WO2016125201A1

WO2016125201A1 - Industrial vehicle

Info

Publication number: WO2016125201A1
Application number: PCT/JP2015/000447
Authority: WO
Inventors: 石田　裕之
Original assignee: 株式会社Kcm; 日立建機株式会社
Priority date: 2015-02-02
Filing date: 2015-02-02
Publication date: 2016-08-11

Abstract

An industrial vehicle equipped with: a machine chamber that includes an engine chamber and a ventilation chamber partitioned from each other by a partition wall; an engine arranged in the engine chamber; an exhaust gas passage that guides exhaust gas discharged from the engine to the outside of the engine chamber; a radiator arranged in the ventilation chamber, and between the engine and which a cooling agent is circulated; a fan that is arranged in the ventilation chamber and that generates a breeze that passes through the radiator; and a duct extending through the partition wall and having an inflow port that takes in the air that has passed through the radiator, and an outflow port that sprays the air flowing through the duct toward a machine forming a portion of the exhaust gas passage or an accessory attached to that machine.

Description

Industrial vehicle

The present invention relates to an industrial vehicle such as a wheel loader, a hydraulic excavator, or a bulldozer.

Conventionally, an industrial vehicle having a machine room including an engine room and a ventilation room partitioned by a partition wall is known. In general, an engine is disposed in the engine chamber, and a radiator for cooling the engine and a fan for generating wind passing through the radiator are disposed in the ventilation chamber.

For example, Patent Document 1 discloses an industrial vehicle configured to ventilate an engine room using a suction force of a fan. Specifically, in this industrial vehicle, a ventilation duct having one end opened in the engine room and the other end communicating with the outer peripheral side of the fan is provided.

Japanese Patent No. 5591303

By the way, the exhaust gas discharged from the engine is guided to the outside of the engine room through the exhaust gas path. A part of the exhaust gas path is constituted by devices such as an exhaust turbine and an exhaust gas treatment device, for example. Among such equipment and accessories attached to it, there are sites where it is desirable or necessary to keep the temperature low.

However, in the configuration in which the fan sucks the air in the engine room through the duct as in the industrial vehicle disclosed in Patent Document 1, even if the overall temperature in the engine room can be reduced, a part of the exhaust gas path is configured. The temperature of the equipment or its accessories cannot be reduced intensively. Further, in the configuration in which the fan sucks the air in the engine room through the duct, the amount of air passing through the radiator is reduced by the amount of air flowing through the duct, so that the heat dissipation efficiency of the radiator is lowered.

Then, this invention aims at providing the industrial vehicle which can reduce the temperature of the apparatus which comprises a part of exhaust gas path, or its accessory intensively, without reducing the thermal radiation efficiency of a radiator. To do.

In order to solve the above-described problems, an industrial vehicle of the present invention includes a machine room including an engine room and a ventilation room partitioned by a partition, an engine disposed in the engine room, and exhaust gas discharged from the engine. An exhaust gas path that leads to the outside of the engine room, a radiator that is arranged in the ventilation chamber and in which a coolant is circulated between the engine, and a wind that passes through the radiator that is arranged in the ventilation chamber are generated. A fan, a duct extending over the partition, an inlet for taking in air that has passed through the radiator, and air that has flowed through the duct are attached to a device that forms part of the exhaust gas path or the device And a duct having an outlet that jets toward the appendage.

According to said structure, since the air after passing a radiator is injected toward the apparatus which comprises some exhaust gas paths, or its accessory, the temperature of the apparatus or accessory can be reduced intensively. . Even if the temperature of the air after passing through the radiator is higher than the normal temperature, it is effective because it is sufficiently lower than the target temperature of the temperature reduction target portion. In addition, by using the air that has passed through the radiator, the above-described effects can be obtained without reducing the heat dissipation efficiency of the radiator.

The industrial vehicle further includes an exhaust gas treatment device including a selective catalyst reduction unit that constitutes a part of the exhaust gas path, and an electrical component unit attached to the exhaust gas treatment device, and the outlet of the duct May inject air flowing through the duct toward the electrical component unit. According to this configuration, components having a low endurance temperature (for example, sensor connectors) in the electrical component unit can be intensively cooled.

For example, when the front direction of the operator's cab and the opposite direction are the front and rear direction, the ventilation chamber is located behind the engine compartment, and the fan is arranged behind the radiator. A wind passing through the radiator may be generated.

The inflow port may be opened rearward, and the industrial vehicle may further include a wind direction changing member that guides air sent from the fan to the inflow port. According to this configuration, the ventilation chamber is not filled with air after passing through the radiator, and, for example, the urea water pipe laid in the ventilation chamber can be kept at a low temperature.

The fan may be a diffusion type that sends air not only to the rear but also to the surroundings, and the wind direction changing member may have a box shape that opens in a direction opposite to the rotation direction of the fan. According to this configuration, air can be caused to flow into the wind direction changing member using the flow in the rotational direction of the fan. In addition, the wind direction changing member can be arranged at a position that does not overlap the fan, and a smart layout can be realized.

The fan is surrounded by a shroud, and a rectangular frame-shaped blocking member that closes a gap between the shroud and the wall surface of the ventilation chamber is disposed, and the wind direction changing member is You may arrange | position at one corner part of a member. According to this configuration, the wind direction changing member can be disposed in a space where stagnation is likely to occur, and an efficient air flow can be formed.

According to the present invention, it is possible to intensively reduce the temperature of the equipment that constitutes a part of the exhaust gas path or its accessories without reducing the heat dissipation efficiency of the radiator.

It is a side view showing an industrial vehicle concerning one embodiment of the present invention. It is a side view which shows the internal structure of the machine room of the industrial vehicle shown in FIG. It is a top view which shows the internal structure of the machine room of the industrial vehicle shown in FIG. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIGS. 2 and 3. It is a side view which shows the internal structure of the machine room of the industrial vehicle of a modification. It is a side view which shows the internal structure of the machine room of the industrial vehicle of another modification.

FIG. 1 shows an industrial vehicle 1 according to an embodiment of the present invention. The industrial vehicle 1 of this embodiment is a wheel loader. However, the industrial vehicle of the present invention is not limited to a wheel loader, and may be another industrial vehicle such as a hydraulic excavator or a bulldozer.

Specifically, the industrial vehicle 1 includes a cab 12 provided on the vehicle body 11. Hereinafter, the front direction of the cab 12 and the opposite direction are referred to as the front-rear direction. The vehicle body 11 extends in the front-rear direction. The vehicle body 11 is provided with a front wheel 13 in front of the cab 12 and a rear wheel 14 behind the cab 12. A machine room 2 is provided on the vehicle body 11 behind the cab 12.

A bucket 17 is attached to the front portion of the vehicle body 11 via a boom 16. The boom 16 and the bucket 17 are each operated by a hydraulic cylinder, and hydraulic oil is supplied to these hydraulic cylinders from a hydraulic pump (not shown) driven by an engine 31 described later.

The machine room 2 is a substantially rectangular parallelepiped room that is sandwiched between the rear wheels 14 and has a relatively narrow width and extends in the front-rear direction. More specifically, the machine room 2 includes a front engine room 21 and a rear ventilation room 22 as shown in FIGS. 2 and 3. The engine chamber 21 and the ventilation chamber 22 are partitioned by a partition wall 23 in the front-rear direction.

An engine 31 is disposed in the engine chamber 21, and a radiator 32 for cooling the engine is disposed in the ventilation chamber 22. That is, a coolant is circulated between the engine 31 and the radiator 32.

In the ventilation chamber 22, the fan 33, which is disposed behind the radiator 32, generates wind passing through the radiator 32. In the present embodiment, the fan 33 generates wind passing through the radiator 32 from the front to the rear.

More specifically, the ventilation chamber 22 is provided with a first ventilation port 18 made up of a large number of holes on the top wall and three wall surfaces on the left and right sides, and a second ventilation port 19 made up of a number of holes on the rear surface. ing. Then, with the operation of the fan 33, wind flows from the first vent 18 toward the second vent 19. In addition, the 1st ventilation port 18 may be provided only in either one of the upper surface of the ventilation chamber 2B, or both right and left side surfaces. When the fan 33 is covered with a cover, the second vent hole 19 may be composed of rectangular openings formed between a plurality of horizontal bars and arranged vertically.

In the present embodiment, the partition wall 23 is bent in a substantially crank shape in a side view. However, the partition wall 23 may be flat in the vertical direction. Specifically, the partition wall 23 has a vertically extending lower portion facing the rear surface of the engine 3, an intermediate portion extending forward from the upper end portion of the lower portion and covering the rear portion of the engine 3 from above, and a distal end of the intermediate portion. Has an upper part that rises from. In other words, the engine chamber 21 protrudes toward the ventilation chamber 22 below the machine chamber 2, and the ventilation chamber 22 protrudes toward the engine chamber 21 above the machine chamber 2.

In the engine room 21, an exhaust gas path 4 that guides the exhaust gas discharged from the engine 31 to the outside of the engine room 21 is provided. In the present embodiment, the downstream portion of the exhaust gas path 4 is configured by the exhaust gas processing device 5, and the exhaust gas processing device 5 is connected to the engine 31 by the introduction pipe 41.

The exhaust gas treatment device 5 is disposed above the engine 31 and is supported by a frame (not shown). The engine chamber 21 is provided with a tail pipe 15 for discharging the exhaust gas treated by the exhaust gas treatment device 5 to the outside at the rear portion of the upper surface (substantially the center of the machine chamber 2).

The exhaust gas treatment device 5 performs selective catalytic reduction (SCR) using urea water as a reducing agent in order to reduce NO _x in the exhaust gas. More specifically, the exhaust gas treatment device 5 includes a pretreatment unit 51 and an SCR unit 53 that are arranged in parallel to each other. In the present embodiment, the preprocessing unit 51 and the SCR unit 53 extend in the front-rear direction and are aligned in the vehicle width direction. For example, the preprocessing unit 51 and the SCR unit 53 have a cylindrical shape. The upper part of the partition wall 23 described above faces the rear surfaces of the pretreatment unit 51 and the SCR unit 53.

However, the preprocessing unit 51 and the SCR unit 53 extend in the vehicle width direction and may be arranged in the front-rear direction. When the pretreatment unit 51 and the SCR unit 53 extend in the vehicle width direction, either the pretreatment unit 51 or the SCR unit 53 may be disposed between the engine 31 and the lower part of the partition wall 23. .

The pretreatment unit 51 accommodates a diesel oxidation catalyst (DOC: Diesel Oxidation Catalyst). DOC reduces carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas. The preprocessing unit 51 may have a diesel particulate filter (DPF: Diesel Particulate Filter) in addition to the DOC. Alternatively, the preprocessing unit 51 may be a single DPF. The introduction pipe 41 described above is connected to the front end portion of the pretreatment unit 51, and the rear end portion of the pretreatment unit 51 is connected to the front end portion of the SCR unit by a connection pipe 52.

A urea water injection device (for example, a dosing module) 57 is attached to the connection pipe 52. The urea water injection device 57 injects urea water into the exhaust gas flowing through the connection pipe 43. The urea water injection device 57 is supplied with urea water from a urea water tank (not shown). For example, the urea water pipe connecting the urea water tank and the urea water injection device 47 may be partially laid in the ventilation chamber 22 and penetrate the partition wall 23. The urea water injection device 57 is equipped with an electrical component that adjusts the urea spray amount. For example, the urea water injection device 57 includes a connector connected to a controller for spray amount control. In other words, the urea water injection device 57 is also an electrical component unit (attachment) attached to the exhaust gas treatment device 5.

SCR unit 53 reacts urea water injected into exhaust gas with exhaust gas. The rear end of the SCR unit 42 is connected to a discharge pipe 54 that extends upward into the tail pipe 15 described above.

Electrical component units (accessories) 55 and 56 are attached to the pretreatment unit 51 and the SCR unit 53, respectively. For example, each of the electric component unit 55 includes a NO _X sensor temperature sensor and with connectors with connector.

Furthermore, in the present embodiment, a configuration for intensively reducing the temperatures of the urea water injection device 57 and the

electrical component units

55 and 56 is employed. Specifically, a duct 6 extending over the partition wall 23 is provided in the machine room 2.

The duct 6 has one inflow port 6a that takes in the air that has passed through the radiator 32, and two

outflow ports

6b and 6c that inject the air that has flowed through the duct 6 toward the urea water injection device 57 and the

electrical component units

55 and 56. Have That is, the duct 6 includes one main flow portion 61 extending in the front-rear direction from a position behind the radiator 32 and two

branch portions

62 and 63 branched from the downstream end of the main flow portion 61. More specifically, one outlet 6 b injects air toward the electrical component unit 55 and the urea water injection device 57 attached to the pretreatment unit 51, and the other outlet 6 c is attached to the SCR unit 53. Air is jetted toward the electrical component unit 56.

In this embodiment, the duct 6 is constituted by piping. However, the duct 6 may be configured by a member that forms a flow path between the duct 6 and the cover that configures the machine room 2. In the present embodiment, the junction between the main flow portion 61 and the

branch flow portions

62 and 63 is located in the ventilation chamber 22 and the

branch flow portions

62 and 63 penetrate the upper part of the partition wall 23. A joint portion with the

branch portions

62 and 63 may be located in the engine chamber 21, and the main flow portion 61 may penetrate the upper portion of the partition wall 23.

The fan 33 described above is surrounded by the shroud 34. In this embodiment, as the fan 33, a diffusion type fan that sends air not only to the rear but also to the surroundings is used. For this reason, the rectangular frame-shaped closing member 7 is disposed around the shroud 34 so that the air sent out from the fan 33 does not flow forward from the periphery of the shroud 34.

As shown in FIG. 4, the closing member 7 is for closing gaps between the four walls of the upper surface, the left and right side surfaces, and the bottom surface of the ventilation chamber 44 and the shroud 34. Specifically, the closing member 7 includes an upper plate 71 disposed above the shroud 34, a lower plate 72 disposed below the shroud 34, a left plate 73 disposed on the left side of the shroud 34, and a shroud. 34 includes a right plate 74 arranged on the right side of 34. These plates 71 to 74 are slightly tilted so that the outer edge is located behind the inner edge.

In this embodiment, the fan 33 rotates counterclockwise when looking forward from behind. For this reason, the air sent out from the fan 33 to the surroundings forms a counterclockwise swirling flow.

The inlet 6a of the duct 6 described above is open toward the rear at the top of the right plate 74, which is one corner of the closing member 7. A wind direction changing member 8 is disposed on the upper portion of the right plate 74. The air direction changing member 8 is configured to guide the air sent out from the fan 33 to the surroundings to the inflow port 6a.

More specifically, the wind direction changing member 8 has a box shape that opens downward. That is, the opening direction of the wind direction changing member 8 is opposite to the rotation direction of the fan 33. For this reason, the swirl flow formed by the air sent out from the fan 33 to the surroundings flows into the wind direction changing member 8 and then flows into the inflow port 6a.

The wind direction changing member 8 may be disposed at other corners of the closing member 7 (upper part of the left plate 73, lower part of the left plate 73, lower part of the right plate 74). For example, when the wind direction changing member 8 is arranged on the upper portion of the left plate 73, the wind direction changing member 8 may be opened rightward so as to open in the direction opposite to the rotation direction of the fan 33.

As described above, in the industrial vehicle 1 of the present embodiment, the air after passing through the radiator is injected toward the urea water injection device 57 and the

electrical component units

55 and 56 attached to the exhaust gas treatment device 5, The temperatures of the urea water injection device 57 and the

electrical component units

55 and 56 can be reduced intensively. Even if the temperature of the air after passing through the radiator is higher than the normal temperature, it is effective because it is sufficiently lower than the target temperature of the temperature reduction target part (in this embodiment, the urea water injection device 57 and the electrical component units 55 and 56). It is. In addition, by using the air after passing through the radiator, the above effect can be obtained without reducing the heat dissipation efficiency of the radiator 32.

Furthermore, by injecting air toward the urea water injection device 57 and the

electrical component units

55 and 56, components having a low endurance temperature in the urea water injection device 57 and the electrical component units 55 and 56 (for example, sensor connectors) Etc.) can be intensively cooled.

Further, in this embodiment, since the wind direction changing member 8 is arranged at one corner of the closing member 7, the wind direction changing member 8 can be arranged in a space where stagnation is likely to occur. Thereby, an efficient air flow can be formed. However, it is also possible to arrange the wind direction changing member 8 at, for example, the central portion of any of the plates 71 to 74 constituting the closing member 7.

(Modification)
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

For example, as shown in FIG. 5, a linear flow type fan that sends air only backward may be used as the fan 33. In this case, a bent pipe integrally formed with the duct 6 may be used as the wind direction changing member 8. However, if the fan 33 is a diffusion type and the wind direction changing member 8 that opens in the direction opposite to the rotation direction of the fan 33 is provided as in the above embodiment, the flow in the rotation direction of the fan 33 is used, Air can be caused to flow into the wind direction changing member 8. In addition, the wind direction changing member 8 can be disposed at a position that does not overlap the fan 33, and a smart layout can be realized.

Alternatively, as shown in FIG. 6, the fan 33 may generate a wind passing through the radiator 32 from the rear to the front. In this case, the duct 6 may be configured such that the inflow port 6 a opens toward the radiator 32 in front of the radiator 32. However, if the fan 33 generates wind passing through the radiator 32 from the front to the rear as in the above embodiment, the inside of the ventilation chamber 22 is not filled with the air after passing through the radiator. Therefore, for example, the urea water pipe laid in the ventilation chamber 22 can be kept at a low temperature.

Also, the duct 6 does not necessarily have both the

outlets

6b and 6c, and may have only one of them. Moreover, the exhaust gas treatment device 5 does not necessarily need to execute SCR, and may be a simple filter unit.

Also, the outlet of the duct 6 does not necessarily have to inject air toward the electrical component unit attached to the exhaust gas treatment device 5. For example, when a part of the exhaust gas path 4 is configured by an exhaust turbine, the outlet of the duct 6 may inject air toward the exhaust turbine.

DESCRIPTION OF SYMBOLS 1 Industrial vehicle 2 Machine room 21 Engine room 22 Ventilation room 23 Bulkhead 31 Engine 32 Radiator 33 Fan 34 Shroud 4 Exhaust gas path 5 Exhaust gas treatment device 53

SCR unit

55,56 Electrical component unit (accessory)
57 Urea water injection device 6

Duct 6a Inlet

6b, 6c Outlet 7 Blocking member 8 Wind direction changing member

Claims

A machine room including an engine room and a ventilation room partitioned by a partition;
An engine disposed in the engine compartment;
An exhaust gas path for guiding the exhaust gas discharged from the engine to the outside of the engine room;
A radiator disposed in the ventilation chamber and in which a coolant is circulated with the engine;
A fan disposed in the ventilation chamber for generating wind passing through the radiator;
A duct extending over the partition, the inlet for taking in air that has passed through the radiator, and the air that has flowed through the duct to a device that forms part of the exhaust gas path or an accessory attached to the device A duct having an outlet for jetting toward the
An industrial vehicle comprising:
An exhaust gas treatment apparatus including a selective catalyst reduction unit, which constitutes a part of the exhaust gas path;
An electrical component unit attached to the exhaust gas treatment device,
The industrial vehicle according to claim 1, wherein the outlet of the duct injects air flowing through the duct toward the electrical component unit.
When the front direction of the cab and the opposite direction are the front and rear direction, the ventilation chamber is located behind the engine chamber,
The industrial vehicle according to claim 1, wherein the fan is disposed behind the radiator and generates wind passing through the radiator from the front toward the rear.
The inflow opening is open toward the rear;
The industrial vehicle according to claim 3, further comprising a wind direction changing member that guides air sent from the fan to the inflow port.
The fan is a diffusion type that sends air not only to the rear but also to the surroundings,
The industrial vehicle according to claim 4, wherein the wind direction changing member has a box shape that opens in a direction opposite to a rotation direction of the fan.
The fan is surrounded by a shroud;
Around the shroud, a rectangular frame-shaped blocking member that closes a gap between the wall of the ventilation chamber is disposed,
The industrial vehicle according to claim 5, wherein the wind direction changing member is disposed at one corner portion of the closing member.