Construction machine

Abstract

To effectively suppress vibration of a battery unit with a simple and inexpensive configuration in which a battery unit for supplying power to an electric motor is provided.SOLUTION: A work machine comprises: a revolving frame 7; a portal frame 110 that is a frame structure erected on the revolving frame 7; and a battery unit 47 provided on the revolving frame 7 and supplying power to an electric motor 12. The battery unit 47 is hung from the portal frame 110 to be supported.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a construction machine equipped with an electric motor as a drive source and a battery unit for supplying power to the electric motor. [Background technology]

[0002] Conventionally, there have been electric construction machines such as excavators that are equipped with an electric motor as a drive source. An example of an electric construction machine is an excavator that has a lower traveling body and an upper rotating body that is mounted so as to be rotatable relative to the lower traveling body, with the electric motor mounted on the upper rotating body (see, for example, Patent Document 1 and Patent Document 2). An electric construction machine is equipped with a battery unit for supplying power to the electric motor (see, for example, Patent Document 1 and Patent Document 2).

[0003] Patent Document 1 discloses an electric excavator in which an electric motor connected to a hydraulic pump is disposed on the side of a battery unit provided below a driver's section in an upper rotating body.

[0004] Because excavation machines generate relatively large vibrations during operation, it is desirable for the battery unit and electric motor to be supported in a vibration-damping manner on the machine body. Patent Document 2 discloses a configuration in which a battery unit is mounted on the rear of an upper rotating body, with multiple batteries stored in a predetermined arrangement on a shelf-like member, and the top and bottom of the battery unit are supported in a vibration-damping manner on the rotating frame of the upper rotating body by vibration-damping members constituted by vibration-damping rubber. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2020-45630 [Patent Document 2] Japanese Patent Application Laid-Open No. 2013-139675 Summary of the Invention [Problem to be solved by the invention]

[0006] Because vibrations caused by an excavator during operation include components of vibration in various directions, there is a problem in that vibrations cannot be sufficiently suppressed by simply arranging vibration-damping members above and below the battery unit, as in the configuration disclosed in Patent Document 2. Furthermore, while the vibration-damping effect can be improved by increasing the number of support points provided by the vibration-damping members, increasing the number of support points provided by the vibration-damping members increases costs and complicates the structure.

[0007] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a construction machine equipped with a battery unit for supplying power to an electric motor, which has a simple and inexpensive configuration and can effectively suppress vibration of the battery unit. [Means for solving the problem]

[0008] The construction machine of the present invention comprises an electric motor, a battery unit for supplying power to the electric motor, a lower vibration-damping support part that provides vibration-damping support for the lower side of the battery unit relative to the body on which the battery unit is installed, and an upper vibration-damping support part that provides vibration-damping support for the upper side of the battery unit relative to the body, wherein the lower vibration-damping support part is provided on one side of the battery unit in the fore-and-aft direction, and the upper vibration-damping support part is provided on the other side of the battery unit in the fore-and-aft direction.

[0009] A construction machine according to another aspect of the present invention is a construction machine in which the lower vibration-damping support part is provided at the front end of the battery unit and the upper vibration-damping support part is provided at the rear end of the battery unit.

[0010] Another aspect of the present invention is a construction machine in which the frame constituting the machine body includes a base plate portion, a pair of stay portions erected on the base plate portion, and a cross frame portion erected between the pair of stay portions, and the upper vibration-damping support portion is provided on the cross frame portion.

[0011] Another aspect of the present invention is a construction machine in which each of the lower vibration-damping support parts and the upper vibration-damping support part has a first mounting part provided on the frame side that constitutes the body, a second mounting part provided on the battery unit side, a connecting shaft part that connects the first mounting part and the second mounting part so that they can rotate relative to each other, and an elastic member interposed between the first mounting part and the second mounting part via the connecting shaft part.

[0012] A construction machine according to another aspect of the present invention is the construction machine described above, wherein the electric motor is disposed below the battery unit on the machine body.

[0013] 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 the body, the electric motor and the battery unit being arranged below the driver's seat, and the pair of stay sections being erected at the rear of the base plate section. [Effects of the Invention]

[0014] According to the present invention, in a configuration including a battery unit for supplying power to an electric motor, vibration of the battery unit can be effectively suppressed with a simple and inexpensive configuration. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a left side view of an excavation machine according to an embodiment of the present invention. FIG. [Figure 2] 1 is a perspective view of an excavation machine according to an embodiment of the present invention, seen from the front left. [Figure 3]1 is a block diagram showing the 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. [Figure 5] 1 is a left front 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. [Figure 6] FIG. 2 is a partial cross-sectional view of a left side view of an upper rotating body according to an embodiment of the present invention. [Figure 7] FIG. 2 is a left front perspective view showing a support structure for a battery unit according to an embodiment of the present invention. [Figure 8] FIG. 2 is a front view showing a support structure for a battery unit according to an embodiment of the present invention. [Figure 9] FIG. 2 is a rear view showing the support structure for the battery unit according to the embodiment of the present invention. [Figure 10] FIG. 2 is a left side view showing a support structure for a battery unit according to an embodiment of the present invention. [Figure 11] FIG. 2 is a perspective vertical cross-sectional view showing the configuration of a lower vibration isolation support part according to one embodiment of the present invention. [Figure 12] FIG. 2 is a perspective view showing a configuration of an elastic member according to an embodiment of the present invention. [Figure 13] FIG. 2 is a front vertical cross-sectional view showing the configuration of an upper vibration-isolating support part according to one embodiment of the present invention. [Figure 14] 1 is an explanatory diagram of a rotation configuration of an excavation machine according to an embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] The present invention aims to efficiently suppress vibrations of a battery unit in a low-cost, simple configuration by devising a vibration-isolating support configuration for the battery unit in a configuration equipped with a battery unit for supplying power to an electric motor. Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0017] In the embodiments of the present invention, an excavator (shovel) which is a slewing work vehicle will be described as an example of a 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, and wheel loaders.

[0018] The overall configuration of an excavation 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 machine 1 comprises 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.

[0019] The traveling device 2 is the main part of the excavation work 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.

[0020] The running unit 5 has a configuration in which tracks are wound around rotating bodies such as multiple sprockets supported on predetermined frame portions that make up the track frame 6. The running unit 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 units 5, 5, and side frame portions 6b provided on both the left and right sides of the center frame portion 6a.

[0021] The swivel frame 7 is configured to be approximately circular in plan view, and is mounted relative to the track frame 6 so as to be able to swivel in either the left or right direction about a vertical axis by means of swivel supports 6c mounted on the upper side of the track frame 6. The swivel frame 7 is also configured so as to be able to swivel within the left-to-right width of the left and right running sections 5, 5, that is, within the width between the left outer edge of the left running section 5 and the right edge of the right running section 5. This enables the excavator 1 to perform small swing operations.

[0022] 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 / exit for the operator of 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.

[0023] The driving unit 10 is used to drive and operate the traveling device 2 and the excavation device 3. A canopy 13 is provided for the driving unit 10 on the rotating frame 7. The canopy 13 has a pair of left and right rear support columns 13a, 13a erected above the motor unit, a pair of left and right front support columns 13b, 13b erected at the front end of the floor 8, and a canopy roof 13c provided between the front and rear support columns. The canopy roof 13c covers the driving unit 10 from above.

[0024] In the driver's section 10, a driver's seat support base 14, which is a seat mount, is provided on the rear side of the floor section 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 section 8. A plurality of operation pedals 17 for work are arranged on the left and right sides of the travel levers 16 on the floor section 8. In addition, in the driver's section 10, an operation panel section having various operation sections such as operation operation levers for operating working sections such as the excavator 3, and switches is provided around the driver's seat 15.

[0025] The excavator 1 has 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 able to rotate relative to the lower traveling body 20A. The upper rotating body 20B is configured to include a rotating frame 7 which is a frame that constitutes the machine body, and a driving section 10 provided on the rotating frame 7.

[0026] 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 Figure 4). The hydraulic oil tank 30 is provided at the front right side of the rotating frame 7. The hydraulic oil in the hydraulic oil tank 30 is supplied to hydraulic cylinders, etc. that make up the excavation device 3, and to hydraulic cylinders, etc. that the excavation work machine 1 is provided with.

[0027] 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 the radiator 61 provided to the rear of the tank 30, 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, 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 below the left end of the floor part 8. One of the left and right sides of the rear cover part 32 is rotatably supported by a hinge part. The left cover part 33 covers the left side of the driver's seat support base 14.

[0028] The excavator 3 is a front working device provided in front of the traveling unit 2. A support bracket 18 for supporting the excavator 3 protrudes forward from the center of the left and right sides of the front end of the revolving frame 7. A boom support bracket 19 forming the base end of the excavator 3 is supported on the support bracket 18 so as to be rotatable with the vertical direction as the rotation axis direction. The excavator 3 is mounted so as to swing left and right relative to the revolving frame 7 by a swing hydraulic cylinder (not shown) provided on the right side of the boom support bracket 19 between the boom support bracket 19 and the revolving frame 7.

[0029] The excavator 3 has a boom 21 that has a boomerang-like bent shape in a side view and that constitutes the base side of the excavator 3, an arm 22 connected to the tip of the boom 21, and a bucket 23 attached to the tip of the arm 22. The excavator 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.

[0030] The bucket 23 is a work attachment that is detachably connected to the tip of the arm 22 via an attachment attachment / detachment 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.

[0031] In the excavation work machine 1 having the above-described configuration, the desired operation and work are performed by the operator seated in the driver's seat 15 by 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 turn left and right. Furthermore, operation of the work operation lever causes the excavation device 3 to perform excavation work, etc.

[0032] 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 from a hydraulic oil tank 30 to an actuator 43 via a control valve 42.

[0033] 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, a swing hydraulic cylinder, a turning hydraulic cylinder, etc.

[0034] The control valve 42 controls the flow of pressure oil to each hydraulic actuator serving as an actuator 43. The control valve 42 is configured to include a plurality of directional changeover 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 changeover 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.

[0035] As shown in Figure 4, the electric motor 12 is installed laterally at the lower rear 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 its rotary 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 deliver hydraulic oil. A control valve 42 is provided at a predetermined position on the revolving frame 7 of the upper revolving body 20B (for example, on the left side of the front part of the revolving frame 7).

[0036] The excavator 1 also has a pair of left and right traveling hydraulic motors 44, 44 (see Figures 1 and 2). The traveling hydraulic motors 44 are driven by pressure oil supplied from a control valve 42, and are attached to predetermined locations such as the side frame portions 6b of the track frame 6 in each traveling section 5 so as to rotate and drive the drive sprockets 5a. The left and right traveling hydraulic motors 44, 44 drive the respective traveling sections 5, causing the traveling device 2 to travel forward and backward in a straight line and turn left and right.

[0037] As shown in FIG. 3, the excavator 1 is electrically connected directly or indirectly to the electric motor 12 and 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.

[0038] 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 configured by a cable or the like. Power supply device 46 is also electrically connected to battery unit 47 and inverter device 48.

[0039] Power supply device 46 has a function of converting AC power (AC voltage) supplied from commercial power supply 49 into DC power (DC voltage) and outputting it to inverter device 48, a function of converting AC power supplied from commercial power supply 49 into DC power and outputting it to battery unit 47, and a function of outputting 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.

[0040] The excavator 1 has the following three power supply modes, which can be switched by operating a mode selector switch provided on the driver unit 10, for example. That is, the excavator 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.

[0041] The external power supply mode includes at least one of charging the battery unit 47 with power supplied from the commercial power supply 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 supply 49 and, in some cases, receives power for driving from the battery unit 47. The power supplied from the commercial power supply 49 or the battery unit 47 has its voltage stepped down by a DC / DC converter before being supplied to the electric motor 12, an electric fan 62 (described later), and the like.

[0042] As shown in FIG. 4, the power supply device 46 is disposed below the hydraulic oil tank 30 on the revolving frame 7, and is provided in a state where it is supported by a predetermined support member.

[0043] 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 modules are made up of secondary batteries such as lead-acid batteries and lithium-ion batteries. The battery unit 47 supplies DC current to the inverter device 48.

[0044] 4, 5, and 6, the battery unit 47 is installed at the rear of the revolving frame 7, above the electric motor 12. For convenience, the battery unit 47 is shown by a two-dot chain line in FIG.

[0045] The inverter device 48 controls the power output to the electric motor 12, thereby controlling the output of 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 converts AC power supplied from a commercial power source 49 via the power supply 46 into a predetermined voltage and supplies it to the electric motor 12.

[0046] Specifically, inverter device 48 has an inverter circuit that generates AC power from DC power and supplies it to electric motor 12, a calculation control unit that controls this inverter circuit, and a rectifier circuit that converts AC power supplied from commercial power source 49 via power feeder 46 into DC power, boosts the voltage, and outputs the DC power to the inverter circuit. The calculation control unit is configured by, for example, a microcomputer.

[0047] In the external power supply mode, the inverter device 48 converts AC power supplied from the commercial power supply 49 via the power supply device 46 into DC power using a rectifier circuit and outputs the DC power to the inverter circuit, which generates AC power and supplies it to the electric motor 12. On the other hand, in the battery power supply mode, the inverter device 48 receives DC power input supplied from the battery unit 47 using the inverter circuit, generates AC power using the inverter circuit, and supplies it to the electric motor 12.

[0048] 4, 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 and is provided along the left side surface 30a of the hydraulic oil tank 30, supported by a predetermined support member 55 on the left side surface 30a.

[0049] As shown in Figure 4, the excavator 1 also includes a cooling system including a radiator 61 that cools the cooling water supplied to the electric motor 12, inverter device 48, 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 section through which air passes is formed in the radiator 61, and the cooling water is cooled when air is blown from the electric fan 62 and passes through the communication section.

[0050] As shown in FIG. 4 , the radiator 61 has a generally rectangular thick plate-like outer shape and is erected on the right side of the rear of the revolving frame 7. In a plan view, the radiator 61 is inclined in a direction that positions the rear side inward in the front-to-rear direction so as to follow the generally circular outer shape of the revolving frame 7. The electric fan 62 is integrally provided with the radiator 61 on the inner side surface portion 61 a of the radiator 61 so as to cover most of the side surface portion 61 a. The electric fan 62 is driven by power supplied from the commercial power source 49 or the battery unit 47.

[0051] The battery unit 47 and its support structure will be described with reference to Figures 5 to 13. As shown in Figures 5 to 10, 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 positioned above the electric motor 12.

[0052] The battery unit 47 is provided so that the front, rear, left, and right surfaces of the battery main body 70 face in the front, rear, left, and right directions of the upper rotating body 20B. The battery main body 70 has an upper surface 71, a lower surface 72, a front surface 73, a rear surface 74, a left side surface 75, and a right side surface 76, all of which are flat surfaces. The battery unit 47 is provided on the upper rotating body 20B so that the front surface 73 and the rear surface 74 of the battery main body 70 are vertical surfaces extending in the left-right direction, and so that the left side surface 75 and the right side surface 76 of the battery main body 70 are vertical surfaces extending in the front-rear direction.

[0053] The battery unit 47 is supported via a predetermined support member on a base plate portion 80 that constitutes the revolving frame 7. The base plate portion 80 forms the bottom surface of the revolving frame 7 and is composed of horizontally arranged plate-like frame members, etc. The base plate portion 80 has a flat upper surface 80a. A pair of left and right vertical plates 88 are provided on the base plate portion 80 and are arranged approximately along the front-to-rear direction from the rear side of a support bracket 18 that is provided in the center of the front side of the revolving frame 7 on the left and right. The vertical plates 88 are fixed to the base plate portion 80 and constitute part of the revolving frame 7.

[0054] The right vertical plate 88 extends rearward to the rear end of the revolving frame 7, and defines the installation positions 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.

[0055] The battery unit 47 is supported in a vibration-isolating manner by the upper revolving body 20B on which the battery unit 47 is installed. The battery unit 47 is supported by a base plate portion 80 of the revolving frame 7 by a lower vibration-isolating support portion 81 that provides vibration-isolating support for the lower side of the battery unit 47, and an upper vibration-isolating support portion 82 that provides vibration-isolating support for the upper side of the battery unit 47. The lower vibration-isolating support portion 81 is provided on the lower surface portion 72 of the battery main body portion 70, and the upper vibration-isolating support portion 82 is provided on the upper surface portion 71 of the battery main body portion 70. The lower vibration-isolating support portion 81 is provided on the front side of the battery unit 47, and the upper vibration-isolating support portion 82 is provided on the rear side of the battery unit 47.

[0056] In this embodiment, the lower vibration-damping support part 81 and the upper vibration-damping support part 82 are provided at both the left and right ends of the battery main body 70. The lower vibration-damping support part 81 is provided at the front end of the battery unit 47, and the upper vibration-damping support part 82 is provided at the rear end of the battery unit 47.

[0057] Therefore, the lower vibration-damping supports 81 are provided as lower-left vibration-damping supports 81L and lower-right vibration-damping supports 81R located below the tops of the left and right sides of the front lower side of battery main body 70. The upper vibration-damping supports 82 are provided as upper-left vibration-damping supports 82L and upper-right vibration-damping supports 82R located above the tops of the left and right sides of the rear upper side of battery main body 70.

[0058] In this way, the battery unit 47 is vibration-proof supported (elastically supported) at four locations: the lower left vibration-proof support part 81L, the lower right vibration-proof support part 81R, the upper left vibration-proof support part 82L, and the upper right vibration-proof support part 82R, relative to the base plate part 80 of the swivel frame 7. The left and right lower vibration-proof support parts 81 and the left and right upper vibration-proof support parts 82 are configured to be symmetrical or approximately symmetrical.

[0059] The battery unit 47 is supported by four vibration-isolating supports with the battery main body 70 positioned at a predetermined height relative to the base plate 80. Specifically, the distance D1 between the upper surface 80a of the base plate 80 and the lower surface 72 of the battery main body 70 is approximately the same as the vertical dimension D2 of the battery main body 70 (see FIG. 10).

[0060] The following describes the lower vibration-damping support part 81. The lower vibration-damping support part 81 is provided on support legs 85 provided on the upper surface 80a of the base plate part 80. In other words, the front side of the battery main body part 70 is supported by the lower vibration-damping support part 81 on the upper surface 80a of the base plate part 80 via the support legs 85 provided on the upper surface 80a.

[0061] The support leg 85 has a pair of opposing side wall portions 85a and a support surface portion 85b provided between the upper ends of the left and right side wall portions 85a, and these surfaces form a gate shape. The side wall portions 85a are plate-like portions provided perpendicular to the upper surface 80a, and the support surface portion 85b is a plate-like portion provided parallel to the base plate portion 80. The support surface portion 85b, together with the left and right inner side wall portions 85a, is formed by an integral, approximately "L"-shaped plate-like member bent at a right angle.

[0062] The support leg 85 has a horizontal upper surface 85c of the support surface portion 85b as a support surface for the lower vibration-isolating support portion 81. The support leg 85 is fixed to the base plate portion 80 by fixing the lower ends of the left and right side wall portions 85a to the upper surface 80a of the base plate portion 80 by welding or the like. Of the left and right support legs 85, the left support leg 85 has a plate-like member 85d parallel to the support surface portion 85b suspended between the upper portions of the left and right side wall portions 85a.

[0063] As shown in Figure 11, the lower vibration-damping support part 81 has a lower boss part 91 which is a first mounting part provided on the rotating frame 7 side, a lower bracket part 92 which is a second mounting part provided on the battery unit 47 side, a connecting shaft part 93 which connects the lower boss part 91 and the lower bracket part 92 so that they can rotate relative to each other, and an elastic member 94 which is interposed between the lower boss part 91 and the lower bracket part 92 via the connecting shaft part 93.

[0064] The lower boss portion 91 is provided on a support leg portion 85 provided on the upper surface 80a of the base plate portion 80 that constitutes the swivel frame 7. In other words, the lower boss portion 91 is provided on the swivel frame 7 side by being attached to the base plate portion 80 via the support leg portion 85. The lower boss portion 91 is fixed to the upper surface 85c of the support leg portion 85, and is provided as a portion that protrudes upward from the upper surface 85c.

[0065] 11, the lower boss portion 91 has left and right side surfaces 91a that are flat, and an upper portion thereof has a shape that follows a circular arc shape with the upper side being convex in side view. The lower boss portion 91 has a support hole portion 91b for supporting the connecting shaft portion 93 via an elastic member 94. The support hole portion 91b is an opening formed by a cylindrical inner circumferential surface that penetrates the lower boss portion 91 from left to right, and is formed to follow the circular arc shape of the upper portion of the lower boss portion 91 in side view.

[0066] The lower bracket portion 92 is a portion provided to protrude downward from the lower surface portion 72 of the battery main body 70, and has a pair of left and right side surface portions 92a facing each other, and a fixing surface portion 92b provided between the upper ends of the left and right side surface portions 92a. The side surface portions 92a are plate-shaped portions whose thickness direction is in the left-right direction, and the fixing surface portion 92b is plate-shaped portions whose thickness direction is in the up-down direction. In this way, the lower bracket portion 92 is a bent plate-shaped portion whose left and right side surface portions 92a and fixing surface portion 92b form a generally inverted "U" shape in a front view.

[0067] The lower bracket portion 92 is fastened to the battery main body 70 by a fixing bolt 95, which is a fixing member, with the fixing surface portion 92b aligned along the underside 72 of the battery main body 70. The fixing bolt 95 penetrates the fixing surface portion 92b from below and is threaded into a female thread portion that opens toward the underside 72 on the battery main body 70 side. A hole 92c is formed in the fixing surface portion 92b to allow the fixing bolt 95 to pass through.

[0068] The lower bracket portion 92 has the lower boss portion 91 positioned between left and right side surface portions 92a. In other words, the inner surfaces 92d of the left and right side surface portions 92a of the lower bracket portion 92 face the left and right side surfaces 91a of the lower boss portion 91. A gap is provided between the side surface portions 92a and the lower boss portion 91.

[0069] The lower ends of the left and right side surface portions 92a of the lower bracket portion 92 are positioned below the support hole 91b of the lower boss portion 91. In other words, the lower portion of the lower bracket portion 92 covers the area of ​​the lower boss portion 91 where the support hole 91b is formed from the left and right outer sides. In this way, the left and right side surface portions 92a and the fixing surface portion 92b of the lower bracket portion 92 cover most of the upper side of the lower boss portion 91 from above and from both the left and right sides.

[0070] The connecting shaft portion 93 includes a bolt shaft 96 that passes through left and right side surface portions 92a of the lower bracket portion 92 and a support hole 91b in the lower boss portion 91 between them, and a nut 97 that is threaded onto the tip of the bolt shaft 96. The bolt shaft 96, with its axial direction aligned in the left-right direction, passes through the lower bracket portion 92 and the lower boss portion 91 from the outside left and right, with its tip protruding from the inside left and right side surface portions 92a. Holes 92e are formed in the left and right side surface portions 92a to allow the bolt shaft 96 to pass through. The hole 92e allows the bolt shaft 96 to pass through the side surface portions 92a so as to be rotatable relative to one another.

[0071] The bolt shaft 96 has a threaded portion at its tip, onto which a nut 97 is screwed. A plain washer 98 and a spring washer 99, through which the bolt shaft 96 passes, are interposed between the nut 97 and the left and right inner side surface portions 92a.

[0072] 12, the elastic member 94 is a bushing for vibration-damping support having a cylindrical outer shape. The elastic member 94 is fixed by being press-fitted into the support hole 91b of the lower boss 91 with the central axis (cylinder axis) aligned in the left-right direction, and is provided with a bolt shaft 96 passing through it. The elastic member 94 has an inner tube 101 and an outer tube 102 arranged concentrically with each other, and an elastic portion 103 provided between these tubes.

[0073] The inner pipe 101 and the outer pipe 102 are metal pipes made of a metal material such as iron, stainless steel, etc. The inner pipe 101 and the outer pipe 102 have approximately the same length in the central axis direction, and both ends of the inner pipe 101 protrude slightly outward beyond the end faces of the outer pipe 102.

[0074] The elastic portion 103 is made of an elastic material such as a rubber material such as natural rubber or nitrile rubber and is formed to fill the space between the inner tube 101 and the outer tube 102. That is, the elastic portion 103 is interposed between the outer periphery of the inner tube 101 and the inner periphery of the outer tube 102, and the inner periphery of the elastic portion 103 is brought into close contact with almost the entire outer periphery of the inner tube 101, and the outer periphery of the elastic portion 103 is brought into close contact with almost the entire inner periphery of the outer tube 102. The elastic portion 103 is a cylindrical rubber portion that integrates the inner tube 101 and the outer tube 102 together.

[0075] The elastic member 94 defines a support hole 94a, through which the bolt shank 96 passes, using the inner circumferential surface 101a of the inner tube 101. The support hole 94a has an outer diameter substantially the same as the outer diameter of the middle portion of the bolt shank 96, and the bolt shank 96 is inserted and fitted into the support hole 94a so as to be capable of relative rotation. The elastic member 94 also defines an outer circumferential surface 94b, formed by the outer tube 102, as a contact surface with the support hole 91b of the lower boss 91. In this way, the elastic member 94 is interposed between the lower boss 91 and the lower bracket 92, with the bolt shank 96 of the connecting shaft 93 interposed therebetween.

[0076] The lower vibration-damping support part 81 having the above-described configuration elastically supports the lower bracket part 92 via the elastic member 94 so as to be rotatable relative to the lower boss part 91 by a bolt shaft 96 that passes through an elastic member 94 provided on the lower boss part 91. When the elastic member 94 of the lower vibration-damping support part 81 receives a load from the battery main body part 70 via the lower bracket part 92 and the bolt shaft 96, the elastic part 103 of the elastic member 94 exerts an elastic action on the lower boss part 91, with radial compression of the elastic part 103 of the elastic member 94.

[0077] The upper vibration-damping support part 82 will now be described. The upper vibration-damping support part 82 is provided on a gate-shaped frame part 110 that is configured in a roughly gate shape relative 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 that stand on the base plate part 80, and a horizontal frame part 112 that is installed between the left and right stay parts 111.

[0078] The stay portions 111 are linear support portions that extend in the up-down direction. The left and right stay portions 111 are provided at positions spaced apart in the left-right direction by a distance that is longer than the left-right dimension of the battery main body 70 so that the battery main body 70 is positioned between them. The rear of the battery main body 70 is located between the left and right stay portions 111 (see FIG. 10 ). Of the left and right stay portions 111, the left stay portion 111L is provided in proximity to the left side of the left side surface portion 75 of the battery main body 70, and the right stay portion 111R is provided in proximity to the right side of the right side surface portion 76 of the battery main body 70.

[0079] The upper portions of the left and right stay portions 111 extend upward beyond the upper surface portion 71 of the battery main body 70, and the lower portions extend downward beyond the lower surface portion 72 of the battery main body 70. In other words, the battery main body 70 is located in the middle of the stay portions 111 in the up-down direction.

[0080] The left stay portion 111L is supported by the base plate portion 80 via two support pillars 113 erected on the upper surface 80a. One support pillar 113 is located on the left front side of the stay portion 111L, and the other support pillar 113 is located on the right rear side of the stay portion 111L. The support pillar 113 is fixed to the stay portion 111L by a bolt 115 that passes from above through a plate-shaped flange portion 114 provided at the lower end of the stay portion 111L and is screwed into the support pillar 113. The support pillar 113 is fixed to the base plate portion 80 by welding or the like.

[0081] The right stay portion 111R is fixed to a support base portion 116 that is provided along the rear edge of the base plate portion 80. The support base portion 116 is used as an attachment portion for a counterweight 142 (see FIG. 1) that is provided below the rear cover portion 32 of the upper rotating body 20B.

[0082] The support base 116 is a hollow protruding portion provided to form a step with respect to the upper surface 80a of the base plate 80, and has a flat upper surface 116a. A stay portion 111R is provided upright on the right end portion of the support base 116. The stay portion 111R has a plate-shaped flange portion 117 at its lower end, and is fixed by a bolt 118 that passes through the flange portion 117 from above and is screwed into the support base 116 with the flange portion 117 overlapping the right end portion of the upper surface 116a of the support base 116.

[0083] A horizontal frame portion 112 is installed between the upper ends of the left and right stay portions 111. The horizontal frame portion 112 is formed from a longitudinal plate-like member with the left-right direction as the longitudinal direction and the up-down direction as the plate thickness direction. The horizontal frame portion 112 has an upper surface 112a and a lower surface 112b, both of which are horizontal flat surfaces.

[0084] Plate support portions 111a having a predetermined shape for supporting the horizontal frame portion 112 are formed at the upper ends of the left and right stay portions 111, respectively. The horizontal frame portion 112 is fixed to each stay portion 111 by fixing both left and right ends to the plate support portions 111a of the stay portions 111 by welding or the like. As a result, the horizontal frame portion 112 is provided in a state where it is supported horizontally above the left and right stay portions 111, and together with the left and right stay portions 111, it constitutes the portal-shaped frame portion 110.

[0085] Thus, with regard to the support configuration of the upper vibration-damping support part 82, the swivel frame 7 includes a base plate part 80, a pair of stay parts 111 erected on the base plate part 80, and a horizontal frame part 112 suspended between the pair of stay parts 111. The upper vibration-damping support part 82 is provided relative to the horizontal frame part 112.

[0086] The upper vibration-damping support part 82 is provided on a support protrusion 120 provided on the lower surface 112b of the horizontal frame part 112. In other words, the rear side of the battery main body 70 is supported on the upper surface 80a of the base plate part 80 by the upper vibration-damping support part 82 via the gate-shaped frame part 110 and the support protrusion 120 provided on the upper surface 80a.

[0087] The support protrusion 120 has a pair of left and right side wall portions 120a facing each other and a support surface portion 120b provided between the lower ends of the left and right side wall portions 120a, and these surfaces form a generally "U" shape. The side wall portion 120a is a plate-like portion provided perpendicular to the lower surface 112b of the horizontal frame portion 112, and the support surface portion 120b is a plate-like portion provided parallel to the base plate portion 80. The side wall portion 120a and the support surface portion 120b are formed from an integral, generally "U"-shaped plate-like member bent at a right angle.

[0088] The support protrusions 120 have horizontal lower surfaces 120c of the support surface portions 120b as the support surface for the upper vibration-damping support portion 82. The support protrusions 120 are fixed to the side of the horizontal frame portion 112 by fixing the upper ends of the left and right side wall portions 120a to the lower surfaces 112b of the horizontal frame portion 112 by welding or the like. Of the left and right support protrusions 120, the right support protrusion 120 has the upper end of the outer side wall portion 120a fixed by welding or the like to a plate-shaped portion that is bent and formed as the plate support portion 111a at the upper end of the stay portion 111R and extends along the horizontal frame portion 112.

[0089] The upper vibration-damping support part 82 is configured symmetrically in the vertical direction to the lower vibration-damping support part 81, and has the same configuration as the lower vibration-damping support part 81. That is, as shown in Fig. 13, the upper vibration-damping support part 82 has an upper boss part 131 which is a first mounting part provided on the revolving frame 7 side, an upper bracket part 132 which is a second mounting part provided on the battery unit 47 side, a connecting shaft part 133 which connects the upper boss part 131 and the upper bracket part 132 so that they can rotate relative to each other, and an elastic member 94 which is interposed between the upper boss part 131 and the upper bracket part 132 via the connecting shaft part 133.

[0090] The upper boss portion 131 is provided on a support protrusion 120 fixed to a gate-shaped frame portion 110 that stands on the upper surface 80a of the base plate portion 80 that constitutes the revolving frame 7. In other words, the upper boss portion 131 is provided on the revolving frame 7 side by being attached to the base plate portion 80 via the gate-shaped frame portion 110 and the support protrusion 120. The upper boss portion 131 is fixed to the lower surface 120c of the support protrusion 120, and is provided as a portion that protrudes downward from the lower surface 120c.

[0091] 13, the upper boss portion 131 has left and right side surfaces 131a that are flat, and the lower portion has a shape that follows the arc shape with the lower side being convex in side view. The upper boss portion 131 has a support hole portion 131b that supports the connecting shaft portion 133 via an elastic member 134. The support hole portion 131b is an opening formed by a cylindrical inner circumferential surface that penetrates the upper boss portion 131 from left to right, and is formed to follow the arc shape of the upper portion of the upper boss portion 131 in side view.

[0092] The upper bracket portion 132 is a portion provided to protrude upward from the top surface portion 71 of the battery main body 70, and has a pair of left and right side surface portions 132a facing each other in the left-right direction, and a fixing surface portion 132b provided between the lower ends of the left and right side surface portions 132a. The side surface portions 132a are plate-shaped portions whose thickness direction is in the left-right direction, and the fixing surface portion 132b is a plate-shaped portion whose thickness direction is in the up-down direction. In this way, the upper bracket portion 132 is a bent plate-shaped portion that forms a substantially "U" shape in a front view with the left and right side surface portions 132a and the fixing surface portion 132b.

[0093] The upper bracket portion 132 is fastened to the battery main body 70 by a fixing bolt 135, which is a fixing member, with the fixing surface portion 132b aligned along the upper surface portion 71 of the battery main body 70. The fixing bolt 135 penetrates the fixing surface portion 132b from above and is threaded into a female thread portion provided on the battery main body 70 side so as to open toward the upper surface portion 71. A hole 132c is formed in the fixing surface portion 132b, through which the fixing bolt 135 passes.

[0094] The upper bracket portion 132 has the upper boss portion 131 positioned between the left and right side surface portions 132a. In other words, the upper bracket portion 132 has the inner surfaces 132d of the left and right side surface portions 132a facing the left and right side surfaces 131a of the upper boss portion 131. A gap is provided between the side surface portions 132a and the upper boss portion 131.

[0095] The upper ends of the left and right side surface portions 132a of the upper bracket portion 132 are positioned above the support hole portions 131b of the upper boss portion 131. In other words, the upper portion of the upper bracket portion 132 covers the formation site of the support hole portions 131b in the upper boss portion 131 from the left and right outer sides. In this way, the left and right side surface portions 132a and the fixing surface portion 132b of the upper bracket portion 132 cover most of the upper side of the upper boss portion 131 from the bottom and both the left and right sides.

[0096] The connecting shaft portion 133 includes a bolt shaft 136 that passes through left and right side surface portions 132a of the upper bracket portion 132 and a support hole portion 131b of the upper boss portion 131 between them, and a nut 137 that is threaded onto the tip of the bolt shaft 136. The bolt shaft 136, with its axial direction aligned in the left-right direction, passes through the upper bracket portion 132 and the upper boss portion 131 from the inside on the left and right, with its tip portion protruding from the outside on the left and right side surface portions 132a. Holes 132e are formed in the left and right side surface portions 132a to allow the bolt shaft 136 to pass through. The hole 132e allows the bolt shaft 136 to pass through the side surface portions 132a so as to be rotatable relative to one another.

[0097] The bolt shaft 136 has a threaded portion at its tip, onto which a nut 137 is screwed. A plain washer 138 and a spring washer 139, through which the bolt shaft 136 passes, are interposed between the nut 137 and the left and right inner side surface portions 132a.

[0098] In the upper vibration-damping support part 82, the elastic member 94 is fixed by being pressed into the support hole part 131b of the upper boss part 131 with the central axis direction (cylinder axis direction) as the left-right direction, and is provided with the bolt shaft 136 passing through it.

[0099] In the elastic member 94, the support hole 94a has an outer diameter substantially the same as the outer diameter of the middle portion of the bolt shaft 136, and the bolt shaft 136 is inserted and fitted therein so as to be capable of relative rotation. Furthermore, the elastic member 94 has an outer peripheral surface 94b which serves as a contact surface with the support hole portion 131b of the upper boss portion 131. In this way, the elastic member 94 is interposed between the upper boss portion 131 and the upper bracket portion 132 via the bolt shaft 136 of the connecting shaft portion 133.

[0100] The upper vibration-damping support part 82 having the above-described configuration elastically supports the upper bracket part 132 via the elastic member 94 so as to be rotatable relative to the upper boss part 131 by means of a bolt shaft 136 passing through an elastic member 94 provided on the upper boss part 131. When the elastic member 94 of the upper vibration-damping support part 82 receives a load from the battery main body part 70 via the upper bracket part 132 and the bolt shaft 136, the upper vibration-damping support part 82 obtains an elastic action with radial compression of the elastic part 103 of the connecting shaft part 93 against the upper boss part 131.

[0101] As described above, the gate-shaped frame 110, which supports the left and right upper vibration-damping support parts 82 provided at the rear of the battery main body 70, is provided at the rear of the base plate 80. In other words, the pair of stay parts 111 that make up the gate-shaped frame 110 are erected at the rear of the base plate 80.

[0102] In this embodiment, the left stay portion 111L is provided near the left end of the support base portion 116, which is provided along the rear edge of the base plate portion 80. The right stay portion 111R is provided on the right end of the support base portion 116.

[0103] The battery unit 47, which is supported by the left and right lower vibration-isolating support parts 81 and the left and right upper vibration-isolating support parts 82, and the electric motor 12 installed below the battery unit 47, are disposed below the operator's seat 15. That is, as shown in FIG. 6, the excavator 1 is provided with an operator's section 10 on which the operator's seat 15 is installed on an upper revolving body 20B, and the electric motor 12 and battery unit 47 are disposed below the operator's seat 15.

[0104] 6, below the driver's seat 15, the battery unit 47 has substantially the entire battery main body 70 located within the driver's seat support base 14. The driver's seat support base 14, together with the exterior cover of the upper rotating body 20B, forms a storage space for devices and equipment, and has a horizontal upper surface 14a that supports the driver's seat 15 and a front surface 14b that rises vertically from the rear edge of the floor 8 as surfaces that form the storage space.

[0105] The battery unit 47 is provided such that the upper surface 71 of the battery main body 70 is located directly below the upper surface 14a of the driver's seat support base 14, and the front surface 73 of the battery main body 70 is located immediately behind the front surface 14b of the driver's seat support base 14. The battery unit 47 is also provided such that the lower surface 72 of the battery main body 70 is located at approximately the same height as the floor 8. The rear sides of the battery unit 47 and the gate-shaped frame 110 are covered by the rear cover 32.

[0106] The arrangement and support structure of the electric motor 12 will now be described. As shown in Fig. 10, the battery unit 47 is provided on the base plate 80 below the battery main body 70 at a distance D1 that is approximately the same as the vertical dimension D2 of the battery main body 70. The electric motor 12 and hydraulic pump 41 are arranged horizontally in the space below the battery main body 70 on this base plate 80.

[0107] In this way, the electric motor 12 is disposed below the battery unit 47 on the upper swing body 20B. In particular, the electric motor 12 is provided so that the entire or substantially entire electric motor 12 is covered from above by the battery main body 70 in plan view.

[0108] 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 supported in a vibration-damping manner on the revolving frame 7 by a plurality of vibration-damping supports 140. In this embodiment, as shown in Fig. 4, the vibration-damping supports 140 are provided at four locations: two on the left and right sides of the front of the motor-pump unit, and two on the left and right sides of the rear of the motor-pump unit.

[0109] Specifically, of the four vibration-damping supports 140, vibration-damping support 140A located on the front left elastically supports the motor-pump unit via a support stay extending forward from a coupling case 141 that houses the coupling. Vibration-damping support 140B located on the front right elastically supports the motor-pump unit via a support stay extending forward from the casing of the electric motor 12. Vibration-damping support 140C located on the rear left elastically supports the motor-pump unit via a support stay extending rearward from the coupling case 141. And vibration-damping support 140D located on the rear right elastically supports the motor-pump unit via a support stay extending rearward from the casing of the electric motor 12.

[0110] 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 is configured to include 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.

[0111] The excavation machine 1 of this embodiment having the above-described configuration can be said to have the following configuration. Specifically, the excavation machine 1 has an operator's seat 15 located above the electric motor 12 installed at the rear of the upper rotating body 20B. The excavation machine 1 also has a battery unit 47 located between the electric motor 12 and the operator's seat 15. The battery unit 47 has a battery main body 70 located between the electric motor 12 and the operator's seat 15.

[0112] The excavator 1 also has a pair of stays 111 erected behind the electric motor 12, and the battery unit 47 is suspended by a horizontal frame 112 provided between the pair of stays 111. In other words, the rear of the battery unit 47 is supported in a suspended manner by left and right upper vibration-isolating supports 82 provided on the horizontal frame 112. The excavator 1 also has left and right support legs 85 and lower vibration-isolating supports 81 provided for each support leg 85, in front of the electric motor 12, as supports for supporting the battery unit 47.

[0113] Furthermore, the excavation machine 1 of this embodiment is configured so that, when the upper rotating body 20B rotates around a predetermined position relative to the lower traveling body 20A as the center of rotation, the rear end of the upper rotating body 20B is located within the width of the left and right crawler-type traveling parts 5, 5. In other words, the excavation machine 1 is configured so that the upper rotating body 20B is always kept within the width of the left and right traveling parts 5, 5 during its rotation.

[0114] Specifically, as shown in FIG. 14A, in a plan view, the upper rotating body 20B has an outer shape that is approximately circumferential, and an outer shape that is arc-shaped at the rear. In a plan view, the center position of the circumference along which the arc-shaped rear portion of the upper rotating body 20B follows or a position nearby the center position is the rotation center O1 of the upper rotating body 20B relative to the lower running body 20A. In a plan view, the rotation center O1 of the upper rotating body 20B is located approximately at the center in the front-to-rear and width directions of the left and right running units 5, 5. In the upper rotating body 20B, the part with the greatest distance from the rotation center O1, i.e., the greatest radius of the circle centered on the rotation center O1, is the rear end portion that is arc-shaped in a plan view. A counterweight 142 is provided at the rear end portion of the upper rotating body 20B (see FIG. 1).

[0115] The diameter of the maximum circumference of the upper rotating body 20B about the rotation center O1 is smaller than the maximum width W1 of the left and right travel sections 5, 5. As a result, as shown in Figures 14A, 14B and 14C, the excavation machine 1 is configured so that, in a plan view, the rear end of the upper rotating body 20B does not protrude beyond the outer edges of the left and right travel sections 5, 5 within the range of rotation of the upper rotating body 20B. In other words, the excavation machine 1 is configured so that the rear end of the upper rotating body 20B is located within the maximum width W1 of the left and right travel sections 5, 5 that constitute the lower traveling body 20A, regardless of the orientation of the upper rotating body 20B as a result of the rotation of the upper rotating body 20B.

[0116] Fig. 14A shows a state in which the upper rotating body 20B faces forward relative to the lower running body 20A, Fig. 14B shows a state in which the upper rotating body 20B faces right relative to the lower running body 20A, and Fig. 14C shows a state in which the upper rotating body 20B faces left relative to the lower running body 20A. Note that because the upper rotating body 20B is located in the front-to-rear center relative to the running parts 5, 5, even when the upper rotating body 20B faces rearward relative to the lower running body 20A, the rear end of the upper rotating body 20B is located within the maximum width W1 of the left and right running parts 5, 5, just like when the upper rotating body 20B faces forward.

[0117] According to the excavation machine 1 of this embodiment having the above-described configuration, in a configuration including a battery unit 47 for supplying power to the electric motor 12, vibration of the battery unit 47 can be effectively suppressed with a simple and inexpensive configuration.

[0118] The excavator 1 is provided with, as supports for the battery unit 47, left and right lower vibration-isolating supports 81 that support the underside of the battery unit 47, and left and right upper vibration-isolating supports 82 that support the upper side of the battery unit 47, the lower vibration-isolating supports 81 being provided on the front side of the battery unit 47, and the upper vibration-isolating supports 82 being provided on the rear side of the battery unit 47. With this configuration, vibration reduction can be improved compared to, for example, a configuration in which the battery unit 47 is supported at four points on the underside.

[0119] For example, assuming a configuration in which the battery unit 47 is supported at four points on the four corners of the lower side of the battery main body 70, in this support configuration the center of gravity of the battery main body 70 will be located above the four support points. As a result, the battery unit 47 will be more susceptible to vibrations from the revolving frame 7 while the excavator 1 is traveling or working, and the amount of displacement due to the vibration of the battery unit 47 will increase. For example, if the excavator 1 suddenly starts or stops with the upper revolving body 20B facing forward, the battery unit 47 will vibrate in the fore-and-aft direction (see arrow A1 in FIG. 10 ).

[0120] Therefore, according to the support configuration of the battery unit 47 of this embodiment, in a side view, the lower vibration-damping support part 81 and the upper vibration-damping support part 82 are arranged diagonally on the rectangular parallelepiped battery main body 70. Therefore, as shown in Fig. 10, in a side view, the center of gravity G1 of the battery main body 70 is located between the lower vibration-damping support part 81 and the upper vibration-damping support part 82 in both the up-down direction and the front-back direction.

[0121] This allows the force that causes the battery unit 47 to displace due to vibration of the revolving frame 7 to act more directly on the elastic portion 103 of the elastic member 94, thereby reducing the effect of vibration that the battery unit 47 in the upper revolving body 20B receives from the revolving frame 7. In particular, the support configuration for the battery unit 47 of this embodiment can effectively absorb not only vibration in the up-down direction but also swinging of the battery unit 47 in the front-to-back direction (see arrow A1 in FIG. 10).

[0122] Furthermore, the support configuration for the battery unit 47 of the present embodiment can improve the effect of suppressing vibrations of the battery unit 47 without increasing the number of support points by the vibration-isolating support parts (81, 82), compared to a configuration in which the battery unit 47 is supported at four points on the lower side, for example. This makes it possible to obtain an inexpensive and simple configuration that can effectively absorb vibrations of the battery unit 47 without increasing costs or complicating the structure.

[0123] Furthermore, suppressing the vibration of the battery unit 47 allows for effective use of the accommodation space for the battery unit 47. In other words, since the displacement due to the vibration of the battery unit 47 is reduced, the size of the gap between the upper surface 14a and the front surface 14b of the driver's seat support base 14, which form the accommodation space for the battery unit 47, can be reduced to avoid interference with these surfaces, allowing for efficient use of the limited space. This contributes to the miniaturization of the upper rotating body 20B.

[0124] Furthermore, in the excavator 1 of this embodiment, the left and right lower vibration-damping support parts 81 are provided at the front end of the battery main body 70, and the left and right upper vibration-damping support parts 82 are provided at the rear end of the battery main body 70. With this configuration, the top surface 71 of the battery main body 70 can be made flat in front of the positions where the upper vibration-damping support parts 82 are provided, making it possible to use the installation space for the battery unit 47 efficiently.

[0125] Specifically, for example, since a flat shape is ensured over most of the front side of the upper surface 71 of the battery main body 70, it is possible to bring the upper surface 14a of the driver's seat support base 14 as close as possible to the battery main body 70, thereby making effective use of the space within the driver's seat support base 14. Furthermore, in this embodiment, the support base 116, which is the support portion for the counterweight 142, can be used as the support portion of the portal frame 110 for providing the upper vibration-isolating support portion 82, making it possible to make effective use of the installation space for the battery unit 47.

[0126] Furthermore, in the excavator 1 of this embodiment, the left and right upper vibration-damping support parts 82 are suspended by the horizontal frame part 112 between the left and right stay parts 111 that are erected on the base plate part 80. With this configuration, the left and right upper vibration-damping support parts 82 are fixed to the base plate part 80 via the stay parts 111 and the horizontal frame part 112, so that vibrations of the battery unit 47 in the up-down and front-back directions can be effectively suppressed.

[0127] Furthermore, in the excavator 1 of this embodiment, each of the vibration-isolating supports, that is, the lower vibration-isolating support part 81 and the upper vibration-isolating support part 82, has a configuration in which an attachment part (lower boss part 91, upper boss part 131) provided on the revolving frame 7 side is connected to an attachment part (lower bracket part 92, upper bracket part 132) provided on the battery unit 47 side via an elastic member 94. With this simple configuration, the elastic action of the elastic member 94 can effectively absorb vibrations of the battery unit 47.

[0128] In particular, the elastic member 94 is cylindrical and includes a cylindrical elastic portion 103, and is provided with its central axis extending in the left-right direction and passing through the connecting shaft portion 93. With this configuration, it is possible to effectively absorb vibrations of the battery unit 47 in the up-down and front-back directions.

[0129] Furthermore, the electric motor 12 and the battery unit 47 require a larger installation space than the other devices and equipment. For this reason, for example, if the electric motor 12 and the battery unit 47 are arranged horizontally, a larger space is required below the operator's seat 15. This leads to an increase in the turning radius of the upper turning body 20B as the upper turning body 20B becomes larger, which causes a decrease in the workability of the excavator 1.

[0130] Therefore, in the excavator 1 of this embodiment, the electric motor 12 is arranged below the battery unit 47. With this configuration, the electric motor 12 and the battery unit 47, which require a relatively large installation space, can be arranged one above the other, making it easier to ensure space for installing other equipment. As a result, equipment can be efficiently arranged in the space below the driving unit 10, and a configuration can be obtained that is suitable for small construction machines with a relatively small space below the driving unit 10.

[0131] In particular, in this embodiment, the electric motor 12 is disposed below the battery unit 47 as a motor-pump unit including the hydraulic pump 41. With this configuration, it is possible to efficiently utilize the space below the driving section 10.

[0132] Furthermore, in the excavator 1 of this embodiment, the driver's seat 15 is located above the electric motor 12 and battery unit 47, and a pair of stays 111 for mounting the upper vibration-isolating support part 82 are erected at the rear of the base plate part 80. With this configuration, the electric motor 12 and battery unit 47, which require a relatively large installation space, can be arranged one above the other, making it possible to reduce the rearward protrusion of the upper rotating body 20B. This makes it possible to reduce the turning radius for the turning operation of the upper rotating body 20B, resulting in a configuration suitable for small construction machinery.

[0133] In particular, in this embodiment, the hydraulic oil tank 30 installed on the front right side of the base plate 80 is disposed adjacent to the radiator 61 provided together with the electric fan 62 on the right side of the electric motor 12 installed at the rear. With this configuration, it is possible to efficiently arrange various devices and equipment in the space below the driver's section 10.

[0134] Furthermore, in the excavator 1 of this embodiment, the operator's seat 15 is installed above the electric motor 12, which is located at the rear of the swivel frame 7. With this configuration, the electric motor 12, which requires a relatively large installation space, can be installed in a location where space is easily secured, making it easier to secure space for installing other equipment. This allows for efficient use of space, and provides a configuration suitable for small construction machines with relatively limited space below the operator's section 10.

[0135] In particular, in this embodiment, the battery unit 47 is disposed between the electric motor 12 and the driver's seat 15. With this configuration, the electric motor 12 and the battery unit 47, which require a relatively large installation space, can be disposed in a location where the space is easily secured, making it easier to secure space for installing other equipment. This allows the equipment to be arranged efficiently, and provides a configuration suitable for a small construction machine.

[0136] Furthermore, the excavator 1 of this embodiment has a support structure for the battery unit 47 in which the battery unit 47 is suspended by upper vibration-isolating supports 82 between a pair of stays 111 erected behind the electric motor 12. With this structure, the support device for the battery unit 47 can be made compact, and a structure suitable for small construction machinery with relatively limited space below the driving section 10 can be obtained without taking up space in the driving section 10.

[0137] In particular, in this embodiment, left and right lower vibration-isolating support portions 81 are provided in front of the electric motor 12. With this configuration, it is possible to effectively suppress vibration of the battery unit 47 with a compact and simple configuration.

[0138] Furthermore, in the excavation machine 1 of this embodiment, the upper revolving body 20B is configured to be located within the width of the left and right crawler-type traveling sections 5, 5 in a plan view. With this configuration, the battery unit 47 and other equipment can be arranged in a compact configuration, and the rear end of the upper revolving body 20B can be prevented from protruding beyond the width of the left and right traveling sections 5, 5 or can be made smaller, thereby achieving good workability when working with the excavation machine 1.

[0139] The above-described embodiment is an example of the present invention, and the construction machine according to the present invention is not limited to the above-described embodiment. Therefore, even if it is not the above-described embodiment, various modifications can be made depending on 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 limiting, and other effects may also be obtained.

[0140] In the embodiment described above, the lower vibration-damping support part 81 is provided in front of the battery unit 47, and the upper vibration-damping support part 82 is provided behind the battery unit 47, but the positions of the lower vibration-damping support part 81 and the upper vibration-damping support part 82 in the front-to-rear direction are not particularly limited. For example, in contrast to the embodiment described above, a configuration may be possible in which the left and right lower vibration-damping support parts 81 are provided behind the battery unit 47, and the left and right upper vibration-damping support parts 82 are provided ahead. Alternatively, for example, a configuration may be possible in which one left and right lower vibration-damping support part 81 is provided ahead and the other lower vibration-damping support part 81 is provided behind, and one left and right upper vibration-damping support part 82 is provided behind and the other upper vibration-damping support part 82 is provided ahead. [Explanation of symbols]

[0141] 1. Excavation machine (construction machinery) 2 Running gear 5 Running part 7 Swivel frame (frame) 10 Driving Section 12 Electric motor 15 Driver's seat 20A Undercarriage 20B Upper rotating body (airframe) 41 Hydraulic pump 47 Battery Unit 70 Battery body 80 Base plate part 81 Lower vibration isolation support 82 Upper vibration isolation support 91 Lower boss part (first mounting part) 92 Lower bracket part (second mounting part) 93 Connecting shaft part 94 Elastic Members 96 Bolt shaft 110 Gate-type frame section 111 Stay part 112 Horizontal frame section 131 Upper boss part (first mounting part) 132 Upper bracket part (second mounting part) 133 Connecting shaft part 136 Bolt shaft

Claims

1. A rotating frame; a frame structure erected on the revolving frame; a battery unit provided on the revolving frame for supplying power to the electric motor; The battery unit is supported by being suspended from the frame structure. Work machinery.

2. The frame structure includes: The structure is formed by a pair of pillars extending in the vertical direction and a beam portion spanning between the pair of pillars.

2. The work machine according to claim 1.

3. the pair of pillars are arranged on the swivel frame with a gap therebetween that is wider than the width dimension of the battery unit; 3. The work machine according to claim 2.

4. The battery unit is suspended and supported by at least two support portions provided on the beam portion. A work machine according to claim 2 or 3.

5. The two support portions are provided with a gap therebetween that is narrower than the width dimension of the battery unit.

5. The work machine according to claim 4.

6. The battery unit is supported by the support portion at a rear side in the front-rear direction of the revolving frame. A work machine according to claim 4 or claim 5.

7. A connection portion for connecting to the support portion is provided on the upper surface side of the battery unit.

7. The work machine according to claim 6.

8. The battery unit is supported on the revolving frame at a front side in the front-rear direction of the revolving frame.

8. The work machine according to claim 7.

Images