JP2015048768A - Construction machine including urea water tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction machine including a urea water tank which inhibits urea water stored therein from leaking to an exterior part of the tank connected therewith through a breather pipe.SOLUTION: A construction machine 1 includes a urea water tank 40 that stores urea water. The construction machine 1 includes: the urea water tank 40 including a bottom surface part 41, an upper surface part 42, and a side surface part 43 provided between the bottom surface part 41 and the upper surface part 42; a water supply port 48 which is provided at the side surface part 43 of the urea water tank 40 so that a gas phase part A for absorbing an expansion portion formed by the urea water being frozen is formed in the urea water tank 40; a breather pipe 60 where a tip part penetrates through the upper surface part 42 of the urea water tank 40, the breather pipe 60 extending to the oblique lower side in the gas phase part A; and a urea water suction pipeline 35a disposed in the urea water tank 40.

Description

  The present invention relates to a construction machine provided with a urea water tank.

  A large vehicle such as a truck is provided with a tank for storing urea water in order to purify exhaust gas from a mounted diesel engine. A breather pipe for releasing the pressure in the tank is provided on the upper surface of the tank.

  The urea water in the tank may splash up and adhere to the breather pipe due to vibration transmission from the engine or road surface irregularities, etc., but this urea water is smoothly returned to the tank and the urea water is left attached to the breather pipe. In order to avoid the harmful effects caused by this, there is one in which the inner surface of the vent of a breather pipe provided on the upper surface of the tank is formed of a resin (for example, see Patent Document 1).

JP 2007-270744 A

  On the other hand, a construction machine is provided with a tank for storing urea water in order to purify exhaust gas from a mounted diesel engine. When this tank is mounted on a construction machine, in order to prevent damage to the tank due to expansion during freezing of urea water, for example, a space of about 10% in which urea water cannot be injected is formed in the tank. In addition, since the urea water tank mounted on the construction machine is largely moved in conjunction with the turning movement of the construction machine, the urea water in the tank is replaced with the urea water in the tank provided in a large vehicle such as a truck. Compared to large swings.

  In a construction machine that operates under such special conditions, when a breather pipe similar to the conventional technology is installed in the urea water tank, the urea water permeates into the breather pipe from the breather pipe vent due to the shaking of the urea water. This causes a problem of leakage to the outside of the tank.

  The present invention has been made based on the above matters, and an object thereof is to provide a construction machine including a urea water tank capable of suppressing leakage of stored urea water to the outside of the tank through a breather pipe. It is.

  In order to achieve the above object, a first invention is a construction machine including a urea water tank for storing urea water, and a side surface provided between a bottom surface portion, a top surface portion, the bottom surface portion, and the top surface portion. And a water supply port provided on the side surface of the urea water tank so as to form a gas phase portion in the urea water tank that absorbs the expansion due to freezing of the urea water. A breather pipe having a tip portion penetrating the upper surface portion of the urea water tank and extending obliquely downward into the gas phase portion, and a urea water suction pipe disposed in the urea water tank. And

  Moreover, 2nd invention is 1st invention. WHEREIN: The opening part provided in the said upper surface part of the said urea water tank, The cover part attached to the said opening part of the said urea water tank so that attachment or detachment was possible, The said opening part And a heating pipe that is disposed in the urea water tank and through which a fluid for warming the urea water in the urea water tank flows, the breather pipe, the urea water suction pipe, and the A heating pipe is assembled to the lid portion.

  Further, according to a third aspect, in the second aspect, the heating pipe is configured by a vertical pipe portion extending in the vertical direction and a bent pipe portion bent toward the side surface portion with respect to the vertical pipe portion. The breather pipe is arranged such that the tip end side thereof is in the same direction as the bending direction of the bent piping portion of the heating piping with respect to the vertical piping portion.

  According to a fourth aspect of the present invention, in the second or third aspect of the invention, the tip end side of the breather pipe falls within a projected area of the lid portion in plan view.

  Furthermore, a fifth invention is characterized in that, in the first to fourth inventions, a protrusion is provided at the tip of the breather pipe, the lower surface of which protrudes from the upper surface to the tip.

  According to the present invention, the breather pipe is configured such that its tip end extends obliquely downward into the gas phase portion of the urea water tank, so that when the construction machine travels on a rough road, or when the construction machine performs a turning operation, etc. Even if it is broken, the urea water can be prevented from leaking out of the urea water tank through the breather pipe.

1 is a side view of a hydraulic excavator to which a first embodiment of a construction machine including a urea water tank according to the present invention is applied. It is a block diagram which shows the NOx purification apparatus which comprises 1st Embodiment of the construction machine provided with the urea water tank of this invention shown in FIG. It is a front view which shows the urea water tank which comprises 1st Embodiment of the construction machine provided with the urea water tank of this invention shown in FIG. It is the vertical side view which looked at the urea water tank which comprises 1st Embodiment of the construction machine provided with the urea water tank of this invention shown in FIG. 3 from the IV-IV arrow. It is a vertical side view which shows the urea water tank which comprises 2nd Embodiment of the construction machine provided with the urea water tank of this invention. It is a vertical side view which shows the urea water tank which comprises 3rd Embodiment of the construction machine provided with the urea water tank of this invention. It is a vertical side view which shows the urea water tank which comprises 4th Embodiment of the construction machine provided with the urea water tank of this invention. It is the cross-sectional view which looked at the urea water tank which comprises 4th Embodiment of the construction machine provided with the urea water tank of this invention shown in FIG. 7 from the VIII-VIII arrow. It is a perspective view which expands and shows an example of the modification of the lower side pipe part of the breather pipe which comprises the 1st thru | or 4th embodiment of the construction machine provided with the urea water tank of this invention. It is a perspective view which expands and shows the other example of the modification of the lower side pipe part of the breather pipe which comprises the 1st thru | or 4th embodiment of the construction machine provided with the urea water tank of this invention.

Embodiments of a construction machine provided with a urea water tank according to the present invention will be described below with reference to the drawings.
1 to 4 show a first embodiment of a construction machine having a urea water tank according to the present invention. FIG. 1 shows a first embodiment of a construction machine having a urea water tank according to the present invention. 2 is a side view of a hydraulic excavator to which the present invention is applied, FIG. 2 is a configuration diagram showing a NOx purification device constituting the first embodiment of the construction machine having the urea water tank of the present invention shown in FIG. 1, and FIG. FIG. 4 is a front view showing the urea water tank constituting the first embodiment of the construction machine having the urea water tank of the present invention shown in FIG. 4, and FIG. 4 is a diagram of the construction machine having the urea water tank of the present invention shown in FIG. It is the vertical side view which looked at the urea water tank which comprises 1st Embodiment from the IV-IV arrow.

  In FIG. 1, a hydraulic excavator 1 includes a traveling body 2, a revolving body 3 that is turnably mounted on the traveling body 2, and a work front 4 that is installed on the front side of the revolving body 3 so as to be able to be raised and lowered. .

  The traveling body 2 is rotatably supported on the track frame 5, the drive wheel 6 rotatably supported on the rear end (left side in FIG. 1) of the track frame 5, and the front end (right side in FIG. 1) of the track frame 5. And a crawler belt 8 wound around the driving wheel 6 and the idler wheel 7.

  The work front 4 includes a boom 9 attached to the revolving body 3 so as to be able to be lifted and lowered by a boom cylinder 9a, an arm 10 attached to the boom 9 so as to be rotatable by an arm cylinder 10a, and a arm 10 that can be turned by a bucket cylinder 11a. And a bucket 11 provided at the tip.

  The swivel body 3 is mounted on the traveling body 2 so as to be swivelable. The swivel frame 12 is provided on the left front side of the swivel frame 12 (on the right side in the drawing in FIG. 1). 12 is provided with a machine room 16 in which equipment such as a diesel engine 14 and a hydraulic pump 15 is housed, and a counterweight 17 provided at the rear end of the swivel frame 12.

  The exhaust pipe 18 of the diesel engine 14 is provided with a NOx purification device 30 for purifying the exhaust. The NOx purification device 30 purifies nitrogen oxides in the exhaust gas using urea water. A urea water tank 40 that stores urea water, which will be described later, is connected to the NOx purification device 30. In this example, the urea water tank 40 is installed on the right front side of the swivel frame 12 (the right side on the front side in FIG. 1).

  Next, a connection configuration between the NOx purification device and the urea water tank 40 constituting the first embodiment of the construction machine including the urea water tank of the present invention will be described with reference to FIG. In FIG. 2, the same reference numerals as those shown in FIG. 1 denote the same parts, and a detailed description thereof will be omitted.

  In FIG. 2, the NOx purification device 30 includes a cylindrical container 31 provided in the exhaust pipe 18 of the diesel engine 14, a urea selective reduction catalyst 32 disposed on the upstream side of the exhaust in the container 31, and urea selection. And an oxidation catalyst 33 disposed on the downstream side of the reduction catalyst 32.

  A urea water injection valve 34 is provided in the exhaust pipe 18 on the upstream side of the urea selective reduction catalyst 32. The urea water injection valve 34 is connected to a urea water tank 40 via a urea water supply pipe 35. The urea water supply pipe 35 has a urea water suction pipe 35 a disposed in the urea water tank 40. A supply pump 36 is provided in the urea water supply pipe 35.

  The NOx purification device 30 injects urea water pressurized by the supply pump 36 into the exhaust gas by the urea water injection valve 34, and oxidizes nitrogen in the exhaust gas by the urea selective reduction catalyst 32 using ammonia generated from the urea water. The product is reduced and decomposed into water and nitrogen, and the remaining ammonia that cannot be reacted with nitrogen oxides is oxidized and decomposed by the oxidation catalyst 33.

  Next, the urea water tank constituting the first embodiment of the construction machine provided with the urea water tank of the present invention will be described with reference to FIGS. 3 and 4, the same reference numerals as those shown in FIGS. 1 and 2 are the same parts, and detailed description thereof is omitted.

  3 and 4, the urea water tank 40 is formed in a polyhedral box shape by, for example, a resin material, and is provided between the bottom surface portion 41, the top surface portion 42, and the bottom surface portion 41 and the top surface portion 42. Part 43. The side surface portion 43 includes a front side surface portion 44 (right side in FIG. 4), a rear side surface portion 45 (left side in FIG. 4), a left side surface portion 46 (right side in FIG. 3), and a right side surface portion 47 (left side in FIG. 3). Yes.

  A projecting portion 44 a that projects to the front side (the right side in FIG. 4) with respect to the front side surface portion 44 is formed at a substantially central portion in the width direction of the front side surface portion 44. A water supply port 48 for supplying urea water into the urea water tank 40 is provided at the upper part of the overhanging portion 44a. The urea water can be supplied until it overflows from the outer opening end 48 a that opens to the outside of the urea water tank 40 of the water supply port 48. In other words, the maximum liquid level Hmax of the urea water in the urea water tank 40 is limited by the outer opening end 48 a of the water supply port 48, and the gas phase portion A is formed in the upper part of the urea water tank 40. The gas phase portion A has a function of absorbing the expansion due to freezing of urea water generated when the construction machine is used in, for example, a very cold region.

  A cap 49 for closing the water supply port 48 is detachably attached to the water supply port 48.

  An opening 42a through which various pipes and sensors to be described later can be collectively inserted is provided in the front side portion of the upper surface portion 42 of the urea water tank 40 in the substantially central portion in the width direction. A lid 51 is detachably attached to the opening 42a of the upper surface 42. The lid 51 is made of, for example, a rubber material.

  The lid 51 is disposed in the urea water tank 40 via the urea water suction pipe 35a, the temperature sensor 52 for measuring the temperature of the urea water in the urea water tank 40, and the opening 42a. A heating pipe 53 through which a fluid for warming the urea water in 40 flows is assembled.

  For example, as shown in FIG. 4, the urea water suction pipe 35 a passes through the opening 42 a of the upper surface portion 42 of the urea water tank 40 and hangs down to the vicinity of the bottom surface portion 41.

  For example, the temperature sensor 52 passes through the opening 42 a of the upper surface portion 42 and hangs down to the vicinity of the bottom surface portion 41.

  For example, the warming pipe 53 is inserted into the opening 42a of the upper surface part 42 and extends vertically along the urea water suction pipe 35a and the temperature sensor 52, and the vertical pipe part 53a. It is comprised by the bending piping part 53b bent toward the back side part 45 side (left side of FIG. 4).

  In the heating pipe 53, for example, engine cooling water of the diesel engine 14 (see FIG. 2) flows as a fluid for warming urea water. By heating the urea water in the vicinity of the heating pipe 53 with the heat of the engine cooling water flowing in the heating pipe 53, the urea water is prevented from freezing. Further, by disposing the heating pipe 53 in the vicinity of the urea water suction pipe 35a, it is possible to prevent the urea water from being unable to be supplied to the urea water injection valve 34 (see FIG. 2) due to the freezing of the urea water in the urea water suction pipe 35a. Is done.

  The urea water suction pipe 35a, the temperature sensor 52, and the heating pipe 53 described above are assembled in advance to the lid 51 before the lid 51 is attached to the opening 42a of the upper surface 42. As a result, the urea water suction pipe 35a, the heating pipe 53, the temperature sensor 52, and the lid 51 are configured as a pipe unit 50 and attached to the opening 42a.

  A breather pipe 60 for introducing outside air into the urea water tank 40 is provided near the lid portion 51 in the upper surface portion 42 of the urea water tank 40. The breather pipe 60 is integrally formed with the upper pipe portion 61 and the upper pipe portion 61 that extend vertically through the upper surface portion 42 of the urea water tank 40, and the tip portion penetrates the upper surface portion 42 of the urea water tank 40. In the gas phase portion A, the lower pipe portion 62 extends obliquely downward.

  As shown in FIG. 4, the lower pipe portion 62 is bent from the lower end portion of the upper pipe portion 61 toward the rear side surface portion 45 side (left side in FIG. 4) and extends to the vicinity of the maximum liquid level Hmax of urea water. Yes. The lower pipe portion 62 is formed so that its length L is as long as possible within a range that can be assembled to the urea water tank 40 in the gas phase portion A.

  The opening end 62a of the lower pipe portion 62 is formed so as to be orthogonal to the axial direction of the lower pipe portion 62, and is located above the maximum liquid level Hmax of urea water.

  Next, operation | movement of 1st Embodiment of the construction machine provided with the urea water tank of this invention is demonstrated using FIG.1, FIG.2 and FIG.4.

  When the diesel engine 14 shown in FIG. 2 is driven, the NOx purification device 30 operates, and urea water in the urea water tank 40 is injected into the exhaust gas via the urea water injection valve 34. For this reason, although the liquid level of the urea water falls, since the outside air is introduced into the urea water tank 40 through the breather pipe 60, the urea water tank 40 is maintained at atmospheric pressure, and the urea water urea water Supply to the injection valve 34 is maintained.

  By the way, when the excavator 1 shown in FIG. 1 travels on a rough road at the work site or performs a turning operation during the work, the urea water in the urea water tank 40 shown in FIG. And may reach the upper surface portion 42 of the urea water tank 40.

  Even in such a case, the lower pipe portion 62 of the breather pipe 60 is configured to extend obliquely downward from the lower end portion of the upper pipe portion 61 in the gas phase portion A of the urea water tank 40, so that it swings. It is difficult for urea water to enter the opening end 62 a of the lower pipe portion 62. Even if the urea water temporarily enters from the opening end 62a of the lower pipe portion 62, the lower pipe portion 62 extends obliquely downward, so that the urea water is supplied to the urea water tank 40 by the lower pipe portion 62. It is positively returned inside. For this reason, leakage to the exterior of urea water can be suppressed.

  Further, since the lower pipe portion 62 is formed so that its length L is as long as possible within a range that can be assembled to the urea water tank 40, it is assumed that the urea water has entered the lower pipe portion 62. Moreover, it can suppress reaching the upper pipe part 61. For this reason, leakage to the exterior of urea water can be suppressed.

  Furthermore, the urea water that has entered the lower pipe portion 62 quickly flows down into the urea water tank 40 by the lower pipe portion 62 that extends obliquely downward and does not stay in the lower pipe portion 62. Therefore, precipitation of urea water due to drying in the lower pipe portion 62 can be prevented.

  As described above, according to the first embodiment of the construction machine provided with the urea water tank of the present invention, the breather pipe 60 has the tip (of the lower pipe portion 62) at the gas phase of the urea water tank 40. Since it is configured to extend obliquely downward in the part A, the urea water is also added to the breather pipe 60 even when the construction machine (hydraulic excavator 1) travels on a rough road or when a turning operation is performed at the time of work. It is possible to suppress leakage from the urea water tank 40 to the outside.

  Further, according to the present embodiment, since the lower pipe portion 62 is configured to extend obliquely downward into the gas phase portion A, the urea water swung by the turning operation of the construction machine (hydraulic excavator 1) or the like is lowered. Even if it enters the side pipe part 62, it does not stay in the lower pipe part 62, so that precipitation of urea water due to drying in the lower pipe part 62 can be prevented.

  Furthermore, according to the present embodiment, the breather pipe 60 is formed so that its length L is as long as possible within the range in which it can be assembled to the urea water tank 40. Even if it penetrates into 62, it can be prevented from reaching the upper pipe portion 61, and can be further prevented from leaking out of the urea water tank 40.

Next, the urea water tank which comprises 2nd Embodiment of the construction machine provided with the urea water tank of this invention is demonstrated using FIG.
FIG. 5 is a longitudinal side view showing a urea water tank constituting a second embodiment of a construction machine provided with the urea water tank of the present invention. In FIG. 5, the same reference numerals as those shown in FIGS. 1 to 4 are the same parts, and detailed description thereof is omitted.

  In the second embodiment of the construction machine having the urea water tank of the present invention shown in FIG. 5, the breather pipe 60 constituting the first embodiment is provided on the upper surface portion 42 of the urea water tank 40. On the other hand, the breather pipe 70 is provided on the lid 51 attached to the opening 42 a of the upper surface 42.

  In the present embodiment, a breather pipe 70 is provided at the front end portion (right side in FIG. 5) of the lid portion 51 of the urea water tank 40. The lower pipe portion 72 of the breather pipe 70 has its tip end extending obliquely downward into the overhanging portion 44a side (the right side in FIG. 5) in the gas phase portion A of the urea water tank 40.

  The breather pipe 70 is assembled in advance to the lid portion 51 before the lid portion 51 is attached to the opening portion 42a of the upper surface portion 42, like the urea water suction pipe 35a, the temperature sensor 52, and the heating pipe 53 described above. Thus, these are configured as a pipe unit 80 and attached to the opening 42a.

  According to the second embodiment of the construction machine provided with the urea water tank of the present invention described above, the same effects as those of the first embodiment described above can be obtained.

  Further, according to the present embodiment, since the breather pipe 70 is provided in the lid part 51, the breather pipe 70, the urea water suction pipe 35 a, the heating pipe 53, the temperature sensor 52, and the lid part 51 are configured as a pipe unit 80. In addition, it is possible to easily attach the upper surface portion 42 to the opening portion 42a.

Next, the urea water tank which comprises the 3rd Embodiment of the construction machine provided with the urea water tank of this invention is demonstrated using FIG.
FIG. 6 is a longitudinal sectional side view showing a urea water tank constituting a third embodiment of a construction machine provided with the urea water tank of the present invention. In FIG. 6, the same reference numerals as those shown in FIGS. 1 to 5 are the same parts, and detailed description thereof is omitted.

  In the third embodiment of the construction machine having the urea water tank of the present invention shown in FIG. 6, the tip end side of the lower pipe portion 72 of the breather pipe 70 constituting the second embodiment is the heating pipe 53. The bent pipe portion 53b is arranged to be different from the bent direction (left direction in FIG. 5) with respect to the vertical pipe portion 53a, whereas the distal end side of the lower pipe portion 92 of the breather pipe 90 is heated. The bent pipe part 53b is arranged in the same direction as the bent direction (left direction in FIG. 6) with respect to the vertical pipe part 53a.

  In the present embodiment, a breather pipe 90 is provided at the rear end portion (left side in FIG. 6) of the lid portion 51 of the urea water tank 40. The lower pipe portion 92 of the breather pipe 90 extends obliquely downward into the gas phase portion A of the urea water tank 40 toward the rear side surface portion 45 (left side in FIG. 6).

  According to the third embodiment of the construction machine provided with the urea water tank of the present invention described above, the same effects as those of the second embodiment described above can be obtained.

  Further, according to the present embodiment, the distal end side of the lower pipe portion 92 of the breather pipe 90 is the same as the bending direction of the bent piping portion 53b of the warming piping 53 with respect to the vertical piping portion 53a (left direction in FIG. 6). Since the pipe unit 100 having the bent warming pipe 53 and the breather pipe 90 is attached to the opening 42a of the upper surface part 42, the warming pipe 53 and the breather pipe 90 are easily arranged. It can be inserted into the opening 42a. For this reason, the attachment work to the opening part 42a of the pipe unit 100 provided with the heating piping 53, the breather pipe 90, etc. can be performed more easily.

Next, the urea water tank which comprises 4th Embodiment of the construction machine provided with the urea water tank of this invention is demonstrated using FIG.7 and FIG.8.
FIG. 7 is a longitudinal side view showing a urea water tank constituting a fourth embodiment of a construction machine having a urea water tank of the present invention, and FIG. 8 is a construction having the urea water tank of the present invention shown in FIG. It is the cross-sectional view which looked at the urea water tank which comprises 4th Embodiment of a machine from the VIII-VIII arrow. 7 and 8, the same reference numerals as those shown in FIGS. 1 to 6 are the same parts, and detailed description thereof is omitted.

  In the fourth embodiment of the construction machine provided with the urea water tank of the present invention shown in FIGS. 7 and 8, the tip end side of the lower pipe portion 92 of the breather pipe 90 constituting the third embodiment is The tip of the lower pipe portion 112 of the breather pipe 110 is within the projected area of the lid 51 in plan view, whereas the lid 51 protrudes from the projected area of the lid 51 in plan view. is there.

  Specifically, in the present embodiment, the breather pipe 110 is provided at the front end portion (right side in FIG. 7) of the lid portion 51 of the urea water tank 40, and the lower pipe portion 112 of the breather pipe 110 is disposed at the tip portion. It extends obliquely downward toward the rear side surface 45 (the left side in FIG. 7) and has a length L that is shorter than the outer diameter of the lid 51.

  According to the fourth embodiment of the construction machine including the urea water tank of the present invention described above, the tip end side of the lower pipe portion 112 of the breather pipe 110 is within the projected area of the lid portion 51 in plan view. Since the pipe unit 120 having the breather pipe 110 and the like is attached to the opening 42a of the upper surface portion 42, the breather pipe 110 can be inserted into the opening 42a without any trouble. For this reason, the attachment work to the opening part 42a of the pipe unit 120 provided with the breather pipe 110 etc. can be performed still more easily.

  In the above-described embodiment, the open end 62a of the lower pipe portion 62 of the breather pipe 60 is formed so as to be orthogonal to the axial direction of the lower pipe portion 62. In order to suppress the intrusion into the tube, as shown in FIG. 9, a projecting portion 133 whose lower side protrudes from the upper side to the front end side can be integrally provided at the tip of the lower pipe portion 62 of the breather pipe 130. .

  Further, in order to suppress the intrusion into the lower pipe portion 62 of the urea water, as shown in FIG. 10, a semicircular cross section is formed below the outer peripheral surface of the distal end portion of the lower pipe portion 62 of the breather pipe 140. It is also possible to provide the arc-shaped projecting portion 143 so as to project from the opening end 62 a of the lower pipe portion 62.

  FIG. 9 is an enlarged perspective view showing an example of a modification of the lower pipe portion of the breather pipe constituting the first to fourth embodiments of the construction machine including the urea water tank of the present invention, and FIG. It is a perspective view which expands and shows the other example of the modification of the lower side pipe part of the breather pipe which comprises the 1st thru | or 4th embodiment of the construction machine provided with the urea water tank of this invention. In FIG. 9 and FIG. 10, the same reference numerals as those shown in FIG. 1 to FIG.

  In the above-described embodiment, an example in which the construction machine provided with the urea water tank of the present invention is applied to a hydraulic excavator has been shown. However, the construction machine may be applied to various construction machines such as a wheel loader equipped with a diesel engine and a hydraulic crane. Can be widely applied.

  Further, in the above-described embodiment, the water supply port 48 is provided in the overhanging portion 44a formed on the front side surface portion 44. However, the maximum water level Hmax in the urea water tank 40 is limited by the water supply port 48. It is sufficient that the gas phase portion A can be formed, and the water supply port 48 can be provided in any one of the side surface portions 43 of the rear side surface portion 45, the left side surface portion 46, and the right side surface portion 47.

  In the above-described embodiment, the upper pipe portion 61 of the breather pipe 60 is provided on the upper surface 42 of the urea water tank 40 so as to extend in the vertical direction, but the upper pipe portion 61 is connected to the lower pipe portion 62. And bent so as to extend obliquely with respect to the vertical direction.

  In the fourth embodiment described above, the tip of the lower pipe portion 92 of the breather pipe 90 extends obliquely downward toward the rear side surface portion 45 (left side in FIG. 6). As long as the side pipe portion 112 is accommodated within the projected area of the lid portion 51 in plan view, the orientation of the tip portion of the lower pipe portion 112 is arbitrary.

1 Excavator (construction machine)
35a Urea water suction pipe 40 Urea water tank 41 Bottom surface part 42 Upper surface part 42a Opening part 43 Side part 48 Water supply port 51 Lid part 53 Heating pipes 60, 70, 90, 110, 130, 140 Breather pipes 133, 143 Protrusion A Gas phase

Claims (5)

A construction machine having a urea water tank for storing urea water,
The urea water tank comprising a bottom surface portion, a top surface portion, and a side surface portion provided between the bottom surface portion and the top surface portion;
A water supply port provided in the side surface portion of the urea water tank so as to form a gas phase portion in the urea water tank that absorbs expansion due to freezing of the urea water;
A breather pipe having a tip portion penetrating the upper surface portion of the urea water tank and extending obliquely downward into the gas phase portion;
A construction machine provided with a urea water tank, comprising a urea water suction pipe disposed in the urea water tank. In the construction machine provided with the urea water tank according to claim 1,
An opening provided in the upper surface of the urea water tank;
A lid part detachably attached to the opening of the urea water tank;
A heating pipe that is disposed in the urea water tank through the opening and through which a fluid for warming the urea water in the urea water tank flows;
A construction machine comprising a urea water tank, wherein the breather pipe, the urea water suction pipe, and the heating pipe are assembled to the lid. In the construction machine provided with the urea water tank according to claim 2,
The warming pipe is composed of a vertical pipe part extending in the vertical direction and a bent pipe part bent toward the side surface part with respect to the vertical pipe part,
The construction comprising the urea water tank, wherein the breather pipe is arranged so that the tip end side thereof is in the same direction as the bending direction of the bent piping portion of the warming piping with respect to the vertical piping portion. machine. In the construction machine provided with the urea water tank according to claim 2 or 3,
A construction machine including a urea water tank, wherein the tip end side of the breather pipe is within a projected area of the lid portion in plan view. In the construction machine provided with the urea water tank according to any one of claims 1 to 4,
A construction machine comprising a urea water tank, characterized in that a projecting portion whose lower surface projects from the upper surface to the distal end is provided at the distal end of the breather pipe.

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