JP2002054418A - Oil strainer, and method of manufacturing same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an oil strainer. SOLUTION: This oil strainer is provided with an oil suction port 2, an oil discharge port 3, pipe type flow passages 1 and 4 to connect the suction port 2 to the discharge port 3, and a fixing part 8 to the engine side. A screen member 5 is inserted from the discharge port 3 toward the inside of the pipe type flow passages 1 and 4, and a gap is formed between an outer circumferential surface of the screen member 5 and an inner circumferential surface of the pipe type flow passages 1 and 4. Large-sizing on the side of the suction port 2 as in conventional devices is thus eliminated, and need of forcibly inserting the screen member 5 from the side of the suction port 2 into the pipe type flow passages 1 and 4 is also eliminated, thereby an oil strainer with favorable sealing performance and filtration efficiency can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil strainer disposed between an oil pump and an oil pan of an engine in an internal combustion engine for filtering foreign matter in circulating oil stored in the oil pan, and a method of manufacturing the same. It is.

[0002]

2. Description of the Related Art As a conventional oil strainer of this kind,
Japanese Unexamined Patent Application Publication No. 7-26929 discloses one. Although not specifically shown, the conventional oil strainer includes a metal pipe-shaped main body having an oil suction port and a discharge port, and has a configuration in which a screen member is disposed on the suction port side. Therefore, in order to obtain a large filtration area, it is necessary to naturally increase the size of the suction port side. For this reason, there is a dislike that the weight of the oil strainer itself becomes heavy or the structure becomes complicated.

Therefore, an improved type oil strainer disclosed in Japanese Patent Application Laid-Open No. 8-112138 has been proposed. The improved type oil strainer has a pair of synthetic resin divided bodies, and obtains a pipe-shaped main body by welding the peripheral edges of the pair of synthetic resin divided bodies, and pipes the screen member from the suction port side. It is configured to be inserted deep inside the main body.

[0004]

Therefore, in this improved oil strainer, the pipe-shaped main body is constituted by a pair of synthetic resin divided bodies, and a screen member is inserted into the pipe-shaped main body. In this regard, the problem of the conventional oil strainer described above can be solved for the time being, but on the other hand, inserting the screen member inside the pipe-shaped main body, even though the screen member is supported by support ribs etc. In addition, rattling may occur during traveling, resulting in poor sealing performance, or a portion of the screen member may be damaged by burrs generated during welding of the pair of synthetic resin divided bodies.

[0005]

SUMMARY OF THE INVENTION The present invention has been developed to effectively solve the problems of conventional oil strainers including such an improved oil strainer. A suction port, an oil discharge port, a pipe-shaped flow path connecting the suction port and the discharge port, and a fixed portion to the engine side, and a screen is provided from the discharge port toward the inside of the pipe-shaped flow path. An oil strainer is provided in which a member is inserted to define a gap between the outer peripheral surface of the screen member and the inner peripheral surface of the pipe-shaped flow path.

According to a second aspect of the present invention, there is provided an oil suction port, an oil discharge port, a pipe-shaped flow path connecting the suction port and the discharge port, and a fixed portion to the engine. An oil strainer is provided in which a screen member is inserted from an outlet toward an inside of an opening formed on the engine side, and a gap is defined between an outer peripheral surface of the screen member and an inner peripheral surface of the opening.

According to a third aspect of the present invention, based on the first aspect, the screen member is formed integrally with the discharge port side.
Provided is an oil strainer inserted into a pipe-shaped flow path formed separately from a screen member.

According to a fourth aspect of the present invention, based on the first to third aspects, there is provided an oil strainer provided with a suction port positioning means on the oil pan side.

According to a fifth aspect of the present invention, a pipe body having a large-diameter portion and a small-diameter portion is continuously formed by an extrusion molding method, and the large-diameter portions located at both ends are cut, thereby forming one of the pipes. Provided is a manufacturing method for manufacturing an oil strainer in which a cut large-diameter portion serves as a suction port and the other cut large-diameter portion serves as a discharge port.

Therefore, according to the first aspect of the present invention,
A screen member is inserted from the outlet of the oil strainer into the inside of the pipe-shaped flow path, and a gap is defined around it.There is no need to worry about the suction port becoming unnecessarily large as in the past. There is no need to forcibly insert the screen member into the inside of the pipe-shaped flow path from the mouth side, so that it is possible to provide an oil strainer with good sealing properties and high filtration efficiency.

According to the second aspect of the present invention, a screen member is inserted from the discharge port of the oil strainer into an opening formed on the engine side, and a gap is defined around the screen member. Again, unlike the conventional case, there is no need to worry about the suction port becoming too large, and there is no need to forcibly insert the screen member from the suction port side into the pipe-shaped flow path. It is possible to provide a good oil strainer.

According to the third aspect of the invention, since the screen member is integrally formed on the discharge port side, the structure is extremely simplified. According to the fourth aspect of the present invention, the suction port of the oil strainer can be positioned because the suction port positioning means is provided on the oil pan side, so that the oil can be reliably sucked.

According to the fifth aspect of the present invention, a pipe body having a large-diameter portion and a small-diameter portion is continuously formed by an extrusion molding method, and only the large-diameter portions located at both ends are cut.
An oil strainer having an oil inlet and an oil outlet can be easily provided.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an oil strainer according to a first embodiment of the present invention; FIG. Pipe-shaped body 1 having a discharge port 3, a cylindrical flange member 4 connected to the discharge port 3 side of the pipe-shaped body 1, and a cylindrical screen member inserted inside the flange member 4. 5 parts, any one of the parts 1 and 4
5 is also an integrally molded product of synthetic resin. In addition, specifically,
The above-mentioned pipe-shaped main body 1 and the flange member 4 constitute a pipe-shaped flow path.

The first pipe-shaped main body 1 has a large-diameter portion 1a at both ends and a small-diameter portion 1b at an intermediate position.
As shown in the drawing, desired corrugations are applied to six corrugated portions intermittently applied to the small-diameter portion 1b. At the time of molding, as shown in FIG. The pipe body having the portion 1a and the small-diameter portion 1b is continuously formed in a straight line, and the large-diameter portions 1a, 1a located at both ends are cut, whereby one of the cut large-diameter portions 1a is cut. Is formed as a suction port 2, and the other cut large diameter portion 1 a is formed as a discharge port 3. It should be noted that a plurality of slits 7 are formed in the large-diameter portion 1a serving as the suction port 2 by post-processing to prevent sticking to the bottom of the oil pan.

As shown in FIG. 3, the second flange member 4 has an elliptical flange 8 serving as a fixing portion to the engine side, and a cylindrical storage chamber 9 hanging from the flange 8. The flange 8 is formed with a concave edge 10 for receiving a flange 14 of the screen member 5 described later on the upper surface, and a concave groove 11 for fitting a seal ring 12 on the outer peripheral side. The screen member 5 is inserted into the storage chamber portion 9 with a certain gap defined inside, and the discharge member 3 is pulled out when the discharge port 3 side of the pipe-shaped main body 1 is fitted to the outside. It has a configuration in which a plurality of annular claw portions 13 for preventing disengagement are provided.

The third screen member 5 has a circular flange portion 1 which is received by the concave edge 10 on the flange member 4 side.
4 and a mesh-shaped filtering portion 15 hanging from the collar portion 14
In the state where the plurality of reinforcing ribs 5a extending in the axial direction protrude outward from the surface of the filtering portion 15 and the screen member 5 is inserted into the storage chamber portion 9 of the flange member 4, In addition, a sufficient gap can be defined between the outer peripheral surface of the filtering unit 15 and the inner peripheral surface of the storage chamber 9.

Accordingly, in the oil strainer having such a configuration, the discharge port 3 side of the pipe-shaped main body 1 is fitted to the storage chamber 9 of the flange member 4 while the screen member 5 is connected to the discharge port 3.
4, the flange 8 of the flange member 4 is fixed to the engine E side with a screw as shown in FIG. The flange 14 is sandwiched between the flange 8 of the flange member 4 and the block of the engine E and is securely held, so that the suction port 2 of the pipe-shaped main body 1 faces the oil pan P later. More specifically, the circulating oil stored in the oil pan P passes from the suction port 2 of the pipe-shaped main body 1 to the inside of the storage chamber 9 of the flange member 4 through the inside of the pipe-shaped main body 1, where Foreign matter is filtered by the filtration unit 15 of the screen member 5 and flows into an oil pump (not shown) of the engine E.

Therefore, in the first embodiment, unlike the related art, there is no need to worry about the size of the suction port 2 being unnecessarily large, and the screen member 5 is inserted into the pipe-shaped main body 1 from the suction port 2 side. Since there is no need to forcibly insert the oil strainer, it is possible to provide an oil strainer having a high sealing efficiency and a high filtering efficiency.

In this case, if the flange portion 14 of the screen member 5 and the concave edge 10 of the flange member 4 are tapered in opposite directions to each other, before fixing to the engine E side,
Since the screen member 5 can be temporarily fixed to the flange member 4 side, the handling becomes extremely good. Further, when the suction port 2 of the pipe-shaped main body 1 faces the inside of the oil pan P, a depression 1 is formed at the bottom of the oil pan P as shown in FIG.
6, and the suction port 2 of the pipe-shaped main body 1 is provided in the recess 16.
Or a plurality of large projections 17 into which the suction port 2 is fitted are provided at the bottom of the oil pan P as shown in FIG.
The suction port 2 is held inside each of the large projections 17, or a plurality of small projections 18 are provided on the periphery of the drain cock of the oil pan P as shown in FIG. If the suction port 2 is covered by the jig 19,
Since the suction port 2 of the pipe-shaped main body 1 can be positioned by these means for positioning the suction port 2, reliable suction of the circulating oil is possible.

As for the flange member 4 described above,
The outer surface of the storage chamber 9 is formed in a straight shape, and a plurality of annular claws 13 for projecting and preventing the pipe-shaped main body 1 from coming off are provided at a lower portion thereof, as shown in FIG.
It is also optional to increase the diameter of the upper side to increase the amount of oil flowing into the storage chamber 9 according to the implementation.

Next, an oil strainer according to a second embodiment will be described. In contrast to the first embodiment in which the flange member 4 and the screen member 5 are formed separately,
According to the second embodiment, as shown in FIG. 7, a screen member 5 having a conical shape with respect to the inside of a flange member 4 is provided.
Are integrally formed. The direction of the screen member 5 may be downward or upward as shown in the figure.
Is stored without protruding inside the storage chamber portion 9 in a conical shape, so that the angle at which the oil changes direction can be reduced, and the oil flow resistance can be effectively reduced. The integration of the two members 4 and 5 can also be expected to simplify the structure of the oil strainer itself.

Therefore, even in the second embodiment, there is no need to worry about the suction port 2 becoming too large unlike the related art, and the screen member 5 is connected to the pipe-shaped main body 1 from the suction port 2 side. Since it is not necessary to insert the oil strainer inside the oil strainer, it is possible to provide an oil strainer having a good sealing property and a high filtration efficiency.

Finally, the oil strainer according to the third embodiment will be described. The third embodiment is different from the second embodiment in that the screen member 5 is formed integrally with the flange member 4. Similar, but different,
As shown in FIG. 8, the screen member 5 is integrally protruded outward from the flange 8 of the flange member 4, and the screen member 5 is inserted into the opening 20 opened on the engine E side. It is characterized by the following. In this case, a gap is defined between the outer peripheral surface of the screen member 5 and the inner peripheral surface of the opening 20 as in the first embodiment.

Therefore, even in the third embodiment, there is no need to increase the size of the suction port 2 as in the related art, and the screen member 5 is connected to the inside of the pipe-shaped main body 1 from the suction port 2 side. This eliminates the need to forcibly insert the oil strainer into the oil strainer, thereby providing an oil strainer with a good sealing property and high filtration efficiency.

[0026]

As described above, according to the present invention, according to the first aspect of the present invention, the screen member is inserted from the discharge port of the oil strainer into the inside of the pipe-shaped flow path by using the above structure.
Because there is a gap around the periphery, there is no need to worry about the intake side becoming too large as in the past, and there is no need to forcibly insert the screen member into the pipe-shaped flow path from the intake side. In addition, it is possible to provide an oil strainer having a good sealing property and a high filtering efficiency.

According to the second aspect of the present invention, a screen member is inserted into an opening formed on the engine side from the discharge port of the oil strainer, and a gap is formed around the screen member. As described above, there is no need to worry about the suction port side becoming too large, and it is not necessary to insert the screen member from the suction port side into the inside of the pipe-shaped flow path. Can be provided.

According to a fifth aspect of the present invention, a pipe body having a large diameter portion and a small diameter portion is continuously formed by an extrusion molding method.
An oil strainer having an oil inlet and an oil outlet can be easily provided simply by cutting the large diameter portions located at both ends.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an oil strainer according to a first embodiment of the present invention.

FIG. 2 is an explanatory view illustrating a method for manufacturing a pipe-shaped main body.

FIG. 3 is a sectional view of a flange member.

FIG. 4 is a partially cutaway explanatory view showing a state in which an oil strainer is fixed to an engine side and a suction port thereof faces an oil pan side.

5 (A), 5 (B), and 5 (C) are explanatory views showing a suction port positioning means provided on the oil pan side.

FIG. 6 is a sectional view showing another example of the flange member.

FIGS. 7A and 7B are cross-sectional views showing a relationship between a screen member and a flange member in an oil strainer according to a second embodiment.

FIG. 8 is a cross-sectional view of a main part showing a state where the oil strainer according to the third embodiment is fixed to the engine side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe-shaped main body 1a Large diameter part 1b Small diameter part 2 Suction port 3 Discharge port 4 Flange member 5 Screen member 5a Reinforcement rib 6 Corrugate 7 Slit 8 Flange part 9 Storage chamber part 10 Concave edge 11 Concave groove 12 Seal ring 13 Ring claw Part 14 Flange 15 Filtration part 16 Depression 17 Large projection 18 Small projection 19 Jig 20 Opening E Engine

Claims (5)

[Claims] 1. An oil suction port, an oil discharge port,
A pipe-shaped flow path connecting the suction port and the discharge port, and a fixing portion to the engine side, a screen member is inserted from the discharge port toward the inside of the pipe-shaped flow path, An oil strainer, wherein a gap is defined between an outer peripheral surface and an inner peripheral surface of a pipe-shaped flow path. 2. An oil inlet, an oil outlet,
A pipe-shaped flow path connecting the suction port and the discharge port, and a fixing portion to the engine side, and a screen member is inserted from the discharge port toward the inside of the opening formed on the engine side, An oil strainer, wherein a gap is defined between an outer peripheral surface of the screen member and an inner peripheral surface of the opening. 3. The oil according to claim 1, wherein the screen member is formed integrally with the discharge port side and inserted into a pipe-shaped flow passage formed separately from the screen member. strainer. 4. The oil strainer according to claim 1, further comprising means for positioning the suction port on the oil pan side. 5. A pipe body having a large-diameter portion and a small-diameter portion is continuously formed by an extrusion molding method, and the large-diameter portions located at both ends are cut. A suction port, and the other cut large diameter portion as a discharge port to produce an oil strainer.