Work equipment

Abstract

To provide a work machine which facilitates maintenance.SOLUTION: A work machine includes: a machine body; a support base mounted on the machine body; and a tank which is movably supported on the support base in a horizontal direction between an installation position and a drawing position drawn from the installation position.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a work machine such as a backhoe. [Background technology]

[0002] 2. Description of the Related Art A working machine disclosed in Patent Document 1 is known in the art. The work machine disclosed in Patent Document 1 includes a support platform mounted on a machine body, and a fuel tank supported by the support platform. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-2720 A Summary of the Invention [Problem to be solved by the invention]

[0004] Because the fuel tank is fixed to the aircraft, it can be difficult to perform maintenance on the fuel tank or on devices located near the fuel tank. An object of the present invention is to provide a work machine that allows easy maintenance. [Means for solving the problem]

[0005] A working machine according to one aspect of the present invention includes a machine body, a support base mounted on the machine body, and a horizontally extending portion extending from the support base to a set position and a pull-out position. Direction of movement a tank movably supported on the A stay member provided on the tank so as to be movable integrally with the tank, and a fixing portion provided on the aircraft body to which the stay member is fixed; Equipped with The support base has a mounting portion on which a lower mounting surface provided on the bottom of the tank is placed to support the tank so that the tank can be moved in the movement direction, and the stay member is provided on the upper part of the tank and is fixed to the fixing portion when the tank is in the pulled-out position. Effect of the Invention

[0006] According to the above-described working machine, maintenance of the tank or a device disposed in the vicinity of the tank can be easily performed by pulling the tank out from its installed position, thereby improving maintainability. [Brief description of the drawings]

[0007] [Figure 1] 1 is a schematic side view showing an overall configuration of a working machine. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. 4 is a perspective view showing a fuel tank arrangement portion of the revolving frame. [Figure 6] FIG. [Figure 7] FIG. 2 is a front view of the fuel tank in an installed position. [Figure 8] FIG. 4 is a rear view of the fuel tank in the installed position. [Figure 9] FIG. 4 is a right side view showing the fuel tank in an installed position. [Figure 10] FIG. 2 is a front view of the fuel tank in the extended position. [Figure 11] FIG. 4 is a perspective view of a member supporting the support base and the fuel tank. [Figure 12] FIG. [Figure 13] FIG. [Figure 14] FIG. [Figure 15] FIG. [Figure 16] FIG. [Figure 17] FIG. 13 is a front view showing a second fixing device. [Figure 18] FIG. 13 is an exploded perspective view showing a third fixing device and a fourth fixing device. [Figure 19] FIG. 4 is a right side view showing the support structure for the upper part of the fuel tank. [Figure 20] FIG. [Figure 21] 4 is a schematic cross-sectional view of the rear side showing the intake structure of cooling air. FIG. [Figure 22] FIG. 4 is a perspective view showing a state in which the opening / closing duct is open. [Figure 23] FIG. 4 is a perspective view showing the inside of the opening and closing duct. [Figure 24A] FIG. [Figure 24B] 4 is a perspective view showing the relationship between a main body of a partition member and a sealing material. FIG. [Diagram 25] FIG. [Figure 26] FIG. 4 is a perspective view showing the inside of the partition member. [Figure 27] FIG. 4 is a perspective view showing the outer side of the partition member. [Figure 28] 3 is a plan cross-sectional view of an arrangement portion for a radiator, etc., and an opening / closing duct. FIG. [Figure 29] 4 is a rear cross-sectional view of an arrangement portion for a radiator, etc., and an opening / closing duct. FIG. [Diagram 30] FIG. [Diagram 31] 1 is a perspective view of the outer lower part of the frame body portion. FIG. [Diagram 32] FIG. [Diagram 33] FIG. [Diagram 34] FIG. 2 is a perspective view of a fan shroud, a radiator, and a fixed duct. [Diagram 35] FIG. 2 is a perspective view of the mounting frame and the fixed duct. [Diagram 36] FIG. [Figure 37] FIG. 4 is a perspective view showing a sealing portion between a fixed duct and an outer wall portion. [Figure 38] FIG. 4 is a plan sectional view of a portion where the bracket member is located. [Figure 39] FIG. 4 is a perspective view showing a sealing structure between an opening / closing duct and a fixed duct. [Diagram 40] FIG. 4 is a perspective view showing a sealing structure between an opening / closing duct and a fixed duct. [Diagram 41] FIG. 2 is a plan view showing the arrangement of equipment in the engine room. [Diagram 42] FIG. 2 is a perspective view showing an air cleaner and an inlet passage. [Diagram 43] FIG. 2 is an exploded perspective view of the air cleaner and the inlet passage. [Diagram 44] FIG. 2 is a plan cross-sectional view of an inlet passage. [Diagram 45] FIG. 4 is a plan cross-sectional view of an air introduction portion of an inlet passage. [Figure 46] FIG. [Figure 47] FIG. 4 is a side cross-sectional view of the air introduction portion of the inlet passage. [Figure 48] FIG. [Figure 49] FIG. [Figure 50] FIG. 4 is a perspective view of the intake structure as seen from inside the engine compartment. [Figure 51] FIG. [Figure 52] FIG. [Figure 53] FIG. [Figure 54] FIG. [Figure 55] FIG. 4 is a rear cross-sectional view of the straightening plate device. [Figure 56] FIG. 4 is a plan view of the straightening plate device with some components omitted. [Figure 57] FIG. 2 is a perspective view of a first component. [Figure 58] FIG. 2 is a perspective view of a first component. [Figure 59] FIG. 4 is a perspective view of a second structure. [Figure 60] FIG. 4 is a perspective view of a second structure. [Figure 61] FIG. 4 is a perspective view of a second structure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a schematic side view showing the overall configuration of a working machine 1 according to this embodiment. Fig. 2 is a schematic plan view of the working machine 1. In this embodiment, a backhoe, which is a rotating working machine, is exemplified as the working machine 1. As shown in Fig. 1, the work machine 1 includes a machine body (swivel base) 2, a traveling device 3, and a work device 4. The machine body 2 is equipped with a driver's seat 6 and a canopy 5 as a sunshade for an operator (driver) sitting in the driver's seat 6. The canopy 5 may function as a driver protection device that protects the operator. In addition, while the work machine 1 in this embodiment is exemplified as a canopy-equipped work machine, it may also be a cabin-equipped work machine in which a cabin surrounding the driver's seat 6 is mounted on the machine body 2 instead of the canopy 5.

[0009] In this embodiment, the direction toward the front of the operator seated in the driver's seat 6 of the work machine 1 (the direction of the arrow A1 in FIGS. 1 and 2) is the forward direction (the front of the machine body), and the opposite direction (the direction of the arrow A2 in FIGS. 1 and 2) is the forward direction (the front of the machine body). The direction toward the left of the operator (the rear of the aircraft) is referred to as the rear (the rear of the aircraft), and the direction of arrow K1 in Figures 1 and 2 is referred to as the fore-aft direction. Additionally, the direction toward the left side of the operator (the far side of Figure 1, the direction of arrow B1 in Figure 2) is referred to as the leftward direction, and the direction toward the right side of the operator (the near side of Figure 1, the direction of arrow B2 in Figure 2) is referred to as the rightward direction.

[0010] Additionally, the horizontal direction perpendicular to the front-to-rear direction (aircraft front-to-rear direction) K1 will be described as the aircraft width direction K2 (see FIG. 2). The direction from the center of the aircraft 2 in the width direction toward the right or left will be described as the aircraft width direction outward. In other words, the aircraft width direction outward is the direction away from the center of the aircraft 2 in the width direction in the aircraft width direction K2. The direction opposite to the aircraft width direction outward will be described as the aircraft width direction inward. In other words, the aircraft width direction inward is the direction approaching the center of the aircraft 2 in the width direction K2.

[0011] As shown in Figs. 1 and 2, the traveling device 3 is a crawler type traveling device that supports the machine body 2 so that it can travel, and includes a traveling frame 3A, a first traveling device 3L provided on the left side of the traveling frame 3A, and a second traveling device 3R provided on the right side of the traveling frame 3A. The first traveling device 3L and the second traveling device 3R are driven by a traveling motor M1 configured by a hydraulic motor (hydraulic actuator). In this embodiment, a crawler type traveling device 3 is used, but this is not limited to this, and a wheel type traveling device or the like may be used. A dozer device 7 is attached to the front of the traveling device 3.

[0012] As shown in FIG. 1, the machine body 2 is supported on a traveling device 3 via a swivel bearing 8 so as to be rotatable about a swivel axis X1 which is an axis extending in the vertical direction. As shown in Fig. 1, the machine body 2 has, at its front, a support bracket 9 and a swing bracket 10 that support the working device 4. The support bracket 9 is provided so as to protrude forward from the machine body 2. The swing bracket 10 is attached to the front of the support bracket 9 so as to be swingable around a vertical axis (an axis extending in the up-down direction).

[0013] As shown in FIG. 1, the working device 4 has a boom 11, an arm 12, and a bucket 13. The base of the boom 11 is pivotally attached to the upper part of the swing bracket 10 so as to be rotatable about a horizontal axis (an axis extending in the machine body width direction K2). The arm 12 is pivotally attached to the tip side of the boom 11 so as to be rotatable about the horizontal axis. The bucket 13 is provided at the tip side of the arm 12 so as to be capable of scooping and dumping operations. The scooping operation is an operation of swinging the bucket 13 in a direction approaching the boom 11, for example, an operation for scooping up soil and sand. The dumping operation is an operation of swinging the bucket 13 in a direction away from the boom 11, for example, an operation for dropping (discharging) the scooped up soil and sand.

[0014] The work machine 1 can be equipped with other working tools (hydraulic attachments) that can be driven by a hydraulic actuator, instead of or in addition to the bucket 13. Examples of other working tools include a hydraulic breaker, a hydraulic crusher, an angle broom, an earth auger, a pallet fork, a sweeper, a mower, and a snow blower. The swing bracket 10 is capable of swinging by the extension and retraction of a swing cylinder C1. The boom 11 is capable of swinging by the extension and retraction of a boom cylinder C2. The arm 12 is capable of swinging by the extension and retraction of an arm cylinder C3. The bucket 13 is capable of scooping and dumping by the extension and retraction of a bucket cylinder C4. The swing cylinder C1, boom cylinder C2, arm cylinder C3, and bucket cylinder C4 are configured by hydraulic cylinders (hydraulic actuators).

[0015] Next, with reference to FIG. 2 etc., the layout and configuration of the main devices mounted on the work machine 1 will be roughly described. As shown in FIG. 2, a prime mover E1 is mounted on the rear of the aircraft body 2. The prime mover E1 is a diesel engine. The prime mover E1 may be a gasoline engine or an electric motor, or may be a hybrid type having an engine and an electric motor. A cooling fan 14 is attached to the right of the prime mover E1. The cooling fan 14 is driven by the prime mover E1 and generates cooling air that flows from right to left, that is, from the outside of the aircraft body 2 toward the prime mover E1. More specifically, the cooling fan 14 is a suction type fan that draws in air (outside air) from the right side of the aircraft body 2 and flows it toward the prime mover E1 side.

[0016] To the right of the cooling fan 14, a radiator 15, an oil cooler 16, and a fuel cooler 17 are arranged. The radiator 15 is a cooler that cools the coolant that cools the prime mover E1. The oil cooler 16 is a cooler that cools the return hydraulic oil from hydraulic actuators such as hydraulic cylinders and hydraulic motors. The fuel cooler 17 is a cooler that cools the fuel. These coolers are cooled by the cooling air sucked in by the cooling fan 14.

[0017] A fuel tank (tank) 19 is disposed in front of the radiator 15. The fuel tank 19 is a tank that stores fuel for the prime mover E1. A swing motor 20 is disposed below the left part of the fuel tank 19 (see FIG. 5). The swing motor 20 is configured by a hydraulic motor (hydraulic actuator). The swing motor 20 is a motor that swings (rotates) the machine body 2 around the swing axis X1.

[0018] A battery 22 is disposed in front of the fuel tank 19. The battery 22 is a storage battery that supplies power to electrical components equipped on the work machine 1. A hydraulic pump 25 is attached to one side (left part) of the prime mover E1. The hydraulic pump 25 is driven by the power of the prime mover E1. This hydraulic pump 25 discharges hydraulic oil (pressurized oil) that drives hydraulic actuators such as hydraulic motors and hydraulic cylinders equipped in the work machine 1. The hydraulic pump 25 also discharges pilot pressure that operates hydraulic valves and hydraulic pressure for signals.

[0019] An exhaust gas purification device 26, an air cleaner 27, and a hydraulic oil tank 28 are disposed to the left of the prime mover E1. The exhaust gas purification device 26 is a device that purifies exhaust gas discharged from the prime mover E1, and is, for example, a DPF (Diesel particulate filter). The air cleaner 27 is a device that purifies air supplied to the prime mover E1. The hydraulic oil tank 28 is a tank that stores hydraulic oil. The exhaust gas purification device 26 and the air cleaner 27 are disposed above the hydraulic pump 25, and the air cleaner 27 is disposed to the left of the exhaust gas purification device 26. The hydraulic oil tank 28 is disposed below the driver's seat 6. Hydraulic oil is sent from the hydraulic oil tank 28 to the hydraulic pump 25.

[0020] A control valve V1 is disposed in front of the hydraulic oil tank 28. The control valve V1 controls the flow rate of hydraulic oil supplied from the hydraulic pump 25 to hydraulic actuators that are provided in the work machine 1 and driven by the hydraulic oil. More specifically, the control valve V1 is a valve unit that aggregates each control valve that controls the flow rate of hydraulic oil supplied to each hydraulic actuator provided in the work machine 1.

[0021] The hydraulic oil tank 28 and the control valve V1 are disposed on the same side as the hydraulic pump 25 in the aircraft body 2. By disposing the hydraulic pump 25, the hydraulic oil tank 28, and the control valve V1 on one side (the left side) of the aircraft body 2, it is possible to simplify the routing of hydraulic hoses routed between the hydraulic pump 25, the hydraulic oil tank 28, and the control valve V1, etc.

[0022] As shown in FIG. 3, the machine body 2 has a revolving frame 30 which serves as a skeleton. The revolving frame 30 has a revolving base plate (base plate) 31 which constitutes the bottom of the machine body 2, reinforcing ribs 32 which reinforce the revolving base plate 31, the support bracket 9 described above, and a weight 33. The revolving frame 30 also has brackets, stays, etc. for mounting the equipment, tanks, and other parts mounted on the machine body 2. The revolving base plate 31 is formed of a thick steel plate or the like. The brackets, stays, etc. mounted on the revolving frame 30 are fixed on the revolving base plate 31 by welding. The revolving base plate 31 is supported on the traveling device 3 via a revolving bearing 8 so as to be rotatable about the revolving axis X1.

[0023] The reinforcing rib 32 is provided on the swivel base plate 31 from the front to the rear. The reinforcing rib 32 is formed of a plate material, and is provided upright on the swivel base plate 31 in a vertical direction (with the plate thickness direction aligned with the horizontal direction) and fixed to the swivel base plate 31 by welding. In detail, the reinforcing rib 32 includes a first vertical rib 32R provided on one side (right side) of the swivel base plate 31 in the machine body width direction K2 and extending from the front to the rear of the swivel base plate 31, and a second vertical rib 32L provided on the other side (left side) of the swivel base plate 31 in the machine body width direction K2 and extending from the front to the rear of the swivel base plate 31.

[0024] The support bracket 9 is made up of a pair of upper and lower plates and is fixed to the front part of the reinforcing rib 32. Specifically, the support bracket 9 has an upper plate 9A fixed to the upper end of the reinforcing rib 32 and a lower plate 9B fixed to the front lower part of the reinforcing rib 32. The upper plate 9A has a main portion 9Aa provided between the front parts of the upper ends of the first vertical rib 32R and the second vertical rib 32L, a first extension portion 9Ab extending rearward from the main portion 9Aa above the upper end of the first vertical rib 32R, and a second extension portion 9Ac extending rearward from the main portion 9Aa above the upper end of the second vertical rib 32L. The lower plate 9B has an upper wall 9Ba disposed below the front part of the main portion 9Aa and a vertical wall 9Bb extending downward from the rear end of the upper wall 9Ba. A tube boss 122 is fixed between the front part of the main portion 9Aa and the front part of the upper wall 9Ba. The swing bracket 10 is supported by the tube boss 122 so as to be swingable via a vertical shaft.

[0025] The weight 33 is attached to the rear of the swivel base plate 31. The weight 33 constitutes the rear of the fuselage 2. A partition plate 34 is fixed to a midway portion in the front-rear direction K1 of the rotating base plate 31. The partition plate 34 is oriented vertically and extends in the width direction K2 of the aircraft body, and crosses the first vertical rib 32R and the second vertical rib 32L. The prime mover E1 is mounted between the partition plate 34 of the rotating base plate 31 and the weight 33.

[0026] As shown in FIG. 3, a bracket member 123 supporting the rear end side of the swing cylinder C1 is disposed in front of the right part of the partition plate 34 and to the right of the first vertical rib 32R. The bracket member 123 includes a lower bracket 123A and an upper bracket 123B. The lower bracket 123A is placed and fixed on the swivel base plate 31, and its rear end is fixed to the front surface of the partition plate 34 and its left end is fixed to the right surface of the first vertical rib 32R. The upper bracket 123B is disposed above the lower bracket 123A, and its rear end is fixed to the front surface of the partition plate 34 and its left end is fixed to the right surface of the first vertical rib 32R. A pin 124 for pivotally supporting the rear end side of the swing cylinder C1 is provided on the right part of the bracket member 123 across the upper bracket 123B and the lower bracket 123A.

[0027] 4, the machine body 2 has a cover device 143 that covers devices, parts, members, etc. mounted on the revolving frame 30. The cover device 143 is configured to have a plurality of covers. The plurality of covers include a first cover 143A to a tenth cover 143J. The first cover 143A is disposed at the front right part of the fuselage 2 and covers the front of the battery 22 etc. The first cover 143A is removable, and by removing it, inspection and maintenance of the battery 22 etc. can be performed.

[0028] The second cover 143B is disposed so as to extend rearward and upward from an upper portion of the first cover 143A, and covers the fuel tank 19 and the battery 22 from above. The rear portion of the second cover 143B is supported by a hinge so as to be rotatable about an axis extending in the fuselage width direction K2, and the second cover 143B is adapted to open upward. By opening the second cover 143B, the fuel tank 19 can be refueled and the fuel tank 19 and the battery 22 can be inspected and maintained.

[0029] The third cover 143C covers the right side of the fuel tank 19, the battery 22, etc. The rear part of the third cover 143C is pivotally supported by a hinge around an axis extending in the vertical direction and opens rearward, and the fuel tank 19 and the battery 22 can be inspected and maintained by opening the third cover 143C. Moreover, by opening the second cover 143B and the third cover 143C, the upper and sides of the fuel tank 19 are opened. Note that the third cover 143C is not limited to being pivotally supported by a hinge, and may be configured to be detachably attached by, for example, a bolt.

[0030] The fourth cover 143D covers the radiator 15, the oil cooler 16, the fuel cooler 17, etc. More specifically, the fourth cover 143D includes an upper wall portion 143D1 that covers the upper parts of the radiator 15, the oil cooler 16, the fuel cooler 17, etc., and an outer wall portion 143 (side wall portion) D2 that covers the right side to the rear of the radiator 15, the oil cooler 16, the fuel cooler 17, etc. The front portion of the fourth cover 143D is pivotally supported by a hinge so as to be rotatable about an axis extending in the vertical direction, and opens forward. By opening the fourth cover 143D, inspection and maintenance of the radiator 15, the oil cooler 16, the fuel cooler 17, etc. can be performed. The upper wall portion 143D1 has an outside air introduction portion 125 for taking in outside air into the fourth cover 143D by the suction of the cooling fan 14. is doing.

[0031] The fifth cover 143E covers the right part of the prime mover E1 and the upper part of the cooling fan 14 etc. The fifth cover 143E has an exhaust part 126 that exhausts hot air above the prime mover E1 to the outside of the cover device 143. The sixth cover 143F and the seventh cover 143G cover the rear of the prime mover E1. The sixth cover 143F has an opening 127 that is opened and closed by the seventh cover 143G. The right part of the seventh cover 143G is pivotally supported by a hinge around an axis extending in the vertical direction, and opens to the right. An air intake 128 for taking in air to be sucked into the air cleaner 27 is provided on the left side of the seventh cover 143G in the sixth cover 143F.

[0032] The eighth cover 143H covers the upper part of the hydraulic oil tank 28 and the left side of the air cleaner 27. The eighth cover 143H has a rear part pivotally supported by a hinge around an axis extending in the vertical direction and opens rearward. By opening the eighth cover 143H, the hydraulic oil tank 28, the air cleaner 27, and the hydraulic pump 25 can be inspected and maintained. The ninth cover 143I is disposed below the ninth cover 143I and covers the lower part of the hydraulic oil tank 28.

[0033] The tenth cover 143J covers the upper side of the prime mover E1. As shown in FIG. 5, the swivel motor 20 is disposed in front of the partition plate 34 and between the first vertical rib 32R and the second vertical rib 32L, closer to the first vertical rib 32R. The swivel motor 20 is mounted on the swivel base plate 31. A swivel pinion (not shown) is mounted on the lower part of the swivel motor 20, which is driven around the vertical axis by the power of the swivel motor 20. The swivel pinion meshes with an internal gear provided on the swivel bearing 8. The swivel bearing 8 has an outer ring mounted on the machine body 2 and an inner ring provided on the inner periphery of the outer ring so as to be rotatable around the swivel axis X1. An internal gear is formed on the inner periphery of the inner ring. Therefore, the swivel pinion is driven to rotate by the swivel motor 20 and moves along the internal gear, so that the machine body 2 swivels around the swivel axis X1.

[0034] The fuel tank 19 is disposed above the first vertical rib 32R (reinforcement rib 32) and disposed so as to extend from the right end side (right side of the first vertical rib 32R) of the body 2 across the upper part of the first vertical rib 32R in the body width direction K2 to the upper side of the swing motor 20. The fuel tank 19 is disposed near the swing motor 20. More specifically, it is disposed on the right side of the swing motor 20.

[0035] 5 and 6, the fuel tank 19 is supported by a support base 52 mounted on the rotating frame 30 (aircraft body 2). A fuel supply pump 73 is disposed below the support base 52. The fuel supply pump 73 is attached to the support base 52. 5, a suction hose 129 for sending fuel from a fuel storage container in which fuel is stored to the fuel supply pump 73 is wound and held on the upper part of the fuel tank 19. A fuel supply pipe 131 to which a delivery hose 130 for sending fuel discharged from the fuel supply pump 73 to the fuel tank 19 is connected is provided on the upper part of the fuel tank 19.

[0036] As shown in Figures 7, 8 and 9, the fuel tank 19 has a tank body 19A arranged to the right of the swing motor 20, a protruding portion 19B extending leftward from the tank body 19A and protruding above the swing motor 20, and a protruding portion 19C protruding downward from a bottom portion 19Aa of the tank body 19A. The protruding portion 19C is formed in the approximate center of the tank body 19A in the front-rear direction K1 so as to extend in the aircraft width direction K2. Ta2 0 is placed.

[0037] In the fuel tank 19 of this embodiment, the capacity of the fuel tank 19 can be increased by providing the overhanging portion 19B and the protruding portion 19C. Furthermore, by providing the protruding portion 19C, the water in the fuel can be separated. As shown in FIG. 6, a drain tube 132 for draining the water in the fuel tank 19 is connected to the bottom of the protruding portion 19C. A supply tube 133 for sending the fuel in the fuel tank 19 to the prime mover E1 is connected to the right side surface of the protruding portion 19C. The supply tube 133 is connected to the right side surface of the protruding portion 19C. By providing a fuel delivery section that has a plug, even if the fuel delivery section becomes clogged, it can be easily cleaned.

[0038] The bottom surface of the tank body 19A, that is, the front and rear surfaces of the protruding portion 19C, are made into a lower mounting surface 48 on which mounting portions 55c1, 55c2, which will be described later, are placed. 7, 8, and 10, the fuel tank 19 is supported on the support base 52 so as to be movable in the horizontal direction (movement direction Y3) between an installation position S1 and a withdrawal position S2 withdrawn from the installation position S1. The installation position S1 is a position shown in FIGS. 7 and 8, and is a position where the fuel tank 19 is housed in the cover device 143. The withdrawal position S2 is a position shown in FIG. 10, and is a position where the fuel tank 19 (projection portion 19B) can be retracted from above the swing motor 20. In this embodiment, the fuel tank 19 can be withdrawn outward (to the right) from the installation position S1 in the aircraft width direction K2.

[0039] By drawing out the fuel tank 19 from the installation position S1 to the drawing-out position S2 and retracting the overhanging portion 19B from above the swing motor 20, the swing motor 20 can be accessed and maintenance of the swing motor 20 can be performed. In addition, by retracting the overhanging portion 19B from above the swing motor 20, the swing motor 20 can be removed to the upper side. In addition, by moving the fuel tank 19 and retracting the overhanging portion 19B from above the swing motor 20, maintenance and removal of the swing motor 20 can be ensured, so that the capacity can be increased by providing the overhanging portion 19B that overhangs above the swing motor 20 on the fuel tank 19, and the space above the swing motor 20 can be effectively used. In addition, by drawing out the fuel tank 19 from the installation position S1 to the drawing-out position S2, maintenance of the fuel tank 19 can be easily performed and maintainability can be improved.

[0040] Next, the structure of the support base 52 will be described. 11, 12 and 13, the support base 52 has a first side plate 53, a second side plate 54, and an upper plate 55. The first side plate 53, the second side plate 54, and the upper plate 55 are formed from plate materials and are fixed to each other at appropriate locations by welding or the like.

[0041] As shown in Fig. 12 and Fig. 13, the first side plate 53 has a vertical wall 53A long in the front-rear direction K1 arranged so that the plate surface faces the fuselage width direction K2, and a mounting wall 53B extending leftward from the lower end of the vertical wall 53A. The first side plate 53 also has a front upper edge 53a which is the upper end of the front part of the vertical wall 53A, a vertical edge 53b extending downward from the rear end of the front upper edge 53a, and a rear upper edge 53c extending rearward from the lower end of the vertical edge 53b. The front part of the mounting wall 53B is fixed by a bolt to a boss member 134 fixed to the first extension portion 9Ab. The rear part of the mounting wall 53B is fixed by a bolt to a mounting member 135 fixed to the left part of the upper bracket 123B.

[0042] 12, 13, and 14, the second side plate 54 has a vertically long vertical wall 54A arranged so that the plate surface faces the fuselage width direction K2, an extension wall 54B extending rearward from the upper part of the vertical wall 54A, a first mounting wall 54C extending rightward from the upper end of the rear part of the extension wall 54B, and a second mounting wall 54D extending rightward from the lower end of the vertical wall 54A. The second side plate 54 also has a front upper edge 54a which is the upper end of the vertical wall 54A, a vertical edge 54b extending downward from the rear end of the front upper edge 54a, a rear upper edge 54g extending rearward from the lower end of the vertical edge 54d, and a recessed edge 54e recessed downwardly provided between the rear upper edge 54g and the first mounting wall 54C.

[0043] As shown in Figures 13 and 14, the recessed edge portion 54e is configured to have a first edge portion 54e1 extending downward from the rear end of the rear upper edge 54g, a second edge portion 54e2 extending downward from the front end and left end of the first mounting wall 54C, and a third edge portion 54e3 connecting the lower ends of the first edge portion 54e1 and the second edge portion 54e2. The first mounting wall 54C is placed on the front part of the upper surface of the support plate 137 and attached by bolts. The support plate 137 is fixed to the upper end of a vertical plate 136 erected on the right part of the upper bracket 123B.

[0044] As shown in FIG. 12, the upper plate 55 is fixed across the first side plate 53 and the second side plate 54 . As shown in FIGS. 12 and 13, the upper plate 55 includes a battery mounting wall 55a and a hanging wall 55b. 55b, a pair of front and rear placement portions 55c1, 55c2, and a connecting wall 55d. The battery mounting wall 55a is provided across the front upper edges 53a, 54a of the first side plate 53 and the second side plate 54. The battery 22 is placed and attached on the battery mounting wall 55a (see FIG. 5).

[0045] The hanging wall 55b extends downward from the rear edge of the battery mounting wall 55a and is provided between the vertical edges 53b, 54b of the first side plate 53 and the second side plate 54. One (front) mounting portion 55c1 of the pair of mounting portions 55c1, 55c2 extends rearward from the lower edge of the hanging wall 55b and is provided across the front portion of the rear upper edge 53c of the first side plate 53 and the rear upper edge 54g of the second side plate 54. One mounting portion 55c1 protrudes rightward from the rear upper edge 53c of the first side plate 53. The other (rear) mounting portion 55c2 is disposed at a distance rearward from one mounting portion 55c1 and is provided across the rear portion of the rear upper edge 53c of the first side plate 53 and the upper surface of the first mounting wall 54C of the second side plate 54. As shown in FIG. 13, a first support piece 155a, a second support piece 155b, and a third support piece 155c are formed at a distance from the right at the rear of the other mounting portion 55c2. The first support piece 155a is placed on the upper surface of the first mounting wall 54C, and is fixed to the support plate 137 together with the first mounting wall 54C by bolts.

[0046] As shown in FIG. 9 and FIG. 14, the fuel tank 19 is placed on the pair of placement parts 55c1, 55c2 so as to be movable (slidable) in the aircraft width direction K2. More specifically, the front placement lower surface 48a is placed on the placement part 55c1, and the rear placement lower surface 48a is placed on the placement part 55c1. That is, the support base 52 has a pair of placement parts 55c1, 55c2 that slidably support the fuel tank 19 in the moving direction Y3, which is the direction in which the fuel tank 19 is moved, and the pair of placement parts 55c1, 55c2 are arranged side by side with an interval in the horizontal direction perpendicular to the moving direction Y3. In this embodiment, the placement lower surface 48 is placed on the placement parts 55c1, 55c2 via a base member 59 provided on the upper surface of the placement parts 55c1, 55c2. The base member 59 is formed of, for example, a member with low friction resistance or a member with cushioning properties. The underlay member 59 may be made of a material that has low friction resistance and cushioning properties.

[0047] As shown in FIGS. 9 and 14, the protruding portion 19C protrudes between the pair of mounting portions 55c1, 55c2, and is located within the recessed edge portion 54e. 12 and 13, the connecting wall 55d connects the left ends of the pair of mounting portions 55c to each other. The protruding portion 19C is disposed to the right of the connecting wall 55d. The connecting wall 55d is supported by being placed on the rear upper edge 53c.

[0048] In this embodiment, the support base 52 is formed by combining a tank support base that supports the fuel tank 19 and a battery support base that supports the battery 22, but the tank support base and the battery support base may be formed as separate bodies. 6, the work machine 1 is equipped with a fixing device 141 capable of fixing the fuel tank 19 to an installation position S1 and a withdrawal position S2. The fixing device 141 includes a first fixing device 160, a second fixing device 170, a third fixing device 180A, and a fourth fixing device 180B.

[0049] First, the first fixing device 160 will be described. The first fixing device 160 is a device (fixing band device) that presses and fixes the fuel tank 19 to the support base 52 with a band 161 while the fuel tank 19 is in the installation position S1. As shown in Figures 7, 8 and 9, the first fixing device 160 includes a first fixing band device 160A and a second fixing band device 160B. The first fixing band device 160A fixes the pushing direction Y1 (direction from the pull-out position S2 toward the installation position S1) side (left side) of the fuel tank 19 when the fuel tank 19 is in the installation position S1. In this embodiment, the first fixing band device 160A fixes the base side of the protruding portion 19B. The second fixing band device 160B fixes the pulling direction Y2 (direction from the installation position S1 toward the pull-out position S2) side (right side) of the fuel tank 19 when the fuel tank 19 is in the installation position S1.

[0050] The first fixing band device 160A and the second fixing band device 160B include a hook member 162 and It has a fixing piece 163 , a band 161 , a band hook 164 , and a band fixing device 165 . 7, 8 and 9, the hook member 162 is formed of a rod material. The hook member 162 is disposed near the lower part of the fuel tank 19. As shown in Fig. 8, the hook member 162A of the first fixing band device 160A is fixed to a mounting plate 166 provided upright on the third support piece 155c of the other mounting portion 55c2, and the hook member 162B of the second fixing band device 160B is fixed to the first support piece 155a of the other mounting portion 55c2.

[0051] As shown in Fig. 11 and Fig. 12, the mounting plate 166 has a vertical plate portion 166a rising from the third support piece 155c, and a horizontal plate portion 166b extending leftward from the upper portion of the vertical plate portion 166a. The hook member 162A has a hook portion 162Aa arranged above the horizontal plate portion 166b with a gap therebetween and extending in the machine body width direction K2, and a pair of legs 162Ab extending downward from the left and right ends of the hook portion 162Aa and fixed to the horizontal plate portion 166b. The hook member 162B has a hook portion 162Ba arranged above the first support piece 155a with a gap therebetween and extending in the machine body width direction K2, and a pair of legs 162Bb extending downward from the left and right ends of the hook portion 162Ba, then extending forward and fixed to the first support piece 155a.

[0052] 9, the fixed piece 163 is disposed on the opposite side to the hook member 162 so that the fuel tank 19 is sandwiched between the fixed piece 163 and the hook member 162. The fixed piece 163 is fixed to a support member 183 that is erected on the battery mounting wall 55a. As shown in FIG. 11 and FIG. 12, the support member 183 includes a first support member 183A disposed at the left and rear of the battery mounting wall 55a, and a second support member 183B disposed at the right and rear of the battery mounting wall 55a. A mounting plate 183Aa is fixed to the lower end of the first support member 183A, and the mounting plate 183Aa is fixed to a mounting block 167 fixed to the battery mounting wall 55a by a bolt. The lower end of the second support member 183B is fixed to the battery mounting wall 55a. The fixing piece 163A of the first fixing band device 160A is fixed to the left protruding partway up and down on the left surface of the first support member 183A. The fixing piece 163B of the second fixing band device 160B is fixed to the right protruding partway up and down on the right surface of the second support member 183B.

[0053] 9, band 161 is disposed from hook member 162, through the upper surface of fuel tank 19, to fixed piece 163. A band groove into which band 161 fits is formed in the upper surface of fuel tank 19. 7, 8 and 9, the band hook 164 is provided on one end side of the band 161 in the longitudinal direction, and is hooked onto the hooking member 162. In detail, the band hook 164 is formed in a hook shape, and the band hook 164A of the first fixing band device 160A is hooked onto the hook portion 162Aa of the hooking member 162A, and the band hook 164B of the second fixing band device 160B is hooked onto the hook portion 162Ba of the hooking member 162B.

[0054] The band fixing device 165 is provided on the other end side of the band 161 in the longitudinal direction, and fixes the band 161 to the fixing piece 163 by tensioning the band 161. In detail, the band fixing device 165 of the first fixing band device 160A and the second fixing band device 160B has a bolt member 168, a fastening nut 169A, and a lock nut 169B. The bolt member 168 is fixed to the band by welding or the like at the upper part, and has a threaded portion 168a (a portion where a male thread is cut) at the lower part. The band fixing device 165 can tension the band 161 by inserting the threaded portion 168a into the fixing piece 163 from above, and disposing the fastening nut 169A below the fixing piece 163, and screwing it into the threaded portion 168a and tightening it. In addition, after the band 161 is tensioned, the fastening nut 169A can be prevented from loosening by screwing the lock nut 169B into the threaded portion 168a.

[0055] In the above-described first fixing device 160, the band 161 can be removed by removing the lock nut 169B and the fastening nut 169A from the bolt member 168. When the fuel tank 19 is moved from the installation position S1 to the pulled-out position S2, the band 161 of the first fixing device 160 (first fixing band device 160A, second fixing band device 160B) is removed.

[0056] Next, the second fixing device 170 will be described. The second fixing device 170 is a device that positions and fixes the fuel tank 19 at the installation position S1 and the pull-out position S2 by an engaging portion 171 provided on the support base 52 and a first engaged portion 172 and a second engaged portion 173 provided on the fuel tank 19. As shown in Figs. 15, 16 and 17, in the second fixing device of this embodiment, the engagement portion 171 provided on the support base 52 is configured by a roller. The engagement portion 171 is provided on each of the pair of mounting portions 55c1 and 55c2. More specifically, the engagement portion 171 is provided on the front end side of the mounting portion 55c1 and the front end side of the mounting portion 55c2. That is, the engagement portion 171 includes a front engagement portion 171A provided on the mounting portion 55c1 and a rear engagement portion 171B provided on the mounting portion 55c2.

[0057] As shown in FIG. 16, an L-shaped cutout 177A that is open rearward and rightward is formed on the front end side of the mounting portion 55c1. A plate member 175 is fixed to the front end side and the lower surface side of the mounting portion 55c1 so as to cover the cutout from below. The front engagement portion 171A is fitted to a support shaft 174A extending in the front-rear direction K1 so as to be rotatable around its axis. A rectangular block-shaped shaft attachment member 176A is fixed to the rear of the support shaft 174A and to the rear of the engagement portion 171A. By fixing the shaft attachment member 176A to the rear of the plate member 175 by pinning, as shown in FIG. 14, the support shaft 174A is disposed across the upper surfaces of the shaft attachment member 176A and the mounting portion 55c1, and the engagement portion 171A is rotatably disposed between the shaft attachment member 176A and the mounting portion 55c1 in a form that protrudes upward from the upper surface of the mounting portion 55c1.

[0058] As shown in FIG. 16, an L-shaped cutout 177B that is open forward and to the right is formed on the front end side of the mounting portion 55c2. The cutout 177B is covered from below by the first mounting wall 54C. The rear engaging portion 171B is fitted to a support shaft 174B extending in the front-rear direction K1 so as to be rotatable about its axis. A rectangular block-shaped shaft mounting member 176B is fixed to the front of the support shaft 174B and in front of the engaging portion 171B. By fixing the shaft mounting member 176B to the front of the first mounting wall 54C by pinning, as shown in FIG. 14, the support shaft 174B is disposed across the upper surfaces of the shaft mounting member 176B and the mounting portion 55c2, and the engaging portion 171B is rotatably disposed between the shaft mounting member 176B and the mounting portion 55c2 in a form that protrudes upward from the upper surface of the mounting portion 55c1.

[0059] 17, the first engaged portion 172 and the second engaged portion 173 provided on the fuel tank 19 are formed by recesses into which the engaging portions (rollers) 171 fit. The first engaged portion 172 and the second engaged portion 173 are provided on the fuel tank 19 so as to be spaced apart in the moving direction Y3 of the fuel tank 19. In particular, the first engaged portion 172 is provided on the right side of the tank main body 19A (fuel tank 19), and the second engaged portion 173 is provided on the left side of the tank main body 19A (fuel tank 19).

[0060] As shown in Fig. 7, the first engaged portion 172 engages (fits) with the engaging portion 171 when the fuel tank 19 is in the installed position S1, restricting movement of the fuel tank 19 in the pulling-out direction Y2 and the pushing-in direction Y1. Also, as shown in Fig. 10, the second engaged portion 173 engages (fits) with the engaging portion 171 when the fuel tank 19 is in the pulled-out position S2, restricting movement of the fuel tank 19 in the pulling-out direction Y2 and the pushing-in direction Y1.

[0061] As shown in FIG. 14, the first engaged portion 172 and the second engaged portion 173 are provided at the front and rear portions of the fuel tank 19 in correspondence with the pair of front and rear engaging portions 171. As shown in FIG. 17, the recesses constituting the first engaged portion 172 and the second engaged portion 173 are recessed upward and are formed in a triangular shape having an apex at the top when viewed from the side. The first engaged portion 172 has a first restricting surface 172A and a first guide surface 172B. The first restricting surface 172A abuts against the engaging portion 171 at the front side in the pulling-out direction Y2 when the fuel tank 19 is in the installed position S1, thereby restricting movement of the fuel tank 19 in the pushing-in direction Y1. The first restricting surface 172A is formed in an inclined shape that transitions in the pulling-out direction Y2 as it approaches downward. The first guide surface 172B abuts against the engaging portion 171 at the rear side in the pulling-out direction Y2 when the fuel tank 19 is in the installed position S1, thereby restricting movement of the fuel tank 19 in the pulling-out direction Y2. The first guide surface 172B is formed to be inclined in the pushing direction Y1 as it goes downward from the apex 172C of the recess. The first guide surface 172B is formed to be inclined at an angle that is gentler than the inclination angle of the first restriction surface 172A. The second engaged portion 173 has a second restricting surface 173A and a second guide surface 173B. The second restricting surface 173A abuts against the engaging portion 171 on the front side in the pushing-in direction Y1 when the fuel tank 19 is in the pulled-out position S2, and restricts the movement of the fuel tank 19 in the pulling-out direction Y2. The second restricting surface 173A is formed in an inclined shape that transitions toward the pushing-in direction Y1 as it moves downward. The second guide surface 173B abuts against the engaging portion 171 on the rear side in the pushing-in direction Y1 when the fuel tank 19 is in the pulled-out position S2, and restricts the movement of the fuel tank 19 in the pushing-in direction Y1. The second guide surface 173B is formed in an inclined shape that transitions toward the pulling-out direction Y2 as it moves downward from the top 173C of the recess. The second guide surface 173B is formed at an inclination angle that is gentler than the inclination angle of the second restricting surface 173A. The first restriction surface 172A and the second restriction surface 173A may be formed so as to extend in the vertical direction.

[0062] When fuel tank 19 is moved from installation position S1 to pull-out position S2, engaging portion 171 is guided by first guide surface 172B to smoothly disengage from first engaged portion 172 and is guided by second guide surface 173B to smoothly fit into second engaged portion 173, and engaging portion 171 abuts against second regulating surface 173A, thereby positioning and fixing fuel tank 19 at pull-out position S2.

[0063] When fuel tank 19 is moved from pull-out position S2 to installation position S1, engaging portion 171 is guided by second guide surface 173B to smoothly disengage from second engaged portion 173 and is guided by first guide surface 172B to smoothly fit into first engaged portion 172, and engaging portion 171 abuts against first regulating surface 172A, thereby positioning and fixing fuel tank 19 at installation position S1.

[0064] The engaging portion 171 may be formed of a bar material (round bar). The engaging portion 171 may be formed as a recess, and the first engaged portion 172 and the second engaged portion 173 may be formed as a protrusion that fits into the engaging portion 171. Next, the third fixing device 180A and the fourth fixing device 180B will be described together. As shown in Figures 7 and 10, the third fixing device 180A is a device that fixes the fuel tank 19 to an installation position S1 and an extraction position S2 on the rear side of the fuel tank 19, and includes a stay member 181 that is provided on the fuel tank 19 so as to be movable integrally with the fuel tank 19, a stay mounting portion (first fixing portion) 182Ba and a boss member (second fixing portion) 184 that are provided on the aircraft body 2 side and spaced apart in the movement direction Y3 of the fuel tank 19, and a fixing device 189 (first fixing device) that fixes the stay member 181 to the stay mounting portion 182Ba (first fixing portion) when the fuel tank 19 is in the installation position S1, and fixes the stay member 181 to the boss member 184 (second fixing portion) when the fuel tank 19 is in the extraction position S2.

[0065] The fourth fixing device 180B is a device that fixes the fuel tank 19 to an installation position S1 and an extraction position S2 on the front side of the fuel tank 19, and includes a stay member 181 that is provided on the fuel tank 19 so as to be able to move integrally with the fuel tank 19, a first support member (third fixing part) 183A and a second support member (fourth fixing part) 183B that are provided on the aircraft 2 side and spaced apart in the movement direction Y3 of the fuel tank 19, and fixing devices 192 (second fixing device 192A, third fixing device 192B) that fix the stay member 181 to the first support member (third fixing part) 183A and the second support member (fourth fixing part) 183B when the fuel tank 19 is in the installation position S1.

[0066] The second support member (fourth fixed portion) 183B is disposed on the side of the first support member (third fixed portion) 183A in the pull-out direction Y2 from the installation position S1 toward the pull-out position S2. As shown in FIG. 7, the fixing device 192 includes a second fixing device 192A that fixes the stay member 181 to the third fixing portion 183A when the fuel tank 19 is in the installation position S1, and a third fixing device 192B that fixes the stay member 181 to the fourth fixing portion 183B when the fuel tank 192 is in the installation position S1.

[0067] As shown in FIG. 10, the third fixture 192B is provided to fix the fuel tank 19 in the pulled-out position S2. In this state, the stay member 181 is fixed to the fourth fixing portion 183B. As shown in Figures 11 and 18, the stay member 181 has a first stay 185 and a second stay 186 formed of plate material. The first stay 185 has a horizontal plate portion 185a whose plate surface faces the up-down direction, and a vertical plate portion 185b extending upward from the rear end of the horizontal plate portion 185a. The second stay 186 has a fixed plate portion 186a fixed to the lower surface of the front part of the horizontal plate portion 185a, a vertical plate portion 186b extending downward from the front end of the fixed plate portion 186a so as to widen in the aircraft width direction K2, and a pair of attachment pieces 186c extending forward from the left and right of the lower end of the vertical plate portion 186b.

[0068] As shown in FIGS. 11 and 18, a horizontal plate portion 185a of the first stay 185 has an insertion hole 187 formed therethrough. As shown in FIG. 19, an elastic member 188 made of an elastic material such as rubber is provided at the portion where the insertion hole 187 is formed. The elastic member 188 has a cylindrical portion 188a and a flange-shaped portion 188b extending from the cylindrical portion 188a. The cylindrical portion 188a is inserted through the insertion hole 187. The flange-shaped portion 188b extends radially outward from the entire circumference of the lower portion of the cylindrical portion 188a and is interposed between the horizontal plate portion 185a and the fuel tank 19. That is, the first stay 185 (horizontal plate portion 185a) abuts against the upper surface of the fuel tank 19 via the elastic member 188 (flange-shaped portion 188b). The fuel filler port portion 19a protruding upward from the upper surface of the fuel tank 19 is inserted into the cylindrical portion 188a. Therefore, the stay member 181 is movable integrally with the fuel tank 19 via the fuel filler port portion 19a.

[0069] Fuel can also be replenished through a fuel filler opening 19a to the fuel tank 19. The upper part of the fuel filler opening 19a is closed by a cap 19b. The first stay 185 is provided with a receiving member 191 that surrounds the periphery of the fuel filler opening 19a. As shown in FIG. 11, the stay attachment portion 182Ba is formed on the upper part of the frame member 182 erected on the second support piece 155b of the other mounting portion 55c2. As shown in FIG. 11 and FIG. 18, the frame member 182 has a support member 182A and a plate member 182B fixed to the front surface of the support member 182A. The plate member 182B has a stay attachment portion 182Ba on the upper part. The vertical plate portion 185b of the first stay 185 is overlapped on the front surface of the stay attachment portion 182Ba and fixed by a pair of left and right fasteners 189. The fasteners 189 are formed of bolts. A nut 190 is fixed to the back surface of the stay attachment portion 182Ba, and the fastener 189 is passed through the vertical plate portion 185b and the stay attachment portion 182Ba and screwed into the nut 190, whereby the vertical plate portion 185b is attached and fixed to the stay attachment portion 182Ba.

[0070] 7, the second stay 186 is attached to the support member 183. More specifically, the left attachment piece 186c1 is fixed to the upper part of the first support member 183A by a second fastener 192A, and the right attachment piece 186c2 is fixed to the upper part of the second support member 183B by a third fastener 192B. The fasteners 192 are formed of bolts. The stay member 181 is attached to the frame member 182 and the support member 183 by attaching the first stay 185 to the stay attachment portion 182Ba and attaching the second stay 186 to the support member 183. By attaching the stay member 181 to the frame member 182 and the support member 183, the stay member 181 (the flange-shaped portion of the elastic member 188) can be pressed against the fuel tank 19.

[0071] As shown in FIG. 6, the boss member 184 is attached to a support frame 193 that supports devices mounted on the fuselage 2 (for example, the radiator 15, a fan shroud surrounding the cooling fan 14, etc.). 6 and 20, the support frame 193 is attached to the fuselage 2. In detail, the support frame 193 has a first frame 194 and a second frame 195.

[0072] The first frame 194 has a rear support portion 194A attached to a mounting portion 196 provided on the weight 33 at its lower portion and erected on the mounting portion 196, a front support portion 194B attached to a mounting portion 197 fixed to the partition plate 34 at its lower portion and erected on the mounting portion 197, and a rear support portion 194B. The support portion 194 has a connecting portion 194C that connects the support portion 194A to the front support portion 194B. The second frame 195 has a support column 195A whose lower portion is attached to the support plate 137 and stands on the support plate 137, a front wall portion 195B extending leftward from the upper portion of the support column 195A, and an attachment piece 195C extending rightward from the upper portion of the support column 195A. The upper portion of the front support column 194B is fixed to the back surface of the front wall portion 195B.

[0073] The boss member 184 is formed of a cylinder having an internal thread on its inner circumferential surface. As shown in Fig. 7, the boss member 184 is disposed so that its axial direction coincides with the front-rear direction K1, and is fixed to the front and right side of the mounting piece 195C. The boss member 184 is fixed to the mounting piece 195C so that its axial center is at the same height as the axial center of the nut 190 into which the fixture 189 is screwed. The boss member 184 is disposed apart from the stay mounting portion 182Ba in the moving direction Y3 of the fuel tank 19.

[0074] In the third fixing device 180A and the fourth fixing device 180B, the fuel tank 19 can be fixed at the installation position S1 by the fixing device 189 and the fixing device 192. When the fuel tank 19 is pulled out from the installation position S1 to the pulled-out position S2, the fixing device 189 and the fixing device 192 are removed, and the fuel tank 19 is moved in the pulling-out direction Y2. As shown in FIG. 10, when the fuel tank 19 is moved to the pulled-out position S2, the fixing device 189 can be screwed into the boss member 184, and the fixing device 192 can be screwed into the upper part of the second support member 183B. By screwing the fixing device 189 into the boss member 184 and screwing the fixing device 192 into the upper part of the second support member 183B, the fuel tank 19 can be fixed at the pulled-out position S2 and the fuel tank 19 can be prevented from falling over.

[0075] In this embodiment, the fuel tank 19 is fixed to the pulled-out position S2 by both the third fixing device 180A and the fourth fixing device 180B, but the fuel tank 19 may be fixed to the pulled-out position S2 by only either the third fixing device 180A or the fourth fixing device 180B. 5, 6 and 18, a grease gun holder 138 that holds a grease gun 121, which is a tool for filling grease into bearings of an apparatus, is attached to vertical plate portion 186b of second stay 186. As shown in FIG. 5, grease gun 121 and grease gun holder 138 are disposed above battery 22.

[0076] In addition, the hoses connected to the fuel tank 19, such as the delivery hose 130, the drain tube 132, and the supply tube 133, are formed to be sufficiently long to allow movement when the fuel tank 19 is moved in the pull-out direction Y2. Next, a cooling air introduction structure that introduces cooling air into the motor chamber E2 that houses the motor E1 through a cooler unit including the radiator 15, the oil cooler 16, and the fuel cooler 17 will be described.

[0077] First, an outline of the cooling air intake structure will be described. 21, in addition to the motor E1, the motor compartment E2 accommodates the cooling fan 14, a fan shroud 216, the hydraulic pump 25, the exhaust gas purification device 26, and the air cleaner 27. The fan shroud 216 covers the cooling fan 14 and guides the cooling air generated by the cooling fan 14 from the radiator 15 side to the cooling fan 14.

[0078] The motor chamber E2 is made up of a partition wall 74 separating the motor E1 side from the driver's seat 6 side, a partition plate 34, a rotating base plate 31, a weight 33, a fifth cover 143E to a tenth cover 143J, etc. The fifth cover 143E to the tenth cover 143J constitute a main body portion 201A (bonnet main body) of a bonnet 201 that forms the motor chamber E2. As shown in Fig. 21, the radiator 15 is disposed between the prime mover E1 and the engine E1 in the vehicle width direction K2 with a gap therebetween. In this embodiment, the radiator 15 is disposed to the right of the prime mover E1 with a gap therebetween. The cooling fan 14 is disposed between the radiator 15 and the prime mover E1 and sends cooling air toward the prime mover E1. The radiator (cooler) 15 and the cooling fan 14 constitute a cooling device 361. The cooling device 361 is disposed between the prime mover E1 and the bonnet 201 (opening / closing duct 143D). In this embodiment, a cooling fan 14 is disposed between a radiator (cooler) 15 and a prime mover E1. However, the radiator 15 may be disposed between the cooling fan 14 and the prime mover E1. In other words, the prime mover E1, the cooling fan 14, the cooler (radiator 15), and the bonnet 201 (opening / closing duct 143D) may be disposed in the order of the bonnet 201 (opening / closing duct 143D) → the cooler (radiator 15) → the cooling fan 14 → the prime mover E1, or may be disposed in the order of the bonnet 201 (opening / closing duct 143D) → the cooling fan 14 → the cooler (radiator 15) → the prime mover E1.

[0079] In this embodiment, as shown in Figures 21 and 22, the side (right side) of bonnet body 201A on which radiator 15 is arranged is an open section 202 that is open to the right. Radiator 15, oil cooler 16, and fuel cooler 17 are arranged on the right side of open section 202, and are covered by a fourth cover (referred to as an opening / closing duct) 143D. Opening / closing duct 143D is a member that constitutes bonnet 201. In other words, bonnet 201 includes opening / closing duct 143D. The opening / closing duct 143D closes the opening 202 (the opening side of the bonnet body 201A) in an openable / closable manner. In other words, the bonnet 201 is formed so that the cooling device 361 side can be opened and closed. Further, the opening / closing duct 143D guides the outside air taken in from the outside air introduction portion 125 to the radiator 15, the oil cooler 16, etc. In other words, the opening / closing duct 143D closes the opening portion 202 on the radiator 15 side of the bonnet 201 to cover the radiator 15, the oil cooler 16, etc., and forms an air guide path 203 that guides the outside air taken in by the cooling fan 14 to the oil cooler 16, the radiator 15, etc. 21, a fixed duct 261 that guides the cooling air sucked by the cooling fan 14 to the radiator 15 side is provided on the opposite side (right side) of the radiator 15 from the prime mover E1. The outside air introduction section 125 is formed at a position above the fixed duct 261 on the upper wall section 143D1. The fixed duct 261 is provided on the bonnet 201 (opening / closing duct 143D) side of the cooling device 361. The opening / closing duct 143D is provided on the cooling device 361 side of the bonnet 201. The opening / closing duct 143D and the fixed duct 261 are connected by closing the bonnet 201 (closing the opening / closing duct 143D). That is, the opening / closing duct 143D guides the outside air taken in by the cooling fan 14 to the fixed duct 261 by closing the open part 202 of the bonnet 201. In other words, by closing the opening / closing duct 143D, an intake duct 262 is formed that flows the outside air (cooling air) taken in by the opening / closing duct 143D from the outside air introduction part 125 by the suction of the cooling fan 14 to the oil cooler 16 and the radiator 15 via the opening / closing duct 143D and the fixed duct 261. Furthermore, in other words, by closing the hood 201, the opening and closing duct 143D and the fixed duct 261 are connected, and the outside air taken in from outside the aircraft body 2 is introduced into the cooling device 361 via the opening and closing duct 143D and the fixed duct 261.

[0080] Next, the opening / closing duct 143D will be described in detail. 23 and 24A, the opening / closing duct 143D has the above-mentioned upper wall portion 143D1 and outer wall portion (side wall portion) 143D2, as well as a partition member 143D3 and a seal material 204. That is, the bonnet 201 has an outer wall portion (side wall portion) 143D2 arranged on the side of the cooling device 361, and an upper wall portion 143D1 connected to an upper portion of the outer wall portion 143D2. The opening / closing duct 143D is formed across the outer wall portion (side wall portion) 143D2 and the upper wall portion 143D1, and guides outside air taken in from the outside air introduction portion 125 downward along the outer wall portion (side wall portion) 143D2, and then circulates it through a fixed duct 261 connected to the inside of the opening / closing duct 143D in the aircraft width direction K2.

[0081] 21, the upper wall portion 143D1 is formed in an inclined shape that slopes downward toward the right and in a curved shape that protrudes upward in a rear view. The outside air introduction portion 125 is disposed to the right of the radiator 15 and the oil cooler 16. As shown in Fig. 4 and Fig. 24A, in this embodiment, the outside air introduction section 125 is configured by providing three rows of openings 125A, one above the other, in which a large number of small openings 125a opening to the right are arranged in the front-rear direction K1. Also, the outside air introduction section 125 is formed in a louver shape. There are.

[0082] 23 and 24A, a pair of front and rear mounting stays 205A, 205B and a pair of front and rear tube bosses 206A, 206B are provided on the lower surface of the upper wall portion 143D1. The pair of mounting stays 205A, 205B are provided on the right part of the upper wall portion 143D1, and the pair of tube bosses 206A, 206B are provided on the left part of the upper wall portion 143D1. As shown in FIG. 21, the outer wall portion 143D2 is located on the opposite side (right side) of the radiator 15 from the prime mover E1. In other words, the outer wall portion 143D2 is located on the opposite side of the fixed duct 261 from the radiator 15. Also, as shown in FIG. 2, the outer wall portion 143D2 is formed in a curved shape that is convex outward in a plan view so as to cover the radiator 15, the oil cooler 16, and the fuel cooler 17 from the right to the rear. As shown in FIG. 23 and FIG. 24A, a hinge mounting portion 208 is provided at the front part of the inner surface of the outer wall portion 143D2. As shown in FIG. 22, a hinge 207 is disposed at the rear part of the third cover 143C, and the hinge mounting portion 208 is attached to the hinge 207. As a result, the opening and closing duct 143D rotates forward around an axis extending in the vertical direction to open.

[0083] As shown in Fig. 24A, a pair of front and rear first mounting brackets 209A, 209B, a pair of front and rear second mounting brackets 210A, 210B, and a pair of front and rear third mounting brackets 211A, 211B are provided on the inner surface of the outer wall portion 143D2. The pair of first mounting brackets 209A, 209B and the pair of second mounting brackets 210A, 210B are provided on the upper part of the outer wall portion 143D2. The first mounting brackets 209A, 209B are provided above the second mounting brackets 210A, 210B. The pair of third mounting brackets 211A, 211B are provided on the lower part of the outer wall portion 143D2.

[0084] As shown in FIG. 23, a front mounting stay 205A is attached to a front first mounting bracket 209A with bolts, and a rear mounting stay 205B is attached to a rear first mounting bracket 209B with bolts. As shown in FIG. 21, the partition member 143D3 is disposed to the right of the radiator 15 and the oil cooler 16, and separates the space between the outer wall portion 143D2 and the fixed duct 261 (radiator 15) on the radiator 15 side relative to the outside air introduction portion 125.

[0085] 25, the partition member 143D3 has a main body portion 212 and a frame portion 213. As shown in Fig. 24A and Fig. 25, the main body portion 212 has a lower main body portion 214 and an upper main body portion 215. 21, the lower main body portion 214 is disposed at a position corresponding to the radiator 15. The upper main body portion 215 extends upward from an upper portion of the lower main body portion 214 to the vicinity of the upper wall portion 143D1.

[0086] As shown in Figures 24A and 25, the lower body part 214 has a front wall 214a, an upper wall 214b, and a lower wall 214c, and is formed in a U-shape that is open toward the rear in a side view. The front wall 214a extends in the vertical direction so that its wall surface faces the front-rear direction K1. The upper wall 214b extends rearward from the left part of the upper part of the front wall 214a so that its wall surface faces the aircraft width direction K2. The lower wall 214c extends rearward from the lower end of the front wall 214a so that its wall surface faces the vertical direction.

[0087] As shown in Fig. 24A, a first mounting piece 217 is provided on the upper right part of the front surface of the front wall 214a. As shown in Fig. 23, the first mounting piece 217 is attached to the second mounting bracket 210A of the outer wall portion 143D2 with a bolt. As shown in Fig. 28, the right edge part of the front wall 214a is located near the inner surface of the outer wall portion 143D2. As shown in Figures 24A and 25, a pair of front and rear second mounting pieces 218A, 218B are formed on the lower end of the upper wall 214b so as to protrude downward. A protruding wall (first protruding wall) 226 that protrudes leftward is formed on the left side surface of the upper wall 214b so as to extend in the front-rear direction K1. The first protruding wall 226 is provided above the second mounting pieces 218A, 218B.

[0088] As shown in Figures 24A and 25, an upwardly protruding wall (second protruding wall) 224 is formed on the upper surface of the lower wall 214c so as to extend in the front-rear direction K1. A pair of front and rear third mounting pieces 219A, 219B are formed on the protruding wall 224 so as to protrude upward. A pair of front and rear fourth mounting pieces 220A, 220B are provided on the underside of the lower wall 214c so as to protrude downward. As shown in Fig. 23, the front fourth mounting piece 220A is fixed to the front third mounting bracket 211A with a bolt, and the rear fourth mounting piece 220B is fixed to the rear third mounting bracket 211B with a bolt. As shown in Fig. 29, the right edge of the lower wall 214c is located near the outer wall portion 143D2.

[0089] As shown in FIG. 24A, the upper body portion 215 has a front wall 215a and a side wall 215b. As shown in FIG. 23, the front wall 215a extends upward from the upper end of the front wall 214a of the main body lower part 214 to the vicinity of the lower surface of the upper wall part 143D1. As shown in FIG. 29, the side wall 215b has a lower portion extending in an inclined direction that transitions to the left as it extends upward from the upper end of the upper wall 214b of the main body lower portion 214, and an upper portion extending upward from the lower end of the lower portion to near the lower surface of the upper wall portion 143D1.

[0090] 24A, the upper main body 215 is provided with a pair of front and rear fifth attachment pieces 227A, 227B and an attachment portion 228. The front fifth attachment piece 227A is provided on the upper part of the front surface of the front wall 215a. The rear fifth attachment piece 227B is provided on the upper part and rear part of the left surface of the side wall 215b. The attachment portion 228 is provided on the lower part and rear part of the left surface of the side wall 215b.

[0091] 23, the front fifth mounting piece 227A is fixed to the front tube boss 206A of the upper wall portion 143D1 by a bolt, and the rear fifth mounting piece 227B is fixed to the rear tube boss 206B by a bolt. The mounting portion 228 is fixed to the second mounting bracket 210B of the outer wall portion 143D2 by a bolt. As shown in FIGS. 25 and 30, the frame portion 213 has a frame main body 229, an engagement plate 230, an attachment plate 231, a first attachment member 232, a second attachment member 233, and a third attachment member 234.

[0092] The frame body 229 has a first frame portion 229a at the top, a second frame portion 229b located below the first frame portion 229a with a gap therebetween, a third frame portion 229c connecting the front portions of the first frame portion 229a and the second frame portion 229b, and a fourth frame portion 229d connecting the rear portions of the first frame portion 229a and the second frame portion 229b, and is formed in a rectangular shape in a side view. Therefore, the inside of the frame body 229 is formed as a rectangular opening portion 235. As shown in FIG. 28 and FIG. 29, the opening portion 235 is formed at a position corresponding to the radiator 15 (cooling device 361). The opening portion 235 also communicates with the fixed duct 261 and passes outside air (cooling air) taken from the outside air introduction portion 125 into the opening and closing duct 143D. That is, the partition member 143D3 has an opening 235 formed at a position corresponding to the radiator 15 and allowing outside air to flow to the radiator 15 side.

[0093] As shown in Fig. 30, a pair of front and rear nuts 236A, 236B are fixed to the left surface of the first frame portion 229a. The first frame portion 229a is fixed to the main body portion 212 by a bolt 240A that passes through the second mounting piece 218A and the first frame portion 229a of the main body portion 212 and is screwed into the nut 236A, and a bolt 240B that passes through the second mounting piece 218B and the first frame portion 229a of the main body portion 212 and is screwed into the nut 236B (see Figs. 23, 25, and 27).

[0094] As shown in Fig. 30, an insertion hole 238 is formed in approximately the center of the first frame portion 229a in the front-rear direction K1. As shown in Fig. 27, a nut 239 is fixed to a position corresponding to the insertion hole 238 on the right surface of the first frame portion 229a. 30, a plurality of upward-facing hooks 237 are fixed to the left surfaces of the third frame portion 229c and the fourth frame portion 229d. The plurality of hooks 237 are provided in a pair on the top and bottom of the third frame portion 229c, and also in a pair on the top and bottom of the fourth frame portion 229d.

[0095] 31, the engagement plate 230 has a lower wall 230a whose plate surface faces the up-down direction, and an engagement wall 230b extending upward from the left end of the lower wall 230a. The left end side of the lower wall 230a is fixed to the lower end of the frame main body 229, and protrudes to the right from the lower end of the frame main body 229. In addition, the left end of the lower wall 230a protrudes slightly to the left from the lower end of the frame main body 229. The engaging wall 230b is formed so that its lower portion extends in the vertical direction and its upper portion extends in an inclined direction that shifts to the left as it moves upward. The gap between the lower portion of the engaging wall 230b and the second frame portion 229b is formed to be a gap into which the lower end side of the insect net 257 described later can be inserted and held. The upper portion of the engaging wall 230b functions as a guide when inserting the lower end side of the insect net 257 between the lower portion of the engaging wall 230b and the second frame portion 229b.

[0096] As shown in Fig. 31, the mounting plate 231 is disposed so that its plate surface faces the machine body width direction K2, and its lower end is fixed to the right end of the lower wall 230a of the engagement plate 230. As shown in Fig. 30, a pair of front and rear nuts 241A, 241B are fixed to the left surface of the mounting plate 231. The mounting plate 231 is fixed to the main body 212 by a bolt 242A that penetrates the third mounting piece 219A of the main body 212 and the mounting plate 231 and is screwed into the nut 241A, and a bolt 242B that penetrates the third mounting piece 219B of the main body 212 and the mounting plate 231 and is screwed into the nut 241B.

[0097] 26 and 28, the first mounting member 232, the second mounting member 233, and the third mounting member 234 are formed of plate material. The first mounting member 232 is arranged so that the plate surface faces the body width direction K2, and its left end side is fixed to the rear end of the fourth frame portion 229d by welding or the like, and is made to protrude rightward from the fourth frame portion 229d. As shown in FIG. 28, the right end of the first mounting member 232 is located near the outer wall portion 143D2.

[0098] As shown in FIG. 30, the second mounting member 233 is disposed so that its plate surface faces the up-down direction, and is fixed to the upper end of the first mounting member 232 by welding or the like. As shown in FIGS. 25 and 27, the third attachment member 234 is disposed so that its plate surface faces the front-rear direction K1, and is fixed by welding or the like to the rear end side of the right surface of the third frame portion 229c. As shown in FIGS. 24A and 30, the sealing material 204 includes a first seal 243, a second seal 244, a third seal 245, a fourth seal 246, a fifth seal 247, a sixth seal 248, a seventh seal 249 and an eighth seal 250.

[0099] As shown in Figures 24A and 24B, the first seal 243 has a first portion 243a extending in the vertical direction, a second portion 243b extending rearward from the upper end of the first portion 243a, and a third portion 243c extending rearward from the lower end of the first portion 243a, and is formed in a U-shape that is open rearward in a side view. The first seal 243 is attached to the left side of the main body lower portion 214 of the partition member 143D3. In detail, the left edge portion of the front wall 214a is the first seal attachment portion 221, the left edge portion of the first protruding wall 226 is the second seal attachment portion 222, and the left edge portion of the lower wall 214c is the third seal attachment portion 223. The first portion 243a is attached to the first seal attachment portion 221, the second portion 243b is attached to the second seal attachment portion 222, and the third portion 243c is attached to the third seal attachment portion 223. Thus, the first seal 243 surrounds the periphery of the opening 235 on three sides.

[0100] As shown in FIG. 24B, the third seal mounting portion 223 has a first portion 223a that is inclined rightward as it moves rearward from the lower end of the first seal mounting portion 221, and a second portion 223b that extends rearward from the rear end of the first portion 223a. The second portion 223b is located to the right of the second seal mounting portion 222 (see FIG. 29). The third portion 243c of the first seal 243 is formed in a shape corresponding to the shape of the third seal mounting portion 223. That is, the third portion 243c has a front portion 243c1 that is attached to the first portion 223a of the first seal mounting portion 221, and a rear portion 243c2 that is attached to the second portion 223b of the first seal mounting portion 221.

[0101] As shown in FIG. 24A, the second seal 244 has a first portion 244a extending in the vertical direction and a second portion 244b extending rearward from the lower end of the first portion 244a. The second seal 244 is attached to the right side of the main body lower portion 214 of the partition member 143D3. More specifically, the right end edge portion of the front wall 214a of the main body lower portion 214 is defined as a fourth seal attachment portion 251, and the right end edge portion of the bottom wall 214c of the main body lower portion 214 is defined as a fifth seal attachment portion 252. As shown in FIG. 28, the first portion 244a of the second seal 244 is attached to the fourth seal attachment portion 251, and the first portion 244a abuts against the outer wall portion 143D2. As shown in FIG. 29, the fifth seal 244 is attached to the fourth seal attachment portion 251. A second portion 244b of the second seal 244 is attached to the seal attachment portion 252, and the second portion 244b abuts against the outer wall portion 143D2.

[0102] As shown in Fig. 23, the third seal 245 and the fourth seal 246 are attached to the main body upper part 215 of the partition member 143D3. More specifically, the upper end edge of the front wall 215a of the main body upper part 215 is the sixth seal attachment part 255, and the upper end edge of the side wall 215b of the main body upper part 215 is the seventh seal attachment part 256. As shown in Fig. 23, the third seal 245 is attached to the sixth seal attachment part 255, and the third seal 245 abuts against the lower surface of the upper wall part 143D1. As shown in Figs. 23 and 29, the fourth seal 246 is attached to the seventh seal attachment part 256, and the fourth seal 246 abuts against the lower surface of the upper wall part 143D1.

[0103] As shown in Fig. 30, a right edge portion of the first mounting member 232 of the frame portion 213 serves as an eighth seal mounting portion 253. As shown in Fig. 28, the fifth seal 247 is attached to the eighth seal mounting portion 253, and the fifth seal 247 abuts against the outer wall portion 143D2. As shown in Figures 27 and 30, the sixth seal 248 is attached to the second mounting member 233. As shown in Figures 23 and 26, the sixth seal 248 abuts against the outer wall portion 143D2.

[0104] As shown in FIG. 27, the seventh seal 249 is interposed between the third mounting member 234 and the front wall 214a of the main body lower part 214 of the partition member 143D3, and is attached to the third mounting member 234 and abuts against the rear surface of the front wall 214a. As shown in Figures 23 and 31, the eighth seal 250 is interposed between the rear portion of the lower wall 230a of the engagement plate 230 and the third portion 243c of the first seal 243, and seals the gap between the rear end of the second protruding wall 224 and the lower portion of the first mounting member 232.

[0105] As described above, the upper wall portion 143D1, the outer wall portion 143D2, and the partition member 143D3 form the air guide passage 203 that guides the outside air taken in through the outside air introduction portion 125 to the opening portion 235. 23 and 26, an insect net (dust net) 257 that blocks the opening 235 is attached to the frame body portion 213. The insect net 257 is disposed in the vicinity of the connection between the fixed duct 261 and the opening / closing duct 143D, and is a dust net that collects dust contained in the outside air that flows from the opening / closing duct 143D to the fixed duct 261.

[0106] As shown in Figs. 25 and 32, the insect net 257 has a net 258, a first net frame 259, and a second net frame 260. The net 258 is a mesh sheet that is breathable and prevents insects and the like from passing through, and is formed in a shape that corresponds to (blocks) the opening 235. The insect net 257 is formed by sandwiching the net 258 between the first net frame 259 and the second net frame 260 and connecting the first net frame 259 and the second net frame 260 to each other. The first net frame 259 and the second net frame 260 are formed in approximately the same shape, and have an opening 257a that corresponds to the opening 235. An upwardly projecting protrusion 257c is formed on the upper frame 257b of the insect net 257 (first net frame 259, second net frame 260), and a through hole 257d is formed in the protrusion 257c, which penetrates from the first net frame 259 to the second net frame 260. An insertion hole 257e that is long in the vertical direction is formed in the vertical frame 257g of the insect net 257 (first net frame 259, second net frame 260) through which the hook 237 of the frame body 229 can be inserted in the width direction K2 of the machine body. A handle 257f is provided on the upper frame 257b of the first net frame 259.

[0107] The insect net 257 is attached to the frame body portion 213 as follows. First, the insect protection net 257 is placed to the left (front) of the frame body 213. Next, the insect protection net 257 is moved to the right (towards the frame body 213) and the hook 237 is inserted into the insertion hole 257e. After that, the insect protection net 257 is slid downward and the lower end side of the insect protection net 257 is inserted between the lower part of the engagement wall 230b and the second frame part 229b. At this time, the upper edge side of the insertion hole 257e fits into the hook 237, restricting the downward movement of the insect protection net 257 and restricting the leftward movement of the insect protection net 257 (movement in the direction away from the frame body 213).

[0108] As a result, the insect protection net 257 is held by the multiple hooks 237, and the lower end of the insect protection net 257 is held between the lower part of the engagement wall 230b and the second frame portion 229b. In other words, the insect protection net 257 is held by the frame body portion 213. Next, the fixing tool (wing bolt) 239 is inserted through the through hole 257d and the insertion hole 238 of the first frame portion 229a and screwed into the nut 239. This allows the insect protection net 257 to be detachably fixed.

[0109] When removing the insect protection net 257, the fixing device 239 is removed, and the insect protection net 257 is lifted slightly and moved toward the front, whereby the insect protection net 257 can be easily removed. The insect net 257 may be attached to the fixed duct 261. That is, the insect net (dust net) 257 can be attached to and detached from the fixed duct 261 or the opening and closing duct 143D by opening the hood 201.

[0110] In the above-mentioned opening / closing duct 143D, no opening is formed in the outer wall portion 143D2, and the outside air introduction portion 125 is formed at a position higher than the prime mover E1 and the radiator 15. Therefore, noise inside the bonnet 201 (noise from the prime mover E1, cooling fan 14, etc.) does not leak directly to the outside from the outer wall portion 143D2, and the leakage of noise inside the bonnet 201 to the outside can be suppressed (reduced).

[0111] Moreover, since the insect prevention net 257 is attached to the frame body portion 213 from the mating surface side (outer side) of the opening / closing duct 143D with the bonnet 201, the insect prevention net 257 can be easily removed by opening the opening / closing duct 143D. Also, the insect prevention net 257 can be easily attached. Also, the insect prevention net 257 can be easily used for partitioning. Moreover, when the insect net 257 is removed for cleaning or the like, the cleaning is performed with the opening / closing duct 143D open. Therefore, when the insect net 257 is removed, the insects, dust, and the like captured by the insect net 257 fall to the outside of the machine body 2, making it easy to perform the cleaning work.

[0112] Next, the fixed duct 261 will be described. 33, the fan shroud 216 is supported via a sealant on a support base 254, the lower part of which is fixed to the swivel base plate 31, and is fixed to a first frame 194 of the support frame 193 with bolts or the like. The radiator 15 is supported in a vibration-proof manner on a mounting base 265, which is fixed to the support base 254 with bolts or the like, and is fixed to the fan shroud 216 with bolts or the like. A mounting frame 266 to which the oil cooler 16 is attached is attached to the radiator 15, and a fixed duct 261 is attached to the mounting frame 266.

[0113] As shown in Figure 35, the mounting frame 266 has an upper frame material 266A, a lower frame material 266B arranged at a distance below the upper frame material 266A, a front frame material 266C connecting the front portions of the upper frame material 266A and the lower frame material 266B, and a rear frame material 266D connecting the rear portions of the upper frame material 266A and the lower frame material 266B. The upper frame member 266A is provided with a pair of front and rear radiator mounting portions 267A, 267B, a pair of front and rear oil cooler mounting portions 268A, 268B, and a first duct mounting portion 269A.

[0114] 34, a pair of front and rear frame mounting parts 270A, 27B are provided on the upper part of the radiator 15, with the front radiator mounting part 267A being mounted to the front frame mounting part 270A and the rear radiator mounting part 267B being mounted to the rear frame mounting part 270B. The upper part of the oil cooler 16 is fixed to the pair of oil cooler mounting parts 268A, 268B with bolts or the like. The first duct mounting part 269A is configured to have a bolt insertion hole 269a and a nut member 269b fixed to a position corresponding to the bolt insertion hole 269a on the lower surface of the upper frame material 266A.

[0115] A pair of front and rear insertion pins 271A, 271B, a pair of front and rear oil cooler mounting portions 272A, 272B, and a second duct mounting portion 269B are fixed to the lower frame member 266B. The pair of front and rear insertion pins 271A, 271B are inserted into vibration-isolating members (not shown) provided on the mounting base 265. In other words, the lower frame member 266B is supported in a vibration-isolating manner on the mounting base 265. The lower part of the oil cooler 16 is fixed to the pair of oil cooler mounting portions 272A, 272B with bolts or the like. will be done.

[0116] A third duct mounting portion 269C is fixed to the upper portion of the front frame material 266C, and a fourth duct mounting portion 269D is fixed to the lower portion. A pair of upper and lower fuel cooler mounting portions 273A, 273B, to the lower part of which the fuel cooler 17 is mounted, are fixed to the rear frame member 266D. 33 to 36, the fixed duct 261 is formed of a plate material. The fixed duct 261 is configured to have a first duct component 276 at the front extending in the vertical direction, a second duct component 277 extending rearward from an upper portion of the first duct component 276, a third duct component 278 extending rearward from a lower portion of the first duct component 276, a fourth duct component 279 provided so as to extend upward from the rear end of the third duct component 278, and a seal material 280.

[0117] The first duct component 276 has a vertical plate portion 276a that is long in the up-down direction and whose plate surface faces the fuselage width direction K2, and an extending plate portion 276b that extends leftward from the front end of the vertical plate portion 276a. The right surface of the vertical plate portion 276a is a first seal abutment surface 282 with which the first portion 243a of the first seal 243 abuts. The extending plate portion 276b has a first fixing portion 281a at its upper portion and a second fixing portion 281b at its lower portion. The first fixing portion 281a is fixed to the third duct mounting portion 269C by a bolt or the like, and the second fixing portion 281b is fixed to the fourth duct mounting portion 269D by a bolt or the like.

[0118] The second duct component 277 has a vertical plate portion 277a that is long in the front-rear direction K1 and whose plate surface faces the fuselage width direction K2, and a horizontal plate portion 277b that extends leftward from the lower end of the vertical plate portion 277a. The right surface of the vertical plate portion 277a is a second seal abutment surface 283 that abuts against the second portion 243b of the first seal 243. The horizontal plate portion 277b has a third fixing portion 281c at its rear that is fixed to the first duct mounting portion 269A by a bolt or the like.

[0119] The third duct component 278 has a first vertical plate portion 278a that is long in the front-rear direction K1 and whose plate surface faces the fuselage width direction K2, a second vertical plate portion 278b that extends leftward from the rear end of the first vertical plate portion 278a and whose plate surface faces the front-rear direction K1, a third vertical plate portion 278c that extends rearward from the left end of the second vertical plate portion 278b and whose plate surface faces the fuselage width direction K2, an upper plate portion 278d that extends leftward from the upper ends of the first vertical plate portion 278a and the third vertical plate portion 278c, and an extension plate portion 278e that extends rightward from the lower end of the third vertical plate portion 278c and is connected to the lower end of the second vertical plate portion 278b. The right surface of the first vertical plate portion 278a is a third seal abutment surface 284, which is the third portion 243c of the first seal 243. The third seal abutment surface 284 has a first portion 284a and a second portion 284b. A front portion 243c1 of the third portion 243c abuts against the first portion 284a, and a rear portion 243c2 of the third portion 243c abuts against the second portion 284b. The third vertical plate portion 278c has a fourth fixing portion 281d that is fixed to the second duct mounting portion 269B by a bolt or the like.

[0120] The fourth duct component 279 extends upward from the rear of the third duct component 278 so that its plate surface faces in the front-rear direction K1. As shown in FIG. 34, the fixed duct 261 (first duct component 276, second duct component 277, third duct component 278, fourth duct component 279) extends from the radiator 15 to the right (towards the opening / closing duct 143D).

[0121] As shown in Figures 35 and 36, the seal material 280 includes a tenth seal 280A, an eleventh seal 280B, and a twelfth seal 280C. The rear end edge of the horizontal plate portion 277b of the second duct component 277 is a tenth seal mounting portion 288, to which the tenth seal 280A is attached. The right end edge of the fourth duct component 279 is an eleventh seal mounting portion 289, to which the eleventh seal 280B is attached. The right end edge of the extension plate portion 278e of the third duct component 278 is a twelfth seal mounting portion 290, to which the twelfth seal 280C is attached.

[0122] As shown in FIG 34, the right portion 286a of the bracket member 286 is interposed between the tenth seal 280A and the eleventh seal 280B. A striker that engages with a latch provided on the outer wall portion 143D2 is attached to a. As shown in Fig. 38, a base portion 286b of the bracket member 286 is fixed to the inner surface of the sixth cover 143F by welding or the like.

[0123] As shown in Fig. 34, a seal mounting wall 291 is provided to extend in the vertical direction on the rear end side of the fan shroud 216 and is located to the left of the base 286b of the bracket member 286. As shown in Fig. 34 and Fig. 38, a seal material 287 that abuts against the sixth cover 143F is provided to extend in the vertical direction at the rear end of the seal mounting wall 291. In the above structure, when the opening / closing duct 143D is closed, the first seal 243 abuts against the fixed duct 261 around the opening 235. More specifically, as shown in Figs. 28 and 39, the first portion 243a of the first seal 243 abuts against the first seal abutment surface 282 of the fixed duct 261, as shown in Figs. 29 and 39, the second portion 243b of the first seal 243 abuts against the second seal abutment surface 283 of the fixed duct 261, and as shown in Figs. 29 and 40, the third portion 243c of the first seal 243 abuts against the third seal abutment surface 284 of the fixed duct 261. When the opening / closing duct 143D is closed, as shown in Fig. 37, the tenth seal 280A, the eleventh seal 280B, and the twelfth seal 280C abut against the inner surface of the outer wall portion 143D2 of the opening / closing duct 143D. A seal material 287 provides a seal between the rear end side of the fan shroud 216 and the sixth cover 143F.

[0124] The above sealing structure prevents hot air in the engine compartment E2 from being sucked into the cooling air intake side of the radiator 15, thereby efficiently cooling the radiator 15, oil cooler 16 and fuel cooler 17, and improving the heat balance. Next, an intake structure 296 that takes in air into the prime mover E1 will be described. First, the intake structure 296 will be outlined.

[0125] 41, the air intake structure 296 has the air cleaner 27, an air intake 128 that takes in air (outside air) to be drawn into the air cleaner 27, an inlet path 298 that guides the air taken in from the air intake 128 to the air cleaner 27, and an outlet path 297 that guides the air from the air cleaner 27 to the prime mover E1. The air intake 128 is provided in a sixth cover 143F that constitutes the bonnet 201. More specifically, the air intake 128 is provided in the left part of the sixth cover 143F.

[0126] The air cleaner 27 and the inlet passage 298 are disposed within the bonnet 201 (motor compartment E2) and downstream of the cooling air F1 of the motor E1. The air cleaner 27 and the inlet passage 298 are disposed above the hydraulic pump 25. The air cleaner 27 and the inlet passage 298 are disposed to the left of the exhaust gas purification device 26 (downstream of the cooling air F1). More specifically, the exhaust gas purification device 26 is disposed to extend in the front-rear direction K1, and the air cleaner 27 is disposed to the left of the front of the exhaust gas purification device 26. The inlet passage 298 is disposed to extend rearward from between the air cleaner 27 and the exhaust gas purification device 26 to the sixth cover 143F.

[0127] The outlet passage 297 has a first outlet hose 297A connected to the air cleaner 27, a second outlet hose 297B connected to an intake connection part 299 of the prime mover E1, and a connection pipe 297C connecting the first outlet hose 297A and the second outlet hose 297B. Air taken into the air cleaner 27 via the inlet passage 298 is guided to the intake connection part 299 via the outlet passage 297, and is supplied from the intake connection part 299 to the intake manifold of the prime mover E1. As shown in FIG. 42, the first outlet hose 297A is connected to an outlet pipe 27a provided on an end plate at the front of the air cleaner 27.

[0128] The air intake 128 and inlet passage 298 will now be described in detail. 43, sixth cover 143F is formed with rectangular opening 303 that is long in the vertical direction. Opening 303 is formed in a portion corresponding to air intake 128. In other words, opening 303 is formed on the left side of sixth cover 143F and to the left of opening 127 formed in sixth cover 143F.

[0129] As shown in FIGS. 45 and 47, the opening 303 is a recess formed in the sixth cover 143F. The recess 304 is formed in a front wall 304a of the sixth cover 143F. The recess 304 is formed by recessing (recessing) the wall portion constituting the sixth cover 143F from the rear side toward the front. The opening 303 is formed in the front wall 304a toward the right (to the right of the center of the front wall 304a in the body width direction K2).

[0130] 45 and 47, a plate member 305 is disposed behind the recess 304 so as to cover the opening 303. The plate member 305 is formed in a shape corresponding to the recess 304. The plate member 305 is disposed so as to be spaced apart from the recess 304 (sixth cover 143F). In other words, the plate member 305 is disposed so that a gap 306 is formed between an outer circumferential edge portion 305a of the plate member 305 and the recess 304.

[0131] 47, a pair of upper and lower mounting stays 314A, 314B are fixed to plate member 305. Mounting stays 314A, 314B have a support wall portion 314a fixed to plate member 305 and extending forward, and a mounting wall portion 314b extending in the vertical direction from support wall portion 314a. Nuts 315 are fixed to the rear surface of mounting wall portion 314b, and mounting stays 314A, 314B are attached to air introduction box 301, which will be described later, by bolts 316 that are screwed into nuts 315.

[0132] As shown in Figs. 43 and 48, the air intake 128 is formed in the plate member 305. The air intake 128 is formed in the plate member 305, to the left of the center of the plate member 305 in the fuselage width direction K2. As shown in Fig. 48, the air intake 128 is formed in a louver shape. In detail, the air intake 128 has a through hole 128a that passes air and an inclined wall 128b that covers the upper part of the through hole 128a, and is configured by arranging the through hole 128a and the inclined wall 128b in a plurality of stages in the vertical direction. Air outside the sixth cover 143F (bonnet 201) is taken in through the through hole 128a.

[0133] The air intake 128 may be formed integrally with the sixth cover 143F (bonnet 201). As shown in FIGS. 42 and 43, the inlet path 298 has an air introduction box 301 and a connection duct 302 that connects the air introduction box 301 and the air cleaner 27.

[0134] As shown in FIG. 41, the air introduction box 301 is provided on the sixth cover 143F (bonnet 201) on the opposite side to the cooling fan 14 of the motor E1. As shown in Fig. 44 and Fig. 45, air taken in from the air intake port 128 is introduced into the air introduction box 301. That is, the air introduction box 301 forms an air intake chamber 307 into which air outside the sixth cover 143F (bonnet 201) is taken in. Also, as shown in Fig. 41, the air intake port 128 and the air introduction box 301 configure an outside air introduction section 200 provided in the bonnet 21. By connecting the outside air introduction section 200 and the air cleaner 27 with a connection duct 302, the outside air sucked into the air cleaner 27 is introduced into the outside air introduction section 200, and the outside air introduced into the outside air introduction section 200 is sucked into the air cleaner 27 via the connection duct 302. Therefore, in other words, the intake structure 296 has an air cleaner 27, an outside air introduction section 200 that takes in air (outside air) to be sucked into the air cleaner 27, a connecting duct 302 that guides the air taken in from the outside air introduction section 200 to the air cleaner 27, and an outlet path 297 that guides air from the air cleaner 27 to the prime mover E1.

[0135] 45 and 47, air intake box 301 has bottom wall 301a forming the lower surface of air intake chamber 307, upper wall 301b forming the upper surface of air intake chamber 307, first side wall 301c forming the left surface of air intake chamber 307, second side wall 301d forming the right surface of air intake chamber 307, and front wall 301e forming the front surface of air intake chamber 307, and is formed to be open at the rear. Therefore, air intake box 301 has opening 309 that opens toward sixth cover 143F (bonnet 201) and communicates with air intake port 128.

[0136] As shown in FIGS. 45 and 47, the air inlet box 301 has an opening edge 309a (between the bottom wall 301a, the top wall 301b, the first side wall 301c, and the second side wall 301d) that forms the opening 309. The sixth cover 143F is provided with the opening 309 by fixing the rear end edge 309a to the inner surface of the sixth cover 143F (bonnet 201). The opening 309 faces the opening 303, and the opening edge 309a is fixed to the periphery of the opening 303 by welding. That is, in this embodiment, the air introduction box 301 is fixed to the sixth cover 143F (bonnet 201) by welding. This separates the air introduction box 301 from the motor chamber E2, and prevents the hot air in the motor chamber E2 from being taken into the air intake chamber 307. That is, it prevents the hot air in the motor chamber E2 from being sucked into the motor E1. Even if the inlet path 298 is disposed downstream of the cooling air F1 of the exhaust gas purification device 26, the hot air on the exhaust gas purification device 26 side is prevented from being taken in. Furthermore, air inlet box 301 can suppress noise from motor room E2 (noise from motor E1, cooling fan 14, etc.) from leaking out from air intake 128 to the outside.

[0137] In this embodiment, the air intake chamber 307 is connected to the air intake port 128 via the opening 309 and the opening 303, and air taken in from the air intake port 128 is introduced into the air intake chamber 307 via the opening 309 and the opening 303. It should be noted that the air introduction box 301 is not limited to being attached to the sixth cover 143F by welding. For example, the air introduction box 301 may be removably attached to the sixth cover 143F by abutting the opening edge portion 309a against the periphery of the opening portion 303 via a sealing material and bolting a stay member fixed to the air introduction box 301 to a boss member fixed to the sixth cover 143F.

[0138] As shown in Fig. 47, the bottom wall 301a has a first edge 301a1 and a second edge 301a2. The first edge 301a1 is an edge that forms a part of the opening edge 309a, and in this embodiment, it is the rear edge of the bottom wall 301a. The second edge 301a2 is an edge that faces the first edge 301a1, and in this embodiment, it is the front edge of the bottom wall 301a. The bottom wall 301a is formed in an inclined shape that transitions downward from the second edge 301a2 toward the first edge 301a1 (toward the rear).

[0139] 47, a water draining portion 313 is provided on the sixth cover 143F (bonnet 201) side to allow water running down on the bottom wall 301a to pass outside the sixth cover 143F (bonnet 201). In this embodiment, the water draining portion 313 is configured by a gap formed between a lower edge 305a1 of the plate member 305 and a surrounding wall portion 304a1 (front wall 304a of the recess 304) around the opening portion 303, out of the gap 306 formed between the outer circumferential edge portion 305a of the plate member 305 and the recess 304.

[0140] In this embodiment, the bottom wall 301a is formed with a downward sloping rearward shape and a water drainage section 313 is provided, so that when water such as car wash water or rainwater enters the air introduction box 301 (air intake chamber 307) from the air intake port 128, the water can be discharged to the outside of the sixth cover 143F (bonnet 201). When the air intake 128 is formed integrally with the sixth cover 143F (bonnet 201), the through hole 128a at the bottom end of the air intake 128 may serve as the water draining portion 313.

[0141] 44 and 45, the second side wall 301d of the air introduction box 301 is fixed to a bracket member 310 fixed to the sixth cover 143F. A striker that engages with a latch provided on the seventh cover 143G is attached to the bracket member 310. As shown in Figures 45, 46 and 47, a rectangular insertion hole 311 that is long in the vertical direction is formed in the front wall 301e of the air introduction box 301. A pair of left and right bolt insertion holes 312a, 312b are formed in the upper and lower parts of the front wall 301e. A nut (not shown) is fixed to the rear surface of the front wall 301e at a position corresponding to the right bolt insertion hole 312b.

[0142] As shown in Figures 42, 43, and 44, the connecting duct 302 has a first duct member 317 connected to the air introduction box 301, a second duct member 318 connected to the air cleaner 27, and a third duct member 319 connecting the first duct member 317 and the second duct member 318. As shown in FIGS. 42, 43, and 44, the first duct member 317 includes an insertion portion 320 and a flange. It has a flange portion 321 and a duct main body portion 322. The insertion portion 320, the flange portion 321, and the duct main body portion 322 are arranged in this order in a direction from the rear to the front.

[0143] As shown in Figs. 45 and 47, the insertion section 320 is inserted into the air introduction box 301 (air intake chamber 307) through an insertion hole 311 formed in the front wall 301e of the air introduction box 301. The insertion section 320 is disposed offset in the horizontal direction from the air intake port 128. As shown in Figs. 44 and 45, in this embodiment, the insertion section 320 is disposed offset to the right (aircraft width direction K2) from the air intake port 128. This is not limiting, and for example, the insertion section 320 may be disposed offset upward from the air intake port 128.

[0144] 45 and 47, the insertion part 320 has a bottom wall 320a forming a bottom surface of the internal space 323 of the insertion part 320, a top wall 320b forming a top surface of the internal space 323, a first side wall 320c forming a left surface of the internal space 323, a second side wall 320d forming a right surface of the internal space 323, and a rear wall 320e forming a rear surface of the internal space 323. The internal space 323 is open forward and communicates with an internal space 324 of the duct main body 322.

[0145] An intake port 325 is formed on the connection side to the air introduction box 301, which draws air from the air intake chamber 307 into the connection duct 302. In this embodiment, the intake port 325 is formed in a wall portion (second side wall 320d) on the side farther from the air intake port 128 in the horizontal direction (aircraft width direction K2) of the insertion part 320. In other words, the intake port 325 is formed in a wall portion on the opposite side to the air intake port 128 side of the insertion part 320. That is, the intake port 325 is formed in the second side wall 320d of the insertion part 320. Therefore, the intake port 325 is provided at a position offset in the horizontal direction (or upward direction) from the air intake port 128 in the air intake chamber 307. Also, the intake port 325 faces in a direction away from the air intake port 128 (to the right) in the aircraft width direction K2.

[0146] By providing suction port 325 at a position offset horizontally (or upwardly) from air intake 128, even if water such as car wash water or rainwater enters air intake chamber 307 from air intake 128, the water can be prevented from being sucked in through suction port 325. In addition, since insertion portion 320 is offset to the right from air intake 128 and suction port 325 is formed in a wall portion facing the right of insertion portion 320, it is possible to more reliably prevent water from being sucked in through suction port 325. In addition, by shifting the positions of air intake 128 and suction port 325, sound within engine compartment E2 is prevented from leaking directly to the outside of bonnet 201.

[0147] 47, suction port 325 is formed penetrating second side wall (wall portion) 320d of insertion portion 320, and is formed from the lower end of second side wall 320d upward to the vicinity of upper wall 320b. In addition, suction port 325 is formed in a rectangular shape that is long in the vertical direction. 45, a notch 326 is formed in bottom wall 320a of insertion portion 320. Notch 326 is formed so as to communicate with the lower end of suction port 325. That is, suction port 325 and notch 326 are formed continuously. By providing notch 326, when condensation occurs inside insertion portion 320, the condensed water can be discharged.

[0148] As shown in Figs. 42 and 43, the flange portion 321 is formed to extend outward from the first duct member 317. As shown in Fig. 42, a pair of bolt insertion holes 321a, 321b are formed on the upper and lower parts of the flange portion 321. As shown in Fig. 47, the bolt insertion hole 321a coincides with the bolt insertion hole 312a, and the bolt insertion hole 321b coincides with the bolt insertion hole 312b. The flange portion 321 is fixed to the front wall 301e of the air introduction box 301 by the bolt 316. The bolt 316 inserted into the right bolt insertion hole 321b and the bolt insertion hole 312b is screwed into a nut fixed to the rear surface of the front wall 301e. The bolt 316 inserted into the left bolt insertion hole 321a and the bolt insertion hole 312a is screwed into a nut 315 fixed to the rear surface of the mounting wall portion 314b of the mounting stays 314A and 314B. When removing the plate member 305, a bolt that is screwed into the nut 315 is 3. Then, remove the bolt 316. This makes it possible to remove the plate member 305 while keeping the first duct member 317 connected to the air introduction box 301. The plate member 305 can be configured to be removed by, for example, opening the eighth cover 143H or the seventh cover 143G.

[0149] A connecting pipe portion 317a to which a third duct member 319 is connected is provided at the rear portion of the first duct member 317. The second duct member 318 is provided at its front with a connecting pipe portion 318a connected to the inlet pipe 27b of the air cleaner 27, and at its rear with a connecting pipe portion 318b connected to the third duct member 319. The second duct member 318 is narrowed midway from the connecting pipe portion 318b to the connecting pipe portion 318a.

[0150] The first duct member 317 and the second duct member 318 are formed from a hard material. The third duct member 319 is formed of an elastic member such as rubber. By forming the third duct member 319 from an elastic member, it is possible to absorb an assembly error between the first duct member 317 and the second duct member 318. That is, as shown in FIG. 49, the air cleaner 27 is attached to a mounting bracket 327 attached to the hydraulic oil tank 28. On the other hand, the air introduction box 301 is fixed to the bonnet 201. Therefore, although an assembly error may occur between the first duct member 317 and the second duct member 318, the assembly error can be absorbed by the third duct member 319 formed of an elastic member.

[0151] The third duct member 319 is narrowed on the front side (before the connection portion with the second duct member 318). In the connecting duct 302, the flow rate of the sucked air is not increased from the first duct member 317 to the second duct member 318, but is increased from the front of the third duct member 319 to the inlet pipe 27b of the air cleaner 27 so that the air is smoothly drawn into the air cleaner 27.

[0152] Next, an exhaust structure 331 that discharges exhaust gas discharged from the motor E1 to the outside of the motor chamber E2 will be described. As shown in Fig. 50, the swivel base plate 31 is provided with a plurality of discharge sections 333A, 333B, 333C for discharging the cooling air F1 after cooling the prime mover E1, etc., to the outside of the machine body 2. Each discharge section 333A, 333B, 333C communicates the inside and outside of the prime mover chamber E2 at the bottom (lower end side) of the machine body 2. Each discharge section 333A, 333B, 333C is configured by forming a number of holes in a plate material attached to the swivel base plate 31 in the front-rear direction K1 and the machine body width direction K2. The discharge sections 333A, 333B, 333C are provided at the rear and left part of the swivel base plate 31 (the lower end side of the machine body 2 and downstream of the cooling air of the prime mover E1).

[0153] 41, the cooling fan 14 blows the cooling air F1 in a direction from one side to the other side in the body width direction K2. In this embodiment, the cooling fan 14 blows the cooling air F1 in a direction from right to left. Cooling air F1 (see FIG. 41) blown from cooling fan 14 toward motor E1 passes around motor E1 (above, below, in front of and behind motor E1) and passes through discharge parts 333A, 333B, and 333C formed on swivel base plate 31, before being discharged below airframe 2. Discharge part (second discharge part) 333A is also a discharge part that discharges a mixed gas obtained by mixing exhaust gas discharged from exhaust gas purification device 26 with cooling air F1.

[0154] 4 and 50, a discharge part (first discharge part) 334 that communicates the inside and outside of the motor chamber E2 at the lower end side of the body 2 is also provided on the left side of the weight 33 that constitutes the rear part of the body 2. The discharge part 334 is a discharge part that discharges a mixed gas obtained by mixing the exhaust gas discharged from the exhaust gas purification device 26 with the cooling air F1. The discharge part 334 is formed by cutting the weight 33 upward from its lower surface.

[0155] As shown in FIG. 50, the exhaust structure 331 is disposed inside the engine chamber E2, and includes the exhaust gas purification device 26, an exhaust pipe 336, and a baffle plate device 332. The exhaust gas purification device 26 has an exhaust inlet 26A provided at the front and an exhaust outlet 26B provided at the rear. The exhaust inlet 26A takes in the exhaust gas discharged from the engine E1. The exhaust outlet 26B is a portion through which the purified exhaust gas (purified gas) is discharged. The exhaust outlet 26B extends downward from the lower surface of the rear end side of the exhaust gas purification device 26 and faces downward.

[0156] As shown in FIG. 51, exhaust pipe 336 is disposed below exhaust outlet 26B, and is flange-joined to exhaust outlet 26B by flange 26C on the exhaust outlet 26B side and flange 336A on the exhaust pipe 336 side. As shown in FIG. 53 and FIG. 55, the exhaust pipe 336 has a first pipe section 336a and a second pipe section 336b. The first pipe section 336a extends vertically downward from the flange 336A. The second pipe section 336b extends from the first pipe section 336a to the downstream side of the cooling air F1. The exhaust pipe 336 is disposed in a space not separated from the space in which the prime mover E1 is disposed in the prime mover chamber E2. Therefore, the exhaust pipe 336 discharges the exhaust gas discharged from the exhaust gas purification device 26 into the internal space of the prime mover chamber E2 (the space not separated from the space in which the prime mover E1 is disposed in the prime mover chamber E2). More specifically, the second pipe section 336b is inclined downward as it goes leftward as shown in FIG. 55, and is inclined rearward as it goes leftward as shown in FIG. 56. The exhaust pipe 336 discharges the exhaust gas from the exhaust gas purification device 26 from the upstream side to the downstream side of the cooling air F1.

[0157] Since the exhaust gas of the prime mover E1 is purified and cleaned by the exhaust gas purification device 26, in the working machine 1 of this embodiment, the exhaust gas discharged from the exhaust gas purification device 26 through the exhaust pipe 336 is discharged into the internal space of the prime mover chamber E2. However, the exhaust gas discharged from the exhaust gas purification device 26 becomes hot during purification processing by the exhaust gas purification device 26. In addition, the exhaust pipe 336 is separated (at a distance) from the discharge parts 333A, 334, and if the exhaust gas discharged from the exhaust pipe 336 is discharged into the internal space of the prime mover chamber E2, there is a risk that the heat will have an effect on the prime mover E1, the hydraulic pump 25, etc. Therefore, in this embodiment, the exhaust gas discharged from the exhaust pipe 336 is guided to the discharge parts (discharge part 334, discharge part 333A) by the straightening plate device 332 so that the exhaust gas discharged from the exhaust pipe 336 does not hit the prime mover E1, the hydraulic pump 25, etc. In addition, when the exhaust gas is guided to the exhaust parts 334 and 333A, the exhaust gas discharged from the exhaust pipe 336 is mixed with the cooling air F1 in order to lower the exhaust temperature. In other words, the straightening plate device 332 is a device that guides the mixed gas, which is a mixture of the exhaust gas discharged from the exhaust pipe 336 and the cooling air F1, to the exhaust parts 334 and 333A.

[0158] As shown in Figs. 50 to 54, the rectifying plate device 332 has a cylindrical rectifying plate body 337, a guide plate 338, and an extension plate 339. The rectifying plate body 337 guides the mixed gas from the exhaust pipe 336 side to the vicinity of the discharge parts 334, 333A (nearby, or at a position a predetermined distance away from the discharge parts 334, 333A) and releases the mixed gas in the vicinity of the discharge parts 334, 333A (nearby, or at a position a predetermined distance away from the discharge parts 334, 333A). The guide plate 338 guides the mixed gas released from the rectifying plate body 337 to the discharge part (first discharge part) 334. The extension plate 339 guides the mixed gas released from the rectifying plate body 337 to the discharge part (second discharge part) 333A.

[0159] As shown in FIG. 54, the current plate body 337 is formed in an inclined shape that slopes downward from the exhaust pipe side 336 toward the exhaust portions 334, 333A toward the other side (left side). 53 and 54, the straightening plate body 337 has a first component 340 and a second component 341 arranged on the downstream side (the other side) of the cooling air F1 with respect to the first component 340. The first component 340 and the second component 341 are connected to each other. That is, the second component 341 is connected to a position on the other side of the first component 340.

[0160] As shown in Figures 57 and 58, the first component 340 is formed in a cylindrical shape that opens to the right (upstream side of the cooling air F1) and left (downstream side of the cooling air F1). The opening on the right side of the first component 340 opens to one side (the right side, the exhaust pipe 336 side) and serves as an inlet opening 342 that takes in the cooling air F1. The opening on the left side of the first component 340 serves as an outlet opening 343 that discharges (emits) a mixed gas of the cooling air F1 and the exhaust gas. The inlet opening 342 opens to the upstream side of the cooling air F1, and the outlet opening 343 opens to the downstream side of the cooling air F1. The inlet opening 342 is open toward the downstream side of the wind F1. The inlet opening 342 is formed in a rectangular shape that is sufficiently large compared to the diameter of the exhaust pipe 336. The size of the inlet opening 342 is not limited, but is formed so that, for example, the vertical dimension of the inlet opening 342 is three times or more the diameter of the exhaust pipe 336, and the horizontal dimension of the inlet opening 342 is two times or more the diameter of the exhaust pipe 336.

[0161] As shown in FIG. 55, an outlet portion 336c of exhaust gas from the exhaust pipe 336 is disposed near the inlet opening 342 or inside the cylindrical straightening plate body. In this embodiment, the outlet portion 336c side (second pipe portion 336b) of the exhaust pipe 336 is inserted into the upper part of the straightening plate body 337 through the inlet opening 342. Therefore, when exhaust gas is discharged from the exhaust pipe 336, the exhaust gas discharged from the exhaust pipe 336 and the cooling air F1 taken in from the inlet opening 342 are mixed inside the first component 340 (straightening plate body 337). This makes it possible to lower the exhaust temperature of the exhaust gas. The mixed gas of the exhaust gas discharged from the exhaust pipe 336 and the cooling air F1 is discharged from the outlet opening 343.

[0162] The outlet portion 336 c of the exhaust pipe 336 does not necessarily have to be inserted into the upper portion of the straightening plate main body 337 . As shown in FIG. 57 and FIG. 58, the first component 340 has an upper plate 344 and a lower plate 345 whose plate surfaces face the up-down direction, a pair of front and rear vertical plates 346A, 346B whose plate surfaces face the front-rear direction K1, and a connecting plate 347 whose plate surface faces the fuselage width direction K2. The right part 344a of the upper plate 344 is formed so that the plate surface faces the vertical direction. The left part 344b of the upper plate 344 is formed in an inclined shape that transitions downward as it goes leftward. The right part 345a of the lower plate 345 is disposed below the right part 344a of the upper plate 344 and opposed thereto with a gap therebetween. As shown in FIG. 55, the left part 345b of the lower plate 345 is formed in an inclined shape that transitions downward as it goes leftward, and in the inclination direction, it protrudes leftward (downstream of the cooling air F1) from the left part of the upper plate 344. 56, the left part 345b of the lower plate 345 is formed in an inclined shape that transitions forward as it approaches leftward in a plan view. Similarly to the left part 345b of the lower plate 345, the left part 344b of the upper plate 344 is also formed in an inclined shape that transitions forward as it approaches leftward.

[0163] As shown in Figures 57 and 58, the pair of vertical plates 346A, 346B are disposed between the upper plate 344 and the lower plate 345 at an interval in the front-rear direction K1, and connect the upper plate 344 and the lower plate. In detail, the front vertical plate 346A is disposed between the front ends of the upper plate 344 and the lower plate 345 to connect the upper plate 344 and the lower plate 345, and the rear vertical plate 346B is disposed between the rear ends of the upper plate 344 and the lower plate 345 to connect the upper plate 344 and the lower plate 345. As shown in Figure 56, the pair of vertical plates 346A, 346B are formed in an inclined shape such that the right parts 346Aa, 346Ba extend in the fuselage width direction K2, and the left parts 346Ab, 346Bb move forward as they move leftward.

[0164] As shown in FIG. 57, the connecting plate 347 extends downward from the left end of the lower plate 345. As shown in FIG. 56, the exhaust gas discharged from the exhaust pipe 336 is blown against the inner surface of the rear vertical plate 346B in an inclined direction that shifts rearward as it moves leftward. By blowing the exhaust gas discharged from the exhaust pipe 336 against the inner surface of the first component 340 (blowback plate main body 337), the flow velocity of the exhaust gas discharged from the exhaust pipe 336 can be reduced, and the exhaust gas and the cooling air F1 can be mixed well to reduce the exhaust temperature. In addition, the flow of the exhaust gas can be rectified. The exhaust gas discharged from the exhaust pipe 336 is guided by the rear vertical plate 346B and the upper plate 344, etc., and is discharged from the outlet opening 343.

[0165] The exhaust gas discharged from the exhaust pipe 336 is not limited to being blown onto the inner surface of the rear vertical plate 346B, but may be blown onto the front vertical plate 346A. In this case, the inner wall surface of the weight 33 may be used as a member equivalent to the rear vertical plate 346B. As shown in Figures 57 and 58, a first mounting stay 348 is fixed to the rear of the right part 344a of the upper plate 344. As shown in Figure 51, a bracket stay 349 is attached to the first mounting stay 348. As shown in Figure 50, the bracket stay 349 is attached to an attachment part 350 provided on the weight 33.

[0166] As shown in FIGS. 57 and 58, a second mounting stay 351 is fixed to the left end side of the left portion 344b of the upper plate 344. As shown in Figures 59, 60, and 61, the second constituent body 341 has an upper plate 352 whose plate surface faces the up-down direction, a side plate 353 whose plate surface faces the fuselage width direction K2, and a pair of front and rear vertical plates 354A and 354B whose plate surfaces face the front-rear direction K1. The upper plate 352 is formed in an inclined shape that transitions downward as it moves leftward. The side plate 353 is disposed below the right end of the upper plate 352 with a gap therebetween. The front vertical plate 354A is disposed below the front end of the upper plate 352, and its upper edge is fixed to the lower surface of the upper plate 352. The lower part of the front vertical plate 354A is fixed to the front end of the side plate 353. The rear vertical plate 354B is disposed below the rear end of the upper plate 352, and its upper edge is fixed to the lower surface of the upper plate 352. The lower part of the rear vertical plate 354B is fixed to the upper part of the rear end of the side plate 353. Therefore, air flows in the front-rear direction K1 below the rear vertical plate 354B (see FIG. 61). As shown in FIG. 56, the pair of vertical plates 354A, 354B are formed in an inclined shape that transitions forward as it goes leftward.

[0167] 59, a third attachment stay 355 is fixed to the right end side of the front part of the upper surface of the upper plate 352. A fourth attachment stay 356 is fixed to the lower front surface of the front vertical plate 354A. As shown in Fig. 59, an opening 357 is formed by a right edge 352a of the upper plate 352, an upper edge 353a of the side plate 353, and right edges 354Aa, 354Ba of a pair of vertical plates 354A, 354B. This opening 357 is formed larger than the outlet opening 343 of the first component 340. As a result, as shown in Figs. 55 and 56, a gap 359 is formed at a connection portion 358 between the first component 340 and the second component 341. The gap 359 takes in the cooling air F1 from one side (the right side) and the outside of the first component 340 to the inside of the second component 341. Specifically, as shown in FIG. 55, a gap 359a is formed between the upper plate 344 of the first component 340 and the upper plate 352 of the second component 341, and as shown in FIG. 56, a gap 359b is formed between the front vertical plate 346A of the first component 340 and the front vertical plate 354A of the second component 341, and a gap 359c is formed between the rear vertical plate 346B of the first component 340 and the rear vertical plate 354B of the second component 341. Therefore, the exhaust gas discharged from the exhaust pipe 336 takes in the cooling air F1 from the upstream side into the straightening plate main body 337. That is, the straightening plate main body 337 has a gap 359 that takes in the cooling air F1 from the upstream side at the connection portion 358 between the first component 340 and the second component 341. By taking in the cooling air F1 from the gap 359, the temperature of the exhaust gas can be lowered.

[0168] As shown in Fig. 54, an upper portion of the side plate 353 is placed on the left surface of the connecting plate 347 and attached to the connecting plate 347. The third mounting stay 355 is attached to the second mounting stay 351. As shown in Fig. 50, the fourth mounting stay 356 is attached to the swivel base plate 31. The upper plates 344 and 352 constitute the upper plates of the current plate body 337. The front vertical plates 346A and 354A constitute the front vertical plates of the current plate body 337. The rear vertical plates 346B and 354B constitute the rear vertical plates of the current plate body 337. The lower plate 345 constitutes the lower plate 345 of the current plate body 337.

[0169] 61, the guide plate 338 is disposed rearward of the lower part of the front vertical plate 354A of the second component 341 and to the left of the lower part of the side plate 353. The guide plate 338 is disposed in a slanted manner that transitions downward as it moves rearward from the vertical plate 354A, and also in a slanted manner that transitions downward as it moves leftward from the side plate 353. As shown in FIG. 61, the front end of the guide plate 338 is fixed to the vertical plate 354A, and the right end of the guide plate 338 is fixed to the side plate 353.

[0170] As shown in FIG. 54, the guide plate 338 is disposed at a position corresponding to the discharge portion 334 . As shown in Fig. 56, the extension plate 339 extends leftward from the left end of the front vertical plate 354A of the second component 341. The extension plate 339 extends in the same direction as the front vertical plate 354A. More specifically, the extension plate 339 extends in an inclined direction that transitions forward as it approaches the left. The extension plate 339 extends above the discharge portion 333A from the vertical plate 354A.

[0171] In the above-mentioned straightening plate device 332, the exhaust gas discharged from the exhaust pipe 336 to the upper part of the straightening plate body 337 is mixed with the cooling air F1 taken in from the inlet opening 342, and the mixed gas mixture is guided to the outlet opening 343 and discharged from the outlet opening 343. The mixed gas discharged from the outlet opening 343 is guided to the vertical plate 354B and the upper plate 352 on the rear side of the second component 341 and discharged near the discharge parts 334 and 333A. In other words, the straightening plate body 337 guides the mixed gas from the exhaust pipe 336 side to the vicinity of the discharge parts 334 and 333A and discharges it. The mixed gas discharged from the straightening plate body 337 decreases in flow velocity and is further mixed with the cooling air F1, which can reduce the exhaust temperature.

[0172] In this embodiment, the exhaust gas discharged from the exhaust pipe 336 is mixed with the cooling air F1 at the upper part of the straightening plate body 337 and also mixed with the cooling air F1 in the vicinity of the discharge parts 334, 333A, so that it is possible to sufficiently lower the exhaust temperature of the exhaust gas discharged from the exhaust gas purification device 26. In addition, the exhaust gas is released (released) from the straightening plate body 337 before being discharged from the discharge parts 334, 333A, so that it is possible to sufficiently lower the flow velocity.

[0173] A portion of the mixed gas released from the straightening plate main body 337 is guided by the guide plate 338 and released from the discharge section 334 to the outside of the aircraft body 2, and another portion of the mixed gas released from the straightening plate main body 337 is guided by the extension plate 339 to the discharge section 333A and released from the discharge section 333A below the swivel base 31 together with the cooling air F1 flowing from above the extension plate 339. When the condensed water is discharged from the exhaust pipe 336, the guide plate 338 guides the condensed water to the discharge portion 334. The condensed water guided to the discharge portion 334 is discharged from the discharge portion 334 to the outside of the airframe 2.

[0174] The extension plate 339 regulates the flow of the mixed gas discharged from the flow straightening plate body 337 so that the mixed gas discharged does not flow toward the hydraulic pump 25 side. In the above embodiment, a part of the mixed gas discharged from the straightening plate main body 337 is discharged to the outside of the airframe 2 from the discharge part 334 formed in the weight 33, but the discharge part 334 may not be provided in the weight 33. In this case, a discharge part equivalent to the discharge part 334 may be provided in the swivel base plate 31.

[0175] In addition, instead of discharging the mixed gas released from the straightening plate main body 337 just before the discharge section 334, it is also possible to extend a guide tube from the outlet opening 343 of the straightening plate main body 337 to the discharge section 334 and discharge the mixed gas from the discharge section 334. The work machine 1 comprises a body 2, a support base 52 mounted on the body 2, and a tank (fuel tank 19) supported on the support base 52 so as to be movable horizontally at an installation position S1 and at a pull-out position S2 pulled out from the installation position S1.

[0176] According to this configuration, maintenance of the tank or a device disposed in the vicinity of the tank can be easily performed by pulling the tank out from its installation position, thereby improving maintainability. Also, a fixing device 141 is provided that can fix the tank 19 at the installation position S1 and the pull-out position S2. According to this configuration, the tank 19 can be fixed at the installation position S1 and the pull-out position S2, and the fixation of the tank 19 can be stabilized at the installation position S1 while preventing the tank 19 from tipping over at the pull-out position S2.

[0177] The fixing device 141 also includes a fixing band device 160 having a band 161 that fixes the tank 19 in the installation position S1. According to this configuration, the tank 19 can be stably fixed at the installation position S1. The fixing band device 160 also has a hanging member 162 arranged near the bottom of the tank 19, a fixed piece 163 arranged on the opposite side of the hanging member 162 so as to sandwich the tank 19, a band 161 arranged from the hanging member 162 over the upper surface of the tank 19 to the fixed piece 163, a band hook 164 provided on one longitudinal end of the band 161 and hooked onto the hanging member 162, and a band fastener 165 provided on the other longitudinal end of the band 161 for tensioning the band 161 and fixing it to the fixed piece 163.

[0178] This configuration also allows the tank 19 to be stably fixed at the installation position S1. The fixing device 141 also includes an engaging portion 171 provided on the support base 52, and a first engaged portion 172 and a second engaged portion 173 provided on the tank 19 at a distance from each other in the movement direction Y3 of the tank 19, wherein the first engaged portion 172 engages with the engaging portion 171 when the tank 19 is in the installation position S1 to restrict movement of the tank 19 in the pull-out direction Y2 from the installation position S1 to the pull-out position S2 and in the push-in direction Y1 from the pull-out position S2 to the installation position S1, and the second engaged portion 173 engages with the engaging portion 171 when the tank 19 is in the pull-out position S2 to restrict movement of the tank 19 in the pull-out direction Y2 and the push-in direction Y1.

[0179] According to this configuration, the tank 19 can be easily positioned and fixed at the installation position S1 and the pull-out position S2. In addition, the engagement portion 171 is a roller provided on the mounting portions 55c1, 55c2 on the support base 52 on which the tank 19 is placed, and the first engaged portion 172 and the second engaged portion 173 are recesses formed on the bottom surface of the tank 19 into which the rollers fit.

[0180] According to this configuration, the tank 19 can be easily moved even if the tank 19 has a large content. The first engaged portion 172 has a first regulating surface 172A that abuts against the engaging portion 171 on the front side in the pulling-out direction Y2 when the tank 19 is in the installation position S1 to regulate the movement of the tank 19 in the pushing-in direction Y1, and a first guide surface 172B that abuts against the engaging portion 171 on the rear side in the pulling-out direction Y2 when the tank 19 is in the installation position S1 to regulate the movement of the tank 19 in the pulling-out direction Y2 and that is formed in an inclined shape that transitions from the top of the recess toward the pushing-in direction Y1 as it moves downward. The second engaged portion 173 has a second regulating surface 173A that abuts against the engaging portion 171 on the front side in the pushing-in direction Y1 when the tank 19 is in the pulled-out position S2, thereby regulating movement of the tank 19 in the pulling-out direction Y2, and a second guide surface 173B that abuts against the engaging portion 171 on the rear side in the pushing-in direction Y1 when the tank 19 is in the pulled-out position S2, thereby regulating movement of the tank 19 in the pushing-in direction Y1, and is formed in an inclined shape that transitions from the top of the recess toward the pulling-out direction Y2 as it moves downward.

[0181] According to this configuration, the tank 19, which can be positioned and fixed at the installation position S1 and the pull-out position S2, can be easily moved between the installation position S1 and the pull-out position S2. The fixing device 141 also includes a stay member 181 that is attached to the tank 19 so as to be movable integrally with the tank 19, a first fixing portion (stay mounting portion 182Ba) and a second fixing portion (boss member 184) that are attached to the body 2 side and spaced apart in the movement direction Y3 of the tank 19, and a first fixing device (fixing device 189) that fixes the stay member 181 to the first fixing portion 182Ba when the tank 19 is in the installation position S1 and fixes the stay member 181 to the second fixing portion 184 when the tank 19 is in the pulled-out position S2.

[0182] According to this configuration, the structure of the fixing device 141 can be simplified. The fixing device 141 also includes a third fixing portion (first support member 183A) and a fourth fixing portion (second support member 183B) provided on the aircraft body 2 side at a distance in the movement direction Y3 of the tank 19, a second fixing device 192A that fixes the stay member 181 to the third fixing portion 183A when the tank 19 is in the installation position S1, and a third fixing device 192B that fixes the stay member 181 to the fourth fixing portion 183B when the tank 19 is in the installation position S1, and the fourth fixing portion 183B is arranged on the pull-out direction Y2 side from the installation position S1 to the pull-out position S2 relative to the third fixing portion 183A, and fixes the stay member 181 to the fourth fixing portion 183B by the third fixing device 192B when the tank 19 is in the pull-out position S2.

[0183] According to this configuration, the structure of the fixing device 141 can be simplified. The tank 19 also has a tank body 19A and a protruding portion 19C that protrudes downward from the bottom of the tank body 19A. According to this configuration, the provision of the protruding portion 19C makes it possible to separate water. Also, the aircraft may include a prime mover E1 mounted on the fuselage 2, and the tank 19 may be a fuel tank that stores fuel for the prime mover E1.

[0184] The work machine 1 includes a machine body 2, a prime mover E1 mounted on the machine body 2, and a storage container for accommodating the prime mover E1. The engine 361 includes a bonnet 201 which defines a prime mover compartment E2 and is formed so as to be openable and closable, a cooling device 361 having a cooler (radiator 15) and a cooling fan 14 arranged between the prime mover E1 and the bonnet 201, a fixed duct 261 provided on the bonnet 201 side of the cooling device 361, and an opening / closing duct 143D provided on the cooling device 361 side of the bonnet 201, and by closing the bonnet 201, the opening / closing duct 143D and the fixed duct 261 are connected, and outside air taken in from outside the aircraft body 2 is introduced into the cooling device 361 via the opening / closing duct 143D and the fixed duct 261.

[0185] According to this configuration, a duct structure is formed between the bonnet 201 and the cooling device 361, so that sound leaking from the engine compartment E2 to the outside can be suppressed. In addition, the bonnet 201 has a side wall portion (outer wall portion 143D2) arranged to the side of the cooling device 361 and an upper wall portion 143D1 connected to the upper part of the side wall portion 143D2, and an outside air inlet portion 125 that takes in outside air from outside the aircraft body 2 into the opening / closing duct 143D is formed at a position above the fixed duct 261 in the upper wall portion 143D1, and the opening / closing duct 143D is formed across the side wall portion 143D2 and the upper wall portion 143D1, and the outside air taken in from the outside air inlet portion 125 is guided downward along the side wall portion 143D2 and then circulated to a fixed duct 251 connected to the inside of the opening / closing duct 143D in the aircraft width direction K2.

[0186] According to this configuration, noise inside the bonnet 201 can be prevented from leaking to the outside. In addition, the opening / closing duct 143D is formed by a side wall portion 143D2, an upper wall portion 143D1, and a partition member 143D3 arranged on the inside side of the body 2 relative to the side wall portion 143D2 and the upper wall portion 143D1, and the partition member 143D3 has an opening 235 formed at a position corresponding to the cooling device 361 and allowing outside air to circulate to the fixed duct 261.

[0187] According to this configuration, the outside air taken in through the outside air introduction portion 125 formed in the upper wall portion 143D1 can be guided to the fixed duct 261. Also, a seal material (first seal 243) is provided to seal the connection between the opening / closing duct 143D and the fixed duct 261 when the bonnet 201 is closed. According to this configuration, the outside air can be suitably guided to the cooler 15 from the opening and closing duct 143D. In addition, a dustproof net 257 for collecting dust contained in the outside air flowing from the opening / closing duct 143D2 to the fixed duct 261 is provided near the connection between the fixed duct 261 and the opening / closing duct 143D2. According to this configuration, the dustproof net 257 can be accessed by opening the opening / closing duct 143D, and cleaning of the dustproof net 257 can be easily performed. Moreover, the dustproof net 257 can be attached to and detached from the fixed duct 261 or the openable / closable duct 143D by opening the bonnet 201.

[0188] According to this configuration, the dustproof net 257 can be easily attached and detached. The work machine 1 also includes a body 2, a prime mover E1 mounted on the body 2, a cooling fan 14 that sends cooling air F1 toward the prime mover E1, an air cleaner 27 arranged downstream of the cooling air F1 relative to the prime mover E1, a bonnet 201 that forms a prime mover compartment E2 that houses the prime mover E1, an air introduction section 200 provided in the bonnet 201 on the opposite side of the prime mover E1 to the cooling fan 14, and a connecting duct 302 that connects the air introduction section 200 and the air cleaner 27.

[0189] According to this configuration, the air introduction section 200 is provided on the bonnet 201 on the opposite side of the cooling fan 14 of the prime mover E1, and this air introduction section 200 and the air cleaner 27 are connected by a connecting duct 302, so that the intake side path for the air cleaner 27 does not obstruct the flow of cooling air F1 flowing around the prime mover E1, and the flow of cooling air F1 can be improved.

[0190] Moreover, the air introduction section 200 is provided with an air introduction box 301 which forms an air intake chamber 307 into which air outside the bonnet 201 is taken in, and the connection duct 302 is connected to the air introduction box 301 . According to this configuration, outside air can be effectively sucked into the air cleaner 27 on the opposite side of the engine E1 from the cooling fan 14. In addition, the air introduction section 200 has an air intake port 128 that takes in air from outside the bonnet 201 into the air intake chamber 307, and the connecting duct 302 has an intake port 325 that draws air from the air intake chamber 307 into the connecting duct 302, and the intake port 325 is located at a position offset horizontally or upwardly from the air intake port 128 within the air intake chamber 307.

[0191] According to this configuration, even if water such as car wash water or rainwater enters through air introduction portion 128, the water can be prevented from being sucked into suction port 325. In addition, the connecting duct 302 has an insertion portion 320 that is inserted into the air intake chamber 307, the insertion portion 320 being positioned offset horizontally or upwardly from the air intake 128, and the suction port 325 being formed in a wall portion (second side wall 320d) of the insertion portion 320 on the opposite side to the air intake 128 side.

[0192] According to this configuration, even if water enters through air introduction portion 128, the water can be more reliably prevented from being sucked into suction port 325. In addition, the insertion portion 320 is positioned offset horizontally from the air intake 128, and the suction port 325 penetrates the wall portion 320d and is formed upward from the lower end of the wall portion 320d. The insertion portion 320 has a lower wall 320a that forms the lower surface of the internal space of the insertion portion 320, and the lower wall 320a has a notch 326 that communicates with the lower end of the suction port 325.

[0193] According to this configuration, when condensation occurs inside the connection duct 302, the condensed water can be discharged from the notch 326. Moreover, air introduction box 301 has an opening 309 that opens toward bonnet 201 and communicates with air intake port 128 , and the opening edge portion that forms opening 309 is fixed to the inner surface of bonnet 201 .

[0194] According to this configuration, the inside of bonnet 201 and the inside of air intake chamber 307 can be separated, and it is possible to prevent prime mover E1 from sucking in hot air inside bonnet 201. In addition, it is possible to suppress noise inside bonnet 201 from leaking out from air introduction portion 128. In addition, air introduction box 301 has a bottom wall 301a which forms the lower surface of air intake chamber 307, and bottom wall 301a has a first edge 301a1 which forms opening edge 309a and a second edge 301a2 which faces first edge 301a1, and is formed in an inclined shape which transitions downward as it moves from second edge 301a2 to first edge 301a1, and bonnet 201 has a water drainage section 313 which allows water running over bottom wall 301a to pass to the outside of bonnet 201.

[0195] According to this configuration, even if water enters through the air inlet portion 128, the water can be discharged to the outside of the bonnet 201. The bonnet 201 also has an aperture 303 facing the opening 309 and having an opening edge 309a fixed around its periphery, and a plate member 305 arranged to cover the aperture 303 from the outside and having an air intake 128 formed therein, and the water drainage portion 313 is constituted by a gap 306 formed between the lower edge 305a1 of the plate member 305 and the peripheral wall portion 304a1 around the aperture 303.

[0196] According to this configuration, the water draining portion 313 can be easily formed. In addition, the connecting duct 302 has a first duct member 317 connected to the air introduction section 200, a second duct member 318 connected to the air cleaner 27, and a third duct member 319 formed of an elastic member that connects the first duct member 317 and the second duct member 318.

[0197] According to this configuration, the third duct member 319 can absorb any assembly error between the air induction box 301 and the first duct member 317 and the air cleaner 27 and the second duct member 318. The work machine 1 includes a body 2, a prime mover E1 mounted on the body 2, a prime mover room E2 that houses the prime mover E1, a cooling fan 14 that blows cooling air toward the prime mover E1, and a cooling fan 14 mounted on the bottom of the body 2. The engine room E2 is provided with exhaust sections 334, 333A that communicate the inside and outside of the engine room E2, an exhaust gas purification device 26 that purifies the exhaust gas discharged from the engine E1, an exhaust pipe 336 that discharges the exhaust gas discharged from the exhaust gas purification device 26 into the internal space of the engine room E2, and a straightening plate device 332 that guides a mixed gas of the exhaust gas discharged from the exhaust pipe 336 and cooling air to the exhaust sections 334, 333A.

[0198] According to this configuration, the exhaust gas discharged from the exhaust gas purification device 26 is released inside the engine chamber E2, and the released exhaust gas is mixed with cooling air inside the engine chamber E2 and released to the outside, thereby reducing the exhaust temperature and exhaust noise. The current plate device 332 also has a cylindrical current plate body 337 that takes in the mixed gas from the exhaust pipe 336 side and releases it in the vicinity of the exhaust portions 334 and 333A.

[0199] According to this configuration, by discharging the mixed gas, which is a mixture of the exhaust gas discharged from the exhaust pipe 336 and the cooling air F1, near the discharge parts 334, 333A, the mixed gas is mixed with the cooling air F1 even near the discharge parts 334, 333A, and the temperature of the exhaust gas can be sufficiently lowered. Also, by discharging the mixed gas near the discharge parts 334, 333A, the flow velocity of the exhaust gas discharged from the discharge parts 334, 333A can be reduced. In addition, the cooling fan 14 sends the cooling air F1 in a direction from one side to the other side in the width direction K2 of the body, and the baffle plate main body 337 is formed in an inclined shape that transitions downward as it approaches the other side from the exhaust pipe 336 side toward the exhaust sections 334, 333A side, and has an inlet opening 342 that opens toward one side on the exhaust pipe 336 side and takes in the cooling air F1, and the outlet portion 336c of the exhaust gas from the exhaust pipe 336 is located near the inlet opening 342 or inside the cylindrical baffle plate main body 337.

[0200] According to this configuration, a distance is provided between exhaust pipe 336 and discharge sections 334, 333A, and the exhaust gas discharged from exhaust pipe 336 and cooling air F1 can be further mixed between exhaust pipe 336 and discharge sections 334, 333A. Further, the exhaust pipe 336 is formed in such a direction that the exhaust gas is blown against the inner surface of the straightening plate body 337 .

[0201] With this configuration, the flow velocity of the exhaust gas can be reduced. In addition, the aircraft body 2 has a weight 33 that forms the rear part of the aircraft body 2, and the discharge sections 334, 333A include a first discharge section 334 formed in the weight 33, and the baffle plate device 332 extends from the baffle plate main body 337 toward the first discharge section 334 side and has a guide plate 338 that guides the mixed gas released from the baffle plate main body 337 to the first discharge section 334.

[0202] According to this configuration, the mixed gas discharged near the first discharge portion 334 can be guided to the first discharge portion 334. The aircraft body 2 also has a base plate 31 on which the prime mover E1 is mounted, and the discharge sections 334, 333A include a second discharge section 333A formed on the base plate 31, and the baffle plate device 332 has an extension plate 339 that extends from the baffle plate main body 337 above the second discharge section 333A and guides the mixed gas released from the baffle plate main body 337 to the second discharge section 333A.

[0203] According to this configuration, the mixed gas discharged near the second discharge part 333A can be guided to the second discharge part 333A. In addition, the cooling fan 14 sends the cooling air F1 in a direction from one side to the other side in the width direction K2 of the body, and the baffle plate main body 337 has a first component 340 and a second component 341 connected to a position on the other side of the first component 340, and has a gap 359 provided at the connection portion between the first component 340 and the second component 341 to take in the cooling air F1 from one side and the outside of the first component 340 to the inside of the second component 341.

[0204] With this configuration, the temperature of the exhaust gas can be further reduced. Although one embodiment of the present invention has been described above, the embodiment disclosed herein should be considered as illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0205] 2. Aircraft 19 Tank (fuel tank) 19A Tank body 19C Protrusion 52 Support stand 55c1 Placement part 141 Fixation device 160 Fixed band device 161 bands 162 Hooking member 163 Fixed piece 164 Band hook 165 Band Fixture 171 Engagement part 172 First engaged part 172A First regulatory aspect 172B First guide surface 173 Second engaged part 173A Second regulatory aspect 173B Second guide surface 181 Stay member 182Ba First fixed part (stay attachment part) 183A Third fixing part (first support member) 183B Fourth fixing part (second support member) 184 Second fixing part (boss member) 189 First fixture (fixing fixture) 192A Second fixture (fixing fixture) 193B Third fixture (fixing fixture) 243 Sealing material (first seal) E1 Prime Mover S1 installation position S2 Pull-out position Y1 Push direction Y2 Pull-out direction Y3 Movement direction

Claims

1. The aircraft and A support platform mounted on the airframe; a tank supported on the support stand so as to be movable in a horizontal movement direction between an installation position and a withdrawal position withdrawn from the installation position; A stay member provided on the tank so as to be movable integrally with the tank; a fixing portion provided on the aircraft body to which the stay member is fixed; Equipped with the support base has a mounting portion on which a mounting lower surface provided on a bottom portion of the tank is placed to support the tank movably in the movement direction, The stay member is provided on an upper portion of the tank, and is fixed to the fixing portion when the tank is in the pulled-out position.

2. 2. The work machine according to claim 1, further comprising a fixing device capable of fixing the tank at the installed position and the pulled-out position.

3. The fixing device includes a fixing band device having a band for fixing the tank in the installed position, The fixing band device is a latch member disposed adjacent a lower portion of the tank; a fixing piece disposed on the opposite side of the hook member so as to sandwich the tank; The band is disposed from the hook member through the upper surface of the tank to the fixing piece; a band hook provided on one end side of the band in the longitudinal direction and hooked onto the hook member; 3. The work machine according to claim 2, further comprising a band fixing device provided on the other longitudinal end side of the band for tensioning the band and fixing it to the fixing piece.

4. The aircraft and A support platform mounted on the airframe; a tank supported on the support stand so as to be horizontally movable between an installation position and a withdrawal position withdrawn from the installation position; A fixing device capable of fixing the tank at the installation position and the withdrawal position; Equipped with The fixing device comprises: An engagement portion provided on the support base; a first engaged portion and a second engaged portion provided on the tank and spaced apart from each other in a moving direction of the tank; Including, the first engaged portion engages with the engaging portion when the tank is in the installed position to restrict movement of the tank in a pull-out direction from the installed position to the pulled-out position and in a push-in direction from the pulled-out position to the installed position, The second engaged portion engages with the engaging portion when the tank is in the pulled-out position to restrict movement of the tank in the pulling-out direction and the pushing-in direction.

5. the engaging portion is a roller provided on a placement portion of the support base on which the tank is placed, The work machine according to claim 4 , wherein the first engaged portion and the second engaged portion are recesses formed in a bottom surface of the tank and into which the rollers fit.

6. the first engaged portion has a first restricting surface that abuts against the engaging portion at a front side in the pulling-out direction when the tank is at the installed position to restrict movement of the tank in the pushing-in direction, and a first guide surface that abuts against the engaging portion at a rear side in the pulling-out direction when the tank is at the installed position to restrict movement of the tank in the pulling-out direction and is formed in an inclined shape that transitions in the pushing-in direction as it moves downward from the top of the recess, The work machine described in claim 5, wherein the second engaged portion has a second regulating surface that abuts against the engaging portion on the front side in the pushing-in direction when the tank is in the pulled-out position, thereby regulating movement of the tank in the pulling-out direction, and a second guide surface that abuts against the engaging portion on the rear side in the pushing-in direction when the tank is in the pulled-out position, thereby regulating movement of the tank in the pushing-in direction, and is formed in an inclined shape that transitions in the pulling-out direction as it moves downward from the top of the recess.

7. The aircraft and A support platform mounted on the airframe; a tank supported on the support stand so as to be horizontally movable between an installation position and a withdrawal position withdrawn from the installation position; A fixing device capable of fixing the tank at the installation position and the withdrawal position; Equipped with The fixing device comprises: A stay member provided on the tank so as to be movable integrally with the tank; A first fixing portion and a second fixing portion provided on the aircraft body side and spaced apart in a moving direction of the tank; a first fixing device that fixes the stay member to the first fixing portion when the tank is in the installed position and that fixes the stay member to the second fixing portion when the tank is in the pulled-out position; Including work equipment.

8. The fixing device comprises: A third fixing portion and a fourth fixing portion provided on the aircraft body side and spaced apart in a moving direction of the tank; a second fixing device that fixes the stay member to the third fixing portion when the tank is in the installation position; a third fixing device that fixes the stay member to the fourth fixing portion when the tank is in the installation position, the fourth fixing portion is disposed on a side of the third fixing portion in a pulling-out direction from the installation position toward the pulling-out position, The work machine according to claim 7 , wherein the stay member is fixed to the fourth fixing portion by the third fixing device when the tank is in the pulled-out position.

9. A prime mover is mounted on the airframe, 9. The work machine according to claim 1, wherein the tank is a fuel tank that stores fuel for the prime mover.

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