Work machine

Abstract

To provide a work machine that can suppress foreign objects from entering an intake chamber while reducing noise caused by engine sound that passes through a heat exchanger and leaks to the outside from an intake port.SOLUTION: A work machine 1 is provided with a cooling fan 20, an engine 30, a heat exchanger 40 interposed between an intake chamber 81 and an engine chamber 82, and an intake guide 50 guiding air flowing from an intake port 71 into the intake chamber 81 to the heat exchanger 40. The intake guide 50 includes a heat exchanger-side upper wall 52 and an intake port-side upper wall 51. The heat exchanger-side upper wall 52 is positioned upstream in an air flow AF direction, of the heat exchanger 40, and is disposed so as to extend obliquely downward from an upper end part 41 of the heat exchanger 40 or a member 90 connected to the upper end part 41 to a position lower than the upper end part 41. The intake port-side upper wall 51 is disposed so as to extend obliquely upward from a lower end part 52A of the heat exchanger-side upper wall 52 toward the intake port 71.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to work machines such as hydraulic excavators. [Background technology]

[0002] Patent Document 1 discloses a work machine including an engine disposed in an engine compartment, a heat exchanger such as a radiator for cooling the engine, and a cooling fan for generating an airflow from an intake port to the heat exchanger. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4506665 Summary of the Invention [Problem to be solved by the invention]

[0004] Engine noise generated by an engine arranged in an engine room passes through a heat exchanger and leaks from an intake port to the outside of the upper rotating body. Therefore, it is desirable to reduce engine noise leaking to the outside from the intake port. In the invention described in Patent Document 1, the intake port is formed on the upper surface of the outer wall, so that noise such as engine noise can escape upward, thereby suppressing the noise felt by people near the work machine. However, foreign matter such as rainwater and dust may enter the machine room through the intake port formed on the upper surface of the outer wall. In this case, cleaning of the machine room is troublesome, so there is room for improvement in the invention described in Patent Document 1.

[0005] The present disclosure aims to provide a work machine that can reduce noise caused by engine sound that passes through a heat exchanger and leaks to the outside from an intake port, while suppressing foreign objects from entering the intake chamber. [Means for solving the problem]

[0006] A working machine according to a first aspect includes a cooling fan that generates an air flow that flows through an intake port, an intake chamber, and an engine chamber in that order; an engine disposed in the engine chamber; a heat exchanger interposed between the intake chamber and the engine chamber; and an intake guide that guides air flowing into the intake chamber from the intake port to the heat exchanger, the intake guide including a heat exchanger side upper wall and an intake port side upper wall, the heat exchanger side upper wall being located upstream of the air flow more than the heat exchanger and arranged to extend diagonally downward from an upper end of the heat exchanger or a member connected to the upper end to a position lower than the upper end, and the intake port side upper wall being arranged to extend diagonally upward from a lower end of the heat exchanger side upper wall toward the intake port.

[0007] In the work machine according to the first aspect, the heat exchanger-side upper wall and the intake-side upper wall are interposed between the upper part of the heat exchanger and at least a part of the intake port, so that the engine sound passing through the upper part of the heat exchanger is attenuated by the heat exchanger-side upper wall and the intake-side upper wall. In addition, since the intake guide includes not only the heat exchanger-side upper wall but also the intake-side upper wall, it is possible to suppress the intrusion of foreign matter such as rainwater and dust into the intake chamber, compared to a case in which the area corresponding to the intake-side upper wall is open upward. Therefore, in this work machine, it is possible to suppress the intrusion of foreign matter into the intake chamber while reducing the noise caused by the engine sound that passes through the heat exchanger and leaks to the outside from the intake port. Moreover, in this work machine, the air flowing into the intake chamber from the intake port is smoothly guided to the heat exchanger by the intake-side upper wall and the heat exchanger-side upper wall.

[0008] In a second aspect, it is preferable that the work machine according to the first aspect further includes the following configuration. That is, in the work machine according to the second aspect, it is preferable that the intake port side upper wall is continuous from the lower end of the heat exchanger side upper wall to the upper end of the intake port. In this second aspect, the intake port side upper wall and the heat exchanger side upper wall can cover the intake chamber from above in the range from the heat exchanger to the intake port, so that it is possible to more effectively prevent foreign matter such as rainwater and dust from entering the intake chamber.

[0009] A third aspect is preferably the work machine according to the first or second aspect further comprising the following configuration. That is, in the work machine according to the third aspect, it is preferable that the air intake is formed only on the side of the air intake chamber. In this third aspect, it is possible to more effectively prevent foreign matter such as rainwater and dust from entering the air intake chamber.

[0010] A fourth aspect is preferably the work machine according to any one of the first to third aspects, further comprising the following configuration. That is, in the work machine according to the fourth aspect, it is preferable that the lower end of the heat exchanger side upper wall is located lower than the lower end of the intake port. In this fifth aspect, the direction in which engine sound leaks out of the intake port to the outside can be directed obliquely upward.

[0011] A fifth aspect is preferably the work machine according to any one of the first to fourth aspects further comprising the following configuration. That is, in the work machine according to the fifth aspect, it is preferable that the cooling fan is arranged in the engine compartment. In this fifth aspect, since not only the engine but also the cooling fan are arranged in the engine compartment, it is possible to reduce noise caused by engine sound passing through the heat exchanger and leaking to the outside from the intake port, as well as reducing noise caused by cooling fan sound passing through the heat exchanger and leaking to the outside from the intake port.

[0012] A sixth aspect is preferably the work machine according to any one of the first to fifth aspects, further comprising the following configuration. That is, in the work machine according to the sixth aspect, it is preferable that the air intake is formed above the rotation axis of the cooling fan. In this sixth aspect, since the air intake is formed above the rotation axis of the cooling fan, the direction in which sound from the cooling fan leaks out from the air intake to the outside can be directed obliquely upward.

[0013] A seventh aspect is preferably the work machine according to any one of the first to sixth aspects, further comprising the following configuration. That is, the work machine according to the seventh aspect is preferably further provided with a partition separating the intake chamber and the engine compartment. In this seventh aspect, since the intake chamber and the engine compartment are separated by the partition, it is possible to reduce engine noise passing through areas other than the heat exchanger and heading toward the intake port.

[0014] An eighth aspect is preferably the work machine according to any one of the first to seventh aspects further comprising the following configuration. That is, in the work machine according to the eighth aspect, the intake guide may include a duct located upstream of the heat exchanger in the air flow, and the duct may include the heat exchanger-side upper wall. In this eighth aspect, the air guided to the duct along the intake port-side upper wall is further guided by the duct and efficiently flows into the heat exchanger. In this eighth aspect, the intake port-side upper wall and the duct may be formed from separate members, in which case there is an advantage in that these two members are easily molded.

[0015] A ninth aspect is preferably the work machine according to the eighth aspect further comprising the following configuration. That is, the work machine according to the ninth aspect preferably further comprises a filter arranged in the duct, and the filter divides the air intake chamber into a first air intake chamber from the air intake port to the filter, and a second air intake chamber from the filter to the heat exchanger. In this ninth aspect, since a filter is arranged in the duct, air purified by the filter can be made to flow into the engine compartment.

[0016] A tenth aspect is preferably the work machine according to the ninth aspect further comprising the following configuration. That is, in the work machine according to the tenth aspect, it is preferable that the intake guide includes a lower wall that guides air to the second intake chamber at a lower part of the first intake chamber. In this tenth aspect, air that flows into the intake chamber from the intake port and flows through the lower part of the intake chamber is smoothly guided along the lower wall to the duct.

[0017] An eleventh aspect is preferably the work machine according to any one of the first to tenth aspects further comprising the following configuration. That is, in the work machine according to the eleventh aspect, it is preferable that the right rear part and the left rear part of the upper rotating body of the work machine have a curved shape when viewed from above, and at least a part of the intake port is formed in the right rear part or the left rear part. In this eleventh aspect, since at least a part of the intake port is formed in the curved right rear part or the left rear part, it is easier to ensure the opening area of ​​the intake port.

[0018] A twelfth aspect is preferably the work machine according to any one of the first to eleventh aspects, further comprising the following configuration. That is, the work machine according to the twelfth aspect further comprises a mesh member arranged at the air intake, and the mesh member is preferably arranged in an inclined position with respect to the vertical direction so that a lower end of the mesh member is located downstream of the air flow from an upper end of the mesh member. In this twelfth aspect, the mesh member can capture a large amount of dust when air flows from the air intake into the air intake chamber. In addition, because the mesh member is arranged in an inclined position as described above, dust is more likely to fall from the mesh member by its own weight when the engine is stopped. Effect of the Invention

[0019] According to the present disclosure, a work machine is provided that can reduce noise caused by engine sound that passes through a heat exchanger and leaks to the outside from an intake port, while suppressing foreign matter from entering the intake chamber. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a side view illustrating an example of a work machine according to an embodiment. [Diagram 2] FIG. 2 is a perspective view of an upper rotating body of the work machine as viewed diagonally from the rear left. [Diagram 3] FIG. 2 is a plan view showing the inside of a machine room of the upper rotating body. [Figure 4] FIG. 2 is a perspective view showing the inside of the machine room. [Diagram 5]FIG. 2 is a cross-sectional view taken along line AA in FIG. [Figure 6] FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, showing a working machine according to a modified example of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] An embodiment of the present disclosure will be described with reference to the drawings.

[0022] As shown in Fig. 1, the work machine 1 includes a lower travelling body 2 including a travelling device, an upper rotating body 3 supported on the lower travelling body 2 so as to be rotatable relative to the lower travelling body 2 about a vertically extending rotating shaft, and a working device 4 supported on the upper rotating body 3. The work machine 1 according to this embodiment is a hydraulic excavator, but the work machine in this disclosure is not limited to hydraulic excavators and may be other work machines such as a crane or a bulldozer. The travelling device may be a crawler travelling device 2a shown in Fig. 1, or a travelling device having tires (not shown).

[0023] The working device 4 includes a boom 6 that is attached to the upper rotating body 3 so as to be able to rise and fall, an arm 7 that is attached to the boom 6 so as to be able to rotate, and a tip attachment 8 that is attached to the arm 7 so as to be able to rotate. In this embodiment, the tip attachment 8 is a bucket, but the tip attachment may be another tip attachment such as a grapple, a fork, a crusher, or the like.

[0024] The upper rotating body 3 includes a rotating frame 3a, a cab 12 supported by the rotating frame 3a, and an outer wall 13 disposed behind the cab 12. The outer wall 13 has, for example, a box shape and defines a machine room 80. The machine room 80 will be described later. As shown in Figs. 2 and 3, the cab 12 is disposed, for example, at the left front part of the rotating frame 3a. A driver's seat, an operation lever, an operation pedal, and the like are disposed in the cab 12. A counterweight 15 is disposed at the rear of the upper rotating body 3. The counterweight 15 is a weight for balancing. Note that Fig. 2 shows a state in which a part of the outer wall 13 located at the left rear part of the upper rotating body 3 has been removed, but this part is blocked in the actual work machine 1.

[0025] The work machine 1 is equipped with a plurality of actuators. Each of the plurality of actuators operates by receiving a supply of hydraulic oil discharged from a hydraulic pump 98. The plurality of actuators include a boom cylinder 9 for raising and lowering the boom 6, an arm cylinder 10 for rotating the arm 7, a tip attachment cylinder 11 for rotating the tip attachment 8, and a hydraulic motor (not shown) for rotating the upper rotating body 3 relative to the lower traveling body 2.

[0026] The upper rotating body 3 of the work machine 1 has a machine room 80 surrounded by an outer wall 13. In the specific example shown in Figures 2 and 3, the machine room 80 is formed rearward of the cab 12, but for example, it may be formed on the side (right side) of the cab 12, or it may be formed both rearward and sideward of the cab 12. The outer wall 13 includes, for example, as shown in Figure 2, a side wall 13A arranged so as to cover the machine room 80 from the side, and a top wall 13B arranged so as to cover the machine room 80 from above.

[0027] The upper rotating body 3 has an intake port 71 and an exhaust port 75. The intake port 71 is an opening for drawing air (outside air) outside the machine room 80 into the machine room 80 as cooling air. The exhaust port 75 is an opening for discharging air inside the machine room 80 to the outside of the machine room 80. Each of the intake port 71 and the exhaust port 75 may be formed in the outer wall 13. In this embodiment, the intake port 71 is formed in the left rear part of the upper rotating body 3, and the exhaust port 75 is formed in the right rear part of the upper rotating body 3. However, the intake port 71 may be formed in the right rear part of the upper rotating body 3, and the exhaust port 75 may be formed in the left and right rear parts of the upper rotating body 3. In addition, each of the intake port 71 and the exhaust port 75 may be formed in other parts of the upper rotating body 3. In this embodiment, an exhaust port 75A is also formed in the upper part of the engine room 82.

[0028] The machine room 80 includes an intake chamber 81 and an engine room 82. In this embodiment, the intake port 71, the intake chamber 81, the engine room 82, and the exhaust port 75 are arranged in this order in the left-right direction when viewed from above as shown in FIG.

[0029] The features of the work machine 1 according to this embodiment will be described below.

[0030] [First feature] The work machine 1 includes a cooling fan 20, an engine 30, a heat exchanger 40, and an intake guide 50. The cooling fan 20 generates an air flow AF that flows through the intake port 71, the intake chamber 81, and the engine chamber 82 in this order. The heat exchanger 40 is interposed between the intake chamber 81 and the engine chamber 82. The intake guide 50 guides the air that flows from the intake port 71 into the intake chamber 81 to the heat exchanger 40. As shown in FIG. 3, the intake port 71, the heat exchanger 40, and the engine 30 are arranged so as to be aligned in the left-right direction (an example of one direction) when viewed from above. The engine 30 drives a hydraulic pump 98.

[0031] As shown in FIGS. 4 and 5, the intake guide 50 includes a heat exchanger-side upper wall 52 and an intake port-side upper wall 51.

[0032] The heat exchanger-side upper wall 52 is located upstream of the heat exchanger 40 in the air flow AF. The heat exchanger-side upper wall 52 is disposed so as to extend obliquely downward from the upper end 41 of the heat exchanger 40 toward the intake port-side upper wall 51 to a position lower than the upper end 41 of the heat exchanger 40.

[0033] The intake port side upper wall 51 is disposed so as to extend obliquely upward from the lower end portion 52A of the heat exchanger side upper wall 52 toward the intake port 71. The intake port side upper wall 51 extends obliquely upward from the lower end portion 52A of the heat exchanger side upper wall 52 toward the intake port 71 while curving in an arch shape.

[0034] The upper wall including the intake port side upper wall 51 and the heat exchanger side upper wall 52 has a shape that protrudes downward to a position lower than the upper end 41 of the heat exchanger 40 in an intermediate portion between the upstream end of the intake port side upper wall 51 and the downstream end of the heat exchanger side upper wall 52. In other words, the upper surface of the upper wall has a recess that is recessed downward.

[0035] In the work machine 1 having the first characteristic, as shown in FIG. 5, the heat exchanger-side upper wall 52 and the intake port-side upper wall 51 are interposed between the upper part of the heat exchanger 40 and the intake port 71, so that the engine sound passing through the upper part of the heat exchanger 40 is attenuated by the heat exchanger-side upper wall 52 and the intake port-side upper wall 51. Furthermore, since the intake guide 50 includes not only the heat exchanger-side upper wall 52 but also the intake port-side upper wall 51, it is possible to suppress the intrusion of foreign matter such as rainwater and dust into the intake chamber 81, compared to a case in which the area corresponding to the intake port-side upper wall 51 is open upward. Therefore, it is possible to suppress the intrusion of foreign matter into the intake chamber 81 while reducing the noise caused by the engine sound that passes through the heat exchanger 40 and leaks to the outside from the intake port 71. Moreover, the air flowing into the intake chamber 81 from the intake port 71 is smoothly guided to the heat exchanger 40 by the intake port-side upper wall 51 and the heat exchanger-side upper wall 52.

[0036] [Second feature] In a work machine 1 having the second characteristic, the intake port side upper wall 51 continues from the lower end portion 52A of the heat exchanger side upper wall 52 to the upper end portion 72 of the intake port 71. In this case, as shown in Figures 4 and 5, the intake port side upper wall 51 and the heat exchanger side upper wall 52 can cover the intake chamber 81 from above in the range from the heat exchanger 40 to the intake port 71, so that foreign matter such as rainwater and dust can be more effectively prevented from entering the intake chamber 81.

[0037] [Third feature] In a work machine 1 having the third feature, the air intake 71 is formed only on the side of the air intake chamber 81, as shown in Figures 4 and 5. In this case, foreign matter such as rainwater and dust can be more effectively prevented from entering the air intake chamber 81.

[0038] As shown in FIG. 3, the counterweight 15 of the upper rotating body 3 is disposed so as to surround the rear of the machine room 80. As shown in FIG. 4 and FIG. 5, a part of the counterweight 15 is disposed at a position that defines the lower part of the intake port 71. As shown in FIG. 4 and FIG. 5, the thickness of the counterweight 15 in the direction of the air flow AF is greater than the thickness of the side wall 13A of the outer wall 13. The upstream end of the intake port side upper wall 51 (the upstream end in the direction of the air flow AF) defines the upper part of the intake port 71. As shown in FIG. 5, the inner surface 15S of the counterweight 15 is located inside in the left-right direction from the upstream end of the intake port side upper wall 51. In other words, the inner surface 15S of the counterweight 15 is disposed inside the intake chamber 81 (the first intake chamber 81A described later). This makes it possible to more effectively prevent foreign matter such as rainwater and dust from entering the intake chamber 81.

[0039] [Fourth feature] In the work machine 1 having the fourth characteristic, as shown in Fig. 5, the lower end portion 52A of the heat exchanger side upper wall 52 is located below the lower end portion 73 of the intake port 71. In this case, as shown in Fig. 5, the direction in which the engine sound leaks out from the intake port 71 to the outside can be directed obliquely upward, so that the noise felt by people near the work machine 1 can be suppressed. In Fig. 5, the range indicated by the dashed line connecting the lower end portion 52A of the heat exchanger side upper wall 52 (the upper end portion of the opening on the upstream side of the airflow AF in the duct 55) and the lower end portion 73 of the intake port 71 and the dashed line connecting the lower end portion of the opening on the upstream side of the airflow AF in the duct 55 and the upper end portion 72 of the intake port 71 indicates the range of sound (direct sound) that is transmitted in a straight line from the duct 55 to the intake port 71, among the noise that leaks out from the intake port 71 to the outside of the intake chamber 81.

[0040] 4, the airflow AF flowing from the intake port 71 into the first intake chamber 81A (described later) flows in a substantially Z-shape (or S-shape) into the second intake chamber 81B. This effectively reduces noise caused by the engine sound that passes through the heat exchanger 40 and leaks to the outside from the intake port 71.

[0041] [Fifth feature] In a work machine 1 having a fifth characteristic, as shown in Figures 3 to 5, the cooling fan 20 is disposed in the engine compartment 82. In this fifth aspect, since not only the engine 30 but also the cooling fan 20 are disposed in the engine compartment 82, not only can the noise caused by the engine sound passing through the heat exchanger 40 and leaking to the outside from the intake port 71 be reduced, but also the noise caused by the sound of the cooling fan 20 passing through the heat exchanger 40 and leaking to the outside from the intake port 71 be reduced.

[0042] [6th feature] In a work machine 1 having the sixth feature, air intake 71 is formed above rotation shaft 21 of cooling fan 20. In this case, since air intake 71 is formed above rotation shaft 21 of cooling fan 20, the direction in which sound of cooling fan 20 leaks out from air intake 71 to the outside can be directed obliquely upward.

[0043] [7th feature] The work machine 1 having the seventh characteristic further includes a partition 90 that separates the intake chamber 81 and the engine room 82. In this case, the intake chamber 81 and the engine room 82 are separated by the partition 90, so that engine noise passing through an area other than the heat exchanger 40 and heading toward the intake port 71 can be reduced. In this embodiment, as shown in Figs. 4 and 5, the partition 90 includes an upper partition 90A that closes the gap between the heat exchanger 40 and the top wall 13B of the outer wall 13, and a lower partition 90B that closes the gap between the heat exchanger 40 and a floor surface (for example, the upper surface of the revolving frame 3a). Also, as shown in Fig. 3, the partition 90 may further include a side partition 90C that closes the gap between the heat exchanger 40 and the side wall 13A of the outer wall 13.

[0044] [8th feature] In a work machine 1 having an eighth characteristic, as shown in Figs. 3 to 5, the intake guide 50 includes a duct 55 located upstream of the heat exchanger 40 in the airflow AF. The duct 55 includes a heat exchanger-side upper wall 52. In this case, the air guided to the duct 55 along the intake port-side upper wall 51 is further guided by the duct 55 to efficiently flow into the heat exchanger 40. As shown in Fig. 4, the intake port-side upper wall 51 and the duct 55 are formed from separate members, which has the advantage of making it easier to mold these two members.

[0045] The duct 55 is an annular member including a heat exchanger-side upper wall 52 that covers the second air intake chamber 81B from above, which will be described later, a heat exchanger-side lower wall 56 that covers the second air intake chamber 81B from below, a heat exchanger-side front wall 57 that covers the second air intake chamber 81B from the front, and a heat exchanger-side rear wall 58 that covers the second air intake chamber 81B from the rear.

[0046] [9th feature] The work machine 1 having the ninth feature is further provided with a filter 85 arranged in the duct 55, as shown in Figs. 3 to 5. The filter 85 divides the air intake chamber 81 into a first air intake chamber 81A from the air intake port 71 to the filter 85, and a second air intake chamber 81B from the filter 85 to the heat exchanger 40. In this case, since the filter 85 is arranged in the duct 55, it is possible to cause air purified by the filter 85 to flow into the engine compartment 82.

[0047] [10th Feature] In the work machine 1 having the tenth feature, as shown in Fig. 3 to Fig. 5, the air intake guide 50 includes a bottom wall 54 that guides air to the second air intake chamber 81B at the bottom of the first air intake chamber 81A. In this case, the air that flows from the air intake port 71 into the air intake chamber 81 and flows through the bottom of the air intake chamber 81 is smoothly guided along the bottom wall 54 to the duct 55. In this embodiment, the bottom wall 54 also serves as a cover for the equipment placed underneath.

[0048] [11th Feature] In a work machine 1 having the eleventh characteristic, as shown in Figures 2 and 3, the right rear and left rear parts of the upper rotating body 3 have a curved shape when viewed from above, with part of the air intake port 71 formed in the left rear part and the other part of the air intake port 71 formed in the left side part (left side part of the upper rotating body 3) extending in the front-to-rear direction. Because part of the air intake port 71 is formed in the curved left rear part, it is easy to ensure the opening area of ​​the air intake port 71, as shown by the dashed line in Figure 3.

[0049] As shown in Fig. 4, an air cleaner 95 is disposed in the first air intake chamber 81A. The air cleaner 95 purifies the air in the first air intake chamber 81A, and then supplies the purified air to the engine 30 through a pipe 95A. Also, a muffler 97 is disposed in the engine chamber 82, to which exhaust gas discharged from the engine 30 is supplied.

[0050] [Variations] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and includes, for example, the following modified examples.

[0051] (A) Mesh material 6, the work machine 1 includes a mesh member 93 that is placed at the intake port 71, and the mesh member 93 is placed in an inclined position with respect to the vertical direction so that a lower end 93B of the mesh member 93 is located downstream of an upper end 93A of the mesh member 93 in the airflow AF. In this case, the mesh member 93 can capture a large amount of dust when air flows from the intake port 71 into the intake chamber 81. In addition, because the mesh member 93 is placed in an inclined position as described above, dust is more likely to fall from the mesh member 93 due to its own weight when the engine 30 is stopped.

[0052] (B) Upper wall of heat exchanger In the above embodiment, the heat exchanger side upper wall 52 is arranged to extend diagonally downward from the upper end 41 of the heat exchanger 40 to a position lower than the upper end 41, but it may also be arranged to extend diagonally downward from a member (e.g., partition 90) connected to the upper end 41 of the heat exchanger 40 to a position lower than the upper end 41 of the heat exchanger 40.

[0053] (C) Upper wall on the intake side In the embodiment shown in Figures 4 and 5, the intake port side upper wall 51 extends diagonally upward toward the intake port 71 while curving in an arch shape from the lower end portion 52A of the heat exchanger side upper wall 52, but it may also extend diagonally upward in a straight line from the lower end portion 52A of the heat exchanger side upper wall 52 toward the intake port 71, for example.

[0054] (D) Air Intake 4 and 5, the intake port 71 is formed only on the side of the intake chamber 81. That is, the intake port 71 is formed in the side wall 13A of the outer wall 13, and is not formed in the top wall 13B, but this is not limited to the embodiment. In the work machine according to the present disclosure, the intake port 71 may be formed in the side portion (side wall 13A) of the intake chamber 81, with a portion of the intake port 71 extending to the side end portion of the top wall 13B.

[0055] (E) Cooling fan 3 to 5, the cooling fan 20 is disposed in the engine compartment 82, but may be disposed in, for example, the intake chamber 81. In this case, the cooling fan 20 may be driven by a driving source other than the engine 30, and is configured to generate an air flow AF that flows through the intake port 71, the intake chamber 81, and the engine compartment 82 in this order.

[0056] (F) Partitions In the embodiment shown in Figures 3-5, the partition 90 includes an upper partition 90A, a lower partition 90B, and a side partition 90C, but at least one of the upper partition 90A, the lower partition 90B, and the side partition 90C can be omitted.

[0057] (G) One-way 3, the intake port 71, the heat exchanger 40, and the engine 30 are arranged so as to be aligned in the left-right direction (one example of one direction) when viewed from above, but are not limited to this specific example. The intake port 71, the heat exchanger 40, and the engine 30 may be arranged so as to be aligned in the front-rear direction (another example of one direction) when viewed from above, or may be arranged so as to be aligned in a diagonal direction between the left-right direction and the front-rear direction. [Explanation of symbols]

[0058] 1: Work machine 3: Upper rotating body 12: Cab 13: Exterior wall 13A: Side wall 13B: Ceiling wall 14: Machine room 15: Counterweight 15S: Inner surface of counterweight 20: Cooling fan 21: Cooling fan shaft 30: Engine 40: Heat exchanger 41: Upper end of heat exchanger 50: Intake guide 51: Upper wall on the intake side 52: Upper wall of heat exchanger side 52A: Lower end of upper wall on heat exchanger side 54: Lower wall 55: Duct 71: Air intake 72: Upper end of intake port 73: Lower end of intake port 75: Exhaust port 80: Machine room 81: Air intake chamber 81A: First intake chamber 81B: Second intake chamber 82: Engine room 85: Filter 90: Partition 93: Mesh material 93A: Upper end of mesh member 93B: Lower end of mesh member AF: Air flow

Claims

1. a cooling fan for generating an air flow that flows through the intake port, the intake chamber, and the engine chamber in this order; an engine disposed in the engine compartment; a heat exchanger interposed between the intake chamber and the engine chamber; an intake guide that guides the air flowing into the intake chamber from the intake port to the heat exchanger, The intake guide includes a heat exchanger side upper wall and an intake port side upper wall, the heat exchanger-side upper wall is located upstream of the heat exchanger in the air flow and is disposed so as to extend obliquely downward from an upper end of the heat exchanger or a member connected to the upper end to a position lower than the upper end, The intake port side upper wall is disposed so as to extend obliquely upward from a lower end portion of the heat exchanger side upper wall toward the intake port.

2. The work machine according to claim 1 , wherein the intake port side upper wall is continuous from the lower end of the heat exchanger side upper wall to an upper end of the intake port.

3. The work machine according to claim 1 , wherein the air intake is formed only in a side portion of the air intake chamber.

4. The work machine according to claim 1 , wherein the lower end of the heat exchanger side upper wall is located lower than a lower end of the intake port.

5. The work machine of claim 1 , wherein the cooling fan is disposed in the engine compartment.

6. The work machine according to claim 5 , wherein the air intake is formed above a rotation axis of the cooling fan.

7. The work machine of claim 1 , further comprising a partition separating the intake chamber and the engine chamber.

8. the intake guide includes a duct located upstream of the heat exchanger in the air flow, The work machine of claim 1 , wherein the duct includes the heat exchanger side upper wall.

9. further comprising a filter disposed in the duct; 9. The work machine according to claim 8, wherein the filter divides the air intake chamber into a first air intake chamber from the air intake port to the filter and a second air intake chamber from the filter to the heat exchanger.

10. The work machine according to claim 9 , wherein the intake guide includes a lower wall that guides air to the second intake chamber at a lower portion of the first intake chamber.

11. The right rear and left rear parts of the upper rotating body of the working machine have a curved shape when viewed from above, The work machine of claim 1 , wherein at least a portion of the air intake is formed in the right rear portion or the left rear portion.

12. Further comprising a mesh member disposed in the intake port, The work machine according to claim 1 , wherein the mesh member is disposed in an inclined position with respect to the vertical direction such that a lower end of the mesh member is located downstream of an upper end of the mesh member in the air flow.

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