JPH0842340A - Air discharging structure of engine room in working vehicle and the like - Google Patents

Abstract

PURPOSE:To prevent overheating of the inside of an engine room by efficiently discharging cooling air of a muffler in the engine room. CONSTITUTION:A ventilating mechanism of cooling draft is provided in an engine room covered by a room cover 3, and a muffler 8 is provided in the ventilating direction, and an air discharging passage 15 is formed between the muffler 8 and the room cover 3, and an air discharging window 22 is formed on the room cover 3. The air discharging passage 15 is formed by inclining the air discharging passage wall surface in relation to the air discharging window 22, so that its draft upstream may be wider, and the downstream may be narrower.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust structure for an engine room of a work vehicle such as a tractor.

[0002]

2. Description of the Related Art Conventional work vehicles such as tractors have been
There are many cases where an engine exhaust muffler is installed in the engine room, but its mounting structure is installed in the hood side cover in the front-rear direction parallel to the side cover, and the inside of the exhaust window of the side cover and the muffler are installed. It is known that a hot air exhaust passage is formed between the corresponding outer peripheral surface or a heat shield plate provided on the outer periphery of the muffler. In the exhaust passage, the outer peripheral surface of the muffler or the outer peripheral surface of the heat shield plate and the inner surface of the side cover are substantially parallel to each other.

[0003]

However, when the tractor is traveling or the engine is operating, exhaust air is introduced from the front grill of the bonnet and flows into the exhaust passage to discharge hot air around the muffler to the outside. In the state where the peripheral walls of the ventilation passage are parallel, hot air is sent to the rear and is not efficiently discharged from the exhaust window and stays in the engine room, causing overheating of internal equipment, or the hot air inside is rearward. There was a problem that it leaked to the vicinity of the driver's seat and deteriorated the work environment.

[0004]

According to the exhaust structure of the present invention for solving the above-mentioned problems, the engine chamber 6 covered with the room cover 3 is provided with a ventilation mechanism for cooling the inside thereof. A muffler 8 is provided in the room 6 along the ventilation direction, an exhaust passage 15 is formed between the muffler 8 and the room cover 3, and an exhaust window 22 is formed in the room cover 3 in the exhaust passage 15. In what I did,
The exhaust passage 15 is formed by inclining the wall surface of the exhaust passage with respect to the exhaust window 22 so that the upstream side of the exhaust passage 15 is wide and the downstream side is narrow.

[0005]

When the ventilation mechanism operates in the engine room 6 due to the operation of the engine 7 or the traveling of the vehicle, the ventilation upstream side is widened and the downstream side is narrowed between the muffler 8 and the room cover 3. The exhaust air passage 15 formed by inclining the exhaust air passage wall surface with respect to the wind window 22 guides the cooling exhaust air to the air exhaust window 22 of the room cover 3 so that the hot air accumulated in the engine room 6 can be efficiently discharged. Discharge.

[0006]

1 shows a tractor 1 to which the mechanism of the present invention is applied. An engine room 6 surrounded by a bonnet 2, a side cover (room cover) 3 and a chassis 4 is formed under a hood 2. Figure 2 in the engine room 6
As shown in, engine 7, muffler 8, radiator 9
Etc. are installed inside, and a grill 11 is installed in front of them. A driver's seat 12 is provided behind the bonnet 2, and a driving force is obtained by operating the engine 7 from the driver's seat 12, and the driving force is transmitted to the driving wheels 14 or 14 and 16 via the transmission 13 to drive the vehicle. Seat 12
The tractor 1 is run while steering by rotating the steering handle 17 protruding from the front part.

From the muffler 8 installed in the bonnet 2 as shown in FIGS. 2, 3 and 4, the tail pipe 1
8 protrudes and is configured to discharge the exhaust gas obliquely forward and downward. A heat shield plate 19 is attached to the muffler 8 by mounting bolts 21 as shown in FIG. 5, and the heat shield plate 19 has a substantially horizontal top plate 19a and a substantially vertical side plate 19b which are angled when viewed from the front. Of the side cover 19 having a circular cross section, and the gap between the inner surface of the side cover 3 and the outer surface of the side plate 19b is wide at the front and narrow at the rear.
Are formed. That is, in plan view, the side plate 19b is obliquely angled with respect to the side cover 3 so as to become gradually narrower from the front toward the rear. Further, the side cover 3 in the side surface direction of the heat shield plate 19 is provided with an exhaust window 22 having a grill shape or provided with punching metal or the like. The outer surfaces of the heat shield plate 19 forming the wall surface of the are inclined so as to face each other.

The temperature in the engine room 6 is controlled by the operation of the engine 7 while the tractor 1 is operating.
The temperature itself becomes high, and this high-temperature hot air flows into the engine room 6.
In addition to accumulating inside and adversely affecting the equipment, there is a problem that hot air also leaks to the driver's seat. The exhaust window 22 is installed to discharge the hot air, but it is very difficult to efficiently discharge the hot air.

On the other hand, according to the above mechanism, when a cooling fan (not shown) operates together with the engine 7 or the tractor 1 travels, exhaust air flows from the grill 11 through the radiator 9 and hits the heat shield plate 19. At this time, since the heat shield plate 19 is obliquely angled with respect to the side cover 3, the exhaust air flowing into the exhaust passage 15 hits the outer surface of the heat shield plate 3 and changes in the direction of the exhaust window 22. Then, the hot air collected in the engine room 6 is caused to flow out from the exhaust window 22. As a result, very high exhaust efficiency and engine room 6
The effect of preventing internal temperature rise and the improvement of the cooling performance of the entire engine 7 can be obtained, the engine 7 and other devices can be operated without overheating, and hot air does not leak to the vicinity of the driver's seat.

FIGS. 6 and 7 show an example in which the outer surface of the muffler 8 is inclined with respect to the inner surface of the side cover 3 to form an exhaust passage 15, and the muffler 8 is provided with respect to the side cover 3. And the gap between the side cover 3 is wide in the front,
It is installed so that it becomes narrower at the rear. That is, the muffler 8 itself is obliquely attached to the side cover 3 in a plan view.
The left outer peripheral surface and the inner surface of the side cover 3 form an exhaust path 15. The other configurations are common to those shown in FIGS. 1 to 5, and therefore the description thereof will be omitted.

According to this structure, the cooling air that has flowed into the exhaust passage 15 hits the right side surface of the muffler 8, and at this time the muffler 8 is attached to the side cover 3 at an angle with respect to the side cover 3. The flow of the cooling wind hitting the right side surface of the muffler 8 is changed in the direction of the exhaust air window 22 so that the inflowing cooling air flows out in a certain direction from the exhaust air window 22. It has become.

8 and 9 show an example in which a plurality of rectifying plates 25 are attached to the side plate 19a of the heat shield plate 19, and the muffler 8 includes
As shown in FIG. 9, a heat shield plate 19 having a gate-shaped cross section in a front view is attached by mounting bolts 21 so as to surround the upper portion of the muffler 8 in three directions of left and right sides. The straightening plate 25 of the above is tilted with the front side up and the rear side down, and is attached by the adjusting screw 27 through the adjusting hole 26 which is a long hole so that the inclination angle can be adjusted. When the exhaust air rotates and the exhaust air flows through the exhaust passage 15, the direction of the exhaust air is changed obliquely downward and rearward by the straightening plate 25, and the hot air in the engine room 6 generated from the engine 7 and the like follows the direction of the exhaust air flow. It is configured to be smoothly discharged from the opening below the bonnet 2.

[0013]

According to the present invention configured as described above, when the ventilation mechanism performs ventilation in the engine room due to the operation of the engine or the running of the vehicle, the room outside the muffler is radiated at high temperature. Due to the inclined ventilation passage on the inner surface side of the cover, the exhaust air for cooling is efficiently exhausted to the outside while being guided to the exhaust window of the room cover.

Therefore, the cooling effect of the outer periphery of the muffler is enhanced, hot air does not stay in the engine, overheat of the engine and other equipment is prevented, and the amount of hot air flowing from the engine room to the driver's seat is reduced. is there.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a tractor.

FIG. 2 is a perspective view in which the inside of the bonnet is seen through.

FIG. 3 is a plan view of a hood exhaust passage section.

FIG. 4 is a right side view of a hood exhaust passage section.

FIG. 5 is a view taken in the direction of arrows AA in FIG. 4;

FIG. 6 is a plan view of a bonnet showing another exhaust structure.

FIG. 7 is a right side view of the bonnet.

FIG. 8 is a right side view of the air exhaust unit with the current plate.

FIG. 9 is a front view of an air exhaust unit with a current plate.

[Explanation of symbols]

 3 Room cover (side cover) 6 Engine room 8 Muffler 15 Ventilation path 22 Exhaust window

Claims (1)

[Claims] 1. An engine room (6) covered with a room cover (3) is provided with a ventilation mechanism for cooling air inside, and a muffler (8) is provided in the engine room (6) along the ventilation direction. And an exhaust passage (15) is formed between the muffler (8) and the room cover (3), and an exhaust window (22) is formed in the room cover (3) in the exhaust passage (15). The exhaust path (15)
An exhaust structure for an engine room in a work vehicle or the like formed by inclining the exhaust passage wall surface with respect to the exhaust window (22) so that the ventilation upstream side is wide and the downstream side is narrow.