Work machine

Abstract

To provide a work machine capable of improving an air flow in a machine room while reducing noise due to engine sound leaked from an exhaust port to the outside.SOLUTION: A work machine includes: an outer wall 13 surrounding a machine room 80; an engine 30 arranged in the machine room 80; and a first partition wall 61 arranged in the machine room 80. The outer wall 13 has an exhaust port 75 for exhausting air in the machine room 80 to the outside of the machine room 80. The first partition wall 61 has: a vertical wall part 64 interposed between the engine 30 and the exhaust port 75 and extending upward; and a lateral wall part 65 extending laterally from an upper portion of the vertical wall part 64 toward the exhaust port 75.SELECTED DRAWING: Figure 4

Description

[Technical field]

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

[0002] In general, a work machine includes an exterior wall surrounding a machine room and an engine disposed in the machine room. An exhaust port is formed in the exterior wall for discharging air from the machine room to the outside of the machine room, and engine noise generated by the engine leaks from the exhaust port to the outside of the machine room, causing noise. Therefore, it is desirable to reduce noise caused by the engine noise.

[0003] Patent Document 1 discloses a work machine in which a first exhaust port that discharges air in the axial direction of the engine output shaft and a second exhaust port that discharges air upward are provided close to each other. This work machine is equipped with an exhaust guide that changes the flow direction of air discharged from the first exhaust port in the axial direction of the engine output shaft to an upward direction on the upwind side of the second exhaust port. This work machine can avoid deterioration of the flow due to the collision of the exhaust flows from the first exhaust port and the second exhaust port, and can reduce noise emitted sideways from the first exhaust port. In other words, the technology described in Patent Document 1 takes measures against engine noise and improves the air flow at the first exhaust port (air outlet) where the exhaust guide is provided. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2011-208632 A Summary of the Invention [Problem to be solved by the invention]

[0005] The technology described in Patent Document 1 does not take into consideration the air flow in the machinery room. Therefore, it is desirable to improve the air flow in the machinery room while reducing noise caused by engine noise leaking to the outside from the exhaust port.

[0006] An object of the present disclosure is to provide a work machine that can improve airflow in a machine room while reducing noise caused by engine noise leaking to the outside from an exhaust port. [Means for solving the problem]

[0007] The working machine of the first aspect comprises an outer wall surrounding a machinery room, an engine arranged in the machinery room, and a first partition arranged in the machinery room, wherein the outer wall has an exhaust port for discharging air in the machinery room to the outside of the machinery room, and the first partition has a vertical wall portion interposed between the engine and the exhaust port and extending upward, and a horizontal wall portion extending laterally from an upper portion of the vertical wall portion toward the exhaust port.

[0008] In the work machine according to the first aspect, a first partition having a vertical wall portion interposed between the engine and the exhaust port and a horizontal wall portion extending laterally from an upper portion of the vertical wall portion toward the exhaust port is disposed in the machinery room, so that engine noise leaking to the outside from the exhaust port is reduced, and air in the machinery room is smoothly guided toward the exhaust port. That is, the work machine according to the first aspect can reduce engine noise and improve air flow in the machinery room. Therefore, the work machine according to the first aspect can improve air flow in the machinery room while reducing noise caused by engine noise leaking to the outside from the exhaust port.

[0009] 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 exhaust port is a first exhaust port, the outer wall further has a second exhaust port that discharges the air in the machine room to the outside of the machine room, the second exhaust port is formed below the first exhaust port, and the lateral wall portion has an upper guide surface that is an upper surface that guides the air in the machine room to the first exhaust port, and a lower guide surface that is a lower surface that guides the air in the machine room to the second exhaust port. In this second aspect, the air in the machine room is smoothly guided to the first exhaust port and the second exhaust port, respectively, by the upper guide surface and the lower guide surface of the lateral wall portion.

[0010] A third aspect is preferably the working machine according to the first or second aspect further comprising the following configuration. That is, the working machine according to the third aspect preferably further comprises a hydraulic pump driven by the engine, a muffler arranged on the hydraulic pump to reduce exhaust noise of the engine, and a second partition interposed between the hydraulic pump and the muffler. In this third aspect, the second partition can separate an area in which the hydraulic pump is arranged from an area in which the muffler is arranged, so that even if hydraulic oil is splashed from the hydraulic pump to the surrounding area, the hydraulic oil is prevented from adhering to the muffler.

[0011] A fourth aspect is preferably the working machine according to the third aspect further comprising the following configuration. That is, in the working machine according to the fourth aspect, it is preferable that the second partition is disposed between the hydraulic pump and the muffler, extending from a position adjacent to the engine toward a lower portion of the vertical wall portion. In this fourth aspect, the second partition can not only separate an area in which the hydraulic pump is disposed from an area in which the muffler is disposed, but can also guide air around the engine to the vertical wall portion of the first partition.

[0012] 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 an upper end of the exhaust port is located above an upper end of the engine, an upper end of the first partition is located above an upper end of the engine, and a lower end of the first partition is located below an upper end of the engine. In this fifth aspect, when the exhaust port is formed at a position offset upwardly relative to the engine in the vertical direction, the first partition is arranged at a position offset upwardly relative to the engine so as to be effectively interposed between the engine and the exhaust port. This makes it possible to effectively block a portion of the engine sound traveling from the engine toward the exhaust port.

[0013] 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 exhaust port is formed in a side wall of the outer wall, and the first partition is covered by a top wall of the outer wall located above the first partition. In this sixth aspect, since the exhaust port is formed in the side wall of the outer wall, and the top wall of the outer wall covers the first partition from above, it is possible to prevent foreign matter such as rainwater and dust from entering the machine room.

[0014] 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, in the work machine according to the seventh aspect, it is preferable that the right rear portion and the left rear portion of the outer wall have a curved shape when viewed from above, and the exhaust port is formed in the right rear portion or the left rear portion. In this seventh aspect, since at least a part of the exhaust port is formed in the curved right rear portion or the left rear portion, it is easier to ensure the opening area of ​​the exhaust port.

[0015] 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 exhaust port is a first exhaust port, and the outer wall further has a third exhaust port that exhausts the air in the machine room to the outside of the machine room, and the third exhaust port may be formed in a top wall of the outer wall. In this eighth aspect, it becomes easier to ensure the opening area of ​​the outlet through which the air in the machine room is exhausted to the outside of the machine room.

[0016] A ninth aspect is preferably the working machine according to the eighth aspect further comprising the following configuration. That is, the working machine according to the ninth aspect further comprises a third partition disposed below the third exhaust port and above the engine, and the third partition preferably has an upper surface that overlaps with the third exhaust port when viewed from above. In this ninth aspect, it is possible to prevent rainwater, dust, and other foreign matter from entering the machinery room through the third exhaust port. In this ninth aspect, it is more preferable that the upper surface of the third partition has a size (area) such that it overlaps with the entire third exhaust port when viewed from above. In this case, it is possible to more effectively prevent rainwater, dust, and other foreign matter from entering the machinery room through the third exhaust port. Effect of the Invention

[0017] According to the present disclosure, a work machine is provided that can improve the air flow in the machine room while reducing noise caused by engine noise leaking to the outside from the exhaust port. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a left side view showing 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 cross-sectional view taken along line AA in FIG. [Diagram 5] FIG. 2 is a right side view showing the rear part of the work machine. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] An embodiment of the present disclosure will be described with reference to the drawings.

[0020] 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).

[0021] 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.

[0022] 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, operating levers, operating pedals, etc. 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.

[0023] The work machine 1 includes a hydraulic pump 98, which will be described later, and a plurality of actuators. Each of the plurality of actuators operates by receiving a supply of hydraulic oil discharged from the 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.

[0024] 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.

[0025] The outer wall 13 of the upper rotating body 3 has an air intake port 71 and a first exhaust port 75. The air intake port 71 is an opening for drawing air outside the machine room 80 (outside air) into the machine room 80 as cooling air. The first exhaust port 75 is an opening for discharging air in the machine room 80 to the outside of the machine room 80. The outer wall 13 may further have a second exhaust port 76 and a third exhaust port 77. Each of the second exhaust port 76 and the third exhaust port 77 is an opening for discharging air in the machine room 80 to the outside of the machine room 80.

[0026] In this embodiment, the intake port 71 is formed in the left rear part of the upper rotating body 3, and the first exhaust port 75 and the second exhaust port 76 are formed in the right rear part of the upper rotating body 3, but the intake port 71 may be formed in the right rear part of the upper rotating body 3, and the first exhaust port 75 and the second exhaust port 76 may be formed in the left rear part of the upper rotating body 3. Also, each of the intake port 71, the first exhaust port 75 and the second exhaust port 76 may be formed in another part of the upper rotating body 3. As shown in FIG. 2, the third exhaust port 77 is formed near the center of the rear part of the upper rotating body 3 (near the center in the left-right direction of the top wall 13B), but the part where the third exhaust port 77 is formed is not limited to the specific example shown in FIG. 2.

[0027] 3 and 4, the machine chamber 80 includes an intake chamber 81 and an engine chamber 82. In this embodiment, the intake port 71, the intake chamber 81, the engine chamber 82, and the exhaust ports 75, 76 are arranged in this order in the left-right direction when viewed from above as shown in FIG.

[0028] The working machine 1 includes a cooling fan 20, an engine 30, a heat exchanger 40, an intake guide 50, and a hydraulic pump 98. The cooling fan 20 generates an air flow AF that flows through the intake port 71, the intake chamber 81, the engine chamber 82, and the first exhaust port 75 in this order. The intake guide 50 is disposed in the intake chamber 81. The heat exchanger 40 is interposed between the intake chamber 81 and the engine chamber 82. The intake guide 50 guides air that flows from the intake port 71 into the intake chamber 81 to the heat exchanger 40. The cooling fan 20, the engine 30, and the hydraulic pump 98 are disposed in the engine chamber 82. The engine 30 drives the hydraulic pump 98.

[0029] As shown in Fig. 4, the intake guide 50 includes an intake port side upper wall 51, an intake port side lower wall 54, and a duct 55 (heat exchanger side duct). The intake port side upper wall 51 and the intake port side lower wall 54 guide air flowing from the intake port 71 into the intake chamber 81 to the duct 55. The duct 55 further guides the guided air to the heat exchanger 40. A filter 85 is disposed in the duct 55. The intake port side upper wall 51 is disposed at the upper part of the intake chamber 81, and the intake port side lower wall 54 is disposed at the lower part of the intake chamber 81.

[0030] 4, the airflow AF flowing from the intake port 71 into the intake chamber 81 is guided by the intake guide 50 so that it flows in a roughly Z-shape (or S-shape) into the heat exchanger 40. By forming such a Z-shaped passage, noise caused by engine sound that passes through the heat exchanger 40 and leaks to the outside from the intake port 71 is effectively reduced.

[0031] The work machine 1 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 FIG. 4, 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.

[0032] 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 a portion of the air intake port 71 formed in the left rear part and the other portion 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-rear direction. Since a portion 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 FIG.

[0033] 3 and 4, an air cleaner 95 is disposed in the intake chamber 81. The air cleaner 95 purifies the air in the intake chamber 81, and then supplies the purified air to the engine 30 through unillustrated piping.

[0034] The work machine 1 includes a hydraulic pump 98 driven by the engine 30, and a plurality of mufflers 97 disposed on the hydraulic pump 98 and configured to reduce the exhaust noise of the engine 30. The hydraulic pump 98 and the plurality of mufflers 97 are disposed in the engine compartment 82.

[0035] The features of the work machine 1 according to this embodiment will be described below.

[0036] [First feature] The work machine 1 includes a first partition 61 disposed in the machinery room 80. In this embodiment, the first partition 61 is disposed in the engine room 82 of the machinery room 80. The first partition 61 has a vertical wall portion 64 interposed between the engine 30 and the first exhaust port 75 and extending upward, and a horizontal wall portion 65 extending laterally from an upper portion of the vertical wall portion 64 toward the first exhaust port 75.

[0037] In this work machine 1, the first partition 61 having a vertical wall portion 64 interposed between the engine 30 and the first exhaust port 75 and a horizontal wall portion 65 extending laterally from an upper portion of the vertical wall portion 64 toward the first exhaust port 75 is disposed in the engine compartment 82 of the machinery room 80, so that engine noise leaking to the outside from the first exhaust port 75 is reduced, and air is smoothly guided toward the first exhaust port 75 in the engine compartment 82 of the machinery room 80. That is, this work machine 1 can reduce the noise of the engine 30 and improve the air flow in the engine compartment 82 of the machinery room 80. Therefore, the work machine 1 can improve the air flow in the engine compartment 82 of the machinery room 80 while reducing noise caused by engine noise leaking to the outside from the first exhaust port 75.

[0038] In the specific example shown in Fig. 4, the first partition 61 has a substantially L-shape when the work machine 1 is viewed from behind (i.e., in a rear view). The vertical wall portion 64 is disposed so as to extend in the vertical direction, and the horizontal wall portion 65 is disposed so as to extend in the horizontal direction, but the extending directions of the vertical wall portion 64 and the horizontal wall portion 65 are not limited to the specific example shown in Fig. 4. For example, the "upward" direction in which the vertical wall portion 64 extends may be a direction parallel to the vertical direction, or a direction inclined relative to the vertical direction. The "lateral direction" in which the horizontal wall portion 65 extends may be a direction parallel to the horizontal direction, or a direction inclined relative to the horizontal direction.

[0039] In the specific example shown in Fig. 4, each of the vertical wall portion 64 and the horizontal wall portion 65 has a flat plate-like shape, but the shapes of the vertical wall portion 64 and the horizontal wall portion 65 are not limited to the specific example shown in Fig. 4. For example, the vertical wall portion 64 may have a curved shape, or may have a shape including a flat plate-like portion and a curved portion. Similarly, the horizontal wall portion 65 may have a curved shape, or may have a shape including a flat plate-like portion and a curved portion.

[0040] The vertical wall portion 64 is disposed at a position such that the vertical wall portion 64 blocks part or all of the engine sound generated by the engine 30 and traveling straight toward the first exhaust port 75. The vertical wall portion 64 is disposed at a position such that the vertical wall portion 64 covers part or all of the engine 30 when the engine 30 is viewed from the first exhaust port 75.

[0041] 4, the range indicated by the arrows between straight lines L1 and L2 indicates the range of sound (direct sound) that is transmitted in a linear manner from the engine 30 and muffler 97 to the first exhaust port 75, among the sound that leaks from the first exhaust port 75 to the outside of the machine room 80. The straight line L1 is a straight line that passes through the upper end 75A of the first exhaust port 75 and touches the first partition wall 61 when the work machine 1 is viewed from behind, and indicates the upper limit of the direct sound. The straight line L2 is a straight line that passes through the lower end 75B of the first exhaust port 75 and touches the muffler 97 when the work machine 1 is viewed from behind, and indicates the lower limit of the direct sound.

[0042] In the specific example shown in FIG. 4, since the upper end of the muffler 97 is located above the upper end 61A of the first partition 61 and the upper end 30A of the engine 30, the straight line L2 indicating the lower limit of the direct sound is a straight line that passes through the lower end 75B of the first exhaust port 75 and is tangent to the muffler 97. For example, when the upper end 30A of the engine 30 is located above the upper end of the muffler 97 and the upper end 61A of the first partition 61, the straight line L2 indicating the lower limit of the direct sound may be a straight line that passes through the lower end 75B of the first exhaust port 75 and is tangent to the engine 30. Also, for example, when the upper end 61A of the first partition 61 is located above the upper end 30A of the engine 30 and the upper end of the muffler 97, the straight line L2 indicating the lower limit of the direct sound may be a straight line that passes through the lower end 75B of the first exhaust port 75 and is tangent to the first partition 61.

[0043] As shown in FIG. 4, the range in which the engine sound and the sound of the muffler 97 leak to the outside from the first exhaust port 75 is a range relatively high above the ground, so the noise felt by people near the work machine 1 can be reduced.

[0044] 4, the airflow AF that flows into the engine compartment 82 flows in a roughly Z-shape (or S-shape) to reach the first exhaust port 75 or the second exhaust port 76, and is exhausted from the first exhaust port 75 or the second exhaust port 76 to the outside of the machinery compartment 80. This effectively reduces noise caused by engine noise leaking to the outside from the first exhaust port 75 and the second exhaust port 76.

[0045] [Second feature] In the work machine 1 having the second feature, the outer wall 13 further has a second exhaust port 76 that discharges air in the engine chamber 82 of the machinery room 80 to the outside of the machinery room 80. The second exhaust port 76 is formed below the first exhaust port 75, and the lateral wall portion 65 has an upper guide surface 65A that is an upper surface that guides air in the engine chamber 82 of the machinery room 80 to the first exhaust port 75, and a lower guide surface 65B that is a lower surface that guides air in the engine chamber 82 of the machinery room 80 to the second exhaust port 76. In this case, the air in the engine chamber 82 of the machinery room 80 is smoothly guided to the first exhaust port 75 and the second exhaust port 76 by the upper guide surface 65A and the lower guide surface 65B of the lateral wall portion 65.

[0046] 4, the side wall portion 65 defines the position of the lower end 75B of the first exhaust port 75 and also defines the position of the upper end 76A of the second exhaust port 76. The position of the upper end 75A of the first exhaust port 75 is defined by the top wall 13B or the side wall 13A of the outer wall 13. The position of the lower end 76B of the second exhaust port 76 is defined by the upper surface of the counterweight 15, but may also be defined by the side wall 13A of the outer wall 13.

[0047] The thickness (thickness in the direction of the airflow AF) of the upper surface of the counterweight 15 is greater than the thickness of the side wall 13A of the outer wall 13. The upstream end of the upper surface of the counterweight 15 in the direction of the airflow AF is located upstream of the airflow AF from the downstream end 61C of the first partition 61. This effectively prevents foreign matter such as rainwater and dust from entering the machine room 80 (engine room 82) through the second exhaust port 76. The downstream end 61C of the first partition 61 is the downstream end (right end) of the first partition 61 in the airflow AF, and is the downstream end 61C of the lateral wall portion 65.

[0048] In this embodiment, the horizontal wall portion 65 extends in the horizontal direction (right direction) from the vertical wall portion 64 to a position corresponding in the left-right direction to the side surface (right side surface) of the side wall 13A of the outer wall 13. However, the position of the side end (right end) of the horizontal wall portion 65 does not have to be a position corresponding to the side surface (right side surface) of the side wall 13A, and may be a position between the upper end of the vertical wall portion 64 and the side surface (right side surface) of the side wall 13A.

[0049] The vertical wall portion 64 is not only interposed between the engine 30 and the first exhaust port 75, but also between the engine 30 and the second exhaust port 76. In this case, the vertical wall portion 64 is disposed at a position such that the vertical wall portion 64 blocks part or all of the engine sound generated by the engine 30 traveling straight toward the second exhaust port 76. The vertical wall portion 64 is disposed at a position such that the vertical wall portion 64 covers part or all of the engine 30 when the engine 30 is viewed from the second exhaust port 76.

[0050] 4, the straight line L3 is a straight line that passes through the downstream end 61C of the first partition 61 and the lower end 61B of the first partition 61 when the working machine 1 is viewed from behind. The lower end 61B of the first partition 61 is located lower than the lower end 76B of the second exhaust port 76.

[0051] In this embodiment, when the work machine 1 is viewed from behind, the engine 30 is located upstream of the straight line L3 in the air flow AF. This makes it possible to effectively prevent engine sound generated from the engine 30 from leaking to the outside through the second exhaust port 76. Also, in this embodiment, when the work machine 1 is viewed from behind, the muffler 97 is located upstream of the straight line L3 in the air flow AF. This makes it possible to effectively prevent sound generated from the muffler 97 from leaking to the outside through the second exhaust port 76.

[0052] [Third feature] The work machine 1 having the third feature is further provided with a second partition 62 interposed between the hydraulic pump 98 and the multiple mufflers 97. The second partition 62 can separate the area in which the hydraulic pump 98 is arranged from the area in which the multiple mufflers 97 are arranged, so that even if hydraulic oil is splashed from the hydraulic pump 98 to the surrounding area, the hydraulic oil is prevented from adhering to the muffler 97.

[0053] 4, the multiple mufflers 97 include a first muffler 97 and a second muffler 97 disposed above the first muffler 97. The multiple mufflers 97 are disposed directly above the hydraulic pump 98, but do not necessarily have to be disposed directly above the hydraulic pump 98. The multiple mufflers 97 are located downstream of the airflow AF from the engine 30. The hydraulic pump 98 is located downstream of the airflow AF from the engine 30. Note that the multiple mufflers 97 may be located upstream of the airflow AF from the engine 30, and the hydraulic pump 98 may be located upstream of the airflow AF from the engine 30.

[0054] [Fourth feature] In a work machine 1 having the fourth characteristic, the second partition 62 is disposed between the hydraulic pump 98 and the muffler 97, extending from a position adjacent to the engine 30 toward the lower part of the vertical wall portion 64. In this case, the second partition 62 can not only separate the area in which the hydraulic pump 98 is disposed from the area in which the muffler 97 is disposed, but can also guide the air (air flow AF) around the engine 30 to the vertical wall portion 64 of the first partition 61.

[0055] The second partition 62 has an upstream end 62A, which is one end located adjacent to the engine 30, and a downstream end 62B, which is the other end adjacent to or connected to the lower part of the vertical wall portion 64. The second partition 62 is disposed so as to extend in the horizontal direction from the upstream end 62A to the downstream end 62B toward the vertical wall portion 64 between the hydraulic pump 98 and the muffler 97. The "lateral direction" in which the second partition 62 extends may be a direction parallel to the horizontal direction or may be a direction inclined relative to the horizontal direction. In the specific example shown in FIG. 4, the second partition 62 has a flat plate-like shape, but the shape of the second partition 62 is not limited to the specific example shown in FIG. 4. For example, the second partition 62 may have a curved shape or may have a shape including a flat plate-like portion and a curved portion.

[0056] [Fifth feature] In a work machine 1 having the fifth characteristic, an upper end 75A of the first exhaust port 75 is located above an upper end 30A of the engine 30, an upper end 61A of the first partition 61 is located above an upper end 30A of the engine 30, and a lower end 61B of the first partition 61 is located below an upper end 30A of the engine 30. When the first exhaust port 75 is formed at a position shifted upward relative to the engine 30 in the vertical direction as shown in Fig. 4, the first partition 61 is disposed at a position shifted upward relative to the engine 30 so as to be effectively interposed between the engine 30 and the first exhaust port 75. This makes it possible to effectively block a portion of the engine sound traveling from the engine 30 toward the first exhaust port 75.

[0057] [6th feature] In a work machine 1 having the sixth feature, the first exhaust port 75 is formed in the side wall 13A of the outer wall 13, and the first partition wall 61 is covered by the top wall 13B of the outer wall 13 located above the first partition wall 61. Because the first exhaust port 75 is formed in the side wall 13A of the outer wall 13, and the top wall 13B of the outer wall 13 covers the first partition wall 61 from above, it is possible to prevent foreign matter such as rainwater and dust from entering the machine room.

[0058] [7th feature] In a work machine 1 having the seventh characteristic, as shown in Fig. 3, the right and left rear parts of the outer wall 13 have a curved shape when viewed from above, and the first exhaust port 75 is formed in the right rear part. In this case, at least a portion of the first exhaust port 75 is formed in the curved right rear part, making it easier to ensure the opening area of ​​the first exhaust port 75. In the specific example shown in Fig. 3, a portion of the first exhaust port 75 is formed in the right rear part, and the other portion of the first exhaust port 75 is formed in the right side part (the right side of the upper rotating body 3) extending in the front-rear direction.

[0059] [8th feature] 2 and 4, in a work machine 1 having the eighth characteristic, the outer wall 13 further has a third exhaust port 77 that exhausts air from the engine compartment 82 of the machinery compartment 80 to the outside of the machinery compartment 80. The third exhaust port 77 is formed in the top wall 13B of the outer wall 13. In this case, it becomes easier to ensure the opening area of ​​the outlet through which the air in the machinery compartment 80 is exhausted to the outside of the machinery compartment 80.

[0060] [9th feature] The work machine 1 having the ninth feature further includes a third partition 63 disposed below the third exhaust port 77 and above the engine 30, and the third partition 63 has an upper surface 63A that overlaps with the third exhaust port 77 when viewed from above. In this case, it is possible to prevent foreign matter such as rainwater, dust, etc. from entering the engine chamber 82 of the machinery room 80 through the third exhaust port 77. It is more preferable that the upper surface 63A of the third partition 63 has a size (area) such that it overlaps with the entire third exhaust port 77 when viewed from above. In this case, it is possible to more effectively prevent foreign matter such as rainwater, dust, etc. from entering the engine chamber 82 of the machinery room 80 through the third exhaust port 77.

[0061] The third partition 63 may have a portion that is approximately L-shaped in rear view, as shown in Fig. 4. In this case, as shown by the dashed-dotted arrow in Fig. 4, the airflow AF that has flowed into the engine compartment 82 flows in an approximately Z-shape (or S-shape) until it reaches the third exhaust port 77 and is exhausted from the third exhaust port 77 to the outside of the machinery compartment 80. This effectively reduces noise caused by the engine sound leaking to the outside from the third exhaust port 77.

[0062] [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.

[0063] (A) Exhaust vent In the embodiment, the outer wall 13 has not only the first exhaust port 75 but also the second exhaust port 76 and the third exhaust port 77, but one or both of the second exhaust port 76 and the third exhaust port 77 can be omitted.

[0064] (B) Regarding the second and third bulkheads In the embodiment, the work machine 1 is provided with not only the first partition 61 but also the second partition 62 and the third partition 63, but one or both of the second partition 62 and the third partition 63 may be omitted. [Explanation of symbols]

[0065] 1: Work machine 3: Upper rotating body 13: Exterior wall 13A: Side wall 13B: Ceiling wall 30: Engine 30A: Top of engine 61: 1st bulkhead 61A: Top of the first bulkhead 61B: Lower end of first bulkhead 61C: Side end of first bulkhead 62:Second bulkhead 62A: upstream end of second bulkhead 62B: downstream end of second bulkhead 63: Third bulkhead 63A: Top surface of third bulkhead 64:Vertical wall part 65: Side wall 65A: Upper guide surface of side wall 65B: Lower guide surface of side wall 75: First exhaust port 75A: Top of the first exhaust port 75B: Lower end of first exhaust port 76: Second exhaust port 76B: Lower end of second exhaust port 77: 3rd exhaust port 80: Machine room 81: Air intake chamber 82: Engine room 97: Muffler 98: Hydraulic pump AF: Air flow

Claims

1. An outer wall surrounding the machine room; an engine disposed in the engine room; A first partition wall is disposed in the machine room, the outer wall has an exhaust port for discharging air from the machine room to the outside of the machine room, The first partition has a vertical wall portion interposed between the engine and the exhaust port and extending upward, and a horizontal wall portion extending laterally from an upper portion of the vertical wall portion toward the exhaust port.

2. the exhaust port is a first exhaust port, The outer wall further has a second exhaust port for exhausting air from the machine room to the outside of the machine room, the second exhaust port being formed below the first exhaust port, 2. The work machine according to claim 1, wherein the lateral wall portion has an upper guide surface that is an upper surface that guides the air in the machine room to the first exhaust port, and a lower guide surface that is a lower surface that guides the air in the machine room to the second exhaust port.

3. a hydraulic pump driven by the engine; a muffler disposed on the hydraulic pump to reduce exhaust noise of the engine; The work machine according to claim 1 or 2, further comprising a second partition interposed between the hydraulic pump and the muffler.

4. The work machine according to claim 3 , wherein the second partition is disposed between the hydraulic pump and the muffler, extending from a position adjacent to the engine toward the lower portion of the vertical wall portion.

5. an upper end of the exhaust port is located above an upper end of the engine; an upper end of the first bulkhead is located above an upper end of the engine, The work machine according to claim 1 , wherein a lower end of the first bulkhead is located below an upper end of the engine.

6. The exhaust port is formed in a side wall of the outer wall, The work machine according to claim 1 , wherein the first partition is covered by a top wall of the outer wall located above the first partition.

7. The right rear and left rear portions of the outer wall have a curved shape when viewed from above, The work machine according to claim 1 , wherein the exhaust port is formed in the right rear portion or the left rear portion.

8. the exhaust port is a first exhaust port, 2. The work machine according to claim 1, wherein the outer wall further has a third exhaust port for discharging air from the machine room to the outside of the machine room, the third exhaust port being formed in a top wall of the outer wall.

9. a third partition wall disposed below the third exhaust port, The work machine according to claim 8 , wherein the third partition has an upper surface that overlaps with the third exhaust port when viewed from above.

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