JP3898977B2 - Engine equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an engine apparatus having a structure for isolating an engine chamber and a pump chamber.
[0002]
[Prior art]
As shown in FIG. 2, the construction machine (hydraulic excavator) has a cab 3 and a work device 4 mounted on the front of the upper swing body 2 provided on the lower traveling body 1 and a counterweight 5 on the rear. An engine device 6 is mounted.
[0003]
FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. In the engine chamber 11 and its surrounding structure, the hydraulic actuator of the working device 4 is usually driven with respect to the engine 12 housed in the engine chamber 11. A hydraulic pump 13 serving as a power source for the hydraulic circuit and a cooling device (that is, a radiator and an oil cooler) 14 for cooling cooling water for engine cooling and hydraulic oil for the hydraulic circuit are arranged. As noise reduction progresses, as one of the considerations, a partition body 15 called an enclosure is provided around the engine room 11, and the engine 12 that is a noise generation source is surrounded by the partition body 15, and is generated from the engine 12. It is structured to confine noise and reduce machine noise.
[0004]
When this structure is adopted, the engine chamber 12 can be shut out and the pump chamber 16 containing the hydraulic pump 13 and the engine chamber 11 can be partitioned. Even if such a situation occurs, it is possible to avoid a situation in which the oil is applied to a high temperature part such as the muffler 17 accommodated in the engine room 11.
[0005]
However, on the other hand, since the heating element called the engine 12 is housed in the enclosure, the temperature rise in the engine compartment 11 becomes significant.
[0006]
For this reason, it is required to improve the weather resistance of the parts attached to the engine 12 and the cost is high, and the engine room peripheral cover 18 that can be opened and closed on the pump room 16 together with the engine room upper cover 20 is also heated. Inconvenience occurs when an operator opens a part of the room peripheral cover 18 to work.
[0007]
In order to avoid this, ventilation of the engine compartment 11 is essential, and therefore, as shown in FIG. 3, an ejector 19 that uses the momentum of the exhaust gas flow exhausted from the muffler 17 is mounted.
[0008]
The ejector 19 includes a muffler chimney 19a drawn out from the muffler 17 and an exhaust pipe 19b protruding above the engine compartment upper cover 20 in a concentric manner through a gap 19c. A ventilation system that uses the negative pressure generated around the muffler exhaust gas flow ejected from the chimney portion 19a into the exhaust pipe 19b to suck and ventilate the air in the engine compartment 11, such an engine compartment. A design that considers ventilation is required.
[0009]
[Problems to be solved by the invention]
In this way, in order to prevent engine noise from leaking to the outside, if the engine room 11 is not sufficiently ventilated, a heating element called the engine 12 is housed in the enclosure. The temperature inside the engine compartment 11 increases significantly, adversely affects the durability of the components disposed in the engine compartment 11, or the engine compartment peripheral cover 18 together with the engine compartment upper cover 20 becomes hot. Inconvenience occurs when an operator opens a part of the work.
[0010]
In addition, air in the engine compartment 11 is forcibly discharged to the outside due to the ventilation effect of the ejector 19, but an opening on the air suction side into the engine compartment 11 is prevented in order to prevent engine noise from leaking outside. The total area is narrow, and only the outside air is sucked into the engine compartment 11 through a slight gap between the engine compartment covers, so the inside of the engine compartment 11 becomes negative pressure.
[0011]
Due to this phenomenon, when oil leakage occurs in the pump chamber 16 due to any factor, air containing oil from the slight gap of the partition wall 15 between the engine chamber 11 and the pump chamber 16 toward the engine chamber 11 There is a risk that this oil will come into contact with a high temperature part such as the muffler 17.
[0012]
The present invention has been made in view of the above points, and ensures sufficient ventilation in the engine room having a low noise structure to solve the problem caused by insufficient ventilation. It is an object of the present invention to provide an engine device that is not affected by oil leakage.
[0013]
[Means for Solving the Problems]
The present invention includes an engine chamber that houses an engine, a partition body that surrounds the engine chamber, a pump chamber that houses a hydraulic pump that is disposed on one side of the engine chamber via the partition body, and is driven by the engine, A cooling device chamber disposed on the other side via a partition wall and containing a cooling device having a cooling fan for cooling the engine cooling medium and hydraulic oil of the hydraulic pump; and a partition body between the engine chamber and the cooling device chamber A cooling air intake hole for taking in cooling air blown from the cooling fan of the cooling device that is a part of the cooling device and opened to a position facing the cooling fan of the cooling device, and from the cooling air intake hole to the inside of the engine compartment An engine noise attenuating duct that is bent over the lower part and has an opening at the lower part of the engine room, and a flow of exhaust gas that is provided at the upper part of the engine room and exhausted from the engine The utilizing an engine apparatus comprising a ejector for forcibly ventilating the engine room air, by the cooling air blown from the cooling fan of the cooling device taking the engine compartment from the cooling air Tokomiana, low Even in an engine room with a noise reduction structure, the temperature in the engine room is lowered by sufficient ventilation to eliminate the problems associated with the temperature rise in the engine room caused by insufficient ventilation, and the cooling air from the cooling fan is forced. An engine device that prevents the engine chamber from sucking air containing oil even if oil leakage occurs in the pump chamber is prevented by taking into the engine chamber to prevent negative pressure in the engine chamber can Ru. By providing a cooling air intake hole at a position facing the cooling fan of the cooling device, the cooling fan of the opposing cooling device drowns out the sound that leaks from the engine compartment through the cooling air intake hole to the outside. Therefore, the noise reduction effect by the partition wall can be maintained. Inside the duct provided in the bent shape from the cooling air intake hole over the lower portion of the engine room, there is a damping effect of the engine noise, while reducing the noise leaking from the engine compartment by the duct, sufficient cooling The opening area of the cooling air intake hole that can supply the air volume can be secured. By taking in and utilizing the cooling air blown from the cooling device into the engine compartment, the effect of the ejector that forcibly ventilates the engine compartment air can be enhanced, and the ventilation performance can be improved.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIG.
[0015]
As shown in FIG. 1, the engine room 22 that houses the engine 21 is surrounded by a partition wall (enclosure) 23 having sound insulation properties.
[0016]
A pump chamber 25 accommodating a hydraulic pump 24 driven by the engine 21 is disposed with respect to the central engine chamber 22 via a partition wall 23a on one side. A part of the engine room peripheral cover 26 provided at the upper part of the pump room 25 is provided so that it can be opened and closed by an operator.
[0017]
In addition, a cooling device chamber 28 containing a cooling device 27 is disposed with respect to the central engine chamber 22 via a partition wall 23b on the other side. The partition walls 23a and 23b are a part of a series of partition walls 23 surrounding the engine compartment 22.
[0018]
The cooling device 27 is integrated with a heat exchanger such as a radiator for cooling the cooling water, which is a cooling medium for cooling the engine 21, and an oil cooler for cooling the hydraulic circuit hydraulic oil supplied from the hydraulic pump 24. In addition, a cooling fan 29 is provided on the engine chamber 22 side from these heat exchangers.
[0019]
The driving means 30 of the cooling fan 29 may be a hydraulic motor. However, in the case of hydraulic driving, there is a possibility that the engine chamber 22 may be adversely affected when oil leakage occurs. It is desirable.
[0020]
In the engine compartment 22, an engine controller 31 for controlling the operating state of the engine 21 is installed together with the engine 21. A muffler 32 that silences exhaust sound generated from the engine 21 is disposed above the engine 21.
[0021]
Further, an ejector 33 for ventilating the engine room using the momentum of the exhaust gas flow exhausted from the muffler 32 is mounted on the upper part of the engine room 22. This ejector 33 has a small-diameter cylindrical muffler chimney 34 drawn out from the muffler 32 and a large-diameter cylindrical exhaust pipe 35 protruding above the engine compartment upper cover 40 in a concentric manner via a gap 36. Is fitted.
[0022]
This ejector 33 generates a negative pressure lower than the atmosphere around the muffler exhaust gas flow injected from the engine 21 through the muffler 32 into the exhaust pipe 35 from the muffler chimney 34. Using this, the air inside the engine compartment 22 is forcibly ventilated by sucking the air inside the engine compartment 22 from the gap 36 to the negative pressure generating portion.
[0023]
A suction port 37 for sucking outside air is provided in the shielding plate opposite to the partition wall 23b in the cooling device chamber 28, and the cooling fan 29 blows air obliquely above the cooling fan 29. An exhaust port 38 for discharging the cooling air to the outside is provided.
[0024]
The partition wall 23b between the engine chamber 22 and the cooling device chamber 28 has an inclined plate portion 39 that is bent toward the engine chamber 22 above the center portion, and the cooling fan 29 is formed by the inclined plate portion 39. Is formed so that the air flow from the air to the air outlet 38 is smooth.
[0025]
On the other hand, a part of the cooling air blown from the cooling fan 29 of the cooling device 27 is partly below the central portion in the partition wall 23b between the engine chamber 22 and the cooling device chamber 28. A cooling air intake hole 41 for taking in is opened.
[0026]
The cooling air intake hole 41 is provided in a partition wall position facing the cooling fan 29 of the cooling device 27, that is, in a range where the cooling air is directly received from the cooling fan 29.
[0027]
Further, a bent duct 42 is provided on the engine chamber 22 side from the cooling air intake hole 41.
[0028]
That is, the duct 42 has a horizontal pipe portion 43 connected to the peripheral edge of the cooling air intake hole 41, and an inclined pipe portion 44 that is bent at an obtuse angle obliquely downward with respect to the horizontal pipe portion 43 is continuously provided. In addition, a horizontal pipe portion 45 bent at an obtuse angle with respect to the lower end portion of the inclined pipe portion 44 is continuously provided.
[0029]
The cooling air intake hole 41 needs to limit the opening area so that the machine noise generated from the engine 21 does not leak to the outside as much as possible, but by providing the duct 42, the noise generated from the engine 21 is attenuated. In particular, by providing the cooling-air intake hole 41 with a bent duct 42 with an obtuse angle bend, the effect of attenuating noise is large, in other words, sufficient for the cooling air intake hole 41. An opening area can be secured.
[0030]
Further, the engine controller 31 is disposed obliquely above the tip opening 46 located between the tip opening 46 of the horizontal pipe portion 45 of the duct 42 and the ejector 33.
[0031]
Since one side part and the other side part of the machine body are provided with a step 47 that serves as a scaffold for the operator, the operator opens the engine room peripheral cover 26 and the like on this step 47, and the pump room 25 Maintenance work such as inside.
[0032]
Next, the function and effect of the embodiment shown in FIG. 1 will be described.
[0033]
When the cooling fan 29 of the cooling device 27 rotates, heat exchange in the radiator and the oil cooler of the cooling device 27 is promoted by the external air sucked from the suction port 37 by the cooling fan 29, and the engine cooling water and the hydraulic circuit are operated. Oil etc. are cooled.
[0034]
Most of the air whose temperature has been increased by exchanging heat with the high-temperature engine coolant and hydraulic oil is exhausted to the outside from the upper exhaust port 38.
[0035]
On the other hand, a part of the cooling air blown from the cooling fan 29 is also taken into the engine chamber 22 through the duct 42 from the cooling air intake hole 41 by the suction action by the ejector 33, and the high-temperature engine 21 and It functions as cooling air for the muffler 32 and the like, and is discharged to the outside by the ejector 33 while cooling the engine 21, the engine controller 31, the muffler 32, and the like.
[0036]
Thus, the cooling air blown from the cooling fan 29 of the cooling device 27 is taken into the high-temperature engine compartment 22 through the duct 42 from the cooling air intake hole 41 of the partition wall 23b and used for ventilation. Even in the engine room 22 with a low noise structure by the body 23, a sufficient ventilation amount can be secured, the temperature in the engine room 22 can be lowered efficiently, and the temperature rise in the engine room 22 caused by insufficient ventilation Therefore, the reliability of the engine room equipment can be prevented and the reliability of the engine controller 31, etc. can be improved, and the temperature rise of the engine room upper cover 40 and the engine room peripheral cover 26 can be suppressed, and the engine room surroundings can be controlled. It is easy for an operator who opens a part of the cover 26 and puts his hand in the pump chamber 25 to work.
[0037]
Furthermore, the air in the engine room is forced by taking in and using the cooling air blown from the cooling fan 29 of the cooling device 27 into the hot engine room 22 from the cooling air intake hole 41 of the partition wall 23b. In addition to improving the effect of the ejector 33 that ventilates the air and improving the ventilation performance, the cooling air sent from the cooling device room 28 into the engine room 22 by the air blowing action of the cooling fan 29 is sent to the cooling air. Since the pressure inside the engine chamber 22 is increased as compared with the case where there is no pressure, it is possible to prevent the engine chamber 22 from becoming a negative pressure.
[0038]
Thereby, when an oil leak or the like occurs from the hydraulic pump 24 in the pump chamber 25 or the like, the engine chamber 22 of negative pressure sucks air containing oil from the pump chamber 25 through a gap such as the partition wall 23a, It is possible to prevent the oil from coming into contact with the hot muffler 32 or the like.
[0039]
In addition, by providing a cooling air intake hole 41 in the partition wall 23b at a position facing the cooling fan 29 of the cooling device 27, the sound of leaking from the engine chamber 22 through the cooling air intake hole 41 to the outside. Since the cooling fan 29 of the cooling device 27 acts so as to blow out the noise, the noise reduction effect by the partition wall 23b can be maintained.
[0040]
In addition, there is an engine noise attenuation effect inside the duct 42, and in particular, the engine noise attenuation effect is significant inside the bent duct 42, so this duct 42 reduces noise leakage from the engine compartment 22. However, a sufficiently large opening area can be secured in the cooling air intake hole 41, and a sufficient amount of cooling air can be supplied from the cooling device chamber 28 into the engine chamber 22.
[0041]
【The invention's effect】
According to the present invention, the cooling air blown from the cooling fan is taken into the engine room through the cooling air intake hole opened in the partition body, so that sufficient ventilation is achieved even in the engine room having a low noise structure by the partition body. This reduces the temperature in the engine compartment and solves the problems associated with the temperature rise in the engine compartment caused by insufficient ventilation, and forcibly takes in the cooling air from the cooling fan into the engine compartment. It is possible to provide an engine device that prevents the negative pressure from being blocked and prevents the engine chamber from sucking air containing the oil even if oil leakage occurs in the pump chamber. By providing a cooling air intake hole at a position facing the cooling fan of the cooling device, the cooling fan of the opposing cooling device drowns out the sound that leaks from the engine compartment through the cooling air intake hole to the outside. Therefore, the noise reduction effect by the partition wall can be maintained. Inside the duct that is bent from the cooling air intake hole to the lower part of the engine compartment, there is an engine noise attenuating effect. This duct reduces the noise leakage from the engine compartment while ensuring sufficient cooling air flow. The opening area of the cooling air intake hole can be secured. By taking in and utilizing the cooling air blown from the cooling device into the engine compartment, the effect of the ejector that forcibly ventilates the engine compartment air can be enhanced, and the ventilation performance can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of an engine apparatus according to the present invention.
FIG. 2 is a front view of a hydraulic excavator.
3 is a cross-sectional view of a conventional engine apparatus showing a cross section taken along line III-III in FIG.
[Explanation of symbols]
21 engine
22 Engine compartment
23, 23a, 23b Bulkhead
24 Hydraulic pump
25 Pump room
27 Cooling device
28 Cooling room
29 Cooling fan
33 Ejector
41 Cooling air intake hole
42 Duct

Claims (1)

An engine compartment that houses the engine;
A bulkhead body surrounding the engine compartment;
A pump chamber containing a hydraulic pump disposed on one side of the engine chamber via a partition wall and driven by the engine;
A cooling device chamber containing a cooling device that is disposed on the other side of the engine chamber via a partition wall and has a cooling fan that cools the engine cooling medium and the hydraulic oil of the hydraulic pump;
Cooling air intake that takes in the cooling air blown from the cooling fan of the cooling device that is a part of the partition wall between the engine chamber and the cooling device chamber and is opened at a position facing the cooling fan of the cooling device. A hole ,
A duct for attenuating engine noise provided in a bent shape from the cooling air intake hole to the lower part of the engine compartment, and having a tip opened at the lower part of the engine compartment;
An engine apparatus comprising: an ejector provided at an upper part of an engine room and forcibly ventilating engine room air using a flow of exhaust gas exhausted from the engine.

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