JP3780828B2 - Hydraulic oil tank - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic oil tank provided in a hydraulic construction machine such as a hydraulic excavator.
[0002]
[Prior art]
The hydraulic oil tank is a device that forms part of a hydraulic circuit including a hydraulic pump and a hydraulic actuator. The hydraulic oil is first sucked into the hydraulic pump from the hydraulic oil tank and pressurized. The oil discharged from the hydraulic pump is supplied to a hydraulic actuator such as a hydraulic cylinder or a hydraulic motor via a direction switching valve. The return oil from the hydraulic actuator flows back into the hydraulic oil tank through a device such as an oil cooler. As described above, since the hydraulic oil circulates in the closed loop, a contaminated material may be mixed during the circulation of the hydraulic oil. A typical example of this fouling material is metal wear powder, and seal fragments and the like also become fouling material for hydraulic oil. If such a pollutant circulates, there is a risk of damaging equipment such as a hydraulic pump, a hydraulic motor, a hydraulic cylinder, etc., and oil leakage may occur in each part.
[0003]
In consideration of the above points, the hydraulic oil tank is provided with an oil filter composed of a full flow filter, and foreign substances such as metal wear powder and seal debris are removed by this oil filter. FIG. 5 shows the configuration of a conventional hydraulic oil tank.
[0004]
In the figure, reference numeral 1 denotes a tank body. The tank body 1 is a sealed container composed of a bottom surface portion 1a, four side surfaces 1b and a top plate portion 1c. A partition wall 2 is provided inside the tank body 1 thus sealed, and the partition wall 2 is divided into an inflow chamber 3 and an outflow chamber 4. The partition wall 2 is provided with a flow port 5 through which hydraulic oil flows between the inflow chamber 3 and the outflow chamber 4. Here, the tank body 1 is divided into two chambers so that when the return oil contains bubbles, the hydraulic oil stays in the inflow chamber 3 for a predetermined time to separate the air. Further, this is to prevent the liquid level on the outflow chamber 4 side from fluctuating greatly.
[0005]
In the tank body 1, a plurality of oil filters 10 are installed on the inflow chamber 3 side. The oil filter 10 has a filter case 11 formed of a bottomed cylindrical container, and a filter element 12 formed of an annular member is provided inside the filter case 11. Is provided with an outflow pipe 13 facing it. The outflow pipe 13 is fixed to the bottom plate 11a of the filter case 11 and extends downward. Although not shown, the filter case 11 is connected to an inflow pipe into which return oil from a hydraulic actuator or the like flows. Therefore, foreign matters such as metal wear powder and seal debris are removed from the return oil flowing into the filter case 11 outside the filter case 11 from the inflow pipe, while passing through the filter element 12. Flow into. Thus, the hydraulic oil that has flowed into the filter element 12 and from which foreign matter has been removed is guided into the inflow chamber 3 by the outflow pipe 13, and is further partitioned by the partition wall 2 through the flow port 5. 4 will flow in.
[0006]
As is clear from FIG. 6, the filter element 12 is provided with a relief valve 14 at an upper position thereof. The relief valve 14 is configured to open and close a through hole (not shown) provided on the upper surface of the annular filter element 12 and to bias the valve member 15 in a direction to close the through hole. The spring 16 is provided. The spring 16 is normally applied with a biasing force in the direction of closing the through hole. However, when a differential pressure is generated inside and outside the filter element 12, that is, the outside of the filter element 12 is more springy than the inside of the filter element 12. When the pressure becomes higher than the pressure set in (4), the relief valve 14 opens, and the hydraulic oil flows into the filter element 12 without passing through the filter element 12.
[0007]
The filter element 12 provided inside the filter case 11 in the oil filter 10 can be replaced. For this purpose, the top plate portion 1c is provided with a filter outlet 6, and a cover 7 is detachably attached to the outlet 6. A frame member 8 is fixed around the outlet 6 and the upper end of the filter case 11 is fixed to the frame member 8 by welding means. Accordingly, the oil filter 10 is suspended from the top plate portion 1c of the tank body 1, and a spring 9 is elastically mounted between the filter element 12 provided in the filter case 11 and the cover 7. The filter element 12 is positioned by the spring 9 and the filter element 12 is brought into pressure contact with a rubber (not shown) provided on the bottom plate 11a of the filter case 11 so as to keep the space liquid-tight. In FIG. 5, 17 is a suction pipe connected to the hydraulic pump, and 18 is a suction filter.
[0008]
[Problems to be solved by the invention]
By the way, when a hydraulic cylinder is used as a hydraulic actuator, the amount of hydraulic oil in the cylinder varies greatly depending on its operating state, that is, depending on whether the rod is in an extended state or a reduced state. In a hydraulic operating machine such as a large hydraulic excavator, one having a large number and volume of hydraulic cylinders is used. In such a machine, for example, if all the hydraulic cylinders are operated in the direction of contraction simultaneously, a large amount of hydraulic oil may temporarily flow into the hydraulic oil tank. Therefore, a large oil filter provided in the hydraulic oil tank must be used, but in order to share the oil filter, it is common to install a plurality of standard size oil filters. Here, the oil filter is an independent device including a filter case, a filter element, and the like. When a plurality of oil filters are installed, each filter case must be welded, and the number of manufacturing steps increases accordingly. In addition, when the number of oil filters to be mounted is increased, there is a problem that the hydraulic oil tank becomes heavier.
[0009]
The present invention has been made in view of the above points, and an object of the present invention is to easily assemble the hydraulic oil tank when the hydraulic oil tank is attached to the hydraulic oil tank. It is to be able to suppress the conversion.
[0010]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention comprises a bottom face part, a side face part, and a top plate part having a plurality of filter element insertion holes in a hydraulic oil tank provided with a filter for removing foreign matter in the hydraulic oil. A tank body, a partition wall provided in the tank body, partitioning the inside of the tank body into an inflow chamber and an outflow chamber, a notch portion provided in one corner portion on the inflow chamber side in the tank body, A base plate provided in the notch and partitioning the inflow chamber into a filter mounting region and a storage region, a standing wall plate provided so as to close the notch, and the standing wall plate provided with the filter mounting A plurality of pipe connection portions that communicate with the area, a plurality of outlet pipes that are provided in the base plate and communicate with the filter mounting area and the storage area, and correspond to each of the outlet pipes. A plurality of filter elements detachably provided in the filter mounting region, a flow port provided in the partition wall and communicating with the storage region and the outflow chamber, and the tank body so as to communicate with the outflow chamber In the first invention, the inflow chamber is partitioned by the base plate into an upper filter mounting region and a lower storage region, and the standing wall plate is L-shaped. It is formed in a shape and is provided on the base plate so as to close the notch. In the second aspect of the invention, the base plate is provided on the lower side of the notch so as to partially cover the inflow chamber, the standing wall plate is formed in a U-shape, and is provided on the base plate. a chamber with partitions and forms the filter mounting region and the storage region, and is characterized in that it has a configuration for closing the cutout portion.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, FIG. 1 shows the entire configuration of the hydraulic oil tank, FIG. 2 shows an enlarged main portion thereof, and FIG. 3 shows an exploded main portion of the tank body. The hydraulic oil tank has a tank body 20, which is composed of a bottom surface portion 20 a, a side surface portion 20 b, and a top plate portion 20 c, and an inflow chamber into which return oil from the hydraulic actuator flows by a partition wall 21. 22 and an outflow chamber 23 through which hydraulic oil from which contaminants have been removed flows out toward the hydraulic pump. A flow port 24 is opened in the partition wall 21. Further, a suction pipe 25 for operating oil in the hydraulic pump is connected to a position on the outflow chamber 23 side of the bottom surface portion 20 a of the tank body 20, and a suction filter 26 is provided in the suction pipe 25.
[0012]
The inflow chamber 22 is not a single chamber, but has a structure in which a base plate 30 is provided and the region is divided into two vertically. The upper region is a filter mounting region 31, and the lower region is a storage region 32 in which hydraulic oil from which polluted substances have been separated and removed is stored. Accordingly, the oil filter 40 is mounted in the filter mounting area 31. A plurality of, for example, two to four, oil filters 40 are provided in the filter mounting region 31. Here, the oil filter 40 provided in the filter mounting region 31 does not have a filter case. Therefore, the oil filter 40 has a filter element 42 provided with a relief valve 41 on the inner side at the upper end, and the inside of the through-hole 33 formed in the base plate 30 is for outflow leading to the internal space of the filter element 42. A pipe 43 is fixedly provided by means such as welding, and the outflow pipe 43 functions as an outflow portion for flowing hydraulic oil from the inside of the filter element 42 to the storage region 32.
[0013]
A cover 27 is detachably provided on the top plate portion 20c of the tank main body 20 at an upper position of each filter mounting portion, that is, a position where the through hole 33 is formed in the base plate 30. The filter element 42 is attached to the base plate 30 by a spring 44 provided between the inner surface of the cover 27 and is pressed into a predetermined position so as to be pressed by a rubber 45 disposed so as to surround the outflow pipe 43. It is fixed in a positioned state and sealed. Therefore, the oil filter 40 is attached to the tank body 20 so as to surround the outflow pipe 42 in which the oil filter 40 is fixed to the base plate 30, and the spring 44 is attached to the upper part of the filter element 42 and then the cover is covered. 27 is fixed to the frame member 46 with bolts 47. Accordingly, it is not necessary to weld the filter case to the tank body as in the prior art described above, and the number of steps for assembling the oil filter can be reduced by that amount, and a plurality of oil filters 40 can be easily mounted. Further, when the cover 27 is removed and the spring 44 is taken out, the filter element 42 becomes free. Therefore, the filter element 42 can be taken out and a new filter element can be easily attached.
[0014]
Here, the oil filter 40 is not provided with a filter case, but the inflow chamber 22 is divided into a filter mounting region 31 and a storage region 32 by the partition wall 21 and the base plate 30, and therefore these are provided in the tank body 20. It functions as a filter case for all the oil filters 40. That is, the partition wall 21 exhibits a function as a filter case of the oil filter 40 in addition to the original function of partitioning the inside of the hydraulic oil tank into two chambers. As a result, the configuration of the oil filter 40 is simplified and the weight is reduced.
[0015]
As described above, when the base plate 30 is assembled in the inflow chamber 22 of the tank body 20, as shown in FIG. 3, the side surface 20b of the tank body 20 has a predetermined size at one corner. A notch C is provided, and the base plate 30 has an overhanging portion 30a that is placed on an end surface formed by providing the notch C and slightly protrudes outward from the end surface. Is formed. Further, a standing wall plate 28 made of a plate body bent in an L shape is attached to a portion of the cutout C of the tank body 30. Accordingly, the base plate 30 is installed at the position of the notch C and the periphery thereof is welded to be fixed to the tank body 20. Thereafter, the standing wall plate 28 is placed on the base plate 30 and welded to the standing wall plate 28, the base plate 30, and the side surface portion 20b. In this way, the four-side surface portion 20b incorporating the base plate 30 is formed, and the tank body 20 is formed by fixing the top plate portion 20c to the upper portion thereof by welding means. And the piping connection part 29 for recirculating the return oil in a hydraulic oil tank can be attached to the standing wall board 28. FIG.
[0016]
The inflow chamber is divided into two upper and lower chambers by the base plate in the filter mounting area and the storage area. However, if the number of oil filters installed, the maximum flow rate of return oil, etc. are taken into account, the inflow chamber is not necessarily inflow. The entire upper region of the chamber need not be the filter mounting region. For this purpose, for example, as shown in FIG. 4, the notch C ′ in the tank body 120 is provided in the same shape as in FIG. 3, and the base plate 130 has a limited size including the portion where the oil filter is mounted and its vicinity. Satoshi, the standing wall portion 128 installed at the position of the notch C ′ is formed in a U shape. Thereby, the space of the filter mounting area can be limited to a desired area.
[0017]
【The invention's effect】
Since this invention was comprised as mentioned above, when mounting | wearing a hydraulic oil tank with a some oil filter, the assembly | attachment is easy and there exists an effect of being able to suppress that a hydraulic oil tank becomes weighty.
[Brief description of the drawings]
FIG. 1 is a sectional view of a hydraulic oil tank showing an embodiment of the present invention.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is an exploded perspective view of a mounting portion of a base plate.
FIG. 4 is an exploded perspective view of a base plate mounting portion according to another embodiment of the present invention.
FIG. 5 is a cross-sectional view of a hydraulic oil tank according to the prior art.
6 is an enlarged view of a main part of FIG.
[Explanation of symbols]
20, 12 Tank body 20a Bottom surface portion 20b Side surface portion 20c Top plate portion 21 Bulkhead 22 Inflow chamber 23 Outflow chamber 24 Flow port 27 Cover 28, 128 Standing wall portion 30, 130 Base plate 31 Filter mounting region 32 Storage region 40 Oil filter 41 Relief valve 42 Filter element 43 Outflow piping 44 Spring

Claims (2)

A hydraulic oil tank having a filter for removing foreign matter in hydraulic oil, a tank main body comprising a bottom surface portion, a side surface portion, and a top plate portion having a plurality of filter element insertion holes, and provided in the tank main body, A partition that partitions the inside of the main body into an inflow chamber and an outflow chamber; a notch provided in one corner portion on the inflow chamber side in the tank body; and a lower side of the notch A base plate that partitions the chamber into an upper filter mounting region and a lower storage region, an L-shaped standing wall plate provided on the base plate so as to close the notch, and the standing wall plate provided a pipe connecting section leading to the filter mounting area, more is provided in the base plate, and a plurality of outlet pipes for communicating the said filter mounting region and the reservoir region, the A plurality of filter elements provided detachably to correspond to the outflow pipe in the filter mounting region provided in the partition wall, a communication port for communicating the outlet chamber and the reservoir region, before Symbol outflow chamber And a suction pipe provided in the tank body so as to communicate with the tank. A hydraulic oil tank having a filter for removing foreign matter in hydraulic oil, a tank main body comprising a bottom surface portion, a side surface portion, and a top plate portion having a plurality of filter element insertion holes, and provided in the tank main body, A partition that partitions the inside of the main body into an inflow chamber and an outflow chamber, a notch provided in one corner portion on the inflow chamber side in the tank body, and a lower side of the notch, A base plate provided so as to partially cover, a U-shaped standing wall plate provided on the base plate, partitioning the inflow chamber into a filter mounting region and a storage region, and closing the notch, A plurality of outlet pipes provided on the standing wall plate and connected to the filter mounting area, and a plurality of outlet pipes provided on the base plate and communicating the filter mounting area and the storage area. A plurality of filter elements detachably provided in the filter mounting region so as to correspond to the respective outflow pipes, a flow port provided in the partition wall and communicating the storage region and the outflow chamber, A hydraulic oil tank comprising a suction pipe provided in the tank body so as to communicate with an outflow chamber.

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