JP2001027130A - Noise reducing structure for sealed engine compartment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure an amount of supply of cooling wind by making air guide ports for engine cooling wind and radiator cooling wind independent with each other. SOLUTION: This structure is provided with a shield plate 40 around an engine 5 to form a sealed engine compartment 50, and air guide ports 41, 43 for engine cooling wind and radiator cooling wind are made independent with each other. The shield plate 40 is separately provided with the air guide port 43 for the engine cooling wind and a discharge port 45 to cool the engine 5 with outside air, and the air guide port 43 is formed so that the cooling wind collides with an object to be cooled in an approximately vertical direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a peripheral structure of a closed chamber type engine which is accommodated in a hood of a working machine such as a tractor, and more particularly to a cooling structure for an engine and a radiator, and a noise reduction of an engine sound. It relates to a structure aimed at reduction.

[0002]

2. Description of the Related Art Conventionally, there has been known a configuration in which a radiator is disposed at a front portion of an engine or the like and the radiator is cooled by a radiator cooling fan driven by an engine. The cooling air is guided to the engine side, and the engine is cooled using the cooling air. In addition, the engine is housed in a hood such as the front of the fuselage, and in such a configuration, the noise of the engine propagates to the cabin (driver's seat) located at the rear of the hood, thereby deteriorating the working environment of the operator. . Therefore, to reduce engine noise,
Measures were taken, such as providing a shield around the engine.

[0003]

However, in the above prior art, in order to guide the outside air after the radiator cooling to the engine side, the engine is cooled by cooling air whose temperature is raised by about 20 ° C. from the outside air. For this reason, there was a problem that engine cooling was not performed efficiently. Also,
The engine sound was reduced by providing a shield plate around the engine.However, shielding around the engine also impeded the heat radiation of the engine. Did not sufficiently reduce engine noise.

[0004]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. That is, in a closed engine room,
The configuration is such that the air guide ports for the engine cooling air and the radiator cooling air are independent.

Further, a closed type engine room is formed by providing a shielding plate around the engine, and a ventilation port and a discharge port for engine cooling air are separately provided in the shielding plate to cool the engine by outside air. .

Further, the air guide port is disposed at a position where the cooling air taken in from the air guide port collides with a cooling object in a substantially vertical direction.

Further, the air guide port is formed near the lower portion of the oil pan.

In addition, a wind guide is provided in the vicinity of the side surface of the oil pan, so that cooling air taken in from the wind guide port passes upward through the side of the oil pan and is guided to the engine side.

Further, a shielding plate is provided near the front and rear surfaces of the oil pan to block the flow of cooling air taken in from the air guide port in the front and rear direction of the oil pan.

[0010] The air guide opening is formed near an electrical component in the engine compartment.

Further, the air guide opening has an opening shape having a length of substantially half or more with respect to a longitudinal length of the object to be cooled.

In addition to the radiator cooling fan, an engine cooling fan is provided on the engine cooling air discharge port side,
The hot air after cooling the engine was sent to the outside air.

Further, a duct is provided for guiding the hot air sent by the engine cooling fan to the outside air side.

Further, the engine cooling fan is constituted by a sirocco fan, while the radiator cooling fan is constituted by an axial fan.

Further, the engine cooling fan is constituted by a sirocco fan capable of obtaining a high static pressure.

In addition, a double-suction sirocco fan is disposed between the engine and the radiator so that the engine cooling fan and the radiator cooling fan can be used.

Further, the radiator cooling fan is constituted by a discharge type axial flow fan, the air is sucked from the engine room by the negative pressure in the fan room, and the engine cooling fan and the radiator cooling fan are combined.

Further, an air guide duct is provided for connecting a shroud at a rear portion of the radiator to the engine room, and air is discharged from the engine room through the air guide duct by a negative pressure on a radiator side surface of a fan disposed between the radiator and the engine. And the fan is used as both an engine cooling fan and a radiator cooling fan.

Further, by providing a shield plate around the engine to form a closed engine room, the engine cooling fan is disposed on a shaft driven by the engine output, and the casing of the engine cooling fan is covered by the shield. Attached to the board.

Further, by providing a shield plate around the engine, a closed-type engine room is formed, and the radiator cooling fan and the engine cooling fan are arranged on the same shaft driven by the engine output, respectively. A fan casing was attached to the shield.

In addition, the air inlet for the engine cooling air is provided on the side of the cooling object having a higher priority, and the cooling air whose temperature has been raised cools a relatively high temperature portion of the cooling object.

Further, an engine cooling fan is provided downstream of the engine cooling air after cooling the exhaust muffler.

Further, a partition for dividing the engine body and the exhaust muffler is provided, and an engine cooling fan is provided at an opening of the partition.

Further, a partition for dividing the engine body and the exhaust muffler is provided, and an engine cooling fan is provided downstream of the engine cooling air after cooling the exhaust muffler.

Further, a partition wall for dividing the engine body and the exhaust muffler is provided, and an engine cooling fan is provided at a wind guide port for drawing cooling air into the engine compartment.

Further, the radiator cooling air after the radiator cooling is guided to the exhaust muffler side.

Further, a partition is provided to divide the engine body and the exhaust muffler to form an exhaust muffler chamber, and the radiator cooling air after cooling the radiator is guided to the exhaust muffler chamber.

Further, a sealed engine room is formed by providing a shielding plate around the engine, and an opening is provided in the shielding plate to guide the radiator cooling air to the engine room.

Further, a sealed engine room is formed by providing a shielding plate around the engine, and an opening is provided in the shielding plate to guide the radiator cooling air toward the oil pan.

Further, a closed-type engine room is formed by providing a shielding plate around the engine, and a wind guide duct for guiding the radiator cooling air toward the electrical components in the engine room is provided.

Further, the air guide port has a plurality of slit shapes.

Further, a filter is attached to the air guide port.

In addition, a shield plate support frame is fixed to the engine, and the shield plate is supported by the shield plate support frame via a vibration isolator.

Further, a hollow portion is provided around the engine room which is sealed by the shielding plate, and a space is provided between the engine room and the hollow portion.
A communication path is provided between the hollow portion and the outside.

[0035]

Next, an embodiment of the present invention will be described. FIG. 1 is a side view showing a tractor having a closed engine room of the present invention, FIG. 2 is a side view showing the inside of a hood at the front of the tractor, FIG. 3 is a side view showing the inside of a hood having an engine cooling fan and a radiator cooling fan. 4 is a front view, FIG. 5 is a plan view, FIG. 6 is a bottom view, FIG. 7 is a front view of the inside of a hood employing a sirocco fan as an engine cooling fan, and FIG. 8 is a double suction type radiator cooling fan. FIG. 9 is a side view of another embodiment in which a radiator cooling fan and an engine cooling fan are combined, and FIG. 10 is a side view of an embodiment in which a shroud portion and an engine room communicate with each other through a ventilation duct. FIG. 11A is a side view of the engine showing a driving method of the engine cooling fan, FIG. 11B is a front view of the same, and FIG. 13 is a side view of the engine in which the cooling fan is driven on the same axis, FIG. 13 is a side view of the inside of the hood of the embodiment in which the engine cooling fan is disposed above the exhaust muffler, and FIG. 14 divides the engine room and the exhaust muffler room. FIG. 15 is a side view of another embodiment, FIG. 16 is a side view of another embodiment, and FIG.
7 is a side view of the inside of the bonnet of the embodiment in which the engine cooling fan is disposed in the air introduction port at the lower part of the engine, FIG. 18 is a side view of another embodiment, FIG. 19 is a side view of another embodiment, FIG.
Is a side view of a hood configured to guide radiator cooling air to an exhaust muffler chamber, FIG. 21 is a side view of a hood configured to guide radiator cooling air into an engine room, and FIG. FIG. 23 (a) is a bottom view of the hood showing a configuration in which the air guide opening has a slit shape, and FIG.
(B) is a bottom view of the hood having a configuration in which a filter is attached to the air guide port, FIG. 24 is a front view of the hood showing a state in which a shielding plate is mounted via a vibration isolator, and FIG. 25 is an inflatable silencer around the engine. It is a front view showing the composition in which the structure was arranged.

First, the overall structure of a tractor having a closed engine room according to the present invention will be described with reference to FIG. A hood 4 is disposed at the front of the machine which suspends the front wheels 2 and 2 and the rear wheels 3.3 before and after, and an engine 5 is built in the hood 4. A steering handle 7 is provided behind the hood 4, and a seat 8 is provided behind the steering handle 7. An instrument panel 9 is provided in front of the steering handle 7. The steering handle 7, the seat 8, the instrument panel 9 and the like are covered by the cabin 10.

A transmission 6 is connected to the rear of the engine 5 to transmit power from the engine 5 to the rear wheels 3 for driving. The driving force of the engine 5 drives the PTO shaft projecting rearward from the rear end of the machine, and drives the work machine 11 connected to the work machine mounting device 12 at the rear end of the machine. As shown in FIG. 2, a radiator 13 is provided in front of the engine 5 installed in the hood 4 at the front of the tractor, and the radiator 13 is cooled by a cooling fan 14 which is driven to rotate by the engine 5. I have. The engine room 50 of the present invention described below constitutes a closed engine room covered with a shielding plate.

Next, the configuration of the closed engine room according to the present invention will be described with reference to FIGS. As shown in FIG. 3, the engine 5 has front and rear, left and right, top and bottom shielding plates 40.
A radiator cooling fan 14 that is rotationally driven by the engine 5 protrudes in front of the engine 5, and a radiator 13 is provided in front of the radiator cooling fan 14. It is arranged.
The rear side of the hood 4 is constituted by the shielding plate 40 and the like, and houses the engine 5, and the front side houses the radiator 13 and the like. At the front end side of the bonnet 4, a wind guide port 41 is formed as an air intake port.
After the air taken in from the air guide port 41 is sucked by the radiator cooling fan 14 and passes through the radiator 13 to remove heat from the cooling water in the radiator 13, the outlets provided on the left and right sides of the bonnet 4. The air is released from the grill 42 to the outside air.

On the other hand, as shown in FIGS. 3, 4 and 6,
The shield plate 40 below the engine 5 is provided with a wind guide port 43 for cooling the engine. Further, a discharge port 45 for the engine cooling air is provided in the shielding plate 40 in front of the engine 5,
An engine cooling fan 15 is provided in front of the discharge port 45. In such a configuration, the engine cooling fan 15 sucks the air in the closed engine room, whereby the engine cooling air is sequentially supplied from the lower air guide port 43 to the upper engine room. And
The cooling air whose temperature has increased after cooling the engine 5 is discharged by the engine cooling fan 15, passes through the duct 16, and is sent out to the outside air through the opening 46 shown in FIGS. 4 and 5. The duct 16 is, as shown in FIG.
The periphery of the engine cooling fan 15 is covered, and one of the left and right sides (the left side in this embodiment) extends to the side surface of the bonnet 4 and communicates with the outside air through the opening 46.

As described above, the hermetically sealed engine of the present invention has excellent sound insulation since the substantially front surface of the engine 5 is covered by the shielding plate 40, and the working environment of the operator located in the cabin 10 behind the hood 4 Could be improved. Also, noise reduction to the surroundings is possible. The radiator cooling air is supplied from a front air vent 41 in front of the hood 4, and the engine cooling air is supplied from a lower air vent 43 in the engine 5.
In other words, by making the airflow openings for the engine cooling air and the radiator cooling air independent, a sufficient supply of the cooling air is ensured, resulting in an excellent cooling structure. The cooling efficiency of the engine 5 is significantly improved as compared with the configuration in which the engine 5 is guided to the engine 5 side.

Further, the cooling air of the engine 5 is supplied to the air guide port 43.
Since it is configured to be discharged to the outside air from a discharge port 45 provided separately from the outside, the cooling air whose temperature has risen in the engine room does not stay and the circulation of the cooling air can be smoothly performed. Further, as shown in FIG. 4 and the like, the cooling air vent 43 of the engine cooling air is so arranged that the cooling air (outside air) flowing from the cooling air guiding 43 collides with the lower surface of the engine 5 to be cooled in a substantially vertical direction. Since it is formed, the outside air can be efficiently blown to the object to be cooled, and the cooling efficiency has increased. Further, as shown in FIG.
An oil pan 5a is provided at the bottom. That is,
In the engine 5 to be cooled, the cooling of the engine 5 is performed efficiently by providing the air guide port 43 below the oil pan 5a having a high cooling priority.

As shown in FIG. 3 and FIG. 4, the air guides 17
17 are provided. As shown in FIG. 3, the air guides 17 are erected on the shielding plate 40 over substantially the entire length of the engine 5 as shown in FIG. 3, and as shown in FIG. It is arranged so as to form a letter shape, and is configured such that the air guide port 43 is located at the lower center thereof. With such a configuration, the left and right sides of the engine 5 are guided upward without escaping the cooling air (outside air) supplied from the wind guide port 43 in the left-right direction. Further, as shown in FIGS. 3 and 4, regulating plates 18 are provided at a lower front portion and a rear portion of the engine 5. The regulating plates 18 are erected on the lower shielding plate 40 and extend to the vicinity of the front and rear surfaces of the engine 5, respectively, so that the cooling air guided upward by the air guides 17 is moved in the front and rear direction. It prevents escape and enables efficient engine cooling.

As shown in FIGS. 3 and 5, an electric component 51 is mounted on the side of the engine 5 and the like. In order to cool the electrical component 51, the present invention is provided with a wind guide port 44 for cooling the electrical component. As described above, the air guide port 44 is also formed so that the inflowing outside air blows substantially perpendicularly to the electrical component 51 to be cooled, so that an efficient cooling effect can be obtained.

As shown in FIG. 6, the air guide port 43 provided at the lower part of the engine 5 is substantially rectangular in this embodiment, and has a length 43L in the longitudinal direction of the rectangle.
Is about half or more of the front-rear length 5L, which is the longitudinal direction of the engine 5. In other words, the configuration is such that the cooling air is blown over as large an area as possible to the object to be cooled by forming the air guide port 43 having an opening shape having a length substantially equal to or more than half the length in the longitudinal direction of the object to be cooled. In addition, a sufficient cooling effect is obtained.

In the present invention, as described above, the engine cooling fan 15 is provided at the discharge port 45 of the engine cooling air separately from the radiator cooling fan 14, so that
The sufficient cooling effect is ensured by the two fans, and the warm air after engine cooling discharged from the discharge port 45 is guided by the duct 16 and sent out of the opening 46, so that the engine is cooled. The circulation of cooling air became smooth and the cooling effect was improved.

In the embodiment shown in FIG. 7, while the radiator cooling fan 14 is constituted by an axial fan, a sirocco fan is employed as the engine cooling fan 15. As a result, it is easy to avoid the engine cooling air and the radiator cooling air from opposing each other, and even in a narrow space, the respective cooling air can be smoothly circulated and sent. And the engine cooling fan 1
By employing a sirocco fan capable of discharging a high static pressure, the air intake ports such as the air guide ports 43 and 44 can be configured with an opening area as small as possible, and the sound insulation of the engine 5 is sufficiently maintained. While enabling engine cooling.

Next, another embodiment of the noise reduction structure in the closed engine room will be described. In the embodiment shown in FIG. 8, the radiator cooling fan 14 is a double-suction sirocco fan, and the radiator cooling fan 14 and the engine cooling fan 15 are also used. The shield plate 40 in front of the engine 5 is provided with a fan suction port 47, and the cooling air flowing from the air guide ports 43 and 44 to cool the engine 5 is supplied to the radiator cooling fan 1
After the air is sucked by the outlet 4, the air is sent to the outside air from the outlet grill 42, and the radiator cooling air after the radiator is cooled is also sent to the outside air by the outlet grill 42. Also in this configuration, as described above, since the cooling air vents for the engine cooling air and the radiator cooling air are provided separately, a sufficient amount of cooling air is ensured, and the low-cost configuration is realized by using the fan as the fan. I have.

In the embodiment shown in FIG. 9, the radiator cooling fan 14 is configured as a discharge type axial fan and also used as the engine cooling fan 15. In this configuration, the air flow from the radiator cooling fan 14 causes the cooling air in the closed engine room 50 to be sucked from the fan inlet 47 and discharged to the front of the hood together with the radiator cooling air. Also in this configuration, as described above, since the cooling air vents for the engine cooling air and the radiator cooling air are provided separately, a sufficient amount of cooling air is ensured, and the low-cost configuration is realized by using the fan as the fan. I have.

In the embodiment shown in FIG. 10, a wind guide duct 23 is provided in a shroud 19 mounted on the rear part of the radiator 13. The air guide duct 23 extends rearward in the hood 4, penetrates through the shielding plate 40, and communicates with the engine room 50. In this configuration, the radiator cooling fan 14 is used as a suction type axial flow fan (a discharge method may be used) to blow radiator cooling air,
The engine cooling air in the engine room is sucked in, and a sufficient cooling effect can be maintained by the configuration that also serves as the engine cooling fan and the radiator cooling fan.

Next, a method of driving the engine cooling fan 15 will be described with reference to FIGS. FIG.
As shown in the side view of FIG. 11A and the front view of FIG.
A camshaft 20, a cooling water pump shaft 21, and a crankshaft 22 project from the engine 5.
The radiator cooling fan 14 is fixedly mounted on the radiator.
In this embodiment, the engine cooling fan 15
Is fixedly mounted on the camshaft 20. With such a configuration, a new mechanism for driving the engine cooling fan 15 is not required, and the cooling structure of the present invention is realized with a simple configuration. Further, the engine cooling fan 15 may be mounted on a rotating shaft protruding from the other engine 5, for example, a cooling water pump shaft 21, a crankshaft 22, or the like. FIG. 12 shows a configuration in which the engine cooling fan 21 is mounted on a cooling water pump shaft 21. In this configuration, since both the engine cooling fan 15 and the radiator cooling fan 14 are mounted on the cooling water pump shaft 21, the configuration is such that the two fans are driven concentrically, and a compact configuration can be achieved. Become. In the embodiment shown in FIGS. 11 and 12,
The casing of the engine cooling fan 15 is mounted on the shielding plate 40. That is, by adopting a configuration similar to that of the duct 16 shown in the embodiment of FIGS.
This prevents the counterflow between the engine cooling fan 15 and the radiator cooling fan 14 and enables smooth circulation of the cooling air.

Next, a description will be given of a noise reduction structure taking into account the priority of engine cooling. In the embodiment shown in FIG. 13, as described above, the cooling air flowing from the wind guide port 43 first cools the oil pan 5a and then rises to cool the engine body. Then, the cooling air that has been heated to become hot air cools the exhaust muffler 52 located above the engine 5. In other words, the cooling air whose temperature has risen and the cooling effect has been reduced is used for cooling the exhaust muffler 52 which is a relatively high temperature portion, so that the cooling air is effectively used. After the engine cooling air has cooled the exhaust muffler 52, the engine cooling fan 1 is located downstream (in this embodiment, above the exhaust muffler 52).
5 is arranged. With this configuration, the circulation of the cooling air for sequentially cooling the oil pan 5a, the engine 5, and the exhaust muffler 52 becomes smooth, and the cooling effect is increased.

In the embodiment shown in FIG. 14, a partition wall 25 is provided in a closed engine room, and an engine 5 and an exhaust muffler 52 are housed in an engine room 50 and an exhaust muffler room 53, respectively. Then, the opening 2 is formed in the partition 25.
5a, and the engine cooling fan 1 is provided in the opening 25a.
By arranging the exhaust muffler 5, the cooling air in the engine room is sucked in and the exhaust muffler 52 is cooled. With such a configuration, the exhaust muffler 5
2 to prevent the heat radiation from transmitting to the engine 5 side,
The engine cooling effect has been improved.

In the embodiment shown in FIG. 15, the engine chamber 50 and the exhaust muffler chamber 53 are similarly divided by the partition wall 25, and an opening is provided on the rear side of the exhaust muffler chamber 53 to cool the engine. A fan 15 is provided. The engine cooling fan 15 guides the cooling air in the engine room 50 into the exhaust muffler chamber 53, cools the exhaust muffler 52, and sends it to the outside air. That is, since the partition wall 25 is provided, and the engine cooling fan 15 is provided downstream of the engine cooling air after cooling the exhaust muffler 52,
The engine 5 is protected from the heat radiation of the exhaust muffler 52, and the cooling effect is increased by the smooth circulation of the cooling air. FIG. 16 shows another embodiment,
An opening is provided on the front side of the exhaust muffler chamber 53, and the engine cooling fan 15 is provided.

In the embodiment shown in FIGS. 17, 18 and 19, the engine room 50 and the exhaust muffler room 53 are divided by the partition wall 25, and the engine cooling fan 15 are arranged. Also in this configuration, the engine 5 is protected from the heat radiation of the exhaust muffler 52 by the partition wall 25, and the engine 5 and the exhaust muffler 52 are sufficiently cooled. In particular, the engine cooling fan 15 urges the oil pan 5a to the oil pan 5a. Since the cooling air is blown toward the oil pan 5a, a high cooling effect for the oil pan 5a can be obtained. Also, as shown in FIG. 17, by arranging the engine cooling fan 15 downstream of the cooling air in the exhaust muffler chamber 53, the circulation of the engine cooling air is further smoothed to obtain a high cooling effect. . Also,
In the embodiment shown in FIG. 19, no opening is provided in the partition wall 25, and the cooling air is sent to the outside air by the duct 16 provided in the front part of the engine room.

Next, an embodiment in which the radiator cooling air is effectively used will be described. As shown in FIG. 20, the engine 5 and the exhaust muffler 52 are divided by the partition wall 25 to form an engine room 50 and an exhaust muffler room 53. The shielding plate 40 on the front side of the exhaust muffler chamber 53 includes:
An opening 54 is provided and communicates with the radiator side in the hood. In this configuration, the cooling air sucked by the suction-type radiator cooling fan 14 is heated to become hot air after cooling the radiator, and the hot air cools the exhaust muffler 52 which is a relatively high temperature portion. It is composed. As a result, the radiator cooling air can be effectively used, and the cooling efficiency has been improved. The opening 5
From the 4 into the exhaust muffler room, along with cooling air, dust,
Although dust and the like are mixed in, the partition wall 25 prevents them from entering the engine room.

In the embodiment shown in FIG. 21, an opening 55 is provided in the shielding plate 40 on the front side of the engine 5 so as to guide the radiator cooling air into the engine room 50. According to this configuration, the hermeticity of the engine 5 is high, the engine noise is reduced, and the heat balance of the engine 5 can be improved by effectively using the radiator cooling air. In the embodiment shown in FIG. 22, the opening 56 is formed in the shielding plate 40 at the lower front side of the engine 5.
, The radiator cooling air is blown into the engine compartment 5
The oil pan 5a is guided to the oil pan 5a. Also in this configuration, the hermeticity of the engine 5 is high,
Also, the oil pan 5a is effectively used by effectively using the radiator cooling air.
Can be sufficiently cooled. As shown in the figure, a guide plate 57 is provided at the lower rear of the shroud 19 at the rear of the radiator 13.
Are configured to guide the cooling air passing through the radiator 13 to the opening 56. Further, one end of a wind guide duct 58 is provided at a rear position of the radiator cooling fan 14, and the wind guide duct 58 extends rearward, penetrates through the shielding plate 40, and further extends rearward. One end is opened near the electrical component 51 provided on the side of the engine 5. As a result, the radiator cooling air can be effectively used as cooling air for the electrical components 51, and a cooling structure for engine peripheral parts can be secured at low cost.

Next, the configuration of the air guide port 43 will be described. In the embodiment shown in FIG.
3 comprises a plurality of slit-shaped openings. With such a configuration, the air guide port 43 serving as an air intake port is provided.
Therefore, it is possible to prevent dust, dirt and the like from entering, and to maintain a clean state in the engine room.
Thereby, the durability of the engine 5 is improved, and the frequency of maintenance can be reduced. FIG. 23 (b)
In the embodiment shown in (1), the air guide port 43 is covered with the mesh sheet material 60. This configuration also prevents dust, dirt, and the like from entering the engine room 50 from the outside air. Further, instead of the mesh sheet material, filtering may be performed by using a metal plate having a plurality of punched holes to form ventilation holes. In other words, the configuration is such that the wind guide port 43 is covered with a filter such as a mesh sheet material 60 or a metal plate having punched holes.

Next, the support structure of the shielding plate 40 will be described. As described above, the surroundings of the engine 5 are covered with the plurality of shielding plates 40 forming a part of the hood 4, thereby forming a closed engine room 50. As shown in FIG. 24, a shield plate support frame 26 is attached to the engine 5, and vibration isolating devices 27 are mounted on the upper portion of the shield plate support frame 26. The configuration is such that the shielding plate 40 is supported via the vibration isolator 27. With such a configuration, it is possible to prevent the vibration sound of the engine 5 from being transmitted to the shielding plate 40 and to bring noise to the outside, and to have a configuration excellent in sound insulation.

Finally, another embodiment relating to the sound insulation structure of the engine 5 will be described. As shown in FIG. 25, the engine 5 is hermetically sealed by the first
0, a second shielding plate 29 is further provided on the outer periphery of the first shielding plate 28, and a silencing chamber 59 is provided between the outside and the engine room 50. And
A communication passage 30 is provided between the engine room 50 and the muffler room 59.
.. is provided, and a communication passage 31 is provided between the sound deadening chamber 59 and the outside.
. 31 are provided. In such a configuration, before the noise of the engine 5 is released to the outside through the communication passages 30 and 31, the noise is suppressed by the sound deadening chamber 59 which is a hollow portion provided between the engine room 50 and the outside. To reduce external noise. That is,
The hollow silencer 59 constitutes an inflatable silencer. Also, using the communication passages 30 and 31,
By taking in the engine cooling air, an engine room 50 having low noise and a cooling structure is configured.

[0060]

The closed engine compartment of the present invention is constructed as described above and has the following effects.
That is, in the closed-type engine room, the configuration is such that the respective air introduction ports of the engine cooling air and the radiator cooling air are made independent, so that the supply amount of the cooling air is sufficiently secured and the cooling effect is increased.

Further, a sealed engine room is formed by providing a shielding plate around the engine, and a ventilation port and a discharge port for the engine cooling air are separately provided in the shielding plate to cool the engine by outside air. As a result, the cooling air whose temperature has risen in the engine room does not stay, and the cooling air can be smoothly circulated.

Further, since the air guide port is arranged at a position where the cooling air taken in from the air guide port collides with the cooling object in a substantially vertical direction, the cooling object can be efficiently cooled.

Further, since the air guide port is formed near the lower portion of the oil pan, the oil pan having a high cooling priority can be preferentially cooled even in the engine to be cooled.

Further, a wind guide is provided in the vicinity of the side surface of the oil pan, so that the cooling air taken in from the wind guide port passes upward through the side of the oil pan and is guided to the engine side. When the cooling air (outside air) supplied from the air guiding port is directed to the lateral direction, for example, when the air guiding guide is provided near the left and right side surfaces of the oil pan, the cooling air does not escape in the horizontal direction.
Cooling air can be used efficiently.

Further, since a shielding plate is provided near the front and rear surfaces of the oil pan to block the flow of cooling air taken in from the air guide port in the front and rear direction of the oil pan, the cooling air is guided upward by the air guide. The engine can be cooled efficiently without the induced cooling wind escaping in the front-back direction.

Further, since the air guide opening is formed near the electrical components in the engine compartment, it is possible to supply the cooling air in a substantially vertical direction to the electrical components generating a large amount of heat, thereby increasing the cooling effect.

Further, since the air guide opening has an opening shape having a length substantially equal to or more than half of the longitudinal length of the object to be cooled, the cooling air is blown to the object to be cooled with as large an area as possible. And a sufficient cooling effect can be obtained.

In addition to the radiator cooling fan, an engine cooling fan is provided on the engine cooling air discharge port side.
Since the hot air after cooling the engine is sent to the outside air, each cooling air can be circulated smoothly, and the cooling air whose temperature has risen does not stay in the engine room, etc.
The cooling effect has been improved.

Further, since the duct for guiding the hot air sent by the engine cooling fan to the outside air is provided,
The engine cooling air can be circulated smoothly, and the cooling air whose temperature has risen can be efficiently sent to the outside air.

Further, since the engine cooling fan is constituted by a sirocco fan and the radiator cooling fan is constituted by an axial fan, it is easy to avoid opposition between the engine cooling air and the radiator cooling air. In addition, each cooling air can be smoothly circulated and sent out.

Further, since the engine cooling fan is constituted by a sirocco fan capable of obtaining a high static pressure, it is possible to configure the air intake port with an opening area as small as possible. Was made possible.

Further, since a double-suction sirocco fan is disposed between the engine and the radiator, and the engine cooling fan and the radiator cooling fan are combined, sufficient cooling air can be supplied by independent air guide ports. However, it has become possible to perform engine cooling and radiator cooling at low cost.

Further, the radiator cooling fan is constituted by a discharge type axial flow fan, the air is sucked from the engine room by the negative pressure in the fan room, and the engine cooling fan and the radiator cooling fan are combined. The engine cooling and radiator cooling can be performed at low cost while allowing sufficient cooling air to be supplied by independent air guide ports.

Further, a ventilation duct is provided for connecting the shroud at the rear of the radiator to the engine compartment, and the air is discharged from the engine compartment through the ventilation duct by the negative pressure on the side of the radiator of the fan disposed between the radiator and the engine. So that the cooling fan can be used as both an engine cooling fan and a radiator cooling fan, so that sufficient cooling air can be supplied by independent air guide ports, while performing engine cooling and radiator cooling at low cost. It became possible.

Further, by providing a shield plate around the engine, a sealed engine room is formed, the engine cooling fan is disposed on a shaft driven by the engine output, and the casing of the engine cooling fan is covered by the shield. Since it is mounted on the plate, a new mechanism for driving the engine cooling fan is not required, and the cooling structure of the present invention can be realized with a simple configuration.

Further, by providing a shield plate around the engine, a closed engine room is formed. The radiator cooling fan and the engine cooling fan are arranged on the same shaft driven by the engine output, respectively. Since the casing of the fan is mounted on the shielding plate, the two fans are driven by concentric shafts, resulting in a compact configuration.

Further, the air inlet for the engine cooling air is provided on the side of the cooling object having a higher priority, and the cooling air whose temperature has risen is configured to cool a relatively high temperature portion of the cooling object. The cooling air whose ascending and cooling effect has been reduced can be used effectively.

Further, since the engine cooling fan is provided downstream of the engine cooling air after cooling the exhaust muffler, the circulation of the engine cooling air is smooth and the cooling effect is improved.

Further, a partition for dividing the engine body and the exhaust muffler is provided, and an engine cooling fan is provided in the opening of the partition, so that the heat radiation from the exhaust muffler is prevented from being transmitted to the engine. The engine cooling effect has been improved.

Further, a partition wall for dividing the engine body and the exhaust muffler is provided, and an engine cooling fan is provided downstream of the engine cooling air after cooling the exhaust muffler, so that the engine is protected from heat radiation of the exhaust muffler. In addition, the cooling effect was improved by the smooth circulation of cooling air.

Further, a partition wall for dividing the engine body and the exhaust muffler is provided, and an engine cooling fan is provided at a wind guide port for drawing cooling air into the engine compartment.
While protecting the engine from the heat radiation of the exhaust muffler,
Although the engine and the exhaust muffler are sufficiently cooled, in particular, since the engine cooling fan blows the cooling air toward the oil pan vigorously, a high cooling effect for the oil pan is obtained.

Further, since the radiator cooling air after the radiator cooling is configured to be guided to the exhaust muffler side, the radiator cooling air can be effectively used, thereby improving the cooling efficiency.

Further, since the exhaust muffler chamber is formed by providing a partition for dividing the engine body and the exhaust muffler, and the radiator cooling air after the radiator cooling is guided to the exhaust muffler chamber, the radiator cooling air is effectively used. This improves cooling efficiency, and also allows dust and dirt to enter the exhaust muffler room along with the cooling air from the opening. Improved.

Further, a sealed engine room is formed by providing a shield plate around the engine, and an opening is provided in the shield plate to guide the radiator cooling air to the engine room. In addition to reducing engine noise, the heat balance of the engine was improved by effectively utilizing the radiator cooling air.

Further, a sealed engine room is formed by providing a shield plate around the engine, and an opening is provided in the shield plate to guide the radiator cooling air toward the oil pan. In addition, the oil pan can be sufficiently cooled by effectively using the radiator cooling air.

Further, since a sealed engine room is formed by providing a shielding plate around the engine and a wind guide duct for guiding the radiator cooling air to the electrical components side in the engine room is provided, the radiator cooling air is supplied to the electrical components. It can be effectively used as cooling air for the engine, and it has become possible to secure a cooling structure for parts around the engine at low cost.

Further, since the air inlet is formed in a plurality of slit shapes, dust and dirt are prevented from entering the engine room from the air inlet, which is an air intake, and the engine room is kept clean. Can now be maintained.

Further, since the filter is attached to the air guide port, dust and dirt are prevented from entering the engine room from the air inlet port, which is also an air intake port, and the engine room is cleaned. State can be maintained.

Further, since the shield plate support frame is fixed to the engine and the shield plate is supported by the shield plate support frame via the vibration isolator, the vibration noise of the engine is transmitted to the shield plate. Thus, it is possible to prevent noise from being introduced to the outside, and the configuration is excellent in sound insulation.

Further, a hollow portion is provided around the engine room which is hermetically sealed by the shielding plate, and a space between the engine room and the hollow portion is provided.
Further, since the communication passage is provided between the hollow portion and the outside, the noise of the engine is silenced by the hollow portion, so that the noise to the outside can be reduced. In addition, by using the communication passage and taking in the engine cooling air, it is possible to configure an engine room having low noise and a cooling structure.

[Brief description of the drawings]

FIG. 1 is a side view showing a tractor having a closed engine room according to the present invention.

FIG. 2 is a side view showing the inside of the hood at the front of the tractor.

FIG. 3 is a side view inside a hood having an engine cooling fan and a radiator cooling fan.

FIG. 4 is a front view of the same.

FIG. 5 is a plan view of the same.

FIG. 6 is a bottom view of the same.

FIG. 7 is a front view of the inside of a bonnet employing a sirocco fan as an engine cooling fan.

FIG. 8 is a side view of the inside of the hood in which the radiator cooling fan is constituted by a double suction type sirocco fan.

FIG. 9 is a side view of another embodiment in which a radiator cooling fan and an engine cooling fan are also used.

FIG. 10 is a side view of the embodiment in which the shroud portion and the engine room are communicated with each other by a wind guide duct.

11A is a side view of an engine showing a driving method of an engine cooling fan, and FIG. 11B is a front view of the same.

FIG. 12 is an engine side view of a configuration in which an engine cooling fan and a radiator cooling fan are driven on the same axis.

FIG. 13 is a side view of the inside of the hood of the embodiment in which the engine cooling fan is disposed above the exhaust muffler.

FIG. 14 is a side view of the inside of a hood having a configuration in which an engine room and an exhaust muffler room are divided.

FIG. 15 is a side view of another embodiment.

FIG. 16 is a side view of another embodiment.

FIG. 17 is a side view of the inside of the hood of the embodiment in which the engine cooling fan is provided in the air guide port below the engine.

FIG. 18 is a side view of another embodiment.

FIG. 19 is a side view of another embodiment.

FIG. 20 is a side view of the inside of the hood configured to guide the radiator cooling air to the exhaust muffler chamber.

FIG. 21 is a side view of the inside of the hood configured to guide the radiator cooling air into the engine compartment.

FIG. 22 is a side view of the inside of the hood configured to guide the radiator cooling air to the oil pan.

23A is a bottom view of a hood showing a configuration in which a wind guide port has a slit shape, and FIG. 23B is a bottom view of a hood having a filter attached to the wind guide port.

FIG. 24 is a front view of the hood showing a state where a shielding plate is mounted via a vibration isolator.

FIG. 25 is a front view showing a configuration in which an inflatable silencer structure is arranged around an engine.

[Explanation of symbols]

 Reference Signs List 4 bonnet 5 engine 13 radiator 14 radiator cooling fan 15 engine cooling fan 40 shielding plate 43 air guide port 50 engine room 51 electrical components 52 exhaust muffler 53 exhaust muffler room

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Minoru Okubo, Inventor Minoru 1-332 Chaya-cho, Kita-ku, Osaka, Japan Inside Yanmar Diesel Co., Ltd. (72) Inventor Hiroshi Uehara 1-32 Chaya-cho, Kita-ku, Osaka, Osaka Yanmar Diesel Co., Ltd.

Claims (31)

[Claims] 1. A noise reduction structure for an enclosed engine room, wherein the airflow openings for the engine cooling air and the radiator cooling air are made independent in the enclosed engine room. 2. A closed-type engine room is provided by providing a shield plate around the engine, and a separate air introduction port and a discharge port for engine cooling air are provided on the shield plate to cool the engine by outside air. 2. The structure for reducing noise in a closed engine room according to claim 1. 3. The airtight engine room according to claim 2, wherein the air inlet is disposed at a position where cooling air taken in from the air inlet collides with a cooling object in a substantially vertical direction. Noise reduction structure. 4. The structure for reducing noise in a closed engine room according to claim 3, wherein the air guide port is formed near a lower portion of the oil pan. 5. A structure in which a wind guide is provided near a side surface of the oil pan, and cooling air taken in from the wind guide port passes upward through a side portion of the oil pan and is guided to an engine side portion. The structure for reducing noise in a sealed engine room according to claim 4, characterized in that: 6. A cooling plate provided in the vicinity of front and rear surfaces of the oil pan to block a flow of cooling air taken in from the air guide port in a front and rear direction of the oil pan. A low-noise structure for a closed-type engine room according to claim 5. 7. The structure for reducing noise in a closed-type engine room according to claim 3, wherein the air guide port is formed near an electric component in the engine room. 8. The low noise of the closed-type engine room according to claim 3, wherein the air guide port has an opening shape having a length substantially equal to or more than half of a longitudinal length of the cooling object. Structure. 9. The hermetically sealed enclosure according to claim 1, wherein an engine cooling fan is provided on a discharge port side of the engine cooling air separately from the radiator cooling fan, and the hot air after engine cooling is sent to the outside air. -Type engine room with low noise structure. 10. The structure of claim 9, wherein a duct is provided to guide the hot air sent out by the engine cooling fan to the outside air. 11. The structure of claim 9, wherein said engine cooling fan is constituted by a sirocco fan and said radiator cooling fan is constituted by an axial fan. 12. The structure of claim 9, wherein said engine cooling fan comprises a sirocco fan capable of obtaining a high static pressure. 13. A closed-type engine room according to claim 1, wherein a double-suction sirocco fan is disposed between said engine and said radiator so that said engine cooling fan and said radiator cooling fan are combined. Low noise structure. 14. A radiator cooling fan comprising a discharge type axial flow fan, wherein the radiator cooling fan is configured to suck air from an engine room by a negative pressure in a fan room in which the radiator cooling fan is disposed. 2. The structure for reducing noise in a sealed engine room according to claim 1, wherein the structure also serves as a fan. 15. A wind guide duct for connecting a shroud at a rear portion of the radiator and the engine room, and air is supplied from the engine room through the wind guide duct by a negative pressure on a radiator side surface of a fan disposed between the radiator and the engine. 2. The noise reduction structure of a closed engine room according to claim 1, wherein the fan is configured to draw in air, and the fan is used as both an engine cooling fan and a radiator cooling fan. 16. A closed engine room is provided by providing a shielding plate around an engine, and the engine cooling fan is disposed on a shaft driven by an engine output.
The noise reduction structure for a closed engine room according to claim 9, wherein a casing of the engine cooling fan is attached to the shielding plate. 17. A closed-type engine room is provided by providing a shielding plate around an engine, and the radiator cooling fan and the engine cooling fan are arranged on the same shaft driven by an engine output, respectively. 10. The structure for reducing noise in a sealed engine room according to claim 9, wherein a casing of the fan is attached to the shielding plate. 18. The cooling air guide port of the engine cooling air is provided on a cooling object side having a higher priority, and the cooling air whose temperature has increased cools a relatively high temperature portion of the cooling object. The noise reduction structure of a closed-type engine room according to claim 1. 19. The structure for reducing noise in a sealed engine room according to claim 18, wherein an engine cooling fan is provided downstream of the engine cooling air after cooling the exhaust muffler. 20. The noise reduction of a closed-type engine room according to claim 18, wherein a partition for dividing the engine body and the exhaust muffler is provided, and an engine cooling fan is provided in an opening of the partition. Construction. 21. The system according to claim 18, wherein a partition wall for dividing an engine body and an exhaust muffler is provided, and an engine cooling fan is provided downstream of the engine cooling air after cooling the exhaust muffler. Low noise structure of closed engine room. 22. The hermetically sealed engine according to claim 18, wherein a partition wall for dividing an engine body and an exhaust muffler is provided, and an engine cooling fan is provided at a wind guide port for drawing cooling air into the engine compartment. Low noise structure of the room. 23. The structure of claim 18, wherein the radiator cooling air after the radiator cooling is guided toward the exhaust muffler. 24. An exhaust muffler chamber is formed by providing a partition for dividing an engine body and an exhaust muffler, and radiator cooling air after radiator cooling is guided to the exhaust muffler chamber. The noise reduction structure of the enclosed engine room described in the above. 25. A hermetically sealed engine chamber comprising a shield plate provided around an engine to form a hermetically sealed engine room, an opening in the shield plate to guide radiator cooling air to the engine room. -Type engine room with low noise structure. 26. A closed-type engine room is provided by providing a shield plate around the engine, and an opening is provided in the shield plate to guide radiator cooling air toward the oil pan. Low noise structure of closed engine room. 27. A hermetically sealed engine, wherein a hermetically sealed engine room is formed by providing a shielding plate around the engine, and a baffle duct is provided to guide radiator cooling air toward electrical components in the engine room. Low noise structure of the room. 28. The structure for reducing noise in a closed engine room according to claim 1, wherein said air guide port is constituted by a plurality of slits. 29. The structure for reducing noise in a closed engine room according to claim 1, wherein a filter is attached to the air guide port. 30. The sealed mold according to claim 2, wherein a shield plate support frame is fixed to the engine, and the shield plate is supported by the shield plate support frame via a vibration isolator. Low noise structure in engine room. 31. A hollow portion is provided around an engine room sealed by a shielding plate, and communication paths are provided between the engine room and the hollow portion and between the hollow portion and the outside. 3. The structure for reducing noise in a closed engine room according to claim 2.