Construction machine

Abstract

To improve workability by omitting cleaning work when supplying urea water to a urea water tank.SOLUTION: The urea-water tank 19 which stores the urea-water and in which the water injection port 19G for injecting the urea-water is provided so as to open upward is provided with the receiving vessel 26 in a state of surrounding the water injection port 19G, the drain hose 29 for discharging the urea-water is connected to the receiving vessel 26, and the tank bracket 21 which attaches the urea-water tank 19 to the revolving frame 5 is provided with the hose fixing part 30 which fixes the drain hose 29.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to, for example, a construction machine equipped with a urea water tank that stores urea water to be supplied to an exhaust gas aftertreatment device. [Background technology]

[0002] A hydraulic excavator, a typical example of construction machinery, is composed of a self-propelled lower running body, an upper rotating body that is rotatably mounted on the lower running body, and a work device that is rotatably mounted on the front side of the upper rotating body.

[0003] The upper rotating body is composed of a rotating frame that forms a support structure, an engine mounted on the rotating frame, an exhaust gas aftertreatment device that is connected to the exhaust side of the engine and performs aftertreatment of the exhaust gas emitted from the engine, and a urea water tank that stores urea water to be supplied to the exhaust gas aftertreatment device (Patent Document 1).

[0004] The urea solution tank is attached to the revolving frame by a tank reinforcing member disposed between the revolving frame and the urea solution tank. The urea solution tank has a water filler opening that opens upward for filling the urea solution. This allows an operator to replenish the urea solution tank with urea solution through the water filler opening by inserting a water supply nozzle into the water filler opening. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6297276 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when replenishing the urea water tank with urea water by inserting a water supply nozzle into the water filler port, the urea water may spill from the water filler port onto the surrounding area if the urea water is discharged with a strong force from the water supply nozzle or if the urea water splashes off a strainer or the like provided in the water filler port. In this case, the urea water must be washed away immediately because it corrodes some metals and resins. Therefore, in addition to the work of supplying the urea water, the work of washing the urea water must also be carried out, which poses a problem of labor and time required for the work.

[0007] An object of one embodiment of the present invention is to provide a construction machine that can improve workability when supplying urea water to a urea water tank. [Means for solving the problem]

[0008] One embodiment of the present invention is a construction machine comprising a body frame that forms a support structure for the body, a urea water tank that stores urea water and has an upwardly opening water inlet for injecting urea water, and a tank bracket that is arranged between the body frame and the urea water tank and attaches the urea water tank to the body frame, in which a receiving container is provided in the urea water tank surrounding the water inlet, a pipe connected to the receiving container for discharging the urea water, and a pipe fixing portion that fixes the pipe to the tank bracket. [Effects of the Invention]

[0009] According to one embodiment of the present invention, it is possible to improve the workability when supplying urea water to the urea water tank. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a right side view showing a hydraulic excavator applied to a first embodiment of the present invention. [Figure 2] FIG. 2 is a plan view of the hydraulic excavator with a working implement and a part of the building cover omitted. [Figure 3] FIG. [Figure 4] FIG. 2 is a plan view showing the right front part of the revolving frame, the urea water tank, the tank bracket, the receiving container, etc. [Figure 5] FIG. 2 is a perspective view showing the right front portion of the revolving frame, the urea water tank, the tank bracket, the receiving container, the tip of the drain hose, etc., from the diagonally lower right side. [Figure 6] FIG. 2 is an exploded perspective view of the right front portion of the revolving frame and a tank assembly including a urea water tank, a tank bracket, a receiving container, and a drain hose, viewed from diagonally above right. [Figure 7] FIG. 2 is a perspective view showing the right front portion of the revolving frame and the tank assembly in an exploded state, viewed from diagonally below right. [Figure 8] FIG. 2 is a perspective view showing a tank assembly. [Figure 9] FIG. 2 is a perspective view showing a receiving container and a drain hose. [Figure 10] FIG. 10 is a perspective view showing a tank assembly equipped with a drain hose according to a second embodiment of the present invention, viewed from diagonally below right, in a state separated from the right front part of the revolving frame. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, a crawler type hydraulic excavator will be taken as an example of a construction machine according to an embodiment of the present invention and will be described in detail with reference to the accompanying drawings.

[0012] Figures 1 to 9 show a first embodiment of the present invention. In Figure 1, a hydraulic excavator 1 constitutes a crawler-type construction machine. The hydraulic excavator 1 comprises a self-propelled crawler-type lower traveling body 2, an upper rotating body 3 that is rotatably mounted on the lower traveling body 2 and forms a vehicle body together with the lower traveling body 2, and a work device 4 that is rotatably provided on the front side of the upper rotating body 3 and performs work such as excavating earth and sand.

[0013] As shown in Figures 2 and 3, the upper rotating body 3 is composed of a rotating frame 5, which will be described later, an engine 14, an exhaust gas aftertreatment device 17, a urea water tank 19, a tank bracket 21, a receiving container 26, and a drain hose 29.

[0014] The revolving frame 5, which serves as a vehicle body frame, forms a support structure for the upper revolving body 3. The revolving frame 5 includes a bottom plate 6 made of a thick plate extending in the front-rear direction, a left vertical plate 7 and a right vertical plate 8 that are erected on the bottom plate 6 and extend in the front-rear direction at a predetermined interval in the left-right direction, a plurality of overhang beams 9 (only one on the front right side is shown in FIGS. 4 and 6 ) that extend outward in the left-right direction from the bottom plate 6, the left vertical plate 7, and the right vertical plate 8 and are arranged at intervals in the front-rear direction, left side frames (not shown) and right side frames 10 that are located outward in the left-right direction and attached to the tips of the overhang beams 9 and extend in the front-rear direction, a front beam 11 that extends in the left-right direction from the front right corner of the bottom plate 6 toward the front end of the right side frame 10, an inner frame 12 that extends in the front-rear direction along the right vertical plate 8 so as to connect the left end of the overhang beam 9 located on the front right side with the left end of the front beam 11, and an undercover 13 provided on the front right side. A working device 4 is rotatably attached to the left vertical plate 7 and the right vertical plate 8 at a front position thereof.

[0015] The undercover 13 is disposed in a rectangular area on the right front side surrounded by the bottom plate 6 (inner frame 12), the right front overhang beam 9, the right side frame 10, and the front beam 11. In addition to this undercover 13, undercovers (not shown) are disposed at multiple locations between the bottom plate 6 and the left and right side frames 10.

[0016] Here, a tank assembly 18, which will be described later, is mounted on the right front undercover 13. As shown in Figures 6 and 7, the undercover 13 is provided with a plurality of, for example, six, bolt insertion holes 13A that correspond to the screw holes 22D of the mounting base 22 that constitutes the tank bracket 21 of the tank assembly 18. In addition, a hose insertion hole 31, which will be described later, is provided on the front side of the undercover 13, specifically, at a position below a hose fixing portion 30 of the tank bracket 21, which will be described later.

[0017] As shown in Fig. 2, the engine 14 is provided on the rear side of the revolving frame 5. The engine 14 is configured as a diesel engine and is mounted, for example, transversely on the revolving frame 5. The engine 14 is provided with an exhaust pipe 14A for discharging exhaust gas.

[0018] The diesel engine 14 is highly efficient and durable, but emits harmful substances such as nitrogen oxides (NOx) along with the exhaust gas. Therefore, the exhaust gas aftertreatment device 17, which will be described later and is attached to the exhaust pipe 14A, is equipped with a NOx purification device (neither of which is shown) that includes a urea selective reduction catalyst, an oxidation catalyst, etc., that removes nitrogen oxides (NOx).

[0019] The heat exchanger 15 is provided on the left side of the engine 14. The heat exchanger 15 is composed of a radiator that cools the engine coolant, an oil cooler that cools the hydraulic oil, an intercooler that cools the air taken in by the engine 14, and the like. On the other hand, the hydraulic pump 16 is attached to the right side of the engine 14. The hydraulic pump 16 is driven by the engine 14 to discharge the hydraulic oil as pressurized oil.

[0020] The exhaust gas aftertreatment device 17 treats exhaust gas discharged from the engine 14 via an exhaust pipe 14A. The exhaust gas aftertreatment device 17 is disposed, for example, above the hydraulic pump 16 on the right side of the engine 14. The exhaust gas aftertreatment device 17 is equipped with a NOx purification device (not shown). This NOx purification device purifies nitrogen oxides (NOx) in the exhaust gas using urea water (urea aqueous solution) as a reducing agent. The NOx purification device includes a urea selective reduction catalyst, an oxidation catalyst, and a urea injector. The urea injector is connected to a urea water tank 19 (described later) via a hose, a urea water pump, etc. (none of which are shown).

[0021] In this NOx purification device, a urea injector injects urea water into exhaust gas, and ammonia produced from the urea water is used by a urea selective reduction catalyst to reduce NOx in the exhaust gas, breaking it down into water and nitrogen.Then, an oxidation catalyst reduces the ammonia in the exhaust gas, thereby purifying the NOx in the exhaust gas.

[0022] The tank assembly 18 is disposed on the right front side of the revolving frame 5 and is attached to the undercover 13. The tank assembly 18 is configured to include a urea water tank 19, a tank bracket 21, a receiving container 26, and a drain hose 29, which will be described later. The tank assembly 18 is configured such that the urea water tank 19, to which the receiving container 26 and the drain hose 29 are attached, is fixed onto the tank bracket 21, and the tank bracket 21 is attached to the undercover 13 using bolts 25.

[0023] The urea water tank 19 stores urea water as a reducing agent to be supplied to the NOx purification device. The urea water tank 19 is provided in a state of being housed in the right front part of the revolving frame 5, for example.

[0024] The urea water tank 19 is formed as a substantially rectangular parallelepiped container with an enclosed interior space and is disposed so that its length is in the left-right direction. As shown in Figures 4 to 8, the urea water tank 19 includes, for example, a rectangular bottom surface 19A that is elongated in the left-right direction, a front surface 19B extending upward from the front edge of the bottom surface 19A, a rear surface 19C extending upward from the rear edge of the bottom surface 19A, a left side surface 19D extending upward from the left edge of the bottom surface 19A, a right side surface 19E extending upward from the right edge of the bottom surface 19A, and a top surface 19F that closes the upper portions of the front surface 19B, rear surface 19C, left side surface 19D, and right side surface 19E. The front surface 19B, rear surface 19C, left side surface 19D, and right side surface 19E form the circumferential surface of the urea water tank 19.

[0025] The urea water tank 19 has a water filler port 19G for filling the urea water in a front portion of a top surface 19F that slopes downward toward the front. The water filler port 19G is located in the left-right middle of the urea water tank 19 and protrudes from a front surface 19B that forms the circumferential surface of the urea water tank 19. Specifically, the water filler port 19G is located at the corner between the front surface 19B and the top surface 19F and is formed as a short cylinder that protrudes upward from the top surface 19F. For example, a strainer (not shown) for capturing foreign matter contained in the urea water is provided inside the water filler port 19G. The water filler port 19G is closed with a cap 20 except when the urea water is being refilled. The urea water filler port may be located not only at the corner between the front surface and the top surface, but also at the corner between the right side surface and the top surface, on the top surface, or the like.

[0026] Here, the urea water tank 19 according to the first embodiment is disposed so that the longitudinal direction of the approximately rectangular parallelepiped shape is the left-right direction of the revolving frame 5. Therefore, the urea water tank 19 can be efficiently accommodated in the rectangular (oblong) installation space on the right front side surrounded by the front beam 11, the right front overhang beam 9, the inner frame 12, and the right side frame 10. As a result, the urea water tank 19 can be formed large within the limited installation space, and has a sufficient capacity to store the amount of urea water required for long-term operation. The urea water tank can also be disposed so that the longitudinal direction of the approximately rectangular parallelepiped shape is the front-rear direction of the revolving frame.

[0027] The tank bracket 21 is disposed between the undercover 13 of the revolving frame 5 and the urea water tank 19, and attaches the urea water tank 19 to the undercover 13. Here, the tank bracket 21 positions the urea water tank 19 so that a filler port 19G of the urea water tank 19 is located on the front side. As shown in Figures 7 and 8, the tank bracket 21 is configured to include a mounting base 22, a rear support portion 23, etc., which will be described later.

[0028] The mounting base 22, on which the urea water tank 19 is placed, is formed as a rectangular frame-like base. Specifically, the mounting base 22 includes a pair of vertical frame bodies 22A extending in the front-rear direction with a gap between them in the left-right direction, a front horizontal frame body 22B extending in the left-right direction and connecting the front sides of the pair of vertical frame bodies 22A, and a rear horizontal frame body 22C extending in the left-right direction and connecting the rear sides of the pair of vertical frame bodies 22A. A plurality of screw holes 22D, for example, three screw holes 22D each, are provided at intervals in the front-rear direction on the bottom side of the pair of vertical frame bodies 22A.

[0029] Here, the mounting base 22 has a protruding portion 22E on the front surface 19B side, which is the side from which the water filler port 19G protrudes, of the peripheral surface of the urea water tank 19. This protruding portion 22E protrudes laterally beyond the front surface 19B that forms the peripheral surface of the urea water tank 19. A hose fixing portion 30, which will be described later, is provided on the protruding portion 22E, for example, at a position in the middle in the left-right direction corresponding to the water filler port 19G.

[0030] The rear support part 23 extends upward from the rear part of the mounting base 22. The rear support part 23 abuts against the rear surface part 19C of the urea water tank 19. Furthermore, as shown in Fig. 7, two fixing bands 24 are provided on either side of the water filler port 19G, and extend from the front side of the urea water tank 19 along the upper side. First ends on the front (lower) sides of the two fixing bands 24 are attached to the protruding part 22E of the mounting base 22, and second ends on the rear (upper) sides are attached to the upper part of the rear support part 23. As a result, the fixing bands 24 press the urea water tank 19 mounted on the mounting base 22 against the mounting base 22 and the rear support part 23, thereby fixing the urea water tank 19 to the tank bracket 21 and assembling the tank assembly 18.

[0031] The tank assembly 18 assembled in this manner has the tank bracket 21 placed on the undercover 13. In this state, the tank assembly 18 can be attached to the revolving frame 5 by inserting the bolt 25 from below through the bolt insertion hole 13A of the undercover 13 and screwing it into the threaded hole 22D of the mounting base 22.

[0032] Next, the receiving vessel 26, the drain hose 29, the hose fixing portion 30, and the hose insertion hole 31, which are characteristic parts of this embodiment, will be described.

[0033] The receiver 26 is provided so as to surround the water inlet 19G of the urea water tank 19. The receiver 26 includes a receiving portion 27 and a water collection portion 28. The receiver 26 is a tray that receives the urea water spilling from the water inlet 19G when the urea water is poured into the water inlet 19G, and prevents the urea water from spreading to the surrounding area.

[0034] Receptacle 27 is composed of rectangular bottom plate 27A that is larger than water inlet 19G, side plates 27B that extend upward from the rear, left, and right sides of bottom plate 27A, and mounting opening 27C that opens in the center of bottom plate 27A. Mounting opening 27C is a circular hole into which water inlet 19G is inserted, and an elastic, annular sealing member 27D is attached to the inside of mounting opening 27C.

[0035] Receiving portion 27 inserts water pouring port 19G into mounting opening 27C while sealing member 27D tightly contacting the outer peripheral surface of water pouring port 19G. This allows receiving portion 27 to be attached to the periphery of water pouring port 19G by utilizing the elasticity of sealing member 27D. In this case, side plates 27B of receiving portion 27 are arranged to surround water pouring port 19G, and therefore side plates 27B can prevent urea water spilling from water pouring port 19G from further flowing outward. Furthermore, bottom plate 27A is inclined downward and forward by abutting against upper surface portion 19F, and therefore urea water spilled onto bottom plate 27A can flow toward the front where water collecting portion 28 is provided.

[0036] The water collecting section 28 is provided in front of the receiving section 27. The water collecting section 28 collects the urea water flowing forward through the receiving section 27 and supplies it to a drain hose 29. The water collecting section 28 is composed of a pocket 28A that is open on the upper side and has a width dimension equivalent to the width dimension (dimension in the left-right direction) of the receiving section 27, and a hose connection pipe 28B that is provided below the pocket 28A.

[0037] Pocket 28A extends downward from bottom plate 27A, with its lower portion inclined toward the middle in the width direction. Hose connection pipe 28B is disposed in the middle of the lower portion of pocket 28A. This allows water collection section 28 to discharge all of the urea water flowing from receiving section 27 to drain hose 29 connected to hose connection pipe 28B.

[0038] A drain hose 29 serving as a pipe is connected to the receiving container 26 to discharge the urea water. The drain hose 29 is formed of a flexible tubular body that extends linearly in the vertical direction. A base end 29A located at the upper part of the drain hose 29 is connected to a hose connection pipe 28B of the water collection unit 28. Meanwhile, as shown in FIGS. 7 and 8, the drain hose 29 is fixed in a predetermined position by inserting a lower end, which is the tip side, into a hose fixing portion 30 of the mount 22. Furthermore, as shown in FIG. 5, a tip 29B of the drain hose 29 that extends below the mount 22 passes through a hose insertion hole 31 of the undercover 13 and is exposed to the outside.

[0039] A hose fixing portion 30 serving as a pipe fixing portion is provided on the mounting base 22 of the tank bracket 21. The hose fixing portion 30 fixes the drain hose 29. Specifically, the hose fixing portion 30 penetrates the protruding portion 22E of the mounting base 22 in the vertical direction and is formed as a round hole through which the drain hose 29 can be inserted.

[0040] The hose fixing part 30 is disposed below the hose connecting pipe 28B of the water collecting part 28 that constitutes the receiving container 26. This allows the drain hose 29 connected to the hose connecting pipe 28B to pass through the hose fixing part 30 with its lower side kept straight. The straight drain hose 29 allows the urea water to be smoothly discharged. Note that the hose fixing part is not limited to a round hole, and may be configured to clamp the drain hose, for example.

[0041] The hose insertion hole 31, which serves as a pipe insertion hole, is provided in the undercover 13 located on the right front side of the revolving frame 5. The hose insertion hole 31 is formed as a round hole at a position corresponding to the underside of the drain hose 29 fixed by the hose fixing part 30, through which the drain hose 29 passes.

[0042] 7, the hose insertion hole 31 is disposed at a position where the tip 29B of the drain hose 29 fixed in a predetermined position by the hose fixing part 30 passes through (is inserted into) the hose insertion hole 31 when the tank assembly 18 is placed on the undercover 13 in order to attach the tank assembly 18 to the revolving frame 5. Therefore, the tip 29B of the drain hose 29 can be inserted into the hose insertion hole 31 and exposed to the outside simply by placing the tank assembly 18 on the undercover 13 without having to hold or move the drain hose 29 by hand.

[0043] The cab 32 is provided on the left front side of the revolving frame 5. An operator who operates the hydraulic excavator 1 rides in the cab 32. Inside the cab 32, a driver's seat where the operator sits, levers for various operations, pedals, etc. (none of which are shown) are arranged.

[0044] The hydraulic excavator 1 according to the first embodiment has the above-described configuration, and its operation will now be described.

[0045] The operator in the cab 32 starts the engine 14 to drive the hydraulic pump 16. In this state, the operator can move the undercarriage 2 forward or backward by operating the travel levers and the like. In addition, the operator can rotate the working device 4 to perform work such as excavating earth and sand by operating the work levers.

[0046] When the engine 14 is operating, exhaust gas containing nitrogen oxides (NOx), a harmful substance, is emitted from the exhaust pipe 14A. At this time, urea water in the urea water tank 19 is supplied to the urea injector of the NOx purification device using a urea water pump. At this time, the NOx purification device injects urea water from the urea injector into the exhaust gas to produce ammonia. As a result, the urea selective reduction catalyst reduces nitrogen oxides to water and nitrogen, which are then discharged to the outside via the oxidation catalyst, thereby reducing the amount of nitrogen oxide emissions.

[0047] Next, the procedure for assembling the tank assembly 18 and the procedure for fixing the tank assembly 18 to the revolving frame 5 will be described.

[0048] First, we will explain the assembly procedure for the tank assembly 18. The urea water tank 19 is placed on the mounting base 22. In this state, the front sides (lower sides) of the two fixing bands 24 are attached to the mounting base 22, and the rear sides (upper sides) are attached to the top of the rear support part 23, thereby fixing the urea water tank 19 to the mounting base 22.

[0049] Next, the process moves on to the installation of the receiving container 26 and the drain hose 29. In this installation, the water inlet 19G is inserted into the installation opening 27C of the receiving portion 27, and the seal member 27D is brought into close contact with the outer peripheral surface of the water inlet 19G to secure it in place. After the receiving container 26 is installed around the water inlet 19G, the upper base end 29A of the drain hose 29 is connected to the hose connection pipe 28B of the receiving portion 27, and the lower end of the drain hose 29 is inserted into the hose fixing portion 30 of the mounting base 22. This completes the assembly of the tank assembly 18. In this state, the tip 29B of the drain hose 29 protrudes downward from the hose fixing portion 30.

[0050] Once the tank assembly 18 is assembled, the tank bracket 21 is placed on the undercover 13, and the bolts 25 inserted into the bolt insertion holes 13A of the undercover 13 are screwed into the threaded holes 22D of the mounting base 22. This allows the tank assembly 18 to be attached to the revolving frame 5. Furthermore, with the tank assembly 18 attached to the revolving frame 5, the tip 29B of the drain hose 29 can be exposed to the outside through the hose insertion hole 31 of the undercover 13.

[0051] On the other hand, when refilling the urea water tank 19 with urea water, the cap 20 is removed to open the water inlet 19G, and the water supply nozzle is inserted into the water inlet 19G to inject the urea water. During this urea water refilling operation, if the urea water is discharged from the water supply nozzle with a strong force or if the urea water splashes against a strainer or the like provided in the water inlet 19G, the urea water may spill out from the water inlet 19G onto the surrounding area.

[0052] According to this embodiment, the urea water tank 19, which stores urea water and has an upwardly opening water inlet 19G for injecting urea water, is provided with a receiving container 26 surrounding the water inlet 19G, and a drain hose 29 for discharging urea water is connected to the receiving container 26. A tank bracket 21 for attaching the urea water tank 19 to the swivel frame 5 is provided with a hose fixing portion 30 for fixing the drain hose 29.

[0053] Therefore, if the urea water spills from the water inlet 19G, the receiver 26 surrounding the water inlet 19G receives the spilled urea water, thereby preventing the urea water from spilling out to the surrounding area. In addition, the urea water received by the receiver 26 can be discharged to the outside of the upper rotating body 3 through the drain hose 29.

[0054] As a result, in this embodiment, the cleaning work for cleaning the urea water spilled from the water filling port 19G can be omitted, thereby improving workability. In addition, corrosion caused by adhesion of the urea water can be suppressed, thereby improving durability and reliability.

[0055] Here, the urea solution tank 19 is formed to have a large capacity so that the hydraulic excavator 1 can operate for a long period of time. That is, the urea solution tank 19 is formed large enough to approach the front beam 11, the right front overhang beam 9, the inner frame 12, and the right side frame 10. Therefore, it is difficult to secure a working space around the urea solution tank 19 for routing the drain hose 29.

[0056] In contrast, the tank bracket 21 is provided with a hose fixing portion 30 for fixing the drain hose 29, so the drain hose 29 can be fixed in a predetermined position by the hose fixing portion 30 before the tank bracket 21 and the urea water tank 19 are attached to the revolving frame 5. As a result, the time-consuming task of routing the drain hose 29 can be omitted, improving the workability during assembly. In other words, the drain hose 29 can be easily routed through places where it is difficult to route the drain hose 29. Furthermore, the urea water tank 19 can be made larger without regard to the space required for routing the drain hose 29, and the capacity can also be further increased.

[0057] Furthermore, the swivel frame 5 is provided with a hose insertion hole 31 through which the drain hose 29 passes, at a position corresponding to the tip 29B of the drain hose 29 fixed by the hose fixing part 30. As a result, by simply placing the urea water tank 19 and the tank bracket 21 on the swivel frame 5 (undercover 13), the tip 29B of the drain hose 29 can be inserted into the hose insertion hole 31 and exposed to the outside. In this respect as well, the ease of assembly can be improved.

[0058] In addition, the mounting base 22 of the tank bracket 21 has a protruding portion 22E that protrudes from the peripheral surface of the urea water tank 19, and the hose fixing portion 30 is provided on the protruding portion 22E. This allows the drain hose 29 to be easily fixed to the hose fixing portion 30 provided on the protruding portion 22E.

[0059] Furthermore, the water filler port 19G is provided on the urea water tank 19 so as to protrude from the circumferential surface of the urea water tank 19, and the protruding portion 22E is provided on the side of the circumferential surface of the urea water tank 19 from which the water filler port 19G protrudes. Therefore, the receiving container 26 attached to the water filler port 19G and the hose fixing portion 30 provided on the protruding portion 22E are positioned at a short distance in the vertical direction, so that the drain hose 29 can be made short. This not only makes it easier to route the drain hose 29, but also prevents the drain hose 29 from becoming clogged.

[0060] Next, Fig. 10 shows a second embodiment of the present invention. The feature of this embodiment is that the tube includes a portion that extends laterally, and the tip of the tube is exposed to the outside of the body frame. In the second embodiment, the same components as those in the first embodiment described above are assigned the same reference numerals, and their description will be omitted.

[0061] 10, drain hose 41 as a pipe according to the second embodiment is made of a flexible tubular body, similar to drain hose 29 according to the first embodiment, and is connected to receiving container 26. However, drain hose 41 according to the second embodiment differs from drain hose 29 according to the first embodiment in that it has vertical pipe portion 41A and horizontal pipe portion 41B, which will be described later.

[0062] The drain hose 41 includes a portion that extends laterally. Specifically, the drain hose 41 includes a vertical pipe portion 41A that extends downward (vertically) from the receiving container 26 and a horizontal pipe portion 41B that extends laterally (rearward) from the lower end of the vertical pipe portion 41A. The vertical pipe portion 41A has a base end 41C located at the upper portion connected to the hose connection pipe 28B of the receiving portion 27, and a lower portion inserted into the hose fixing portion 30 of the mounting base 22, thereby being fixed in place. Meanwhile, the horizontal pipe portion 41B extends rearward using the gap between the mounting base 22 and the undercover 13, and opens at a position beyond the undercover 13 as a tip 41D. Therefore, the tip 41D of the horizontal pipe portion 41B of the drain hose 41 is exposed to the outside of the revolving frame 5 (upper revolving body 3). The drain hose 41 can discharge the urea water received in the receiving vessel 26 to the outside of the upper rotating body 3 from the tip 41D through the vertical pipe portion 41A and the horizontal pipe portion 41B.

[0063] Thus, the second embodiment configured as described above can also achieve substantially the same effects as the first embodiment. In particular, according to the second embodiment, the horizontal pipe section 41B can be freely extended in the horizontal direction, so the position of the tip 41D, which is the discharge position for the urea water, can be appropriately set.

[0064] In the first embodiment, the urea water tank 19 is disposed on the right front side of the revolving frame 5. However, the present invention is not limited to this, and the urea water tank may be disposed on the left side, rear side of the revolving frame. This configuration can be similarly applied to the second embodiment.

[0065] In each embodiment, a crawler-type hydraulic excavator 1 has been described as an example of construction machinery. However, the present invention is not limited to this and may be applied to a wheel-type hydraulic excavator. In addition, the present invention may be widely applied to other construction machinery such as hydraulic cranes and wheel loaders. [Explanation of symbols]

[0066] 1. Hydraulic excavator (construction machinery) 2 Undercarriage (car body) 3 Upper rotating body (car body) 5 Swing frame (body frame) 13 Undercover 19. Urea tank 19B Front part (periphery) 19C Rear part (periphery) 19D Left side part (periphery) 19E Right side part (periphery) 19G water inlet 21 Tank bracket 22 Mounting base 22E Projection 26 Receptacle 29,41 Drain hose (pipe body) 29B,41D tip 30 Hose fixing part (tube fixing part) 31 Hose insertion hole (pipe insertion hole) 41B Horizontal pipe section

Claims

1. a body frame forming a support structure for the body; a urea water tank that stores urea water and has an inlet that opens upward and through which the urea water is injected; a tank bracket disposed between the vehicle body frame and the urea water tank, the tank bracket attaching the urea water tank to the vehicle body frame; In a construction machine comprising: The urea water tank is provided with a receiving container surrounding the water inlet, A pipe for discharging urea water is connected to the receiving container, A construction machine characterized in that the tank bracket is provided with a pipe fixing portion for fixing the pipe.

2. The construction machine according to claim 1, A construction machine characterized in that the vehicle frame has a pipe insertion hole through which the pipe passes at a position corresponding to the tip side of the pipe fixed by the pipe fixing portion.

3. The construction machine according to claim 1, the tube includes a laterally extending portion; A construction machine characterized in that the tip of the pipe body is exposed to the outside of the body frame.

4. The construction machine according to claim 1, the tank bracket has a protruding portion protruding from a peripheral surface of the urea water tank, A construction machine characterized in that the pipe fixing portion is provided on the protruding portion.

5. The construction machine according to claim 4, the water inlet is provided in the urea water tank and protrudes from a peripheral surface of the urea water tank, The construction machine is characterized in that the protrusion is provided on the side of the circumferential surface of the urea water tank from which the water inlet protrudes.

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