JP4208180B2 - Engine heat transfer cutoff structure to cab in hydraulic excavator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to a technical field of a structure for interrupting engine heat transfer to a cab in a hydraulic excavator.
[0002]
[Prior art]
In general, some work vehicles such as hydraulic excavators have an engine room in which an engine, engine-related equipment, and the like are stored behind a driver's seat. In this case, a partition wall such as a fire wall is disposed between the driver's seat and the engine compartment, and the heat of the engine compartment is transmitted to the driver's seat through the partition wall, There is a problem that the habitability of becomes worse. In particular, in a small model, the space and the engine or the muffler may be arranged close to the driver's seat because the space is small. In such a case, the above-described problem becomes significant.
For this reason, conventionally, a heat insulating material is pasted on a part of the partition wall on the driver's seat side so as to block heat transfer from the engine compartment to the driver's seat. However, this is not a structure that releases heat, so if the operating time becomes longer, heat is gradually accumulated in the heat insulating material, and the heat shielding effect is diminished, or using heat insulating material is a cost. Leading up.
Therefore, a heat insulating air chamber is formed in a layered manner in a portion of the partition wall facing the back of the driver's seat, while a closed auxiliary air chamber is provided on one side of the engine chamber, and the air in the heat insulating air chamber is provided in the auxiliary air chamber. The outlet pipe and the intake pipe of the air cleaner are opened so that air is circulated through the auxiliary air chamber to the heat insulating air chamber by the intake action of the air cleaner, thereby blocking engine heat transfer to the driver's seat What was comprised is advocated (for example, refer patent document 1).
[0003]
[Patent Document 1]
JP 2000-38967 A (FIG. 4)
[0004]
[Problems to be solved by the invention]
However, in the above-mentioned Patent Document 1, the auxiliary air chamber is set to a negative pressure by the intake action of the air cleaner, and the outside air is sucked into the heat insulating air chamber by the negative pressure. In this case, the heat blocking effect is improved. In order to improve the air flow in the heat insulating air chamber as much as possible, it is necessary to increase the negative pressure in the auxiliary air chamber. However, if the negative pressure in the auxiliary air chamber is large, the negative air pressure is supplied to the engine through the air cleaner. There is a problem that the engine efficiency decreases due to insufficient air. Furthermore, if the auxiliary air chamber is narrow, the air from the heat insulating air chamber cannot be allowed to cool, so the space of the auxiliary air chamber needs to be widened to some extent. In this way, an auxiliary air chamber that requires space is provided. This has the problem of hindering the downsizing of the work vehicle, and there has been a problem to be solved by the present invention.
[0005]
[Means for Solving the Problems]
The present invention has been created in view of the above circumstances and has been created for the purpose of solving these problems. In a hydraulic excavator in which an upper swing body is supported by a lower traveling body so as to be rotatable, the upper swing A space that allows air to flow between the cab with the front left driver's seat on the body and the rear engine compartment is provided to cool the rear of the cab, and the space is swung upward. It is provided from the left end of the body in the left-right direction, the engine is stored in the center in the left-right direction, and is generated on the engine chamber side where a cooling fan that is positioned on the right side of the engine and rotates by driving the engine is arranged. The first bulkhead, which is a firewall provided to shut out the fire from reaching the cab, and the position at least beyond the cab from the left end position of the upper swing structure where the cab is provided During the formation of the front and rear double wall structure with the second partition wall erected so as to oppose the first partition wall at the rear side position, the first partition wall is positioned at the front right end portion of the engine. In addition, the left side portion of the cooling fan is inclined toward the rear side toward the right side, the left side portion is formed in a two-stage shape with the inclined portion as a boundary, and the second partition is formed in a first step. Located behind the left side of the bulkhead and standing up from the left end of the upper revolving structure to the vicinity of the inclined part, the gap between the right and left sides of the first bulkhead is substantially the same in the left-right direction. The left side opening communicates with the outside air, and the right side opening is located at the outside air blowing side position of the cooling fan on the left side of the cooling fan through the gap. It is configured to communicate with the cooling air flow path. , Air in the space portion that has flowed from the left side opening, engine heat to the cab in the hydraulic excavator, characterized in that it has to be sucked from the gap in the engine compartment while being guided by the inclined portion by the flow of cooling air of the engine compartment It is a transmission blocking structure.
By doing so, air can be prevented from flowing into the space between the first partition and the second partition, thereby transferring the engine heat to the driver's seat, and the suction force of the air cleaner can be reduced. Since there is no need for an auxiliary air chamber to cool the air as in the case of flowing air using it, there is a possibility that it can contribute to space saving, or there is a problem that the supply air to the air cleaner is insufficient do not do. In addition, since this configuration is configured to flow air through the space using the flow of cooling air flowing through the engine compartment, it does not require a separate means for flowing air and can contribute to cost reduction.
DETAILED DESCRIPTION OF THE INVENTION
Next, a first reference example, an embodiment, and second and third reference examples of the present invention will be described with reference to the drawings.
First, FIG. 1 shows a schematic diagram of a hydraulic excavator in which the first reference example is implemented. In FIG. 1, 1 is a hydraulic excavator, 2 is a crawler type lower traveling body, and 3 is swiveled to a lower traveling body 2. It is an upper turning body supported freely.
[0007]
The upper rotating body 3 is the left-right direction substantially central portion front side working device 4 is attached, in the front left of the working device 4, including a operator sits the driver's seat (not shown) A cab 5 is disposed, and a tank chamber 6 in which a hydraulic oil tank and a fuel tank are accommodated is disposed on the second half side on the right side of the working device 4, and hydraulic devices such as a control valve unit are disposed on the first half side. The equipment room 7 to be stored is arranged. Further, a center chamber 10 in which the swivel joint 8 and the swing motor device 9 are arranged in a state of being located between the cab 5 and the tank chamber 6 is formed behind the attachment portion of the working device 4.
[0008]
On the other hand, an engine room 11 is arranged at the rear part of the upper swing body 3. The engine room 11 houses an engine 12 at the center in the left-right direction. A cooling fan 13 that rotates by driving, a cooling unit 14 including a radiator, an oil cooler, and the like are disposed, and a hydraulic pump 15 is disposed on the left side of the engine 12. In FIG. 1, 16 is a muffler disposed on the upper left side of the engine 12, and 17 is a counterweight disposed on the rear side of the engine chamber 11.
[0009]
Here, the left and right side covers 18, 19 that cover the left and right sides of the engine chamber 11 and the bottom cover 20 that covers the bottom are provided with a large number of vent holes 18a, 19a, 20a. And the cooling air which flowed in from the ventilation hole 19a of the right side cover 19 by the suction force of the cooling fan 13 cools the cooling unit 14, and then cools the engine 12 and the muffler 16, and the left side cover 18 and the bottom cover. It flows out of 20 vent holes 18a, 20a (see FIG. 2).
[0010]
As described above, the cab 5, the center chamber 10, and the tank chamber 6 are arranged on the front side of the engine chamber 11, and between the engine chamber 11 and the cab 5, the center chamber 10, and the tank chamber 6. Is provided with a first partition wall (fire wall) 22 that extends over substantially the entire lateral width of the upper swing body 2, and is configured to be able to shut out an emergency fire. Further, behind the first partition wall 22, a second partition wall 23 is erected from the left end portion of the upper swing body 2 to the vicinity of the right end portion of the cooling unit 14. These first and second partition walls 22, 23 are In the state where the space portion 24 exists, it is arranged so as to face in the front-rear direction. The left and right ends of the space 24 between the first and second partition walls 22 and 23 are open, the left opening 24a communicates with outside air, and the right opening 24b sucks cooling air into the engine compartment 11. It communicates with the side. Thus, the air in the space portion 24 is sucked into the cooling unit 14 together with the cooling air flowing from the right side cover 19 by the suction force of the cooling fan 13 described above, and further receives the suction force to Outside air flows in from the left side opening 24a, and thereby, air is configured to flow from the left side opening 24a of the space portion 24 toward the right side opening 24b. The air flowing through the space 24 can prevent the heat of the engine 12 and the muffler 16 from being transmitted to the driver's seat in the cab 5 and can cool the back portion of the driver's seat. Yes.
[0011]
In the first reference example configured as described above, a double wall composed of a first partition wall 22 and a second partition wall 23 facing each other with a space 24 between the cab 5 and the engine compartment 11. A partition wall having a structure is disposed, and the left side opening 24a of the space portion 24 communicates with the outside air, while the right side opening 24b communicates with the cooling air suction side of the cooling unit 14 of the engine chamber 11, thereby In the space 24, air flows from the left opening 24a toward the right opening 24b. Thus, the air flowing through the space 24 can prevent the heat of the engine 12 and the muffler 16 from being transmitted to the driver seat in the cab 5 and can cool the back portion of the driver seat. Although it is possible to improve the comfortability of the operator sitting in the driver's seat, this is a configuration for flowing air through the space portion 24 using the suction force of the cooling fan 13, and therefore means for flowing air It is possible to contribute to cost reduction without requiring an additional air chamber, and it does not require an auxiliary air chamber for allowing the air to cool like the air flowing using the suction force of the air cleaner. Forgiveness, it is also possible to avoid the occurrence of problems such as insufficient air supply to the air cleaner.
[0012]
Next, schematic views of the hydraulic excavator in which the embodiment of the present invention, the second and third reference examples are implemented are shown in FIGS. 3, 4, and 5, respectively, and the hydraulic excavator 1 in each of these embodiments is shown. Since the configuration, the arrangement in the engine chamber 11 and the flow of the cooling air flowing in the engine chamber 11 are the same as those in the first reference example described above, the same reference numerals are given and the details thereof are omitted. .
[0013]
First, an embodiment of the present invention will be described with reference to FIG. 3. In this embodiment, the first revolving body 2 extending in the left-right direction between the engine chamber 11, the cab 5, the center chamber 10 and the tank chamber 6 is described. One partition wall (firewall) 25 is erected and is configured to be able to shut out an emergency fire. The first partition wall 25 has a front and rear portion located in front of the right end portion of the engine 12. The left portion 25b is formed in two steps so that the left portion 25b is located in front of the right portion 25c with the inclined portion 25a as a boundary. That is, as shown in FIG. 3, the first partition wall 25 is formed with an inclined portion 25 a in a state where the left portion of the engine is inclined forward toward the right side at the front position of the right end portion of the engine. . Further, a second partition wall 26 is erected from the left end portion of the upper swing body 2 to the vicinity of the inclined portion 25a of the first partition wall 25 at the rear of the left portion 25b of the first partition wall 25. The two partition walls 26 are opposed to the left side portion 25b of the first partition wall 25 in the front-rear direction with the space 27 between them, and at substantially the same front-rear position with respect to the right side portion 25c of the first partition wall 25, In addition, the gap 28 is disposed in the left-right direction. The left and right ends of the space 27 between the left part 25b of the first partition 25 and the second partition 26 are open at the left and right ends, and the left opening 27a communicates with the outside air, while the right opening 27b As shown in FIG. 3, the cooling fan 13 communicates with the cooling air flow passage in the engine chamber 11 at a position outside the cooling fan 13 that is on the left side of the cooling fan 13 . Thus, the air in the space portion 27 is sucked into the engine chamber 11 while being guided by the inclined portion 25a by the flow of cooling air in the engine chamber 11, and further receives the suction force to open the left side opening of the space portion 27. Outside air flows in from 27a. Thereby, it is comprised so that air may flow toward the right side opening 27b from the left side opening 27a of the space part 27. FIG.
[0014]
Even in those embodiments of the present invention, the air flowing through the space 27, the heat of the engine 12 and the muffler 16 is supposed to be possible to prevent transmitted to the driver's seat in the cab 5, the The point has the same effect as the first reference example described above.
[0015]
Next, the second reference example will be described with reference to FIG. 4. In this example , the same first and second partition walls 29 and 30 as those in the first reference example are provided. Between the partition walls 29 and 30, a space portion 31 is formed in which the left opening 31 a communicates with the outside air and the right opening 31 b communicates with the engine compartment 11. Furthermore, a fan 32 that blows air toward the right opening 31 b of the space 31 is installed in the engine room 11 of the second reference example at a right front position of the cooling unit 14. And it is comprised so that air may flow toward the left side opening 31a from the right side opening 31b of the space part 31 by the ventilation from this fan 32. FIG.
[0016]
Even in the second reference example , the air flowing through the space portion 31 provides the same effects as those of the first reference example and the embodiment of the present invention described above. Therefore, there is an advantage that air can be positively flowed and air blowing to the space 31 can be arbitrarily stopped by driving and stopping the fan 32. is there.
[0017]
Further, a third reference example will be described with reference to FIG. 5. In this example, the first revolving body 2 in the left-right direction between the engine chamber 11, the cab 5, the center chamber 10, and the tank chamber 6 extends in the left-right direction. A partition wall (fire wall) 33 is erected and is configured to be able to shut out an emergency fire. On the front side of the first partition wall 33, there is a cab 5 from the left end of the upper swing body 2. A second partition wall 34 is provided up to the vicinity of the right end. And these 1st, 2nd partition 33, 34 is arrange | positioned so that it may oppose in the front-back direction in the state which has the space part 35 in between, but this space part 35 has opened both right and left ends, The left side opening 35 a communicates with the outside air, while the right side opening 35 b communicates with the center chamber 10.
[0018]
Further, the center chamber 10 is provided with a fan 36 that blows air toward the right opening 35b of the space 35. Further, the right end portion of the second partition wall 34 is formed in an inclined shape 34 a so as to guide the air blown from the fan 36 to the space portion 35. Further, the center chamber 10 is provided with an opening (not shown) that communicates with the outside air on the front surface side or the upper surface side so that the outside air can be taken in from the opening. Thus, air is configured to flow from the right opening 35b of the space 35 toward the left opening 35a based on the driving of the fan 36.
[0019]
Even in the third reference example , the air flowing through the space portion 35 provides the same effects as those of the first reference example, the embodiment of the present invention, and the second reference example described above. Similarly to the second reference example , since the air is caused to flow through the space 35 by the separately installed fan 36, the air can be actively flowed, and the fan 35 can be driven and stopped to stop the space 35. There is an advantage that it is possible to arbitrarily perform air blowing to air blowing and air blowing stop.
[0020]
Of course, the present invention is not limited to the above-described embodiment. If the first and second partition walls are disposed so as to separate the engine compartment and the driver's seat, the range and shape of the partition are arranged. The design can be appropriately changed depending on the layout of other member devices.
[Brief description of the drawings]
FIG. 1 is a schematic view of a hydraulic excavator showing a first reference example .
FIG. 2 is an explanatory diagram showing the flow of cooling air in the engine compartment.
FIG. 3 is a schematic diagram of a hydraulic excavator showing an embodiment of the present invention .
FIG. 4 is a schematic diagram of a hydraulic excavator showing a second reference example .
FIG. 5 is a schematic diagram of a hydraulic excavator showing a third reference example .
[Explanation of symbols]
5 cab 11 engine room 22 first partition 23 second partition 24 space 25 first partition 26 second partition 27 space 29 first partition 30 second partition 31 space 32 fan 33 first partition 34 second partition 35 space Part 36 fans

Claims (1)

In a hydraulic excavator in which an upper swing body is supported by a lower traveling body in a freely swingable manner, a space portion through which air flows between a cab having a front left driver's seat provided on the upper swing body and a rear engine compartment is provided. And the rear portion of the cab is cooled, and the space is provided from the left end of the upper swing body to the left and right, and the engine is housed in the center in the left and right direction. A first partition that is a firewall provided to shut out the fire that has occurred on the engine compartment side, which is located at the engine drive, and is rotated by the engine drive, to reach the cab, and the upper swing provided with the cab Front / rear double-wall structure with a second bulkhead standing so as to face the first bulkhead at a rear position from the left end position of the body to a position exceeding at least the cab In forming the first partition wall, the first partition wall is inclined to the rear of the right side of the engine and the left side of the cooling fan toward the right side. It is formed in a two-stage shape located in the front, the second partition wall is located behind the left portion of the first partition wall, and is erected so as to extend from the left end portion of the upper swing body to the vicinity of the inclined portion, It is arranged so that there is a gap in the left-right direction at substantially the same front-rear position with respect to the right side portion of the first partition wall, the left side opening communicates with the outside air, and the right side opening passes through the gap. The cooling fan is configured to communicate with the cooling air flow path of the engine room at a position outside the cooling fan on the left side of the cooling fan. Is not guided by the slope Engine heat transfer blocking structure to the cab in the hydraulic excavator, characterized in that it has to be sucked from the gap to the engine compartment.

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