Electric work machinery

Abstract

To provide an electrically-driven working machine capable of stably supporting a battery unit on a body frame even under vibration conditions.SOLUTION: A hydraulic shovel as an electrically-driven working machine includes an electric motor, a body frame, a battery unit for storing electric power to drive the electric motor, and a fixing mechanism for fixing the battery unit to the machine frame. The fixing mechanism has an upper plate and a lower plate for sandwiching the battery in the vertical direction, and a support part for supporting the lower plate on the body frame.SELECTED DRAWING: Figure 3

Description

Technical Field

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

Background Art

[0002] Conventionally, various swing working machines equipped with an electric motor have been proposed. The electric motor is driven by electric power supplied from a battery unit. The battery unit is supported on the swing table of the swing working machine. For example, the swing working machine of Patent Document 1 includes a standing frame that supports the battery unit. The standing frame has a first standing portion and a second standing portion. The first standing portion stands on the upper part of the swing table and supports one side surface (for example, the left side surface) of the battery unit. The second standing portion stands on the upper part of the swing table and supports the other side surface (for example, the right side surface) of the battery unit.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Considering that the swing working machine is used on uneven ground and vibrates, it is desirable that the battery unit be supported on the swing table (machine body frame) integrally with the standing frame. In the configuration of supporting the battery unit from the left and right directions on the swing table as in Patent Document 1, since the upper surface of the battery unit is not supported at all, the integrality of the battery unit and the standing frame is insufficient, and there is room for improvement in stably supporting the battery unit against vibration.

[0005] The present invention has been made to solve the above problems, and an object thereof is to provide an electric working machine capable of stably supporting a battery unit on a machine body frame even when vibration occurs. [Means for solving the problem]

[0006] An electric work machine according to one aspect of the present invention comprises an electric motor, a machine frame, a battery unit for storing power to drive the electric motor, and a fixing mechanism for fixing the battery unit to the machine frame, wherein the fixing mechanism has an upper plate and a lower plate that sandwich the battery unit from above and below, and a support part that supports the lower plate on the machine frame. [Effects of the Invention]

[0007] Even when vibrations occur, the battery unit can be stably supported on the aircraft frame. [Brief explanation of the drawing]

[0008] [Figure 1] This is a side view showing the schematic configuration of a hydraulic excavator, which is an example of an electric work machine according to one embodiment of the present invention. [Figure 2] This is a schematic block diagram showing the electrical and hydraulic system configurations of the above-mentioned hydraulic excavator. [Figure 3] This is a perspective view of the engine room of the hydraulic excavator shown above, taken from a diagonal front angle. [Figure 4] This is a perspective view of the engine room shown above, taken from a diagonal rearward angle. [Figure 5] This is a plan view showing the arrangement of the battery unit on the base plate. [Figure 6] This is a cross-sectional view of the first connecting member. [Figure 7] This is a cross-sectional view of the second connecting member. [Figure 8] This is a cross-sectional view of the third connecting member. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below with reference to the drawings.

[0010] [1. Electric working machines] Figure 1 is a side view showing the schematic configuration of a hydraulic excavator (electric excavator) 1, which is an example of an electric work machine of this embodiment. The hydraulic excavator 1 comprises a lower traveling body 2, a work machine 3, and an upper rotating body 4.

[0011] Here, direction is defined as follows: The direction in which the operator (driver, operator) seated in the driver's seat 41a of the upper slewing body 4 faces forward is defined as forward, and the opposite direction is defined as rear. Therefore, when the upper slewing body 4 is not slewing relative to the lower traveling body 2 (slewing angle 0°), the longitudinal direction of the upper slewing body 4 coincides with the direction in which the lower traveling body 2 moves forward and backward. Also, the left side as seen from the perspective of the operator seated in the driver's seat 41a is defined as "left," and the right side as "right." Furthermore, the direction of gravity perpendicular to the longitudinal and left-right directions is defined as the up-down direction, with the upstream side of the direction of gravity being defined as "up," and the downstream side being defined as "down." In the drawing, the hydraulic excavator 1 is shown with the upper slewing body 4 not slewing relative to the lower traveling body 2. Also, in the drawing, the forward direction is indicated by the symbol "F," the rear by "B," the right by "R," the left by "L," the upper by "U," and the lower by "D," as needed.

[0012] The lower travel body 2 comprises a pair of left and right crawlers 21 and a pair of left and right travel motors 22. Each travel motor 22 is a hydraulic motor. The left and right travel motors 22 drive the left and right crawlers 21 respectively, allowing the hydraulic excavator 1 to move forward and backward. The lower travel body 2 is equipped with a blade 23 for leveling work and a blade cylinder 23a. The blade cylinder 23a is a hydraulic cylinder that rotates the blade 23 in the vertical direction.

[0013] The work machine 3 comprises a boom 31, an arm 32, and a bucket 33. By independently driving the boom 31, arm 32, and bucket 33, excavation work such as soil and sand can be performed.

[0014] The boom 31 is rotated by the boom cylinder 31a. The base end of the boom cylinder 31a is supported at the front part of the upper revolving body 4 and is movable in a telescopic manner. The arm 32 is rotated by the arm cylinder 32a. The base end of the arm cylinder 32a is supported at the tip of the boom 31 and is movable in a telescopic manner. The bucket 33 is rotated by the bucket cylinder 33a. The base end of the bucket cylinder 33a is supported at the tip of the arm 32 and is movable in a telescopic manner. The boom cylinder 31a, the arm cylinder 32a, and the bucket cylinder 33a are constituted by hydraulic cylinders.

[0015] The upper revolving body 4 is located above the lower traveling body 2 and is provided so as to be rotatable with respect to the lower traveling body 2 via a slewing bearing (not shown). In the upper revolving body 4, a cab 41, a slewing frame 42, a slewing motor 43, an engine room 44, etc. are arranged. The upper revolving body 4 rotates via the slewing bearing by the drive of the slewing motor 43 which is a hydraulic motor. The hydraulic excavator 1 includes the slewing frame 42 as the body frame.

[0016] A hydraulic pump 71 (see FIG. 2) is arranged in the upper revolving body 4. The hydraulic pump 71 is driven by an electric motor 61 (see FIG. 2) inside the engine room 44. The hydraulic pump 71 supplies hydraulic oil (pressure oil) to hydraulic motors (for example, left and right traveling motors 22, slewing motor 43), and hydraulic cylinders (for example, blade cylinder 23a, boom cylinder 31a, arm cylinder 32a, bucket cylinder 33a). The hydraulic motors and hydraulic cylinders driven by the supply of hydraulic oil from the hydraulic pump 71 are collectively called hydraulic actuators 73 (see FIG. 2).

[0017] A driver's seat 41a is arranged in the cab 41. Various levers 41b are arranged around the driver's seat 41a. When the operator sits on the driver's seat 41a and operates the lever 41b, the hydraulic actuator 73 is driven. Thereby, the traveling of the lower traveling body 2, the ground leveling work by the blade 23, the excavation work by the working machine 3, the slewing of the upper revolving body 4, etc. can be performed.

[0018] A battery unit 53 is arranged in the upper swing body 4. That is, the hydraulic excavator 1 includes the battery unit 53. The battery unit 53 is, for example, composed of a lithium-ion battery unit and stores electric power for driving the electric motor 61. The battery unit 53 may be configured by unitizing a plurality of batteries, or may be composed of a single battery cell. Further, a power supply port (not shown) is provided in the upper swing body 4. The power supply port and the commercial power supply 51 which is an external power source are connected via a power supply cable 52. Thereby, the battery unit 53 can be charged.

[0019] A lead battery 54 is further provided in the upper swing body 4. The lead battery 54 outputs a DC voltage of a low voltage (for example, 12V). The output from the lead battery 54 is supplied as a control voltage to, for example, a system controller 67 (see FIG. 2), a blower fan (not shown), etc.

[0020] The hydraulic excavator 1 may have a configuration in which hydraulic devices such as a hydraulic actuator 73 and an actuator driven by electric power are used in combination. Examples of the actuator driven by electric power include an electric travel motor, an electric cylinder, and an electric swing motor.

[0021] 〔2. Configuration of Electrical System and Hydraulic System〕 FIG. 2 is a block diagram schematically showing the configuration of the electrical system and the hydraulic system of the hydraulic excavator 1. The hydraulic excavator 1 includes an electric motor 61, a charger 62, an inverter 63, a PDU (Power Drive Unit) 64, a junction box 65, a DC-DC converter 66, and a system controller 67. The system controller 67 is composed of an electronic control unit also called an ECU (Electronic Control Unit) and performs electrical control of each part of the hydraulic excavator 1.

[0022] The electric motor 61 is driven by power supplied from the battery unit 53 via the junction box 65 and inverter 63. The electric motor 61 consists of a permanent magnet motor or an induction motor. The electric motor 61 is mounted on the slewing frame 42.

[0023] The charger 62 converts the AC voltage supplied from the commercial power supply 51 shown in Figure 1 via the power supply cable 52 into a DC voltage. The inverter 63 converts the DC voltage supplied from the battery unit 53 into an AC voltage and supplies it to the electric motor 61. This causes the electric motor 61 to rotate. The supply of AC voltage (current) from the inverter 63 to the electric motor 61 is performed based on a rotation command output from the system controller 67.

[0024] The PDU64 is a battery control unit that controls the input and output of the battery unit 53 by controlling an internal battery relay. The junction box 65 is composed of a charger relay, an inverter relay, a fuse, etc. The voltage output from the charger 62 is supplied to the battery unit 53 via the junction box 65 and the PDU64. The voltage output from the battery unit 53 is supplied to the inverter 63 via the PDU64 and the junction box 65.

[0025] The DC-DC converter 66 steps down the high-voltage (e.g., 300V) DC voltage supplied from the battery unit 53 via the junction box 65 to a low voltage (e.g., 12V). The voltage output from the DC-DC converter 66 is supplied to the system controller 67, the blower fan, etc., similar to the output from the lead-acid battery 54.

[0026] Multiple hydraulic pumps 71 are connected to the rotating shaft (output shaft) of the electric motor 61. The multiple hydraulic pumps 71 include variable displacement pumps and fixed displacement pumps. In Figure 2, only one hydraulic pump 71 is shown as an example. Each hydraulic pump 71 is connected to a hydraulic fluid tank 74 that contains (stores) hydraulic fluid. The hydraulic pumps 71 supply hydraulic fluid from the hydraulic fluid tank 74 to the hydraulic actuator 73 via a control valve 72. This drives the hydraulic actuator 73. The control valve 72 is a directional control valve that controls the flow direction and flow rate of the hydraulic fluid supplied to the hydraulic actuator 73.

[0027] [3. Regarding securing the battery unit] Next, the fixing mechanism for the battery unit 53 described above will be explained. Figure 3 is a perspective view of the engine room 44 of the hydraulic excavator 1, viewed from the front at an angle. Figure 4 is a perspective view of the engine room 44, viewed from the rear at an angle.

[0028] As shown in these figures, the hydraulic excavator 1 is equipped with a fixing mechanism 80. The fixing mechanism 80 is a mechanism for fixing the battery unit 53 to the slewing frame 42. In this embodiment, the hydraulic excavator 1 is equipped with multiple battery units 53. Therefore, the fixing mechanism 80 fixes multiple battery units 53 to the slewing frame 42.

[0029] The fixing mechanism 80 includes an upper plate 81 and a lower plate 82, and a support portion 83. The upper plate 81 and the lower plate 82 sandwich a plurality of battery units 53 from above and below. The upper plate 81 and the lower plate 82 are connected by a connecting member 84, which will be described later.

[0030] The upper plate 81 is located above the multiple battery units 53. The lower plate 82 is located below the multiple battery units 53. The multiple battery units 53 and the PDU 64 are connected by connecting cables CA. In particular, the multiple battery units 53 are connected in series, parallel, or a combination of series and parallel.

[0031] Figure 5 is a plan view showing the arrangement of the battery units 53 on the lower plate 82 with the upper plate 81, connecting member 84, and connecting cable CA removed. Four battery units 53 of the same size are arranged on the lower plate 82. For example, two battery units 53 are connected in series to form one pair, and the remaining two battery units 53 are also connected in series to form one pair. Each pair is then connected in parallel. Note that the connection method of the four battery units is not limited to the above example. Also, the number of battery units 53 is not limited to the above four; at least one battery unit 53 is required.

[0032] In this embodiment, the multiple battery units 53 are positioned parallel to each other in one direction on the lower plate 82, and are also positioned in a direction perpendicular to that direction. For example, the multiple battery units 53 are positioned parallel to each other in the left-right direction, which is the one direction mentioned above, and are also positioned in a front-back direction perpendicular to that direction on the lower plate 82.

[0033] Here, if we are to distinguish between the four battery units 53 described above, they will be referred to in order from front to rear as the first battery unit 53A, the second battery unit 53B, the third battery unit 53C, and the fourth battery unit 53D. The PDU 64 described above is located in front of the first battery unit 53A. The lower surface of the PDU 64 is fixed to the support stay 64a (see Figure 3). The support stay 64a is fixed to the lower plate 82.

[0034] As shown in Figure 5, the first battery unit 53A and the second battery unit 53B are positioned on the lower plate 82 at the same location in the left-right direction (without being offset from each other in the left-right direction). The third battery unit 53C is positioned on the lower plate 82, shifted to the right of the second battery unit 53B. The fourth battery unit 53D is positioned on the lower plate 82, shifted even further to the right of the third battery unit 53C.

[0035] Therefore, it can be said that of the four battery units 53, two battery units 53 (the third battery unit 53C and the fourth battery unit 53D) are positioned on the lower plate 82 offset from the other battery units 53 (the first battery unit 53A and the second battery unit 53B) in one direction (left-right direction). Note that only one of the multiple battery units 53 may be positioned offset in one direction. In other words, in this embodiment, at least one of the multiple battery units 53 is positioned on the lower plate 82 offset from the other battery units 53 in one direction.

[0036] In this arrangement of multiple battery units 53, the left ends of the first battery unit 53A to the fourth battery unit 53D are positioned almost along the edge 42a (see Figure 5) of the slewing frame 42, from the left side to the rear end. By positioning each battery unit 53 as close as possible to the edge 42a of the slewing frame 42 within the engine room 44, the space within the engine room 44 is effectively utilized.

[0037] From the viewpoint of improving the integration between each battery unit 53 and the upper plate 81 and lower plate 82, it is desirable that the upper surface 53S1 (see Figure 5) of each battery unit 53 is in contact with and fixed to the upper plate 81 (see Figure 3), and the lower surface 53S2 (see Figure 3) of each battery unit 53 is in contact with and fixed to the lower plate 82.

[0038] From the perspective of facilitating the replacement of each battery unit 53 due to lifespan, malfunction, etc., it is desirable that the upper surface 53S1 of each battery unit 53 is fixed to the upper plate 81, and the lower surface 53S2 of each battery unit 53 is fixed to the lower plate 82, using bolts. With bolt fastening, it is also easy to release the fastenings between the two.

[0039] Each battery unit 53 may be arranged on the lower plate 82 parallel to the front-to-back direction and side-by-side in the left-to-right direction. Alternatively, each battery unit 53 may be arranged on the lower plate 82 parallel to a diagonal direction intersecting the left-to-right direction and side-by-side in a direction perpendicular to the aforementioned diagonal direction. Furthermore, each battery unit 53 may be stacked vertically on the lower plate 82.

[0040] The support portion 83 supports the lower plate 82 on the swivel frame 42. For example, three support portions 83 are provided on the swivel frame 42. In other words, the lower plate 82 is supported on the swivel frame 42 by three support portions 83. Note that the number of support portions 83 is not particularly limited to three.

[0041] As a measure to prevent vibration of each battery unit 53, vibration-damping rubber or the like may be placed between each battery unit 53 and the lower plate 82. However, prioritizing the integration of each battery unit 53 and the lower plate 82, and from the viewpoint of fixing the lower surface 53S2 of each battery unit 53 to the lower plate 82 in direct contact, it is desirable that the support portion 83 located below the lower plate 82 includes a vibration-damping member 83a. As the vibration-damping member 83a, a vibration-damping structure combining vibration-damping rubber, stays, housings, etc., can be used.

[0042] As in this embodiment, in a configuration in which multiple battery units 53 are sandwiched between an upper plate 81 and a lower plate 82 from above and below, the upper surface 53S1 and lower surface 53S2 of the battery unit 53 are supported by the upper plate 81 and the lower plate 82, thereby increasing the integration between the battery unit 53 and the upper plate 81 and the lower plate 82. As a result, even if vibration occurs when the hydraulic excavator 1 is in use, the battery unit 53 can be stably supported on the slewing frame 42 via the lower plate 82 and the support portion 83. In addition, the support portion 83 allows the fixing mechanism 80 to be installed while avoiding interference with (straddling) the structural strength member 42b (see Figures 3 to 5) of the slewing frame 42. The structural strength member 42b is a plate material for reinforcing the slewing frame 42, which is installed on the slewing frame 42 from front to back.

[0043] As shown in Figures 3 and 4, the fixing mechanism 80 has a connecting member 84. The connecting member 84 is a member that connects the upper plate 81 and the lower plate 82. From the viewpoint of firmly sandwiching the battery unit 53 from above and below between the upper plate 81 and the lower plate 82, and from the viewpoint of reducing the load on the contact portion (the bolted portion) between the battery unit 53 and the upper plate 81 when the upper plate 81, which is bolted to the battery unit 53, is lifted in order to move the battery unit 53 in a factory or the like, it is desirable to connect the upper plate 81 and the lower plate 82 with a connecting member 84 as in this embodiment.

[0044] In this embodiment, the fixing mechanism 80 has, as the connecting members 84 described above, a first connecting member 84-1 (see Figure 3), a second connecting member 84-2 (see Figure 3), and a third connecting member 84-3 (see Figure 4). However, the number of connecting members 84 is not limited to the three described above.

[0045] Figure 6 is a cross-sectional view of the first connecting member 84-1. Figure 7 is a cross-sectional view of the second connecting member 84-2. Figure 8 is a cross-sectional view of the third connecting member 84-3. Each connecting member 84 is composed of an upper plate fixing portion 84a, a lower plate fixing portion 84b, and a connecting portion 84c.

[0046] The upper plate fixing portion 84a is a flat plate located below the upper plate 81 and is fastened to the upper plate 81 by bolts. The lower plate fixing portion 84b is a flat plate located above the lower plate 82 and is fastened to the lower plate 82 by bolts. The connecting portion 84c is integrally formed with the upper plate fixing portion 84a and the lower plate fixing portion 84b and connects the upper plate fixing portion 84a and the lower plate fixing portion 84b in the vertical direction.

[0047] The connecting portion 84c is located with a gap between it and the battery unit 53 in the horizontal direction (left-right or front-back direction). Therefore, the connecting member 84 is located away from the battery unit 53.

[0048] From the standpoint of improving the heat dissipation efficiency of each battery unit 53, it is desirable that the connecting member 84 connects the upper plate 81 and the lower plate 82 at a position away from the battery unit 53, as shown in Figures 6 to 8.

[0049] Furthermore, from the viewpoint of connecting the upper plate 81 and lower plate 82 that sandwich the multiple battery units 53 from above and below in a balanced manner, and from the viewpoint of stably lifting the integrated unit (fixed unit) in which the multiple battery units 53 are sandwiched between the upper plate 81 and the lower plate 82, for example in a factory, it is desirable that the upper plate 81 and the lower plate 82 are connected by connecting members 84 at at least three locations around the multiple battery units 53. In order to realize this configuration, as shown in Figures 3 and 4, it is desirable that the first connecting member 84-1, the second connecting member 84-2, and the third connecting member 84-3 be positioned apart from each other along the outer circumference surrounding the multiple battery units 53 when viewed from above.

[0050] Furthermore, in order to connect the upper plate 81 and the lower plate 82 in a balanced manner with the three connecting members 84, and to prevent the multiple battery units 53 from tipping over in the front-to-back direction, it is desirable that the first connecting member 84-1, the second connecting member 84-2, and the third connecting member 84-3 be positioned on the lower plate 82 as follows.

[0051] In other words, as shown in Figures 3 and 4, the first connecting member 84-1 is positioned in front of the first battery unit 53A, which is the furthest forward of the multiple battery units 53; the second connecting member 84-2 is positioned behind the first connecting member 84-1 and facing each side of two or more adjacent battery units 53; and the third connecting member 84-3 is positioned behind the second connecting member 84-2 and preferably located via the first connecting member 84-1 and the multiple battery units 53 (for example, the first battery unit 53A to the third battery unit 53C).

[0052] In this embodiment, as shown in Figure 5, the first battery unit 53A, the second battery unit 53B, and the third battery unit 53C are positioned offset in one direction (left-right direction) on the lower plate 82. In this configuration, the second connecting member 84-2 (see Figure 3) is positioned adjacent to both the right side surface 53A-R of the first battery unit 53A, the right side surface 53B-R of the second battery unit 53B, and the front surface 53C-F of the third battery unit 53C on the lower plate 82. The right side surfaces 53A-R and 53B-R and the front surface 53C-F are positioned perpendicularly to each other on the lower plate 82.

[0053] Furthermore, in this embodiment, the third battery unit 53C and the fourth battery unit 53D are positioned offset from each other in the left-right direction on the lower plate 82. In this configuration, the third connecting member 84-3 (see Figure 4) is positioned adjacent to both the rear surface 53C-B of the third battery unit 53C and the left side surface 53D-L of the fourth battery unit 53D on the lower plate 82. The rear surface 53C-B and the left side surface 53D-L are positioned perpendicularly to each other on the lower plate 82.

[0054] In this embodiment, where two adjacent battery units 53 are positioned offset from each other in one direction (for example, left-right) on the lower plate 82, if the fixing mechanism 80 has multiple connecting members 84, from the viewpoint of effectively utilizing the empty space on the lower plate 82 (the remaining area excluding the area where the battery units 53 are placed), it is desirable that at least one of the multiple connecting members 84 be positioned on the lower plate 82 as follows. That is, it is desirable that at least one of the multiple connecting members 84 be positioned adjacent to two surfaces on the lower plate 82 that intersect perpendicularly to each other, when viewed from above, of the two battery units 53 that are positioned offset from each other in one direction.

[0055] As shown in Figures 3 and 4, the fixing mechanism 80 of this embodiment further includes a positioning member 85. The positioning member 85 is fixed on the lower plate 82. The positioning member 85 is also positioned on the lower plate 82 in contact with the bottom of any surface of the battery unit 53.

[0056] For example, the fixing mechanism 80 has positioning members 85, including a first positioning member 85-1, a second positioning member 85-2, a third positioning member 85-3, a fourth positioning member 85-4, a fifth positioning member 85-5, a sixth positioning member 85-6, a seventh positioning member 85-7, an eighth positioning member 85-8, and a ninth positioning member 85-9.

[0057] As shown in Figure 3, the first positioning member 85-1 is positioned on the lower plate 82 in contact with the bottom of the front surface 53A-F of the first battery unit 53A. The second positioning member 85-2 is positioned on the lower plate 82 in contact with the bottom of the right side surface 53C-R of the third battery unit 53C. The third positioning member 85-3 is positioned on the lower plate 82 in contact with the bottom of the right side surface 53D-R of the fourth battery unit 53D.

[0058] As shown in Figure 4, the fourth positioning member 85-4 and the fifth positioning member 85-5 are positioned on the lower plate 82 in contact with the bottom of the rear surface 53D-B of the fourth battery unit 53D. The sixth positioning member 85-6 is positioned on the lower plate 82 in contact with the bottom of the left side surface 53D-L of the fourth battery unit 53D. The seventh positioning member 85-7 is positioned on the lower plate 82 in contact with the bottom of the left side surface 53C-L of the third battery unit 53C. The eighth positioning member 85-8 is positioned on the lower plate 82 in contact with the bottom of the left side surface 53B-L of the second battery unit 53B. The ninth positioning member 85-9 is positioned on the lower plate 82 in contact with the bottom of the left side surface 53A-L of the first battery unit 53A.

[0059] In order to reduce the risk of the battery unit 53 being misaligned with respect to the lower plate 82 and to fix the battery unit 53 to an appropriate position on the lower plate 82 (by bolts, etc.), it is desirable that the fixing mechanism 80 has the positioning member 85 described above.

[0060] As shown in Figures 3 and 4, in this embodiment, the aforementioned junction box 65 is arranged on the upper plate 81. The junction box 65 is a type of electrical component. From the viewpoint of effectively utilizing the space above the upper plate 81, it is desirable that the electrical component be arranged on the upper plate 81, in other words, that the hydraulic excavator 1 be equipped with an electrical component arranged on the upper plate 81. Note that the electrical component arranged on the upper plate 81 is not limited to the junction box 65 described above, but may be other electrical components such as a PDU 64.

[0061] [4. Addendum] The hydraulic excavator 1 described in this embodiment can also be described as an electric work machine as shown in the following appendix.

[0062] The electric work machines mentioned in Appendix (1) are: Electric motor and The aircraft frame and A battery unit for storing power to drive the aforementioned electric motor, The battery unit is provided with a fixing mechanism for fixing it to the aircraft frame, The aforementioned fixing mechanism is The battery unit is sandwiched between upper and lower plates, It has a support portion that supports the lower plate on the aircraft frame.

[0063] The electric work machine in Appendix (2) is the same as the electric work machine described in Appendix (1), The support portion includes a vibration-damping member.

[0064] The electric work machine in Appendix (3) is the electric work machine described in Appendix (1) or (2), The upper surface of the battery unit is in contact with and fixed to the upper plate. The lower surface of the battery unit is in contact with and fixed to the lower plate.

[0065] The electric work machine in Appendix (4) is an electric work machine described in any of Appendix (1) to (3), The aforementioned fixing mechanism has a connecting member, The connecting member connects the upper plate and the lower plate.

[0066] The electric work machines in Appendix (5) are the electric work machines described in Appendix (4), The connecting member connects the upper plate and the lower plate at a position away from the battery unit.

[0067] The electric work machines in Appendix (6) are the electric work machines described in Appendix (4) or (5), The upper plate and the lower plate sandwich the multiple battery units from the upper and lower directions. Multiple battery units are positioned parallel to each other in one direction on the lower plate, and are also positioned in a direction perpendicular to that one direction. At least one of the plurality of battery units is positioned on the lower plate, offset from the other battery units in one direction, The fixing mechanism has a plurality of connecting members, At least one of the multiple connecting members is positioned on the lower plate adjacent to two surfaces that intersect perpendicularly with each other, when viewed from above, of two battery units that are offset in one direction.

[0068] The electric work machines in Appendix (7) are the electric work machines described in Appendix (6), The fixing mechanism includes a first connecting member, a second connecting member, and a third connecting member as the connecting members. The first connecting member, the second connecting member, and the third connecting member are positioned apart from each other along the outer circumference surrounding the plurality of battery units when viewed from above.

[0069] The electric work machines in Appendix (8) are the electric work machines described in Appendix (7), Multiple battery units are positioned on the lower plate parallel to the left-right direction, which is the one direction, and are also positioned in a front-to-back direction perpendicular to the one direction. The first connecting member is located in front of the battery unit that is located furthest forward among the plurality of battery units. The second connecting member is positioned behind the first connecting member and facing each side of two or more adjacent battery units. The third connecting member is located behind the second connecting member and is positioned between the first connecting member and the plurality of battery units.

[0070] The electric work machine in Appendix (9) is an electric work machine described in any of Appendix (1) to (8), The fixing mechanism further includes a positioning member fixed on the lower plate, The positioning member is positioned on the lower plate in contact with the bottom of any surface of the battery unit.

[0071] The electric work machine in Appendix (10) is an electric work machine described in any of Appendix (1) to (9), The upper plate is further equipped with electrical components arranged on it.

[0072] [5. Supplement] In this embodiment, the size (for example, the length in one direction) of each battery unit 53 is the same, but it is also possible to use some battery units 53 of different sizes.

[0073] In the above explanation, a hydraulic excavator 1, a type of construction machinery, was used as an example of an electric powered work machine. However, electric powered work machines are not limited to hydraulic excavators 1; other construction machinery such as wheel loaders may also be used. Furthermore, electric powered work machines may also be agricultural machinery such as combine harvesters or tractors.

[0074] Although embodiments of the present invention have been described above, the scope of the present invention is not limited thereto, and it can be expanded or modified without departing from the spirit of the invention. [Industrial applicability]

[0075] This invention can be used, for example, in work machinery such as construction machinery and agricultural machinery. [Explanation of symbols]

[0076] 1. Hydraulic excavator (electric work machine) 42. Rotating Frame (Aircraft Frame) 53 Battery Unit 53A First Battery Unit (Battery Unit) 53B Second Battery Unit (Battery Unit) 53C Third Battery Unit (Battery Unit) 53D Fourth Battery Unit (Battery Unit) 53S1 Top 53S2 Bottom side 61 Electric motor 65 Junction box (electrical components) 80 Fixing mechanism 81 Top plate 82 Lower plate 83 Support part 83a Vibration Isolator 84 Connecting member 84-1 First connecting member 84-2 Second connecting member 84-3 Third connecting member 85 Positioning member 85-1 First positioning member 85-2 Second positioning member 85-3 Third positioning member 85-4 Fourth positioning member 85-5 Fifth positioning member 85-6 Sixth positioning member 85-7 Seventh positioning member 85-8 Eighth positioning member 85-9 Positioning member #9

Claims

1. Electric motor and The aircraft frame and A battery unit for storing power to drive the aforementioned electric motor, The battery unit is provided with a fixing mechanism for fixing it to the aircraft frame, The aforementioned fixing mechanism is The battery unit is sandwiched between upper and lower plates, A support portion that supports the lower plate on the aircraft frame, It has, A structural member that protrudes vertically upward is formed on the upper surface of the aforementioned aircraft frame. The support portion is provided so as to straddle the structural member, in an electrically operated work machine.

2. The electric work machine according to claim 1, wherein the support portion includes a vibration-damping member.

3. The upper surface of the battery unit is in contact with and fixed to the upper plate. The electric work machine according to claim 1, wherein the lower surface of the battery unit is in contact with and fixed to the lower plate.

4. The aforementioned fixing mechanism has a connecting member, The electric work machine according to claim 1, wherein the connecting member connects the upper plate and the lower plate.

5. The electric work machine according to claim 4, wherein the connecting member connects the upper plate and the lower plate at a position away from the battery unit.

6. The upper plate and the lower plate sandwich the multiple battery units from the upper and lower directions. Multiple battery units are positioned parallel to each other in one direction on the lower plate, and are also positioned in a direction perpendicular to that one direction. At least one of the plurality of battery units is positioned on the lower plate, offset from the other battery units in one direction, The fixing mechanism has a plurality of connecting members, The electric work machine according to claim 4, wherein at least one of the plurality of connecting members is located on the lower plate adjacent to two surfaces that intersect perpendicularly with each other, when viewed from above, of two battery units that are offset in one direction.

7. The fixing mechanism includes a first connecting member, a second connecting member, and a third connecting member as the connecting members. The electric work machine according to claim 6, wherein the first connecting member, the second connecting member, and the third connecting member are positioned apart from each other along the outer circumference surrounding the plurality of battery units when viewed from above.

8. Multiple battery units are positioned on the lower plate parallel to the left-right direction, which is the one direction, and are also positioned in a front-to-back direction perpendicular to the one direction. The first connecting member is located in front of the battery unit that is located furthest forward among the plurality of battery units. The second connecting member is positioned behind the first connecting member and facing each side of two or more adjacent battery units. The electric work machine according to claim 7, wherein the third connecting member is located behind the second connecting member and is positioned via the first connecting member and a plurality of battery units.

9. The fixing mechanism further includes a positioning member fixed on the lower plate, The electric work machine according to claim 1, wherein the positioning member is positioned on the lower plate in contact with the bottom of any surface of the battery unit.

10. The electric work machine according to any one of claims 1 to 9, further comprising electrical components arranged on the upper plate.

Images