JP6846331B2 - Construction machinery - Google Patents

Description

The present invention relates to a construction machine equipped with an exhaust gas treatment device for treating exhaust gas discharged from an engine.

In recent years, even in construction machinery such as wheel loaders and hydraulic excavators, selective catalytic reduction (SCR) technology using urea water as a reducing agent is used to reduce the amount of NOx contained in the exhaust gas discharged from the engine. Exhaust gas treatment is being carried out.

For example, Patent Document 1 describes an exhaust gas treatment device for treating exhaust gas, an injection device for injecting urea water as a reducing agent into the exhaust gas, a tank for storing urea water, and guiding urea water from the tank to the injection device. A wheel loader including a pipe and a pump provided in the middle of the pipe is disclosed. In this wheel loader, an exhaust gas treatment device and an injection device are arranged in the engine chamber, and a tank is arranged on the side of the ventilation chamber arranged behind the engine chamber. Further, the pump is attached to the lower part of the partition wall that separates the engine chamber and the ventilation chamber.

International Publication No. 2016/079773

In the wheel loader described in Patent Document 1, since the pump is attached to a partition wall adjacent to a high-temperature engine chamber, the heat effect on the pump is very large, and the quality of urea water may deteriorate. Therefore, it is desirable that the pump is stored in a place where the heat effect from the engine chamber is small, that is, a place as far as possible from the engine chamber. Therefore, for example, it is conceivable to store the pump together with the tank.

However, construction machinery has a permanent problem that the space around the so-called machine room such as the engine room and ventilation room is limited, and the size of the tank is limited in order to store the pump together with the tank. There must be. Therefore, it may not be possible to use a tank having a capacity capable of securing the amount of urea water required by the exhaust gas treatment device.

Therefore, an object of the present invention is to provide a construction machine capable of securing the required capacity of the reducing agent tank while suppressing the heat effect on the reducing agent pump.

In order to achieve the above object, the present invention comprises an engine, a cooling fan that sucks in outside air to generate cooling air, a heat exchanger that exchanges heat between the cooling air, and exhausted from the engine. An injection device that injects a reducing agent into the exhaust gas, a reducing agent tank in which the reducing agent is stored, a reducing agent pump that supplies the reducing agent stored in the reducing agent tank to the injection device, and the reduction. In a construction machine provided with a pair of supply / discharge pipes connecting the agent pump and the reducing agent tank and a reducing agent supply pipe connecting the reducing agent pump and the injection device, the engine and the injection device are provided. A heat exchanger room that houses the heat exchanger, a heat exchanger room that is provided behind the engine room at a distance from the engine room, and houses the heat exchanger and the cooling fan, and a side of the heat exchanger room. The heat exchanger chamber is provided separately from the heat exchanger chamber, and has a storage chamber for accommodating the reducing agent pump, the reducing agent tank, and the pair of supply / discharge pipes. A main body to which one end of the water supply / discharge pipe is connected and an overhanging portion extending horizontally from one end side in the vertical direction of the main body are integrally provided, and the overhanging portion is in front of the vehicle body. The reducing agent pump is arranged in the storage chamber so as to overhang, and the reducing agent pump is arranged in a space formed by the main body portion, the overhanging portion, and the side wall of the storage chamber on the front side of the storage chamber. To provide construction machinery.

According to the present invention, the required capacity of the reducing agent tank can be secured while suppressing the heat effect on the reducing agent pump. Issues, configurations and effects other than those described above will be clarified by the description of the following embodiments.

It is a side view which shows the appearance of the wheel loader which concerns on 1st Embodiment of this invention. It is a schematic diagram explaining the structure of the vehicle body rear part of a wheel loader. It is a perspective view which shows the inside of a storage room. The structure of the urea water tank is shown, (a) is a perspective view, (b) is a left side view, and (c) is a top view. It is a schematic view when the inside of a storage room is seen from the upper side of a car body. It is a schematic view when the inside of a storage room is seen from the left side of a car body. It is a schematic diagram when the inside of the storage chamber is seen from the left side of the vehicle body in the wheel loader which concerns on 2nd Embodiment of this invention.

Hereinafter, as one aspect of the construction machine according to the present invention, a wheel loader that excavates earth and sand, minerals, etc. and loads them onto a dump truck or the like will be described as an example.

<First Embodiment>
The configuration of the wheel loader according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 6.

(Overall configuration of wheel loader 100)
First, the overall configuration of the wheel loader 100 will be described with reference to FIGS. 1 to 3.

FIG. 1 is a side view showing the appearance of the wheel loader 100 according to the first embodiment. FIG. 2 is a schematic view illustrating the configuration of the rear portion of the vehicle body of the wheel loader 100. FIG. 3 is a perspective view showing the inside of the storage chamber 37.

The wheel loader 100 is an articulated construction machine that is steered by bending the vehicle body near the center. Specifically, as shown in FIG. 1, the front portion of the vehicle body composed of the front frame 102 and the rear portion of the vehicle body composed of the rear frame 103 are rotated in the left-right direction (vehicle width direction) by the center joint 101. It is freely connected, and the front frame 102 bends in the left-right direction with respect to the rear frame 103.

A pair of left and right front wheels 20 and a working machine 21 are provided on the front portion of the vehicle body. At the rear of the vehicle body, a pair of left and right rear wheels 30, a driver's cab 31 on which the operator rides, an engine chamber 32, a radiator chamber 33, a rear grill 34, and a counterweight 35 for maintaining a balance so that the vehicle body does not tilt. And are provided.

In the following, of the left and right directions of the wheel loader 100, the left direction when viewed from the operator sitting in the driver's seat of the driver's cab 31 is referred to as "left direction", and the right direction is referred to as "right direction". FIG. 1 shows only the left front wheel 20 and the rear wheel 30 among the pair of left and right front wheels 20 and the rear wheel 30.

The work equipment 21 includes a lift arm 211 that can rotate in the vertical direction, a pair of lift arm cylinders (not shown) that drive the lift arm 211 by expanding and contracting, and a bucket 212 attached to the tip of the lift arm 211. A bucket cylinder 212A that rotates the bucket 212 in the vertical direction with respect to the lift arm 211 by expanding and contracting, and a link mechanism that is rotatably connected to the lift arm 211 to form a link mechanism between the bucket 212 and the bucket cylinder 212A. It has a bell crank 213 and.

The engine chamber 32 and the radiator chamber 33 are spaces formed inside by covering the rear frame 103 from above with a cover 104, respectively. The radiator chamber 33 is provided behind the engine chamber 32 so as to be separated from the engine chamber 32, and as shown in FIG. 2, between the engine chamber 32 and the radiator chamber 33, both chambers are separated from each other. A partition wall 36 is provided. As a result, the heat generated in the engine chamber 32 is less likely to be transferred to the radiator chamber 33.

As shown in FIG. 2, in the engine chamber 32, the engine 321 and the exhaust gas treatment device 322 for treating the exhaust gas discharged from the engine 321 and ammonia as a reducing agent are added to the exhaust gas in the exhaust gas treatment device 322. An injection device 323 that injects urea water dissolved in the water is housed in the engine. In FIG. 2, the exhaust gas treatment device 322 and the injection device 323 are separately provided, but the present invention is not limited to this, and the injection device 323 may be provided in the exhaust gas treatment device 322.

The radiator chamber 33 has a radiator fan 331 as a cooling fan that sucks in outside air and generates cooling air, and a radiator 332 as a heat exchanger that exchanges heat between the cooling air generated by the radiator fan 331. This is an aspect of the heat exchanger room for storing.

When the radiator fan 331 is activated, the internal pressure of the radiator chamber 33 becomes lower than the atmospheric pressure around the wheel loader 100. As a result, outside air is sucked into the radiator chamber 33 from the holes and slits formed in the rear frame 103 and the cover 104, the openings of the engine chamber 32, and the like, and cooling air is generated. The radiator 332 uses this cooling air to cool the engine cooling water heated by the engine 321.

Further, the wheel loader 100 is provided on the left side of the radiator chamber 33 separately from the radiator chamber 33, and has a urea water tank 4 (reducing agent tank) in which urea water is stored and a urea water tank 4 in which urea water is stored. A storage chamber 37 for accommodating a urea water pump 5 (reducing agent pump) that supplies water to the injection device 323, and a pair of supply / discharge pipes 61 and 62 that connect the urea water tank 4 and the urea water pump 5. Have.

The storage chamber 37 is a box body surrounded by side walls in each of the vertical direction, the front-rear direction, and the left-right direction, and is fixed to the rear frame 103. Of the plurality of side walls of the storage chamber 37, the side wall facing the rear frame 103 is the "right wall 371", the side wall on the opposite side is the "left wall 372", and the side wall located in the front direction of the vehicle body is the "front wall". 373 ”, the side wall located in the rear direction of the vehicle body is referred to as“ rear wall 374 ”, the side wall located in the upward direction of the vehicle body is referred to as“ upper wall 375 ”, and the side wall located in the downward direction of the vehicle body is referred to as“ lower wall 376 ”.

As shown in FIG. 2, a wall hole 370 is formed in the right wall 371, and a frame hole 330 is formed in a portion of the rear frame 103 that covers the lower left side of the radiator chamber 33. The storage chamber 37 is fixed to the rear frame 103 so that the position of the wall hole 370 matches the position of the frame hole 330. The wall hole 370 and the frame hole 330 connect the internal space of the radiator chamber 33 and the internal space of the storage chamber 37.

In the present embodiment, the storage chamber 37 is provided with a removable lid 377. The lid 377 covers the internal space of the storage chamber 37 from the upper part, the front part, and the left part. Therefore, the left wall 372, the front wall 373, and the upper wall 375 of the storage chamber 37 are each composed of at least a part of the lid 377. Note that FIG. 3 shows the configuration of the storage chamber 37 with the lid 377 removed, and the lid 377 is attached so as to cover the opening portion.

The pair of supply / discharge pipes 61 and 62 are pipes for supplying urea water from the urea water tank 4 to the urea water pump 5 and discharging (returning) the urea water from the urea water pump 5 to the urea water tank 4. .. In FIG. 3, in the storage chamber 37, the pipe curved toward the left while intersecting is the supply pipe 61, and the pipe curved toward the right is the discharge pipe 62.

Further, as shown in FIG. 2, the urea water pump 5 and the injection device 323 are connected by a urea water supply pipe 60 (reducing agent supply pipe). Specifically, the urea water supply pipe 60 led out from the urea water pump 5 side passes through the wall hole 370 of the storage chamber 37 and the frame hole 330 (indicated by the broken line in FIG. 2) of the rear frame 103, and the radiator chamber 33. Is further connected to the injection device 323 through a through hole 360 formed in the partition wall 36. Therefore, the urea water stored in the urea water tank 4 is supplied to the injection device 323 through the supply pipe 61, the urea water pump 5, and the urea water supply pipe 60 in this order.

(Structure of urea water tank 4)
Next, the configuration of the urea water tank 4 will be described with reference to FIG.

4 (a) to 4 (c) show the configuration of the urea water tank 4, FIG. 4 (a) is a perspective view, FIG. 4 (b) is a left side view, and FIG. 4 (c) is a top view.

The urea water tank 4 integrates a main body 41 to which one ends of a pair of supply / discharge pipes 61 and 62 are connected, and an overhang 42 protruding horizontally from one end side in the vertical direction of the main body 41. Have in.

In the present embodiment, the main body 41 is formed in a substantially rectangular parallelepiped shape having a short side in a predetermined direction in the horizontal direction. On the upper surface of the main body 41, a connecting portion 41A for connecting one ends of the pair of supply / discharge pipes 61 and 62 is provided. Further, a supply port 41B for supplying urea water into the urea water tank 4 is provided at a corner between the upper surface of the main body 41 and the side surface having a short side.

In the present embodiment, the overhanging portion 42 projects from the lower end side of the main body portion 41 along the short side direction, and is formed in a substantially rectangular parallelepiped shape having a short side in the vertical direction. Therefore, the urea water injected from the supply port 41B gradually accumulates from the lower side of the overhanging portion 42 and the main body portion 41. Further, as shown in FIG. 4B, the urea water tank 4 has an inverted L shape when viewed from the side of the supply port 41B.

(Arrangement in storage room 37)
Next, the arrangement relationship of the urea water tank 4, the urea water pump 5, and the pair of supply / discharge pipes 61 and 62 in the storage chamber 37 will be described with reference to FIGS. 5 and 6.

FIG. 5 is a schematic view when the inside of the storage chamber 37 is viewed from the upper side of the vehicle body. FIG. 6 is a schematic view when the inside of the storage chamber 37 is viewed from the left side of the vehicle body. In FIG. 5, the side wall arranged between the left wall 372 and the front wall 373 is a part of the left wall 372.

The urea water tank 4 is arranged in the storage chamber 37 so that the main body 41 is located on the rear wall 374 side (rear of the vehicle body) and the overhanging portion 42 projects toward the front wall 373 (front of the vehicle body). There is. The urea water pump 5 is arranged in the space formed by the main body 41, the overhang 42, and the side walls (right wall 371, left wall 372, front wall 373, and upper wall 375) of the storage chamber 37 in the storage chamber 37. ing. In the present embodiment, the urea water pump 5 is arranged in the storage chamber 37 on the front side of the main body portion 41 and above the overhanging portion 42.

Specifically, as shown in FIG. 6, the urea water pump 5 is moved to the main body 41 (side surface of the main body 41) so that the position of the upper part of the urea water pump 5 is as close as possible to the position of the upper part of the main body 41. Of these, the surface of the storage chamber 37 facing the front wall 373) is fixed with a bolt 72 via a bracket 71.

The pair of supply / discharge pipes 61 and 62 are connected to the upper portion of the main body 41 and the upper portion of the urea water pump 5, respectively. In this way, since the pair of supply / discharge pipes 61 and 62 connect the upper part of the main body 41 located close to each other in the vertical direction and the upper part of the urea water pump 5, for example, the pair of supply / discharge pipes 61. It is not necessary to run the pair of supply / discharge pipes 61 and 62 on the side surface of the urea water pump 5, as in the case where one end of the urea water pump 5 is connected to the lower part of the urea water pump 5, respectively. Therefore, since the length of the pair of supply / discharge pipes 61 and 62 can be shortened, the arrangement of the pair of supply / discharge pipes 61 and 62 can be simplified and the cost can be reduced.

Further, as shown by the broken line in FIG. 6, the urea water pump 5 has a filter 50 that can be removed and replaced downward. A gap S larger than the size of the filter 50 (H1 shown in FIG. 6) along the vertical direction is formed between the urea water pump 5 and the overhanging portion 42 of the urea water tank 4. That is, the distance H2 between the lower surface of the urea water pump 5 and the upper surface of the overhanging portion 42 is longer than the length H1 of the filter 50 along the vertical direction (H2> H1). As a result, since the gap S is larger than the case where the gap S is smaller than the length H1 of the filter 50 along the vertical direction (H2 <H1), the filter 50 can be easily replaced.

As described above, the urea water pump 5 is stored in the storage chamber 37 provided on the side of the radiator chamber 33, which is located away from the engine chamber 32 and has a lower temperature than the engine chamber 32. The thermal effect on the pump 5 can be suppressed.

Further, the urea water tank 4 has a main body 41 and an overhanging portion 42, and the urea water pump 5 is arranged in the storage chamber 37 in a space formed by the main body 41, the overhanging portion 42, and the side wall of the storage chamber 37. By doing so, even if the urea water pump 5 is stored together with the urea water tank 4 in the storage chamber 37 having a limited size, the required capacity of the urea water tank 4 can be secured.

Further, by arranging the urea water pump 5 on the front side in the storage chamber 37, the distance between the urea water pump 5 and the injection device 323 can be shortened as compared with the case where the urea water pump 5 is arranged on the rear side in the storage chamber 37. it can. As a result, the length of the urea water supply pipe 60 can be shortened, the arrangement of the urea water supply pipe 60 can be simplified, and the cost can be reduced.

<Second Embodiment>
Next, the wheel loader according to the second embodiment of the present invention will be described with reference to FIG. 7. In FIG. 7, the same components as those described for the wheel loader 100 according to the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 7 is a schematic view of the wheel loader according to the second embodiment when the inside of the storage chamber 37A is viewed from the left side of the vehicle body.

In the present embodiment, in the urea water tank 4A, the overhanging portion 42A projects from the upper end side of the main body portion 41 in the horizontal direction (the short side direction of the main body portion 41). Then, as shown in FIG. 7, in the urea water tank 4A, the main body 41 is located on the rear wall 374 side (rear of the vehicle body), and the overhanging portion 42A projects toward the front wall 373 (front of the vehicle body). It is arranged in the storage room 37A so as to.

The urea water pump 5 is arranged in the storage chamber 37A on the front side of the main body portion 41 and below the overhanging portion 42A. In the present embodiment, the storage chamber 37A has an opening 378 which is openable and closable and has a size through which the filter 50 of the urea water pump 5 (indicated by a broken line in FIG. 7) can pass through, and the lower wall 376 (urea water). The filter 50 is taken out from the storage chamber 37A through the opening 378, which is provided on the bottom surface of the pump 5 and faces the lower surface of the pump 5.

Specifically, the opening 378 has a lid portion 378A that can be rotated in the vertical direction by a hinge, and the dimension W1 of the opening 378 along the front-rear direction of the vehicle body is along the front-rear direction of the vehicle body. It is formed larger than the dimension W2 of the filter 50 (W1> W2). By having the lid portion 378A of the opening portion 378, it is possible to prevent the inside of the storage chamber 37A from becoming dirty due to mud splashes or the like while the wheel loader is traveling.

In this case, unlike the gap S in the first embodiment, it is not necessary to provide a gap for the operator to enter when replacing the filter 50. Therefore, as compared with the urea water tank 4 in the first embodiment, A larger capacity of the urea water tank 4A can be secured.

The embodiments and modifications of the present invention have been described above. The present invention is not limited to the above-described embodiments and modifications, and includes various other modifications. For example, the above-described embodiments and modifications have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations. Further, it is possible to replace a part of the configuration of the present embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of the present embodiment. Furthermore, it is possible to add / delete / replace a part of the configuration of the present embodiment with another configuration.

For example, in the above embodiment, the urea water tanks 4 and 4A are arranged in the storage chambers 37 and 37A so that the overhanging portions 42 and 42A project to the front of the vehicle body, but the overhanging portions 42 and 42A are not necessarily arranged in the storage chamber. In 37 and 37A, it is not necessary to project to the front of the vehicle body, and the project may extend to the rear of the vehicle body or in the left-right direction.

Further, in the above embodiment, the storage chambers 37 and 37A are provided on the left side of the radiator chamber 33, but the present invention is not limited to this, and for example, the storage chambers 37 and 37A may be provided on the right side of the radiator chamber 33.

Further, in the above embodiment, the wheel loader has been described as an example of one aspect of the construction machine of the present invention, but the present invention is not limited to this, and for example, a hydraulic excavator or the like may be used.

4,4A: Urea water tank (reducing agent tank)
5: Urea water pump (reducing agent pump)
32: Engine room 33: Radiator room (heat exchanger room)
37, 37A: Storage chamber 41: Main body 42, 42A: Overhang 50: Filter 60: Urea water supply pipe (reducing agent supply pipe)
61, 62: A pair of supply and discharge pipes 100: Wheel loader (construction machine)
321: Engine 323: Injection device 331: Radiator fan (cooling fan)
332: Radiator (heat exchanger)
371: Right wall (side wall)
372: Left wall (side wall)
373: Front wall (side wall)
374: Rear wall (side wall)
375: Upper wall (side wall)
376: Lower wall (side wall)
378: Opening S: Gap

Claims (6)

An engine, a cooling fan that sucks in outside air to generate cooling air, a heat exchanger that exchanges heat between the cooling air, and an injection device that injects a reducing agent into the exhaust gas discharged from the engine. A pair of a reducing agent tank in which the reducing agent is stored, a reducing agent pump that supplies the reducing agent stored in the reducing agent tank to the injection device, and a pair of connecting the reducing agent pump and the reducing agent tank. In a construction machine provided with a supply / discharge pipe and a reducing agent supply pipe connecting the reducing agent pump and the injection device.
An engine chamber for accommodating the engine and the injection device,
A heat exchanger chamber provided behind the engine chamber at a distance from the engine chamber and accommodating the heat exchanger and the cooling fan.
It has a storage chamber provided on the side of the heat exchanger chamber at a distance from the heat exchanger chamber, and houses the reducing agent pump, the reducing agent tank, and the pair of supply / discharge pipes.
The reducing agent tank
The main body to which one end of the pair of supply / discharge pipes is connected, and
It integrally has an overhanging portion that projects horizontally from one end side in the vertical direction of the main body portion.
The overhanging portion is arranged in the storage chamber so as to overhang the front of the vehicle body.
The reducing agent pump
A construction machine characterized in that it is arranged in a space formed by the main body portion, the overhanging portion, and the side wall of the storage chamber on the front side of the storage chamber. In the construction machine according to claim 1,
In the reducing agent tank, the overhanging portion projects horizontally from the lower end side of the main body portion.
The reducing agent pump is a construction machine characterized in that it is arranged above the overhanging portion in the storage chamber. In the construction machine according to claim 2.
The reducing agent pump has a downwardly removable and replaceable filter.
A construction machine characterized in that a gap larger than the size of the filter along the vertical direction is formed between the reducing agent pump and the overhanging portion of the reducing agent tank. In the construction machine according to claim 2.
A construction machine characterized in that each of the pair of supply / discharge pipes connects an upper portion of the main body portion of the reducing agent tank and an upper portion of the reducing agent pump. In the construction machine according to claim 1,
In the reducing agent tank, the overhanging portion projects horizontally from the upper end side of the main body portion.
The reducing agent pump is a construction machine characterized in that it is arranged below the overhanging portion in the storage chamber. In the construction machine according to claim 5.
The reducing agent pump has a downwardly removable and replaceable filter.
A construction machine characterized in that the storage chamber is openable and closable and has an opening having a size through which the filter can pass on a bottom surface facing the lower surface of the reducing agent pump.

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