Hood structure for electric construction machine

Abstract

This hood structure for an electric construction machine (10) comprises a high-voltage unit (36) and a hood (25) that defines an accommodation space (28) for accommodating the high-voltage unit (36). The hood (25) includes: a hood body (30) that includes a plurality of panels (31-33); and fixing members (42) that fix each of the panels (31-33) to a body (27). A tool is required for attaching and detaching the fixing members (42), and each of the panels (31-33) is opened by releasing the fixing of the fixing members (42) using the tool.

Description

Bonnet Structure of Electric Construction Machinery 【0001】 The present invention relates to a bonnet structure of an electric construction machinery. 【0002】 Conventionally, as a bonnet of a construction machinery, those described in, for example, Japanese Patent Application Laid-Open No. 2014-095203 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2024-035636 (Patent Document 2) are known. 【0003】 In the bonnet of Patent Document 1, an inspection window for accessing the space under the bonnet is formed. The inspection window is detachably covered with an inspection cover which is a flat rectangular plate. 【0004】 The bonnet of Patent Document 2 includes a left upper surface cover, an engine hood, and a right upper surface cover. The left upper surface cover and the right upper surface cover are fixedly attached to the bonnet body in a non-openable / closable manner. The engine hood is connected to the bonnet body by a hinge and is made openable / closable. Daily inspections such as checking the remaining amount of engine oil and maintenance work such as replacement are carried out by opening the engine hood. 【0005】 Conventional construction machinery mounts an internal combustion engine such as a diesel engine as a main drive source for sending hydraulic oil to an attachment. It also mounts a battery and power lines for driving auxiliary equipment such as a lighting device. In this case, the voltage of the battery is generally 12V. 【0006】In response to the recent demand for decarbonized energy, electrification is being introduced in construction machinery as well, replacing some or all of the main drive sources that drive the attachments of construction machinery from internal combustion engines to electric motors such as rotating electric motors and electric actuators. Electrified construction machinery houses high-voltage equipment, which are components related to the power supply to the main drive source (electric motor), in the storage space under the hood. High-voltage equipment for the main drive source includes, for example, batteries with a much larger capacity than conventional construction machinery batteries, inverters, and other related components. On the other hand, electrified construction machinery also has low-voltage equipment that complements the high-voltage equipment. Low-voltage equipment refers to equipment that is connected to low-voltage circuits with a DC voltage of less than 100V (e.g., 12V, 24V), such as lighting fixtures, solenoid valves, wireless communication devices, control electronic circuits such as microcontrollers, and by-wire systems. In other words, high-voltage equipment refers to components of high-voltage circuits that are installed separately from low-voltage circuits, and includes DC equipment and AC equipment. The voltage (rated voltage) of high-voltage equipment is, for example, 650V for DC and 700V for AC. 【0007】 Since electric construction machinery is equipped with high-voltage equipment such as high-voltage batteries, high-voltage inverters, and high-voltage power lines, which fall under the high-voltage category mentioned above, it is preferable to take measures to prevent people from easily touching them, compared to conventional electrical equipment that operates at low voltages such as 12V. 【0008】 Nevertheless, the inspection covers and hoods described in the aforementioned patent documents were designed to be relatively easy to open. Therefore, there is a risk that workers unfamiliar with handling electrical equipment may inadvertently open the inspection covers or hoods. 【0009】 Furthermore, high-voltage equipment is vulnerable to water droplets such as rain. Despite this, the conventional bonnet structure described in the aforementioned patent document did not specifically address water exposure to high-voltage equipment. As a result, if the inspection cover or hood described in the patent document is opened carelessly, there is a risk that the high-voltage equipment may be exposed to water droplets, leading to deterioration or short circuits. 【0010】 Japanese Patent Publication No. 2014-095203 Japanese Patent Publication No. 2024-035636 【0011】In view of the above circumstances, the present invention aims to provide a bonnet structure for electric construction machinery that can protect high-voltage equipment from water droplets and ensure worker safety by suppressing the accidental opening of the bonnet body, and at the same time improve the efficiency of maintenance work. 【0012】 The bonnet structure of the present invention, devised for this purpose, relates to an electric construction machine including an electric motor as the main drive source, and comprises high-voltage equipment including equipment for supplying power to the electric motor, and a bonnet that defines a housing space for housing the high-voltage equipment. The bonnet includes a bonnet body including a plurality of panels, and fixing members that fix the plurality of panels to the body of the electric construction machine, respectively. A tool is required to attach and detach the fixing members, and each of the panels is opened by releasing the fixing members using the tool. 【0013】 According to the present invention, the effort required to separate multiple panels prevents accidental opening of the bonnet body. This prevents water from reaching high-voltage equipment and prevents workers from accidentally coming into contact with high-voltage equipment. Furthermore, since high-voltage equipment can be exposed by separating one or more of the multiple panels, the efficiency of maintenance work can be improved. 【0014】 This is a perspective view showing an electric construction machine according to one embodiment of the present invention. This is a perspective view showing the electric construction machine with the bonnet body separated. This is a top view of the electric construction machine. This is a rear view of the electric construction machine. This is a top view showing the housing space of the electric construction machine. This is a perspective view showing the bonnet body of the electric construction machine. This is a cross-sectional view showing the connection of two panels in the bonnet body. This is a perspective view showing the fixing structure between the second panel and the body. 【0015】 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Figure 1 is a perspective view showing an electric construction machine 10 according to one embodiment of the present invention. Note that the front, rear, left, and right directions shown in Figure 1 are based on the perspective of an operator seated in a normal posture in the cabin 26 of the electric construction machine 10, which will be described later. 【0016】The electric construction machine 10 comprises a lower traveling body 11 having a pair of left and right tracks 12, 12, and an upper slewing body 21 that is rotatably connected to the lower traveling body 11. The upper slewing body 21 is rotatable about a slewing axis X that extends vertically through the center of the lower traveling body 11 and the center of the upper slewing body 21. 【0017】 The rear end of the boom 22 is connected to the center of the upper slewing body 21 via a pivot. The boom 22 extends forward and upward from the upper slewing body 21, and the front end of the boom 22 (not shown) is capable of swinging vertically. The electric construction machine 10 is, for example, a power shovel. In this case, an arm (not shown) is connected to the front end of the boom 22 via a pivot. Furthermore, a bucket (not shown) is connected to the tip of the arm via a pivot. Alternatively, the bucket and arm described above may be interchangeable with other attachments not shown. 【0018】 The electric construction machine 10 is equipped with an electric motor (not shown) consisting of a rotating electric motor or other electric actuator as the main drive source for driving attachments including a boom 22, etc. The electric construction machine 10 only needs to include an electric motor for driving attachments, but may further include an electric motor for driving the lower traveling body 11 (tracks 12). In other words, the electric construction machine 10 in this embodiment may operate only the attachments electrically, or it may operate both the attachments and the lower traveling body 11 electrically. 【0019】The upper slewing body 21 has a cabin 26 positioned off-center to one side (in this case, the left side) in the width direction at its front. The upper slewing body 21 is provided with a body 27 that forms the outer casing of its rear and a bonnet 25 that is mounted on top of the body 27. The body 27 is a wall erected on the outer edge of the upper frame (not shown) that constitutes the bottom surface of the upper slewing body 21, and defines both the left and right sides and the rear surface at the rear of the upper slewing body 21. The bonnet 25 includes a bonnet body 30 that covers the top surface of the body 27 and a plurality of bolts 42 (Figure 3, etc.) that fix the bonnet body 30 to the body 27. The bonnet body 30 has a width dimension corresponding to the distance from one side to the other in the width direction of the upper slewing body 21 and covers the upper edge of the body 27 so as to cover the entire top surface of the body 27. The bolts 42 correspond to the "fixing members" in this invention. 【0020】 Figure 2 is a perspective view showing the electric construction machine 10 with the bonnet body 30 open. As shown in this figure, the bonnet body 30 covers the storage space 28 partitioned in the body 27 from above, and has the function of preventing water droplets such as rain from entering the storage space 28. The storage space 28 is formed directly below the bonnet body 30. The storage space 28 houses the above-mentioned electric main drive source (electric motor) that drives at least the attachment (boom 22, etc.) of the electric construction machine 10, high-voltage equipment 36 electrically connected to the main drive source, a radiator 37 for cooling the main drive source and the high-voltage equipment 36, and other auxiliary equipment. These devices are grouped together with related equipment and installed in their respective compartments within the storage space 28. 【0021】 The high-voltage equipment 36 includes a group of components related to supplying power to the main drive source (motor motor). For example, the high-voltage equipment 36 includes a battery that stores the power supplied to the main drive source, an inverter that converts the power stored in the battery and supplies it to the main drive source, and other related equipment. 【0022】The radiator 37 is positioned adjacent to the intake port 41 that penetrates the body 27. The radiator 37 is a cooling device that takes in outside air from the intake port 41 into the body 27 and performs heat exchange with the taken-in outside air. In this embodiment, the intake port 41 is formed on one side of the body 27 in the width direction, on the side furthest from the high-voltage equipment 36. The radiator 37 is installed at one end of the housing space 28 in the width direction, close to the intake port 41. The high-voltage equipment 36 is installed in the other area of ​​the housing space 28 in the width direction. Specifically, the high-voltage equipment 36 is installed in the area extending from the other end of the housing space 28 in the width direction to the central part. 【0023】 The bonnet body 30 includes a plurality of panels that are separable from each other. Specifically, the bonnet 30 includes a first panel 31, a second panel 32, and a third panel 33. Hereinafter, when referring to these first to third panels 31 to 33 without particular distinction, they will simply be referred to as panels. The first to third panels 31 to 33 are separable from each other. By having the first to third panels 31 to 33 overlap the body 27 at predetermined positions, adjacent panels are connected to each other, and the bonnet body 30 is formed by combining the panels 31 to 33. 【0024】 Each of the panels 31 to 33 is arranged such that the edges of adjacent panels overlap in the vertical direction. Specifically, the right edge of the first panel 31 is positioned lower than the left edge of the third panel 33 (Figure 7). Also, the right edge of the first panel 31 is positioned lower than the left edge of the second panel 32 (Figure 7). Furthermore, the rear edge of the second panel 32 is positioned lower than the front edge of the third panel 33. In other words, the pairs of the first panel 31 and the third panel 33, the pairs of the first panel 31 and the second panel 32, and the pairs of the second panel 32 and the third panel 33 are all arranged such that the edges of adjacent panels overlap in the vertical direction. These three panel pairs correspond to the "panel pairs" in the present invention. 【0025】The first panel 31, the second panel 32, and the third panel 33 are assembled to the body 27 in this order. Conversely, when opening the hood body 30, the panels must be removed from top to bottom in the order of third panel 33, second panel 32, and first panel 31. The third panel 33 is larger than both the first panel 31 and the second panel 32. Because the third panel 33, which is the first to be removed, is larger, the possibility of the hood body 30 being opened unintentionally is reduced. 【0026】 Preferably, the size of each panel 31 to 33 is set such that at least the largest third panel 33 is several times larger than the size of a typical inspection window in construction machinery. By setting the size of panels 31 to 33 in this way, a wide area of ​​the storage space 28 is opened up when the bonnet body 30 is removed. This makes it easier to perform maintenance work on the high-voltage equipment 36. 【0027】 Figure 3 is a plan view of the electric construction machine 10. As shown in Figures 1 to 3, the first panel 31 is positioned in one area in the width direction at the rear of the upper slewing body 21. The third panel 33 is positioned in the other area in the width direction at the rear of the upper slewing body 21. In this embodiment, the first panel 31 is positioned to cover the left side area of ​​the body 27 located behind the cabin 26. The third panel 33 is positioned to cover the right side area of ​​the body 27 located behind and to the right of the cabin 26. The second panel 32 is positioned to cover the remaining area of ​​the body 27, that is, the front right area of ​​the body 27 located to the right of the first panel 31 and in front of the third panel 33. 【0028】Figure 4 is a rear view of the electric construction machine 10. Referring to Figures 3 and 4, as well as the perspective view of Figure 1, the first panel 31 includes a peripheral edge 31a of a constant height, upper walls 31b and 31d of different heights extending along planes substantially perpendicular in the vertical direction, a left wall 31c which is a leftward-facing (or leftward-upward-facing) vertical wall connecting the upper walls 31b and 31d, and a rear wall 31j which is a substantially rearward-facing vertical wall rising from the peripheral edge 31a and connecting to the upper wall 31d. The upper wall 31b is approximately the same height as the peripheral edge 31a, or slightly higher than the peripheral edge 31a. The upper wall 31d is higher than the upper wall 31b. 【0029】 The second panel 32 includes a peripheral edge 32a of a certain height and a front wall 32f which is a forward-facing (or forward-slanted upward-facing) vertical wall rising from the peripheral edge 32a. 【0030】 The third panel 33 includes a peripheral edge 33a of a certain height, an upper wall 33e extending along a plane substantially perpendicular to the vertical direction, a right wall 33g which is a rightward-facing vertical wall rising from the peripheral edge 33a toward the upper wall 33e, and a rear wall 33j which is a backward-facing vertical wall rising from the peripheral edge 33a toward the upper wall 33e. 【0031】 The peripheral edges 31a, 32a, and 33a of each panel 31 to 33 are aligned along the upper edge of the body 27 (Figure 1) and are fixed to the upper edge of the body 27 by bolts 42, which are fixing members. Tools such as a wrench are required to attach and detach the bolts 42. In other words, the first to third panels 31 to 33 that constitute the bonnet body 30 are each fixed to the body 27 via bolts 42, which require tools. Furthermore, each panel 31 to 33 can be removed from the body 27 by loosening the bolts 42 using a tool. 【0032】With each panel 31-33 placed over the body 27, a first groove 43 extending in the front-to-back direction is formed between adjacent first panel 31 and third panel 33. The first groove 43 is also formed between adjacent first panel 31 and second panel 32. In addition, a second groove 44 extending in the left-to-right direction is formed between adjacent second panel 32 and third panel 33. In other words, the first panel 31 is connected to the second panel 32 and third panel 33 via the first groove 43 extending in the front-to-back direction, and the third panel 33 is connected to the second panel 32 via the second groove 44 extending in the left-to-right direction. 【0033】 Figure 5 is a plan view showing the storage space 28 beneath the bonnet body 30, corresponding to the open state of the bonnet body 30 shown in Figure 3. Referring to Figure 5, the storage space 28 includes a first section 28b, a second section 28c, and a third section 28d. The first section 28b occupies directly below the first panel 31. The second section 28c occupies directly below the second panel 32. The third section 28d occupies directly below the third panel 33. The first to third sections 28b, 28c, and 28d are adjacent to each other. The third section 28d is formed to the right of the first section 28b, and the second section 28c is formed in front of the third section 28d and to the right of the first section 28b. In plan view, the area of ​​the third section 28d is the largest, and the area of ​​the second section 28c is the smallest. 【0034】 The first section 28b is mainly used to install equipment that requires relatively infrequent maintenance. As an example of such equipment, in this embodiment, a radiator 37 is installed in the first section 28b. The radiator 37 is installed in the vicinity of the air intake 41 within the first section 28b, and is positioned mainly facing the air intake 41 in the left-right direction. 【0035】 The third compartment 28d is mainly used to install equipment that requires relatively frequent maintenance. As an example of such equipment, in this embodiment, a high-voltage device 36 is installed in the third compartment 28d. As previously described, the high-voltage device 36 includes a battery and inverter for the main power source. As shown in Figures 2 and 4, the high-voltage device 36 is installed in the third compartment 28d such that a part of it protrudes above the upper edge of the body 27. 【0036】The second section 28c is where auxiliary equipment related to the main drive source is installed. For example, the second section 28c is where cords, tubes, and hoses (not shown) extending from the first section 28b are installed. 【0037】 Figure 6 is a perspective view showing how water droplets W, such as rainwater, land on the bonnet body 30. When the water droplets W fall on the bonnet body 30, they flow along the upper surface of the bonnet body 30 toward the peripheral edges 31a, 32a, and 33a of each panel 31 to 33. At this time, some of the water droplets W enter the grooves 43 and 44. The water droplets W that enter flow along the grooves 43 and 44 in the direction of the arrows. Finally, the water droplets W cross the peripheral edges 31a, 32a, and 33a of each panel 31 to 33 and are discharged to the outside of the bonnet body 30. The first groove 43 passes through the center of the bonnet body 30 and extends in the front-to-back direction to the peripheral edge of the bonnet body 30. The second groove 44 passes through the center of the bonnet body 30 and extends in the left-to-right direction. One end of the second groove 44 is connected to the first groove 43, and the other end of the second groove 44 extends to the peripheral edge of the bonnet body 30. 【0038】 Figure 7 is a cross-sectional view of the first groove 43. The first groove 43 is formed between opposing edges of the first panel 31 and the third panel 33. In this embodiment, the first groove 43 is formed between the right edge of the first panel 31 and the left edge of the third panel 33. The first panel 31 and the third panel 33 are connected to each other such that the right edge of the first panel 31 is lower than the left edge of the third panel 33. A gutter 35 with an open top is formed on the right edge of the lower first panel 31. A downward-hanging opposing wall 33k is formed on the left edge of the upper third panel 33. The opposing wall 33k is housed in the gutter 35, thereby forming the first groove 43 extending in the front-rear direction inside the gutter 35. 【0039】The gutter 35 of the first panel 31 extends in the front-rear direction along the first groove 43. The gutter 35 has a pair of side walls 35b and 35d that face each other in the left-right direction in a cross-sectional view of Figure 7 perpendicular to the front-rear direction, and a bottom wall 35c that connects the lower ends of the side walls 35b and 35d. Of the pair of side walls 35b and 35d, the side wall 35b that is further from the center of the third panel 33 faces the opposing wall 33k of the third panel 33 at a relatively small distance. The first groove 43 is formed between the side wall 35b of the gutter 35 of the first panel 31 and the opposing wall 33k of the third panel 33. 【0040】 Of the pair of side walls 35b and 35d of the gutter 35, the side wall 35d closer to the center of the third panel 33 is covered from above by the third panel 33 and faces the opposing wall 33k of the third panel 33 at a relatively large distance. As a result, the cross-section of the gutter 35 is made larger than the cross-section of the first groove 43. Therefore, a sufficient amount of water can flow through the gutter 35, and even if the rainfall per unit time is high, water is less likely to overflow from the gutter 35. In addition, the portion of the third panel 33 that extends to the right from the upper end of the opposing wall 33k functions as an overhang that covers the gutter 35 from above. 【0041】 Referring also to Figure 6, the first groove 43 and the gutter 35 are formed so that their height gradually or in stages decreases from the center of the bonnet body 30 toward the peripheral edge (front edge and rear edge) of the bonnet body 30. Therefore, when a water droplet W enters the first groove 43 via the third panel 33, as indicated by the arrow in Figure 7, the water droplet W flows toward the peripheral edge of the bonnet body 30 through the gutter 35, as indicated by the arrow in Figure 6, and is quickly discharged to the outside of the bonnet body 30. 【0042】 The cross-section of the second groove 44 is the same as that of the first groove 43 described above. That is, the second groove 44 is formed between the rear edge of the second panel 32 and the front edge of the third panel 33. A trough extending along the second groove 44 is formed at the rear edge of the lower second panel 32, and an opposing wall portion is formed at the front edge of the third panel 33 that is housed in the trough and faces the side wall of the trough. The second groove 44 and the trough extend to the peripheral edge (right edge) of the bonnet body 30, with their height gradually or in stages decreasing. 【0043】In the present embodiment, the first groove 43 and the gutter 35 corresponding thereto are formed at a position avoiding directly above the intake port 41. Specifically, the first groove 43 and the gutter 35 extend in the front-rear direction at a position away from the intake port 41 to the right, and are not formed in the vicinity of the intake port 41. Similarly, the second groove 44 and the gutter corresponding thereto are formed at a position avoiding directly above the intake port 41. 【0044】 FIG. 8 is a perspective view showing the fixing structure of the second panel 32 and the body 27 of the present embodiment, and represents a state in which the second panel 32 is viewed from obliquely above the front side and the right side of the electric construction machine 10. As shown in FIG. 8, a bracket 29 is directly or indirectly attached and fixed to the body 27, which is a mating member for covering the bonnet body 30. The bracket 29 has an upper plate portion 29b extending in the width direction of the upper swing body 21, cutouts 29c, 29c formed at both ends of the upper plate portion 29b, respectively, and a lower plate portion 29d facing the upper plate portion 29b. The cutout 29c is open at the front. The lower plate portion 29d is provided at least at both ends of the bracket 29, respectively. 【0045】 A fixing plate 38 is disposed between the upper plate portion 29b and the lower plate portion 29d. The fixing plate 38 is a strip-shaped plate piece, and two female screws 38h are provided at both ends. The female screw 38h is, for example, a nut welded to the fixing plate 38. 【0046】 A plurality of through holes 32ah are formed in the peripheral edge portion 32a of the second panel 32. Bolts 42 are passed through each through hole 32ah from above. The shaft portions of the bolts 42 are loosely screwed into the female screws 38h in advance. Thereby, the fixing plate 38 is suspended from the peripheral edge portion 32a. 【0047】 When covering and fixing the second panel 32 to the body 27, each bolt 42 and the suspended fixing plate 38 are moved from the front to the rear. As a result, the shaft portions of the bolts 42 are inserted into the cutouts 29c, and the fixing plate 38 is inserted between the upper plate portion 29b and the lower plate portion 29d, and the peripheral edge portion 32a is placed on the body 27. Next, by tightening each bolt 42, the second panel 32 is fixed to the body 27. The removal of the second panel 32 is the reverse procedure of the above-described procedure. 【0048】 As described above, in this embodiment, the high-voltage device 36 is installed in the accommodation space 28 of the electric construction machine 10, and the high-voltage device 36 is covered by the bonnet body 30 including the first to third panels 31 to 33. The first to third panels 31 to 33 are respectively fixed to the body 27 of the electric construction machine 10 by bolts 42. According to such a configuration, the bonnet body 30 cannot be opened unless the fixing of the panel by the bolts 42 is released using tools, so that the inadvertent opening of the bonnet body 30 is suppressed. As a result, it is difficult for the high-voltage device 36 to be wetted unintentionally, and the possibility of deterioration and short circuit occurring in the high-voltage device 36 is reduced. In addition, the possibility that an operator accidentally touches the high-voltage device 36 can be reduced, and the safety of the operator can be ensured. Furthermore, since the high-voltage device 36 can be exposed by separating at least the third panel 33 among the first to third panels 31 to 33 from the body 27, the efficiency of the work for maintaining the high-voltage device 36 can be improved. 【0049】 Also, in this embodiment, the bonnet body 30 has a three-dimensional shape including upper walls 31b, 31d, 33e, a front wall 32f, rear walls 31j, 33j, a left wall 31c, and a right wall 33g. When the bonnet body 30 having such a three-dimensional shape is opened, the high-voltage device 36 is exposed over a wide range so that access can be made not only from above but also from the front, rear, left, and right as compared with the case where, for example, a bonnet body having only an upper wall is opened. Therefore, access to the high-voltage device 36 becomes easy, and the efficiency of the work for maintaining the high-voltage device 36 can be improved. Note that the front wall 32f, the rear walls 31j, 33j, the left wall 31c, and the right wall 33g of the bonnet body 30 respectively correspond to the "peripheral wall" in the present invention. 【0050】Furthermore, in this embodiment, the housing space 28 includes a first section 28b and a second section 28c where equipment other than the high-voltage equipment 36 is installed, and a third section 28d where the high-voltage equipment 36 is installed. The bonnet body 30 includes a first panel 31 covering the first section 28b, a second panel 32 covering the second section 28c, and a third panel 33 covering the third section 28d. In this way, when the multiple sections 28b, 28c, and 28d of the housing space 28 are individually covered by the multiple panels 31, 32, and 33, it is not always necessary to remove all the panels when maintaining the equipment in each section 28b, 28c, and 28d, thereby improving the efficiency of maintenance work. For example, if it is necessary to maintain the high-voltage equipment 36, the third section 28d can be opened and the high-voltage equipment 36 can be maintained simply by removing the corresponding third panel 33. In other words, since it is not necessary to remove all of the first to third panels 31 to 33 for maintenance of the high-voltage equipment 36, the efficiency of maintenance work can be improved. 【0051】 Furthermore, in this embodiment, the first to third panels 31 to 33 are connected such that the edges of adjacent panels overlap in the vertical direction. With this configuration, the installation and removal order of panels 31 to 33 is defined, so that the opportunities for panels covering areas with infrequent maintenance or panels that do not need to be removed to be removed are reduced. 【0052】 Specifically, in this embodiment, the first panel 31 covering the radiator 37, which is a piece of equipment that requires relatively less maintenance, is positioned relatively lower, corresponding to the maintenance frequency of the equipment installed in each of the first to third sections 28b to 28d, and the third panel 33 covering the high-voltage equipment 36, which is a piece of equipment that requires relatively more maintenance, is positioned relatively higher. With this configuration, when performing maintenance on the equipment that requires more maintenance (high-voltage equipment 36), it becomes unnecessary to remove the first panel 31 covering the equipment that requires less maintenance (radiator 37), thus improving the efficiency of maintenance work. 【0053】Furthermore, in this embodiment, as shown in Figure 7, a first groove 43 is formed between the right edge of the first panel 31 and the left edge of the third panel 33, which overlap vertically. A gutter 35 is formed on the right edge of the lower first panel 31, accommodating the left edge (opposing wall 33k) of the upper third panel 33 and defining the first groove 43. As shown in Figure 6, the gutter 35 extends to the front and rear edges of the bonnet body 30, gradually or in stages decreasing in height. With this configuration, water droplets W that land on the bonnet body 30 are quickly discharged to the outside of the bonnet body 30 by traveling along the gutter 35 (along the first groove 43). 【0054】 The same applies to the second groove 44 formed between the second panel 32 and the third panel 33. That is, a gutter is formed at the rear edge of the lower second panel 32, accommodating the front edge of the upper third panel 33 and defining the second groove 44. This gutter extends to the right edge of the bonnet body 30, gradually or in stages decreasing in height. With this configuration, water droplets W that land on the bonnet body 30 are quickly discharged to the outside of the bonnet body 30 by traveling along the gutter (along the second groove 44). 【0055】 Furthermore, in this embodiment, as shown in Figure 6, the ends of the first groove 43 and the second groove 44 are positioned to avoid being directly above the air intake 41 for the radiator 37. With this configuration, it is possible to prevent water discharged to the outside of the bonnet body 30 from entering the interior (storage space 28) through the air intake 41. 【0056】 Although embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as the present invention, or within an equivalent scope. 【0057】In the above embodiment, the first to third panels 31 to 33 constituting the bonnet body 30 are fixed to the body 27 using bolts 42. However, each panel 31 to 33 may be fixed to the body 27 using fixing members other than bolts 42. That is, each panel 31 to 33 only needs to be fixed to the body 27 using fixing members that require tools, and the type of fixing member and tool is not particularly limited. The tool can be a general-purpose tool conforming to JIS standards, such as a Phillips screwdriver, a flathead screwdriver, and various wrenches including box-end wrenches. The fixing member can be a general-purpose fixing member, such as a hexagonal bolt, a socket head cap screw, other polygonal bolts, a Phillips screw, or a flathead screw. Alternatively, the fixing member may be a fixing member with a special shape, and the tool may be a special tool corresponding to the fixing member with a special shape. 【0058】 In the above embodiment, the bonnet body 30 had a three-dimensional shape including upper walls 31b, 31d, 33e, a front wall 32f, rear walls 31j, 33j, a left wall 31c, and a right wall 33g. However, one or more of the front wall 32f, rear walls 31j, 33j, left wall 31c, and right wall 33g may be omitted. That is, the bonnet body 30 may have a three-dimensional shape with an upper wall and one or more walls (circumferential walls) on the front, rear, left, or right sides. Alternatively, the bonnet body 30 may consist only of the upper wall. 【0059】 (Summary) The embodiments described above include the following inventions. 【0060】 The bonnet structure according to the present invention relates to an electric construction machine that includes an electric motor as its main drive source, and comprises high-voltage equipment including equipment for supplying power to the electric motor, and a bonnet that defines a housing space for housing the high-voltage equipment. The bonnet includes a bonnet body including a plurality of panels, and fixing members that fix the plurality of panels to the body of the electric construction machine, respectively. A tool is required to attach and detach the fixing members, and each of the panels is opened by releasing the fixing members using the tool. 【0061】According to this invention, since the multiple panels constituting the bonnet body are each fixed to the body of the construction machine via fastening members that require tools, the fixing of each panel cannot be released without using tools, and the bonnet body cannot be opened. As a result, the bonnet body is difficult to open unintentionally, making it less likely for water droplets to come into contact with high-voltage equipment, and reducing the possibility of deterioration or short circuits caused by water droplets. In addition, by making the bonnet body difficult to open, the possibility of workers touching high-voltage equipment can be reduced, thereby ensuring worker safety. Furthermore, since high-voltage equipment can be exposed by separating one or more of the multiple panels, the efficiency of maintenance work on high-voltage equipment can be improved. 【0062】 In the present invention, preferably, the bonnet body has a three-dimensional shape including an upper wall and a peripheral wall extending downward from the periphery of the upper wall. When such a three-dimensional bonnet body is opened, compared to, for example, a bonnet body having only an upper wall, the high-voltage equipment is exposed over a wide area so that it can be accessed not only from above but also from the front, back, left, or right, thus improving the efficiency of maintenance work on the high-voltage equipment. 【0063】 Preferably, the housing space includes a first section and a second section where equipment other than the high-voltage equipment is installed, and a third section where the high-voltage equipment is installed, and the bonnet body includes a plurality of panels, a first panel covering the first section, a second panel covering the second section, and a third panel covering the third section. With this configuration, when opening the bonnet, maintenance of the high-voltage equipment can be performed by removing only the third panel covering the third section where the high-voltage equipment is installed. In other words, it is not necessary to remove all of the first to third panels for maintenance of the high-voltage equipment, and the efficiency of maintenance work can be improved. 【0064】Preferably, the bonnet body has a pair of panels consisting of two of the first to third panels, connected such that adjacent edges overlap in the vertical direction. With this configuration, the order in which the panels are attached and removed can be defined. Therefore, the opportunities for panels covering areas that require infrequent maintenance or panels that do not need to be removed to be removed can be reduced. 【0065】 Preferably, one panel in the pair of panels covers equipment that requires relatively infrequent maintenance, and the other panel covers equipment that requires relatively frequent maintenance and is positioned above the first panel. With this configuration, when performing maintenance on equipment that requires frequent maintenance, it becomes unnecessary to remove the panel covering the equipment that requires less maintenance (the first panel), thus reducing the labor involved in removing the panels. The maintenance frequency is, for example, described in the instruction manual or maintenance procedure manual for construction machinery. 【0066】 Preferably, the equipment requiring relatively frequent maintenance is the high-voltage equipment, and the other panel is the third panel. With this configuration, since the third panel covering the high-voltage equipment requiring frequent maintenance is positioned relatively higher, the high-voltage equipment can be maintained without removing the other panels, thereby improving the efficiency of maintenance work. 【0067】 Preferably, the edge of one panel in the pair of panels is positioned below the edge of the other panel in the pair of panels, and the edge of the one panel has a gutter shape that extends along the edge of the other panel, and extends to the peripheral edge of the bonnet body with its height gradually or in stages decreasing. With this configuration, rainwater and other water droplets falling on the bonnet body are quickly discharged to the outside of the bonnet body via the gutter. 【0068】Preferably, the end of the gutter-shaped edge extending to the periphery of the bonnet body is positioned to avoid directly above the air intake for the radiator of the electric construction machine. With this configuration, it is possible to prevent water discharged from the end of the gutter to the outside of the bonnet body from being drawn into the interior through the air intake. 【0069】 This invention can be usefully utilized in the field of electric construction machinery.

Claims

1. A bonnet structure for an electric construction machine that includes an electric motor as its main drive source, comprising: high-voltage equipment including equipment for supplying power to the electric motor; and a bonnet defining a housing space for housing the high-voltage equipment, wherein the bonnet includes a bonnet body including a plurality of panels; and fixing members for fixing the plurality of panels to the body of the electric construction machine, wherein a tool is required to attach and detach the fixing members, and each of the panels is opened by releasing the fixing members using the tool.

2. The bonnet structure for an electric construction machine according to claim 1, wherein the bonnet body has a three-dimensional shape including an upper wall and a peripheral wall extending downward from the periphery of the upper wall.

3. The bonnet structure for an electric construction machine according to claim 1 or 2, wherein the housing space includes a first section and a second section in which equipment other than the high-voltage equipment is installed, and a third section in which the high-voltage equipment is installed, and the bonnet body includes, as a plurality of panels, a first panel covering the first section, a second panel covering the second section, and a third panel covering the third section.

4. The bonnet structure for an electric construction machine according to claim 3, wherein the bonnet body has a pair of panels consisting of two of the first to third panels, connected such that adjacent edges overlap in the vertical direction.

5. The bonnet structure for an electric construction machine according to claim 4, wherein one panel in the pair of panels covers equipment that requires relatively infrequent maintenance, and the other panel in the pair of panels covers equipment that requires relatively frequent maintenance and is positioned above the first panel.

6. The bonnet structure for an electric construction machine according to claim 5, wherein the equipment requiring relatively frequent maintenance is the high-voltage equipment, and the other panel is the third panel.

7. The bonnet structure for an electric construction machine according to any one of claims 4 to 6, wherein the edge of one panel in the pair of panels is positioned below the edge of the other panel in the pair of panels, and the edge of the one panel has a gutter shape that extends along the edge of the other panel, and extends to the peripheral edge of the bonnet body with its height gradually or in stages decreasing.

8. The bonnet structure for an electric construction machine according to claim 7, wherein the end of the gutter-shaped edge portion extending to the periphery of the bonnet body is positioned to avoid being directly above the air intake for the radiator of the electric construction machine.

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