JP3462345B2 - Oil strainer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil strainer used in an automatic transmission of an automobile and the like, and more particularly to an oil strainer having two types of filter members having different eye roughness.

[0002]

2. Description of the Related Art Conventionally, various types of oil strainers used for automatic transmissions of automobiles have been proposed, for example, a cup-shaped oil strainer made of a synthetic resin having an inlet. A case, which is provided between the lower case and a case formed of a synthetic resin cup-shaped upper case that is provided so as to face the lower case and has an outlet, and is interposed between the both cases, and between the peripheral portions of both cases It is generally known to have a filter member which is a felt-like non-woven fabric made of fibers such as nylon and polyester whose peripheral portions are clamped and fixed.

In this case, the filter member is formed by folding a sheet-like member into two and forming a bag-like shape, and the peripheral portions excluding the bent portions are the peripheral portion of the lower case and the peripheral portion of the upper case. It is sandwiched and fixed between the two. A void is formed inside the filter member, and the void communicates with the inlet of the lower case through an opening provided in a part of the filter member.

When the oil strainer having the above-described structure is installed in an automatic transmission of an automobile and the oil acts on the inlet of the lower case, the oil flows into the inside of the filtering member from the inlet, and the filtering member And then flows into the case. Then, impurities such as scale contained in the oil are removed when passing through the filtering member, and oil not containing them flows into the case, flows through the case, acts on the outlet of the upper case, and flows out. It flows out of the case from the outlet. Then, by repeating such a process, oil containing no impurities such as scale can be supplied to the lubricating portion.

However, in the conventional oil strainer configured as described above, since the roughness of the filter member is uniformly formed over the whole, the size of particles that can be removed is limited. As a result, fine particles smaller than a certain size cannot be removed. Therefore, in order to remove such fine particles, it is necessary to make the roughness of the filter member of the oil strainer fine or to separately install an external filter capable of removing the fine particles. However, if the mesh of the filter member of the oil strainer is made finer, it will not be possible to secure the required hydraulic pressure due to the increased oil resistance, and if an external filter is installed, the number of components will be reduced. Will increase and maintenance will be troublesome.

The present invention has solved the above-mentioned problems of the conventional ones, and does not reduce the hydraulic pressure, and does not increase the number of constituent parts, and impurities such as scales of fine particles. It is an object of the present invention to provide an oil strainer with high filtration performance that can reliably filter oil.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, a sheet-shaped first filtering member is folded into two and is placed on the upper part of a lower case having an inlet. An upper case having an outflow port is located above the first filtering member, and a peripheral portion of the upper case is joined to a peripheral portion of the lower case, and the first case is provided between the peripheral portions of both cases.
In an oil strainer configured to clamp and fix a peripheral edge portion of the filtering member excluding a bent portion , a portion closer to the outlet of the upper case on the inner surface side of the first filtering member than the first filtering member. This means employs a means in which a fine second filter member is provided in close contact. Also, the above
1 The filtration member is formed of non-woven fabric, and the second filtration is performed.
It adopts a means in which the member is formed of non-woven fabric or filter paper .

[0008]

According to the present invention, by adopting the above means, when oil acts on the inflow port, the oil flows into the inside of the first filtering member from the inflow port, and the second filtering member and the first filtering member are removed. It flows into the case through the case, flows in the case, acts on the outlet, and flows out of the case from the outlet. Since the second filtering member has finer meshes than the first filtering member, finer particles can be filtered by the second filtering member than particles that can be filtered by the first filtering member.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an oil strainer according to the present invention will be described below. 1 and 2
1 shows an embodiment of an oil strainer according to the present invention. FIG. 1 is a longitudinal sectional view showing the whole, and FIG. 2 shows the relationship between the first filtering member and the second filtering member shown in FIG. It is an explanatory view shown.

That is, the oil strainer 1 shown in this embodiment is a synthetic resin cup-shaped lower case 3 having an inflow port 4, a synthetic resin having an outflow port 8 provided opposite to the lower case 3. A case 2 including a cup-shaped upper case 7 made of a resin, a first filtering member 11 whose peripheral portions are sandwiched and fixed between the peripheral portions of the cases 3 and 7, and an inner surface side of the first filtering member 11 The second filtering member 15 is provided in close contact with the second filtering member 15.

At the peripheral edge of the opening of the lower case 3, a flange portion 5 projecting outward is integrally provided over the entire circumference, and
A step portion 6 that is one step lower than the flange portion 5 is integrally provided on the inner peripheral side of the flange portion 5 over the entire circumference, and a peripheral edge portion of a first filtering member 11 described later is located in the step portion 6. is there.

A flange portion 9 which projects outward is integrally provided on the peripheral edge of the opening of the upper case 7 over the entire circumference, and
A protrusion 10 that is one step higher than the collar 9 is integrally provided on the inner peripheral side of the collar 9 over the entire circumference, and the protrusion 10 and the lower case 3
The peripheral portion of the first filtering member 11 described later is sandwiched and fixed between the step portion 6 and the step portion 6.

The first filtering member 11 is a felt-like non-woven fabric made of fibers such as nylon and polyester, and is formed into a bag by folding a sheet-like non-woven fabric into two. The peripheral edge portion of the first filtering member 11 excluding the bent portion is clamped and fixed between the peripheral edge portion of the lower case 3 and the peripheral edge portion of the upper case 7, and the peripheral edge portion of the opening 12 provided in a part is lowered. It is integrally joined to the peripheral portion of the inflow port 4 of the case 3 by heat fusion or the like. The first filter member 11 is formed to have coarser eyes than the second filter member 15 described later.

The second filtering member 15 is a felt-like non-woven fabric made of fibers such as nylon and polyester like the first filtering member 11, and the outlet 8 of the upper case 7 on the inner surface side of the first filtering member 11. Close to (the part with the highest flow velocity)
Is integrally joined by ultrasonic welding, thermocompression bonding, or the like. The second filter member 15 has finer meshes than the first filter member 11, and can filter even fine particles that cannot be filtered by the first filter member 11.

When the second filtering member 15 is used in a place where oil circulates, the second filtering member 15 is not located near the outflow port 8 of the upper case 7 but on another portion on the inner surface side of the first filtering member 11. It may be provided. Further, since the second filter member 15 is formed with finer meshes than the first filter member 11, the oil passage resistance increases and the hydraulic pressure decreases, but the second filter member 15 can be used in accordance with the required hydraulic pressure. A desired hydraulic pressure can be obtained by setting the area, thickness, etc. of the filtering member 15.
The second filtering member 15 may be formed of filter paper or the like, and in that case, the second filtering member 15 may be bonded to the inner surface of the first filtering member 11 with an adhesive or the like. .

To clamp and fix the peripheral portion of the first filtering member 11 between the lower case 3 and the upper case 7, the first filtering member 1
The bent portion 1 is located in the step 6 of the lower case 3, and the protrusion 10 of the upper case 7 is located in the step 6 with the peripheral edge of the first filtering member 11 interposed. The peripheral portions of both cases 3 and 7 may be integrally joined by vibration welding or the like.

When the oil strainer 1 according to this embodiment configured as described above is mounted on an automatic transmission of an automobile and the like, and the oil acts on the inflow port 4 of the lower case 3, the oil flows from the inflow port 4 to the inflow port 4. The second filtering member 15 and the first filtering member 11 flow into the inside of the first filtering member 11.
And flows into the case 2. Then, it flows in the case 2, acts on the outlet 8 of the upper case 7, and flows out of the case 2 from the outlet 8. Then, by repeating this, impurities such as scale contained in the oil can be removed.

In the oil strainer 1 according to the present embodiment configured as described above, a portion having a finer mesh than the first filtering member 11 is provided in a portion near the outlet 8 on the inner surface side of the first filtering member 11. By providing the second filtering member 15, even the fine particles that cannot be filtered by the first filtering member 11 can be filtered by the second filtering member 15. Therefore, the filtration performance is significantly improved. And
Since the second filtering member 15 is provided on a part of the inner surface side of the first filtering member 11, it does not occur that the oil passage resistance as a whole becomes too large and a predetermined hydraulic pressure cannot be obtained. It will be possible to secure a sufficient hydraulic pressure. Then, in the case 2, two kinds of filtering members 11,
The provision of 15 eliminates the need for an external filter, reduces the number of components, and reduces the labor required for maintenance.

[0019]

As described above, according to the present invention, the first filter member is provided in the case and the first filter member is provided.
1 In the portion near the outlet of the upper case on the inner surface side of the filtering member,
The second filter member, which is finer than the first filter member, was brought into close contact.
Since it was installed in the state, the oil that flowed into the inlet of the lower case
Flow through the first filter member toward the outlet of the upper case.
Large particles of dust contained in the oil
The child is allowed to settle in the first filtering member due to its own weight.
In addition, it is so small that it cannot be filtered by the first filter member.
The particles reach the second filtration member by the flow of oil and
2 It will not be captured by touching the filter member.
Ri, so that the filtration performance is greatly improved. In addition, the second filter member causes the outflow of the upper case on the inner surface side of the first filter member.
Since it is provided in the portion close to the mouth, even if the oil passes through the second filtering member, the oil passage resistance as a whole does not become too large, and the predetermined hydraulic pressure is not lost .
A sufficient hydraulic pressure can be secured. Further, the second filtering member is provided on the inner surface side of the first filtering member.
Therefore , an external filter having the same function as the second filtering member is not required, the number of constituent parts can be reduced, and the labor required for maintenance can be reduced. Further, the second filtering member is a non-woven fabric or filter paper, and the first filtering member.
Since the excess material is made of non-woven fabric, the mesh-shaped filter
It is possible to enhance the ability to capture dusts compared to excess materials.
It

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an overall embodiment of an oil strainer according to the present invention.

FIG. 2 is an explanatory view showing the relationship between the first filtering member and the second filtering member shown in FIG.

[Explanation of symbols]

1 ... Oil strainer 2 ... Case 3 ... Lower case 4 ... Inlet 5, 9 ... Tsubabe 6 ... Step 7 ... Upper case 8: Outlet 10 ... Projection 11 ... First filtering member 12 …… Aperture 15 ... Second filtering member

Claims (2)

(57) [Claims] 1. A sheet-shaped first filtering member is folded into two and is located above a lower case having an inlet, and an upper case having an outlet is located above the first filtering member. In the oil strainer, the peripheral portion of the upper case is joined to the peripheral portion of the lower case, and the peripheral portion of the first filtering member excluding the bent portion is clamped and fixed between the peripheral portions of both cases. An oil strainer characterized in that a second filter member, which is finer than the first filter member, is provided in close contact with a portion of the inner surface of the first filter member near the outflow port of the upper case . 2. When the first filtering member is formed of non-woven fabric
The oil strainer according to claim 1 , wherein the second filter member is formed of non-woven fabric or filter paper .