JP5473362B2 - Industrial vehicle - Google Patents

Description

  The present invention relates to an industrial vehicle provided with an exhaust aftertreatment device.

  For industrial vehicles, diesel engines are mainly used for large vehicles with large loading capacity, but the exhaust gas from diesel engines contains a large amount of suspended particulate matter, causing air pollution. It has become.

  In order to solve such a situation, an exhaust aftertreatment device that removes suspended particulate matter from exhaust gas by a filter is provided in a diesel engine type industrial vehicle, for example, a forklift.

  As shown in FIG. 8, the forklift includes a cargo handling device (not shown) that performs cargo handling such as a lift, and a vehicle that is disposed under a driver's seat that operates the vehicle and the cargo handling and drives the vehicle and operates the cargo handling device. An engine 51 to be performed, a radiator 54 disposed behind the engine 51 for cooling the engine 51, a cooling fan 53 disposed between the engine 51 and the radiator 54 for sending cooling air to the radiator 54, and from the engine 51 toward the rear An exhaust pipe 56 that extends and guides the exhaust gas from the engine 51, and an exhaust aftertreatment device 57 that has a muffler that silences and exhausts the exhaust gas from the exhaust pipe 56 and has a filter that removes suspended particulate matter. A counterweight 52 is provided at the rear of the vehicle body to adjust the weight balance of the vehicle due to cargo handling. The exhaust after-treatment device 57 is disposed behind the radiator 54 and in front of the counterweight 52 so that the exhaust port faces rearward, so that high-temperature exhaust gas does not directly touch the radiator 54. It was.

JP-A-8-31335

  However, according to the above configuration, the influence of the high-temperature exhaust gas can be suppressed, but since the exhaust aftertreatment device is disposed downstream of the radiator as viewed from the cooling air, it is used as a response to future exhaust gas quaternary regulations. The large exhaust aftertreatment device obstructs cooling air to the radiator, and the conventional arrangement has a problem that the engine cooling efficiency is lowered.

  On the other hand, the exhaust aftertreatment device has a higher exhaust purification efficiency if the temperature of the exhaust gas is higher. However, in the conventional arrangement, the exhaust pipe from the engine to the exhaust aftertreatment device is long, and the exhaust aftertreatment device uses cooling air. Therefore, there is a problem that the temperature of the exhaust gas in the exhaust aftertreatment device is lowered and the exhaust purification efficiency is also lowered.

  Therefore, an object of the present invention is to provide an industrial vehicle capable of preventing a decrease in engine cooling efficiency of a radiator and exhaust purification efficiency of an exhaust aftertreatment device.

In order to solve the above problems, an industrial vehicle according to claim 1 of the present invention is disposed at a front part of a vehicle main body, a cargo handling device provided at the front of the vehicle main body, an engine disposed under the vehicle main body, and a rear of the engine. An industrial vehicle comprising a radiator for cooling an engine, a cooling fan disposed between the engine and the radiator for sending cooling air to the radiator, and a counterweight disposed at the rear of the vehicle body ,
An exhaust pipe that guides exhaust gas from the engine is arranged from the side of the engine toward the rear,
A single exhaust aftertreatment device connected to the tip of the exhaust pipe to mute the exhaust gas and remove suspended particulate matter from the exhaust gas by a filter , on the left or right side of the radiator and the above It is arranged in front of the counterweight .

  According to the configuration of each industrial vehicle, the exhaust aftertreatment device is not disposed behind the radiator, so that the cooling air from the cooling fan to the radiator flows smoothly without being obstructed, and the cooling efficiency of the engine is reduced. Can be prevented.

  In addition, since the exhaust aftertreatment device does not receive the cooling air from the cooling fan, the temperature reduction of the exhaust gas in the exhaust aftertreatment device can be suppressed, and the exhaust purification efficiency can be prevented from being lowered.

1 is a schematic side view of a forklift according to a first embodiment of the present invention. It is a side view which shows the engine part in the forklift. It is a principal part top view of the engine part in the forklift. It is a perspective view of the exhaust aftertreatment device in the forklift. It is a schematic side view of the forklift which concerns on Example 2 of this invention. It is a side view which shows the engine part in the forklift. It is a principal part top view of the engine part in the forklift. It is a principal part top view of the engine part in the forklift of a prior art example.

Below, the industrial vehicle which concerns on Example 1 of this invention is demonstrated based on FIGS. 1-4.
In the first embodiment, a case where the industrial vehicle is a forklift will be described.

  As shown in FIG. 1, the forklift 1 schematically includes a vehicle body 4 having a traveling wheel 2 provided at a lower portion and a driver seat 3 provided at an upper portion thereof, and a front portion of the vehicle body 4. A cargo handling device 6 that is disposed and handles by the fork 5, an engine 7 that is disposed below the driver's seat 3 and that serves as a drive source for driving the vehicle and operating the cargo handling device 6, and behind the engine 7 A radiator 10 for guiding the cooling water of the engine 7 through the pipe 11 and cooling the cooling water by the cooling fan 9 and the tip of the exhaust pipe 12 for releasing the exhaust gas from the engine 7 to the atmosphere. An exhaust aftertreatment device 13 for removing suspended particulate matter in the exhaust gas is provided, and a cowl for adjusting the weight balance of the vehicle due to cargo handling is provided at the rear of the vehicle body 4. Tar weight 8 is provided.

  The exhaust aftertreatment device 13 is disposed on one side of the engine 7 (left side in the present embodiment). The engine 7, the cooling fan 9, and the radiator 10 are arranged in order from the front to the rear.

Here, the exhaust aftertreatment device 13 will be described in detail with reference to FIG.
The exhaust after-treatment device 13 is disposed, for example, on a cylindrical member 13a connected to a rear end portion of the exhaust pipe 12, and an outer peripheral portion of the cylindrical member 13a, and collects suspended particulate matter in the exhaust gas. It is comprised from the collection material 13b (it is a filter) and the silencer 13c (it is a muffler) attached to the front-end | tip part of the said cylindrical member 13a.

  The arrangement of the exhaust aftertreatment device 13 will be described with reference to FIGS. 2 and 3. One end of the exhaust pipe 12 is connected to the left side of the exhaust manifold 14 above the engine 7, and the other end is connected to the engine 7. The exhaust after-treatment device 13 is accurately connected to the rear end portion of the exhaust pipe 12 in the front-rear direction. In other words, the cylindrical member 13a is connected so that the central axis thereof is in the front-rear direction.

  That is, as shown in the drawing, the exhaust aftertreatment device 13 is located on the left side of the engine 7 and in the rear position, specifically, from the cooling fan 9 to the vicinity of the radiator 10, that is, up to the front position of the counterweight 8. Are arranged as follows. In other words, it is arranged at a position away from the flow of cooling air by the cooling fan 9 and parallel to the flow.

  In the above configuration, when the engine 7 is started for running the vehicle, the exhaust gas from the engine 7 passes through the exhaust pipe 12 and the exhaust aftertreatment device 13 and is discharged to the outside behind the vehicle body 4. On the other hand, heat generated by the engine 7 is absorbed by the cooling water, and the cooling water is guided from the engine 7 to the radiator 10 through the pipe 11 and is radiated by the cooling air from the cooling fan 9.

The radiator 10 has a structure that allows the cooling air to pass through while increasing the surface area in order to improve the heat dissipation of the cooling water.
Since the exhaust aftertreatment device 13 is disposed at a position away from the cooling air flow and parallel to the flow, the cooling after the exhaust aftertreatment device 13 has passed through the radiator 10 as in the prior art. I do not receive air. That is, the flow of the cooling air from the cooling fan 9 to the radiator 10 flows smoothly without being obstructed, and therefore sufficient heat dissipation is performed by the radiator 10, thereby preventing the cooling efficiency of the engine 7 from being lowered. it can.

  Further, the exhaust aftertreatment device 13 cannot sufficiently remove suspended particulate matter from the exhaust gas, that is, the exhaust gas cannot be sufficiently purified when the temperature of the exhaust gas is lowered. Since the cooling air from 9 is not directly received, the temperature reduction of the exhaust gas can be suppressed, and the exhaust purification efficiency can be prevented from decreasing.

  Further, the exhaust aftertreatment device 13 requires periodic disassembly and cleaning in order to prevent clogging of the trapping material 13b that collects the suspended particulate matter from the exhaust gas. Since the exhaust aftertreatment device 13 is disposed at a position where it can be disassembled without attaching / detaching the counterweight 8, the disassembly and cleaning are facilitated and the maintainability is improved.

  Incidentally, in the present embodiment, the exhaust aftertreatment device 13 is arranged on the left side of the engine 7, but may be arranged on the right side.

Next, an industrial vehicle according to a second embodiment of the present invention will be described with reference to FIGS.
In the second embodiment, the case where the industrial vehicle is a forklift will be described.

  In the forklift 1 according to the first embodiment, the exhaust aftertreatment device 13 is arranged on the left side and the rear position of the engine 7 in order not to inhibit the cooling air to the radiator 10, whereas the forklift according to the second embodiment. 1, the exhaust aftertreatment device 13 is arranged closer to the boarding step 15 provided closer to the engine 7 and outside the vehicle body 4 to further suppress the temperature reduction of the exhaust gas. is there.

  Hereinafter, the forklift 1 according to the second embodiment will be described. However, the forklift 1 according to the second embodiment will be described with a focus on the arrangement of the exhaust aftertreatment device 13 which is different from the first embodiment. The description is omitted.

  That is, as shown in FIG. 5, on the left and right positions of the forklift driver's seat 3 and below the side surface of the outer plate 16 of the vehicle body 4, there are steps 15 and 15 Small auxiliary steps 18 are attached to the upper side, and mudguard hoods 17 are provided at both ends of the getting-on / off step 15 and at the rear side of the front wheel and the front side of the rear wheel. That is, because the boarding step 15 and the hood 17 and the inside of the vehicle body 4 are partitioned by the outer plate 16, a boarding space different from the inside of the vehicle body 4 is formed by the boarding / alighting step 15 and the hood 17. Has been.

  Next, the arrangement of the exhaust aftertreatment device 13 will be described with reference to FIGS. 6 and 7. One end of the exhaust pipe 12 is connected to the left side of the exhaust manifold 14 above the engine 7, and the other end is On the side surface of the outer plate 16 on the left side of the vehicle body 4 and on the upper surface of the step 15 for getting on and off, the rear side of the auxiliary step 18 extends rearward along the vehicle body center axis, and the exhaust pipe 12 The post-processing device 13 is connected in the front-rear direction.

  That is, as shown in the drawing, the exhaust aftertreatment device 13 is disposed on the left side of the engine 7 and on the side surface of the outer plate 16 and the upper surface of the step toward the rear hood 17. In other words, the exhaust aftertreatment device 13 is disposed outside the vehicle main body 4 and in front of the first embodiment, that is, in a space different from the cooling fan 9 and closer to the engine 7.

  In the above configuration, when the engine 7 is started for running the vehicle, the exhaust gas from the engine 7 passes through the exhaust pipe 12 and the exhaust aftertreatment device 13 and is released to the outside of the vehicle body 4. On the other hand, since the cooling air that has passed through the radiator 10 flows backward without being obstructed in the same manner as in the first embodiment, sufficient radiation is performed by the radiator 10, and a decrease in the cooling efficiency of the engine 7 can be prevented.

  Further, since the exhaust aftertreatment device 13 is disposed outside the vehicle main body 4 which is a separate space from the cooling fan 9, it does not receive any cooling air from the cooling fan 9 disposed inside the vehicle main body 4, and further the engine. Since the heat radiation from the exhaust pipe 12 is small, the temperature reduction of the exhaust gas is further suppressed, and therefore it is possible to effectively prevent the exhaust purification efficiency from being lowered.

In the present embodiment, the exhaust aftertreatment device 13 is arranged on the left side of the engine 7, but may be arranged on the right side.
Further, as the industrial vehicle according to each of the above embodiments, a forklift has been described, but a wheel loader may be used, for example.

DESCRIPTION OF SYMBOLS 1 Forklift 2 Wheel for driving 3 Driver's seat 4 Vehicle main body 5 Fork 6 Cargo handling device 7 Engine 8 Counterweight 9 Cooling fan 10 Radiator 11 Pipe 12 Exhaust pipe 13 Exhaust aftertreatment device 13a Cylindrical member 13b Collecting material 13c Silencer 14 Exhaust Manifold 15 Step for getting on and off 16 Outer plate 17 Hood 18 Auxiliary step

Claims (1)

A cargo handling device provided at the front of the vehicle body, an engine disposed below the vehicle body, a radiator disposed behind the engine for cooling the engine, and a cooling air disposed between the engine and the radiator for supplying cooling air to the radiator. An industrial vehicle provided with a cooling fan to be sent and a counterweight disposed at the rear of the vehicle body ,
An exhaust pipe that guides exhaust gas from the engine is arranged from the side of the engine toward the rear,
A single exhaust aftertreatment device connected to the tip of the exhaust pipe to mute the exhaust gas and remove suspended particulate matter from the exhaust gas by a filter , on the left or right side of the radiator and the above An industrial vehicle characterized by being arranged in front of a counterweight .

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