JP2023006172A - work vehicle - Google Patents

Abstract

To solve problems that due to that a guide cover for improving wind flow from an engine fan is not disposed in DPF of a conventional technique, residence of heat is generated, and DPF stability performance is lowered due to temperature rise around DPF, and to attain retention prevention of heat by guiding wind from an engine fan via a DPF front face and a DPF protective cover inside so as to promote heat flow.SOLUTION: In a work vehicle which includes an engine exhaust emission control device (DPF) (15) which discharges exhaust gas from an engine (E), and a protective cover (16) which covers the outside of the DPF (15), the front side of the DPF (15) is provided with a wind guide cover (20) which guides wind from an engine fan (14) via a DPF front face and a protective cover inside.SELECTED DRAWING: Figure 6

Description

The present invention relates to a work vehicle such as a combine harvester equipped with an engine exhaust purification device.

Engines are generally equipped with an exhaust gas cleaning system (DPF) that removes particulate matter in the exhaust gas, for example, as shown in US Pat.

Japanese Patent Application Laid-Open No. 2021-19530

Since the prior art DPF is not provided with a guide cover for improving the flow of air from the engine fan, there is a problem that heat is retained and the temperature around the DPF rises, degrading the stability performance of the DPF.

SUMMARY OF THE INVENTION An object of the present invention is to guide air from an engine fan through the surface of a DPF and the inside of a DPF protective cover, thereby promoting heat flow and preventing heat retention.

In order to solve the above problems, the present invention has taken the following technical means.

That is, the present invention according to claim 1 comprises an engine exhaust purification device (DPF) (15) for discharging exhaust gas from an engine (E) and a protective cover (16) for covering the outside of the DPF (15). The work vehicle is characterized in that a wind guide cover (20) is provided on the front side of the DPF (15) for guiding the wind from the engine fan (14) through the surface of the DPF and the inside of the protective cover.

The present invention according to claim 2 is characterized in that, in claim 1, the wind guide cover (20) is provided with a wind guide slanted plate (21) for guiding the wind from the bottom to the top. .

The present invention of claim 3 is characterized in that, in claim 1 or claim 2, the wind guide inclined plate (21) is set at an angle at which the wind blowing up from below strikes the DPF differential pressure sensor (17). Characterized by

In short, according to the present invention of claim 1, since the air from the engine fan is guided through the surface of the DPF and the inside of the protective cover, there is no heat retention, the air flows well, and the temperature around the DPF is lowered. can be suppressed, and the DPF stability performance due to the temperature drop is improved.

According to the present invention of claim 2, in addition to the effect of claim 1, the presence of the wind guide inclined plate causes the wind from the engine fan to be blown upward from the bottom, It spreads over the entire surface of the DPF and lowers the surrounding temperature, further improving work efficiency.

According to the present invention of claim 3, in addition to the effect of claim 1 or claim 2, since the wind guide inclined plate is set at an angle at which the wind blowing up from below hits the DPF differential pressure sensor, Not only the entire surface of the DPF but also the differential pressure sensor itself can maintain a good constant temperature and maintain stable performance.

1 is a front view of a general-purpose combine harvester according to an embodiment of the present invention; Side view of the DPF (exhaust gas purification device) of the same combine Perspective view of the wind guide cover and DPF of the same combine Side view of the DPF of the same combine Front view of main parts of the same DPF A perspective view of the relationship between the wind guide cover, the wind guide inclined plate, and the DPF in the same combine harvester. Perspective view of the relationship between the wind guide cover and the DPF in the same combine Perspective view of the operation unit equipped with a DPF in the same combine harvester

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a general-purpose combine harvester that throws in all of the harvested grain culms and threshes them as an example of a work vehicle. It's like

On the front side of a vehicle body 1 provided with a pair of left and right traveling crawlers 2, 2 in the lower part, there is a raking reel 4 with raking tines 3 for raking the crop stem culms rearward, and the stalk culms after raking are cut. It is provided with a pre-harvesting processing unit 8 including a clipper-type cutting blade device 5 and a raking auger 7 for raking the stalk culm after reaping onto a table 6 and the like.

A feed conveyor in a feeder house 10 installed from the left side to the rear of the pre-reaping processing unit 8 picks up the crop stem culms from the pre-reaping processing unit 8 and lifts and conveys them rearward and upward. It is designed to be put in.

On the right side of the feeder house 10, an engine cover on the engine room is equipped with a driving operation unit consisting of a driver's seat 11 and an operation box 12 in front of it, and behind it is a grain tank 13 for temporarily storing harvested crops. is installed.

An engine E is mounted below the driver's seat 11, and an engine fan (radiator fan) 14 for cooling the engine is provided on the outside thereof.

As will be described later, the exhaust port of the engine E is connected to an exhaust pipe of an exhaust purification device (hereinafter referred to as DPF) for discharging exhaust gas that has been combusted by the engine to the rear. It is equipped to discharge backwards in between.

As shown in FIGS. 2 to 6, the DPF 15 that discharges exhaust gas from the engine E is provided with a protective cover 16 that is open at the bottom and covers the upper side, left and right sides, and the DPF 15 in the protective cover. A DPF differential pressure sensor 17 is installed.

Reference numeral 18 denotes an exhaust pipe connected to the engine side, and 19 denotes a discharge side exhaust pipe.

A wind guide cover 20 is provided on the front side (engine side) of the DPF 15 to guide the wind from the engine fan 14 through the surface of the DPF 15 and the inside of the protective cover 16 . According to this, the wind that flows into the protective cover from the lower side does not diffuse outward from the DPF surface, so it concentrates on the flow on the DPF surface, increasing the flow velocity, enhancing the cooling effect, and eliminating heat retention. Therefore, the temperature around the DPF can be kept low, and the DPF stability performance is improved due to the temperature drop.

Further, the wind guide cover 20 is provided with a wind guide inclined plate 21 that guides air in an oblique direction from bottom to top (see the direction of arrow F in FIGS. 4 and 6). According to this, the wind spreads over the entire surface of the DPF, and the work efficiency is further improved due to the temperature drop in the surrounding area.

Further, the wind guide inclined plate 21 is set at an angle (an inclination angle of about 45 degrees) at which the wind blowing up from below in the direction of the arrow F hits the DPF differential pressure sensor 17 well. Therefore, not only the entire surface of the DPF but also the differential pressure sensor itself can maintain a good constant temperature, maintain stable performance, and can cope with heat soak.

In order to reduce the ambient temperature around the DPF differential pressure sensor 17, the shape of the protective cover 16 is made as large as possible and has a shape with an enlarged rear portion 16a.

An exhaust port 22 is provided above the rear portion of the protective cover 16 so that the air sent through the wind guide inclined plate 21 passes through the DPF differential pressure sensor 17 to cool it and is discharged from the exhaust port 22 to the outside of the machine. It has become.

A muffler is provided near the differential pressure sensor, and a partition plate is provided between the two to prevent hot air from the muffler from being blown to the DPF differential pressure sensor.

Further, as shown in the example of FIG. 7, the wind guide light path is provided with branching means 24 for branching the wind so that the wind sent via the wind guide inclined plate hits the three measurement sensors 23 of the DPF 15. It is

In the example of FIG. 8, the DPF 15 is arranged on the left side of the operation unit (reaping unit side), the exhaust pipe to the DPF is covered with an easily removable safety cover, and the lower part of the DPF projects from the operation unit side. The DPF protection cover 16 is supported by a supporting frame 25, and a heat insulating material is attached to the inner surface of the DPF protective cover 16 to enhance heat resistance.

As another example, conventionally, the radiator cover, the engine cover, and the driver's seat are integrally configured to swing rightward around the longitudinal axis on the lower end side, but the engine cover and the foot step. can be pivotally connected by a hinge to open and close by swinging about the axis in the front-rear direction, and the maintenance performance can be improved as in the conventional case.

Alternatively, the engine cover, the foot step, and the left foot side cover may be integrally connected by a hinge so as to swing open and close in the right direction.

E engine 14 engine fan 15 DPF (exhaust purification device)
16 protective cover 17 DPF differential pressure sensor 20 wind guide cover 21 wind guide inclined plate

Claims (3)

In a work vehicle provided with an engine exhaust purification device (DPF) (15) for discharging exhaust gas from an engine (E) and a protective cover (16) covering the outside of the DPF (15), the front side of the DPF (15) is provided with a wind guide cover (20) for guiding the wind from the engine fan (14) through the surface of the DPF and the inside of the protective cover (16). The work vehicle according to claim 1, wherein the wind guide cover (20) is provided with a wind guide slanted plate (21) for guiding the wind from the bottom to the top. 3. The work vehicle according to claim 1, wherein the inclined wind guide plate (21) is set at an angle such that the wind blowing up from below hits the DPF differential pressure sensor (17).

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