electric excavator

Abstract

To provide an electric shovel which can appropriately support a battery with a simple structure while suppressing a design change of a turning frame.SOLUTION: A turning frame 20 has a bottom plate BP, and a main beam MB rising upward from the bottom plate BP. The main beam MB extends in a longitudinal direction at a central part in a horizontal direction of the turning frame 20. A support for battery mounting is arranged in the main beam MB of the turning frame 20.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present disclosure relates to an electric shovel.

Background Art

[0002] In an electric hydraulic shovel, a configuration in which a shelf for storing a battery is arranged at the rear end portion of the machine body frame is disclosed in, for example, Japanese Patent Application Laid-Open No. 2021-80691 (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the configuration of Patent Document 1, in order to support the weight of the battery, it is necessary to improve the strength of the entire rear end portion of the machine body frame where the shelf is arranged. Therefore, in order to apply it to an electric shovel, a significant design change of the machine body frame is required.

[0005] An object of the present disclosure is to provide an electric shovel that can appropriately support a battery with a simple structure while suppressing design changes of the swing frame.

Means for Solving the Problems

[0006] The electric shovel of the present disclosure includes a swing frame and a support for mounting a battery. The swing frame has a bottom plate and a main beam that rises upward from the bottom plate. The main beam extends in the front-rear direction at the center in the left-right direction of the swing frame. The support for mounting a battery is arranged on the main beam of the swing frame.

Effects of the Invention

[0007] According to this disclosure, it is possible to realize an electric excavator that can properly support the battery with a simple structure while minimizing changes to the design of the slewing frame. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic perspective view showing the configuration of an electric excavator in one embodiment of the present disclosure. [Figure 2] Figure 1 is a perspective view showing the configuration of the battery structure and swing frame in an electric excavator. [Figure 3] Figure 2 is an exploded perspective view of the battery structure. [Figure 4] Figure 2 shows a rear view (A) of the battery structure attached to the slewing frame, and an enlarged cross-sectional view (B) of area RA in (A) cut vertically by the fastening member 50. [Figure 5] Figure 2 is a perspective view illustrating the attachment of the battery structure to the slewing frame. [Figure 6] Figure 2 is a side view showing the battery structure attached to the swing frame. [Figure 7] This is an exploded perspective view of a battery structure with a modified mounting frame. [Figure 8] Figure 7 is a perspective view showing the battery structure attached to the swivel frame. [Figure 9] This is a cross-sectional view in a side view showing a modified mounting position using fastening members. [Modes for carrying out the invention]

[0009] The embodiments of this disclosure will be described below with reference to the drawings. In the specification and drawings, the same reference numerals are used for identical or corresponding components, and redundant descriptions are avoided. Furthermore, in the drawings, components may be omitted or simplified for the sake of clarity. Also, at least some of the embodiments and modifications may be combined in any way.

[0010] In the following description, "up," "down," "forward," "backward," "left," and "right" refer to directions relative to the operator seated in the driver's seat 4S in the cab 4 shown in Figure 1. The electric excavator 100 may be an electric excavator having an electric motor as its drive source, or it may be a hybrid excavator having both an engine and an electric motor as its drive sources. The electric excavator 100 may be a type in which the driving force of the electric motor operates a hydraulic actuator, or a type in which the driving force of the electric motor operates an electric actuator.

[0011] <Configuration of an electric excavator> First, the configuration of the electric excavator in this embodiment will be explained using Figure 1.

[0012] Figure 1 is a schematic perspective view showing the configuration of an electric excavator in one embodiment of the present disclosure. As shown in Figure 1, the electric excavator 100 has a main body 1 and a hydraulically operated work implement 2. The main body 1 has a slewing body 3 and a traveling body 5.

[0013] The vehicle 5 has a pair of tracks 5Cr and a drive motor 5M. The electric excavator 100 can move by the rotation of the tracks 5Cr. The drive motor 5M is provided as the drive source for the vehicle 5. The drive motor 5M is a hydraulic motor that operates by hydraulic pressure. The vehicle 5 may also have wheels (tires).

[0014] The slewing body 3 is positioned on and supported by the traveling body 5. The slewing body 3 is capable of rotating around the pivot axis RX relative to the traveling body 5 by a slewing motor (not shown). The slewing motor is a hydraulic motor operated by hydraulics. The pivot axis RX is a hypothetical straight line that serves as the pivot center of the slewing body 3. Note that the traveling motor 5M or the slewing motor may be electric motors.

[0015] The slewing body 3 has a cab 4. Inside the cab 4, a driver's seat 4S for the operator to sit on is provided. The operator (crew member) can board the cab 4 and operate the working machine 2, slew the slewing body 3 with respect to the traveling body 5, and operate the traveling of the electric excavator 100 by the traveling body 5. The electric excavator 100 may be remotely operated.

[0016] The working machine 2 is supported by the slewing body 3. The working machine 2 has a boom 6, an arm 7, and a bucket 8. The working machine 2 further has a boom cylinder 10, an arm cylinder 11, and a bucket cylinder 12.

[0017] The boom 6 is rotatably connected to the main body 1. Specifically, the base end portion of the boom 6 is rotatably connected to the slewing body 3 with a boom foot pin 13 (Fig. 2) as a fulcrum. The arm 7 is rotatably connected to the boom 6. Specifically, the base end portion of the arm 7 is rotatably connected to the tip end portion of the boom 6 with a boom top pin 14 as a fulcrum. The bucket 8 is rotatably connected to the arm 7. Specifically, the base end portion of the bucket 8 is rotatably connected to the tip end portion of the arm 7 with an arm top pin 15 as a fulcrum.

[0018] One end of the boom cylinder 10 is connected to the slewing body 3, and the other end is connected to the boom 6. The boom 6 can be driven with respect to the main body 1 by the boom cylinder 10. By this drive, the boom 6 can rotate in the vertical direction with respect to the slewing body 3 with the boom foot pin 13 as a fulcrum.

[0019] One end of the arm cylinder 11 is connected to the boom 6, and the other end is connected to the arm 7. The arm 7 can be driven with respect to the boom 6 by the arm cylinder 11. By this drive, the arm 7 can rotate in the vertical direction or the front-rear direction with respect to the boom 6 with the boom top pin 14 as a fulcrum.

[0020] One end of the bucket cylinder 12 is connected to the arm 7, and the other end is connected to the bucket link 17. The bucket 8 is driveable relative to the arm 7 by the bucket cylinder 12. This drive allows the bucket 8 to rotate vertically relative to the arm 7, with the arm top pin 15 as the pivot point.

[0021] Each of the boom cylinder 10, arm cylinder 11, and bucket cylinder 12 is a hydraulic cylinder and is driven by hydraulic pressure.

[0022] The rotating body 3 has an outer cover 9. The outer cover 9 covers the machine room. The machine room contains a battery structure 30 (Figure 2), etc.

[0023] <Configuration of the swing frame and battery structure> Next, the configuration of the swing frame 20 and battery structure 30 in the electric excavator 100 shown in Figure 1 will be explained using Figures 2 to 4.

[0024] Figure 2 is a perspective view showing the configuration of the battery structure and the slewing frame in the electric excavator shown in Figure 1. Figure 3 is an exploded perspective view of the battery structure shown in Figure 2. Figure 4 is a rear view (A) showing the battery structure shown in Figure 2 attached to the slewing frame, and an enlarged cross-sectional view (B) of area RA in (A) cut vertically by the fastening member 50.

[0025] As shown in Figure 2, the rotating body 3 (Figure 1) has a rotating frame 20. The rotating frame 20 rotates relative to the traveling body 5 (Figure 1) about the rotation axis RX. The rotating frame 20 has a center frame CF, a left deck DL, and a right deck DR. The center frame CF is located approximately in the center of the rotating frame 20 in the left-right direction. The left deck DL is located to the left of the center frame CF. The right deck DR is located to the right of the center frame CF.

[0026] The slewing frame 20 has a base plate BP and a pair of main beams MB. One and the other of the pair of main beams MB are positioned opposite each other with a gap between them in the left-right direction. Each of the pair of main beams MB protrudes upward from the base plate BP.

[0027] Each of the pair of main beams MB extends in the front-rear direction at the center of the slewing frame 20 in the left-right direction. Here, the center refers to the region where the center frame CF of the slewing frame 20 is located. Each of the pair of main beams MB is located on the center frame CF. The pair of main beams MB are, for example, parallel to each other. Each of the pair of main beams extends to the rearmost end of the center frame CF.

[0028] A pair of main beams MB support the work implement 2 (Figure 1). Thus, the center frame CF supports the work implement 2. Each of the pair of main beams MB has through holes TH1 and TH2. A boom foot pin 13 is inserted through the through hole TH1. The boom foot pin 13 rotatably supports the boom 6 (Figure 1) on the pair of main beams MB.

[0029] A pin (not shown) supporting the boom cylinder 10 (Figure 1) is inserted through the through-hole TH2. This pin rotatably supports the boom cylinder 10 on the main beam MB.

[0030] The battery structure 30 is located at the rear end of the slewing frame 20. The battery structure 30 is located at the upper end of a pair of main beams MB.

[0031] As shown in Figure 3, the battery structure 30 includes a battery frame 31, a frame body 35, and a plurality of damper mounts (damping members) 40. The battery frame 31 includes at least one (e.g., three) battery assemblies AS and at least one (e.g., two) frames 34.

[0032] The battery assembly AS includes at least one (for example, two) battery packs 32 and at least one (for example, two) bracket bodies 33. The two battery packs 32 are stacked one above the other. The two stacked battery packs 32 are fixed to each other by, for example, two bracket bodies 33.

[0033] One of the two bracket bodies 33 is positioned in front of the two battery packs 32, and the other bracket body 33 is positioned behind the two battery packs 32. The bracket body 33 is fixed to each of the lower and upper battery packs 32, for example, by bolts.

[0034] The battery pack 32 has, for example, multiple battery modules. Each of the multiple battery modules has, for example, multiple battery cells (unit batteries). The multiple battery cells are connected alternately with positive and negative terminals within the battery module.

[0035] The bracket body 33 has at least one (for example, two) brackets 33a and a support plate 33b. The support plate 33b is made of, for example, a flat plate. One of the two brackets 33a is positioned at one longitudinal end of the support plate 33b, and the other of the two brackets 33a is positioned at the other longitudinal end of the support plate 33b. Each of the two brackets 33a is fixed to the support plate 33b, for example, by welding. Each of the two brackets 33a protrudes from the support plate 33b. Each of the two brackets 33a is the portion that is attached to the damper mount 40.

[0036] Multiple battery assemblies AS (for example, three) are stacked vertically. As a result, in the battery structure 30, for example, six battery packs 32 are stacked vertically. The stacked structure of three battery assemblies AS is fixed by two frames 34.

[0037] Each of the two frames 34 has, for example, a rectangular frame shape. Each of the two frames 34 is attached to, for example, the left-right end of the stacked structure of the multiple battery assemblies AS. That is, one of the two frames 34 is attached to one left-right end of the stacked structure of the multiple battery assemblies AS, and the other of the two frames 34 is attached to the other left-right end of the stacked structure of the multiple battery assemblies AS.

[0038] Each of the two frames 34 surrounds, for example, the periphery (front, back, top, and bottom) of a stacked structure of three battery assemblies AS. The frames 34 are fixed to both the bracket 33a and the support plate 33b by fastening members such as bolts.

[0039] In a state where multiple battery assemblies AS are fixed by two frames 34, multiple (for example, six) brackets 33a located in front of the battery pack 32 protrude forward from the support plate 33b. The multiple brackets 33a located in front of the battery pack 32 are arranged, for example, in two rows in the left-right direction, with three brackets arranged in the up-down direction in each row.

[0040] Furthermore, in a state where multiple battery assemblies AS are fixed by two frames 34, multiple (for example, six) brackets 33a located behind the battery pack 32 protrude rearward from the support plate 33b. The multiple brackets 33a located behind the battery pack 32 are arranged, for example, in two rows in the left-right direction, with three brackets arranged in the up-down direction in each row.

[0041] The battery frame 31 is supported by the frame body 35 via a plurality (for example, 12) of damper mounts 40. The frame body 35 has a pair of front and rear frame members 36a to 36c, a mounting frame 38, and a connecting frame 39.

[0042] One of the front and rear frame members 36a is positioned in front of the battery frame 31, and the other of the front and rear frame members 36a is positioned behind the battery frame 31. Each of the front and rear frame members 36a has a support column PRa and a frame plate FBa. The frame plate FBa has, for example, a flat plate shape. The support column PRa has a portion that protrudes upward from the upper surface of the frame plate FBa and a portion that protrudes downward from the lower surface of the frame plate FBa. The support column PRa is fixed to the frame plate FBa, for example, by welding. The support column PRa is provided at each of the longitudinal ends of the frame plate FBa. The support column PRa may have, for example, a column shape (cylindrical shape, rectangular prism shape, etc.) or a hollow cylindrical shape (cylindrical shape, rectangular tube shape, etc.).

[0043] One of the front and rear frame members 36b is positioned in front of the battery frame 31, and the other of the front and rear frame members 36b is positioned behind the battery frame 31. Each of the front and rear frame members 36b has a support column PRb and a frame plate FBb. The frame plate FBb has, for example, a flat plate shape. The support column PRb protrudes upward from the upper surface of the frame plate FBb. The support column PRb is fixed to the frame plate FBb, for example, by welding. The support column PRb is provided at each of the longitudinal ends of the frame plate FBb. The support column PRb may have, for example, a column shape (cylindrical shape, rectangular prism shape, etc.) or a hollow cylindrical shape (cylindrical shape, rectangular tube shape, etc.).

[0044] One of the front and rear frame members 36c is positioned in front of the battery frame 31, and the other of the front and rear frame members 36c is positioned behind the battery frame 31. Each of the front and rear frame members 36c has a support column PRc and a frame plate FBc. The frame plate FBc has, for example, a flat plate shape. The support column PRc protrudes upward from the upper surface of the frame plate FBc. The support column PRc is fixed to the frame plate FBc, for example, by welding. The support column PRc is provided at each of the longitudinal ends of the frame plate FBc. The support column PRc may have, for example, a column shape (cylindrical shape, rectangular prism shape, etc.) or a hollow cylindrical shape (cylindrical shape, rectangular tube shape, etc.).

[0045] Frame member 36b is placed on top of frame member 36a. Frame member 36c is placed on top of frame member 36b.

[0046] Frame member 36a is fixed to frame member 36b by fastening members such as bolts. Specifically, the upper end of the support column PRa on frame member 36a is fixed to the frame plate FBb of frame member 36b by fastening members such as bolts. When frame member 36a and frame member 36b are fixed to each other, the support column PRb on frame member 36b is located directly above the support column PRa on frame member 36a. In this state, the support columns PRa and PRb are arranged coaxially with each other, for example.

[0047] Frame member 36b is fixed to frame member 36c by fastening members such as bolts. Specifically, the upper end of the support column PRb on frame member 36b is fixed to the frame plate FBc of frame member 36c by fastening members such as bolts. In the state where frame member 36b and frame member 36c are fixed to each other, the support column PRc on frame member 36c is located directly above the support column PRb on frame member 36b. In this state, the support column PRb and the support column PRc are, for example, arranged coaxially with each other.

[0048] One support column 37 (Figure 2) is composed of coaxially arranged support columns PRa, PRb, and PRc. The frame body 35 has at least one (for example, four) support columns 37. At least one support column 37 has a plurality (for example, two) of support columns 37 (first support columns) positioned in front of the battery frame 31 as shown in Figure 2, and a plurality (for example, two) of support columns 37 (second support columns) positioned behind the battery frame 31 as shown in Figure 4(A).

[0049] As shown in Figure 2, each of the multiple (for example, two) support columns 37 (first support columns) located in front of the battery frame 31 is fitted with frame plates FBa, FBb, and FBc, which are located in front of the battery frame 31.

[0050] As shown in Figure 4(A), each of the multiple (for example, two) support columns 37 (second support columns) located at the rear of the battery frame 31 is fitted with frame plates FBa, FBb, and FBc, which are located at the rear of the battery frame 31.

[0051] As shown in Figures 2 and 4(A), each of the multiple support columns 37 has the role of supporting the load of the battery frame 31, preventing interference between the battery frame 31 and other components, and preventing the weight of the electric excavator 100 from acting on the battery frame 31 even if the electric excavator 100 tips over.

[0052] As shown in Figure 3, the assemblies of frame members 36a, 36b, and 36c are positioned at the front and rear of the battery frame 31, respectively. The assemblies of frame members 36a, 36b, and 36c positioned at the front of the battery frame 31 and the assemblies of frame members 36a, 36b, and 36c positioned at the rear of the battery frame 31 are connected to each other by a mounting frame 38 and a connecting frame 39.

[0053] The mounting frame 38 is positioned below the battery frame 31. The mounting frame 38 is attached to both the frame member 36a positioned in front of the battery frame 31 and the frame member 36a positioned behind the battery frame 31 by fastening members such as bolts. Specifically, the mounting frame 38 is attached to both the frame plate FBa (first frame plate) of the frame member 36a positioned in front of the battery frame 31 and the frame plate FBa (second frame plate) of the frame member 36a positioned behind the battery frame 31.

[0054] The connecting frame 39 is positioned above the battery frame 31. The connecting frame 39 is fixed to both the frame member 36c positioned in front of the battery frame 31 and the frame member 36c positioned behind the battery frame 31 by fastening members such as bolts. Specifically, the connecting frame 39 is fixed to the support column PRc of the frame member 36c positioned in front of the battery frame 31 and to the support column PRc of the frame member 36c positioned behind the battery frame 31.

[0055] The battery frame 31 is supported by the frame body 35 via multiple (for example, 12) damper mounts 40. The damper mounts 40 suppress the transmission of vibrations, shocks, etc., from the frame body 35 to the battery frame 31 by attenuating them.

[0056] The damper mount 40 may be made of an elastic material (e.g., rubber), an elastic member (e.g., a coil spring), or it may be filled with a viscous fluid (e.g., silicone oil). Alternatively, the damper mount 40 may be composed of any combination of an elastic material, an elastic member, and a configuration filled with a viscous fluid.

[0057] The multiple damper mounts 40 include damper mounts 40 located in front of the battery frame 31 and damper mounts 40 located behind the battery frame 31. The damper mounts 40 located in front of the battery frame 31 are positioned between each of the frame plates FBa, FBb, and FBc located in front of the battery pack 32 and the bracket 33a. The damper mounts 40 located behind the battery frame 31 are positioned between each of the frame plates FBa, FBb, and FBc located behind the battery pack 32 and the bracket 33a.

[0058] The damper mount 40 is inserted into through holes in each of the frame plates FBa, FBb, and FBc, and is supported by each of the frame plates FBa, FBb, and FBc by fastening members such as bolts. The portion of the damper mount 40 that protrudes upward from each of the frame plates FBa, FBb, and FBc is fixed to the lower surface of the bracket 33a. The damper mount 40 is fixed to the bracket 33a by fastening members such as bolts.

[0059] Although the above describes a configuration in which the battery structure 30 is placed on the main beam MB, a battery mounting support, from which the battery pack 32 has been removed from the battery structure 30, may also be placed on the main beam MB. The battery mounting support has a configuration in which all battery packs 32 have been removed from the battery structure 30.

[0060] Furthermore, the battery mounting support is configured to support a battery, and may be configured to support a battery module or battery cells instead of a battery pack 32. The battery mounting support may also be configured to support a battery pack 32, a battery module, and battery cells in any combination. This allows the battery (battery pack 32, battery module, battery cells, etc.) to be retrofitted to the battery mounting support after the battery mounting support has been pre-attached to the main beam MB.

[0061] <Mounting of battery structure to slewing frame> Next, the attachment of the battery structure 30 shown in Figures 2 and 3 to the swing frame will be explained using Figures 4 to 6.

[0062] Figure 5 is a perspective view illustrating the attachment of the battery structure shown in Figure 2 to the slewing frame. Figure 6 is a side view showing the battery structure shown in Figure 2 attached to the slewing frame.

[0063] As shown in Figure 5, the battery structure 30 is attached to the main beam MB of the slewing frame 20 by fastening members 50, such as bolts. The fastening members 50 are fastened to the female threaded portion of the battery structure 30 while it is inserted through the main beam MB of the slewing frame 20.

[0064] As shown in Figure 4(B), the main beam MB has a pair of left and right vertical plates SP and an upper plate TP. Each of the left and right vertical plates SP is connected to the bottom plate BP of the slewing frame 20, for example, by welding. Each of the left and right vertical plates SP rises upward from the bottom plate BP of the slewing frame 20. The left and right vertical plates SP rise upward parallel to each other with a gap IS in between.

[0065] The upper plate TP is connected to both upper ends of the pair of left and right vertical plates SP, for example, by welding. The upper plate TP closes the gap IS between the pair of left and right vertical plates SP. As a result, the pair of left and right vertical plates SP of the main beam MB, the upper plate TP, and the bottom plate BP of the slewing frame 20 form a box structure with an internal space IS.

[0066] The lower end of the support column 37 in the battery structure 30 is in contact with the upper plate TP of the main beam MB. The support column 37 is located directly above the main beam MB.

[0067] The bottom plate BP and the top plate TP are each provided with through holes BP1 and TP1 for passing fastening members 50 through. The through holes BP1 and TP1 provided in the bottom plate BP and the top plate TP are connected to the internal space IS of the box structure.

[0068] The fastening member 50 is inserted from the underside of the slewing frame 20 through the through hole BP1 in the bottom plate BP, passes between the pair of left and right vertical plates SP (internal space IS of the box structure), is inserted through the through hole TP1 in the top plate TP, and is then fastened to the battery structure 30. In this way, the battery structure 30 is fixed to the main beam MB of the slewing frame 20.

[0069] As shown in Figure 6, for example, two fastening members 50 are fastened to one support column 37. The two fastening members 50 fastened to one support column 37 are arranged in the front-to-back direction. Each of the two fastening members 50 is positioned directly below the support column 37. The fastening members 50 are screwed into female threaded portions provided on the lower surface of the support column PRa.

[0070] As shown in Figures 4(A) and 6, the support column 37 has a lower part and an upper part located above the lower part. Specifically, if support column PRa is the lower part of the support column 37, then support column PRb and PRc are the upper parts of the support column 37. Also, if support column PRb is the lower part of the support column 37, then support column PRc is the upper part of the support column 37.

[0071] The diameter of the lower part of the support column 37 is larger than the diameter of the upper part of the support column 37. Specifically, the diameter D1 of support column PRa is larger than the diameters D2 of support column PRb and D3 of support column PRc. Also, the diameter D2 of support column PRb is larger than the diameter D3 of support column PRc. Because the diameter of the lower part of the support column 37 is larger than the diameter of the upper part of the support column 37, the support of the battery structure 30 by the support column 37 is stable.

[0072] <Effects> Next, the effects of this embodiment will be described.

[0073] When arranging the battery structure 30 or the battery mounting support, it is common to add components such as brackets to support the battery structure 30, etc.

[0074] In this embodiment, as shown in Figure 5, the battery structure 30 or battery mounting support is positioned on the main beam MB of the slewing frame 20. This means that only the main beam MB needs to be redesigned, without adding any new brackets or other components to the slewing frame 20 to support the battery structure 30, etc. Therefore, when applying the slewing frame 20 of the electric excavator 100, the battery structure 30, etc. can be appropriately supported on the slewing frame 20 with a simple structure.

[0075] Furthermore, the main beam MB extends in the front-to-back direction from the center of the slewing frame 20 in the left-to-right direction. This allows the battery structure 30 or the battery mounting support to be supported at the center of the slewing frame 20. As a result, when the electric excavator 100 is slewing, the centrifugal force during slewing is less likely to act on the part of the slewing frame 20 that supports the battery structure 30, etc. Therefore, displacement of the battery structure 30, etc., relative to the slewing frame 20 due to centrifugal force is less likely to occur.

[0076] Furthermore, in this embodiment, as shown in Figure 4(A), at least one support column 37 is located directly above the main beam MB. This allows the load of the battery structure 30 or battery mounting support acting on the support column 37 to be directly supported by the main beam MB. As a result, the battery structure 30 and the like can be stably supported by the main beam MB.

[0077] As shown in Figure 4(B), the vertical plates SP of the main beam MB are welded to the bottom plate BP and the top plate TP on the outside of the box structure, but they are not welded to the bottom plate BP and the top plate TP on the inside of the box structure. As a result, the connection strength between the vertical plates SP and the bottom plate BP, and between the vertical plates SP and the top plate TP, may be insufficient.

[0078] However, in this embodiment, as shown in Figure 4(B), the battery structure 30 or battery mounting support is fixed to the main beam MB by fastening with at least one fastening member 50 that passes between a pair of vertical plates SP in the main beam MB. By tightening the fastening member 50 against the female screw portion of the battery structure 30, the bottom plate BP and the top plate TP are pressed against the pair of vertical plates SP. This reinforces the connection strength between the vertical plates SP and the bottom plate BP, and the connection strength between the vertical plates SP and the top plate TP.

[0079] Furthermore, in this embodiment, as shown in Figure 6, at least one fastening member 50 is positioned directly below the support column 37. This allows the battery structure 30 or the battery mounting support to be fixed by the fastening member 50 directly below the support column 37, where the load of the battery structure 30 or the battery mounting support is applied. As a result, the battery structure 30 or the battery mounting support can be firmly supported.

[0080] Furthermore, in this embodiment, as shown in Figure 3, the mounting frame 38 is attached to both the frame plate FBa (first frame plate) located in front of the battery frame 31 and the frame plate FBa (second frame plate) located behind the battery frame 31. The mounting frame 38 allows the pitch in the front-rear direction between the support column 37 supported by the frame plate FBa located in front of the battery frame 31 and the support column 37 supported by the frame plate FBa located behind the battery frame 31 to be set to a predetermined pitch. This makes it easier to align the battery structure 30 or the battery mounting support with respect to the swivel frame 20 when attaching the battery structure 30 or the battery mounting support to the swivel frame 20.

[0081] <Variation> Next, modified examples of the mounting frame will be explained using Figures 7 and 8.

[0082] Figure 7 is an exploded perspective view of a modified battery structure with a mounting frame. Figure 8 is a perspective view showing the battery structure shown in Figure 7 mounted on a swivel frame.

[0083] As shown in Figure 7, the battery structure 30 of this modified example has two mounting frames 38b. Each of the two mounting frames 38b has a horizontal plate 38ba and a downward-hanging plate 38bb.

[0084] The transverse plate 38ba has a flat shape and extends in the front-rear direction along the main beam MB above the main beam MB. The hanging plate 38bb is connected to one end of the transverse plate 38ba in the left-right direction. The hanging plate 38bb extends downward from the transverse plate 38ba. The hanging plate 38bb is connected to the transverse plate 38ba over its entire length in the front-rear direction. The hanging plate 38bb has a notch 38bc that opens downward.

[0085] The horizontal plate 38ba and the hanging plate 38bb may be constructed, for example, by bending a single piece of steel. Alternatively, the mounting frame 38b may be constructed by connecting the hanging plate 38bb to the horizontal plate 38ba, for example, by welding.

[0086] As shown in Figure 8, the slewing frame 20 has rib portions RP extending from the main beam MB in the left-right direction. The mounting frame 38b is attached to the lower end of the support column 37. The mounting frame 38b is positioned at the upper end of the main beam MB. The mounting frame 38b is positioned between the main beam MB and the support column 37. When the mounting frame 38b is positioned on the main beam MB, the rib portions RP extending from the main beam MB in the left-right direction are received in the notch 38bc of the mounting frame 38b.

[0087] As described above, the mounting frame 38b has a horizontal plate 38ba that extends in the front-rear direction along the main beam MB on top of the main beam MB, and a downward-hanging plate 38bb that extends downward from the horizontal plate 38ba. This makes it easy to position the battery structure 30 in the left-right direction relative to the main beam MB.

[0088] Furthermore, the hanging plate 38bb has a notch 38bc that receives the rib portion RP extending from the main beam MB in the left-right direction. By positioning the battery structure 30 so that the notch 38bc receives the rib portion RP in this way, the front-rear positioning of the battery structure 30 becomes easier.

[0089] Next, a modified example of the mounting position using fastening members will be explained with reference to Figure 9. Figure 9 is a cross-sectional view in a side view showing a modified example of the mounting position by the fastening member. As shown in Figure 9, the fastening member 50, such as a bolt, may be positioned at a location other than directly below the support column 37. Specifically, the multiple fastening members 50 may include a first fastening member 50f positioned in front of the support column 37 and a second fastening member 50s positioned behind the support column 37. In this case, the support column 37 is sandwiched in the front-rear direction by the first fastening member 50f and the second fastening member 50s.

[0090] In this case, each of the first fastening member 50f and the second fastening member 50s may be fastened to the mounting frame 38b. The male threaded portion of each of the first fastening member 50f and the second fastening member 50s may be fastened to a female threaded portion provided on the mounting frame 38b, or it may be fastened through the mounting frame 38b to a nut on the mounting frame 38b.

[0091] In this manner, with the first fastening member 50f positioned in front of the support column 37 and the second fastening member 50s positioned behind the support column 37, the tilting (tilting) of the battery structure 30 in the front-to-back direction is suppressed even when acceleration is applied to the electric shovel 100 in the front-to-back direction due to excavation.

[0092] Note that, among the modified configurations shown in Figures 7 to 9, the configurations other than those described above are substantially the same as those of the embodiments shown in Figures 1 to 6, so the same elements are denoted by the same reference numerals and their descriptions are not repeated. In the modified configurations shown in Figures 7 and 8, the battery structure 30 may be a battery mounting support from which the battery pack 32 has been removed.

[0093] Furthermore, although the above embodiments and modifications describe an electric excavator 100 without a counterweight, the electric excavator 100 may have a counterweight. If the electric excavator 100 has a counterweight, the counterweight may be arranged in the left-right direction of the battery structure 30.

[0094] Furthermore, although a frame 34 was described above as a member for fixing multiple battery assemblies AS to each other, the multiple battery assemblies AS may also be fixed to each other by cover members that cover the left and right ends of the multiple battery assemblies AS.

[0095] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims rather than by the foregoing description, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of Symbols]

[0096] 1 Main body, 2 Working equipment, 3 Slewing body, 4 Cab, 4S Driver's seat, 5 Running body, 5Cr Tracks, 5M Travel motor, 6 Boom, 7 Arm, 8 Bucket, 9 Exterior cover, 10 Boom cylinder, 11 Arm cylinder, 12 Bucket cylinder, 13 Boom foot pin, 14 Boom top pin, 15 Arm top pin, 17 Bucket link, 20 Slewing frame, 30 Battery structure, 31 Battery frame, 32 Battery pack, 33 Bracket body, 33a Bracket, 33b Support plate, 34 Frame, 35 Frame body, 36a, 36b, 36c Frame members, 37 Support column, 38, 38b Mounting frame, 38ba Side plate, 38bb Downward plate, 38bc Notch, 39 Connecting frame, 40 Damper mount, 50 Fastening member, 50f First fastening member, 50s Second fastening member, 100 electric excavator, AS battery assembly, BP bottom plate, BP1, TP1 through hole, CF center frame, DL left deck, DR right deck, FBa, FBb, FBc frame plate, IS internal space (gap), PRa, PRb, PRc support column, RP rib, RX pivot axis, SP vertical plate, TH1, TH2 through hole, TP top plate.

Claims

1. The rotating frame comprises a base plate and a main beam rising upward from the base plate, the main beam extending in the front-rear direction from the center of the rotating frame in the left-right direction, and further comprising a battery mounting support positioned on the main beam of the rotating frame. The battery mounting support has at least one support column extending in the vertical direction, The at least one support column is located directly above the main beam, Each of the main beams has a pair of vertical plates that rise upward from the base plate. An electric excavator, wherein the battery mounting support is fixed to the main beam by fastening to at least one fastening member that passes between the pair of vertical plates.

2. The electric excavator according to claim 1, further comprising a battery supported by the battery mounting support.

3. The electric shovel according to claim 1, wherein the at least one fastening member is located directly below the support column.

4. The electric shovel according to claim 1, wherein the at least one fastening member comprises a first fastening member positioned in front of the support column and a second fastening member positioned behind the support column.

5. The battery mounting support has a mounting frame that is positioned on the main beam, The electric excavator according to any one of claims 1 to 4, wherein the mounting frame has a horizontal plate extending in the front-rear direction along the main beam on top of the main beam and a downward-extending plate extending downward from the horizontal plate.

6. The aforementioned slewing frame has rib portions extending from the main beam in the left-right direction, The electric shovel according to claim 5, wherein the hanging plate has a notch for receiving the rib portion.

7. The battery mounting support comprises a battery frame, a mounting frame, and at least one frame plate. The at least one support column comprises a first support column positioned in front of the battery frame and a second support column positioned behind the battery frame. The at least one frame plate comprises a first frame plate attached to the first support column and a second frame plate attached to the second support column. The electric excavator according to any one of claims 1 to 4, wherein the mounting frame is attached to both the first frame plate and the second frame plate.

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