Hydraulic oil tank structure

Abstract

To provide a hydraulic fluid tank structure capable of suppressing entry of water and foreign matters, which have been mixed in a hydraulic fluid tank, into a hydraulic circuit together with a hydraulic fluid.SOLUTION: A hydraulic fluid tank includes a tank body, and a suction oil passage part 2. The tank body includes a tank bottom surface 11 where an opening is formed, and stores a hydraulic fluid HF. The suction oil passage part 2 is provided at the tank bottom surface 11. The suction oil passage part 2 includes: a suction filter 4 for filtering the hydraulic fluid HF; and a water receiving container 6 provided integrally with the suction filter 4 on the lower side of the suction filter 4. The water receiving container 6 includes a container bottom surface 61, and a container side surface where an intake port 62H is formed. The container bottom surface 61 is arranged below the tank bottom surface 11. The water receiving container 6 is constituted as a deposition chamber for water and foreign matters.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a structure of a hydraulic oil tank mounted on a work machine such as a hydraulic excavator. [Background technology]

[0002] Conventionally, techniques related to hydraulic oil tanks mounted on work machines such as hydraulic excavators have been proposed. For example, Patent Document 1 discloses a tank device including a tank body (12) for storing liquid, a suction pipe (13) through which the liquid sucked into a pump flows, and a suction filter (14) for purifying the liquid flowing through the suction pipe (13). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-185130 Summary of the Invention [Problem to be solved by the invention]

[0004] However, water and foreign matter that gets into the hydraulic oil tank is heavier than the hydraulic oil stored in the hydraulic oil tank, and therefore sinks and accumulates at the bottom of the tank.

[0005] In this regard, with conventional hydraulic oil tanks, including the hydraulic oil tank device described in Patent Document 1, it was difficult to pinpoint and remove only the water and foreign matter that had accumulated on the bottom of the tank where the hydraulic oil was stored. Therefore, when changing the hydraulic oil, the water and foreign matter had to be removed by crawling under the aircraft and cleaning the inside of the tank through a maintenance opening on the bottom of the tank.

[0006] However, because hydraulic oil stored in hydraulic oil tanks is not frequently replaced, water and foreign matter continue to accumulate at the bottom of the tank until the hydraulic oil is replaced. The water and foreign matter that accumulates at the bottom of the tank then floats and mixes with the hydraulic oil while the machine is in operation. As a result, the water and foreign matter may pass through the suction filter along with the hydraulic oil and enter the hydraulic circuit. If water or foreign matter enters the hydraulic circuit, it may have a negative effect on the hydraulic equipment.

[0007] Therefore, an object of the present invention is to provide a hydraulic oil tank structure that can prevent water or foreign matter that has entered the hydraulic oil tank from entering the hydraulic circuit along with the hydraulic oil. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the present invention provides a hydraulic oil tank structure comprising: a tank body including a tank bottom surface having an opening formed therein and storing hydraulic oil; and a suction oil passage section provided on the tank bottom surface, wherein the suction oil passage section has a suction filter for filtering the hydraulic oil; and a water receiver provided integrally with the suction filter below the suction filter, wherein the water receiver includes a container bottom surface and a container side surface having an intake port formed thereon, the container bottom surface is positioned below the tank bottom surface, and the water receiver is configured as a deposition chamber for water and foreign matter.

[0009] Here, the tank body includes a tank top surface, and a maintenance opening is formed on the tank top surface through which the suction filter and the water receiver can be inserted and removed, and it is preferable that the suction filter and the water receiver are provided with a removal rod for removing them from the tank body through the maintenance opening.

[0010] It is also preferable that the suction filter and the water receiver are connected via the lower end of the removal rod.

[0011] Furthermore, it is preferable that the suction filter and the water receiver are separable. [Effects of the Invention]

[0012] According to the present invention, a water receiver for collecting water and foreign matter is provided below the suction filter and integrally with the suction filter. The bottom of the water receiver is located below the tank bottom, and the water receiver serves as a chamber for accumulating water and foreign matter. This allows water and foreign matter that have entered the hydraulic oil tank to be guided into the water receiver, allowing them to accumulate there. As a result, the water receiver can be periodically removed from the tank body, allowing water and foreign matter that have accumulated in the water receiver to be removed relatively frequently from above the tank. This prevents water and foreign matter that have entered the hydraulic oil tank from entering the hydraulic circuit along with the hydraulic oil. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a vertical cross-sectional view of a hydraulic oil tank according to an embodiment of the present invention; [Figure 2] FIG. 4 is an enlarged view of a suction oil passage portion provided in the tank bottom plate. [Figure 3] FIG. 1 is an enlarged cross-sectional view of a suction filter. [Figure 4] FIG. 4 is an enlarged cross-sectional view of the cylindrical tube and the water receiver. [Figure 5] A close-up of the removal rod. DETAILED DESCRIPTION OF THE INVENTION

[0014] <1. Embodiment> The structure of a hydraulic oil tank according to an embodiment of the present invention will be described with reference to Figures 1 to 5. In the following, a hydraulic oil tank 10 (see Figure 1) mounted on a work machine such as a hydraulic excavator will be illustrated as an example of a hydraulic oil tank.

[0015] As shown in FIG. 1, the hydraulic oil tank 10 comprises a tank body 1, a suction oil passage portion 2, a take-out rod 21, a suction pipe 3, an inlet pipe 7, a return filter 8, and the like.

[0016] The tank body 1 is for storing hydraulic oil HF to be supplied to the hydraulic circuit of a hydraulic excavator (work machine). Specifically, the tank body 1 is composed of a tank bottom surface 11, tank side surfaces 13 extending upward from the tank bottom surface 11, and a tank top surface 15 provided on the upper end side of the tank side surfaces 13 so as to face the tank bottom surface 11.

[0017] The area surrounded by the tank bottom surface 11, the tank side surface 13, and the tank top surface 15 functions as a storage space SP for storing the hydraulic oil HF.

[0018] An opening 11H communicating with the suction pipe 3 is formed in the tank bottom surface 11. The suction pipe 3 is installed below the tank bottom surface 11 so as to communicate with the opening 11H of the tank bottom surface 11. As the hydraulic pump is driven, the hydraulic oil HF that has passed through the suction oil passage portion 2 flows into the suction pipe 3.

[0019] As shown in FIG. 2, the suction pipe 3 is configured to include a spacer 31, a support plate 32, a vertical plate 33, and an elbow .

[0020] The spacer 31 is welded to the tank bottom surface 11 below the tank bottom surface 11. The support plate 32 is fixed to the spacer 31 below the spacer 31 with bolts. The vertical plate 33 is welded to the support plate 32 below the support plate 32. The elbow 34 is an L-shaped pipe and is fixed to the vertical plate 33.

[0021] Referring again to Figure 1, as shown in Figure 1, an inlet pipe 7 penetrates the tank side surface 13. Return oil flows into the inlet pipe 7 from each hydraulic actuator mounted on the hydraulic excavator.

[0022] The return oil that has flowed into the inlet pipe 7 flows into an area AR formed within the tank body 1. A return filter 8 is installed in the area AR to filter the return oil from each hydraulic actuator. The return oil from each hydraulic actuator is filtered by the return filter 8 before returning to the storage space SP of the tank body 1.

[0023] A maintenance opening 15H is formed in the tank top surface 15. When the machine is in operation, a cover member 151 is attached to the maintenance opening 15H.

[0024] The recessed portion on the upper end of the vertically long removal rod 21 is inserted into and supported by the lower protrusion of the cover member 151. The removal rod 21 will be described in detail later.

[0025] The suction oil passage section 2 is installed on the tank bottom surface 11 so as to close the opening 11H (see FIG. 1). As shown in FIG. 2, the suction oil passage section 2 is configured to include a suction filter 4, a cylindrical pipe 5 arranged inside the suction filter 4, and a water receiver 6 provided below the suction filter 4.

[0026] As shown in FIG. 3, the suction filter 4 is configured to include a filter section 40 for filtering the hydraulic oil HF, a circulation pipe 41 arranged inside the filter section 40, and a gasket 43 provided below the filter section 40.

[0027] A plurality of openings 41H are formed on the outer peripheral surface of the circulation pipe 41. The plurality of openings 41H are through holes for allowing the hydraulic oil HF filtered by the filter unit 40 to pass inside the circulation pipe 41.

[0028] 2 and 3, for ease of viewing, the opening 41H is shown only on a part of the outer circumferential surface of the flow pipe 41, but in reality, the opening 41H is formed on the entire surface.

[0029] Furthermore, an insertion hole 4H is formed in the center of the top of the suction filter 4, through which the lower end of the removal rod 21 can be inserted. On the other hand, the lower end side of the suction filter 4 is opened widely so that the cylindrical tube 5 can be inserted and removed.

[0030] The diameter D1 of the suction filter 4 is smaller than the maintenance opening 15H (see FIG. 1) in the tank top surface 15. This allows the suction filter 4 to be removed from the tank body 1 to the outside through the maintenance opening 15H.

[0031] 4, the cylindrical tube 5 is made of a cylindrical member that is long in the vertical direction. The diameter D2 of the cylindrical tube 5 is smaller than the diameter of the flow pipe 41 that constitutes a part of the suction filter 4. Therefore, the cylindrical tube 5 can be placed inside the flow pipe 41.

[0032] A plurality of openings 51H are formed in an area of ​​the outer circumferential surface of the cylindrical tube 5 that is higher than the water receiver 6. The plurality of openings 51H are through holes that allow the hydraulic oil HF that has flowed in through the flow pipe 41 of the suction filter 4 to pass further inside the cylindrical tube 5.

[0033] 2 and 4, for ease of viewing, the opening 51H is shown only on a part of the outer circumferential surface of the cylindrical tube 5, but in reality, the opening 51H is formed on the entire surface.

[0034] On the other hand, the area of ​​the outer circumferential surface of cylindrical tube 5 that is lower than water receiver 6 functions as part of the side surface of water receiver 6. Therefore, the area of ​​the outer circumferential surface of cylindrical tube 5 that is lower than water receiver 6 does not have multiple openings 51H formed therein.

[0035] Furthermore, a female screw FS is formed in the center of the top of the cylindrical tube 5, which can be threaded onto a male screw MS (see FIG. 5) formed on the lower end of the extraction rod 21.

[0036] As shown in FIG. 4, the water receiver 6 is provided so as to surround a part of the outer circumferential surface of the cylindrical tube 5 on the lower end side, and functions as a deposition chamber in which water and foreign matter are deposited.

[0037] The water receiver 6 is composed of a container bottom surface 61, a container side surface 62, and a filter support portion 63. As described above, a portion of the outer circumferential surface of the cylindrical tube 5 on the lower end side also functions as the inner surface of the water receiver 6.

[0038] The container bottom surface 61 extends substantially horizontally outward from the lower end of the cylindrical pipe 5. The end of the container bottom surface 61 on the cylindrical pipe 5 side is welded to the outer circumferential surface of the cylindrical pipe 5.

[0039] As shown in FIG. 2, in a state where the suction oil passage portion 2 is installed, the container bottom surface 61 is located at a position lower than the tank bottom surface 11.

[0040] 4, a plurality of intake ports 62H are formed on the upper end side of container side 62 for taking in water and foreign matter into water receiver 6. The plurality of intake ports 62H are arranged at intervals around container side 62.

[0041] As shown in FIG. 2, in a state where the suction oil passage portion 2 is installed, the plurality of intake ports 62H are all disposed near the bottom surface 11 of the tank.

[0042] As shown in FIG. 4, the filter support portion 63 is configured as a member with an L-shaped cross section that bends and extends outward from the upper end of the container side surface 62, and then bends and extends upward.

[0043] The suction filter 4 is placed on the horizontal surface of the filter support portion 63 so that the packing 43 (see FIG. 3) is in close contact with the horizontal surface of the filter support portion 63. With this configuration, the water receiver 6 is provided integrally with the suction filter 4 below the suction filter 4.

[0044] As shown in FIG. 5, the lower end of the removal rod 21 is formed with a male thread MS that can be threaded into a female thread FS (see FIG. 4) formed in the center of the upper part of the cylindrical tube 5.

[0045] As shown in Figure 2, the male thread MS (see Figure 5) formed on the lower end of the removal rod 21 is inserted into the insertion hole 4H (see Figure 3) of the suction filter 4 and is threadedly engaged with the female thread FS (see Figure 4) of the cylindrical tube 5. This connects the suction filter 4 and the cylindrical tube 5 together via the removal rod 21. Note that, because the cylindrical tube 5 and the water receiver 6 are configured as a single member, it can also be said that the suction filter 4 and the water receiver 6 are connected together by the removal rod 21.

[0046] In a state in which the suction filter 4 and the water receiver 6 are connected by the removal rod 21, the water receiver 6 is provided integrally with the suction filter 4 below the suction filter 4.

[0047] Furthermore, the connection between the suction filter 4 (FIG. 3), the cylindrical tube 5, and the water receiver 6 (FIG. 4) is released by removing (releasing) the male thread MS of the removal rod 21 that is threaded into the female thread FS of the cylindrical tube 5. In this manner, in this embodiment, the suction filter 4 and the water receiver 6 are configured to be separable.

[0048] According to the embodiment described above, the water receiver 6 for collecting water and foreign matter is provided integrally with the suction filter 4 below the suction filter 4. In addition, the container bottom surface 61 of the water receiver 6 is located below the tank bottom surface 11.

[0049] This allows water and foreign matter that has entered the hydraulic oil tank 10 to be guided into the water receiver 6, where it can be collected. As a result, it becomes possible to periodically remove the water receiver 6 from the tank body 1 and relatively frequently remove the water and foreign matter that has accumulated in the water receiver 6 from the top of the tank. This makes it possible to prevent water and foreign matter that has entered the hydraulic oil tank 10 from entering the hydraulic circuit along with the hydraulic oil HF.

[0050] In particular, in the above-described embodiment, the container bottom surface 61 of the water receiver 6 is positioned lower than the tank bottom surface 11, making it easier for water and foreign objects to enter but more difficult for them to exit, thereby preventing water and foreign objects from floating away due to the shaking of the machine.

[0051] Furthermore, according to the above-described embodiment, since the water receiver 6 is disposed in the suction oil passage section 2, water and foreign matter are likely to collect in the water receiver 6 along with the flow of the hydraulic oil HF when the hydraulic pump is driven, and the efficiency of capturing water and foreign matter is better than when the water receiver 6 is disposed in another location.

[0052] Furthermore, according to the above-described embodiment, the water receiver 6 can be removed from the tank body 1 via the removal rod 21, so water and foreign matter can be removed without discharging the hydraulic oil HF. Therefore, there is no need to prepare an oil drain container to store the hydraulic oil HF drained from the tank body 1.

[0053] In particular, in the above-described embodiment, the water receiver 6 can be removed from the maintenance opening 15H formed in the tank top surface 15, thereby avoiding the need to drain oil below the hydraulic oil tank 10 and eliminating the need for the operator to crawl under the machine.

[0054] Furthermore, the water receiver 6 can be removed from the tank body 1 by utilizing the maintenance opening 15H for removing the suction filter 4.

[0055] Furthermore, according to the above-described embodiment, the suction filter 4 and the water receiver 6 are configured to be disassembled, so that water and foreign matter accumulated in the water receiver 6 can be easily discharged, making it easy to clean the inside of the water receiver 6.

[0056] Furthermore, according to the above-described embodiment, the cylindrical tube 5 is arranged inside the suction filter 4, so the opening on the lower side of the suction filter 4 is larger than that of conventional filters. This makes it easier to clean the inside of the suction filter 4.

[0057] Furthermore, according to the embodiment described above, the suction filter 4 and the water receiver 6 are connected by the removal rod 21, so there is no need to provide a separate part for connecting the two. This reduces the number of parts and improves ease of handling.

[0058] <2. Modifications> The structure of the hydraulic oil tank according to the present invention is not limited to the above-described embodiment, and various modifications and improvements are possible within the scope of the claims.

[0059] For example, in the above-described embodiment, the cylindrical pipe 5 is disposed inside the suction filter 4, but this is not limiting. If the water receiver 6 is disposed below the suction filter 4, the cylindrical pipe 5 does not necessarily have to be provided. [Industrial Applicability]

[0060] As described above, the hydraulic oil tank structure according to the present invention is suitable for use as a hydraulic oil tank mounted on a work machine such as a hydraulic excavator. [Explanation of symbols]

[0061] 1 Tank body 2 Suction oil passage 3 Suction pipe 4. Suction filter 4H insertion hole 5 Cylindrical tube 6 Water receiver 7 Inflow pipe 8 Return Filter 10 Hydraulic oil tank 11 Tank bottom 11H opening 13 Tank side 15 Tank top 15H Maintenance Opening 21 Removal rod 31 Spacer 32 Support plate 33 Vertical board 34 Elbow 40 Filter section 41 Flow pipe 41H opening 43 Gasket 51H opening 61 Bottom of container 62 Container side 62H intake port 63 Filter support part 151 Cover member FS female thread HF hydraulic oil MS male thread SP Storage Space

Claims

1. A hydraulic oil tank structure, a tank body including a tank bottom surface having an opening formed therein and configured to store hydraulic oil; a suction oil passage portion provided on the bottom surface of the tank; Equipped with The suction oil passage portion is a suction filter that filters the hydraulic oil; a water receiver provided integrally with the suction filter below the suction filter, The water receiver includes a bottom surface and a side surface having an inlet formed therein; the container bottom surface is located below the tank bottom surface, A hydraulic oil tank structure characterized in that the water receiver is configured as a chamber for accumulating water and foreign matter.

2. The tank body includes a tank upper surface, A maintenance opening through which the suction filter and the water receiver can be inserted and removed is formed on the top surface of the tank, 2. The hydraulic oil tank structure according to claim 1, wherein the suction filter and the water receiver are provided with a removal rod for removing them to the outside of the tank body through the maintenance opening.

3. 3. The hydraulic oil tank structure according to claim 2, wherein the suction filter and the water receiver are connected via a lower end of the extraction rod.

4. 4. The hydraulic oil tank structure according to claim 1, wherein the suction filter and the water receiver are separable.

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