JP5699066B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine such as a hydraulic excavator provided with a heat exchanging device including a radiator for cooling engine coolant on a body frame, for example.

  In general, a hydraulic excavator as a typical example of a construction machine includes a lower traveling body capable of self-propelling, an upper revolving body provided on the lower traveling body so as to be able to swivel, and front and rear sides of the upper revolving body. And a working device provided so as to be able to move up and down.

  The upper swing body includes a swing frame that forms a support structure of the vehicle body, a counterweight provided at a rear portion of the swing frame that balances the weight of the work device, and a front side of the counterweight that is positioned on the swing frame. An engine mounted in a horizontally extending state extending in the left and right directions, a cooling fan that is provided in the engine and sucks external air as cooling air, and is located upstream of the cooling fan in the flow direction of the cooling air. And a heat exchange device including a radiator that is provided to face the cooling fan and cools the engine coolant with the cooling air.

  The swivel frame includes left and right vertical plates to which a working device is attached on the front side, and left and right side frames that are positioned outside the vertical plates and extend in the front and rear directions. A partition cover is erected between the heat exchange device and the counterweight so that the front side of the counterweight extends leftward and rightward.

  On the other hand, on the opposite side of the cooling fan across the heat exchange device, a dust-proof net is disposed facing the heat exchange device, and the dust-proof net covers the upstream side of the heat exchange device, thereby providing dust, insects, etc. to the radiator, etc. To prevent clogging of foreign objects.

  Furthermore, a reserve tank for storing cooling water supplied to the radiator is provided in the partition cover, which is located in the upstream space of the upstream side of the dustproof net in the flow direction of the cooling air. The reserve tank is connected to the radiator by a hose member. Here, the hose member is connected at the shortest distance by linearly extending between the reserve tank and the radiator so that the cooling water can smoothly flow (see, for example, Patent Document 1).

JP 2006-46233 A

  By the way, the dust-proof net provided on the upstream side of the cooling air of the heat exchange device prevents foreign matters such as dust and insects from adhering to the radiator and the like. For this reason, the dust-proof net needs to be in a shielded state with its periphery closely attached to the heat exchange device.

  However, when the reserve tank and the radiator are linearly connected by a hose member as in Patent Document 1, the hose member passes through the counterweight side of the dustproof net. Therefore, even if the hose member is passed through the counterweight side of the dustproof net, a special part such as a notch or a bent part is formed in a part of the dustproof net in order to shield foreign matter from passing through the partition cover. Or a sealing member for filling a gap between the dustproof net and the hose member. As a result, there is a problem that the shape of the dustproof net becomes complicated and the manufacturing cost increases.

  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 prevent the heat exchange device from dust by disposing the hose member between the reserve tank and the radiator. The object is to provide a construction machine capable of easily installing a net.

  A construction machine according to the present invention comprises a vehicle body frame that forms a support structure for a vehicle body and a work device is attached to the front side, and a counterweight provided at a rear portion of the vehicle body frame to balance the weight of the work device, An engine provided on the vehicle body frame, a cooling fan that sucks external air as cooling air by rotating using the engine as a power source, and an upstream side of the cooling fan in the flow direction of the cooling air A heat exchange device including a radiator that is provided facing the cooling fan and cools engine cooling water with cooling air, and is located on the opposite side of the cooling fan across the heat exchange device and faces the heat exchange device. A dust-proof net, a partition cover erected between the heat exchanging device and the counterweight, and extending in front of the counterweight; A reserve tank that is located in the upstream space of the net upstream of the net in the flow direction of the cooling air and that is provided in the partition cover and stores cooling water supplied to the radiator, and a hose member that connects the reserve tank and the radiator And comprising.

  In order to solve the above-described problem, the feature of the configuration of the invention of claim 1 is that the space upstream of the counterweight side of the dustproof net and the partition cover are located between the net upstream space and the dustproof net. The partition cover is configured to shield the flow of cooling air from the downstream side of the net, and the partition cover is provided with a first hose insertion port located on the net upstream space side, and the net downstream space side A second hose insertion port is provided, the hose member is disposed on the rear side of the partition cover from the reserve tank through the first hose insertion port, and the partition through the second hose insertion port. The configuration is such that it is disposed on the front side of the cover and connected to the radiator.

  According to a second aspect of the present invention, the partition cover is provided with a seal member that fills a gap between the second hose insertion port and the hose member.

  According to the first aspect of the present invention, the partition cover is provided with the first hose insertion port located on the upstream side of the net upstream space in the flow direction of the cooling air from the dustproof net, and more cooled than the dustproof net. The second hose insertion port is provided in the net downstream space downstream of the wind flow direction. On this, the hose member is disposed on the rear side of the partition cover from the reserve tank through the first hose insertion port, and is disposed on the front side of the partition cover through the second hose insertion port and connected to the radiator. It is configured to do.

  Therefore, even if the space between the end face on the counterweight side of the dustproof net and the partition cover is configured to shield the flow of cooling air from the net upstream space to the net downstream space, the intermediate part of the hose member is Can be arranged behind the partition cover. Thereby, a dust-proof net can be provided in the position which faces a heat exchange device, without being disturbed by a hose member.

  As a result, the dust-proof net does not need to be specially processed to avoid the hose member, and thus can be formed into a square shape that can be easily processed, for example, and the manufacturing cost can be reduced. Moreover, the square dustproof net can cover the space between the net upstream space and the net downstream space without any gap on the upstream side of the heat exchange device, so that dust and insects can be reliably caught, and the heat exchange device can be Can be kept clean. Further, the square dustproof net can be easily attached to or removed from the heat exchange device by its simple structure. Further, in addition to the dustproof net, for example, an intercooler, a capacitor, and the like can be easily provided at a position facing the radiator.

  According to the invention of claim 2, the partition cover is provided with a seal member that fills a gap between the second hose insertion port and the hose member. Accordingly, it is possible to prevent dust, insects and the like from entering the space downstream of the net from the gap between the second hose insertion port and the hose member, and the heat exchange device can be kept even cleaner.

1 is a front view showing a hydraulic excavator according to an embodiment of the present invention. It is an enlarged plan view showing a hydraulic excavator in a state where a part of the working device and an exterior cover are omitted. It is a top view which shows the turning frame carrying an engine, a heat exchange apparatus, etc. FIG. 4 is an enlarged external perspective view of a heat exchange device, a dustproof net, a partition cover, a reserve tank, and the like viewed from the direction of arrows IV-IV in FIG. 2. It is the external appearance perspective view of the principal part expansion which looked at the state which removed the dustproof net from the same position as FIG. It is an external appearance perspective view which expands and shows the partition cover in FIG. 4, a reserve tank, a hose member, etc. It is a disassembled perspective view which shows the state which removed the reserve tank from the partition cover and the hose member. It is an external appearance perspective view which shows a partition cover alone. FIG. 7 is a cross-sectional view showing a partition cover, a reserve tank, a hose member and the like together with a left side frame, a counterweight, a heat exchange device, and a dustproof net as viewed from the direction of arrows IX-IX in FIG. 6. It is a cross-sectional view which expands and shows the partition cover in FIG. 9, a reserve tank, a hose member, a dustproof net, etc.

  Hereinafter, as a typical example of a construction machine according to an embodiment of the present invention, a hydraulic excavator equipped with an engine will be described as an example and will be described in detail with reference to FIGS.

  In FIG. 1, reference numeral 1 denotes a crawler hydraulic excavator as a construction machine. The hydraulic excavator 1 includes a self-propelled crawler-type lower traveling body 2, an upper revolving body 3 that is turnably mounted on the lower traveling body 2 and forms a vehicle body together with the lower traveling body 2, and the upper It is generally constituted by a working device 4 that is provided in front of the revolving structure 3 and on the front side in the rearward direction so as to be able to move up and down and that performs excavation work of earth and sand.

  Here, the hydraulic excavator 1 is configured as a small turning machine in which the upper turning body 3 is substantially within the vehicle width of the lower traveling body 2. As shown in FIG. 2, the upper swing body 3 in this case has a substantially circular shape so that at least the rear side is substantially within the vehicle width of the lower traveling body 2, and is formed compact as a whole.

  Reference numeral 5 denotes a revolving frame as a vehicle body frame that forms a support structure for the upper revolving structure 3. As shown in FIG. 3, the revolving frame 5 has a bottom plate 5A made of a thick steel plate or the like extending in the front and rear directions, and is erected on the bottom plate 5A, and front and rear with a predetermined interval in the left and right directions. Left vertical plate 5B, right vertical plate 5C extending in the direction, left side frame 5D, right side frame 5E extending in the front and rear directions, spaced apart from the vertical plates 5B, 5C, and the bottom plate 5A, each of the vertical plates 5B and 5C is extended in the left and right directions, and is formed of a plurality of extended beams 5F that support the left and right side frames 5D and 5E at the front ends thereof. As shown in FIG. 2, the working device 4 is attached to the front side of each of the vertical plates 5B and 5C so as to be able to move up and down, and an engine 8 and the like to be described later are mounted on the rear side.

  Reference numeral 6 denotes a cab mounted on the left front side of the revolving frame 5 (see FIGS. 1 and 2). The cab 6 is used by an operator, and includes a driver's seat on which the operator is seated, an operation lever for traveling, an operation lever for work (none of which are shown), and the like.

  Reference numeral 7 denotes a counterweight attached to the rear portion of the swing frame 5. The counterweight 7 is in a weight balance with the work device 4 and is formed as a heavy object having an arc shape. In this arc-shaped counterweight 7, the center position in the left and right directions of the front surface portion is a central flat surface portion 7A extending linearly in the left and right directions, and both sides of the central flat surface portion 7A are inclined forward. The left inclined surface portion 7B and the right inclined surface portion 7C are extended. The counterweight 7 is arranged at a position close to the turning center so that the rear side of the upper turning body 3 is substantially within the vehicle width of the lower traveling body 2 even during the turning operation.

  Reference numeral 8 denotes an engine provided on the rear side of the revolving frame 5, and the engine 8 is mounted in a horizontally placed state extending in the left and right directions. A cooling fan 8A is provided on the left side of the engine 8. The cooling fan 8A is driven to rotate by using the engine 8 as a power source, thereby sucking outside air as cooling air, a radiator 13 of the heat exchange device 11 described later, The cooler 14 and the intercooler 15 are supplied. On the other hand, an exhaust manifold 8B provided on the front side of the engine 8 is provided with a supercharger 8C for forcibly sending air into each cylinder of the engine 8 using exhaust gas. Further, a water jacket (not shown) through which cooling water flows is provided inside the engine 8, and this water jacket is connected to the radiator 13.

  A hydraulic pump 9 is provided on the right side of the engine 8. The hydraulic pump 9 is driven by the engine 8 so as to increase (pressurize) and discharge hydraulic oil supplied from a hydraulic oil tank 26 described later. The hydraulic fluid returned by driving various actuators is returned to the hydraulic oil tank 26 after being cooled by an oil cooler 14 described later.

  Reference numeral 10 denotes an exterior cover provided on the revolving frame 5 from the rear side to the side of the cab 6. The exterior cover 10 covers the engine 8, the hydraulic pump 9, the heat exchange device 11 and the like mounted on the revolving frame 5. Further, when the cooling fan 8A of the engine 8 is rotationally driven, the exterior cover 10 allows outside air to flow in as cooling air from the side door 10A located on the upstream side, cools each part, and warms the cooling air downstream. From the side door (not shown).

  Reference numeral 11 denotes a heat exchange device provided on the rear side of the revolving frame 5 so as to face the cooling fan 8A of the engine 8. This heat exchange device 11 cools various fluids whose temperature has risen with cooling air. As shown in FIGS. 3, 4, and 5, the heat exchange device 11 is roughly configured by a support frame 12, a radiator 13, an oil cooler 14, an intercooler 15, and the like which will be described later.

  Reference numeral 12 denotes a support frame that forms an outer frame of the heat exchange device 11. The support frame 12 is mounted in a horizontally installed state extending in the direction orthogonal to the flow direction of the cooling air by the cooling fan 8A of the engine 8, that is, in the left and right directions as in the present embodiment. Then, it arrange | positions so that the front and back direction of the upper revolving structure 3 may turn into a horizontal direction. The support frame 12 is formed as a frame structure that surrounds and supports the radiator 13, the oil cooler 14, the intercooler 15, and the like.

  As shown in FIGS. 5 and 9, the support frame 12 includes a first side plate 12A and a second side plate 12B provided in a state of sandwiching the radiator 13, the oil cooler 14 and the like from the lateral direction, A top plate 12C that connects the side plates 12A and 12B at the upper position of the side plates 12A and 12B, and a bottom plate that connects the side plates 12A and 12B at the lower position of the side plates 12A and 12B. (Not shown) and a fan cover 12D (see FIG. 3) on the engine 8 side surrounding the cooling fan 8A. In the support frame 12, for example, the lower portions of the side plates 12 </ b> A and 12 </ b> B are bolted to the extended beam 5 </ b> F of the revolving frame 5.

  A net support member 12E for supporting a lower end portion of a dust-proof net 16, which will be described later, extends in the front and rear directions over the side plates 12A and 12B at the lower outer position on the left and right directions. It is extended. On the other hand, on the upper surface plate 12C, net mounting brackets 12F for mounting the upper portion of the dust-proof net 16 are provided, for example, at two locations separated in the front and rear directions.

  Reference numeral 13 denotes a radiator serving as one of heat exchangers provided in the support frame 12. The radiator 13 is positioned near the counterweight 7 in the support frame 12 and the front and rear directions of the revolving frame 5 are arranged in the lateral direction so as to be orthogonal to the flow direction of the cooling air by the cooling fan 8A of the engine 8. Is arranged as.

  The radiator 13 cools the engine cooling water whose temperature has risen by cooling the engine 8, and is roughly constituted by an upper tank 13 A, a lower tank (not shown), and a heat radiating portion 13 B. Each tank 13 A is the water of the engine 8. Connected to the jacket. In the radiator 13, the upper tank 13A is bolted to the upper surface plate 12C of the support frame 12, and the lower tank is bolted to the lower surface plate.

  Here, the upper tank 13A of the radiator 13 is provided with a water supply port 13C located substantially in the middle in the lateral width direction, and a cap 13D is attached to the water supply port 13C. The other end 23B of the hose member 23 described later is connected to the water supply port 13C, and when the cooling water is reduced, the reduced amount of cooling water is supplied from a reserve tank 20 described later.

  An oil cooler 14 is one of the heat exchangers provided in the support frame 12 in parallel with the radiator 13. The oil cooler 14 is located closer to the cab 6 side in the support frame 12 and is disposed so as to form substantially the same plane as the radiator 13. The oil cooler 14 is roughly configured by an upper tank, a lower tank, and a heat radiating portion, and is bolted to the support frame 12 in the same manner as the radiator 13.

  An intercooler 15 is provided on the opposite side of the cooling fan 8A across the radiator 13 and the oil cooler 14 and serves as one of the heat exchangers. The intercooler 15 cools the intake air flowing from the supercharger 8 </ b> C of the engine 8 and flows out toward the intake side of the engine 8. The intercooler 15 is disposed so as to face the upper position of the radiator 13 and the oil cooler 14. The intercooler 15 is roughly constituted by a front tank 15A located on the cab 6 side, a rear tank 15B located on the counterweight 7 side, and a heat radiating portion 15C extending forward and rearward between the tanks 15A and 15B. ing. The intercooler 15 has a front tank 15A on the inflow side connected to the supercharger 8C of the engine 8 and a rear tank 15B on the outflow side connected to the intake side of the engine 8.

  The heat exchanging device 11 configured as described above is such that the support frame 12, the radiator 13, the oil cooler 14, the intercooler 15 and the like are mounted on the revolving frame 5 as a single assembly unit, for example, together with a dustproof net 16 described later. It has been. Further, in the heat exchange device 11, for example, a condenser, a fuel cooler, or the like can be arranged in an empty space below the intercooler 15.

  Reference numeral 16 denotes a dust-proof net that is attached to the heat exchange device 11 and is detachable. The dust-proof net 16 is located opposite to the cooling fan 8A of the engine 8 with the heat exchange device 11 interposed therebetween, and is disposed facing the radiator 13, the oil cooler 14, and the intercooler 15. The dust-proof net 16 captures dust, insects, etc. in the cooling air sucked by the cooling fan 8A. As shown in FIG. 4, the dust-proof net 16 includes a front net portion 16A formed in a rectangular shape that is long in the upward and downward directions, and a front portion bent from the upper portion of the front net portion 16A and extending toward the engine 8 side. , And bent in an inverted L shape by a rectangular upper surface net portion 16B elongated in the rear direction.

  Here, the dust-proof net 16 engages the lower end portion of the front net portion 16A with the net support member 12E of the support frame 12, and in this state, attaches the upper surface net portion 16B to the net mounting bracket 12F. Thereby, the dust-proof net 16 can catch dust, insects, and the like mixed in the cooling air supplied from the left side, which is the left side in the left and right directions, by the front net portion 16A. On the other hand, the upper surface net portion 16B can catch dust, insects and the like in the cooling air supplied from above.

  Since it is not necessary to avoid the hose member 23 for the reasons described later, the dustproof net 16 can be formed by a combination of simple rectangular bodies, and can be manufactured at a low cost by simplifying the configuration. In this case, as shown in FIG. 10, the rectangular dust-proof net 16 can be formed so that the rear end face 16A1 on the counterweight 7 side of the front net portion 16A is linearly formed upward and downward. The end face 16A1 can be brought into contact with a net support plate 17E of the partition cover 17 described later without a gap. As a result, as shown in FIG. 9, the dust-proof net 16 can block the flow of cooling air from the net upstream space A described later against the net downstream space B in cooperation with the partition cover 17.

  A partition cover 17 is provided between the heat exchange device 11 and the counterweight 7 and is erected on the revolving frame 5. The partition cover 17 is configured as a plate-like body extending obliquely forward from the rear position of the heat exchange device 11 on the front side of the counterweight 7 toward the rear side of the left side frame 5D of the swivel frame 5. As shown in FIG. 8, the partition cover 17 is formed of a flat plate member, and when attached to the swivel frame 5, a flat plate member 17A having a rectangular cutout portion 17A1 on the outside in the left and right directions. The plate member 17A is formed with an inverted L-shaped bent member 17B attached to the flat plate member 17A so as to surround the notch 17A1 of the flat plate member 17A so as to have a vertically long rectangular outer shape.

  The flat plate member 17 </ b> A is provided with a mounting bracket 17 </ b> C at a lower part on the outer side, and the mounting bracket 17 </ b> C can be attached to the rear portion of the left side frame 5 </ b> D of the revolving frame 5. Two screw holes 17 </ b> D are provided at an intermediate position outside the flat plate member 17 </ b> A so as to be located below the first hose insertion port 18 described later. The two screw holes 17D are for screwing bolts 22 for mounting a tank mounting bracket 21 described later.

  Further, the flat plate member 17A is provided with a net support plate 17E extending upward and downward along the edge of the notch 17A1 on the heat exchange device 11 side. The net support plate 17E is formed of a long plate bent in an L-shaped cross section, and is integrally attached to the front side of the flat plate member 17A. As shown in FIG. 10, when the dust-proof net 16 is attached to the support frame 12, the net support plate 17E contacts the rear end surface 16A1 of the front net portion 16A and supports the dust-proof net 16 from the inside. . Here, the net support plate 17E is in contact with the rear end face 16A1 of the front net portion 16A, so that dust and insects do not pass through the gap between the net upstream space A and the net downstream space B. The flow can be blocked.

  The partition cover 17 is bolted to the projecting beam 5F of the revolving frame 5 at the lower end of the flat plate member 17A, and the lower mounting bracket 17C is bolted to the rear of the left side frame 5D. As shown, the counterweight 7 is arranged substantially parallel to the left inclined surface portion 7B with a desired gap S at a position facing the left inclined surface portion 7B. An intermediate portion 23C of a hose member 23 described later can be passed through the gap S.

  Reference numeral 18 denotes a first hose insertion port provided on the outer side in the left and right directions of the partition cover 17. As shown in FIGS. 6, 7, and 8, the first hose insertion opening 18 is formed as an opening surrounded by the notch 17A1 and the bending member 17B of the flat plate member 17A. The first hose insertion port 18 is provided to be opened on the net upstream space A side to be described later in the partition cover 17. As a result, as shown in FIG. 10, the hose member 23 extending from the reserve tank 20 can be disposed on the rear side of the partition cover 17 through the first hose insertion port 18. Thus, by arranging the intermediate portion 23C of the hose member 23 on the rear side of the partition cover 17 avoiding the dust-proof net 16, the dust-proof net 16 can be formed in a simple rectangular shape.

  Reference numeral 19 denotes a second hose insertion port provided on the left and right sides of the partition cover 17 (see FIG. 8). The second hose insertion port 19 is located on the net downstream space B side to be described later in the partition cover 17, that is, between the dust-proof net 16 and the radiator 13 of the heat exchange device 11. Is provided as a horizontally long oval opening. As a result, as shown in FIGS. 9 and 10, the hose member 23 disposed on the rear side of the partition cover 17 through the first hose insertion port 18 passes through the second hose insertion port 19 to the front side of the partition cover 17. It can be arranged again and can be connected to the water inlet 13C of the radiator 13.

  Here, as shown in FIG. 9, the upstream side of the cooling air flow direction with respect to the dustproof net 16, specifically, the partition cover 17, the front net portion 16 </ b> A of the dustproof net 16 and the left of the swivel frame 5 in plan view. A range surrounded by the side frame 5D is a net upstream space A (a range indicated by a lattice pattern in FIG. 9). The net upstream space A is a region located upstream of the dustproof net 16 in the flow direction of the cooling air sucked from outside when the cooling fan 8A of the engine 8 is rotationally driven.

  On the other hand, the space in the support frame 12 is a net downstream space B (range indicated by a dot pattern in FIG. 9) in plan view. This net downstream space B is an area where the cooling air that has passed through the dust-proof net 16 circulates, and is provided with a radiator 13, an oil cooler 14, and an intercooler 15. That is, the net downstream space B is a space located on the downstream side of the dust-proof net 16 in the cooling air flow direction.

  Reference numeral 20 denotes a reserve tank provided in the partition cover 17, and the reserve tank 20 stores cooling water supplied to the radiator 13. The reserve tank 20 is located in the net upstream space A and is provided on the flat plate member 17 </ b> A of the partition cover 17. The reserve tank 20 is composed of a rectangular parallelepiped container 20A, and a water supply port 20B is provided on the upper surface of the container 20A. A cap 20C is detachably attached to the water supply port 20B, and two hose connection pipes 20D and 20E communicating with the inside of the container 20A are provided on the cap 20C. A hose member 23 described later is connected to one hose connection pipe 20D opened near the bottom in the container 20A. A drain hose 25 to be described later is connected to the other hose connection pipe 20E opened at the top in the container 20A.

  As shown in FIG. 7, the reserve tank 20 has a U-shaped tank mounting bracket 21 attached so as to surround the container 20 </ b> A, and bolts 22 inserted through both ends of the tank mounting bracket 21 are screwed to the partition cover 17. It is attached to the front surface of the flat plate member 17A by being screwed into the hole 17D.

  Reference numeral 23 denotes a hose member for connecting the reserve tank 20 and the radiator 13. The hose member 23 circulates cooling water between the reserve tank 20 and the radiator 13 and is formed of, for example, a flexible rubber hose.

  Here, a connection path when the hose member 23 is connected to the reserve tank 20 and the radiator 13 will be described with reference to FIGS. 9 and 10. One end portion 23A of the hose member 23 is located in the net upstream space A and is connected to one hose connection pipe 20D of the reserve tank 20, and the intermediate portion 23C is partitioned from the net upstream space A through the first hose insertion port 18. It arrange | positions in the clearance gap S between the cover 17 and the left inclined surface part 7B of the counterweight 7. FIG. Further, the intermediate portion 23C of the hose member 23 is disposed in the net downstream space B located on the front side of the partition cover 17 through the second hose insertion port 19 from the gap S, and the other end portion 23B is disposed in the net downstream space B. It is connected to the water supply port 13 </ b> C of the radiator 13. Accordingly, the intermediate portion 23 </ b> C of the hose member 23 can be retracted to the rear side of the partition cover 17 at the position of the dust-proof net 16, that is, the gap S between the partition cover 17 and the counterweight 7.

  Reference numeral 24 denotes a seal member provided on the front surface of the flat plate member 17 </ b> A of the partition cover 17 so as to cover the second hose insertion port 19. The seal member 24 is formed in a rectangular parallelepiped shape using, for example, a foamed urethane material having elasticity, and a cut 24A is formed. As shown in FIG. 6, the seal member 24 can fill the gap with the hose member 23 by elastic force by passing the hose member 23 through the cut 24 </ b> A while covering the second hose insertion port 19. As a result, the seal member 24 can prevent dust, insects, and the like from entering the net downstream space B from the gap between the second hose insertion port 19 and the hose member 23, and can keep the radiator 13 and the like clean. .

  A drain hose 25 is connected to the other hose connection pipe 20E of the reserve tank 20. The drain hose 25 draws air into and out of the container 20A (breaths), and the tip of the drain hose 25 extends to the lower side of the swivel frame 5 so as not to contaminate the surroundings even when part of the cooling water is discharged. It extends.

  Reference numeral 26 denotes a hydraulic oil tank (see FIG. 2) provided on the revolving frame 5 and positioned on the front side of the hydraulic pump 9. The hydraulic oil tank 26 stores hydraulic oil supplied to the hydraulic pump 9. Reference numeral 27 denotes a fuel tank provided on the side of the hydraulic oil tank 26.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, the operation of the hydraulic excavator 1 will be described.

  First, the operator gets on the cab 6 and sits on the driver's seat. By operating the traveling lever in this state, the lower traveling body 2 can be driven to move the hydraulic excavator 1 forward or backward. The operator seated in the driver's seat can operate the working device 4 and the like to perform excavation work of soil and the like by operating the working lever.

  When the hydraulic excavator 1 is operating as described above, external air is caused to flow from the side door 10A of the exterior cover 10 by the cooling fan 8A of the engine 8, and this air is used as cooling air for the radiator 13 of the heat exchange device 11, By supplying the oil cooler 14 and the intercooler 15, the fluid flowing through each can be cooled.

  On the other hand, the dust-proof net 16 has the rear end face 16A1 of the front net portion 16A in contact with the net support plate 17E of the partition cover 17 without any gap, and thus covers the entire upstream side of the radiator 13, the oil cooler 14, and the intercooler 15. Can do. Thereby, the dust-proof net 16 can prevent dust and insects from adhering to and accumulating on the radiator 13, the oil cooler 14, and the intercooler 15 by reliably capturing dust and insects in the cooling air. . In particular, insects contain oil, and when they adhere to the radiator 13, oil cooler 14, and intercooler 15 that have become hot, it takes time and effort to remove them, so the burden of cleaning work is prevented by preventing the attachment of insects. Can be reduced.

  Thus, according to the present embodiment, the partition cover 17 is provided with the first hose insertion port 18 located on the upstream side of the net upstream space A in the flow direction of the cooling air from the dustproof net 16, The second hose insertion port 19 is provided on the net downstream space B side downstream of the dustproof net 16. On this, the hose member 23 that connects the reserve tank 20 and the radiator 13 passes from the reserve tank 20 positioned in the net upstream space A through the first hose insertion port 18 to the rear side of the partition cover 17, that is, the partition cover 17. It is arranged in the gap S between the counterweight 7 and the left inclined surface portion 7B, and is connected to the radiator 13 in the net downstream space B arranged on the front side of the partition cover 17 through the second hose insertion port 19.

  Accordingly, the intermediate portion 23C of the hose member 23 can be disposed on the rear side of the partition cover 17, and can be retracted from the net upstream space A so as not to interfere with the arrangement of the dustproof net 16. Thereby, the dust-proof net 16 can abut the rear end face 16A1 of the front net portion 16A on the net support plate 17E of the partition cover 17 without any gap, and the net upstream space A and the net downstream space B in this portion The flow of the cooling air in between can be shielded.

  As a result, the dust-proof net 16 does not need to be provided with a notch or a bent portion for avoiding the hose member 23, so that it can be formed into a rectangular shape that can be easily processed and shielded, and the manufacturing cost can be reduced. Moreover, the rectangular dust-proof net 16 can cover the upstream side of the heat exchange device 11 without any gaps, and can improve the capture performance for catching dust and insects and keep the heat exchange device 11 clean. Further, the dustproof net 16 can be easily attached to or removed from the support frame 12 of the heat exchange device 11 without being obstructed by the hose member 23. Furthermore, by retracting the hose member 23, for example, a capacitor, a fuel cooler, and the like other than the dustproof net 16 can be easily provided at a position facing the radiator 13.

  Further, since the partition cover 17 is provided with a seal member 24 that fills the gap between the second hose insertion port 19 and the hose member 23, dust, from the gap between the second hose insertion port 19 and the hose member 23, Insects can be prevented from entering, and the heat exchange device 11 can be kept even cleaner.

  In the embodiment, the first hose insertion port 18 of the partition cover 17 is formed as a very large opening compared to the second hose insertion port 19. However, the present invention is not limited to this, and the first hose insertion port 18 may be formed as a small opening that allows the hose member 23 to pass through, similarly to the second hose insertion port 19.

  Moreover, in embodiment, the case where the radiator 13, the oil cooler 14, and the intercooler 15 are provided in the heat exchange apparatus 11 is illustrated. However, the present invention is not limited to this, and for example, only the radiator 13 and the oil cooler 14 may be provided in the heat exchange device 11. Further, the heat exchanger 11 may be provided with only the radiator 13. On the other hand, it is good also as a structure which arrange | positions the capacitor | condenser, fuel cooler, etc. of an air conditioner.

  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. Furthermore, the present invention can be widely applied to other construction machines including an engine such as a hydraulic crane and a wheel loader.

1 Excavator (construction machine)
2 Lower traveling body (car body)
3 Upper swing body (car body)
4 Working device 5 Turning frame (body frame)
7 Counterweight 8 Engine 8A Cooling Fan 11 Heat Exchanger 12 Support Frame 13 Radiator 14 Oil Cooler 15 Intercooler 16 Dustproof Net 16A Front Net Part 16A1 Rear End Face 16B Top Net Part 17 Partition Cover 18 First Hose Insertion Port 19 Second Hose insertion port 20 Reserve tank 23 Hose member 23C Intermediate part 24 Seal member A Net upstream space B Net downstream space S Clearance between partition cover and counterweight

Claims (2)

A vehicle body frame that forms a support structure for the vehicle body and the working device is attached to the front side, a counterweight provided at the rear of the vehicle body frame to balance the weight of the working device, and a vehicle body frame provided on the vehicle body frame An engine, a cooling fan that sucks in external air as cooling air by rotating with the engine as a power source, and facing the cooling fan located upstream of the cooling fan in the flow direction of the cooling air A heat exchanging device including a radiator that cools engine cooling water by cooling air, and a dust-proof net that is positioned opposite to the cooling fan across the heat exchanging device and facing the heat exchanging device; A partition cover standing between the heat exchange device and the counterweight and extending in front of the counterweight, and a cooling airflow from the dustproof net. Construction machine comprising a reserve tank that is provided in the partition cover and that is provided in the partition cover and stores cooling water to be supplied to the radiator, and a hose member that connects the reserve tank and the radiator In
Between the counterweight side end face of the dustproof net and the partition cover, the net upstream space is configured to shield the flow of cooling air from the net downstream space downstream of the dustproof net,
The partition cover is provided with a first hose insertion port located on the net upstream space side, and a second hose insertion port is provided on the net downstream space side,
The hose member is disposed on the rear side of the partition cover from the reserve tank through the first hose insertion port, and is disposed on the front side of the partition cover through the second hose insertion port and connected to the radiator. Construction machinery characterized by that.   The construction machine according to claim 1, wherein the partition cover is provided with a seal member that fills a gap between the second hose insertion port and the hose member.

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