JP2005188673A - Filtration structure of liquid storage container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To catch fine foreign matters in liquid in a liquid storage container without recirculation. <P>SOLUTION: An upper part or a sidewall 12b of the liquid storage container 12 is provided with an inflow port 11 and an outflow port 14 of liquid, and a filtration member 15 formed of a perforated body is placed on a bottom wall 12a while abutting on the sidewall 12b. When the liquid is poured into the liquid storage container 12, the foreign matters such as metal powder and adhesive residue in the liquid are caught by entering the filtration member formed of a nonwoven fabric of three-dimensional structure. Once caught, the foreign matters cling to the nonwoven fabric and is not carried away again with the liquid in the liquid storage container 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a filtration structure for a liquid storage container in which a filtration member is placed in a container for storing a liquid such as oil or water, particularly a container for storing lubricating oil of an internal combustion engine.

As a filtering structure of this type of liquid storage container, for example, the structure shown in FIG. 4 has been devised (see Patent Document 1).
The filtration structure of the liquid storage container includes an oil pan 2 installed in a lower part of an internal combustion engine for a vehicle, the oil pan 2 serving as a casing, and a flange portion 3 and a flange portion 3 formed in accordance with the inner wall shape thereof. There is provided an element part 4 integrally formed in a plurality of corrugated bag shapes covering the entire inner surface, and an oil pumping pipe 6 extending through the insertion hole 5 formed in the element part 4 to the vicinity of the inner bottom surface of the oil pan 2 is provided. Is provided.

  As a result, the dirty oil is filtered by passing from the upper surface side to the lower surface side of the element portion 4, and foreign matters such as metal powder and adhesive residue are removed and pumped up from the oil pumping pipe 6 and circulated in the internal combustion engine. After that, the oil pan 2 is returned again, and is pumped up again by the oil pumping pipe 5 to be recirculated.

In contrast to this, a permanent magnet is arranged on the bottom wall of the container, and the oil circulating in the internal combustion engine is attracted by the permanent magnet in the middle of the circulation, adhered to the metal powder, and recirculated to capture the metal powder from the oil. There is something like that (see Patent Document 2).
Japanese Patent Application Laid-Open No. 11-093633 Japanese Utility Model Publication No. 05-070613

  In the above-described filtration structure of the liquid storage container, the filtration area is formed by a flange portion formed in accordance with the inner wall shape of the oil pan and an element portion integrally formed in a plurality of corrugated bag shapes covering the entire inner surface of the flange portion. However, foreign matter such as metal powder that has not been captured by the element can stay in the oil between the lower part of the element and the bottom of the oil pan. May circulate in the internal combustion engine.

On the other hand, in the case where a permanent magnet is arranged at the bottom of the storage container, metal powder including small particles such as iron powder that can be adsorbed to the permanent magnet can be attracted and adhered, but aluminum and stainless steel that cannot be adsorbed by the permanent magnet In addition, metal powder such as copper or foreign matter such as adhesive residue is recirculated in the internal combustion engine without being adsorbed.

  The filtration structure of the liquid storage container according to the present invention forms a liquid storage container with the side wall and the bottom wall of the casing, and is provided with a liquid inlet and outlet at the upper part or side wall of the casing. The filter member made of a porous body is placed on the bottom wall while being in contact with the side wall.

As the filtering member, for example, a non-woven fabric such as polyester or polypropylene made of synthetic fiber or a porous body such as foam metal cermet can be used. By placing such a filter member in contact with the side wall and placing it on the bottom wall, foreign matter such as non-ferrous metal, metal powder, and adhesive residue is captured in the three-dimensional structure in the filter member. Since it stays entangled in the three-dimensional structure, it does not leave the filter member again.

  As apparent from the above description, in the liquid storage container filtration structure according to the present invention, the filtration member is placed in contact with the side wall of the storage container and placed on the bottom wall, so that the foreign matter in the liquid stored in the storage container Is trapped in the three-dimensional structure of the filter member, and is not separated from the filter member and taken away into the liquid.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  In the embodiment shown in FIGS. 1 to 3, the present invention is applied to an oil pan of an automatic transmission device using a vehicle torque converter, and only its main part is shown. As shown in FIG. 2, this automatic transmission is provided with a hydraulic oil inlet 11 and a valve chamber B in which various valves are housed on the lower side of the transmission gear casing A. An oil pan 12 that stores hydraulic oil is provided, and the hydraulic oil is sucked up by a pump P to adjust the blade gap of the torque converter T and to operate a valve. A strainer 13 is provided to constantly filter the circulating hydraulic oil.

  The oil strainer 13 has, on the other end side, a lid-like upper body 13b provided with an upward outlet pipe 13a fitted to the oil feed passage 14 (outlet) of the valve chamber B on one side. A dish-shaped lower body 13d provided with a downward inlet pipe 13c is formed, and is formed of iron or stainless steel, and a filter body 13e made of a plate-shaped wire net having a mesh between 100 and 300 mesh between the bodies 13b and 13d. Alternatively, a retainer 13f made of an iron plate or a stainless steel plate is disposed so as to overlap with the folded filter paper, and the peripheral edge thereof is caulked to the lower body 13d by the peripheral collar of the upper body 13b.

  Such an oil strainer 13 has an O-ring 16 interposed in the pipe portion of the outlet pipe 13 a and is fitted in the oil feeding passage 14 of the valve chamber B, and the tip of the inlet pipe 13 c faces the inner wall of the oil pan 12. The oil strainer 13 is attached to the valve chamber B so as to do this.

Further, a slight gap is obtained between the bottom wall 12a of the oil pan 12 and the tip of the inlet pipe 13c of the oil strainer 13, and the porous body is disposed in accordance with the shape of the side wall 12b of the oil pan 12. A member 15 is placed. As the porous filter member 15, for example, a nonwoven fabric that is a single-layer structure material in which ultrafine single fibers such as polyester and polyethylene are entangled three-dimensionally can be used. The thickness of this non-woven fabric can be, for example, about 2 to 10 mm, depending on the size of the gap between the bottom wall of the oil pan 12 (liquid storage container) on which the filtration member 15 is placed and the inlet pipe 13c. Foreign matter that can be adjusted as appropriate and can be mixed in the hydraulic oil (liquid) stored in the oil pan 12, for example, metal powder resulting from wear of functional parts such as rotating and sliding parts, and exfoliated adhesive residue Depending on the amount and particle size, the thickness of the filtration member can be increased, the fiber diameter can be increased or decreased, or the nonwoven fabric can be made into a multilayer of two or more layers. Moreover, it is also possible to use foam metal, such as cermet which made the metal foam instead of said nonwoven fabric.

In the filtration structure of the liquid storage device of the embodiment configured as described above, the hydraulic oil inlet 11 is provided in the upper part of the oil pan 12 (liquid storage device), and the hydraulic oil is oiled in the oil pan 12. Filled to an appropriate liquid level higher than the inlet pipe 13c of the strainer 13, and is sucked up by the pump P in the casing and hydraulic oil is sucked up from the inlet pipe 13c in advance when adjusting the blade interval of the torque converter T and operating the valve. A foreign substance having a certain size (particle size) or more out of the metal powder in the hydraulic oil is captured by the filter 13e of the oil strainer, circulates in the torque converter T, and then returns to the oil pan 12. The hydraulic oil that has returned to the oil pan 12 is poured from the upper part of the filter member 15 placed on the bottom wall 12a of the oil pan. Therefore, the hydraulic oil is mixed in the hydraulic oil and is filtered by the filter 13e of the oil strainer 13. The foreign matter having a small particle size that could not be trapped enters the filter member 15 from the top of the filter member 15 toward the bottom wall of the oil pan 12, and is embedded in the nonwoven fabric entangled three-dimensionally and trapped by the fibers. And accumulated. The foreign material once embedded in the non-woven fabric is returned from the inlet 11 at the top of the oil pan 12 because the filtering member 15 contacts the side wall 12b of the oil pan 12 and is placed on the bottom wall 12a. Is poured only from the upper surface without flowing in the thickness direction of the filtering member 15, and the foreign matter captured in the filtering member 15 is not taken away again.

As described above, in order to capture the foreign matter of the hydraulic oil in the oil pan 12, the coarseness of the filter member 15 is preferably finer than the filter body 13 e of the oil strainer 13.

FIG. 3 shows a modification of the above embodiment. Since the filter member 15a placed on the oil pan 12 is in contact with the side wall 12b of the oil pan 12, even if the vehicle moves, the oil pan Although it is unthinkable to move forward and backward and left and right in the interior of the vehicle 12, when the vehicle gets over a level difference or the like, the vehicle moves in the vertical direction, and the filter member 15 blocks the inlet pipe 13c tip of the oil strainer 13. There is a possibility that the suction of the hydraulic oil from the pipe 13c may be hindered.

Therefore, an opening 15b having an inner diameter that is slightly larger than the outer diameter of the inlet pipe 13c is formed at a portion of the filtering member 15a facing the inlet pipe 13c so that the inlet pipe 13c is not blocked even when the inlet pipe 13c is moved in the vertical direction. It is provided. By doing so, even if the filtering member 15a moves in the vertical direction, the inlet pipe 13c does not enter the opening 15b and does not block the inlet pipe 13c, and is always filled with hydraulic oil. There will be no abnormalities in the operation.

Although the present invention has been described as applied to an oil pan of a vehicle transmission, the present invention is not limited to this. For example, the liquid is applied to the upper part or side part of a tank for storing drinking water or the like. The present invention can be similarly applied to a device provided with an inflow port, and fine gravel, metal powder and the like mixed in water can be captured.

Sectional drawing of the filtration structure of the liquid storage container to which this invention is applied. 1 is a schematic side view of an automatic transmission device for a vehicle. Sectional drawing of the modification of this invention. Sectional drawing of the filtration structure of the conventional liquid storage container.

Explanation of symbols

11 Inlet 12 Fluid storage container 12a Bottom wall 12b Side wall 14 Outlet (oil feed passage)

15 Filtration member

Claims (1)

  A liquid storage container is formed by the side wall and the bottom wall of the casing, and a liquid inlet and outlet are provided on the upper or side wall of the casing. A filtering member such as a three-dimensional nonwoven fabric is in contact with the side wall and is attached to the bottom wall. A filtration structure for a liquid storage container, which is placed.

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