Shovel

Abstract

Simplify the structure of the shovel. [Solution] The excavator comprises an upper rotating body having a power source, a lower traveling body having an actuator supplied with power from the power source and a driver that drives the actuator, and a slip ring that rotatably connects the upper rotating body and the lower traveling body and electrically connects the power source and the driver.

Description

Technical Field

[0001] The present invention relates to an excavator.

Background Art

[0002] Patent Document 1 discloses a technique in which a swivel joint is interposed at a position between an upper revolving body having a machine room and a lower traveling body having a lower frame in a hydraulic excavator. The swivel joint of Patent Document 1 is interposed in a fuel circuit to which an engine and a fuel tank are connected. Patent Document 1 does not disclose a technique related to a slip ring (equivalent to an electrical swivel joint).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In an excavator equipped with a slip ring, depending on the location of the driver that drives the actuator, the number of ports of the slip ring may increase. In this case, the number of wirings connected to the slip ring increases, and the structure of the excavator is likely to become complicated.

[0005] Therefore, an object of the present invention is to provide an excavator capable of simplifying the structure.

Means for Solving the Problems

[0006] An excavator according to one aspect of the present invention comprises an upper rotating body having a power source, a lower traveling body having an actuator supplied with power from the power source and a driver that drives the actuator, and a slip ring that rotatably connects the upper rotating body and the lower traveling body and electrically connects the power source and the driver. [Effects of the Invention]

[0007] According to the above embodiment, the structure of the shovel can be simplified. [Brief explanation of the drawing]

[0008] [Figure 1] Left side view of the shovel according to the first embodiment. [Figure 2] A perspective view of the excavator according to the first embodiment, with the work implement removed, seen from the upper right front. [Figure 3] Block diagram of the electrical circuit of the excavator according to the first embodiment. [Figure 4] A perspective view of the lower traveling body according to the first embodiment, seen from the left rear. [Figure 5] A perspective view of the center frame according to the first embodiment, seen from the upper left rear. [Figure 6] A bottom view showing the center frame according to the first embodiment with the outer panel on the lower side removed. [Figure 7] A perspective view showing the arrangement of the driver according to the first embodiment. [Figure 8] A diagram showing the driver arrangement for the comparative example. [Figure 9] A diagram showing the driver arrangement according to the first embodiment. [Figure 10] A perspective view of the lower traveling body according to the second embodiment, seen from the upper left, showing the internal structure of the left portion. [Figure 11] A perspective view of the lower traveling body according to the second embodiment, seen from the lower left. [Figure 12] A top view of the lower traveling body according to the second embodiment, showing the internal structure of the left portion. [Figure 13]Perspective view of the lower traveling body according to the third embodiment, as seen from the upper left, showing the internal structure of the left side portion. [Figure 14] Perspective view of the lower traveling body according to the third embodiment, as seen from the lower left. [Figure 15] Top view of the lower traveling body according to the third embodiment, showing the internal structure of the left side portion. [Figure 16] Perspective view of the lower traveling body according to the fourth embodiment, as seen from the upper left, showing the internal structure of the left side portion. [Figure 17] Perspective view of the lower traveling body according to the fourth embodiment, as seen from the lower left. [Figure 18] Top view of the lower traveling body according to the fourth embodiment, showing the internal structure of the left side portion. [Figure 19] Perspective view showing an example of the arrangement of the driver inside the side frame. [Figure 20] Perspective view showing an example of the arrangement of the driver inside the connection part.

Modes for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiments, as an excavator, a full-electric power excavator in which the main power and actuators (working machines, traveling motors, etc.) are electric will be described as an example.

[0010] In the following description, expressions indicating relative or absolute arrangements such as "parallel", "orthogonal", "center", "coaxial", etc. not only strictly mean such arrangements and states, but also include arrangements and states that are relatively displaced with tolerances and angles and distances that can obtain the same function. In the drawings used in the following description, the scales of each member may be appropriately changed to show each member in a recognizable size.

[0011] <First Embodiment> FIG. 1 is a left side view of the excavator 1 according to the first embodiment. FIG. 2 is a perspective view of the excavator 1 according to the first embodiment as viewed from the upper right front with the working machine 10 removed. FIG. 3 is a block diagram of the electric circuit of the excavator 1 according to the first embodiment. In FIG. 1, a part of the exterior of the excavator 1 is shown with omission. Referring to FIGS. 1 to 3 together, the excavator 1 includes an upper revolving structure 2 having a battery 20 (power source), actuators 35A, 35B, 35C to which power is supplied from the battery 20, and drivers 45A, 45B, 45C for driving the actuators 35A, 35B, 35C, a lower traveling body 3, a slip ring 4 that connects the upper revolving structure 2 and the lower traveling body 3 in a pivotable manner and electrically connects the battery 20 and the drivers 45A, 45B, 45C.

[0012] Hereinafter, the forward direction, backward direction, and vehicle width direction of the excavator 1 are referred to as "vehicle front (one side of the vehicle longitudinal direction)", "vehicle rear (the other side of the vehicle longitudinal direction)", and "vehicle width direction". The vehicle width direction may also be referred to as "left side (one side of the vehicle width direction)" or "right side (the other side of the vehicle width direction)". The right hand is referred to as the right side with respect to the direction in which the excavator 1 advances, and the left hand is referred to as the left side with respect to the direction in which the excavator 1 advances. The vertical direction, upper side, and lower side in the state where the excavator 1 is disposed on a horizontal plane are simply referred to as "vertical direction", "upper side", and "lower side".

[0013] The upper revolving structure 2 is provided on the lower traveling body 3 so as to be pivotable. The upper revolving structure 2 is provided on the upper part of the lower traveling body 3. The upper revolving structure 2 is provided with a battery 20 serving as a power source, a controller 21 (control unit), a driver (not shown) for the electric cylinders 14A, 14B, 14C, 14D of the working machine ; a DC-AC inverter 22 (for the driver of the motors of the electric cylinders 14A, 14B, 14C, 14D), a swing motor 23, etc. The upper revolving structure 2 is capable of pivoting around a pivot center (around the center of the slip ring 4) with respect to the lower traveling body 3. The upper revolving structure 2 pivots with respect to the lower traveling body 3 when the swing motor 23 is driven. The upper revolving structure 2 has a controller 21 that controls the actuators 35A, 35B, 35C.

[0014] For example, the operation method of shovel 1 may be unmanned or manned. In the case of manned operation, a driver's cab may be provided in the upper rotating body 2. For example, the driver's cab may be equipped with a seat for the operator of shovel 1, as well as levers, pedals, and instruments for various operations. The configuration of the driver's cab can be changed according to the design specifications.

[0015] A work implement 10 is connected to the upper slewing body 2. The work implement 10 is located at the front of the upper slewing body 2. The work implement 10 is mounted so as to be able to bend and raise relative to the upper slewing body 2. The work implement 10 (boom 11) is rotatable around an axis extending in the left-right direction relative to the upper slewing body 2, and is also oscillating (swinging) around an axis extending in the up-down direction.

[0016] The work machine 10 comprises a boom 11, an arm 12, a bucket 13 (working tool), and a number of (for example, four) electric cylinders 14A, 14B, 14C, and 14D. The four electric cylinders 14A, 14B, 14C, and 14D are a swing cylinder 14A that swings the boom 11, a boom cylinder 14B that operates the boom 11 (rotating it around an axis extending in the left-right direction), an arm cylinder 14C that operates the arm 12, and a bucket cylinder 14D that operates the bucket 13. The base end of the boom 11 is rotatably connected to the upper slewing body 2. The tip of the boom 11 is rotatably connected to the base end of the arm 12. The tip of the arm 12 is rotatably connected to the bucket 13.

[0017] The lower vehicle 3 is configured to be self-propelled. The lower vehicle 3 comprises a center frame 30, a pair of left and right tracks 31L and 31R, and actuators 35A and 35B (e.g., electric motors) that drive the tracks 31L and 31R. The lower vehicle 3 moves when the tracks 31L and 31R are driven by the left and right drive motors 35A and 35B.

[0018] A blade 32 is provided at the front of the lower traveling body 3. The blade 32 functions as a dozer blade extending in the vehicle width direction of the lower traveling body 3. The lower traveling body 3 is equipped with an actuator 35C (e.g., an electric motor) that drives the blade 32. The height position of the blade 32 may be adjustable by driving the actuator 35C (blade motor 35C).

[0019] The slip ring 4 is positioned between the upper slewing body 2 and the lower traveling body 3. The slip ring 4 extends vertically so as to penetrate both the upper slewing body 2 and the lower traveling body 3. Control signals and drive power are supplied from the upper slewing body 2 to the lower traveling body 3 via the slip ring 4. The slip ring 4 electrically connects the controller 21 and the drivers 45A, 45B, and 45C.

[0020] Power buses 40A and 40B extend from the upper rotating body 2 to the lower traveling body 3 via slip rings 4. One end of power buses 40A and 40B is connected to the battery 20 in the upper rotating body 2. Power buses 40A and 40B are connected to the drivers in the upper rotating body 2 and to each of the drivers 45A, 45B, and 45C included in the lower traveling body 3. With this configuration, drive power is supplied from the battery 20 in the upper rotating body 2 to the drivers 45A, 45B, and 45C in the lower traveling body 3 via slip rings 4. For example, another battery (e.g., a battery cell) or capacitor may be connected to the other end or in the middle (the portion between one end and the other end of power buses 40A and 40B). This makes it possible to reduce the size of the battery 20 in the upper rotating body 2.

[0021] The controller 21 is connected to each actuator via each driver using bus communication (communication lines 41), such as CAN (Controller Area Network) communication. With this configuration, the number of communication lines 41 can always be the same (for example, 4 lines in the case of CAN communication), regardless of the number of devices on the lower traveling body 3. For example, the controller 21 may be connected not only to one end of the communication line 41, but also to the other end or in the middle of the communication line 41 (the part between one end and the other end of the communication line 41). The connection configuration of the controller 21 can be changed according to the design specifications.

[0022] The actuators in the upper slewing body 2 include electric cylinders 14A to 14D for the boom 11, arm 12, and bucket 13, as well as the slewing motor 23. The actuators 35A, 35B, and 35C in the lower traveling body 3 consist of left and right traveling motors 35A and 35B, and a motor 35C for the blade. Drivers 45A, 45B, and 45C are provided on the wiring connecting the slip ring 4 and the actuators 35A, 35B, and 35C in the lower traveling body 3.

[0023] Excavator 1 includes drivers 45A, 45B, and 45C that drive actuators 35A, 35B, and 35C, and connectors 46 that connect the drivers 45A, 45B, and 45C to the actuators 35A, 35B, and 35C. The drivers 45A, 45B, and 45C and connectors 46 are located on the lower traveling body 3.

[0024] The drivers 45A, 45B, and 45C consist of a left-hand drive driver 45A that controls the left-hand drive motor 35A in the left-right direction of the vehicle, a right-hand drive driver 45B that controls the right-hand drive motor 35B in the left-right direction of the vehicle, and a blade driver 45C that controls the blade 32.

[0025] Figure 4 is a perspective view of the lower traveling body 3 according to the first embodiment, viewed from the left rear. Figure 5 is a perspective view of the center frame 30 according to the first embodiment, viewed from the left rear upper. Figure 6 is a bottom view showing the center frame 30 according to the first embodiment with the outer panel on the lower side removed. Figure 7 is a perspective view showing the arrangement of drivers 45A, 45B, and 45C according to the first embodiment. Figures 4 to 6 omit illustrations of work equipment and the like. Referring to Figures 4 to 7, the lower running body 3 comprises a center frame 30 that supports the slip ring 4, and side frames 33 that are located on both sides in the vehicle width direction relative to the center frame 30 and support the tracks 31L and 31R.

[0026] The drivers 45A, 45B, and 45C are located inside the center frame 30 or the side frame 33. For example, the internal space of the center frame 30 or the side frame 33 may be provided with wiring (not shown) connected to the slip ring 4, the drivers 45A, 45B, and 45C and / or the actuators 35A, 35B, and 35C.

[0027] The center frame 30 has a main body 60 that supports the slip ring 4 and a connecting portion 61 that connects the main body 60 and the side frame 33. The drivers 45A, 45B, and 45C are located inside the main body 60. The drivers 45A, 45B, and 45C are located in front of or behind the slip ring 4 in the longitudinal direction of the vehicle.

[0028] The center frame 30 is X-shaped in plan view. The connecting section 61 includes a pair of legs 62L, 62R, 63L, and 63R that branch off from the main body 60 in the vehicle's front-rear direction in plan view. The legs 62L, 62R, 63L, and 63R connect the left-right outer parts of the main body 60 to the left-right inner parts of the side frames 33. The front and rear pair of legs 62L, 62R, 63L, and 63R extend such that the distance between them in the front-rear direction increases as they move from the main body 60 toward the side frames 33 in plan view. Wiring (shown as dashed lines in Figure 6) connected to the left and right travel motors 35A and 35B may be provided in the internal space of the rear pair of legs 63L and 63R.

[0029] A blade 32 (an example of a work implement) is connected to the front of the main body 60. Drivers 45A, 45B, and 45C are positioned behind the slip ring 4. A blade connection section 34 is provided at the front of the main body 60. An extension section 50 is provided at the rear of the main body 60. The extension section 50 is located on the opposite side from the blade connection section 34 in the vehicle's longitudinal direction.

[0030] The extension 50 is formed by extending the outer panels on the upper and side surfaces of the center frame 30 and includes a first wall portion 51 that covers the drivers 45A, 45B, and 45C from above in the vertical direction of the vehicle and from both sides in the left-right direction of the vehicle; a second wall portion 52 that is formed by extending the outer panel on the lower surface of the center frame 30 and covers the drivers 45A, 45B, and 45C from below in the vertical direction of the vehicle; and a third wall portion 53 that is connected to the first wall portion 51 and the second wall portion 52 and covers the drivers 45A, 45B, and 45C from the rear in the front-rear direction of the vehicle.

[0031] The extension 50 is formed by extending a part of the main body 60. The extension 50 is formed by joining together a first metal wall 51, which is formed by extending the outer plates on the upper and side sides of the main body 60, a second metal wall 52, which is formed by extending the outer plate on the lower side of the main body 60, and a third metal wall 53, by welding or the like.

[0032] For example, the thicknesses (plate thicknesses) of the first wall portion 51, the second wall portion 52, and the third wall portion 53 may be the same or different. If the thicknesses are different, for example, the thickness of the first wall portion 51 may be 10 mm or more and 14 mm or less. In this case, the thicknesses of the second wall portion 52 and the third wall portion 53 may be 6 mm or more and less than 10 mm. The thicknesses of the first wall portion 51, the second wall portion 52, and the third wall portion 53 are not limited to the above and can be changed according to the design specifications. In this embodiment, an example is described in which the extension portion 50 is formed by extending a part of the main body portion 60, but it is not limited to this.

[0033] Drivers 45A, 45B, and 45C are installed in a watertight manner in the lower traveling body 3. Watertight means that no liquid will flow into the interior under pressure. Drivers 45A, 45B, and 45C are installed in a watertight manner by being positioned inside the main body 60, which is formed by welding metal walls 51, 52, and 53 to each other, so as not to allow any liquid to flow into the main body 60.

[0034] For example, each driver 45A, 45B, 45C may be formed in a rectangular parallelepiped shape. The left and right travel drivers 45A, 45B may be arranged on the second wall portion 52. The blade driver 45C may be arranged on the right travel driver 45B. Space for optional equipment may be formed on the left travel driver 45A. For example, multiple drivers 45A, 45B, 45C may be arranged in a distributed manner. For example, at least one of the multiple drivers 45A, 45B, 45C may be arranged in a space within the side frame 33. The shape and / or arrangement of each driver 45A, 45B, 45C is not limited to the above and can be changed according to the design specifications.

[0035] Figure 8 shows the driver arrangement according to a comparative example. Figure 9 shows the driver arrangement according to the first embodiment. As shown in Figure 8, in the comparative example, the driver is located on the upper slewing body and the actuator is located on the lower traveling body, so the slip ring connects the driver on the upper slewing body and the actuator on the lower traveling body. Therefore, the number of ports and the number of wires connected to the slip ring in the comparative example are determined according to the number of components in which the driver is installed on the upper slewing body and the actuator is installed on the lower traveling body. As the number of components in which the driver is installed on the upper slewing body and the actuator is installed on the lower traveling body increases, the number of ports on the slip ring and the number of wires connected to the slip ring also increase. As a result, the excavator in the comparative example has a complex structure.

[0036] In contrast, in this embodiment, as shown in Figure 9, the driver and actuator are located on the lower travel body, so the slip ring in this embodiment does not need to connect the driver and actuator. Instead, the slip ring in this embodiment connects the battery located on the upper slewing body to one driver included in the lower travel body. Therefore, the slip ring in this embodiment can have fewer ports and fewer wires connected to the slip ring compared to the slip ring in the comparative example. As a result, the structure of the excavator can be simplified.

[0037] Furthermore, the slip ring of this embodiment does not depend on the number of ports or connected wires, nor on the number of drivers or actuators located on the lower travel body. Therefore, even if the number of drivers or actuators located on the lower travel body increases, the number of ports on the slip ring remains unchanged, as does the number of wires connected to the slip ring. As a result, the structure of the excavator can be simplified.

[0038] As described above, because the slip ring in this embodiment uses bus communication, the number of ports on the slip ring and the connected wiring do not change even if the number of drivers and actuators included in the lower vehicle increases. For example, even if the number of actuators in the lower vehicle increases due to optional additions, the same slip ring can be used.

[0039] In the example shown in Figure 8, the upper rotating body is equipped with left and right drive drivers and blade drivers. Power lines (DC) from the battery and communication lines (CAN, etc.) from the controller are connected to each driver. Power lines (AC) and signal lines (resolver, temperature) from each driver are connected via slip rings to each actuator (left and right drive motors and blade motor, indicated by M in the figure) on the lower traveling body. There is three-phase wiring between each driver and each motor, corresponding to the U, V, and W phases. In the example shown in Figure 9, the lower traveling body is equipped with left and right drive drivers and blade drivers. Power lines (DC) from the battery and communication lines (CAN, etc.) from the controller are connected via slip rings to each driver on the lower traveling body. Power lines (AC) and signal lines (resolver, temperature) from each driver are connected to each actuator (left and right drive motors and blade motor, indicated by M in the figure) on the lower traveling body. There is three-phase wiring between each driver and each motor, corresponding to the U, V, and W phases. The number of wires shown in Figures 8 and 9 is just an example and can be changed according to the design specifications.

[0040] <Effects and Effects> As described above, the excavator 1 of this embodiment comprises an upper slewing body 2 having a battery 20, a lower traveling body 3 having actuators 35A, 35B, 35C supplied with power from the battery 20 and drivers 45A, 45B, 45C that drive the actuators 35A, 35B, 35C, and a slip ring 4 that rotatably connects the upper slewing body 2 and the lower traveling body 3 and electrically connects the battery 20 and the drivers 45A, 45B, 45C. For example, as shown in Figure 8, if each driver is located on the upper rotating body, the number of ports on the slip ring may increase. In this case, the number of wires connected to the slip ring increases, which can make the structure of the excavator more complex. In contrast, with this configuration, since each driver 45A, 45B, and 45C is positioned on the lower travel body 3, the number of wires connecting the slip ring 4 and the drivers 45A, 45B, and 45C can be reduced. Therefore, the structure of the shovel 1 can be simplified.

[0041] In this embodiment, the upper rotating body 2 has a controller 21 that controls the actuators 35A, 35B, and 35C. The slip ring 4 electrically connects the controller 21 to the drivers 45A, 45B, and 45C. With this configuration, the controller 21 provided on the upper rotating body 2 can control the actuators 35A, 35B, and 35C located on the lower traveling body 3 via the slip ring 4.

[0042] In this embodiment, the lower running body 3 comprises a center frame 30 that supports the slip ring 4, and side frames 33 that are located on both sides in the vehicle width direction relative to the center frame 30 and support the tracks 31L and 31R. The drivers 45A, 45B, and 45C are positioned inside the center frame 30 or the side frames 33. With this configuration, the drivers 45A, 45B, and 45C are surrounded by the center frame 30 or side frames 33, thereby protecting them from external factors. For example, the waterproof and dustproof properties of the drivers 45A, 45B, and 45C can be improved.

[0043] In this embodiment, the center frame 30 has a main body portion 60 that supports the slip ring 4. The drivers 45A, 45B, and 45C are arranged inside the main body portion 60. With this configuration, the main body 60 of the center frame 30 can be used as the installation location for the drivers 45A, 45B, and 45C. For example, the unused cavity inside the main body 60 can be used to protect the drivers 45A, 45B, and 45C from external factors.

[0044] In this embodiment, the drivers 45A, 45B, and 45C are positioned in front of or behind the slip ring 4 in the longitudinal direction of the vehicle. With this configuration, the front or rear of the slip ring 4 in the longitudinal direction of the vehicle can be used as the installation location for the drivers 45A, 45B, and 45C.

[0045] In this embodiment, the blade 32 is connected to the front of the main body 60. The drivers 45A, 45B, and 45C are positioned behind the slip ring 4. With this configuration, since the blades 32 are not connected behind the slip ring 4, it is easier to secure a larger space, making it suitable for positioning the drivers 45A, 45B, and 45C.

[0046] In this embodiment, the drivers 45A, 45B, and 45C are installed in a watertight manner on the lower traveling body 3. This configuration enhances the waterproofing of drivers 45A, 45B, and 45C.

[0047] In this embodiment, as shown in Figure 7, the extension portion 50 is formed by extending the outer panels on the upper and side surfaces of the center frame 30 and includes a first wall portion 51 that covers the drivers 45A, 45B, and 45C from above in the vertical direction of the vehicle and from both sides in the left-right direction of the vehicle; a second wall portion 52 that is formed by extending the outer panel on the lower surface of the center frame 30 and covers the drivers 45A, 45B, and 45C from below in the vertical direction of the vehicle; and a third wall portion 53 that is connected to the first wall portion 51 and the second wall portion 52 and covers the drivers 45A, 45B, and 45C from the rear in the front-rear direction of the vehicle. This configuration allows the outer panel of the center frame 30 to be extended in the front-rear direction, securing installation space for drivers 45A, 45B, and 45C while protecting them from external factors.

[0048] In this embodiment, the drivers 45A, 45B, and 45C are configured to include a left-travel driver 45A that controls the left-side travel motor 35A in the left-right direction of the vehicle, a right-travel driver 45B that controls the right-side travel motor 35B in the left-right direction of the vehicle, and a blade driver 45C that controls the blade 32. This configuration reduces the number of wires connecting the slip ring 4 to each driver 45A, 45B, and 45C. Therefore, the structure of the shovel 1 can be simplified.

[0049] <Second Embodiment> Figure 10 is a perspective view of the lower traveling body according to the second embodiment, viewed from the upper left, showing the internal structure of the left portion. Figure 11 is a perspective view of the lower traveling body according to the second embodiment, viewed from the lower left. Figure 12 is a top view of the lower traveling body according to the second embodiment, showing the internal structure of the left portion. Hereinafter, the excavator according to the second embodiment will be described with reference to Figures 10 to 12. In the configuration shown in Figures 10 to 12, components similar to those in the above-described embodiment are denoted by the same reference numerals, and their detailed descriptions are omitted.

[0050] The center frame 230 comprises a main body 260 that supports the slip ring 4 and a connecting portion 261 that connects the main body 260 to the side frame 33. Inside the main body 260 or the connecting portion 261, there is space in which drivers 45A, 45B, and 45C can be arranged. For example, a battery cell or capacitor may be housed in the space inside the main body 260 or the connecting portion 261, or at least one of the drivers 45A, 45B, and 45C may be housed. This makes it possible to fill the space inside the main body 260 or the connecting portion 261 without waste.

[0051] The connecting section 261 includes a pair of legs 262L, 262R, 263L, and 263R that branch off from the main body 260 in the front-rear direction of the vehicle when viewed from above. Inside the pair of legs 262L, 262R, 263L, and 263R, there is space for arranging drivers 45A, 45B, and 45C.

[0052] For example, the connecting portion 261 may include a front overhang 264 that extends forward along the outer edges of the front left and right pair of legs 262L, 262R, or it may include a rear overhang 265 that extends backward along the outer edges of the rear left and right pair of legs 263L, 263R. For example, the connecting portion 261 may include a left overhang 266L that extends to the left along the outer edges of the left front and rear pair of legs 262L, 263L, or it may include a right overhang 266R that extends to the right along the outer edges of the right front and rear pair of legs 262R, 263R. The configuration of the connecting portion 261 is not limited to the above and can be changed according to the design specifications.

[0053] For example, if there is ample space between a pair of legs 262L, 262R, 263L, 263R, a battery cell or capacitor may be housed in the space between the pair of legs 262L, 262R, 263L, 263R, or at least one of a plurality of drivers 45A, 45B, 45C may be housed in the space between the pair of legs 262L, 262R, 263L, 263R. This allows for effective use of the space between the pair of legs 262L, 262R, 263L, 263R.

[0054] For example, if there is unused space inside the side frame 33, battery cells or capacitors may be housed in that space, or at least one of the multiple drivers 45A, 45B, and 45C may be housed in it. This makes it possible to fill the space inside the side frame 33 without wasting any space.

[0055] The center frame 230 has an opening 251h for inserting and removing drivers 45A, 45B, and 45C. The center frame 230 with the opening 251h is provided with a cover portion 252 to close the opening 251h.

[0056] The opening 251h is formed in the main body portion 260 of the center frame 230. The lid portion 252 is detachably attached to the main body portion 260. The main body portion 260 is composed of a bottom wall portion 251a formed in an annular shape in plan view, a peripheral wall portion 251b rising upward from the outer peripheral edge of the bottom wall portion 251a, and an upper wall portion 251c extending inward from the upper edge of the peripheral wall portion 251b and formed in an annular shape in plan view. The internal space of the main body portion 260 is the space enclosed by the bottom wall portion 251a, the peripheral wall portion 251b, the upper wall portion 251c, and the lid portion 252. For example, wiring (dashed lines in the figure) connected to the slip ring 4, drivers 45A, 45B, 45C and / or actuators 35A, 35B, 35C may be provided in the internal space of the main body portion 260. For example, the main body 260 may surround the drivers 45A, 45B, 45C, etc., with the upper surface of the bottom wall 251a, the inner surface of the peripheral wall 251b, the lower surface of the upper wall 251c, and the upper surface of the lid 252.

[0057] The main body 260 has a space inside which drivers 45A, 45B, and 45C can be placed. The opening 251h is formed by opening the bottom wall 251a of the main body 260 in the vertical direction. The opening 251h is circular in shape when viewed from above.

[0058] The lid portion 252 is detachably connected to the main body portion 260 via fastening members such as bolts. The lid portion 252 is formed in a circular shape with a size greater than or equal to the opening 251h when viewed from above. For example, with the lid portion 252 superimposed on the opening 251h when viewed from above, the lid portion 252 can be connected to the main body portion 260 by inserting a bolt through a through hole formed on the outer circumference of the lid portion 252 and screwing it into the female thread of a bracket provided on the bottom wall portion 251a of the main body portion 260.

[0059] The implement 10 is connected to the upper rotating body 2. The blade 32 (implement) is not connected to the center frame 230 of the lower traveling body 3. The center frame 230 does not have a blade connection section 34.

[0060] Drivers 45A, 45B, and 45C are installed in a watertight manner on the lower traveling body 3. Drivers 45A, 45B, and 45C are installed in a watertight manner so as not to allow liquid to flow into the main body 260, by being positioned inside the main body 260, which is surrounded by the bottom wall portion 251a, the peripheral wall portion 251b, the upper wall portion 251c, and the lid portion 252. For example, drivers 45A, 45B, and 45C may be installed in a watertight manner inside the main body 260 by fastening the lid portion 252 to the main body 260 with bolts via a rubber packing (an example of an elastic member).

[0061] In this embodiment, the center frame 230 has a main body portion 260 that supports the slip ring 4 and a connecting portion 261 that connects the main body portion 260 and the side frame 33. The drivers 45A, 45B, and 45C are arranged inside the main body portion 260 or the connecting portion 261. With this configuration, the main body 260 or the connecting part 261 of the center frame 230 can be used as the installation location for the drivers 45A, 45B, and 45C. For example, the unused cavity inside the main body 260 or the connecting part 261 can be used to protect the drivers 45A, 45B, and 45C from external factors.

[0062] In this embodiment, drivers 45A, 45B, and 45C are arranged inside the side frame 33. With this configuration, the side frame 33 can be used as a mounting location for drivers 45A, 45B, and 45C. For example, the unused cavity inside the side frame 33 can be used to protect drivers 45A, 45B, and 45C from external factors.

[0063] In this embodiment, the center frame 230 has an opening 251h for inserting and removing drivers 45A, 45B, and 45C. The center frame 230, in which the opening 251h is formed, is equipped with a cover portion 252 that closes the opening 251h. With this configuration, when the opening 251h is closed by the cover 252, the drivers 45A, 45B, and 45C can be protected from external factors. On the other hand, when the cover 252 is removed and the opening 251h is open, the drivers 45A, 45B, and 45C can be inspected.

[0064] In this embodiment, the drivers 45A, 45B, and 45C are installed in a watertight manner on the lower traveling body 3. This configuration enhances the waterproofing of drivers 45A, 45B, and 45C.

[0065] In this embodiment, the work implement 10 is connected to the upper rotating body 2, and the blade 32 (work implement) is not connected to the center frame 230. The drivers 45A, 45B, and 45C are located inside the center frame 230 or the side frame 33. With this configuration, the center frame 230 or the side frame 33 can be used as the installation location for the drivers 45A, 45B, and 45C. The center frame 230 is suitable for arranging the drivers 45A, 45B, and 45C because it is easier to secure a larger space since no work equipment is connected to it.

[0066] <Third Embodiment> Figure 13 is a perspective view of the lower traveling body according to the third embodiment, viewed from the upper left, showing the internal structure of the left portion. Figure 14 is a perspective view of the lower traveling body according to the third embodiment, viewed from the lower left. Figure 15 is a top view of the lower traveling body according to the third embodiment, showing the internal structure of the left portion. Hereinafter, the excavator according to the third embodiment will be described with reference to Figures 13 to 15. In the configuration shown in the figures, the same reference numerals are used for components similar to those in the embodiments described above, and their detailed descriptions are omitted.

[0067] The center frame 330 comprises a main body 360 that supports the slip ring 4 and a connecting portion 361 that connects the main body 360 to the side frame 33. Inside the main body 360 or the connecting portion 361, there is space in which drivers 45A, 45B, and 45C can be arranged. For example, a battery cell or capacitor may be housed in the space inside the main body 360 or the connecting portion 361, or at least one of the drivers 45A, 45B, and 45C may be housed. This makes it possible to fill the space inside the main body 360 or the connecting portion 361 without waste.

[0068] For example, if there is unused space inside the side frame 33, battery cells or capacitors may be housed in that space, or at least one of the multiple drivers 45A, 45B, and 45C may be housed in it. This makes it possible to fill the space inside the side frame 33 without wasting any space.

[0069] The center frame 330 has an opening 351h for inserting and removing drivers 45A, 45B, and 45C. The center frame 330 with the opening 351h is provided with a cover portion 352 to close the opening 351h.

[0070] The opening 351h is formed in the main body portion 360 of the center frame 330. The lid portion 352 is detachably provided with respect to the main body portion 360. The main body portion 360 is composed of a bottom wall portion 351a, which in plan view has an outer edge formed in the shape of an octagonal frame, a side wall portion 351b that rises upward from the outer edge of the bottom wall portion 351a, and an upper wall portion 351c that is provided above the side wall portion 351b and is formed in the shape of an annular ring in plan view. The internal space of the main body portion 360 is the space enclosed by the bottom wall portion 351a, the side wall portion 351b, the upper wall portion 351c, and the lid portion 352. For example, wiring (dashed lines in the figure) connected to the slip ring 4, drivers 45A, 45B, 45C and / or actuators 35A, 35B, 35C may be provided in the internal space of the main body portion 360. For example, the main body 360 may surround the drivers 45A, 45B, 45C, etc., with the upper surface of the bottom wall 351a, the inner circumferential surface of the side wall 351b, the lower surface of the upper wall 351c, and the upper surface of the lid 352.

[0071] The main body 360 has a space inside where drivers 45A, 45B, and 45C can be placed. The opening 351h is formed by opening the bottom wall 351a of the main body 360 in the vertical direction. The opening 351h is circular in shape when viewed from above.

[0072] The lid portion 352 is detachably connected to the main body portion 360 via fastening members such as bolts. The lid portion 352 is formed in a rectangular shape with a size greater than or equal to the opening 351h when viewed from above. For example, with the lid portion 352 superimposed on the opening 351h when viewed from above, the lid portion 352 can be connected to the main body portion 360 by inserting bolts through through holes formed in each corner (each corner) of the lid portion 352 and screwing them into nuts provided on the bottom wall portion 351a of the main body portion 360.

[0073] Drivers 45A, 45B, and 45C are installed in a watertight manner on the lower traveling body 3. Drivers 45A, 45B, and 45C are installed in a watertight manner to prevent liquid from flowing into the main body 360 by being positioned inside the main body 360, which is surrounded by the bottom wall portion 351a, the side wall portion 351b, the top wall portion 351c, and the lid portion 352. For example, drivers 45A, 45B, and 45C may be installed in a watertight manner inside the main body 360 by fastening the lid portion 352 to the main body 360 with bolts via a rubber packing (an example of an elastic member).

[0074] In this embodiment, the center frame 330 has a main body portion 360 that supports the slip ring 4 and a connecting portion 361 that connects the main body portion 360 and the side frame 33. The drivers 45A, 45B, and 45C are arranged inside the main body portion 360 or the connecting portion 361. With this configuration, the main body 360 or the connecting part 361 of the center frame 330 can be used as the installation location for the drivers 45A, 45B, and 45C. For example, the unused cavity inside the main body 360 or the connecting part 361 can be used to protect the drivers 45A, 45B, and 45C from external factors.

[0075] In this embodiment, drivers 45A, 45B, and 45C are arranged inside the side frame 33. With this configuration, the side frame 33 can be used as a mounting location for drivers 45A, 45B, and 45C. For example, the unused cavity inside the side frame 33 can be used to protect drivers 45A, 45B, and 45C from external factors.

[0076] In this embodiment, the center frame 330 has an opening 351h for inserting and removing drivers 45A, 45B, and 45C. The center frame 330, in which the opening 351h is formed, is provided with a cover portion 352 that closes the opening 351h. With this configuration, when the opening 351h is closed by the cover 352, the drivers 45A, 45B, and 45C can be protected from external factors. On the other hand, when the cover 352 is removed and the opening 351h is open, the drivers 45A, 45B, and 45C can be inspected.

[0077] In this embodiment, the drivers 45A, 45B, and 45C are installed in a watertight manner on the lower traveling body 3. This configuration enhances the waterproofing of drivers 45A, 45B, and 45C.

[0078] <Fourth Embodiment> Figure 16 is a perspective view of the lower traveling body according to the fourth embodiment, viewed from the upper left, showing the internal structure of the left portion. Figure 17 is a perspective view of the lower traveling body according to the fourth embodiment, viewed from the lower left. Figure 18 is a top view of the lower traveling body according to the fourth embodiment, showing the internal structure of the left portion. Hereinafter, the excavator according to the fourth embodiment will be described with reference to Figures 16 to 18. In the configuration shown in the figures, the same reference numerals are used for components similar to those in the embodiments described above, and their detailed descriptions are omitted.

[0079] The center frame 430 comprises a main body 460 that supports the slip ring 4 and a connecting portion 461 that connects the main body 460 to the side frame 33. Inside the main body 460 or the connecting portion 461, there is space in which drivers 45A, 45B, and 45C can be arranged. For example, a battery cell or capacitor may be housed in the space inside the main body 460 or the connecting portion 461, or at least one of the drivers 45A, 45B, and 45C may be housed. This makes it possible to fill the space inside the main body 460 or the connecting portion 461 without waste.

[0080] The connecting section 461 includes a pair of legs 462L, 462R, 463L, and 463R that branch off from the main body 460 in the front-rear direction of the vehicle when viewed from above. Inside the pair of legs 462L, 462R, 463L, and 463R, there is space for arranging drivers 45A, 45B, and 45C.

[0081] For example, the connecting portion 461 may include a front overhang 464 that extends forward along the outer edges of the front left and right pair of legs 462L, 462R, or it may include a rear overhang 465 that extends backward along the outer edges of the rear left and right pair of legs 463L, 463R. For example, the connecting portion 461 may include a left overhang 466L that extends to the left along the outer edges of the left front and rear pair of legs 462L, 463L, or it may include a right overhang 466R that extends to the right along the outer edges of the right front and rear pair of legs 462R, 463R. The configuration of the connecting portion 461 is not limited to the above and can be changed according to the design specifications.

[0082] For example, if there is ample space between a pair of legs 462L, 462R, 463L, 463R, a battery cell or capacitor may be housed in the space between the pair of legs 462L, 462R, 463L, 463R, or at least one of a plurality of drivers 45A, 45B, 45C may be housed in the space between the pair of legs 462L, 462R, 463L, 463R. This allows for effective use of the space between the pair of legs 462L, 462R, 463L, 463R.

[0083] For example, if there is unused space inside the side frame 33, battery cells or capacitors may be housed in that space, or at least one of the multiple drivers 45A, 45B, and 45C may be housed in it. This makes it possible to fill the space inside the side frame 33 without wasting any space.

[0084] The center frame 430 has an opening 451h for inserting and removing drivers 45A, 45B, and 45C. The center frame 430 with the opening 451h is provided with a cover portion 452 to close the opening 451h.

[0085] The opening 451h is formed in the main body portion 460 of the center frame 430. The lid portion 452 is detachably attached to the main body portion 460. The main body portion 460 is composed of a bottom wall portion 451a formed in an annular shape in plan view, a peripheral wall portion 451b rising upward from the outer peripheral edge of the bottom wall portion 451a, and an upper wall portion 451c extending inward from the upper edge of the peripheral wall portion 451b and formed in an annular shape in plan view. The internal space of the main body portion 460 is the space enclosed by the bottom wall portion 451a, the peripheral wall portion 451b, the upper wall portion 451c, and the lid portion 452. For example, wiring (dashed lines in the figure) connected to the slip ring 4, drivers 45A, 45B, 45C and / or actuators 35A, 35B, 35C may be provided in the internal space of the main body portion 460. For example, the main body 460 may surround the drivers 45A, 45B, 45C, etc., with the upper surface of the bottom wall 451a, the inner surface of the peripheral wall 451b, the lower surface of the upper wall 451c, and the upper surface of the lid 452.

[0086] The main body 460 has a space inside which drivers 45A, 45B, and 45C can be placed. The opening 451h is formed by opening the bottom wall 451a of the main body 460 in the vertical direction. In plan view, the opening 451h is formed in the shape of a circle (in the example shown in the figure, it is an elongated oval or ellipse that is longer in the left-right direction).

[0087] The lid portion 452 is detachably connected to the main body portion 460 via fastening members such as bolts. The lid portion 452 is formed in a circular shape (an elongated oval or elliptical shape in the example shown in the figure) that is larger than or equal to the opening 451h when viewed from above. For example, with the lid portion 452 superimposed on the opening 451h in a view from above, the lid portion 452 can be connected to the main body portion 460 by inserting a bolt through a through hole formed on the outer circumference of the lid portion 452 and screwing it into the female thread of a bracket provided on the bottom wall portion 451a of the main body portion 460.

[0088] Drivers 45A, 45B, and 45C are installed in a watertight manner on the lower traveling body 3. Drivers 45A, 45B, and 45C are installed in a watertight manner to prevent liquid from flowing into the main body 460 by being positioned inside the main body 460, which is surrounded by the bottom wall portion 451a, the peripheral wall portion 451b, the upper wall portion 451c, and the lid portion 452. For example, drivers 45A, 45B, and 45C may be installed in a watertight manner inside the main body 460 by fastening the lid portion 452 to the main body 460 with bolts via a rubber packing (an example of an elastic member).

[0089] In this embodiment, the center frame 430 has a main body portion 460 that supports the slip ring 4 and a connecting portion 461 that connects the main body portion 460 and the side frame 33. The drivers 45A, 45B, and 45C are arranged inside the main body portion 460 or the connecting portion 461. With this configuration, the main body 460 or the connecting part 461 of the center frame 430 can be used as the installation location for the drivers 45A, 45B, and 45C. For example, the unused cavity inside the main body 460 or the connecting part 461 can be used to protect the drivers 45A, 45B, and 45C from external factors.

[0090] In this embodiment, drivers 45A, 45B, and 45C are arranged inside the side frame 33. With this configuration, the side frame 33 can be used as a mounting location for drivers 45A, 45B, and 45C. For example, the unused cavity inside the side frame 33 can be used to protect drivers 45A, 45B, and 45C from external factors.

[0091] In this embodiment, the center frame 430 has an opening 451h for inserting and removing drivers 45A, 45B, and 45C. The center frame 430 having the opening 451h is provided with a cover portion 452 that closes the opening 451h. With this configuration, when the opening 451h is closed by the cover 452, the drivers 45A, 45B, and 45C can be protected from external factors. On the other hand, when the cover 452 is removed and the opening 251h is open, the drivers 45A, 45B, and 45C can be inspected.

[0092] In this embodiment, the drivers 45A, 45B, and 45C are installed in a watertight manner on the lower traveling body 3. This configuration enhances the waterproofing of drivers 45A, 45B, and 45C.

[0093] <Variation> In the above-described embodiment, the upper slewing body has a control unit for controlling the actuator, and the slip ring is described as electrically connecting the control unit and the driver, but the invention is not limited to this. For example, the control unit for controlling the actuator may be provided on the lower traveling body. For example, the upper slewing body does not have to have a control unit for controlling the actuator. The installation configuration of the control unit can be changed according to the design specifications.

[0094] In the embodiments described above, the lower running gear comprises a center frame that supports the slip rings and side frames that are located on both sides in the vehicle width direction relative to the center frame and support the tracks, and the driver is described as being located inside the center frame or side frame, but it is not limited to this. For example, the driver may be located in a different place in the lower running gear from the center frame and side frames. The manner in which the driver is installed in the lower running gear can be changed according to the design specifications.

[0095] In the embodiments described above, the center frame has a main body that supports the slip rings, and the driver is described as being located inside the main body; however, it is not limited to this. For example, the driver may be located outside the main body. The configuration of the driver on the center frame can be changed according to the design specifications.

[0096] In the embodiments described above, the driver was described as being positioned in front of or behind the slip ring in the longitudinal direction of the vehicle, but it is not limited to this. For example, the driver may be positioned to the left or right of the slip ring in the vehicle width direction. The configuration of the driver relative to the slip ring can be changed according to the design specifications.

[0097] In the embodiments described above, the work implement is connected to the front of the main body, and the driver is positioned behind the slip ring. However, the invention is not limited to this configuration. For example, the driver may be positioned to the left or right of the slip ring. The configuration of the driver relative to the connection point of the work implement can be changed according to the design specifications.

[0098] In the embodiments described above, the center frame has a main body that supports the slip ring and a connecting portion that connects the main body and the side frame, and the driver is described as being located inside the connecting portion, but it is not limited to this. For example, the driver may be located inside the main body or the side frame. For example, the driver may be located in a different location on the center frame from the connecting portion. The configuration of the driver on the center frame can be changed according to the design specifications.

[0099] In the embodiments described above, the center frame was explained as being X-shaped in plan view, but it is not limited to this. For example, the center frame may be I-shaped in plan view. The plan view shape of the center frame is not limited to the above and can be changed according to the design specifications.

[0100] In the embodiments described above, the driver was described as being located inside the side frame, but this is not limited to this. For example, the driver may be located in a different location from the side frame in the lower travel body. The installation method of the driver in the lower travel body can be changed according to the design specifications.

[0101] In the embodiments described above, an example was given in which the center frame has an opening for inserting and removing a screwdriver, and the center frame with the opening is provided with a cover to close the opening, but the invention is not limited to this. For example, the side frame may have an opening for inserting and removing a screwdriver, and the side frame with the opening may be provided with a cover to close the opening. For example, the manner in which the opening is formed and / or the manner in which the cover is installed can be changed according to the design specifications.

[0102] In the embodiments described above, the driver was explained as being installed in a watertight manner on the lower traveling body, but this is not limited to this. For example, the driver may be installed outside the lower traveling body. For example, the driver does not have to be installed in a watertight manner on the lower traveling body. The manner in which the driver is installed on the lower traveling body can be changed according to the design specifications.

[0103] As shown in Figure 19, each of the drivers 45A, 45B, and 45C may be placed inside the side frame 33. With this configuration, each of the drivers 45A, 45B, and 45C is enclosed by the side frame 33, thereby protecting each of the drivers 45A, 45B, and 45C from external factors.

[0104] As shown in Figure 20, each of the drivers 45A, 45B, and 45C may be placed inside the connecting part 61 (leg part 62L in the example shown) that connects the main body 60 and the side frame 33. With this configuration, each of the drivers 45A, 45B, and 45C is surrounded by the connecting part 61 (leg part 62L in the example shown), thereby protecting each of the drivers 45A, 45B, and 45C from external factors.

[0105] In the embodiments described above, an example of a fully electric power shovel, in which the main power source and actuators (work implements, travel motors, etc.) are electrically powered, was given, but the invention is not limited to this. For example, the shovel may be equipped with hydraulic motors instead of some electric motors. For example, the shovel may have an electric main power source and the actuators (work implements, travel motors, etc.) may be operated by hydraulics. The configuration of the shovel is not limited to the above and can be changed according to the design specifications.

[0106] Although embodiments of the present invention have been described above, the present invention is not limited thereto, and additions, omissions, substitutions, and other modifications to the configuration are possible without departing from the spirit of the invention, and the above embodiments can be combined as appropriate.

[0107] (Note 1) An upper rotating body having a power source, A lower traveling body having an actuator to which power is supplied from the power source and a driver to drive the actuator, The system includes a slip ring that rotatably connects the upper rotating body and the lower traveling body, and electrically connects the power source and the driver, Shovel. (Note 2) The upper rotating body has a control unit that controls the actuator, The slip ring electrically connects the control unit and the driver. The shovel described in Appendix 1. (Note 3) The lower running body comprises a center frame that supports the slip ring and side frames that are located on both sides in the vehicle width direction relative to the center frame and support the tracks. The driver is located inside the center frame or the side frame. The shovel described in Appendix 2. (Note 4) The center frame has a main body portion that supports the slip ring, The driver is located inside the main body. The shovel described in Appendix 3. (Note 5) The driver is positioned in front of or behind the slip ring in the longitudinal direction of the vehicle. The shovel described in Appendix 4. (Note 6) A work implement is connected to the front of the main body. The driver is positioned behind the slip ring. The shovel described in Appendix 5. (Note 7) The center frame has a main body portion that supports the slip ring and a connecting portion that connects the main body portion and the side frame. The driver is located inside the connection part. A shovel as described in any of the appendices 3 through 6. (Note 8) The aforementioned center frame is X-shaped in plan view. The shovel described in Appendix 7. (Note 9) The driver is located inside the side frame. A shovel as described in any of the appendices 3 through 8. (Note 10) The center frame or the side frame has an opening for inserting and removing the driver. The center frame or side frame in which the opening is formed is provided with a cover portion that closes the opening. A shovel as described in any of the appendices 3 through 9. (Note 11) The driver is installed in a watertight manner on the lower traveling body. A shovel as described in any of the appendices 1 through 10. [Explanation of Symbols]

[0108] 1...Shovel, 2...Upper rotating body, 3...Lower running body, 4...Slip ring, 10...Work implement, 20...Battery (power source), 21...Controller (control unit), 30, 230, 330, 430...Center frame, 31L, 31R...Tracks, 32...Blade (work implement), 33...Side frame, 35A, 35B, 35C...Actuator, 45A...Left running driver (driver), 45B...Right running driver (driver), 45C...Blade driver (driver), 60, 260, 360, 460...Main body, 61, 261, 361, 461...Connection part, 251h, 351h, 451h...Opening, 252, 352, 452...Lid part

Claims

1. An upper rotating body having a power source, A lower traveling body having an actuator to which power is supplied from the power source and a driver to drive the actuator, The system includes a slip ring that rotatably connects the upper rotating body and the lower traveling body, and electrically connects the power source and the driver, Shovel.

2. The upper rotating body has a control unit that controls the actuator, The slip ring electrically connects the control unit and the driver. The shovel according to claim 1.

3. The lower running body comprises a center frame that supports the slip ring and side frames that are located on both sides in the vehicle width direction relative to the center frame and support the tracks. The driver is located inside the center frame or the side frame. The shovel according to claim 2.

4. The center frame has a main body portion that supports the slip ring, The driver is located inside the main body. The shovel according to claim 3.

5. The driver is positioned in front of or behind the slip ring in the longitudinal direction of the vehicle. The shovel according to claim 4.

6. A work implement is connected to the front of the main body. The driver is positioned behind the slip ring. The shovel according to claim 5.

7. The center frame has a main body portion that supports the slip ring and a connecting portion that connects the main body portion and the side frame. The driver is located inside the connection part. The shovel according to claim 3.

8. The aforementioned center frame is X-shaped in plan view. The shovel according to claim 7.

9. The driver is located inside the side frame. The shovel according to claim 3.

10. The center frame or the side frame has an opening for inserting and removing the driver. The center frame or side frame in which the opening is formed is provided with a cover portion that closes the opening. The shovel according to claim 3.

11. The driver is installed in a watertight manner on the lower traveling body. A shovel according to any one of claims 1 to 10.

Images