JPH10288036A - Ventilating device in engine room and industrial vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ventilating device in an engine room of an industrial vehicle capable of easily reducing noise leaking to the outside of an engine while maintaining ventilating air necessary to cool the engine in the engine room. SOLUTION: A ventilating device 30 is provided with a valve unit 8 which is formed integrally with a valve 12 mounted to multiple air sucking holes 11 made in a mounting plate 10. Also the valve unit 8 is arranged so that the valve 12 is positioned at the height of the shaft of a cooling fan 4. The valve unit 8 is mounted so that a distances between each valve 12 and cooling fan 4 are different from each other. The valve 12 is formed integrally out of rubber. The valve 12 is formed so that, when an inside pressure is larger than an outside pressure, its end side is deformed to the outside and an opening area is increased. In addition, the valve 12 is mounted to the sucking holes 11 so that its top end side is positioned on the engine room 3 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation device for an engine room and an industrial vehicle.

[0002]

2. Description of the Related Art In an engine room of an industrial vehicle, for example, a forklift, an intake hole for introducing outside air for cooling an engine is provided. The intake hole is formed by opening a hole of a fixed diameter in the engine hood or the frame, and this hole secures ventilation required for cooling the engine.

[0003]

However, since the intake hole has only a fixed size, the intake hole is largely opened even during idling or the like, and is generated from the engine. There was a problem that the noise was leaked outside the engine room more than necessary.

[0004] A method of opening and closing the intake hole using an actuator is also conceivable. However, a control device for controlling the actuator is required in addition to the actuator, which complicates the configuration and increases the manufacturing cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide ventilation necessary for cooling an engine in an engine room and noise to leak outside the engine room. It is an object of the present invention to provide a ventilation device for an engine room in an industrial vehicle, which can easily reduce the load.

[0006]

According to a first aspect of the present invention, there is provided an industrial vehicle in which an intake hole is provided in a wall constituting an engine room for communicating the engine room with the outside. In the vehicle, a plurality of the intake holes are provided, and a valve formed so that an opening area can be automatically increased or decreased based on a pressure in the engine room is attached to the intake hole.

According to a second aspect of the present invention, in the first aspect of the present invention, the valve is integrally formed of rubber, and when the inner pressure is higher than the outer pressure, the distal end is deformed outward. The opening is formed so as to increase the opening area, and is attached to the intake hole such that the front end side is the engine room side.

According to a third aspect of the present invention, in the first or second aspect, the valve is provided at a position corresponding to the height of a shaft of a cooling fan provided in the engine. According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, each of the valves is provided so as to have a different distance from the cooling fan.

According to the fifth aspect of the present invention, the first to fourth aspects are provided.
In any one of the inventions described above, the ventilation device includes a valve unit in which the intake hole is provided in a mounting plate, and the valve is attached to the intake hole, and the unit is integrally united.

According to a sixth aspect of the present invention, there is provided an industrial vehicle including the engine room ventilation device according to any one of the first to fifth aspects. Therefore, according to the first to fifth aspects of the present invention, when the engine operates and the cooling fan rotates, the pressure in the engine room is reduced. When the pressure in the engine room is reduced, the outside air pushes and opens the valve, and the opening area of the valve increases. Conversely, when the engine speed decreases, the pressure in the engine room increases, and the opening area of the valve decreases. Therefore, the opening area of the valve is automatically changed based on the pressure in the engine room. In addition, when the engine is running at a low speed, such as during idling, the opening area of the valve is reduced, and noise is less likely to leak out of the engine room.

According to the second aspect of the present invention, when the pressure inside the valve is higher than the pressure outside, the distal end is deformed outward and the opening area increases. Further, the valve is integrally formed of rubber, so that the valve can be easily manufactured.

According to the third aspect of the present invention, since the valve is provided at the height of the shaft of the cooling fan, the valve is easily affected by the cooling fan. According to the fourth aspect of the present invention, the vicinity of the cooling fan is easily affected by the decompression action, and the valves are sequentially opened from the valve near the cooling fan.

According to the fifth aspect of the present invention, since a plurality of valves are provided as a unitized valve unit, it can be easily mounted on an industrial vehicle. In the industrial vehicle according to the sixth aspect, the function corresponding to any one of the first to fifth aspects is exhibited.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, an engine room 3 is provided between wheels 2 of a forklift 1 as an industrial vehicle. An engine 5 having a cooling fan 4 is arranged in the engine room 3. The engine 5 is covered with an engine hood 6 forming an upper wall of the engine room 3. The engine hood 6 is configured to be openable and closable. The frame 7 constituting the wall of the engine room 3 is provided with notches 7 a at positions corresponding to both sides of the forklift 1. The valve unit 8 constituting the ventilation device 30 is attached to the notch 7a. The valve unit 8 is arranged such that its upper surface is flush with the upper surface of the frame 7. The valve unit 8 and the frame 7 are fixed by welding. A seal rubber 9 that seals the engine room 3 when the engine hood 6 is closed is fixed to the lower end of the engine hood 6.

As shown in FIG. 2, the valve unit 8 is
A plurality of intake holes 11 are provided in the mounting plate 10, and a unit is integrally formed with the valve 12 attached to the intake holes 11. The valve unit 8 includes a valve 12
Are arranged at the height of the axis of the cooling fan 4. The valve units 8 are mounted so that the distance between each valve 12 and the cooling fan 4 is different.

The mounting plate 10 is formed by bending a metal plate into a U-shape. The intake hole 11 has a circular cross section. The intake holes 11 are provided in a line. In addition,
The number of the intake holes 11 is a number that can secure the ventilation required for cooling the engine 5 at the time of the maximum rotation of the engine 5, and in the present embodiment, five intake holes 11 are provided. A valve 12 is attached to each of the intake holes 11.

The valve 12 is integrally formed of rubber. As shown in FIG. 3A, the valve 12 is formed so that its diameter decreases toward the distal end 12a in a normal state. The tip 12a is formed flat.
When the pressure outside the valve 12 decreases, the tip 1
2a is pushed outward from the inside of the valve 12, and FIG.
As shown in FIG. The thickness of the rubber of the valve 12 is formed such that all the valves 12 are opened at the time of the maximum rotation of the engine 5.

The base end 12b of the valve 12 is formed in a cylindrical shape. The base end 12b is provided with a locking groove 12c over the entire circumference of the valve 12. The groove width of the locking groove 12c is formed to be substantially the same as the thickness of the mounting plate 10.
The valve 12 is tightly fixed to the intake hole 11 by fitting the locking groove 12c into the intake hole 11 with the tip 12a on the engine room 3 side.

Next, the ventilation device 3 configured as described above
The operation of 0 will be described. When the engine 5 is stopped, the valves 12 of the valve unit 8 are all closed as shown in FIG.

When the engine 5 is operated, the cooling fan 4
Is also rotated at the same time. Due to the rotation of the cooling fan 4, the pressure in the engine room 3 near the upstream of the cooling fan 4 decreases. Then, in the valve 12 near the upstream of the cooling fan 4, the pressure outside the valve 12 decreases. Due to this pressure difference, the tip 12a is pushed outward from the inside of the bulb 12, and is deformed outward so as to expand.
As a result, as shown in FIG.
Of these, the valve 12 close to the cooling fan 4 is opened. Since the distal end 12a is formed flat, the valve 12 is more easily opened than when the distal end 12a is formed in a circular shape.

When the number of revolutions of the engine 5 further increases, as shown in FIG. 4C, the valves 12 which are next to the cooling fan 4 are sequentially opened. Then, when the engine speed is the highest, as shown in FIG.
All the valves 12 of the valve unit 8 are opened.

On the other hand, when the number of revolutions of the engine 5 decreases, the valve 12 which is far from the cooling fan 4 is sequentially closed by the elastic force of rubber, and returns to the state shown in FIG. As described above, the opening area of the valve 12 is automatically changed by the pressure difference between the inside of the valve 12 and the inside of the engine room 3. Therefore, the opening area of the valve 12 can be automatically changed in accordance with the rotation speed of the engine 5, and noise can be prevented from leaking outside the engine room 3. In particular, it is effective in preventing noise leakage at the time of low-speed rotation of the engine 5 during idling or the like.

Since the valve 12 is provided at substantially the height of the shaft of the cooling fan 4, the pressure in the engine room 3 near the valve 12 is easily reduced effectively, and the opening and closing of the valve 12 is facilitated. Done in In addition, since the height of the axis of the cooling fan 4 is higher than the ground or the floor, dust on the ground or the floor hardly flows into the engine room 3.

The plurality of valves 12 are arranged so that the distance from the cooling fan 4 is different. Therefore, the valves 12 are sequentially opened from the valve 12 close to the cooling fan 4. Therefore, the adjustment of the opening area of the valve 12 based on the pressure change in the engine room 3 becomes easy.

According to the above embodiment, the following effects are obtained. (B) By the pressure difference between the outside air and the engine room 3,
By providing the valve 12 whose opening area is automatically changed, the opening area of the valve 12 is increased when the engine 5 is rotating at a high speed, and the opening area of the valve 12 is increased when the engine 5 is rotating at a low speed. Can be narrow. Therefore, the opening area of the valve 12 can be automatically changed according to the rotation speed of the engine 5. Therefore, it is possible to reduce the leakage of noise to the outside of the engine room 3 while ensuring the ventilation required for cooling the engine 5 in the engine room 3. In particular, it is effective in preventing noise leakage at the time of low-speed rotation of the engine 5 during idling or the like.

(B) Since the plurality of valves 12 are arranged so as to have different distances from the cooling fan 4, the opening area of the valves 12 is adjusted based on a change in the pressure in the engine room 3. Becomes easier.

(C) Since the plurality of valves 12 are unitized in the valve unit 8, the valve 12 can be easily mounted in the engine room 3 as compared with the case where a control device for controlling the opening and closing of the intake port is provided. be able to.

(D) Since the valve 12 is provided at substantially the height of the axis of the cooling fan 4, the pressure in the engine room 3 near the valve 12 is easily reduced effectively, and the valve 12 is opened and closed. Is performed smoothly. Further, it becomes difficult for dust on the ground or floor to flow into the engine room 3.

(E) The valve 12 is integrally formed of rubber, so that the valve 12 can be easily manufactured. The embodiment is not limited to the above, and may be, for example, the following case. In the present embodiment, a pipe 13 may be attached outside the valve 12 as shown in FIG. In this case, the noise leaking from the engine room 3 to the outside is attenuated in the pipe 13 and the noise can be reduced. The same effect can be obtained by attaching a bent plate having a width substantially equal to the length of the valve unit 8 so as to cover the outside of each valve 12. The ventilation device 30 does not need to include the valve unit 8. For example, the intake hole 11 may be opened in the engine hood 6 or the frame 7 to attach the valve 12. In this case, it is easy to retrofit the conventional industrial vehicle. The position of the valve unit 8 may be any wall surface that constitutes the engine room 3, but is preferably provided at a position corresponding to the side of the forklift 1. In this case, the suction port 11 is not closed by the operator of the forklift 1 and the outside air is smoothly sucked. In addition, since it is arranged at a position far from the worker, the worker is less likely to be concerned about noise. Further, maintenance and inspection of the ventilation device 8 are facilitated. The position of the valve unit 8 may be any wall as long as it constitutes the engine room 3, and may be mounted at a position higher or lower than the height of the shaft of the cooling fan 4. The valve unit 8 may be any as long as it can secure ventilation required for cooling the engine 5 in the engine room 3.
The shape is appropriately changed according to the displacement of the engine 5 and the size of the engine room 3. The valve 12 may be of any type as long as its opening area can be automatically changed by the difference between the pressure in the engine room 3 and the outside air pressure, and its shape and material are not limited. The valve unit 8 only needs to have no gap between itself and the engine hood 6 when the engine hood 6 is closed. If the valve unit 8 and the engine hood 6 are in close contact with each other, the seal rubber 9 is not required. . ○ The change in the opening area of the valve 12
The opening area may be changed in two stages such that the opening is small when the engine is stopped, and large when the engine 5 is rotating at a high speed.

In the following, technical ideas other than the claims that can be grasped from the embodiment will be described together with their effects. (1) The ventilation device according to any one of claims 1 to 5, wherein the ventilation device is provided at a position corresponding to a side of the forklift. In this case, the intake port is not blocked by the forklift operator,
The outside air is smoothly sucked. In addition, since it is arranged at a position far from the worker, the worker is less likely to be concerned about noise. Further, maintenance and inspection of the ventilation device are facilitated.

(2) The ventilation device for an engine room according to any one of claims 1 to 5, wherein the valve increases an opening area when the pressure in the engine room becomes lower than the atmospheric pressure. In this case, the opening area of the valve can be changed continuously.

[0032]

As described in detail above, according to the first to fifth aspects of the present invention, the valve whose opening area is automatically changed by the pressure difference between the outside air and the engine room is provided. Thereby, the opening area of the valve can be automatically changed according to the engine speed. For this reason,
It is possible to reduce leakage of noise to the outside of the engine room while securing ventilation required for cooling the engine in the engine room. In particular, it is possible to reduce noise leakage during low-speed rotation of the engine.

According to the second aspect of the present invention, when the pressure inside the valve is higher than the pressure outside, the front end of the valve is deformed outward, and the opening area increases. Further, the valve is integrally formed of rubber, so that the valve can be easily manufactured.

According to the third aspect of the invention, since the valve is provided at substantially the height of the shaft of the cooling fan, the pressure in the engine room near the valve is easily reduced effectively. The opening and closing of the valve 12 is performed smoothly.

According to the fourth aspect of the present invention, since each of the plurality of valves is arranged so as to have a different distance from the cooling fan, the opening of the valve based on the pressure in the engine room is achieved. Adjustment of the area becomes easy.

According to the fifth aspect of the present invention, since the ventilation device is unitized, it can be easily installed in the engine room. According to the invention described in claim 6, it is possible to provide an industrial vehicle that can easily reduce noise at the time of low-speed rotation of the engine.

[Brief description of the drawings]

FIG. 1 is a side view of a forklift according to an embodiment.

FIG. 2 is a schematic sectional view of the ventilation device.

FIG. 3A is a perspective view of a valve in a closed state,
(B) is a perspective view of the valve similarly opened.

FIG. 4 is a schematic view showing the operation of the ventilation device.

FIG. 5 is a sectional view of a main part of a ventilation device according to another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Forklift as an industrial vehicle, 3 ... Engine room, 4 ... Cooling fan, 5 ... Engine, 8 ... Valve unit, 10 ... Mounting plate, 11 ... Intake hole, 12 ... Valve, 1
2a: Tip side, 30: Ventilation device

Claims (6)

[Claims] 1. An industrial vehicle in which an intake hole for communicating the engine room with the outside is provided on a wall surface constituting an engine room, the intake hole is provided in a plurality, and the intake hole is provided in the engine room. A ventilation valve formed so that the opening area can be automatically increased or decreased based on the pressure of the engine room. 2. The valve is formed integrally with rubber, and is formed such that when an inner pressure is larger than an outer pressure, a distal end side thereof is deformed outward to increase an opening area, and the distal end side is formed. The ventilation device for an engine room according to claim 1, wherein the ventilation device is attached to the intake hole so as to be on the engine room side. 3. The ventilation device for an engine room according to claim 1, wherein the valve is provided at a position corresponding to a height of a shaft of a cooling fan provided in the engine. 4. The ventilation device for an engine room according to claim 1, wherein each of the valves is provided so as to have a different distance from the cooling fan. 5. The ventilation device according to claim 1, further comprising a valve unit in which the intake hole is provided in a mounting plate, and the valve is attached to the intake hole, and the unit is integrally united. The ventilation device for an engine room according to any one of the above. 6. An industrial vehicle provided with the ventilation device for an engine room according to claim 1.