WO2001004474A1

WO2001004474A1 - Closed type engine chamber structure

Info

Publication number: WO2001004474A1
Application number: PCT/JP2000/004686
Authority: WO
Inventors: Masahiro Saitou; Toshiyuki Uyama; Minoru Ohkubo; Hiroshi Uehara
Original assignee: Yanmar Diesel Engine Co., Ltd.
Priority date: 1999-07-13
Filing date: 2000-07-12
Publication date: 2001-01-18
Also published as: JP4224172B2; JP2001027130A

Abstract

A closed type engine chamber structure, wherein a radiator (13) and a radiator cooling fan (14) are disposed on the outside of a closed type engine chamber (50) formed by closing an engine (5), an air inlet port (43 or 44) introducing cooling air into the engine chamber (50) and an air outlet port (45) exhausting cooling air from the engine chamber (50) are provided in the engine chamber (50), and the cooling air introduced into the engine chamber (50) through the air inlet port (43) is made independent of the cooling air supplied after cooling the radiator (13) by the radiator cooling fan (14) by disposing an engine cooling fan (15) facing the air outlet port (45).

Description

Description Closed engine room structure

Technical field

The present invention relates to a cooling air guide structure in and around an enclosed engine room configured to reduce engine noise, such as being housed in a hood of a work vehicle such as a tractor. Background art

Conventionally, in the hood of a work vehicle such as a tractor, a radiator is arranged in front of the engine, etc., and the cooling air after cooling the radiator by a radiator cooling fan driven by the engine is generated. It is known to provide a structure that guides the engine to cool the engine. The temperature of the cooling air after overnight cooling in Laje was about 20 ° C higher than outside air, and the cooling efficiency of the engine was not very good.

Also, in the hood of a working vehicle such as a tractor, etc., the noise of the engine is not directly transmitted to the adjacent cab, or is leaked to the outside via the hood, and then In order to reduce the transmission to the air as much as possible, measures have been taken to provide a shield around the engine and make the inside of the shield plate a semi-enclosed engine room. The shielding plate impedes the heat radiation of the engine, so it is not possible to perform sufficient shielding.As a result, the noise of the engine is transmitted to the bonnet outside the engine room and further out of the bonnet. The engine leaked and engine noise was not sufficiently reduced. In particular, as described above, when the Laje night cooling air is guided to the engine for engine cooling, a cooling air guide passage is formed between the engine and the Laje night, so the noise in the engine room is It was easy to leak through this guideway to the side of the bonnet where Laje was located. Disclosure of the invention A radiator and a radiator cooling fan are disposed outside a sealed engine room that hermetically seals an engine. The engine room has a ventilation opening for introducing cooling air into the engine room, and the engine room. In a configuration in which an exhaust port for discharging more cooling air is provided, the present invention provides a cooling apparatus in which the cooling air introduced into the engine room through the air guiding port is blown by the cooling fan for the cooling air. It is independent from the cooling air after cooling. As a result, a sufficient amount of cooling air, which has not risen in temperature after cooling the radiator but is low enough to cool the engine room, is supplied to the sealed engine room to ensure sound insulation. The cooling effect in the engine room is improved.

The air introduction port is disposed, for example, in the vicinity of the lower part of the oil pan and in the vicinity of the electrical component, so that the cooling air taken into the engine room from the air introduction port can be used to cool the oil in the engine room. ,. In this case, the cooling target such as a large amount of heat and a large amount of heat collides with a cooling target such as an electrical component in a substantially vertical direction so that the cooling target can be efficiently cooled.

In particular, for cooling near the oil pan, a ventilation guide is provided near the side surface of the oil pan, and the cooling wind taken in from the ventilation hole formed in the vicinity of the oil hole and the bottom is not escaping to the left and right outside. In addition, it is configured to rise along the side of the wheel and be guided to the side of the engine. In addition, a regulating plate is provided near the front and rear surfaces of the oil pan so as to block the flow of cooling air taken in from the air guide port formed near the bottom of the oil pan in the front and rear direction of the oil non-flow. . After the cooling air introduced into the engine room from the air vent formed near the lower part of Oervan in this way hits an oil pan that needs particularly cooling, the Oerno and Oen are cooled, and then the engine is cooled. The engine can be efficiently cooled by being guided smoothly to the side.

In order to allow the cooling air to be blown on the cooling object with as large an area as possible, the air guide opening is provided with an opening having a length of substantially half or more with respect to the longitudinal length of the cooling object. As a shape.

Further, the air guide port may be configured by forming a plurality of slits in parallel, or by covering the air guide port with a filter member so that dust, dust and the like can be removed from the air guide port. The engine compartment is kept in a clean state, which contributes to improving engine durability.

In configuring the closed-type engine chamber, a closed plate provided so as to surround the engine may be provided, and the air guide port and the exhaust port may be formed in the closed plate. In this way, it is possible to easily configure a closed-type engine room which has high sound insulation and is capable of being independently supplied with cooling air by being isolated from the cooling air after the cooling of the Rajje overnight.

In addition, in the configuration of the hermetic engine room with such a shielding plate, as described later, when an engine cooling fan for generating a flow of cooling air in the engine room from the air introduction port to the exhaust port is provided, By attaching the casing of the engine cooling fan to the shielding plate, the engine cooling fan can be arranged with a small number of parts in a compact manner. In addition, a shielding plate supporting frame is fixed to the engine in the engine room, and the shielding plate supporting frame is supported on the shielding plate via a vibration isolator, so that engine vibration can be applied to the shielding plate. Propagation can be reduced, and generation of noise caused by the vibration can be suppressed. Further, by providing a hollow silencing chamber outside the shielding plate and forming communication passages between the engine chamber and the silencing chamber and between the silencing chamber and the outside, respectively. The noise that leaks from the engine room can be once silenced sufficiently in the muffler room and then released to the outside, resulting in a sealed engine room with high sound insulation.

In the engine room, there is a relatively high temperature part such as an exhaust muffler.In order to prevent the engine body from being heated by such heat radiation from the high temperature part and the cooling effect of the engine body from being reduced, the engine muffler is required. The engine room may be separated by a partition into a main engine room that houses the main body of the engine and a high-temperature room that houses a cooling object such as an exhaust muffler that is relatively hot in the engine room. In this case, the air guide port and the exhaust port are formed so as to face the engine main chamber. In this case, apart from the cooling air supplied to the space accommodating the engine body, as a means for cooling the object to be cooled in the high-temperature room, the air blower is blown by the radiator cooling fan. It is conceivable that the wind after cooling is introduced into the high-temperature room. In other words, to cool a relatively high-temperature object to be cooled, such as an exhaust muffler in a high-temperature room, it is possible to use the air blown by the large-sized cooling fan without using a dedicated cooling fan. Increase can be suppressed. When the air after cooling the radiator is introduced into the high-temperature room, dust and dirt may enter the high-temperature room together with the cooling air. Intrusion can be prevented.

Note that a relatively high-temperature cooling target such as an exhaust muffler in the engine room may be cooled by the cooling air passing through the engine room from the above-described air guide port to the exhaust port. In this case, the cooling air taken into the engine room from the air inlet first hits a high-priority cooling object in the engine room, such as an oil pan or an electrical component, and then the temperature rises. The air guide port and the exhaust port are arranged so that the cooling air that cools a relatively high-temperature cooling target such as an exhaust muffler and is discharged from the exhaust port. That is, it is possible to effectively use the cooling air, which has been cooled and has a reduced cooling effect after cooling a high-priority cooling target, for cooling a relatively high-temperature cooling target such as the exhaust muffler. You can.

Even in such a cooling structure, the engine room is separated by a partition so as to protect the engine body from heat radiation from a relatively high temperature portion such as an exhaust muffler. It can be divided into a high-temperature room for storing a relatively high-temperature cooling object. In this case, the two spaces communicate with each other through an opening formed in the partition wall, the air guide opening faces the space for accommodating the main body of the engine, and the exhaust opening is connected to the high temperature As described above, the cooling air introduced into the engine main room from the air inlet cools the engine body, then enters the high-temperature room through the opening, and exhausts air. By cooling a relatively high-temperature cooling target such as a muffler, the flow of cooling air discharged from the exhaust port can be secured.

In order to generate a flow of cooling air from the air guide port of the engine room to the exhaust port, firstly, it is conceivable to provide an engine cooling fan separately from the cooling fan. In this regard, an engine cooling fan is provided in or near the exhaust port to generate cooling air in the engine room by its suction action. It is conceivable that an engine cooling fan is provided and a cooling air in the engine room is generated by the blowing action. In the former case, the cooling air can be guided so as to flow smoothly through the engine room from the air introduction port to the exhaust port, and the temperature of the engine room can be prevented from rising due to the accumulation of the high-temperature cooling air. In the latter case, the cooling air blown from the engine cooling fan can be strongly applied to the first cooling target, and a large cooling effect on the cooling target can be expected. Further, as described above, a partition is provided in the engine chamber to divide the engine into a main chamber and a high-temperature chamber, and when the partition is provided with an opening communicating with both spaces, the partition may be provided in the opening. It is also conceivable to arrange an engine cooling fan in the vicinity. In this case, the engine cooling fan can generate the cooling air by the suction operation in the engine main room and the blowing operation in the high temperature room.

When an engine cooling fan as described above is used as an axial fan that draws air from one side in the direction of the rotating shaft and blows air toward the other, it is necessary to secure suction spaces on both sides in the direction of the rotating shaft. It is necessary to secure a certain amount of wind blow-through area along the rotation axis direction, but by using a sirocco fan, a suction space is secured on one side in the rotation axis direction, and the blow-out space is In other words, it is sufficient to ensure the direction perpendicular to the rotation axis. Furthermore, since high static pressure can be generated, the opening area for suction can be reduced, and the duct packaging And so on. In particular, when a sirocco fan as an engine cooling fan is provided in or near the exhaust port, the rotation axis of the sirocco fan should be substantially aligned with the center of the exhaust port, and the cooling air in the engine room in the direction of the rotation axis. When the duct for exhaust air is extended from the exhaust port, the duct is placed on the opposite side of the direction of the rotation axis of the fan. There is no need to secure the air blowing space by expanding the sirocco fan, and it can be extended in the radial direction of the sirocco fan, so that a compact duct can be formed along the shielding plate.

The engine cooling fan is arranged on a shaft driven by the engine output, for example, a camshaft or a crankshaft, so that there is no need to add a dedicated rotation shaft for driving the fan, and it is compact and cost-effective. Can be reduced.

Further, by arranging the radiator cooling fan on the same shaft where the engine cooling fan is provided, a simple and compact configuration can be realized.

As described above, in the configuration in which the engine cooling fan is used to generate the cooling air in the engine room, a duct is extended from the exhaust port, and the air after the engine room is cooled flows from the exhaust port through the duct. By discharging the air to the outside air, It can be discharged smoothly to the outside air without stagnation facing other winds, such as the wind after the Laje overnight cooling. In particular, when an engine cooling fan is provided in or near the exhaust port, the engine cooling fan should smoothly send the air after engine cooling from the engine room to the duct without stagnation. You can do it. Another means for generating the cooling air in the engine room from the air guide port to the exhaust port is to use a Laje night cooling fan. In this case, there is no need to provide a separate engine cooling fan, so that costs can be reduced.

First, if the radiator cooling fan is a sirocco fan, the suction port on one side faces the radiator and the suction port on the other side faces the exhaust port of the engine room. Also, the air after cooling in the engine room discharged from the exhaust port will be sucked in by one fan, and the air guide port for cooling the radiator will be provided separately from the air guide port of the engine room. In addition, it is possible to supply sufficient cooling air from the independent air vents at the radiator and the radiator, but with a fan, it is possible to secure a low-cost and compact structure.

Further, the Laje night cooling fan is an axial fan, the suction side of which is directed to the exhaust port of the engine chamber, and the outlet side is directed to the Laje night, and the cooling fan is disposed between the exhaust port and the radial fan. It is possible to arrange in. In this case, due to the blowing action of the cooling air from the cooling fan, the space on the suction side of the engine room facing the air outlet becomes negative pressure, and the air in the engine room is sucked from the air outlet. As a result, a flow of cooling air in the engine room from the air guide port to the exhaust port is generated, and the wind sucked from the exhaust port is combined with the cooling air at Laje and sent to Laje at night. You. While sufficient cooling air can be supplied to the engine room and the radiator from independent ventilation holes, only one fan is required, and a low-cost and compact configuration can be secured.

Alternatively, in a configuration in which a shroud is continuously provided in Laje night, the duct is extended from the exhaust port of the engine room to the shroud with the intake side of the cooling fan facing the shroud. It is also conceivable that the air after cooling in the engine room may be exhausted from the exhaust port by the suction action of the cooling fan of the Laje night. Can be In this case as well, the air outlet for cooling the radiator is provided separately from the air inlet of the engine room, and it is possible to supply sufficient cooling air to the engine room and the radiator from the independent air inlet respectively. Only one fan is required, and a low-cost and compact configuration can be secured.

In the above description, the cooling air supplied to the engine room is made independent of the air after cooling the Rajje.However, due to heat balance, it may be better to cool the engine with the air after the Lajje cooling. is there. In response to such a situation, the present invention relates to a configuration in which a closed plate is provided around an engine to form a closed engine room, and a Rajesh night is provided outside the engine room. An opening is provided in the shielding plate, and the air after cooling the Lager night is introduced into the engine chamber from the opening, so that the engine is sealed and the engine is sealed. While noise can be suppressed, the radiator can be used effectively to improve the engine's shihito balance through effective use of the cooled air.

In addition, by arranging the opening so that cooling air introduced into the engine room through the opening is guided to the oil pan of the engine disposed in the engine room, The oil pan can be cooled efficiently by effective use of the wind after cooling in the evening.

Alternatively, a duct is provided extending through the shielding plate and extending into the engine room, and the air after cooling the Laje overnight through the duct is connected to an electric device attached to the engine in the engine room. By directing the air to the components, the wind after cooling the radiator can be used effectively to cool the electrical components in the engine room, and effective cooling of the engine peripheral components can be ensured at low cost.

The above and other objects, features and effects of the present invention will become apparent from the following description based on the accompanying drawings. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a side view of a tractor having a closed engine room according to the present invention. Fig. 2 is a side view of the inside of the hood at the front of the tractor.

FIG. 3 is a side view of the inside of the hood provided with the closed engine room according to the present invention. FIG. 3 is a diagram in a case where an engine cooling fan and a Lager overnight cooling fan are provided.

FIG. 4 is a plan view of the same.

FIG. 5 is also a bottom view.

FIG. 6 is also a front view.

FIG. 7 is a front view in place of FIG. 6 when a sirocco fan is used as the engine cooling fan.

FIG. 8 is a side view of the inside of the bonnet in which the closed-type engine room according to the present invention is disposed, showing an embodiment in which a cooling fan for the Rage night is also used for cooling the engine room. This is a diagram when the sirocco fan is used as the cooling fan and also serves to cool the engine room.

FIG. 9 is a side view of the inside of the hood in which the closed-type engine room according to the present invention is disposed, and is a diagram showing another embodiment in which a cooling fan for the Rajje is also used to cool the engine room. .

FIG. 10 is a side view of the inside of the bonnet in which the closed-type engine room according to the present invention is disposed, showing another embodiment in which a radiator cooling fan is also used for cooling the engine room. This is a diagram when a duct is provided between the shroud of the evening and the exhaust port of the engine room.

FIG. 11 (a) is an engine side view showing the driving structure of the engine cooling fan.

FIG. 11 (b) is also a front view.

FIG. 12 is a side view of the engine having a structure in which the engine cooling fan and the Lager overnight cooling fan are driven on the same axis.

FIG. 13 is a side view of the inside of the hood in which the closed-type engine room according to the present invention is disposed, and is a diagram showing an embodiment in which an engine cooling fan is disposed above an exhaust muffler.

FIG. 14 is a side view of the inside of the bonnet in which the closed-type engine room according to the present invention is disposed, wherein the engine room has a space for accommodating the engine body and a high-temperature space for accommodating the exhaust muffler. FIG. 3 is a diagram showing an example of partitioning into cells. FIG. 15 is a side view of the inside of the hood showing another embodiment.

FIG. 16 is a side view of the inside of the hood showing another embodiment.

FIG. 17 is a side view of the inside of the hood in which the closed-type engine room according to the present invention is provided, and is a diagram showing an embodiment in which an engine cooling fan is provided in a ventilation port below the engine. .

FIG. 18 is a side view of the inside of the hood showing another embodiment.

FIG. 19 is a side view of the inside of the hood showing another embodiment.

FIG. 20 is a side view of the inside of the hood, which is another embodiment of the present invention and shows a case where a configuration in which the cooling air of the Lager is introduced into the high-temperature space is adopted.

FIG. 21 is a side view of the inside of the hood in which the sealed engine room according to the present invention is disposed, and is a diagram showing an embodiment in which the wind after cooling the Laje overnight is guided into the engine room. .

FIG. 22 is a side view of the inside of the hood, which is another embodiment of the present invention, and shows a case where a configuration in which air after cooling over Lager is guided to the oil pan section is employed.

FIG. 23 (a) is a bottom view of a bonnet provided with a sealed engine room according to the present invention and having a slit-shaped air guide port.

FIG. 23 (b) is a bottom view of the bonnet in which the closed-type engine room according to the present invention is provided, and the wind guide port is covered with a filter.

FIG. 24 is a front view of the engine room showing a state in which the engine is supported on the closing plate constituting the closed engine room via the vibration isolating device.

FIG. 25 is a front view of the engine room, showing a configuration in which an inflatable silencing structure is arranged around the engine room. BEST MODE FOR CARRYING OUT THE INVENTION

The closed engine room structure of the present invention is applied to, for example, a tractor bonnet as shown in FIGS. The outline of this tractor will be described. The bonnet 4 is disposed at the front of the machine which suspends the front left and right wheels 2 and the rear left and right wheels 3 in the front and rear directions. The hood 4 has an engine 5 built in. A cabin (operating cabin) 10 is provided behind the bonnet 4, and inside the cabin 10, An instrument panel 9 is provided adjacent to the rear end of the bonnet 4, and a handpiece 8 is provided behind the panel, and a sheet 8 is provided behind the panel.

Below the cabin 10, a transmission 6 for transmitting the power of the engine 5 to the rear wheel 3 is provided. In addition, the power of the engine 5 is transmitted to a PTO shaft protruding rearward from the rear end of the machine body, and drives the work machine 11 connected to the work machine lifting device 12 provided at the rear end of the machine body.

As shown in FIG. 2, a radiator 13 is disposed in the bonnet 4 in front of the engine 5, and the radiator 13 is cooled by a cooling fan 14 that is driven to rotate by the engine 5.

The structure of the closed-type engine room 50 according to the present invention applicable to the hood of the tractor shown in FIGS. 1 and 2 will be described with reference to FIGS. 3 to 25. . In these drawings, the bold arrows indicate the flow of the engine cooling air, and the bold broken arrows indicate the flow of the Laje night cooling air.

The embodiment shown in FIGS. 3 to 6 will be described. In the rear half of the bonnet 4, front and rear, right and left, and up and down shielding plates 40 are arranged to form a substantially sealed engine room 50. 5 are arranged. In the front half of the bonnet 4, that is, in front of the engine room 50 (in front of the front end shielding plate 40), the engine 5 passes through the shielding plate 40 in front of the engine room 50 and forward. Laje that protrudes into the evening—The evening cooling fan 14 is arranged, and in front of it, the Laje evening 13 is arranged.

At the front end of the bonnet 4, an air intake 41 as an air intake is formed, and the outside air is sucked from the air intake 41 by the cooling fan 14 over the rage and introduced into the bonnet 4, and After passing through the evening 13 and taking heat from the cooling water in the evening 13 in Laje, it is discharged outside through the side grills 42 provided on the left and right sides of the bonnet 4.

On the other hand, as shown in FIG. 3, FIG. 5 and FIG. 6, a shielding plate 40 (at the bottom of the engine room 50) disposed below the engine 5 has a ventilation port 4 3 for cooling the engine. The shutter 40 (in front of the engine compartment 50), which is located in front of the engine 5, has an exhaust port 45 for the engine cooling air. 15 is disposed immediately before the exhaust port 45 through the exhaust port 45. the 4th As shown in Fig. 5 and Fig. 5, an opening 46 is provided on one side of the bonnet 4 immediately before the engine room 50, and a shielding plate 40 in front of the engine room 50 in the bonnet 4 is provided. An exhaust duct 16 containing an engine cooling fan 15 is provided between the exhaust port 45 and the opening 46 along the line.

Due to the suction force (sucking action) of the engine cooling fan 15, cooling air is introduced into the engine room 50 from below the bonnet 4 through the air introduction port 43,

The cooling air whose temperature has risen after cooling is further cooled through the exhaust port 4

It is discharged from 50 and discharged outside through the exhaust duct 16 and the opening 46. In the above-described configuration, the engine room 50 is sealed substantially over the entire surface, that is, the engine 5 is almost completely covered by the closing plate 40 in the front-rear, left-right, and up-down directions, so that the sound insulation is excellent. In particular, there is no need to form a cooling air guide passage between the Lager night 13 and the engine 5 separately from the engine cooling air and the Laje night cooling air, and the exhaust air outlets 45 are also exhaust air ducts. The engine room in the bonnet, covered with 16

The front 50 is almost completely partitioned by a shielding plate 40 and an exhaust duct 16 in front of the engine room 50. If a bearing is interposed between the shielding plate 40 on the front of the engine room 50 and the rotating shaft of the radiator cooling fan 14 penetrating therethrough, the shielding performance is further improved.

Thus, the engine noise leaking from the engine room 50 is small, and the noise that leaks out of the bonnet 4 and propagates indirectly into the cabin 10 adjacent to the back of the bonnet 4 is also directly. The transmitted noise is also reduced, making the working environment in the cabin 10 comfortable.

Also, instead of using cooling air that has increased in temperature after overnight cooling in Rage as the cooling air for the engine 5, for example, outside air is directly introduced from the air inlet 43, and an engine cooling fan 15 is provided. As a result, the cooling air introduced into the engine room 50 is discharged smoothly from the exhaust port 45, so that the cooling air whose temperature has risen in the engine room 50 flows smoothly without stagnation. Further, the air inlet 43 is located below the engine 5, and the cooling air (outside air) flowing upward from the air inlet 43 into the engine room 50 collides with the bottom surface of the engine 5 substantially vertically. That is, outside air is efficiently blown to the engine 5 to be cooled. The bottom of the engine 5 has an engine The oil pan 5a having the highest cooling priority among the oil pans is arranged. As described above, despite the fact that the engine room 50 is hermetically sealed almost all around the engine 5, it enables extremely efficient engine cooling.

In addition, as shown in FIG. 5, the air guide port 43 has a rectangular shape which is long in the front-back direction in this embodiment, and the length in the longitudinal direction (ie, the front-back direction) is the same as the longitudinal direction of the engine 5 (ie, the front-back direction). In order to secure an effective cooling area as wide as possible in the direction, the length is approximately half or more of the front and rear length of the engine 5. Regardless of the shape, the point is that it is sufficient to secure the air guide port 43 as long as possible in the longitudinal direction of the engine 5.

In addition, as shown in FIGS. 3 and 6, in the engine room 50, a wind guide 17 is provided on each of the left and right sides of the wind guide port 43. As shown in FIG. 3, the pair of left and right air guides 17 are provided upright on the shielding plate 40 at the lower end of the engine room 50 over substantially the entire length of the engine 5 in the front-rear direction, as shown in FIG. The mutually facing surfaces of the left and right air guides 17 are parallel substantially vertical planes, which are respectively arranged on the lower left and right sides of the lower portion of the engine 5 and are bent below the lower end of the engine 5. However, a tapered slope is formed toward the wind guide port 43. Therefore, the cooling air introduced into the engine room 50 from the air guide port 43 is guided upward without escaping to the left and right between the left and right air guides 17, and the bottom of the engine 5 (oil pan 5 a), and flows upward while licking the left and right sides of the engine 5 while passing between the upper guide surface of the left and right wind guides 17 and the left and right sides of the engine 5.

Further, as shown in FIGS. 3 and 6, a pair of front and rear regulating plates 18 are erected on a shielding plate 40 on the bottom surface of the engine room 50. It is arranged immediately before and after the lower end of the engine 5 so that the cooling air guided upward from the air inlet 43 to the space between the left and right air guides 17 does not escape back and forth.

With such a pair of left and right air guides 17 and a pair of front and rear regulating plates 18, the outside air introduced into the engine room 50 from the air guide holes 43 can be effectively and almost efficiently used on the bottom and side surfaces of the engine 5. And a high engine cooling effect can be obtained.

These air guides 17 and regulating plates 18 are not shown in each embodiment of the engine room 50 in FIG. 8 and thereafter, but similarly, in each of the subsequent embodiments, May be adopted.

Further, as shown in FIGS. 3 and 4, an electrical component 51 is mounted on a side surface of the engine 5 and the like. In order to cool the electrical components 51, separate from the draft holes 43, a ventilation port 44 is formed on the shielding plate 40 as one side of the engine room 50 so as to face the electrical components 51. The cooling air flowing into the engine compartment 50 from the air inlet 44 blows the electrical components 51 almost vertically, so that the electrical components 51 with high cooling priority can be effectively cooled. . The wind for cooling the electrical components is also introduced into the engine room 50 from the air guide 44 by the suction action of the engine cooling fan 15. Further, it is also possible to secure a sufficient opening area for the cooling wind of the electric component as the air introduction port 44 longer than half the length of the electric component 51 in the longitudinal direction.

As shown in FIG. 6, a substantially U-shaped air discharge duct 16 having a vertical width so as to cover the entire upper and lower portions of the engine cooling fan 15 is formed in a front view, and the embodiment shown in FIG. The engine cooling fan 15 is a sirocco fan so that high static pressure air can be exhausted in a small space, and the suction side faces the exhaust port 45 to blow air radially. Correspondingly, the exhaust duct 16 as a diffuser is extended in the radial direction of the sirocco fan, and the expansion to the Laje night cooling fan 14 is suppressed. The inlet is about the upper and lower half of the engine cooling fan 15 (the lower half in this embodiment), and has a small internal cross-sectional area and a compact configuration. The sirocco fan generates a high static pressure and has a high suction force, and it is expected that the effect of reducing the opening area of the air inlets 43, 44 will increase the sound insulation of the engine room 50. it can.

Thereafter, for example, as shown in FIGS. 13, 14, 15, 16, 18, etc., the discharge at a position different from the position shown in FIGS. 3 to 6 is performed. The air vent 45, or the engine cooling fan 15 disposed in the air guide 43 and the opening 25a as described later, may be an axial fan or a sirocco fan. In addition, the exhaust port 45 formed at a position different from the position shown in FIGS. 3 to 6, for example, as shown in FIGS. In order to discharge wind to the outside, a duct corresponding to the exhaust duct 16 may be extended.

Next, without installing the engine cooling fan 15 An embodiment in which the internal cooling of the engine chamber 50 is also used will be described with reference to FIGS. 8 to 10. FIG.

In the embodiment shown in FIG. 8, the radiator cooling fan 14 is used as a sirocco fan, and the radiator cooling fan 14 is disposed between the radiator cooler 13 and the exhaust port 45 formed in the shielding plate 40 in front of the engine room 50. And the air inlets on both sides are directed to the Laje night 13 and the air outlet 45, respectively. In addition, a fan suction duct 47 is interposed from the exhaust port 45 to the suction port of the Lager overnight cooling fan 14 on the exhaust port 45 side.

The sirocco fan, the Laje night cooling fan 14, sucks the wind after the Laje night cooling from the air inlet 41 from the front, and flows into the engine room 50 from the air outlet 43, 44. After cooling the engine 5, the cooling air is sucked from the rear air inlet 45 through the fan suction duct 47. The sucked cooling air from the front and the rear is merged, radially blown out in the radial direction, and discharged from the side grille 42 to the outside.

In the embodiment shown in FIG. 9, the Lager night cooling fan 14 disposed between the Lager night 13 and the exhaust port 45 formed in the closing plate 40 in front of the engine room 50 is It is an axial fan that generates wind from the rear to the front. With regard to cooling at Laje night, the outside air introduced from the side grille 42 is blown by the Laje night cooling fan 14 as cooling air toward the Laje night 13 in front of the outside grille, and the air inlet at the front of the bonnet 4 4 Release to outside air through 1. In addition, this ventilation creates a negative pressure in the space behind the cooling fan 14 in Laje, and shuts off the engine cooling air in the engine room 50 (from the air guide ports 43, 44). The air is sucked from the air outlet 45 formed in the plate 40 and discharged to the air inlet 41 in front of the bonnet while being used as cooling air for the rage. As in the previous embodiment shown in FIG. 8, separate cooling air passages and cooling air passages are formed for cooling the engine and cooling the engine. This reduces the number of parts, installation space, and cost.

In the embodiment shown in FIG. 10, the engine cooling fan 14 which is an axial fan is used as described above, and the shroud 19 is provided at the rear end of the shroud 19 which is provided at the rear of the Rage 13. The suction side of the cooling fan 14 faces the engine room 50 in front A duct 23 is interposed between the exhaust port 45 formed in the surface shielding plate 40 and the shroud 19. The Laje night cooling fan 14 blows the Laje night cooling air from the air introduction port 41 to the wind guide grill 42, and the suction action causes the inside of the shroud 19 to have a negative pressure. The air is sucked in, the engine cooling air is discharged from the air inlets 4 3, 4 4 and 4 through the engine room 50 and discharged to the duct 23 from the exhaust outlets 45, and the engine cooling air is also The air is exhausted from the side grille 42 to the outside air together with the cooling air.

In each of the embodiments shown in FIGS. 8 to 10 described above, separate air introduction ports and cooling air flow paths are formed for the Laje night cooling and the engine cooling, and the respective cooling effects are secured. Both fans are generated by a single fan, which reduces the number of parts, installation space, and cost.

Next, as shown in FIGS. 3 to 7, the driving method of the engine cooling fan in the case of using the engine cooling fan 15 separate from the Laje night cooling fan 14 is shown in FIGS. This will be described with reference to FIG.

As shown in Figs. 11 (a) and (b), a camshaft 20, a cooling water pump shaft 21 and a crankshaft 22 are protruded in front of the engine 5, and are provided via belt pulleys. The rotational power of the crankshaft # 22 is transmitted to the camshaft 20 and the cooling water pump shaft 21. In this embodiment, the camshaft 20 and the cooling water pump The shaft 21 extends in front of a shielding plate 40 (not shown in FIG. 11) on the front of the engine room 50. The engine cooling fan 15 is fixedly mounted on the extension 14 of the camshaft 20.

In addition, the engine cooling fan 15 may be attached to another rotating shaft protruding from the engine 5, for example, a cooling water pump shaft 21, a crankshaft 22, or the like. In Fig. 12, the engine cooling fan 15 is mounted on the cooling water pump shaft 21 together with the Laje night cooling fan 14, so that the two fans are driven by concentric shafts. Contribute to

In this way, the rotary drive shaft of the engine cooling fan 15 does not need to be provided with another new shaft, but can be extended and used as various rotary shafts for the engine. Therefore, the cooling structure of the present invention is realized with a simple and low-cost configuration.

In the embodiment shown in FIGS. 11 and 12, the casings of the engine cooling fan 15, the closing plate 40 constituting the engine room 50, and the like are omitted. By constructing the exhaust port 45, the opening 46, and the exhaust duct 16 in the same manner as the embodiment shown in FIGS. 3 to 5, the engine cooling fan 15 and the Laje The air flow can be smoothly circulated by avoiding the opposition of both air flow due to (14).

Also, as shown below, the engine cooling fan 15 disposed at a position different from that shown in FIGS. 3 to 6 also has a rotating shaft protruding from the engine 5 or a belt or Power may be transmitted by a bevel gear or the like, and driven by the power of the engine 5.

Next, in each of the embodiments shown in FIGS. 13 to 16, an exhaust muffler 52 disposed above the engine 5 and provided as a relatively high-temperature portion in the engine room 50 is also introduced. In order to establish an engine cooling air passage that cools with the engine cooling air from the air vents 43, the layout of the engine cooling fan 15 ゃ exhaust vents, etc. has been devised.

That is, in each of the embodiments, as described above, the cooling air flowing from the air introduction ports 43 and 44 is first supplied to the oil pan 5 a 下部 below the engine 5, which is a high-priority cooling target in the engine room. After cooling the electrical components 51, it rises to cool the engine body, and thus the cooling air, which has been heated and becomes hot air, is further raised to cool the exhaust muffler -52. . In other words, the cooling air whose temperature has risen due to engine cooling and whose cooling effect has been reduced is used for cooling the exhaust muffler 52 which is a relatively high temperature part in the engine room 50, so that the cooling air can be effectively used. Is being planned.

In order to guide the engine cooling air from the air introduction port 43 to the exhaust muffler 52, in FIG. 13, the exhaust port 45 is provided in the shielding plate 40 on the upper surface of the engine room 50 above the exhaust muffler 52. A cooling fan 15 is provided to face the exhaust port 45. In this manner, the cooling air introduced into the engine chamber 50 from the air guide port 43 by the suction force of the engine cooling fan 15 flows through the oil pan 5a, the engine 5 main body, and the exhaust muffler 52. The air passes smoothly in order, and is exhausted from the exhaust port 45 to above the engine room 50. In the embodiment shown in FIG. 14, an engine room 50 surrounded by a shielding plate 40 is divided by a partition wall 25 disposed between the engine 5 and an exhaust muffler 152 above the engine room 50. The engine main room 5 O a that houses the main body of the engine 5 and the exhaust muffler room (high-temperature room) 53 that houses the exhaust muffler 52 above it are divided into two sections. It is prevented from propagating to the engine 5 and the cooling effect of the engine is improved. In addition, a part of the shielding plate 40 (in the present embodiment, the shielding plate 40 on the rear surface of the engine room 50) is opened to form an exhaust port 45 for communicating the exhaust muffler chamber 53 with the outside. ing. The engine cooling fan 15 is disposed in (or near) the opening 25a of the partition wall 25. The cooling air introduced into the main engine room 50a of the engine room 50 from the air introduction ports 43 and 44 by the suction force of the engine cooling fan 15 passes through the engine 5 and cools it, thereby cooling the engine. The air is sucked by the cooling fan 15, rises, is blown out into the exhaust muffler chamber 53 through the opening 25 a, cools the exhaust muffler 52, and is discharged to the outside through the exhaust port 45.

In each of the embodiments shown in FIGS. 15 and 16, the engine room 50 surrounded by the shielding plate 40 is housed by the partition wall 25 having the opening 25 a, and the engine 5 main body is housed therein. The engine cooling fan 15, which is divided into the engine main chamber 50 a and the exhaust muffler chamber (high-temperature chamber) 53, is disposed downstream of the cooling air with respect to the exhaust muffler 52, The cooling air of the exhaust muffler 152 is generated by suction of the engine cooling fan 15. In FIG. 15, a shielding plate 40 is opened at the rear of the exhaust muffler 52 to form an exhaust port 45 for communicating the exhaust muffler chamber 53 with the outside. The engine cooling fan 15 is arranged inside. In FIG. 16, an exhaust opening 45 is formed by opening a shielding plate 40 in front of the exhaust muffler 52, and an opening 46 is formed at the upper end of the bonnet 4 immediately before the opening. As a result, an exhaust duct 16 for communicating the exhaust muffler chamber 53 with the outside is formed between the exhaust port 45 and the opening 46, and the engine is provided in the exhaust port 45. Cooling fan 15 is provided. Thus, in each of the embodiments shown in FIGS. 15 and 16, as in the embodiment shown in FIG. 14, protection of the engine 50 against heat radiation from the exhaust muffler 52 by the partition wall 25, and conduction This has the effect of securing the engine cooling air path that passes through the engine 5 and the exhaust muffler 52 sequentially from the wind port 43 and is discharged to the outside through the exhaust port 45. You.

In the embodiment shown in FIGS. 17 to 20, in the same manner as described above, the engine chamber 50 is partitioned into an engine main chamber 50a and an exhaust muffler chamber 53 by a partition wall 25, and the exhaust gas is exhausted. While protecting the engine 5 from the heat radiation of the muffler 52, the engine cooling fan 15 is provided in the air guide port 43 below the engine 5, and especially the oil pan 5a is connected to the engine cooling fan 15 Since the wind blown out from the air pan vigorously hits the structure, a high cooling effect for the oil pan 5a can be obtained.

In the embodiment shown in FIG. 17, similarly to FIG. 15, the exhaust muffler 52 opens the shielding plate 40 behind the exhaust muffler 52, and the air exhaust port 45 connects the exhaust muffler chamber 53 to the outside. In the embodiment shown in Fig. 18, as in Fig. 16, the closing plate 40 in front of the engine room 50 in front of the exhaust muffler 52 is opened to open the exhaust port. 45, and an opening 46 is formed at the upper end of the bonnet 4 immediately in front of it, and an exhaust duct 16 for communicating the exhaust muffler chamber 53 with the outside is formed. It is formed between the exhaust port 45 and the opening 46. Further, in the embodiment shown in FIG. 17, similarly to FIG. 15, the engine cooling fan 15 is provided in (or near) the exhaust port 45. As described above, since the engine cooling fan 15 is disposed downstream of the exhaust muffler 152, the circulation of cooling air from the air introduction ports 43 and 44 to the exhaust port 45 is further smoothed and high. A cooling effect is obtained. Such an engine cooling fan 15 may be provided in or near the exhaust port 45 in FIG.

In each of the embodiments shown in FIGS. 19 and 20, the partition wall 25 is not provided with the opening 25a, and the exhaust muffler room (high-temperature space) 53 and the space for accommodating the engine 5 thereunder are provided. 3 to 6 (or FIG. 7 instead of FIG. 4), the air was introduced into the engine room 50 from the air inlet 43. The cooling air from the engine 5 is supplied to the engine room 50 in front of the engine 5 (in this case, the front of the engine main room 50 a) by the exhaust port 45 opened in the shield plate 40. It is discharged outside through an opening 46 (not shown) through a duct 16 attached along 0, and is not used for cooling the exhaust muffler 53.

FIG. 20 to FIG. 22 disclose embodiments in which the wind after the Lager overnight cooling caused by the Lager overnight cooling fan 14 is effectively used. In each case, The exhaust chamber 50 is separated from the exhaust muffler chamber 53 and the engine main chamber 50 a by a partition wall 25 without an opening 25 a, and a shielding plate 4 in front of the exhaust muffler chamber 53 is provided. 0 has an opening 54, which communicates with the space inside the bonnet 4 where the Rage 13 is located. In this configuration, the cooling air sucked into the radiator cooling fan 14 from the air introduction port 41 is blown backward, introduced into the radiator chamber 53 through the opening 54, and After being cooled, the air is discharged to the outside through an exhaust port 55 formed in a shielding plate 40 at the rear of the Laje night 52 (the rear of the radiator room 53). The cooling air blown backward by the Laje night cooling fan 14 is hot air after the Laje night 13 cooling, and this hot air is discharged into the exhaust muffler, which is a relatively hot part. Effective use for cooling of 52 In addition, dust and the like enter the exhaust muffler chamber 53 through the opening 54 together with the cooling air, but the partition wall 25 prevents them from entering the engine room 50.

In Figs. 21 and 22, the engine cooling fan 15 is not provided, and the cool air blown backward by the Laje night cooling fan 14 is used to cool the engine 5. We use as wind. In some cases, the partition wall 25 may not be provided. In this embodiment, the cooling air whose temperature has risen to that extent may be used when the engine 5 can be cooled with the warm air after the Lager overnight cooling, or for cooling the engine 5 rather than on the heat balance. It is suitable for good cases. Since the engine cooling fan 15 is not provided, an effect that leads to cost reduction can be expected.

In the embodiment of FIG. 21, an opening 56 is formed in the front shielding plate 40 in the upper half of the engine 5, and an exhaust port 45 is formed in the closing plate 40 below the engine 5. Lager — Lager 13, which blows backwards from the evening cooling fan 14 13, blows the wind after the rejection into the engine room 50 (in this embodiment, the engine main room 50 a) through the opening 55. Through the air outlets 4 and 5 In the engine room 50, from the upper front of the engine 5 to the rear lower? The passing wind cools the engine 5. As in the embodiment shown in FIGS. 3, 5, and 6, the electric component 51 attached to the engine 5 should be cooled and shielded so as to face the electric component 51. The closed plate 40 has a ventilation hole 44 formed therein.

In the embodiment shown in FIG. 22, the oil pan 5a which particularly requires cooling is effectively used. An opening 56 is formed in the shielding plate 40 in front of the lower half of the engine 5 so that the cooling air introduced from the opening 56 can be cooled by the oil pan. The shield plate 40 behind the engine 5 or the shield plate 40 below the engine 5 may be formed so as to guide the passage of 5a from the side or below. A guide plate 57 extends from the lower rear end of the rear shroud 19 to the lower end of the opening 56. The guide plate 5 mm It is configured to guide the cooling air that has passed through to the openings 56.

Further, the front end of a baffle duct 58 is disposed behind the cooling fan 14 of the Rajje overnight, and the baffle duct 58 extends rearward to provide a shielding plate 40 in front of the engine 5. And extends further rearward, and has an opening at the rear end near the electrical component 51 attached to the side of the engine 5. As a result, the cooling air of the Laje night can be effectively used as cooling air for the electrical components 51.

Next, a description will be given of an embodiment for preventing dust from entering the engine room 50 in the air guide port 43.

In the embodiment shown in FIG. 23 (a), a plurality of slits are arranged in parallel to form a wind guide port 43. In the embodiment shown in FIG. 23 (b), the air guide port 40 is covered with the mesh sheet material 60. The mesh sheet material 60 may be a metal plate having a plurality of patch holes as ventilation holes.

With such a configuration, the engine cooling air is filtered when introduced into the engine room 50 through the air inlet 43, thereby preventing dust and dirt from entering the engine room 50. In addition, since the inside of the engine room 50 can be maintained in a clean state, the durability of the engine 5 can be increased, and the frequency of maintenance can be reduced.

Lastly, a structure for reducing the vibration and noise of the engine room 50 will be described.

In FIG. 24, an engine 5 is provided with a shielding plate support frame 26, and a plurality of vibration isolator 27 are mounted on the upper portion of the shielding plate support frame 26. The vibration isolator 27 supports the vibration isolator support frame 26 on the vibration isolator 40. In this way, it is possible to prevent the vibration of the engine 5 from propagating to the shielding plate 40 and vibrate the bonnet 5, and further prevent the bonnet 5 from being noisy due to the vibration. It has a structure. In FIG. 25, the engine 5 is hermetically sealed with a first shielding plate 28 to form an engine room 50, and a second shielding plate 29 is first sealed. A sound deadening chamber 59 is provided outside the plate 28 and surrounded by a second shielding plate 29 between the outside and the engine room 50. The engine room 50 and the sound deadening room 59 are communicated by a plurality of communication passages 30, and the sound deadening room 59 and the outside are communicated by a plurality of communication passages 31. In this way, the noise of the engine 5 is once subjected to the silencing action in the silencing chamber 59 through the communication passage 30 and then emitted outside through the communication passage 31. That is, the hollow silencing chamber 59 forms an inflatable silencer, and reduces noise emitted from the engine chamber 50 and the hood 4 to the outside. By using the communication passages 30 and 31, the engine cooling air can be taken into the engine room 50, and the engine room 50 excellent in noise reduction and cooling effect can be provided. Industrial applicability

INDUSTRIAL APPLICABILITY The present invention can be applied not only to the inside of the hood of a vehicle but also to any closed engine room configured to hermetically seal the engine to reduce engine noise. By isolating the Laje night and the Laje night cooling device from the hermetically sealed engine room in which the engine is hermetically sealed, the Laje night cooling air and the engine cooling air of the present invention are provided. The cooling structure can be applied for the efficiency of independence of the cooling structure.

Claims

The scope of the claims

1. A Rajé Izakaya (1 3) and a Lajé Izakaya cooling fan (1 4) are installed outside the sealed engine room (50) that hermetically seals the engine (5). 0) has a wind guide port (43 or 44) for introducing cooling air into the engine room (50) and an exhaust port (45) for discharging cooling air from the engine room (50). In the configuration provided, a cooling air introduced into the engine room (50) from the air guide port (43) is blown by the cooling air fan (14) to the cooling air fan (14). 3) A closed engine room structure characterized by being independent of the cooling air after cooling.

2. The cooling air introduced into the engine room (50) from the air guide port (43 or 44) collides with the cooling target (5a or 51) in a substantially vertical direction. 2. The closed engine room structure according to claim 1, wherein the closed engine room structure is arranged at a position where the engine room is located.

3. The hermetic mold according to claim 2, wherein the air guide port (43) is formed near a lower portion of an oil pan (5a) at a lower end of the engine (5). Engine room structure.

4. In the engine compartment (50), a wind guide (17) is provided near the side surface of the oil pan (5a), and a guide formed near the lower side of the oil pan (5a) is provided. Port

(4) The cooling air taken in from (3) rises along the side of the oil pan (5a) and is guided to the side of the engine (5). 3. The closed engine room structure according to item 3.

5. In the engine room (50), a regulating plate (18) is provided near the front and rear surfaces of the oil pan (5a), and a guide plate is formed below the oil pan (5a). An air pan (5a) for cooling air taken in from an air vent (43) is configured to block a flow in a front-rear direction. Closed engine room structure.

6. The closed engine room structure according to claim 2, wherein the air vent (44) is formed near an electrical component (51) in the engine room (50).

7. The air guide opening (43 or 44) has an opening shape having a length that is substantially half or more with respect to a longitudinal length of the cooling object (5a or 51). 3. The closed engine room structure according to paragraph 2.

8. The sealed engine chamber according to any one of claims 1 to 4, wherein the air guide port (43 or 44) is formed by forming a plurality of slits in parallel.

9. The closed-type engine according to any one of claims 1 to 8, wherein the wind guide port (43 or 44) is covered with a filter member (60).

10. The closed-type engine room (50) is constituted by a shielding plate (40) disposed so as to surround the engine (50), and the wind guide port (43 or 44) is formed. And air outlet

The closed engine room structure according to any one of claims 1 to 9, wherein (45) is formed on the shielding plate (40).

1 1. A casing of an engine cooling fan (15) for generating a flow of cooling air in the engine room (50) from the air guide port (43 or 44) to the exhaust port (45) 10. The closed engine room structure according to claim 10, wherein a ring is attached to said shielding plate (40).

1 2. A shielding plate support frame (26) is fixed to the engine (5), and the shielding plate (40) is attached to the shielding plate (40) via a vibration isolator (27). 6) The closed-type engine room structure according to claim 10 or 11, wherein

1 3. A hollow sound-absorbing room (59) is provided outside the shielding room (40), and the space between the room E (50) and the sound-absorbing room (59) and the sound-absorbing room (5) are provided. The sealing according to any one of claims 10 and 12, characterized in that a communication passage (30 · 31) is formed between the 9) and the outside, respectively. Type engine room structure.

1 4. The engine room (50) is compared with the engine main room (50a) for storing the main body of the engine (5) in the engine room (50) by the partition wall (25). And a high-temperature room (53) for storing a very high-temperature cooling object, and the air introduction port (43 or 44) and the exhaust port (45) are connected to the engine main chamber (50a). ) The closed engine room structure according to any one of claims 1 to 13, characterized in that the engine chamber is formed so as to be formed in a closed manner.

1 5. The wind after cooling the Rajes night (13) blown by the Laje night cooling fan (14) is introduced into the high temperature chamber (53). Item 15. The closed engine room structure according to item 14 above.

1 6. The cooling air drawn into the engine room (50) from the cooling air inlet (43 or 44) is provided to the cooling air (43 or 44) and the air discharging hole (45). Among the cooling objects in the engine room (50), the cooling object having the highest priority (5a or 51) is hit first, and then the cooling air whose temperature has increased cools the relatively high-temperature cooling object to cool the cooling object. The closed engine room structure according to any one of Items 1 to 13, wherein the structure is arranged so as to be exhausted from an exhaust port (45).

1 7. The engine room (50) is compared with the engine main room (50a) that houses the main body of the engine (5) by the partition wall (25) in the engine room (50). And a high-temperature chamber (53) for storing an object to be cooled at a very high temperature. The two spaces (50a and 53) are separated by an opening (25a) formed in the partition wall (25). With the air introduction port (43 or 44) facing the engine main chamber (50a) and the exhaust port (45) facing the high temperature chamber (53). 17. The closed engine room structure according to claim 16, wherein the closed engine room structure is formed.

18. The sealed engine room structure according to any one of claims 14 to 17, wherein the relatively high-temperature object to be cooled is an exhaust muffler (52). Build.

1 9. Due to the suction action of the engine cooling fan (15) disposed in or near the exhaust port (45), the exhaust port (45) is drawn from the air guide port (43 or 44). The closed-type engine room structure according to any one of claims 1 to 18, wherein a cooling wind that passes through the engine room (50) is generated.

20. By the blowing action of the engine cooling fan (15) arranged in or near the air guide port (43), the engine is moved from the air guide port (43) to the exhaust port (45). Claims characterized by generating cooling air passing through the chamber (50). Item 19. A sealed engine room structure according to any one of Items 1 to 18.

2 1. Engine cooling fan (15) Powerfully disposed in or near the opening (25a), sucking cooling air from the engine main chamber (50a), and (53) The sealed engine room structure according to claim 16 or 17, wherein the closed engine room structure is configured to blow out the air to the engine room.

22. The sealed engine room structure according to claim 19, wherein said engine cooling fan (15) is an axial fan.

23. The sealed engine room structure according to any one of claims 19 to 21, wherein the engine cooling fan (15) is a sirocco fan.

24. The method according to any one of claims 19 to 23, wherein the engine cooling fan (15) is disposed on a shaft driven by an engine output. Closed engine room structure.

25. The radiator cooling fan (14) is disposed on the same shaft on which the engine cooling fan (15) is disposed. Closed-type engine room structure.

2 6. A duct (16) is extended from the exhaust port (45), and air after cooling in the engine room (50) is blown from the exhaust port (45) to the duct (16). The sealed engine room structure according to any one of claims 19 to 25, characterized in that the sealed engine room structure is configured to be discharged to the outside air through the airbag.

2 7. The radiator cooling fan (14) is a double-suction sirocco fan, and the cooling air of the radiator (13) is sucked from one of the sirocco fans. Claims 1 to 10 and 12 to 18, wherein the air after cooling inside the engine chamber (50), which is discharged from the engine, is sucked. The closed-type engine room structure described on the contrary.

2 8. The Laje night cooling fan (1 4) is a convection fan, and the suction side is directed to the exhaust port (45), and the outlet side is directed to the Laje night (13). The cooling fan is disposed between the mouth (45) and the radiator (13). A cooling air flow in the engine room (50) from the air guide port (43 or 44) to the exhaust port (45) is generated by the suction action of the an (14). The closed engine room structure according to any one of claims 1 to 10, and 12 to 18.

2 9. A shroud (1 9) is connected to the Laje night (13), and the suction side of the Laje night cooling fan (14) faces the shroud (19). A duct (23) extends from the exhaust port (45) to the shroud (19), and the engine room (50) is sucked by the cooling fan (14). The hermetic seal according to any one of claims 1 to 10, and 12 to 18, wherein the air after the internal cooling is discharged from the exhaust port (45). Type engine room structure.

30. A closed plate (40) is arranged around the engine (50) to form a closed engine room (50). In the configuration where 3) is arranged, an opening (56 or 57) is provided in the shielding plate (40), and the opening (56) is inserted into the engine room (50) through the opening (56). A closed-type engine room structure, characterized by introducing air after cooling the Laje night (13).

3 1. The opening (57) is provided such that cooling air introduced into the engine room (50) through the opening (57) is disposed in the engine room (50). 30. The sealed engine room structure according to claim 30, wherein the engine room is arranged so as to be guided to an oil pan (5a) of the engine (5).

3 2. A closed plate (40) is arranged around the engine (50) to form a closed engine room (50). 3), a duct (58) that extends through the shielding plate (40) and extends into the engine room (50) is provided, and the duct (58) is provided. Through the 8), the wind after cooling (13) is guided to the electrical components (51) attached to the engine (5) in the engine room (50). Closed type