Work machine

Abstract

To provide a work machine which can suppress the heating of a tank.SOLUTION: A radiator 2 cools a cooling medium of an engine 5. A sealed tank 1 stores the cooling medium to replenish the radiator 2. The sealed tank 1 has a part arranged at a position higher than an upper end 2U of the radiator 2. The sealed tank 1 has a part arranged outside the radiator 2 in a storage space SS in which the engine 5 is stored. The sealed tank 1 is located upwind of the radiator 2 in the blowing direction of a cooling fan 3 upon cooling the radiator 2.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to work machines. [Background technology]

[0002] The engine of a work machine is cooled by a cooling medium such as cooling water. The cooling medium is cooled in a radiator. A reserve tank is connected to the radiator. The reserve tank stores the cooling medium to be used to replenish the radiator.

[0003] A configuration using a sealed tank as a reserve tank is described in International Publication No. 2019 / 187571 (Patent Document 1). The sealed tank in Patent Document 1 is provided above the shroud and is disposed between the radiator and the engine when viewed from above. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2019 / 187571 Summary of the Invention [Problem to be solved by the invention]

[0005] In the configuration described in Patent Document 1, the cooling capacity may be reduced due to the sealed tank coming into contact with the hot atmosphere in the engine room.

[0006] An object of the present disclosure is to provide a work machine that can suppress heating of the tank. [Means for solving the problem]

[0007] The work machine of the present disclosure includes an engine, a radiator, a tank, and a cooling fan. The radiator cools the cooling medium of the engine. The tank stores the cooling medium to be replenished to the radiator. The tank has a portion that is positioned higher than the top end of the radiator. The tank has a portion that is positioned outside the radiator in a storage space that stores the engine. The tank is located upwind of the radiator in the direction of airflow from the cooling fan when cooling the radiator. [Effects of the Invention]

[0008] According to the present disclosure, a work machine capable of suppressing heating of the tank can be realized. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a side view showing a configuration of a work machine according to an embodiment of the present disclosure. [Figure 2] 1 is a circuit diagram showing a circulation circuit of an engine cooling medium as an engine cooling system. [Figure 3] FIG. 4 is a diagram showing the positional relationship between the sealed tank and the radiator as viewed from the rear. [Figure 4] 10 is a view of the storage space seen from the opening of the exterior panel with the door panel of the exterior panel open. FIG. [Figure 5] FIG. 2 is a top view of the work machine showing the arrangement of the sealed tank. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0011] In the specification and drawings, the same or corresponding components are denoted by the same reference numerals, and redundant explanations will not be repeated. In addition, in the drawings, configurations may be omitted or simplified for the sake of convenience.

[0012] In the following description, the terms "up," "down," "front," "rear," "left," and "right" refer to directions relative to an operator seated in the driver's seat 14S in the driver's cab 14 shown in Figure 1.

[0013] Therefore, in the following description, the fore-aft direction X is the direction in which the boom 16 extends between the base end and the tip end in a top view. The left-right direction Y (FIG. 3) is the direction perpendicular to the fore-aft direction X in a top view. The up-down direction Z is the direction perpendicular to a plane including the fore-aft direction X and the left-right direction Y, which are perpendicular to each other.

[0014] The direction from the base end of the boom 16 to the tip end is the front, and the direction from the tip end of the boom 16 to the base end is the rear. When looking forward from the rear, the right and left sides are the right and left, respectively. In the up-down direction, the side with the ground is the bottom, and the side with the sky is the top. A top view means a view from which the work machine 10 is viewed from above downwards. A rear view means a view from which the rotating bed 13 is viewed from the rear to the front.

[0015] <Configuration of work machine 10>

[0016] Fig. 1 is a side view showing a schematic configuration of a work machine according to one embodiment of the present disclosure. As shown in Fig. 1, the work machine 10 according to this embodiment is, for example, a hydraulic excavator, such as a small hydraulic excavator. The work machine 10 according to this embodiment may also be, for example, a short swing type or ultra-short swing type hydraulic excavator. However, the work machine 10 is not limited to a hydraulic excavator, and may be any work machine 10 having an engine and a cooling system for cooling the engine.

[0017] A hydraulic excavator 10 as an example of a work machine 10 has a main body 11 and a hydraulically operated work implement 12. The main body 11 has a revolving body 13 and a traveling body 15.

[0018] The running body 15 has a pair of left and right crawler tracks 15Cr and a traveling motor 15M. The hydraulic excavator 10 can travel by rotation of the crawler tracks 15Cr. The traveling motor 15M is provided as a drive source for the running body 15.

[0019] The rotating body 13 is disposed on the running body 15 and is supported by the running body 15. The rotating body 13 can be rotated relative to the running body 15 about a rotation axis RX by a rotation motor (not shown). The rotation axis RX is an imaginary straight line that serves as the rotation center of the rotating body 13.

[0020] The rotating body 13 has a driver's cab 14. A driver's seat 14S where an operator sits is provided inside the driver's cab 14. The operator sits in the driver's seat 14S and can operate the work equipment 12, rotate the rotating body 13 relative to the traveling body 15, and travel the hydraulic excavator 10 using the traveling body 15.

[0021] The work implement 12 is supported by a revolving unit 13. The work implement 12 has a boom 16, an arm 17, and a bucket 18. The work implement 12 further has a boom cylinder 19a, an arm cylinder 19b, and a bucket cylinder 19c.

[0022] The boom 16 is rotatably connected to the main body 11. Specifically, the base end of the boom 16 is rotatably connected to the revolving unit 13 with a boom foot pin BF as a fulcrum. The base end of the boom 16 is disposed to the left and right of the operator's cab 14. The arm 17 is rotatably connected to the boom 16. Specifically, the base end of the arm 17 is rotatably connected to the tip of the boom 16 with a boom top pin BT as a fulcrum. The bucket 18 is rotatably connected to the arm 17. Specifically, the base end of the bucket 18 is rotatably connected to the tip of the arm 17 with an arm top pin AT as a fulcrum.

[0023] Although the above describes a configuration in which the driver's seat 14S is located inside the driver's cab 14, the driver's seat 14S may be exposed to the outside without the driver's cab 14. The work machine 10 may also not have a driver's cab 14 and operate automatically without a human. The work machine 10 may also not have a driver's cab 14 and be remotely operated by a remote controller.

[0024] The rotating body 13 has a counterweight CW and an exterior panel 13P. The counterweight CW is located at the rear end of the rotating body 13. The counterweight CW is provided to improve the stability of the main body 11 when the work machine 10 is working by balancing the unbalanced weight caused by the work implement 12. The exterior panel 13P, together with the counterweight CW, surrounds the internal space (storage space SS) of the rotating body 13.

[0025] The rotating body 13 further has an engine 5 as a drive source and a cooling system for the engine 5. The cooling system for the engine 5 has a sealed tank 1 and a radiator 2. The engine 5 and the radiator 2 are arranged in a storage space SS of the rotating body 13. The engine 5 and the radiator 2 are surrounded by a counterweight CW and an exterior panel 13P.

[0026] <Engine cooling system>

[0027] Next, the engine cooling system used in the work machine of this embodiment will be described with reference to FIG.

[0028] 2 is a circuit diagram showing a circulation circuit of an engine cooling medium as an engine cooling system. As shown in FIG. 2, the engine cooling system has a sealed tank 1 and a radiator 2.

[0029] Inside the engine 5, there is provided a flow path (for example, a water jacket) through which a cooling medium flows to cool the engine 5. The radiator 2 is connected to the water jacket of the engine 5 via flow paths 8b and 8c. One end of each of the flow paths 8b and 8c is connected to the radiator 2, and the other end of each of the flow paths 8a and 8b is connected to the water jacket of the engine 5. This allows the cooling medium to circulate between the engine 5 and the radiator 2.

[0030] The engine 5 is provided with a pump 6. The pump 6 is disposed on the inlet side of the water jacket. When the pump 6 is driven, the cooling medium circulates between the engine 5 and the radiator 2. As a result, the cooling medium cooled by the radiator 2 is supplied to the engine 5, and the engine 5 can be cooled by the cooled cooling medium.

[0031] The sealed tank 1 is connected to the radiator 2 and the engine 5 through flow paths 8a and 8b. The flow path 8a is a make-up line. One end of the flow path 8a is connected to the sealed tank 1, and the other end of the flow path 8a is connected to the flow path 8b. This allows the cooling medium supplied to the sealed tank 1 to be supplied to the radiator 2 and the engine 5 through the flow paths 8a and 8b.

[0032] The radiator 2 and the sealed tank 1 are connected by an air vent hose 8d. The engine 5 and the sealed tank 1 are connected by an air vent hose 8e. This makes it possible to vent the air inside the radiator 2 and the engine 5 to the sealed tank 1 through the air vent hoses 8d and 8e when supplying a cooling medium to the radiator 2 and the engine 5, respectively.

[0033] An overflow hose 8f is connected to the sealed tank 1. This makes it possible to discharge the cooling medium that is excessively supplied into the sealed tank 1 to the outside of the sealed tank 1 through the overflow hose 8f.

[0034] The sealed tank 1 has a supply port (opening) 1b. The supply port 1b connects the internal space of the sealed tank 1 with the outside. The supply port 1b is used to supply a cooling medium to the internal space of the sealed tank 1. The supply port 1b is provided in a mouth portion 1c provided on the top surface 1U of the main body of the sealed tank 1. The supply port 1b can be opened and closed by a pressure cap 1a. By closing the supply port 1b with the pressure cap 1a, the internal space of the sealed tank 1 can be sealed.

[0035] The sealed tank 1 has a portion that is located higher than both the upper end 2U of the radiator 2 and the upper end 5U of the engine 5. For example, the entire sealed tank 1 may be located higher than both the upper end 2U of the radiator 2 and the upper end 5U of the engine 5.

[0036] When supplying the cooling medium to each of the engine 5 and the radiator 2, first, the pressure cap 1a of the sealed tank 1 is removed from the body of the sealed tank 1. This opens the supply port 1b of the sealed tank 1. The cooling medium is supplied to the internal space of the sealed tank 1 from the open supply port 1b.

[0037] The cooling medium supplied to the sealed tank 1 is supplied from the bottom of the radiator 2 and the engine 5 through flow paths 8a and 8b, which form makeup lines. As the cooling medium continues to be supplied, the insides of the radiator 2 and the engine 5 are filled with the cooling medium.

[0038] As a result, the air inside the radiator 2 and the engine 5 is released through the air vent hoses 8d and 8e into the sealed tank 1. The air released into the sealed tank 1 is discharged to the outside of the sealed tank 1 through the supply port 1b.

[0039] The sealed tank 1 is positioned higher than the upper ends 2U and 5U of the radiator 2 and the engine 5. Therefore, when the water level of the coolant in the sealed tank 1 stabilizes, it can be determined that the insides of the radiator 2 and the engine 5 are filled with coolant. After the insides of the radiator 2 and the engine 5 are filled with coolant, the supply of coolant is stopped. Thereafter, the supply port 1b of the sealed tank 1 is closed by the pressure cap 1a, and the internal space of the sealed tank 1 is sealed.

[0040] By positioning the sealed tank 1 higher than the upper ends 2U and 5U of the radiator 2 and the engine 5, the water level of the coolant can be maintained within the sealed tank 1, thereby filling the interiors of the radiator 2 and the engine 5 with the coolant. Furthermore, by positioning the sealed tank 1 higher than the upper ends 2U and 5U of the radiator 2 and the engine 5, an air space can be created within the sealed tank 1 even when the interiors of the radiator 2 and the engine 5 are filled with the coolant. Therefore, even if the volume of the coolant changes due to heat while the interior of the sealed tank 1 is sealed, the air space within the sealed tank 1 can accommodate the change in volume of the coolant. Furthermore, by closing the supply port 1b of the sealed tank 1 with the pressure cap 1a, the interior space of the sealed tank 1 can be sealed. Therefore, evaporation of the heated coolant and leakage from the sealed tank 1 to the outside can be prevented.

[0041] In the above, the cooling medium is, for example, water, but it is not limited to water and may be a fluid other than water. Also, in the above, the sealed tank 1 in which the internal space is sealed is described as the tank, but the tank is not limited to a sealed tank and may be an open tank in which the internal space is open to the outside.

[0042] The radiator 2 is configured by, for example, a heat exchanger, but may be anything that can cool the cooling medium by releasing the heat of the cooling medium.

[0043] <Layout of engine cooling system>

[0044] Next, the layout of the engine cooling system shown in FIG. 2, particularly the layout of the sealed tank 1, will be described with reference to FIGS.

[0045] Fig. 3 is a diagram showing the positional relationship between the sealed tank and the radiator as viewed from the rear. Fig. 4 is a diagram showing the inside of the storage space from the opening in the exterior panel with the door panel of the exterior panel open. Fig. 5 is a top view of the work machine showing the arrangement of the sealed tank.

[0046] As shown in Fig. 3, the radiator 2 is arranged in the storage space SS of the rotating body 13 together with the cooling fan 3 and the engine 5. The radiator 2, the cooling fan 3, and the engine 5 are surrounded by an exterior panel 13P and a counterweight CW (Fig. 1). The exterior panel 13P includes, for example, an engine hood 13a, side panels 13b, and door panels 13d.

[0047] The engine hood 13a covers the radiator 2, the cooling fan 3, and the engine 5 from above. The side panels 13b are located on the left-right direction Y of the sealed tank 1, the radiator 2, the cooling fan 3, and the engine 5, respectively.

[0048] The exterior panel 13P has an opening OP. The opening OP connects the outside of the exterior panel 13P to the storage space SS. The opening OP is located in the left-right direction Y of each of the sealed tank 1, the radiator 2, the cooling fan 3, and the engine 5.

[0049] The door panel 13d is supported so as to be able to open and close the opening OP. The door panel 13d is attached via a hinge HP to a support member SM fixed to a revolving frame (not shown), for example.

[0050] The door panel 13d is located on the left-right direction Y of the sealed tank 1, the radiator 2, the cooling fan 3, and the engine 5. The side panel 13b and the door panel 13d sandwich the sealed tank 1, the radiator 2, the cooling fan 3, and the engine 5 in the left-right direction Y. The side panel 13b may be the door panel 13d. In this case, the pair of left and right door panels 13d sandwich the sealed tank 1, the radiator 2, the cooling fan 3, and the engine 5 in the left-right direction Y. The rear of each of the radiator 2, the cooling fan 3, and the engine 5 is covered by a counterweight CW.

[0051] The engine 5 is disposed in the left-right direction Y of the radiator 2. The cooling fan 3 is disposed between the radiator 2 and the engine 5. The radiator 2, the cooling fan 3, and the engine 5 are arranged in this order in the left-right direction Y.

[0052] The cooling fan 3 may be disposed on the opposite side of the radiator 2 from the engine 5. In this case, the cooling fan 3, the radiator 2, and the engine 5 are arranged in this order in the left-right direction Y.

[0053] A through hole TH is provided in the engine hood 13a. The through hole TH connects the storage space SS of the rotating body 13 to the outside. The sealed tank 1 is arranged so as to pass through the through hole TH. The lower part of the sealed tank 1 is arranged in the storage space SS of the rotating body 13. The upper part of the sealed tank 1 protrudes to the outside of the rotating body 13 through the through hole TH. As a result, the sealed tank 1 is arranged so as to protrude upward in the vertical direction Z from the upper surface 13U of the engine hood 13a. The part of the sealed tank 1 protruding upward from the upper surface 13U of the engine hood 13a may be covered by a cover, panel, etc.

[0054] The sealed tank 1 has a portion that is positioned higher in the vertical direction Z than the upper end 2U of the radiator 2 and the upper end 5U of the engine 5. The entire sealed tank 1 may be positioned higher than the upper end 2U of the radiator 2 and the upper end 5U of the engine 5. The lower end 1L of the sealed tank 1 is positioned higher than both the upper end 2U of the radiator 2 and the upper end 5U of the engine 5.

[0055] The sealed tank 1 is disposed outside the radiator 2 in the storage space SS that houses the engine 5. The outside of the radiator 2 in the storage space SS means the opposite side of the center line CL of the rotating unit 13 with respect to the radiator 2 in a rear view. Here, the center line CL of the rotating unit 13 means a line that bisects the vehicle width W of the rotating unit 13 in a rear view so as to be W / 2, and extends in the vertical direction Z.

[0056] The sealed tank 1 is located on the opposite side of the radiator 2 from the engine 5 in the left-right direction Y. The cooling fan 3 blows air in a direction from the radiator 2 toward the engine 5 when cooling the radiator 2. On the other hand, the cooling fan 3 blows air in a direction from the engine 5 toward the radiator 2 when cleaning the radiator 2. The sealed tank 1 is located upwind of the radiator 2 in the air blowing direction of the cooling fan 3 when cooling the radiator 2. Specifically, the sealed tank 1 is located upwind of the radiator 2 in the air blowing direction of the cooling fan 3 that blows air from the radiator 2 to the engine 5.

[0057] The sealed tank 1 is disposed on the opposite side of the engine 5 in the left-right direction Y with respect to the radiator 2. For example, the sealed tank 1 is disposed offset in the left-right direction Y with respect to a region UR directly above the radiator 2. The region UR directly above the radiator 2 is a region obtained by extending the maximum width of the radiator 2 in the left-right direction Y upward in the up-down direction Z.

[0058] The radiator 2 has a core portion, an upper tank connected to the upper end of the core portion, and a lower tank connected to the lower end of the core portion. The upper end 2U of the radiator 2 means the upper end of the core portion of the radiator 2, but may also be the upper end of the upper tank of the radiator 2.

[0059] As indicated by the arrow AR, there is a space between the door panel 13d that closes the opening OP and the sealed tank 1 that leads in a straight line from the opening OP to the sealed tank 1. Therefore, as shown in Fig. 4, when the door panel 13d is in a state where the opening OP is open, and the user looks at the storage space SS from outside the exterior panel 13P, the sealed tank 1 can be seen.

[0060] The sealed tank 1 is configured so that the amount of cooling medium filled or the liquid level inside the sealed tank 1 can be confirmed from the outside of the sealed tank 1. The sealed tank 1 is made of, for example, a transparent, semi-transparent, or translucent material.

[0061] This allows the user to check the liquid level of the cooling medium in the sealed tank 1 from outside the exterior panel 13P through the opening OP by opening the door panel 13d, which makes it easy to perform maintenance such as refilling the cooling medium.

[0062] As shown in FIG. 3, a shielding plate 4 is provided on the radiator 2. The shielding plate 4 extends from the radiator 2 to the engine hood 13a. A cushioning member is disposed in at least one of the gaps between the shielding plate 4 and the radiator 2 and the gap between the shielding plate 4 and the exterior panel 13P. This cushioning member can fill the gap without damaging cables, piping, etc. The shielding plate 4 separates an area R1 of the storage space SS on the side of the shielding plate 4 where the sealed tank 1 is disposed from an area R2 of the storage space SS on the side where the engine 5 is disposed.

[0063] The sealed tank 1 is disposed on the opposite side of the shielding plate 4 from the engine 5 in the storage space SS. The sealed tank 1 is disposed in an area R1 partitioned by the shielding plate 4. The engine 5 and the cooling fan 3 are each disposed in an area R2 partitioned from the area R1 by the shielding plate 4. The cooling fan 3 may also be disposed in the area R1.

[0064] 5, the shielding plate 4 extends, for example, in the front-to-rear direction X in top view. The shielding plate 4 may extend over the entire storage space SS from its front end (the front end of the exterior panel 13P) to its rear end (the front end of the counterweight CW). The shielding plate 4 blocks heat sent to region R2 by the cooling fan 3 from entering region R1.

[0065] The sealed tank 1 may be located anywhere in the region R1 as viewed from above, as long as it has a portion located in a position higher than the upper end 2U of the radiator 2. The sealed tank 1 is located so as to avoid the region UR (FIG. 3) directly above the radiator 2, as shown by the solid line in FIG. 5. However, as long as the sealed tank 1 has a portion located outside the radiator 2, it may be located so as to overlap with the region UR directly above the radiator 2 as viewed from above, as shown by the dashed line in FIG. 5.

[0066] However, by positioning the sealed tank 1 so as to avoid the region UR directly above the radiator 2, a greater distance can be ensured between the sealed tank 1 and region R2 than when the sealed tank 1 is positioned so as to overlap with the region UR directly above. This makes the sealed tank 1 less susceptible to the heat sent to region R2 by the cooling fan 3, making it possible to further suppress heating of the sealed tank 1. On the other hand, by positioning the sealed tank 1 so as to overlap with the region UR directly above the radiator 2, the length of the piping connecting the sealed tank 1 and the radiator can be shorter than when the sealed tank 1 is positioned so as to avoid the region UR directly above, and this makes it easier to reduce the size of the work machine 10.

[0067] <Effects>

[0068] Next, the effects of this embodiment will be described.

[0069] 3 and 5, in this embodiment, the sealed tank 1 has a portion located outside the radiator 2 in the storage space SS in which the engine 5 is stored. The sealed tank 1 is also located upwind of the radiator 2 in the direction of airflow from the cooling fan 3 when the radiator 2 is being cooled. This prevents the sealed tank 1 from being heated by heat sent downstream of the radiator 2 when the radiator 2 is being cooled.

[0070] 3 and 5, according to this embodiment, the sealed tank 1 is located on the opposite side of the radiator 2 from the engine 5 in the left-right direction Y of the work machine 10. Therefore, when heat from the radiator 2 is transferred from the radiator 2 to the engine 5 during cooling, the sealed tank 1 is prevented from being heated by that heat.

[0071] 3 and 4, there is a space between the door panel 13d and the sealed tank 1 that leads directly from the opening OP to the sealed tank 1. This allows the user to open the door panel 13d to open the opening OP, thereby allowing the user to view the sealed tank 1 through the opening OP. This makes it possible to check the liquid level of the coolant in the sealed tank 1 through the opening OP from outside the exterior panel 13P.

[0072] 3 and 5, the sealed tank 1 is disposed on the opposite side of the shielding plate 4 from the engine 5 in the storage space SS. The shielding plate 4 prevents the heat of the radiator 2 sent to the engine 5 side from being sent to the sealed tank 1 side. Therefore, the shielding plate 4 further prevents the sealed tank 1 from being heated.

[0073] <Additional Notes>

[0074] The above-described embodiment includes the following technical idea.

[0075] (Appendix 1) The engine and a radiator that cools a cooling medium for the engine; a tank for storing the cooling medium to be replenished to the radiator; a cooling fan; the tank has a portion positioned higher than an upper end of the radiator; the tank has a portion disposed outside the radiator in a storage space in which the engine is stored, The tank is located upwind of the radiator in the direction of air blown by the cooling fan when the radiator is being cooled.

[0076] (Appendix 2) 2. The work machine according to claim 1, wherein the tank is located on the opposite side of the radiator from the engine in the left-right direction of the work machine.

[0077] (Appendix 3) The work machine according to claim 1 or 2, wherein the cooling fan is disposed between the radiator and the engine.

[0078] (Appendix 4) an exterior cover that covers the storage space that stores the engine, the radiator, and the tank; the exterior cover has an opening located in the left-right direction of the tank and a door panel that can open and close the opening, The work machine according to any one of Supplementary Note 1 to Supplementary Note 3, wherein a space is present between the door panel and the tank, the space leading linearly from the opening to the tank.

[0079] (Appendix 5) an exterior cover that covers the storage space that stores the engine, the radiator, and the tank; the exterior cover has an engine hood located above the radiator, a shielding plate extending from the radiator to the engine hood; The work machine according to any one of Supplementary Note 1 to Supplementary Note 3, wherein the tank is disposed on an opposite side of the shielding plate from the engine in the storage space.

[0080] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0081] 1 sealed tank, 1L lower end, 1U, 13U upper surface, 1a pressure cap, 1b supply port, 1c port portion, 2 radiator, 2U, 5U upper end, 3 cooling fan, 4 shielding plate, 5 engine, 6 pump, 8a, 8b, 8c flow path, 8d, 8e air bleed hose, 8f overflow hose, 10 work machine, 11 main body, 12 work equipment, 13 rotating body, 13P exterior panel, 13a engine hood, 13b side panel, 13d door panel, 14 operator's cab, 14S operator's seat, 15 running body, 15Cr track, 15M running motor, 16 boom, 17 arm, 18 bucket, 19a boom cylinder, 19b arm cylinder, 19c bucket cylinder, AT arm top pin, BF boom foot pin, BT boom top pin, CL Center line, CW counterweight, HP hinge part, OP opening, R1, R2 area, RX rotation axis, SM support member, SS storage space, TH through hole, UR area directly above.

Claims

1. The engine, a radiator for cooling a cooling medium for the engine; a tank for storing the cooling medium to be replenished to the radiator; A cooling fan, the tank has a portion located higher than an upper end of the radiator; the tank has a portion that is disposed outside the radiator in a storage space in which the engine is stored, A work machine, wherein the tank is located upwind of the radiator in a blowing direction of the cooling fan when the radiator is being cooled.

2. 2. The work machine according to claim 1, wherein the tank is located on an opposite side of the radiator from the engine in the left-right direction of the work machine.

3. The work machine of claim 1 , wherein the cooling fan is disposed between the radiator and the engine.

4. an exterior cover that covers the storage space that houses the engine, the radiator, and the tank; the exterior cover has an opening located in the left-right direction of the tank, and a door panel capable of opening and closing the opening, 2. The work machine according to claim 1, wherein a space is provided between the door panel and the tank, the space leading directly from the opening to the tank.

5. an exterior cover that covers the storage space that houses the engine, the radiator, and the tank; the exterior cover has an engine hood located above the radiator, A shield plate extending from the radiator to the engine hood is further provided. The work machine according to claim 1 , wherein the tank is disposed on an opposite side of the shielding plate from the engine in the storage space.

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