electric shovel

Abstract

The slewing frame (20) rotates around the center of rotation (CP). The battery (31) is supported on the slewing frame (20). The electric motor (33) is supported on the slewing frame (20) and supplies power from the battery (31). The hydraulic pump (34) is supported on the slewing frame (20), driven by the electric motor (33), and is positioned closer to the center of rotation CP than the electric motor (33) when viewed in a plane.

Description

Technology Field

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

[0002] Conventionally, battery-driven electric shovels are disclosed, for example, in Japanese Patent Publication No. Hei 11-140906 (Patent Document 1) and Japanese Patent Publication No. 2012-1933 (Patent Document 2). Patent Documents 1 and 2 disclose a small electric shovel in which a battery, an electric motor, and a hydraulic pump are arranged in this order from the rear to the front of a slewing body. Prior art literature

[0003] Japanese Patent Publication No. Hei 11-140906, Japanese Patent Publication No. 2012-1933 The problem to be solved

[0004] The battery is positioned at the rear of the slewing body to serve as a counterweight. However, in the case of a large battery-driven electric shovel (hereinafter referred to as "electric shovel"), the space occupied by the battery becomes large. Consequently, the battery protrudes from the area where it is placed as a counterweight into the machine room, making it difficult to place necessary components such as the electric motor and hydraulic pump in the machine room. Therefore, if the arrangement of the battery, electric motor, and hydraulic pump as described in Patent Documents 1 and 2 is applied to a large electric shovel, the hydraulic piping becomes long, pressure loss occurs in the hydraulic system, and energy efficiency deteriorates.

[0005] The object of the present disclosure is to provide an electric shovel that can shorten the length of hydraulic piping. means of solving the problem

[0006] The electric shovel of the present disclosure comprises a hydraulic actuator, a slewing frame, a battery, an electric motor, and a hydraulic pump. The slewing frame rotates around a center of rotation. The battery is supported by the slewing frame. The electric motor is supported by the slewing frame and drives the battery as a power source. The hydraulic pump is supported by the slewing frame and drives the electric motor to supply oil to the hydraulic actuator, and is positioned closer to the center of rotation than the electric motor when viewed in a plane. Effects of the invention

[0007] According to the present disclosure, an electric shovel that can shorten the length of hydraulic piping can be realized. Brief explanation of the drawing

[0008] [Fig. 1] This is a perspective view schematically showing the configuration of an electric shovel in one embodiment of the present disclosure. [Fig. 2] This is a perspective view showing the slewing frame and the configuration of the load in the electric shovel shown in Fig. 1. [Fig. 3] This is a plan view showing the slewing frame and the configuration of the load in the electric shovel shown in Fig. 1. [Fig. 4] This is a side view showing the hydraulic pump positioned below the hydraulic fluid tank. Specific details for implementing the invention

[0009] Hereinafter, embodiments of the present disclosure will be described based on the drawings.

[0010] In the specifications and drawings, the same reference numerals are used for identical components or corresponding components, and redundant descriptions are not repeated. Additionally, in the drawings, configurations may be omitted or simplified for convenience of explanation. Furthermore, at least some of the embodiments and variations may be combined arbitrarily.

[0011] In the following description, “up,” “down,” “front,” “back,” “left,” and “right” refer to directions based on the operator seated in the driver’s seat (4S) inside the driver’s cabin (4) shown in FIG. 1.

[0012] Components of an Electric Shovel

[0013] First, the configuration of the electric shovel of the present embodiment will be explained with reference to FIG. 1.

[0014] FIG. 1 is a perspective view schematically illustrating the configuration of an electric shovel in one embodiment of the present disclosure. As shown in FIG. 1, the electric shovel (100) has a main body (1) and a working device (2) operated by hydraulic pressure. The main body (1) has a turning body (3) and a driving body (5). The driving body (5) has a pair of crawler belts (5Cr) and a driving motor (5M). The electric shovel (100) can be driven by the rotation of the crawler belts (5Cr). The driving motor (5M) is installed as a driving source for the driving body (5). The driving motor (5M) is a hydraulic motor operated by hydraulic pressure. Also, the driving body (5) may have wheels (tires). The driving motor (5M) or the turning motor (37) may be an electric motor.

[0015] The swivel body (3) is positioned on the driving body (5) and is also supported by the driving body (5). The swivel body (3) can rotate relative to the driving body (5) around the pivot axis (RX) by means of a swivel motor (37) (Fig. 3). The swivel motor (37) is a hydraulic motor operated by hydraulic pressure. The pivot axis (RX) is an imaginary straight line that serves as the pivot center of the swivel body (3).

[0016] The slewing body (3) has a cab (4). Inside the cab (4), a driver's seat (4S) is installed for an operator to sit on. The operator (passenger) can sit in the cab (4) and operate the work machine (2), operate the slewing body (3) relative to the driving body (5), and operate the driving of the electric shovel (100) by the driving body (5).

[0017] The slewing body (3) has an exterior cover (9). The exterior cover (9) covers the machine room. In the machine room, a battery, inverter, electric motor, hydraulic pump, slewing motor, switching valve, hydraulic fluid tank, etc. are arranged.

[0018] The work machine (2) is supported on the slewing body (3). The work machine (2) has a boom (6), an arm (7), and a bucket (8). The work machine (2) further has a boom cylinder (10), an arm cylinder (11), and a bucket cylinder (12).

[0019] The boom (6) is rotatably connected to the main body (1) {driving body (5) and rotating body (3)}. Specifically, the base of the boom (6) is rotatably connected to the rotating body (3) using the boom foot pin (13) as a pivot point.

[0020] The arm (7) is rotatably connected to the boom (6). Specifically, the base of the arm (7) is rotatably connected to the front end of the boom (6) using the boom top pin (14) as a pivot point. The bucket (8) is rotatably connected to the arm (7). Specifically, the base of the bucket (8) is rotatably connected to the front end of the arm (7) using the arm top pin (15) as a pivot point.

[0021] One end of the boom cylinder (10) is connected to the pivot body (3), and the other end is connected to the boom (6). The boom (6) can be driven relative to the main body (1) by the boom cylinder (10). By this driving, the boom (6) can rotate in the up and down direction relative to the pivot body (3) using the boom foot pin (13) as a pivot point.

[0022] 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 relative to the boom (6) by the arm cylinder (11). By this driving, the arm (7) can rotate relative to the boom (6) in an up-and-down direction or a forward-and-backward direction using the boom top pin (14) as a pivot point.

[0023] 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) can be driven relative to the arm (7) by the bucket cylinder (12). By this driving, the bucket (8) can rotate up and down relative to the arm (7) using the arm top pin (15) as a pivot point.

[0024] Each of the boom cylinder (10), arm cylinder (11) and bucket cylinder (12) is a hydraulic cylinder and is driven by hydraulic pressure.

[0025] <Configuration of the Slewing Frame and Arrangement of Mounts>

[0026] Next, the configuration of the slewing frame in the electric shovel shown in FIG. 1 and the arrangement of the mounting portion of the slewing frame will be explained using FIG. 2 and FIG. 3.

[0027] FIGS. 2 and FIGS. 3 are a perspective view and a plan view, respectively, showing the configuration of the pivot frame and the arrangement of the load in the electric shovel shown in FIG. 1. As shown in FIG. 2, the pivot body (3) ( FIG. 1) has a pivot frame (20). The pivot frame (20) pivots relative to the driving body (5) ( FIG. 1) around a pivot axis (RX).

[0028] The slewing 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 slewing frame (20) in the left-right direction. The left deck (DL) is positioned to the left of the center frame (CF). The right deck (DR) is positioned to the right of the center frame (CF).

[0029] The center frame (CF) has a pair of center beams (CB). The pair of center beams (CB) are arranged to face each other with a gap in the left and right directions. The pair of center beams (CB) support the work machine (2) (Fig. 1). Thus, the center frame (CF) supports the work machine (2).

[0030] Each of the pair of center beams (CB) has a through hole (TH1, TH2). A boom foot pin (13) (Fig. 1) is inserted into the through hole (TH1). The boom (6) (Fig. 1) is rotatably supported on the pair of center beams (CB) by the boom foot pin (13).

[0031] A pin (not shown) supporting the boom cylinder (10) (Fig. 1) is inserted into the through hole (TH2). The boom cylinder (10) is rotatably supported on the center beam (CB) by this pin.

[0032] The front end (FL) of the left deck (DL) and the front end (FR) of the right deck (DR) are each located forward of the front end (FF) of the center frame (CF). The rear end (RC) of each of the pair of center beams (CB) is located rearward of the rear end (RL) of the left deck (DL) and the rear end (RR) of the right deck (DR). The rear end (RC) of each of the pair of center beams (CB) becomes the rearmost end of the center frame (CF).

[0033] A bracket (22) is connected to the rear upper surface of a pair of center beams (CB), for example by welding. The rear end (22R) of the bracket (22) is located further forward than each rear end (RC) of the pair of center beams (CB), and further backward than the rear end (RL) of the left deck (DL) and the rear end (RR) of the right deck (DR). The front end (22F) of the bracket (22) is located further forward than the rear end (RL) of the left deck (DL) and the rear end (RR) of the right deck (DR).

[0034] As shown in FIG. 3, the slewing frame (20) supports a battery (31), an inverter (32), an electric motor (33), a hydraulic pump (34), a switching valve (35), a hydraulic fluid tank (36), a slewing motor (37), and other components. The output shaft of the electric motor (33) is mechanically connected to the input shaft of the hydraulic pump (34).

[0035] The battery (31) includes, for example, a plurality of battery modules, and each of the plurality of battery modules has a battery cell. The battery (31) is a power source and accumulates electrical energy obtained from an external power source. The battery (31) extracts the accumulated electrical energy as electromotive force. The battery (31) supplies power to the inverter (32) through electrical wiring.

[0036] The inverter (32) converts the DC power, which is the output of the battery (31), into AC power with controlled frequency, etc. The inverter (32) supplies AC power to the electric motor (33) through electrical wiring. In this way, the inverter (32) controls the operation of the electric motor (33). In this manner, the electrical energy accumulated in the battery (31) is supplied to the electric motor (33).

[0037] The electric motor (33) is driven by alternating current power supplied from the inverter (32) using the battery (31) as a power source. The rotational speed of the electric motor (33) is controlled by the frequency of the alternating current power supplied from the inverter (32). As the electric motor (33) is driven, the hydraulic pump (34) to which the driving force of the electric motor (33) is transmitted is driven.

[0038] The hydraulic pump (34) supplies hydraulic fluid to each hydraulic actuator (5M, 37, 10-12) through the switching valve (35) (main valve) by driving. Specifically, the hydraulic pump (34) draws hydraulic fluid from the hydraulic fluid tank (36) through the hydraulic piping by driving. The hydraulic fluid tank (36) serves to supply oil to the hydraulic pump (34). The hydraulic fluid discharged from the hydraulic pump (34) is supplied to the switching valve (35) through the hydraulic piping.

[0039] The switching valve (35) is composed of a plurality of control valves, pilot valves, etc. The switching valve (35) is positioned in the oil path (hydraulic piping) between the hydraulic pump (34) and the hydraulic actuator. The switching valve (35) supplies and discharges hydraulic fluid drawn from the hydraulic fluid tank (36) by the hydraulic pump (34) to the hydraulic actuator. The hydraulic actuator has, for example, a hydraulic cylinder (boom cylinder (10), arm cylinder (11), bucket cylinder (12)), a swing motor (37), and a travel motor (5M). Each hydraulic actuator (5M, 37, 10-12) is operated by supplying and discharging hydraulic fluid from the switching valve (35).

[0040] The opening and closing of each valve in the switching valve (35) is controlled according to the driving operation of the operator. Thus, the main body (1) and the working device (2) of the electric shovel (100) can be operated according to the driving operation of the operator who is in the driver's cabin (4). Specifically, the operator can operate the working device (2) by operating the hydraulic cylinders (10-12), operate the turning of the turning body (3) by operating the turning motor (37), and operate the driving of the electric shovel (100) by operating the driving motor (5M).

[0041] The battery (31) is supported on the pivot frame (20) by being placed on the bracket (22). The left-right dimension W1 of the battery (31) is larger than the left-right dimension W2 of the center frame (CF). The left-right dimension W1 of the battery (31) is the dimension from the right end (RE) to the left end (LE) of the battery (31). The left-right dimension W2 of the center frame (CF) is the dimension from the right end to the left end of the center frame (CF).

[0042] Therefore, when viewed in a plane, the right end (RE) of the battery (31) is located directly above the right deck (DR), and the left end (LE) of the battery (31) is located directly above the left deck (DL). In this specification, "when viewed in a plane" means a viewpoint looking down from above in a direction (up and down direction) orthogonal to the bottom plate (BP) of the pivot frame (20).

[0043] The electric shovel (100) of this embodiment does not have a counterweight, and the battery (31) acts as the counterweight. For this reason, the battery (31) is positioned at the rear of the swivel body (3).

[0044] The area behind the rear end (RL) of the left deck (DL) and the rear end (RR) of the right deck (DR), respectively, is the area where the counterweight is originally placed. In order to serve as a counterweight, the battery (31) has a portion located behind the rear end (RL) of the left deck (DL) and the rear end (RR) of the right deck (DR), respectively, when viewed in a plane. Therefore, the rear end (31R) of the battery (31) is located behind the rear end (RL) of the left deck (DL) and the rear end (RR) of the right deck (DR), respectively, when viewed in a plane.

[0045] However, in large electric shovels, the battery (31) is also enlarged. If the height of the battery is increased, the rear visibility of the operator seated in the driver's seat (4S) is reduced. Therefore, the battery (31) does not fully fit into the counterweight placement area and protrudes into the machine room. As a result, when viewed from a planar perspective, the front end (31F) of the battery (31) is located further forward than the rear end (RL) of the left deck (DL) and the rear end (RR) of the right deck (DR), respectively. Because the battery (31) protrudes into the machine room in this way, the placement of other components other than the battery (31) is restricted.

[0046] And the machine room refers to a space located ahead of the rear end (RL) of the left deck (DL) and the rear end (RR) of the right deck (DR), respectively, and is a space covered by an exterior cover (9).

[0047] In this embodiment, an inverter (32), an electric motor (33), a hydraulic pump (34), and a hydraulic fluid tank (36) are each supported on the right deck (DR). Each of the inverter (32), the electric motor (33), the hydraulic pump (34), and the hydraulic fluid tank (36) is positioned on the front side (the front (FR) side of the right deck (DR)) relative to the battery (31).

[0048] The hydraulic fluid tank (36), hydraulic pump (34), electric motor (33), and inverter (32) are arranged in this order from the rear (RR) side of the right deck (DR) toward the front (FR) side. That is, the hydraulic fluid tank (36) is placed in front of the battery (31), the hydraulic pump (34) is placed in front of the hydraulic fluid tank (36), the electric motor (33) is placed in front of the hydraulic pump (34), and the inverter (32) is placed in front of the electric motor (33).

[0049] When viewed from a planar perspective, gaps are formed between the front end (31F) of the battery (31) and the rear end of the hydraulic fluid tank (36), between the front end of the hydraulic fluid tank (36) and the rear end of the hydraulic pump (34), and between the front end of the electric motor (33) and the rear end of the inverter (32).

[0050] The rear end of the hydraulic pump (34) is located on the rear side (the rear end (RR) side of the right deck (DR)) relative to the position of the through hole (TH1) in the front-rear direction. The rear end of the electric motor (33) is located on the front side (the front end (FR) side of the right deck (DR)) relative to the position of the through hole (TH1) in the front-rear direction. The rear end of the inverter (32) is located on the front side (the front end (FR) side of the right deck (DR)) relative to the position of the front end (FF) of the center frame (CF) in the front-rear direction.

[0051] When viewed from a planar perspective, the hydraulic fluid tank (36) is positioned between the hydraulic pump (34) and the battery (31). When viewed from a planar perspective, the hydraulic pump (34) is positioned closer to the battery (31) than to the electric motor (33).

[0052] The center frame (CF) supports each of the switching valve (35) and the pivot motor (37). Each of the switching valve (35) and the pivot motor (37) is positioned in an area sandwiched between a pair of center beams (CB) when viewed in a plane.

[0053] Each of the switching valve (35) and the pivot motor (37) is positioned on the front side (front (FF) side of the center frame (CF)) relative to the battery (31).

[0054] The switching valve (35) and the pivot motor (37) are arranged in this order from the rear end (RC) side of the center frame (CF) toward the front end (FF) side. That is, the switching valve (35) is positioned in front of the battery (31), and the pivot motor (37) is positioned in front of the switching valve (35). The switching valve (35) is positioned between the battery (31) and the pivot motor (37), and is positioned closer to the battery (31) than to the pivot motor (37).

[0055] An opening (21) is positioned in front of the pivot motor (37). The opening (21) is a through hole formed in the bottom plate (BP) of the pivot frame (20). For example, a swivel joint (not shown) is inserted into the opening (21). The opening (21) has a roughly circular shape when viewed from a plane. In addition, a projection protruding inwardly from the edge of the circular opening (21) may be installed to secure the body of the swivel joint. A pivot axis (RX) passes through the center of the roughly circular shape of the opening (21) when viewed from a plane. Therefore, the center CP of the roughly circular shape of the opening (21) when viewed from a plane becomes the pivot center (rotation center) for the driving body (5) of the pivot body (3). That is, the pivot frame (20) pivots around the pivot center CP.

[0056] The hydraulic pump (34) is positioned closer to the pivot center CP (pivot axis (RX)) than the electric motor (33) when viewed in a plane. Specifically, when viewed in a plane, the shortest distance L1 between the pivot center CP and the hydraulic pump (34) is smaller than the shortest distance L2 between the pivot center CP and the electric motor (33).

[0057] The hydraulic pump (34) is positioned closer to the switching valve (35) than to the electric motor (33). Specifically, when viewed in a plane, the shortest distance L3 between the switching valve (35) and the hydraulic pump (34) is smaller than the shortest distance L4 between the switching valve (35) and the electric motor (33).

[0058] The driver's cabin (4) (Fig. 1) is supported on the entire left deck (DL). Additionally, the inverter (32), electric motor (33), hydraulic pump (34), and hydraulic fluid tank (36) are each supported on the left deck (DL), and the driver's cabin (4) may be placed on the right deck (DR).

[0059] In addition, although the above embodiment described a configuration in which the hydraulic pump and the hydraulic fluid tank are arranged in the front-rear direction, the hydraulic pump and the hydraulic fluid tank may be arranged vertically relative to each other.

[0060] FIG. 4 is a side view (A) and a top view (B) showing a hydraulic pump positioned below the hydraulic fluid tank. As shown in FIG. 4 (A) and (B), the hydraulic fluid tank (36) is positioned directly above the hydraulic pump (34). Therefore, when viewed from the top view shown in FIG. 4 (B), the entire hydraulic pump (34) overlaps with the hydraulic fluid tank (36). Also, unlike the arrangement in FIG. 3, if the hydraulic fluid tank (36) is positioned in front of the right deck (DR), it may be located directly above the electric motor (33). In this case, part or all of the electric motor (33) overlaps with the hydraulic fluid tank (36).

[0061] As shown in (A) of FIG. 4, in this arrangement, the lower surface (LS2) of the hydraulic fluid tank (36) is located above the hydraulic pump (34). Therefore, the oil pipe (OL) connecting the hydraulic fluid tank (36) and the hydraulic pump (34) is connected to the lower surface (LS2) of the hydraulic fluid tank (36) at a position higher than the hydraulic pump (34). The oil pipe (OL) extends downward from the connection point with the hydraulic fluid tank (36) at the rear of the hydraulic pump (34) and is connected to the lower surface (LS1) of the hydraulic pump (34) through the space between the lower surface (LS1) of the hydraulic pump (34) and the bottom plate (BP) of the slewing frame (20).

[0062] <Effect>

[0063] Next, the effects of the present embodiment will be explained.

[0064] As shown in FIG. 3, the supply of hydraulic fluid from the switching valve (35) to the driving motor (5M) (Fig. 1) is carried out through a swivel joint inserted into the opening (21) of the slewing frame (20). Additionally, the slewing motor (37) is positioned near the slewing center CP so that the rotation axis of the slewing motor (37) is engaged with the slewing gear. Additionally, the working device (2) is supported on the slewing frame (20) near the slewing center CP.

[0065] Therefore, by placing the switching valve (35) close to the pivot center CP, the length of the hydraulic piping from the switching valve (35) to the driving motor (5M), pivot motor (37), and hydraulic cylinders (10-12) can be shortened. Accordingly, by placing the hydraulic pump (34) close to the pivot center CP, the length of the hydraulic piping from the hydraulic pump (34) to the switching valve (35) can also be shortened.

[0066] In this embodiment, as shown in FIG. 3, the hydraulic pump (34) is positioned closer to the pivot center CP than the electric motor (33) when viewed from a planar perspective. Therefore, as described above, the length of the hydraulic piping from the hydraulic pump (34) through the switching valve (35) to each hydraulic actuator (5M, 37, 10-12) can be shortened. Accordingly, pressure loss in the hydraulic system can be suppressed, and good energy efficiency can be obtained.

[0067] In addition, according to the present embodiment, as shown in FIG. 3, the hydraulic pump (34) is positioned closer to the switching valve (35) than to the electric motor (33). This allows the length of the hydraulic piping from the hydraulic pump (34) to the switching valve (35) to be shortened. Therefore, the pressure loss in the hydraulic pressure from the hydraulic pump (34) to the switching valve (35) can be further suppressed, and better energy efficiency can be obtained.

[0068] In addition, according to the present embodiment, as shown in FIG. 3, the electric motor (33) and the hydraulic pump (34) are supported on either the right deck (DR) or the left deck (DL). Thus, even when the battery (31) is enlarged, the electric motor (33) and the hydraulic pump (34) can be placed on the pivot frame (20).

[0069] In addition, according to the present embodiment, as shown in FIG. 3, the battery (31) has a portion located further back than the rear end (RR) of the right deck (DR) and the rear end (RL) of the left deck (DL) in the front-rear direction. By doing so, the battery (31) can function as a counterweight.

[0070] In addition, according to the present embodiment, as shown in FIG. 3, when viewed from a planar perspective, the switching valve (35) is positioned in an area sandwiched between a pair of center beams (CB). This allows the length of the hydraulic piping extending from the switching valve (35) to each hydraulic actuator (5M, 37, 10-12) to be shortened.

[0071] In addition, according to the present embodiment, as shown in FIG. 3, a hydraulic fluid tank (36) is positioned between the hydraulic pump (34) and the battery (31) when viewed from a planar perspective. This allows the length of the oil pipe connecting the hydraulic pump (34) and the hydraulic fluid tank (36) to be shortened.

[0072] In addition, according to the present embodiment, as shown in FIG. 4, the hydraulic pump (34) is positioned below the hydraulic fluid tank (36). This improves the oil suction performance of the hydraulic pump (34). Furthermore, by arranging the hydraulic pump (34) and the hydraulic fluid tank (36) vertically, the hydraulic pump (34) and the hydraulic fluid tank (36) can be compactly positioned in the front-rear direction.

[0073] In addition, according to the present embodiment, as shown in FIG. 3, the inverter (32) is positioned in front of the electric motor (33). This allows the length of the electrical wiring connecting the inverter (32) and the electric motor (33) to be shortened.

[0074] And, if the electric shovel (100) is remotely operated and there is no need for an operator to board, the driver's cabin (4) may be omitted.

[0075] The embodiments disclosed herein should be considered as illustrative and not limiting in all respects. The scope of the invention is defined by the claims, not by the description above, and is intended to include all modifications within the meaning and scope equivalent to the claims. Explanation of the symbols

[0076] 1: Main body, 2: Implement, 3: Slewing body, 4: Cab, 4S: Operator's seat, 5: Traveling body, 5Cr: Crawler belt, 5M: Travel motor, 6: Boom, 7: Arm, 8: Bucket, 9: Outer 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, 21: Opening, 22: Bracket, 22F, 31F, FF, FL, FR: Front end, 22R, 31R, RC, RL, RR: Rear end, 31: Battery, 32: Inverter, 33: Electric motor, 34: Hydraulic pump, 35: Switching valve, 36: Hydraulic fluid tank, 37: Slewing motor, 100: Electric shovel, BP: Floor plate, CB: Center beam, CF: Center frame, CP: Slewing center, DL: Left deck, DR: Right deck, LE: Left end, LS1, LS2: Bottom surface, OL: Oil piping, RE: Right end, RX: Slewing axis (slewing center), TH1, TH2: Through hole.

Claims

Claim 1 A workpiece; a hydraulic actuator for driving the workpiece; a slewing frame positioned on the upper part of a vehicle body and slewing about a pivot center by a slewing motor; a battery supported by the slewing frame; an electric motor supported by the slewing frame and driven by the battery as a power source; a hydraulic pump driven by the electric motor to supply oil to the hydraulic actuator; An electric shovel comprising a switching valve disposed in a fluid path between the hydraulic pump and the hydraulic actuator, wherein the slewing frame has a center frame supporting the workpiece and a pair of decks disposed on the left and right sides of the center frame, wherein the battery is disposed to have a portion located rearward from the rear end position of the pair of decks, wherein the electric motor and the hydraulic pump are supported on one of the pair of decks, wherein the center frame has a pair of center beams supporting the workpiece, wherein, when viewed in a plane, the switching valve and the slewing motor are disposed in an area sandwiched between the pair of center beams, and the hydraulic pump is adjacent to the switching valve and the slewing motor with the center beams in between. Claim 2 In claim 1, the hydraulic pump is an electric shovel positioned closer to the switching valve than the electric motor. Claim 3 An electric shovel according to claim 1 or 2, wherein electric energy accumulated in the battery is supplied to the electric motor, the electric motor is driven by the supply of electric energy, and oil from the hydraulic pump is supplied to the hydraulic actuator through the switching valve by the driving of the electric motor. Claim 4 An electric shovel according to claim 1 or 2, further comprising a hydraulic fluid tank for supplying oil to the hydraulic pump, wherein the hydraulic fluid tank is positioned between the hydraulic pump and the battery when viewed in a planar view. Claim 5 An electric shovel according to claim 1 or 2, further comprising a hydraulic fluid tank for supplying oil to the hydraulic pump, wherein the hydraulic pump is positioned below the hydraulic fluid tank. Claim 6 An electric shovel according to claim 1 or 2, further comprising an inverter for controlling the drive of the electric motor, wherein the inverter is positioned in front of the electric motor. Claim 7 In claim 1 or 2, the hydraulic actuator is an electric shovel, which is a hydraulic cylinder that drives the working machine. Claim 8 delete Claim 9 delete Claim 10 delete

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