JPH09173723A - Oil strainer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deformation and failure of the part corresponding to the lower side of the outlet pipe of a sheet-like brazing filler metal as an oil strainer for an automatic speed changer for vehicles made of synthetic resin. SOLUTION: This oil strainer is constituted by disposing the sheet-like brazing filler metal 13, such as wire net, between a synthetic resin tray-like lower body 11 made of a synthetic resin which has the upward facing outlet pipe 11a in one side part and has many downward projections 11b on the inside surface and a synthetic resin tray-like lower body 12 which has an inlet pipe 12a in the other side part, welding its peripheral edge to the inner step part 11c on the peripheral side of the upper body and welding the peripheral edges of the upper and lower bodies to each other. In such a case, the lower inlet part of the outlet pipe 11a is provided with a rib 14 projecting into the body to a straight shape and a small projector 14a is formed on the rear surface in the central part of the rib 14. The surface of the brazing filler metal 13 is pressed to this small projection 14a to prevent the deformation of the brazing filler metal 13 even if the strong pressure of the oil acts on the part on the outlet side of the brazing filler metal 13 at the time of use.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil strainer, and more particularly to an improvement of an oil strainer for treating hydraulic oil in an automatic transmission of a vehicle.

[0002]

2. Description of the Related Art In an automatic transmission using a torque converter which is widely used in vehicles, a valve chamber C accommodating various control valves is provided under a transmission gear casing A as shown in FIG. In this way, an oil pan B accommodating hydraulic oil is attached inside, and the hydraulic oil is sucked up by a pump P in the casing A to operate the torque converter T or operate the valve. An oil strainer S is provided on the lower side to constantly filter the circulating hydraulic oil.

As the oil strainer S, as shown in FIG. 7, a dish-shaped upper body 1 such as a square or ellipse provided with an upward outlet pipe 1a which is mounted on the valve chamber C on one side. And the inlet pipe 2a facing downward on the other side
In order to reduce the weight of the device, the dish-shaped lower body 2 provided with is made of a heat-resistant synthetic resin such as polyamide or fluorine, and 200 mesh or 300 mesh between the two bodies 1 and 2.
A thin plate-like filter medium 3 made of mesh or filter paper or non-woven fabric of mesh size is arranged, and the thin plate-like filter medium 3 is restrained by a large number of projections 1b provided on the lower surface of the upper body 1, while its peripheral portion is covered by the upper body 1. A wire mesh is used to weld to the inner step around the circumference of the body with high frequency, and with filter paper or non-woven fabric, it is welded with ultrasonic waves, after which the opposite peripheral edges of the upper and lower bodies 1 and 2 are friction welded. ing.

[0004]

When the above oil strainer is used, the oil in the oil pan B is removed by the operation of the oil pump P connected to the outlet pipe 1a.
From the inlet pipe 2a to the inside of the lower body 2 and is filtered by traversing the thin plate-shaped filter medium 3 and sent through the outlet pipe 1a to the lubrication section and control section of the apparatus. Since the road cross section is considerably smaller than the area of the filter medium 3 (about 1/15 to 1/20), oil concentrates in the lower part of the outlet pipe 1a.

By the way, in the above-mentioned conventional oil strainer, there is no means for restraining the filter medium 3 in the lower portion of the outlet pipe 1a, so that the filter medium is apt to be deformed by the pressure of oil, and as shown by the dotted line in the case of long-term use. It deforms and cracks or breaks causing troubles in the transmission.

Therefore, the present invention, as an oil strainer made of synthetic resin used in an automatic transmission of a vehicle, prevents deformation, cracks, and damage of a thin plate-like filter material in a lower portion of an outlet pipe, thereby causing a trouble on the transmission side. The task is not to do so.

[0007]

Under the above-mentioned problems, the present invention provides a synthetic resin dish-shaped upper body having an upward outlet pipe on one side thereof and a plurality of downward protrusions of a predetermined height on the inner surface thereof. , A synthetic resin dish-shaped lower body having an inlet pipe on the other side, and a thin plate-shaped filter medium disposed between these bodies, and the peripheral edges of the filter medium are welded together at the opposite peripheral edges of the upper and lower bodies. As an oil strainer for welding the part to the body, a rib that bulges into the body is provided at the lower inlet part of the outlet pipe of the upper body, and one or more downward projecting pieces are formed on the lower surface of the rib. It is characterized in that the surface of the filter medium is brought into contact with the projection on the inner surface of the body and is brought into contact with the small protrusions on the lower surface of the rib.

[0008]

1 and 2 show an example of an oil strainer S according to the present invention, the plane of which is rectangular,
A dish-shaped upper body 11 having an oval shape, an arc shape, or the like and having an upward outlet pipe 11a on one side, and a dish-shaped lower body 12 having the same shape and a downward inlet pipe 12a on the other side. Is made of a heat-resistant and strong synthetic resin such as a polyamide resin or a fluorine resin to which glass fibers are added. The inner surface of the upper body 11 is provided with a plurality of downward protrusions 11b of a predetermined height, and the peripheral portion is Is formed with an inner step 11c having the same height as the protrusion 11b.

At the lower end of the outlet pipe 11a, a narrow rib 1 that bulges inside the body across the inlet.
4 is provided in the shape of a letter, and a downward small protrusion 14a is formed on the lower surface of the central portion of the rib 14, and the protrusion height of the rib 14 and the height of the small protrusion 14a are added together. The height of the protrusion 11b on the inner surface of the body is substantially the same.

There are two meshes inside the upper body 11 as described above.
A thin plate-like filter medium 13 such as stainless steel or brass wire mesh or filter paper, non-woven fabric of about 00 mesh to 300 mesh is brought into contact with the surface of the projections 13a and the lower surface of the small protrusion 14a under the ribs. The wire mesh is welded to the inner stepped portion 11c around the body by high frequency, and the filter paper and the non-woven fabric are ultrasonically welded.
Next, the lower body 12 is disposed below the upper body 11 so as to face each other, and their abutting peripheral edge portions are friction welded to each other to form one oil strainer S.

The outlet pipe 11a is connected to the oil pan B.
The oil strainer S is fitted in the passage portion of the valve chamber C disposed therein with the interposition of the packing material, and the oil strainer S is
Used by being installed on the underside of the.

Therefore, as described above, by operating the oil pump, the oil in the oil pan flows into the body from the inlet pipe 12a of the lower body 12, and is filtered by passing through the thin plate-like filter medium 13, and the outlet pipe. The oil is sent to the lubrication section and the control section of the transmission through 11a, but in the process, oil concentrates on the lower part of the outlet pipe 11a, and strong oil pressure is applied to the lower side of the filter medium 13 in that part. However, since the thin plate-shaped filter medium 13 is in contact with the small protrusion 14a on the lower surface of the central portion of the one-sided rib 14 on the lower side of the outlet pipe 11a, the gap between the filter medium 13 and the rib 14 is maintained, and the oil It is possible to prevent the flow resistance of the filter from increasing and to prevent the filter medium 13 from being deformed.

3 and 4, ribs 14 are provided at the lower inlet portion of the outlet pipe 11a so as to bulge out in a cross shape, and small protrusions 14a are provided at regular intervals on the lower surfaces of the vertical and horizontal ribs 14, respectively. 5 shows an example in which the ribs 14 are formed in pairs, and FIG. 5 shows that ribs 14 are provided in a three-forked shape at the lower inlet portion of the outlet pipe 11a, and small protrusions 14a are formed on the lower surfaces of the ribs 14 on three sides. If the plurality of small protrusions 14a are provided at intervals on the lower surface of the rib as described above, the deformation of the thin plate-like filter medium 13 can be more reliably prevented. In addition, the flow resistance of oil can be reduced and the flow of oil can be made smooth.

In the above example, the peripheral portion of the filter medium 13 is welded to the inner step portion 11c of the upper body 11 and the upper and lower bodies 11 and 12 are joined together. It may be sandwiched between the peripheral portions of the bodies 11 and 12 and the upper body and the lower body may be welded together at the same time by a method suitable for the material of the filter medium.

[0015]

The present invention has a dish-shaped upper body made of synthetic resin having an upward outlet pipe on one side and a large number of downward projections on the inner surface, and a synthetic resin having a downward inlet pipe on the other side. As an oil strainer for an automatic transmission of a vehicle, which is composed of a dish-shaped lower body and a thin plate-shaped filter medium arranged between them, a rib that bulges into the body at the lower inlet portion of the outlet pipe of the upper body. Since one or a plurality of small protrusions are formed on the lower surface of the rib and the surface of the filter medium is brought into contact with the small protrusions, the oil collects in the lower part of the outlet pipe during use and the thin plate Even if a strong pressure is applied to the lower side of the filter medium, there is no large deformation, cracking, or damage to the filter medium as before, and there is no fear of causing transmission trouble due to the outflow of untreated oil, and , Tension on the rib surface of the filter medium Marked with are prevented, it can flow oil resistance less smoothly.

[Brief description of the drawings]

FIG. 1 is a sectional view of an example of an oil strainer according to the present invention.

FIG. 2 is a bottom view of the lower inlet portion of the outlet pipe viewed from the XX line direction in FIG.

FIG. 3 is a sectional view of another example of the oil strainer.

FIG. 4 is a bottom view of the lower inlet portion of the outlet pipe in the example of FIG.

FIG. 5 is a bottom view of still another example of the lower inlet portion of the outlet pipe.

FIG. 6 is a schematic side view of an automatic transmission of a vehicle.

FIG. 7 is a cross-sectional view of a conventional oil strainer made of synthetic resin.

[Explanation of symbols]

 11 Upper Body 11a Outlet Pipe 11b Downward Protrusion 12 Lower Body 12a Inlet Pipe 13 Filter Material 14 Rib 14a Small Mouth B Oil Pan C Valve Chamber S Oil Strainer

Claims (1)

[Claims] 1. A synthetic resin dish-shaped upper body having an upward outlet pipe on one side and having a plurality of downward projections of a predetermined height on the inner surface, and a synthetic resin dish having an inlet pipe on the other side. -Shaped lower body and a thin plate-shaped filter medium disposed between the bodies, and in the oil strainer that welds and joins the opposing peripheral edge portions of the upper and lower bodies and welds the peripheral edge portions of the filter medium to the body, A rib that bulges into the body is provided at the lower inlet portion of the outlet pipe, and one or a plurality of downward small protrusions are formed on the lower surface of the rib, and the surface of the filter medium is brought into contact with the protrusion on the inner surface of the body. An oil strainer characterized by being brought into contact with a small protrusion on the lower surface of the rib.