JP2006224812A - Construction machine - Google Patents

Construction machine Download PDF

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Publication number
JP2006224812A
JP2006224812A JP2005040945A JP2005040945A JP2006224812A JP 2006224812 A JP2006224812 A JP 2006224812A JP 2005040945 A JP2005040945 A JP 2005040945A JP 2005040945 A JP2005040945 A JP 2005040945A JP 2006224812 A JP2006224812 A JP 2006224812A
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Japan
Prior art keywords
heat exchanger
cooling air
air
building cover
cooling
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Pending
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JP2005040945A
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Japanese (ja)
Inventor
Yasushi Arai
Hiroyuki Kamata
Seiichiro Takeshita
Osamu Watanabe
修 渡邉
清一郎 竹下
康 荒井
博之 鎌田
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Hitachi Constr Mach Co Ltd
日立建機株式会社
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Application filed by Hitachi Constr Mach Co Ltd, 日立建機株式会社 filed Critical Hitachi Constr Mach Co Ltd
Priority to JP2005040945A priority Critical patent/JP2006224812A/en
Publication of JP2006224812A publication Critical patent/JP2006224812A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To improve cooling efficiency of a heat exchanger by supplying cooling air in a well-balanced manner to the entire surface of a heat exchanger even when devices that obstruct the flow of cooling air are arranged in a building cover.
An additional inlet for supplying cooling air to a space 18 between a first heat exchanger assembly 10 and a second heat exchanger assembly 14 is provided in a rear plate 19D of the building cover 19. 21 is provided. Thereby, even when the upstream second heat exchanger assembly 14 becomes an obstacle and a place where the first heat exchanger assembly 10 is not exposed to the cooling air is formed, the additional inlet 21 is located at this place. Cooling air can be supplied in a concentrated manner. Therefore, the cooling air can be supplied in a well-balanced manner to the entire surface of the radiator 11, the oil cooler 12, and the intercooler 13 constituting the first heat exchanger assembly 10, and the cooling efficiency thereof can be improved.
[Selection] Figure 3

Description

  The present invention relates to a construction machine such as a hydraulic excavator or a wheel loader, and more particularly to a construction machine provided with a heat exchanger such as a radiator or an oil cooler.

  In general, a hydraulic excavator as a construction machine is provided with a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a front-rear side of the upper revolving body that can be raised and lowered. It is comprised by the working apparatus which consists of a boom, an arm, a bucket, etc.

  The upper swing body is a swing frame that forms a support structure, a cab provided on the front side of the swing frame, and a counter that is attached to a rear portion of the swing frame and that balances the weight of the working device. A weight, an engine mounted on the rear side of the swivel frame and driving a hydraulic pump; a radiator that cools cooling water of the engine; an oil cooler that cools hydraulic oil; and the engine, radiator, oil cooler, and the like. It is roughly composed of a building cover that covers it.

  Here, the engine is provided with a cooling fan that generates cooling air, and the building cover is formed with an air inlet and an air outlet, and is sucked from the air inlet by driving the cooling fan. Air can be supplied to radiators, oil coolers, and the like.

  An air conditioner indoor unit is provided in the cab, and a capacitor constituting the air conditioner outdoor unit is provided in the building cover. And the capacitor | condenser in a building cover is arrange | positioned in the upstream of a cooling wind rather than a radiator and an oil cooler, for example, The both sides of the left and right direction are supported via the bracket (for example, refer patent document 1). .

JP 2004-60933 A

  By the way, since recent hydraulic excavators are increasingly used in narrow places such as urban areas, there is a need for a small-swivel hydraulic excavator having an upper swinging body that can be swiveled within the width of the lower traveling body. It is growing. In this small swivel excavator, the counterweight is brought close to the swivel center to form a compact upper swivel.

  Here, since the counterweight balances the weight with the working device, when it comes close to the turning center, the weight must be increased by that much, and the space required for installation becomes large. End up. For this reason, since the space in the building cover located on the front side of the counterweight is reduced, the engine, radiator, oil cooler, and the like housed in this space must be downsized. However, when a heat exchanger such as a radiator or an oil cooler is downsized, there is a problem that it is difficult to maintain the cooling efficiency because the area for receiving the cooling air becomes small.

  Moreover, in order to obtain a large weight while securing the installation space for the engine, radiator, oil cooler, and the like, the counterweight has its left and right sides pushed forward to the engine position. For this reason, the position and size of the air inlet and the air outlet formed in the building cover are also restricted.

  In addition, equipment installed in the building cover, such as condensers, radiator reservoir tanks, washer fluid tanks, air cleaners, etc., may be placed at locations that interfere with the flow of cooling air upstream of the radiator and oil cooler. In this case, there is a problem that these devices become obstacles and cooling air cannot be supplied over the entire surface of the radiator and the oil cooler, resulting in a decrease in cooling efficiency.

  The present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is to provide a good balance over the entire surface of the heat exchanger even when devices that obstruct the flow of cooling air are arranged in the building cover. An object of the present invention is to provide a construction machine that can improve the cooling efficiency of a heat exchanger by supplying cooling air.

  The construction machine according to the present invention is cooled by supplying a frame that forms a support structure, a prime mover provided on the frame, a cooling fan that rotates using the prime mover as a power source, and cooling air from the cooling fan. A heat exchanger for exchanging heat of the fluid to be supplied, and a device that is provided facing the heat exchanger in the front and rear direction with respect to the flow direction of the cooling air by the cooling fan and obstructs the flow of the cooling air And a building cover that covers the prime mover, the cooling fan, the heat exchanger, and the devices and has an air inlet and an air outlet for circulating cooling air.

  And in order to solve the subject mentioned above, the feature of the configuration adopted by the invention of claim 1 is that the building cover is formed between the heat exchanger and the equipment with respect to the flow direction of the cooling air. An additional inflow port for allowing cooling air to flow into the space is provided separately from the air inflow port.

  According to the invention of claim 2, the frame is provided with a counterweight located on the rear side of the building cover, and the additional inflow port faces the counterweight at a position corresponding to the space. The configuration is provided on the rear surface.

  According to invention of Claim 3, the said heat exchanger is comprised including the radiator and oil cooler which were arrange | positioned in parallel with respect to the flow direction of a cooling wind, The said equipment is separately from the said heat exchanger. It is another heat exchanger arranged.

  According to the invention of claim 4, the equipment is one of an air cleaner, a battery, and a tank for storing various liquids.

  According to the first aspect of the present invention, the building cover is provided with an additional inlet for allowing cooling air to flow into the space formed between the heat exchanger and the equipment separately from the air inlet. Even if the equipment becomes an obstacle and the place where the cooling air does not hit the heat exchanger, the additional inflow port supplies the cooling air to this place without being obstructed by the equipment. can do. Moreover, the additional inlet can efficiently supply the cooling air to the heat exchanger even when the air inlet is restricted in position, size, and the like.

  As a result, even when the equipment is arranged at a position where the flow of the cooling air is blocked on the upstream side of the heat exchanger, the cooling air can be supplied in a well-balanced manner over the entire surface of the heat exchanger. The cooling efficiency can be improved.

  According to the invention of claim 2, since the additional inlet is provided on the rear surface of the building cover facing the counterweight so as to correspond to the space between the heat exchanger and the equipment, the additional inlet is provided. It can be covered with a counterweight, and noise leakage can be suppressed.

  According to the invention of claim 3, even when a radiator, an oil cooler, etc. are arranged in parallel with respect to the flow direction of the cooling air, the additional inlet supplies the cooling air in a well-balanced manner over the entire surface of the radiator and the oil cooler. can do. In addition, the additional inflow port can supply the cooled cooling air, not the cooling air warmed by passing through other heat exchangers, to the radiator, the oil cooler, etc., and can improve the cooling efficiency of these. .

  According to the invention of claim 4, even when any one of the air cleaner, the battery, and the tank storing various liquids obstructs the flow of the cooling air, the additional inlet is cooled to a place where the cooling air is difficult to be supplied. Wind can be supplied.

  Hereinafter, as a construction machine according to an embodiment of the present invention, a small turning type hydraulic excavator provided with an upper turning body that can turn substantially within the vehicle width of the lower traveling body will be described as an example, and the details will be described with reference to FIGS. Explained.

  In FIG. 1, reference numeral 1 denotes a crawler-type hydraulic excavator as a construction machine. The hydraulic excavator 1 includes a lower traveling body 2 capable of self-propelling and an upper revolving body 3 mounted on the lower traveling body 2 so as to be capable of swiveling. And a work device 4 that is provided on the front side of the upper swing body 3 so as to be able to move up and down and that performs excavation work of earth and sand. Here, the excavator 1 has a small counterweight 7 which will be described later close to the turning center to make the upper turning body 3 compact so that the upper turning body 3 can turn almost within the vehicle width of the lower traveling body 2. It is configured as a swivel excavator.

  Reference numeral 5 denotes a revolving frame constituting the upper revolving structure 3, and the revolving frame 5 is formed as a support structure. Then, as shown in FIG. 4, the revolving frame 5 is provided with a bottom plate 5A made of a thick steel plate or the like extending in the front and rear directions, and standing on the bottom plate 5A, with a predetermined interval in the left and right directions. The left and right center beams 5B extending in the rear direction, the left and right center beams 5B being spaced apart from each other and extending in the front and rear directions, the left side frame 5C and the right side frame 5D, and the bottom plate 5A Each of the center beams 5B extends leftward and rightward, and is provided between the bottom plate 5A and the side frames 5C, 5D, and a plurality of extended beams 5E that support the left and right side frames 5C, 5D at the front ends thereof. The plurality of undercovers 5F are roughly configured. The working device 4 is attached to the front side of each center beam 5B so as to be able to move up and down.

  Further, the revolving frame 5 is provided with a mounting bracket 5G that is located at the left rear portion and extends in the front and rear directions, and the mounting bracket 5G attaches the lower side of the first heat exchanger assembly 10 described later. Is. The front and rear ends of the mounting bracket 5G are fixed to the overhanging beam 5E using welding means or the like.

  Reference numeral 6 denotes a cab (see FIGS. 1 and 2) mounted on the left front side of the revolving frame 5. The cab 6 is mounted by an operator, and a driver's seat on which the operator sits, various operation levers, An indoor unit or the like of an air conditioner (none of which is shown) is provided.

  Reference numeral 7 denotes a counterweight attached to the rear end portion of the revolving frame 5. The counterweight 7 balances the weight with the work device 4 and is formed as a heavy object. Further, the counterweight 7 is disposed close to the turning center of the upper swing body 3 in order to form the upper swing body 3 in a compact manner. Here, since the counterweight 7 balances the weight with the work device 4, it is necessary to increase the weight by the amount close to the turning center, and a large installation space is required.

  Therefore, as shown in FIG. 5, the counterweight 7 has a front surface portion 7A that is recessed in a trapezoidal shape on the rear side by pushing the left and right side portions toward the front side, and is formed in a crescent shape as a whole. Has been. As a result, the counterweight 7 secures an installation space for an engine 8 and a first heat exchanger assembly 10 described later while obtaining a large weight.

  Reference numeral 8 denotes an engine as a prime mover provided on the revolving frame 5. The engine 8 is mounted in a horizontally placed state extending in the left and right directions, and includes, for example, a supercharger (not shown) that increases the flow rate of intake air. Further, a cooling fan 8A is provided on the left side of the engine 8, and the cooling fan 8A is rotationally driven to circulate cooling air from an air inlet 19F of a building cover 19 described later to an air outlet 19G. Further, a hydraulic pump 9 is attached to the right side of the engine 8 to discharge hydraulic oil as pressure oil by being driven by the engine 8.

  Reference numeral 10 denotes a first heat exchanger assembly as a heat exchanger disposed on the left side in the building cover 19 so as to face the cooling fan 8A of the engine 8. As shown in FIG. 6, the first heat exchanger assembly 10 includes a radiator 11 that cools the engine 8 and cools the coolant that has risen in temperature, an oil cooler 12 that cools the hydraulic oil, and an excess of the engine 8. The intercooler 13 cools the intake air supplied from the feeder.

  Here, the radiator 11, the oil cooler 12, and the intercooler 13 are arranged side by side in the front and rear directions so as to be parallel to the flow direction of the cooling air generated by the cooling fan 8A. The first heat exchanger assembly 10 has an upper side attached to a mounting bracket 19H of a building cover 19 described later by bolts 10A, and a lower side attached to the mounting bracket 5G of the swivel frame 5 by bolts 10A.

  Reference numeral 14 denotes a second heat exchanger assembly as a device provided facing the first heat exchanger assembly 10 and the front and rear directions in the flow direction of the cooling air. The second heat exchanger assembly 14 forms another heat exchanger arranged separately from the first heat exchanger assembly 10, and includes a fuel cooler 15 that cools the fuel supplied to the engine 8, and A condenser 16 that constitutes a part of the outdoor unit of the air conditioner and releases heat of the refrigerant, and a mounting bracket 17 that attaches the fuel cooler 15 and the condenser 16 to the building cover 19 are roughly configured. Further, in the second heat exchanger assembly 14, the fuel cooler 15 and the condenser 16 are arranged in parallel with the flow direction of the cooling air in substantially the same manner as the radiator 11, the oil cooler 12, and the intercooler 13. . Thereby, a space 18 is formed between the first heat exchanger assembly 10 and the second heat exchanger assembly 14.

  Here, the mounting bracket 17 constituting the second heat exchanger assembly 14 forms a space 18 between the first heat exchanger assembly 10 and the fuel cooler 15 and the condenser 16 above and below. It is arranged at a substantially intermediate height position in the direction. The mounting bracket 17 includes a front bracket 17A for attaching the fuel cooler 15 to the front plate 19C of the building cover 19, a rear bracket 17B for attaching the capacitor 16 to the rear plate 19D of the building cover 19, and the fuel cooler 15 and the capacitor 16. And a connecting plate 17C for connecting the two. The front bracket 17A, the rear bracket 17B, and the connecting plate 17C are appropriately attached to the building cover 19, the fuel cooler 15, and the capacitor 16 using bolts 17D.

  Also, the brackets 17A and 17B are provided with hinge portions 17A1 and 17B1, so that the brackets 17A and 17B rotate the fuel cooler 15 and the condenser 16 in the horizontal direction around the hinge portions 17A1 and 17B1. Can move and open. As a result, the mounting bracket 17 normally fixes the fuel cooler 15 and the capacitor 16 connected by the connecting plate 17C. On the other hand, when the cleaning operation of the first heat exchanger assembly 10 is performed, the fuel cooler 15 or the condenser 16 is removed from the connecting plate 17C, and the fuel cooler 15 and the condenser 16 are moved from the central portion so as to be opened. It is possible to expose the radiator 11 and the like of the first heat exchanger assembly 10 so as to be easily removed.

  Further, the second heat exchanger assembly 14 becomes an obstacle to the cooling air flowing toward the first heat exchanger assembly 10. For this reason, it is difficult for the cooling air to be supplied to the space 18 between the first heat exchanger assembly 10 and the second heat exchanger assembly 14. Moreover, even if cooling air is supplied to the space 18, the cooling air passes through the fuel cooler 15 and the condenser 16 and rises in temperature.

  A building cover 19 is provided between the cab 6 and the counterweight 7 and provided on the revolving frame 5. The building cover 19 accommodates an engine 8, a radiator 11, an oil cooler 12, a condenser 16 and the like which will be described later in cooperation with the turning frame 5.

  Here, as shown in FIGS. 3 to 6, the building cover 19 includes a left side plate 19A that rises along the left side frame 5C of the revolving frame 5, a right side plate 19B that rises along the right side frame 5D, A front plate 19C provided between the side plates 19A and 19B located on the front side, a rear plate 19D provided on the rear side and provided between the side plates 19A and 19B, The side plates 19A and 19B, the front plate 19C, and the upper plate 19E provided so as to cover the upper side of the rear plate 19D are formed in a box shape. The left and right side plates 19A, 19B and a part or most of the top plate 19E are formed to be openable and closable for maintenance of the engine 8 and the like.

  Further, as shown in FIGS. 3 and 5, the rear plate 19D of the building cover 19 faces the front surface portion 7A of the counterweight 7 that is recessed in a trapezoidal shape, and has a central flat surface 19D1, a left inclined surface 19D2, and a right inclined surface 19D3. It protrudes in a trapezoidal shape toward the rear side. A gap 20 is formed between the rear plate 19D of the building cover 19 and the front portion 7A of the counterweight 7 in order to avoid interference between the two, and this gap 20 provides cooling air to the additional inlet 21 described later. Used as a supply passage.

  On the other hand, a plurality of air inlets 19F through which cooling air flows are provided at the upper position of the left side plate 19A of the building cover 19 and the left side position of the upper surface plate 19E. In addition, a plurality of air outlets 19G through which the cooling air whose temperature has risen flows out are provided on the right side of the right side plate 19B and the upper surface plate 19E. Here, the air inlet 19F is restricted by its position, size, and the like when both the left and right sides of the counterweight 7 are pushed forward. In relation to this, an additional inlet 21 described later is provided in the rear plate 19D.

  Further, a mounting bracket 19H extending in the front and rear directions is provided on the left side of the upper surface plate 19E of the building cover 19, and the mounting bracket 19H is for mounting the upper side of the first heat exchanger assembly 10. .

  Next, 21 shows the additional inflow port by this Embodiment provided in the rear surface board 19D of the building cover 19. FIG. The additional inlet 21 is provided separately from the air inlet 19F of the building cover 19. That is, the additional inflow port 21 is provided on the rear plate of the building cover 19 in order to supply cooling air from the outside to the space 18 between the first heat exchanger assembly 10 and the second heat exchanger assembly 14. A rectangular opening that is long in the upward and downward directions is provided at the left end of the central flat surface 19D1 constituting 19D.

  The additional inlet 21 uses the gap 20 between the rear plate 19D of the building cover 19 and the front portion 7A of the counterweight 7 as a passage, and externally cooled air is used as cooling air through the gap 20. This is supplied to the space 18 in the building cover 19. Moreover, the cooling air flowing into the space 18 from the additional inlet 21 is obstructed by the second heat exchanger assembly 14 in the heat exchanging portion of the first heat exchanger assembly 10 and is difficult to hit the cooling air. Therefore, the cooling air is uniformly supplied to the radiator 11, the oil cooler 12 and the intercooler 13 constituting the first heat exchanger assembly 10. Can do.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, an operation when the excavator 1 is operated to perform excavation work and the like will be described.

  First, the operator gets on the cab 6 and sits on the driver's seat. By operating the operating lever in this state, the lower traveling body 2 can be driven to move the hydraulic excavator 1 forward or backward. Further, the operator seated in the driver's seat can perform the excavation work of earth and sand, etc. by operating the operation lever for work to move the working device 4 up and down.

  When the hydraulic excavator 1 is operating in this way, the cooling fan 8A of the engine 8 is driven to rotate, air is introduced from the air inlet 19F of the building cover 19, and this air is used as cooling air for the second heat exchanger. By supplying the fuel cooler 15 and the condenser 16 of the assembly 14 to the radiator 11, the oil cooler 12, and the intercooler 13 of the first heat exchanger assembly 10, each fluid to be cooled is cooled. Can do. And the cooling air which passed these can flow out outside from the air outlet 19G through the circumference | surroundings of the engine 8, the hydraulic pump 9, etc. FIG.

  Here, the cooling air flowing through the building cover 19 from the air inlet 19F is blocked by the second heat exchanger assembly 14, and therefore the downstream side of the second heat exchanger assembly 14. Only a small amount of cooling air flows in the upper and lower intermediate portions of the first heat exchanger assembly 10 as compared with the surroundings.

  Therefore, in the present embodiment, an additional inlet for supplying cooling air to the space 18 between the first heat exchanger assembly 10 and the second heat exchanger assembly 14 in the building cover 19 from the outside. 21 is provided. As a result, even if the second heat exchanger assembly 14 becomes an obstacle to the flow of the cooling air and the cooling air does not flow to a part of the first heat exchanger assembly 10, an additional inlet is provided in this portion. The cooling air can be concentrated from 21.

  Thus, according to the present embodiment, even when the second heat exchanger assembly 14 becomes an obstacle and the first heat exchanger assembly 10 has a place where the cooling air does not hit, the additional inlet port is formed. 21 can supply cooling air to this place without being obstructed by the fuel cooler 15, the condenser 16, and the mounting bracket 17 constituting the second heat exchanger assembly 14. Further, the additional inlet 21 can efficiently supply the cooling air to the first heat exchanger assembly 10 even when the counterweight 7 restricts the position and size of the air inlet 19F. it can.

  Further, even when the second heat exchanger assembly 14 is arranged upstream of the first heat exchanger assembly 10, the additional inlet 21 is cooled by the fuel cooler 15 and the condenser 16 and is not cooled. Wind can be supplied to the radiator 11, the oil cooler 12, and the intercooler 13, and the cooling efficiency of these can be improved.

  As a result, the additional inlet 21 can supply cooling air to the entire surface of the radiator 11, the oil cooler 12, and the intercooler 13 constituting the first heat exchanger assembly 10, so that the radiator 11, the oil The cooling efficiency of the cooler 12 and the intercooler 13 can be improved.

  Moreover, since the additional inflow port 21 is provided in the rear plate 19D of the building cover 19 that faces the counterweight 7, it can be covered with the counterweight 7, and noise leakage can be suppressed. In addition, the appearance can be improved.

  Furthermore, since the radiator 11, the oil cooler 12, and the intercooler 13 are arranged in parallel with the flow direction of the cooling air, all of the radiator 11, the oil cooler 12, and the intercooler 13 are exposed to the outside, and cleaning work, etc. Can be easily performed.

  In the embodiment, as devices that obstruct the flow of the cooling air, the fuel cooler 15 that cools the fuel, the condenser 16 that releases the heat of the refrigerant, and the mounting bracket 17 that attaches the fuel cooler 15 and the condenser 16 to the building cover 19. The second heat exchanger assembly 14 made of is described as an example.

  However, the present invention is not limited to this. For example, as in the first modification shown in FIG. 8, for example, an air cleaner 31 that cleans intake air, a tank 32 that stores liquid such as engine cooling water, washer fluid, and refrigerant, a battery When 33 etc. are arrange | positioned in the position used as the obstruction | occlusion of the flow of cooling air, it is good also as a structure which uses either of these as equipment. Further, as in the first modification, the additional inlet 34 may be provided on the front plate 19C of the building cover 19.

  In the embodiment, the first heat exchanger assembly 10 has been described by taking as an example the case where the radiator 11, the oil cooler 12, and the intercooler 13 are arranged in parallel with respect to the flow direction of the cooling air. However, the present invention is not limited to this. For example, in the case of the engine 8 that does not include a supercharger as in the second modification shown in FIG. 9, the intercooler 13 is eliminated, and the radiator 11 'and the oil cooler are eliminated. The first heat exchanger assembly 10 'may be constituted by 12'. Moreover, it is good also as a structure arrange | positioned in series so that the radiator 11, the oil cooler 12, etc. may overlap with respect to the flow direction of cooling air. This configuration can be applied to the second heat exchanger assembly 14 as well.

  In the embodiment, the mounting bracket 17 includes a front bracket 17A for attaching the fuel cooler 15 to the front plate 19C of the building cover 19, a rear bracket 17B for attaching the capacitor 16 to the rear plate 19D of the building cover 19, and a fuel cooler. 15 and a connecting plate 17C for connecting the capacitor 16, and the brackets 17A and 17B are provided with a fuel cooler 15 and hinge portions 17A1 and 17B1 for rotating the capacitor 16 in the horizontal direction. The case where the capacitor 16 and the capacitor 16 are supported to be openable and closable has been described as an example.

  However, the present invention is not limited to this. For example, as in the third modification shown in FIG. 10, the mounting bracket 41 includes a front bracket 41A, a rear bracket 41B, and a connecting plate 41C made of a single plate. The fuel cooler 15 and the capacitor 16 may be fixedly attached to the building cover 19 side.

  Further, in the embodiment, the case where the engine 8 is provided with the cooling fan 8A has been described as an example. However, the present invention is not limited to this. For example, a cooling fan may be provided separately from the engine and driven to rotate using an electric motor, a hydraulic motor, or the like.

  Furthermore, in the embodiment, the crawler hydraulic excavator 1 is described as an example of the construction machine. However, the present invention is not limited to this, and may be applied to, for example, a hydraulic excavator provided with a wheel-type lower traveling body. Further, it can be widely applied to other construction machines such as a hydraulic crane, a wheel loader, and a tractor.

1 is a front view showing a hydraulic excavator according to an embodiment of the present invention. It is the external appearance perspective view which looked at the hydraulic shovel shown in FIG. 1 from the left rear side. It is a perspective view of the principal part expansion which shows the rear side of an upper revolving body in the state which removed the counterweight. It is an expanded sectional view of the upper revolving structure seen from the arrow IV-IV direction in FIG. It is sectional drawing which looked at the rear side of the upper revolving body from the arrow VV direction in FIG. It is an expanded sectional view which looked at the 1st heat exchanger assembly, the 2nd heat exchanger assembly, the building cover, etc. from the arrow VI-VI direction in FIG. It is an external appearance perspective view which expands and shows a 2nd heat exchanger assembly. It is the expanded sectional view which looked at the upper turning body by the 1st modification of this invention from the same position as FIG. It is an expanded sectional view showing the 1st heat exchanger assembly by the 2nd modification of the present invention as the 2nd heat exchanger assembly etc. It is an external appearance perspective view which shows the 2nd heat exchanger assembly by the 3rd modification of this invention.

Explanation of symbols

1 Excavator (construction machine)
DESCRIPTION OF SYMBOLS 3 Upper revolving body 5 Revolving frame 7 Counterweight 7A Front part 8 Engine 8A Cooling fan 10,10 '1st heat exchanger assembly (heat exchanger)
11, 11 ′ Radiator 12, 12 ′ Oil cooler 13 Intercooler 14 Second heat exchanger assembly (equipment)
15 Fuel cooler (other heat exchanger)
16 condenser (other heat exchanger)
17, 41 Mounting bracket 18 Space 19 Building cover 19A Left side plate 19B Right side plate 19C Front plate 19D Rear plate 19E Top plate 19F Air inlet 19G Air outlet 21, 34 Additional inlet 31 Air cleaner (equipment)
32 Tank (equipment)
33 Battery (equipment)

Claims (4)

  1. A frame that forms a support structure, a prime mover provided on the frame, a cooling fan that rotates using the prime mover as a power source, and heat exchange of a fluid to be cooled by being supplied with cooling air from the cooling fan A heat exchanger to be performed, devices that face the heat exchanger forward and rearward with respect to the flow direction of the cooling air by the cooling fan, obstruct the flow of the cooling air, the motor, the cooling In a construction machine comprising an air inlet for covering a fan, a heat exchanger and equipment and circulating cooling air and a building cover on which an air outlet is formed,
    In the building cover, an additional inlet for allowing cooling air to flow from the outside into a space formed between the heat exchanger and the devices in the cooling air flow direction is provided separately from the air inlet. A construction machine characterized by having a configuration to be provided.
  2.   The frame is provided with a counterweight located on a rear surface side of the building cover, and the additional inlet is provided on a rear surface of the building cover facing the counterweight at a position corresponding to the space. Item 2. The construction machine according to Item 1.
  3.   The heat exchanger includes a radiator and an oil cooler arranged in parallel with respect to the flow direction of the cooling air, and the devices are other heat exchangers arranged separately from the heat exchanger. The construction machine according to claim 1 or 2.
  4.   The construction machine according to claim 1 or 2, wherein the equipment is one of an air cleaner, a battery, and a tank for storing various liquids.
JP2005040945A 2005-02-17 2005-02-17 Construction machine Pending JP2006224812A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008240678A (en) * 2007-03-28 2008-10-09 Komatsu Ltd Construction vehicle
WO2009101935A1 (en) 2008-02-15 2009-08-20 Hitachi Construction Machinery Co., Ltd. Construction machine
JP2010174854A (en) * 2009-02-02 2010-08-12 Yanmar Co Ltd Agricultural tractor
EP2311681A1 (en) 2009-10-16 2011-04-20 Hitachi Construction Machinery Co., Ltd. Construction machine
JP2012144955A (en) * 2011-01-14 2012-08-02 Hitachi Constr Mach Co Ltd Construction machine
WO2016017233A1 (en) * 2014-07-28 2016-02-04 日立建機株式会社 Hybrid-type work machine

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008240678A (en) * 2007-03-28 2008-10-09 Komatsu Ltd Construction vehicle
WO2009101935A1 (en) 2008-02-15 2009-08-20 Hitachi Construction Machinery Co., Ltd. Construction machine
US8162087B2 (en) 2008-02-15 2012-04-24 Hitachi Construction Machinery Co., Ltd. Construction machine
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