Electric work machine

Abstract

The present invention is provided with: a plurality of devices including batteries (63); a cab (22) having an opening (23) formed in the rear side surface (22B); and a loading section (21B) where the plurality of devices are placed. The loading section is arranged behind the cab and has a shape that extends further than the cab to one side in the left-right direction. The plurality of devices include first devices (64, 65) and a second device (69) arranged below the first devices, and the first devices and the second device are arranged such that the ends of the first devices on the other side in the left-right direction are shifted toward the one side relative to the end of the second device on the other side.

Description

Electric working machine

[0001] The present disclosure relates to an electric working machine.

[0002] In a working machine such as a hydraulic excavator, an electric working machine that drives a working device with electric power is known.

[0003] For example, Patent Document 1 discloses a working machine having a hydraulic actuator that operates a boom, an arm, etc., a hydraulic pump that supplies hydraulic pressure to the hydraulic actuator, an electric motor that drives the hydraulic pump, and a battery that supplies electric power to the electric motor. Further, Patent Document 1 discloses a structure in which a battery housing portion is provided behind the cab, and a plurality of batteries are stored in a state of being stacked in the vertical direction in the battery housing portion.

[0004] In order to operate an electric working machine for a long time, it is necessary to increase the capacity of the battery. In the configuration of Patent Document 1, since the batteries are stacked in the vertical direction as described above, by stacking the batteries higher, the number of batteries mounted and thus the capacity of the battery can be increased without increasing the horizontal dimension of the electric working machine. However, simply increasing the stacking amount of the batteries increases the vertical dimension of the occupied area of the batteries and their peripheral devices, resulting in a problem that the rear visibility of the operator is reduced because the rear view from the cab is covered by the batteries or the like.

[0005] Japanese Unexamined Patent Application Publication No. 2008-42408

[0006] The present disclosure has been made to solve the above problems, and an object thereof is to provide an electric working machine that can ensure the installation space for high-voltage devices including a battery and improve the rear visibility of the operator.

[0007] The electric work machine in this disclosure is an electric work machine having a work device driven by electric power, comprising a plurality of devices arranged in a vertical direction, a cab having a rear side with an opening formed therein to form a driver's cab, and a mounting section on which the plurality of devices are mounted, wherein at least a portion of the plurality of devices includes a battery, the mounting section is located behind the cab and has a shape that extends to one side in the left-right direction from the cab, and the plurality of devices include a first device having an upper surface located above the lower edge of the opening and a second device adjacent to the first device below it, and the first and second devices are arranged such that the other end of the first device in the left-right direction is offset to the one side relative to the other end of the second device.

[0008] Figure 1 is a schematic side view showing an electric work machine according to the first embodiment of this disclosure. Figure 2 is a schematic perspective view showing a part of the electric work machine according to the first embodiment, viewed from the left rear. Figure 3 is a schematic perspective view showing a part of the electric work machine according to the first embodiment, viewed from the right rear. Figure 4 is a schematic plan view showing the electric work machine according to the first embodiment with the cover removed. Figure 5 is a schematic rear view showing the electric work machine according to the first embodiment with the rear side of the outer wall removed. Figure 6 is a schematic cross-sectional view taken along the line VI-VI in Figure 5. Figure 7 is a plan view corresponding to Figure 4 of the electric work machine according to the second embodiment of this disclosure. Figure 8 is a rear view corresponding to Figure 5 of the electric work machine according to the second embodiment. Figure 9 is a schematic cross-sectional view corresponding to Figure 6 of the electric work machine according to the second embodiment. Figure 10 is a rear view corresponding to Figure 5 of the electric work machine according to the third embodiment of this disclosure.

[0009] Embodiments of this disclosure will be described below with reference to the attached drawings. Note that the following embodiments are merely examples of the disclosure and do not limit the technical scope of this disclosure.

[0010] (Overall Configuration) An electric work machine 100 according to the first embodiment of this disclosure will be described with reference to the drawings. Figure 1 is a schematic side view of the electric work machine 100. Figures 2 and 3 are schematic perspective views showing a part of the electric work machine 100. Figure 4 is a schematic plan view showing the electric work machine 100 with the cover 40, which will be described later, removed. Figure 5 is a schematic rear view showing the electric work machine 100 with the rear side of the outer wall 31, which will be described later, removed. Figure 6 is a schematic cross-sectional view taken along the line VI-VI in Figure 5.

[0011] As shown in Figure 1, the electric work machine 100 of the first embodiment is an excavator. The electric work machine 100 is a hydraulic excavator driven by electric power. In other words, the electric work machine 100 is an electric hydraulic excavator that has a motor 61, and a hydraulic pump 51 rotated by the motor 61 supplies hydraulic fluid to hydraulic actuators such as a travel motor (not shown) that moves the work device 3 and the lower traveling body 1, and a slewing motor (not shown) that rotates the upper slewing body 2, thereby driving the hydraulic actuators. Hereinafter, the electric work machine 100 will be referred to as the electric hydraulic excavator 100.

[0012] The electric hydraulic excavator 100 comprises a lower traveling body 1, an upper rotating body 2 supported by the lower traveling body 1, and a work device 3 supported by the upper rotating body 2. As will be described later, the upper rotating body 2 is provided with a driver's seat 30 on which an operator (worker) can sit. Hereafter, the front-rear direction and left-right direction as seen from the operator seated in this driver's seat 30 will be simply described as the front-rear direction and the left-right direction, respectively. Also, the up-down direction when the electric hydraulic excavator 100 is installed on the ground G will be simply referred to as the up-down direction. The front-rear direction as seen from the operator corresponds to the "front-rear direction" in this disclosure, and the left-right direction as seen from the operator corresponds to the "left-right direction" in this disclosure.

[0013] The lower traveling body 1 is equipped with a pair of crawlers 11, 11. These crawlers 11 operate to allow the lower traveling body 10 to travel on the ground G. In the first embodiment, the lower traveling body 1 is provided with a dozer blade 12.

[0014] The working device 3 includes a boom 4, an arm 5, and a bucket 6. The boom 4 is supported by an upper slewing body 2 so as to be able to be raised and lowered. The boom 4 is supported by the upper slewing body 2 in a position extending forward when the direction of travel of the crawler 11 and the electric hydraulic excavator 100 coincides with the front-rear direction (front-rear direction as seen from the operator), and the forward direction of travel coincides with the forward direction as seen from the operator. The arm 5 is attached to the tip of the boom 4 so as to be able to rotate vertically relative to the boom 4. The bucket 6 is attached to the tip of the arm 5 so as to be able to rotate vertically relative to the arm 5. The bucket 6 is, for example, a tip attachment for performing excavation work.

[0015] The working device 3 includes a boom cylinder 7, an arm cylinder 8, and a bucket cylinder 9. These cylinders 7, 8, and 9 are each hydraulic cylinders. The boom cylinder 7 extends and retracts to rotate the boom 4 in the luffing direction by receiving hydraulic fluid discharged from a hydraulic pump 51. The arm cylinder 8 extends and retracts to rotate the arm 5 in the vertical direction by receiving hydraulic fluid discharged from a hydraulic pump 51. The bucket cylinder 9 extends and retracts to rotate the bucket 6 in the vertical direction relative to the arm 5 by receiving hydraulic fluid discharged from a hydraulic pump 51.

[0016] The upper rotating body 2 is mounted on the lower traveling body 1 so as to be able to rotate around a rotation centerline that extends in the vertical direction. The upper rotating body 2 has a rotation frame 21. The rotation frame 21 has a substantially plate shape perpendicular to the rotation centerline. The upper rotating body 2 has a cab 22 provided on the rotation frame 21, and an outer wall 31 extending upward from the outer peripheral edge of the rotation frame 21.

[0017] The cab 22 is the part that forms the driver's compartment. Inside the cab 22 are a driver's seat 30 for the operator to sit in and various operating devices (not shown) that the operator operates.

[0018] The cab 22 is roughly rectangular in shape and includes a front wall 122A positioned in front of the driver's seat 30 and a rear wall 122B positioned behind the driver's seat 30. The front wall 122A and the rear wall 122B are roughly plate-shaped, extending vertically and horizontally, respectively. The cab 22 includes a right wall 122C connecting the right edges of the front wall 122A and the rear wall 122B, a left wall 122D connecting the left edges of the front wall 122A and the rear wall 122B, and an upper wall 122E extending across the upper edges of the front wall 122A, the rear wall 122B, the right wall 122C, and the left wall 122D to cover the area above the driver's seat 30. An opening 23 is formed in the upper part of the rear wall 122B. Hereinafter, the opening 23 formed in the rear wall 122B will be referred to as the rearward viewing window 23. Behind the rear-view window 23, a transparent plate 24 is provided to cover the rear-view window 23. The transparent plate 24 is made of, for example, a transparent glass plate. The transparent plate 24 may be a transparent resin plate instead of a glass plate. In some figures, the transparent plate 24 is not shown. In the first embodiment, the rear-view window 23 has a substantially rectangular shape that extends to the left and right. The rear wall 122B of the cab 22 corresponds to the "rear side" in this disclosure, and the rear-view window 23 corresponds to the "opening" in this disclosure.

[0019] In the first embodiment, the cab 22 is located on the left front of the slewing frame 21. Specifically, the slewing frame 21 includes a front frame 21A that constitutes its front portion and a rear frame 21B that constitutes its rear portion. The cab 22 is installed on the left side of the front frame 21A. The rear frame 21B is located behind the cab 22 and extends to a position to the right of the cab 22. More specifically, the rear frame 21B extends in the left-right direction from a position equivalent to the left end of the cab 22 to a position to the right of the cab 22. The boom 4 is supported near the left-right center of the front frame 21A, and the cab 22 is located to the left of the boom 4. Accordingly, a door is provided on the left wall 122D of the cab 22 for the operator to enter and exit the interior of the cab 22. The aforementioned rear frame 21B corresponds to the "mounting portion" in this disclosure. Furthermore, in the first embodiment, the right side in the left-right direction corresponds to "one side" of this disclosure, and the left side corresponds to "the other side."

[0020] The outer wall 31 is a plate-shaped member provided on the outer edge of the portion of the slewing frame 21 excluding the area where the cab 22 and boom 4 are installed. In the first embodiment, the rear edges of the slewing frame 21 and the rear frame 21B are curved to bulge outwards, and the corresponding outer wall 31 is also curved to bulge outwards.

[0021] In the area of ​​the slewing frame 21 excluding the area where the cab 22 and the work equipment 3 are installed, hydraulic equipment, cooling equipment, and electrical equipment are mounted, and the space above the slewing frame 21 corresponding to this area functions as a machine room R that houses each piece of equipment. Specifically, the machine room R includes the front machine room R1 located on the upper right side of the front frame 21A, and the rear machine room R2 which occupies the remaining area. The upper part of the machine room R is covered by a cover 40, and the machine room R is divided by the slewing frame 21, the outer wall 31 that covers the machine room R from the side, and the cover 40 that covers the machine room R from above. The cover 40 is detachably attached to the upper part of the outer wall 31 and covers the entire machine room R from above, and includes a front cover 41 that covers the upper part of the front machine room R1 and a rear cover 42 that covers the upper part of the rear machine room R2. The rear cover 42 has a shape that bulges upward except for the left end. Details of the rear cover 42 will be described later.

[0022] The hydraulic equipment includes a hydraulic pump 51, a hydraulic oil tank 52, and a control valve 53. The hydraulic pump 51 is a pump that supplies hydraulic oil to each of the hydraulic cylinders 7, 8, and 9 of the work device 3. The hydraulic oil tank 52 is a tank for storing hydraulic oil. The control valve 53 is a device that adjusts the amount of hydraulic oil discharged from the hydraulic pump 51 supplied to each of the hydraulic cylinders 7, 8, and 9.

[0023] The cooling equipment 70 includes a first radiator 71, a second radiator 72, an oil cooler 73, two cooling fans 74, and a coolant tank 75.

[0024] The cooling fan 74 forms a flow of cooling air within the machine room R. The cooling fan 74 has an impeller including multiple blades and a fan motor that drives the impeller, and the rotation of the impeller forms a flow of cooling air. Specifically, when the cooling fan 74 is driven, a flow of cooling air is formed that passes from outside the machine room R into the machine room R, passing through the first radiator 71 and the second radiator 72.

[0025] The oil cooler 73 is a heat exchanger for cooling the hydraulic fluid. The oil cooler 73 is installed in the oil passage connecting the control valve 53 and the hydraulic fluid tank 52. After the hydraulic fluid is discharged from the control valve 53, it is cooled by heat exchange with cooling air in the oil cooler 73 and then returned to the hydraulic fluid tank 52.

[0026] The first radiator 71 is a heat exchanger for cooling the high-voltage battery 63, which will be described later. The first radiator 71 cools the cooling water circulating between the first radiator 71 and the high-voltage battery 63 by heat exchange with cooling air, and cools the high-voltage battery 63 through this cooling water.

[0027] The second radiator 72 is a heat exchanger for cooling the junction box 64 and control box 65, which will be described later. The second radiator 72 cools the cooling water circulating between the second radiator 72 and the junction box 64 and control box 65 by heat exchange with cooling air, and cools the junction box 64 and control box 65 through this cooling water. Although not shown in the diagram, the upper rotating body 2 is equipped with passages through which the cooling water flows and a pump for transferring the cooling water.

[0028] The coolant tank 75 is a tank that stores the coolant that flows through the first radiator 71 and the second radiator 72. As will be described in more detail later, the coolant tank 75 is located at a higher position than the first radiator 71 and the second radiator 72.

[0029] The electrical equipment includes a motor 61, multiple high-voltage batteries 63, a junction box 64, a control box 65, and an inverter 62.

[0030] Motor 61 is an electric motor that drives the hydraulic pump 51. Motor 61 is, for example, a three-phase motor.

[0031] The high-voltage battery 63 is a battery that supplies power to the motor 61. Multiple high-voltage batteries 63 are identical and have the same shape, structure, and characteristics. As described above, the motor 61 is a motor that drives the hydraulic pump 51 that operates the work device 3, and therefore requires high output. In response to this, the output voltage of the high-voltage battery 63 is set to a high value. In the first embodiment, a lithium-ion battery with a rated voltage of several hundred volts is used as the high-voltage battery 63. Although not shown in the figures, in addition to the high-voltage battery 63, a lead-acid battery with a lower rated voltage is also installed in the machine room R.

[0032] The junction box 64 is a device for distributing power from a high-voltage battery 63 to multiple devices such as an inverter 62. The junction box 64 includes a circuit board to which the terminals of each wire are connected, as well as relays and fuses attached thereto.

[0033] The control box 65 is a device for controlling the charging and discharging of the high-voltage batteries 63 and monitoring the high-voltage batteries 63, and includes a CPU that performs various calculations. For example, the control box 65 adjusts the charging and discharging amount of the high-voltage batteries 63 and detects abnormalities based on the output of a voltage sensor that detects the voltage of each high-voltage battery 63.

[0034] The inverter 62 is a device that converts the DC current output from the high-voltage battery 63 into a three-phase AC current and supplies it to the motor 61, and has the function of adjusting the rotational speed of the motor 61. The inverter 62 is connected to the motor 61 and the high-voltage battery 63 via a junction box 64.

[0035] (Layout of the machine room) Next, we will explain the layout of each piece of equipment in machine room R.

[0036] As shown in Figure 4, the hydraulic pump 51, hydraulic oil tank 52, and control valve 53 are housed in the front machine room R1. In the first embodiment, the control valve 53 is located near the front end of the front machine room R1, and the hydraulic oil tank 52 is located to the left rear of the control valve 53. The hydraulic pump 51 is located to the right of the hydraulic oil tank 52. A motor 61 is also located in the front machine room R1. The motor 61 is located behind the hydraulic pump 51.

[0037] The main components of the aforementioned cooling equipment 70 (first radiator 71, second radiator 72, oil cooler 73, two cooling fans 74, and cooling water tank 75) and the main components of the electrical equipment excluding the motor 61 (multiple high-voltage batteries 63, junction box 64, control box 65, and inverter 62) are housed in the rear machine room R2.

[0038] The rear machine room R2 is provided with a first inner wall 81 and a second inner wall 82.

[0039] The first inner wall 81 is located behind the cab 22 and extends in the front-rear direction from the rear wall 122B of the cab 22 to the outer wall 31. The second inner wall 82 is a plate-shaped member. The second inner wall 82 is located approximately parallel to the first inner wall 81 at a position spaced apart to the left of it, and a passage 80 is partitioned between the first inner wall 81 and the second inner wall 82. In detail, the second inner wall 82 is located behind the cooling fan 74 and extends in the front-rear direction from the vicinity of the cooling fan 74 to the outer wall 31. In the outer wall 31, a vent 79 is provided in the portion facing the passage 80 between the first inner wall 81 and the second inner wall 82 to exhaust the cooling air formed by the cooling fan 74.

[0040] The cooling air formed by the cooling fan 74, which passes through the first radiator 71 and the second radiator 72 from outside the machine room R toward the machine room R, is led out to the outside of the machine room R and the electric hydraulic excavator 100 through the passage 80 between the first inner wall 81 and the second inner wall 82 and the exhaust port 79.

[0041] The second inner wall 82 divides the rear machine room R2 into two regions on the left and right. In the region on the right side of the second inner wall 82 in the rear machine room R2, a group of devices 60 including a high-voltage battery 63, a junction box 64, a control box 65, and a cooling water tank 75 is arranged. On the other hand, in the region on the left side of the second inner wall 82 in the rear machine room R2, a first radiator 71, a second radiator 72, an oil cooler 73, and two cooling fans 74 are arranged.

[0042] As shown in FIG. 4, the first radiator 71, the second radiator 72, the oil cooler 73, and the two cooling fans 74 are arranged in a region on the left side of the second inner wall 82 in the rear machine room R2, which is a region that overlaps with the left side portion of the cab 33 in the front-rear direction behind the cab 33.

[0043] Specifically, the first radiator 71, the second radiator 72, and the oil cooler 73 each have a substantially rectangular parallelepiped outer shape. As shown in FIGS. 4 and 5, the first radiator 71, the second radiator 72, and the oil cooler 73 are arranged in the rear machine room R2 in a posture where the longitudinal direction coincides with the vertical direction, the short-side direction coincides with the front-rear direction, and the height direction coincides with the left-right direction. The first radiator 71 is arranged at the left end of the rear machine room R2, and the oil cooler 73 and the second radiator 72 are arranged side by side in the front-rear direction to its right. As shown in FIGS. 4 to 6, the two cooling fans 74 have the same shape as each other and each exhibit a substantially disk shape. The two cooling fans 74 are arranged to the right of the oil cooler 73 and the second radiator 72 in a posture where the thickness direction coincides with the left-right direction.

[0044] As shown in FIG. 4, the inverter 62 is arranged at the right end of the rear machine room R2. Specifically, the inverter 62 has a substantially rectangular parallelepiped outer shape. The inverter 62 is arranged in the rear machine room R2 in a posture where the height direction coincides with the left-right direction. The inverter 62 is connected to the group of devices 60 via a mounting member not shown in the figure.

[0045] As shown in Figure 4, the group of equipment 60, consisting of a high-voltage battery 63, a junction box 64, a control box 65, and a cooling water tank 75, is located in the area to the right of the second inner wall 82 in the rear machine room R2, to the right of the cooling equipment 70 and to the left of the inverter 62.

[0046] As shown in Figure 5, the equipment group 60 is mounted on the rear frame 21B in a vertically aligned configuration. Specifically, in the first embodiment, four high-voltage batteries 63 are mounted on the electric hydraulic excavator 100. These four high-voltage batteries 63 are stacked vertically. The cooling water tank 75 is positioned adjacent to the uppermost high-voltage battery 63 on its left side, and in a left-right view, it is positioned above the first, second, and third high-voltage batteries 63 from the bottom, aligned vertically with them. The vertical dimensions of the cooling water tank 75 are approximately the same as those of the adjacent high-voltage batteries 63, and the cooling water tank 75 is positioned so that almost its entirety overlaps with the high-voltage batteries 63 in a left-right view. In the first embodiment, the cooling water tank 75 is positioned above the first inner wall 81, overlapping it in a plan view. In the first embodiment, the four high-voltage batteries 63 are mounted on a mounting member 27 fixed to the upper surface 21V of the rear frame 21B.

[0047] The junction box 64 and the control box 65 are positioned above the uppermost high-voltage battery 63 and the cooling water tank 75. More specifically, the junction box 64 and the control box 65 are stacked on top of the uppermost high-voltage battery 63. Thus, in this first embodiment, the high-voltage equipment among the group of equipment 60, namely the high-voltage battery 63, the junction box 64, and the control box 65, are stacked vertically.

[0048] Here, in the first embodiment, in the vertical direction, that is, in the left - right view, the devices adjacent to the control box 65 and the junction box 64 below them include both the uppermost high - voltage battery 63 and the cooling water tank 75. Hereinafter, the device composed of the uppermost high - voltage battery 63 and the cooling water tank 75 will be referred to as the lower - side device 69 as appropriate.

[0049] As shown in FIGS. 4 and 5, the outer shapes of the high - voltage battery 63, the junction box 64, the control box 65, and the cooling water tank 75 are substantially rectangular parallelepiped.

[0050] As described above, the four high - voltage batteries 63 exhibit substantially the same shape. Each high - voltage battery 63 is stacked in a posture where its longitudinal direction (the direction with the longest dimension among length, width, and height) coincides with the left - right direction, the height direction (the direction with the shortest dimension among length, width, and height) coincides with the vertical direction, and the short - hand direction coincides with the front - rear direction. Also, the four high - voltage batteries 63 are arranged such that substantially the whole of them overlaps each other in plan view.

[0051] As shown in FIG. 5, the left - right dimension of the junction box 64 is shorter than the left - right dimension of the high - voltage battery 63. The left - right dimension of the control box 65 is shorter than the left - right dimension of the junction box 64. The left - right dimension of the cooling water tank 75 is shorter than the left - right dimension of the high - voltage battery 63.

[0052] The control box 65 is arranged such that its left end is shifted to the right with respect to the left end of the lower - side device 69. In the first embodiment, the control box 65 is arranged so as to be shifted to the right with respect to the left end of each high - voltage battery 63, and the left end of the control box 65 is shifted to the right with respect to both the left ends of the cooling water tank 75 and the high - voltage battery 63. The junction box 64 is arranged on the right side of the control box 65, and its left end is shifted to the right with respect to the left ends of the lower - side device 69, the cooling water tank 75, each high - voltage battery 63, and the left end of the control box 65.

[0053] In the first embodiment, as shown in Figures 4 and 5, the four high-voltage batteries 63 and the junction box 64 are arranged such that their right ends are at the same position X1 in the left-right direction, and the right end of the lower equipment 69 and the right end of the junction box 64 are at the same position (position X1).

[0054] As shown in Figure 4, the front-to-rear dimension of the junction box 64 is shorter than the front-to-rear dimension of the high-voltage battery 63. The front-to-rear dimension of the control box 65 is shorter than the front-to-rear dimension of the junction box 64. The front-to-rear dimension of the coolant tank 75 is shorter than the front-to-rear dimension of the high-voltage battery 63. As shown in Figure 4, the coolant tank 75 is positioned such that the position of its rear end is approximately the same as the position of the rear end of the high-voltage battery 63 in the front-to-rear direction, and the position of the front end of the coolant tank 75 is shifted to the rearward side of the position of the high-voltage battery 63.

[0055] As shown in Figure 4, the junction box 64 and the control box 65 are positioned such that their front ends are offset to the rear relative to the front ends of the four high-voltage batteries 63 and the front end of the lower equipment 69 (the front end of the uppermost high-voltage battery 63). In the first embodiment, the four high-voltage batteries 63, the cooling water tank 75, the lower equipment 69 and the junction box 64 are positioned such that the positions of their respective rear ends are the same X2 in the front-rear direction.

[0056] As described above, various devices are installed in the rear machine room R2, but as shown in Figure 5, in the first embodiment, only the cooling water tank 75 of these devices overlaps with the rearward viewing window 23 in a front view. Note that the front view refers to the rear view of the electric hydraulic excavator 100 as seen from the rear.

[0057] Specifically, the vertical dimensions of each radiator 71, 72 and oil cooler 73 are set to be shorter than the distance from the upper surface 21V of the rear frame 21B to the lower edge 23X of the rearward viewing window 23. In addition, the outer diameter of the cooling fan 74 is set to be smaller than half of the aforementioned distance. As a result, as shown in Figure 6, etc., in the vertical direction, each radiator 71, 72, oil cooler 73 and cooling fan 74 are located below the lower edge 23X of the rearward viewing window 23, and the radiators 71, 72, oil cooler 73 and cooling fan 74 do not overlap with the rearward viewing window 23 when viewed from the front.

[0058] Furthermore, the inverter 62 is located at the right end of the rear machine room R2, and the inverter 62 does not overlap with the rearward viewing window 23 when viewed from the front.

[0059] Furthermore, the first to third high-voltage batteries 63 from the bottom are all located below the lower edge 23X of the rearward viewing window 23. As a result, these three high-voltage batteries 63 do not overlap with the rearward viewing window 23 when viewed from the front. More specifically, these three high-voltage batteries 63 are located in the area to the left and right of the right edge of the rear wall, i.e., the rear side 122B, of the cab 22, but in the area to the left and right of the right edge of the rearward viewing window 23. Consequently, the three high-voltage batteries 63 overlap with the rear side 122B of the cab 22 when viewed from the front, but do not overlap with the rearward viewing window 23.

[0060] Furthermore, the upper ends of both the junction box 64 and the control box 65 are located above the lower edge 23X of the rearward viewing window 23. That is, both the junction box 64 and the control box 65 have upper surfaces located above the lower edge 23X of the rearward viewing window 23. However, the junction box 64 and the control box 65 are positioned offset to the right of the rearward viewing window 23. In the first embodiment, the junction box 64 and the control box 65 are positioned spaced to the right of the rearward viewing window 23 and the rear side surface 122B of the cab 22. As a result, the junction box 64 and the control box 65 do not overlap with the rearward viewing window 23 when viewed from the front.

[0061] Furthermore, the upper end of the lower equipment 69 is located above the lower edge 23X of the rearward viewing window 23. More specifically, the upper ends of both the cooling water tank 75 and the uppermost high-voltage battery 63 are located above the lower edge 23X. In other words, the lower equipment 69 (cooling water tank 75 and uppermost high-voltage battery 63) has an upper surface that is located above the lower edge 23X of the rearward viewing window 23.

[0062] However, similar to the three lower high-voltage batteries 63, the uppermost high-voltage battery 63 is also positioned to the right of the rear-view window 23, and the uppermost high-voltage battery 63 and the rear-view window 23 do not overlap when viewed from the front. On the other hand, the cooling water tank 75 is located to the left of the uppermost high-voltage battery 63 and overlaps with the rear-view window 23 when viewed from the front. In the first embodiment, almost the entire cooling water tank 75 overlaps with the lower right portion of the rear-view window 23.

[0063] As described above, the coolant tank 75 and the rear-view window 23 overlap in a front view, but as shown in Figure 4, the coolant tank 75 is positioned at a distance rearward from the rear-view window 23. Thus, a gap is defined in the front-rear direction between the coolant tank 75 and the rear-view window 23, that is, between the coolant tank 75 and the rear side surface 122B of the cab 22. Specifically, in a plan view, each high-voltage battery 63 is positioned in the area slightly rearward from the rear side surface 122B of the cab 22 and the rear-view window 23. In contrast, as described above, the front-rear dimension of the coolant tank 75 is shorter than that of the high-voltage battery 63 in the front-rear direction, and the position of the rear end of the coolant tank 75 is the same as that of the rear end of the high-voltage battery 63. As a result, the cooling water tank 75 and the rear side 122B of the cab 22 and the rearward viewing window 23 are separated by a relatively long distance in the front-to-back direction, and a gap is defined in the front-to-back direction between the cooling water tank 75 and the rearward viewing window 23 and the rear side 122B of the cab 22. In other words, the lower equipment 69 is positioned such that a portion of it overlaps with the rear side 122B of the cab 22 and the rearward viewing window 23 when viewed from the front, while a gap is defined in the front-to-back direction between them.

[0064] Here, in the first embodiment, each of the high-voltage batteries 63 corresponds to the "battery" in this disclosure. Also, each of the high-voltage batteries 63, the junction box 64, the control box 65, and the coolant tank 75 correspond to the "equipment" in this disclosure. Furthermore, the lower equipment 69, consisting of the coolant tank 75 and the uppermost high-voltage battery 63, corresponds to the "second equipment" and "duplicate equipment" in this disclosure, and the control box 65 and the junction box 64 each correspond to the "first equipment" in this disclosure. Also, the radiators 71, 72 and the oil cooler 73 each correspond to the "heat exchanger" in this disclosure.

[0065] (Rear Cover) The portion of the rear cover 42 that covers the cooling equipment 70 and the equipment group 60 from above has a shape in the left-right direction that corresponds to the layout of the cooling equipment 70 and the equipment group 60. That is, as shown by line X10 in Figure 5, the cooling equipment 70 and the equipment group 60 are arranged so that their upper ends are higher on the right side, and the rear cover 42 is configured so that its upper end is higher on the right side. Also, at the rear of the cab 22, as shown by line X20 in Figure 6, the equipment group 60 is arranged so that its upper end is higher on the right rear side, and the rear cover 42 at the rear of the cab 22 is configured so that its upper end is higher on the right rear side. The detailed structure of the rear cover 42 will be described below. In the first embodiment, this rear cover 42 corresponds to the "panel" of this disclosure.

[0066] As shown in Figure 6, the rear cover 42 extends rearward from a position close to the cab 22 in a side view. The rear cover 42 includes a left rear cover 42B which forms its left side and is positioned behind the cab 22, and a right rear cover 42A which forms the right side of the rear cover 42 and extends to the right from the left rear cover 42B. The upper surface of the right rear cover 42A is substantially flat, with a height position that is approximately constant at each point. As shown in Figure 5, the right rear cover 42A bulges upward more than the left rear cover 42B, and the upper end position of the right rear cover 42A is higher than the upper end position of the left rear cover 42B. In the first embodiment, the upper end position of the right rear cover 42A is approximately the same as the upper end position of the cab 22.

[0067] The left rear cover 42B is configured such that its right rear portion bulges upward. Specifically, the left rear cover 42B includes a first portion 141 which constitutes its left side and its right front portion, and a second portion 142 which constitutes the remaining right rear portion. The upper surface of the first portion 141 is substantially flat, with a height position that is substantially constant at each point. The upper end position of the first portion 141, i.e., the height position of its upper surface, is set to be approximately the same as the lower edge 23X of the rearward viewing window 23. The second portion 142 bulges upward from the upper surface of the first portion 141, and the height position of the upper end of the second portion 142 is higher than the lower edge 23X of the rearward viewing window 23. The height position of the upper end of the second portion 142 is lower than the upper end position of the right rear cover 42A.

[0068] As shown in Figure 5, in the left-right direction, the second portion 142 is located in the area to the right of the left-right center of the rearward viewing window 23. Also, as shown in Figure 6, in the front-rear direction, the second portion 142 is located in the area to the rear of the cab 22, slightly rearward from the cab 22.

[0069] The second part 142 includes a first wall portion 142A that forms its upper surface, a second wall portion 142B that forms its front surface, and a third wall portion 142C that forms its left surface. The first wall portion 142A is a roughly rectangular flat plate. As shown in Figure 6, the second wall portion 142B extends diagonally downward from the front edge of the first wall portion 142A. In detail, the upper part of the second wall portion 142B extends almost along the vertical direction, and the lower part is inclined diagonally downward from the front. Furthermore, the lower part of the second wall portion 142B is inclined such that the angle of inclination with respect to the upper surface of the first part 141 becomes steeper on the left side, and at the same height position, it is positioned further back on the left side, that is, the distance from the cab 22 increases. With the above configuration, a gap is defined in the front-to-back direction between the second wall portion 142B and the second part 142 and the rear-view window 23 and the rear side surface 122B of the cab 22, and this gap space is wider in the left-to-right direction towards the front.

[0070] As shown in Figure 5, the third wall portion 142C extends diagonally downward and to the left from the left edge of the first wall portion 142A. More specifically, the lower portion of the third wall portion 142C has a steeper inclination angle with respect to the upper surface of the first portion 141 than the upper portion, and the third wall portion 142C as a whole is formed to bulge diagonally upward and to the left when viewed from the front.

[0071] The second section 142 corresponds to the cooling water tank 75 which overlaps with the rear-view window 23 in a front view, and the cooling water tank 75 is housed inside the second section 142. In the first embodiment, the entire cooling water tank 75 and the left end of the uppermost high-voltage battery 63 are housed inside the second section 142. The right rear cover 42A corresponds to the portion of the uppermost high-voltage battery 63 excluding the left end, the junction box 64, and the control box 65, and these are housed inside the right rear cover 42A. Furthermore, below the first section 141, which is to the left of the second section 142 on the rear cover 42, the cooling equipment 70, excluding the cooling water tank 75, is arranged.

[0072] (Function, etc.) As described above, in the electric work machine according to the first embodiment, multiple high-voltage batteries 63, junction boxes 64, control boxes 65, and cooling water tanks 75 are mounted on the rear frame 21B in an orderly fashion. Therefore, the installation space for these multiple high-voltage batteries 63, junction boxes 64, control boxes 65, and cooling water tanks 75 can be secured while keeping their horizontal space occupied small. Accordingly, according to the first embodiment, it is possible to mount a large number of high-voltage batteries 63, or even large high-voltage batteries 63, while keeping the horizontal dimensions of the rear frame 21B and thus the electric hydraulic excavator 100 small, thereby realizing an electric hydraulic excavator with a compact size and large battery capacity.

[0073] Furthermore, the junction box 64 and control box 65, which are located higher than the lower edge 23X of the rearward viewing window 23, are positioned such that their left ends are shifted to the right relative to the left end of the lower equipment 69 located directly below. Therefore, the junction box 64 and control box 65 can be positioned above the lower equipment 69 and higher than the lower edge 23X of the rearward viewing window 23, while avoiding overlap between the junction box 64 and control box 65 and the rearward viewing window 23 in the front-to-back direction. Consequently, the junction box 64 and control box 65 do not obstruct the operator's view, and a wide rearward view for the operator through the rearward viewing window 23 can be secured. In other words, the operator's rearward visibility can be improved.

[0074] More specifically, in the first embodiment, in addition to the junction box 64 and control box 65, the lower equipment 69 is also positioned higher than the lower edge 23X of the rear-view window 23. However, the portion that overlaps with the rear-view window 23 in a front view is limited to the cooling water tank 75, which is part of the lower equipment 69, and only the lower right portion of the rear-view window 23 is obstructed. Therefore, most of the rear-view window 23 can be left open to the rear, improving the operator's rearward visibility. In other words, according to the first embodiment, the lower equipment 69 is positioned higher than the lower edge 23X of the rear-view window 23 in addition to the junction box 64 and control box 65, and furthermore, the lower equipment 69 is positioned to overlap with the rear-view window 23 in a front view, while still improving the operator's rearward visibility.

[0075] Furthermore, in the first embodiment, the left-right dimension of the lower device 69 is set to be larger than the left-right dimensions of the junction box 64 and the control box 65. Therefore, the junction box 64 and the control box 65 can be stably placed on top of the lower device 69. Specifically, in the first embodiment, the left-right dimension of the high-voltage battery 63, which constitutes part of the lower device 69, is set to be larger than the left-right dimensions of the junction box 64 and the control box 65, and the junction box 64 and the control box 65 are stacked on top of this high-voltage battery 63. Therefore, the junction box 64 and the control box 65 can be stably supported by the high-voltage battery 63. In addition, in the first embodiment, the front-to-back dimension of the high-voltage battery 63 is set to be larger than the left-to-right dimensions of the junction box 64 and the control box 65, which also allows them to be stably supported.

[0076] Furthermore, in the first embodiment, the cooling equipment 70 and the equipment group 60 are arranged such that their upper ends are higher on the right side, and in response to this, the rear cover 42, which is provided above the rear frame 21B and covers these devices, is configured to have a shape in which its upper end is higher on the right side.

[0077] Therefore, the area in which the rearward viewing window 23 and the rear cover 42 overlap in a front view can be kept small, and rearward visibility can be improved while providing a rear cover 42 that covers the cooling equipment 70 and the equipment group 60.

[0078] Furthermore, in the first embodiment, a gap is defined in the front-rear direction between the cooling water tank 75, which overlaps with the rear-view window 23 in a front view, and the rear-view window 23 and the rear side surface 122B of the cab 22. Correspondingly, a space is defined between the second portion 142 of the left rear cover 42B and the rear-view window 23 and the rear side surface 122B of the cab 22.

[0079] Therefore, the aforementioned gap can be secured as an escape space for the operator in an emergency. Specifically, in an emergency, the operator can break the transparent plate 24 covering the rear-view window 23 and escape through the gap to the rear-view window 23.

[0080] Furthermore, in the first embodiment, the front-to-rear dimensions of the junction box 64 and control box 65 are set to be shorter than the front-to-rear dimensions of the high-voltage battery 63 and consequently the lower equipment 69, and the front ends of the junction box 64 and control box 65 are positioned to be rearward relative to the front end of the lower equipment 69. As a result, it is possible to improve the visibility of the upper rear of the operator through the rearward viewing window 23, and to secure a wider gap between the rear side 122B of the cab 22 and the equipment as space for the operator to escape from the cab in an emergency.

[0081] Furthermore, in the first embodiment, each high-voltage battery 63, junction box 64, control box 65, and cooling water tank 75 is arranged such that their rear ends are at the same position X2 in the front-to-back direction. Therefore, in the front-to-back direction, it is possible to avoid the upper equipment protruding from the lower equipment, and the equipment can be stacked stably. In addition, the entire assembly of these devices can be brought closer to the rear side of the outer wall 31 and further back from the rearward viewing window 23, thereby improving rearward visibility.

[0082] Furthermore, in the first embodiment, the radiators 71, 72 and the oil cooler 73, which have a smaller height dimension than the equipment group 60, are located to the left of the equipment group 60, that is, on the cab 22 side.

[0083] Therefore, the space on the rear frame 21B can be effectively utilized as installation space for the equipment group 60, radiators 71 and 72, and oil cooler 73, while the equipment group 60, which has a large height dimension, can be moved further to the right from the cab 22, thereby more reliably reducing the area in which the equipment group 60 and the rearward viewing window 23 overlap when viewed from the front.

[0084] Furthermore, in the first embodiment, the vertical dimensions of each radiator 71, 72 and oil cooler 73 are set to be shorter than the distance from the upper surface 21V of the rear frame 21B to the lower edge 23X of the rearward viewing window 23. As a result, the cooling equipment 70 and the rearward viewing window 23 do not overlap when viewed from the front, and rearward visibility can be more reliably improved.

[0085] Furthermore, in the first embodiment, since the cooling water tank 75 is located above the first inner wall 81, the worker can easily access the cooling water tank 75 by removing the rear cover 42 from the outer wall 31. Also, since the cooling water tank 75 is located lower than the junction box 64 and the control box 65, it is easy to replenish the cooling water in the cooling water tank 75.

[0086] (Second Embodiment) In the first embodiment described above, a case was described in which a junction box 64 and a control box 65 are arranged side by side on the left and right, directly above the lower equipment 69. Alternatively, the junction box 64 and the control box 65 may be arranged vertically above the lower equipment 69. The electric work machine 200 according to the second embodiment of this disclosure in this arrangement will be described with reference to Figures 7 to 9. In the following description of the second embodiment, elements similar to those in the first embodiment will be denoted by the same reference numerals as in the first embodiment, and configurations that differ from the first embodiment will be described. Figure 7 is a plan view of the electric work machine according to the second embodiment, corresponding to Figure 4. Figure 8 is a rear view of the electric work machine according to the second embodiment, corresponding to Figure 5. Figure 9 is a schematic cross-sectional view of the electric work machine according to the second embodiment, corresponding to Figure 6, and is a schematic cross-sectional view taken along the line IX-IX in Figure 8.

[0087] In the second embodiment, as shown in Figures 7 and 8, the junction box 64 is stacked on top of the uppermost high-voltage battery 63, and the control box 65 is stacked on top of that. That is, the junction box 64 is positioned directly above the lower equipment 69, and the control box 65 is positioned above the junction box 64.

[0088] In the second embodiment, the junction box 64 and the control box 65 are arranged such that their longitudinal direction (the direction with the longest dimension among length, width, and height) coincides with the left-right direction, and their height direction (the direction with the longest dimension among length, width, and height) coincides with the up-down direction. In the second embodiment, the dimensions of the junction box 64 are larger than those of the control box 65 in both the left-right direction (longitudinal direction) and the front-back direction, and the lower equipment 69, junction box 64, and control box 65 are configured such that their dimensions in the left-right and front-back directions decrease in that order. In other words, these three pieces of equipment are arranged such that the upper piece of equipment has shorter dimensions in the left-right and front-back directions. Specifically, the relationship between the left-right dimension L1 and the front-rear dimension L11 of the uppermost high-voltage battery 63 included in the lower equipment 69, the left-right dimension L2 and the front-rear dimension L12 of the junction box 64, and the left-right dimension L3 and the front-rear dimension L13 of the control box 65 is L1 > L2 > L3 and L11 > L12 > L13.

[0089] In the second embodiment, the lower equipment 69, junction box 64, and control box 65 are arranged such that the upper equipment is positioned further to the right of its left end. Specifically, in the left-right direction, the left end of the junction box 64 is positioned to the right of the left ends of the lower equipment 69 and each high-voltage battery 63, and the left end of the control box 65 is positioned to the right of the left end of the junction box 64. In this second embodiment, the lower equipment 69, junction box 64, and control box 65 are arranged such that the positions of their right ends are the same position X21 in the left-right direction.

[0090] As shown in Figure 7, in the second embodiment, the lower equipment 69, junction box 64, and control box 65 are arranged such that the front end of the upper equipment is located further rearward. Specifically, in the front-to-back direction, the front end of the junction box 64 is located further rearward than the front ends of the lower equipment 69 and each high-voltage battery 63, and the front end of the control box 65 is located further rearward than the front end of the junction box 64. In this second embodiment, the lower equipment 69 (specifically the cooling water tank 75 and the uppermost high-voltage battery 63), junction box 64, and control box 65 are arranged such that their rear ends are at the same position X22 in the front-to-back direction.

[0091] In the second embodiment as well, each high-voltage battery 63 corresponds to the "battery" in this disclosure. Furthermore, the junction box 64 and the control box 65 correspond to the "first equipment," respectively, and the lower equipment 69 corresponds to the "second equipment" and the "duplicate equipment." However, if the control box 65 is considered the "first equipment," then the junction box 64 corresponds to the "second equipment," and if the junction box 64 is considered the "first equipment," then the lower equipment 69 corresponds to the "second equipment."

[0092] According to the second embodiment, the operator's rearward visibility can be improved while securing installation space for the equipment group 60, including the high-voltage battery 63, to a degree comparable to the first embodiment. Furthermore, according to the second embodiment, since the junction box 64 and the control box 65 are stacked vertically, larger junction boxes 64 and control boxes 65 can be mounted on the electric hydraulic excavator 100 compared to the first embodiment, where they are arranged side by side. In addition, according to the second embodiment, the three pieces of equipment, the lower equipment 69, the junction box 64, and the control box 65, are arranged such that the upper pieces of equipment have shorter dimensions in the left-right and front-back directions, allowing each piece of equipment to be stably mounted on the rear frame 21B. In particular, the right ends of the lower equipment 69, the junction box 64, and the control box 65 are at the same position (X21) in the left-right direction, and the rear ends are at the same position (X22) in the front-back direction. Therefore, the lower equipment is prevented from protruding from the upper equipment to the left, right, front, and rear, allowing them to be stacked stably, and the junction box 64 and control box 65 can be moved further to the right and rear from the rearward viewing window 23. Furthermore, the field of view from the upper part of the rearward viewing window 23 can be opened up, improving the operator's visibility.

[0093] (Third Embodiment) In the first and second embodiments described above, a cooling water tank 75 is positioned to the left of the uppermost high-voltage battery 63, and the left-right dimension of the lower equipment 69, consisting of the cooling water tank 75 and the uppermost high-voltage battery 63, is larger than the left-right dimension of the other high-voltage batteries 63. In other words, the left-right dimension is longest at the middle of the vertical arrangement of multiple pieces of equipment arranged vertically. Alternatively, the multiple pieces of equipment may be arranged such that the left-right dimension becomes shorter as the equipment moves upward. Furthermore, the lower equipment 69, which is positioned below the junction box 64 or control box 65, may have an upper surface that is at the same height as or lower than the lower edge 23X of the rearward viewing window 23. An electric work machine 300 according to the third embodiment of this disclosure, arranged as described above, will be explained with reference to Figure 10. In the following description of the third embodiment, elements similar to those in the first embodiment will be denoted by the same reference numerals as in the first embodiment, and configurations that differ from the first embodiment will be described. Figure 10 is a rear view of the electric work machine 300 according to the third embodiment, corresponding to Figure 5.

[0094] As shown in Figure 10, in the third embodiment, the cooling water tank 75 is located outside the viewport, and the group of equipment 60, which consists of equipment arranged in a vertical direction, is composed of multiple (three) high-voltage batteries 63, a junction box 64, and a control box 65. In the third embodiment, the upper end position, i.e., the height of the top surface, of the uppermost high-voltage battery 63 is approximately the same as the lower edge 23X of the rearward viewing window 23, and is located slightly below it. In the third embodiment, the junction box 64 overlaps with the rearward viewing window 23 when viewed from the front. However, in the third embodiment as well, the uppermost high-voltage battery 63, junction box 64, and control box 65 are arranged such that the left end of the uppermost equipment is located further to the right. That is, the junction box 64 is located further away from the rearward viewing window 23 than the high-voltage battery 63, and the control box 65 is located even further away. Consequently, the area that overlaps with the rearward-viewing window 23 is limited to the leftmost part of the junction box 64.

[0095] Furthermore, in the third embodiment, similar to the second embodiment, a junction box 64 is stacked on top of the uppermost high-voltage battery 63, and a control box 65 is stacked on top of the junction box 64. Also, in the third embodiment, similar to the first embodiment, the left-right dimension of the high-voltage battery 63 is set to be larger than the dimensions of the junction box 64 and the control box 65, and similar to the second embodiment, the left-right dimensions decrease in the order of high-voltage battery 63, junction box 64, and control box 65. Thus, in the third embodiment, in the group of equipment 60 arranged in a vertical direction, the upper equipment has a shorter left-right dimension.

[0096] According to the third embodiment, the multiple devices constituting the device group 60 are stacked such that the lower devices have a longer left-right dimension, allowing these devices to be stably stacked on the rear frame 21B. In addition, in the third embodiment, it is possible to avoid the uppermost high-voltage battery 63 overlapping with the rear-view window 23 in a front view, and the amount of overlap between the junction box 64 and the rear-view window 23 can be kept small, improving the operator's rearward visibility. The effects obtained by elements common to the first, second, and third embodiments can also be obtained in the third embodiment.

[0097] (Other variations) In the first embodiment, the case in which both the junction box 64 and the control box 65 are arranged above the lower equipment 69 (specifically, the uppermost high-voltage battery 63) was described. However, in the first embodiment, only one of these may be arranged above the lower equipment 69.

[0098] In the embodiments described above, the case in which the cab 22 is located on the left front of the slewing frame 21 was explained, but the cab 22 may also be located on the right front of the slewing frame 21. In this case, the rear frame 21B should be shaped to extend to the left from behind the cab 22, and the layout of the cooling equipment 70 and the equipment group 60 should be the symmetrical layout described in the embodiments above.

[0099] In the second embodiment described above, the lower equipment 69, junction box 64, and control box 65 are arranged such that their respective right end positions are the same; however, their positions may be different. Similarly, in the first and second embodiments described above, the lower equipment 69, junction box 64, and control box 65 are arranged such that their respective rear end positions are the same; however, their positions may be different.

[0100] In the first and second embodiments described above, a case was described in which a part of the cooling water tank 75 and a part of the rear-view window 23 overlap when viewed from the front. However, the dimensions of the cooling water tank 75 in the left-right direction may be set so as not to overlap with the rear-view window 23. This configuration can more reliably improve rearward visibility. However, according to the layout of the above embodiments, it is possible to allow overlap between the cooling water tank 75 and the rear-view window 23, thereby increasing the space occupied by high-voltage equipment while still improving rearward visibility.

[0101] In the above embodiment, the case in which the equipment arranged vertically in the rear frame 21B is a high-voltage battery, a cooling water tank 75, a junction box 64, and a control box 65 was described, but in this disclosure, the equipment only needs to include at least a high-voltage battery. In addition, the equipment may include other equipment in addition to the cooling water tank 75, high-voltage battery 63, junction box 64, and control box 65.

[0102] In the first embodiment described above, the case in which the cooling equipment 70 is arranged to the side of the equipment group 60 was explained, but the cooling equipment 70 may be arranged in other areas.

[0103] In the first embodiment described above, the tip attachment was a bucket, but the tip attachment may be other devices such as a fork, grapple, or lifting magnet.

[0104] In the first embodiment described above, the case where the electric work machine is an electric hydraulic excavator was explained, but the electric work machine is not limited to an excavator and may be other work machines such as a crane or bulldozer.

[0105] (Summary) The specific embodiments described above mainly include inventions having the following configurations.

[0106] An electric work machine according to a first aspect of the present disclosure is an electric work machine having a work device driven by electric power, comprising a plurality of devices arranged in a vertical direction, a cab having a rear side with an opening formed therein to form a driver's cab, and a mounting section on which the plurality of devices are mounted, wherein at least a portion of the plurality of devices includes a battery, the mounting section is located behind the cab and has a shape that extends to one side in the left-right direction from the cab, the plurality of devices include a first device having an upper surface located above the lower edge of the opening, and a second device adjacent to the first device below it, the first device and the second device are arranged such that the other end of the first device in the left-right direction is offset to the one side relative to the other end of the second device.

[0107] In the first embodiment, multiple devices, including batteries, are arranged vertically in a mounting section at the rear of the cab. This allows for securing installation space while keeping the horizontal space occupied by these devices small. In other words, it is possible to mount multiple devices, including a large number of batteries or large batteries, while keeping the horizontal dimensions of the electric work machine small.

[0108] Furthermore, these devices are positioned such that the other end of the first device, whose upper surface is higher than the lower edge of the opening on the rear side of the cab, is offset to one side relative to the other end of the second device, which is positioned directly below it. In other words, the first device, which may overlap with the opening on the rear side of the cab in the vertical direction and is located higher up, is positioned further away from the opening on the rear side of the cab in the horizontal direction. As a result, it is possible to avoid the opening on the rear side of the cab and the devices overlapping in a front view, or to minimize the area in which they overlap. In particular, by preventing the upper part of the opening from being blocked by the devices, the operator's field of view through the opening can be widened. Therefore, according to the first embodiment, it is possible to ensure rearward visibility for the operator through the opening while securing space for the installation of devices including the battery.

[0109] An electric work machine according to a second aspect of the present disclosure is preferably an electric work machine according to a first aspect that further comprises the following configuration: In the electric work machine according to the second aspect, the second device has a larger left-right dimension than that of the first device.

[0110] According to the second embodiment, the first device, which has a shorter dimension in the left-right direction, can be stacked on top of the second device, which has a longer dimension in the left-right direction, and the first device can be stably mounted on the mounting section.

[0111] An electric work machine according to a third aspect of the present disclosure is preferably an electric work machine according to a second aspect that further includes the following configuration: that is, the electric work machine according to the third aspect includes three or more of the aforementioned devices, and for two vertically adjacent devices, the left-right dimension of the upper device is preferably less than or equal to the left-right dimension of the lower device.

[0112] According to the third embodiment, multiple devices are stacked on the mounting unit such that the lower devices have a longer horizontal dimension, allowing these devices to be stably mounted on the mounting unit.

[0113] An electric work machine according to a fourth aspect of the present disclosure is preferably an electric work machine according to the first to third aspects, further comprising the following configurations. That is, in the electric work machine according to the fourth aspect, the second device is preferably an upper surface located above the lower edge of the opening.

[0114] According to the fourth embodiment, the operator's rearward visibility can be improved while allowing the second equipment to be positioned higher than the opening on the rear side of the cab.

[0115] An electric work machine according to a fifth aspect of the present disclosure is preferably further comprising the following configuration in addition to the electric work machine according to the first to fourth aspects. That is, in the electric work machine according to the fifth aspect, the second device is preferably positioned so as to overlap a part of the opening when viewed from the front.

[0116] According to the fifth embodiment, it is possible to allow a portion of the opening on the rear side of the cab and the second equipment to overlap in a front view while improving the operator's rearward visibility.

[0117] An electric work machine according to a sixth aspect of the present disclosure is preferably an electric work machine according to the first to third aspects, further comprising the following configurations. That is, in the electric work machine according to the sixth aspect, the second device is preferably an upper surface located at the same height as the lower edge of the opening or at a lower position than the lower edge of the opening.

[0118] According to the sixth embodiment, it is possible to prevent a portion of the opening on the rear side of the cab from overlapping with the second equipment when viewed from the front. Therefore, the operator's rearward visibility can be more reliably improved.

[0119] An electric work machine according to a seventh aspect of the present disclosure is preferably further comprising the following configuration in addition to the electric work machine according to the first to sixth aspects. That is, an electric work machine according to the seventh aspect is preferably comprising two or more of the aforementioned devices, wherein at least the first device and the second device are mounted on the aforementioned mounting portion such that the positions of one end of each of them are the same.

[0120] According to the seventh embodiment, the first and second equipment can be stably stacked on the mounting section while keeping the equipment away from the opening on the rear side of the cab.

[0121] An electric work machine according to the eighth aspect of the present disclosure is preferably further comprising the following configuration in addition to the electric work machine according to the first to seventh aspects. That is, the electric work machine according to the eighth aspect is preferably provided with a panel that is provided above the mounting portion described above and covers the entire equipment, and the panel is preferably shaped such that the upper end position is higher on one side in the left-right direction.

[0122] According to the eighth aspect, a panel can be placed along the top surface of a group of multiple devices, thereby avoiding the overlap between the opening on the rear side of the cab and the panel in a front view, or minimizing the area in which they overlap.

[0123] An electric work machine according to the ninth aspect of the present disclosure is preferably further comprising the following configuration in addition to the electric work machine according to the first to eighth aspects. That is, in the electric work machine according to the ninth aspect, the plurality of devices preferably include overlapping devices that are positioned such that at least a portion of them overlap the rear side of the cab in a front view, and the overlapping devices have a shape that divides a gap in the front-rear direction between the overlapping devices and the rear side of the cab.

[0124] According to the ninth aspect, equipment (overlapping equipment) can be positioned in a location that overlaps with the rear side of the cab in the front-rear direction, while the gap between this equipment and the rear side of the cab can be secured as a space for the operator to escape through the opening in the rear side of the cab in an emergency.

[0125] An electric work machine according to the tenth aspect of the present disclosure is preferably further comprising the following configuration in addition to the electric work machine according to the first to ninth aspects. That is, in the electric work machine according to the tenth aspect of claim, the second device is set to have dimensions that are larger in the front-rear direction than those of the first device, and the first device and the second device are preferably arranged such that the front end of the first device is offset to the rearward side relative to the front end of the second device.

[0126] According to the tenth embodiment, the upper part of the operator's field of view through the opening on the rear side of the cab can be widened, improving the operator's visibility, and the gap between the rear side of the cab and the equipment can be made wider to provide space for the operator to escape from the cab in an emergency.

[0127] An electric work machine according to the eleventh aspect of the present disclosure is preferably further comprising the following configuration in addition to the electric work machine according to the first to tenth aspects. That is, in the electric work machine according to the aspect of claim 11, it is preferable that two or more of the aforementioned devices are provided, and at least the first device and the second device are mounted on the aforementioned mounting part such that the positions of their respective rear ends are the same.

[0128] According to the eleventh embodiment, the first and second equipment can be stably stacked on the mounting section while keeping them away from the rear opening on the side of the cab.

[0129] An electric work machine according to a twelfth aspect of the present disclosure is preferably further comprising the following configuration in addition to the electric work machine according to the first to eleventh aspects. That is, the electric work machine according to the twelfth aspect is preferably equipped with a heat exchanger for cooling at least some of the equipment, wherein the heat exchanger has a shape in which its height dimension is smaller than the height dimension of the equipment group consisting of a plurality of the equipment, and is mounted on the aforementioned mounting part on the other side in the left-right direction of the equipment group.

[0130] According to the twelfth embodiment, the space on the mounting section can be used as installation space for multiple pieces of equipment and heat exchangers. Moreover, the heat exchangers, which are lower than the group of equipment, are positioned on the other side of the group of equipment and at the rear of the cab, so that the group of equipment is positioned further away from the cab. As a result, overlap between the heat exchangers and the group of equipment and the rear side window of the cab can be avoided or the overlapping area can be more reliably reduced when viewed from the front.

[0131] An electric work machine according to a thirteenth aspect of the present disclosure is preferably an electric work machine according to a twelfth aspect that further comprises the following configuration. That is, in the electric work machine according to the thirteenth aspect, the height dimension of the heat exchanger is preferably smaller than the distance from the mounting portion described above to the lower edge of the opening.

[0132] According to the 13th embodiment, the overlap between the heat exchanger and the opening on the rear side of the cab is avoided when viewed from the front, thereby ensuring that the operator's rearward visibility through the opening is more reliably improved.

Claims

1. An electric work machine having a work device driven by electric power, comprising: a plurality of devices arranged in a vertical direction; a cab having a rear side with an opening formed thereon to form a driver's compartment; and a mounting section on which the plurality of devices are mounted, wherein at least a portion of the plurality of devices includes a battery; the mounting section is located behind the cab and has a shape that extends to one side in the left-right direction from the cab; the plurality of devices include a first device having an upper surface located above the lower edge of the opening and a second device adjacent to the first device below it; and the first and second devices are arranged such that the other end of the first device in the left-right direction is offset to the one side relative to the other end of the second device.

2. An electric work machine according to claim 1, characterized in that the second device has a larger left-right dimension than that of the first device.

3. An electric work machine according to claim 2, comprising three or more of the aforementioned devices, wherein, for two adjacent devices located vertically, the left-right dimension of the upper device is less than or equal to the left-right dimension of the lower device.

4. An electric work machine according to claim 1, characterized in that the second device has an upper surface located above the lower edge of the window.

5. An electric work machine according to claim 4, characterized in that the second device is positioned so as to overlap a part of the opening when viewed from the front.

6. An electric work machine according to claim 1, characterized in that the second device has an upper surface located at the same height as the lower edge of the opening or at a lower position than the lower edge of the opening.

7. An electric work machine according to claim 1, characterized in that it comprises two or more of the aforementioned devices, and at least the first device and the second device are mounted on the aforementioned mounting portion such that the positions of one end of each of them are the same.

8. An electric work machine according to claim 1, characterized in that it is provided above the mounting portion and covers the entire equipment, and the panel has a shape in which the upper end position is higher on one side in the left-right direction.

9. An electric work machine according to claim 1, wherein the plurality of devices include overlapping devices that are positioned such that at least a portion of them overlaps with the rear side of the cab when viewed from the front, and the overlapping devices have a shape that creates a gap in the front-rear direction between the overlapping devices and the rear side of the cab.

10. An electric work machine according to claim 1, characterized in that the second device is set to have a dimension in the front-rear direction that is larger than that of the first device, and the first device and the second device are arranged such that the front end of the first device is offset to the rearward relative to the front end of the second device.

11. An electric work machine according to claim 1, characterized in that it comprises two or more of the aforementioned devices, and at least the first device and the second device are mounted on the aforementioned mounting unit such that the positions of their respective rear ends are the same.

12. An electric work machine according to any one of claims 1 to 11, comprising a heat exchanger for cooling at least some of the equipment, wherein the heat exchanger has a shape in which its height dimension is smaller than the height dimension of the equipment group consisting of a plurality of the equipment, and is mounted on the aforementioned mounting part on the other side in the left-right direction of the equipment group.

13. An electric work machine according to claim 12, characterized in that the height dimension of the heat exchanger is smaller than the distance from the mounting portion to the lower edge of the opening.

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