Construction machinery

Abstract

To provide a configuration having an electric device such as an inverter device for controlling an electric motor, which can obtain a high degree of freedom for layout of the device, and enables efficient arrangement of the device in a limited space.SOLUTION: A construction machine includes an electric motor 12 for driving a hydraulic pump 41 by power of a battery unit 47, and an electric fan 62 for generating a flow of air inside a machine body. The electric motor 12 is disposed below the electric fan 62.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a construction machine provided with electrical equipment such as an inverter device for controlling an electric motor, for example.

Background Art

[0002] Conventionally, for example, in a construction machine such as an excavation work machine, there is an electric type equipped with an electric motor as a drive source. In an electric construction machine, electrical equipment such as an inverter device for controlling the electric motor is provided.

[0003] As an electric construction machine, for example, there is an excavation work machine including a lower traveling body and an upper swing body mounted so as to be swingable with respect to the lower traveling body, and an electric motor is mounted on the upper swing body. In this type of construction machine, a compact configuration is required from the viewpoint of reducing the swing radius of the upper swing body, etc., and thus the layout of electrical equipment such as an inverter device becomes important.

[0004] Regarding the layout of electrical equipment in an electric construction machine, for example, there is a technique disclosed in Patent Document 1. Patent Document 1 discloses a technique regarding the installation of a controller and a capacitor in a hybrid excavator including a generator motor driven by an engine as a drive source, a controller including an inverter, and a capacitor.

[0005] Specifically, in the hybrid excavator of Patent Document 1, a cab is arranged on the left side of a swing frame constituting the upper swing body, and tanks for fuel and hydraulic oil are installed on the right side of the swing frame. Then, the controller and the capacitor are stored in an equipment case formed in a stepped shape, and the equipment case is installed in front of the tank.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

[0007] In the configuration disclosed in Patent Document 1, the equipment case that houses electrical equipment such as controllers is formed in a stepped shape, which severely restricts the placement of the electrical equipment. Furthermore, in a configuration where the equipment case containing the electrical equipment is installed in front of the tank, the position on the rotating frame becomes more restricted.

[0008] In particular, when attempting to adopt the configuration disclosed in Patent Document 1 for a relatively small excavation machine, it becomes difficult to secure space for installing electrical equipment on the slewing frame. Therefore, it tends to be difficult to properly position electrical equipment on the slewing frame.

[0009] This invention has been made in view of the above-mentioned problems, and aims to provide a construction machine that, in a configuration equipped with electrical equipment such as an inverter device for controlling an electric motor, can obtain a high degree of freedom in the layout of the equipment and can efficiently arrange the equipment in a limited space. [Means for solving the problem]

[0010] The construction machine according to the present invention comprises a prime mover, a hydraulic oil tank for containing hydraulic oil, a hydraulic pump driven by the prime mover for supplying the hydraulic oil in the hydraulic oil tank to an actuator, and electrical equipment provided at a position spaced apart from the side surface of the hydraulic oil tank.

[0011] In another aspect of the present invention, the construction machine is such that the prime mover is an electric motor driven by power supplied from an external source, and the electrical equipment is a device that controls the power supplied to the electric motor.

[0012] In another aspect of the present invention, the construction machine is configured such that the electrical equipment is supported on a base that supports the hydraulic oil tank.

[0013] Another aspect of the present invention relates to a construction machine, which is equipped with a fan for drawing air into the storage space of the hydraulic oil tank, and the electrical equipment is provided between the fan and an opening formed in the front lower part of the outer cover portion forming the storage space, which communicates the storage space with the outside.

[0014] Another aspect of the present invention relates to a construction machine, wherein the construction machine includes an operating section with a driver's seat mounted on a seat mount provided on the rear side of the floor, the fan is located on one of the left or right edges of the machine body, the hydraulic oil tank is located in front of the fan, the prime mover is located at the rear of the machine body, and a cover for the electrical equipment is provided between the floor and the cover portion that covers the hydraulic oil tank.

[0015] Another aspect of the present invention relates to a construction machine in which the base forms a space on the back side of the support surface that supports the hydraulic oil tank, and is equipped with a second electrical device that is supported on the back side of the support surface.

[0016] In another aspect of the present invention, the construction machine is configured such that the second electrical equipment is provided at a position spaced apart from the back surface of the support surface.

[0017] Another aspect of the present invention relates to a construction machine that includes a third electrical device installed below the second electrical device. [Effects of the Invention]

[0018] According to the present invention, in a configuration including an electrical device such as an inverter device that controls an electric motor, a high degree of freedom can be obtained with respect to the layout of the device, and the device can be efficiently arranged in a limited space.

Brief Description of the Drawings

[0019] [Figure 1] It is a left side view of an excavation work machine according to an embodiment of the present invention. [Figure 2] It is a perspective view from the left front of an excavation work machine according to an embodiment of the present invention. [Figure 3] It is a block diagram showing the device configuration included in an excavation work machine according to an embodiment of the present invention. [Figure 4] It is a perspective view showing an example of the installation mode of the device configuration included in an excavation work machine according to an embodiment of the present invention. [Figure 5] It is a left front perspective view showing an example of the installation mode of the device configuration included in an excavation work machine according to an embodiment of the present invention. [Figure 6] It is a front view showing the support configuration of an operating oil tank and an inverter device according to an embodiment of the present invention. [Figure 7] It is a perspective view showing the support configuration of an operating oil tank and an inverter device according to an embodiment of the present invention. [Figure 8] It is an exploded perspective view showing the support configuration of an inverter device according to an embodiment of the present invention. [Figure 9] It is a front view showing a part of the configuration of an upper swing body according to an embodiment of the present invention. [Figure 10] It is a left side cross-sectional view showing a part of the configuration of an upper swing body according to an embodiment of the present invention. [Figure 11] It is a front view showing the arrangement configuration of a power feeder and a converter according to an embodiment of the present invention. [Figure 12] It is a plan view showing the arrangement configuration of a power feeder according to an embodiment of the present invention. [Figure 13] It is a side view showing the arrangement configuration of a power feeder and a converter according to an embodiment of the present invention. [Figure 14]This is a perspective view showing the arrangement configuration of a power supply and converter according to one embodiment of the present invention. [Figure 15] This is a rear view showing a hydraulic oil tank and drain structure according to one embodiment of the present invention. [Figure 16] This is a bottom-side perspective view showing a hydraulic fluid tank and drain structure according to one embodiment of the present invention. [Figure 17] This is a bottom view showing the drain structure of a hydraulic fluid tank according to one embodiment of the present invention. [Modes for carrying out the invention]

[0020] The present invention aims to improve the flexibility of electrical equipment layout and to efficiently arrange electrical equipment in a limited space by devising the arrangement configuration of electrical equipment, such as an inverter device for controlling an electric motor. Embodiments of the present invention will be described below with reference to the drawings.

[0021] In the embodiments of the present invention, a slewing work vehicle, specifically an excavating work machine (shovel), will be used as an example of the construction machinery according to the present invention. However, the construction machinery according to the present invention is not limited to excavating work machines, but can be broadly applied to other construction machinery such as bulldozers, crane work machines, compact track loaders, skid steer loaders, and wheel loaders.

[0022] The overall configuration of the excavation machine 1 according to this embodiment will be explained with reference to Figures 1 and 2. As shown in Figures 1 and 2, the excavation machine 1 comprises a traveling device 2 as a self-propelled vehicle body and an excavation device 3 as a working unit attached to the traveling device 2.

[0023] The traveling device 2 is the main body of the excavation work machine 1 and has a pair of left and right crawler-type traveling sections 5, 5, a track frame 6 which serves as a base to support the left and right traveling sections 5, 5, and a slewing frame 7 which is provided on the track frame 6.

[0024] The running section 5 has a configuration in which tracks are wound around multiple rotating bodies such as sprockets supported by predetermined frame portions that constitute the track frame 6. The running section 5 has a drive sprocket 5a, which is a drive wheel, as a rotating body at its rear end. The track frame 6 has a center frame portion 6a located in the middle between the left and right running sections 5, 5, and side frame portions 6b provided on both the left and right sides of the center frame portion 6a.

[0025] The swivel frame 7 is configured to be approximately circular in plan view and is provided with a swivel support 6c on the upper side of the track frame 6, allowing it to swivel in either the left or right direction around its vertical axis. Furthermore, the swivel frame 7 is configured to swivel within the width between the left and right running sections 5, 5, that is, within the width between the left outer edge of the left running section 5 and the right edge of the right running section 5. This enables small-circuit operation by the excavating machine 1.

[0026] An operating section 10, which has a flat floor 8, is provided on the slewing frame 7. The floor 8 is located on the left side of the front half of the slewing frame 7. A tank section 9 is provided to the right of the operating section 10. The left side of the floor 8 serves as the operator's entrance / exit to the operating section 10. An electric motor 12, which is the prime mover, is provided at the rear of the slewing frame 7 as the drive source.

[0027] The driver's unit 10 is for operating the traveling device 2 and the excavating device 3. A canopy 13 is provided on the slewing frame 7 for the driver's unit 10. The canopy 13 has a pair of left and right rear support columns 13a, 13a erected above the prime mover, a pair of left and right front support columns 13b, 13b erected at the front end of the floor 8, and a canopy roof section 13c provided between the front and rear support columns. The canopy roof section 13c covers the driver's unit 10 from above.

[0028] In the driver's unit 10, a driver's seat support base 14, which is a seat mount, is provided at the rear of the floor 8, and a driver's seat 15 is provided on the driver's seat support base 14. In front of the driver's seat 15, a pair of left and right travel levers 16 are provided, extending upward from the floor 8. Multiple operating pedals 17 for work are arranged on both the left and right sides of the travel levers 16 on the floor 8. In addition, in the driver's unit 10, an operation panel section is provided around the driver's seat 15, which has work operation levers for operating work equipment such as the excavation device 3, and various operating parts such as switches.

[0029] The excavation work machine 1 has a lower traveling body 20A which includes a track frame 6 and traveling sections 5, 5 supported on both the left and right sides of the track frame, and an upper rotating body 20B which is mounted on the lower traveling body 20A so as to be rotatable. The upper rotating body 20B is composed of a rotating frame 7 which is a frame that constitutes the machine body, and an operating section 10 which is provided on the rotating frame 7.

[0030] Furthermore, a hydraulic oil tank 30 for storing hydraulic fluid is provided in the tank section 9 located to the right of the driver's unit 10 (see Figure 4). The hydraulic oil tank 30 is located at the front right side of the slewing frame 7. The hydraulic fluid in the hydraulic oil tank 30 is supplied to hydraulic cylinders and other components of the drilling machine 1, which constitute the drilling device 3.

[0031] The hydraulic oil tank 30 is covered by a right cover portion 31. The right cover portion 31 is a cover portion that covers the hydraulic oil tank 30 and the radiator 61 located behind it, and forms the right side portion of the exterior cover portion that forms the exterior of the upper slewing body 20B. The exterior cover portion of the upper slewing body 20B includes a rear cover portion 32 that forms the rear portion, a left cover portion 33 that forms the left side portion of the exterior cover portion, a front lower cover portion 34 that covers the front lower portion of the upper slewing body 20B, and a left front cover portion 35 located below the left end of the floor portion 8. The rear cover portion 32 is rotatably supported on one side by a hinge portion. The left cover portion 33 covers the left side of the driver's seat support base 14. A counterweight 142 is provided below the rear cover portion 32.

[0032] The excavation device 3 is a front working device located on the front side of the traveling device 2. A support bracket 18 for supporting the excavation device 3 is provided projecting forward from the left and right center of the front end of the slewing frame 7. The boom support bracket 19, which forms the base end of the excavation device 3, is supported by the support bracket 18 so as to be rotatable in the vertical direction with the rotation axis as the axis of rotation. The excavation device 3 is provided to swing left and right relative to the slewing frame 7 by a swing hydraulic cylinder 20 (see Figure 9) provided between the boom support bracket 19 and the slewing frame 7 on the right side of the boom support bracket 19.

[0033] The swing hydraulic cylinder 20 is located between the boom support bracket 19 and the slewing frame 7. The rear bottom end of the swing hydraulic cylinder 20 is pivotally supported on the base plate portion 80 of the slewing frame 7, while the front rod end is pivotally supported on the boom support bracket 19.

[0034] The excavation device 3 has a boom 21 that is bent in a boomerang shape when viewed from the side and forms the base portion of the excavation device 3, an arm 22 connected to the tip of the boom 21, and a bucket 23 attached to the tip of the arm 22. The excavation device 3 has a boom cylinder 26 that rotates the boom 21, an arm cylinder 27 that rotates the arm 22, and a work tool cylinder 28 that rotates the bucket 23. All of these cylinders are hydraulic cylinders.

[0035] The bucket 23 is detachably connected to the tip of the arm 22 via an attachment attachment device 29 as a work attachment. In the excavation device 3, other devices such as a grapple or breaker may be attached in place of the bucket 23 depending on the work to be done.

[0036] In the excavation machine 1 having the above configuration, the desired movements and operations are performed by an operator seated in the driver's seat 15, who appropriately operates the travel lever 16, work operation levers, etc. Specifically, for example, by operating the travel lever 16, the travel device 2 is made to travel straight forward and backward or turn left and right. In addition, by operating the work operation levers, excavation work is performed by the excavation device 3.

[0037] The excavation work machine 1 according to this embodiment is an electric construction machine equipped with an electric motor 12 as a drive source. As shown in Figure 3, the electric motor 12 is a pump drive motor that drives the hydraulic pump 41. The electric motor 12 is, for example, a three-phase AC motor and is driven by the supply of AC power. The hydraulic pump 41 is driven by the electric motor 12 to supply hydraulic oil from the hydraulic oil tank 30 to the actuator 43 via the control valve 42.

[0038] Actuator 43 is a general term for the various hydraulic actuators provided by the excavation work machine 1. Examples of actuators 43 include the boom cylinder 26, arm cylinder 27, work tool cylinder 28, swing hydraulic cylinder 20, and slewing hydraulic cylinder.

[0039] The control valve 42 controls the flow of pressurized oil to each hydraulic actuator, which acts as an actuator 43. The control valve 42 is composed of multiple directional control valves corresponding to each hydraulic actuator, and by controlling the operation of the directional control valves, it controls the amount and destination of pressurized oil supplied from the hydraulic oil tank 30 by the drive of the hydraulic pump 41. The operation of the drilling device 3 and the rotation of the upper rotating body 20B are performed by controlling the supply of pressurized oil to the actuators 43.

[0040] As shown in Figure 4, the electric motor 12 is installed laterally at the rear lower part of the slewing frame 7, with the axial direction of the drive shaft being left-right. A hydraulic pump 41 is provided to the left of the electric motor 12. The hydraulic pump 41's rotating shaft is connected to the drive shaft of the electric motor 12 via a coupling, and it is driven in conjunction with the rotation of the drive shaft of the electric motor 12, supplying hydraulic fluid. The control valve 42 is provided at a predetermined position on the slewing frame 7 in the upper slewing body 20B (for example, on the left side of the front of the slewing frame 7).

[0041] Furthermore, the excavation work machine 1 has a pair of left and right hydraulic motors 44, 44 for travel (see Figures 1 and 2). The hydraulic motors 44 are driven by the supply of pressurized oil from the control valve 42, and are installed in each travel section 5 to rotate the drive sprocket 5a while attached to a predetermined part such as the side frame section 6b of the track frame 6. The left and right hydraulic motors 44, 44 drive the travel section 5, enabling the travel device 2 to travel straight forward and backward, and to turn left and right.

[0042] As shown in Figure 3, the excavation work machine 1 includes a power supply 46 for supplying power to the electric motor 12 from an external source, a battery unit 47 which is a battery for supplying power to the electric motor 12, and an inverter device 48 for controlling the electric motor 12, all of which are electrically connected to the electric motor 12 either directly or indirectly.

[0043] As shown in Figure 3, the power supply unit 46 is electrically connected to the commercial power supply 49, which is an external power source, by a power supply line 51 for external power supply. In other words, the power supply unit 46 takes power from the commercial power supply 49, which is an external power source, by the power supply line 51. The power supply line 51 is made up of cables, etc. The power supply unit 46 is also electrically connected to the battery unit 47 and the inverter device 48, respectively.

[0044] The power supply unit 46 has the function of converting AC power (AC voltage) supplied from the commercial power supply 49 into DC power (DC voltage) and outputting it to the inverter device 48, the function of converting AC power supplied from the commercial power supply 49 into DC power and outputting it to the battery unit 47, and the function of outputting DC power from the battery unit 47 to the inverter device 48. The power supply unit 46 is configured to switch the functions it performs by switching modes. The power supply unit 46 controls the current and voltage values ​​of the supplied power.

[0045] The excavation work machine 1 has the following three power supply modes, which can be switched by operating a mode switching switch provided, for example, in the operation unit 10. Specifically, the excavation work machine 1 has a battery power supply mode in which the electric motor 12 is powered only by the battery unit 47, an external power supply mode in which the electric motor 12 is powered by a power supply 46 from an external commercial power source 49, and a power storage mode in which the power supply 46 stores power from the external commercial power source 49 in the battery unit 47.

[0046] The external power supply mode includes cases in which at least one of the following occurs: charging of the battery unit 47 by power supply from the commercial power supply 49 via the power supply unit 46, and power supply from the battery unit 47 to the electric motor 12. That is, in the battery power supply mode, the electric motor 12 is driven by power supplied from the battery unit 47, and in the external power supply mode, it is driven by power supplied from the commercial power supply 49, and in some cases, it also receives power for driving from the battery unit 47.

[0047] The battery unit 47 is the power source for the excavation work machine 1. The battery unit 47 is a unitized configuration of multiple battery modules. The battery modules consist of secondary batteries such as lead-acid batteries and lithium-ion batteries. The battery unit 47 supplies direct current to the inverter device 48.

[0048] As shown in Figures 4 and 5, the battery unit 47 is installed at the rear of the slewing frame 7, above the electric motor 12. In Figure 4, for convenience, the battery unit 47 is shown by a dashed line.

[0049] The battery unit 47 has a rectangular parallelepiped battery body 70 and is installed at the rear of the slewing frame 7 so that the battery body 70 is positioned above the electric motor 12. The battery unit 47 is installed so that the front, rear, left, and right surfaces of the battery body 70 face the front, rear, left, and right of the upper slewing body 20B.

[0050] The battery unit 47 is supported on the base plate portion 80 that constitutes the slewing frame 7 via a predetermined support member. The base plate portion 80 is the part that forms the bottom surface of the slewing frame 7 and is composed of horizontally arranged plate-shaped frame members, etc. The base plate portion 80 has a flat upper surface 80a. Multiple openings 80b are formed in the base plate portion 80.

[0051] A floor frame 89 for providing the floor portion 8 is provided on the left side and front of the base plate portion 80. The floor frame 89 includes a horizontal frame portion 89a provided parallel to the base plate portion 80. A front lower cover portion 34 is provided in a manner that it is installed between the front edge of the base plate portion 80 and the front edge of the horizontal frame portion 89a.

[0052] On the base plate portion 80, a pair of left and right vertical plates 88 are provided, positioned to extend approximately along the front-to-back direction from the rear of the support bracket 18 located in the left-right center of the front side of the swivel frame 7. The vertical plates 88 are fixed to the base plate portion 80 and constitute a part of the swivel frame 7.

[0053] The right vertical plate 88 extends to the rear end of the slewing frame 7, demarcating the locations for the electric motor 12 and the radiator 61. The left vertical plate 88 extends to the vicinity of the front of the electric motor 12, and the control valve 42 is located to the left of the left vertical plate 88. The front portions of the left and right vertical plates 88 extend forward from the front lower cover portion 34, forming the left and right side portions of the support bracket 18.

[0054] As shown in Figure 5, the battery unit 47 is supported by the base plate portion 80 of the slewing frame 7 by left and right lower vibration-damping support portions 81 that provide vibration-damping support to the lower side of the battery unit 47, and left and right upper vibration-damping support portions 82 that provide vibration-damping support to the upper side of the battery unit 47. The lower vibration-damping support portions 81 are provided at the front end of the battery unit 47, and the upper vibration-damping support portions 82 are provided at the rear end of the battery unit 47.

[0055] The lower vibration-damping support section 81 is provided on gate-shaped support legs 85 located on the upper surface 80a of the base plate section 80. The upper vibration-damping support section 82 is provided on a gate-shaped frame section 110 located on the base plate section 80. The gate-shaped frame section 110 is composed of a pair of left and right stay sections 111 erected on the base plate section 80 and a horizontal frame section 112 installed between the left and right stay sections 111.

[0056] An electric motor 12 and a hydraulic pump 41 are positioned horizontally in the space below the battery body 70 on the base plate 80. The electric motor 12 and hydraulic pump 41 (hereinafter referred to as the "motor-pump unit"), which are connected to each other via a coupling, are vibration-damped and supported from the slewing frame 7 by a plurality of vibration-damping support parts 140. In this embodiment, as shown in Figure 4, the vibration-damping support parts 140 are provided in a total of four locations: two on the left and right sides of the front of the motor-pump unit and two on the left and right sides of the rear of the motor-pump unit.

[0057] In the vibration-damping support section 140, a support stay extending from the motor / pump unit is supported by a predetermined support section provided on the base plate section 80 of the swivel frame 7. The vibration-damping support section 140 is composed of an elastic section made of an elastic material such as rubber, and a fixing section for fixing the support stay extending from the motor / pump unit to the predetermined support section on the swivel frame 7 side.

[0058] The inverter device 48 is a device that directly or indirectly controls the power supplied to the electric motor 12. The inverter device 48 controls the output of the electric motor 12 by controlling the power output to the electric motor 12. Specifically, the inverter device 48 converts the DC power supplied from the battery unit 47 into AC power and supplies it to the electric motor 12. The inverter device 48 also supplies AC power supplied from the commercial power supply 49 via the power supply unit 46 to the electric motor 12 at a predetermined voltage.

[0059] Specifically, the inverter device 48 includes an inverter circuit that generates AC power from DC power and supplies it to the electric motor 12, a calculation and control unit that controls this inverter circuit, and a rectifier circuit that converts AC power supplied from the commercial power supply 49 via the power supply 46 into DC power, boosts the voltage, and outputs it to the inverter circuit. The calculation and control unit is configured, for example, by a microcomputer.

[0060] In external power supply mode, the inverter device 48 converts AC power supplied from the commercial power supply 49 via the power supply 46 into DC power using a rectifier circuit and outputs it to the inverter circuit, where it generates AC power and supplies it to the electric motor 12. On the other hand, in battery power supply mode, the inverter device 48 receives DC power input from the battery unit 47 into the inverter circuit, generates AC power in the inverter circuit and supplies it to the electric motor 12.

[0061] Furthermore, as shown in Figure 4, the excavation work machine 1 is equipped with a radiator 61 as a cooling system that cools the cooling water supplied to the electric motor 12, inverter device 48, power supply 46, etc. The radiator 61 is a heat exchanger for cooling various devices and equipment, and cools the cooling water circulating through a predetermined cooling channel. An electric fan 62 is provided for the radiator 61. The radiator 61 has a communication section through which air passes, and the cooling water is cooled as air passes through the communication section due to the air blown from the electric fan 62.

[0062] As shown in Figure 4, the radiator 61 has a roughly rectangular, thick plate-like outer shape and is erected on the right side of the rear of the slewing frame 7. The radiator 61 is positioned adjacent to the rear of the hydraulic oil tank 30. In a plan view, the radiator 61 is inclined so as to follow the roughly circular outer shape of the slewing frame 7, with its rear side positioned inward on both sides in the front-rear direction. The electric fan 62 is integrally mounted with the radiator 61 on the inner side surface 61a of the radiator 61, covering most of the side surface 61a. The electric fan 62 is driven by power supplied from the commercial power supply 49 or the battery unit 47. The power supplied from the commercial power supply 49 or the battery unit 47 is voltage-reduced by a DC / DC converter (converter 230, described later) before being supplied to the electric fan 62, etc.

[0063] The arrangement and mounting structure of the inverter device 48 will be explained using Figures 6 to 10. The inverter device 48 is located on the left and right inner sides (left side) of the hydraulic oil tank 30, which is located at the front right side of the slewing frame 7, that is, on the side of the pivot center of the upper slewing body 20B. The inverter device 48 has a roughly rectangular, thick plate-like outer shape, with its plate surface oriented vertically, and is installed parallel to the left side surface 30a of the hydraulic oil tank 30, so as to be aligned with the left side surface 30a.

[0064] The hydraulic oil tank 30 is installed on a tank support base 150, which serves as a base provided on the base plate portion 80. The tank support base 150 is fixedly installed on the base plate portion 80.

[0065] The hydraulic oil tank 30 has a vertically elongated, roughly rectangular parallelepiped shape with respect to its tank body 130, and is erected on a tank support base 150. In a plan view, the tank body 130 has a shape where the left-right direction is the shorter side and the front-back direction is the longer side, and in a front view, the left-right direction is the shorter side and the up-down direction is the longer side.

[0066] The tank body 130 has a vertical surface consisting of a left side surface 30a that runs along the front-rear direction, a front surface 30b that runs along the left-right direction, a right front inclined surface 30c that forms the front of the right side surface, a rear surface 30d that is the surface opposite to the front surface 30b, and a right rear inclined surface 30e that is the surface between the rear surface 30d and the right front inclined surface 30c and forms the rear of the right side surface (see Figure 15). The tank body 130 has the right front inclined surface 30c inclined from the rear to the front in a direction from the left and right outer to the inward direction, and the right rear inclined surface 30e inclined from the rear to the front in a direction from the left and right inner to the outward direction. The tank body 130 has a curved shape with the right side convex, formed by the right front inclined surface 30c and the right rear inclined surface 30e, so that it does not protrude from the arc-shaped outer shape along which the slewing frame 7 runs when viewed in plan.

[0067] Furthermore, the tank body 130 has a horizontal rear upper surface 30f and a front inclined surface 30g as its upper surface. The front inclined surface 30g is an inclined surface that slopes downwards towards the front. The tank body 130 also has a horizontal bottom surface 30h. A fuel filler port 125 is provided on the rear upper surface 30f.

[0068] The tank support base 150 is made up of a plate-shaped member bent into a predetermined shape, and has a support surface portion 151, an outer surface portion 152, a lower fixed surface portion 153, and an inner surface portion 154. The support surface portion 151 is a horizontal surface portion that forms the upper surface of the tank support base 150, and has a roughly rectangular outer shape in plan view. The upper surface of the support surface portion 151 becomes the support surface 151a that supports the hydraulic oil tank 30, etc. In plan view, the tank support base 150 is installed in an inclined shape so that its front side faces inward (left side) to match the arc-shaped outer shape along which the slewing frame 7 follows.

[0069] The outer surface portion 152 is a vertical surface portion formed by bending downward from the right edge of the support surface portion 151. The lower fixed surface portion 153 is a horizontal surface portion formed by bending inward to the left and right from the lower end of the outer surface portion 152. The inner surface portion 154 is a vertical surface portion formed by bending downward from the left edge of the support surface portion 151. The lower fixed surface portion 153 is a narrower portion compared to the support surface portion 151, and the inner surface portion 154 has a shorter extension length downward from the support surface portion 151 compared to the outer surface portion 152.

[0070] As shown in Figure 6, the tank support base 150 is fixed to the base plate portion 80 with its lower fixing surface portion 153 aligned with the upper surface 80a of the base plate portion 80. The lower fixing surface portion 153 is fixed to the base plate portion 80 by fixing bolts 155 at two fixing points, front and rear (see Figure 6). The fixing bolts 155 pass through the base plate portion 80 and the lower fixing surface portion 153 from below and are screwed into nuts 156 provided on the lower fixing surface portion 153. The lower fixing surface portion 153 has holes 153a formed therein for the fixing bolts 155 to pass through (see Figure 8).

[0071] Furthermore, the tank support base 150 is fixed to the vertical plate 88R with the lower part of the inner surface portion 154 aligned with the right side of the right vertical plate 88R of the left and right vertical plates 88. The inner surface portion 154 is fixed to the vertical plate 88R by fixing bolts 157 at two fixing points at the front and rear (see Figure 6). The fixing bolts 157 pass through the vertical plate 88R and the inner surface portion 154 from the left side and are screwed into nut portions 158 provided on the right side of the inner surface portion 154. Holes 154a are formed in the inner surface portion 154 for the fixing bolts 157 to pass through.

[0072] Thus, the tank support base 150 is fixed to the base plate portion 80 and the vertical plate 88R, and is installed in a manner that it is suspended between them. The tank support base 150 forms a space 159 on the base plate portion 80 with open sides on both the front and rear. On both the front and rear sides of the space 159, a roughly rectangular opening is formed by the gate-shaped tank support base 150, the horizontal base plate portion 80, and the vertical plate 88R which is provided vertically on the base plate portion 80.

[0073] The hydraulic oil tank 30 is fixed to the support surface portion 151 of the tank support base 150 at multiple points by fixing bolts 160. The hydraulic oil tank 30 has a plate-shaped fixing plate portion 161 fixed to the bottom surface portion 30h of the tank body portion 130, and the fixing plate portion 161 is fixed to the support surface portion 151 by fixing bolts 160.

[0074] The fixing bolt 160 penetrates the end of the fixing plate portion 161 and the support surface portion 151 from above and is screwed into a nut portion 162 provided on the lower side of the support surface portion 151. The hydraulic oil tank 30 is supported and fixed to the support surface portion 151 of the tank support base 150 by interposing the fixing plate portion 161 between the tank body portion 130 and the support surface portion 151 of the tank support base 150, with a gap equal to the thickness of the fixing plate portion 161 between the bottom surface portion 30h of the tank body portion 130 and the support surface portion 151a of the tank support base 150. Four holes 151f are formed in the support surface portion 151 for passing the fixing bolt 160 through (see Figure 12).

[0075] The inverter device 48 is fixed to the mounting support frame 170 and is vibration-damped and supported by the hydraulic oil tank 30 and the tank support base 150, respectively. In other words, the inverter device 48 together with the mounting support frame 170 constitutes an integrated support 50 (see Figure 8), and this support 50 is vibration-damped and supported by the hydraulic oil tank 30 and the tank support base 150, respectively.

[0076] The mounting support frame 170 is composed of a plate-shaped member that has been bent into a predetermined shape. The mounting support frame 170 has a vertical support plate portion 171 on which the inverter device 48 is mounted, a horizontal upper support surface portion 172 provided above the support plate portion 171, and a horizontal lower support surface portion 173 provided below the support plate portion 171.

[0077] The support plate portion 171 is a rectangular plate-shaped part having approximately the same size as the external dimensions of the inverter device 48, corresponding to the roughly rectangular external dimensions of the inverter device 48 when viewed from the left side. The inverter device 48 is fixed to the support plate portion 171 by fixing bolts 175 at its four corners, covering approximately the entire left side surface 171a, which is the inner (left) plate surface of the support plate portion 171. The fixing bolts 175 pass through the flange portions 48a formed at the four corners of the casing of the inverter device 48 and the support plate portion 171, and are screwed into nuts 176 provided on the right side surface 171b, which is the outer (right) plate surface of the support plate portion 171.

[0078] The upper support surface portion 172 is a horizontal surface portion formed by bending from the upper edge of the support plate portion 171 toward the left. The lower support surface portion 173 is a horizontal surface portion formed by bending from the lower edge of the support plate portion 171 toward the left.

[0079] The supported structure 50, including the inverter device 48, is vibration-damped and supported by vibration-damping rubber 180, which is a vibration-damping member, from the hydraulic oil tank 30 and the tank support base 150, respectively. The support portions provided by the vibration-damping rubber 180 are located at two points, front and rear, on both the upper support surface 172 and the lower support surface 173.

[0080] The support portion of the inverter device 48 for the hydraulic oil tank 30 will now be described. The upper support surface portion 172 is supported by an upper mounting seat 183 provided on the left side surface portion 30a of the hydraulic oil tank 30 via an upper support stay 182. The upper support stay 182 is a longitudinal angle member and has a support surface portion 182a in which the vibration-damping rubber 180 is interposed, and a fixing surface portion 182b which is the fixing portion for the upper mounting seat 183, and these surfaces form a roughly "L" shaped cross-section.

[0081] The upper mounting seat 183 is provided as a portion that protrudes from the flat left side surface 30a. The upper mounting seat 183 is provided by fixing a longitudinal U-shaped steel member, which has a roughly "U"-shaped cross-section, to the left side surface 30a by welding or the like, with the open side facing the left side surface 30a. The upper mounting seat 183 is provided at the upper end of the left side surface 30a, with its longitudinal direction aligned with the upper edge of the left side surface 30a.

[0082] The upper mounting seat 183, together with the left side surface 30a of the hydraulic oil tank 30, forms a roughly rectangular prism-shaped hollow section 184 with both the front and rear ends open. The upper mounting seat 183 has a side surface parallel to the left side surface 30a which forms a vertical support surface 183a. The support surface 183a is spaced apart from the left side surface 30a by the width dimension of the upper and lower surfaces of the upper mounting seat 183.

[0083] The vibration-damping rubber 180 is made of an elastic material such as natural rubber or nitrile rubber. As shown in Figure 8, the vibration-damping rubber 180 has a rotating body shape centered on a predetermined central axis and has a hole 180a that penetrates the central axis. The vibration-damping rubber 180 also has a flange-shaped enlarged diameter portion 180b in the axial middle section and an outer circumferential groove 180c above the enlarged diameter portion 180b.

[0084] In the support portion of the inverter device 48 for the hydraulic oil tank 30, that is, the upper support portion, the vibration-damping rubber 180 is interposed between the upper support surface portion 172 of the mounting support frame 170 and the upper support stay 182. The vibration-damping rubber 180 is supported by the upper support surface portion 172 with a cylindrical support shaft 185 protruding upward from the upper support surface portion 172 inserted into the hole portion 180a. The vibration-damping rubber 180 is also engaged with the upper support stay 182 with the inner peripheral edge of the circular through hole portion 182c formed in the support surface portion 182a fitted into the outer peripheral groove 180c.

[0085] The vibration-damping rubber 180, attached to the upper support surface 172 and the upper support stay 182 respectively, has its portion below the outer circumferential groove 180c sandwiched between the upper support surface 172 and the support surface 182a of the upper support stay 182. Furthermore, the portion of the vibration-damping rubber 180 above the outer circumferential groove 180c protrudes above the support surface 182a through the through hole 182c. The upper part of the vibration-damping rubber 180 penetrates the through hole 182c from below due to elastic deformation.

[0086] The upper support stay 182 is fixed to the upper mounting seat 183 at two points, front and rear, by fixing bolts 186, with the fixing surface portion 182b aligned with the support surface portion 183a of the upper mounting seat 183. The fixing bolts 186 pass through the fixing surface portion 182b and the support surface portion 183a and are screwed into nut portions 187 provided on the back side of the support surface portion 183a. Holes 182d and 183d are formed in the fixing surface portion 182b and the support surface portion 183a, respectively, for passing the fixing bolts 186 through.

[0087] The support portion of the inverter device 48 to the tank support base 150 will now be described. The lower support surface portion 173 is supported by vibration-damping rubber 180 on a lower mounting seat 191 provided on the support surface 151a of the support surface portion 151. The lower mounting seat 191 is provided at two locations, front and rear, corresponding to each vibration-damping rubber 180.

[0088] The lower mounting seat 191 is provided as a portion that protrudes from the flat support surface 151a. The lower mounting seat 191 is provided by fixing a U-shaped steel member, which has a roughly "U"-shaped cross-section, to the support surface 151a by welding or the like, with the open side facing the support surface 151a. The lower mounting seat 191 is provided on the left side of the hydraulic oil tank 30 on the support surface 151a, so as to align the orientation of the front and rear openings with the orientation of the front and rear openings of the support surface portion 151.

[0089] The lower mounting seat 191, together with the support surface 151a of the support surface portion 151, forms a hollow portion 192 with both the front and rear ends open. The upper portion of the lower mounting seat 191, which is parallel to the support surface 151a, forms a horizontal support surface portion 191a. The support surface portion 191a is spaced apart from the support surface 151a by the vertical dimension of the left and right surfaces of the lower mounting seat 191.

[0090] In the support portion of the inverter device 48 to the tank support base 150, that is, the lower support portion, the vibration-damping rubber 180 is interposed between the lower support surface portion 173 of the mounting support frame 170 and the lower mounting seat 191. The vibration-damping rubber 180 is supported by the lower mounting seat 191 with a cylindrical support shaft 195 protruding upward from the support surface portion 191a inserted into the hole portion 180a. The vibration-damping rubber 180 is also engaged with the lower support surface portion 173 with the inner peripheral edge of the circular through hole portion 173a formed in the lower support surface portion 173 fitted into the outer peripheral groove 180c.

[0091] The vibration-damping rubber 180, attached to the lower mounting seat 191 and the lower support surface 173 respectively, has its portion below the outer circumferential groove 180c sandwiched between the lower mounting seat 191 and the lower support surface 173. Furthermore, the portion of the vibration-damping rubber 180 above the outer circumferential groove 180c protrudes above the lower support surface 173 through the through hole 173a. The upper part of the vibration-damping rubber 180 penetrates the through hole 173a from below due to elastic deformation.

[0092] As described above, the inverter device 48 is vibration-damped and supported by vibration-damping support parts 190 using vibration-damping rubber 180 at a total of four locations: two on the upper side and two on the lower side, via the mounting support frame 170 to the hydraulic oil tank 30 and the tank support base 150. The two upper vibration-damping support parts 190A and 190B are located near the front and rear ends of the inverter device 48, respectively. Similarly, the two lower vibration-damping support parts 190C and 190D are located near the front and rear ends of the inverter device 48, respectively. The upper and lower vibration-damping support parts 190A and 190C located on the front side, and the upper and lower vibration-damping support parts 190B and 190D located on the rear side, are located at approximately the same position in the front-rear direction.

[0093] Furthermore, the mounting support frame 170 that supports the inverter device 48 is provided so as to cover most of the hydraulic oil tank 30, excluding the upper and front edges of the left side portion 30a. The inverter device 48 is also provided supported by a tank support base 150 that supports the hydraulic oil tank 30.

[0094] As described above, the inverter device 48, which is vibration-damped and supported at four points, is an example of electrical equipment installed at a position spaced apart from the hydraulic oil tank 30, which is the side surface of the hydraulic oil tank 30. In this embodiment, the inverter device 48 has a support plate portion 171 of the mounting support frame 170 interposed between it and the hydraulic oil tank 30, and the support plate portion 171 is spaced apart from the side surface of the hydraulic oil tank 30.

[0095] The support plate portion 171 has a surface parallel to the left side surface portion 30a of the hydraulic oil tank 30. The mounting support frame 170 is provided with a gap between the support plate portion 171 and the left side surface portion 30a of the hydraulic oil tank 30. In other words, there is a gap 196 of dimension S1 between the right side surface 171b of the support plate portion 171 and the left side surface portion 30a of the hydraulic oil tank 30 (see Figure 6). The gap 196 is a space between the right side surface 171b and the left side surface portion 30a, which are vertical surfaces aligned in the front-rear direction and facing each other in the left-right direction.

[0096] Thus, the inverter device 48 has a support plate portion 171 interposed between it and the left side portion 30a of the hydraulic oil tank 30, with a gap 196 in between. The presence or absence of a gap between the support plate portion 171 and the inverter device 48 is not limited.

[0097] Furthermore, the excavation work machine 1 of this embodiment is equipped with an electric fan 62 attached to the left side of the radiator 61 as a fan for drawing air into the storage space 197 of the hydraulic oil tank 30. The storage space 197 that houses the hydraulic oil tank 30 is the space inside the right cover portion 31, which forms the outer cover portion of the tank portion 9 located to the right of the driver's unit 10 (see Figure 10). Figure 10 is a schematic diagram showing the cross-section as seen by the arrow at position AA in Figure 9.

[0098] Furthermore, an opening 198 is formed in the front lower part of the outer cover portion that forms the storage space 197 of the hydraulic oil tank 30, allowing the storage space 197 to communicate with the outside. The opening 198 is formed in the front lower cover portion 34 of the outer cover portion, which covers the front lower part of the upper slewing body 20B. The opening 198 is located below the floor portion 8 that extends from the driver's seat support base 14 to the front end of the upper slewing body 20B, and is formed at the front end of the upper slewing body 20B.

[0099] As shown in Figure 9, the opening 198 is formed in the front lower cover portion 34 to the right of the support bracket 18 that supports the excavation device 3. The opening 198 is formed by a notched opening 34a that is continuous with the opening that allows the support bracket 18 to protrude forward in the left and right central part of the front lower cover portion 34, the base plate portion 80, and the right side portion of the support bracket 18, forming a substantially rectangular opening in a front view. The swing hydraulic cylinder 20 is located in the space 159 formed by the tank support base 150 and extends forward from the opening 198.

[0100] In this configuration, the inverter device 48 is located between the opening 198 and the electric fan 62. As shown in Figures 4 and 10, the hydraulic oil tank 30 and the radiator 61 are erected on the right edge of the base plate portion 80, arranged front to back, so that they fit within the arc-shaped outer shape along which the slewing frame 7 follows in a plan view. In particular, the radiator 61 is located at the rear of the base plate portion 80, and is inclined from the front to the rear in a plan view, moving from the outside (right side) to the inside (left side) in the left-right direction.

[0101] An inverter device 48 is provided along the inner (left) side of the hydraulic oil tank 30, and an electric fan 62 is provided along the inner (left) side of the radiator 61. On the other hand, an opening 198 is formed at the front lower part of the hydraulic oil tank 30. With this configuration, the opening 198, the inverter device 48, and the electric fan 62 are arranged in order from the front to the rear in the front-to-back direction.

[0102] Furthermore, the excavation machine 1 of this embodiment includes an operating section 10 in which an operating seat 15 is installed on an operating seat support base 14 provided on the rear side of the floor 8. The operating seat support base 14 has a horizontal upper surface portion 14a that supports the operating seat 15 and a front surface portion 14b that rises vertically from the rear edge of the floor 8.

[0103] In this configuration, the electric fan 62 is located to the right of the driver's seat support base 14 and is positioned on the right edge of the upper slewing body 20B. The hydraulic oil tank 30 is located adjacent to the front of the electric fan 62. The electric motor 12 is located below the driver's seat support base 14 and is positioned at the rear of the upper slewing body 20B. An inner cover 199, which covers the inverter device 48, is provided between the floor 8 and the right cover portion 31, which is a cover portion that covers the hydraulic oil tank 30.

[0104] As shown in Figures 2, 9, and 10, the inner cover 199 forms a cover portion that protrudes in a stepped manner to the left on the left side surface of the right cover portion 31. The inner cover 199 has an inner surface portion 199a which is the left side surface, a flat upper surface portion 199b, and a curved front surface portion 199c formed in front of the upper surface portion 199b.

[0105] In a left side view, the inner cover 199 is positioned within the outer shape of the right cover portion 31 on both its upper and front sides. In other words, in a left side view, the inner cover 199 is provided so as not to protrude above or in front of the outer shape of the right cover portion 31. The upper surface portion 199b of the inner cover 199 is positioned below the upper end of the right cover portion 31, and the curved front portion 199c is positioned inward (rear and lower) from the outer shape of the right cover portion 31 in a side view.

[0106] The inner surface portion 199a is a vertical surface portion that runs along the front-rear direction and rises from the right edge of the horizontal floor portion 8. Furthermore, the front lower portion of the inner surface portion 199a is provided so as to form a right angle in a plan cross-sectional view together with the front portion 14b of the driver's seat support base 14.

[0107] The upper surface portion 199b is located at the rear of the inner cover 199 in the front-rear direction. The curved front surface portion 199c is a surface portion that is continuous with the front side of the upper surface portion 199b and is curved downwards toward the front. The lower end of the curved front surface portion 199c reaches the floor portion 8. The upper surface portion 199b and the curved front surface portion 199c form a series of surfaces with substantially constant dimensions in the left-right direction, and in the inner cover 199, it protrudes to the left from the left side surface portion of the right cover portion 31.

[0108] The internal space of the inner cover 199 is a continuous space to the left of the housing space 197 for the hydraulic oil tank 30, and substantially the entire inverter device 48 supported by the mounting support frame 170 is located inside the inner cover 199 (see Figure 9). In the left-right direction, the hydraulic oil tank 30 is located in the housing space 197 to the right of the portion covered by the inner cover 199. Also, inside the inner cover 199, the radiator 61 and the electric fan 62 are located behind the inverter device 48 (see Figure 10).

[0109] As described above, in the driver's seat 10, an inner cover 199 is provided to cover the inverter device 48 as a cover portion rising from the floor 8 to the right of the feet of the operator seated in the driver's seat 15.

[0110] The arrangement and mounting structure of the power supply unit 46 will be explained using Figures 11 to 14. The power supply unit 46 is located below the hydraulic oil tank 30 and is supported by a tank support base 150 that supports the hydraulic oil tank 30.

[0111] The tank support base 150 forms a space 159 on the back side of the support surface 151 that supports the hydraulic oil tank 30, and the power supply unit 46 is provided supported on the back side of the support surface 151 of the tank support base 150. In other words, in this embodiment, the power supply unit 46 is an example of a second electrical device provided supported on the back side of the support surface 151.

[0112] The power supply unit 46 has a roughly rectangular, thick plate-like outer shape, with its plate surface oriented horizontally and supported in a position parallel to the support surface 151, along the lower surface 151b, which is the back surface of the support surface 151. The power supply unit 46 is approximately the same size as the support surface 151, which has a roughly rectangular shape in plan view, and is provided in a state where its roughly rectangular plan view outer shape matches the plan view outer shape of the support surface 151. The front and rear edges of the power supply unit 46 protrude beyond the front and rear end faces 151c and 151d of the support surface 151 (see Figure 12).

[0113] The power supply unit 46 is supported on both its front and rear sides by support plates 200 (200A, 200B) against the support surface 151. The support plates 200 are vibration-damped and supported against the support surface 151, and the power supply unit 46 is vibration-damped and supported against the support surface 151 via the support plates 200. The support portion by the front support plate 200A and the support portion by the rear support plate 200B are configured substantially symmetrically front to back and have similar support structures.

[0114] The support plate 200 is composed of a plate-shaped member that has been bent into a predetermined shape. The support plate 200 is a longitudinal support member having a substantially crank-shaped cross-section, and is provided with its longitudinal direction aligned with the front or rear edge of the support surface 151, and is fixed to the support surface 151 and the power supply 46, respectively.

[0115] The support plate 200 has a surface portion having a roughly crank-shaped cross-section, comprising a water supply surface portion 201, a vertical surface portion 202, and a sewer surface portion 203. The water supply surface portion 201 and the sewer surface portion 203 are horizontal surfaces parallel to each other, and the front edge of the water supply surface portion 201 and the rear edge of the sewer surface portion 203 are connected by the vertical surface portion 202.

[0116] The support plate 200 is supported by vibration-damping rubber 210, which is a vibration-damping member, with its upper horizontal surface portion 201 overlapping the upper edges of the front and rear edges of the support surface portion 151. The support portions of the vibration-damping rubber 210 are provided at two locations near both ends in the longitudinal direction of each of the front and rear support plates 200.

[0117] The vibration-damping rubber 210 is made of an elastic material such as natural rubber or nitrile rubber. As shown in Figure 11, the vibration-damping rubber 210 has a rotating body shape centered on a predetermined central axis and has a hole 210a that penetrates the central axis. The vibration-damping rubber 210 also has an outer circumferential groove 210b in the axial middle section. In Figure 11, the support portion by the vibration-damping rubber 210 enclosed by the dashed line is shown as a partially cross-sectional view, and is enlarged.

[0118] The vibration-damping rubber 210 is interposed between the support surface 151 and the upper horizontal surface 201 of the support plate 200. The vibration-damping rubber 210 is attached to the upper horizontal surface 201 in a penetrating manner, with the inner peripheral edge of the circular through-hole 201a formed in the upper horizontal surface 201 fitted into the outer peripheral groove 210b. The portion of the vibration-damping rubber 210 above the outer peripheral groove 210b protrudes above the upper surface of the upper horizontal surface 201, and the portion below the outer peripheral groove 210b protrudes below the lower surface of the upper horizontal surface 201.

[0119] A grommet 211 is interposed between the vibration-damping rubber 210 and the support surface 151. The grommet 211 has a cylindrical portion and a flange formed on the lower end of the cylindrical portion. The cylindrical portion is inserted into the hole 210a of the vibration-damping rubber 210, and the flange is sandwiched between the lower surface of the vibration-damping rubber 210 and the support surface 151a of the support surface 151. In other words, the portion of the vibration-damping rubber 210 below the outer circumferential groove 210b is sandwiched between the lower surface of the upper horizontal surface 201 and the upper surface of the flange of the grommet 211.

[0120] A mounting bolt 212 is inserted from above into the cylindrical portion of a grommet 211, which is fitted into the hole 210a of the vibration-damping rubber 210. The mounting bolt 212 passes through the vibration-damping rubber 210, the grommet 211, and the hole 151e formed in the support surface portion 151, and is screwed into a nut portion 213 provided on the lower surface 151b of the support surface portion 151. A washer 214 is interposed between the head of the mounting bolt 212 and the vibration-damping rubber 210. In this way, the support portion of the support plate 200 by the vibration-damping rubber 210 to the support surface portion 151 is fastened and supported to the support surface portion 151 by the mounting bolt 212.

[0121] The power supply unit 46 is fixedly supported by front and rear support plates 200, which are elastically supported on the support surface 151. The front support plate 200A covers most of the front end face 151c of the support surface 151 from the front, and positions the sewer surface 203 below and in front of the support surface 151. The rear support plate 200B covers most of the rear end face 151d of the support surface 151 from the rear, and positions the sewer surface 203 below and in rear of the support surface 151.

[0122] In the power supply unit 46, the sewage flat portion 203 of the support plate 200 is fastened and fixed from above by fixing bolts 215 to the portion that protrudes from the support surface portion 151 in a plan view. In the casing of the power supply unit 46, boss portions 46a with screw holes that open upward are provided at the front and rear ends to serve as portions into which the fixing bolts 215 are screwed.

[0123] The fixing points using fixing bolts 215 are provided at three locations near both ends and in the middle of the longitudinal direction of the sewer surface 203. A cylindrical spacer 216 is interposed between the sewer surface 203 and the open end face of the boss portion 46a. The fixing bolts 215 are screwed into the boss portion 46a from above, passing through the sewer surface 203 and the spacer 216.

[0124] As described above, the power supply unit 46 is positioned below the support surface 151 of the tank support base 150, with vibration isolation support units 220 using vibration-damping rubber 210 at a total of four points (two at the front and two at the rear) relative to the support surface 151 via the front and rear support plates 200. Most of the right side of the power supply unit 46 is covered by the outer surface 152 of the tank support base 150, and most of the left side of the power supply unit 46 is covered by the inner surface 154 of the tank support base 150.

[0125] As described above, the power supply unit 46, which is vibration-damped and supported at four points, is installed at a position spaced apart from the lower surface 151b of the support surface 151 of the tank support base 150. The power supply unit 46, which has a roughly rectangular thick plate shape, has a flat upper surface 46b and is supported below the support surface 151 in a position parallel to the support surface 151. Furthermore, the power supply unit 46 is installed with a gap between it and the support surface 151.

[0126] In other words, there is a gap 225 of dimension S2 between the upper surface 46b of the power supply 46 and the lower surface 151b of the support surface 151 (see Figure 11). The gap 225 is the space between the lower surface 151b of the support surface 151 and the upper surface 46b of the power supply 46, both of which are horizontal surfaces and are opposed to each other in the vertical direction.

[0127] Thus, the power supply unit 46 is supported between it and the support surface portion 151 of the tank support base 150, with a gap 225 in between. The size of the dimension S2 of the gap 225 is adjusted, for example, by the vertical dimension of the vertical surface portion 202 of the support plate 200.

[0128] Furthermore, in the space 159 below the tank support base 150, a converter 230 is provided below the power supply unit 46. In other words, the excavation work machine 1 is equipped with a converter 230 as a third electrical device installed below the power supply unit 46, which is a second electrical device.

[0129] The converter 230 is a DC / DC converter that controls the voltage of DC power to convert DC power to DC power, and has functions for voltage conversion and stabilization. The converter 230 exchanges signals with the control unit of the power supply unit 46 and the inverter device 48 to indirectly control the power sent to the electric motor 12.

[0130] In this embodiment, the converter 230 receives DC power supplied from the power supply unit 46 or the battery unit 47, and steps down the voltage of this DC power to generate a low voltage. The DC power converted by the converter 230 is input to the inverter device 48, and the AC power controlled by the inverter device 48 is supplied to the electric motor 12. The converter 230 may also have a function to supply power from the power supply unit 46 to a low-voltage battery that supplies power to the integrated control unit of the excavation work machine 1.

[0131] The arrangement and mounting structure of the converter 230 will be explained using Figures 11 to 14. The converter 230 is installed on the base plate portion 80 below the power supply 46.

[0132] The converter 230 has a roughly rectangular parallelepiped shape and is installed with its longitudinal direction facing front to back. The converter 230 has a plan view shape smaller than that of the power supply 46 and is positioned so that the entire converter 230 is covered from above by the power supply 46. Furthermore, the right side of the converter 230 is almost entirely covered by the outer surface 152 of the tank support base 150, and the front upper part of the left side of the converter 230 is covered by the inner surface 154 of the tank support base 150 (see Figure 13).

[0133] The converter 230 is supported on the base plate portion 80 via a support plate 240. The support plate 240 is vibration-isolated and supported relative to the base plate portion 80, and the converter 230 is vibration-isolated and supported relative to the base plate portion 80 via the support plate 240.

[0134] The support plate 240 is made of a plate-shaped member bent into a predetermined shape, and forms a platform-shaped portion on the base plate portion 80. The support plate 240 has a horizontal device mounting surface portion 241 on which the converter 230 is attached as its base, and on both the front and rear sides of the device mounting surface portion 241, there are vertical surface portions 242 and lower support surface portions 243 which, together with the device mounting surface portion 241, have a roughly crank-shaped cross-section.

[0135] The device mounting surface portion 241 is a rectangular plate-shaped portion having approximately the same size as the external dimensions of the converter 230, corresponding to the approximately rectangular external dimensions of the converter 230 in a plan view. The converter 230 is fixed to the device mounting surface portion 241 by fixing bolts 245 at its four corners, covering approximately the entire upper surface 241a of the device mounting surface portion 241. The fixing bolts 245 pass through the flange portions 230a formed at the four corners of the casing of the converter 230 and the device mounting surface portion 241, and are screwed into nut portions 246 provided on the lower surface 241b of the device mounting surface portion 241.

[0136] The lower support surface 243 is a horizontal surface parallel to the device mounting surface 241, and the front or rear edge of the device mounting surface 241 and the rear or front edge of the lower support surface 243 are connected by a vertical surface 242. The support base plate 240 is configured to be approximately symmetrical front to back and has a flattened, approximately hat-like shape in side view (see Figure 13).

[0137] The support plate 240 is supported by vibration-damping rubber 210 with its front and rear lower support surfaces 243 overlapping the base plate 80 from above. The vibration-damping rubber 210 provides support at two locations near both ends in the longitudinal direction of each of the front and rear lower support surfaces 243.

[0138] In the support portion of the support plate 240, the vibration-damping rubber 210 is interposed between the lower support surface portion 243 and the base plate portion 80. The vibration-damping rubber 210 is attached to the lower support surface portion 243 with the inner peripheral edge of the circular through hole formed in the lower support surface portion 243 fitted into the outer peripheral groove 210b. The portion of the vibration-damping rubber 210 above the outer peripheral groove 210b protrudes above the upper surface of the lower support surface portion 243, and the portion below the outer peripheral groove 210b protrudes below the lower surface of the lower support surface portion 243.

[0139] A grommet 211 is interposed between the vibration-damping rubber 210 and the base plate portion 80, with its cylindrical portion inserted into the hole 210a of the vibration-damping rubber 210. The flange portion of the grommet 211 is sandwiched between the lower surface of the vibration-damping rubber 210 and the upper surface 80a of the base plate portion 80. In other words, the portion of the vibration-damping rubber 210 below the outer circumferential groove 210b is sandwiched between the lower surface of the lower support surface portion 243 and the upper surface of the flange portion of the grommet 211.

[0140] A mounting bolt 247 is inserted from above into the cylindrical portion of the grommet 211, which is fitted into the hole 210a of the vibration-damping rubber 210. The mounting bolt 247 passes through the vibration-damping rubber 210 and the grommet 211 and is screwed into the base plate portion 80, etc. A washer 248 is interposed between the head of the mounting bolt 247 and the vibration-damping rubber 210. In this way, the support portion of the support base plate 240 by the vibration-damping rubber 210 to the base plate portion 80 is fastened and supported to the base plate portion 80 by the mounting bolt 247.

[0141] As described above, the converter 230 is vibration-damped and supported by vibration-damping support parts 250 using vibration-damping rubber 210 at a total of four locations on the base plate portion 80, two on the front and two on the rear, via the support plate 240. In this supported state, the converter 230 is located below the support surface portion 151 of the tank support base 150 and on the base plate portion 80.

[0142] As described above, the converter 230, which is vibration-damped and supported at four points, is positioned at a distance from the upper surface 80a of the base plate portion 80. In this embodiment, the converter 230 has a support plate 240 interposed between it and the base plate portion 80, and the device mounting surface portion 241 is spaced apart from the upper surface 80a of the base plate portion 80.

[0143] The device mounting surface 241 is a surface parallel to the upper surface 80a of the base plate 80. The support plate 240 is provided with a gap between the device mounting surface 241 and the upper surface 80a of the base plate 80. In other words, there is a gap 249 between the lower surface 241b of the device mounting surface 241 and the upper surface 80a of the base plate 80. The gap 249 is a space between the lower surface 241b and the upper surface 80a, both of which are horizontal surfaces and are opposed to each other in the vertical direction.

[0144] Thus, the converter 230 has the device mounting surface 241 interposed between it and the upper surface 80a of the base plate 80 via a gap 249. The size of the gap 229 is adjusted, for example, by the vertical dimension of the vertical surface 242 of the support plate 240. Note that the presence or absence of a gap between the device mounting surface 241 and the converter 230 is not limited.

[0145] According to the excavation work machine 1 of this embodiment, which has the above configuration, a configuration equipped with electrical equipment such as an inverter device 48 that controls the electric motor 12 can be made highly flexible in terms of the layout of the electrical equipment, and the electrical equipment can be efficiently arranged in a limited space.

[0146] In this embodiment, the inverter device 48 is positioned at a distance from the left side portion 30a relative to the hydraulic oil tank 30 provided on the slewing frame 7. With this configuration, the inverter device 48 can be placed in a narrow space within the outer cover portion of the upper slewing body 20B, allowing the remaining space within the outer cover portion to be used for other equipment. This improves the degree of design flexibility. In other words, the space within the outer cover portion can be used effectively, improving the freedom of layout for equipment installed within the outer cover portion, thus enabling optimal design according to the type of construction machinery, etc.

[0147] Furthermore, the inverter device 48 is positioned with a gap 196 between it and the left side surface 30a of the hydraulic oil tank 30. With this configuration, it is possible to suppress the influence of the heat of the hydraulic oil in the hydraulic oil tank 30 on the inverter device 48, and the space near the hydraulic oil tank 30 can be used effectively. In other words, since the hydraulic oil in the hydraulic oil tank 30 is hotter than the outside air, it is inherently difficult to place precision electrical equipment around the hydraulic oil tank 30, which is the source of heat. However, the gap 196, which is an air layer, acts as an insulating layer, suppressing the direct transfer of heat from the hydraulic oil tank 30 to the inverter device 48.

[0148] Conversely, the presence of the gap 196 prevents the heat generated by the inverter device 48 during operation from affecting the hydraulic fluid in the hydraulic fluid tank 30, thereby maintaining a good hydraulic fluid temperature. In this way, providing the gap 196 suppresses heat transfer between the hydraulic fluid tank 30 and the inverter device 48. In particular, in this embodiment, since the support plate portion 171 of the mounting support frame 170 is interposed between the hydraulic fluid tank 30 and the inverter device 48, heat transfer between the hydraulic fluid tank 30 and the inverter device 48 can be effectively suppressed.

[0149] Furthermore, by employing an inverter device 48 as electrical equipment to be placed to the side of the hydraulic oil tank 30, the inverter device 48, which has a relatively flat external shape, can be positioned vertically, thereby making effective use of the space to the side of the hydraulic oil tank 30.

[0150] Furthermore, the inverter device 48 is installed while being supported on the tank support base 150. With this configuration, the inverter device 48 can be indirectly supported with respect to the base plate portion 80 by utilizing the existing configuration, so that vibrations of the slewing frame 7 do not directly affect the inverter device 48, and the inverter device 48 can be installed safely. In particular, since the inverter device 48 is supported by four vibration-damping support portions 190 via the mounting support frame 170, vibrations of the machine body do not affect the inverter device 48, which can be effectively suppressed.

[0151] Furthermore, the inverter device 48 is provided between the opening 198 formed at the front end of the upper rotating body 20B, which is located in front of and below the hydraulic oil tank 30 in the outer cover section, and the electric fan 62. With this configuration, when the electric fan 62 is operated, outside air can be drawn into the outer cover section, such as the storage space 197 for the hydraulic oil tank 30 and the space inside the driver's seat support base 14, thereby maintaining an appropriate ambient temperature inside the outer cover section.

[0152] Specifically, as shown in Figure 10, outside air is drawn into the outer cover section through the opening 198 by the suction action of the electric fan 62 (see arrow A1). The air drawn into the outer cover section forms a flow that passes over the tank support base 150 and moves towards the rear, passing through the radiator 61 and being discharged outside the outer cover section. Outside air is also drawn into the outer cover section through the opening 80b formed in the base plate section 80.

[0153] In this way, the air taken in through the opening 198, etc., passes through the gap 196, etc., between the hydraulic oil tank 30 and the inverter device 48, forming a smooth flow without stagnating around the inverter device 48. This prevents the temperature inside the outer cover from rising excessively, making it possible to maintain good operating conditions for the electrical equipment.

[0154] In the case where the electric fan 62 is installed on the outside (right side) of the radiator 61, the airflow will be reversed compared to this embodiment. That is, outside air will be drawn in from the rear of the unit into the space inside the outer cover by the electric fan 62 and discharged from the opening 198 on the front of the unit. Even with this configuration, it is possible to suppress an excessive rise in temperature inside the outer cover and maintain an appropriate ambient temperature inside.

[0155] Furthermore, in this embodiment, the hydraulic oil tank 30 is positioned in front of the electric fan 62 located on the right edge of the upper slewing body 20B, the electric motor 12 is positioned at the rear of the upper slewing body 20B, and an inner cover 199 covering the inverter device 48 is provided between the floor 8 and the right cover 31. With this configuration, even in configurations where the internal space of the outer cover is narrow and it is difficult to form an efficient airflow path, such as a relatively small rear-swing type excavator like the excavating machine 1, an airflow path can be easily formed around the inverter device 48 without being obstructed by other equipment. This makes it possible to maintain an appropriate ambient temperature in the internal space of the outer cover.

[0156] Furthermore, the excavation work machine 1 utilizes the space on the back (underside) of the support surface 151 of the tank support base 150 as a first installation area for electrical equipment, and is equipped with a power supply 46 as electrical equipment installed in the first installation area. With this configuration, the space inside the outer cover can be effectively utilized, and the degree of freedom in the layout of equipment installed inside the outer cover can be improved, allowing for an optimal design according to the type of construction machine, etc.

[0157] Furthermore, the excavation work machine 1 is equipped with a second installation section in the space 159 below the tank support base 150, which is an installation section for the converter 230 located below the first installation section. With this configuration, it becomes possible to utilize the space inside the outer cover more effectively, and the flexibility of the layout of other equipment can be improved.

[0158] Furthermore, the power supply unit 46 is positioned with a gap 225 between it and the support surface 151 on which the hydraulic oil tank 30 is placed. With this configuration, it is possible to suppress the influence of heat from the hydraulic oil in the hydraulic oil tank 30 on the power supply unit 46. In other words, the gap 225, which is an air layer, acts as an insulating layer, suppressing the transfer of heat from the hydraulic oil tank 30 to the power supply unit 46.

[0159] Conversely, the presence of the gap 225 prevents the heat generated by the power supply 46 during operation from affecting the hydraulic oil in the hydraulic oil tank 30, thus maintaining a good hydraulic oil temperature. In this way, providing the gap 225 suppresses heat transfer between the hydraulic oil tank 30 and the power supply 46. Furthermore, the gap 225 and the space 159 below the tank support base 150 serve as passages for air taken in from the opening 198, thus preventing heat from accumulating around the power supply 46.

[0160] Furthermore, since the converter 230 is installed below the power supply unit 46, it is positioned further away from the hydraulic oil tank 30 than the power supply unit 46, thus suppressing the thermal impact on the hydraulic oil tank 30. In addition, the gap 249 below the converter 230 and the space 159 below the tank support base 150 serve as passages for air taken in from the opening 198, thus suppressing heat buildup around the converter 230.

[0161] Furthermore, the power supply unit 46 is vibration-isolated and supported by four vibration-damping support parts 220 relative to the tank support base 150. With this configuration, it is possible to suppress the vibration of the slewing frame 7 from directly affecting the inverter device 48, and to safely install the power supply unit 46. In addition, the converter 230 is vibration-isolated and supported by four vibration-damping support parts 250 relative to the base plate 80. This suppresses the vibration of the slewing frame 7 from affecting the converter 230.

[0162] According to the layout configuration of the inverter device 48, power supply 46, and converter 230 of this embodiment, for example, in relation to an engine-powered machine equipped with an engine instead of an electric motor 12 as a drive source, it is possible to use the existing configuration of the upper slewing body of an engine-powered machine as is or with minor modifications, without changing the frame structure of the slewing frame 7 or the layout of other equipment on the slewing frame 7. In other words, the basic configuration of the upper slewing body can be shared between an electric configuration equipped with an electric motor 12 and an engine-powered machine. This makes it possible to reduce costs.

[0163] The hydraulic oil tank 30 and the drain structure of the hydraulic oil tank 30 provided in the excavation work machine 1 according to this embodiment will be explained with reference to Figures 6 and 15 to 17.

[0164] For example, in construction machinery such as an excavator, a hydraulic oil tank is provided to contain the hydraulic fluid supplied to hydraulic actuators such as hydraulic cylinders that make up the excavation device. The hydraulic fluid in the hydraulic oil tank is supplied to the hydraulic actuators via a hydraulic pump, control valve, etc.

[0165] For example, Japanese Patent Publication No. 3952994 discloses a configuration in which, in the upper rotating body of a construction machine, a drain pipe is branched off from a return pipe, such as a hose, located below the hydraulic oil tank, and an opening / closing mechanism is provided at the outlet of the drain pipe. When the outlet of the drain pipe is opened by the opening / closing mechanism, the hydraulic oil in the hydraulic oil tank can be discharged through the return pipe. With such a configuration, the hydraulic oil in the hydraulic oil tank can be guided through the return pipe to the outlet of the drain pipe and discharged through the drain pipe.

[0166] However, with the above configuration, the return piping and drain pipes are arranged on the central side of the upper rotating body of the aircraft, which results in a complex piping configuration and a cumbersome draining operation (waste oil operation).

[0167] Therefore, the excavation machine 1 according to this embodiment provides a configuration that simplifies the piping structure of the hydraulic oil tank 30 and improves the workability of the draining operation.

[0168] As shown in Figures 15 and 16, in the hydraulic oil tank 30, a suction pipe 261 is connected to the lower part of the right rear inclined surface 30e via a suction flange 260. The suction flange 260 has a substantially rectangular flange portion 263 whose four corners are fixed to the tank body portion 130 by bolts 262, and a connecting pipe portion 264 protruding from the flange portion 263. One end of the suction pipe 261 is connected to the connecting pipe portion 264.

[0169] One end of the suction pipe 261 is secured to the connecting pipe section 264 by a hose belt 265, with the connecting pipe section 264 inserted into it. The suction pipe 261 extends diagonally downward and rearward from the suction flange 260 to the left, and the rear edge of the base plate section 80 extends to the left, connecting to the hydraulic pump 41 located to the left of the electric motor 12.

[0170] As shown in Figures 6 and 15, the hydraulic oil tank 30 is installed on a tank support base 150 located on the right front edge of the base plate portion 80 of the slewing frame 7. The hydraulic oil tank 30 has a drain port 270.

[0171] The drain port 270 consists of a mounting opening 275 provided on the bottom surface 30h of the hydraulic oil tank 30 and a connector 276 attached to the mounting opening 275. The mounting opening 275 is formed as a circular hole penetrating the bottom surface 30h, which is made of a plate-like member and forms the storage space of the hydraulic oil tank 30. The mounting opening 275 is the part that opens the storage space of the hydraulic oil tank 30 facing downwards.

[0172] The connector 276 is made of a cylindrical metal member with a through hole formed by its inner circumferential surface, and is fixed to the lower surface 30k of the bottom surface 30h by welding or the like. The connector 276 is provided with a through hole that serves as a flow path for hydraulic fluid, which communicates with the mounting opening 275. The inner diameter of the flow path of the connector 276 is approximately the same as the hole diameter of the mounting opening 275, and the outer diameter of the connector 276 is larger than the hole diameter of the mounting opening 275.

[0173] The drain port 270 is located on the outer edge of the hydraulic oil tank 30 and protrudes from the underside of the bottom surface 30h. In plan view, the bottom surface 30h has a roughly pentagonal shape formed by the edges along the left side surface 30a, front surface 30b, right front inclined surface 30c, right rear inclined surface 30e, and rear surface 30d of the tank body 130 (see Figures 8 and 15). The bottom surface 30h also has edges that protrude slightly in a flange-like manner, corresponding to the front surface 30b, right front inclined surface 30c, right rear inclined surface 30e, and rear surface 30d.

[0174] The drain port 270 is located on the lower side of the bottom surface 30h of the hydraulic oil tank 30, below the corner 271 formed by the edge corresponding to the right front inclined surface 30c and the edge corresponding to the right rear inclined surface 30e. In other words, the drain port 270 is located below the lower end of the ridge 30j formed by the right front inclined surface 30c and the right rear inclined surface 30e.

[0175] The hydraulic oil tank 30 has a protruding edge 272 on the right edge of its bottom surface 30h that projects in an overhang shape from the support surface 151 of the tank support base 150 to the outer surface 152. As shown in Figure 15, the protruding edge 272 is the portion of the bottom surface 30h that extends beyond the outer surface 152a of the outer surface 152 to the outer circumference side (right side in Figure 15) of the base plate portion 80. In Figure 15, the dimension of the portion of the bottom surface 30h that extends beyond the outer surface 152a of the outer surface 152 is indicated by dimension B1. In addition, the portion of the side surface of the tank body portion 130 that extends beyond the outer surface 152a of the outer surface 152 includes the lower part of the corner that forms the ridge 30j.

[0176] Thus, the hydraulic oil tank 30 has a portion of the base plate portion 80 of the tank body portion 130 that protrudes from the outer edge of the tank support base 150. The area where the drain port 270 is located is included in the outer protruding edge portion 272 of the bottom surface portion 30h, which is the outer edge of the hydraulic oil tank 30. In other words, the drain port 270 is located between the outer edge of the protruding edge portion 272, which is the outer edge of the hydraulic oil tank 30, and the outer surface portion 152, which is the outer edge of the tank support base 150.

[0177] Furthermore, the hydraulic oil tank 30 has the right edge of its bottom surface 30h protruding outward relative to the outer edge of the base plate portion 80. As shown in Figures 15 and 16, the base plate portion 80 has its outer surface 80c, which forms its outer edge, positioned on the outer side (right side in Figure 15) relative to the outer surface 152 of the tank support base 150.

[0178] Furthermore, the protruding edge 272 of the bottom surface 30h of the tank body 130 extends outward from the outer surface 80c of the base plate 80. In Figure 15, the dimension of the portion of the bottom surface 30h that extends outward from the outer surface 80c of the base plate 80 is shown as dimension B2. In this way, the hydraulic oil tank 30 has a portion of the tank body 130 that protrudes outward from the outer edge of the base plate 80.

[0179] As shown in Figure 6, the tank body 130 of the hydraulic oil tank 30 has a trapezoidal shape in a front view, formed by the left side portion 30a, the bottom portion 30h, the ridge portion 30j, and the rear upper portion 30f. The left side portion 30a, located on the inside of the left and right sides of the tank body 130, is a vertical surface and forms a right angle with the bottom portion 30h in a front view. The ridge portion 30j of the tank body 130 slopes from the top to the bottom, from the inside on both sides to the outside, and forms an acute angle with the bottom portion 30h in a front view.

[0180] As shown in Figure 6, the tank body 130, which has a trapezoidal shape when viewed from the front, has different widths in the left-right direction for the rear upper surface 30f (width X1) and the bottom surface 30h (width X2). The left and right inner edges (right side in Figure 6) of the rear upper surface 30f and the bottom surface 30h are positioned approximately the same in the left-right direction. On the other hand, the left and right outer edges (left side in Figure 6) of these surfaces are positioned further outward for the bottom surface 30h than for the rear upper surface 30f. As a result, the width X2 of the bottom surface 30h is longer than the width X1 of the rear upper surface 30f.

[0181] Thus, the tank body 130 has a left-right width dimension that differs from that of the upper end surface formed by the rear upper surface 30f and the lower end surface formed by the bottom surface 30h. The tank body 130 has a lower end surface width dimension that is longer than that of the upper end surface due to the inclination of its left and right outer side surfaces. As shown in Figure 15, a drain port 270 is provided on the lower side of the lower end surface of the tank body 130, below the portion that protrudes outward to the left and right from the upper end surface.

[0182] Furthermore, in the hydraulic oil tank 30, the upper surface of the bottom surface portion 30h, which forms the bottom surface of the hydraulic oil storage space, can be an inclined surface that slopes downward from the left and right inner sides to the left and right outer sides. Specifically, as shown in Figure 15, the bottom surface 278 of the storage space, which is the upper surface of the bottom surface portion 30h, becomes an inclined surface that gradually slopes downward from the left and right inner sides to the left and right outer sides. Here, regarding the inclination of the bottom surface 278, the left and right inner sides are the pivot center side of the base plate portion 80 that follows the circular outer shape, and the left and right outer sides are the radially outer sides of the base plate portion 80.

[0183] In this configuration, where the bottom surface 278 of the hydraulic oil tank 30 is an inclined surface, the bottom portion 30h formed by the plate-shaped member becomes an inclined surface that is inclined as a whole along the inclination of the bottom surface 278. In this way, the bottom surface 278 of the hydraulic oil tank 30 can be inclined downward toward the outer edge of the base plate portion 80.

[0184] The base end of the drain hose 280 is connected to the drain port 270. The base end of the drain hose 280 is connected to the drain port 270 via an upper pipe fitting 281.

[0185] The upper pipe fitting 281 is a straight, tubular member having a nut-shaped portion in the middle. The upper pipe fitting 281 is attached to the connector 276 forming the drain port 270 with its upper end inserted into the connector 276 from below. The upper pipe fitting 281 is fixed to the connector 276 by screwing or press-fitting. The upper open end face of the upper pipe fitting 281 is positioned directly below the mounting opening 275.

[0186] The upper pipe fitting 281 is attached to the drain hose 280 with its other end, the lower portion, inserted into the base end of the drain hose 280. The base end of the drain hose 280 is secured to the upper pipe fitting 281 by a hose belt 282, with the lower portion of the upper pipe fitting 281 inserted into it.

[0187] The drain hose 280 extends downward from the drain port 270 and is fixed to the outer surface portion 152 that forms the side wall of the tank support base 150 via a drain socket 283. The drain socket 283 is made of a cylindrical metal member with a through hole formed by its inner circumferential surface. The drain socket 283 is attached to the lower edge of the outer surface portion 152, in the middle of the outer surface portion 152 in the width direction, via a fixing plate portion 284, with the through-hole, which serves as the flow path for the hydraulic fluid, oriented in the vertical direction. The drain socket 283 is positioned slightly forward of the drain port 270 in the front-rear direction.

[0188] The fixing plate portion 284 is provided by fixing a rectangular plate-shaped member to the cylindrical member forming the drain socket 283 by welding or the like. The fixing plate portion 284 is fixed to the outer surface of the drain socket 283 with its longitudinal direction oriented horizontally, and is fixed to the outer surface portion 152 by fixing bolts 285 that pass through both ends in the longitudinal direction. In this way, the drain socket 283, which receives the connection of the lower end of the drain hose 280, is fixed to the outer surface portion 152 of the tank support base 150 via the fixing plate portion 284.

[0189] The lower end of the drain hose 280 is connected to the drain socket 283. The lower end of the drain hose 280 is connected to the drain socket 283 via the lower pipe fitting 286.

[0190] The lower pipe fitting 286 is a straight, tubular member, and its upper end is attached to the drain hose 280 by being inserted into the lower end of the drain hose 280 from below. The lower end of the drain hose 280 is fixed to the lower pipe fitting 286 by a hose belt 287 or the like, with the upper part of the lower pipe fitting 286 inserted into it.

[0191] The lower pipe fitting 286 is attached to the drain socket 283 with its other end, the lower end, inserted into the drain socket 283 from above. The lower pipe fitting 286 is fixed to the drain socket 283 by screwing, press-fitting, or the like. The lower opening of the lower pipe fitting 286 is open within the hole of the drain socket 283.

[0192] With the connection configuration of the drain hose 280 described above, the drain hose 280 is arranged in a substantially vertical direction along the outer surface 152a of the outer surface 152, from the connector 276 located near the upper edge of the outer surface 152 to the drain socket 283, which is located slightly forward of the connector 276 and at the lower part of the outer surface 152.

[0193] A drain bolt 290 is attached to the lower opening of the drain socket 283. A threaded portion is formed on the inner circumferential surface of the hole in the drain socket 283, and the drain bolt 290 is screwed into the hole in the drain socket 283 from below. The lower opening of the drain socket 283 serves as the outlet for the hydraulic fluid. In the vertical direction, the lower opening end face of the drain socket 283 is positioned near the upper surface 80a of the base plate portion 80.

[0194] In the drain structure described above, draining is performed by removing the drain bolt 290 from the drain socket 283. The hydraulic fluid in the hydraulic fluid tank 30 flows by gravity from the drain port 270 through the upper pipe fitting 281, the drain hose 280, and the lower pipe fitting 286 into the hole of the drain socket 283, and then flows out downward from the hole of the drain socket 283. After draining, the drain bolt 290 is screwed into the drain socket 283, and the lower opening of the drain socket 283 is closed.

[0195] A notch 80d is formed on the outer peripheral edge of the base plate portion 80, below the drain socket 283. As shown in Figure 17, the notch 80d is a recess cut out in a substantially semicircular shape relative to the circumferential shape along which the outer peripheral surface 80c of the base plate portion 80 follows. Due to the notch 80d, the lower end of the drain bolt 290 is located below the upper surface 80a of the base plate portion 80 in the vertical direction.

[0196] As shown in Figure 17, the notch 80d has an arc shape that is approximately concentric with the drain socket 283 and drain bolt 290, which have a circumferential outer shape, when viewed from below. The radius of the arc shape that the notch 80d follows is approximately twice the radius of the circumferential shape that the outer shape of the drain socket 283 follows. When viewed from below, the drain socket 283 is positioned such that approximately one-third of its inner (lower) portion is located inside the arc shape that the outer circumferential surface 80c of the base plate portion 80 follows. In Figure 17, the arc shape that the outer circumferential surface 80c of the base plate portion 80 follows is shown by a dashed line.

[0197] As described above, the drain port 270, which forms a drain structure located below the outer edge of the hydraulic oil tank 30, is covered by a right cover portion 31, which forms the right side portion of the outer cover portion, as shown in Figures 9 and 15. The right cover portion 31 has an upper cover portion 31a that forms its upper surface and is curved downwards toward the front, a side cover portion 31b that forms the right side portion of the right cover portion 31, and a lower edge cover portion 31c that is located below the side cover portion 31b and forms the lower edge portion of the right cover portion 31 (see Figure 9).

[0198] The side cover portion 31b abuts its rear edge against the right edge of the rear cover portion 32 and the counterweight 142, respectively (see Figure 15). The lower edge cover portion 31c has a substantially constant length in the vertical direction and is a cover portion that curves along the arc shape of the base plate portion 80.

[0199] The drain port 270 is covered by the side cover portion 31b of the right cover portion 31. Also, most of the drain hose 280, located below the drain port 270, except for the lower end, is covered by the side cover portion 31b. Furthermore, the lower end of the drain hose 280, the drain socket 283, and the drain bolt 290 are covered by the lower edge cover portion 31c of the right cover portion 31.

[0200] According to the drain structure of this embodiment described above, the piping configuration of the hydraulic oil tank 30 can be simplified, and the workability of the draining operation can be improved.

[0201] In this embodiment, the drain structure is provided with a drain port 270 on the outer edge of the hydraulic oil tank 30. With this configuration, the drain pipe can be routed along the outer periphery of the slewing frame 7, eliminating the need to route the drain pipe towards the pivot center of the upper slewing body 20B, thus simplifying the piping configuration.

[0202] Furthermore, the drain port 270 is composed of a mounting opening 275 formed in the bottom surface 30h of the hydraulic oil tank 30 and a connector 276 attached to the mounting opening 275. With this configuration, the drain port 270 can be made simple.

[0203] Furthermore, the hydraulic oil tank 30 is positioned on the tank support base 150, and a portion of the hydraulic oil tank 30 protrudes from the outer edge of the tank support base 150. With this configuration, the drain port 270 can be easily provided by utilizing the portion of the hydraulic oil tank 30 that protrudes from the tank support base 150.

[0204] Furthermore, the drain port 270 is provided between the outer edge of the hydraulic oil tank 30 and the outer edge of the tank support base 150. With this configuration, the space on the outer edge of the tank support base 150 can be effectively utilized.

[0205] Furthermore, the hydraulic oil tank 30 has a shape in which the dimensions of the lower surface are larger on the outer circumference than the dimensions of the upper surface of the tank body 130. With this configuration, the space below the hydraulic oil tank 30 can be effectively utilized by providing a drain port 270 on the underside of the lower surface that protrudes outward relative to the upper surface of the tank body 130.

[0206] Furthermore, the hydraulic oil tank 30 has a bottom surface 278 of the tank body 130 that slopes downward from the inside left and right to the outside left and right. With this configuration, the bottom surface 278 of the hydraulic oil tank 30 slopes downward toward the location of the drain port 270. This makes it easier to guide the hydraulic oil in the hydraulic oil tank 30 toward the drain port 270, allowing for efficient draining.

[0207] Furthermore, the drain hose 280 connected to the drain port 270 is fixed to the outside of the outer surface portion 152 of the tank support base 150 via a drain socket 283 or the like. With this configuration, the drain hose 280 can be positioned and supported with a simple structure by utilizing the space on the outer circumference of the tank support base 150.

[0208] Furthermore, the drain socket 283, which receives the connection of the drain hose 280 and the mounting of the drain bolt 290, is fixed to the outside of the outer surface portion 152 of the tank support base 150. With this configuration, the drain socket 283, which serves as the outlet for the hydraulic fluid, can be provided on the outer circumference of the tank support base 150, thus providing good access to the drain socket 283 and improving the workability of the draining operation.

[0209] Furthermore, the hydraulic oil tank 30 protrudes in part from the outer edge of the base plate portion 80 that supports the tank support stand 150. With this configuration, by providing the drain port 270 in the portion of the hydraulic oil tank 30 that protrudes from the base plate portion 80, the drain passage extending downward from the drain port 270 can be positioned at the outer edge of the base plate portion 80, thereby providing good access to the drain socket 283.

[0210] Furthermore, the base plate portion 80 has a notch 80d on its outer edge corresponding to the arrangement of the drain socket 283. With this configuration, interference between the drain socket 283 and the drain bolt 290 and the base plate portion 80 can be avoided, so the drain socket 283 can be prevented from protruding outwards, thus saving space. In addition, space can be secured for attaching and detaching the drain bolt 290 attached to the drain socket 283, making it easy to attach and detach the drain bolt 290.

[0211] Furthermore, the drain port 270 is covered by the right cover portion 31. With this configuration, the drain port 270 and the drain flow path structure such as the drain hose 280 connected to the drain port 270 can be protected by the right cover portion 31.

[0212] The above-described embodiments are merely examples of the present invention, and the construction machinery according to the present invention is not limited to the above-described embodiments. Therefore, even in embodiments other than those described above, various modifications are possible depending on the design, etc., as long as they do not depart from the technical spirit of the present invention. Furthermore, the effects described in this disclosure are merely illustrative and not limiting, and other effects may also exist.

[0213] In the embodiment described above, the electrical equipment (first electrical equipment) located to the side of the hydraulic oil tank 30 is an inverter device 48, the second electrical equipment located on the back side of the support surface portion 151 of the tank support base 150 is a power supply 46, and the third electrical equipment located below the power supply 46 is a converter 230. However, these electrical equipment and their placement positions are not particularly limited.

[0214] The arrangement of the inverter device 48, the power supply unit 46, and the converter 230 may be configured by appropriately swapping the positions of these electrical devices. Therefore, for the second and third electrical devices to be placed in the space 159 below the tank support base 150, any two of the inverter device 48, the power supply unit 46, and the converter 230 can be appropriately selected. In addition, electrical devices other than the inverter device 48, the power supply unit 46, and the converter 230 may be used as the first, second, and third electrical devices.

[0215] Furthermore, in the above-described embodiment, the excavation work machine 1 is an electric construction machine equipped with an electric motor 12 as the prime mover, but the construction machine according to the present invention may be an engine-powered machine equipped with an internal combustion engine as the prime mover.

[0216] Furthermore, the arrangement of the operating unit 10 in the upper rotating body 20B, as well as the arrangement of equipment such as the electric motor 12, hydraulic pump 41, hydraulic oil tank 30, radiator 61, and electric fan 62, may be a left-right inversion of the configuration of the embodiment described above. [Explanation of symbols]

[0217] 1. Excavation equipment (construction machinery) 7. Swivel frame (frame) 8 Floor 10. Driver's Unit 12. Electric motor (prime mover) 14. Driver's seat support base (seat mount) 15. Driver's seat 20B Upper rotating body (aircraft) 30 Hydraulic oil tank 30a Left side part 31 Right cover section 34 Front lower cover section 41 Hydraulic pump 43 Actuators 46. ​​Power supply equipment (electrical appliances) 47 Battery Unit 48. Inverter devices (electrical equipment) 62 Electric Fan (Fan) 80 Base plate section 150 Tank support stand (base) 151 Support surface part 152 External surface 159 Spatial part 196 gap 197 Containment Space 198 opening 199 Inner cover 225 gap 230 Converter (Electrical Equipment) 270 Drain port 280 Drain hose 283 Drain socket 290 Drain bolt

Claims

1. It is equipped with an electric motor that drives a hydraulic pump using power from a battery unit, a fan that generates airflow inside the aircraft, and a driver's seat. The electric motor is positioned below the fan and the driver's seat, and in a position that overlaps with the driver's seat in a plan view. Construction machinery.

2. The electric motor is located below the battery unit. The construction machine according to claim 1.

3. The electric motor is located to the side of the battery unit and below the hydraulic oil tank that contains the hydraulic oil supplied by the hydraulic pump. The construction machine according to claim 1 or claim 2.

4. The battery unit is equipped with electrical equipment located in front of it, The aforementioned electrical equipment is located below the fan. The construction machine according to claim 1 or claim 2.

5. On one side of the battery unit, the fan and the hydraulic oil tank are arranged side by side in the front-to-back direction. The construction machine according to claim 3.

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