Work machine

Abstract

To arrange a forced air-cooled heat exchanger in a state where heat exchange efficiency is increased without executing a complicated operation.SOLUTION: A work machine comprises a machine body, a bonnet configuring the exterior of the machine body, and a forced air-cooled heat exchanger for exchanging heat between air and a fluid. The bonnet has a vent hole, and the forced air-cooled heat exchanger is fitted to a position corresponding to the vent hole in the bonnet.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a work machine equipped with a forced air-cooling heat exchanger. [Background technology]

[0002] The rotating work machine disclosed in Patent Document 1 is equipped with a forced air-cooling heat exchanger having a fan and a shroud that guides cooling air generated by driving the fan. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-080709 Summary of the Invention [Problem to be solved by the invention]

[0004] In the rotating work machine of Patent Document 1, the shroud exhausts cooling air to the outside through an opening (vent) in the exterior cover (hood). However, if the seal between the shroud and the hood is insufficient, the amount of cooling air decreases, reducing heat exchange performance, or air heated by the heat exchanger may circulate inside the machine, causing adverse effects. For this reason, an airtight connection must be established between the periphery of the hood vent and the shroud, which requires complicated work such as adjusting the appropriate pressure on the sealing material to take into account individual differences in the machine. Another problem is that the sealing structure increases the number of parts.

[0005] Therefore, the present invention provides a work machine in which a forced air-cooling heat exchanger can be arranged with improved heat exchange efficiency without requiring complicated work. [Means for solving the problem]

[0006] The work machine comprises a body, a bonnet that forms the exterior of the body, and a forced air-cooled heat exchanger that exchanges heat between air and a fluid, the bonnet having an air vent, and the forced air-cooled heat exchanger being attached to a position on the bonnet corresponding to the air vent. [Effects of the Invention]

[0007] The working machine of the present invention can dispose the forced air-cooling heat exchanger in a state where heat exchange efficiency is improved without requiring any complicated work. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a work machine according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a side view of the work machine according to the embodiment. [Figure 3] FIG. 3 is a rear view of the work machine according to the embodiment. [Figure 4] FIG. 4 is a side view of the working machine according to the embodiment with the rear hood open. [Figure 5] FIG. 5 is an enlarged view of the rear hood of the work machine according to the embodiment in an open state. [Figure 6] FIG. 6 is an enlarged view showing a state in which the rear hood of the work machine according to the embodiment is open and the blower fan of the forced air-cooling heat exchanger is removed from the open rear hood. [Figure 7] FIG. 7 is an enlarged view showing a state in which the rear hood of the work machine according to the embodiment is open and the blower fan and heat exchanger of the forced air-cooling heat exchanger device are removed from the open rear hood. [Figure 8] FIG. 8 is an exploded perspective view of the forced air-cooling heat exchanger of the work machine according to the embodiment, and is a schematic perspective view including a part of the rear hood. [Figure 9] FIG. 9 is an exploded perspective view of a forced air-cooling heat exchanger for a work machine according to another embodiment of the present invention, and is a schematic perspective view including a part of the rear hood. [Figure 10] FIG. 10 is an exploded perspective view of a forced air-cooling heat exchanger for a work machine according to another embodiment of the present invention, and is a schematic perspective view including a part of the rear hood. [Figure 11] FIG. 11 is an exploded perspective view of a forced air-cooling heat exchanger for a work machine according to still another embodiment of the present invention, and is a schematic perspective view including a part of the rear hood. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a working machine according to an embodiment of the present invention will be described with reference to the drawings.

[0010] The work machine of this embodiment is a travelable backhoe. In the following description, the straight-ahead direction (forward and backward directions) of the work machine will be referred to as a first direction. The forward side of the work machine in the first direction will be referred to as the front side, and the backward side of the work machine in the first direction will be referred to as the rear side. Furthermore, the direction perpendicular to the first direction and the up-down direction will be referred to as a second direction, and the up-down direction will be referred to as a third direction.

[0011] As shown in FIGS. 1 to 3, the work machine 1 includes a machine body 2 and forced air-cooling heat exchangers 7 and 8 (see FIG. 5) that exchange heat between air and a fluid.

[0012] Specifically, the work machine 1 includes a body 2, a traveling device 3 that supports the body 2 so that it can travel, a work device 4 attached to the body 2, a hydraulic system that operates the traveling device 3 and the work device 4 and includes a hydraulic pump 5 that discharges hydraulic oil, and a prime mover 6 that drives the hydraulic pump 5. The work machine 1 includes a forced air-cooled oil cooler 7 that exchanges heat between the hydraulic oil, which is a fluid, and air (see FIG. 5 ). In this embodiment, the prime mover 6 is an electric motor. Accordingly, the work machine 1 includes a battery 9 that supplies power to the prime mover (electric motor) 6. In this embodiment, the battery 9 is a battery unit that includes a plurality of electrically connected battery cells. The electric motor 6 and the battery (battery unit) 9 are both water-cooled. In other words, the electric motor 6 and the battery (battery unit) 9 are cooled devices that are cooled by cooling water as a fluid. Accordingly, the work machine 1 is provided with a forced air-cooled radiator 8 as a forced air-cooled heat exchanger that exchanges heat between cooling water, which is a fluid, and air. Note that the prime mover 6 is not limited to an electric motor, and may be, for example, an engine, or a hybrid type that combines an engine and an electric motor.

[0013] The work machine 1 includes a pair of traveling devices 3, and the pair of traveling devices 3, 3 are arranged at an interval in the second direction. A crawler type traveling device or a tire type traveling device is adopted for each of the pair of traveling devices 3, 3. In this embodiment, a crawler type traveling device is adopted for the pair of traveling devices 3, 3.

[0014] As shown in FIGS. 2 and 3 , the vehicle body 2 includes a traveling frame 10 supported by a pair of traveling devices 3, 3, a revolving frame 11 that is revolvable on the traveling frame 10 around an axis extending in the third direction, a driver's seat DS disposed on the revolving frame 11, and a driver's seat protection mechanism 12 that covers and protects the driver's seat DS. The vehicle body 2 further includes a hood 13 that constitutes the exterior of the vehicle body 2. In this embodiment, the hood 13 faces at least the upper and rear sides of the equipment disposed on the revolving frame 11 (a base plate 110 described later). In this embodiment, the vehicle body 2 includes a support frame 14 that supports at least a cover portion (rear hood) 133 (described later) of the hood 13 (FIG. 2). In this embodiment, the support frame 14 supports the entire hood 13 (multiple components that form the hood 13 (a rear hood 133, an upper hood 134, and side hoods 135, 135 described later)).

[0015] As shown in FIG. 2, the swivel frame 11 has a base plate 110 and an apparatus connecting portion 111 to which a shovel apparatus 4a (described later) serving as a working apparatus 4 is connected, the apparatus connecting portion 111 being connected to one end of the base plate 110 in the first direction.

[0016] The swivel bearing BR, which is fixed to the upper surface of the traveling frame 10, is fixed to the lower surface of the base plate 110. This allows the base plate 110 (swivel frame 11) to rotate relative to the traveling frame 10 around an axis (the rotation center of the swivel bearing BR) extending in the third direction.

[0017] In a region FA on the front side in the first direction of the base plate 110 (hereinafter referred to as the front region), a step, which is a floor plate of the driver's cab DR (described later), is arranged. The step is arranged above the base plate 110 with a gap therebetween. In a region BA on the rear side in the first direction of the base plate 110 (hereinafter referred to as the rear region), devices such as a hydraulic pump 5, a prime mover 6, and a battery 9 are arranged. Also, a support frame 14 is arranged in the rear region BA.

[0018] The driver's seat protection mechanism 12 of this embodiment is a so-called cabin that covers the entire driver's seat DS and protects the operator seated in the driver's seat DS (defines the driver's compartment DR). The driver's seat protection mechanism 12 may also be a so-called canopy that has a roof that covers the head of the operator seated in the driver's seat DS and pillars that support the roof. The work machine 1 may also be configured without the driver's seat protection mechanism 12.

[0019] 1, the work machine 1 is equipped with, as work devices 4, a shovel device 4a attached to a swivel frame 11 (device connection portion 111) and a dozer device 4b attached to a traveling frame 10. The shovel device 4a and the dozer device 4b are both hydraulic devices, and include hydraulic cylinders 40a, 41a, 40b that expand and contract by the supply and discharge of hydraulic oil discharged from a hydraulic pump 5, thereby performing their respective functions.

[0020] As shown in FIG. 3, the hood 13 has vents 130, 131, and 132 that connect the inside and outside of the hood 13.

[0021] In this embodiment, the hood 13 includes an openable and closable cover portion 133. The cover portion 133 has mounting portions 136 (see FIG. 4) for mounting the forced-air-cooling heat exchangers 7 and 8. In this embodiment, the cover portion 133 is a rear hood 133 that is disposed behind the equipment (e.g., the prime mover 6, the battery 9, etc.) disposed on the base plate 110, and that has air vents 130 and 131.

[0022] More specifically, the hood 13 includes an upper hood 134 disposed above the equipment, a pair of side hoods 135, 135 disposed on both sides of the equipment in the second direction and having vent holes 132 communicating between the inside and outside, and a rear hood 133 disposed behind the equipment and having vent holes 130, 131 communicating between the inside and outside. The hood 13 defines an equipment housing chamber MR that houses equipment such as the prime mover 6, a battery (battery unit) 9, etc.

[0023] The work machine 1 of this embodiment takes in outside air as cooling air into the equipment housing chamber MR (around the battery (battery unit) 9) through the vents 132 of the pair of side hoods 135, 135, and exhausts the air in the equipment housing chamber MR (around the battery (battery unit) 9) to the outside through the vents 130, 131 of the rear hood 133. That is, in this embodiment, The vents 132 in the pair of side hoods 135, 135 are intake ports that take in outside air into the equipment housing room MR, and the vents 130, 131 in the rear hood 133 are exhaust ports that exhaust air from the equipment housing room MR to the outside. In this embodiment, the intake of outside air into the equipment housing room MR and the exhaust of air from the equipment housing room MR to the outside are performed by forced air blowing (forced ventilation) driven by fans (blower devices) 71, 81, which will be described later, of the forced air-cooled heat exchange devices 7, 8 (forced air-cooled oil cooler 7, forced air-cooled radiator 8). In addition, assuming forced air blowing by fans 71, 81 of the forced air-cooled heat exchange devices 7, 8 (forced air-cooled oil cooler 7, forced air-cooled radiator 8), the configuration may be such that external air is taken in as cooling air into the equipment housing chamber MR (around the battery (battery unit) 9) through air vents 130, 131 in the rear hood 133, and the air in the equipment housing chamber MR (around the battery (battery unit) 9) is discharged to the outside through air vents 132 in the side hoods 135, 135, etc.

[0024] In this embodiment, a mesh (net material) is arranged in the vents (intake ports) 132 of the pair of side hoods 135, 135 and the vents (exhaust ports) 130, 131 of the rear hood 133, allowing ventilation while preventing access to the equipment housing room MR from the outside (entry of hands (fingers) or objects). Note that, instead of the mesh (net material), louvers may be arranged in the vents 130, 131, 132.

[0025] As shown in Figures 2 and 4, the rear hood 133 can be opened and closed. Specifically, as shown in Figures 4 and 5, the aircraft body 2 includes a hinge 15 that connects the support frame 14 and the rear hood (cover portion) 133. As shown in Figure 5, the hinge 15 has a support shaft 150 that extends in the third direction. The hinge 15 connects one end of the rear hood 133 in the second direction to the support frame 14. Accordingly, as shown in Figure 3, the rear hood 133 has a notch (handle) 140 for opening and closing on the other end side in the second direction.

[0026] The rear hood 133 can be opened and closed by rotating (turning) it about a support shaft 150 of the hinge 15 at one end in the width direction by pulling outward (rearward) a notch (handle) 140 at the other end in the width direction. The forced air-cooling heat exchangers 7, 8 perform forced air cooling when the rear hood (cover) 133 is closed and stop forced air cooling when the rear hood (cover) 133 is open. That is, the work machine 1 is provided with an open / close detection device that detects whether the rear hood (cover) 133 is open or closed. The open / close detection device is electrically connected to a control device disposed in the machine body 2, and the control device switches the fans 71, 81 of the forced air-cooling heat exchangers 7, 8 ON / OFF based on the detection result of the open / close detection switch. This prevents the operator from approaching the operating fans 71, 81, ensuring the operator's safety.

[0027] In this embodiment, the notch (handle) 140 is a key mechanism for locking the rear hood 133, and is linked to a key mechanism that can be switched between a locked state and an unlocked state in response to instructions from a control device disposed in the machine body 2. In the work machine 1 of this embodiment, the key mechanism is switched between a locked state and an unlocked state under the control of the control device depending on the driving status of the fans 71, 81 of the forced air-cooling heat exchangers 7, 8. As a result, even if the operator operates the notch (handle) 140 while the fans 71, 81 are driving, the rear hood 133 is maintained in a closed state (cannot be opened). In this way, the work machine 1 has a dual interlock function for opening and closing the rear hood 133, but the interlock is not essential, and only one of the above functions or neither may be provided.

[0028] As shown in FIGS. 5 to 8, the forced air-cooled heat exchangers 7 and 8 are fixed to the inner surface of the hood 13 at positions corresponding to the vents 130 and 131. The forced air-cooled heat exchangers 70 and 80 include heat exchange sections 70a and 80a that include flow paths for circulating a fluid, and a predetermined and fans 71 and 81 including propellers 71b and 81b that are driven to rotate around the axis of the fan.

[0029] In the forced air-cooling heat exchange devices 7, 8, the heat exchangers 70, 80 and the fans 71, 81 are arranged so that the heat exchange sections 70a, 80a and the propellers 71b, 81b face each other, as shown in FIG.

[0030] The heat exchangers 70, 80 are arranged (attached) to the inner surface of the rear hood 133 with the heat exchange sections 70a, 80a facing the vents 130, 131, and the fans 71, 81 are arranged facing the surface of the heat exchangers 70, 80 opposite to the surface facing the vents 130, 131. In this embodiment, the fans 71, 81 suck air from within the equipment housing room MR, pass it through the heat exchange sections 70a, 80a of the heat exchangers 70, 80, and discharge it from the vents 130, 131.

[0031] In this embodiment, the rear bonnet 133 has a frame portion 136 surrounding the ventilation openings 130, 131 as an attachment portion 136 for attaching the forced air-cooled heat exchanger 7, 8, and has a frame portion 136 on the inner surface facing the equipment side (the equipment housing chamber MR side) into which the forced air-cooled heat exchanger 7, 8 can be fitted.

[0032] The work machine 1 of this embodiment is equipped with a plurality of forced air-cooled heat exchangers 7, 8. Specifically, the work machine 1 is equipped with a forced air-cooled oil cooler 7 that exchanges heat between hydraulic oil (fluid) and air (cooling air) as the forced air-cooled heat exchangers 7, 8, and a forced air-cooled radiator 8 that exchanges heat between cooling water (fluid) and air (cooling air). That is, the work machine 1 is equipped with the forced air-cooled oil cooler 7 that cools hydraulic oil circulating through a hydraulic system and the forced air-cooled radiator 8 that cools coolant (cooling water) that cools the prime mover 6 and the battery 9 as the forced air-cooled heat exchangers 7, 8.

[0033] 7 and 8, the rear hood 133 has, as vents, a first vent 130 corresponding to the forced air-cooled oil cooler 7 and a second vent 131 corresponding to the forced air-cooled radiator 8. That is, the rear hood (cover portion) 133 has the first vent 130 through which the cooling air of the forced air-cooled oil cooler 7 circulates, and the second vent 131 through which the cooling air of the forced air-cooled radiator 8 circulates.

[0034] The first vent 130 and the second vent 131 of the rear hood 133 are arranged side by side in a direction perpendicular to the third direction (when the equipment housing chamber MR is closed, they are arranged side by side in the second direction). Accordingly, the forced air-cooled oil cooler 7 and the forced air-cooled radiator 8 are arranged side by side in a direction perpendicular to the third direction (when the equipment housing chamber MR is closed, they are arranged side by side in the second direction). The forced air-cooled oil cooler 7 and the forced air-cooled radiator 8 are arranged side by side in a direction perpendicular to the extension direction of the support shaft 150 of the hinge 15.

[0035] 5, 6, and 8, the forced-air-cooling oil cooler 7 includes a heat exchanger 70 including a heat exchanger unit 70a that includes a flow path for circulating hydraulic oil, which is a fluid, and an oil cooler fan (electric fan) 71 including a propeller 71b and an electric motor 71d that rotates and drives the propeller 71b. In the forced-air-cooling oil cooler 7, the oil cooler fan 71 is disposed closer to the equipment housing chamber MR than the heat exchanger 70, with the propeller 71b facing the heat exchanger unit 70a. The heat exchanger 70 is disposed with the heat exchanger unit 70a facing (corresponding to) the first air vent (exhaust port) 130.

[0036] In this embodiment, as shown in Fig. 6, a corrugated fin type heat exchanger is used for the heat exchanger 70 of the forced air-cooled oil cooler 7. That is, the heat exchanger 70 of the forced air-cooled oil cooler 7 has a plurality of flow path forming portions that form flow paths for circulating the hydraulic oil therein. 70b..., each of which is flattened in the radial direction and arranged at intervals in the flattening direction, and corrugated fins 70c arranged between adjacent flow path forming portions 70b, 70b and connected to the flow path forming portions 70b, 70b on both sides.

[0037] The heat exchanger 70 of the forced air-cooled oil cooler 7 has a primary flow path 70d communicating with one end of each of the plurality of flow path forming portions 70b, 70b, and a secondary flow path 70e communicating with the other end of each of the plurality of flow path forming portions 70b, 70b. Accordingly, a primary pipe (pipe, conduit) Pa1, which is a flow path for circulating hydraulic oil (hydraulic oil whose temperature has increased due to work) from a hydraulic actuator (e.g., hydraulic cylinders 40a, 41a, 40b), is connected to the primary flow path 70d, and a secondary pipe (pipe, conduit) Pa2, which is a flow path for returning the heat-exchanged hydraulic oil to a hydraulic oil tank, is connected to the secondary flow path 70e.

[0038] The primary pipe Pa1 and the secondary pipe Pa2 connected to the heat exchanger 70 of the forced air-cooled oil cooler 7 are arranged along the inner surface of the rear hood 133. The primary pipe Pa1 and the secondary pipe Pa2 extend from the other end side in the second direction of the rear hood 133 to one end side (the hinge 15 side), and then extend through the vicinity of the hinge 15 into the equipment housing room MR. In other words, the primary pipe Pa1 and the secondary pipe Pa2 are arranged straddling the hinge 15. At least the portions of the primary pipe Pa1 and the secondary pipe Pa2 corresponding to the hinge 15 are made of flexible members such as hydraulic hoses, and allow the rear hood 133 to be opened and closed (rotate around the support shaft 150 of the hinge 15).

[0039] In the heat exchanger 70 of the forced-air-cooled oil cooler 7, the heat exchange section 70a is a section in which the multiple flow path forming sections 70b... and the corrugated fins 70c are arranged. In the heat exchange section 70a, air can pass between adjacent flow path forming sections 70b, 70b in a direction perpendicular to the arrangement direction of the multiple flow path forming sections 70b..., and heat exchange occurs between the hydraulic oil flowing within the flow path forming sections 70b and the air passing between the flow path forming sections 70b, 70b (the hydraulic oil is cooled). The heat exchanger 70 of the forced-air-cooled oil cooler 7 is arranged so that the direction perpendicular to the arrangement direction of the multiple flow path forming sections 70b... is aligned with the opening direction of the first air vent 130.

[0040] The oil cooler fan 71 of the forced air-cooled oil cooler 7 is an axial flow fan. Specifically, as shown in Figures 5 and 8, the oil cooler fan 71 of the forced air-cooled oil cooler 7 includes an annular casing 71c, an electric motor 71d supported by the casing 71c, and a propeller 71b disposed within the casing 71c and connected to an output shaft of the electric motor 71d.

[0041] In the oil cooler fan 71 of the forced air-cooled oil cooler 7, a wiring Ca1 that supplies power from the battery 9 is connected to the electric motor 71d. The wiring Ca1 extends from the other end side of the rear hood 133 in the second direction to one end side (the hinge 15 side), and then extends into the equipment housing room MR, passing near the hinge 15. The wiring Ca1 is flexible and allows the rear hood 133 to be opened and closed (rotated about the support shaft 150 of the hinge 15).

[0042] In the oil cooler fan 71 of the forced air-cooled oil cooler 7, the air blowing section 71a (the section that performs the air blowing function) is the rotation area of the propeller 71b, i.e., the opening area of the casing 71c. Accordingly, the oil cooler fan 71 is positioned so that the air blowing section 71a (propeller 71b) faces the heat exchange section 70a of the heat exchanger 70, and sends the air to be blown between the flow path forming sections 70b, 70b.

[0043] As shown in FIGS. 5, 6 and 8, the forced air-cooled radiator 8 includes a heat exchanger 80 including a heat exchange section 80a including a flow path for circulating a cooling water fluid, a propeller 81b and a and a radiator fan (electric fan) 81 including an electric motor 81d that rotates and drives a propeller 81b. In the forced air-cooled radiator 8, the radiator fan 81 is disposed closer to the equipment housing chamber MR than the heat exchanger 80, with the propeller 81b facing the heat exchanger section 80a. The heat exchanger 80 is disposed with the heat exchanger section 80a facing (corresponding to) the second ventilation port (exhaust port) 131.

[0044] 6, a plate-fin type heat exchanger is used for the heat exchanger 80 of the forced-air-cooled radiator 8. That is, the heat exchanger 80 of the forced-air-cooled radiator 8 has a plurality of flow path forming portions 80b that form flow paths through which the coolant flows, the plurality of flow path forming portions 80b each extending in the third direction and aligned at intervals in a direction perpendicular to the third direction, and a plurality of fins 80c that are arranged across the plurality of flow path forming portions 80b and aligned in the third direction.

[0045] The heat exchanger 80 of the forced air-cooled radiator 8 has an upper tank 80d that communicates with the upper end of each of the plurality of flow path forming portions 80b... and a lower tank 80e that communicates with the lower end of each of the plurality of flow path forming portions 80b.... Accordingly, a primary pipe (pipe) Pb1 that is a flow path for circulating the coolant (heated coolant) that has passed through the engine 6 and the battery 9 is connected to the upper tank 80d, and a secondary pipe (pipe) Pb2 that is a flow path for returning the heat-exchanged coolant to the engine 6 and the battery 9 is connected to the lower tank 80e.

[0046] The primary pipe Pb1 and the secondary pipe Pb2 connected to the heat exchanger 80 of the forced-air-cooled radiator 8 are arranged along the inner surface of the rear hood 133. The primary pipe Pb1 and the secondary pipe Pb2 extend from the other end side in the second direction of the rear hood 133 to one end side (the hinge 15 side), and then extend through the vicinity of the hinge 15 into the equipment housing room MR. In other words, the primary pipe Pb1 and the secondary pipe Pb2 are arranged straddling the hinge 15. At least the portions of the primary pipe Pb1 and the secondary pipe Pb2 corresponding to the hinge 15 are made of flexible members such as hoses, and allow the rear hood 133 to open and close (rotate around the support shaft 150 of the hinge 15).

[0047] In the heat exchanger 80 of the forced-air-cooled radiator 8, the heat exchange section 80a is a section in which a plurality of flow path forming sections 80b and a plurality of fins 80c are arranged. In the heat exchange section 80a, air can pass between adjacent flow path forming sections 80b, 80b in a direction perpendicular to the arrangement direction of the plurality of flow path forming sections 80b, 80b, and heat exchange occurs between the coolant flowing within the flow path forming sections 80b and the air passing between the flow path forming sections 80b, 80b (the coolant is cooled). The heat exchanger 80 of the forced-air-cooled radiator 8 is arranged so that the direction perpendicular to the arrangement direction of the plurality of flow path forming sections 80b, 80b is aligned with the opening direction of the second air vent 131.

[0048] The radiator fan 81 of the forced-air-cooling radiator 8 is an axial fan. Specifically, as shown in Figures 5 and 8, the radiator fan 81 of the forced-air-cooling radiator 8 includes an annular casing 81c, an electric motor 81d supported by the casing 81c, and a propeller 81b disposed within the casing 81c and connected to the output shaft of the electric motor 81d.

[0049] A wiring Ca2 that supplies power from the battery 9 is connected to the electric motor 81d of the radiator fan 81 of the forced-air-cooling radiator 8. The wiring Ca2 extends from the other end side of the rear hood 133 in the second direction to one end side (the hinge 15 side), and then extends into the equipment housing room MR, passing near the hinge 15. The wiring Ca2 is flexible and allows the rear hood 133 to be opened and closed (rotated around the support shaft 150 of the hinge 15).

[0050] In the radiator fan 81 of the forced air-cooling type radiator 8, a blower 81a (blower function The area where the rotation of the propeller 81b is exerted is the area where the casing 81c is open. Accordingly, the radiator fan 81 is oriented such that the blower 81a (propeller 81b) faces the heat exchanger 80a of the heat exchanger 80, and sends the air between the flow path forming portions 80b, 80b.

[0051] 8, in the work machine 1 of this embodiment, the forced air-cooled oil cooler 7 and the forced air-cooled radiator 8 are attached to the inner surface of the rear hood 133 with their respective heat exchangers 70, 80 integrated together and their respective fans 71, 81 integrated together. In addition, the fans 71, 81 are each individually controlled by a control device disposed in the machine body 2.

[0052] The rear hood 133 has a frame 136 that surrounds the vents 130, 131 and that can fit the forced air-cooling heat exchangers 7, 8 on the inner surface facing the equipment side (equipment housing chamber MR side) on the base plate 110.

[0053] In this embodiment, the frame portion 136 of the rear hood 133 is formed so as to surround both the first vent port 130 and the second vent port 131. The frame portion 136 is formed in a rectangular shape when viewed from the opening direction of the first vent port 130 and the second vent port 131. That is, the frame portion 136 includes a pair of horizontal bars 136a, 136a arranged at intervals in the third direction, the pair of horizontal bars 136a, 136a extending straight in a direction perpendicular to the third direction, and a pair of vertical bars 136b, 136b arranged at intervals in the direction perpendicular to the third direction, the pair of vertical bars 136b extending straight in the direction perpendicular to the third direction, and having upper and lower ends connected to the pair of horizontal bars 136a, 136a. The first ventilation port 130 and the second ventilation port 131 are located between a pair of horizontal bars 136a, 136a and between a pair of vertical bars 136b, 136b.

[0054] Each of the pair of vertical bars 136b, 136b has cutouts 137... formed therein for arranging the primary pipes Pa1, Pb1 and the secondary pipes Pa2, Pb2 connected to the heat exchangers 70, 80. Each of the pair of vertical bars 136b, 136b also has a through hole H1 formed therein for inserting a male screw member for fixing at least one of a first mounting member 16 and a second mounting member 17, which will be described later.

[0055] Based on this premise, the work machine 1 is provided with a first mounting member 16 for mounting the heat exchangers 70, 80 of the forced air-cooled oil cooler 7 and the forced air-cooled radiator 8, the first mounting member 16 being fitted into the frame portion 136, and a second mounting member 17 for mounting the fans 71, 81 of the forced air-cooled oil cooler 7 and the forced air-cooled radiator 8, the second mounting member 17 being fitted into the frame portion 136.

[0056] The first mounting member 16 has a main body 160 that can be fitted into the frame 136. The main body 160 is a plate material that is rectangular in plan view. That is, the main body 160 of the first mounting member 16 is a plate material that is approximately the same shape and size as the rectangular area surrounded by the frame 136, and is configured to be able to be fitted into the frame 136 with its face facing the inner surface of the rear hood 133.

[0057] The main body 160 of the first mounting member 16 has two openings 161, 162 formed in the area facing the heat exchange sections 70a, 80a of the heat exchangers 70, 80, which correspond to the heat exchange sections 70a, 80a and also correspond to the ventilation openings (first ventilation opening 130, second ventilation opening 131) of the rear hood 133.

[0058] The two openings 161, 162 are arranged side by side in a direction perpendicular to the third direction. Accordingly, the first mounting member 16 has a partition portion 163 provided on one surface of the main body portion 160, the partition portion 163 extending in the third direction between the two openings 161, 162. In other words, the first mounting member 16 has the partition portion 163 that separates an area where the heat exchanger 70 of the forced air-cooled oil cooler 7 is disposed from an area where the heat exchanger 80 of the forced air-cooled radiator 8 is disposed.

[0059] Accordingly, the heat exchangers 70, 80 of the forced air-cooled oil cooler 7 and the forced air-cooled radiator 8 are fixed (screw-fixed in this embodiment) to the first mounting member 16 with their heat exchange portions 70a, 80a facing (corresponding to) the openings 161, 162. The first mounting member 16 is fitted into the frame portion 136 and fixed to the rear hood 133 with screws.

[0060] Therefore, by simply fitting the first mounting member 16 (main body portion 160) to which the heat exchangers 70, 80 of the forced air-cooled oil cooler 7 and the forced air-cooled radiator 8 are attached into the frame portion 136 and screwing it in place, the heat exchangers 70, 80 of the forced air-cooled oil cooler 7 and the forced air-cooled radiator 8 are fixed to the rear bonnet 133 with their heat exchange portions 70a, 80a corresponding to the air vents 130, 131 (first air vents 130, 131) of the rear bonnet 133.

[0061] As described above, the pair of vertical bars 136b, 136b of the frame 136 are each formed with a notch 137, and the primary pipes Pa1, Pb1 and secondary pipes Pa2, Pb2 connected to the heat exchangers 70, 80 fit into the notch 137. Therefore, even when the first mounting member 16 (the heat exchangers 70, 80 of the forced air-cooled oil cooler 7 and the forced air-cooled radiator 8) is disposed inside the frame 136, the primary pipes Pa1, Pb1 and secondary pipes Pa2, Pb2 do not interfere with the frame 136 (vertical bars 136b). Therefore, the heat exchangers 70, 80 can be attached with the primary pipes Pa1, Pb1 and secondary pipes Pa2, Pb2 connected to the heat exchangers 70, 80.

[0062] The second mounting member 17 has a main body portion 170 that can be fitted into the frame portion 136. In this embodiment, the second mounting member 17 has a pair of pieces 171, 171 that are connected to both ends of the main body portion 170 in a direction perpendicular to the third direction and extend at a substantially right angle to the main body portion 170.

[0063] The main body 170 of the second mounting member 17 is a plate material having a rectangular shape in a plan view. That is, the main body 170 of the second mounting member 17 is a plate material having approximately the same shape and size as the rectangular region surrounded by the frame portion 136, and is configured so as to be fitted into the frame portion 136 while facing the inner surface of the rear hood 133. The main body 170 of the second mounting member 17 has two openings 172, 173 formed in an area facing the heat exchange portions 70a, 80a of the heat exchangers 70, 80. The two openings 172, 173 correspond to the heat exchange portions 70a, 80a and also correspond to the vents (first vent port 130, second vent port 131) of the rear hood 133. The two openings 172, 173 are arranged side by side in a direction perpendicular to the third direction.

[0064] In the second mounting member 17 of this embodiment, the fans 71, 81 are attached to one surface of the main body 170. The fans 71, 81 of the forced air-cooled oil cooler 7 and the forced air-cooled radiator 8 are fixed (fixed with screws in this embodiment) to the second mounting member 17 with their respective blower sections 71 a, 81 a facing (corresponding to) the openings 172, 173.

[0065] When the second mounting member 17 is fitted into the frame portion 136, the pair of pieces 171, 171 are aligned along the inner surfaces of the pair of vertical bars 136b, 136b. Note that when the second mounting member 17 is fitted into the frame portion 136, the pair of pieces 171, 171 may be aligned along the outer surfaces of the pair of vertical bars 136b, 136b. Accordingly, each of the pair of pieces 171, 171 The piece 171 is provided with a notch 174 and a hole H2 corresponding to the notch 137 and the through hole H1 of the pair of vertical bars 136b. In this embodiment, the piece 171 fits along the inner surface of the vertical bars 136b, and therefore the hole H2 formed in the piece 171 is a screw hole (so-called tap hole) into which a male screw member inserted into the through hole H1 of the vertical bar 136b is screwed, but when the piece 171 fits along the outer surface of the vertical bars 136b, the through hole H1 of the vertical bar 136b is made into a screw hole, and the hole H2 of the piece 171 is made into a through hole into which a male screw member is inserted.

[0066] The cutout portions 174 of the pair of pieces 171, 171 are open in the opposite direction to the cutout portions 137 of the vertical beam 136b. The cutout portions 174 of the pieces 171 and the cutout portions 137 of the vertical beam 136b are combined together to surround the primary pipes Pa1, Pb1 and the secondary pipes Pa2, Pb2.

[0067] Therefore, the forced air-cooled oil cooler 7 and the forced air-cooled radiator 8 can be fixed to the rear bonnet 133 by simply screwing the second mounting member 17 (main body 170) to which the fans 71, 81 are attached into the frame portion 136, with their respective blower sections 71a, 81a corresponding to the heat exchange sections 70a, 80a of the heat exchangers 70, 80 and the vents 130, 131 (second vents 130, 131) of the rear bonnet 133. Furthermore, when the forced air-cooled oil cooler 7 and the forced air-cooled radiator 8 are fitted into the frame portion 136, the frame portion 136 surrounds the forced air-cooled oil cooler 7 and the forced air-cooled radiator 8, thereby making the space between the forced air-cooled heat exchange devices 7, 8 (the forced air-cooled oil cooler 7 and the forced air-cooled radiator 8) and the ventilation holes 130, 131 (the first ventilation hole 130, the second ventilation hole 131) airtight.

[0068] In this embodiment, because the first mounting member 16 has a partition portion 163, when the second mounting member 17 is fitted into the frame portion 136, the partition portion 163 of the first mounting member 16 fixed inside the frame portion 136 comes into contact with the main body portion 170 of the second mounting member 17. As a result, the air flow path of the oil cooler fan 71 of the forced air-cooled oil cooler 7 and the air flow path of the radiator fan 81 of the forced air-cooled radiator 8 are separated by the partition portion 163, and the air flow performance of each fan 71, 81 is effectively utilized for heat exchange by the target heat exchangers 70, 80.

[0069] As described above, the pair of vertical bars 136b, 136b of the frame 136 each have a cutout 137 formed therein, so that the primary pipes Pa1, Pb1 and secondary pipes Pa2, Pb2 connected to the heat exchangers 70, 80 fit into the cutout 137. However, when the second mounting member 17 is fitted to the frame 136, the primary pipes Pa1, Pb1 and secondary pipes Pa2, Pb2 fit into the cutout 174 of the piece 171, so that the primary pipes Pa1, Pb1 and secondary pipes Pa2, Pb2 do not interfere with the second mounting member 17 (piece 171). Therefore, the second mounting member 17 (fans 71, 81) can be attached with the primary pipes Pa1, Pb1 and secondary pipes Pa2, Pb2 connected to the heat exchangers 70, 80.

[0070] In this way, by attaching the heat exchangers 70, 80 and fans 71, 81 of the forced air-cooled heat exchange devices 7, 8 to the rear hood 133 based on the vents 130, 131, there is no need for members (for example, ducts or shrouds) connecting the forced air-cooled heat exchange devices 7, 8 and the vents 130, 131, and these can be easily arranged and positioned. Furthermore, by arranging the heat exchangers 70, 80, fans 71, 81, and vents 130, 131 in close proximity, the forced air-cooled heat exchange devices 7, 8 and the vents 130, 131 are airtight, preventing air from leaking into the hood 13 when the fans 71, 81 are blowing air, and the taken-in air can be effectively used for heat exchange.

[0071] The above-mentioned embodiment (preferred embodiment of the present invention) is as described above, and the above-mentioned embodiment includes many inventions including the present invention, and in particular provides the inventions described in the following items.

[0072] (Item 1) The work machine (1) comprises a body (2), a bonnet (13) that forms the exterior of the body (2), and forced air-cooled heat exchangers (7, 8) that exchange heat between air and a fluid, the bonnet (13) having an air vent, and the forced air-cooled heat exchangers (7, 8) being attached at positions corresponding to the air vents (130, 131) in the bonnet (13).

[0073] According to the work machine 1 of item 1, the forced air-cooled heat exchangers 7, 8 are attached to the inner surface of the hood 13 based on the vent holes 130, 131 of the hood 13. This reduces the distance between the hood 13 and the forced air-cooled heat exchangers 7, 8, increasing the airtightness. Therefore, the work machine 1 of item 1 can position the forced air-cooled heat exchangers 7, 8 with improved heat exchange efficiency without requiring complicated work.

[0074] (Item 2) Item 1: The work machine (1) according to item 1, wherein the hood (13) includes a cover portion (133) that has vents (130, 131) and that can be opened and closed, and the forced air-cooled heat exchange devices (7, 8) are attached to the inner surface of the cover portion (133).

[0075] According to the work machine 1 of item 2, it is easy to access the inside of the hood 13 and the inner surface of the rear hood 133, and various tasks such as maintenance and assembly can be easily and properly performed.

[0076] (Item 3) The cover portion 133 has an attachment portion 136 for attaching the forced air-cooled heat exchanger 7, 8, and the attachment portion 136 is a frame portion that surrounds the ventilation openings 130, 131 and into which the forced air-cooled heat exchanger 7, 8 can be fitted.

[0077] According to the work machine 1 of item 3, the forced air-cooled heat exchanger 7, 8 can be attached to the hood 13 (cover portion 133) while being positioned relative to the ventilation openings 130, 131 simply by fitting the forced air-cooled heat exchanger 7, 8 into the mounting portion (frame portion) 136.

[0078] (Item 4) The working machine according to item 3, wherein the frame portion 136 provides airtightness between the forced air-cooling type heat exchange devices 7, 8 and the ventilation openings 130, 131.

[0079] According to the work machine 1 of item 4, the air is prevented from escaping from the range (area) surrounded by the frame portion 136, and the air is efficiently used for heat exchange.

[0080] (Item 5) The work machine 1 described in any one of items 2 to 4, wherein the machine body 2 includes a support frame 14 that supports the cover portion 133, and a hinge 15 that connects the support frame 14 and the cover portion 133 so that the support frame 14 and the cover portion 133 are rotatable around a support shaft 150, and is provided with flow paths Pa1, Pb1, Pa2, Pb2 that are connected to equipment provided on the machine body 2 and to forced air-cooled heat exchangers 7, 8 attached to the inner surface of the cover portion 133 and through which a fluid flows, and the flow paths Pa1, Pb1, Pa2, Pb2 are provided so that the cover portion 133 can be rotated around the support shaft 150 while remaining connected to the equipment and the forced air-cooled heat exchangers 7, 8.

[0081] According to the work machine 1 of item 5, the cover portion 133 can be easily opened and closed. Furthermore, even if the openable cover portion 133 is attached to the forced air-cooling type heat exchangers 7 and 8, fluid can be supplied to the forced air-cooling type heat exchangers 7 and 8 through the pipes Pa1, Pb1, Pa2, and Pb2. Cut.

[0082] (Item 6) The forced air-cooled heat exchange device 7, 8 has a fan 71, 81 and a heat exchanger 70, 80 including a heat exchange section 70a, 80a that is arranged in a position opposite the fan 71, 81 and exchanges heat between the cooling air generated by driving the fan 71, 81 and a fluid, and the heat exchange section 70a, 80a or the fan 71, 81 is opposite the ventilation opening 130, 131, the work machine 1 described in any one of items 1 to 5.

[0083] According to the work machine 1 of item 6, the cooling air generated by driving the fans 71, 81 can be passed through the heat exchanger 70a and the vents 130, 131.

[0084] (Item 7) The work machine 1 according to any one of items 1 to 6, which is equipped with a work device 4 (4a, 4b) attached to a machine body 2 and operated by hydraulic oil, which is a fluid, and the forced air-cooled heat exchange devices 7, 8 are forced air-cooled oil coolers that exchange heat between the hydraulic oil and air.

[0085] According to the work machine 1 of item 7, the hydraulic oil that operates the work device 4 (4a, 4b) is appropriately cooled by the forced air-cooled oil cooler 7.

[0086] (Item 8) The work machine 1 according to any one of items 1 to 6, which includes cooled devices 6, 9 that are cooled by cooling water as a fluid, and the forced air-cooling heat exchanger 8 is a forced air-cooling radiator that exchanges heat between the cooling water and air.

[0087] According to the work machine 1 of item 8, the cooling water that cools the cooled devices 6 and 9 is appropriately cooled by the forced air-cooled radiator 8.

[0088] (Item 9) The work machine 1 according to any one of items 1 to 6, which is attached to a machine body and includes a work device 4 (4a, 4b) that is operated by hydraulic oil as a fluid, and a cooled device 6 that is cooled by cooling water as a fluid, and includes, as forced air-cooled heat exchangers 7, 8, a forced air-cooled oil cooler 7 that exchanges heat between the hydraulic oil and air, and a forced air-cooled radiator 8 that exchanges heat between the cooling water and air.

[0089] According to the work implement 1 of item 9, the forced air-cooled oil cooler 7 and the forced air-cooled radiator 8 as the forced air-cooled heat exchangers 7, 8 are attached together to the hood 13, facilitating their maintenance, etc. By cooling the hydraulic oil that operates the work implements 4 (4a, 4b) with the forced air-cooled oil cooler 7 and cooling (heat exchanging) the cooling water that cools the cooled device 6 with the forced air-cooled radiator 8, the hydraulic oil and the cooling water can each be cooled efficiently.

[0090] (Item 10) The work machine 1 according to item 9, wherein the forced air-cooled oil cooler 7 has an oil cooler fan 71 that generates cooling air, and the forced air-cooled radiator 8 has a radiator fan 81 that generates cooling air.

[0091] According to the work machine 1 of item 10, the forced air-cooled oil cooler 7 and the forced air-cooled radiator 8 each generate cooling air using separate and independent fans 71, 81, allowing for efficient heat exchange in each.

[0092] (Item 11) The work implement 1 described in item 10, wherein the hood 13 has, as the vents 130, 131, a first vent 130 through which cooling air from the forced air-cooled oil cooler 7 circulates and a second vent 131 through which cooling air from the forced air-cooled radiator 8 circulates.

[0093] According to the work machine 1 of item 11, the cooling air from the forced air-cooled oil cooler 7 and the cooling air from the forced air-cooled radiator 8 can be ventilated through independent paths (dedicated paths). This prevents the cooling air from either the forced air-cooled oil cooler 7 or the forced air-cooled radiator 8 from affecting the heat exchange in the other one.

[0094] (Item 12) Item 11: The work machine 1, wherein the hood 13 has vents 130, 131 and includes a cover portion 133 that can be opened and closed, the machine body 2 includes a support frame 14 that supports the cover portion 133, and a hinge 25 that connects the support frame 14 and the cover portion 133 rotatably around a support shaft 150, and the forced air-cooled oil cooler 7 and the forced air-cooled radiator 8 are arranged side by side on the inner surface of the cover portion 133 along a direction perpendicular to the extension direction of the support shaft 250.

[0095] According to the work implement 1 of item 12, by rotating (opening) the cover part 133 around the support shaft 150 of the hinge 15, it is possible to access the inside of the hood 13 and also to access the two forced air-cooled heat exchangers (the forced air-cooled oil cooler 7 and the forced air-cooled radiator 8). This allows for efficient and easy maintenance work.

[0096] (Item 13) A work machine (1) according to item (8) or (9), comprising a battery unit (9) and an electric motor (6) driven by power supplied from the battery unit (9), wherein the cooled device is at least one of the battery unit (9) and the electric motor (6).

[0097] According to item 13, the cooling water that has been heat exchanged (cooled) in the forced air-cooled radiator 8 can effectively cool at least one of the battery unit 9 and the electric motor 6, which are devices to be cooled.

[0098] (Item 14) The forced air-cooled heat exchange devices 7, 8 have fans 71, 81 and heat exchangers 70, 80 that are arranged opposite the fans 71, 81 and include heat exchange sections 70a, 80a that exchange heat between the cooling air generated by driving the fans 71, 81 and a fluid, and the fans 71, 81 either draw in air around the battery unit 9 as cooling air and discharge it to the outside of the machine body 2 through the air vents 130, 131, or draw in air outside the machine body 2 through the air vents 130, 131 as cooling air and supply it around the battery unit 9.

[0099] According to the work machine 1 of item 14, by driving the fan 71, the air around the battery unit 9 is sucked in as cooling air and discharged to the outside of the machine body 2 through the ventilation opening 131, or the air outside the machine body 2 is sucked in through the ventilation opening 131 as cooling air and supplied around the battery unit 9, thereby exchanging air around the battery unit 9 and cooling the battery unit 9.

[0100] The present invention is not limited to the above-described embodiment, and can be modified as appropriate within the scope of the present invention.

[0101] For example, as a forced air-cooled heat exchanger, a forced air-cooled condenser for air conditioning that exchanges heat between air and a fluid refrigerant may be fixed to the cover member in addition to the forced air-cooled oil cooler 7 and the forced air-cooled radiator 8, or instead of one or both of the forced air-cooled oil cooler 7 and the forced air-cooled radiator 8. Also, only the forced air-cooled oil cooler 7 may be provided as shown in Fig. 10, or only the forced air-cooled radiator 8 may be provided as shown in Fig. 11.

[0102] In the forced air-cooled heat exchangers 7, 8 (forced air-cooled oil cooler 7, forced air-cooled radiator 8) of the above-described embodiments, the heat exchangers 70, 80 are disposed on the vents 130, 131 (rear hood 133) side, and the fans (blowers) 71, 81 are disposed on the equipment housing chamber MR side, but this is not limiting. For example, as shown in Fig. 9, the fans (blowers) 71, 81 may be disposed on the vents 130, 131 (rear hood 133) side, and the heat exchangers 70, 80 may be disposed on the equipment housing chamber MR side.

[0103] Furthermore, the air blowers 71, 81 are not limited to a configuration in which air is sucked from inside the equipment housing room MR and discharged to the outside through the ventilation openings 130, 131, but may be a configuration in which outside air is sucked into the equipment housing room MR through the ventilation openings 130, 131.

[0104] The forced air-cooled heat exchangers 7, 8 are not limited to being fixed to the inner surface of the rear hood 133, but may also be fixed to a position corresponding to the vent hole 132 on the inner surface of the side hood 135, or a vent hole may be provided in the upper hood 134 and fixed to a position corresponding to the vent hole on the inner surface of the upper hood 134. Furthermore, the hood to which the forced air-cooled heat exchangers 7, 8 are fixed, either the side hood 135 or the upper hood 134, may be an openable / closable cover. Fixing the forced air-cooled heat exchangers 7, 8 to the inner surface of an openable / closable cover improves the ease of maintenance and other operations.

[0105] In the above embodiment, a backhoe has been described as an example, but the work machine 1 is not limited to a backhoe. For example, the work machine 1 may be an agricultural machine such as a combine harvester, rice transplanter, or lawnmower, a construction machine such as a wheel loader, compact track loader, or skid steer loader, or an industrial machine such as a forklift. [Explanation of symbols]

[0106] 1: Work equipment 2: Aircraft 4: Work equipment 4a: Shovel equipment 4b: Dozer equipment 5: Hydraulic pump 6: Prime mover (electric motor: cooled equipment, machinery) 7: Forced air-cooled heat exchanger (forced air-cooled oil cooler) 8: Forced air-cooled heat exchanger (forced air-cooled radiator) 9: Battery (battery unit: cooled device, equipment) 13: Bonnet 14: Support frame 15: Hinge 70: Heat exchanger 70a: Heat exchange section 71: Fan (blower: electric fan) 71a: Blower 71b: Propeller 80: Heat exchanger 80a: Heat exchange section 81: Air blower 81a: Blower 81b: Propeller 110: Base plate 130: Vent (first vent) 131: Vent (second vent) 132: Ventilation hole 133: Cover part (rear hood) 136: Mounting part (frame part) 150: Support shaft Pa1: Flow path (primary piping, piping, conduit) Pa2: Flow path (secondary piping, piping, conduit) Pb1: Flow path (primary piping, piping) Pb2: Flow path (secondary piping, piping)

Claims

1. The aircraft and a hood that constitutes the exterior of the aircraft; a forced air-cooled heat exchange device for exchanging heat between air and a fluid; the hood has a vent; The forced air-cooling heat exchanger is attached to the hood of the work machine at a position corresponding to the vent.

2. the hood includes a cover portion that has the vent and is openable and closable, 2. The work machine according to claim 1, wherein the forced air-cooling heat exchanger is attached to an inner surface of the cover portion.

3. the cover portion has a mounting portion for mounting the forced air-cooling heat exchange device; 3. The work machine according to claim 2, wherein the mounting portion is a frame portion that surrounds the vent hole and into which the forced air-cooling heat exchange device can be fitted.

4. The work machine according to claim 3 , wherein the frame provides an airtight seal between the forced air-cooling heat exchanger and the vent.

5. The airframe is a support frame that supports the cover portion; a hinge that connects the support frame and the cover portion so as to be rotatable about a support shaft, a flow path connected to the equipment provided on the airframe and the forced air-cooled heat exchanger attached to the inner surface of the cover portion, and through which the fluid flows; 3. The work machine according to claim 2, wherein the flow path is provided so that the cover portion can be rotated about the support shaft while the flow path remains connected to the equipment and the forced air-cooling heat exchanger.

6. The forced air-cooled heat exchanger is With fans, a heat exchanger that is disposed in a position facing the fan and includes a heat exchange unit that exchanges heat between the cooling air generated by driving the fan and the fluid, The work machine according to any one of claims 1 to 5, wherein the heat exchanger or the fan faces the vent.

7. a working device attached to the machine body and operated by the hydraulic oil, which is the fluid; 2. The work machine according to claim 1, wherein the forced air-cooled heat exchanger is a forced air-cooled oil cooler that exchanges heat between the hydraulic oil and air.

8. a cooled device that is cooled by cooling water as the fluid, 2. The work machine according to claim 1, wherein the forced air-cooling heat exchanger is a forced air-cooling radiator that exchanges heat between the cooling water and air.

9. a working device attached to the machine body and operated by the hydraulic oil, which is the fluid; The fluid is a cooling water. The forced air-cooled heat exchanger includes: a forced air-cooled oil cooler for exchanging heat between the hydraulic oil and air; 2. The work machine according to claim 1, further comprising a forced air-cooling radiator for exchanging heat between the cooling water and air.

10. The forced air-cooled oil cooler has an oil cooler fan that generates cooling air, 10. The work machine according to claim 9, wherein the forced air-cooling radiator has a radiator fan for generating cooling air.

11. The bonnet is a first vent hole through which cooling air from the forced air-cooled oil cooler flows; 11. The work machine according to claim 10, further comprising: a second vent through which cooling air from the forced air-cooling radiator flows.

12. the hood includes a cover portion that has the vent and is openable and closable, The airframe is a support frame that supports the cover portion; a hinge that connects the support frame and the cover portion so as to be rotatable about a support shaft, 12. The work machine according to claim 11, wherein the forced air-cooled oil cooler and the forced air-cooled radiator are arranged side by side on the inner surface of the cover portion along a direction perpendicular to the extending direction of the support shaft.

13. A battery unit; an electric motor driven by power supplied from the battery unit, The work machine according to claim 8 or 9, wherein the cooled device is at least one of the battery unit and the electric motor.

14. The forced air-cooled heat exchanger is With fans, a heat exchanger that is disposed in a position facing the fan and includes a heat exchange unit that exchanges heat between the cooling air generated by driving the fan and the fluid, The work machine according to claim 13, wherein the fan draws in air around the battery unit as the cooling air and discharges it outside the machine body through the ventilation opening, or draws in air outside the machine body through the ventilation opening as the cooling air and supplies it around the battery unit.

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