JP4763561B2 - Construction machinery - Google Patents

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 roughly constituted by a working device.

  Further, the upper swing body is a swing frame forming a support structure, a cab provided on the front side of the swing frame, on which an operator gets on, an engine mounted on the rear side of the swing frame and driving a hydraulic pump, A cooling fan that is rotationally driven by the engine, a heat exchanger such as a radiator, an oil cooler, and an intercooler provided to face the cooling fan, and the engine, the cooling fan, and each heat exchanger so as to cover the heat exchanger It is generally constituted by a building cover provided on the revolving frame.

  Further, a rectangular frame-like frame body is attached to the revolving frame side, and a radiator, an oil cooler, an intercooler, and the like are detachably attached to the frame body (see, for example, Patent Document 1 and Patent Document 2).

JP-A-11-123940 JP 2003-136972 A

  By the way, in the invention of each patent document mentioned above, after attaching a frame to a revolving frame, it is set as the structure which attaches heat exchangers, such as a radiator, an oil cooler, and an intercooler, to this frame. For this reason, when assembling a hydraulic excavator, a radiator, an oil cooler, an intercooler, etc. must be mounted one by one on the assembly line, resulting in a problem that assembly workability is lowered. The hydraulic excavator is also provided with a heat exchanger such as a fuel cooler for cooling the fuel and a condenser for the air conditioner. Therefore, the condenser and the fuel cooler must be mounted on the assembly line.

  Further, according to each patent document, only a plurality of heat exchangers are attached to the inside of the frame, so that a heat exchanger chamber for circulating cooling air cannot be formed. For this reason, it is necessary to prepare a partition plate separate from the frame to form the heat exchanger chamber, and there is a problem that the number of parts and the number of work steps increase.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a construction machine in which a heat exchanger can be easily attached to a vehicle body frame and assembly workability can be improved. There is.

  The construction machine according to the present invention is supplied with a vehicle body frame that forms a support structure, a prime mover provided on the vehicle body frame, a cooling fan that rotates using the prime mover as a power source, and cooling air from the cooling fan. A heat exchanger that performs heat exchange of the fluid to be cooled, and a support frame that supports the heat exchanger.

In order to solve the above-mentioned problem, the feature of the configuration adopted by the invention of claim 1 is that the body frame is located on the left and right sides of the body frame and extends in the front and rear directions. A side plate and a top plate extending horizontally between the upper ends of the side plates are provided, and a building cover is provided to cover the prime mover, the cooling fan, and the heat exchanger, and the support frame has a predetermined interval. Two side plates arranged, a connecting member that connects the upper portions of the side plates, and an inner plate that is provided on the prime mover side of the side plates and that has an opening at the portion facing the cooling fan. The upper part of the heat exchanger is provided with an upper bracket, the lower part of the heat exchanger is provided with a lower bracket, and both ends of the upper bracket and the lower bracket are respectively provided. wherein each side of the support frame Parts attached by bolts to constitute a single heat exchanger unit to be assembled in advance, when mounting the heat exchanger unit to the body frame, the vehicle body lower portion of each side plate of the support frame It is attached to the frame with bolts , the lower bracket of the heat exchanger is attached to the vehicle body frame with bolts independently of the support frame, and the heat exchanger can be detached from the support frame separately. In the state where the heat exchanger unit is attached to the vehicle body frame, the partition plates as the two side plates of the support frame are close to the side plates and the top plate of the building cover. The partition plate, the side plate, and the top plate define a heat exchanger chamber in the support frame for circulating cooling air toward the heat exchanger. There to be configured so that.

According to a second aspect of the present invention, a shroud is provided so as to surround the cooling fan and an opening of the inner surface plate constituting the support frame is connected to the shroud.

According to the invention of claim 3 , the inner surface plate of the support frame body surrounds the upper plate portion that surrounds the upper portion of the cooling fan and the lower portion of the cooling fan, and the upper plate portion or the side plate. This is because it is constituted by a lower plate portion that is detachably provided.

According to a fourth aspect of the present invention, the heat exchanger comprises an assembly of a radiator and an oil cooler arranged in parallel with the flow direction of the cooling air, and the position of the assembly overlaps with the flow direction of the cooling air. There is a configuration in which another heat exchanger is arranged.

According to the first aspect of the present invention, on the body frame, the side plate located on both the left and right sides of the body frame and extending in the front and rear directions, and the upper end portion of each side plate are horizontally disposed. A building cover that covers the prime mover, the cooling fan, and the heat exchanger, and the support frame includes two side plates disposed at a predetermined interval, and an upper portion of each side plate. The connecting member to be connected and an inner surface plate provided on the prime mover side of each side plate and having an opening at a portion facing the cooling fan, and an upper bracket is provided on the upper portion of the heat exchanger, A lower bracket is provided at a lower portion of the heat exchanger, and both end portions of the upper bracket and the lower bracket are respectively attached to the side portions of the support frame by bolts, and are assembled in advance. single heat exchanger Yoo for Since forming the Tsu bets, the heat exchanger unit can be assembled efficiently in a separate work site and construction machinery assembly line. Thereby, the pre-assembled heat exchanger unit can be easily attached to the vehicle body frame. For example, when a plurality of heat exchangers are required, the workability of attaching each heat exchanger is improved. be able to. Moreover, in the heat exchanger unit that can be assembled at a wide work site, the heat exchangers can be assembled densely, so that the construction machine can be miniaturized .

According to the first aspect of the present invention, the both ends of the upper bracket and the lower bracket of the heat exchanger are connected to the side portions of the support frame with bolts, so that the support frame and the heat can be easily heated. The heat exchanger unit can be easily assembled by integrating the exchanger. And when attaching a heat exchanger unit to the body frame, the lower part of each side plate of the support frame is attached to the body frame with bolts, and the lower bracket of the heat exchanger is attached to the support frame. Are independently attached to the body frame with bolts, and the heat exchanger can be detached from the support frame. Therefore, the heat exchanger can be detached from the support frame body by removing the lower part of the heat exchanger from the vehicle body frame, and workability such as maintenance work can be improved.

According to invention of Claim 1 , a support frame can be covered on both sides of a heat exchanger with the two side plates connected with the connection member. Further, the inner surface plate has a cooling fan facing the opening, so that when the cooling fan is driven, the cooling air can be circulated through the passage covered with the connecting member and each side plate.
In addition, the support frame of the heat exchanger unit can define a heat exchanger chamber in which cooling air is circulated toward the heat exchanger in cooperation with the building cover. Thereby, the cooling air sucked into the heat exchanger chamber can be efficiently distributed toward the heat exchanger. That is, the partition plates as the two side plates of the support frame body of the heat exchanger unit, the side plates and the top plate of the building cover have the heat exchanger chamber in which the cooling air is circulated toward the heat exchanger. It can be defined in the body. Thereby, the cooling air sucked into the heat exchanger chamber can be efficiently distributed toward the heat exchanger.

According to the invention of claim 2 , the shroud surrounding the periphery of the cooling fan can guide the cooling air generated by the cooling fan to adjust the flow. And by connecting the opening of the inner surface plate to the shroud, the cooling air from the cooling fan can be efficiently passed through the heat exchanger, and the cooling efficiency can be improved.

According to the invention of claim 3 , the inner surface plate of the support frame is constituted by an upper plate portion surrounding the upper portion of the cooling fan and a lower plate portion surrounding the lower portion of the cooling fan. Thereby, when the lower plate part is removed, the lower side of the upper plate part can be opened. Therefore, when attaching the heat exchanger unit to the vehicle body frame, the lower plate portion is removed. Next, in a state where the heat exchanger unit is arranged so that the upper plate portion is positioned above the cooling fan, the heat exchanger unit can be attached to the vehicle body frame by simply lowering the heat exchanger unit directly below. . When the heat exchanger unit is attached to the vehicle body frame, the lower part of the cooling fan that has been opened can be surrounded by attaching the lower part to the upper part or the side part. Can surround the circumference.

As a result, the heat exchanger unit can be attached to a predetermined position of the vehicle body frame by only straight down. Thereby, even when there is an obstacle around the mounting position, for example, as in a small construction machine, the heat exchanger unit can be easily mounted , and the assembly workability can be improved .

According to the invention of claim 4 , the radiator and oil cooler assembly arranged in parallel with the flow direction of the cooling air can efficiently apply the cooling air and improve the cooling efficiency. Moreover, since another heat exchanger can be arrange | positioned in the space of the upstream of an assembly, a construction machine can be reduced in size.

  Hereinafter, as a construction machine according to an embodiment of the present invention, a hydraulic excavator provided with a heat exchanger such as a radiator or an oil cooler will be described as an example, and will be described in detail with reference to the accompanying drawings.

  1 to 15 show a first embodiment of the present invention. In the first embodiment, a case where the present invention is applied to a standard type hydraulic excavator in which a counterweight protrudes from a lower traveling body will be described as an example.

  In FIG. 1, reference numeral 1 denotes a crawler-type hydraulic excavator as a construction machine. And a work device 27 described later provided on the upper swing body 3.

  Reference numeral 4 denotes a revolving frame used as a body frame constituting the upper revolving structure 3, and the revolving frame 4 is formed as a support structure. The swivel frame 4 is, as shown in FIGS. 2 and 3, a bottom plate 4A made of a thick steel plate or the like extending in the front and rear directions, and standing on the bottom plate 4A, with a predetermined interval in the left and right directions. Left and right center beams 4B extending in the front and rear directions, left and right center beams 4B being spaced at the left and right, and extending in the front and rear directions, the left side frame 4C and the right side frame 4D, Between the bottom plate 4A and the side frames 4C and 4D, the bottom plate 4A and the center beam 4B project in the left and right directions, and support the left and right side frames 4C and 4D at the front ends thereof. And a plurality of undercovers 4F provided on the main body. A working device 27 is attached to the front side of each center beam 4B so as to move up and down.

  Further, the revolving frame 4 is provided with a mounting bracket 4G located at the left rear portion and extending in the front and rear directions, and the mounting bracket 4G constitutes a heat exchanger unit 11 to be described later, as shown in FIG. The lower bracket 19 and the like of the heat exchanger assembly 14 to be attached are attached. The mounting bracket 4G is made of, for example, a steel material having a U-shaped cross section, and its end is fixed to the overhanging beam 4E positioned at the front and rear using welding means or the like.

  Reference numeral 5 denotes a cab (see FIG. 1) mounted on the left front side of the revolving frame 4. The cab 5 is used by an operator. Further, inside the cab 5, a driver's seat on which an operator is seated, various operation levers, an indoor unit of an air conditioner, and the like (all not shown) are arranged.

  Reference numeral 6 denotes an engine as a prime mover provided on the rear side of the turning frame 4 (see FIG. 4). The engine 6 is mounted in a horizontal state extending in the left and right directions, and includes, for example, a supercharger (not shown) that increases the flow rate of intake air. The engine 6 has a water jacket (not shown) through which engine cooling water circulates, and the water jacket is connected to a radiator 15 to be described later that releases heat of the cooling water. Further, the supercharger is connected to an intercooler 17 (to be described later) that releases heat of the compressed intake air, and is connected to the intake side of the engine 6 through the intercooler 17.

  Reference numeral 7 denotes a cooling fan provided on the left side of the engine 6, and the cooling fan 7 is rotationally driven by the engine 6. The cooling fan 7 is rotationally driven by the engine 6 to allow outside air to flow as cooling air from an inlet 10F of a building cover 10 described later, and from the outlet 10G to the outside through the heat exchanger chamber 13 and the engine chamber 26. Spill into.

  Reference numeral 8 denotes a circular shroud provided around the cooling fan 7. The shroud 8 is attached to the engine 6 using a plurality of, for example, three brackets 8A. The shroud 8 is connected to an opening 12D1 of an inner surface plate 12D constituting a support frame 12 described later via a rubber cylinder (not shown). The shroud 8 guides the cooling air generated by the cooling fan 7 and arranges the flow, so that the cooling air from the cooling fan 7 can be efficiently passed by the radiator 15 or the like.

  Reference numeral 9 denotes a hydraulic pump attached to the right side of the engine 6. The hydraulic pump 9 is driven by the engine 6 to discharge hydraulic oil as pressure oil toward the work device 27 and the like. Further, the hydraulic oil returned from the working device 27 and the like can be cooled by circulating an oil cooler 16 described later.

  A building cover 10 is provided on the revolving frame 4 between the cab 5 and a counterweight 24 described later. As shown in FIGS. 1 and 4, the building cover 10 includes left and right side plates 10A and 10B which are located on both left and right sides of the revolving frame 4 and extend in the front and rear directions, and the side plates 10A. , 10B and a top surface plate 10C extending in the horizontal direction between the upper end portions, and an opening 10D for maintenance is formed in the top surface plate 10C. An engine cover 10E is provided on the upper surface plate 10C so as to cover the opening 10D. Further, the left side plate 10A of the building cover 10 is formed with an inlet 10F through which cooling air to be supplied to the radiator 15 and the like is introduced, and the right side plate 10B is a flow through which cooling air having passed through the engine 6 and the like flows out. An outlet 10G is formed.

  Here, the left side plate 10A constituting the building cover 10 directly covers the left side (upstream side) of the support frame 12 of the heat exchanger unit 11 described later, and the top plate 10C covers the upper side of the support frame 12. It covers directly. As a result, the left side plate 10A and the top plate 10C of the building cover 10 cooperate with the support frame 12 and a heat exchanger chamber 13 described later in which cooling air flows through the support frame 12 toward the radiator 15 and the like. Is defined.

  Next, the heat exchanger unit according to the first embodiment for cooling various fluids such as cooling water of the engine 6, hydraulic oil, intake air taken in by the engine 6, fuel, and refrigerant of the air conditioner with cooling air will be described. This will be described with reference to FIGS.

  Reference numeral 11 denotes a single heat exchanger unit located in the left side of the engine 6 and provided in the building cover 10. The heat exchanger unit 11 can attach a plurality of heat exchangers to the swivel frame 4 at a time by collecting most heat exchangers mounted on the upper swing body 3 of the excavator 1. It is configured as a single unit. For this reason, the assembly work of the heat exchanger unit 11 can be efficiently performed at a wide work site that is separate from the assembly line of the excavator 1. As shown in FIGS. 4 and 5, the heat exchanger unit 11 is roughly configured by a support frame 12, a heat exchanger assembly 14, a fuel cooler 20, a condenser 21, and the like which will be described later.

  Reference numeral 12 denotes a support frame that forms a frame structure of the heat exchanger unit 11. The support frame 12 includes a radiator 15, an oil cooler 16, an intercooler 17, a fuel cooler 20, a condenser 21, and the like arranged at the left rear portion of the revolving frame 4. It is to be established. As shown in FIGS. 6, 7, and 8, the support frame 12 includes front and rear partition plates 12 </ b> A as side plates facing in parallel at a predetermined interval in the front and rear directions of the upper swing body 3. 12B, a long box-like connecting member 12C extending in the front and rear directions so as to connect the upper portions of the partition plates 12A and 12B and covering the upper portion of the heat exchanger assembly 14, and the partition plates 12A and 12B The inner surface plate 12D and the like are integrally mounted on the downstream side (engine 6 side) of the connecting member 12C.

  Further, a reinforcing member 12E for increasing the strength while allowing the cooling air to flow is attached to the upstream side of the support frame 12 over the partition plates 12A and 12B. Further, an attachment plate 12F (only the front partition plate 12A side is shown) for attaching a lower bracket 19 to be described later is provided below each partition plate 12A, 12B. Further, as shown in FIG. 4, a circulation preventing member 12G is installed on the upper side of the connecting member 12C to fill the gap between the building cover 10 and the engine cover 10E and prevent the cooling air from circulating.

  On the other hand, on the opposite surface side of the front partition plate 12A, a front support plate 12H that supports the entire fuel cooler 20 and a front portion of the capacitor 21 to be described later is provided to extend to the rear side, and the opposite surface of the rear partition plate 12B. A rear support plate 12J that supports the rear portion of the capacitor 21 is provided on the side so as to correspond to the front support plate 12H.

  Here, as shown in FIGS. 12 and 13, the front partition plate 12A is arranged to extend in the left and right directions along the overhanging beam 4E to which the front end of the mounting bracket 4G of the swivel frame 4 is attached. The lower part can be bolted to the overhanging beam 4E. Further, the rear partition plate 12B is arranged to extend to the left and right so as to extend along the overhanging beam 4E to which the rear end portion of the mounting bracket 4G is attached. It can be fixed using 12K (see FIG. 12).

  Then, as shown in FIG. 4, each partition plate 12A, 12B cooperates with the left side plate 10A, the top plate 10C, etc. by partitioning the space in the vicinity of the left side plate 10A, the top plate 10C of the building cover 10. A heat exchanger chamber 13 can be defined in the support frame 12. The heat exchanger chamber 13 circulates the cooling air flowing from the inlet 10F of the building cover 10 toward the radiator 15, the oil cooler 16, the intercooler 17 and the like that constitute the heat exchanger assembly 14.

  Further, the front partition plate 12A forms a partition plate that defines the heat exchanger chamber 13, and other chambers adjacent to the front side of the heat exchanger chamber 13, such as a control valve chamber and a tool storage chamber (both not shown). Z)) can also serve as a partition plate. Thereby, the front side partition plate 12A can also be used as a partition between the heat exchanger chamber 13 and other adjacent chambers, and the number of parts can be reduced.

  Reference numeral 14 denotes a heat exchanger assembly as a heat exchanger provided in the support frame 12. The heat exchanger assembly 14 is configured by connecting, with brackets 18 and 19, a radiator 15, an oil cooler 16, and an intercooler 17, which will be described later, arranged in parallel with the cooling air flow direction.

  Reference numeral 15 denotes a radiator as a heat exchanger provided in the support frame 12. The radiator 15 cools the cooling water whose temperature has been increased by cooling the engine 6. Further, as shown in FIGS. 9 and 10, the radiator 15 is roughly configured by an upper tank 15 </ b> A, a lower tank 15 </ b> B, and a heat radiating portion 15 </ b> C, and each tank 15 </ b> A, 15 </ b> B is connected to a water jacket of the engine 6. On the other hand, the radiator 15 has a front surface (upstream side) of the upper tank 15A attached to an upper bracket 18 to be described later in a vibration-proof state, and a front surface of the lower tank 15B is attached to the lower bracket 19 via a vibration-proof member 15D. Installed in.

  Reference numeral 16 denotes an oil cooler as a heat exchanger arranged in parallel with the radiator 15, and the oil cooler 16 cools hydraulic oil. Further, as shown in FIGS. 9 and 11, the oil cooler 16 is roughly constituted by an upper tank 16A, a lower tank 16B, and a heat radiating portion 16C, and hydraulic oil pipes (not shown) are connected to the tanks 16A and 16B, respectively. The On the other hand, in the oil cooler 16, almost the same as the radiator 15, an upper tank 16 </ b> A is attached to an upper bracket 18 described later, and a lower tank 16 </ b> B is attached to a lower bracket 19. In the embodiment, the oil cooler 16 is provided on the front side in the front and rear directions (cab 5 side) with respect to the radiator 15.

  Reference numeral 17 denotes an intercooler as a heat exchanger arranged in parallel with the radiator 15. The intercooler 17 cools intake air supplied from the supercharger of the engine 6. 9 and 10, the intercooler 17 is roughly constituted by an upper tank 17A, a lower tank 17B, and a heat radiating portion 17C. The upper tank 17A is connected to the supercharger side, and the lower tank 17B is connected to the engine 6. Connected to the intake side. On the other hand, in the intercooler 17, almost the same as the radiator 15, the upper tank 17A is attached to the upper bracket 18 in a vibration-proof state, and the lower tank 17B is attached to the lower bracket 19 in a vibration-proof state via a vibration-proof member 17D. ing. In the embodiment, the intercooler 17 is provided on the rear side (counter weight 24 side) in the front and rear directions with respect to the radiator 15.

  Here, the radiator 15, the oil cooler 16, and the intercooler 17 constituting the heat exchanger assembly 14 are flow directions of cooling air generated by the cooling fan 7 so that, for example, cooling efficiency is improved and cleaning work is facilitated. Are arranged side by side in the front and rear direction of the upper swing body 3 so as to be in parallel with each other.

  Reference numeral 18 denotes an upper bracket that extends in the horizontal direction above the radiator 15, the oil cooler 16, and the intercooler 17. The upper bracket 18 is made of, for example, an L-shaped steel material whose upper side is bent. The upper portion of the radiator 15, the oil cooler 16, and the intercooler 17 is bolted to the upper bracket 18. The upper bracket 18 is fixed to the radiator 15 and the oil cooler by fixing the mounting portions 18A and 18A provided at both ends in the length direction to the upper portions of the partition plates 12A and 12B of the support frame 12 using bolts 18B. 16, The upper part of the intercooler 17 is integrally attached to the support frame 12 (see FIG. 5).

  Reference numeral 19 denotes a lower bracket that extends in the horizontal direction below the radiator 15, the oil cooler 16, and the intercooler 17. The lower bracket 19 is formed of, for example, an L-shaped steel material whose lower side is bent, and is attached to the revolving frame 4. Further, as shown in FIGS. 10 and 11, lower portions of the radiator 15, the oil cooler 16, and the intercooler 17 are attached to the lower bracket 19, respectively.

  The lower bracket 19 is bolted to the mounting plates 12F of the support frame 12 at both ends in the length direction. Further, when the heat exchanger unit 11 is mounted on the revolving frame 4, it is attached to the mounting bracket 4G of the revolving frame 4 separately from the support frame 12 using a plurality of bolts 14A (FIGS. 10, 11, and 11). (See FIG. 14).

  In the heat exchanger assembly 14 configured as described above, the upper portion of the radiator 15, the oil cooler 16, and the intercooler 17 is attached to the upper portion of the partition plates 12A and 12B of the support frame 12 via the upper bracket 18. The lower part is attached to the mounting bracket 4G of the revolving frame 4 via the lower bracket 19 in a state independent of the support frame 12. Thereby, the radiator 15, the oil cooler 16, and the intercooler 17 can be individually attached to and detached from the revolving frame 4, and workability such as maintenance work can be improved.

  Reference numeral 20 denotes a fuel cooler used as another heat exchanger attached to the front support plate 12H of the support frame 12. The fuel cooler 20 cools the fuel supplied to the engine 6. The fuel cooler 20 is disposed at a position overlapping the upstream side in the flow direction of the cooling air with respect to the oil cooler 16.

  Reference numeral 21 denotes a condenser used as another heat exchanger attached between the front support plate 12H and the rear support plate 12J of the support frame 12. The capacitor 21 constitutes a part of the outdoor unit of the air conditioner and releases the heat of the refrigerant. And the capacitor | condenser 21 is arrange | positioned in the position which overlaps with the radiator 15, the oil cooler 16, etc. in the upstream of the flow direction of cooling air.

  Here, since the fuel cooler 20 and the condenser 21 are disposed at a position overlapping the radiator 15 and the oil cooler 16 in the flow direction of the cooling air, the upstream space such as the radiator 15 and the oil cooler 16 is used. The heat exchanger unit 11 can be downsized and workability such as maintenance work can be improved.

  A reservoir tank 22 is located on the upstream side of the fuel cooler 20 and is attached to the front partition plate 12A of the support frame 12. The reservoir tank 22 stores engine coolant to be replenished to the radiator 15. A dust-proof net 23 covers the upstream side of the radiator 15, the oil cooler 16, and the intercooler 17. The dust-proof net 23 is detachably attached to the brackets 18 and 19.

  When the heat exchanger unit 11 configured as described above is assembled, the front partition plate 12A, the rear partition plate 12B, the connecting member 12C, the inner surface plate 12D, and the like are assembled to form the support frame 12. Further, the radiator 15, the oil cooler 16, and the intercooler 17 are arranged in parallel, and these are connected by the upper bracket 18 and the lower bracket 19 to form the heat exchanger assembly 14. The upper part of the heat exchanger assembly 14 is assembled to the support frame 12, and the fuel cooler 20 and the condenser 21 are attached to the support plates 12H and 12J. Furthermore, the single heat exchanger unit 11 can be assembled by attaching the reservoir tank 22 or the like.

  Reference numeral 24 denotes a counterweight (see FIG. 1) attached to the rear end of the revolving frame 4. The counterweight 24 balances the weight with the work device 27 and is formed as a heavy object. Further, the counterweight 24 is disposed so as to protrude rearward from the lower traveling body 2 so that a large weight for balancing the weight with the work device 27 described later can be easily secured.

  Reference numeral 25 denotes another partition plate located on the front side of the engine 6 and extending left and right in the building cover 10 (see FIG. 4). The partition plate 25 defines an engine chamber 26 that houses the engine 6, the hydraulic pump 9, and the like on the rear side of the building cover 10. Further, reference numeral 27 denotes a working device provided on the front side of the upper swing body 3 so as to be able to move up and down. This working device 27 performs excavation work of earth and sand.

  The hydraulic excavator 1 according to the first embodiment has the above-described configuration. Next, almost all heat exchangers mounted on the upper swing body 3, that is, the radiator 15, the oil cooler 16, the intercooler 17, the fuel. A procedure for attaching the cooler 20 and the condenser 21 to the revolving frame 4 side will be described.

  First, at a wide work site that is separate from the assembly line of the excavator 1, the upper bracket 18 and the lower bracket 18 are placed on the support frame 12 including the front partition plate 12A, the rear partition plate 12B, the connecting member 12C, the inner surface plate 12D, and the like. A heat exchanger assembly 14 including a radiator 15, an oil cooler 16, and an intercooler 17 connected by a side bracket 19 is attached. In addition, a fuel cooler 20 and a condenser 21 as other heat exchangers are attached to the support plates 12H and 12J so as to overlap the upstream side of the radiator 15 and the oil cooler 16 and the like, and the reservoir tank 22 and the like are attached at predetermined positions. Thus, a single heat exchanger unit 11 is assembled as shown in FIG.

  When the heat exchanger unit 11 is assembled in this way, the heat exchanger unit 11 is lifted and transported to the assembly line of the excavator 1, and the left rear portion of the swivel frame 4 as shown in FIGS. Placed on. In this placement operation, when the heat exchanger unit 11 is lowered straight to a predetermined position of the revolving frame 4, the inner surface plate 12 </ b> D of the support frame body 12 interferes with the cooling fan 7. Therefore, as shown in FIG. 14, the heat exchanger unit 11 is lowered to a position shifted to the left side that is the outside of the left and right directions so as not to interfere with the cooling fan 7 (arrow A direction). When lowered to a predetermined height, as shown in FIG. 15, the heat exchanger unit 11 is horizontally moved to the right (in the direction of arrow B) toward the cooling fan 7, and the opening 12D1 of the inner surface plate 12D is opened with the shroud 8 and the rubber cylinder. Connect through body (not shown).

  In this state, the support frame 12 fixes the lower part of each partition plate 12A, 12B to the extended beam 4E of the revolving frame 4 using each bolt 12K or the like. Further, the heat exchanger assembly 14 fixes the lower bracket 19 to the mounting bracket 4G of the swivel frame 4 using the bolts 14A independently of the partition plates 12A and 12B of the support frame 12.

  On the other hand, the heat exchanger assembly 14 can remove the bolts 14 </ b> A from the brackets 18 and 19. As described above, the heat exchanger assembly 14 can be individually detached while the support frame 12 is attached to the revolving frame 4 side.

  Next, the operation of the hydraulic excavator 1 will be described. First, the operator gets on the cab 5 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. In addition, the operator seated in the driver's seat can perform the excavation work of earth and sand by operating the operation lever for work to move the working device 27 up and down.

  When the hydraulic excavator 1 is in operation, air is introduced from the inlet 10F of the building cover 10 by the cooling fan 7 of the engine 6, and the air is used as cooling air for the radiator 15 and the oil cooler of the heat exchanger assembly 14. 16, the fluid which should be cooled can be cooled by supplying to the intercooler 17, the fuel cooler 20, and the condenser 21. Further, the cooling air that has passed through these flows through the periphery of the engine 6, the hydraulic pump 9, etc., and flows out from the outlet 10G.

  As described above, according to the first embodiment, the support frame body 12 and the heat exchanger assembly 14 are assembled in advance to form a single heat exchanger unit 11, and this assembled heat exchange is performed. The unit 11 is attached to the revolving frame 4. Therefore, the heat exchanger unit 11 can be assembled at a work site separate from the assembly line of the excavator 1.

  As a result, the heat exchanger unit 11 assembled in advance can be easily attached to the revolving frame 4 simply by performing a screw tightening operation and a piping operation, and the assembling workability can be improved. Moreover, since the heat exchanger unit 11 can be assembled separately at a wide work site, the radiator 15, the oil cooler 16, the intercooler 17, the fuel cooler 20, and the condenser 21 can be assembled densely, and the heat exchanger unit. The excavator 1 can be reduced in size by collecting 11 compactly.

  Further, the front partition plate 12A of the support frame 12 not only serves as a partition plate defining the heat exchanger chamber 13, but also includes a control valve chamber and a tool storage chamber (both adjacent to the front side of the heat exchanger chamber 13). (Not shown) or the like can also be used as a partition plate. Thereby, the number of parts for partitioning the inside of the building cover 10 can be reduced, and improvement of productivity, weight reduction, cost reduction, and the like can be achieved.

  Further, since the support frame 12 can be integrated by a simple operation by connecting the upper part of each partition plate 12A, 12B and the upper bracket 18 of the heat exchanger assembly 14, the heat exchanger unit 11 can be integrated. Easy to assemble.

  Further, the radiator 15, the oil cooler 16, and the intercooler 17 constituting the heat exchanger assembly 14 are attached to the revolving frame 4 independently of the support frame 12 via the lower bracket 19. Therefore, the lower part of the heat exchanger assembly 14 can be individually attached to and detached from the revolving frame 4, and workability such as maintenance work and repair work can be improved.

  On the other hand, since the periphery of the cooling fan 7 is surrounded by the shroud 8, the flow can be adjusted by guiding the cooling air generated by the cooling fan 7. Moreover, since the shroud 8 is connected to the opening 12D1 of the inner surface plate 12D via a rubber cylinder (not shown), the cooling air from the cooling fan 7 is efficiently passed by the radiator 15, the oil cooler 16, and the intercooler 17. Can be made. Thereby, cooling efficiency can be improved.

  Further, the heat exchanger unit 11 can define the heat exchanger chamber 13 between the left side plate 10A and the top plate 10C of the building cover 10 by using the partition plates 12A and 12B of the support frame 12. it can. Thereby, cooling air can be efficiently distribute | circulated toward the heat exchanger assembly 14 grade | etc., And these cooling efficiency can be improved.

  Furthermore, since the heat exchanger assembly 14 is arranged in parallel with the flow direction of the cooling air by the cooling fan 7, the cooling air can be efficiently applied to them, and the cooling efficiency can be improved. . Further, since the fuel cooler 20 and the condenser 21 are arranged at the upstream position overlapping with the radiator 15 and the like in the flow direction of the cooling air, the fuel cooler 20 and the condenser 21 can be arranged using a limited space. The hydraulic excavator 1 can also be reduced in size.

  Next, FIG. 16 to FIG. 25 show a second embodiment of the present invention. The feature of the present embodiment is that the inner surface plate of the support frame is detachably provided on the upper plate portion or the side plate surrounding the upper portion of the cooling fan and the lower portion of the cooling fan. And the lower plate part.

  In FIG. 16, 31 indicates a hydraulic excavator as a construction machine according to the second embodiment. The hydraulic excavator 31 is roughly configured by a lower traveling body 32, an upper swing body 33, and a work device 55, as in the hydraulic excavator 1 according to the first embodiment described above.

  Here, in the hydraulic excavator 31 according to the second embodiment, when the upper swing body 33 is swung on the lower travel body 32, the upper swing body 33 is substantially within the vehicle width of the lower travel body 32. It is configured as a small swirler. That is, the hydraulic excavator 31 has short front and rear dimensions of a later-described swivel frame 34, and both left and right sides of a counterweight 54, which will be described later, disposed closer to the front side, wrap around to the side of the engine 36. In such an ultra-small swivel excavator 31, the installation space on the swivel frame 34 is reduced by the amount of the counterweight 54 disposed on the front side, and therefore the swivel frame 34 is disposed around the heat exchanger unit 41 described later. There are obstacles such as the left rear end plate 34H, and a space for moving the heat exchanger unit 41 in the horizontal direction cannot be secured.

  Reference numeral 34 denotes a turning frame as a body frame constituting the upper turning body 33. As shown in FIGS. 17 and 18, the swivel frame 34 forms a support structure. As in the swivel frame 4 according to the first embodiment, the bottom plate 34A, the left and right center beams 34B, The side frame 34C, the right side frame 34D, a plurality of overhanging beams 34E, and a plurality of undercovers 34F are roughly configured. Further, an attachment bracket 34G for attaching a lower bracket 50 and the like of a heat exchanger assembly 45 described later is provided on the left rear portion of the revolving frame 34.

  However, the turning frame 34 according to the second embodiment is formed to be short in the front and rear directions so as to be substantially within the vehicle width of the lower traveling body 32 when the upper turning body 33 is turned. This is different from the turning frame 4 according to the first embodiment.

  Here, when the turning frame 34 is formed short in the front and rear directions, the distance from the turning center to the counterweight 54 becomes short. However, in order to balance the weight with the work device 57 under these conditions, it is necessary to make the counterweight 54 large (heavy).

  Therefore, as shown in FIG. 18, the revolving frame 34 is formed so that the left and right outer portions of the rear end plates 34H and 34J attached to the left rear portion and the right rear portion are inclined toward the front side. Accordingly, the counterweight 54 can extend to the position where the engine 36 and the heat exchanger unit 41 are covered from the left and right directions by having both the left and right sides along the rear end plates 34H and 34J. Weight can be secured.

  Therefore, in the second embodiment, when the heat exchanger unit 41 is attached to the swivel frame 34, the heat exchanger unit 41 is indicated by the arrows shown in FIGS. 14 and 15 as described in the first embodiment. If you attempt to move horizontally in the direction indicated by arrow B after being lowered in the A direction, the rear end plate 34H on the left side becomes an obstacle and the rear partition plate 42B of the support frame 42 interferes. I can't do it.

  Reference numeral 35 denotes a cab (see FIG. 16) mounted on the left front side of the swivel frame 34. In the cab 35, as in the cab 5 according to the first embodiment, a driver's seat, various operation levers, an air conditioner Indoor units and the like (both not shown) are arranged.

  Reference numeral 36 denotes an engine as a prime mover provided on the rear side of the turning frame 34 (see FIG. 19). The engine 36 is configured in substantially the same manner as the engine 6 according to the first embodiment.

  Reference numeral 37 denotes a cooling fan provided on the left side of the engine 36. The cooling fan 37 is rotationally driven by the engine 36 in substantially the same manner as the cooling fan 7 according to the first embodiment.

  Reference numeral 38 denotes a circular shroud provided so as to surround the periphery of the cooling fan 37. The shroud 38 is formed in a circular frame shape surrounding the cooling fan 37 in substantially the same manner as the shroud 8 according to the first embodiment, and is attached to the engine 36 using, for example, three brackets 38A. . Reference numeral 39 denotes a hydraulic pump attached to the right side of the engine 36.

  Reference numeral 40 denotes a building cover provided between the cab 35 and a counterweight 54 described later and provided on the revolving frame 34 (see FIG. 16). The building cover 40 accommodates the engine 36, the hydraulic pump 39, and the like in substantially the same manner as the building cover 10 according to the first embodiment, and the cooling air circulates in the support frame body 42 described later toward the radiator 46 and the like. A heat exchanger chamber (not shown) is defined.

  Next, the heat exchanger unit by 2nd Embodiment is demonstrated, referring FIG. 19 thru | or FIG.

  Reference numeral 41 denotes a single heat exchanger unit according to the second embodiment which is located on the left side of the engine 36 and provided in the building cover 40. The heat exchanger unit 41 is roughly configured by a support frame 42, a heat exchanger assembly 45, a condenser 51, and the like, which will be described later, in substantially the same manner as the heat exchanger unit 11 according to the first embodiment described above. .

  Reference numeral 42 denotes a support frame that forms a frame structure of the heat exchanger unit 41. The support frame body 42 is formed in substantially the same manner as the support frame body 12 according to the first embodiment described above. That is, as shown in FIGS. 23, 24, and the like, the support frame body 42 includes front and rear partition plates 42A and 42B as side plates facing the front revolving body 33 with a predetermined interval in the front and rear directions, A long box-like connecting member 42C that extends in the front and rear directions so as to connect the upper portions of the partition plates 42A and 42B and covers the upper portions of the radiator 46, the oil cooler 47, and the intercooler 48, and the partition plates 42A and 42B, It is generally constituted by an inner surface plate 43 and the like which will be described later attached to the downstream side (engine 36 side) of the connecting member 42C.

  Further, on the upstream side of the support frame body 42, a reinforcing member 42D for increasing the strength while allowing the cooling air to flow is attached across the partition plates 42A and 42B. Further, a support plate 42E (shown in FIG. 23) that supports a capacitor 51 and the like described later is provided on the opposite surface side of the front partition plate 42A so as to extend in the front and rear directions.

  Furthermore, the front partition plate 42A can be bolted to the overhanging beam 34E with the lower part thereof in a state where the heat exchanger unit 41 is mounted on the revolving frame 34. Further, the lower part of the rear partition plate 42B can be fixed to the left rear end plate 34H using a plurality of bolts 42F (see FIGS. 20 and 22).

  Here, as shown in FIG. 20, the rear partition plate 42 </ b> B of the support frame body 42 fits in front of the left rear end plate 34 </ b> H of the turning frame 34. Accordingly, in the rear partition plate 42B, the outer portion is formed obliquely from the intermediate portion in the left and right directions toward the front side, almost like the left rear end plate 34H. As a result, the heat exchanger unit 41 is positioned so that the rear partition plate 42B fits into the left rear end plate 34H of the revolving frame 34. Therefore, the left rear end plate 34H is obstructed and moves in the horizontal direction. As shown in FIGS. 21 and 23, it is necessary to lower and install it from the upper side in the direction of arrow C.

  Therefore, 43 is an inner surface plate provided on the engine 36 side of the support frame body 42. The inner surface plate 43 can be attached to the revolving frame 34 only by lowering the heat exchanger unit 41 in the vertical direction. is there. That is, as shown in FIG. 25, the inner surface plate 43 includes an upper plate portion 43A that is attached to each of the partition plates 42A and 42B and covers the engine 36 side of the heat exchanger chamber (not shown), and a lower plate portion 43A. It divides | segments by the lower-plate part 43B attached to the side so that attachment or detachment is possible. Further, the upper plate portion 43A has a gate shape having a semicircular arc frame 43A1 surrounding the upper portion of the cooling fan 37 on the upper rear side. Further, the upper plate portion 43A is provided with a connecting frame 43A2 for connecting the lower part of the semicircular arc frame 43A1, and the connecting frame 43A2 is formed with a notch 43A3 for passing a fan.

  The fan passage notch 43A3 is formed by cutting the end edge on the cooling fan 37 side of the connecting frame 43A2 below the upper plate portion 43A so as to recede toward the radiator 46, thereby forming the semicircular arc frame 43A1. The lower part is opened. As a result, as shown in FIG. 23, the fan passage notch 43A3 can pass the cooling fan 37 and moves in the horizontal direction even when the upper plate 43A is lowered straight toward the cooling fan 37. The semicircular arc frame 43A1 can be disposed at a position surrounding the cooling fan 37 without any problem.

  On the other hand, as shown in FIG. 20 and the like, the lower plate portion 43B is detachably attached to the upper plate portion 43A using a plurality of bolts 43C so as to close the notch portion 43A3 for passing through the fan. Further, the lower plate portion 43B has a semicircular arc frame 43B1 surrounding the lower portion of the cooling fan 37, as shown in FIGS. The semicircular arc frame 43B1 forms an arcuate opening 44 (shown in FIGS. 19 and 20) that surrounds the shroud 38 of the cooling fan 37 in cooperation with the semicircular arc frame 43A1 of the upper plate portion 43A. is there.

  Reference numeral 45 denotes a heat exchanger assembly as a heat exchanger provided in the support frame 42. This heat exchanger assembly 45 includes a radiator 46, an oil cooler 47, an intercooler 48, which are arranged in parallel with the flow direction of the cooling air, in substantially the same manner as the heat exchanger assembly 14 according to the first embodiment. The radiator 46, the oil cooler 47, and the intercooler 48 are constituted by an upper bracket 49 for connecting the upper side and a lower bracket 50 for connecting the lower side.

  In the heat exchanger assembly 45, the upper bracket 49 is bolted to the upper part of each of the partition plates 42A and 42B before and after the support frame body 42. The lower bracket 50 is bolted at both ends in the length direction to the lower portions of the partition plates 42A and 42B of the support frame body 42. Further, when the heat exchanger unit 41 is mounted on the revolving frame 34, the lower portions of the partition plates 42A and 42B of the support frame 42 are used as the extension beam 34E of the revolving frame 34, the left rear end plate 34H using a plurality of bolts 42F and the like. And install. The lower bracket 50 connecting the lower side of the radiator 46, the oil cooler 47, and the intercooler 48 is fixed to the mounting bracket 34G of the revolving frame 34 separately from the support frame body 42 using a plurality of bolts 45A. (See FIG. 23).

  A condenser 51 is used as another heat exchanger attached to the support plate 42E of the support frame 42. The capacitor 51 is configured in substantially the same manner as the capacitor 21 according to the first embodiment, and a fuel cooler (not shown) is disposed at the parallel position. Reference numeral 52 denotes a reservoir tank attached to the front partition plate 42A of the support frame 42, and 53 denotes a dustproof net that covers the upstream side of the cooling air of the radiator 46, the oil cooler 47, and the intercooler 48, respectively.

  When assembling the heat exchanger unit 41 configured in this way, the front partition plate 42A, the rear partition plate 42B, the connecting member 42C, the upper plate portion 43A of the inner surface plate 43, and the like are connected to connect the support frame body 42. I'm assembling. In addition, the radiator 46, the oil cooler 47, and the intercooler 48 are arranged in parallel, and these are connected using the upper bracket 49 and the lower bracket 50, thereby assembling the heat exchanger assembly 45.

  Further, the upper bracket 49 of the assembled heat exchanger assembly 45 is bolted to the upper part of the partition plates 42A and 42B of the support frame 42, and the condenser 51 and the like are attached to the support plate 42E, and the reservoir tank 52 and the like are attached. . Thereby, the heat exchanger unit 41 can be assembled up to the stage of attachment to the revolving frame 34. The heat exchanger unit 41 fixes the lower part of each partition plate 42A, 42B of the support frame 42 to the extended beam 34E of the swivel frame 34 using a plurality of bolts 42F, and then attaches to the upper plate portion 43A of the inner surface plate 43. The lower plate portion 43B is attached using a plurality of bolts 43C.

  Reference numeral 54 denotes a counterweight (see FIG. 16) attached to the rear end of the revolving frame 34. The counterweight 54 balances the weight with the work device 27. Here, the excavator 31 according to the second embodiment is configured as an ultra-small turning machine in which the upper turning body 33 is substantially within the vehicle width of the lower traveling body 32, so the counterweight 54 is closer to the front side. Need to be placed. Therefore, the counterweight 54 extends to the front side along the rear end plates 34H and 34J of the revolving frame 34 so that a large weight can be secured.

  Reference numeral 55 denotes a working device provided on the front side of the upper swing body 33 so as to be able to move up and down. The work device 55 performs soil excavation work and the like in substantially the same manner as the work device 27 according to the first embodiment.

  The excavator 31 according to the second embodiment has the above-described configuration. Next, the heat exchanger unit 41 including the support frame 42, the heat exchanger assembly 45, the condenser 51, and the like is connected to the swivel frame 34 side. The procedure when attaching to will be described.

  First, the assembly operation of the heat exchanger unit 41 will be described. The support frame 42 is assembled by connecting the front partition plate 42A, the rear partition plate 42B, the connecting member 42C, the upper plate portion 43A of the inner surface plate 43, and the like. Further, the radiator 46, the oil cooler 47, and the intercooler 48 arranged in parallel are connected by the upper bracket 49 and the lower bracket 50 to assemble the heat exchanger assembly 45, and the upper bracket 49 of the heat exchanger assembly 45 is bolted. (Not shown) is attached to the support frame 42. Further, the capacitor 51, the reservoir tank 52, and the like are attached to the support frame 42. Thus, the heat exchanger unit 41 can be assembled up to the stage of attaching to the revolving frame 34, that is, the stage before the lower plate portion 43B is bolted to the upper plate portion 43A of the inner surface plate 43.

  When the heat exchanger unit 41 is almost assembled in this way, the heat exchanger unit 41 is lifted and conveyed to the assembly line of the hydraulic excavator 31 and placed on the left rear portion of the swivel frame 34. Here, the upper plate portion 43A of the inner surface plate 43 is provided with a fan passage notch portion 43A3 which is located in the lower connection frame 43A2 and opens the lower side of the semicircular arc frame 43A1.

  Therefore, in the mounting operation of the heat exchanger unit 41 according to the second embodiment, the left rear end plate 34H of the swivel frame 34 and the rear partition plate 42B of the support frame 42 as shown in FIGS. The heat exchanger unit 41 can be mounted straightly down at a predetermined position of the swivel frame 34 in the direction indicated by the arrow C without causing interference with the shroud 38 or the inner surface plate 43.

  In this state, the lower portions of the partition plates 42A and 42B of the support frame body 42 are fixed to the extended beam 34E of the revolving frame 34 using the bolts 42F. Further, the lower bracket 50 of the heat exchanger assembly 45 is fixed to the mounting bracket 34G of the swivel frame 34 by using each bolt 45A. Thereby, the heat exchanger assembly 45 and the support frame 42 can be separately and independently attached to the attachment bracket 34G of the revolving frame 34.

  On the other hand, the heat exchanger assembly 45 can remove the bolts 45 </ b> A from the brackets 49 and 50. In this manner, the heat exchanger assembly 45 can be individually detached while the support frame 42 is attached to the revolving frame 34 side.

  Furthermore, the opening 44 of the inner surface plate 43 can be connected to the outer peripheral side of the shroud 38 by attaching the lower plate portion 43B to the upper plate portion 43A of the inner surface plate 43 using each bolt 43C. Thereby, the heat exchanger unit 41 can be attached to the turning frame 34 side.

  Thus, also in the second embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment described above. In particular, in the present embodiment, the inner surface plate 43 of the support frame 42 is divided into two parts, an upper plate portion 43A surrounding the upper portion of the cooling fan 37 (the shroud 38) and a lower plate portion 43B surrounding the lower portion. It is configured so that it can be divided. Thus, when the lower plate portion 43B is removed, the lower side of the upper plate portion 43A can be opened by the fan passage notch portion 43A3.

  Therefore, the work of attaching the heat exchanger unit 41 to the revolving frame 34 is performed before the lower plate portion 43B is attached to the upper plate portion 43A of the inner surface plate 43, so that the revolving frame is simply lowered by lowering the heat exchanger unit 41 directly below. 34 can be attached. Then, after the heat exchanger unit 41 is attached to the revolving frame 34, the lower plate portion 43B is attached to the upper plate portion 43A, so that the lower portion of the cooling fan 37 that has been opened is surrounded by the opening 44. Can be surrounded.

  As a result, the heat exchanger unit 41 can be attached to a predetermined position of the revolving frame 34 simply by being lowered straight in the direction of arrow C. As a result, even when the upper swing body 33 is small and there is an obstacle around the position where the heat exchanger unit 41 is mounted, as in the hydraulic excavator 31 according to the present embodiment forming an ultra-small swing machine, the heat exchanger unit 41 can be easily attached, and assembly workability can be improved.

  In the first embodiment, the case where the radiator 15, the oil cooler 16, and the intercooler 17 are arranged in parallel to the flow direction of the cooling air has been described as an example in the heat exchanger unit 11. However, the present invention is not limited to this. For example, in the case of an engine 6 that does not include a supercharger, the intercooler is eliminated and two heat exchangers, a radiator and an oil cooler, are provided in the heat exchanger unit. Alternatively, one heat exchanger may be provided in the heat exchanger unit. Moreover, it is good also as a structure arrange | positioned in series so that a radiator, an oil cooler, etc. may overlap with the flow direction of cooling air. This configuration can be similarly applied to the second embodiment.

  In the second embodiment, the case where the lower plate portion 43B of the inner surface plate 43 is fixed to the upper plate portion 43A using the bolts 43C has been described as an example. However, the present invention is not limited to this. For example, as in the modification shown in FIG. 26, the upper plate portion 61A of the inner surface plate 61 is located up to the position of the semicircular arc frame 61A1, and is positioned below the upper plate portion 61A. The lower plate portion 61B having the semicircular arc frame 61B1 may be fixed to the partition plates 42A and 42B of the support frame body 42 using a plurality of bolts 61C.

  On the other hand, in each embodiment, the case where the engines 6 and 36 are used as the prime mover has been described as an example. However, the present invention is not limited to this. For example, in the case of an electric construction machine, another prime mover such as an electric motor may be used.

  Moreover, in each embodiment, the case where the cooling fans 7 and 37 were provided in the engines 6 and 36 was 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 each embodiment, the crawler type hydraulic excavators 1 and 31 have been described as examples 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 a first embodiment of the present invention. It is a front view which expands and shows a turning frame alone. It is a top view which expands and shows a turning frame alone. It is an expanded sectional view of the upper revolving structure seen from the arrow IV-IV direction in FIG. It is an external appearance perspective view which expands and shows the heat exchanger unit in FIG. It is the external appearance perspective view which looked at the support frame body of the heat exchanger unit alone from the front side. It is the external appearance perspective view which looked at the support frame body of the heat exchanger unit alone from the back side. It is a disassembled perspective view shown in the state which isolate | separated the inner surface board of the support frame shown in FIG. It is an external appearance perspective view which shows a heat exchanger assembly alone. It is a principal part expanded sectional view which shows the attachment state of the lower part of a turning frame, a radiator with respect to a lower bracket, and an intercooler. It is a principal part expanded sectional view which shows the attachment state of the lower part of the oil cooler with respect to a turning frame and a lower bracket. It is a principal part expansion perspective view which shows the mounting state of the heat exchanger unit with respect to a turning frame. It is the principal part expansion perspective view which looked at the state which lifted the heat exchanger unit in order to mount in a turning frame from the same position as FIG. It is the expanded sectional view which looked at the state which lifted the heat exchanger unit for mounting in a turning frame from the same position as FIG. It is the expanded sectional view which looked at the state which mounts a heat exchanger unit on a turning frame, and moves to a horizontal direction from the same position as FIG. It is a front view which shows the hydraulic shovel by the 2nd Embodiment of this invention. It is a front view which expands and shows a turning frame alone. It is a top view which expands and shows a turning frame alone. It is an external appearance perspective view which shows the attachment state of the heat exchanger unit with respect to a turning frame and a cooling fan. It is a principal part expansion perspective view which shows the attachment state of the heat exchanger unit with respect to a turning frame and a cooling fan. It is the principal part expansion perspective view which looked at the state which lifted the heat exchanger unit in order to mount in a turning frame from the same position as FIG. It is the principal part expansion perspective view which looked at the state which attaches the lower board part of an inner surface board to the heat exchanger unit mounted in the turning frame from the same position as FIG. It is an expanded sectional view which shows the state which lifted the heat exchanger unit just above the attachment position in order to mount in a turning frame. It is a disassembled perspective view which expands and shows a heat exchanger unit. It is a disassembled perspective view which expands and shows an inner surface board. It is a disassembled perspective view which expands and shows the heat exchanger unit by a modification.

Explanation of symbols

1,31 Hydraulic excavator (Construction machinery)
2,32 Lower traveling body 3,33 Upper turning body 4,34 Turning frame (body frame)
6,36 engine (motor)
7, 37 Cooling fan 8, 38 Shroud 9, 39 Hydraulic pump 10, 40 Building cover 10A Left side plate 10B Right side plate 10C Top plate 11, 41 Heat exchanger unit 12, 42 Support frame 12A, 42A Front partition plate (front side plate) )
12B, 42B Rear partition plate (rear side plate)
12C, 42C Connecting member 12D, 43, 61 Inner plate 12D1, 44 Opening 13 Heat exchanger chamber 14, 45 Heat exchanger assembly 15, 46 Radiator (heat exchanger)
16, 47 Oil cooler (heat exchanger)
17, 48 Intercooler (Heat exchanger)
18, 49 Upper bracket 19, 50 Lower bracket 20 Fuel cooler (other heat exchanger)
21,51 Condenser (other heat exchanger)
43A, 61A Upper plate portion 43A1, 43B1, 61A1, 61B1 Semi-circular frame 43A2 Connection frame 43A3 Notch portion for fan passage 43B, 61B Lower plate portion

Claims (4)

A body frame that forms a support structure, a prime mover provided on the body frame, a cooling fan that rotates using the prime mover as a power source, and heat of a fluid to be cooled by being supplied with cooling air from the cooling fan In a construction machine comprising a heat exchanger that performs exchange and a support frame that supports the heat exchanger,
The vehicle body frame includes a side plate extending in the front and rear directions located on the left and right sides of the vehicle body frame, and a top plate extending in the horizontal direction between the upper ends of the side plates. Providing a building cover covering the prime mover, cooling fan and heat exchanger;
The support frame body is provided with two side plates arranged at a predetermined interval, a connecting member that connects the upper parts of the side plates, and a motor side of the side plates facing the cooling fan. It is composed of an inner surface plate having an opening at a site,
An upper bracket is provided on the upper part of the heat exchanger,
A lower bracket is provided at a lower portion of the heat exchanger,
Both ends of the upper bracket and the lower bracket are respectively attached to the respective side portions of the support frame by bolts to constitute a single heat exchanger unit that is assembled in advance.
When the heat exchanger unit is attached to the body frame, the lower part of each side plate of the support frame is attached to the body frame with bolts , and the lower bracket of the heat exchanger is the support frame. Independently attached to the body frame with bolts ,
The heat exchanger is configured to be removable from the support frame ,
In a state where the heat exchanger unit is attached to the body frame, the partition plates as the two side plates of the support frame have a space close to the side plates and the top plate of the building cover. Configured to partition,
Each of the partition plates, the side plates, and the top plate is configured to define a heat exchanger chamber in the support frame for circulating cooling air toward the heat exchanger. machine. Wherein the shroud is provided surrounding the periphery of the cooling fan, the construction machine according to the opening of the internal surface plate constituting the supporting frame body to claim 1 comprising a structure for connecting to said shroud. The inner surface plate of the support frame includes an upper plate portion that surrounds the upper portion of the cooling fan, and a lower plate that surrounds the lower portion of the cooling fan and is detachably provided on the upper plate portion or the side plate. The construction machine according to claim 1 or 2 , comprising a part. The heat exchanger comprises an assembly of a radiator and an oil cooler arranged in parallel to the cooling air flow direction, and another heat exchanger is provided at a position overlapping the cooling air flow direction of the assembly. The construction machine according to claim 1, 2 or 3 , wherein the construction machine is arranged.

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