Work machinery and buckets

Abstract

To provide a work machine that can more effectively suppress the accumulation of workpieces in the bucket with a simple configuration. [Solution] The wheel loader (working machine) comprises a front body and a rear body, and a working device that is pivotably attached to the front body and has a bucket 3 at its tip. The wheel loader is positioned so as to form a part of the working surface 3a of the bucket 3 through a through hole 38 formed by cutting out the bucket 3, and is equipped with an oil box 40 that circulates and supplies oil used in the front body and rear body, and a hydraulic pump that circulates the oil. As a result, the working surface 3a of the bucket 3 is heated in each oil box 40, drying the work object on the working surface 3a and reducing its stickiness. As a result, the residue of work objects on the working surface 3a is suppressed, and any remaining work objects can be easily peeled off the working surface 3a.

Description

Technical Field

[0001] The present invention relates to a work machine including a bucket and a work device provided with the bucket.

Background Art

[0002] Conventionally, a technique related to a work machine including a work device that is swingably attached to a vehicle body and provided with a bucket at its tip is known. For example, Patent Document 1 describes a hydraulic excavator in which a heating plate with an electric resistance band embedded therein is attached to a bucket body. In this hydraulic excavator, the bucket body is heated by the heating plate to make it easier to peel off the clayey soil deposited in the bucket.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the configuration described in Patent Document 1 above, since the heating plate consumes relatively a lot of power, it is necessary to additionally mount a battery for supplying power to the heating plate on the vehicle body, which may cause space constraints.

[0005] The present invention has been made in view of such problems, and an object thereof is to provide a work machine and its bucket that can more favorably suppress the deposition of work objects in the bucket with a simple configuration.

Means for Solving the Problems

[0006] To achieve the above objective, the present invention provides a work machine comprising a vehicle body and a work device that is pivotably attached to the vehicle body and has a bucket at its tip, wherein the work machine comprises an oil box that is arranged to form a part of the working surface of the bucket through a through hole formed by cutting out the bucket, and to which oil used in at least one of the vehicle body and the work device is circulated and supplied, and a pump for circulating the oil.

[0007] To achieve the above objective, the bucket of the present invention is a bucket attached to a work device of a work machine, and is characterized in that it is positioned to form a part of the work surface of the bucket through a through hole formed by cutting out the bucket, and is equipped with an oil box through which oil used in the work machine is circulated and supplied. [Effects of the Invention]

[0008] The work machine and bucket of the present invention make it possible to more effectively suppress the accumulation of work objects in the bucket with a simple configuration. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic diagram showing a wheel loader as a work machine according to an embodiment. [Figure 2] This is a perspective view of the bucket from the opening side. [Figure 3] This is a front view of the bucket, looking at the opening side. [Figure 4] This is a perspective view looking at the bucket from the opposite side of the opening. [Figure 5] This is a side view of the bucket. [Figure 6] This is an explanatory diagram showing an example of an oil circulation system. [Figure 7] This is a perspective view showing the oil box. [Figure 8] This is a perspective view of the oil box from the opposite side of Figure 7. [Figure 9]This is a perspective view showing the inside of the oil box. [Figure 10] This is an enlarged perspective view showing the upper part of the inside of the oil box. [Figure 11] This is an explanatory diagram showing the oil circulation system in a modified example. [Modes for carrying out the invention]

[0010] An embodiment of the present invention will be described below with reference to the drawings.

[0011] (Wheel loader: work machine) Figure 1 is a schematic diagram showing a wheel loader as a work machine according to an embodiment. The wheel loader 1 shown in Figure 1 is a work machine that performs cargo handling operations, such as excavating work materials like soil and minerals at a work site and transporting the excavated work materials to other loading destinations such as dump trucks or hoppers.

[0012] The wheel loader 1 has a front body (body) 1a equipped with front wheels 8, and a rear body (body) 1b connected to the front body 1a and equipped with rear wheels 9. The front body 1a is equipped with a working device 2. The working device 2 has a bucket 3, a bell crank 4, a bucket cylinder 5, an arm 6, and an arm cylinder 7 according to this embodiment. The arm 6 is mounted to the front body 1a so as to be able to swing up and down, and is rotationally driven by the extension and retraction of a hydraulic arm cylinder 7. The bucket 3 is mounted to the tip of the arm 6 so as to be able to swing up and down, and is rotationally driven via the bell crank 4 by the extension and retraction of a hydraulic bucket cylinder 5.

[0013] The rear body 1b is provided with a driver's cab 14, an engine room 10, and an engine 11. The engine 11 is, for example, a diesel engine, which is arranged in the engine room 10 and outputs driving force for traveling to the front wheel tires 8 and the rear wheel tires 9. The driving force for traveling from the engine 11 is output to the front wheel tires 8 via a transaxle 12 as a power transmission mechanism, and is also output to the rear wheel tires 9 via a transaxle 13 as a power transmission mechanism. The transaxles 12 and 13 are supplied with oil for lubrication and cooling. Further, the rear body 1b is equipped with a main pump 15 that supplies hydraulic oil to various hydraulic devices such as an arm cylinder 7 and a bucket cylinder 5. The main pump 15 sucks and discharges hydraulic oil from a hydraulic oil tank 18 mounted on the rear body 1b. The hydraulic oil discharged from the main pump 15 is supplied to various hydraulic devices from a multi-control valve 16 mounted on the front body 1a.

[0014] Furthermore, the rear body 1b is equipped with a controller 17 as a control device for controlling the entire wheel loader 1. The controller 17 is composed of, for example, a central processing unit (CPU), a ROM (Read Only Memory), a RAM (Random Access Memory), a non-volatile RAM, and the like. The controller 17 controls, for example, the engine 11, the main pump 15, the multi-control valve 16, etc. to control the traveling of the wheel loader 1 and the driving of the working device 2.

[0015] (Bucket) Next, the bucket 3 of the embodiment will be described. FIG. 2 is a perspective view of the bucket 3 viewed from the opening side. FIG. 3 is a front view of the bucket 3 viewed from the opening side. FIG. 4 is a perspective view of the bucket 3 viewed from the side opposite to the opening. FIG. 5 is a side view of the bucket 3. Note that FIG. 5 shows a state in which a side portion 31, which is a part of the components of the bucket 3, is removed. Also, the descriptions of front-rear, left-right, and up-down in the figures are based on the vehicle front-rear direction, vehicle width direction (left-right direction), and up-down direction in the state of attachment of the bucket 3 to the front body 1a shown in FIG. 1.

[0016] As shown in FIGS. 1 to 5, the bucket 3 is formed as a container-shaped member having an opening 35 that opens toward the front side in the vehicle longitudinal direction. Specifically, the bucket 3 has a pair of side surfaces 31, a curved portion 32, a bottom surface 33, and a top surface 34.

[0017] The pair of side surfaces 31 are arranged to face each other with an interval corresponding to the opening 35 in the vehicle width direction. The curved portion 32 extends in the vehicle width direction and connects the rear end portions in the vehicle longitudinal direction of the pair of side surfaces 31, that is, the end portions on the side opposite to the opening 35. As shown in FIG. 5, the curved portion 32 curves so as to have a convex shape on the side opposite to the opening 35 (the rear side in the vehicle longitudinal direction). The bottom surface 33 is disposed on the ground contact side of the wheel loader 1, extends in the vehicle width direction, and connects the lower edge portions of the pair of side surfaces 31. The bottom surface 33 extends linearly from the lower end portion of the curved portion 3 to the opening 35 side. Further, the top surface 34 is disposed to face the bottom surface 33 in the vertical direction, extends in the vehicle width direction, and connects the upper edge portions of the pair of side surfaces 31. The top surface 34 extends linearly from the upper end portion of the curved portion 3 to the opening 35 side.

[0018] Thereby, the bucket 3 can put the work object excavated at the tip of the bottom surface 33 into its interior through the opening 35 and store it, and can discharge the stored work object from the opening 35. Hereinafter, the surface on the opening 35 side where the bucket 3 stores the work object, in this embodiment, the entire inner surface of the bottom surface 33, the inner surface of the curved portion 3, and the inner surface of the top surface 34 are collectively referred to as the working surface 3a. Here, when the work object is a highly viscous substance such as mud, clay, compost, etc., the work object may adhere and remain particularly on the working surface 3a at the lower part of the corner 3C in the vehicle width direction of the bucket 3 (near the dashed line in FIGS. 2 and 3). As the work object remaining on the working surface 3a accumulates, the capacity of the load that can be loaded decreases, and the work efficiency deteriorates. Therefore, the wheel loader 1 of the embodiment has the following configuration to suppress the accumulation of the work object on the bucket 3.

[0019] (Oil circulation system) Figure 6 is an explanatory diagram showing an example of an oil circulation system 20. The oil circulation system 20 is mounted on the wheel loader 1 and includes the transaxles 12 and 13, two hydraulic pumps (pumps) 22, a valve 24, and two oil boxes 40 attached one to each of the corners 3C on both sides of the bucket 3 in the vehicle width direction.

[0020] As described above, oil for lubrication and cooling is supplied to the transaxles 12 and 13, and the oil that has lubricated and cooled the various mechanisms is stored in the lower part of the transaxles 12 and 13. One hydraulic pump 22 is provided for each transaxle 12 and 13, and it sucks up and discharges the oil stored in the lower part of each transaxle 12 and 13. Downstream of each hydraulic pump 22, there is a valve 24 that can switch between a supply state that supplies oil to each oil box 40 and a non-supply state that stops the supply of oil to each oil box 40. The oil box 40 raises the temperature of the working surface 3a of the bucket 3 with the oil supplied inside, thereby preventing the above-mentioned work objects from accumulating on the bucket 3 and becoming difficult to remove. The oil supplied to the oil box 40 is configured to be returned to the transaxles 12 and 13. Alternatively, only the oil used in either the transaxle 12 or 13 may be supplied to the oil box 40.

[0021] The hydraulic pumps 22 and valves 24 are controlled by the controller 17. When heating the bucket 3 with oil, the controller 17 drives each hydraulic pump 22 and sets the valves 24 to supply oil, thereby circulating oil within the oil circulation system 20. As a result, the oil that has lubricated and cooled the transaxles 12 and 13 and whose temperature has risen is supplied to each oil box 40, heated the bucket 3, and then returned to the transaxles 12 and 13. Consequently, the working surface 3a of the bucket 3 is heated by the oil, and the oil cooled by heat exchange can be supplied back to the transaxles 12 and 13.

[0022] On the other hand, if it is not necessary to heat the bucket 3 with oil, the controller 17 stops the hydraulic pump 22 and sets the valve 24 to the supply state. Cases where it is not necessary to heat the bucket 3 with oil include, for example, when the workpiece is a low-viscosity substance such as sand, or when the ambient temperature is high, making it unlikely that the workpiece will accumulate in the bucket 3. Whether or not it is necessary to heat the bucket 3 with oil can be selected by the operator and instructed to the controller 17, or the controller 17 may automatically determine this based on the type of workpiece, temperature, weather, etc. In addition, if it is not necessary to heat the bucket 3 with oil, the oil circulation system 20 may supply the oil that has lubricated and cooled the transaxles 12 and 13 to another cooling circuit (not shown) and return it to the transaxles 12 and 13.

[0023] (Oil box) Next, the specific configuration of the oil box 40 will be described with reference to each figure. Figure 7 is a perspective view showing the oil box 40. Figure 8 is a perspective view of the oil box 40 viewed from the opposite side of Figure 7. Figure 9 is a perspective view showing the inside of the oil box 40, and Figure 10 is an enlarged perspective view of the upper part of the inside of the oil box 40. In Figures 9 and 10, the description of the multiple lids 44, which are part of the components of the oil box 40, has been omitted. Here, the structure of the oil box 40 located on the left side in Figure 4 will be explained as an example.

[0024] The oil box 40 comprises a base portion 41, a plurality of vertical wall portions (wall portions) 42, a plurality of partition walls (wall portions) 43, and a plurality of lid portions 44. The base portion 41 is a curved plate-like member, as shown in Figures 7 to 9. The base portion 41 is formed with the same radius of curvature as the curved portion 32 of the bucket 3 described above. The plurality of vertical wall portions 42 are formed along the entire length of the edge portion extending in the longitudinal direction of the base portion 41 and rise vertically from the base portion 41.

[0025] As shown in Figure 9, the multiple partition walls 43 are arranged between the vertical wall portions 42 at predetermined intervals and rise vertically from the base portion 41. Each partition wall 43 divides the internal space of the oil box 40 into four regions A1 to A4. A hole 43a is formed at the end of each partition wall 43. The hole 43a is a through hole that connects the four regions A1 to A4 separated by each partition wall 43, and is formed to be located at opposite ends of adjacent partition walls 43. In addition, as shown in Figures 9 and 10, each vertical wall portion 42 and each partition wall 43 has multiple fins 40F that protrude vertically toward adjacent surfaces. The fins 40F are plate-shaped members that extend along the longitudinal direction of each vertical wall portion 42 and each partition wall 43. Multiple fins 40F are arranged in a row at intervals from each other in the area between the base portion 41 and the rear portion 442 (Figure 8), which will be described later.

[0026] Multiple lid portions 44 are positioned one at a time in the gaps between the vertical wall portion 42 and the adjacent partition wall 43, and in the gaps between adjacent partition walls 43, and are members that close these gaps. Each lid portion 44 has a pair of contact portions 441 (Figure 7) that abut perpendicularly against the base portion 41, and a rear portion 442 (Figure 8) that connects the pair of contact portions 441. Each contact portion 441 forms the upper and lower ends of the oil box 40 when it is attached to the bucket 3. Each contact portion 441 is provided with an L-shaped bracket 45 that serves as an attachment point to the bucket 3. The rear portion 442 is positioned at a distance from the base portion 41, facing it, and forms the side of the oil box 40 opposite to the base portion 41. A drain port 48 that can be opened and closed is provided at the bottom of the rear portion 442 for draining oil from inside the oil box 40, for example, during maintenance such as replacing the oil box 40. The oil box 40 only needs to be replaced when the circuit board portion 41 wears down to a predetermined thickness or more.

[0027] The base portion 41, multiple vertical wall portions 42, multiple partition walls 43, and multiple lid portions 44 are joined to each other to form an oil box 40 with defined internal space. Oil is supplied to and discharged from the internal space of the oil box 40 through inlet ports 46 and outlet ports 47. An inlet pipe 51 extending from a valve 24 is connected to each inlet port 46. An outlet pipe 52 that returns the oil to the transaxles 12 and 13 is connected to each outlet port 47. In this embodiment, the inlet ports 46 and outlet ports 47 are provided on a contact portion 441 that constitutes the upper end of the oil box 40.

[0028] Specifically, the inlet port 46 is positioned at the outer end in the vehicle width direction when the oil box 40 is attached to the bucket 3, and communicates with region A1, which is the outermost region in the vehicle width direction among the four regions A1 to A4 (Figure 9). On the other hand, the outlet port 47 is positioned at the inner end in the vehicle width direction when the oil box 40 is attached to the bucket 3, and communicates with region A4, which is the innermost region in the vehicle width direction among the four regions A1 to A4 (Figure 9).

[0029] As a result, the oil that flows into the internal space of the oil box 40 from the inlet port 46 flows from top to bottom through region A1, flows into the adjacent region A2 through the hole 43a formed in the partition wall 43, flows from bottom to top through region A2, and then flows into the adjacent region A3 through the hole 43a. Furthermore, the oil flows from top to bottom through region A3 and flows into the adjacent region A4 through the hole 43a, flows from bottom to top through region A4 and is discharged to the outside through the outlet port 47. In this way, in the oil box 40 of this embodiment, a winding path is formed so that the oil spreads throughout the entire internal space between the inlet port 46 and the outlet port 47. As a result, the accumulation of oil in a part of the internal space is suppressed.

[0030] In this explanation, we used the oil box 40 located on the left side of Figure 4 as an example, referring to the left port in Figure 9 as the inlet port 46 and the right port as the outlet port 47. However, in the oil box 40 located on the right side of Figure 4, the positional relationship between the inlet port 46 and the outlet port 47 is reversed in the vehicle width direction compared to the example shown in Figure 9. That is, the right port in Figure 9 becomes the inlet port 46 to which the inlet pipe 51 is connected, and the left port in Figure 9 becomes the outlet port 47 to which the outlet pipe 52 is connected, resulting in the oil flow being in the opposite direction to what was explained above.

[0031] (Mounting structure of the oil box) Next, the mounting structure of the oil box 40 to the bucket 3 will be described. As schematically shown in Figures 2 and 3, at the corners 3C located at both ends of the bucket 3 in the vehicle width direction, through holes 38 are formed adjacent to the side portion 31, by cutting out a part of the curved portion 32. The through holes 38 are formed adjacent to the side portion 31 and at the bottom of the curved portion 32. The through holes 38 are the part that accommodates the base portion 41 of the oil box 40, and are formed along the outer edge of the base portion 41. However, considering the ease of attaching and detaching the oil box 40, a gap of about 2 to 3 mm is provided between the through holes 38 and the base portion 41. In Figures 2 and 3, for illustrative purposes, the gap between the through holes 38 and the base portion 41 is made larger than it actually is. When the workpiece is a highly viscous substance, the workpiece is less likely to leak out through this gap, so there is little risk of reduced workability. On the other hand, if the workpiece is a low-viscosity substance such as sand, and it is not necessary to heat bucket 3 with oil, the gap may be temporarily sealed with a silicone material or the like.

[0032] As shown in Figures 4 and 5, the oil box 40 has a base plate portion 41 that passes through the through hole 38, with the portion other than the base plate portion 41 protruding to the outside of the bucket 3. The oil box 40 is fixed to the bucket 3 by the bracket 45 abutting against mounting portions 39 provided on the curved portion 32 and the bottom portion 33, respectively, and by fastening the mounting portions 39 and the bracket 45 together with multiple bolts. In this embodiment, the bottom portion 33 of the bucket 3 is tapered so as it extends upward from the opening 35 side toward the curved portion 32, and the mounting portions 39 and bracket 45 can be positioned within the height range of this tapered portion. Therefore, it is possible to position the oil box 40 close to the bottom portion 33, that is, at the bottom of the bucket 3, while suppressing the mounting portions 39 and bracket 45 from protruding from the lower end of the bucket 3.

[0033] As shown in Figure 5, the oil box 40 has a base plate 41 that forms part of the work surface 3a. That is, the oil box 40 is attached to the bucket 3 such that the surface of the base plate 41 on the opening 35 side is approximately flush with the other work surface 3a. The base plate 41 and the other work surface 3a do not need to be perfectly flush, but if a step is formed between the base plate 41 and the other work surface 3a, it may become a starting point for the accumulation of the work material. Therefore, it is preferable that the oil box 40 does not have a step formed between the base plate 41 and the other work surface 3a as much as possible, and that no corners (sharp parts) are formed on the surface of the base plate 41 itself.

[0034] (Effects of the embodiment) As described above, the wheel loader (working machine) 1 of the embodiment comprises a front body 1a and a rear body 1b, and a working device 2 that is pivotably attached to the front body 1a and has a bucket 3 at its tip. The wheel loader 1 is positioned so as to form a part of the working surface 3a of the bucket 3 through a through hole 38 formed by cutting out the bucket 3, and also comprises an oil box 40 through which oil used in the front body 1a and rear body 1b is circulated and supplied, and a hydraulic pump (pump) 22 for circulating the oil.

[0035] In this configuration, the oil that has been lubricated and cooled the transaxles 12 and 13 and has become hot is supplied to and discharged into each oil box 40, and the working surface 3a of the bucket 3 is heated. As a result, the workpiece on the working surface 3a is dried and its stickiness is reduced. Consequently, the residue of the workpiece on the working surface 3a is suppressed, and any remaining workpiece can be easily peeled off the working surface 3a.

[0036] Furthermore, if an electric heater is used to raise the temperature of the bucket 3, for example, it may be necessary to additionally install a battery as a power supply on the wheel loader 1. In particular, when a relatively large bucket 3 such as that of the wheel loader 1 is used, an electric heater tends to lead to a larger battery. In this embodiment, since the oil for lubricating and cooling the transaxles 12 and 13 is supplied to the oil box 40, an additional battery is not required, and the space constraints on the wheel loader 1 can be suppressed.

[0037] Furthermore, if, for example, exhaust heat from the engine 11 mounted on the rear vehicle body 1b is supplied to the bucket 3 to raise its temperature, laying an exhaust pipe from the engine 11 to the bucket can be difficult, and there is a risk that heat may not be sufficiently transferred through the exhaust pipe. In this embodiment, flexible hydraulic hoses can be used for at least a portion of the inlet pipe 51 and outlet pipe 52 for supplying and discharging oil, making the installation easier compared to using an exhaust pipe. In addition, by using oil that does not cool down as easily as the exhaust heat from the engine 11, the working surface 3a of the bucket 3 can be heated more effectively.

[0038] As described above, the wheel loader 1 and bucket 3 of this embodiment can more effectively suppress the accumulation of workpieces in the bucket 3 with a simple configuration. In addition, the oil used for lubrication and cooling of the transaxles 12 and 13 can be cooled by heat exchange, improving product life even in environments where the oil temperature tends to rise. Furthermore, by raising the temperature of the work surface 3a as described above, it is also possible to prevent the work surface 3a from freezing when the wheel loader 1 is operated in a low-temperature environment.

[0039] Furthermore, the oil boxes 40 are provided at the corners 3C on both sides of the bucket 3 in the vehicle width direction. This configuration makes it possible to more effectively suppress the accumulation of work material at the corners 3C. Note that the oil boxes 40 may be provided at only one of the corners 3C of the bucket 3. Even in that case, it is possible to suppress the accumulation of work material at least at one of the corners 3C.

[0040] Furthermore, the bucket 3 has a straight-extending bottom portion 33 and a curved portion 32 that curves upward from the bottom portion 33, and the oil box 40 is attached to the lower part of the curved portion 32. This configuration makes it possible to better suppress the accumulation of work material at the bottom of the bucket 3.

[0041] Furthermore, the oil box 40 is provided with an oil inlet port 46 at its outer end in the vehicle width direction and an oil outlet port 47 at its inner end in the vehicle width direction. This configuration allows relatively high-temperature oil to flow into the oil box 40 from the outer end in the vehicle width direction. As a result, the portion of the bucket 3 located further out in the vehicle width direction can be effectively heated, suppressing the accumulation of workpieces.

[0042] Furthermore, the oil box 40 is provided with multiple partition walls 43 that define the oil flow path from the oil inlet port 46 to the oil outlet port 47. This configuration allows the oil to flow along the paths of the regions A1 to A4 separated by the multiple partition walls 43, thus suppressing oil stagnation in parts of the oil box 40 compared to simply filling the oil box 40 with oil. As a result, the oil box 40 can be heated as evenly as possible. In addition, the heat from the oil is effectively transferred to the oil box 40 via the multiple partition walls 43, which in turn allows the work surface 3a to be heated more efficiently.

[0043] Furthermore, multiple fins 40F are formed on the walls of the oil box 40, namely the vertical wall 42 and the multiple partition walls 43. This configuration effectively transfers the heat from the oil to the vertical wall 42 and the multiple partition walls 43 via the multiple fins 40F, thereby enabling the working surface 3a to be heated even more effectively.

[0044] Figure 11 is an explanatory diagram showing an oil circulation system 200 according to a modified example. As shown in the figure, the oil circulation system 200 replaces the transaxles 12 and 13 of the oil circulation system 20 shown in Figure 6 with a hydraulic oil tank 18, the hydraulic pump 22 with a main pump 15, and the valve 24 with a multi-control valve 16. In this example, the multi-control valve 16, which supplies hydraulic oil to various hydraulic devices such as the arm cylinder 7 and the bucket cylinder 5, is configured to supply hydraulic oil to each oil box 40 as needed. This allows the hydraulic oil used in the various hydraulic devices, which has become hotter, to be supplied to each oil box 40, thereby raising the temperature of the working surface 3a of the bucket 3. In addition, the hydraulic oil supplied to each oil box 40 can be cooled by heat exchange and returned to the hydraulic oil tank. Thus, the oil supplied to the oil box 40 may be the hydraulic oil used in the various hydraulic devices.

[0045] This concludes the description of the embodiments, but the aspects of the present invention are not limited to these embodiments. For example, although the present embodiment applies the present invention to a wheel loader 1, the present invention may also be applied to other work machines, such as a hydraulic excavator, which includes a vehicle body comprising a lower traveling body and an upper rotating body rotatably mounted on the lower traveling body, and a work device that is swingably attached to the vehicle body and has a bucket at its tip.

[0046] Furthermore, in this embodiment, the oil boxes 40 are attached to the corners 3C on both sides of the bucket 3 in the vehicle width direction, but the mounting position of the oil boxes 40 is not limited to this. The oil boxes 40 only need to form at least a part of the working surface 3a, and may be attached to the bucket 3 so as to form a part of the side surface 31 or a part of the bottom surface 33, for example.

[0047] Furthermore, the relative positions of the inlet port 46 and the outlet port 47 in the vehicle width direction may be reversed. In addition, in this embodiment, the inlet port 46, the outlet port 47 and the multiple partition walls 43 are provided so that the internal space of the oil box 40 is divided into regions A1 to A4, forming a zigzag oil path. However, the formation positions of the inlet port 46 and the outlet port 47, and the arrangement, shape, and number of the multiple partition walls 43 are not limited to the examples shown in this embodiment. The inlet port 46, the outlet port 47 and the multiple partition walls 43 only need to be capable of forming a flow that allows oil to spread as much as possible throughout the internal space of the oil box 40. Also, if there is no risk of oil accumulating in a part of the internal space, the multiple partition walls 43 may be omitted. Furthermore, if sufficient heat can be transferred to the oil box 40, the multiple fins 40F may be omitted. [Explanation of Symbols]

[0048] 1. Wheel loader (working machine) 1a Front body (body) 1b Rear body (body) 2. Working equipment 3 buckets 3a work surface 3C corner 15. Main pump (pump) 22. Hydraulic pump (pump) 31 Side part 32 Curved section 33 Bottom part 34 Top section 35 Aperture 38 Through holes 39 Mounting part 40 Oil Box 41 Circuit board section 42 Vertical wall section (wall section) 43 Bulkhead (wall) 43a Hole 44 Lid 45 Bracket 46 Inflow Ports 47 Leakage Ports 51 Inlet piping 52 Outlet piping

Claims

1. A work machine comprising a vehicle body and a work device that is swingably attached to the vehicle body and has a bucket at its tip, An oil box is positioned to form a part of the working surface of the bucket through a through hole formed by cutting out the bucket, and oil used in at least one of the vehicle body and the working device is circulated and supplied to it. A pump for circulating the aforementioned oil, A work machine characterized by being equipped with the following features.

2. The work machine according to claim 1, characterized in that the oil box is provided at the corner of the bucket in the vehicle width direction.

3. The work machine according to claim 2, characterized in that the oil box is provided at the corners of the bucket on both sides in the vehicle width direction of the vehicle body.

4. The bucket has a bottom portion that extends in a straight line and a curved portion that extends upward from the bottom portion while curving, The oil box is located at the lower part of the curved section. The work machine according to feature 1.

5. The work machine according to claim 1, characterized in that the oil box has an oil inlet port at the outer end in the vehicle width direction and an oil outlet port at the inner end in the vehicle width direction.

6. The working machine according to claim 1, characterized in that the inside of the oil box is provided with a plurality of partitions that define a path through which the oil flows, from the oil inlet port to the oil outlet port.

7. The working machine according to claim 1, characterized in that a plurality of fins are formed on the wall portion of the oil box.

8. A bucket attached to a work device of a work machine, A bucket characterized by having an oil box that is positioned to form a part of the working surface of the bucket through a through hole formed by cutting out the bucket, and through which oil used in the work machine is circulated and supplied.

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