Swivel work machine

Abstract

To suppress the transmission of vibration from an electric motor and a hydraulic pump to a battery unit.SOLUTION: A turning work machine includes a swivel, the battery unit, a support body supporting the battery unit on the swivel, the electric motor to be driven by electric power the battery unit outputs, the hydraulic pump to be driven by the electric motor to discharge working oil, and a support part supporting the electric motor and the hydraulic pump on the swivel, the support part being separated from the support body and mounted to the swivel via a plurality of mount devices.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a swing working machine such as a backhoe.

Background Art

[0002] A swing working machine disclosed in Patent Document 1 includes a swing base, hydraulic equipment provided on the swing base, a battery, an electric motor driven by electric power output from the battery, and a hydraulic pump that discharges hydraulic oil by the drive of the electric motor, and the battery includes a main secondary battery and an auxiliary secondary battery. Further, the main secondary battery is arranged at the central part of the swing base, the hydraulic pump and the electric motor are arranged at the rear part of the swing base, and the auxiliary secondary battery is arranged at the side part of the swing base.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technique of Patent Document 1, the hydraulic pump, the electric motor, the main secondary battery, and the auxiliary secondary battery are arranged at separate positions respectively. However, vibration generated by the drive of the electric motor or pulsation of the hydraulic pump may reach the battery unit via the swing base. The present invention has been made to solve such problems of the conventional art, and an object thereof is to provide a swing working machine capable of suppressing propagation of vibration from the electric motor and the hydraulic pump to the battery unit.

Means for Solving the Problems

[0005] The slewing work machine comprises a slewing platform, a battery unit, a support body that supports the battery unit on the slewing platform, an electric motor driven by the power output of the battery unit, a hydraulic pump driven by the electric motor that discharges hydraulic fluid, a support section that supports the electric motor and the hydraulic pump on the slewing platform, a first bracket separate from the electric motor and connecting the electric motor and the support section, and a second bracket separate from the hydraulic pump and connecting the hydraulic pump and the support section, wherein the support section is separated from the support body and attached to the slewing platform via a plurality of mounting devices, and the first bracket and the second bracket are The aforementioned support part sandwiched The multiple mounting devices are arranged at intervals in one direction, the electric motor and the hydraulic pump are arranged in a line with the first bracket and the second bracket in between, and in a plan view, the multiple mounting devices are arranged on both sides of the direction perpendicular to the direction of the electric motor and on both sides of the direction perpendicular to the direction of the hydraulic pump, and the mounting device arranged on one side of the respective perpendicular direction of the electric motor and the hydraulic pump has an intermediate position between the mounting device arranged on one side of the electric motor and the mounting device arranged on one side of the hydraulic pump. So that it overlaps projectively with respect to the first bracket in the direction perpendicular to the aforementioned one direction. The mounting device is positioned such that the mounting device positioned on the other side of the orthogonal direction of the electric motor and the hydraulic pump is located at an intermediate position between the mounting device positioned on the other side of the electric motor and the mounting device positioned on the other side of the hydraulic pump. So that it projects onto the support portion in a direction perpendicular to the aforementioned one direction. It will be placed. [Effects of the Invention]

[0006] According to the above-described slewing work machine, it is possible to suppress the transmission of vibrations from the electric motor and hydraulic pump to the battery unit. [Brief explanation of the drawing]

[0007] [Figure 1] This is a schematic side view showing a slewing work machine. [Figure 2]This is a schematic plan view showing a slewing work machine. [Figure 3] This is a schematic rear view showing a slewing work machine. [Figure 4] This is a left-front perspective view showing the turntable. [Figure 5] This is a right rear perspective view showing the turntable. [Figure 6] This is a plan view showing the lower travel body, the rotating base plate, and various equipment arranged on the rotating base plate. [Figure 7] This is a right-front perspective view showing the rotating base plate, battery unit, electric motor, hydraulic pump, and electrical components. [Figure 8] This is a left-front perspective view showing the support structure. [Figure 9] This is a plan view showing the support structure. [Figure 10] This is a bottom view showing the support structure. [Figure 11] This is a diagram illustrating the movement of the fixing device. [Figure 12] This is a left rear perspective view showing the support, the first erection section, and the second erection section, etc. [Figure 13] This is an exploded perspective view of the connecting bracket and electrical components, seen from the front left. [Figure 14] This is a plan view showing the electric motor, support unit, and hydraulic pump. [Figure 15] This is an exploded perspective view of the electric motor, connector, and first bracket, viewed from the front left. [Figure 16] This is an exploded perspective view of the hydraulic pump and second bracket, seen from the right rear. [Figure 17] This is a right-front perspective view showing the support structure. [Figure 18] This is an exploded perspective view showing the attachment of the first bracket and other components to the support parts. [Figure 19] This is an exploded perspective view showing the attachment of the second bracket and other support parts. [Figure 20] This is a rear view of the support part showing the position of the first knock pin. [Figure 21] This is a front view of the support section showing the position of the second knock pin. [Figure 22]It is a right rear perspective view showing the mounting of the third assembly. [Figure 23] It is an exploded perspective view of the electric motor, the connector, and the first bracket in the modified example, as viewed from the left front. [Figure 24] It is an exploded perspective view of the hydraulic pump and the second bracket in the modified example, as viewed from the right rear. [Figure 25] It is a right rear perspective view showing the mounting of the first assembly and the second assembly to the support portion in the modified example. [Mode for Carrying Out the Invention]

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Figure 1 is a schematic side view showing the swing working machine 1. Figure 2 is a schematic plan view showing the swing working machine 1. Figure 3 is a schematic rear view showing the swing working machine 1. First, the overall configuration of the swing working machine 1 will be described. As shown in Figure 1, the swing working machine 1 is, for example, a backhoe or the like provided with a swing table (machine body) 2, a lower traveling body 10, and a working device 20. The swing working machine 1 is an electric working machine driven by electric power. A driver's seat 8 on which a driver sits is provided on the swing table 2, and the periphery of the driver's seat 8 is covered by a protection mechanism 85.

[0009] In the present embodiment, the direction that the driver seated in the driver's seat 8 of the swing working machine 1 faces (the direction of arrow A1 in Figure 1, Figure 2, etc.) is referred to as the front, and the opposite direction (the direction of arrow A2 in Figure 1, Figure 2, etc.) is referred to as the rear. The left side of the driver (the near side in Figure 1, the direction of arrow B1 in Figure 2, Figure 3, etc.) is referred to as the left, and the right side of the driver (the far side in Figure 1, the direction of arrow B2 in Figure 2, Figure 3, etc.) is referred to as the right. The horizontal direction orthogonal to the front-rear direction is referred to as the width direction (see Figure 2 and Figure 3), and the direction extending from the center portion in the width direction of the swing table 2 toward the right portion or the left portion is referred to as the width direction outer side.

[0010] As shown in Figures 1 and 3, the turntable 2 is rotatable around a vertical axis (swing axis) X that extends in the vertical direction. Specifically, the turntable 2 is supported on the lower traveling body 10 via a slewing bearing 3 so that it can rotate around the slewing axis X (rotate to the left and right). The center of the slewing bearing 3 is the slewing axis X (center of rotation), and a slewing motor (not shown) is attached to the turntable 2. This slewing motor is a hydraulic device M driven by hydraulic fluid discharged by a hydraulic pump 92, and is a motor that rotates the turntable 2 around the slewing axis X. The turntable 2 is provided with an exterior cover (cover) 80, brackets, and stays. The exterior cover 80 forms a space (rear room) R at the rear of the turntable 2 for arranging equipment, tanks, and other parts. The brackets and stays are members for attaching the above-mentioned parts.

[0011] As shown in Figures 1 and 3, the lower traveling body 10 has a traveling frame 11 and a traveling mechanism 12. The traveling frame (track frame) 11 is a structure to which the traveling mechanism 12 is attached and which supports the turntable 2 on its upper part. The travel mechanism 12 is, for example, a crawler type. The travel mechanism 12 includes an idler 13, a drive wheel 14, a plurality of rolling wheels 15, an endless crawler belt 16, and hydraulic equipment M (travel motors ML, MR) of the travel system driven by hydraulic fluid discharged by a hydraulic pump 92. The travel motors ML, MR are composed of hydraulic motors and drive the drive wheel 14 to cause the crawler belt 16 to circumferentially move. As shown in Figure 3, a dozer device 18 is mounted on the front of the lower travel body 10, which is driven up and down by the extension and retraction of a dozer cylinder C5(M), which is a hydraulic cylinder (hydraulic actuator).

[0012] As shown in Figures 1 and 2, the work device 20 is provided on the front side of the turntable 2. The work device 20 has a boom 21, an arm 22, and a bucket (working tool) 23. The base end of the boom 21 is pivotally attached to the swing bracket 24 so as to be rotatable around a horizontal axis (axis extending in the width direction), allowing the boom 21 to swing up and down (vertically). The arm 22 is pivotally attached to the tip of the boom 21 so as to be rotatable around a horizontal axis, allowing the arm 22 to swing in the front-rear direction or up and down direction. The bucket 23 is provided at the tip of the arm 22 so as to be able to perform scooping and dumping operations. The turntable 1 can be fitted with other working tools (hydraulic attachments) that can be driven by hydraulic fluid in place of or in addition to the bucket 23. Examples of other working tools include hydraulic breakers, hydraulic crushers, angle brooms, earth augers, pallet forks, sweepers, mowers, snow blowers, etc.

[0013] As shown in Figure 1, the slewing work machine 1 is equipped with hydraulic equipment M of a work system that is operated by hydraulic fluid discharged by a hydraulic pump 92, and the work device 20 is driven by the operation of the hydraulic equipment M of the work system. In this embodiment, the hydraulic equipment M includes a swing cylinder C1, a boom cylinder C2, an arm cylinder C3, and a bucket cylinder C4. The swing cylinder C1, boom cylinder C2, arm cylinder C3, and bucket cylinder C4 are composed of hydraulic cylinders (hydraulic actuators). As shown in Figure 1, the swing bracket 24 is swingable by the extension and retraction of the swing cylinder C1, which is provided on the right side of the slewing platform 2. The boom 21 is swingable by the extension and retraction of the boom cylinder C2. The arm 22 is swingable by the extension and retraction of the arm cylinder C3. The bucket 23 is capable of scooping and dumping operations by the extension and retraction of the bucket cylinder C4.

[0014] Therefore, the hydraulic equipment M provided by the slewing work machine 1 includes a slewing motor, travel motors ML and MR, a swing cylinder C1, a boom cylinder C2, an arm cylinder C3, a bucket cylinder C4, and a dozer cylinder C5. The following describes the turntable 2. Figure 4 is a left front perspective view showing the turntable 2. Figure 5 is a right rear perspective view showing the turntable 2. As shown in Figures 4 and 5, the turntable 2 has a slewing base plate (base plate) 30, a plurality of longitudinal ribs 31 (first longitudinal rib 31a, second longitudinal rib 31b, third longitudinal rib 31c), a support bracket 32, a partition plate 33, a transverse rib 34, and a support frame 35. The slewing base plate 30 is formed from a thick steel plate or the like, and is arranged so that its surface faces up and down. The slewing base plate 30 is supported on the lower traveling body 10 via a slewing bearing 3 so as to be rotatable around the slewing axis X.

[0015] The first longitudinal rib 31a, the second longitudinal rib 31b, and the third longitudinal rib 31c are reinforcing members of the swivel base plate 30 and are provided extending in the front-rear direction of the swivel base plate 30. The first longitudinal rib 31a and the second longitudinal rib 31b are erected on the swivel base plate 30 and are arranged side by side, separated in the width direction. The first longitudinal rib 31a is located on the left side of the swivel base plate 30, and the second longitudinal rib 31b is located on the right side of the swivel base plate 30. The third longitudinal rib 31c is located between the first longitudinal rib 31a and the second longitudinal rib 31b and is provided extending from the rear of the swivel base plate 30 to the partition plate 33.

[0016] The support bracket 32 ​​is provided on the front of the first longitudinal rib 31a and the second longitudinal rib 31b. As shown in Figure 4, the support bracket 32 ​​and the front of the first longitudinal rib 31a and the second longitudinal rib 31b are positioned offset to the right from the center in the width direction of the pivoting base plate 30. As shown in Figure 1, a swing bracket 24 is attached to the support bracket 32 ​​so as to be able to swing around the vertical axis (the axis extending in the vertical direction).

[0017] As shown in Figures 4 and 5, the partition plate 33 is a component that partitions the lower front part of the rear room R. The partition plate 33 has its surface facing in the front-rear direction and is positioned in the center of the pivot base plate 30, extending from one side (left) to the other side (right) in the width direction. The transverse rib 34 is a member that reinforces the pivot base plate 30 and is arranged at the rear end of the pivot base plate 30 from one side (left side) to the other side (right side) in the width direction. The transverse rib 34 is erected on the pivot base plate 30 and is connected to the rear end of the first longitudinal rib 31a, the rear end of the second longitudinal rib 31b, and the rear end of the third longitudinal rib 31c.

[0018] The support frame 35 is located at the rear of the swivel base plate 30 and is erected behind the partition plate 33. The rear of the support frame 35 is located behind the rear of the lower traveling body 10. Specifically, the support frame 35 is located in the rear room R and supports the exterior cover 80 and peripheral components located inside the exterior cover 80. The support frame 35 has a plurality of leg members (first leg 35a, second leg 35b, third leg 35c, fourth leg 35d, fifth leg 35e), a first rod member 35h, and a second rod member 35i erected on the swivel base plate 30.

[0019] The first leg 35a is erected on the front left side of the rear room R. The first leg 35a is erected on the front of the first base 40a, which is located on the rear left side of the first longitudinal rib 31a. The first base 40a extends from the partition plate 33 to the transverse rib 34. The lower end of the first leg 35a extends upward from the first base 40a, extends rearward and upward in the middle section, and bends at the upper end to extend rearward.

[0020] The second leg 35b is erected on the front right side of the rear room R. The second leg 35b is erected on the second base 40b which is attached to the rear right side of the partition plate 33. In other words, the lower end of the second leg 35b is located in front of the lower end of the first leg 35a. The lower end of the second leg 35b extends upward from the second base 40b, extends rearward and upward in the middle section, and then bends at the upper end and extends rearward.

[0021] The third leg 35c is erected on the rear left side of the rear room R. The third leg 35c is erected in the center of the first base 40a. The lower end of the third leg 35c extends upward from the first base 40a and reaches the upper end of the first leg 35a. The fourth leg 35d is erected at the rear of the rear room R. The fourth leg 35d is positioned slightly to the left of the rear of the rear room R and is positioned further inward (to the right) in the width direction than the third leg 35c. The fourth leg 35d is erected on the third base 40c provided on the left side of the transverse rib 34. The lower end of the fourth leg 35d extends upward from the third base 40c, extends forward and upward at the middle section, and bends at the upper end to extend forward.

[0022] The fifth leg 35e is erected at the rear of the rear room R. The fifth leg 35e is positioned slightly to the right of the rear of the rear room R. The fifth leg 35e is erected on the fourth base 40d, which is located on the right side of the transverse rib 34. The lower end of the fifth leg 35e extends upward from the fourth base 40d, extends forward and upward in the middle section, and then bends at the upper end and extends forward. As shown in Figures 4 and 5, the upper ends of the fourth leg 35d and the fifth leg 35e are connected by a connecting plate 35f that extends in the width direction. The connecting plate 35f is also provided with a pair of support columns 35g that extend forward from the front end of the connecting plate 35f. The pair of support columns 35g are spaced apart in the width direction and are positioned corresponding to the upper ends of the fourth leg 35d and the fifth leg 35e, respectively. The rear ends of the fourth leg 35d and the fifth leg 35e are located behind the rear end of the lower running body 10.

[0023] The first rod member 35h and the second rod member 35i are arranged with their plate surfaces facing vertically and extending in the width direction. The first rod member 35h is positioned in front of the second rod member 35i. The first rod member 35h and the second rod member 35i are placed on and fixed to the upper end of the first leg 35a, the upper end of the second leg 35b, the upper end of the left support column 35g, and the upper end of the right support column 35g. The first rod member 35h supports the rear of the protective mechanism 85. The second rod member 35i supports the outer cover 80.

[0024] The following describes the equipment mounted in the rear room R of the slewing platform 2. Figure 6 is a plan view showing the lower traveling body 10, the slewing base plate 30, and various equipment arranged on the slewing base plate 30. Figure 7 is a right front perspective view showing the slewing base plate 30, battery unit 90, electric motor 91, hydraulic pump 92, and electrical equipment 93. As shown in Figures 6 and 7, the slewing work machine 1 comprises a battery unit 90, an electric motor 91, a hydraulic pump 92, and electrical equipment 93, and the battery unit 90, electric motor 91, hydraulic pump 92, and electrical equipment 93 are provided on the slewing platform 2. The battery unit 90 is a structure that can store electricity and output the stored electricity. In this embodiment, the battery unit 90 includes a plurality of batteries 90a. The plurality of batteries 90a are connected in parallel to each other. The plurality of batteries 90a are rechargeable batteries, such as lithium-ion batteries and lead-acid batteries. Each of the batteries 90a has a housing made of a flat steel plate and a plurality of cells arranged inside the housing, and the plurality of cells are electrically connected in series and / or parallel.

[0025] In this embodiment, the battery unit 90 has two batteries 90a. The number of batteries 90a in the battery unit 90 may be multiple, and is not limited to two; for example, it may be an even number other than two, or it may be three. The multiple batteries 90a are arranged adjacent to each other in the width direction and are connected by connecting brackets 90b.

[0026] The electric motor 91 is a drive source that rotates the drive shaft 91a using power output from the battery unit 90. The electric motor 91 is a permanent magnet embedded three-phase AC synchronous motor. The electric motor 91 has a rotatable rotor and a stator that generates the force to rotate the rotor. The electric motor 91 may be any other type of synchronous motor, and may be either an AC motor or a DC motor. The electric motor 91 rotates the drive shaft 91a and transmits the driving force from the drive shaft 91a to the hydraulic pump 92.

[0027] The hydraulic pump 92 has an input shaft 92a to which power is input from the drive shaft 91a, and is driven by the power input from the drive shaft 91a to the input shaft 92a to discharge hydraulic fluid. The input shaft 92a is connected to the drive shaft 91a of the electric motor 91 and is driven by the driving force transmitted from the drive shaft 91a. In this embodiment, the input shaft 92a is splined. The splines applied to the input shaft 92a are sometimes called male splines.

[0028] The electrical components 93 are connected directly or indirectly to the battery unit 90 and transmit power supplied by the battery unit 90, or are devices that operate using such power. Examples of electrical components 93 include a junction box 93a, an inverter 93b, and a DC / DC converter 93c. The junction box 93a is connected to other devices, including the battery unit 90 and the inverter 93b, and transmits power supplied from the battery unit 90 to the other devices.

[0029] The inverter 93b is installed in the power supply path from the battery unit 90 to the electric motor 91 and adjusts the power output to the electric motor 91. The inverter 93b is a device that drives the electric motor 91, converting DC power to three-phase AC power and supplying the three-phase AC power to the electric motor 91. The inverter 93b can arbitrarily change the current and voltage of the power supplied to the electric motor 91.

[0030] The DC / DC converter 93c converts the voltage of the input DC current to a different voltage. In this embodiment, the DC / DC converter 93c is a step-down converter that converts the input voltage to a lower voltage. The DC / DC converter 93c is installed, for example, in a slewing work machine 1 and supplies power to an on-board battery (not shown) that supplies power to electronic equipment. The arrangement of the battery unit 90, electric motor 91, hydraulic pump 92, and electrical components 93 will be described below. As shown in Figure 6, the battery unit 90 is located in the center of the width direction at the rear of the turntable 2. More specifically, the battery unit 90 is located from the middle of the turntable 2 in the front-rear direction to the rear of the turntable 2. In other words, the rear of the battery unit 90 is located behind the rear of the lower traveling body 10. Also, as shown in Figure 2, the center of gravity of the battery unit 90 is located on one side (left side) of the center line Y in the width direction of the turntable 2, and is located behind the protection mechanism 85.

[0031] As shown in Figure 6, the outer periphery of the battery unit 90 is surrounded by a support frame 35. Specifically, the lower ends of the first leg 35a and the second leg 35b are located in front of the battery unit 90. The third leg 35c is located to the left of the battery unit 90. The lower ends of the fourth leg 35d and the fifth leg 35e are located behind the battery unit 90. Above the battery unit 90 are the upper ends of the first leg 35a, the second leg 35b, the fourth leg 35d, the fifth leg 35e, a pair of support columns 35g, the first rod member 35h, and the second rod member 35i.

[0032] As shown in Figure 2, the electric motor 91 and hydraulic pump 92 are arranged side by side in the front-to-back direction to the other side (right side) of the center line Y in the width direction of the turntable 2, and to the side of the battery unit 90, as shown in Figures 6 and 7. Specifically, the electric motor 91 and hydraulic pump 92 are located below the side (right side) of the battery unit 90. More specifically, as shown in Figure 6, the electric motor 91 and hydraulic pump 92 are located to the right of the lower end of the second leg 35b. The electric motor 91 is located behind the hydraulic pump 92, and is positioned so that its drive shaft 91a faces in the front-to-back direction. The hydraulic pump 92 is positioned so that its input shaft 92a faces in the front-to-back direction, and the axis of the input shaft 92a coincides with the axis of the drive shaft 91a.

[0033] The hydraulic pump 92 is located in front of the electric motor 91. As shown in Figure 2, a hydraulic oil tank 94, which stores the hydraulic fluid that the hydraulic pump 92 draws in, is located in front of the hydraulic pump 92. A control valve 95 for adjusting the flow rate of hydraulic fluid supplied to the hydraulic equipment M is provided at the front of the hydraulic oil tank 94. As shown in Figures 3 and 7, the electrical components 93 are arranged in a line in the width direction above the battery unit 90. In other words, the battery unit 90 is located below the electrical components 93, and the turntable 2, battery unit 90, and electrical components 93 are arranged in the order of turntable 2, battery unit 90, and electrical components 93 from bottom to top. That is, the battery unit 90, which is relatively heavy, is located below the electrical components 93, resulting in a lower position on the turntable 1.

[0034] The following describes in detail the installation of the battery unit 90, electric motor 91, hydraulic pump 92, and electrical components 93. As shown in Figure 7, the slewing work machine 1 comprises a support body 50, an upright frame 56, and a support section 65. The support body 50 is a structure that supports the battery unit 90 on the slewing platform 2. Figure 8 is a left front perspective view showing the support body 50. Figure 9 is a plan view showing the support body 50. Figure 10 is a bottom view showing the support body 50.

[0035] As shown in Figures 8, 9, and 10, the support 50 is made of a thick steel plate or the like. The support 50 is positioned on the turntable 2 with its plate surface facing vertically. The support 50 is fixed to the turntable 2 via fasteners V such as bolts. In other words, the support 50 is attached to the turntable 2 in such a way that its relative position to the turntable 2 cannot be moved. Furthermore, the support 50 includes a frame member 51 and a plurality of plate members 52. The frame member 51 is a member that connects the plurality of plate members 52. The frame member 51 connects the plurality of plate members 52 such that their upper surfaces are flush.

[0036] The frame member 51 includes a front frame 51a, a rear frame 51b, and a pair of side frames 51c and 51d. The front frame 51a, the rear frame 51b, and the pair of side frames 51c and 51d are long frames with a roughly L-shaped cross-section formed by bending thick steel plates. The front frame 51a forms the front end of the frame member 51 and is positioned so that its longitudinal direction coincides with the width direction.

[0037] The rear frame 51b forms the rear end of the frame member 51 and is positioned so that its longitudinal direction coincides with the width direction. The rear frame 51b is positioned spaced apart from the front frame 51a in the front-rear direction. The pair of side frames 51c and 51d are spaced apart in the width direction. The pair of side frames 51c and 51d each form one end (left end) and the other end (right end) of the frame member 51 in the width direction, and are arranged so that their longitudinal direction coincides with the front-to-back direction. In other words, the frame member 51, consisting of the front frame 51a, the pair of side frames 51c and 51d, and the rear frame 51b, forms a roughly grid shape in plan view. For this reason, an opening 51E is formed in the center of the frame member 51. The front frame 51a, the pair of side frames 51c and 51d, and the rear frame 51b may each be connected by multiple plate members 52, and may be directly connected to each other by welding or other means, or indirectly connected via multiple plate members 52.

[0038] Furthermore, the frame member 51 includes a pair of mounting brackets 51e. The pair of mounting brackets 51e are provided on one end (left side) and the other end (right side) of the frame member 51 in the width direction. In this embodiment, the pair of mounting brackets 51e are provided at the rear end of the frame member 51. The left mounting bracket 51e connects the rear end of the left side frame 51c to the rear of the rear frame 51b and extends upward. The right mounting bracket 51e connects the rear end of the right side frame 51d to the rear of the rear frame 51b and extends upward. The pair of mounting brackets 51e are attached and fixed to the lower rear of the battery unit 90 by fasteners such as bolts.

[0039] The frame member 51 is fixed to the lower surface and / or side surface of the plate member 52 by welding. The plate member 52 is a long, plate-shaped member on which the outer periphery of the bottom of the battery unit 90 rests. The mounting surface of the plate member 52 on which the battery unit 90 rests (the hatched area in Figure 8) is machined to be smooth. In other words, the part of the support 50 other than the mounting surface of the plate member 52 is not machined. The plate member 52 is machined while it is fixed to the frame member 51. This allows for the removal of distortion (welding distortion) that occurs on the mounting surface of the plate member 52 due to welding. In this embodiment, since the battery unit 90 is placed on the upper surface of the plate member 52, the mounting surface is the upper surface of the plate member 52.

[0040] Furthermore, the multiple plate members 52 are fixed to the frame member 51 at intervals from each other. The lower surface and / or side surface of the plate members 52 are fixed to the frame member 51 by welding. In this embodiment, the multiple plate members 52 consist of four plate members 52, including a first plate portion 52a, a second plate portion 52b, a third plate portion 52c, and a fourth plate portion 52d. Note that the number of multiple plate members 52 is not limited to four; it may be three or five.

[0041] The first plate portion 52a is on which the front end of the battery unit 90 is placed. In this embodiment, the first plate portion 52a is on which the front ends of multiple batteries 90a are placed. The first plate portion 52a is positioned at the front end of the support 50 and is positioned so that its longitudinal direction and width direction coincide. The first plate portion 52a is connected to the third plate portion 52c and the fourth plate portion 52d via the front frame 51a.

[0042] The lower surface and / or side surface of the first plate portion 52a is fixed to the front frame 51a and the pair of side frames 51c, 51d by welding. In this embodiment, the first plate portion 52a is fixed to the front frame 51a and the pair of side frames 51c, 51d by welding on both its lower surface and side surface. Furthermore, the front portion of the first plate portion 52a has holes 52a1 that penetrate vertically and notches 52a2 that are cut out from the front end toward the rear. Multiple holes 52a1 are formed across the width of the first plate portion 52a from one side (left) to the other side (right). Multiple notches 52a2 are formed across the width of the first plate portion 52a from one side (left) to the other side (right). Also, the notches 52a2 are formed between the holes 52a1. Therefore, the first plate portion 52a is formed in a roughly comb-like shape when viewed from above.

[0043] The rear end of the battery unit 90 is placed on the second plate portion 52b. In this embodiment, the rear ends of multiple batteries 90a are placed on the second plate portion 52b. The second plate portion 52b is positioned at the rear end of the support 50 and is positioned so that its longitudinal direction and width direction coincide. The second plate portion 52b is connected to the third plate portion 52c and the fourth plate portion 52d via the rear frame 51b.

[0044] The lower surface and / or side surface of the second plate portion 52b is fixed to the rear frame 51b and the pair of side frames 51c, 51d by welding. In this embodiment, the second plate portion 52b is fixed to the rear frame 51b and the pair of side frames 51c, 51d by welding on both its lower surface and side surface. The third plate portion 52c is on which one end (left end) of the battery unit 90 in the width direction is placed. The third plate portion 52c is on which the left end of one end (left end) of the battery 90a in the width direction is placed. The third plate portion 52c is positioned at the left end of the support 50 and is positioned so that its longitudinal direction and front-to-back direction coincide. The third plate portion 52c is connected to the first plate portion 52a and the second plate portion 52b via a pair of side frames 51c and 51d.

[0045] The lower surface and / or side surface of the third plate portion 52c is fixed to the front frame 51a and the left side frame 51c, 51d by welding. In this embodiment, the third plate portion 52c is fixed to the front frame 51a and the left side frame 51c, 51d by welding on both its lower surface and side surface. Furthermore, the third plate portion 52c has a first mounting portion 52c1 which is fixed to the turntable 2 via fasteners V such as bolts. The first mounting portion 52c1 is a portion that extends outward (to the left) in the width direction and has a hole 52c2 that penetrates through it in the vertical direction. The fasteners V are inserted through the hole 52c2 and fastened to the first base portion 40a. In this embodiment, the first mounting portion 52c1 is formed in the portion near the front end and the portion near the rear end of the third plate portion 52c.

[0046] The fourth plate portion 52d is on which the other end (right end) in the width direction of the battery unit 90 is placed. The fourth plate portion 52d is on which the right end of the battery 90a at the other end (right end) in the width direction of the plurality of batteries 90a is placed. The fourth plate portion 52d is positioned at the right end of the support 50 and is positioned so that its longitudinal direction and front-to-back direction coincide. The fourth plate portion 52d is connected to the first plate portion 52a and the second plate portion 52b via a pair of side frames 51c, 51d.

[0047] The lower surface and / or side surface of the fourth plate portion 52d is fixed to the front frame 51a and the right side frame 51c, 51d by welding. In this embodiment, the fourth plate portion 52d is fixed to the front frame 51a and the right side frame 51c, 51d by welding on both its lower surface and side surface. Furthermore, the fourth plate portion 52d has a second mounting portion 52d1 which is fixed to the turntable 2 via fasteners V such as bolts. The second mounting portion 52d1 is a portion that extends outward (to the right) in the width direction and has a hole 52d2 that penetrates vertically. Fasteners V are inserted through the hole 52d2 and fastened to the fifth base portion 40e provided on the rear right side of the second longitudinal rib 31b, and to the sixth base portion 40f attached to the right end of the transverse rib 34. In this embodiment, the second mounting portion 52d1 is formed at the front end and rear end of the fourth plate portion 52d. That is, the front second mounting portion 52d1 is formed in front of the front first mounting portion 52c1, and the rear second mounting portion 52d1 is formed behind the rear first mounting portion 52c1.

[0048] As shown in Figures 8, 9, and 10, the support 50 includes a first connecting plate 53 and a second connecting plate 54. The first connecting plate 53 is a long frame that connects the widthwise central portion of the first plate portion 52a and the widthwise central portion of the second plate portion 52b. The first connecting plate 53 is formed from a thick steel plate that is thinner than the multiple plate members 52, and the rear end of the first connecting plate 53 is connected to the lower surface of the widthwise central portion of the second plate portion 52b. The rear end of the first connecting plate 53 extends forward from the second plate portion 52b, bends upward, and bends forward again, reaching the first plate portion 52a so that its upper surface is flush with the multiple plate members 52. The lower surface and side surface of the front end of the first connecting plate 53 are fixed to the rear end of the first plate portion 52a by welding. In addition, two adjacent batteries 90a of the multiple batteries 90a are placed on the first connecting plate 53.

[0049] As shown in Figures 8, 9, and 10, the first connecting plate 53 has ventilation holes 53a formed between the two batteries 90a. The ventilation holes 53a are holes that penetrate in the vertical direction. The width W1 of the ventilation holes 53a is larger than the length W2 between the batteries 90a. Note that the ventilation holes 53a only need to overlap between the batteries 90a, and their shape, size, and number are not limited to the examples shown in Figure 9, etc. For example, the ventilation holes 53a may be formed in the shape of a circle, a slit, or a fin.

[0050] As shown in Figures 8, 9, and 10, the second connecting plate 54 is a long frame that passes through the center of the opening 51E formed in the central part of the frame member 51 and extends from one end (left end) to the other end (right end) in the width direction of the frame member 51. The left end of the second connecting plate 54 is connected to the center of the third plate portion 52c in the front-rear direction, and the right end of the second connecting plate 54 is connected to the center of the fourth plate portion 52d in the front-rear direction. For this reason, the first connecting plate 53 and the second connecting plate 54 are perpendicular to each other.

[0051] The first connecting plate 53 and the second connecting plate 54 are not machined, while the plate member 52 is machined while fixed to the frame member 51, before the first connecting plate 53 and the second connecting plate 54 are attached. Furthermore, as shown in Figure 8, the support 50 has a fastener 55. The fastener 55 is a bracket provided on the first plate portion 52a or the second plate portion 52b and for fixing the battery unit 90. The fastener 55, together with a pair of mounting brackets 51e, fixes the battery unit 90. In this embodiment, the fastener 55 is provided on the first plate portion 52a. The fastener 55 is mounted so as to be adjustable in the front-rear direction.

[0052] Figure 11 illustrates the movement of the fastener 55. As shown in Figure 11, the fastener 55 is attached to the first plate portion 52a by fasteners such as bolts and nuts, and these fasteners are fastened to holes 52a1 formed in the front part of the first plate portion 52a. Specifically, the fastener 55 is a member with a substantially L-shaped cross-section, having a first fixing part 55a and a second fixing part 55b extending upward from the first fixing part 55a. The first fixing part 55a has a through hole 55a1 that penetrates in the vertical direction and is elongated in the front-to-back direction. Therefore, as shown in Figure 11, the mounting position of the fastener 55 can be adjusted in the front-to-back direction by changing the position in which the fastener is inserted into the through hole 55a1. The second fixing part 55b has a through hole 55b1 that penetrates in the front-to-back direction and is elongated in the width direction. The second fixing part 55b is attached and fixed to the lower rear side of the battery unit 90 by fasteners such as bolts. Furthermore, if a pair of mounting brackets 51e are provided at the front end of the frame member 51, the fastener 55 will be attached to the second plate portion 52b.

[0053] The installation of the electrical components 93 will be described in detail below. As shown in Figure 7, the erected frame 56 has a first erected section 56L, a second erected section 56R, and a connecting stay 56U. Figure 12 is a left rear perspective view showing the support 50, the first erected section 56L, and the second erected section 56R, etc. As shown in Figure 12, the first upright portion 56L is erected on the upper part of the third plate portion 52c and supports one side of the battery unit 90, as shown in Figure 7. The first upright portion 56L is a plate-shaped member made of a thick steel plate or the like. Therefore, the first upright portion 56L supports the battery unit 90 in the front-to-back direction on one side (left side) in the width direction of the battery unit 90.

[0054] On the other hand, as shown in Figure 12, the second upright portion 56R is erected on the upper part of the fourth plate portion 52d and supports the other side (right side) of the battery unit 90, as shown in Figure 7. The second upright portion 56R is a plate-shaped member made of a thick steel plate or the like. Therefore, the second upright portion 56R supports the battery unit 90 in the front-rear direction on the other side (right side) in the width direction of the battery unit 90. In other words, the battery unit 90 is sandwiched between the first upright portion 56L and the second upright portion 56R in the width direction.

[0055] As shown in Figure 12, the first upright section 56L and the second upright section 56R each have a lower upright section (anti-sway section) 57 and an upper upright section 58, respectively. The lower upright section 57 is attached to the battery unit 90 in the front-rear direction. The lower upright sections 57 are provided on the left and right sides of the support 50, respectively. The lower upright section 57 of the second upright section 56R is erected between the support section 65 and the battery unit 90 and is attached to the other side (right side) of the battery unit 90.

[0056] Furthermore, the lower erected portion 57 of the first erected portion 56L is erected on the upper part of the support 50 (turntable 2) on one side (left side) of the battery unit 90, and is attached to one side (left side) of the battery unit 90 separately from the lower erected portion 57 of the second erected portion 56R. In this embodiment, the lower erected portion 57 and the battery unit 90 are attached and fixed together by fasteners such as bolts. The lower erected portion 57 has multiple openings 57a formed in it, spaced apart in the front-rear direction.

[0057] As shown in Figure 12, the upper upright portion 58 is the part attached to the upper part of the lower upright portion 57. The length of the upper upright portion 58 decreases in the front-to-back direction as it moves from bottom to top; that is, the rear end of the upper upright portion 58 forms an inclined portion 58a that moves from rear-down to front-up. The front end of the upper upright portion 58 forms an inclined portion 58b that moves from front-down to rear-up.

[0058] Furthermore, the upper upright portion 58 has multiple openings 58c formed at intervals in the front-rear direction. Also, the upper upright portion 58 is spaced apart from the battery unit 90, and a space is formed between the upper upright portion 58 and the battery unit 90. Furthermore, mounting portions 59 are formed at the front and rear ends of the upper upright portion 58, respectively, to which eye bolts 59A can be attached and detached. This allows the entire assembly to be lifted when mounting the unit, in which the battery unit 90 is placed on the support 50 and the electrical components 93 are attached to the connecting stay 56U, onto the turntable 2.

[0059] As shown in Figure 7, the connecting stay 56U connects the upper part of the first upright section 56L and the upper part of the second upright section 56R, and is a stay that supports the electrical components 93. In other words, the connecting stay 56U serves both to reinforce the first upright section 56L and the second upright section 56R and to support the electrical components 93. Specifically, the connecting stay 56U is formed from, for example, a thick steel plate, and is arranged so that the plate surface faces up and down. The connecting stay 56U is longer in the width direction than in the front-to-back direction, and its front-to-back length is shorter than the front-to-back length of the battery unit 90.

[0060] As shown in Figure 7, electrical components 93 are mounted on the upper part of the connecting stay 56U in a row in the width direction. The electrical components 93 are arranged on the upper part of the connecting stay 56U from one side in the width direction (left side) in the order of inverter 93b, junction box 93a, and DC / DC converter 93c. Figure 13 is an exploded perspective view of the connecting stay 56U and the electrical component 93 viewed from the left front. As shown in Figure 13, the electrical component 93 and the connecting stay 56U are attached and fixed together with fasteners V such as bolts. The electrical component 93 may also be attached and fixed to the connecting stay 56U via mounting stays 56U1 and 56U2. In this embodiment, the junction box 93a and the DC / DC converter 93c are attached and fixed to the connecting stay 56U via mounting stays 56U1 and 56U2. The mounting stays 56U1 and 56U2 have holes formed in them for attaching and fixing the electrical component 93 and the connecting stay 56U with fasteners V such as bolts. Of the holes formed in the mounting stay 56U2 for attaching the junction box 93a, the hole for attaching and fixing the connecting stay 56U with fasteners V is formed as an elongated hole in the width direction. This makes it possible to suppress the load placed on the harness connected to the electrical component 93 due to variations in the dimensional tolerances of the electrical component 93 and the connecting stay 56U.

[0061] The mounting of the electric motor 91 and hydraulic pump 92 will be described in detail below. Figure 14 is a plan view showing the electric motor 91, support section 65, and hydraulic pump 92. As shown in Figure 14, the slewing work machine 1 includes a connector 60, a first bracket 61, a second bracket 62, and a support section 65. The electric motor 91 and hydraulic pump 92 are connected by the connector 60, with the drive shaft 91a and input shaft 92a connected, and are integrally mounted to the support section 65 via the first bracket 61 and the second bracket 62. The structure in which the connector 60 and the first bracket 61 are attached to the electric motor 91 is mounted to the support section 65 via the first bracket 61. Similarly, the structure in which the second bracket 62 is attached to the hydraulic pump 92 is mounted to the support section 65 via the second bracket 62.

[0062] Figure 15 is an exploded perspective view of the electric motor 91, connector 60, and first bracket 61 viewed from the front left. The connector 60 is a coupling that connects the drive shaft 91a and the input shaft 92a. The coupling is provided across the drive shaft 91a and the input shaft 92a and connects the drive shaft 91a and the input shaft 92a so that they can rotate together around the same axis. As shown in Figure 15, the connector 60 is, for example, a substantially cylindrical member extending in the axial direction of the drive shaft 91a and the input shaft 92a. The connector 60 has, for example, a first connecting portion (boss portion) 60a connected to the drive shaft 91a, a second connecting portion (flange portion) 60b connected to the input shaft 92a, and an elastic body 60c connecting the first connecting portion 60a and the second connecting portion 60b. The first connecting portion 60a is cylindrical in shape, and the drive shaft 91a can be inserted through it.

[0063] Furthermore, the first connecting portion 60a can be used to fix the inserted drive shaft 91a by means of a spring pin or set screw attached to the outer circumference of the first connecting portion 60a. The second connecting portion 60b has a female spline that engages with the male spline of the input shaft 92a. The elastic body 60c is made of an elastic material such as rubber and is connected to the first connecting portion 60a and the second connecting portion 60b by fastening members such as bolts.

[0064] As shown in Figure 14, the first bracket (bracket) 61 is separate from the electric motor 91 and connects the electric motor 91 to the support part 65. The first bracket 61 is attached to the support part 65 with the connector 60 already attached to the electric motor 91. As shown in Figure 15, the first bracket 61 is a plate-shaped member made of a thick steel plate or the like. In this embodiment, the first bracket 61 is formed in a substantially square shape when viewed from the front or rear, and a first mounting hole (mounting hole) 61a is formed in the center. The first mounting hole 61a is a hole through which the drive shaft 91a is inserted, and a first spigot fitting portion (spigot fitting portion) 91b2 formed around the drive shaft 91a in the housing 91b of the electric motor 91 is mounted. The first spigot fitting portion 91b2 is formed to protrude from the first flange portion 91b1 formed on the drive shaft 91a side of the housing 91b of the electric motor 91 toward the tip side of the drive shaft 91a. The inner diameter of the first mounting hole 61a is formed to be smaller than the outer diameter of the connector 60, and the first bracket 61 is attached to the electric motor 91 before the connector 60 is connected to the drive shaft 91a.

[0065] The first bracket 61 has a first connecting portion 61A that is connected to the electric motor 91 and a first extension portion (extension portion) 61B that is connected to the support portion 65. The first connecting portion 61A is the portion that is connected to the first flange portion 91b1 and has a hole 61A1 that penetrates in the axial direction of the drive shaft 91a and through which a fastener V1 such as a bolt is inserted. The first extension portion 61B extends radially outward from the drive shaft 91a beyond the first connecting portion 61A. In other words, the first extension portion 61B extends radially outward from the drive shaft 91a beyond the electric motor 91. The first extension portion 61B has a first connected portion (connected portion) 61B1 which is connected to the support portion 65. The first connected portion 61B1 is a hole that penetrates in the axial direction of the drive shaft 91a and through which a fastener V2 such as a bolt is inserted, and the first bracket 61 and the support portion 65 are connected by the fastener V2. In this embodiment, four first connected portions 61B1 are formed on the first extension portion 61B, and are formed at each vertex of the first extension portion 61B.

[0066] Therefore, the first bracket 61 is attached to the electric motor 91 after aligning the axis of the drive shaft 91a with the center of the first mounting hole 61a by engaging the first spigot fitting portion 91b2 with the first mounting hole 61a. As shown in Figure 14, the second bracket (bracket) 62 is separate from the hydraulic pump 92 and connects the hydraulic pump 92 to the support part 65. The second bracket 62 is attached to the support part 65 with the connector 60 already attached to the hydraulic pump 92.

[0067] Figure 16 is an exploded perspective view of the hydraulic pump 92 and the second bracket 62 viewed from the right rear. As shown in Figure 16, the second bracket 62 is a plate-shaped member made of a thick steel plate or the like. In this embodiment, the second bracket 62 is formed in a substantially annular shape when viewed from the front or rear, and a second mounting hole (mounting hole) 62a is formed in the center. The second mounting hole 62a is a hole through which the input shaft 92a is inserted, and a second spigot fitting portion (spigot fitting portion) 92b2 formed around the input shaft 92a in the housing 92b of the hydraulic pump 92 is fitted into it. The second spigot fitting portion 92b2 is formed to protrude from the second flange portion 92b1 formed on the input shaft 92a side of the housing 92b of the hydraulic pump 92, toward the tip side of the input shaft 92a. The second bracket 62 is attached to the hydraulic pump 92 before being attached to the support portion 65.

[0068] The second bracket 62 has a second connecting portion 62A connected to the hydraulic pump 92 and a second extension portion (extension portion) 62B connected to the support portion 65. The second connecting portion 62A is the portion connected to the second flange portion 92b1 and has a hole 62A1 formed therein that penetrates in the axial direction of the input shaft 92a and into which a fastener V3 such as a bolt is fastened. In this embodiment, two holes 62A1 are formed in the second connecting portion 62A, one on the upper side and one on the lower side with respect to the input shaft 92a.

[0069] The second extension portion 62B extends radially outward from the input shaft 92a beyond the second connecting portion 62A. In other words, the second extension portion 62B extends radially outward from the input shaft 92a beyond the hydraulic pump 92. The second extension portion 62B has a second connected portion (connected portion) 62B1 which is connected to the support portion 65. The second connected portion 62B1 is a hole that penetrates in the axial direction of the input shaft 92a and through which a fastener V4 such as a bolt is inserted, and the second bracket 62 and the support portion 65 are connected by the fastener V4. In this embodiment, three second connected portions 62B1 are formed on the second extension portion 62B, with two second connected portions 62B1 formed on the upper part of the second extension portion 62B and one second connected portion 62B1 formed on the lower part of the second extension portion 62B. The second connected portion 62B1 at the lower part of the second extension 62B is formed offset in the width direction with respect to the input shaft 92a. This allows the worker to easily access the fastener V4 when attaching it to the second connected portion 62B1 at the lower part of the second extension 62B.

[0070] Therefore, the second bracket 62 is attached to the hydraulic pump 92 after aligning the axis of the input shaft 92a with the center of the second mounting hole 62a by engaging the second spigot fitting portion 92b2 with the second mounting hole 62a. As shown in Figure 7, the support portion 65 is a base located to the side of the battery unit 90 that supports the electric motor 91 and the hydraulic pump 92 on the turntable 2. The support portion 65 is separate from the support body and supports the electric motor 91 and the hydraulic pump 92 on the turntable 2 at the rear of the turntable 2. Also, as shown in Figure 14, the support portion 65 also serves as a housing that surrounds the outer diameter of the connector 60 when the electric motor 91 is attached to the support portion 65 via the first bracket 61 and the hydraulic pump 92 is attached to the support portion 65 via the second bracket 62. The support portion 65 connects the electric motor 91 and the hydraulic pump 92 and supports the electric motor 91 and the hydraulic pump 92 side by side in the front-to-back direction.

[0071] Figure 17 is a right rear perspective view showing the support portion 65. Figure 18 is an exploded perspective view showing the attachment of the first bracket 61, etc., to the support portion 65. Figure 19 is an exploded perspective view showing the attachment of the second bracket 62, etc., to the support portion 65. As shown in Figures 17, 18, and 19, the support portion 65 has a first upright plate 66, a second upright plate 67, a curved portion 68, and a base portion 69. The first upright plate 66 is a plate-shaped member made of a thick steel plate or the like. The first upright plate 66 is erected so that its plate surface faces the axial direction (front-rear direction) of the drive shaft 91a and the input shaft 92a.

[0072] In this embodiment, the first upright plate 66 is formed in a substantially square shape when viewed from the front or rear, and corresponds to the first bracket 61. A first opening 66a for inserting the connector 60 is formed in the center of the first upright plate 66. That is, the inner diameter of the first opening 66a is formed to be larger than the outer diameter of the connector 60. In addition, a hole 66b is formed in the edge of the first upright plate 66, through which a fastener V2 such as a bolt inserted into the first connected portion 61B1 is fastened.

[0073] Furthermore, the edge of the first upright plate 66 is provided with a notch 66c and a hole 66d to avoid interference between the electric motor 91 and the fastener V1 connecting the first bracket 61. The second upright plate 67 is a plate-shaped member made of thick steel plate or the like. The second upright plate 67 is erected so that its plate surface faces the axial direction (front-rear direction) of the drive shaft 91a and the input shaft 92a. The second upright plate 67 is also spaced apart in the axial direction (front-rear direction) of the drive shaft 91a and the input shaft 92a and is positioned opposite the first upright plate 66. When viewed from the front or rear, the upper part of the second upright plate 67 is formed in a semi-circular shape, and the lower part is formed in a roughly rectangular shape, corresponding to the second bracket 62. A second opening 67a corresponding to the first opening 66a is formed in the center of the second upright plate 67. In addition, a hole 67b is formed in the edge of the second upright plate 67, through which a fastener V4 such as a bolt inserted into the second connected part 62B1 is fastened.

[0074] The curved portion 68 is positioned between the first upright plate 66 and the second upright plate 67 and is a member that connects the first upright plate 66 and the second upright plate 67. The curved portion 68 is a plate-shaped member made of a thick steel plate or the like, and in a front view or rear view, it forms an inverted U shape that is convex upwards. One end (left end) of the curved portion 68 extends upward from the upper surface of the base portion 69, the middle part of the curved portion 68 curves across the outer circumference of the connector 60, and the other end (right end) of the curved portion 68 reaches the upper surface of the base portion 69.

[0075] The base portion 69 is a plate-shaped member made of thick steel plate or the like, and is arranged so that its plate surface faces up and down. The base portion 69 supports the first upright plate 66, the second upright plate 67, and the curved portion 68 on the turntable 2. The base portion 69 has a central portion 69a on which the first upright plate 66, the second upright plate 67, and the curved portion 68 are provided, and a pair of extension portions 69b and 69c extending from the central portion 69a. The central portion 69a is a roughly rectangular shape that is long in the width direction, and its ends in the width direction extend outward in the width direction beyond the electric motor 91 and the hydraulic pump 92, respectively.

[0076] The pair of extensions 69b and 69c include a first extension 69b extending rearward from the rear end of the central portion 69a, and a second extension 69c extending forward from the front end of the central portion 69a. The first extension 69b is a member that constitutes the rear end of the base portion 69, and is formed in a substantially trapezoidal shape in plan view. The widthwise ends of the first extension 69b extend outward in the widthwise direction from the electric motor 91 and the hydraulic pump 92, respectively.

[0077] More specifically, the rear end of the first extension 69b has an inclined portion 69b1 that transitions from the front to the rear as it moves from the other side (right side) to the left side (left side) in the width direction. Therefore, the inclined portion 69b1 is formed in a shape that conforms to the outer shape of the right rear part of the outer cover 80. In addition, the first extension 69b has an opening 69b2 that penetrates in the vertical direction. The second extension 69c is a component that constitutes the front end of the base portion 69, and the widthwise ends of the second extension 69c extend outward in the widthwise direction from the electric motor 91 and the hydraulic pump 92, respectively. A notch 69c1 is formed at the front end of the second extension 69c. This notch 69c1 is a portion that avoids interference with protrusions such as ports provided on the hydraulic pump 92.

[0078] As shown in Figures 7 and 14, the support portion 65 is attached to the turntable 2 via a plurality of mounting devices 70. The plurality of mounting devices 70 are located in the width direction outward from the electric motor 91, the hydraulic pump 92, and the support portion 65 in a plan view, with the electric motor 91 and the hydraulic pump 92 attached to the support portion 65. The multiple mounting devices 70 are vibration isolation mechanisms composed of elastically deformable elastic members or the like. As shown in Figure 14, four of the multiple mounting devices 70 are provided. As shown in Figure 7, the multiple mounting devices 70 are attached to fixed brackets 41 and 42 attached to the turntable 2. Note that the number of multiple mounting devices 70 is not limited to four; there may be three or five. In this embodiment, the multiple mounting devices 70 include a pair of rear mounting devices 70a and a pair of front mounting devices 70b.

[0079] As shown in Figure 14, a pair of rear mounting devices 70a are arranged in the width direction at the rear end of the first extension 69b. The pair of rear mounting devices 70a support one side (left) and the other side (right) in the width direction of the rear end of the first extension 69b. For this reason, in a plan view, the pair of rear mounting devices 70a are located further outward in the width direction than the electric motor 91, the hydraulic pump 92, and the support portion 65. More specifically, the center of the nut N that fastens the pair of rear mounting devices 70a to the first extension 69b is located further outward in the width direction than the electric motor 91, the hydraulic pump 92, and the support portion 65. In addition, the pair of rear mounting devices 70a are arranged offset in the front-rear direction.

[0080] A pair of front mounting devices 70b are arranged in the width direction at the front end of the second extension 69c. The pair of front mounting devices 70b support one side (left) and the other side (right) in the width direction of the front end of the second extension 69c. For this reason, in a plan view, the pair of front mounting devices 70b are located further outward in the width direction than the electric motor 91, the hydraulic pump 92, and the support portion 65. More specifically, the centers of the nuts N that fasten the pair of front mounting devices 70b to the second extension 69c are located further outward in the width direction than the electric motor 91, the hydraulic pump 92, and the support portion 65. In addition, the pair of front mounting devices 70b are arranged so that their positions in the front-rear direction coincide.

[0081] Furthermore, as shown in Figures 18 and 19, the support portion 65 is provided with knock pins 66e and 67c that are fitted into the first bracket 61 and / or the second bracket 62. As shown in Figure 18, the first upright plate 66 is provided with knock pins (first knock pins) 66e that are oriented in the axial direction of the drive shaft 91a. Multiple first knock pins 66e are provided on the first upright plate 66, and in this embodiment, two are provided on the first upright plate 66.

[0082] Figure 20 is a rear view of the support portion 65 showing the position of the first knock pins 66e. As shown in Figure 20, the pair of first knock pins 66e are provided on the edge of the first upright plate 66, and are arranged such that the straight line L1 connecting their respective axes passes through the axis of the drive shaft 91a. In this embodiment, one of the first knock pins 66e is provided on the lower part of one side (left side) in the width direction of the first extension portion 61B, and the other first knock pin 66e is provided on the upper part of the other side (right side) in the width direction of the first extension portion 61B.

[0083] As shown in Figure 18, the first bracket 61 has a hole (first insertion hole) 61B2 into which the first knock pin 66e is inserted. The first insertion hole 61B2 is a hole that penetrates in the axial direction of the drive shaft 91a and is formed at a position corresponding to the pair of first knock pins 66e. As shown in Figure 19, the second upright plate 67 is provided with knock pins (second knock pins) 67c facing in the axial direction of the input shaft 92a. Multiple second knock pins 67c are provided on the second upright plate 67, and in this embodiment, two are provided on the second upright plate 67.

[0084] Figure 21 is a front view of the support portion 65 showing the position of the second knock pins 67c. As shown in Figure 21, the pair of second knock pins 67c are provided on the edge of the second upright plate 67, and are positioned such that the straight line L2 connecting their respective axes is offset with respect to the axis of the input shaft 92a. In this embodiment, one of the second knock pins 67c is provided on the upper part of the second extension portion 62B, towards the other side (right side) in the width direction, and the other second knock pin 67c is provided on the lower part of the second extension portion 62B, also towards the other side (right side) in the width direction. In other words, the pair of second knock pins 67c are provided to the right of the perpendicular line Z passing through the axis of the input shaft 92a.

[0085] As shown in Figure 19, the second bracket 62 has a hole (second insertion hole) 62B2 into which the second knock pin 67c is inserted. The second insertion hole 62B2 is a hole that penetrates in the axial direction of the input shaft 92a and is formed at a position corresponding to the pair of second knock pins 67c. Furthermore, mounting portions 71 for attaching the suspension device 75 are formed on at least two of the following: the electric motor 91, the first bracket 61, the support portion 65, the second bracket 62, and the hydraulic pump 92. In this embodiment, the mounting portions 71 are formed on the electric motor 91, the support portion 65, and the second bracket 62. As a result, by attaching the suspension device 75 to the mounting portions 71, a connected structure in which the electric motor 91 is connected to the support portion 65 by the first bracket 61 and the hydraulic pump 92 is connected to the support portion 65 by the second bracket 62 can be suspended. In this embodiment, the suspension device 75 is an eye bolt and is detachably attached to the mounting portion 71. Note that the fastening holes formed in the mounting portion 71 and into which the suspension device 75 is fastened are common, and the suspension device 75 can be shared.

[0086] The electric motor 91 has a pair of mounting portions 71. The pair of mounting portions 71 are formed on the upper part of one end (left end) and the upper part of the other end (right end) of the housing 91b of the electric motor 91 in the axial direction of the drive shaft 91a. The support portion 65 has a mounting portion 71 (second mounting portion 71B) for attaching the suspension device 75 (second suspension device 75B). The second mounting portion 71B is formed to connect the upper part of the first upright plate 66 and the upper part of the curved portion 68.

[0087] The second bracket 62 has a mounting portion 71 (first mounting portion 71A) for attaching the suspension device 75 (first suspension device 75A). The first mounting portion 71A is formed on the upper part of the second bracket 62. In the above-described embodiment, the case in which the mounting portion 71 is formed on the electric motor 91, the support portion 65, and the second bracket 62 was explained as an example. However, it is sufficient that the mounting portion 71 for attaching the suspension device 75 is formed on at least two or more of the electric motor 91, the first bracket 61, the support portion 65, the second bracket 62, and the hydraulic pump 92, and the mounting portion 71 may be formed on the first bracket 61 or the hydraulic pump 92.

[0088] The assembly of the electric motor 91, hydraulic pump 92, connector 60, first bracket 61, second bracket 62, and support part 65 will be described in detail. First, the assembly of the electric motor 91, connector 60, first bracket 61, and support part 65 will be described. As shown in Figure 15, the worker aligns the first mounting hole 61a and the first spigot fitting part 91b2 and attaches the first spigot fitting part 91b2 to the first mounting hole 61a. The worker inserts the fastener V1 through the hole 61A1 of the first connecting part 61A and attaches the first bracket 61 to the electric motor 91.

[0089] The worker attaches the connector 60 to the drive shaft 91a of the electric motor 91 to which the first bracket 61 is attached. Specifically, the first connecting portion 60a of the connector 60 into which the drive shaft 91a is inserted, and the drive shaft 91a is fixed by a spring pin. In the following description, the process of attaching the first bracket 61 and the connector 60 to the electric motor 91 described above may be referred to as the "first step" of the process of attaching the electric motor 91 to the support portion 65. Furthermore, the structure including the electric motor 91, the first bracket 61, and the connector 60 attached in the first step may be referred to as the "first assembly".

[0090] The worker attaches the lifting device 75 to a pair of mounting parts 71 of the electric motor 91. The worker then attaches the hook of a crane, which is stationed in the factory or other work area, to the lifting device 75 and lifts the first assembly. As shown in Figure 18, the worker inserts the connector 60 into the first opening 66a and aligns the first knock pin 66e with the first insertion hole 61B2. At this time, since the pair of first knock pins 66e are positioned such that the straight line L1 connecting their respective axes passes through the axis of the drive shaft 91a, the worker can easily align the first knock pin 66e with the first insertion hole 61B2 by swinging the first assembly around the drive shaft 91a. After inserting the first knock pin 66e into the first insertion hole 61B2, the worker inserts the fastener V2 through the first connected portion 61B1 and attaches the first bracket 61 to the support portion 65. In the following description, the step of attaching the first assembly to the support portion 65 described above may be referred to as the "second step" of the step of attaching the electric motor 91 to the support portion 65.

[0091] Next, the assembly of the hydraulic pump 92, connector 60, second bracket 62, and support part 65 will be described. As shown in Figure 16, the worker aligns the second mounting hole 62a with the second spigot inner fitting part 92b2 and attaches the second spigot inner fitting part 92b2 to the second mounting hole 62a. As shown in Figure 16, the worker fastens the fastener V3 to the hole 62A1 through the hole in the second flange part 92b1 and attaches the second bracket 62 to the hydraulic pump 92.

[0092] In the following explanation, the step of attaching the second bracket 62 described above to the hydraulic pump 92 may be referred to as the "first step" of the step of attaching the hydraulic pump 92 to the support part 65. Also, the structure including the hydraulic pump 92 and the second bracket 62 attached in the first step may be referred to as the "second assembly". The worker inserts the input shaft 92a into the second connection part 60b while aligning the second knock pin 67c with the second insertion hole 62B2. At this time, the pair of second knock pins 67c are positioned such that the straight line L2 connecting their respective axes is offset with respect to the axis of the input shaft 92a. Therefore, when the worker is working from one side (left side) in the width direction, the second knock pins 67c do not obstruct the worker's ability to confirm the positions of the input shaft 92a and the second connection part 60b, and the second knock pins 67c with the second insertion hole 62B2.

[0093] Furthermore, when attaching the second assembly to the support part 65, the worker may also attach the first lifting device 75A to the first mounting part 71A. The worker can then attach the crane hook to the first lifting device 75A and lift the second assembly. As shown in Figure 19, the worker inserts the fastener V4 through the second connected portion 62B1 and attaches the second bracket 62 to the support portion 65. In the following description, the step of attaching the above-described second assembly to the support portion 65 may be referred to as the "second step" of the step of attaching the hydraulic pump 92 to the support portion 65. Also, the structure including the electric motor 91, hydraulic pump 92, connector 60, first bracket 61, second bracket 62, and support portion 65 may be referred to as the "third assembly".

[0094] The worker then attaches the first lifting device 75A to the first mounting section 71A and the second lifting device 75B to the second mounting section 71B. The worker attaches the crane hook to the first lifting device 75A and the second lifting device 75B and can lift the third assembly. Figure 22 is a right rear perspective view showing the installation of the third assembly. The worker moves the third assembly to the fixed brackets 41 and 42 on the turntable 2 using the crane and aligns the multiple mounting devices 70 and the support section 65 as shown in Figure 22. The worker fastens the pair of rear mounting devices 70a to the first extension section 69b and the pair of front mounting devices 70b to the second extension section 69c using nuts N.

[0095] In the above-described embodiment, the support portion 65 has knock pins (first knock pin) 66e and knock pins (second knock pin) 67c, and the configuration for aligning the first bracket 61 and the second bracket 62 with respect to the support portion 65 was described as an example. However, instead of knock pins 66e and 67c, a configuration in which the first bracket 61 and the second bracket 62 are aligned with respect to the support portion 65 using another member may also be adopted.

[0096] Figure 23 is an exploded perspective view of the modified electric motor 91, connector 60, and first bracket 61 from the front left. Figure 24 is an exploded perspective view of the modified hydraulic pump 92 and second bracket 62 from the rear right. Figure 25 is a rear right perspective view showing the attachment of the first assembly and second assembly to the support part 65 in the modified example. As shown in Figure 23, the modified example of the first bracket 61 has a third spigot fitting portion (spigot fitting portion) 61C. The third spigot fitting portion 61C is formed to protrude from the first connecting portion 61A on the opposite side (front) of the electric motor 91 and towards the tip of the drive shaft 91a. The third spigot fitting portion 61C is an annular rib, and its outer diameter is approximately the same as the inner diameter of the first opening 66a. As shown in Figure 25, the third spigot fitting portion 61C is fitted into the first opening 66a. Furthermore, the inner diameter of the third spigot fitting portion 61C is larger than the outer diameter of the connector 60. For this reason, the third spigot fitting portion 61C may accommodate a part of the connector 60 inside. In such a case, the space between the connector 60 and the drive shaft 91a can be covered by the third spigot fitting portion 61C, thereby improving dust protection between the connector 60 and the drive shaft 91a.

[0097] Furthermore, in the modified example, the first bracket 61 differs from the first bracket 61 shown in Figure 15, etc., of the first connected portion 61B1 formed on the first extension portion 61B, the first connected portion 61B1 formed on the lower side is offset to be closer to the hole 61A1 formed in the center in the vertical direction than the hole 61A1 formed on the lower side. Furthermore, in the modified example, the first bracket 61 differs from the first bracket 61 shown in Figure 15, etc., in that one of the first connected portions 61B1 formed on the first extension portion 61B is formed offset outward in the width direction relative to the hole 61A1. In the example shown in Figures 23 and 25, of the first connected portions 61B1 formed on the first extension portion 61B, the lower and outward (rightward) first connected portion 61B1 in the width direction is formed offset outward (rightward) in the width direction relative to the hole 61A1.

[0098] Therefore, since the first connected portion 61B1 is located outward in the width direction relative to the electric motor 91, etc., the worker can easily access the fastener V2 when attaching it to the first connected portion 61B1. As shown in Figure 24, the modified example of the second bracket 62 has a fourth spigot fitting portion (spigot fitting portion) 62C. The fourth spigot fitting portion 62C is formed to protrude from the second connecting portion 62A on the opposite side (rear) of the hydraulic pump 92 and toward the tip side of the input shaft 92a. The fourth spigot fitting portion 62C is cylindrical in shape. The outer diameter of the fourth spigot fitting portion 62C is approximately the same as the inner diameter of the second opening 67a, and as shown in Figure 25, the fourth spigot fitting portion 62C is fitted into the second opening 67a.

[0099] The above-described slewing work machine 1 comprises a slewing platform 2, a battery unit 90, an electric motor 91 that rotates a drive shaft 91a using power output from the battery unit 90, an input shaft 92a to which power is input from the drive shaft 91a, and a hydraulic pump 92 that is driven by the power input from the drive shaft 91a to the input shaft 92a to discharge hydraulic fluid, a connector 60 that connects the drive shaft 91a and the input shaft 92a, a support section 65 that supports the electric motor 91 and the hydraulic pump 92 on the slewing platform 2, and a bracket (first bracket) 61 that is separate from the electric motor 91 and connects the electric motor 91 and the support section 65, wherein a structure (first assembly) to which the connector 60 and the first bracket 61 are attached to the electric motor 91 is attached to the support section 65 via the first bracket 61.

[0100] With the above configuration, the electric motor 91 can be easily attached to the support part 65 regardless of the shape of the electric motor 91 or the support part 65. Furthermore, by attaching the connector 60 to the electric motor 91 in advance, alignment with the drive shaft 91a can be easily performed. As a result, the power output from the drive shaft 91a to the input shaft 92a can be transmitted appropriately without loss. This reduces losses and extends the operating time of the electric motor 91.

[0101] Furthermore, the electric motor 91 has a spigot fitting portion (first spigot fitting portion) 91b2 formed around the drive shaft 91a, and the first bracket 61 has a mounting hole (first mounting hole) 61a into which the first spigot fitting portion 91b2 is mounted. With the above configuration, misalignment of the drive shaft 91a relative to the first bracket 61 can be suppressed, and the drive shaft 91a, the connector 60, and the input shaft 92a can be connected with high precision. As a result, power output from the drive shaft 91a to the input shaft 92a can be transmitted appropriately without loss.

[0102] Furthermore, the outer diameter of the connector 60 is larger than the inner diameter of the first mounting hole 61a. With the above configuration, a relatively large connector 60 can be used regardless of the inner diameter of the first mounting hole 61a, and power output from the drive shaft 91a to the input shaft 92a can be transmitted appropriately without loss. Furthermore, since the first bracket 61 is attached to the electric motor 91 together with the connector 60 in advance before being attached to the support part 65, alignment with the drive shaft 91a can be made easier compared to the case where the electric motor 91 is attached to the support part 65 first and then the connector 60 is attached.

[0103] Furthermore, with the electric motor 91 attached to the support portion 65 via the first bracket 61, the support portion 65 is a housing that surrounds the outer diameter of the connector 60. With the above configuration, the support portion 65 can support the electric motor 91 and cover the connector 60. This prevents the connector 60, which rotates on the drive shaft 91a, from coming into contact with the outside. Furthermore, since the first bracket 61 is attached to the electric motor 91 together with the connector 60 beforehand, it is easier to align the electric motor 91 with the drive shaft 91a compared to attaching the connector 60 after attaching the electric motor 91 to the support portion 65.

[0104] Furthermore, the first bracket 61 has an extended portion (first extended portion) 61B that extends radially outward from the drive shaft 91a beyond the electric motor 91, and the first extended portion 61B has a connected portion (first connected portion) 61B1 that is connected to the support portion 65. With the above configuration, regardless of the shape of the electric motor 91 or the shape of the support portion 65, it is possible to secure a region for connecting the first bracket 61 and the support portion 65. This makes it possible to easily attach the electric motor 91 to the support portion 65.

[0105] Furthermore, the first connected portion 61B1 is a hole through which the fastener V2 is inserted, and the first bracket 61 and the support portion 65 are connected by the fastener V2. With the above configuration, the first bracket 61 can be easily and reliably attached to the support portion 65. Furthermore, since the first extension portion 61B extends radially outward from the drive shaft 91a beyond the electric motor 91, a sufficient area for operating the tool used to attach the fastener V2 can be secured.

[0106] Furthermore, the support portion 65 is provided with a knock pin (first knock pin) 66e facing in the axial direction of the drive shaft 91a, and the first bracket 61 has a hole (first insertion hole) 61a into which the first knock pin 66e is inserted. According to the above configuration, misalignment of the drive shaft 91a with respect to the support portion 65 can be suppressed, and the drive shaft 91a, the connector 60, and the input shaft 92a can be connected with high precision. As a result, power output from the drive shaft 91a to the input shaft 92a can be transmitted appropriately without loss.

[0107] Furthermore, the first bracket 61 has a mounting portion 71 for attaching the suspension device 75. With the above configuration, when attaching the first bracket 61 and connector 60 to the support section 65 while they are attached to the electric motor 91, they can be lifted using the suspension device 75. Therefore, the first bracket 61, connector 60, and electric motor 91 can be easily attached to the support section 65.

[0108] Furthermore, a structure (second assembly) to which a connector 60 and a first bracket 61 are attached to an electric motor 91, and a hydraulic pump 92 is attached to a bracket (second bracket) 62 separate from the first bracket 61, is attached to the support part 65 via the second bracket 62. With the above configuration, the hydraulic pump 92 can be easily attached to the support part 65, regardless of the shape of the hydraulic pump 92 or the shape of the support part 65.

[0109] Furthermore, the assembly method for the slewing work machine 1 includes an electric motor 91 that rotates a drive shaft 91a, a hydraulic pump 92 having an input shaft 92a to which power is input from the drive shaft 91a and driven by the power input from the drive shaft 91a to the input shaft 92a, a connector 60 that connects the drive shaft 91a and the input shaft 92a, a support part 65 that supports the electric motor 91 and the hydraulic pump 92, and a first bracket 61 which is separate from the electric motor 91 and connects the electric motor 91 and the support part 65, and the assembly method for the slewing work machine 1 includes a first step of attaching the first bracket 61 and the connector 60 to the electric motor 91, and a second step of attaching the first bracket 61, the connector 60, and the electric motor 91 attached in the first step to the support part 65.

[0110] With the above configuration, the electric motor 91 can be easily attached to the support part 65 regardless of the shape of the electric motor 91 or the support part 65. In addition, by attaching the connector 60 to the electric motor 91 in advance, alignment with the drive shaft 91a can be easily performed. The above-described slewing work machine 1 comprises a slewing platform 2, a battery unit 90, an electric motor 91 that rotates a drive shaft 91a using power output from the battery unit 90, a hydraulic pump 92 that has an input shaft 92a to which power is input from the drive shaft 91a and is driven by the power input from the drive shaft 91a to the input shaft 92a to discharge hydraulic fluid, a support section 65 that supports the electric motor 91 and the hydraulic pump 92 on the slewing platform 2, and a bracket (second bracket) 62 that is separate from the hydraulic pump 92 and connects the hydraulic pump 92 and the support section 65, wherein a structure (second assembly) with the second bracket 62 attached to the hydraulic pump 92 is attached to the support section 65 via the second bracket 62.

[0111] With the above configuration, the hydraulic pump 92 can be easily attached to the support part 65, regardless of the shape of the hydraulic pump 92 or the shape of the support part 65. Furthermore, the second bracket 62 has an extended portion (second extended portion) 62B that extends radially outward from the input shaft 92a beyond the hydraulic pump 92, and the second extended portion 62B has a connected portion (second connected portion) 62B1 that is connected to the support portion 65.

[0112] With the above configuration, regardless of the shape of the hydraulic pump 92 or the support portion 65, it is possible to secure a region for connecting the second bracket 62 and the support portion 65. This makes it possible to easily attach the hydraulic pump 92 to the support portion 65. Furthermore, the second connected portion 62B1 is a hole through which the fastener V4 is inserted, and the second bracket 62 and the support portion 65 are connected by the fastener V4.

[0113] With the above configuration, the second bracket 62 can be easily and reliably attached to the support portion 65. Furthermore, since the second extension portion 62B extends radially outward from the drive shaft 91a beyond the hydraulic pump 92, sufficient space can be secured for operating the tool used to attach the fastener V4. Furthermore, the support portion 65 is provided with a knock pin (second knock pin) 67c facing in the axial direction of the input shaft 92a, and the second bracket 62 has a hole (second insertion hole) 62B2 into which the second knock pin 67c is inserted.

[0114] With the above configuration, misalignment of the input shaft 92a with respect to the support portion 65 can be suppressed, and the drive shaft 91a, the connector 60, and the input shaft 92a can be connected with high precision. As a result, power output from the drive shaft 91a to the input shaft 92a can be transmitted appropriately without loss. Furthermore, the second bracket 62 has a first mounting portion 71A for attaching the first suspension device 75A.

[0115] With the above configuration, when attaching the second bracket 62 to the support section 65 while it is attached to the hydraulic pump 92, it can be lifted using the first lifting device 75A. Therefore, the second bracket 62 and the hydraulic pump 92 can be easily attached to the support section 65. Furthermore, by lifting the first lifting device 75A, the electric motor 91 and the hydraulic pump 92 can be easily transported while assembled to the support section 65.

[0116] Furthermore, the support portion 65 has a second mounting portion 71B for attaching the second suspension device 75B. With the above configuration, by lifting the second lifting device 75B in addition to the first lifting device 75A, the electric motor 91 and hydraulic pump 92 can be easily transported while assembled to the support unit 65.

[0117] Furthermore, the hydraulic pump 92 has a spigot fitting portion (second spigot fitting portion) 92b2 formed around the input shaft 92a, and the second bracket 62 has a mounting hole (second mounting hole) 62a into which the second spigot fitting portion 92b2 is mounted. According to the above configuration, misalignment of the drive shaft 91a relative to the second bracket 62 can be suppressed, and the drive shaft 91a, the connector 60, and the input shaft 92a can be connected with high precision. As a result, power output from the drive shaft 91a to the input shaft 92a can be transmitted appropriately without loss.

[0118] Furthermore, the slewing work machine 1 is equipped with a connector 60 that connects the drive shaft 91a and the input shaft 92a, and the hydraulic pump 92 is attached to the support part 65 via the second bracket 62, and with the connector 60 attached to the input shaft 92a, the support part 65 is a housing that surrounds the outer diameter of the connector 60. According to the above configuration, the support portion 65 can support the hydraulic pump 92 and cover the connector 60. Therefore, it is possible to prevent the connector 60, which is rotated by the drive shaft 91a, from coming into contact with the outside.

[0119] Furthermore, the assembly method for the slewing work machine 1 includes an electric motor 91 that rotates a drive shaft 91a, a hydraulic pump 92 having an input shaft 92a to which power is input from the drive shaft 91a and which is driven by the power input from the drive shaft 91a to the input shaft 92a to discharge hydraulic fluid, a support part 65 that supports the electric motor 91 and the hydraulic pump 92, and a second bracket 62 which is separate from the hydraulic pump 92 and connects the hydraulic pump 92 and the support part 65, and the assembly method for the slewing work machine 1 includes a first step of attaching the second bracket 62 to the hydraulic pump 92, and a second step of attaching the second bracket 62 and the hydraulic pump 92 attached in the first step to the support part 65.

[0120] With the above configuration, the hydraulic pump 92 can be easily attached to the support part 65, regardless of the shape of the hydraulic pump 92 or the shape of the support part 65. The slewing work machine 1 described above comprises a slewing platform 2, a battery unit 90, a support body 50 that supports the battery unit 90 on the slewing platform 2, an electric motor 91 driven by the power output of the battery unit 90, a hydraulic pump 92 that is driven by the electric motor 91 to discharge hydraulic fluid, and a support section 65 that supports the electric motor 91 and the hydraulic pump 92 on the slewing platform. The support section 65 is separate from the support body 50 and is attached to the slewing platform 2 via a plurality of mounting devices 70.

[0121] With the above configuration, since the support section 65 supports the electric motor 91 and hydraulic pump 92 separately from the battery unit 90, vibrations generated by the operation of the electric motor 91 and pulsations of the hydraulic pump 92 are suppressed from being directly transmitted to the battery unit 90. In addition, since the battery unit 90 assembly and the electric motor 91 and hydraulic pump 92 assemblies are configured separately, assembly to the turntable 2 is made easier. Furthermore, vibrations generated by the operation of the electric motor 91 and pulsations of the hydraulic pump 92 are suppressed from reaching the battery unit 90 via the support section 65 and the turntable 2. As a result, it is possible to suppress the battery unit 90 from resonating due to such vibrations and pulsations, which would amplify vibrations and generate noise.

[0122] Furthermore, the support 50 is fixed to the turntable 2. According to the above configuration, since the battery unit 90 mounted on the support 50 is fixed to the turntable 2, when vibrations are transmitted from the turntable 2, it does not vibrate independently of the turntable 2, but rather vibrates together with the turntable 2. Therefore, it is possible to suppress the generation of noise, which would otherwise be amplified by the vibrations and pulsations of the battery unit 90 resonating due to these vibrations and pulsations.

[0123] Furthermore, the slewing work machine 1 is equipped with a sway-preventing part (lower upright part) 57 that is erected on the upper part of the support body 50 and attached to at least one of the sides of the battery unit 90, including one side and one other side. With the above configuration, the battery unit 90 can be more firmly fixed to the support 50. As a result, the battery unit 90 can be firmly fixed to the turntable 2, so that when vibrations are transmitted from the turntable 2, the battery unit 90 does not vibrate independently of the turntable 2, and the resonance caused by the vibrations and pulsations of the battery unit 90 can be suppressed, which would amplify the vibrations and generate noise.

[0124] Furthermore, the support section 65 supports the electric motor 91 and the hydraulic pump 92 in a front-to-back direction, and the multiple mounting devices 70 are positioned in a plan view further outward in the width direction than the electric motor 91, the hydraulic pump 92, and the support section 65, with the electric motor 91 and the hydraulic pump 92 attached to the support section 65. According to the above configuration, the multiple mounting devices 70 can suppress vibrations in the width direction when the turntable 2 rotates, and can more effectively support the electric motor 91, hydraulic pump 92, and support section 65. In addition, tools can be easily accessed when attaching the multiple mounting devices 70 to the support section 65.

[0125] Furthermore, the battery unit 90 is positioned in the center of the width direction at the rear of the turntable 2, and the electric motor 91 and hydraulic pump 92 are positioned to the side of the battery unit 90 via the support portion 65. According to the above configuration, the electric motor 91 and hydraulic pump 92, supported by multiple mounting devices 70, can be preferentially placed in the part of the turntable 2 where vibrations are relatively high. As a result, the durability of the equipment placed on the turntable 2 can be improved, while the number of mounting devices 70 can be reduced or the size of the mounting devices 70 can be reduced, thereby reducing costs.

[0126] Furthermore, the slewing work machine 1 includes a first bracket 61 separate from the electric motor 91 and connecting the electric motor 91 to the support part 65, and a second bracket 62 separate from the hydraulic pump 92 and connecting the hydraulic pump 92 to the support part 65. Mounting parts 71 for attaching the lifting device 75 are formed on at least two of the electric motor 91, the first bracket 61, the support part 65, the second bracket 62, and the hydraulic pump 92. By attaching the lifting device 75 to the mounting parts 71, a connected structure in which the electric motor 91 is connected to the support part 65 by the first bracket 61 and the hydraulic pump 92 is connected to the support part 65 by the second bracket 62 can be suspended.

[0127] With the above configuration, the assembly comprising the electric motor 91, first bracket 61, support part 65, second bracket 62, and hydraulic pump 92 can be easily transported to multiple mounting devices 70 by lifting it with the lifting device 75. This allows the assembly to be easily mounted to the multiple mounting devices 70. The electric work machine 1 described above comprises a machine body (turntable) 2, a support 50 provided on the turntable 2, a battery unit 90 mounted on the support 50, and an electric motor 91 driven by the power output by the battery unit 90. The support 50 has a plurality of long plate members 52 on which the outer circumference of the bottom of the battery unit 90 is mounted, and the mounting surface of the plate member 52 on which the battery unit 90 is mounted is machined to be smooth.

[0128] According to the above configuration, the battery unit 90 can be supported with a simple structure made by combining long plate members 52, and it can be stably supported while reducing the area that needs to be machined. Furthermore, the portion of the support 50 other than the mounting surface of the plate member 52 is not machined.

[0129] According to the above configuration, it is possible to reduce the increase in processing costs caused by extensive machining. Furthermore, the support 50 has a frame member 51 that connects a plurality of plate members 52, and the frame member 51 is fixed to the lower surface and / or side surface of the plate members 52 by welding. According to the above configuration, even if the mounting surface is machined, multiple plate members 52 can be reliably supported without removing the welded parts.

[0130] Furthermore, the multiple plate members 52 are fixed to the frame member 51, spaced apart from each other. According to the above configuration, a welding allowance between the plate member 52 and the frame member 51 can be secured. Furthermore, the plate member 52 is machined while it is fixed to the frame member 51 by welding.

[0131] According to the above configuration, even if welding distortion occurs in the plate member 52 due to welding, the battery unit can be reliably supported. Furthermore, the multiple plate members 52 include a first plate portion 52a on which the front end of the battery unit 90 is placed, a second plate portion 52b on which the rear end of the battery unit 90 is placed, a third plate portion 52c on which one end of the battery unit 90 in the width direction is placed, and a fourth plate portion 52d on which the other end of the battery unit 90 in the width direction is placed.

[0132] According to the above configuration, the machined plate member 52 can reliably and easily support the battery unit 90. Furthermore, the support 50 has a long first connecting plate 53 that connects the central part in the width direction of the first plate portion 52a and the central part in the width direction of the second plate portion 52b. According to the above configuration, the connection strength between the first plate portion 52a and the second plate portion 52b can be improved with a simple configuration.

[0133] Furthermore, the support 50 has a second connecting plate 54 that passes through the center of the opening 51E formed in the central part of the frame member 51 and extends from one end to the other in the width direction of the frame member 51, and the first connecting plate 53 and the second connecting plate 54 are perpendicular to each other. According to the above configuration, the strength of the frame member 51 can be improved with a simple structure. Furthermore, the battery unit 90 has a plurality of batteries 90a, which are arranged adjacent to each other in the width direction. The first plate portion 52a has the front ends of the plurality of batteries 90a on it, the second plate portion 52b has the rear ends of the plurality of batteries 90a on it, the third plate portion 52c has one end of the battery at one end of the plurality of batteries 90a in the width direction on it, and the fourth plate portion 52d has the other end of the battery at the other end of the plurality of batteries 90a in the width direction on it.

[0134] According to the above configuration, multiple batteries 90a can be supported with a simple structure consisting of long plate members 52, and stable support can be achieved while reducing the area that needs to be machined. Furthermore, the battery unit 90 has multiple batteries 90a, and the first connecting plate 53 has two adjacent batteries 90a on it, and a ventilation hole 53a is formed between the two batteries 90a.

[0135] According to the above configuration, the two batteries 90a can be securely supported while heat can be dissipated from between the batteries 90a. Therefore, both support and cooling of the batteries 90a can be achieved. Furthermore, the support 50 has a fastener 55 provided on the first plate portion 52a or the second plate portion 52b and for fixing the battery unit 90, and the fastener 55 is attached so as to be adjustable in the front-rear direction.

[0136] According to the above configuration, the battery unit 90 can be securely fixed regardless of any dimensional errors of the battery unit 90. Furthermore, the electric work machine 1 includes a hydraulic device M installed on the turntable 2, and a hydraulic pump 92 that discharges hydraulic fluid to operate the hydraulic device M when driven by an electric motor 91. According to the above configuration, even an electric work machine 1 having a work device 20 driven by hydraulic fluid can achieve the aforementioned unique effects.

[0137] Although the present invention has been described above, 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 above description, and all modifications within the meaning and scope of equivalence to the claims are intended to be included. For example, although the embodiments described above describe the application of the present invention to a backhoe, which is a slewing work machine, the application of the present invention is not limited to this, and can be applied to a variety of work machines such as various construction machines, civil engineering machines, agricultural machines, etc.

[0138] Furthermore, in the above-described embodiment, a configuration was described in which the travel motors ML, MR, the slewing motor MT, and each part of the work device 20 are driven by hydraulics, that is, by the driving force of the electric motor 91 via hydraulic fluid. However, the invention is not limited to this configuration, and some or all of these may be driven directly by the electric motor (electric actuator) 91. [Explanation of Symbols]

[0139] 1. Swivel work machine (electric work machine) 2. Turntable (aircraft) 50 Support 61 First bracket 62 Second bracket 65 Support part 70 Mounting device 71 Mounting part 75 Lifting equipment 90 Battery Units 91 Electric motor 92 Hydraulic pump

Claims

1. Turntable and Battery unit and A support that supports the battery unit on the turntable, An electric motor driven by the power output by the aforementioned battery unit, A hydraulic pump driven by the aforementioned electric motor to discharge hydraulic fluid, A support portion that supports the electric motor and the hydraulic pump on the turntable, A first bracket, which is separate from the electric motor and connects the electric motor and the support portion, A second bracket, separate from the aforementioned hydraulic pump, connects the hydraulic pump and the support portion. Equipped with, The support portion is separate from the support body and is attached to the turntable via a plurality of mounting devices. The first bracket and the second bracket are arranged with a gap between them in one direction, sandwiching the support portion. The electric motor and the hydraulic pump are arranged in a line with the first bracket and the second bracket in between. The plurality of mounting devices are arranged in a plan view on both sides in a direction perpendicular to the one direction of the electric motor and on both sides in a direction perpendicular to the one direction of the hydraulic pump. The mounting device, which is positioned on one side of the electric motor and the hydraulic pump in the orthogonal directions of each, is positioned such that the intermediate position between the mounting device positioned on one side of the electric motor and the mounting device positioned on one side of the hydraulic pump overlaps projectively with respect to the first bracket in the direction orthogonal to the one direction. The mounting device, which is positioned on the other side of the electric motor and the hydraulic pump in the other orthogonal direction, is positioned such that the intermediate position between the mounting device positioned on the other side of the electric motor and the mounting device positioned on the other side of the hydraulic pump overlaps projectively with respect to the support portion in a direction orthogonal to the one direction.

2. The slewing work machine according to claim 1, wherein the support is fixed to the slewing platform.

3. The slewing work machine according to claim 2, further comprising a sway-preventing part erected on the upper part of the support and attached to at least one of the sides of the battery unit.

4. The support portion supports the electric motor and the hydraulic pump in the front-to-back direction, The slewing work machine according to any one of claims 1 to 3, wherein the plurality of mounting devices are located outward in the width direction from the electric motor, the hydraulic pump, and the support portion in a plan view, with the electric motor and the hydraulic pump attached to the support portion.

5. The battery unit is positioned in the center of the width direction at the rear of the turntable. The slewing work machine according to any one of claims 1 to 4, wherein the electric motor and the hydraulic pump are arranged to the side of the battery unit via the support portion.

6. The slewing work machine according to any one of claims 1 to 5, wherein at least two of the electric motor, the first bracket, the support portion, the second bracket, and the hydraulic pump have mounting portions for attaching a lifting device, and by attaching the lifting device to the mounting portions, a connecting structure in which the electric motor is connected to the support portion by the first bracket and the hydraulic pump is connected to the support portion by the second bracket can be suspended.

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