JPH0137146Y2 - - Google Patents

Description

[Detailed Description of the Invention] (A) Field of Industrial Application The present invention relates to the structure of a bonnet in which a muffler is installed in a tractor or the like, and more specifically relates to a baffle plate for cooling the muffler body, etc.

(b) Conventional technology Conventionally, there have been tractors with a muffler built into the bonnet, but as a countermeasure against the heat radiating from the muffler, these tractors have a large space inside the bonnet and a system that absorbs the heat of the muffler through the bonnet. To prevent the air from dissipating inside the muffler body,
It was covered in three layers.

(c) Problems that the invention aims to solve For this reason, mufflers are not installed on the bonnets of small tractors, which have complex structures, require large spaces, and have engines and other equipment arranged in a complicated manner. It was difficult to decorate the interior.

(d) Means for Solving the Problems The present invention aims to solve the above-mentioned problems by providing an upper part of the muffler body 21 which is installed inside the upper corner of the bonnet device 6 and extends in the longitudinal direction of the fuselage 3. A muffler baffle plate 25 is disposed to cover one side. When viewed from the front (see FIG. 1), the muffler baffle plate 25 has one side 25a that is larger than the muffler main body 21 and extends toward the center of the device 6 and along the bonnet cover 11.
The other side 25b is configured to be curved along the muffler body 21, and a large cooling air intake opening A that gradually becomes narrower is formed between the one side extension part 25a and the muffler body 21. In addition, when viewed from the side (see FIG. 2), the muffler baffle plate rear portion 25c is smoothly curved along the elbow 20, and the muffler baffle plate 25 and the muffler main body 21 have a substantially constant width between them. In addition to forming a cooling air flow path B, the muffler baffle plate 25 and the bonnet cover 11
A cooling air passage C having a substantially constant width is formed between the rear partition plate 12 and the rear partition plate 12.

(e) Effect Based on the above-mentioned configuration, the cooling air from the fan 30 is introduced and guided into the large cooling air intake port A, and then flows through the flow path B while increasing the cooling air speed as the flow path area gradually narrows. The muffler main body 21 is effectively cooled through. Further, the cooling air guided to the outside of the muffler baffle plate 25 smoothly passes through the flow path C having a substantially constant width without generating any stagnation or vortices, and passes through the baffle plate 25, the bonnet cover 11, and the like. The air cools the partition plate 12, joins with the cooling air from the flow path B, cools the exhaust manifold 20, and is then smoothly exhausted from the exhaust hole 11a formed in the bonnet cover 11.

(F) Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 3, the tractor 1 has a body 3 supported by wheels 2.
The front part is a bonnet device 6 on which the engine 5 is mounted, and the rear part is a handlebar 7.
It is a driver's seat 10 consisting of a seat 9 and a seat 9, etc.

The bonnet device 6 is shown in FIGS.
As shown in the figure, a bonnet cover 1 covers the top and sides of the device and is configured to be openable and closable.
1, and the rear of the device 6 has a partition plate 1.
It is separated from the fuel tank 13 by 2. Further, an engine 5 is housed within the bonnet device 6, and electrical components such as a starter switch 16 and a starter 17 are arranged on one side of the rear of the engine 5. An exhaust manifold 19 extends from one side of the upper part of the engine 5, and further extends upward and forward from the manifold 19 to which an elbow 20 is connected. Further, a muffler main body 21 is disposed at the upper corner of the bonnet device 6 on one side above the engine 5 and extends in the front-rear direction, and the muffler main body 21 is connected to an elbow 20 at the rear thereof. The front part thereof is connected to a muffler exhaust pipe 22 extending downward. A partition baffle plate 23 is fixed to one side of the engine 5, and the baffle plate 23 connects one side of the bonnet device 6 up and down, that is, the exhaust manifold 19 and the electrical components 16, 17.
It separates the two. Furthermore, the baffle plate 23 is installed diagonally so that the front side is high and the rear side is low, so that the hot air above the baffle plate 23 and the cold air below it do not mix with each other, and prevent stagnation and turbulence. The gas is smoothly guided into the intermediate exhaust hole 11a and the lower exhaust hole 11b formed on one side of the bonnet cover 11. Further, a muffler baffle plate 25 is disposed to cover the upper part and one side of the muffler main body 21 and the elbow 20. Then, the baffle plate 25
As shown in the figure, when viewed from the front, one side of the muffler main body 21 is larger than the muffler main body 21 and extends linearly toward the center of the device 6 and along the bonnet cover 11.
1, and the other side 25b is curved along the muffler body 21, and forms a relatively narrow flow path B with a constant width between the muffler body 21 and the muffler body 21. ing. Furthermore, a flow path C having a substantially constant width is formed between the baffle plate 25 and the bonnet cover 11. on the other hand,
The muffler baffle plate 25, as shown in FIG.
In the side view, the rear portion 25c is the elbow 20.
It is configured to smoothly guide the cooling air in the flow path B between the muffler body 21 and the intermediate exhaust hole 11a of the cover 11 without causing stagnation or turbulence. In addition, since the upper portion 12a of the partition plate 12 bulges forward, the bonnet cover 1 on the outside of the air guide plate 25
1 and the partition plate 12 is made to have a substantially constant width, and the cooling air is also smoothly routed through the intermediate exhaust hole 11.
It is configured to lead to a.

In the figure, 29 is a dustproof net disposed in front of the radiator 15, and 30 is a cooling fan disposed behind the radiator 15.

Since this embodiment has the above-described configuration, cooling air is sucked into the bonnet device 6 by the rotation of the cooling fan 30 based on the rotation of the engine 5.
Furthermore, the cooling air from which dust has been removed by the dustproof net 29 and which has cooled the radiator 15 flows toward the rear along the rotational direction E of the fan 30 as shown by the arrow. As a result, the air guided to the cooling air intake port A, which has a large inflow area between the muffler baffle plate 25 and the muffler body 21, gradually narrows its flow area and increases its flow velocity, resulting in a high-speed flow. The muffler main body 21 and elbow 20 are effectively cooled while passing through the flow path B. In addition, the wind guided to the outside of the muffler baffle plate 25 is smoothly guided by the flow path C of a constant width without accumulating or swirling, and the wind is guided to the outside of the muffler baffle plate 25, the bonnet cover 11, and the partition plate. 12, it merges with the muffler body cooling air from the previous flow path A at the cut point of the baffle plate 25. In addition, the cooling air cools the exhaust manifold 19, which is at the highest temperature, and further cools the partition air guide plate 2.
3, the cooling air that becomes hot air does not accumulate or become turbulent, and does not leak into the electrical components below the partition baffle plate 23.
The gas is smoothly discharged from the intermediate exhaust hole 11a of the bonnet cover 11. On the other hand, the cooling air flowing below the engine 5 does not have a high-temperature part, so it does not rise in temperature much, passes through the electrical components in a cold state, is guided to the partition baffle plate 23, and is guided to the lower exhaust hole of the cover 11. It is smoothly discharged from 11b.

(g) Effect of the invention As explained above, according to the invention, one side 25a of the muffler baffle plate 25 extends toward the center of the device 6 from the muffler main body 21 to form a large cooling air intake port A that gradually becomes narrower. while forming the other side 2
5b is curved along the muffler main body 21, and the rear portion 25c is smoothly curved along the elbow 20, so that the large amount of cooling air introduced into the intake port A is accelerated, and furthermore, the flow has a substantially constant width. Flows smoothly along path B without stagnation or turbulence,
The muffler body 21 can be effectively cooled,
Furthermore, the cooling air guided to the outside of the muffler baffle plate 25 flows smoothly along the flow path C having a substantially constant width without causing any stagnation or turbulence.
5. The bonnet cover 11 and the partition plate 12 can be effectively cooled. As a result, although it has an extremely simple configuration consisting of the muffler air guide plate 25, the muffler body 21, the air guide plate 25, the bonnet cover 11, etc. can be cooled, and the muffler body 21 can be installed internally even in a narrow space. The muffler internal bonnet device 6 can also be applied to the following. In addition, bonnet cover 11
Even when opened, the hot muffler body 21 and exhaust manifold 19 are exposed to the muffler baffle plate 2.
5, the baffle plate 25 itself is effectively cooled by the cooling air from inside and outside, and accidents such as burns to workers can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a bonnet device according to the present invention, FIG. 2 is a side view thereof, and FIG. 3 is an overall side view showing a tractor to which the present invention is applied. 1... Tractor, 3... Aircraft, 5... Engine, 6... Bonnet device, 11... Bonnet cover, 12... Partition plate, 16, 17... Electrical components, 19... Exhaust manifold, 20... elbow,
21...Muffler body, 23...Partition baffle plate,
25... Muffler baffle plate, 25a... One side extension part, 25b... Other side curved part, 25c... Rear curved part, A... Cooling air intake port, B... Cooling air flow path (inside), C...Cooling air flow path (outside).

Claims (1)

[Claims for Utility Model Registration] A muffler body 21 that houses the engine 5 mounted on the fuselage 3 and is connected to the engine via an elbow 20 is attached to the upper corner near the bonnet cover 11 at the front and rear of the fuselage. In the bonnet device 6 which extends in the direction and is installed internally, a muffler baffle plate 25 is disposed so as to cover the upper part and one side of the muffler main body 21, and the muffler baffle plate is further arranged to cover one side 25a of the muffler main body 21. is larger than the muffler body and extends toward the center of the bonnet device 6 and along the bonnet cover 11, and the other side 25b is curved along the muffler body, so that the one-side extending portion 25a and the muffler body are A large cooling air intake port A that gradually narrows between the muffler baffle plate 25 and the muffler body is formed, and the rear portion 25c of the muffler baffle plate is smoothly curved along the elbow 20 in a side view. A smooth cooling air flow path B having a substantially constant width is formed between the muffler baffle plate 25 and a cooling air flow path C having a substantially constant width on the outside of the muffler baffle plate 25.
A muffler interior bonnet device that forms a