Construction machine

Abstract

To provide a construction machine that can improve maintainability of a liquid agent tank placed inside a counterweight.SOLUTION: A hydraulic shovel 1 has: a self-propelled lower running body 2; an upper rotating body 3 rotatably mounted on the lower running body 2; a front device 4 provided at a front side of the upper rotating body 3 so as to be able to move up and down; and a counterweight 20 provided at a rear of the upper rotating body 3. The counterweight 20 has: a storage recess 31 formed on an outer surface (a surface of a rear surface 20A) of the counterweight 20; a urea tank 51 stored inside the storage recess 31 and storing a liquid agent to be supplied to an exhaust purification device 14 arranged in front of the counterweight 20; and a bracket 38 which abuts against the urea tank 51 stored in the storage recess 31 so as to press the urea tank 51 against the storage recess 31 from the outside of the upper rotating body 3 and which holds the urea tank 51 within the storage recess 31.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a construction machine equipped with a counterweight on an upper rotating body. [Background technology]

[0002] Patent Document 1 discloses an arrangement structure for a liquid reducing agent tank for a NOx reduction catalyst on a construction machine, the arrangement including a counterweight mounted on a body frame, a liquid reducing agent tank storage space provided inside the counterweight and having an opening provided in a rear panel or an upper panel constituting the counterweight, a tank storage chamber separated from a weight adjustment material filled in the counterweight by a partition member provided in the tank storage space, a lid member that can open and close the tank storage chamber, a liquid reducing agent tank provided in the tank storage chamber, and a fixing means between the tank storage chamber and the liquid reducing agent tank. The patent document also discloses a fixing means for fixing the liquid reducing agent tank to the tank storage box by fitting protrusions extending in the longitudinal direction on the bottom surface and three outer surfaces (front and rear) of the tank storage box with recesses provided in the longitudinal direction on the bottom surface and three outer surfaces (front and rear) of the inner surface of the tank storage box so as to correspond to the protrusions. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-250168 Summary of the Invention [Problem to be solved by the invention]

[0004] There are cases where it is necessary to remove the tank located inside the counterweight during tank maintenance, etc. However, in Patent Document 1, during maintenance, it is necessary to open the lid member and then insert or remove the liquid reducing agent tank while checking the fit between the convex portion and the concave portion extending in the longitudinal direction, which is time-consuming. Furthermore, if an attempt is made to forcibly insert the liquid reducing agent tank when the convex portion and the concave portion are misaligned, there is a risk that the fixing means will be damaged.

[0005] The present invention has been made in consideration of the above circumstances, and its object is to provide a construction machine that can improve the maintainability of a liquid agent tank placed inside a counterweight. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention provides a construction machine having a self-propelled lower running body, an upper rotating body rotatably mounted on the lower running body, a front device mounted on the front side of the upper rotating body so as to be able to move up and down, and a counterweight mounted on the rear of the upper rotating body, wherein the counterweight has a storage recess formed on the outer surface of the counterweight, a liquid agent tank stored inside the storage recess for storing a liquid agent to be supplied to equipment arranged in front of the counterweight, and a holding member that abuts against the liquid agent tank stored in the storage recess so as to press the liquid agent tank stored in the storage recess against the storage recess from the outside of the upper rotating body, and holds the liquid agent tank within the storage recess. [Effects of the Invention]

[0007] According to the present invention, it is possible to improve the ease of maintenance of the liquid agent tank disposed inside the counterweight. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view showing the structure of a hydraulic excavator according to an embodiment of the present invention, viewed from the right rear side. FIG. [Figure 2] FIG. 1 is a side view showing the structure of a hydraulic excavator. [Figure 3] FIG. 2 is a cross-sectional view taken along the line III-III in FIG. [Figure 4] FIG. 2 is a partially enlarged perspective view showing the periphery of a bracket in FIG. [Figure 5] FIG. 5 is a vertical cross-sectional view taken along the VV section in FIG. 4. [Figure 6] FIG. 10 is a view showing the storage recess from the rear side. [Figure 7] FIG. 10 is an exploded perspective view illustrating a urea tank unit and a bracket housed in the counterweight. [Figure 8] FIG. 2 is a perspective view showing the overall structure of the urea tank. [Figure 9] FIG. 10 is an enlarged perspective view of the periphery of a bracket in a modified example in which the end surface on the liquid inlet side of the urea tank is flat. [Figure 10] FIG. 10 is a cross-sectional view taken along line XX in FIG. 9. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of a construction machine according to the present invention will be described in detail with reference to the accompanying drawings, taking as an example a case where the construction machine is applied to a hydraulic excavator 1.

[0010] In the following description, the up-down, front-rear, and left-right directions correspond to the directions of arrows appropriately shown in each drawing, such as Fig. 1. In other words, the illustrated "up," "down," "front," "rear," "left," and "right" correspond to the up-down, left-right, and front-rear directions as seen by an operator seated in a cab 7 (described below).

[0011] <Overall structure of hydraulic excavator> The hydraulic excavator 1 is used, for example, at work sites such as civil engineering, demolition, underground construction, etc. In this example, the hydraulic excavator 1 is a small hydraulic excavator (for example, machine weight is about 1 to 6 tons) suitable for work in a narrow work site.

[0012] As shown in FIGS. 1 and 2, the vehicle body of the hydraulic excavator 1 has a self-propelled crawler-type lower traveling body 2 and an upper rotating body 3 mounted on the lower traveling body 2 so as to be able to rotate.

[0013] <Upper rotating body> The upper rotating body 3 has a rotating frame 5 as a vehicle body frame at its front. The rotating frame 5 is rotatably attached to the lower traveling body 2 via a slewing ring 6. The rotating frame 5 has a cylindrical swing bracket 5A at its front end. The rotating frame 5 has a cab 7 on its left front side that defines the operator's compartment.

[0014] The upper rotating body 3 has a front device 4 on its front side that is mounted so as to be able to move up and down. The front device 4 has a swing post 4A on its base end side. This swing post 4A is connected to a swing bracket 5A of the rotating frame 5 so as to be able to swing left and right. As a result, the front device 4 is attached to the upper rotating body 3 so as to be able to swing left and right and move up and down in the vertical direction, and is used to perform excavation work of earth and sand, etc.

[0015] The upper rotating body 3 also has an engine 11 as a prime mover, located on the rotating frame 5 and in front of a counterweight 20 (described later). As shown in FIG. 3, the engine 11 is disposed in an engine compartment 10 and is mounted horizontally extending in the left-right direction. A fan unit 12 that generates airflow in a required direction and a muffler 13 that discharges exhaust gas from the engine 11 to the outside are disposed adjacent to the engine 11. The upper rotating body 3 also has an exhaust purification device 14 (aftertreatment device) for purifying exhaust gas emitted as the engine 11 is driven. This exhaust purification device 14 is a known urea SCR (Selective Catalytic Reduction) device that reduces NOx (nitrogen oxides) in the exhaust gas using a urea solution stored in a urea tank 51 (described later).

[0016] Furthermore, the upper rotating body 3 has a prime mover cover 17 that covers the engine 11 from the rear and above, and an exterior cover 16 that covers the engine compartment 10 that houses a hydraulic pump, a heat exchanger, and the like (none of which are shown), including the engine 11. The exterior cover 16 is made up of a left side cover 16A that covers the engine compartment 10 from the left side, a right side cover 16B that covers the engine compartment 10 from the right side, and a top cover 16C that is disposed so as to surround a top plate 18 of the prime mover cover 17 and covers the engine compartment 10 from above.

[0017] <Counterweight> A counterweight 20 is provided at the rear of the revolving frame 5 of the upper revolving body 3 to balance the weight with the front device 4. As shown in FIG. 3, the counterweight 20 has an outer surface (surface of the rear surface 20A) that is curved in a substantially arc shape in a plan view, and is made of a casting that is integrally formed as a heavy object extending in the left-right direction.

[0018] 1 and 3, the counterweight 20 has a left weight portion 21, a right weight portion 22, a lower weight portion 23, and an inspection opening 25. The left weight portion 21 is located on the left side of the counterweight 20 and rises upward from the revolving frame 5. The right weight portion 22 is located on the right side of the counterweight 20 and rises upward from the revolving frame 5. The lower weight portion 23 is located below the counterweight 20 and connects the lower sides of the left weight portion 21 and the right weight portion 22.

[0019] The inspection opening 25 is formed in an area surrounded by the left weight portion 21, the right weight portion 22, and the lower weight portion 23. That is, the inspection opening 25 is a rectangular opening formed in the center of the counterweight 20 in the left-right direction, and is opened and closed by the prime mover cover 17. When the prime mover cover 17 is moved to the open position, inspection work can be performed on the on-board equipment inside the engine compartment 10, such as the engine 11, through the inspection opening 25 of the counterweight 20. As shown in FIG. 3 , the counterweight 20 is disposed behind the engine compartment 10 on the upper rotating body 3, and its inner surface (the surface of the front surface 20B) faces the engine compartment 10.

[0020] As shown in Figures 3, 4, and 5, a storage recess 31 and an attachment recess 35 are arranged in this order from the front surface 20B to the rear surface 20A of the counterweight 20 near the boundary between the right weight portion 22 and the lower weight portion 23.

[0021] <Storage recess> The storage recess 31 is provided at the rear of the counterweight 20 and is a recess formed in the outer surface (surface of the rear surface 20A) of the counterweight 20 so as to open toward the rear side of the upper rotating body 3. A communication hole 151 is formed in the counterweight 20 on the front side of the storage recess 31. As shown in FIGS. 3 and 5, the communication hole 151 communicates between the storage recess 31 and the inner surface of the counterweight 20 (the surface of the front face 20B). In other words, the storage recess 31 and the communication hole 151 penetrate the counterweight 20 from the outer end 31A (rear end) on the rear face 20A side to the inner end 31B (front end) on the front face 20B side. In this example, the storage recess 31 and the communication hole 151 are located on the right side, which is the same side as the exhaust purification device 14, in the left-right direction of the upper rotating body 3. The storage recess 31 also has a tapered portion 31C that narrows in diameter from the outer surface (the surface of the rear surface 20A of the counterweight 20) to the inner surface (the surface of the front surface 20B of the counterweight 20), a constant-diameter portion 31D located in front of the tapered portion 31C, and a fitting portion 31E that protrudes upward from the tapered portion 31C and has a non-penetrating recess shape. In this embodiment, the storage recess 31 having such a structure stores a urea tank unit 50 that stores a liquid agent to be supplied to equipment located in front of the counterweight 20 (in this example, a urea aqueous solution to be supplied to the exhaust purification device 14).

[0022] <Mounting recess> 3, 4, and 5, the mounting recess 35 has a substantially rectangular outer edge to which a bracket 38 (holding member) is attached. As shown in FIGS. 6 and 7, the mounting recess 35 is formed at the outer end 31A of the storage recess 31, and has four bolt holes 36.

[0023] <bracket> Normally, the storage recess 31 is covered by a bracket 38 that is arranged to fit into the mounting recess 35, as shown in Fig. 4. The bracket 38 is, for example, a flat metal plate, and has a through-hole 39 cut out in the shape of a round hole for passing a liquid filling port 53 and a cap 54 (described later). As shown in Fig. 7, the bracket 38 has bolt holes 41 at its four corners, and is detachably attached to the mounting recess 35 by bolts 42 (fasteners).

[0024] <Urea tank unit> As shown in Figures 3 and 5, the urea tank unit 50 is removably stored inside the storage recess 31 and has a urea tank 51 (liquid agent tank) that stores a urea aqueous solution (liquid agent) that is led to the exhaust purification device 14, and a liquid guide hose 55 that connects to the exhaust purification device 14.

[0025] <Urea tank> 5 and 8, the urea tank 51 is a tank made of, for example, resin, having a tapered shape that decreases in diameter from a liquid-injection-side end face 51A to a discharge-side end face 51B. The urea tank 51 has a tapered shape that contacts the tapered portion 31C of the storage recess 31 when stored inside the storage recess 31. At this time, as shown in FIG. 5, the bracket 38 abuts against the urea tank 51 stored in the storage recess 31 so as to press the urea tank 51 against the storage recess 31 from the outside of the upper rotating body 3, thereby holding the urea tank 51 in the storage recess 31. In detail, the liquid-injection-side end face 51A of the urea tank 51 is provided with a flat surface 59 located on the rear side of the upper rotating body 3 when the urea tank is housed in the storage recess 31, and a protrusion 52 adjacent to the flat surface 59 for abutting against the bracket 38. When the urea tank 51 is housed inside the storage recess 31, the protrusion 52 of the liquid-injection-side end face 51A abuts against the bracket 38, and the outer peripheral surface 51C abuts against the inner peripheral surface of the tapered portion 31C provided in the storage recess 31, so that the urea tank 51 is securely held inside the storage recess 31. In other words, the urea tank 51 can be held by being sandwiched between the bracket 38 and the counterweight 20.

[0026] Furthermore, the urea tank 51 has a liquid filling port 53 on the upper side of the liquid filling side end face 51A side for filling the urea aqueous solution into the urea tank 51. The liquid filling port 53 is configured so that an end 53A protrudes beyond the liquid filling side end face 51A (so that it is located on the rear side when stored in the storage recess 31), and is disposed so that the end 53A is exposed to the outside of the counterweight 20 when the urea tank 51 abuts against the bracket 38 and is held in the storage recess 31. The liquid filling port 53 fits into a fitting portion 31E of the storage recess 31, thereby also functioning as a rotation stopper for the urea tank 51 relative to the storage recess 31. The liquid filling port 53 is normally closed with a removable cap 54, and when filling, the urea aqueous solution is poured by removing the cap 54.

[0027] The urea tank 51 having the above configuration is inserted from the outer end 31A (rear opening) of the storage recess 31, and is stored in the storage recess 31 so that the inlet end face 51A is located on the outer end 31A side of the storage recess 31 and the discharge end face 51B is located on the inner end 31B side (front opening side) of the storage recess 31. When stored in the storage recess 31, the rear face of the urea tank 51 (more specifically, the inlet end face 51A including the convex portion 52 and the end 53A of the inlet 53) is formed along the outer surface (surface of the rear face 20A) of the counterweight 20 described above, as shown in Fig. 3. This prevents the rear ends of the urea tank 51 and the inlet 53 from protruding from the rear face 20A of the counterweight 20 and interfering with the surroundings.

[0028] <Liquid guide hose> The liquid guide hose 55 is inserted into the urea tank 51 from the discharge end surface 51B of the urea tank 51, and guides the urea aqueous solution to the exhaust purification device 14. As shown in FIG. 3, the liquid guide hose 55 is connected to the pump unit 15, and the urea aqueous solution is discharged by the pump unit 15 at a required timing.

[0029] At this time, the counterweight 20 is provided with a hose fixing bracket 26 (hose fixing device) that fixes the liquid guide hose 55 inside the storage recess 31. When the urea tank unit 50 is stored inside the storage recess 31, the discharge side end surface 51B (rear portion) of the urea tank 51 is connected to the liquid guide hose 55 stably fixed to the hose fixing bracket 26.

[0030] <Effects of the embodiment> In the present embodiment configured as described above, a storage recess 31 is provided inside the counterweight 20 on the outer surface (surface of the rear surface 20A) of the counterweight 20. A urea tank 51 containing a urea solution is stored inside this storage recess 31. The bracket 38 abuts against the urea tank 51 so as to press it against the storage recess 31 from the outside of the upper rotating body 3, thereby holding the urea tank 51 inside the storage recess 31. When refilling, urea can be easily done by removing only the cap 54, without removing the bracket 38 or the urea tank 51.

[0031] In this way, by using a structure in which the bracket 38 holds down the urea tank 51 stored in the storage recess 31, the urea tank 51 can be easily removed from the storage recess 31 by removing the bracket 38 during maintenance. Furthermore, after maintenance, it is sufficient to place the urea tank 51 back into the storage recess 31 and hold it down with the bracket 38. Therefore, according to this embodiment, it is possible to improve the ease of maintenance of the urea tank 51 placed inside the counterweight 20. Specifically, for example, in a typical urea tank storage structure, it is necessary to remove the exterior cover and then release the bands (or brackets, etc.) that secure the tank. Alternatively, it is possible to secure the tank with a band (or bracket, etc.) while leaving the tank itself exposed, but if it is placed on the outer surface where maintenance is easier, it is prone to being hit and may be damaged. In contrast to this, according to this embodiment, the urea tank 51 can be attached or detached simply by removing the bracket 38, which corresponds to the exterior cover. Furthermore, the urea tank 51 can also be protected.

[0032] Furthermore, by disposing the urea tank 51 inside the storage recess 31 made of cast metal, even if the urea tank 51 is made of resin, the counterweight 20 itself acts as a heat insulator and can suppress the adverse effects on the urea aqueous solution of heat from heat-generating parts such as the engine 11. Furthermore, by disposing the urea tank 51 inside the counterweight 20, space that is not normally used can be effectively utilized, and it is also possible to omit providing a separate space for disposing the urea tank 51.

[0033] Furthermore, particularly in this embodiment, the storage recess 31 is provided at the rear of the counterweight 20 and opens toward the rear of the upper rotating body 3, and the urea tank 51 is inserted from the outer end 31A of the storage recess 31. This allows the urea tank 51 to be disposed at (or in the vicinity of) the rearmost part of the upper rotating body 3 as described above, and the urea tank 51 can be placed farther away from heat-generating parts such as the engine 11, thereby preventing adverse effects of heat on the urea aqueous solution.

[0034] Furthermore, particularly in this embodiment, a storage recess 31 is provided at the rear of the counterweight 20 on the right side, which is the same side as the exhaust purification device 14, in the left-right direction of the upper rotating body 3. This allows the exhaust purification device 14 to be closer to the urea tank 51, shortens the length of the hose routed inside the engine compartment 10, and suppresses the thermal impact that the urea water inside the hose receives inside the engine compartment.

[0035] Furthermore, particularly in this embodiment, the storage recess 31 includes the tapered portion 31C, and the urea tank 51 is inserted and removed from the larger-diameter side of the tapered portion 31C, thereby enabling smooth and easy removal of the urea tank 51 during maintenance and installation of the urea tank 51 after maintenance. Furthermore, when the urea tank 51 is sandwiched between the counterweight 20 and the bracket 38, the tapered portion 31C and the urea tank 51 come into surface contact with each other, thereby enabling stable holding. In particular, since the tapered portion 31C and the urea tank 51 come into contact with each other in both the vertical and horizontal directions at an angle relative to the pushing direction of the bracket 38, the urea tank 51 can be simultaneously restrained not only in the approximately front-to-rear direction, which is the pushing direction of the bracket 38, but also in both the vertical and horizontal directions. In other words, the urea tank 51 can be prevented from moving and being damaged due to strong vibrations generated by the hydraulic excavator 1 during operation.

[0036] In this embodiment in particular, the urea tank 51 has a liquid filling port 53, and the bracket 38 has a penetrated portion 39 through which the liquid filling port 53 penetrates and is exposed. This allows the urea tank 51 to be refilled with urea aqueous solution through the liquid filling port 53 while the urea tank 51 is held by the bracket 38 and in the storage recess 31. Furthermore, the urea tank 51 is configured so that the inlet 53 fits into the fitting portion 31E of the storage recess 31. This prevents the urea tank 51 from rotating within the storage recess 31, as would be the case if the urea tank 51 were simply cylindrical or inverted conical, and the fitting portion 31E can function as a so-called anti-rotation device.

[0037] Furthermore, in this embodiment in particular, as described above, the rear surface of the urea tank 51 when stored in the storage recess 31 is formed along the surface of the rear surface 20A of the counterweight 20. This prevents the rear ends of the urea tank 51 from protruding from the rear surface 20A of the counterweight 20 and interfering with the surroundings.

[0038] Furthermore, in this embodiment in particular, the urea tank 51 stored in the storage recess 31 is connected to the liquid guide hose 55 fixed by the hose fixing bracket 26 inside the storage recess 31, so that the urea aqueous solution in the urea tank 51 can be reliably guided to the exhaust purification device 14, thereby purifying the exhaust gas of the engine 11.

[0039] Furthermore, particularly in this embodiment, the counterweight 20 is provided with the mounting recess 35, so that the urea tank 51 can be stored in the storage recess 31 and held in place by the bracket 38, and the bracket 38 can then be attached to the mounting recess 35 with the bolts 42. At this time, the bracket 38 is positioned within the mounting recess 35, which prevents the bracket 38 from protruding from the rear surface 20A of the counterweight 20 and interfering with the surrounding area. Also, the bracket 38 can be easily removed by simply loosening the bolts 42, and the urea tank 51 can be taken out of the storage recess 31.

[0040] In this embodiment, the urea tank 51 is made of resin and has a protrusion 52 for contacting the bracket 38. The urea tank 51 may expand and deform due to expansion caused by freezing of the urea water inside the tank 51. In contrast, in this embodiment, the urea tank 51 has the convex portion 52, so that even if the urea tank 51 expands and deforms as described above, a gap is formed between the flat surface 59 and the bracket 38 while the urea tank 51 is held in the storage recess 31 by the bracket 38. This makes it possible to maintain the tank shape while allowing the urea tank 51 to expand and deform.

[0041] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit and technical concept of the present invention. Such modifications will be described below in order. The same reference numerals will be used to designate parts equivalent to those in the above-described embodiment, and descriptions will be omitted or simplified as appropriate.

[0042] (1) When the end face of the urea tank on the liquid inlet side is made flat Fig. 9 is a partially enlarged perspective view showing the periphery of a bracket in a hydraulic excavator 1 of this modified example, and is a view corresponding to Fig. 4 above. Fig. 10 is a vertical cross-sectional view along cross section XX in Fig. 9, and is a view corresponding to Fig. 5 above. As shown in Figs. 9 and 10, in this modified example, unlike the above embodiment, the liquid-pouring side end surface 51A of the urea tank 51 is a flat surface without a protrusion 52. In addition, a recess 38A is provided on the front side of the bracket 38 so as to abut against the liquid-pouring side end surface 51A.

[0043] In this modified example, the same effects as those of the above embodiment are obtained.

[0044] (2) Other In the above description, a urea tank has been used as an example of a liquid agent tank, but the present invention is not limited to this. For example, the present invention may be applied to a washer fluid tank, a cooling water tank for a motor such as an engine, etc. In these cases, the same effects as those described above can be obtained.

[0045] <About the problem to be solved and the effects of the invention> The problems to be solved by the invention and the effects of the invention are not limited to those described above. That is, the present invention may solve problems or achieve effects not described above, or may solve only some of the problems or achieve only some of the effects described above.

[0046] <About shape, numbers, structure, and time series> The components illustrated in the embodiments and drawings may be modified and improved as desired within the scope of the technical concept of the present invention in terms of shape, numerical value, or the structure or chronological relationship of multiple components.

[0047] In addition to the above, the methods according to the above embodiments and modifications may be used in appropriate combination.

[0048] Although not specifically illustrated, the present invention can be implemented with various modifications within the scope of the invention. [Explanation of symbols]

[0049] 1. Hydraulic excavator (construction machinery) 2 Undercarriage 3 Upper rotating body 4 Front device 5 Swivel frame 10 Engine Room 11 Engine 14 Exhaust gas purification device 20 Counterweight 20A Rear surface (outer surface) 20B Front (inner surface) 26 Hose fixing bracket (hose fixing device) 31 Storage recess 31A Outer edge 31B Inner edge 31E Mating part 35 Mounting recess 38 Bracket (holding member) 39 Penetrated part 42 Bolts (fasteners) 51 Urea tank (liquid agent tank) 51A Liquid injection side end surface (rear surface) 52 Convex part (rear side) 53 Filling port 55 Liquid guide hose 59 Flat surface 151 Communication hole

Claims

1. a self-propelled lower traveling body; an upper rotating body rotatably mounted on the lower traveling body; a front device provided on the front side of the upper rotating body so as to be able to move up and down; a counterweight provided at the rear of the upper rotating body; In construction machinery having The counterweight is a storage recess formed on an outer surface of the counterweight; a liquid agent tank that is housed inside the housing recess and stores a liquid agent to be supplied to equipment disposed in front of the counterweight; a holding member that abuts against the liquid agent tank stored in the storage recess so as to press the liquid agent tank against the storage recess from the outside of the upper rotating body, and holds the liquid agent tank in the storage recess; have Construction machinery characterized by:

2. 2. The construction machine according to claim 1, The storage recess is The counterweight is provided at the rear of the counterweight and is open toward the rear of the upper rotating body. Construction machinery characterized by:

3. 3. The construction machine according to claim 2, an engine room provided on the upper rotating body and arranged forward of the counterweight; an engine housed in the engine compartment; an exhaust purification device housed in the engine compartment and supplying a reducing agent to exhaust gas discharged from the engine; Equipped with The exhaust purification device is disposed inside the engine compartment on one side of the upper rotating body in the left-right direction, the counterweight is provided so that its inner surface faces the engine compartment, The counterweight has a communication hole that communicates the storage recess and the inner surface of the counterweight, The storage recess and the communication hole are The counterweight is provided on the same side as the exhaust purification device in the left-right direction of the upper rotating body. Construction machinery characterized by:

4. 3. The construction machine according to claim 2, The storage recess is The counterweight has a tapered shape whose diameter decreases from the outer surface side of the counterweight to the inner surface side of the counterweight, The counterweight has a communication hole that communicates the storage recess and the inner surface of the counterweight. Construction machinery characterized by:

5. 3. The construction machine according to claim 2, The liquid agent tank includes: a liquid pouring port that is exposed to the outside of the counterweight when the counterweight is held in the storage recess by being in contact with the holding member; The holding member is a pierced portion through which the liquid inlet passes, The storage recess is A fitting portion is provided to fit the liquid inlet. Construction machinery characterized by:

6. 6. The construction machine according to claim 5, The outer surface of the counterweight has a substantially arc-shaped shape in a plan view, The liquid agent tank includes: When housed in the storage recess, the rear surface located on the rear side of the upper rotating body is formed along the outer surface of the counterweight Construction machinery characterized by:

7. 2. The construction machine according to claim 1, The counterweight is a mounting recess for mounting a holding member that abuts against and holds the liquid agent tank; The holding member is The device is removably attached to the mounting recess by a fastener. Construction machinery characterized by:

8. The construction machine according to claim 7, The liquid agent tank is made of resin, and a flat surface located on the rear side of the upper rotating body when housed in the housing recess, and a convex portion adjacent to the flat surface for contacting the holding member, A gap is formed between the flat surface of the liquid agent tank and the holding member when the liquid agent tank is held in the storage recess by the holding member. Construction machinery characterized by:

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