Construction machine

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 equipped with electric equipment such as an inverter device that controls an electric motor. [Background technology]

[0002] 2. Description of the Related Art Conventionally, construction machines such as excavators and the like include electric types that are equipped with an electric motor as a drive source. Electric construction machines include electrical equipment such as an inverter device that controls the electric motor.

[0003] An example of an electric construction machine is an excavation machine that includes a lower traveling body and an upper rotating body that is mounted rotatably on the lower traveling body, and an electric motor is mounted on the upper rotating body. This type of construction machine requires a compact configuration from the viewpoint of reducing the turning radius of the upper rotating body, and therefore the layout of electrical equipment such as an inverter device is important.

[0004] Regarding the layout of electrical equipment in electric construction machinery, 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 storage battery in a hybrid excavator equipped with a generator motor driven by an engine as a drive source, a controller including an inverter, and a storage battery.

[0005] Specifically, in the hybrid excavator of Patent Document 1, a cabin is disposed on the left side of a rotating frame constituting an upper rotating body, and tanks for fuel and hydraulic oil are disposed on the right side of the rotating frame. A controller and a storage battery are housed in a stepped equipment case, which is disposed in front of the tanks. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2012-172332 A Summary of the Invention [Problem to be solved by the invention]

[0007] In the configuration disclosed in Patent Document 1, the equipment case in which the controller and other electrical equipment is stored is formed in a stepped shape, which places great restrictions on the placement of the electrical equipment. Also, in a configuration in which the equipment case storing the electrical equipment is installed in front of the tank, the position on the rotating frame is likely to be restricted.

[0008] In particular, when attempting to adopt the configuration disclosed in Patent Document 1 in a relatively small excavation machine, it becomes difficult to secure installation space for electrical equipment on the rotating frame, which can make it difficult to appropriately arrange the electrical equipment on the rotating frame.

[0009] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a construction machine that, in a configuration equipped with electrical equipment such as an inverter device that controls an electric motor, allows for a high degree of freedom in the layout of the equipment and enables the equipment to be arranged efficiently in a limited space. [Means for solving the problem]

[0010] The construction machine of the present invention comprises a prime mover, a hydraulic oil tank for storing 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 of the hydraulic oil tank relative to the hydraulic oil tank.

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

[0012] A construction machine according to another aspect of the present invention is the construction machine described above, wherein the electrical equipment is supported on a base that supports the hydraulic oil tank.

[0013] A construction machine according to another aspect of the present invention is a construction machine comprising a fan for taking in air into the storage space of the hydraulic oil tank, and the electrical equipment is provided between the fan and an opening formed in a lower front portion of the hydraulic oil tank of an exterior cover part that forms the storage space, connecting the storage space to the outside.

[0014] A construction machine according to another aspect of the present invention is a construction machine comprising a driver's section with a driver's seat installed on a seat mount provided on the rear side of a floor section, the fan is arranged on one of the left and right edge sections of the body, the hydraulic oil tank is arranged in front of the fan, the prime mover is arranged at the rear of the body, and a cover covering the electrical equipment is provided between the floor section and a cover section covering the hydraulic oil tank.

[0015] A construction machine according to another aspect of the present invention is a construction machine in which the base forms a space on the rear side of a support surface that supports the hydraulic oil tank, and is provided with a second electrical device that is supported on the rear side of the support surface.

[0016] A construction machine according to another aspect of the present invention is the construction machine, wherein the second electrical device is provided at a position spaced apart from the rear surface of the support surface portion.

[0017] A construction machine according to another aspect of the present invention is the above-mentioned construction machine further comprising a third electric device installed below the second electric device. Effect of the Invention

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

[0019] [Figure 1] 1 is a left side view of an excavation machine according to an embodiment of the present invention. FIG. [Diagram 2] 1 is a perspective view of an excavation work machine according to an embodiment of the present invention, seen from the left front. [Diagram 3] 1 is a block diagram showing a configuration of a device provided in an excavation machine according to an embodiment of the present invention. [Figure 4] 1 is a perspective view showing an example of an installation mode of a device configuration provided in an excavation machine according to an embodiment of the present invention. FIG. [Diagram 5] FIG. 2 is a left front perspective view showing an example of an installation mode of a device configuration provided in the excavation machine according to one embodiment of the present invention. [Figure 6] 4 is a front view showing a support structure for a hydraulic oil tank and an inverter device according to an embodiment of the present invention; FIG. [Figure 7] FIG. 2 is a perspective view showing a support structure for a hydraulic oil tank and an inverter device according to an embodiment of the present invention. [Figure 8] FIG. 2 is an exploded perspective view showing a support structure for an inverter device according to an embodiment of the present invention. [Figure 9] FIG. 2 is a front view showing a configuration of a portion of an upper rotating body according to an embodiment of the present invention. [Figure 10] FIG. 2 is a left side cross-sectional view showing a configuration of a portion of an upper rotating body according to an embodiment of the present invention. [Figure 11] FIG. 2 is a front view showing an arrangement of a power feeder and a converter according to an embodiment of the present invention. [Figure 12] FIG. 2 is a plan view showing an arrangement of a power feeder according to an embodiment of the present invention. [Figure 13] FIG. 2 is a side view showing an arrangement of a power feeder and a converter according to an embodiment of the present invention. [Figure 14]1 is a perspective view showing an arrangement of a power feeder and a converter according to an embodiment of the present invention; [Figure 15] FIG. 2 is a rear view showing the hydraulic oil tank and drain structure according to the embodiment of the present invention. [Figure 16] FIG. 2 is a bottom perspective view showing the hydraulic oil tank and drain structure according to one embodiment of the present invention. [Figure 17] FIG. 4 is a bottom view showing the drain structure of the hydraulic oil tank according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] The present invention aims to improve the freedom of layout of electric devices and to efficiently arrange the electric devices in a limited space by devising an arrangement configuration of the electric devices in a configuration including an inverter device that controls an electric motor. Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0021] In the embodiment of the present invention, an excavator (shovel) which is a slewing work vehicle will be described as an example of the construction machine according to the present invention. However, the construction machine according to the present invention is not limited to excavators, and can be widely applied to other construction machines such as bulldozers, crane work machines, compact track loaders, skid steer loaders, wheel loaders, etc.

[0022] The overall configuration of an excavation work machine 1 according to this embodiment will be described with reference to Figures 1 and 2. As shown in Figures 1 and 2, the excavation work machine 1 includes a traveling device 2 as a self-propelled traveling 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 part of the excavation machine 1 and has a pair of left and right crawler-type traveling units 5,5, a track frame 6 as a base supporting the left and right traveling units 5,5, and a swivel frame 7 provided on the track frame 6.

[0024] The running section 5 has a configuration in which a track is wound around rotating bodies such as multiple sprockets supported on predetermined frame parts constituting 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 center 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 rotating frame 7 is configured to be substantially circular in plan view, and is provided relative to the track frame 6 so as to be able to rotate in either the left or right direction about an axis in the up-down direction by means of a rotating support part 6c provided on the upper side of the track frame 6. The rotating frame 7 is also configured so as to be able to rotate within the left-right width of the left and right running parts 5, 5, that is, within the width between the left outer edge of the left running part 5 and the right edge of the right running part 5. This enables the excavation machine 1 to perform small turning operations.

[0026] A driving section 10 having a flat floor 8 is provided on the revolving frame 7. The floor 8 is provided on the left side of the front half of the revolving frame 7. A tank section 9 is provided on the right side of the driving section 10. The left side of the floor 8 serves as an entrance for an operator to get on and off the driving section 10. In addition, an electric motor 12, which is a prime mover, is provided at the rear of the revolving frame 7 as a drive source.

[0027] The driving unit 10 is for driving and operating the traveling device 2 and the excavation device 3. A canopy 13 is provided for the driving unit 10 on the revolving frame 7. The canopy 13 has a pair of left and right rear support pillars 13a, 13a erected above the prime mover unit, a pair of left and right front support pillars 13b, 13b erected at the front end of the floor unit 8, and a canopy roof portion 13c provided between the front and rear support pillars. The canopy roof portion 13c covers the driving 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 on the rear side of the floor 8, and a driver's seat 15 is provided on the driver's seat support base 14. A pair of left and right travel levers 16 are provided in front of the driver's seat 15, extending upward from the floor 8. A plurality of operation pedals 17 for work are disposed on both the left and right sides of the travel levers 16 on the floor 8. In the driver's unit 10, an operation panel unit having various operation units such as work operation levers for operating working units such as the excavation device 3, and switches is provided around the driver's seat 15.

[0029] The excavator 1 includes a lower traveling body 20A including a track frame 6 and traveling sections 5, 5 supported on both the left and right sides of the track frame 6, and an upper rotating body 20B as a machine body mounted so as to be rotatable relative to the lower traveling body 20A. The upper rotating body 20B includes a rotating frame 7 which is a frame constituting the machine body, and a driving section 10 provided on the rotating frame 7.

[0030] Furthermore, a hydraulic oil tank 30 that stores hydraulic oil is provided in the tank section 9 provided on the right side of the driving section 10 (see FIG. 4). The hydraulic oil tank 30 is provided at the front right side of the revolving frame 7. The hydraulic oil in the hydraulic oil tank 30 is supplied to hydraulic cylinders, etc. that constitute the excavation device 3 and hydraulic cylinders, etc. that the excavation work machine 1 is equipped with.

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

[0032] The excavation device 3 is a front working device provided in front of the traveling device 2. A support bracket 18 for supporting the excavation device 3 is provided protruding forward from the left-right central part of the front end of the revolving frame 7. A boom support bracket 19 forming the base end of the excavation device 3 is supported by the support bracket 18 so as to be rotatable with the vertical direction as the rotation axis direction. The excavation device 3 is provided so as to swing left and right relative to the revolving frame 7 by a swing hydraulic cylinder 20 (see FIG. 9) provided on the right side of the boom support bracket 19 between the boom support bracket 19 and the revolving frame 7.

[0033] The swing hydraulic cylinder 20 is provided between the boom support bracket 19 and the revolving frame 7. The swing hydraulic cylinder 20 has a rear bottom side pivotally supported on the base plate portion 80 of the revolving frame 7, and a front rod side pivotally supported on the boom support bracket 19.

[0034] The excavation device 3 has a boom 21 that has a boomerang-like bent shape in a side view and constitutes a base side portion of the excavation device 3, an arm 22 connected to the tip side 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, as a work attachment, is detachably connected to the tip of the arm 22 via an attachment attachment device 29. In the excavation device 3, other devices such as a grapple or a breaker are attached instead of the bucket 23 depending on the work to be performed.

[0036] In the excavation work machine 1 having the above-mentioned configuration, the desired motion and work are performed by an operator seated in the driver's seat 15 appropriately operating the travel lever 16, work operation levers, etc. Specifically, for example, operation of the travel lever 16 causes the traveling device 2 to travel forward and backward in a straight line or to turn left and right. Also, operation of the work operation lever causes the excavation device 3 to perform excavation work, etc.

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

[0038] The actuator 43 is a general term for various hydraulic actuators provided in the excavator 1. The actuator 43 is, for example, the boom cylinder 26, the arm cylinder 27, the implement cylinder 28, the swing hydraulic cylinder 20, the turning hydraulic cylinder, and the like.

[0039] The control valve 42 controls the flow of pressure oil to each hydraulic actuator as the actuator 43. The control valve 42 is configured to include a plurality of directional control valves corresponding to each hydraulic actuator, and controls the amount and destination of pressure oil supplied from the hydraulic oil tank 30 by driving the hydraulic pump 41, by controlling the operation of the directional control valves, etc. The operation of the excavation device 3 and the rotation operation of the upper rotating body 20B are performed by controlling the supply of pressure oil to the actuator 43.

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

[0041] The excavator 1 also has a pair of left and right traveling hydraulic motors 44, 44 (see Figs. 1 and 2). The traveling hydraulic motors 44 are driven by pressure oil supplied from a control valve 42, and are provided in each traveling section 5 so as to rotate and drive a drive sprocket 5a while being attached to a predetermined portion such as a side frame section 6b of the track frame 6. The left and right traveling hydraulic motors 44, 44 respectively drive the traveling sections 5, causing the traveling device 2 to travel forward and backward in a straight line and turn left and right.

[0042] As shown in FIG. 3, the excavation machine 1 includes a power supply device 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 which controls the electric motor 12, all of which are electrically connected directly or indirectly to the electric motor 12.

[0043] 3, power supply device 46 is electrically connected to commercial power supply 49, which is an external power source, via power supply line 51 for supplying external power. That is, power supply device 46 takes in power from commercial power supply 49, which is an external power source, via power supply line 51. Power supply line 51 is formed of a cable or the like. Power supply device 46 is also electrically connected to battery unit 47 and inverter device 48.

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

[0045] The excavation machine 1 has the following three power supply modes which can be switched by operating, for example, a mode selector switch provided on the driving unit 10. That is, the excavation machine 1 has a battery power supply mode in which power is supplied to the electric motor 12 only from the battery unit 47, an external power supply mode in which power is supplied to the electric motor 12 from an external commercial power source 49 by the power supply device 46, and a power storage mode in which power from the external commercial power source 49 is stored in the battery unit 47 by the power supply device 46.

[0046] The external power supply mode includes at least one of charging the battery unit 47 with power supplied from the commercial power source 49 via the power supply device 46 and supplying power 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, the electric motor 12 is driven by power supplied from the commercial power source 49 and, in some cases, receives power for driving from the battery unit 47.

[0047] The battery unit 47 is a power source provided in the excavator 1. The battery unit 47 is configured by unitizing a plurality of battery modules. The battery module is made up of secondary batteries such as lead-acid batteries and lithium-ion batteries. The battery unit 47 supplies a direct current to the inverter device 48.

[0048] 4 and 5, the battery unit 47 is disposed at a position above the electric motor 12 at the rear of the revolving frame 7. For convenience, the battery unit 47 is indicated by a two-dot chain line in FIG.

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

[0050] The battery unit 47 is supported on a base plate portion 80 constituting the revolving frame 7 via a predetermined support member. The base plate portion 80 is a portion forming the bottom surface of the revolving frame 7, and is composed of horizontally arranged plate-like frame members and the like. The base plate portion 80 has a flat upper surface 80a. A plurality of openings 80b are formed in the base plate portion 80.

[0051] A floor frame 89 for providing the floor 8 is provided from the left side to the 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. The front lower cover portion 34 is provided in a manner bridging the front edge of the base plate portion 80 and the front edge of the horizontal frame portion 89a.

[0052] A pair of left and right vertical plates 88 are provided on the base plate portion 80 so as to extend substantially along the front-rear direction from the rear side of the support bracket 18 provided in the left-right center portion of the front side of the revolving frame 7. The vertical plates 88 are fixed to the base plate portion 80 and form part of the revolving frame 7.

[0053] The right vertical plate 88 extends rearward to the rear end of the revolving frame 7, and defines the installation locations of the electric motor 12 and the radiator 61. The left vertical plate 88 extends rearward to the vicinity of the front side of the electric motor 12, and the control valve 42 is disposed on the left side 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, and form the left and right side portions of the support bracket 18.

[0054] 5, the battery unit 47 is supported on a base plate portion 80 of the revolving frame 7 by left and right lower vibration-proof supports 81 that provide vibration-proof support for the underside of the battery unit 47, and left and right upper vibration-proof supports 82 that provide vibration-proof support for the upper side of the battery unit 47. The lower vibration-proof supports 81 are provided at the front end of the battery unit 47, and the upper vibration-proof support 82 is provided at the rear end of the battery unit 47.

[0055] The lower vibration-proof support part 81 is provided on a gate-shaped support leg part 85 provided on the upper surface 80a of the base plate part 80. The upper vibration-proof support part 82 is provided on a gate-shaped frame part 110 configured in a substantially gate shape with respect to the base plate part 80. The gate-shaped frame part 110 is configured to include a pair of left and right stay parts 111 standing on the base plate part 80, and a horizontal frame part 112 installed between the left and right stay parts 111.

[0056] The electric motor 12 and hydraulic pump 41 are arranged horizontally in the space below the battery main 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-proof supported on the revolving frame 7 by a plurality of vibration-proof supports 140. In this embodiment, as shown in Fig. 4, the vibration-proof supports 140 are provided at a total of four locations: two locations on the left and right sides of the front side of the motor-pump unit and two locations on the left and right sides of the rear side of the motor-pump unit.

[0057] In the vibration-proof support part 140, the support stay extending from the motor-pump unit is supported by a predetermined support part provided on the base plate part 80 of the revolving frame 7. The vibration-proof support part 140 includes an elastic part formed from an elastic material such as rubber, and a fixing part for fixing the support stay extending from the motor-pump unit to the predetermined support part on the revolving 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 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 a commercial power source 49 via the power supply 46 to the electric motor 12 as a predetermined voltage.

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

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

[0061] As shown in Fig. 4, the excavator 1 also includes a radiator 61 as a cooling system for cooling the cooling water supplied to the electric motor 12, the inverter device 48, the power supply device 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 flow path. An electric fan 62 is provided for the radiator 61. A communication part through which air passes is formed in the radiator 61, and the cooling water is cooled when air passes through the communication part by being blown from the electric fan 62.

[0062] As shown in FIG. 4, the radiator 61 has a substantially rectangular thick plate-like shape and is erected on the right side of the rear of the revolving frame 7. The radiator 61 is disposed adjacent to the rear of the hydraulic oil tank 30. The radiator 61 is inclined in a direction in which the rear side is positioned on the left-right inner side with respect to the front-rear direction so as to follow the substantially circular outer shape of the revolving frame 7 in a plan view. The electric fan 62 is integrally provided on the inner side surface portion 61a of the radiator 61 so as to cover most of the side surface portion 61a. The electric fan 62 is driven by electric power supplied from the commercial power source 49 or the battery unit 47. The electric power supplied from the commercial power source 49 or the battery unit 47 is stepped down in voltage by a DC / DC converter (converter 230 described later) before being supplied to the electric fan 62 and the like.

[0063] The arrangement and mounting structure of the inverter device 48 will be described with reference to Figures 6 to 10. The inverter device 48 is provided on the inner lateral side (left side) of the hydraulic oil tank 30 provided at the front right side of the revolving frame 7, that is, on the rotation center side of the upper revolving body 20B. The inverter device 48 has a substantially rectangular thick plate-like outer shape with the plate surface direction being vertical and is provided along the left side surface portion 30a of the hydraulic oil tank 30 in a position parallel to the left side surface portion 30a.

[0064] The hydraulic oil tank 30 is placed on a tank support stand 150 serving as a seat provided on the base plate portion 80. The tank support stand 150 is provided on the base plate portion 80 in a fixed state.

[0065] The hydraulic oil tank 30 has a tank main body 130 that is a vertically elongated, generally rectangular parallelepiped shape, and is erected on a tank support stand 150. The tank main body 130 has a shape in which the left-right direction is the short side in a plan view and the front-rear direction is the long side, and in which the left-right direction is the short side and the up-down direction is the long side in a front view.

[0066] The tank main body 130 has, as vertical surface portions, a left side surface portion 30a along the front-rear direction, a front surface portion 30b along the left-right direction, a right front inclined surface portion 30c forming the front portion of the right side surface portion, a rear surface portion 30d which is the surface portion opposite to the front surface portion 30b, and a right rear inclined surface portion 30e which is the surface portion between the rear surface portion 30d and the right front inclined surface portion 30c and forms the rear portion of the right side surface portion (see FIG. 15). The right front inclined surface portion 30c of the tank main body 130 is inclined in a direction from the left-right outer side to the inside from the rear side to the front side, and the right rear inclined surface portion 30e is inclined in a direction from the left-right inner side to the outside from the rear side to the front side. The right side surface portion of the tank main body 130 has a bent shape with the right side being convex by the right front inclined surface portion 30c and the right rear inclined surface portion 30e so that it does not protrude from the arc-shaped outer shape along which the revolving frame 7 follows in a plan view.

[0067] The tank body 130 has a horizontal rear upper surface 30f and a front inclined surface 30g as an upper surface. The front inclined surface 30g is a downwardly inclined surface. The tank body 130 has a horizontal bottom surface 30h. A fuel filler port 125 is provided on the rear upper surface 30f.

[0068] The tank support stand 150 is composed of a plate-like 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 portion of the tank support stand 150, and has a substantially rectangular outer shape in a plan view. The upper surface of the support surface portion 151 becomes a support surface 151a that supports the hydraulic oil tank 30, etc. The tank support stand 150 is provided at an angle so that the front side faces inward to the left and right (left side) in accordance with the arc-shaped outer shape along which the swivel frame 7 follows in a plan view.

[0069] The outer surface portion 152 is a vertical surface portion bent downward from the right edge portion of the support surface portion 151. The lower fixing surface portion 153 is a horizontal surface portion bent inwardly to the left and right from the lower end portion of the outer surface portion 152. The inner surface portion 154 is a vertical surface portion bent downward from the left edge portion of the support surface portion 151. The lower fixing surface portion 153 is a narrower portion than the support surface portion 151, and the inner surface portion 154 has a shorter extension length downward from the support surface portion 151 than the outer surface portion 152.

[0070] As shown in Fig. 6, the tank support base 150 is fixed to the base plate portion 80 with the lower fixing surface portion 153 aligned along 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 portions at the front and rear (see Fig. 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 a nut portion 156 provided on the lower fixing surface portion 153. A hole portion 153a is formed in the lower fixing surface portion 153 to pass the fixing bolt 155 through (see Fig. 8).

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

[0072] In this way, the tank support stand 150 is fixed to both the base plate portion 80 and the vertical plate 88R and is provided in a manner of being bridged between them. The tank support stand 150 forms a space portion 159 that is open on both the front and rear sides on the base plate portion 80. On both the front and rear sides of the space portion 159, approximately rectangular openings are formed by the gate-shaped tank support stand 150, the horizontal base plate portion 80, and the vertical plate 88R provided vertically on the base plate portion 80.

[0073] The hydraulic oil tank 30 is fixed at multiple points to the support surface portion 151 of the tank support stand 150 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 main body portion 130, and the fixing plate portion 161 is fixed to the support surface portion 151 by the fixing bolts 160.

[0074] The fixing bolt 160 penetrates an 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 underside of the support surface portion 151. By interposing the fixing plate portion 161 between the tank main body portion 130 and the support surface portion 151 of the tank support stand 150, the hydraulic oil tank 30 is supported and fixed to the support surface portion 151 with a gap of the plate thickness of the fixing plate portion 161 between the bottom surface portion 30h of the tank main body portion 130 and the support surface 151a of the tank support stand 150. The support surface portion 151 has four holes 151f for passing the fixing bolts 160 through (see FIG. 12).

[0075] The inverter device 48 is fixed to the mounting support frame 170 and is supported in a vibration-proof manner relative to the hydraulic oil tank 30 and the tank support base 150. That is, the inverter device 48 and the mounting support frame 170 constitute an integral supported body 50 (see FIG. 8), and this supported body 50 is supported in a vibration-proof manner relative to the hydraulic oil tank 30 and the tank support base 150.

[0076] The mounting support frame 170 is composed of a plate-like member bent into a predetermined shape. The mounting support frame 170 has a vertical support plate portion 171 for receiving the mounting of the inverter device 48, a horizontal upper support surface portion 172 provided on the upper side of the support plate portion 171, and a horizontal lower support surface portion 173 provided on the lower side of the support plate portion 171.

[0077] The support plate portion 171 is a rectangular plate-like portion having approximately the same size as the external dimensions of the inverter device 48, in accordance with the external dimensions of the approximately rectangular shape of the inverter device 48 when viewed from the left side. The inverter device 48 is fixed to the support plate portion 171 at its four corners by fixing bolts 175, in a state in which the inverter device 48 covers approximately the entire left side surface 171a, which is the plate surface on the inner side (left side) 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 plate surface on the outer side (right side) of the support plate portion 171.

[0078] The upper support surface portion 172 is a horizontal surface portion bent leftward from the upper edge portion of the support plate portion 171. The lower support surface portion 173 is a horizontal surface portion bent leftward from the lower edge portion of the support plate portion 171.

[0079] The supported object 50 including the inverter device 48 is supported in a vibration-proof manner by vibration-proof rubber 180, which is a vibration-proof member, with respect to each of the hydraulic oil tank 30 and the tank support base 150. The support parts by the vibration-proof rubber 180 are provided at two locations, one at the front and one at the back, with respect to each of the upper support surface portion 172 and the lower support surface portion 173.

[0080] The support portion of the inverter device 48 with respect to the hydraulic oil tank 30 will now be described. The upper support surface portion 172 is supported on 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 for interposing the vibration isolating rubber 180 therebetween and a fixing surface portion 182b which serves as a fixed portion with respect to the upper mounting seat 183, and these surfaces form a substantially "L"-shaped cross section.

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

[0082] The upper mounting seat 183, together with the left side surface 30a of the hydraulic oil tank 30, forms a generally rectangular prism-shaped hollow portion 184 that is open on both front and rear ends. The side surface of the upper mounting seat 183 that is parallel to the left side surface 30a serves as a support surface portion 183a that forms a vertical support surface. The support surface portion 183a is spaced apart from the left side surface portion 30a by the width dimensions of the upper and lower surfaces of the upper mounting seat 183.

[0083] The anti-vibration rubber 180 is made of an elastic material such as a rubber material, such as natural rubber or nitrile rubber. As shown in Fig. 8, the anti-vibration rubber 180 has a shape of a body of revolution about a predetermined central axis, and has a hole 180a penetrating the central axis. The anti-vibration rubber 180 also has a brim-shaped expanded diameter portion 180b in the middle of the axial direction, and has an outer circumferential groove 180c on the upper side of the expanded diameter portion 180b.

[0084] At the support portion of the inverter device 48 for the hydraulic oil tank 30, i.e., at the upper support portion, the vibration-proof 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-proof 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 a hole portion 180a. The vibration-proof rubber 180 is engaged with the upper support stay 182 with the inner peripheral edge of a circular through-hole portion 182c formed in the support surface portion 182a fitted into the outer peripheral groove 180c.

[0085] The portion of the anti-vibration rubber 180 below the outer circumferential groove 180c is sandwiched between the upper support surface portion 172 and the support surface portion 182a of the upper support stay 182, which is attached to each of the upper support surface portion 172 and the upper support stay 182. The portion of the anti-vibration rubber 180 above the outer circumferential groove 180c protrudes from the through-hole portion 182c to the upper side of the support surface portion 182a. The anti-vibration rubber 180 is elastically deformed so that its upper portion penetrates the through-hole portion 182c from below.

[0086] The upper support stay 182 is fixed to the upper mounting seat 183 at two locations, 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 bolt 186 passes through the fixing surface portion 182b and the support surface portion 183a, and is screwed into a nut portion 187 provided on the back side of the support surface portion 183a. The fixing surface portion 182b and the support surface portion 183a are formed with holes 182d, 183d, respectively, for passing the fixing bolt 186 therethrough.

[0087] The support portion of the inverter device 48 with respect to the tank support stand 150 will be described. The lower support surface portion 173 is supported by a lower mounting seat 191 provided on the support surface 151a of the support surface portion 151 via vibration-proof rubber 180. The lower mounting seat 191 is provided at two locations, one at the front and one at the back, corresponding to each vibration-proof 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 having a substantially "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 that the front and rear opening sides are oriented to match the front and rear opening sides 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 that is open on both front and rear end sides. The upper surface portion of the lower mounting seat 191 that is parallel to the support surface 151a serves as the support surface portion 191a that forms a horizontal support surface. The support surface portion 191a is spaced apart from the support surface 151a by the vertical dimensions of the left and right surfaces of the lower mounting seat 191.

[0090] At the support portion of the inverter device 48 for the tank support stand 150, i.e., the lower support portion, the vibration-proof rubber 180 is interposed between the lower support surface 173 of the mounting support frame 170 and the lower mounting seat 191. The vibration-proof rubber 180 is supported on the lower mounting seat 191 with a cylindrical support shaft 195 protruding upward from the support surface 191a inserted into a hole 180a. The vibration-proof rubber 180 is engaged with the lower support surface 173 with the inner peripheral edge of a circular through-hole 173a formed in the lower support surface 173 fitted into an outer peripheral groove 180c.

[0091] The vibration-proof rubber 180 attached to each of the lower mounting seat 191 and the lower support surface portion 173 has a portion below the outer circumferential groove 180c sandwiched between the lower mounting seat 191 and the lower support surface portion 173. Also, the portion of the vibration-proof rubber 180 above the outer circumferential groove 180c protrudes from the through-hole portion 173a to the upper side of the lower support surface portion 173. The vibration-proof rubber 180 is elastically deformed so that its upper portion penetrates the through-hole portion 173a from below.

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

[0093] The mounting support frame 170 that supports the inverter device 48 is provided so as to cover most of the hydraulic oil tank 30 except for the upper edge and front edge of the left side surface portion 30a. The inverter device 48 is provided in a state supported by a tank support base 150 that supports the hydraulic oil tank 30.

[0094] The inverter device 48 supported at four vibration isolation points as described above is an example of an electrical device provided at a position spaced apart from the hydraulic oil tank 30, which is a side surface of the hydraulic oil tank 30. In this embodiment, the inverter device 48 has a support plate portion 171 of a mounting support frame 170 interposed between the hydraulic oil tank 30 and the inverter device 48, 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 is a surface portion 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. That is, a gap 196 of dimension S1 exists 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 FIG. 6). The gap 196 is a vertical surface along the front-rear direction, and is a space portion between the right side surface 171b and the left side surface portion 30a which face each other in the left-right direction.

[0096] In this manner, the inverter device 48 is disposed between the support plate portion 171 and the left side surface portion 30a of the hydraulic oil tank 30 via a gap 196. Note that there is no restriction on whether or not there is a gap between the support plate portion 171 and the inverter device 48.

[0097] The excavator 1 of this embodiment also includes an electric fan 62 provided on the left side of the radiator 61 as a fan for taking 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 part 31 that forms the exterior cover part of the tank part 9 provided to the right of the driving unit 10 (see FIG. 10). Note that FIG. 10 is a schematic cross-sectional view taken along the line AA in FIG. 9.

[0098] Further, an opening 198 that communicates the storage space 197 with the outside is formed in a front lower portion of the hydraulic oil tank 30 of the exterior cover part that forms the storage space 197 of the hydraulic oil tank 30. The opening 198 is formed in the front lower cover part 34 of the exterior cover part that covers the front lower portion of the upper rotating body 20B. The opening 198 is provided at a position below the floor part 8 that extends from the driver's seat support base 14 to the front end of the upper rotating body 20B, and is formed at the front end of the upper rotating body 20B.

[0099] 9, the opening 198 is formed in the front lower cover part 34 on the right side of the support bracket 18 that supports the excavation device 3. The opening 198 is formed to have a substantially rectangular shape in front view by a notched opening 34a formed in the left-right center part of the front lower cover part 34 so as to be continuous with an opening part for projecting the support bracket 18 forward, the base plate part 80, and a right side part of the support bracket 18. The swing hydraulic cylinder 20 is disposed in a space part 159 formed by the tank support stand 150, and extends forward from the opening 198.

[0100] In this configuration, the inverter device 48 is provided 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 arranged side by side in the front and rear direction and erected on the right edge of the base plate portion 80 so as to be contained within the range of the arc-shaped outer shape along which the revolving frame 7 follows in a plan view. In particular, the radiator 61 is provided at the rear of the base plate portion 80, inclined from the outside (right side) to the inside (left side) in the left-right direction from the front side to the rear side in a plan view.

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

[0102] The excavator 1 of this embodiment also includes a driver's section 10 having a driver's seat 15 mounted on a driver's seat support base 14 provided on the rear side of the floor section 8. The driver's seat support base 14 has a horizontal upper surface portion 14a that supports the driver's seat 15, and a front surface portion 14b that rises vertically from the rear edge of the floor section 8.

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

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

[0105] The upper and front sides of the inner cover 199 are located within the range of the outer shape of the right cover part 31 in a left side view. In other words, the inner cover 199 is provided so as not to protrude from the outer shape line of the right cover part 31 on either the upper or front sides in a left side view. The inner cover 199 has an upper surface part 199b located below the upper end of the right cover part 31, and a curved front surface part 199c located inside (lower and rearward) the outer shape line of the right cover part 31 in a side view.

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

[0107] The upper surface portion 199b is provided 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 downward 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 continuous surface portion with a substantially constant dimension in the left-right direction, and form a protruding width to the left from the left side surface portion of the right cover portion 31 in the inner cover 199.

[0108] The internal space of the inner cover 199 is a space portion continuing to the left side of the accommodation space 197 of the hydraulic oil tank 30, and substantially the entire inverter unit 48 supported by the mounting support frame 170 is located inside the inner cover 199 (see FIG. 9). In the left-right direction, the hydraulic oil tank 30 is located inside the accommodation 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 unit 48 (see FIG. 10).

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

[0110] The arrangement and mounting structure of the power supply device 46 will be described with reference to Figures 11 to 14. The power supply device 46 is disposed below the hydraulic oil tank 30 and is supported by a tank support stand 150 that supports the hydraulic oil tank 30.

[0111] The tank support stand 150 forms a space 159 on the rear side of a support surface 151 that supports the hydraulic oil tank 30, and the power supply device 46 is provided in a state supported on the rear side of the support surface 151 of the tank support stand 150. That is, in this embodiment, the power supply device 46 is an example of a second electric device provided in a state supported on the rear side of the support surface 151.

[0112] Power supply device 46 has a generally rectangular thick plate-like shape, with the plate surface direction being horizontal, and is supported in a position parallel to support surface portion 151 so as to be aligned with lower surface 151b, which is the back surface of support surface portion 151. Power supply device 46 has generally the same size as support surface portion 151, which is generally rectangular in plan view, and is provided with its generally rectangular plan view outer shape aligned with the plan view outer shape of support surface portion 151. Front and rear edges of power supply device 46 extend beyond front and rear end surfaces 151c, 151d of support surface portion 151 (see FIG. 12).

[0113] Power supply device 46 is supported on both the front and rear sides by support plates 200 (200A, 200B) relative to support surface portion 151. Support plate 200 is supported in a vibration-proof manner relative to support surface portion 151, and power supply device 46 is supported in a vibration-proof manner relative to support surface portion 151 via support plate 200. The support portion by front support plate 200A and the support portion by rear support plate 200B are configured approximately symmetrically in the front and rear, and have similar support structures.

[0114] The support plate 200 is composed of a plate-like member bent into a predetermined shape. The support plate 200 is a longitudinal support member having a generally crank-shaped cross section, and is provided with its longitudinal direction aligned with the front or rear edge of the support surface portion 151, and is fixed to both the support surface portion 151 and the power feeder 46.

[0115] The support plate 200 has an upper horizontal plane portion 201, a vertical plane portion 202, and a lower horizontal plane portion 203 as surfaces forming a generally crank-shaped cross section. The upper horizontal plane portion 201 and the lower horizontal plane portion 203 are horizontal plane portions parallel to each other, and the front edge of the upper horizontal plane portion 201 and the rear edge of the lower horizontal plane portion 203 are connected by the vertical vertical plane portion 202.

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

[0117] The anti-vibration rubber 210 is formed of an elastic material such as a rubber material, such as natural rubber or nitrile rubber. As shown in Fig. 11, the anti-vibration rubber 210 has a shape of a revolution body centered on a predetermined central axis, and has a hole 210a penetrating the central axis. The anti-vibration rubber 210 also has an outer peripheral groove 210b in the middle part in the axial direction. Note that Fig. 11 shows an enlarged view of a part of the cross section of the part supported by the anti-vibration rubber 210, surrounded by a dashed line.

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

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

[0120] An attachment bolt 212 is inserted from above into the cylindrical portion of the grommet 211 fitted into the hole 210a of the vibration-proof rubber 210. The attachment bolt 212 passes through the vibration-proof rubber 210, the grommet 211, and a 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 attachment bolt 212 and the vibration-proof rubber 210. In this way, the support portion of the support plate 200 by the vibration-proof rubber 210 relative to the support surface portion 151 is fastened and supported to the support surface portion 151 by the attachment bolt 212.

[0121] The power supply device 46 is fixed and supported by front and rear support plates 200 that are elastically supported by the support surface portion 151. The front support plate 200A covers most of the front end face 151c of the support surface portion 151 from the front side, and has the lower horizontal plane portion 203 located on the front side below the support surface portion 151. The rear support plate 200B covers most of the rear end face 151d of the support surface portion 151 from the rear side, and has the lower horizontal plane portion 203 located on the rear side below the support surface portion 151.

[0122] The lower horizontal surface portion 203 of the support plate 200 is fastened from above to the portion of the power supply device 46 that protrudes from the support surface portion 151 in a plan view by a fixing bolt 215. The casing of the power supply device 46 is provided at the front and rear ends with boss portions 46a each having a screw hole that opens upward and into which the fixing bolt 215 is screwed.

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

[0124] As described above, power supply device 46 is positioned below support surface portion 151 of tank support stand 150 in a state where it is vibration-proof supported by vibration-proof supports 220 using vibration-proof rubber 210 at a total of four points, two points on the front side and two points on the rear side, relative to support surface portion 151 via front and rear support plates 200. Most of the right side surface portion of power supply device 46 is covered by outer side surface portion 152 of tank support stand 150, and most of the left side surface portion of power supply device 46 is covered by inner side surface portion 154 of tank support stand 150.

[0125] Power supply device 46, which is supported at four points in the above-described manner in a vibration-isolating manner, is provided at a position spaced apart from lower surface 151b of support surface portion 151 of tank support stand 150. Power supply device 46, which has a substantially rectangular thick plate-like outer shape, has a flat upper surface portion 46b, and is supported below support surface portion 151 in a position parallel to support surface portion 151. Power supply device 46 is provided with a gap between it and support surface portion 151.

[0126] That is, a gap 225 of dimension S2 exists between upper surface 46b of power feeder 46 and lower surface 151b of support surface 151 (see FIG. 11). Gap 225 is a space between lower surface 151b of support surface 151 and upper surface 46b of power feeder 46, which are both horizontal surfaces and face each other in the vertical direction.

[0127] In this way, the power supply device 46 is supported at a position with a gap 225 between it and the support surface portion 151 of the tank support stand 150. The size of the dimension S2 of the gap 225 is adjusted by, for example, the vertical dimension of the vertical surface portion 202 of the support plate 200, etc.

[0128] Further, in space 159 below the tank support stand 150, a converter 230 is provided below the power supply device 46. That is, the excavation machine 1 includes the converter 230 as a third electric device installed below the power supply device 46, which is the second electric device.

[0129] 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, stabilization, etc. Converter 230 exchanges signals with power feeder 46 and a control unit of inverter device 48 to indirectly control the power sent to electric motor 12.

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

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

[0132] Converter 230 has a substantially rectangular parallelepiped shape and is installed with its longitudinal direction facing forward and backward. Converter 230 has a smaller outer shape in a plan view than power supply device 46, and is installed in a position where converter 230 is entirely covered from above by power supply device 46. In addition, the right side surface portion of converter 230 is almost entirely covered by outer side surface portion 152 of tank support base 150, and the front upper portion of the left side surface portion of converter 230 is covered by inner side surface portion 154 of tank support base 150 (see FIG. 13).

[0133] Converter 230 is supported on base plate portion 80 via support base plate 240. Support base plate 240 is supported in a vibration-proof manner relative to base plate portion 80, and converter 230 is supported in a vibration-proof manner relative to base plate portion 80 via support base plate 240.

[0134] The support base plate 240 is composed of a plate-like member bent into a predetermined shape, and forms a platform-like portion on the base plate portion 80. The support base plate 240 has a horizontal device mounting surface portion 241 as a base for receiving the converter 230, and has vertical surface portions 242 and lower support surface portions 243 on both the front and rear sides of the device mounting surface portion 241, which together with the device mounting surface portion 241 form a generally crank-shaped cross section.

[0135] The device mounting surface portion 241 is a rectangular plate-like portion having approximately the same size as the outside dimensions of the converter 230, in accordance with the approximately rectangular outside dimensions of the converter 230 in a plan view. The converter 230 is fixed to the device mounting surface portion 241 at its four corners by fixing bolts 245, in a state in which the converter 230 covers 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 nuts 246 provided on the lower surface 241b of the device mounting surface portion 241.

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

[0137] The support base plate 240 is supported in a vibration-proof manner against the base plate portion 80 by the vibration-proof rubber 210, with the front and rear lower support surface portions 243 overlapping the base plate portion 80 from above. The support portions provided by the vibration-proof rubber 210 are provided at two locations near both ends of the lower support surface portion 243 in the longitudinal direction for each of the front and rear lower support surface portions 243.

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

[0139] Between the anti-vibration rubber 210 and the base plate portion 80, there is interposed a grommet 211 having a tubular portion inserted into a hole portion 210a of the anti-vibration rubber 210. The grommet 211 has a flange portion sandwiched between the lower surface of the anti-vibration rubber 210 and the upper surface 80a of the base plate portion 80. In other words, the portion of the anti-vibration 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] An attachment bolt 247 is inserted from above into the cylindrical portion of the grommet 211 fitted into the hole 210a of the vibration-proof rubber 210. The attachment bolt 247 passes through the vibration-proof 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 attachment bolt 247 and the vibration-proof rubber 210. In this way, the support portion of the support base plate 240 by the vibration-proof rubber 210 relative to the base plate portion 80 is fastened and supported to the base plate portion 80 by the attachment bolt 247.

[0141] As described above, converter 230 is supported in an anti-vibration manner at four locations, two on the front side and two on the rear side, relative to base plate portion 80 via support stand plate 240 by anti-vibration support portions 250 using anti-vibration rubber 210. In this supported state, converter 230 is located below support surface portion 151 of tank support stand 150 and on base plate portion 80.

[0142] The converter 230, which is supported at four points in such a manner as described above, is provided at a position spaced apart from the upper surface 80a of the base plate portion 80. In this embodiment, the converter 230 has the support base 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 portion 241 is a surface portion parallel to the upper surface 80a of the base plate portion 80. The support base plate 240 is provided with a gap between the device mounting surface portion 241 and the upper surface 80a of the base plate portion 80. In other words, a gap 249 exists between the lower surface 241b of the device mounting surface portion 241 and the upper surface 80a of the base plate portion 80. The gap 249 is a space portion between the lower surface 241b and the upper surface 80a, which are both horizontal surfaces and face each other in the vertical direction.

[0144] In this way, the converter 230 has the device mounting surface portion 241 interposed between it and the upper surface 80a of the base plate portion 80 via a gap 249. The size of the gap 229 is adjusted, for example, by the vertical dimension of the vertical surface portion 242 of the support base plate 240. Note that there is no restriction on whether or not there is a gap between the device mounting surface portion 241 and the converter 230.

[0145] According to the excavation machine 1 of this embodiment having the above-mentioned configuration, in a configuration including electrical equipment such as the inverter device 48 that controls the electric motor 12, a high degree of freedom can be obtained in terms of the layout of the electrical equipment, and the electrical equipment can be arranged efficiently in a limited space.

[0146] In this embodiment, the inverter device 48 is provided at a position spaced apart from the left side surface portion 30a with respect to the hydraulic oil tank 30 provided on the revolving frame 7. With this configuration, the inverter device 48 can be arranged in a narrow space within the exterior cover portion of the upper revolving body 20B, and the free space within the exterior cover portion can be used as an arrangement space for other devices. This improves the degree of freedom in design. In other words, the space within the exterior cover portion can be effectively used, and the degree of freedom in the layout of the devices arranged within the exterior cover portion can be improved, so that an optimal design can be made according to the type of construction machine, etc.

[0147] Moreover, the inverter device 48 is provided at a position separated by a gap 196 between it and the left side surface portion 30a of the hydraulic oil tank 30. With this configuration, it is possible to suppress the heat of the hydraulic oil in the hydraulic oil tank 30 from affecting the inverter device 48, and the space near the hydraulic oil tank 30 can be effectively utilized. That is, since the hydraulic oil in the hydraulic oil tank 30 has a higher temperature than the outside air, it is essentially difficult to place precision electrical equipment around the hydraulic oil tank 30, which is a source of heat generation. However, the gap 196, which is an air layer, serves as a heat insulating layer, and it is possible to suppress the direct transfer of heat from the hydraulic oil tank 30 to the inverter device 48.

[0148] Conversely, the presence of the gap 196 can prevent the heat generated by the inverter device 48 during operation from affecting the hydraulic oil in the hydraulic oil tank 30, and a good hydraulic oil temperature can be maintained. In this way, the provision of the gap 196 can suppress the transfer of heat between the hydraulic oil tank 30 and the inverter device 48. In particular, in this embodiment, the support plate portion 171 of the mounting support frame 170 is interposed between the hydraulic oil tank 30 and the inverter device 48, so that the transfer of heat between the hydraulic oil tank 30 and the inverter device 48 can be effectively suppressed.

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

[0150] Moreover, the inverter device 48 is provided in a state supported by the tank support stand 150. With this configuration, the inverter device 48 can be indirectly supported on the base plate portion 80 by utilizing an existing configuration, so that it is possible to suppress the vibration of the revolving frame 7 from directly affecting the inverter device 48, and it is possible to safely install the inverter device 48. In particular, since the inverter device 48 is supported by the vibration-proof support portions 190 at four locations via the mounting support frame 170, it is possible to effectively suppress the influence of the vibration of the machine body on the inverter device 48.

[0151] The inverter device 48 is provided between an opening 198 formed at the front end of the upper revolving body 20B, which is located in front of and below the hydraulic oil tank 30 in the exterior cover, and the electric fan 62. With this configuration, with the operation of the electric fan 62, outside air can be taken into the exterior cover, such as the storage space 197 of the hydraulic oil tank 30 and the space inside the driver's seat support base 14, so that the ambient temperature inside the exterior cover can be kept at an appropriate level.

[0152] Specifically, as shown in Fig. 10, outside air is taken into the exterior cover part from the opening 198 by the suction action of the electric fan 62 (see arrow A1). The air taken into the exterior cover part passes above the tank support base 150, forms a rearward flow, passes through the radiator 61, and is discharged to the outside of the exterior cover part. Outside air is also taken into the exterior cover part from the opening 80b formed in the base plate part 80.

[0153] The air taken in through the openings 198 and the like passes through the gaps 196 and the like between the hydraulic oil tank 30 and the inverter device 48, forming a smooth flow without stagnating around the inverter device 48. This makes it possible to prevent the temperature in the internal space of the exterior cover from rising excessively, and to maintain good operating conditions of the electrical equipment.

[0154] In addition, in a configuration in which the electric fan 62 is provided outside (on the right side) of the radiator 61, an air flow opposite to that in this embodiment is formed. That is, outside air is taken into the space inside the exterior cover from the rear of the body by the electric fan 62, and is discharged from the opening 198 on the front side of the body. Even with such a configuration, an excessive increase in temperature in the internal space of the exterior cover can be suppressed, and the internal ambient temperature can be maintained at an appropriate temperature.

[0155] In this embodiment, the hydraulic oil tank 30 is disposed in front of the electric fan 62 disposed on the right edge of the upper rotating body 20B, the electric motor 12 is disposed at the rear of the upper rotating body 20B, and an inner cover 199 covering the inverter device 48 is provided between the floor 8 and the right cover part 31. With this configuration, even in a configuration in which the internal space of the exterior cover part is narrow and it is difficult to form an efficient air flow path, such as a relatively small rear small swing type excavator such as the excavator 1, it is possible to easily form an air flow path around the inverter device 48 without being blocked by other devices. This makes it possible to maintain the ambient temperature in the internal space of the exterior cover part at an appropriate temperature.

[0156] Furthermore, the excavation machine 1 has the space behind (below) the support surface 151 of the tank support stand 150 as a first installation section for electrical equipment, and is equipped with a power supply unit 46 as electrical equipment provided in the first installation section. With this configuration, the space within the exterior cover can be effectively utilized, and the degree of freedom in the layout of the equipment disposed within the exterior cover can be improved, allowing an optimum design to be made according to the type of construction machine, etc.

[0157] Furthermore, the excavator 1 is provided with an installation section for the converter 230 below the first installation section as a second installation section in the space 159 below the tank support stand 150. With this configuration, it is possible to more effectively utilize the space within the exterior cover section, and it is possible to improve the degree of freedom in the layout of other equipment.

[0158] Moreover, the power supply device 46 is provided at a position separated by a gap 225 from the support surface portion 151 on which the hydraulic oil tank 30 is placed. With this configuration, it is possible to suppress the heat of the hydraulic oil in the hydraulic oil tank 30 from affecting the power supply device 46. In other words, the gap 225, which is an air layer, serves as a heat insulating layer, and it is possible to suppress the heat from the hydraulic oil tank 30 from being transmitted to the power supply device 46.

[0159] Conversely, the presence of gap 225 can prevent the heat generated by power supply device 46 during operation from affecting the hydraulic oil in hydraulic oil tank 30, and a good hydraulic oil temperature can be maintained. In this way, by providing gap 225, it is possible to suppress the transfer of heat between hydraulic oil tank 30 and power supply device 46. Furthermore, gap 225 and space 159 below tank support base 150 serve as a passage for air taken in from opening 198, and therefore it is possible to suppress the accumulation of heat around power supply device 46.

[0160] Moreover, because converter 230 is installed below power supply device 46, it is located farther away from hydraulic oil tank 30 than power supply device 46 is, and the influence of heat on hydraulic oil tank 30 can be suppressed. Furthermore, gap 249 below converter 230 and space 159 below tank support stand 150 serve as a passage for air taken in from opening 198, and therefore it is possible to suppress heat from building up around converter 230.

[0161] Moreover, the power supply device 46 is vibration-proof supported by the tank support base 150 at four vibration-proof supports 220. With this configuration, it is possible to prevent the vibration of the revolving frame 7 from directly affecting the inverter device 48, and it is possible to safely install the power supply device 46. Moreover, the converter 230 is vibration-proof supported by the base plate portion 80 at four vibration-proof supports 250. This makes it possible to prevent the vibration of the revolving frame 7 from affecting the converter 230.

[0162] According to the layout configuration of the inverter device 48, the power supply device 46, and the converter 230 of this embodiment, for example, in relation to an engine machine equipped with an engine instead of the electric motor 12 as a drive source, it is possible to use the configuration of the upper rotating body of an existing engine machine as is or with some modifications, without changing the frame structure of the revolving frame 7 or the layout of other devices on the revolving frame 7. In other words, it is possible to share the basic configuration of the upper rotating body between the electric configuration equipped with the electric motor 12 and the engine machine. This allows costs to be reduced.

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

[0164] For example, in a construction machine such as the excavator 1, a hydraulic oil tank is provided that stores hydraulic oil to be supplied to hydraulic actuators such as hydraulic cylinders that constitute the excavation device. The hydraulic oil in the hydraulic oil tank is supplied to the hydraulic actuators via a hydraulic pump, a control valve, etc.

[0165] For example, Japanese Patent No. 3952994 discloses a configuration in which a drain pipe is branched off from a return pipe made of a hose or the like that is arranged below the hydraulic oil tank in the upper rotating body of a construction machine, and an opening and closing means is provided at the outlet of the drain pipe, so that when the outlet of the drain pipe is opened by the opening and closing means, the oil in the hydraulic oil tank can be discharged through the return pipe. With this 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 pipe are arranged at the center of the upper rotating body as the machine body, which results in a complicated piping configuration and complicated drainage work (waste oil work).

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

[0168] 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 portion 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 main body portion 130 by bolts 262, and a connection pipe portion 264 protruding from the flange portion 263. One end side of the suction pipe 261 is connected in communication with the connection pipe portion 264.

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

[0170] 6 and 15, the hydraulic oil tank 30 is installed on a tank support stand 150 provided on the right front edge of the base plate portion 80 of the revolving frame 7. The hydraulic oil tank 30 has a drain port 270.

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

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

[0173] The drain port 270 is disposed on the edge of the outer periphery of the hydraulic oil tank 30, and protrudes downward from the bottom surface 30h. In a plan view, the bottom surface 30h is substantially pentagonal in shape with sides along the left side surface 30a, the front surface 30b, the right front inclined surface 30c, the right rear inclined surface 30e, and the rear surface 30d of the tank main body 130 (see Figs. 8 and 15). The bottom surface 30h has edges that protrude slightly in a brim-like manner corresponding to the front surface 30b, the right front inclined surface 30c, the right rear inclined surface 30e, and the rear surface 30d.

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

[0175] The hydraulic oil tank 30 has a right edge of the bottom surface portion 30h as a protruding edge portion 272 that protrudes in an eave-like manner from the support surface portion 151 of the tank support base 150 toward the outer surface portion 152. As shown in FIG. 15, the protruding edge portion 272 is a portion of the bottom surface portion 30h that protrudes from the outer surface 152a of the outer surface portion 152 to the outer peripheral side of the base plate portion 80 (the right side in FIG. 15). In FIG. 15, the dimension of the portion of the bottom surface portion 30h that protrudes from the outer surface 152a of the outer surface portion 152 is indicated by dimension B1. Also, the portion of the side portion of the tank main body portion 130 that protrudes from the outer surface 152a of the outer surface portion 152 includes the lower part of the corner that forms the ridge portion 30j.

[0176] In this manner, the hydraulic oil tank 30 has a portion of the outer peripheral portion of the base plate portion 80 of the tank main body 130 protruding from the outer peripheral edge of the tank support stand 150. The outer protruding edge 272 of the bottom surface portion 30h, which is the outer peripheral edge of the hydraulic oil tank 30, includes a location for disposing the drain port 270. In other words, the drain port 270 is disposed between the outer peripheral edge of the protruding edge 272, which is the outer peripheral edge of the hydraulic oil tank 30, and the outer surface portion 152, which is the outer peripheral edge of the tank support stand 150.

[0177] Further, the hydraulic oil tank 30 has a right edge of the bottom portion 30h that protrudes outward relative to the outer peripheral edge of the base plate portion 80. As shown in Figures 15 and 16, the base plate portion 80 has an outer peripheral surface 80c that forms the outer peripheral edge thereof positioned on the outer peripheral side (right side in Figure 15) relative to the outer surface portion 152 of the tank support stand 150.

[0178] The protruding edge 272 of the bottom surface 30h of the tank main body 130 has its outer peripheral portion protruding outward from the outer peripheral surface 80c of the base plate portion 80. In Fig. 15, the dimension of the portion of the bottom surface 30h that protrudes outward from the outer peripheral surface 80c of the base plate portion 80 is indicated by dimension B2. In this manner, the hydraulic oil tank 30 has a portion of the portion of the tank main body 130 that is on the outer peripheral side of the base plate portion 80 protruding from the edge of the outer peripheral side of the base plate portion 80.

[0179] As shown in Fig. 6, the tank body 130 of the hydraulic oil tank 30 is trapezoidal in front view, with a left side surface 30a, a bottom surface 30h, a ridge line 30j, and a rear upper surface 30f. The left side surface 30a located on the inner left and right sides of the tank body 130 is a vertical surface, and forms a right angle together with the bottom surface 30h in front view. The ridge line 30j of the tank body 130 is inclined from the inner left and right sides toward the outer side from the upper side to the lower side, and forms an acute angle together with the bottom surface 30h in front view.

[0180] In the tank body 130 thus having a trapezoidal shape in front view, the width dimension X1 of the rear upper surface portion 30f and the width dimension X2 of the bottom surface portion 30h in the left-right direction are different from each other, as shown in Fig. 6. The left-right inner edges (right side in Fig. 6) of the rear upper surface portion 30f and the bottom surface portion 30h are positioned substantially at the same left-right positions. In addition, the left-right outer edges (left side in Fig. 6) of these surfaces are positioned more left-right outer than the rear upper surface portion 30f. As a result, the width dimension X2 of the bottom surface portion 30h is longer than the width dimension X1 of the rear upper surface portion 30f.

[0181] In this way, the tank body 130 has an upper end surface formed by the rear upper surface portion 30f and a lower end surface formed by the bottom surface portion 30h that have different left and right widths. The tank body 130 has a lower end surface that is longer than the upper end surface due to the inclination of the side surfaces on the left and right outer sides. As shown in FIG. 15, a drain port 270 is provided below a portion of the lower end surface of the tank body 130 that protrudes outward from the upper end surface to the left and right.

[0182] In the hydraulic oil tank 30, the upper surface of the bottom portion 30h forming the bottom surface of the hydraulic oil storage space can be an inclined surface that slopes downward from the left-right inner side to the left-right outer side. Specifically, as shown in Fig. 15, a bottom surface 278 of the storage space, which is the upper surface of the bottom portion 30h, is an inclined surface that slopes gradually downward from the left-right inner side to the left-right outer side. Here, with respect to the inclination of the bottom surface 278, the left-right inner side is the side of the rotation center of the base plate portion 80 that follows the circular outer shape, and the left-right outer side is the radial outer side of the base plate portion 80.

[0183] In this manner, when the bottom surface 278 of the hydraulic oil tank 30 is configured as an inclined surface, the bottom surface portion 30h formed of a plate-like member becomes an inclined surface portion that is inclined as a whole along the inclination of the bottom surface 278. In this manner, the bottom surface 278 of the hydraulic oil tank 30 can be inclined so as to descend toward the edge portion on the outer circumferential side of the base plate portion 80.

[0184] A base end portion, which is one end portion of a drain hose 280, is connected in communication with the drain port 270. The base end portion of the drain hose 280 is connected to the drain port 270 via an upper pipe joint 281.

[0185] The upper pipe fitting 281 is a straight tubular member having a nut-shaped portion in the middle. The upper portion of the upper pipe fitting 281, which is one end side, is attached to the connector 276 forming the drain port 270 in a state where it is inserted from below into the connector 276. The upper pipe fitting 281 is fixed to the connector 276 by screwing or press-fitting or the like. The upper open end surface of the upper pipe fitting 281 is positioned directly below the mounting port 275.

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

[0187] The drain hose 280 extends downward from the drain port 270, and is fixed via a drain socket 283 to the outer surface portion 152 forming the side wall of the tank support stand 150. The drain socket 283 is made of a cylindrical metal member having a through hole formed in its inner circumferential surface. The drain socket 283 is attached to the lower edge of the outer surface portion 152, and to the middle of the outer surface portion 152 in the width direction, via a fixing plate portion 284, with the penetration direction of the through hole, which serves as a flow path for the hydraulic oil, being the up-down direction. The drain socket 283 is provided at a position slightly shifted forward from the drain port 270 in the front-rear direction.

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

[0189] The other end, that is, the lower end, of the drain hose 280 is connected in communication with the drain socket 283. The lower end of the drain hose 280 is connected in communication with the drain socket 283 via a lower pipe joint 286.

[0190] Lower pipe joint 286 is a straight tubular member, and is attached to drain hose 280 with an upper portion, which is one end side, inserted from below into the lower end of drain hose 280. The lower end of drain hose 280 is fixed to lower pipe joint 286 by a hose belt 287 or the like with the upper portion of lower pipe joint 286 inserted therein.

[0191] The lower pipe fitting 286 is attached to the drain socket 283 with its lower end, which is the other end side, inserted into the drain socket 283 from above. The lower pipe fitting 286 is fixed to the drain socket 283 by screwing or press-fitting. The lower pipe fitting 286 has a lower opening that opens into the hole of the drain socket 283.

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

[0193] A drain bolt 290 is attached to the lower opening of drain socket 283. A thread is formed on the inner circumferential surface of the hole of drain socket 283, and drain bolt 290 is screwed into the hole of drain socket 283 from below. The lower opening of drain socket 283 serves as a discharge port for hydraulic oil. The lower open end surface of drain socket 283 is located near upper surface 80a of base plate portion 80 in the up-down direction.

[0194] In the drain structure described above, draining is performed by removing the drain bolt 290 from the drain socket 283. The hydraulic oil in the hydraulic oil tank 30 flows by gravity from the drain port 270 through the upper pipe joint 281, the drain hose 280, and the lower pipe joint 286 into the hole of the drain socket 283, and then flows downward from the hole of the drain socket 283. After the draining operation, 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 in the outer peripheral edge of the base plate portion 80 below the drain socket 283. As shown in Fig. 17, the notch 80d is a recess that is cut out in a substantially semicircular shape relative to the circumferential shape of the outer peripheral surface 80c of the base plate portion 80. Due to the notch 80d, the lower end of the drain bolt 290 is located lower than the upper surface 80a of the base plate portion 80 in the up-down direction.

[0196] As shown in Fig. 17, in bottom view, the cutout portion 80d has an arc shape that is approximately concentric with drain socket 283 and drain bolt 290, which have a circumferential outer shape. The radius of the arc shape that the cutout portion 80d follows is approximately twice the radius of the circumferential shape that the outer shape of drain socket 283 follows. In bottom view, drain socket 283 is provided such that approximately 1 / 3 of its inner side (lower side in Fig. 17) is located inside the arc shape that the outer circumferential surface 80c of base plate portion 80 follows. In Fig. 17, the arc shape that the outer circumferential surface 80c of base plate portion 80 follows is indicated by a two-dot chain line.

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

[0198] The side cover portion 31b has its rear edge abutted against the right edge of the rear cover portion 32 and the counterweight 142 (see FIG. 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] Drain port 270 is covered by side cover portion 31b of right cover portion 31. Moreover, most of drain hose 280 located below drain port 270 is covered by side cover portion 31b except for its lower end portion. Moreover, the lower end portion of drain hose 280, drain socket 283, and drain bolt 290 are covered by lower edge cover portion 31c of right cover portion 31.

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

[0201] In the drain structure according to this embodiment, a drain port 270 is provided on the outer peripheral edge of the hydraulic oil tank 30. With this configuration, the drain pipe can be laid on the outer periphery of the revolving frame 7, eliminating the need to lay the drain pipe on the rotation center side of the upper revolving body 20B, and making it possible to simplify the piping configuration.

[0202] Moreover, the drain port 270 is configured with an attachment port 275 formed in the bottom surface portion 30h of the hydraulic oil tank 30, and a connector 276 attached to the attachment port 275. With this configuration, the drain port 270 can be made to have a simple configuration.

[0203] Moreover, the hydraulic oil tank 30 is placed on the tank support stand 150, and a part of the hydraulic oil tank 30 protrudes from the edge of the outer periphery of the tank support stand 150. According to this configuration, by utilizing the part of the hydraulic oil tank 30 protruding from the tank support stand 150, it is possible to easily provide a drain port 270.

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

[0205] Moreover, the hydraulic oil tank 30 has a shape in which the dimensions of the bottom surface of the tank main body 130 are larger toward the outer periphery than the dimensions of the top surface of the tank main body 130. With this configuration, by providing a drain port 270 below the bottom surface that protrudes toward the outer periphery relative to the top surface of the tank main body 130, the space below the hydraulic oil tank 30 can be effectively utilized.

[0206] Furthermore, the hydraulic oil tank 30 has a bottom surface 278 of the tank body 130 that is inclined downward from the left-right inner side to the left-right outer side. With this configuration, the bottom surface 278 of the hydraulic oil tank 30 is inclined downward toward the location where the drain port 270 is disposed. This makes it easier to guide the hydraulic oil in the hydraulic oil tank 30 toward the drain port 270, and allows efficient draining work.

[0207] Furthermore, drain hose 280 connected to drain port 270 is provided in a fixed state via drain socket 283 or the like on the outside of outer side surface portion 152 of tank support stand 150. According to such a configuration, drain hose 280 can be arranged and supported with a simple structure by utilizing the space on the outer periphery side of tank support stand 150.

[0208] Furthermore, drain socket 283, to which drain hose 280 is connected and to which drain bolt 290 is attached, is fixed to the outside of outer surface portion 152 of tank support stand 150. With this configuration, drain socket 283, which serves as a discharge port for hydraulic oil, can be provided on the outer periphery of tank support stand 150, so that good access to drain socket 283 can be obtained and the operability of draining work can be improved.

[0209] Furthermore, a portion of the hydraulic oil tank 30 protrudes from the outer peripheral edge of the base plate portion 80 that supports the tank support stand 150. With this configuration, by providing the drain port 270 on the portion of the hydraulic oil tank 30 that protrudes from the base plate portion 80, the drain flow path extending downward from the drain port 270 can be positioned on the outer peripheral edge of the base plate portion 80, and good accessibility to the drain socket 283 can be obtained.

[0210] Moreover, base plate portion 80 has a notch 80d at a position on the outer periphery corresponding to the arrangement of drain socket 283. With such a configuration, it is possible to prevent drain socket 283 and drain bolt 290 from interfering with base plate portion 80, so that drain socket 283 is prevented from protruding outward, thereby saving space. Also, it is possible to ensure space for attaching and detaching drain bolt 290 attached to drain socket 283, so that the attachment and detachment of drain bolt 290 can be easily performed.

[0211] Further, the drain port 270 is covered by the right cover part 31. According to such a configuration, the right cover part 31 can protect the drain flow path structure, such as the drain port 270 and the drain hose 280 connected to the drain port 270.

[0212] The above-mentioned embodiment is an example of the present invention, and the construction machine according to the present invention is not limited to the above-mentioned embodiment. Therefore, even if it is other than the above-mentioned embodiment, various modifications are possible according to the design, etc., as long as they do not deviate from the technical idea of ​​the present invention. Furthermore, the effects described in this disclosure are merely examples and are not limited, and other effects may be obtained.

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

[0214] The inverter device 48, the power supply device 46, and the converter 230 may be arranged in such a manner that the positions of these electric devices are appropriately interchanged. Therefore, for the second electric device and the third electric device arranged in the space 159 below the tank support stand 150, any two electric devices among the inverter device 48, the power supply device 46, and the converter 230 may be appropriately selected. In addition, electric devices other than the inverter device 48, the power supply device 46, and the converter 230 may be adopted as the first electric device, the second electric device, and the third electric device.

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

[0216] In addition, the arrangement of the driving section 10 in the upper rotating body 20B and the arrangement of the equipment such as the electric motor 12, hydraulic pump 41, hydraulic oil tank 30, radiator 61, electric fan 62, etc. may be a configuration obtained by flipping the configuration of the above-mentioned embodiment left to right. [Explanation of symbols]

[0217] 1. Excavation machine (construction machine) 7 Swivel frame (frame) 8 Floor 10 Driving section 12 Electric motor (prime mover) 14 Driver's seat support (seat mount) 15 Driver's seat 20B Upper rotating body (airframe) 30 Hydraulic Oil Tank 30a Left side part 31 Right cover part 34 Lower front cover 41 Hydraulic pump 43 Actuator 46 Power supply (electrical equipment) 47 Battery Unit 48 Inverter device (electrical equipment) 62 Electric fan (fan) 80 Base plate part 150 Tank support base (pedestal) 151 Support surface section 152 External surface 159 Space section 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. The hydraulic pump is driven by an electric motor using electric power from the battery unit, and a fan is provided to generate an air flow inside the vehicle. The electric motor is disposed below the fan. Construction machinery.

2. The electric motor is disposed below the battery unit.

2. The construction machine according to claim 1.

3. The electric motor is disposed to the side of the battery unit and below a hydraulic oil tank that stores hydraulic oil delivered by the hydraulic pump. The construction machine according to claim 1 or 2.

4. an electric device disposed in front of the battery unit; The electrical device is disposed below the fan. The construction machine according to claim 1 or 2.

5. The fan and the hydraulic oil tank are arranged side by side in the front-rear direction on one of the left and right sides of the battery unit. The construction machine according to claim 3.

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