Work machinery

Abstract

To provide a work machine capable of restricting access to a filler port and an air breather of a hydraulic oil tank with a simple structure.SOLUTION: A work machine comprises a box body (20) supported on an upper surface of a hydraulic oil tank so as to cover a filler port and an air breather (15). The box body (20) includes: an opening / closing door (27) movable between a closed position that closes an internal space (21) of the box body (20) and an open position that opens the internal space (21); and a lock mechanism (30) that can be displaced between a locked state in which the opening / closing door (27) is locked at the closed position and a movement permitting state that permits movement of the opening / closing door (27) between the closed position and the open position.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a work machine equipped with a hydraulic oil tank. [Background technology]

[0002] Conventionally, there has been known a working machine that includes a hydraulic oil tank having a storage space for storing hydraulic oil, a hydraulic actuator that operates when the hydraulic oil in the hydraulic oil tank is supplied by a hydraulic pump, and a vehicle body that supports the hydraulic oil tank and the hydraulic actuator (see, for example, Patent Document 1).

[0003] Some of these work machines are equipped with a locking device that locks the cap in order to prevent theft of hydraulic oil from the hydraulic oil tank and the intrusion of foreign objects into the hydraulic oil tank (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-264541 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-24966 Summary of the Invention [Problem to be solved by the invention]

[0005] A typical hydraulic oil tank is provided with a filler port that supplies hydraulic oil to a storage space and an air breather that adjusts the pressure in the storage space. To prevent theft of hydraulic oil or the intrusion of foreign objects, it is necessary to provide locking devices on both the filler port and the air breather. However, due to the characteristics of the structure that bleeds air from the storage space, it is difficult to provide a locking device directly on the air breather.

[0006] The present invention has been made in consideration of the above-described circumstances, and its object is to provide a work machine that is capable of regulating access to the oil filler port and air breather of a hydraulic oil tank with a simple structure. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a work machine comprising a hydraulic oil tank having a storage space for storing hydraulic oil, a hydraulic actuator that is operated by a hydraulic pump supplied with hydraulic oil from the hydraulic oil tank, and a vehicle body that supports the hydraulic oil tank and the hydraulic actuator, and the hydraulic oil tank supported on the vehicle body is provided on its upper surface with a filler port that supplies hydraulic oil into the storage space and an air breather that adjusts the pressure within the storage space. and is provided so as to protrude upward from the upper surface of the hydraulic oil tank. The box has an opening / closing door that can move between a closed position that closes the internal space of the box and an open position that opens the internal space, and a locking mechanism that can be displaced between a locked state that locks the opening / closing door at the closed position and a movement allowing state that allows movement between the closed position and the open position. The hydraulic oil tank is located above the scaffolding provided on the upper surface of the upper rotating body. It is characterized by the following. [Effects of the Invention]

[0008] According to the present invention, it is possible to restrict access to the oil filler port and air breather of the hydraulic oil tank with a simple structure. Note that problems, configurations, and effects other than those described above will become apparent from the description of the following embodiments. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a side view of a hydraulic excavator, which is a representative example of a work machine according to the present invention. [Figure 2] FIG. 2 is a schematic diagram showing the relationship between components of a hydraulic excavator. [Figure 3] FIG. 2 is a perspective view of a main part of the upper surface of the upper rotating body with the tool box removed. [Figure 4]FIG. 2 is a perspective view of a main part of the upper surface of the upper rotating body with the tool box attached. [Figure 5] FIG. 2 is a perspective view of the tool box with the door in the open position. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of a work machine according to the present invention will be described with reference to the drawings. Fig. 1 is a side view of a hydraulic excavator 1, which is a representative example of a work machine according to the present invention. In this specification, front, back, left, and right are based on the viewpoint of an operator who is on board and operating the hydraulic excavator 1, unless otherwise specified.

[0011] The hydraulic excavator 1 includes a lower traveling body 2 and an upper rotating body 3 supported by the lower traveling body 2. The lower traveling body 2 and the upper rotating body 3 are an example of a vehicle body. The lower traveling body 2 includes a pair of left and right crawlers. When the rotation of a traveling motor 2a (see FIG. 2) is transmitted to rotate the pair of left and right crawlers, the hydraulic excavator 1 travels. However, the lower traveling body 2 may be a wheeled type instead of a crawler type.

[0012] The upper rotating body 3 is rotatably supported on the lower traveling body 2. The driving force of a swing motor 3a (see FIG. 2) is transmitted to the upper rotating body 3, causing it to swing relative to the lower traveling body 2. The upper rotating body 3 mainly comprises a swing frame 5 serving as a base, a front working implement 4 attached to the center of the front end of the swing frame 5 so as to be able to swing up and down, a cab (operator's seat) 7 located on the front left side of the swing frame 5, and a counterweight 6 located at the rear end of the swing frame 5.

[0013] The front working implement 4 includes a boom 4a supported on the upper rotating body 3 so that it can be raised and lowered, an arm 4b supported swingably at the tip of the boom 4a, a bucket 4c supported swingably at the tip of the arm 4b, and hydraulic cylinders 4d, 4e, and 4f that drive the boom 4a, arm 4b, and bucket 4c. The counterweight 6 is used to balance the weight of the front working implement 4, and is a heavy object that has an arc shape when viewed from above.

[0014] The cab 7 has an internal space in which an operator who operates the hydraulic excavator 1 sits. Inside the cab 7, there is a seat (not shown) on which the operator sits, and operating devices (steering wheel, pedals, levers, switches, etc.) that the operator seated in the seat operates. When the operator sitting in the cab 7 operates the operating devices, the lower traveling body 2 travels, the upper rotating body 3 rotates, and the front working implement 4 operates.

[0015] The upper rotating body 3 also supports an engine building 8 that houses components that drive the hydraulic excavator 1 (for example, the engine 8a and hydraulic pump 8b shown in FIG. 2), a fuel tank 9 that stores fuel (for example, diesel) that is supplied to the engine 8a, and a hydraulic oil tank 10 that stores hydraulic oil that is supplied to the hydraulic actuators (for example, the travel motor 2a, the swing motor 3a, and the hydraulic cylinders 4d, 4e, and 4f) through the hydraulic pump 8b and that is discharged from the hydraulic actuators 2a, 3a, and 4d to 4f.

[0016] The engine building 8 is supported by the rotating frame 5 rearward of the front work implement 4 and the cab 7 and forward of the counterweight 6. The fuel tank 9 is disposed at the right end of the upper rotating body 3, forward of the engine building 8 and the hydraulic oil tank 10. The hydraulic oil tank 10 is disposed at the right end of the upper rotating body 3, forward of the engine building 8 and rearward of the fuel tank 9. The top surfaces of the fuel tank 9 and the hydraulic oil tank 10 are exposed from the upper rotating body 3.

[0017] 2 is a schematic diagram showing the relationship between the components of the hydraulic excavator 1. The engine 8a generates driving force for driving the hydraulic excavator 1 by mixing and burning fuel stored in a fuel tank 9 with air. The driving force of the engine 8a is transmitted to the hydraulic pump 8b, which supplies hydraulic oil stored in a hydraulic oil tank 10 to the hydraulic actuators 2a, 3a, 4d to 4f.

[0018] Furthermore, a first key cylinder 7a and an ignition switch 7b for starting the engine 8a are installed in the cab 7. The operator inserts a key 7c into the first key cylinder 7a and turns it to switch the state (START, ON, OFF) of the ignition switch 7b.

[0019] When the ignition switch 7b is switched from OFF to START, the engine 8a starts. When the ignition switch 7b is switched from START to ON, the engine 8a continues to operate and power is supplied to each part of the hydraulic excavator 1. When the ignition switch 7b is switched from ON to OFF, the engine 8a stops.

[0020] The hydraulic oil tank 10 is, for example, a box-shaped tank with a rectangular parallelepiped outer shape. The hydraulic oil tank 10 has a storage space 11 therein for storing hydraulic oil. An outflow path 12 is connected to the bottom surface of the hydraulic oil tank 10, through which the hydraulic oil stored in the storage space 11 flows out to the hydraulic pump 8b. In addition, an inflow port 13 is connected to the side surface of the hydraulic oil tank 10, through which the hydraulic oil discharged from the hydraulic actuators 2a, 3a, 4d to 4f flows into the storage space 11. Furthermore, an oil filler port 14 and an air breather 15 are provided on the top surface of the hydraulic oil tank 10.

[0021] 3 is a perspective view of the main parts of the upper surface of the upper rotating body 3 with the tool box 20 removed. The oil fill port 14 is an opening for supplying hydraulic oil into the storage space 11 and is closed by a removable cap 16. The air breather 15 adjusts the pressure in the storage space 11. More specifically, the air breather 15 discharges air in the storage space 11 to the outside of the hydraulic oil tank 10 when the pressure in the storage space 11 increases, and allows outside air to flow into the storage space 11 when the pressure in the storage space 11 decreases.

[0022] Additionally, a plurality of steps 17a, 17b, and 17c are provided around the hydraulic oil tank 10 on the upper surface 3b (body cover) of the upper rotating body 3. The steps 17a to 17c serve as footholds for an operator performing maintenance on the hydraulic excavator 1 (for example, supplying hydraulic oil through the oil filler port 14, replacing filters arranged inside the oil filler port 14 and the air breather 15, and inspecting components housed in the engine building 8).

[0023] 1, handrails 18a, 18b, and 18c are erected along the right edge of the upper rotating body 3. The handrails 18a to 18c function as fall prevention fences that prevent operators on the steps 17a to 17c from falling from the upper rotating body 3. In this embodiment, the handrails 18a and 18b are erected directly on the upper surface 3b of the upper rotating body 3, and the handrail 18c is erected on the upper surface (upper wall 22) of a tool box 20, which will be described later.

[0024] 3, a plurality of brackets 19a, 19b, and 19c are attached to the upper surface of the hydraulic tank 10. The upper ends of the brackets 19a to 19c are located at a position lower than the upper end of the air breather 15 and higher than the upper end of the cap 16. The brackets 19a to 19c function as a support base for supporting a tool box 20, which will be described later. As shown in FIG. 1, the tool box 20 is supported on the upper surface of the hydraulic tank 10 (i.e., by the brackets 19a to 19c) so as to cover the oil filler opening 14 and the air breather 15.

[0025] Fig. 4 is a perspective view of the main parts of the upper surface of the upper rotating body 3 with the tool box 20 attached. Fig. 5 is a perspective view of the tool box 20 with the opening and closing door 27 in the open position. The tool box 20 is a box body having an internal space 21 for accommodating tools for performing maintenance on the hydraulic excavator 1. The internal space 21 of the tool box 20 is defined by a top wall 22, a bottom wall 23, side walls 24, 25, 26, and the opening and closing door 27.

[0026] More specifically, the top wall 22 defines the ceiling surface of the internal space 21. The bottom wall 23 defines the bottom surface of the internal space 21. The side walls 24, 25, and 26 define the side surfaces (front, right, and rear surfaces) of the internal space 21. The opening and closing door 27 in the closed position defines the side surface (left surface) of the internal space 21. The tool box 20 is detachably fastened to the top surface of the hydraulic oil tank 10 (more specifically, to brackets 19a to 19c) by a plurality of bolts 28 inserted into through-holes that penetrate the bottom wall 23. That is, the top surface of the tool box 20 is located above the top surface 3b of the upper rotating body 3 (the body cover that covers the hydraulic oil tank 10). The heads of the bolts 28 are located within the internal space 21.

[0027] An opening 23a is also formed in the bottom wall 23. The opening 23a allows the air breather 15 to enter the internal space 21 of the tool box 20. Furthermore, partition walls 29a, 29b, 29c, and 29d are formed in the internal space 21 of the tool box 20. The partition walls 29a to 29d surround a portion of the air breather 15 that has entered through the opening 23a.

[0028] More specifically, partitions 29a, 29b, and 29c are erected around (front, right, and rear) opening 23a. Partition 29d is connected to the upper ends of partitions 29a to 29c above air breather 15. That is, partitions 29a to 29d separate internal space 21 of tool box 20 into a space that houses air breather 15 and a space that houses tools. However, partitions 29a to 29d do not completely surround air breather 15, and allow air to pass between storage space 11 of hydraulic oil tank 10 and internal space of tool box 20.

[0029] The opening / closing door 27 is configured to be movable (rotatable) between a closed position shown in Fig. 4 and an open position shown in Fig. 5. The opening / closing door 27 according to this embodiment is rotatably supported on the bottom wall 23 by hinges 27a and 27b attached to the left end of the bottom wall 23. However, the opening / closing door 27 is not limited to being rotatable between the closed position and the open position, and may be slidable or detachable.

[0030] The door 27 in the closed position closes the internal space 21 of the tool box 20. The door 27 in the closed position defines the side (left side) of the tool box 20. Therefore, when the door 27 is placed in the closed position, the operator cannot access the tools and bolts 28 stored in the internal space 21. When the door 27 is in the closed position, the tool box 20 is sealed to an extent that rain and water droplets can be prevented from entering the internal space 21 to some extent, but gaps are provided to allow air to pass through.

[0031] The opening / closing door 27 in the open position opens the internal space 21 (left side) of the tool box 20. Therefore, when the opening / closing door 27 is placed in the open position, the operator can access the tools and bolts 28 stored in the internal space 21. To remove the tool box 20 from the top surface of the hydraulic oil tank 10, it is necessary to operate and remove the heads of the bolts 28, and to remove the bolts 28, it is necessary to move the opening / closing door 27 to the open position.

[0032] Furthermore, the tool box 20 is provided with a locking mechanism 30. The locking mechanism 30 is configured to be able to be displaced between a locked state and a movement-permitted state. In the locked state, the locking mechanism 30 locks the opening / closing door 27 in the closed position. In the movement-permitted state, the locking mechanism 30 permits the opening / closing door 27 to move between the closed position and the open position. The locking mechanism 30 mainly includes a locking portion 31, a locked portion 32, a second key cylinder 33, and a locking piece 34.

[0033] The locking portion 31 is attached to the left end of the outer surface of the upper wall 22. The locked portion 32 is attached to the pivot tip of the opening and closing door 27. When the opening and closing door 27 is in the closed position, an operator can operate the locking portion 31 to switch between locking and unlocking the locked portion 32 by the locking portion 31.

[0034] The second key cylinder 33 is attached to the door 27. The key insertion port of the second key cylinder 33 is exposed on the outer surface of the door 27. The lock piece 34 is attached to the second key cylinder 33 on the inner surface of the door 27 (i.e., in the internal space 21 of the tool box 20). The operator can then insert the key 7c into the second key cylinder 33 and rotate it to engage (lock) or disengage (unlock) the lock piece 34 with the inner surface of the side wall 25.

[0035] That is, the locking mechanism 30 is placed in a locked state by engaging the locked portion 32 with the locking portion 31 and engaging the locking piece 34 with the inner surface of the side wall 25. On the other hand, the locking mechanism 30 is placed in a movement-permitted state by releasing the locking portion 31 from the locked portion 32 and releasing the engagement of the locking piece 34 with the inner surface of the side wall 25. In this embodiment, the first key cylinder 7a and the second key cylinder 33 can be rotated with a common key 7c.

[0036] According to the above embodiment, by covering the fuel filler opening 14 and the air breather 15 with the tool box 20, it is not possible to access the fuel filler opening 14 and the air breather 15 without removing the tool box 20. As a result, theft of hydraulic oil from the hydraulic oil tank 10 and the introduction of foreign matter into the hydraulic oil tank 10 can be restricted with a simple configuration.

[0037] More specifically, the bottom wall 23 is fastened to the brackets 19a to 19c with bolts 28, and a locking mechanism 30 is provided on the opening / closing door 27. Therefore, in order to access the fuel filler opening 14 and the air breather 15, it is necessary to switch the locking mechanism 30 to a movement-permitting state, move the opening / closing door to the open position, and then remove the bolts 28 to remove the tool box 20. However, the method of fixing the tool box 20 to the hydraulic oil tank 10 is not limited to the bolts 28.

[0038] Furthermore, according to the above embodiment, the state of the locking mechanism 30 can be switched using the key 7c for starting the engine 8a. When the hydraulic excavator 1 is parked, the key 7c is kept by the operator or at the business premises, and therefore, it is possible to effectively prevent an unauthorized third party from moving the opening and closing door 27 to the open position (in other words, from accessing the fuel filler opening 14 and the air breather 15). However, the key 7c for starting the engine 8a and the key for switching the state of the locking mechanism 30 may be different.

[0039] Furthermore, according to the above embodiment, the air breather 15 that has entered the internal space 21 of the tool box 20 through the opening 23a is covered with the partitions 29a to 29d, thereby preventing the air breather 15 from being damaged by the tools stored in the tool box 20.

[0040] Furthermore, according to the above embodiment, the tool box 20 for storing tools is placed on the upper rotating body 3. This eliminates the need for the operator to carry tools required for maintenance up and down to the upper rotating body 3. However, the box is not limited to the tool box 20 for storing tools, and may be one for storing any object.

[0041] Furthermore, according to the above embodiment, by positioning the upper wall 22 of the tool box 20 at a position higher than the steps 17a to 17c, the tool box 20 can be made to play the role of preventing the operator on the steps 17a to 17c from falling off the upper rotating body 3.

[0042] Furthermore, according to the above embodiment, by providing the handrail 18c upright on the upper wall 22 of the tool box 20, the height of the handrail 18c can be reduced compared to the handrails 18a and 18b, thereby reducing the stress applied to the handrail 18c and the material costs.

[0043] In the above embodiment, an example has been described in which the tool box 20 needs to be removed in order to access the fuel filler opening 14 and the air breather 15. However, a configuration may be possible in which the fuel filler opening 14 and the air breather 15 are accessible without removing the tool box 20 (in other words, by simply moving the opening / closing door 27 to the open position).

[0044] In this case, the fuel filler cap 14 and the air breather 15 are allowed to enter the internal space 21 of the tool box 20 by providing an opening in the bottom wall 23 or by omitting the bottom wall 23. Also, the top wall 22 is made to be an opening / closing door so that the opening / closing door in the closed position defines the upper surface of the internal space 21. This makes it possible to access the fuel filler cap 14 and the air breather 15 simply by moving the opening / closing door to the open position without removing the tool box 20. As a result, maintenance work on the fuel filler cap 14 and the air breather 15 is facilitated.

[0045] In the above-described embodiment, the hydraulic excavator 1 equipped with a crawler-type undercarriage 2 has been described as an example of a work machine. However, the present invention is not limited to this, and may be applied to, for example, a hydraulic excavator equipped with a wheel-type undercarriage. In addition, the present invention can be widely applied to other work machines such as wheel loaders, dump trucks, and hydraulic cranes.

[0046] The above-described embodiments are merely illustrative examples of the present invention, and are not intended to limit the scope of the present invention to these embodiments. Those skilled in the art can implement the present invention in various other forms without departing from the spirit of the present invention. [Explanation of symbols]

[0047] 1 Hydraulic excavator (work machine) 2 Undercarriage (car body) 2a Travel motor (hydraulic actuator) 3 Upper rotating body (car body) 3a Swing motor (hydraulic actuator) 3b Top (body cover) 4 Front work equipment 4a Boom 4b Arm 4c Bucket 4d, 4e, 4f Hydraulic cylinder (hydraulic actuator) 5 Swivel frame 6 Counterweight 7 Cab 7a No. 1 key cylinder 7b Ignition switch 7c key 8 Engine Building 8a engine 8b Hydraulic pump 9. Fuel Tank 10 Hydraulic oil tank 11 Storage space 12 Outflow channel 13 Inlet 14 Fuel filler cap 15 Air Breather 16 Cap Steps 17a, 17b, and 17c 18a, 18b, 18c Handrails 19a, 19b, 19c brackets 20 Tool box (box body) 21 Interior Space 22 Upper Wall 23 Bottom wall 23a opening 24,25,26 side wall 27 Opening and Closing Doors 27a, 27b hinge 28 volts 29a,29b,29c,29d Bulkhead 30 Locking mechanism 31 Locking part 32 Locked part 33 Second key cylinder 34 Lock piece

Claims

1. A work machine comprising: a hydraulic oil tank having a storage space for storing hydraulic oil; a hydraulic actuator that operates when hydraulic oil in the hydraulic oil tank is supplied by a hydraulic pump; and a vehicle body that supports the hydraulic oil tank and the hydraulic actuator, wherein an oil filler port that supplies hydraulic oil into the storage space and an air breather that adjusts the pressure in the storage space are provided on an upper surface of the hydraulic oil tank supported on the vehicle body, a box body supported on an upper surface of the hydraulic oil tank and protruding upward from the upper surface of the hydraulic oil tank so as to cover the fuel filler port and the air breather; The box body is an opening / closing door that is movable between a closed position that closes the internal space of the box body and an open position that opens the internal space; a locking mechanism that is displaceable between a locked state in which the opening / closing door is locked at the closed position and a movement allowing state in which the opening / closing door is allowed to move between the closed position and the open position, A work machine characterized in that the hydraulic oil tank protrudes above a scaffolding provided on the top surface of the upper rotating body around the hydraulic oil tank.

2. In the work machine described in claim 1, the hydraulic oil tank is disposed at the right end of the vehicle body, The box body is a bottom wall defining a bottom surface of the internal space; a sidewall defining a side surface of the interior space; an upper wall defining an upper surface of the interior space; the bottom wall is detachably fixed to an upper surface of the hydraulic oil tank by a bolt, and covers the oil filler port and the air breather while being fixed to the upper surface of the hydraulic oil tank; A work machine characterized in that the opening and closing door defines the left side of the internal space.

3. 2. The work machine according to claim 1, The box body has a bottom wall that defines a bottom surface of the internal space, the bottom wall is fastened to the top surface of the hydraulic oil tank by bolts; A work machine characterized in that the head of the bolt is located in the internal space of the box body.

4. 4. The work machine according to claim 3, an opening for allowing the air breather to enter the internal space is formed in the bottom wall; a partition wall is formed in the internal space to surround a portion of the air breather that enters through the opening.

5. 2. The work machine according to claim 1, The box body is a bottom wall defining a bottom surface of the internal space; a sidewall defining a side surface of the interior space; an upper wall defining an upper surface of the interior space; the bottom wall is detachably fixed to an upper surface of the hydraulic oil tank by a bolt, and covers the oil filler port and the air breather while being fixed to the upper surface of the hydraulic oil tank; A work machine characterized in that an upper surface of the upper wall supports a handrail.

6. 2. The work machine according to claim 1, an engine that generates driving force to operate the work machine; a first key cylinder into which a key is inserted and turned to start or stop the engine; A work machine characterized in that the locking mechanism includes a second key cylinder that switches between the locked state and the movement permitted state by inserting and rotating the key.

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