JP6444038B2 - Excavator - Google Patents

Description

  The present invention relates to an excavator in which a power storage device is mounted on a turning frame.

  Patent Document 1 below discloses a hybrid hydraulic excavator. In the hybrid hydraulic excavator disclosed in the cited document 1, a capacitor module that accumulates electric power supplied to an electric assist motor or the like is supported by vibration-proof rubber. By supporting the capacitor module with anti-vibration rubber, it is possible to ensure the reliability and durability of the capacitor module.

JP 2012-21396 A

  The capacitor module disclosed in Patent Document 1 is supported by a support member formed of vibration-proof rubber. The support member includes an anti-vibration rubber and a bolt embedded along its central axis. The tip of the bolt protrudes from the anti-vibration rubber and is inserted into the through hole of the cooling plate of the capacitor module. The support member is fixed to the capacitor module by fastening the nut to the bolt embedded in the vibration-proof rubber.

  The capacitor module is usually mounted on a swing frame of an excavator. Vibration during excavator travel and vibration during turning are applied to the capacitor module. By this vibration, a compression load and a tensile load are applied to the vibration-proof rubber disclosed in Patent Document 1. When a tensile load is applied to the anti-vibration rubber, the deterioration of the rubber is accelerated.

  An object of the present invention is to provide an excavator having a vibration isolation structure in which a tensile load is not applied to an elastic member.

According to one aspect of the invention,
A swivel frame that is pivotably mounted on the lower traveling body,
An electric drive unit including a fastening portion extending outward from a housing portion, wherein the fastening portion is attached to the swivel frame via a vibration isolation structure ;
A bracket attached to the electric drive unit via the anti-vibration structure ; and
The vibration isolation structure includes a first elastic member, a second elastic member, and a fastener,
The bracket, the first elastic member, the fastening portion, and the second elastic member are stacked in this order to form a stacked structure, and the fastener is configured to stack the stacked structure in the stacking direction. And tighten to
Provided is an excavator in which the electric drive unit, the vibration isolating structure, and the bracket constitute a subassembly, and the bracket is fixed to the swivel frame by tightening a bolt inserted downward from above Is done.

Since the fastener fastens the stacked structure in the stacking direction, no tensile load is applied to the first elastic member and the second elastic member. For this reason, it can prevent that deterioration of the 1st elastic member and the 2nd elastic member is accelerated by the tensile load. Furthermore, since it is not necessary to support since it bolted during the assembly operation, work efficiency can be increased.

FIG. 1 is a partially cutaway side view of an excavator according to an embodiment. 2A is a plan view of the power storage device, FIG. 2B is a cross-sectional view of the vibration isolation structure, and FIG. 2C is a cross-sectional view illustrating another configuration example of the vibration isolation structure. FIG. 3 is an exploded perspective view of the power storage device. FIG. 4 is a plan view of the lower housing and the components mounted on the lower housing. 5A is a plan view of the power storage module, and FIG. 5B is a cross-sectional view taken along one-dot chain line 5B-5B in FIG. 5A. 6 is a cross-sectional view taken along one-dot chain line 6-6 in FIG. FIG. 7 is a block diagram of an excavator according to the embodiment. FIG. 8A is a cross-sectional view of an anti-vibration structure, a swivel frame, and a housing before assembly according to another embodiment. FIG. 8B is a cross-sectional view of the vibration isolating structure, the swing frame, and the housing in the middle of assembly, and FIG. 8C is a cross-sectional view of the vibration isolating structure, the swivel frame, and the housing after assembly. FIG. 9 is a cross-sectional view showing another configuration example of the bolt support member shown in FIG. 8A. 10A is a cross-sectional view of a power storage device, an anti-vibration structure, and a swing frame before assembly according to still another embodiment, and FIG. 10B is a cross-sectional view of the power storage device, the anti-vibration structure, and the swing frame after assembly. is there.

  In FIG. 1, the partially broken side view of the shovel by an Example is shown. An upper swing body 12 is mounted on the lower traveling body 10 via a swing bearing 11 so as to be swingable. The upper swing body 12 includes a swing frame 12A, a cover 12B, and a cabin 12C. The turning frame 12A functions as a support structure that supports the cabin 12C and various components. The cover 12B covers various components such as the power storage device 30 mounted on the turning frame 12A. The power storage device 30 is supported by the turning frame 12 </ b> A via the vibration isolation structure 31.

  The turning motor turns the turning frame 12 </ b> A clockwise or counterclockwise with respect to the lower traveling body 10. A boom 15, an arm 16, and a bucket 17 are attached to the upper swing body 12. The boom 15, the arm 16, and the bucket 17 are hydraulically driven by a boom cylinder 18, an arm cylinder 19, and a bucket cylinder 20, respectively.

  FIG. 2A shows a plan view of the power storage device 30. Attachment legs 41 extend from the four corners of the casing 40 having a substantially rectangular planar shape toward the outside. The vibration isolation structure 31 is attached to the attachment foot 41. The housing 40 includes a connector box 59 that protrudes from approximately the center of one edge.

  FIG. 2B shows a cross-sectional view of the vibration-proof structure 31. The turning frame 12A, the first elastic member 32, the first washer 34, the mounting foot 41 of the housing 40, the second washer 35, and the second elastic member 33 are stacked in this order. For the first elastic member 32 and the second elastic member 33, for example, a vibration-proof rubber is used, and a through-hole penetrating in the vertical direction is provided at the center.

  The fastener 36 includes a stacked structure 37 including the revolving frame 12A, the first elastic member 32, the first washer 34, the mounting foot 41 of the housing 40, the second washer 35, and the second elastic member 33. It is tightened in the stacking direction (vertical direction). The fastener 36 includes a bolt 36A and a nut 36B. The bolt 36A penetrates the stacked structure 37 from below to above, and a nut 36B is fastened to the upper end of the bolt 36A. In this way, the housing 40 is supported on the turning frame 12A by the vibration isolation structure 31. In addition, it is good also as a structure which the bolt 36A penetrates the stacking structure 37 from upper direction toward the downward direction, and fastens the nut 36B to the lower end of the bolt 36A.

  When the fastener 36 is loosened, the first elastic member 32 is separated from the turning frame 12 </ b> A and the housing 40. Further, the second elastic member 33 is separated from the housing 40. Washers may be inserted between the revolving frame 12A and the first elastic member 32 and between the second elastic member 33 and the nut 36B, respectively.

  FIG. 2C shows a cross-sectional view of another configuration example of the vibration-proof structure 31. In the example shown in FIG. 2C, the mounting foot 41 of the housing 40, the first elastic member 32, the first washer 34, the turning frame 12A, the second washer 35, and the second elastic member 33 are arranged in this order. Are stacked. A fastener 36 fastens the stacked structure 37 in the stacking direction.

  When the fastener 36 is loosened, the first elastic member 32 is separated from the turning frame 12 </ b> A and the housing 40. The second elastic member 33 is separated from the turning frame 12A.

  2B and 2C, the first elastic member 32 is disposed between the turning frame 12A and the mounting foot 41 of the housing 40. The second elastic member 33 is disposed at one end in the stacking direction of the stacking structure 37 including the mounting foot 41, the first elastic member 32, and the turning frame 12A. In other words, one of the revolving frame 12A and the mounting foot 41, the first elastic member 32, the other of the revolving frame 12A and the mounting foot 41, and the second elastic member 33 are stacked in this order to form a stacked structure 37. doing.

  FIG. 3 is an exploded perspective view of the power storage device 30. The housing 40 (FIG. 2A) includes a lower housing 42 that is open at the top, and a lid 43 that closes an open portion of the lower housing 42. The lower housing 42 includes a bottom surface 51 and side surfaces 52. The side surface 52 is disposed over the entire outer peripheral line of the bottom surface 51. The lower housing 42 and the lid 43 constitute a housing 40 including a bottom surface 51, a side surface 52, and an upper surface.

  Two power storage modules 60 are mounted on the bottom surface 51. An xyz orthogonal coordinate system in which a plane parallel to the bottom surface 51 is defined as an xy plane and a normal direction of the bottom surface 51 is defined as a z direction is defined. The direction in which the two power storage modules 60 are separated is the x direction. Each of the power storage modules 60 includes a plurality of power storage cells stacked in the y direction, and charges and discharges electrical energy. The detailed configuration of the power storage module 60 will be described later with reference to FIGS. 5A and 5B.

  A connector box 59 is provided on one side surface 52 perpendicular to the y direction. The space in the connector box 59 and the space in the lower housing 42 are connected via an opening 58. The opening above the connector box 59 is closed with a connector plate on which connector terminals are arranged.

  A first rib 55, a second rib 56, and a third rib 57 for increasing rigidity are formed on the bottom surface 51. The first rib 55 is disposed between the two power storage modules 60 and extends in the y direction. One end of the first rib 55 is continuous with the side surface 52 opposite to the side surface 52 on which the connector box 59 is provided.

  The second rib 56 is connected to the end of the first rib 55 and extends in two directions parallel to the x direction. The first rib 55 is connected to the center of the second rib 56. The third rib 57 extends in the y direction from both ends of the second rib 56 and reaches the side surface 52 where the connector box 59 is provided. The opening 58 is formed between the locations where the two third ribs 57 are connected to the side surface 52.

With reference to the bottom surface 51, the first rib 55, the second rib 56, and the third rib 57 are lower than the side surface 52. With the opening of the lower housing 42 closed with the lid 43, between the first rib 55 and the lid 43, between the second rib 56 and the lid 43, and between the third rib 57 and the lid 43, A gap is formed between the two.

  Mounting legs 41 extend from the four corners of the bottom surface 51 toward the outside. The bottom surface 51, the side surface 52, the first rib 55, the second rib 56, the third rib 57, the connector box 59, and the mounting foot 41 are integrally molded by a casting method. For example, aluminum is used as the material.

  FIG. 4 shows a plan view of the lower housing 42 and components mounted on the lower housing 42. Two power storage modules 60 are mounted apart in the x direction. The first rib 55 passes in the y direction between the regions where the two power storage modules 60 are mounted. One end of the first rib 55 is continuous with the side surface 52. The other end of the first rib 55 is located outside the end of the power storage module 60 in the y direction. From this end, the second rib 56 extends in two directions parallel to the x direction. The second rib 56 partially overlaps each of the power storage modules 60 in the x direction. From both ends of the second rib 56, the third rib 57 extends in the y direction and reaches the side surface 52 on which the connector box 59 is provided.

  A pair of relay members 61 are arranged in a region surrounded by the second rib 56, the third rib 57, and the connector box 59. A relay circuit 62 is disposed in the connector box 59. Each of the power storage modules 60 has terminals 63 at both ends in the y direction. The storage module 60 is charged and discharged through the terminal 63. Terminals 63 far from the connector box 59 are electrically connected to each other via an electric circuit component 64 including a fuse, a safety switch, and the like.

  The terminals 63 closer to the connector box 59 are electrically connected to the relay member 61 by bus bars 65, respectively. The bus bar 65 intersects with the second rib 56. The relay member 61 is connected to the relay circuit 62 by the bus bar 66. The bus bar 66 passes through the opening 58 (FIG. 3).

  FIG. 5A shows a plan view of the power storage module 60. Plate-shaped storage cells 70 and heat transfer plates 71 are alternately stacked in the thickness direction (y direction). Note that one heat transfer plate 71 may be arranged for a plurality of, for example, two storage cells 70. A pair of electrode tabs 72 are drawn from each of the storage cells 70. The pair of electrode tabs 72 are drawn out in the x direction and in opposite directions. A plurality of energy storage cells 70 are connected in series by connecting the electrode tabs 72 of the energy storage cells 70 adjacent to each other. The electrode tabs 72 of the storage cells 70 at both ends correspond to the two terminals 63 (FIG. 4) of the storage module 60, respectively.

  The pressurizing mechanism 76 applies a compressive force in the stacking direction to the stacked structure in which the storage cell 70 and the heat transfer plate 71 are stacked. The pressure mechanism 76 includes a pressure plate 73 disposed at both ends of the laminated structure and a plurality of tie rods 74 extending from one pressure plate 73 to the other pressure plate 73. By tightening the tie rod 74 with a nut, a compressive force in the stacking direction can be applied to the stacked structure of the storage cell 70 and the heat transfer plate 71.

  FIG. 5B is a cross-sectional view taken along one-dot chain line 5B-5B in FIG. 5A. The pressure plate 73 is screwed to the bottom surface 51 of the lower housing 42 (FIG. 3). The lower end of the heat transfer plate 71 is in contact with the bottom surface 51, and the upper end is in contact with the lid 43. The lid 43 is fastened and fixed to the lower housing 42 with a bolt or the like, and a compressive force in the z direction is applied to the heat transfer plate 71. With this compressive force, the power storage module 60 is firmly and non-slidably fixed in the housing 40 including the lower housing 42 (FIG. 3) and the lid 43 (FIG. 3).

  A cooling medium channel 77 is formed in the bottom surface 51, and a cooling medium channel 78 is also formed in the lid 43. The storage medium 70 can be cooled via the heat transfer plate 71 by circulating a cooling medium such as cooling water through the flow paths 77 and 78.

  FIG. 6 is a cross-sectional view taken along one-dot chain line 6-6 in FIG. A first rib 55 is formed substantially at the center of the bottom surface 51 in the x direction. The power storage module 60 is mounted on both sides of the first rib 55. A lid 43 closes the opening of the lower housing 42. The lid 43 is fixed to the lower housing 42 by fasteners 44 such as bolts and nuts. A channel 77 is formed inside the bottom surface 51, and a channel 78 is formed inside the lid 43. Since the lower housing 42 and the lid 43 apply a compressive force in the z direction to the heat transfer plate 71, the two power storage modules 60 are fixed in the housing 40.

  FIG. 7 shows a block diagram of an excavator according to the embodiment. In FIG. 7, the mechanical power system is represented by a double line, the high-pressure hydraulic line is represented by a thick solid line, the electric control system is represented by a thin solid line, and the pilot line is represented by a broken line.

  The drive shaft of engine 110 is connected to the input shaft of torque transmission mechanism 121. The engine 110 is an engine that generates a driving force using fuel other than electricity, for example, an internal combustion engine such as a diesel engine.

  The drive shaft of the motor generator 111 is connected to the other input shaft of the torque transmission mechanism 121. The motor generator 111 can perform both the electric (assist) operation and the power generation operation. The torque transmission mechanism 121 has two input shafts and one output shaft. A drive shaft of the main pump 122 is connected to the output shaft.

  When the load applied to the main pump 122 is large, the motor generator 111 performs an assist operation, and the driving force of the motor generator 111 is transmitted to the main pump 122 via the torque transmission mechanism 121. Thereby, the load applied to the engine 110 is reduced. On the other hand, when the load applied to the main pump 122 is small, the driving force of the engine 110 is transmitted to the motor generator 111 via the torque transmission mechanism 121, so that the motor generator 111 is operated for power generation.

  The main pump 122 supplies hydraulic pressure to the control valve 124 via the high pressure hydraulic line 123. The control valve 124 distributes hydraulic pressure to the hydraulic motors 109A and 109B, the boom cylinder 18, the arm cylinder 19, and the bucket cylinder 20 in accordance with instructions from the driver. The hydraulic motors 109A and 109B drive two left and right crawlers provided in the lower traveling body 10 (FIG. 1), respectively.

  Motor generator 111 is connected to power storage circuit 112 via inverter 113A. The turning electric motor 102 is connected to the power storage circuit 112 via the inverter 113B. Inverters 113 </ b> A and 113 </ b> B and power storage circuit 112 are controlled by control device 135.

  Inverter 113 </ b> A controls operation of motor generator 111 based on a command from control device 135. Switching between the assist operation and the power generation operation of the motor generator 111 is performed by the inverter 113A.

During the period in which the motor generator 111 is assisted, necessary power is supplied from the power storage circuit 112 to the motor generator 111 through the inverter 113A. During the period in which the motor generator 111 is generating, the electric power generated by the motor generator 111 is converted to the inverter 113.
A is supplied to the power storage circuit 112 through A. Thereby, the power storage device 30 in the power storage circuit 112 is charged. As the power storage device 30 in the power storage circuit 112, the power storage device according to the above embodiment is used.

  The swing electric motor 102 is AC driven by the inverter 113B and can perform both the power running operation and the regenerative operation. During the power running operation of the swing motor 102, electric power is supplied from the power storage circuit 112 to the swing motor 102 via the inverter 113B. The turning electric motor 102 turns the upper turning body 12 (FIG. 1) via the speed reducer 131. During the regenerative operation, the rotary motion of the upper swing body 12 is transmitted to the swing motor 102 via the speed reducer 131, so that the swing motor 102 generates regenerative power. The generated regenerative power is supplied to the power storage circuit 112 via the inverter 113B. Thereby, the power storage device 30 in the power storage circuit 112 is charged.

  The resolver 132 detects the position of the rotating shaft of the turning electric motor 102 in the rotation direction. The detection result of the resolver 132 is input to the control device 135. By detecting the position of the rotating shaft in the rotational direction before and after the operation of the turning electric motor 102, the turning angle and the turning direction are derived.

  A mechanical brake 133 is connected to the rotating shaft of the turning electric motor 102 and generates a mechanical braking force. The braking state and the release state of the mechanical brake 133 are controlled by the control device 135 and are switched by an electromagnetic switch.

  The pilot pump 125 generates a pilot pressure necessary for the hydraulic operation system. The generated pilot pressure is supplied to the operating device 128 via the pilot line 126. The operation device 128 includes a lever and a pedal and is operated by a driver. The operating device 128 converts the primary side hydraulic pressure supplied from the pilot line 126 into a secondary side hydraulic pressure in accordance with the operation of the driver. The secondary hydraulic pressure is transmitted to the control valve 124 via the hydraulic line 129 and also to the pressure sensor 127 via the other hydraulic line 130.

  The pressure detection result detected by the pressure sensor 127 is input to the control device 135. Thereby, the control apparatus 135 can detect the operation state of the lower traveling body 10, the turning electric motor 102, the boom 15, the arm 16, and the bucket 17 (FIG. 1).

  In the above embodiment, the housing 40 (FIG. 2A) of the power storage device 30 is supported by the revolving frame 12 </ b> A via the anti-vibration structure 31 (FIGS. 2B and 2C). For this reason, the vibration of the power storage device 30 can be suppressed.

  Further, since the compressive load in the stacking direction is applied to the first elastic member 32 and the second elastic member 33 (FIGS. 2B and 2C), the first elastic member is not affected even if the revolving frame 12A vibrates. No tensile load is applied to 32 and the second elastic member 33. For example, in the configuration shown in FIG. 2B, when an acceleration is generated in the casing 40 in a direction approaching the revolving frame 12 </ b> A, the compressive load applied to the first elastic member 32 increases, and the second elastic member 33 The applied compressive load is reduced. On the contrary, when the acceleration in the direction away from the revolving frame 12 </ b> A occurs in the housing 40, the compressive load applied to the first elastic member 32 decreases and the compressive load applied to the second elastic member 33 increases. To do. In any case, no tensile load is applied to the first elastic member 32 and the second elastic member 33. For this reason, it is possible to prevent a life from being shortened by applying a tensile load to the vibration-proof rubber.

In the above embodiment, the configuration for suppressing the vibration of the power storage device 30 has been described. However, in order to suppress the vibration of the other electric drive unit, a vibration isolation structure similar to the vibration isolation structure 31 (FIG. 2B, FIG. 2C) Can be applied. Examples of the electric drive unit to be controlled include inverters 113A and 113B. Furthermore, examples of the electric drive unit to be controlled include a part other than the power storage device 30 in the power storage circuit 112, for example, a step-up / step-down converter that boosts / lowers the output of the power storage device 30.

  Next, with reference to FIG. 8A-FIG. 8C, the vibration isolating structure 31 by another Example is demonstrated. Hereinafter, differences from the vibration isolation structure 31 according to the embodiment shown in FIGS. 2A to 2B will be described, and the description of the same configuration will be omitted.

  FIG. 8A shows a cross-sectional view of the vibration isolating structure 31, the turning frame 12A, and the housing 40 before the power storage device 30 is attached to the turning frame 12A. A through hole 39 for passing the bolt 36A is provided in the turning frame 12A. The bolt 36A penetrates the through hole 39 from below to above. A bolt support member 38 is welded to the bottom surface of the turning frame 12A. The bolt support member 38 includes the through hole 39 in a plan view, and forms a cavity 46 between the bottom surface of the swivel frame 12A. The head of the bolt 36 </ b> A is accommodated in the cavity 46. The bolt support member 38 prevents the bolt 36A from dropping from the turning frame 12A.

  The through hole 39 is larger than the cross section of the shaft of the bolt 36A, and the cavity 46 is larger than the head of the bolt 36A. The bolt support member 38 allows the movement of the bolt 36A in the horizontal direction within a certain range, and a space is secured in the horizontal position of the bolt 36A with respect to the turning frame 12A.

  The configuration of the first elastic member 32, the first washer 34, the second washer 35, and the second elastic member 33 is the same as the configuration of the vibration isolation structure 31 shown in FIG. 2B.

  FIG. 8B shows a cross-sectional view of the vibration isolating structure 31 in the middle of the mounting operation. At the four locations where the vibration isolation structure 31 shown in FIG. 2A is disposed, the first elastic member 32 and the first washer 34 are arranged on the swivel frame 12A so that the bolts 36A pass through the first through holes of the first elastic member 32 and the first washer 34. The elastic member 32 and the first washer 34 are stacked. The housing 40 is positioned and lowered so that the bolt 36 </ b> A penetrates the through hole of the mounting foot 41 of the housing 40. Thereafter, the second washer 35 and the second elastic member 33 are stacked on the mounting foot 41 so that the bolt 36 </ b> A passes through the through holes of the second washer 35 and the second elastic member 33.

  As shown in FIG. 8C, a nut 36B is fastened to the tip of the bolt 36A. As a result, the stacked structure 37 including the turning frame 12A, the first elastic member 32, the first washer 34, the attachment foot 41, the second washer 35, and the second elastic member 33 is tightened in the stacking direction.

  In the embodiment shown in FIG. 2B, when the bolt 36A is passed through the stacked structure 37, the bolt 36A must be supported from below. When the bolt 36A is passed from above to below, the nut 36B must be supported from below. The excavator upper swing body 12 (FIG. 1) includes many components such as the engine 110, the motor generator 111, the inverters 113A and 113B, the swing motor 102, and the main pump 122 (FIG. 7). It is difficult to secure a sufficiently large space for mounting 30. For this reason, when attaching the electrical storage device 30 to the turning frame 12A, it is difficult to secure a sufficient space for supporting the bolt 36A or the nut 36B from below, and workability is poor.

  In the embodiment shown in FIGS. 8A to 8C, the bolt 36 </ b> A is supported by the bolt support member 38, so that it is not necessary to support the bolt 36 </ b> A from below during the mounting operation of the power storage device 30. For this reason, work efficiency can be improved.

  Further, in the embodiment shown in FIGS. 8A to 8C, the bolt 36 </ b> A has a space before being attached. For this reason, the through-hole formed in the attachment leg 41 of the housing | casing 40 and the volt | bolt 36A can be aligned easily.

  In the embodiment shown in FIGS. 8A to 8C, the bolt support member 38 is fixed by welding to the swing frame 12A. However, as shown in FIG. 9, the bolt support member 38 is fixed to the swing frame 12A by a bolt 50. Also good.

  Next, still another embodiment will be described with reference to FIGS. 10A and 10B. Hereinafter, differences from the embodiment shown in FIGS. 2A and 2B will be described, and description of the same configuration will be omitted.

  As shown in FIG. 10A, the housing 40 of the power storage device 30 is attached to the bracket 47 by the vibration isolation structure 31 at the portion of the attachment foot 41. The anti-vibration structure 31 has the same configuration as the anti-vibration structure 31 shown in FIG. 2B or 2C. In the embodiment shown in FIG. 10A, a bracket 47 is arranged instead of the turning frame 12A shown in FIG. 2B or 2C. A plurality of through holes 45 are formed in the bracket 47. Bolts 48 are inserted into the through-holes 45 from above to below. A plurality of screw holes 49 are formed on the upper surface of the turning frame 12 </ b> A so as to correspond to the through holes 45 of the bracket 47.

  As shown in FIG. 10B, the bolts 48 and the screw holes 49 are aligned, and the power storage device 30 and the bracket 47 are lowered toward the turning frame 12A. The power storage device 30, the vibration isolation structure 31, and the bracket 47 constitute one subassembly. The bracket 47 is fixed to the revolving frame 12A by fitting the bolt 48 into the screw hole 49 and tightening it. The housing 40 of the power storage device 30 is attached to the turning frame 12 </ b> A via the vibration isolation structure 31 and the bracket 47.

  In the embodiment shown in FIGS. 10A and 10B, the bolt 48 is supported by the bracket 47 in a state before being attached. Therefore, it is not necessary to support the bolt 48 from below during the assembly operation. 10A and 10B, as in the embodiment shown in FIGS. 8A to 8C, the working efficiency when attaching the power storage device 30 to the turning frame 12A can be improved.

  Although the present invention has been described with reference to the embodiments, the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications, improvements, combinations, and the like can be made.

DESCRIPTION OF SYMBOLS 10 Lower traveling body 11 Slewing bearing 12 Upper revolving body 12A Swivel frame 12B Cover 12C Cabin 15 Boom 16 Arm 17 Bucket 18 Boom cylinder 19 Arm cylinder 20 Bucket cylinder 30 Power storage device 31 Anti-vibration structure 32 1st elastic member 33 2nd Elastic member 34 First washer 35 Second washer 36 Fastener 36A Bolt 36B Nut 37 Stacked structure 38 Bolt support member 39 Through hole 40 Housing 41 Mounting foot 42 Lower housing 43 Lid 44 Fastener 45 Through hole 46 Bolt 47 Bracket 48 Bracket 49 Screw hole 50 Bolt 51 Bottom surface 52 Side surface 55 First rib 56 Second rib 57 Third rib 58 Opening 59 Connector box 60 Power storage module 61 Relay member 62 Relay circuit 63 Terminal 64 Electrical circuit component 65 Bus bar 66 ba Sub bar 70 Power storage cell 71 Heat transfer plate 72 Electrode tab 73 Pressure plate 74 Tie rod 76 Pressure mechanism 77, 78 Flow path 102 Swing motor 109A, 109B Hydraulic motor 110 Engine 111 Motor generator 112 Power storage circuit 113A, 113B Inverter 121 Torque transmission mechanism 122 Main pump 123 High pressure hydraulic line 124 Control valve 125 Pilot pump 126 Pilot line 127 Pressure sensor 128 Operating device 129, 130 Hydraulic line 131 Reducer 132 Resolver 133 Mechanical brake 135 Control device

Claims (1)

A swivel frame that is pivotably mounted on the lower traveling body,
An electric drive unit including a fastening portion extending outward from a housing portion, wherein the fastening portion is attached to the swivel frame via a vibration isolation structure;
A bracket attached to the electric drive unit via the vibration isolation structure;
The vibration isolation structure includes a first elastic member, a second elastic member, and a fastener,
The bracket, the first elastic member, the fastening portion, and the second elastic member are stacked in this order to form a stacked structure, and the fastener is configured to stack the stacked structure in the stacking direction. And tighten to
The electric drive unit, the vibration damping system, and wherein the bracket constitutes a sub-assembly, shovel the bracket is fixed to the rotating frame by tightening the bolts inserted downward from above.

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