Work machine

Abstract

To provide a technique with which a hydraulic cylinder can be appropriately laid out in a work machine that has a swing mechanism with use of a hydraulic cylinder.SOLUTION: An exemplary work machine, being a work machine comprising a revolving superstructure in front of which a work device is arranged, comprises: a revolving frame constituting a bottom part of the revolving superstructure; a first longitudinal plate and a second longitudinal plate extending from forward to rearward on the revolving frame, and laterally arranged at an interval; a swinging body supported by the revolving frame so as to enable horizontal rotation in front of the first longitudinal plate and the second longitudinal plate to support the work device; a hydraulic cylinder arranged on the revolving frame in the outer side of the machine body, opposite to the second longitudinal plate with respect to the first longitudinal plate; and an auxiliary longitudinal plate arranged on the revolving frame between the first longitudinal plate and the hydraulic cylinder, and connected to the other end part of the hydraulic cylinder.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a work machine. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there has been known a slewing work vehicle equipped with a so-called swing function, in which a support part that supports a work machine so that the work machine can be turned up and down turns horizontally (see, for example, Patent Document 1).

[0003] The swivel work vehicle disclosed in Patent Document 1 includes a lower travelling body and an upper swivel body rotatably provided above the lower travelling body. A horizontally rotatable swing body is provided at the front of a swivel frame that constitutes the bottom of the upper swivel body. The swing body supports a work machine so that it can rotate up and down. A first vertical plate and a second vertical plate are arranged on the bottom plate of the swivel frame, spaced apart from each other on the left and right, and erected to extend in the front-rear direction. A hydraulic swing cylinder is provided on the opposite side of the first vertical plate across the second vertical plate, and connects the swivel frame and the swing body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-218784 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, a hydraulic pump that pumps oil to a hydraulic actuator such as a swing cylinder may be driven by an electric motor. In such a configuration, a battery unit that supplies power to the electric motor is mounted on the rotating frame. If the battery unit is to have a large storage capacity, the battery unit will occupy a large area on the rotating frame.

[0006] Because the battery unit is heavy, it is considered advantageous to place it near the center of the revolving frame, whose strength has been improved by the placement of the first and second vertical plates. In such a configuration, components such as the electric motor and hydraulic pump are placed to the side of the battery unit, and there is a possibility that interference between at least some of these components and the swing cylinder will become a problem.

[0007] In view of the above, an object of the present invention is to provide a technique for appropriately laying out a hydraulic cylinder in a work machine equipped with a swing function that utilizes a hydraulic cylinder. [Means for solving the problem]

[0008] An exemplary work machine of the present invention is a work machine equipped with a rotating body with a working device arranged in front of it, and comprises a rotating frame that forms the bottom of the rotating body, a first vertical plate and a second vertical plate that extend from front to rear on the rotating frame and are arranged at a distance from each other on the left and right, a swinging body that is supported on the rotating frame in front of the first vertical plate and the second vertical plate and is horizontally rotatable and supports the working device, a hydraulic cylinder that is arranged on the rotating frame outside the machine body on the opposite side of the second vertical plate from the first vertical plate and has one end connected to the swinging body, and an auxiliary vertical plate that is arranged on the rotating frame between the first vertical plate and the hydraulic cylinder and is connected to the other end of the hydraulic cylinder. Effect of the Invention

[0009] According to the exemplary embodiment of the present invention, in a work machine having a swing function utilizing a hydraulic cylinder, the hydraulic cylinder can be appropriately laid out. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view showing a schematic configuration of a work machine; [Diagram 2] FIG. 1 is a perspective view showing a schematic internal configuration of a rotating body; [Diagram 3] 3 is a schematic plan view of the configuration shown in FIG. 2. [Figure 4] FIG. 11 is a side view showing a schematic relationship between the auxiliary vertical plate, the swing cylinder, and the first vertical plate. [Diagram 5] FIG. 1 is a perspective view showing a schematic relationship between a swing cylinder and a hydraulic oil tank on a rotating frame. [Figure 6] FIG. 1 is a perspective view showing a schematic relationship between a swing cylinder and a hydraulic oil tank on a rotating frame. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters, and unless otherwise necessary, the description will not be repeated.

[0012] <1. Overview of the work machine> FIG. 1 is a perspective view showing a schematic configuration of a work machine 100 according to an embodiment of the present invention. Specifically, the work machine 100 is a hydraulic excavator. The work machine 100 may be, for example, a small hydraulic excavator. Note that the work machine of the present invention is not limited to a hydraulic excavator. The present invention is widely applicable to work machines equipped with a rotating body (swivel work machine).

[0013] As shown in FIG. 1, the work machine 100 includes a revolving body 1, a traveling body 2, and a work implement 3.

[0014] In this specification, the side of the rotating body 1 where the working device 3 is located is defined as "front", and the front-rear direction is defined as the up-down direction. The direction of gravity perpendicular to the front-rear direction is defined as the up-down direction, and the upstream side of the gravity direction is defined as "up", and the downstream side is defined as "down". The direction perpendicular to the front-rear direction and the up-down direction is defined as the left-right direction, and the left side from the rear to the front is defined as the "left", and the right side is defined as the "right". A plane parallel to the front-rear direction and the left-right direction is defined as a horizontal plane, and a plane perpendicular to the horizontal plane is defined as a vertical plane. Note that the rotating body 1 does not have a constant orientation because it rotates, but the directional expressions are used on the assumption that the rotating body 1 is constant in the orientation shown in FIG. 1. The directions defined here are simply names used for explanation, and are not intended to limit the actual positional relationship and direction.

[0015] The rotating body 1 is provided so as to be rotatable around an axis extending vertically at its center. In this embodiment, the rotating body 1 is rotatably supported by a traveling body 2 provided below it. The rotating body 1 is driven to rotate by a rotation motor (not shown) configured as a hydraulic motor. The rotating body 1 is provided so as to be able to rotate right and left. A working device 3 is provided in front of the rotating body 1. That is, the work machine 100 is provided with a rotating body 1 with a working device 3 provided in front of it.

[0016] The rotating body 1 is provided with a driver's seat 11 in which an operator who operates the work machine 100 sits. The operator sitting in the driver's seat 11 faces forward and operates various operating devices provided around the driver's seat 11. In this embodiment, the operating devices include an operating lever 12. The driver's seat 11 is supported by a cover (not shown) that covers various members arranged inside the rotating body 1 (engine room). The various members arranged inside the rotating body 1 will be described later. In addition, a counterweight 13 is arranged at the rear end of the rotating body 1.

[0017] The traveling body 2 enables the work machine 100 to self-propel. In detail, the traveling body 2 has a pair of crawlers 22 arranged on the left and right of the traveling body frame 21. Each crawler 22 is driven by a traveling motor 23 consisting of a hydraulic motor. When the pair of left and right crawlers 22 are driven simultaneously in the same direction, the traveling body 2 moves straight forward or backward. Whether it moves forward or backward is determined by the rotation direction of the traveling motor 23. The traveling body 2 turns left or right as the pair of left and right crawlers 22 are driven independently.

[0018] Although the traveling body 2 in this embodiment is a crawler type, the traveling body is not limited to the crawler type and may be a wheel type, etc. In addition, a blade for performing ground leveling work may be provided at the front or rear of the traveling body 2.

[0019] The working device 3 has a boom 31, an arm 32, and a bucket 33. The working device 3 performs excavation work of earth and sand by moving these simultaneously or independently. Note that the bucket 33 may be changed to another working tool such as a breaker used in demolition work, for example.

[0020] One end of the boom 31 is supported by a boom bracket 34 and is rotatable within a vertical plane (rotatable up and down). The boom bracket 34 is supported by the rotating body 1. The boom 31 is bent at the middle portion and is V-shaped in side view. The boom 31 rotates by the extension and contraction of a boom cylinder 35, the other end of which is connected to the boom bracket 34 and the middle portion of the boom 31.

[0021] One end of the arm 32 is supported on the other end of the boom 31 so as to be rotatable within a vertical plane. One end of the arm 32 is connected to the middle part of the boom 31, and the other end of the arm 32 is rotated by extension and contraction of an arm cylinder 36 connected to one end of the arm 32. One end of the bucket 33 is supported on the other end of the arm 32 so as to be rotatable within a vertical plane. One end of the bucket 33 is connected to one end of the arm 32, and the other end of the bucket 33 is rotated by extension and contraction of a bucket cylinder 37 connected to the bucket 33. Note that in FIG. 1, the boom 31, the arm 32, and the bucket 33 are each provided so as to be rotatable about an axis (not shown) extending in the left-right direction.

[0022] More specifically, the boom bracket 34 is supported by the revolving unit 1 so as to be rotatable within a horizontal plane (horizontally rotatable). In other words, the boom bracket 34 is rotatable about an axis (not shown) extending in the vertical direction. The boom bracket 34 rotates counterclockwise or clockwise due to expansion and contraction of a swing cylinder 38, one end of which is connected to the boom bracket and the other end of which is connected to the revolving unit 1. In other words, the working device 3 can be swung counterclockwise or clockwise by operating the swing cylinder 38.

[0023] The boom cylinder 35, arm cylinder 36, bucket cylinder 37, and swing cylinder 38 are all hydraulic cylinders, and are included in the hydraulic actuators of the work machine 100. The hydraulic actuators of the work machine 100 also include the above-mentioned travel motor 23 and swing motor (not shown). An operator sitting in the driver's seat 11 can control the hydraulic actuators by operating the above-mentioned operation lever 12, and perform work using the work implement 3.

[0024] <2. Configuration of rotating body> [2-1. Overview of the inside of the rotating body] Fig. 2 is a perspective view showing a schematic configuration of the inside of the revolving structure 1. As shown in Fig. 2, the revolving structure 1 is provided with a revolving frame 14 at its bottom. In other words, the work machine 100 is provided with the revolving frame 14 that constitutes the bottom of the revolving structure 1. The revolving frame 14 is made up of a flat plate-shaped member. Various members are mounted on the revolving frame 14.

[0025] 2, a battery unit 4, an electric motor 5, a hydraulic pump 6, and a control valve 7 are disposed on the revolving frame 14. That is, the work machine 100 is equipped with the battery unit 4, the electric motor 5, the hydraulic pump 6, and the control valve 7. The work machine 100 is equipped with the battery unit 4, the electric motor 5, the hydraulic pump 6, and the control valve 7, which are disposed on the revolving frame 14.

[0026] In addition, the other end of the swing cylinder 38 described above is connected to the swivel frame 14, and the swing cylinder 38 is disposed therein, which will be described later.

[0027] (2-1-1. Swivel frame) Figure 3 is a schematic plan view seen from above of the configuration shown in Figure 2. As shown in Figures 2 and 3, the revolving frame 14 is equipped with a first vertical plate 142 and a second vertical plate 143. That is, the work machine 100 is equipped with the first vertical plate 142 and the second vertical plate 143. By providing the first vertical plate 142 and the second vertical plate 143, the strength of the revolving frame 14 can be increased.

[0028] The first vertical plate 142 and the second vertical plate 143 are provided in a plate shape and are erected in the left-right central portion of the upper surface of the revolving frame 14. The first vertical plate 142 and the second vertical plate 143 extend from the front to the rear on the revolving frame 14 and are arranged with a gap in the left-right direction. In detail, the first vertical plate 142 is arranged on the right side and the second vertical plate 143 is arranged on the left side. However, this is an example, and the first vertical plate 142 may be on the left side and the second vertical plate 143 may be on the right side. The first vertical plate 142 and the second vertical plate 143 have an inclined structure in which the vertical height of the rear side is lower than that of the front side. The first vertical plate 142 and the second vertical plate 143 are the same member integrated with the revolving frame 14.

[0029] A bracket support part 144 that supports the boom bracket 34 so as to be horizontally rotatable is provided at the left-right center of the front end part of the revolving frame 14. The front ends of the first vertical plate 142 and the second vertical plate 143 are fixed to the bracket support part 144. The boom bracket 34 that rotatably supports the boom 31 of the working implement 3 is an example of a swinging body of the present invention. In other words, the working machine 100 is provided with the swinging body 34 that is supported by the revolving frame 14 in front of the first vertical plate 142 and the second vertical plate 143 so as to be horizontally rotatable and supports the working implement 3.

[0030] (2-1-2. Battery unit) The battery unit 4 includes at least one battery 41. The battery 41 is, for example, a secondary battery such as a lithium ion battery. In this embodiment, as shown in FIG. 2, the battery unit 4 includes a plurality of batteries 41. The plurality of batteries 41 may be connected in series or in parallel. For example, the plurality of batteries 41 may be configured such that some of them are connected in series and some of the batteries connected in series are connected in parallel. In this embodiment, the number of batteries 41 is four. The four batteries 41 are connected in series two by two, and two batteries 41 connected in series are connected in parallel.

[0031] The work machine 100 is equipped with a power supply (not shown) that converts power supplied from an AC power source (such as a commercial power source) external to the work machine 100 from AC power to DC power. The battery unit 4 can be charged by being supplied with power from the power supply. The battery unit 4 can also supply power to various loads equipped in the work machine 100, such as the electric motor 5.

[0032] As shown in Figs. 2 and 3, a battery unit support base 145 is provided on the upper surface of the revolving frame 14 (see also Fig. 6, etc.). The battery unit support base 145 is a single member integrated with the revolving frame 14. In this embodiment, the battery unit support base 145 is divided into multiple parts, but it may be composed of a single part. The battery unit 4 is supported on the battery unit support base 145 via a vibration-proof member 146. The vibration-proof member 146 is composed of, for example, a rubber member.

[0033] The battery unit 4 supported by the battery unit support stand 145 is disposed approximately in the center in the left-right direction of the revolving frame 14, and more specifically, is disposed slightly shifted to the left from the center. Also, the battery unit 4 supported by the battery unit support stand 145 is disposed slightly rearward from the center in the front-rear direction of the revolving frame 14. Also, as shown in FIG. 3, the battery unit 4 overlaps with the second vertical plate 143 in a plan view. The battery unit 4 is above the second vertical plate 143. As can be seen from the above, the battery unit 4 is disposed near the center of the revolving frame 14 where the first vertical plate 142 and the second vertical plate 143 are disposed, increasing the strength.

[0034] (2-1-3. Electric motor) The electric motor 5 uses the power of the battery unit 4 as a power source. That is, the electric motor 5 is driven by the power supplied from the battery unit 4. In this embodiment, the electric motor 5 is a three-phase AC motor whose rotation speed is determined by a rotating magnetic field. In detail, power is supplied from the battery unit 4 to an inverter device (not shown). The inverter device converts the DC power supplied from the battery unit 4 into AC power and supplies the AC power to the electric motor 5.

[0035] As shown in FIG. 2 and FIG. 3, a motor support base 147 is provided on the upper surface of the revolving frame 14. In this embodiment, the motor support base 147 is divided into a plurality of parts, but may be configured as a single part. The electric motor 5 is supported by the motor support base 147. The motor support base 147 is supported by the revolving frame 14 via a vibration isolating member 146. The electric motor 5 supported by the motor support base 147 is disposed adjacent to one side (the right side in this embodiment) in the left-right direction of the battery unit 4. As shown in FIG. 3, the electric motor 5 overlaps with the first vertical plate 142 in a plan view. The electric motor 5 is on the upper side of the first vertical plate 142. As can be seen from the above, the heavy electric motor 5 is disposed in a position relatively close to the left-right central portion of the revolving frame 14 where the first vertical plate 142 and the second vertical plate 143 are disposed and strength is increased.

[0036] (2-1-4. Hydraulic pump) The hydraulic pump 6 is driven by the electric motor 5. The hydraulic pump 6 driven by the electric motor 5 pressure-feeds hydraulic oil to the above-mentioned hydraulic actuators (hydraulic cylinders 35 to 38, hydraulic motor 23, etc.).

[0037] Specifically, the hydraulic pump 6 is disposed adjacent to the right of the electric motor 5. The hydraulic pump 6 is connected to a connector 5a provided at the right end of the electric motor 5. Specifically, the motor support base 147 supports the connector 5a. The hydraulic pump 6 is disposed outside the machine body on the opposite side to the second vertical plate 143 side (the right side in this embodiment) with respect to the first vertical plate 142. By arranging members that are lighter than heavy objects such as the battery unit 4 outside the machine body, the balance of the work machine 100 can be improved.

[0038] (2-1-5. Control valve) The control valve 7 is interposed between the hydraulic pump 6 and the hydraulic actuator (hydraulic cylinders 35-38 and hydraulic motor 23, etc.). The control valve 7 is a control valve that is operated by an operating lever 12 and controls the flow of hydraulic oil supplied from the hydraulic pump 6 to the hydraulic actuator. More specifically, the control valve 7 controls the flow direction and flow rate of the hydraulic oil.

[0039] More specifically, the control valve 7 is an assembly of a plurality of hydraulic switching valves. The control valve 7 controls the operation of the hydraulic cylinders 35-38 and the hydraulic motor 23, etc., included in the hydraulic actuator, by switching between supplying and discharging hydraulic oil to each of them. The control valve 7 is disposed outside the machine body, on the opposite side to the first vertical plate 142 side (on the left side in this embodiment) with respect to the second vertical plate 143. By disposing members that are lighter than heavy objects such as the battery unit 4 outside the machine body, the balance of the work machine 100 can be improved.

[0040] [2-2. Swing cylinder layout] Next, the layout of the swing cylinder 38, which is one of the hydraulic cylinders included in the work machine 100, will be described.

[0041] 3, the swing cylinder 38 is disposed on the revolving frame 14 on the outside of the machine body, on the opposite side of the second vertical plate 143 side with respect to the first vertical plate 142 (on the right side in this embodiment). As described above, one end (front end) of the swing cylinder 38 is connected to the boom bracket (swinging body) 34. That is, the work machine 100 is provided with a hydraulic cylinder 38 that is disposed on the revolving frame 14 on the outside of the machine body, on the opposite side of the second vertical plate 143 side with respect to the first vertical plate 142, and one end of which is connected to the swinging body 34. One end of the swing cylinder 38 is connected to the boom bracket 34 so as to be horizontally rotatable.

[0042] 3, the work machine 100 is provided with an auxiliary vertical plate 148 disposed between the first vertical plate 142 and the swing cylinder (hydraulic cylinder) 38 on the rotating frame 14. In detail, the auxiliary vertical plate 148 is disposed to the right of the first vertical plate 142 and to the left of the swing cylinder 38. The auxiliary vertical plate 148 is disposed outboard of the machine body with respect to the first vertical plate 142, and disposed inboard of the machine body with respect to the swing cylinder 38.

[0043] The auxiliary vertical plate 148 is provided in a plate shape and stands on the upper surface of the revolving frame 14. The auxiliary vertical plate 148 is the same member integrated with the revolving frame 14. The auxiliary vertical plate 148 extends from the front to the rear on the revolving frame 14. The auxiliary vertical plate 148 is disposed at an angle with respect to the first vertical plate 142 that also extends from the front to the rear. As the auxiliary vertical plate 148 moves from the front to the rear, it moves away from the first vertical plate 142 toward the outside of the aircraft (to the right in this embodiment). The front side of the auxiliary vertical plate 148 bends toward the inside of the aircraft (to the left) and faces the first vertical plate 142. In detail, the front end of the auxiliary vertical plate 148 is connected to the first vertical plate 142. This can increase the strength of the auxiliary vertical plate 148.

[0044] The auxiliary vertical plate 148 is connected to the other end (rear end) of the swing cylinder (hydraulic cylinder) 38. In other words, the other end of the swing cylinder 38 is supported by the auxiliary vertical plate 148. The other end of the swing cylinder 38 is connected to the auxiliary vertical plate 148 so as to be horizontally rotatable. With this configuration, the swing cylinder 38 can be supported further outboard of the machine body by the auxiliary vertical plate 148 which is disposed further outboard of the machine body than the first vertical plate 142. This makes it easier to arrange the swing cylinder 38 on the revolving frame 14 while avoiding interference with other equipment.

[0045] In particular, in this embodiment, the electric motor 5 is disposed at a position overlapping with the first vertical plate 142 in a plan view, but according to the configuration of this embodiment, the swing cylinder 38 can be disposed so as to avoid interference with the electric motor 5.

[0046] In this embodiment, as shown in Fig. 3, the hydraulic pump 6 overlaps with the auxiliary vertical plate 148 in a plan view. The hydraulic pump 6 is on the upper side of the auxiliary vertical plate 148. The hydraulic pump 6 is smaller in size than the electric motor 5, and is not directly supported by the revolving frame 14. By disposing the auxiliary vertical plate 148 supporting the swing cylinder 38 below such equipment, the battery unit 4 and the electric motor 5, which are heavy and require firm support, can be supported over a wide area on the central side of the revolving frame 14, which has high strength. As a result, it is possible to install a battery unit 4 with a large storage capacity.

[0047] Fig. 4 is a side view showing a schematic relationship between the auxiliary vertical plate 148, the swing cylinder 38, and the first vertical plate 142. Fig. 4 is a view of the revolving frame 14 as seen from the right. As shown in Fig. 4, the auxiliary vertical plate 148 includes a connecting portion 148a having a connecting structure 1481 that connects the other end (rear end) of the swing cylinder (hydraulic cylinder) 38. The auxiliary vertical plate 148 includes the connecting portion 148a at its rear end.

[0048] Specifically, the connecting structure 1481 has an upper plate-like body 1481a and a lower plate-like body 1481b disposed below the upper plate-like body 1481a. The upper plate-like body 1481a and the lower plate-like body 1481b protrude from the connecting portion 148a (auxiliary vertical plate 148) toward the outside of the machine body. Specifically, the upper plate-like body 1481a and the lower plate-like body 1481b protrude rightward from the right side surface of the connecting portion 148a and extend in the horizontal direction. The upper plate-like body 1481a and the lower plate-like body 1481b are disposed with a gap therebetween in the vertical direction. The rear end portion 38a of the swing cylinder 38 is disposed between the upper plate-like body 1481a and the lower plate-like body 1481b in the vertical direction. The rear end 38a of the swing cylinder 38 is connected to an upper plate-like body 1481a and a lower plate-like body 1481b via a pin member 149 that passes through them in the vertical direction so as to be horizontally rotatable.

[0049] As shown in FIG. 4, in a side view in the left-right direction, the connecting portion 148a protrudes upward relative to the first vertical plate 142. The connecting portion 148a that connects the other end (rear end) of the swing cylinder 38 is easily increased in height in the up-down direction because the connecting structure 1481 is provided. For this reason, if a connecting portion having a connecting structure is provided on the first vertical plate 142 present inside the machine body, interference with the electric motor 5 and the like becomes a problem. In this regard, in this embodiment, the connecting portion 148a is provided on the auxiliary vertical plate 148 that is disposed outside the machine body relative to the first vertical plate 142. For this reason, the swing cylinder 38 can be disposed on the revolving frame 14 while avoiding interference with large-sized equipment such as the electric motor 5 disposed inside the machine body.

[0050] 3, the swing cylinder (hydraulic cylinder) 38 is disposed in front of the hydraulic pump 6. This allows the swing cylinder 38 to be disposed so as to avoid the electric motor 5 and battery unit 4 that are disposed further inward (leftward in this embodiment) than the hydraulic pump 6.

[0051] Figures 5 and 6 are perspective views showing the schematic relationship between the swing cylinder 38 and the hydraulic oil tank 9 on the revolving frame 14. Figure 5 is a view seen diagonally from the front left. Figure 6 is a view seen diagonally from the rear left. As can be seen with reference to Figures 3, 5, and 6, the hydraulic oil tank 9 is disposed in front of the hydraulic pump 6. The hydraulic oil tank 9 is a tank that stores the hydraulic oil discharged by the hydraulic pump 6. In other words, the work machine 100 is provided with the hydraulic oil tank 9 in front of the hydraulic pump 6, which stores the hydraulic oil discharged by the hydraulic pump 6.

[0052] The hydraulic oil in the hydraulic oil tank 9 is sent to the control valve 7 by driving the hydraulic pump 6. The hydraulic oil sent to the control valve 7 is sent to the hydraulic actuators (hydraulic cylinders 35-38 and hydraulic motor 23, etc.) under the control of the control valve 7. Of the hydraulic oil sent to the control valve 7, a portion of the hydraulic oil that is not sent to the hydraulic actuators is returned to the hydraulic oil tank 9. In addition, the hydraulic oil sent to the hydraulic actuators is returned to the hydraulic oil tank 9 from the hydraulic actuators via an oil cooler (not shown).

[0053] 5 and 6, the swing cylinder (hydraulic cylinder) 38 passes through a notch 91 provided in the hydraulic tank 9. This configuration allows efficient use of the space on the revolving frame 14. More specifically, the notch 91 is provided in the lower part of the hydraulic tank 9. The notch 91 is configured by positioning the left side wall to the right and the bottom wall upward in a portion of the lower side of the hydraulic tank 9.

[0054] The swing cylinder (hydraulic cylinder) 38 is disposed between the auxiliary vertical plate 148 and a side wall 9a of the hydraulic oil tank 9 at a portion where the notch 91 is provided. The side wall 9a corresponds to the left side wall at the bottom of the hydraulic oil tank 9 and is located outside the aircraft (to the right) with respect to the auxiliary vertical plate 148. The swing cylinder 38 is disposed between the right surface of the auxiliary vertical plate 148 and the side wall 9a in the left-right direction.

[0055] The auxiliary vertical plate 148 supports the bottom wall 9b of the hydraulic oil tank 9 at a portion where the notch portion 91 is provided. More specifically, the auxiliary vertical plate 148 supports the left end portion of the bottom wall 9b. With this configuration, the auxiliary vertical plate 148 can be given not only the function of supporting the swing cylinder 38 but also the function of supporting the hydraulic oil tank 9. That is, with this configuration, the number of elements (support members) to be arranged on the revolving frame 14 can be reduced, and devices can be arranged on the revolving frame 14 efficiently.

[0056] <3. Things to keep in mind> Various technical features disclosed in this specification may be modified in various ways without departing from the spirit of the technical creation. Furthermore, multiple embodiments and modifications shown in this specification may be combined to the extent possible.

[0057] <4. Notes> An exemplary working machine of the present invention may be a working machine equipped with a rotating body with a working device arranged in front of it, and may be configured (first configuration) to include a rotating frame that forms the bottom of the rotating body, a first vertical plate and a second vertical plate that extend from front to rear on the rotating frame and are arranged at a distance from each other on the left and right, a swinging body that is supported on the rotating frame in front of the first vertical plate and the second vertical plate and is horizontally rotatable and supports the working device, a hydraulic cylinder that is arranged on the rotating frame outside the machine body on the opposite side of the second vertical plate from the first vertical plate and has one end connected to the swinging body, and an auxiliary vertical plate that is arranged on the rotating frame between the first vertical plate and the hydraulic cylinder and is connected to the other end of the hydraulic cylinder.

[0058] In the work machine of the above-mentioned first configuration, the auxiliary vertical plate is provided with a connecting portion having a connecting structure that connects the other end of the hydraulic cylinder, and when viewed from the left-right side, the connecting portion may be configured to protrude upward relative to the first vertical plate (second configuration).

[0059] In the work machine of the above first or second configuration, the front end of the auxiliary vertical plate may be configured to be connected to the first vertical plate (third configuration).

[0060] A work machine of any of the above first to third configurations may be configured (fourth configuration) to include a battery unit overlapping with the second vertical plate in a planar view, an electric motor that is powered by electricity from the battery unit and overlaps with the first vertical plate in a planar view, and a hydraulic pump that is driven by the electric motor and overlaps with the auxiliary vertical plate in a planar view.

[0061] The work machine of the fourth configuration described above may have a configuration (fifth configuration) in which the hydraulic cylinder is disposed in front of the hydraulic pump.

[0062] The work machine of the above-mentioned fifth configuration may be configured (sixth configuration) to include a hydraulic oil tank forward of the hydraulic pump for storing hydraulic oil discharged by the hydraulic pump, and the hydraulic cylinder passes through a cutout portion provided in the hydraulic oil tank.

[0063] In the work machine of the sixth configuration described above, the hydraulic cylinder may be configured (seventh configuration) to be disposed between the auxiliary vertical plate and a side wall of a portion of the hydraulic oil tank where the cutout portion is provided.

[0064] In the work machine of the seventh configuration described above, the auxiliary vertical plate may be configured to support a bottom wall of a portion of the hydraulic oil tank where the cutout portion is provided (eighth configuration). [Explanation of symbols]

[0065] 1. Rotating body 3. Working device 4. Battery unit 5. Electric motor 6. Hydraulic pump 9. Hydraulic oil tank 14 Swivel frame 34 Boom bracket (swing body) 38···Swing cylinder (hydraulic cylinder) 91 Notch 100...Work machinery 142...First vertical plate 148...Auxiliary vertical plate 148a...Connection part 1481...Connection structure

Claims

1. A work machine having a rotating body with a work implement disposed in front thereof, A revolving frame that constitutes a bottom portion of the revolving body; a first vertical plate and a second vertical plate extending from the front to the rear on the rotating frame and arranged with a gap between them on the left and right; a swinging body supported by the rotating frame in front of the first vertical plate and the second vertical plate so as to be horizontally rotatable and supporting the working device; a hydraulic cylinder disposed on the rotating frame on the outer side of the aircraft body opposite the second vertical plate with respect to the first vertical plate, the hydraulic cylinder having one end connected to the swinging body; an auxiliary vertical plate disposed on the rotating frame between the first vertical plate and the hydraulic cylinder and connected to the other end of the hydraulic cylinder; A work machine comprising:

2. the auxiliary vertical plate includes a connecting portion having a connecting structure that connects the other end of the hydraulic cylinder, The work machine according to claim 1 , wherein the connecting portion protrudes upward relative to the first vertical plate in a side view in the left-right direction.

3. The work machine according to claim 1 or 2, wherein a front end portion of the auxiliary vertical plate is connected to the first vertical plate.

4. A battery unit overlapping the second vertical plate in a plan view; an electric motor that uses the power of the battery unit as a power source and overlaps with the first vertical plate in a plan view; a hydraulic pump driven by the electric motor and overlapping with the auxiliary vertical plate in a plan view; 2. The work machine of claim 1 , comprising:

5. The work machine according to claim 4 , wherein the hydraulic cylinder is disposed forward of the hydraulic pump.

6. a hydraulic oil tank for storing hydraulic oil discharged by the hydraulic pump is provided in front of the hydraulic pump; The work machine according to claim 5 , wherein the hydraulic cylinder passes through a notch provided in the hydraulic oil tank.

7. The work machine according to claim 6 , wherein the hydraulic cylinder is disposed between the auxiliary vertical plate and a side wall of a portion of the hydraulic oil tank where the cutout portion is provided.

8. The work machine according to claim 7 , wherein the auxiliary vertical plate supports a bottom wall of the hydraulic oil tank at a portion where the cutout portion is provided.

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