JP2008008273A - Oil strainer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil strainer wherein burrs are hardly formed in mesh-like fine holes of a filter, the forming state of the mesh-like fine hole is easily inspected, and a manufacturing process is simple. <P>SOLUTION: The oil strainer 1 is composed of an oil strainer body 3 with an oil passage 17 formed in it, having an oil flow-in port 7 at an end and an oil supply port 9 at the other end and a cylinder filter 5 provided in the oil passage 17 of the oil strainer body 3 having an opening 27 at an end. The filter 5 is molded so as to be separated into two parts along an opening center line and a resin first half body 31 and a second half body 33 in a half-cut shape with many mesh-like fine holes 29 are formed in a cylinder shape by making them abut on each other. A recessed part of the first half body 31 and a protruding part of the second half body 33 are fit and respective flanges 19 are engaged with an engaging part 21 of the oil strainer body 3 to hold them so as not to separate from each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an oil strainer, and more particularly to an improvement in an oil strainer in which a filter is disposed inside an oil strainer body.

Patent Document 1 includes an oil strainer body having an oil passage formed therein, and a cylindrical resin filter having an opening at one end and a large number of mesh pores formed on the entire outer periphery. An oil strainer is disclosed. The filter is made of a flexible mesh sheet, and two mesh sheets cut according to the shape of the filter are overlapped and the peripheral edges thereof are joined by heat welding or the like. An annular bag is formed around the opening of the cylindrical filter body made of a mesh sheet by injecting molten resin into the mold while the bag is opened and set in a mold and held in a cylindrical shape. The holder portion is formed and a frame portion is formed on the outer peripheral portion so that the filter body does not lose its shape. The filter configured in this way is arranged with the opening of the filter facing the oil inlet side located on the oil pan side of the oil strainer body, and a locking claw protruding from the outer peripheral surface of the filter Is engaged with an engagement hole formed on the inner peripheral surface of the oil strainer body, and is attached to the oil strainer body.
JP 2001-120920 A (page 3, FIG. 5)

  However, as in Patent Document 1, when a holder part or a frame part is formed on a filter body in which a large number of mesh-shaped pores are formed, a part of the mesh-shaped pores is exposed in the cavity forming these. However, since it inevitably comes into contact with the cavity, the molten resin injected into the cavity space forming the holder part and the frame part also penetrates into the mesh pores, and burrs are generated in the mesh pores around the holder part and the frame part. There is a problem that many can be made. As described above, a filter with many burrs cannot be made into a product because the original function of the filter is degraded. Therefore, after forming the holder part and the frame part in the filter body, it is necessary to inspect the formation state of the mesh-like pores of the filter, and inspection by visual inspection or image processing using a more efficient camera is performed. At this time, in order to inspect a cylindrical object, it is necessary to inspect the entire circumference, and inspection from one direction is not possible.

  In addition, since the holder body and the frame are formed on the filter main body in the next step after the filter main body is joined in advance by heat welding or the like, the manufacturing process is complicated.

  The present invention has been made in view of the above points, and the object of the present invention is that it is difficult to burr the mesh pores of the filter, and the formation state of the mesh pores can be easily inspected. An oil strainer having a simplified manufacturing process is provided.

  In order to achieve the above object, the present invention is characterized in that the half-shaped halves formed in advance are combined so as not to be separated by heat welding or the like.

  Specifically, the present invention includes an oil strainer body having an oil inlet at one end and an oil supply port at the other end, and an oil passage formed therein, and an oil passage of the oil strainer body. And a cylindrical filter having an opening at one end and a large number of mesh-shaped pores formed on the entire outer periphery, and the oil stored in the oil pan flows into the oil passage from the oil inlet and supplies oil. The following solution was taken for the oil strainer supplied to the internal combustion engine through the mouth.

  That is, in the first aspect of the present invention, the filter is formed so as to be divided into two along the center line of the opening, and the half-shaped resin first half in which a large number of mesh-shaped pores are formed. The body and the second half are butted against each other, and the butted portions of the first and second halves are held by holding means so as not to be separated from each other.

  According to a second aspect of the present invention, in the first aspect of the present invention, the holding means is formed in a concave portion formed in one of the butted portions of the first half and the second half, and in the other. And a convex portion that fits the concave portion, and a point-symmetrical position with respect to the center line of the opening of the outer peripheral surface of the filter is in contact with the inner peripheral surface of the oil strainer body.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the first half and the second half are each formed into a semicircular arc shape in cross section, and the first half and the second half are formed. An annular part having an opening is formed on one side of the body, and a semicircular arc part having an outer diameter smaller than the outer diameter of the annular part is continuously formed on the annular part. The inner peripheral surface of the opening of the other half is in contact with the surface.

  According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the filter has a polygonal cross section, and the first half and the second half are each formed with a butted portion. The opposing surface with the butted portion as one end is inclined with respect to the mold opening direction so as to be separated from each other as it approaches the abutting portion. A large number of mesh-shaped pores are formed penetrating in the mold opening direction.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, a flange is formed outwardly on the outer periphery of the butted portion of the first half and the second half. An engagement portion is formed on the inner peripheral surface of the oil strainer body to engage each flange in a state where the butted portions of the first half and the second half are butted against each other. Is also characterized by constituting holding means.

  According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, a bulging portion is formed at the opening end of the filter, and the oil supply port inner peripheral surface of the oil strainer body A step portion for supporting the bulge portion of the filter is formed, and the bulge portion of the filter is sandwiched between the oil strainer body and the internal combustion engine in a state where the oil strainer body is attached to the internal combustion engine.

  According to the first aspect of the present invention, the first half and the second half made of resin in which a large number of mesh-shaped pores are formed are formed in a halved shape and are brought into contact with each other to form a cylindrical filter. As in Patent Document 1, it is possible to suppress the intrusion of the resin into the mesh-shaped pores and the generation of burrs. Further, when inspecting the formation state of the mesh-shaped pores, the state before the butted portions of the first half and the second half are abutted with each other, that is, the first half and the second half Inspection can be performed from one direction as it is, and product inspection can be easily performed. Furthermore, since the butted portions of the first half and the second half are held by the holding means so as not to be separated from each other, an operation such as thermal welding is unnecessary and the manufacturing process can be simplified.

  According to the invention of claim 2, since the concave portion and the convex portion are fitted in the butted portion of the first half and the second half, the holding state of the butted portion is hardly improved and the butted portion is improved. It is possible to restrict the entry of foreign matter mixed in the oil from the part. Furthermore, since the point symmetrical position with respect to the center line of the opening on the outer peripheral surface of the filter is in contact with the inner peripheral surface of the oil strainer body, the movement of the filter in the oil passage is restricted, and the filter is placed in the oil passage. Can be stably maintained.

  According to the invention of claim 3, an annular part having an opening is formed in one of the first half and the second half, and a semicircular arc part is continuously formed in the annular part. Since the inner peripheral surface of the opening of the other half is in contact with the outer peripheral surface of the semicircular arc portion, the sealing performance around the opening of the filter made of a halved butted body can be improved.

  According to the invention according to claim 4, when the filter is formed into a polygonal shape, each surface which is a flat surface with the camera when inspecting the formation state of the mesh pores of the filter by image processing using a camera. Can be inspected while maintaining a constant distance from each other, so that the focus can be easily adjusted, and the focus can be easily set and the inspection accuracy can be improved as compared with the case where the inspection is performed by focusing on a curved surface. In addition, since the mesh-shaped pores are formed so as to penetrate in the mold opening direction, particularly in the case of a quadrangular cross section, simultaneously with the molding of the first half and the second half without using a slide mold. Mesh-like pores can be formed, and workability can be improved with a simple mold structure.

  According to the fifth aspect of the invention, the flanges projecting from the first half and the second half are engaged with the engaging portions formed on the inner peripheral surface of the oil strainer body. The filter can be held more stably in the oil passage by restricting movement of the butted portions of the half and second halves away from each other.

  According to the invention of claim 6, when the oil strainer is attached to the internal combustion engine, the filter is sandwiched between the oil strainer body and the internal combustion engine. It is not necessary to separately provide a means for attaching to the oil strainer body, and a simple structure can be obtained, and the labor of attaching work is not required.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
1 and 2 show an oil strainer 1 according to Embodiment 1 of the present invention. The oil strainer 1 includes a resin oil strainer main body 3 and a resin filter 5.

  The oil strainer body 3 has an oil inlet 7 at one end (lower end in FIGS. 1 and 2) and an oil supply port 9 at the other end (upper end in FIGS. 1 and 2). A rhombus-shaped mounting frame portion 11 is formed on the outer periphery so as to project outward. Bolts (not shown) are inserted into the mounting frame portion 11 when the oil strainer 1 is attached to the internal combustion engine 13. Two bolt insertion holes 15 are formed.

  An oil passage 17 is formed through the oil strainer body 3 so that oil stored in an oil pan (not shown) flows into the oil passage 17 from the oil inlet 7 and is connected to the oil supply port 9. Then, it is supplied to the internal combustion engine 13. Further, as shown in FIG. 3, an engagement portion 21 is formed on the inner peripheral surface 3 a of the oil strainer body 3 to engage a flange 19 (described later) provided on the filter 5. Further, a step portion 25 is formed on the inner peripheral surface of the oil supply port 9 of the oil strainer body 3 to support a bulging portion 23 of the filter 5 described later (see FIG. 2).

  On the other hand, as shown in FIGS. 4 and 5, the filter 5 is formed in a circular cylindrical shape in cross section and has an opening 27 at one end. The filter 5 is formed by abutting a half-shaped resinous first half 31 and a second half 33 which are formed so as to be divided into two along the center line of the opening. A large number of mesh-shaped pores 29 are formed in the second half 33 so as to penetrate in the mold opening direction of a molding die 55 described later. In FIG. 3, the mesh-like pores 29 are drawn large for convenience. The same applies to FIGS. 6 and 7 described below.

  The first half 31 (a member disposed on the lower side in FIG. 5) includes a first half body portion 32 which is formed in a semicircular cross-sectional shape and has mesh-shaped pores 29. An annular part 35 constituting the opening 27 is formed at one end of the body main part 32, and an annular bulge having an outer diameter larger than the outer diameter of the annular part 35 is formed around the outer side of the annular part 35. A portion 23 is formed, and a semicircular arc portion 37 having an outer diameter smaller than the outer diameter of the annular portion 35 is integrally and continuously formed around the inner side.

  On the other hand, the second half 33 (a member disposed on the upper side in FIG. 5) is also formed in a semicircular cross-sectional shape and includes a second half body 34 having mesh-like pores 29, and the second half A contact frame 39 having a semicircular cross section is formed at one end of the body main body 34.

  A flange 19 is formed on the outer periphery of the abutting portion of the first half 31 and the second half 33 over the entire circumference, and each of the first half 31 and the second half 33 is provided. Reinforcing ribs 41 are integrally projected on the outer surfaces of the main body portions 32 and 34 in the vertical and horizontal directions.

  As shown in FIG. 6A, a recess 43 is formed over the entire circumference of the butted portion of the first half 31, while the butted portion of the second half 33 is formed in the butted portion of FIG. As shown in FIG. 4, a convex portion 45 that fits with the concave portion 43 is formed over the entire circumference. In a state where the butted portion of the first half 31 and the butted portion of the second half 33 are butted, these butted portions are positioned symmetrically with respect to the center line of the opening 27 on the outer peripheral surface of the filter 5. (See FIG. 3).

  In the first half 31 and the second half 33, the distance A between the side surfaces of the opposing concave portion 43 of the first half 31 is the distance between the outer surfaces of the convex portions 45 of the second half 33 facing each other. B is slightly shorter than B.

  The first half body 31 and the second half body 33 configured as described above are assembled to the first half body 31 by bending the second half body 33 inward. Specifically, the inner peripheral surface of the contact frame 39 of the second half 33 is brought into contact with the outer peripheral surface of the semicircular arc portion 37 of the first half 31, and the recess 43 of the abutting portion of the first half 31. And the convex portion 45 of the butted portion of the second half 33 are fitted to each other so that the butted portions are butted against each other to form the filter 5. The filter 5 is inserted into the oil supply port 9 side of the oil strainer body 3, and the flange 19 of the filter 5 is engaged with the engagement portion 21 formed on the inner peripheral surface 3a of the oil strainer body 3, The oil strainer 1 is attached to the internal combustion engine 13 with the bulging portion 23 supported by the step portion 25 of the oil strainer body 3, and the bulging portion 23 of the filter 5 is sandwiched between the oil strainer body 3 and the internal combustion engine 13. Has been. At this time, an O-ring 47 (see FIGS. 1 and 2) is interposed in the bulging portion 23 of the filter 5.

  As described above, each flange 19 is engaged with the engaging portion 21 of the oil strainer body 3 in a state where the butted portions of the first half 31 and the second half 33 are butted against each other, and the butted portions are not separated. The filter 5 is stably held in the oil strainer body 3. Thus, the holding means is constituted by the concave portion 43 of the butted portion of the first half 31, the convex portion 45 of the butted portion of the second half 33, the flange 19 of the filter 5, and the engaging portion 21 of the oil strainer body 3. It is configured.

  Therefore, the flange 19 projecting from the first half 31 and the second half 33 is engaged with the engaging portion 21 formed on the inner peripheral surface 3a of the oil strainer body 3, so that the first half It is possible to hold the filter 5 in the oil passage 17 more stably by restricting movement of the butted portions of 31 and the second half 33 in the direction away from each other.

  The holding means is configured by omitting the engaging portion 21 of the inner peripheral surface 3 a of the oil strainer body 3 and bringing the tip (butting portion) of the flange 19 into contact with the inner peripheral surface 3 a of the oil strainer body 3. Also good. Even in this case, since the flange 19 is in contact with the inner peripheral surface 3 a of the oil strainer body 3, the movement of the filter 5 in the oil passage 17 is restricted and the filter 5 is stably held in the oil passage 17. be able to.

  In order to mold the first half 31 and the second half 33, as shown in FIG. 7, a first die 49 for molding the outer peripheral surfaces of the first half 31 and the second half 33, and a second A molding die 55 comprising a second die 53 formed with a projection 51 for shaping the inner peripheral surface of the half 33 and penetrating and forming a large number of mesh-like pores 29 in the die opening direction is prepared. The abutting portions of the first half body 31 and the second half body 33 are positioned on the parting surface 56 of the molding die 55. The mold 55 is closed and molten resin is injected into a cavity (not shown). 7 shows only the second half 33 side of the mold 55, the first half 31 side of the mold 55 is not shown, but has a similar mold structure. Further, the protrusion 51 that forms the mesh-like pore 29 is also drawn for convenience in accordance with the mesh-like pore 29.

  In the molding die 55, the first half 31 and the second half 33 are arranged so that the cavities face each other, and molten resin is injected from the gate into the cavity. FIG. 8 shows the first half 31 and the second half 33 formed in this way. In the figure, 57 is a gate for injecting molten resin, and 59 is a resin solid material in which the resin injected from the gate 57 into the cavities of the first half 31 and the second half 33 is solidified in the passage. Further, the cavities of the first half 31 and the second half 33 may be arranged side by side in parallel.

  Therefore, according to the first embodiment, the resin first half body 31 and the second half body 33 in which a large number of mesh-shaped pores 29 are formed are formed in a halved shape and abutted with each other to form the cylindrical filter 5. Therefore, as in Patent Document 1, it is possible to prevent the resin from flowing into the mesh-shaped pores and forming burrs. When inspecting the formation state of the mesh-shaped pores 29, the state before the butted portions of the first half 31 and the second half 33 are brought into contact with each other, that is, the first half 31 and the first half 31 The inspection can be performed from one direction in the state of the two-half body 33, and the product inspection can be easily performed. Further, the abutment portions of the first half body 31 and the second half body 33 are holding means so as not to be separated from each other. Since it is held by the portion 45, the flange 19 of the filter 5, and the engaging portion 21 of the oil strainer main body 3, work such as heat welding is unnecessary, and the manufacturing process can be simplified.

  In addition, since the concave portions 43 and the convex portions 45 are fitted to the butted portions of the first half 31 and the second half 33, the holding state of the butted portions is improved so that the butted portions are not separated from each other and oil is transferred from the butted portions to the oil. It is possible to restrict intrusion of mixed foreign matters.

  Further, an annular portion 35 having an opening 27 is formed in one of the first half 31 and the second half 33, and a semicircular arc portion 37 is continuously formed on the annular portion 35, and the semicircular arc is formed. Since the inner peripheral surface of the contact frame portion 39 of the second half 33 is in contact with the outer peripheral surface of the portion 37, the sealing performance around the opening 27 of the filter 5 made of a halved butted body is improved. Can do.

  When the oil strainer 1 is attached to the internal combustion engine 13, the filter 5 is sandwiched between the oil strainer body 3 and the internal combustion engine 13, so that the filter is attached to the oil strainer body as in the locking claw and the engagement hole of Patent Document 1. It is not necessary to separately provide a means for attaching to the housing, and a simple structure can be obtained, and the labor of attachment work is not required.

(Embodiment 2)
FIG. 9 shows an oil strainer 1 according to Embodiment 2 of the present invention, and FIG. 10 shows a mold 55 for the second half 33 of the filter 5 of Embodiment 2. The filter 5 has a quadrangular cross section, and the first half 31 and the second half 33 are formed such that each butt portion is located on the parting surface 56 of the mold 55, and the butt. The opposing surface 67 having one end as an end is inclined with respect to the mold opening direction so as to be separated from each other as the abutting portion is approached, and a large number of mesh-shaped pores 29 penetrate the opposing surface 67 in the mold opening direction. Is formed. Further, the flange 19 is not formed at the abutting portion of the filter 5, while the engaging portion 21 is not formed on the inner peripheral surface 3 a of the oil strainer main body 3, and the tip of the abutting portion is placed inside the oil strainer main body 3 It is made to contact | abut to the surrounding surface 3a. Since other than that is comprised similarly to the said Embodiment 1, the same code | symbol is attached | subjected to the same structure location and the description is abbreviate | omitted.

  Therefore, according to the second embodiment, when the formation of the mesh-shaped pores 29 of the filter 5 is inspected by image processing using a camera by making the filter square, each surface is a flat surface with the camera. Can be inspected while maintaining a constant distance from each other, so that the focus can be easily adjusted, and the focus can be easily set and the inspection accuracy can be improved as compared with the case where the inspection is performed by focusing on a curved surface. Further, since the mesh-like pores 29 are formed so as to penetrate in the mold opening direction, the mesh-like pores 29 are formed simultaneously with the molding of the first half body 31 and the second half body 33 without using a slide mold. Therefore, workability can be improved with a simple mold structure.

  In the second embodiment, the filter 5 is formed in a quadrangular cross section, but the present invention is not limited to this. For example, when the cross section is hexagonal, the area of the filter 5 can be increased from that of the cross section having a quadrangular shape. Thereby, the filter 5 can be designed to be compact.

  In the second embodiment, a slide mold is not used, but it may be used. At this time, although the mold becomes a little complicated by using the slide mold, the depth of the mesh-shaped pore 29 is made the same throughout the entire circumference, and the resistance of the oil passing through the mesh-shaped pore 29 is reduced. Can be unified.

  The present invention is useful for an oil strainer used for supplying oil to an internal combustion engine of a vehicle.

It is a perspective view of the oil strainer which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view of the oil strainer which concerns on Embodiment 1 of this invention. It is sectional drawing in the III-III line of FIG. It is a perspective view of the filter of the oil strainer which concerns on Embodiment 1 of this invention. It is the perspective view which decomposed | disassembled the filter of the oil strainer which concerns on Embodiment 1 of this invention into the 1st half body and the 2nd half body. (A) is a cross-sectional view of the first half, and (b) is a cross-sectional view of the second half. It is sectional drawing by the side of the 2nd half body of the shaping | molding die in Embodiment 1 of this invention. It is a top view of the 1st half body and the 2nd half body immediately after removing from a shaping | molding die. FIG. 3 is a view corresponding to FIG. 3 according to Embodiment 2 of the present invention. FIG. 9 is a view corresponding to FIG. 7 according to Embodiment 2 of the present invention.

Explanation of symbols

1 Oil strainer
3 Oil strainer body
3a inner wall
5 Filter
7 Oil inlet
9 Oil supply port
13 Internal combustion engine
17 Oil passage
19 Flange (holding means)
21 engaging part (holding means)
23 bulge
25 steps
27 opening
29 mesh pores
31 1st half
33 Second half
35 torus
37 Semicircular arc part
39 Contact frame
43 Concavity (holding means)
45 Convex (holding means)
55 Mold

Claims (6)

An oil strainer body having an oil inlet at one end and an oil supply port at the other end and having an oil passage formed therein;
A cylindrical filter that is disposed in the oil passage of the oil strainer body, has an opening at one end, and has a large number of mesh-shaped pores formed on the entire outer periphery;
An oil strainer that causes oil stored in an oil pan to flow into the oil passage from the oil inlet and supply the internal combustion engine through an oil supply port,
The filter is formed by dividing the first half and the second half of the half-shaped resin, each of which is formed so as to be divided into two along the center line of the opening, and in which a large number of mesh-shaped pores are formed. An oil strainer characterized in that the first half body and the second half body are held by holding means so as not to be separated from each other. The oil strainer according to claim 1,
The holding means includes a concave portion formed in one of the butted portions of the first half and the second half, and a convex portion formed on the other and fitted to the concave portion,
An oil strainer characterized in that a point-symmetrical position with respect to the center line of the opening on the outer peripheral surface of the filter is in contact with the inner peripheral surface of the oil strainer body. In the oil strainer according to claim 1 or 2,
The first half and the second half are each formed in a semicircular cross-sectional shape, and an annular portion having an opening is formed in one of the first half and the second half, and the annular A semicircular arc portion having an outer diameter smaller than the outer diameter of the annular portion is continuously formed in the portion, and the inner peripheral surface of the other half body is in contact with the outer peripheral surface of the semicircular arc portion. A featured oil strainer. In the oil strainer according to claim 1 or 2,
The filter has a polygonal cross-sectional shape, and the first half and the second half are molded such that each butted portion is located on the parting surface of the mold, and the butted portion is one end. The opposing surface is inclined with respect to the mold opening direction so as to be separated from each other as it approaches the abutting portion, and a large number of mesh-shaped pores are formed through the opposing surface in the mold opening direction. Oil strainer to do. The oil strainer according to any one of claims 1 to 4,
A flange is formed outwardly on the outer periphery of the abutting portion of the first half and the second half, and the abutting portion of the first half and the second half is formed on the inner peripheral surface of the oil strainer body. An engagement portion is formed in which each flange engages with each other in a state of being abutted against each other.
An oil strainer, wherein the flange and the engaging portion also constitute a holding means. The oil strainer according to any one of claims 1 to 5,
A bulging portion is formed at the opening end of the filter, and a step portion for supporting the bulging portion of the filter is formed on the inner peripheral surface of the oil supply port of the oil strainer body, and the oil strainer body is attached to the internal combustion engine. An oil strainer characterized in that the bulging portion of the filter is sandwiched between the oil strainer body and the internal combustion engine.

Images