engine 1, first flows into the oxidation catalyst 3 in the course of flowing through the exhaust passage 2, a part of NO contained in the exhaust gas becomes oxidized NO _2. The exhaust gas that has passed through the oxidation catalyst 3 flows into the DPF 4 and PM in the exhaust gas is collected, and the collected PM is burned and removed by reaction with NO ₂ contained in the exhaust gas. The exhaust gas that has passed through the DPF purification device 200 flows into the SCR purification device 300.

  When the exhaust gas flows into the SCR purification device 300, the urea water added from the urea water injection valve 7 in the urea water injection pipe 8 upstream of the SCR catalyst 5 is hydrolyzed by the heat of the exhaust gas, and ammonia and carbon dioxide. Become. The produced ammonia and NOx in the exhaust gas are reduced by the SCR catalyst 5 into nitrogen and water. Ammonia remaining without being consumed in the SCR catalyst 5 is oxidized in the oxidation catalyst 6, and the exhaust gas from which NOx has been purified is discharged into the atmosphere.

A forklift equipped with an exhaust gas purification device will be described in detail with reference to FIGS.
FIG. 5 is an external perspective view of the left rear side of the forklift, and FIG. 6 is a perspective view for explaining the arrangement of the main components of the exhaust gas purifying device 700 in the external perspective view of FIG.
As shown in FIGS. 5 and 6, the forklift 100 has a vehicle body frame 500 serving as a skeleton of the vehicle body. The vehicle body frame 500 includes an engine 1, a DPF purification device (first purification device) 200 with a DOC, and an SCR purification. A device (second purification device) 300 or the like is mounted on storage units 191K and 192K covered with a bonnet 191 and a cover 192. The storage unit 191K can also be called an engine storage space.

The engine 1 and the exhaust gas purification device 700 will be further described with reference to FIGS. 7 (a) is a perspective view seen from the front oblique front, FIG. 7 (b) is a front view seen from the front, FIG. 8 (a) is a left side view of FIG. 7 (b), and FIG. FIG. 9 is a top view of FIG.
Referring to FIG. 6, a storage portion 191 </ b> K is formed by a body frame 500 below a hood 191 where a driver's seat is installed. 7 and 8, the engine 1 is installed on the bottom plate 501 of the vehicle body frame 500 in the storage portion 191K.

  Referring to FIG. 6, a DPF purification device 200 and an SCR purification device 300 are disposed on a vehicle body frame 500 on the right side of the vehicle. As shown in FIG. 8 (b), the DPF purification device 200 has an axis 200 </ b> AX that extends orthogonally to the axis 1 </ b> AX of the engine 1 and extends to the right side of the vehicle. The SCR purification apparatus 300 has axes 300AX1 and 300AX2 that extend rearward of the vehicle in parallel with the axis of the engine 1. The axis 300AX1 is the axis of the urea water injection pipe 301 (urea water injection pipe 8 in FIG. 4), and the axis 300AX2 is the axis of the cylindrical pipe 302 in which the SCR catalyst 5 and the oxidation catalyst 6 are accommodated.

The arrangement and connection relationship of the engine 1, the DPF purification device 200, and the SCR purification device 300 will be described with reference to FIGS.
The DPF purification device 200 has an exhaust gas inlet port 201 and an exhaust gas outlet port 202. The exhaust gas inlet port 201 is connected to the exhaust port of the engine 1 through a connection pipe 601. The outer peripheral surface of the connecting pipe 601 is covered with a replaceable heat insulating cover (not shown). As shown in FIG. 6, the protruding end 203 that is the right side end portion of the DPF purification device 200 protrudes from the opening 504 b of the side panel 504 a of the right side cover 504 of the vehicle body frame 500 to the right side of the vehicle. The projecting end 203 is provided with an exhaust gas outlet port 202 at the rear of the vehicle, and a connection pipe 602 is connected to the exhaust gas outlet port 202. The outer peripheral surface of the connecting pipe 602 is covered with a replaceable heat insulating cover 602a (see FIG. 6). The connecting pipe 602 extends to the rear of the vehicle, and the other end is connected to the SCR purification device 300.

The SCR purification apparatus 300 is connected to the urea water injection pipe 301 for hydrolyzing the urea water injected from the urea water injection valve 8 into ammonia and carbon dioxide with the heat of the exhaust gas, and the urea water injection pipe 301, and urea water injection It includes a cylindrical container 302 in which the SCR catalyst 5 and the oxidation catalyst 6 for reducing ammonia generated in the pipe 301 and NOx in the exhaust gas are accommodated. The urea water injection pipe 301 and the cylindrical container 302 are integrated in advance as an assembly.
The outlet port of the connection pipe 602 described above is connected to the exhaust gas inlet port 301 a of the urea water injection pipe 301. The exhaust gas outlet port of the urea water injection pipe 301 is connected to the exhaust gas inlet port 302a of the SCR cylindrical container 302 in which the SCR catalyst 5 is accommodated. An exhaust pipe 400 is connected to the exhaust gas outlet port 302 b of the SCR cylindrical container 302.

(Body frame 500)
9 to 12 are views showing a vehicle body frame 500 on which the engine and the exhaust gas purifying device are mounted. FIG. 9 is a perspective view of the vehicle body frame corresponding to FIGS. 5 and 6. FIG. 10 is a vehicle body frame viewed from the front of the vehicle. 11 is a left side view of FIG. 10, FIG. 12 is a top view of the vehicle body frame, and FIG. 13 is a perspective view of the rear fender as viewed from the rear lower part of the vehicle.

The structure of the vehicle body frame 500 will be described with reference to FIGS.
The vehicle body frame 500 projects from the bottom plate 501 on which the engine is installed at the center, a pair of side walls 502L and 502R rising from the left and right edges of the bottom plate 501 and the vehicle right side of the side wall 502R. Are installed on the right side of the vehicle on the side wall 502R, the right side cover 504 forming the vehicle body appearance on the right side of the vehicle, and the front fender 505 formed on the front and rear sides of the right side cover 504. A rear fender 506, and a rear fender 506 and an installation plate 504d provided on the upper surface of the right side cover 504. The installation plate 503 is provided at a position below the cylinder head of the engine 1 and at a side position of the cylinder block.

The right side cover 504 includes a panel 504a on the right side of the vehicle body, an opening 504b opened in the panel 504a, and a right step 504c. The protruding end 203 of the DPF purification device 200 protrudes from the opening 504b.
The rear fender 506 is provided with an opening 506a, and the installation plate 504d provided on the rear side of the right side cover 504 is provided with an opening 504e. A connecting pipe 602 that sends exhaust gas from the DPF purification device 200 to the SCR purification device 300 extends to the SCR purification device 300 through the opening 506a on the vehicle front side wall of the rear fender 506, the installation plate 504d, and the opening 504e of the rear fender 506. Has been. As shown in FIG. 13, a heat insulating cover 520 (FIG. 13) that covers the space through which the connecting pipe 602 that has passed through the opening 506 a of the rear fender 506 passes is provided on the rear surface of the rear fender 506.

(Insulation measures)
As described above, in the forklift according to the embodiment, the layout of the exhaust gas purification device is devised. For this reason, some devices and pipe lines are easily exposed to the external space. Therefore, the following heat insulation measures are taken in the forklift according to the embodiment.
6, the protruding end 203 of the DPF purification device 200 passes through the opening 504b of the side panel 504a of the right side cover 504 and is surrounded by the step 504c and the front and rear fenders 505 and 506. It is the structure exposed to the external space. A part of the connecting pipe 602 is also exposed in this space. The connection pipe 602 is further configured to be exposed to the outside on the rear side of the rear fender 506. That is, the connecting pipe 602 is bent through the vehicle front side wall of the rear fender 506 and further through the opening 504e of the rear fender 506 and the installation plate 504d, and is connected to the exhaust gas inlet port 301 of the SCR purifying apparatus 300. Yes.

As shown in FIG. 5, a box-shaped cover 510 having a heat insulating structure is provided on the vehicle rear side of the external space surrounded by the step 504 c and the front and rear fenders 505 and 506, and together with the rear fender 506, the DPF purification device 200 The protruding end 203 and the connecting pipe 602 are isolated from the external space. As shown in FIG. 13, the pipe passage space on the back surface of the rear fender 506 is isolated from the external space by a heat insulating cover 520. The heat insulating cover 510 includes an opening / closing door, and the maintenance work can be performed on the DPF purification device 200 and the connecting pipe 602 by opening the opening / closing door.
As shown in FIG. 6, a replaceable heat insulating cover 602 a is wound around the outer peripheral surface of the connecting pipe 602. Although not shown, an exchangeable heat insulating cover is also wound around the outer peripheral surface of the connecting pipe 601.

In the forklift according to the embodiment, the DPF purification device 200, the SCR purification device 300, and the connecting pipes 601 and 602 connected to the DPF purification device 200 and the connection pipes 601 and 602 connected thereto are provided with the exhaust gas purification device in the engine compartment of the vehicle body frame in which the engine is disposed as in the related art. Compared with the case where it arrange | positions, it arrange | positions to the ambient environment whose ambient temperature is lower than atmospheric temperature or engine room temperature. That is, as an efficient arrangement space, the DPF purification device 200 is arranged on the side of the cylinder block of the engine 1 so that its axis extends to the right side of the vehicle. As a result, the DPF purification device 200, the exhaust gas introduction pipe 601, the exhaust gas outlet pipe 602, and the SCR purification device 300 are disposed outside the engine room, and a temperature drop is inevitable. A decrease in the temperature of the exhaust gas purification device adversely affects the exhaust gas purification performance.
In the forklift according to the embodiment, since the above heat insulation measures are taken, it is possible to suppress the temperature of the DPF purification device 200, the SCR purification device 300, and the connection pipes 601 and 602 connected to them from decreasing. it can. By insulating the heat from the exhaust gas from the external environment, the exhaust gas processing performance is prevented from being deteriorated.

The effect of the forklift with an exhaust gas purifying device of the first embodiment described above will be described.
(1) The work vehicle with an exhaust gas purifying device according to the first embodiment is installed in the engine housing space with a vehicle body frame 500 that forms an engine housing space below the driver's seat and a longitudinal axis in the vehicle longitudinal direction. The engine 1, the DPF purification device 200 that purifies the exhaust gas of the engine 1, and the second purification device 300 that further purifies the exhaust gas purified by the DPF purification device 200. The DPF purification device 200 is provided on an installation plate (first installation portion) 503 provided on the vehicle body frame 500 on the side of the engine 1, and the SCR purification device 300 is provided on the vehicle body frame 500 on the side of the engine 1. Provided on the installation plate (second installation portion) 504d.
With the above configuration, the DPF purification device 200 and the SCR purification device 300, which are heavy objects, can be installed in the vehicle body frame 500 without using a large support structure as in the prior art. The only members added to the body frame 500 are the installation plates 503 and 504d. Compared to the large support structure of the prior art, the support structure is light and simple.

(2) The installation plate 503 in the work vehicle with the exhaust gas purification device of the first embodiment is provided at a position below the cylinder head of the engine 1 and at a side position of the cylinder block. 200 is installed on the installation plate 503 with its axis 200AX extending in the vehicle left-right direction.
In the prior art, the DPF purification device and the SCR purification device are arranged at the rear of the engine and at the same height as the engine cylinder head, and their axes are both extended in the left-right direction of the vehicle, that is, in the direction perpendicular to the engine axis. It has been placed. The exhaust gas purification device, which is a heavy object, is at a high position and affects the stability of the vehicle. In the first embodiment, with the above configuration, the center of gravity of the vehicle can be lowered, and the stability of the vehicle is improved.
(3) The DPF purification device 200 of the work vehicle with the exhaust gas purification device of the first embodiment is installed on the installation plate 503 with its axis line 200AX extending in the vehicle left-right direction. Further, the vehicle body frame 500 includes a rear fender 506, the installation plate 504d is provided on the upper surface of the rear fender 506, and the SCR purification device 300 is installed on the installation plate 504d with its axis 300AX extending in the vehicle longitudinal direction. ing.
In the prior art, the axes of the DPF purification device and the SCR purification device are both extended in the vehicle left-right direction, that is, in a direction perpendicular to the engine axis. In the first embodiment, as described above, The axes of the DPF purification device 200 and the SCR purification device 300 were set to be orthogonal to each other. Therefore, it is possible to secure an arrangement space for the DPF purification device 200 and the SCR purification device 300, which are large and heavy objects, and to provide a forklift that meets advanced exhaust gas countermeasures.

(4) The vehicle outer side end portion of the DPF purification device 200 in the work vehicle with the exhaust gas purification device of the first embodiment protrudes outward from the opening 504b of the side panel 504a provided on the side of the vehicle body frame. And has a protruding end 203. The engine 1 and the DPF purification device 200 are connected by a first connecting pipe 601. The exhaust gas outlet port 202 of the projecting end 203 of the DPF purification device 200 and the exhaust gas inlet port 301 of the SCR purification device 300 have their axes aligned in the longitudinal direction of the vehicle. They are connected by a second connecting pipe 602 directed in the direction. The second connection pipe 602 is bent through the vehicle front side wall of the rear fender 506 and further through the rear fender 506 and the installation plate 504d, and is connected to the exhaust gas inlet port 301 of the SCR purification apparatus 300.
In the first embodiment, from the viewpoint of the degree of freedom in arrangement, the DPF purification device 200 is arranged such that its axis 200AX extends to the side of the vehicle on the side of the cylinder block, that is, on the side below the engine. On the other hand, the SCR purification device 300 is arranged on the upper surface of the rear fender 56 so that its axis 300AX extends in the vehicle front-rear direction. Therefore, the connection pipes 601 and 602 have been devised as described above. Therefore, in 1st Embodiment, the improvement of the arrangement | positioning freedom degree of the DPF purification apparatus 200 and the SCR purification apparatus 300 can be ensured.

(5) The vehicle body frame 500 in the work vehicle with an exhaust gas purifying device according to the first embodiment includes a step 504c projecting on the side of the vehicle, and includes the projecting end 203 of the DPF purifying device 200 and the connecting pipe 602. Is disposed in a space between the step 503c and the vehicle front side wall of the rear fender 506, and the space is covered with a cover 510 provided on the vehicle body frame 500 so as to be opened and closed.
In the first embodiment, from the viewpoint of the degree of freedom in arrangement, the DPF purification device 200 is arranged such that its axis 200AX extends to the side of the vehicle on the side of the cylinder block, that is, on the side below the engine. On the other hand, the SCR purification device 300 is arranged on the upper surface of the rear fender 56 so that its axis 300AX extends in the vehicle front-rear direction. As a result, the temperature of the DPF purification device 200, the SCR purification device 300, the connecting pipes 601, 602, etc. may be reduced. Therefore, in the first embodiment, the DPF purification device 200, the connection pipe 601 that connects the engine 1 and the DPF purification device 200, the connection pipe 602 that connects the DPF purification device 200 and the SCR purification device 300, and the SCR purification. There is a concern that the heat of the apparatus 300 is transferred to and radiated to the external environment and the temperature decreases. In the first embodiment, at least the protruding end 203 of the DPF purification device 200 and a part of the connection pipe 602 are covered with the heat insulating cover 510. As a result, it is possible to prevent the heat of the exhaust gas from escaping to the outside while ensuring the degree of freedom of arrangement of the DPF purification device 200 and the SCR purification device 300.

(6) In the work vehicle with an exhaust gas purification device according to the first embodiment, the connection pipe 601 that connects the engine 1 and the DPF purification device 200, and the second that connects the DPF purification device 200 and the SCR purification device 300. The connecting pipe 602 is covered with a heat insulating cover 602a.
With the above configuration, it is possible to suppress a decrease in gas temperature due to an extended exhaust gas path in order to improve the degree of freedom in arrangement.
(7) The DPF purification device 200 in the work vehicle with the exhaust gas purification device according to the first embodiment is installed with its axis extending in the left-right direction of the vehicle, and the SCR purification device 300 advances its axis forward and backward. It is installed extending in the direction.
With the above configuration, the degree of freedom of arrangement of the DPF purification device and the SCR purification device 300 is improved as described above.

(8) The work vehicle with an exhaust gas purifying device according to the first embodiment is installed in the engine housing space with the vehicle body frame 500 forming the engine housing space below the driver's seat and the longitudinal axis facing the vehicle forward and backward direction. The engine 1, the DPF purification device 200 that purifies the exhaust gas of the engine 1, and the SCR purification device 300 that further purifies the exhaust gas purified by the DPF purification device 200. The body frame 500 includes a bottom plate 501, a side wall 502, a right side cover 504, and the like that are main structures, an installation plate 503 provided on the main structure, and an installation plate 504d provided on the main structure. . The installation plate 503 is provided below the cylinder head of the engine 1 and at a side position of the cylinder block, and the DPF purification device 200 is installed on the installation plate 503. The installation plate 504d is provided at a rear position of the cylinder head of the engine 1 and at a side position of the cylinder head, and the SCR purification device 300 is installed on the installation plate 504d.
The work vehicle with the exhaust gas purifier having the above-described configuration is another aspect of the present invention. As described above, the center of gravity of the vehicle can be lowered to improve the stability, and the DPF purifier 200 and the SCR are combined. There exists an effect that the arrangement | positioning freedom degree of the purification apparatus 300 improves.

  In a work vehicle equipped with an exhaust gas purifying device having first and second purifying devices described in Patent Document 1, as shown in FIGS. The first purifier 2a is installed by a first support frame 100 fixed to the fuselage frame 94 above the radiator fan behind the engine and supported by the vibration isolator 34, and above the radiator fan at the rear of the radiator. The second purification device 2b is installed by the second support frame 105 fixed to the frame 94. The first and second purification devices, which are heavy objects of several tens of kilometers, are arranged above the vehicle, and the position of the center of gravity of the vehicle tends to be high, so it is necessary to pay attention to the stability during turning.

(9) The work vehicle with an exhaust gas purifying device according to the first embodiment is installed in the engine housing space with the vehicle body frame 500 forming the engine housing space below the driver's seat and the longitudinal axis facing the vehicle forward and backward direction. The engine 1, the DPF purification device 200 that purifies the exhaust gas of the engine 1, and the SCR purification device 300 that further purifies the exhaust gas purified by the DPF purification device 200. The DPF purification device 200 is installed with its axis extending in the left-right direction of the vehicle, and the SCR purification device 300 is installed with its axis extending in the vehicle longitudinal direction.
The work vehicle with an exhaust gas purifying device having the above configuration is still another aspect of the present invention, and has an operational effect that the degree of freedom of arrangement of the DPF purifying device 200 and the SCR purifying device 300 is improved.

  When the exhaust gas purification device having the first and second purification devices described in Patent Document 1 is mounted on a forklift, it is necessary to arrange the first and second purification devices compactly inside the vehicle body. In work vehicles such as forklifts that need to be equipped with first and second purification devices such as DPF purification devices and SCR purification devices, which are large and heavy objects, the space for mounting these two types of purification devices depends on the model. It is difficult to secure. In particular, when two types of exhaust gas purification devices are provided with a cylindrical container having a predetermined length, a configuration in which the axes are arranged in the same direction has been conventionally employed. .

-Second Embodiment-
The exhaust gas purifying apparatus according to the second embodiment will be described with reference to FIGS.
The exhaust gas purification apparatus of the second embodiment is installed using the internal space of the counterweight 800 behind the driver's seat. The DPF purification device 200 and the SCR purification device 300 are accommodated inside a counterweight 800 installed at the rearmost end of the vehicle body frame 500. Although not shown in detail, both the axis of the DPF purification device 200 and the axis of the SCR purification device 300 extend in the vehicle left-right direction. A connection pipe 603 is connected to the exhaust gas inlet port of the DPF purification device 200, and the other end of the connection pipe 603 is connected to an exhaust gas discharge port of the engine. The exhaust gas outlet port of the DPF purification device 200 and the exhaust gas inlet port of the SCR purification device 300 are connected by a pipe line (not shown). The DPF purification device 200 and the SCR purification device 300 are integrated and fixed to a mounting plate (not shown). By fixing this mounting plate to the rear of the vehicle body frame 500, the DPF purification device 200 and the SCR purification device 300 constituting the exhaust gas purification device 700 are installed.

The forklift according to the second embodiment described above can provide the following operational effects.
(1) The DPF purification device 200 and the SCR purification device 300 are installed using an internal space of a counterweight 800 attached to the rear of the driver's seat and the rear portion of the vehicle body frame 500. Therefore, the arrangement efficiency at the time of mounting the DPF purification apparatus 200 and the SCR purification apparatus 300 is improved by effectively utilizing the existing empty space.

The exhaust gas purification device for a forklift described above can be modified as follows.
(I) Although the DPF purification device 200 and the SCR purification device 300 are used, the exhaust gas purification device according to the present invention can be applied to a forklift equipped with various exhaust gas purification devices having two types of purification performance. it can.
(Ii) Although the axis 200AX of the DPF purification device 200 of the first embodiment is orthogonal to the axis 1AX of the engine 1, an embodiment that is substantially orthogonal is also included in the scope of the present invention.
(Iii) Although the axial line 300AX of the SCR purifying apparatus 300 of the first embodiment is the same as the axial line direction of the engine 1 as the axial line 1AX of the engine 1, an embodiment that substantially matches the vehicle longitudinal direction is also included in the present invention. Included in the range.
(Iv) Although the DPF purification apparatus 200 of the first embodiment is installed below the cylinder head of the engine 1, an embodiment in which the DPF purification apparatus 200 is arranged at a position slightly lower than the highest position of the cylinder head is also available. It is included in the scope of the present invention.
(V) In the first and second embodiments, the present invention has been described with respect to a forklift. However, the present invention can also be applied to a work vehicle other than a forklift, such as a wheel loader.

  In addition, the above description is an example to the last, and this invention is not limited to the said embodiment at all unless the characteristic of this invention is impaired. Therefore, the body frame 500 is not limited to the embodiment, and may be various forms.

DESCRIPTION OF SYMBOLS 1 ... Engine 200 ... DPF purification apparatus 201, 301a, 302a ... Exhaust gas inlet port 202, 302b ... Exhaust gas outlet port 203 ... Projection end 300 ... SCR purification apparatus 301, 302 ... Cylindrical container 500 ... Body frame 501 ... Bottom plate 502R, 502L ... Side wall 503 ... Installation plate 504 ... Right side cover 504a ... Side panel 504b ... Opening 504d ... Installation plate 504e ... Opening 506 ... Rear fender 506a ... Opening 510, 520 ... Thermal insulation cover 601, 602, 603 ... Connection pipe 602a ... Replaceable insulation cover 700 ... Exhaust gas purification device 800 ... Counterweight

Claims (9)

A vehicle body frame that forms an engine housing space below the driver's seat;
An engine installed in the engine housing space with the longitudinal axis directed in the vehicle longitudinal direction;
A first purification device for purifying the exhaust gas of the engine;
A second purification device for further purifying the exhaust gas purified by the first purification device,
The first purification device is provided in a first installation portion provided on the vehicle body frame on the side of the engine, and the second purification device is provided on a vehicle body frame on the side of the engine. A work vehicle with an exhaust gas purification device provided in the installation section. In the work vehicle with an exhaust gas purification device according to claim 1,
The first installation part is provided at a position below the cylinder head of the engine and at a side position of the cylinder block, and the first purification device is installed in the first direction with its axis extending in the vehicle left-right direction. Work vehicle with exhaust gas purification device installed in the section. In the work vehicle with an exhaust gas purification device according to claim 1 or 2,
The vehicle body frame includes a rear fender,
The second installation portion is provided on the upper surface of the rear fender, and the second purification device has an exhaust gas purification device installed in the second installation portion with its axis extending in the vehicle forward-rearward direction. vehicle. In the work vehicle with an exhaust gas purifying device according to claim 3, which refers to claim 2,
The vehicle outer side end of the first purification device has a protruding end that protrudes outward from the body frame from the side of the body frame,
The engine and the first purification device are connected by a first connecting pipe,
The exhaust gas outlet port at the protruding end of the first purification device and the exhaust gas inlet port of the second purification device are connected by a second connection pipe having an axis line in the vehicle front-rear direction, and the second connection pipe is A work vehicle with an exhaust gas purification device that is bent through the vehicle front side wall of the rear fender and further penetrates the upper surface of the rear fender and is connected to the exhaust gas inlet port of the second purification device. In the work vehicle with an exhaust gas purification device according to claim 4,
The vehicle body frame includes a step protruding on the side of the vehicle,
The protruding end of the first purification device and the second connecting pipe are disposed in a space between the step and the vehicle front side wall of the rear fender, and the space is provided to be openable and closable in the body frame. Work vehicle with exhaust gas purification device covered with open cover. In the work vehicle with an exhaust gas purification device according to any one of claims 1 to 5,
An exhaust gas purification device in which a first connection pipe connecting the engine and the first purification device and a second connection pipe connecting the first purification device and the second purification device are covered with a heat insulating cover Work vehicle with. In the work vehicle with an exhaust gas purification device according to claim 1,
The first purification device is installed with its axis extending in the vehicle left-right direction,
The second purification device is a work vehicle with an exhaust gas purification device that is installed with its axis extending in the vehicle longitudinal direction. A vehicle body frame that forms an engine housing space below the driver's seat;
An engine installed in the engine housing space with the longitudinal axis directed in the vehicle longitudinal direction;
A first purification device for purifying the exhaust gas of the engine;
A second purification device for further purifying the exhaust gas purified by the first purification device,
The vehicle body frame includes a main structure, a first installation part provided in the main structure, and a second installation part provided in the main structure,
The first installation part is provided at a position below the cylinder head of the engine and at a side position of the cylinder block, and the first purification device is installed in the first installation part,
The second installation portion is provided at a rear position of the cylinder head of the engine and at a side position of the cylinder head, and the second purification device is provided with an exhaust gas purification device installed at the second installation portion. Work vehicle. A vehicle body frame that forms an engine housing space below the driver's seat;
An engine installed in the engine housing space with the longitudinal axis directed in the vehicle longitudinal direction;
A first purification device for purifying the exhaust gas of the engine;
A second purification device for further purifying the exhaust gas purified by the first purification device,
The first purification device is installed with its axis extending in a direction orthogonal to the vehicle left-right direction,
The second purification device is a work vehicle with an exhaust gas purification device that is installed with its axis extending in the vehicle longitudinal direction.

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