Electric construction machine

Abstract

To suppress unexpected contact between a maintenance operator and electric equipment.SOLUTION: An electric construction machine includes an electric motor and an electric component to which power is supplied from a battery, a hydraulic pump driven by the electric motor, a hydraulic component which makes hydraulic oil discharged from the hydraulic pump flow therein, a hydraulic equipment chamber which stores at least one of the hydraulic pump and the hydraulic component and has a first opening, an electric equipment chamber which stores at least one of the battery, the electric motor, and the electric component and has a second opening, a first opening / closing cover which opens the inside of the hydraulic equipment chamber through the first opening in an open state and covers the first opening in a closed state, and a second opening / closing cover which opens the inside in the electric equipment chamber through the second opening in an open state and covers the second opening in a closed state, wherein the first opening / closing cover is positioned in the outside of the hydraulic equipment chamber and between the first opening and the second opening, in the open state.SELECTED DRAWING: Figure 10

Description

Technical Field

[0001] The present invention relates to an electric construction machine such as a hydraulic excavator that uses electric power as a driving source.

Background Art

[0002] In electric construction machines, various electrical devices such as electric motors, inverters, and lithium-ion batteries are installed, in addition to hydraulic devices such as hydraulic pumps and valves. Some characteristics differ between hydraulic devices and electrical devices. In an electric construction machine having a hydraulic device and an electrical device, focusing on the difference in the operating temperature range between the hydraulic device and the electrical device, a structure that separates the electrical device chamber where the electrical device is arranged and the hydraulic device chamber where the hydraulic device is arranged to improve the cooling efficiency is known (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The electrical equipment mounted on an electric construction machine includes high-voltage components of several hundred volts supplied from a lithium-ion battery. Maintenance of such electrical equipment may require specialized knowledge and qualifications. The specialized knowledge and qualifications required for the maintenance of electrical equipment are different from those required for the maintenance of hydraulic equipment. Therefore, maintenance workers specializing in hydraulic equipment may lack knowledge regarding the maintenance of electrical equipment and may not fully understand the proper handling of electrical equipment. By separating and arranging the hydraulic equipment and the electrical equipment as in Patent Document 1, for example, the possibility that a maintenance worker for hydraulic equipment accidentally contacts the electrical equipment during the maintenance of the hydraulic equipment can be reduced. However, it is also conceivable that the maintenance of the hydraulic equipment is carried out with the nearby electrical equipment room open, and there is room for further improvement to prevent an unexpected contact between the worker maintaining the hydraulic equipment and the electrical equipment.

[0005] An object of the present invention is to provide an electric construction machine capable of suppressing an unexpected contact between a maintenance worker and electrical equipment.

Means for Solving the Problems

[0006] To achieve the above object, the present invention provides an electric construction machine comprising a battery, an electric motor and electrical components supplied with power from the battery, a hydraulic pump driven by the electric motor, hydraulic components through which the hydraulic oil discharged from the hydraulic pump flows, a hydraulic equipment room that houses at least one of the hydraulic pump and the hydraulic components and has a first opening, an electrical equipment room that houses at least one of the battery, the electric motor, and the electrical components and has a second opening, a first opening / closing cover that opens the inside of the hydraulic equipment room to the outside of the vehicle body through the first opening in an open state and covers the first opening in a closed state, and a second opening / closing cover that opens the inside of the electrical equipment room to the outside of the vehicle body through the second opening in an open state and covers the second opening in a closed state, wherein the first opening / closing cover is located outside the hydraulic equipment room and between the first opening and the second opening when the first opening / closing cover is in the open state.

Effects of the Invention

[0007] According to the present invention, it is possible to suppress unexpected contact between a maintenance worker and an electric device.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

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

[0010] -Electric Construction Machine- FIG. 1 is a side view showing the appearance of a hydraulic excavator, which is an example of an electric construction machine according to an embodiment of the present invention. The left side in FIG. 1 is defined as the front of the hydraulic excavator 1 (strictly speaking, the revolving body 1d).

[0011] The hydraulic excavator 1 uses electric power as a power source and includes a vehicle body 1B and a multi-articulated front working machine 1A attached to the vehicle body 1B. The front working machine 1A has a boom 1a, an arm 1b, and a bucket 1c that rotate in a vertical plane respectively. The vehicle body 1B includes a crawler-type traveling body 1e having crawlers 1g and a revolving body 1d rotatably mounted on the traveling body 1e. The traveling body 1e may be a wheel type. The revolving body 1d is provided with a cab 1f. The base end of the boom 1a of the front working machine 1A is connected to the front part of the revolving body 1d, the arm 1b is connected to the tip of the boom 1a, and the bucket 1c is connected to the tip of the arm 1b. The boom 1a, the arm 1b, the bucket 1c, the revolving body 1d, and the traveling body 1e are respectively driven by corresponding hydraulic actuators, specifically, a boom cylinder 2a, an arm cylinder 2b, a bucket cylinder 2c, a swing motor 2d (FIG. 6), and left and right traveling motors 2e.

[0012] Although not shown in FIG. 1, the revolving body 1d is equipped with an electric motor 17 (FIG. 3) as a prime mover, a hydraulic pump 8 (FIG. 3) driven by the electric motor 17, hydraulic components through which hydraulic oil flows (described later), a battery 25 (FIG. 7) that outputs electric power for driving the electric motor 17, electrical components (described later) supplied with electric power from the battery 25, etc. Hydraulic actuators such as the boom cylinder 2a, the arm cylinder 2b, the bucket cylinder 2c, the swing motor 2d, and the traveling motors 2e that drive the front working machine 1A and the vehicle body 1B are driven by the hydraulic oil discharged from the hydraulic pump 8.

[0013] -Hydraulic Equipment- Figure 2 is a view of the hydraulic excavator shown in Figure 1 as seen from the right side. Figure 3 is a right side view of the slewing body shown through the cover of the hydraulic excavator in Figure 1. Figure 4 is a front view seen in the direction of arrow A in Figure 3. Figure 5 is a plan view of the slewing body of the hydraulic excavator in Figure 1. Figure 6 is a plan view of the slewing body shown through the center cover of the hydraulic excavator in Figure 1. Figure 7 is a right rear view of the slewing body shown through the rear cover of the hydraulic excavator in Figure 1. Figure 8 is a left rear view of the slewing body of the hydraulic excavator in Figure 1. Figure 9 is a left side view of the rear part of the slewing body shown through the cover of the hydraulic excavator in Figure 1. Figures 3, 6, 7, and 9 - 11 show the slewing body of the hydraulic excavator extracted and presented.

[0014] For the hydraulic components through which the hydraulic oil flows, in addition to the piping system through which the hydraulic oil passes, there are included a control valve 9 (Figure 3) that controls the flow of hydraulic oil from the hydraulic pump 8 to hydraulic actuators such as the boom cylinder 2a, and a hydraulic oil tank 14 (Figure 5) that stores the hydraulic oil. These hydraulic components such as the control valve 9, the hydraulic pump 8, and hydraulic actuators such as the slewing motor 2d are collectively referred to as "hydraulic equipment" in this embodiment. The arrangement of the hydraulic equipment will be described below.

[0015] First, as shown in Figures 3 and 4, hydraulic equipment such as the hydraulic pump 8 and the control valve 9 are arranged in the right side portion of the slewing body 1d.

[0016] The control valve 9 is housed in a valve chamber 9R (Figure 3) located in the right front part of the slewing body 1d. The valve chamber 9R is provided adjacent to the front of an inverter chamber 18R and a pump chamber 8R, which will be described later. The valve chamber 9R is opened and closed by an opening / closing cover 9C dedicated to the valve chamber (Figure 2). The opening / closing cover 9C constitutes the right side surface of the outer shell of the slewing body 1d and covers the control valve 9. By opening the opening / closing cover 9C, access to the control valve 9 can be obtained, and the control valve 9 can also be visually inspected.

[0017] Note that "access" includes, for example, when a maintenance worker directly touches the target part or the like during maintenance work such as part replacement, as well as when touching the part with a tool or the like during part attachment / detachment work, and visual inspection for checking whether there is any abnormality in the part.

[0018] The hydraulic pump 8 is housed in a pump chamber 8R (Fig. 3) provided adjacent to the rear of the valve chamber 9R on the right side portion of the swivel body 1d. The pump chamber 8R is opened and closed by an opening / closing cover 8C dedicated to the pump chamber (Fig. 2). The opening / closing cover 8C constitutes the right side surface of the outer contour of the swivel body 1d. As shown in Fig. 4, the pump chamber 8R is partitioned from the motor chamber 17R (Fig. 3) adjacent to the rear by a hydraulic pump flange mounting surface 13. Also, as shown in Fig. 3, the pump chamber 8R is partitioned from the inverter chamber 18R adjacent above by a partition member 12. The hydraulic pump 8 is covered by an opening / closing cover 8C dedicated to the pump chamber, a partition member 12, and a hydraulic pump flange mounting surface 13 (Fig. 4). By opening the opening / closing cover 8C, access to the hydraulic pump 8 can be achieved, and the hydraulic pump 8 can be visually inspected.

[0019] Also, as shown in Fig. 6, a swing motor 2d is mounted as a hydraulic device at the center of the swivel body 1d. The swing motor 2d is covered by a center cover 16 (Fig. 5). Also, near the swing motor 2d, an operating oil tank 14 (Fig. 5) is installed as a hydraulic device. The operating oil tank 14 is adjacent to the right side of the hydraulic pump 8 and is located between the swing motor 2d and the hydraulic pump 8. By removing the center cover 16, access to the swing motor 2d can be achieved, and the swing motor 2d can be visually inspected.

[0020] -Electrical Equipment- The battery 25 mounted on the hydraulic excavator 1 is not a 12V / 24V lead battery or the like, but a high-voltage (for example, several hundred volts) lithium-ion battery. Electrical components supplied with high-voltage power from this battery 25 include, in addition to the power transmission system, an electrical branch box 19 (FIG. 6) containing a bus bar and a fuse, an inverter 18 (FIG. 3) that supplies the high-voltage power of the battery 25 to the electric motor 17, an in-vehicle charger 20 (FIG. 6) that charges the battery 25, an AC relay box 21 (FIG. 6), a DC relay box 27 (FIG. 9), and the like. In this embodiment, these electrical components such as the inverter 18, the battery 25, and the electric motor 17 are collectively referred to as "electrical equipment". The electrical equipment in this embodiment is high-voltage components supplied with the high-voltage power of the battery 25, including the battery 25. The arrangement of the electrical equipment will be described below.

[0021] First, as shown in FIGS. 3, 6, 7, and 9, on the right, rear, and left portions of the slewing body 1d, electrical equipment such as an electric motor 17 (FIG. 3), an inverter 18 (FIG. 3), an electrical branch box 19 (FIG. 6), an in-vehicle charger 20 (FIG. 6), an AC relay box 21 (FIG. 6), a battery 25 (FIG. 7), and a DC relay box 27 (FIG. 9) are installed.

[0022] The inverter 18 is housed in an inverter chamber 18R (FIG. 3) on the right side portion of the slewing body 1d. The inverter chamber 18R is adjacent above the pump chamber 8R and adjacent behind the valve chamber 9R. The inverter chamber 18R is opened and closed by an opening / closing cover 18C (FIG. 2) dedicated to the inverter chamber. The opening / closing cover 18C constitutes the right side surface of the outer shell of the slewing body 1d and covers the inverter 18. By opening the opening / closing cover 18C, access to the inverter 18 can be obtained, and the inverter 18 can be visually inspected.

[0023] The electric motor 17 is housed in a motor chamber 17R (Fig. 3) provided adjacent to the rear of the inverter chamber 18R and the pump chamber 8R on the right side of the swivel body 1d. The motor chamber 17R is opened and closed by an opening / closing cover 17C dedicated to the motor chamber (Fig. 2). The opening / closing cover 17C forms the right side surface of the outer contour of the swivel body 1d and covers the electric motor 17. By opening the opening / closing cover 17C, access to the electric motor 17 can be obtained, and the electric motor 17 can also be visually inspected.

[0024] The electrical branch box 19, the in-vehicle charger 20, and the AC relay box 21 are housed inside an upper right box 24 (Fig. 5) arranged adjacent to the upper part of the inverter chamber 18R and the motor chamber 17R on the right side of the swivel body 1d, as shown in Fig. 6. The upper right box 24 is opened and closed by an opening / closing cover 24C dedicated to the box provided on its upper surface (Fig. 5). The opening / closing cover 24C forms the upper right surface of the outer contour of the swivel body 1d and covers the electrical branch box 19, the in-vehicle charger 20, and the AC relay box 21. As shown in Fig. 6, the electrical branch box 19, the in-vehicle charger 20, and the AC relay box 21 are arranged side by side in the front-rear direction. In this embodiment, they are arranged in the order of the in-vehicle charger 20, the electrical branch box 19, and the AC relay box 21 from the front. By opening the opening / closing cover 24C, access to the electrical branch box 19, the in-vehicle charger 20, and the AC relay box 21 can be obtained, and they can also be visually inspected.

[0025] The battery 25 is located at the rear end of the swivel body 1d and is arranged adjacent to the rear of the motor chamber 17R and the upper right box 24, as shown in Fig. 7. The battery 25 is covered by a detachable rear cover 28 (Fig. 2). At the rear end of the swivel body 1d, a battery temperature adjustment system 26 (Fig. 7) is mounted above the battery 25. The battery temperature adjustment system 26 is covered by an upper cover 29 (Fig. 2). The rear cover 28 and the upper cover 29 form the rear end surface of the outer contour of the swivel body 1d. By removing the rear cover 28 or the upper cover 29, access to the battery 25 and the battery temperature adjustment system 26 can be obtained, and they can also be visually inspected.

[0026] As shown in FIG. 9, the DC relay box 27 is disposed at the left rear part of the rotating body 1d together with low-voltage components (not shown). The DC relay box 27 is covered with an opening / closing cover 27C (FIG. 1) on the left side of the rotating body 1d. The opening / closing cover 27C constitutes the left side surface of the outer contour of the rotating body 1d. Further, in the present embodiment, the connector 25a (FIG. 9) of the battery 25 is disposed on the left side of the rotating body 1d, and the connector 25a is covered with the opening / closing cover 27C together with the DC relay box 27 and the low-voltage components. By opening the opening / closing cover 27C, access can be made to the connector 25a of the battery 25 and the DC relay box 27, and these can be visually inspected.

[0027] -Cover- As described above, in the hydraulic excavator 1, there is provided a hydraulic equipment chamber (for example, the pump chamber 8R that houses the hydraulic pump 8 and the valve chamber 9R that houses the control valve 9) that houses at least one hydraulic equipment and has a first opening (for example, openings 8O, 9O), and an electric equipment chamber (for example, the inverter chamber 18R that houses the inverter 18 and the motor chamber 17R that houses the electric motor 17) that houses at least one electric equipment and has a second opening (for example, openings 18O, 17O). The hydraulic equipment (for example, the hydraulic pump 8 and the control valve 9) and the electric equipment (for example, the electric motor 17 and the inverter 18) are respectively housed separately in the hydraulic equipment chamber and the electric equipment chamber. The hydraulic equipment chamber is opened and closed by a first opening / closing cover (for example, opening / closing covers 8C, 9C), and the electric equipment chamber is opened and closed by a second opening / closing cover (for example, opening / closing covers 17C, 18C). Each first opening / closing cover is opened to the outside of the vehicle body 1B through the corresponding first opening in the corresponding hydraulic equipment chamber in the open state, and covers the first opening in the closed state to close the corresponding hydraulic equipment chamber. Each second opening / closing cover is opened to the outside of the vehicle body 1B through the corresponding second opening in the corresponding electric equipment chamber in the open state, and covers the second opening in the closed state to close the corresponding electric equipment chamber.

[0028] Note that both the first opening / closing cover and the second opening / closing cover are not limited to a structure that completely covers the entire first opening of the hydraulic equipment room or the second opening of the electrical equipment room in a closed state (for example, a plate material without holes such as a window), but may also have a structure in which the first opening or the second opening is partially exposed to the outside of the vehicle body 1B through holes such as ventilation windows even in the closed state. A net-like member may be installed in the holes provided in the first opening / closing cover and the second opening / closing cover.

[0029] Note that when the angle of the opening / closing cover in the "closed state" that closes the first opening of the hydraulic equipment room or the second opening of the electrical equipment room is A0, and the structural rotation limit angle in the opening direction is A1, the "open state" means a state where the angle of the opening / closing cover is larger than A0 and smaller than A1. For example, it means a state where the opening / closing cover is opened about 90°.

[0030] The opening / closing covers 8C, 9C, 17C, 18C, 24C, 27C that cover the hydraulic equipment and the electrical equipment are configured to rotate and open / close via hinges. Among these, particularly for the opening / closing covers 8C, 9C, 17C, 18C, when they are in the open state, they are configured to be located outside the hydraulic equipment room and the electrical equipment room and between the first opening of the adjacent hydraulic equipment room and the second opening of the electrical equipment room.

[0031] FIG. 10 is a plan view showing the opening directions of the opening / closing covers that open horizontally and are arranged on the side surface of the swivel body 1d, and FIG. 11 is a perspective view showing the opening directions of the opening / closing covers that open vertically and are arranged on the upper surface of the swivel body 1d.

[0032] The opening / closing cover 8C for opening and closing the pump chamber 8R has a hinge 8H (Fig. 10) on the left side (i.e., the trailing edge) as viewed from the right side of the swivel body 1d. The front part rotates via the hinge 8H, and as shown in Fig. 10, the front part rotates rearward, i.e., in the clockwise direction a in plan view, to open. The opening / closing cover 8C of the pump chamber 8R, which is a hydraulic equipment chamber, is positioned to cover at least a part of the opening 17O of the motor chamber 17R, which is an adjacent electrical equipment chamber, in a state where it is opened by an angle A1 (180 degrees in this example), i.e., in an inverted state, beyond the open state, from the outside of the vehicle body 1B. When in the open state, this opening / closing cover 8C is located outside the pump chamber 8R, which is a hydraulic equipment chamber, between the opening 18O as the first opening of this pump chamber 8R and the opening 17O as the second opening of the motor chamber 17R, which is an electrical equipment chamber adjacent to the rear of it. The opening / closing cover 8C is interposed between a maintenance worker who accesses in the access direction 32 from the side opposite to the hinge 8H of the opening / closing cover 8C to the pump chamber 8R by opening the opening / closing cover 8C and the opening 17O of the motor chamber 17R. The opening / closing cover 8C in the open state becomes an access barrier to the motor chamber 17R for a maintenance worker accessing the pump chamber 8R.

[0033] The opening / closing cover 9C that opens and closes the valve chamber 9R has a hinge 9H (Fig. 10) whose rotation axis extends vertically on the left side (i.e., the trailing edge) when viewed from the right side of the rotating body 1d, similar to the opening / closing cover 8C of the pump chamber 8R. The front part rotates via the hinge 9H, and as shown in Fig. 10, the front part rotates rearward, i.e., in the clockwise direction d in plan view, to open. The opening / closing cover 9C of the valve chamber 9R, which is a hydraulic equipment chamber, is also positioned so as to cover at least a part of the opening 18O of the inverter chamber 18R, which is an adjacent electrical equipment chamber, from the outside of the vehicle body 1B in a state where it is opened by an angle A1 (180 degrees in this example) beyond the open state (inverted state). When this opening / closing cover 9C is in the open state, it is located outside the valve chamber 9R, which is a hydraulic equipment chamber, between the opening 9O as the first opening of this valve chamber 9R and the openings 8O and 18O as the first and second openings of the adjacent pump chamber 8R and inverter chamber 18R, which is an electrical equipment chamber, behind it. The opening / closing cover 9C is interposed between the maintenance worker who accesses in the access direction 31 from the side opposite to the hinge 9H of the opening / closing cover 9C to the valve chamber 9R by opening this opening / closing cover 9C and the opening 18O of the inverter chamber 18R. The opening / closing cover 9C in the open state becomes an obstacle to access to the inverter chamber 18R for the maintenance worker accessing the valve chamber 9R.

[0034] Particularly, in this embodiment, the rotation axis (extending vertically) of the opening / closing cover 9C of the valve chamber 9R is non-parallel (perpendicular in this embodiment) to the rotation axis (extending front-rear) of the opening / closing cover 18C of the inverter chamber 18R adjacent in the opening direction (rearward). The opening / closing cover 9C of the valve chamber 9R covers the opening / closing cover 18C of the inverter chamber 18R in a state where it is opened by an angle A1 (180 degrees in this example) beyond the open state, and can regulate the opening of the opening / closing cover 18C of the inverter chamber 18R. Also, the rotation axis (extending vertically) of the opening / closing cover 9C of the valve chamber 9R is parallel to the rotation axis (extending vertically) of the opening / closing cover 8C of the pump chamber 8R adjacent in the opening direction (rearward). However, since the opening / closing cover 9C of the valve chamber 9R covers the opening / closing cover 8C from the front (the side for opening and closing) of the opening / closing cover 8C, when it is opened by an angle A1 (180 degrees in this example) beyond the open state, it can also regulate the opening of the opening / closing cover 8C of the pump chamber 8R.

[0035] In addition, the opening / closing cover 17C for opening and closing the motor chamber 17R has a hinge 17H (Fig. 10) whose rotation axis extends vertically on the right side (i.e., the front edge) when viewed from the right side of the rotating body 1d. The rear part rotates via the hinge 17H, and as shown in Fig. 10, the rear part rotates forward, i.e., counterclockwise in the plan view, to open. The opening / closing cover 17C of the motor chamber 17R, which is an electrical equipment chamber, is positioned to cover at least a part of the opening 8O of the pump chamber 8R, which is an adjacent hydraulic equipment chamber, in a state where it is opened by an angle A1 (180 degrees in this example) beyond the open state (inverted state) from the outside of the vehicle body 1B. When the opening / closing cover 17C is in the open state, it is located outside the motor chamber 17R, which is an electrical equipment chamber, between the opening 17O as the second opening of the motor chamber 17R and the opening 8O as the first opening of the pump chamber 8R, which is a hydraulic equipment chamber adjacent to the front of the motor chamber 17R. The opening / closing cover 17C is interposed between a maintenance worker who accesses in the access direction 33 from the side opposite to the hinge 17H of the opening / closing cover 17C to the motor chamber 17R by opening the opening / closing cover 17C and the opening 8O of the pump chamber 8R. The opening / closing cover 17C in the open state becomes an obstacle to access to the pump chamber 8R for a maintenance worker accessing the motor chamber 17R.

[0036] In the present embodiment, the pump chamber 8R, which is a hydraulic equipment chamber, and the motor chamber 17R, which is an electrical equipment chamber, are arranged adjacent to each other in the horizontal direction, and the respective opening / closing covers 8C, 17C are opened in opposite directions (directions a, b) to each other. When both are in the open state as shown in Fig. 10, their outer surfaces face each other. Therefore, when any of the opening / closing covers 8C, 17C of the pump chamber 8R and the motor chamber 17R is opened, it is located in the pump chamber 8R and the motor chamber 17R. For a maintenance worker accessing the pump chamber 8R, the opening / closing cover 8C becomes an obstacle to access to the motor chamber 17R, and for a maintenance worker accessing the motor chamber 17R, the opening / closing cover 17C becomes an obstacle to access to the pump chamber 8R.

[0037] In particular, in the present embodiment, the rotation axis (extending vertically) of the opening / closing cover 17C of the motor chamber 17R is non-parallel (perpendicular in the present embodiment) to the rotation axis (extending front-rear) of the opening / closing cover 18C of the inverter chamber 18R adjacent in the opening direction (front). The opening / closing cover 17C of the motor chamber 17R covers the opening / closing cover 18C of the inverter chamber 18R in a state where the opening / closing cover 17C is opened by an angle A1 (180 degrees in this example) beyond the open state, and can restrict the opening of the opening / closing cover 18C of the inverter chamber 18R.

[0038] Also, the opening / closing cover 18C for opening and closing the inverter chamber 18R has a hinge (not shown) whose rotation axis extends front-rear on the lower side (lower edge) when viewed from the right side of the swivel body 1d. The upper part rotates via the hinge, and as shown in FIG. 11, the upper part rotates downward, that is, in the clockwise direction c when viewed from the rear to open. The opening / closing cover 18C of the inverter chamber 18R, which is an electric equipment chamber, is positioned so as to cover at least a part of the opening 8O of the pump chamber 8R, which is an adjacent hydraulic equipment chamber, from the outside of the vehicle body in a state where the opening / closing cover 18C is opened by an angle A1 (180 degrees in this example) beyond the open state (inverted state). When in the open state, this opening / closing cover 18C is located between the opening 18O, which is the second opening of the inverter chamber 18R that is an electric equipment chamber, and the opening 8O, which is the first opening of the pump chamber 8R that is a hydraulic equipment chamber adjacent below it, and intervenes between the maintenance worker accessing the inverter chamber 18R by opening the opening / closing cover 18C and the opening 8O of the pump chamber 8R. The opening / closing cover 18C in the open state becomes an obstacle to accessing the pump chamber 8R for the maintenance worker accessing the inverter chamber 18R.

[0039] In particular, in the present embodiment, the rotation axis (extending front-rear) of the opening / closing cover 18C of the inverter chamber 18R is non-parallel (perpendicular in the present embodiment) to the rotation axis (extending vertically) of the opening / closing cover 8C of the pump chamber 8R adjacent in the opening direction (downward). The opening / closing cover 18C of the inverter chamber 18R opens in the direction of arrow c as shown in FIG. 11, and covers the opening / closing cover 8C of the pump chamber 8R in a state where it is opened by an angle A1 beyond the open state, and is configured to restrict the opening of the opening / closing cover 8C of the pump chamber 8R.

[0040] In addition, the opening / closing cover 27C has a hinge 27H (Fig. 10) whose rotation axis extends vertically along the left side (i.e., the front edge) when viewed from the left side of the swivel body 1d. The rear part rotates through the hinge 27H and opens by rotating forward, i.e., in the clockwise direction e in plan view, as shown in Fig. 11. The electrical equipment chamber housing the DC relay box 27 etc. is located on the left side of the swivel body 1d separately from other hydraulic equipment chambers and electrical equipment chambers. The access direction 34 for maintenance workers to access the connector 25a of the battery 25, the DC relay box 27, etc. is configured to be different from the access directions 31 - 33 etc. to other hydraulic equipment chambers and electrical equipment chambers. Since the electrical equipment chamber housing the DC relay box 27 etc. is physically separated from other hydraulic equipment chambers and electrical equipment chambers and also has a different access direction, maintenance workers accessing the DC relay box 27 etc. cannot access other hydraulic equipment chambers and electrical equipment chambers simultaneously.

[0041] Also, as shown in Fig. 10, a step 35 is provided adjacent to the rear of the central cover 16 on the swivel body 1d. When accessing the electrical branch box 19, the in - vehicle charger 20, and the AC relay box 21, the maintenance worker stands on the step 35 and opens the opening / closing cover 24C located on the upper surface of the swivel body 1d in the direction f as shown in Fig. 11 to widely open the upper - right box 24. When accessing the swivel motor 2d, the maintenance worker removes the central cover 16 while standing on the step 35. The hydraulic equipment chamber housing the swivel motor 2d is at a low position on the front side with respect to the step 35, while the upper - right box 24, which is an electrical equipment chamber, is at a high position on the right side. Thus, since the hydraulic equipment chamber housing the swivel motor 2d and the upper - right box 24 are physically separated and have different access directions, for example, a maintenance worker accessing the swivel motor 2d cannot access the upper - right box 24, which is also accessed using the step 35 as a foothold, simultaneously.

[0042] -Effect- (1) According to this embodiment, as described above, hydraulic devices such as the hydraulic pump 8 and the control valve 9 and electrical devices such as the electric motor 17 and the inverter 18 are separately housed in a hydraulic device chamber such as the pump chamber 8R and the valve chamber 9R and an electrical device chamber such as the motor chamber 17R and the inverter chamber 18R, respectively. And opening and closing covers 8C, 9C, 17C, 18C, etc. for opening and closing these hydraulic device chambers and electrical device chambers are configured to be positioned between the first opening of the hydraulic device chamber and the second opening of the electrical device chamber when they are in the open state, respectively. Thereby, when a maintenance worker accesses the pump chamber 8R, the valve chamber 9R, the motor chamber 17R, or the inverter chamber 18R, when the target opening and closing cover is opened, an open opening and closing cover is positioned between the maintenance worker and the opening of the electrical device chamber or the hydraulic device chamber adjacent thereto. Therefore, for example, when a maintenance worker accesses the pump chamber 8R, the motor chamber 17R adjacent to the pump chamber 8R is guarded by the open opening and closing cover 8C, and an unexpected contact between the maintenance worker and the electric motor 17 can be suppressed. Similarly, when maintaining the control valve 9, the opening and closing cover 9C serves as a guard and an unexpected contact between the maintenance worker and the inverter 18 is suppressed. Thus, according to this embodiment, an unexpected contact between the maintenance worker and the electrical device can be suppressed. Also, when a maintenance worker accesses the motor chamber 17R or the inverter chamber 18R, an unexpected contact between the maintenance worker and the hydraulic pump 8 is suppressed by the opening and closing covers 17C, 18C.

[0043] (2) Further, the pump chamber 8R and the motor chamber 17R are arranged adjacent to each other in the horizontal direction, and the respective opening / closing covers 8C, 17C are configured to face each other in the open state as shown in FIG. 10. Therefore, when any of the opening / closing covers 8C, 17C of the pump chamber 8R and the motor chamber 17R is opened, it is located in the pump chamber 8R and the motor chamber 17R. For the maintenance worker accessing the pump chamber 8R, the opening / closing cover 8C becomes an obstacle to accessing the motor chamber 17R, and for the maintenance worker accessing the motor chamber 17R, the opening / closing cover 17C also becomes an obstacle to accessing the pump chamber 8R. Adjacent opening / closing covers such as the opening / closing covers 8C, 17C are generally designed to open in the same direction uniformly, but in this embodiment, they are intentionally configured to open in different directions in order to function the opening / closing cover as an obstacle.

[0044] (3) The opening / closing covers 8C, 9C, 17C, 18C cover at least a part of the first opening of the adjacent hydraulic equipment chamber or the second opening of the electrical equipment chamber in the state of being opened beyond the open state. For example, the opening / closing cover 8C covers the opening 17O of the motor chamber 17R, the opening / closing cover 9C covers the opening 18O of the inverter chamber 18R, and the opening / closing covers 17C, 18C cover the opening 8O of the pump chamber 8R. By covering the openings of the adjacent hydraulic equipment chamber and the electrical equipment chamber with the opening / closing covers in the open state in this way, the opened opening / closing covers block the adjacent hydraulic equipment chamber and the electrical equipment chamber, and can more effectively suppress the unexpected contact between the stored equipment in the adjacent hydraulic equipment chamber and the electrical equipment chamber and the maintenance worker.

[0045] (4) The rotation axes of the opening / closing covers 9C, 18C of the valve chamber 9R and the inverter chamber 18R are made non-parallel, and when the opening / closing cover 9C of the valve chamber 9R is opened beyond the open state, it covers the opening / closing cover 18C of the inverter chamber 18R, and the opening of the opening / closing cover 18C of the inverter chamber 18R is restricted. Further, since the opening / closing cover 9C can also cover the opening / closing cover 8C of the pump chamber 8R, the opening of the opening / closing cover 8C of the pump chamber 8R can also be restricted.

[0046] Similarly, the rotating shafts of the opening / closing covers 17C and 18C of the motor chamber 17R and the inverter chamber 18R are made non-parallel, and when the opening / closing cover 17C of the motor chamber 17R is opened beyond the open state, it covers the opening / closing cover 18C of the inverter chamber 18R, restricting the opening of the opening / closing cover 18C of the inverter chamber 18R.

[0047] Furthermore, the rotating shafts of the opening / closing covers 18C and 8C of the inverter chamber 18R and the pump chamber 8R are made non-parallel, and when the opening / closing cover 18C of the inverter chamber 18R is opened beyond the open state, it covers the opening / closing cover 8C of the pump chamber 8R, restricting the opening of the opening / closing cover 8C of the pump chamber 8R.

[0048] In this way, when the opening / closing cover of the target hydraulic equipment chamber (or electrical equipment chamber) is opened beyond the open state, the opening of the opening / closing cover of the adjacent electrical equipment chamber (or hydraulic equipment chamber) is suppressed, and unexpected contact between the stored equipment in the adjacent hydraulic equipment chamber or electrical equipment chamber and the maintenance worker can be more effectively suppressed. Although the adjacent opening / closing covers tend to be designed to open uniformly in the horizontal direction, in this embodiment, by making the opening / closing cover 18C of the inverter chamber 18R have a downward-opening structure, the opening / closing covers in the adjacent positional relationship are intentionally configured to restrict each other's opening / closing.

[0049] (5) Since the pump chamber 8R is partitioned from the adjacent motor chamber 17R and inverter chamber 18R, which are electrical equipment chambers, by the partition member 12 and the hydraulic pump flange mounting surface 13, the pump chamber 8R, which is the main hydraulic equipment chamber, can be firmly separated from the adjacent electrical equipment chambers.

[0050] (6) Also, since the electric branch box 19 aggregates the electric wires for power transmission to other electrical equipment, it is assumed that the opportunity to access the electric branch box 19 increases during the maintenance of the electrical equipment. On the other hand, in the hydraulic equipment, the hydraulic pump 8 and the control valve 9 are the main equipment. Therefore, when accessing the electric branch box 19 housed in the upper right box 24, it is configured to access from the upper surface side of the swivel body 1d at step 35. When accessing the hydraulic pump 8 and the control valve 9, access is from the right side of the swivel body 1d. Thus, the access route to the electric branch box 19 is different from the access routes to the hydraulic pump 8 and the control valve 9. With such a configuration, it becomes impossible to access the electric branch box 19 simultaneously with the hydraulic pump 8 and the control valve 9, and the maintenance worker during the maintenance of the hydraulic equipment does not come into contact with the electric branch box 19.

[0051] (7) Also, step 35 is not limited to the case of accessing the upper right box 24 in which the electric branch box 19 etc. are housed, but is also used as a work platform for the maintenance worker when accessing the swivel motor 2d as described above. The maintenance worker stands on step 35, removes the center cover 16, and accesses the swivel motor 2d. That is, the narrow step 35 is shared for accessing the upper right box 24 which is the electrical equipment room and the swivel motor 2d which is the hydraulic equipment. However, for step 35, the hydraulic equipment room housing the swivel motor 2d is at a low position on the front side, while the upper right box 24 which is the electrical equipment room is at a high position on the right side. Thus, the hydraulic equipment room housing the swivel motor 2d and the upper right box 24 are physically separated and have different access directions. Therefore, for example, the maintenance worker accessing the swivel motor 2d cannot access the upper right box 24 which also uses step 35 as a work platform at the same time, and unexpected contact between the maintenance worker accessing the swivel motor 2d and the electric branch box 19 etc. can be suppressed.

[0052] (8) Also, the electrical equipment room that houses the DC relay box 27 and the like is located on the left side of the revolving body 1d separately from other hydraulic equipment rooms and electrical equipment rooms. The access direction 34 for maintenance workers to access the connector 25a of the battery 25, the DC relay box 27, etc. is configured to be different from the access directions 31 - 33, etc. to other hydraulic equipment rooms and electrical equipment rooms. Since the electrical equipment room that houses the DC relay box 27 and the like is physically separated from other hydraulic equipment rooms and electrical equipment rooms and has a different access direction, it is possible to suppress unexpected contact between the maintenance workers accessing the DC relay box 27 and the like and the equipment housed in other hydraulic equipment rooms and electrical equipment rooms.

[0053] -Modification Example- The present invention is not limited to the above-described embodiments and may include various modification examples. For example, the present invention is not necessarily limited to a configuration having all the configurations described in the above embodiments. For example, it is possible to replace a part of the configuration with another configuration. Also, it is possible to delete a part of the configuration of the embodiment or add another configuration. Also, although the hydraulic excavator 1 has been described as an example of the construction machine to which the invention is applied, the present invention is also applicable to other construction machines such as wheel loaders.

Description of Reference Numerals

[0054] 1…Hydraulic excavator (electric construction machine), 2a…Boom cylinder (hydraulic actuator), 2b…Arm cylinder (hydraulic actuator), 2c…Bucket cylinder (hydraulic actuator), 2d…Slewing motor (hydraulic actuator), 2e…Travel motor (hydraulic actuator), 8…Hydraulic pump, 8C…Opening / closing cover, 8O…Opening (first opening), 8R…Pump chamber (hydraulic equipment chamber), 9…Control valve (hydraulic component), 9C…Opening / closing cover, 9O…Opening (first opening), 9R…Valve chamber (hydraulic equipment chamber), 14…Hydraulic oil tank (hydraulic component), 17…Electric motor, 17C…Opening / closing cover, 17O…Opening (second opening), 17R…Motor chamber (electrical equipment chamber), 18…Inverter (electrical component), 18C…Opening / closing cover, 18O…Opening (second opening), 18R…Inverter chamber (electrical equipment chamber), 19…Electrical branch box (electrical component), 20…Vehicle-mounted charger (electrical component), 21…AC relay box (electrical component), 24…Upper right box (electrical equipment chamber), 24C…Opening / closing cover, 25…Battery, 27…DC relay box (electrical component), 27C…Opening / closing cover

Claims

1. A battery, an electric motor and electrical components supplied with power from the battery, a hydraulic pump driven by the electric motor, hydraulic components through which the hydraulic oil discharged from the hydraulic pump flows, a hydraulic equipment chamber that houses at least one of the hydraulic pump and the hydraulic components and has a first opening, an electrical equipment chamber that houses at least one of the battery, the electric motor, and the electrical components and has a second opening, a first opening / closing cover that opens the inside of the hydraulic equipment chamber to the outside of the vehicle body through the first opening in the open state and covers the first opening in the closed state, In an electric construction machine comprising a second opening / closing cover that opens the inside of the electrical equipment chamber to the outside of the vehicle body through the second opening in the open state and covers the second opening in the closed state, when the first opening / closing cover is in the open state, the first opening / closing cover is located outside the hydraulic equipment chamber and between the first opening and the second opening. An electric construction machine characterized by the above.

2. In the electric construction machine according to Claim 1, the hydraulic equipment chamber is arranged adjacent to the electrical equipment chamber, when both the first opening / closing cover and the second opening / closing cover are in the open state, their outer surfaces are configured to face each other. An electric construction machine characterized by the above.

3. In the electric construction machine according to Claim 1, the first opening / closing cover is positioned so as to cover at least a part of the second opening from the outside of the vehicle body when the first opening / closing cover is opened beyond the open state. An electric construction machine characterized by the above.

4. In the electric construction machine according to Claim 1, the hydraulic equipment chamber is arranged adjacent to the electrical equipment chamber, the first opening / closing cover is configured to cover the second opening / closing cover when the first opening / closing cover is opened beyond the open state. An electric construction machine characterized by the above.

5. In the electric construction machine according to Claim 1, the battery is a lithium-ion battery, the hydraulic equipment chamber includes a pump chamber that houses the hydraulic pump, the electrical equipment chamber includes a motor chamber that houses the electric motor, the first opening / closing cover includes an opening / closing cover for the pump chamber, the second opening / closing cover includes an opening / closing cover for the motor chamber, the motor chamber is provided adjacent to the rear of the pump chamber. When in the open state, the opening / closing cover of the pump chamber is located outside the pump chamber, between the opening of the pump chamber as the first opening and the opening of the motor chamber as the second opening. An electric construction machine characterized by the above.

6. In the electric construction machine according to claim 5, the hydraulic components include a control valve that controls the flow of hydraulic oil from the hydraulic pump to the hydraulic actuator, the electrical components include an inverter that supplies power from the lithium-ion battery to the electric motor, the hydraulic equipment chamber includes a valve chamber that houses the control valve, the electrical equipment chamber includes an inverter chamber that houses the inverter, the first opening / closing cover includes the opening / closing cover of the valve chamber, the second opening / closing cover includes the opening / closing cover of the inverter chamber, the valve chamber is provided adjacent to the front of the inverter chamber, When in the open state, the opening / closing cover of the valve chamber is located outside the valve chamber, between the opening of the valve chamber as the first opening and the opening of the inverter chamber as the second opening. An electric construction machine characterized by the above.

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