JP2024048466A - Work Machine - Google Patents

Abstract

[Problem] To improve ease of movement by securing passage space, particularly on the top surface, of the machine room of an upper rotating body. [Solution] A work machine (100) having a lower traveling body (110) and an upper rotating body (120) mounted on the lower traveling body (110), in which a first passage (1) is provided between a boom (141) attached to the upper rotating body (120) and a heat exchanger (3) installed on the top surface of the machine room (160) behind the boom (141). [Selected Figure] Figure 3

Description

This disclosure relates to a work machine.

A known conventional technology for cooling devices in backhoes is one in which the cooler unit is installed on the inside of the roof facing the driver's section, the cooler condenser is installed to the right of the right support pillar located on the right side behind the driver's seat in the driver's section, and the supply and exhaust hose for moving the refrigerant runs from the compressor through the engine room and is placed along the right support pillar (see Patent Document 1).

Patent No. 3375540

However, the above conventional technology does not mention an access passage to climb to the top of the machine body to perform maintenance work on the cooler condenser (referred to as the "air conditioner outdoor unit") or around the engine. Small heavy machinery such as mini-excavators do not require an access passage, but large heavy machinery requires access to the top of the machine body (specifically, the machine room of the upper rotating body) to perform maintenance work. However, with the above conventional technology, the air conditioner outdoor unit is placed adjacent to the driver's seat with no gap between them, which creates the problem that an access passage to the maintenance work space cannot be secured. Furthermore, if an access passage is not secured, there is the problem that maintenance work will be hindered.

Therefore, in one aspect, the present disclosure aims to improve ease of movement by ensuring passage space, particularly on the top surface, of the machinery room of the upper rotating body.

In one aspect, a work machine is provided that has a lower running body and an upper rotating body mounted on the lower running body, and a first passage is provided between a boom attached to the upper rotating body and a heat exchanger installed on the top surface of a machine room behind the boom.

The working machine may be configured such that the extension range of the first passage at least partially overlaps the range of the upper rotating body in the left-right direction with respect to the mounting portion of the boom to the upper rotating body.

The work machine may be configured such that the first passage extends in the left-right direction of the upper rotating body and has a dimension in the fore-aft direction of the upper rotating body that allows walking along the left-right direction of the upper rotating body.

The work machine may be configured such that a first bonnet is provided behind the heat exchanger, the heat exchanger is positioned so that the air outlet of the heat exchanger faces backward, and the front surface of the first bonnet is formed as a forward-facing downward slope.

The work machine may be configured such that the heat exchanger is positioned so that the suction port of the heat exchanger faces forward, and a cover member is attached to the side of the suction port of the heat exchanger.

The work machine may be provided with a second passageway on the side of the heat exchanger, the second passageway connecting the first passageway to at least one of a first maintenance work space located on the side of the heat exchanger and spaced apart from the heat exchanger, and a second maintenance work space located rearward of the heat exchanger.

The work machine may be configured so that the side edge portion of the rear surface of the heat exchanger on the side of the second passage is formed in a chamfered shape in a plan view.

The work machine may be configured such that the rear side edge portion of the heat exchanger is chamfered in a plan view, and a fixing portion for fixing the heat exchanger is provided in the chamfered portion.

The work machine may be configured such that a first bonnet is provided behind the heat exchanger and a second bonnet is provided to the side of the first bonnet, and the second maintenance work space is provided between the first bonnet and the second bonnet and connected to the second passage.

The work machine may be configured such that a bonnet catch for at least one of the first bonnet and the second bonnet is provided on the side of the second maintenance work space.

The work machine may be configured such that at least one fence higher than the first bonnet and the second bonnet is provided behind the second maintenance work space.

According to the present disclosure, in one aspect, it is possible to improve the ease of movement by ensuring passage space, particularly on the top surface, of the machine room of the upper rotating body.

1 is a side view showing the overall configuration of a work machine according to an embodiment. FIG. 2 is a plan view of the work machine of FIG. 1; FIG. 2 is a plan view showing the configuration of an upper rotating body of the work machine of FIG. 1 . FIG. 4 is a perspective view showing an air conditioner outdoor unit installed on the upper rotating body of FIG. 3 . FIG. 4 is a side view illustrating a configuration of a first bonnet provided on the upper rotating body of FIG. 3 . FIG. 4 is a plan view showing the configuration around an air conditioner outdoor unit installed on the upper rotating body of FIG. 3 .

The following describes the embodiment in detail with reference to the attached drawings.

Figure 1 is a side view showing the overall configuration of a work machine 100 according to an embodiment, and Figure 2 is a plan view of the work machine 100. The work machine 100 is used, for example, at civil engineering sites, construction sites, building demolition sites, industrial waste disposal sites, forestry sites, ship holds, and the like. The work machine 100 may be operated by an operator who actually boards the work machine 100 itself, or may be operated remotely without an operator boarding the work machine 100 itself.

The working machine of this embodiment is a working machine 100 having a lower running body 110 and an upper rotating body 120 mounted on the lower running body 110, and a first passage 1 is provided between a boom 141 attached to the upper rotating body 120 and a heat exchanger (specifically, an air conditioner outdoor unit 3 in this embodiment) installed on the top surface of a machine room 160 behind the boom 141.

The work machine 100 is a hydraulic excavator having a crawler-type undercarriage 110 and an upper rotating body 120 mounted on the undercarriage 110 so as to be rotatable along a horizontal plane via a rotating mechanism.

The upper rotating body 120 includes a rotating frame 130 as a vehicle body frame, an attachment 140 attached to the rotating frame 130, a cab 150 as a driver's compartment, a machine room 160, and a counterweight 170 provided on the side opposite the attachment 140 to balance the weight of the attachment 140.

In the description of this embodiment, the directions of the upper rotating body 120, front and rear, left and right, and up and down, are defined as shown in each figure based on a three-dimensional orthogonal coordinate system. Specifically, the side of the upper rotating body 120 where the attachment 140 is provided is the front side, and the side where the counterweight 170 is provided is the rear side.

The attachment 140 is disposed in the front of the upper rotating body 120, approximately in the center in the left-right direction. The attachment 140 has a boom 141 whose base end (i.e., rear end) is rotatably attached to the rotating frame 130, an arm 143 rotatably connected to the tip end (i.e., front end) of the boom 141, and a bucket 144 rotatably attached to the tip end of the arm 143. The boom 141 is attached to the rotating frame 130 by rotatably connecting the base end 142 (specifically, the part including the boom foot pin; also called the "boom foot") via a rotating shaft (called the "boom foot pin") whose axis direction is arranged along the left-right direction. Note that the attachment is not limited to a specific type, and the attachment 140 shown in the figure is merely an example.

The cab 150 is a box-shaped operator's compartment that is equipped with an operator's seat and various operating and control devices for operating the work machine 100. The cab 150 is disposed on the front left side of the upper rotating body 120, adjacent to the left side of the attachment 140 (specifically, the base end portion of the boom 141).

The machinery room 160 is surrounded by a machinery room cover 161. The machinery room cover 161 is preferably made of a highly rigid material. Inside the machinery room 160, for example, heat exchangers such as a radiator, oil cooler, intercooler, and fuel cooler, an engine, and a purification device for purifying the engine exhaust gas (not shown as it is inside) are arranged.

A platform 181 is provided that protrudes forward from a position near the right end of the front end of the rotating frame 130, and a step 182 (two steps in the example shown in the figure) is provided on the front right side of the upper rotating body 120 to allow access from the platform 181 to the top surface of the machine room cover 161. In addition, handrails 183 (two in the example shown in the figure) are provided near the right end between the front end and the middle of the front and rear of the upper rotating body 120 to assist the worker in ascending and descending and moving on the top surface of the machine room cover 161 and to prevent falls.

An air conditioner indoor unit (not shown as it is inside) is provided inside the cab 150, and an air conditioner outdoor unit 3, which is connected to the indoor air conditioner and serves as a heat exchanger in this embodiment, is installed on the upper surface of the machine room cover 161 behind the base end 142 of the boom 141. The air conditioner outdoor unit 3 is positioned so that the outside air intake faces forward and the air outlet 31 faces backward (see also FIG. 4).

A first passage (shaded area indicated by reference numeral 1 in Figures 3 and 6) is provided between the base end 142 of the boom 141 and the air conditioner outdoor unit 3 installed on the upper surface of the machine room cover 161 behind the base end 142 of the boom 141.

Here, if the air conditioner outdoor unit 3 is placed on the top surface of the machine room cover 161 behind the base end 142 of the boom 141 and, unlike the embodiment, a passage is provided behind the air conditioner outdoor unit 3 (on the top surface of the machine room cover 161), it is necessary to prevent interference (in other words, collision) between the boom 141 and the air conditioner outdoor unit 3 when the boom 141 rotates along the up-down direction or tilts backward. Therefore, the air conditioner outdoor unit 3 cannot be placed immediately behind the base end 142 of the boom 141, and the air conditioner outdoor unit 3 has to be placed at a position slightly away from the base end 142 of the boom 141, resulting in a smaller dimension of the passage in the fore-aft direction.

In response to this, by providing the first passage 1 between the base end 142 of the boom 141 and the air conditioner outdoor unit 3 (in other words, providing the first passage 1 in front of the air conditioner outdoor unit 3) as in the embodiment, the first passage 1 becomes a buffer space for preventing interference between the boom 141 and the air conditioner outdoor unit 3 when the boom 141 rotates in the vertical direction or tilts backward. In other words, it is possible to provide the first passage 1 as a configuration that also serves as a buffer space for preventing interference between the boom 141 and the air conditioner outdoor unit 3.

The first passage 1 extends along the left-right direction of the upper rotating body 120, and has a dimension in the front-rear direction of the upper rotating body 120 that allows an operator to walk along the left-right direction of the upper rotating body 120. The dimension that allows an operator to walk is not limited to a specific value, but may be any value in the range of about 300 to 600 mm according to the ISO standard, for example. As the first passage 1, a plate-shaped scaffolding member extending in the left-right direction may be fixed and attached to the upper surface of the machine room cover 161 using bolts, pins, or the like. The scaffolding member may be provided with an anti-slip function, for example, by providing a protrusion that protrudes upward or by attaching rubber or the like.

The extension range L of the first passage 1 in the left-right direction at least partially overlaps with the left-right range of the upper rotating body 120 with respect to the mounting portion of the boom 141. In other words, the extension range L of the first passage 1 in the left-right direction and the range M in the left-right direction corresponding to the width between a pair of left and right vertical plates (also called "boom mounting frames") including the base end 142 of the boom 141 to which the base end 142 is attached by the boom foot pin at least partially overlap with each other (see FIG. 3).

A first bonnet 5A is provided on the top surface of the machine room cover 161, behind the air conditioner outdoor unit 3, and a second bonnet 5B is provided to the left of the first bonnet 5A (and behind the cab 150). That is, the first bonnet 5A is provided on the right side behind the top surface of the machine room cover 161, and the second bonnet 5B is provided on the left side.

The first bonnet 5A and the second bonnet 5B are each dome-shaped members that bulge upward from the top surface of the machine room cover 161.

The first bonnet 5A is attached to the top surface of the machine room cover 161 so as to be able to open and close via hinges 51 (two in the example shown in the figure) attached to the lower end portion of the right side wall. A bonnet catch 52 for locking the opening and closing operation of the first bonnet 5A, and a handle 53 (two in the example shown in the figure) for the operator to grasp when performing the opening and closing operation are provided on the left side wall of the first bonnet 5A.

The second bonnet 5B is attached to the top surface of the machine room cover 161 so as to be able to open and close via hinges 51 (two in the example shown in the figure) attached to the lower end portion of the left side wall. A bonnet catch 52 for locking the opening and closing operation of the second bonnet 5B, and a handle 53 (two in the example shown in the figure) for the operator to grasp when performing the opening and closing operation are provided on the right side wall of the second bonnet 5B.

The front surface 54 of the first bonnet 5A (in other words, the front wall) is formed to have a forward-facing downward slope (see FIG. 5). Here, as described above, the air conditioner outdoor unit 3 is arranged so that the air outlet 31 faces backward, that is, so that the air outlet 31 side is on the first bonnet 5A side. Therefore, by forming the front surface 54 of the first bonnet 5A, which is provided behind the air conditioner outdoor unit 3, to have a forward-facing downward slope, the front surface 54 of the first bonnet 5A does not obstruct the exhaust air from the air conditioner outdoor unit 3. This reduces the exhaust air resistance from the air conditioner outdoor unit 3, allowing for good exhaust air, and good intake of outside air, ensuring a sufficient amount of air hitting the air conditioner outdoor unit 3. Therefore, the air conditioner outdoor unit 3 can be positioned closer to the first bonnet 5A without reducing the air conditioning capacity of the air conditioner. In other words, the air conditioner outdoor unit 3 can be lowered rearward and positioned away from the base end 142 of the boom 141, which makes it possible to increase the longitudinal dimension of the first passage 1, thereby improving the ease of movement of workers on the top surface of the machine room cover 161, and for example, improving the efficiency of maintenance work and shortening the time required for maintenance work. In this embodiment, a bonnet catch is not provided on the front side of the bonnet, so the air conditioner outdoor unit 3 can be positioned closer to the first bonnet 5A provided behind the air conditioner outdoor unit 3.

It is preferable that the lower end position of the forward-facing downward slope of the front surface 54 of the first bonnet 5A is the same as or lower than the height D of the lower end of the air outlet 31 of the air conditioner outdoor unit 3 (see FIG. 5). In other words, it is preferable that the front surface 54 of the first bonnet 5A is formed so as to have a forward-facing downward slope over the entire range that overlaps with the range in the vertical direction (i.e., the height range) of the air outlet 31 of the air conditioner outdoor unit 3.

The left and right side edge portions on the rear side of the air conditioner outdoor unit 3 are each formed to have a chamfered shape in a plan view, and fixing parts 33 for fixing the air conditioner outdoor unit 3 are provided in each of the chamfered parts in a plan view (the shaded parts indicated by reference numerals 32 and 34 in FIG. 6). The air conditioner outdoor unit 3 is fixed and attached to the upper surface of the machine room cover 161 using bolts or pins that penetrate and engage the fixing parts 33.

By providing the fixing portion 33 on the chamfered portions 32, 34 in a plan view of the side edge portion on the rear side of the air conditioner outdoor unit 3, the air conditioner outdoor unit 3 can be moved closer to the surrounding equipment and the distance between them can be reduced, compared to when the fixing portion is provided by protruding backward from the rear surface of the air conditioner outdoor unit 3 or when the fixing portion is provided by protruding sideways from the side surface of the air conditioner outdoor unit 3. This makes it possible to eliminate wasted space around the air conditioner outdoor unit 3, and in turn makes it possible to increase the space for moving the upper surface of the machine room cover 161 and performing maintenance work. Specifically, since the air conditioner outdoor unit 3 can be arranged closer to the rear (i.e., the first bonnet 5A), it is possible to expand the space in front of the air conditioner outdoor unit 3 and increase the dimension of the first passage 1 in the front-rear direction. In addition, since the air conditioner outdoor unit 3 can be arranged closer to the right, it is possible to expand the space on the left side of the air conditioner outdoor unit 3.

A cover member 4 is attached to the suction port side of the air conditioner outdoor unit 3. The cover member 4 is a member for collecting dust, insects, etc., which are expected in the environment in which the work machine 100 is used, for example, for the purpose of preventing dust and insects in particular. For example, a net or cloth is used as the cover member 4, and specifically, a member called an insect filter, dust filter, insect net, dust net, air filter, etc. may be used. The cover member 4 may be attached to the suction port side of the air conditioner outdoor unit 3 so as to be rotatable (in other words, openable and closable) via a hinge or the like, or may be attached so as to be slidable (and further detachable) via a sliding mechanism.

As mentioned above, the air conditioner outdoor unit 3 is positioned so that its outside air intake faces forward, i.e., the side to which the cover member 4 is attached faces the first passage 1. Therefore, a worker can position himself on the first passage 1 to clean or remove the cover member 4 attached to the air conditioner outdoor unit 3, and also remove dust or insects that have become clogged in the outside air intake of the air conditioner outdoor unit 3, making it possible to improve the ease and efficiency of maintenance work on the cover member 4.

A first maintenance work space (shaded area indicated by reference numeral 6 in Figs. 3 and 6) is provided in front of the second bonnet 5B. The first maintenance work space 6 is provided to the left of the air conditioner outdoor unit 3 and separated from the air conditioner outdoor unit 3.

A second maintenance work space (shaded area indicated by reference numeral 7 in Figs. 3 and 6) is provided between the first bonnet 5A and the second bonnet 5B, which are arranged to the left and right. The second maintenance work space 7 is provided on the upper surface of the machine room cover 161, located rearward of the air conditioner outdoor unit 3. As the second maintenance work space 7, a plate-shaped scaffolding member extending in the front-rear direction may be fixed and attached to the upper surface of the machine room cover 161 using bolts, pins, or the like. The scaffolding member may be provided with an anti-slip function, for example, by providing a protrusion that protrudes upward or by attaching rubber or the like.

A second passage (shaded portion of reference number 2 in Fig. 3 and Fig. 6) is provided on the left side of the air conditioner outdoor unit 3, connecting the first passage 1 and the first maintenance work space 6 and also connecting the first passage 1 and the second maintenance work space 7. The second passage 2 is provided to be connected to the left end of the first passage 1, to the right end of the first maintenance work space 6, and to the front end (the left part of the left part) of the second maintenance work space 7 (note that the first passage 1, the second passage 2, the first maintenance work space 6, and the second maintenance work space 7 may be provided as passages or spaces that are connected to each other, and which part each is connected to is merely an example). As the second passage 2, a plate-shaped scaffolding member extending in the front-rear direction may be fixed and attached to the upper surface of the machine room cover 161 using bolts, pins, etc. The scaffolding member may be provided with a non-slip function, for example, by providing a protrusion that protrudes upward or by attaching rubber or the like.

The second passage 2 connects the first passage 1 to the first maintenance work space 6 and the second maintenance work space 7, facilitating access to the first maintenance work space 6 and the second maintenance work space 7, which in turn improves the ease of movement of workers on the top surface of the machine room cover 161, making it possible, for example, to improve the efficiency of maintenance work and shorten the time required for maintenance work.

As described above, the left and right side edge portions on the rear side of the air conditioner outdoor unit 3 are chamfered in plan view. That is, the left edge portion on the rear side of the air conditioner outdoor unit 3, on the side of the second passage 2, is chamfered in plan view (shaded portion indicated by reference numeral 34 in FIG. 6). This increases the space at the junction between the second passage 2 and the second maintenance work space 7 (specifically, the space between the air conditioner outdoor unit 3 and the second bonnet 5B), making it easier to move between the second passage 2 and the second maintenance work space 7, which in turn makes it easier for workers to move around on the top surface of the machine room cover 161, and for example makes it possible to improve the efficiency of maintenance work and shorten the time required for maintenance work.

As described above, the bonnet catch 52 and the handle 53 are provided on the left wall of the first bonnet 5A, and the bonnet catch 52 and the handle 53 are provided on the right wall of the second bonnet 5B. That is, the bonnet catch 52 and the handle 53 of the first bonnet 5A and the second bonnet 5B are provided on the side of the second maintenance work space 7. This makes it easier to access the bonnet catch 52 in the second maintenance work space 7 through the first passage 1 and the second passage 2, and in turn makes it easier to open and close the first bonnet 5A and the second bonnet 5B, and for example, it is possible to improve the efficiency of the maintenance work and shorten the time required for the maintenance work. Note that the bonnet catch 52 and the handle 53 of either the first bonnet 5A or the second bonnet 5B may be provided on the side of the second maintenance work space 7.

In addition, the upper surface of the counterweight 170 is provided with hanging rings 8 (two in the example shown in the figure) used when suspending the work machine 100. The second maintenance work space 7 is provided between the first bonnet 5A and the second bonnet 5B, which are arranged to the left and right, making it easier to access the hanging rings 8 through the first passage 1, the second passage 2, and the second maintenance work space 7, which in turn makes it easier for workers to move around on the upper surface of the machine room cover 161. For example, this makes it possible to improve the efficiency of the work of suspending and transporting the work machine 100 and shorten the time required for such work.

In addition, a fence 9 (specifically, for example, a guide rail or handrail) is provided on the upper surface of the counterweight 170 to prevent the second maintenance work space 7 from entering the rear end of the counterweight 170 and preventing it from falling. In addition, the fence 9 is configured to be higher than the first bonnet 5A and the second bonnet 5B (or a cover covering the muffler; the same applies below). When working in a place with a structure above and a low ceiling (i.e., the space above the upper rotating body 120 is narrow), the first bonnet 5A and the second bonnet 5B may come into contact with the structure above and be damaged (damaged). However, since the fence 9 comes into contact with the structure above first, it is possible to prevent the first bonnet 5A and the second bonnet 5B from being damaged or broken. The fence 9 may be provided in a single piece (one piece) behind the second maintenance work space 7 as shown in FIG. 3, or may be provided behind at least one of the first bonnet 5A and the second bonnet 5B in addition to the rear of the second maintenance work space 7 (i.e., multiple fences may be provided).

According to the embodiment of the work machine, a first passage 1 is provided between the base end 142 of the boom 141 attached to the upper rotating body 120 and the air conditioner outdoor unit 3 installed on the top surface of the machine room 160 behind the base end 142 of the boom 141, so that passage space can be secured, particularly on the top surface of the machine room cover 161 of the upper rotating body 120, improving ease of movement.

Although the embodiments of the present invention have been described above, the specific configuration of the present invention is not limited to the above-mentioned embodiments, and the present invention also includes modifications and changes to the above-mentioned embodiments that do not deviate from the gist of the present invention.

For example, in the above embodiment, the working machine 100 (specifically, a hydraulic excavator) shown in Figures 1 and 2 is given as an example, but the specific configuration of the working machine of the present invention is not limited to the working machine 100 shown in Figures 1 and 2, and the present invention can be applied to various working machines, particularly those having a boom. Just to be sure, even if the positional relationship of each part of the upper rotating body 120 in the above embodiment is reversed from left to right, this will not cause a problem in applying the present invention.

In addition, in the above embodiment, the air conditioner outdoor unit 3 is installed on the upper surface of the machine room 160 behind the boom 141, but one or more predetermined heat exchangers may be installed on the upper surface of the machine room 160 behind the boom 141 instead of the air conditioner outdoor unit 3 or together with the air conditioner outdoor unit 3. Examples of predetermined heat exchangers include radiators, oil coolers, intercoolers, fuel coolers, etc. that were previously installed in other locations, as well as additional radiators, additional oil coolers, additional intercoolers, and additional fuel coolers that are positioned as additional units to those already installed. In this case, by moving some of the equipment that was previously installed inside the machine room 160 to the outside (specifically, to the upper surface of the machine room cover 161), it is possible to secure free space inside the machine room 160, which, for example, improves the ease of maintenance work and shortens the time required for maintenance work. In addition, by adding a heat exchanger to the outside (specifically, on the top surface of the machine room cover 161) to supplement some of the equipment already installed, it is possible to improve the heat exchange capacity without compressing the space inside the machine room 160, and by extension, to prevent overheating. In other words, in this invention, at least one of an air conditioner outdoor unit, a radiator, an oil cooler, an intercooler, and a fuel cooler is installed as a heat exchanger on the top surface of the machine room 160 behind the boom 141.

In addition, in the above embodiment, the first bonnet 5A and the second bonnet 5B are provided, but only one of the first bonnet 5A and the second bonnet 5B may be provided. Furthermore, in the above embodiment, the first maintenance work space 6 and the second maintenance work space 7 are provided, but only one of the first maintenance work space 6 and the second maintenance work space 7 may be provided.

1 First passage 2 Second passage 3 Air conditioner outdoor unit (heat exchanger)
31 Air outlet 32 Chamfered portion 33 Fixing portion 34 Chamfered portion 4 Cover member 5A First bonnet 5B Second bonnet 51 Hinge 52 Bonnet catch 53 Handle 54 Front surface 6 First maintenance work space 7 Second maintenance work space 8 Suspension ring 9 Fence 100 Work machine 110 Lower running body 120 Upper rotating body 130 Rotating frame 140 Attachment 141 Boom 142 Base end portion 143 Arm 144 Bucket 150 Cab 160 Machine room 161 Machine room cover 170 Counterweight 181 Step 182 Ascending and descending step 183 Handrail

Claims (11)

A work machine having a lower traveling body and an upper rotating body mounted on the lower traveling body,
a first passageway provided between a boom attached to the upper rotating body and a heat exchanger installed on an upper surface of a machine room behind the boom. The work machine according to claim 1, wherein the extension range of the first passage overlaps at least partially with the mounting portion of the boom to the upper rotating body in the left-right direction of the upper rotating body. The work machine according to claim 1, wherein the first passage extends in the left-right direction of the upper rotating body and has a dimension in the front-rear direction of the upper rotating body that allows walking along the left-right direction of the upper rotating body. A first bonnet is provided behind the heat exchanger,
The heat exchanger is arranged so that an air outlet of the heat exchanger faces backward,
The work machine according to claim 1 , wherein a front surface of the first bonnet is formed into a forwardly downward slope. The heat exchanger is arranged so that an intake port of the heat exchanger faces forward,
The work machine according to claim 1 , further comprising a cover member attached to a side of the suction port of the heat exchanger. The work machine according to claim 1, further comprising a second passageway provided on the side of the heat exchanger, the second passageway connecting the first passageway to at least one of a first maintenance work space located on the side of the heat exchanger and spaced apart from the heat exchanger, and a second maintenance work space located rearward of the heat exchanger. The work machine according to claim 6, wherein the side edge portion on the rear side of the heat exchanger, on the side of the second passage, is formed in a chamfered shape in a plan view. A side edge portion on a rear surface side of the heat exchanger is formed in a chamfered shape in a plan view,
The work machine according to claim 1 , wherein the chamfered portion is provided with a fixing portion for fixing the heat exchanger. A first bonnet is provided behind the heat exchanger,
A second bonnet is provided on a side of the first bonnet,
7. The work machine according to claim 6, wherein the second maintenance work space is provided between the first bonnet and the second bonnet and connected to the second passageway. The work machine according to claim 9, wherein a bonnet catch for at least one of the first bonnet and the second bonnet is provided on the side of the second maintenance work space. The work machine according to claim 9, wherein at least one fence higher than the first bonnet and the second bonnet is provided behind the second maintenance work space.