KR20110025059A - Method for producing oil strainer - Google Patents

Abstract

PURPOSE: An oil strainer is provided to economically produce a molding frame by forming a main body unit and a filtering unit with the same molding frame, and by removing a mounting process. CONSTITUTION: An oil strainer comprises the following: a concave unit(17b) including a protrusion row(23) to form plural vertical grooves(35) on the entire inner circumference of a first frame(17); a first slide frame(27) dividing the concave unit into plural divisions; a second slide frame(29) including another protrusion row(31) for forming plural horizontal grooves(37) on the outer circumference facing the inner circumference; and a cavity(33) filled with a molten resin, after inserting the first and second slide frames into the concave unit.

Description

Process for producing oil strainer {METHOD FOR PRODUCING OIL STRAINER}

The present invention includes a cylindrical resin body portion and a resin filtration portion provided inside the body portion, wherein the oil strainer filters the oil by the filtration portion in the process of passing oil inside the body portion from one end side to the other end side. It relates to a manufacturing method.

Patent Literature 1 discloses a resin oil strainer in which a first housing is integrally expanded to one end of a cylindrical oil strainer main body, and a second housing having a plate-shaped filter mounted therein is mounted to the first housing via a hinge. Is disclosed.

Patent Literature 2 discloses a resin oil strainer in which a connecting portion is formed in a bag-shaped filter having one end open, and the connecting portion is engaged with an inner surface of a cylindrical oil strainer main body to mount the filter on the oil strainer main body. have.

Japanese Patent Laid-Open No. 2002-153712 Japanese Patent Laid-Open No. 2001-120920

However, in the said patent document 2, since an oil strainer main body and a filter are comprised by separate members and each must be shape | molded by the exclusive shaping | molding die, manufacturing cost is high. In addition, Patent Literatures 1 and 2 require mounting operations of the oil strainer main body and the filter, thereby increasing the manufacturing cost.

Moreover, in the said patent document 1, since a filter is formed in a plate shape and covers the opening of an oil strainer main body, and is small, it is not possible to ensure the filtration area of oil widely.

Moreover, in the said patent document 1, when a clearance gap arises in a hinge part because of a molding error, a mounting error, etc. of both housings, there exists a possibility that oil may flow in from this clearance and the filtration function may fall. In addition, in Patent Document 2, if a gap is formed between the filter and the inner surface of the oil strainer main body due to a molding error of the filter and the oil strainer main body, oil may enter and exit the gap and the filtration function may be deteriorated.

This invention is made | formed in view of such a point, Comprising: It is providing the oil strainer which secured a wide filtration area and high filtration function at low cost.

In order to achieve the above object, the present invention is characterized by manufacturing an oil strainer in which the cylindrical body portion and the bag-shaped filtration unit are integrated.

Specifically, the present invention relates to a cylindrical resin main body having both ends opened, and a cylindrical shape having a bottom so that the cross section is not narrower than the opposite opening end side from the opening end side to the opposite opening end side from the opening end side. It is provided with a shell-shaped pendulum shape of which one end is opened, and is provided with a resin filtration part which is integrally connected to the main body part around the opening end so as to divide the inside of the main body part into one end side and the other end side. The manufacturing method of the oil strainer which filters an oil by the filter part in the process of passing the inside of the said main-body part from the one end side to the other end side is made into object, The following solution means is calculated | required.

That is, 1st invention is provided with the 1st frame and a 2nd frame which shape | mold the inner side surface and the outer side surface of the said main body part, and the outer side surface of the filtration part, and the slide frame which shapes the inner side surface of the said filtration part, The said 1st frame And a concave portion having one row of protrusions for forming a plurality of rows of longitudinal grooves in a circumferential direction on one side of the second frame, and the slide frame is disposed in the concave portion so as to be retractable. A first slide frame for dividing the inside of the part into a plurality of divided spaces in the circumferential direction, and an outer circumferential surface that is disposed in the respective divided spaces so as to move forward and backward in a direction intersecting with the advance direction, and which faces the inner peripheral surface of the recess; Preparing a molding die composed of a second slide mold having a row of protrusions for forming a plurality of rows of horizontal grooves at a predetermined pitch in the advancing direction; In the closed state in which the first slide frame and the second slide frame are advanced into the recess, the molten resin is filled in the cavity so that no gap is formed at the intersection of the both rows of protrusions, and the molten resin is solidified. The first slide frame is retracted from within the recess, and then the second slide frame is moved toward the center of the recess to move the projection row away from the row of projections of the recess and then to retract from the recess. A plurality of rows of longitudinal grooves are formed in the entire concave portion by the projection rows, and a plurality of rows of the horizontal grooves are formed in an annular shape by the projection rows of the second slide frame, and the horizontal grooves and the vertical grooves overlap each other. Through holes penetrating in the wall thickness direction are formed in a plurality of sites, and these penetrates the entire circumferential wall of the filtration unit. It is characterized by obtaining an oil strainer in which holes are distributed in a mesh shape.

According to a second aspect of the present invention, in the method for producing the oil strainer of the first aspect, the concave portion has a bottom surface on which a plurality of projections for forming a small hole protrude substantially vertically, and the bottom wall portion of the oil strainer to be formed is formed on the projection. A plurality of corresponding small holes are formed through.

According to the first invention, since the main body portion and the filtration portion can be molded by a common molding die, the mold cost can be reduced as compared with the case where each molding die is used. In addition, since the mounting process becomes unnecessary and the number of manufacturing processes becomes small, manufacturing cost can be reduced.

In addition, since the main body portion and the filtration portion are successively formed and integrally formed, no mounting error occurs when the separate members are mounted, and there is no fear that a gap occurs in the mounting portion. Therefore, oil does not flow in and out from a mounting site | part, and a filtration function improves.

Moreover, since the filtration part is formed in bag shape, compared with the case where it forms in plate shape like patent document 1, the filtration area of oil can be ensured widely.

According to the second aspect of the invention, since the oil is also filtered through the bottom wall portion, the filtration area is larger than that in the case where no hole is formed in the bottom wall portion, whereby the suction resistance can be reduced.

1 is a front view of an oil strainer manufactured by the manufacturing method according to the first embodiment of the present invention,
2 is a cross-sectional view taken along the line AA of FIG.
3 is an enlarged view of the outer wall of the circumferential wall of the filtration unit in the oil strainer manufactured by the manufacturing method according to the first embodiment of the present invention;
4 is an enlarged view of the inner wall of the circumferential wall of the filtration unit in the oil strainer manufactured by the manufacturing method according to the first embodiment of the present invention;
5 is a plan view of an oil strainer manufactured by a manufacturing method according to a first embodiment of the present invention;
6 is a cross-sectional view taken along line BB of FIG.
Fig. 7 corresponds to Fig. 6, wherein (a) is a state in which the first slide frame and the second slide frame are advanced into the recesses of the columnar protrusions of the first frame, and (b) is the first slide frame of the first frame. (C) is a manufacturing process chart which shows the state which moved the 2nd slide frame to the center direction of the columnar protrusion recess of the 1st frame,
(A) is sectional drawing corresponding to the CC line of FIG. 7 (a), (b) is sectional drawing corresponding to the DD line of FIG. 7 (b), (c) is (c) of FIG. Cross section corresponding to EE line,
9 is an exploded perspective view of an oil strainer manufactured by a manufacturing method according to a second embodiment of the present invention;
10 is a perspective view of an oil strainer manufactured by the manufacturing method according to the second embodiment of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described based on drawing.

(First embodiment)

1 to 6 show an oil strainer 1 manufactured by the manufacturing method according to the first embodiment of the present invention. The oil strainer 1 includes an elliptic cylindrical resin main body 3, one end of which is opened in the main body 3 and a bottom filter 41 having the bottom wall 41 on the other end. Is provided, and this filtration part 5 is formed in the bottomed elliptic cylinder shape whose diameter becomes a long side toward an opening end side. This filtration part 5 divides the inside of the main body part 3 into the upper end side (oil flow direction downstream side) and the lower end side (oil flow direction upstream side), and the opening end is upstream of the oil flow direction rather than the opposite opening end. Continuously connected to the lower edge of the main body 3 around the opening end so as to be located at the side. Except for the region where the first slide frame 27 and the inner circumferential surface contact each other, a plurality of rows of vertical grooves 35 are formed on the entire outer circumferential surface of the filtration unit 5, and a plurality of horizontal grooves 37 on the entire inner circumferential surface. It is formed in an annular shape, and a through hole 39 penetrating in the wall thickness direction is formed in a plurality of portions where the vertical grooves 35 and the horizontal grooves 37 overlap, and the main wall portion 6 of the filtration unit 5 is formed. ) Is distributed throughout the mesh. Further, in the bottom wall portion 41, a plurality of small holes 43 are formed in a mesh form in a region other than the nearly cross-shaped region where the first slide frame 27 and the inner surface of the first slide frame 27 described later are in contact with each other.

On the outer periphery of the upper end side of the main body 3, the plate-shaped swelling piece 7 is expanded in the radially outward direction over the entire circumference and formed integrally. The expansion piece 7 is provided with a pair of bolt insertion holes 9 penetrating in the plate thickness direction so as to be located 180 degrees apart from each other with the longitudinal axis of the opening of the main body 3 interposed therebetween. A metal collar 11 is fitted into each bolt insertion hole 9. In addition, an elliptical annular groove 13 is formed on the upper end surface of the main body portion 3 over its entire circumference, and the sealing O-ring 15 made of rubber is fitted into the annular groove 13. In addition, the lower edge of the main body portion 3 is formed to be inclined upward toward one side of the short axis direction.

7 and 8 show a manufacturing process of the oil strainer 1 according to the first embodiment of the present invention. In order to manufacture the oil strainer 1 configured as described above, the inner surface of the body portion 3, the outer surface of the filtration section 5, the upper surface of the swelling piece 7, and the bolt insertion hole 9 A first mold 17 (fixing mold) for molding the inner circumferential surface, an outer surface of the main body portion 3, and a second mold 19 (moving mold) for molding the lower surface and the side surface of the expansion piece 7; The shaping | molding die 22 comprised from the slide shaping | molding 21 which shape | molds the inner surface of the said filtration part 5 is used. Before demonstrating a specific manufacturing method, the frame structure of this shaping | molding die 22 is demonstrated.

The first mold 17 has a columnar protrusion 17a for shaping the inner surface of the main body portion 3, and a recessed portion 17b is formed at the tip end surface of the columnar protrusion 17a. This recessed part 17b is formed in an elliptical cross section so that the diameter gradually shortens from the opening side to the bottom side. On the whole inner peripheral surface of this recessed part 17b except the area | region which opposes the 1st slide frame 27 mentioned later, the processus | protrusion row 23 for forming a plurality of longitudinal groove | channel 35 has a predetermined pitch in the circumferential direction. And a plurality of projections 25 for forming the holes 43 in the area except the substantially cross-shaped area facing the first slide frame 27 described later on the bottom surface of the concave portion 17b. ) Is formed to protrude almost vertically. Further, on the rear end side of the columnar protrusion 17a of the first mold 17, an annular protrusion 18 for forming the annular groove 13 is formed so as to surround the columnar protrusion 17a. In addition, a pair of protrusions 20 for forming the bolt insertion hole 9 are formed in the first mold 17, and the columnar protrusions 17a are disposed between the pair of protrusions 20 facing each other. Located in

On the other hand, the second frame 19 has a concave portion 19a for forming the lower surface and the side surfaces of the main body portion 3 and the swelling piece portion 7, and the slide on the bottom surface of the concave portion 19a. An insertion hole 19b through which the mold 21 is inserted is formed.

In addition, the slide frame 21 is composed of a first slide frame 27 and four second slide frame 29, the slide frame 21 in the state inserted into the insertion hole (19b) of the second frame (19). It is arrange | positioned so that advance and retreat into the recessed part 17b of the 1st frame 17 is possible. The first slide frame 27 is formed in a substantially cross-shaped columnar cross section, and is disposed in the recess 17b so as to be divided into four divided spaces in the recess 17b of the first frame 17. do. The second slide frame 29 is formed in a columnar shape having a cross-sectional shape in which an ellipse is divided into four major and minor axes, respectively, and is arranged to be movable in the respective divided spaces and to move in a direction intersecting with the direction of advancing. do. On the outer circumferential surface of the second slide frame 29 that faces the inner circumferential surface of the concave portion 17b, a projection row 31 for forming a plurality of rows of horizontal grooves 37 is formed at a predetermined pitch in the advancing direction at a predetermined pitch. Formed over.

Next, the manufacturing method of the oil strainer 1 which concerns on this embodiment is demonstrated.

First, the second mold 19 is advanced and the first mold 17 is approached to insert the columnar protrusion 17a of the first mold 17 into the recessed portion 19a of the second mold 19. Let's do it. In addition, by moving the first slide frame 27 and the second slide frame 29 from the insertion hole 19b of the second frame 19 into the recess 17b of the first frame 17, 22 is closed to form the cavity 33. In this state, as shown in Figs. 7A and 8A, the projection rows 23 and the second slide molds 29 of the recesses 17b of the first mold 17 are formed. A gap does not appear in the intersection with the projection row 31, and the projection 25 of the concave portion 17b comes in contact with the end surface in the advancing direction of the second slide frame 29. In the cavity 33 thus formed, molten resin (not shown) is filled from the space formed between the tip of the first slide frame 27 and the inner circumferential surface of the recess 17b of the first frame 17. At this time, since the projection rows 23 and the projections 25 are not formed in the inner circumferential surface and the bottom surface of the concave portion 17b in the region facing the first slide frame 27, the cavity of the main body portion 3 It becomes a passage of the connected molten resin, and the molten resin smoothly fills the entire cavity space corresponding to the filtration unit 5 evenly.

Next, after the filled molten resin solidifies, as shown in FIG.7 (b) and FIG.8 (b), the said 1st slide frame 27 is retracted from inside the said recessed part 17b. Subsequently, as shown in FIGS. 7C and 8C, the second slide frame 29 is moved in the center direction of the recessed portion 17b to move the protrusion row 31 to the recessed portion ( After spaced apart from the protruding rows 23 of 17b, it is retracted from within the recess 17b.

The second mold 19 is then retracted and the molding mold 22 is opened away from the first mold 17 to demold the shaped oil strainer 1. As shown in FIGS. 2-6, the vertical groove | channel 35 of several rows is shown in the whole outer peripheral surface except the area | region which the 1st slide frame 27 and the inner peripheral surface of the filtration part 5 of the oil strainer 1 obtained in this way contact. In addition to being formed by the projection rows 23 of the recesses 17b, a plurality of rows of horizontal grooves 37 are formed in an annular shape by the projection rows 31 of the second slide frame 29 over the entire inner circumferential surface thereof. The through hole 39 penetrating in the wall thickness direction is formed in a plurality of portions where the vertical grooves 35 and the horizontal grooves 37 overlap, and the first slide frame 27 and the inner circumferential surface of the filtration unit 5 are formed. The entire circumferential wall 6 is distributed in a mesh form except for the area in contact. In addition, in the region of the bottom wall portion 41 except for the nearly cross-shaped region where the first slide frame 27 and the inner surface contact each other, a plurality of holes 43 corresponding to the protrusions 25 are formed through the mesh. The part which contacts the 1st slide frame 27 of the said filtration part 5, and the through-hole 39 and the small hole 43 is not formed is a beam which supports the said filtration part 5, The filtration part 5 Maintain rigidity of).

The oil strainer 1 manufactured as described above is accommodated in an oil pan, and the oil intake port of the engine is tightened by bolts while the metal collar 11 is inserted into both bolt insertion holes 9 of the bulging piece 7. (Not shown). In this state, the O-ring 15 is pressed against the bottom surface of the annular groove 13 and the periphery of the oil suction port, thereby preventing oil or air from entering. And when the engine is driven in this state, oil in the oil pan is sucked from the lower end opening of the body portion 3 and filtered through the through hole 39 or the small hole 43 of the filtration part 5, It flows out of the upper side and passes through the oil pump to the engine sliding part.

Therefore, according to this embodiment, since the main body part 3 and the filtration part 5 can be shape | molded by the common shaping | molding die 22, mold cost can be reduced compared with the case where each shaping | molding die is used. In addition, since the mounting process becomes unnecessary and the number of manufacturing processes becomes small, manufacturing cost can be reduced.

Moreover, since the main body part 3 and the filtration part 5 are integrally formed and integrally formed, the mounting error at the time of mounting a separate member does not arise and there is no possibility that a clearance may arise in a mounting site | part. Therefore, oil does not flow in and out from a mounting site | part, and a filtration function improves.

Moreover, since the filtration part 5 is formed in bag shape, compared with the case where it is formed in plate shape, the filtration area of oil can be ensured widely.

In addition, since the oil is also filtered through the bottom wall portion 41, the filtration area becomes larger than when the small hole 43 is not formed in the bottom wall portion 41, whereby the suction resistance can be made small.

(Second embodiment)

9 and 10 show an oil strainer 1 manufactured by the manufacturing method according to the second embodiment of the present invention. The oil strainer 1 is constructed by joining the first conduit 45 and the second conduit 47 to each other. Since the first conduit 45 has a main body portion 3 and a filtration portion 5, and has the same shape as the oil strainer 1 produced by the manufacturing method according to the first embodiment, the same constitution The same reference numerals are used and the description is omitted. However, the lower edge of the main body portion 3 of the first conduit 45 is not inclined, and the lower end of the main body portion 3 extends along the lower edge and faces a pair of arc-shaped flange portions 49 facing each other. ) Is expanded in the radially outward direction to form a single body.

On the other hand, the second conduit 47 has a tubular body portion 51 curved in a substantially " <&quot; shape, and a plate-like flange portion 53 is almost formed at the upper edge of the tubular body portion 51. It swells in the radially outward direction over its perimeter and is formed integrally. On the upper surface of the flange portion 53, a pair of arc-shaped protrusions 55 along the outer circumference protrude so as to correspond to the gap of the flange portion 49 of the first conduit 45. In addition, in the radially inner side of the protruding portion 55 of the flange portion 49, a cylindrical insertion portion 57 which is fitted from the inner side to the main body portion 3 of the first conduit 45 is protruded. In addition, a pair of semi-circular cutouts 59 are formed on the lower edge of the main body portion 51 of the second conduit 47 at opposite sides of 180 degrees, and the bottom surface of the oil pan is the main body of the second conduit 47. The opening of the lower end side of the part 51 is prevented.

In order to manufacture this oil strainer 1, first, the first conduit 45 and the second conduit 47 are prepared. The first conduit 45 is manufactured by the same method as the manufacturing method of the oil strainer 1 according to the first embodiment. However, the recessed part for forming the said flange part 49 is formed in the inner surface of the recessed part 19a of the 2nd frame 19 used for manufacture.

And as shown in FIG. 10, the cylindrical insertion part 57 of the 2nd conduit 47 is inserted into the lower end opening of the main-body part 3 of the 1st conduit 45, and the 2nd conduit 47 is carried out. The protrusion 55 of the first conduit 45 is fitted into the gap of the flange 49 of the first conduit 45, and the first conduit 45 and the second conduit 47 are welded to each other in this state.

Here, in the first and second embodiments, the main body 3 is formed in a cylindrical shape, but may be formed in a cylindrical shape having a cross section other than a circular shape such as a square.

In addition, in the said 1st, 2nd Example, although the filtration part 5 was formed in the bottomed elliptic cylinder shape whose diameter gradually becomes long toward an opening edge part, you may form in the cylindrical shape which has cross sections other than ellipses, such as a square. In addition, as long as the cross-sectional area is not narrower than the opposite opening end side from the opening end side to the opposite opening end side, it may be formed in another cylinder shape, such as a hammer shape with one end opened, or a cylinder with a constant diameter.

In addition, in the said 1st, 2nd Example, although the opening edge part of the filtration part 5 is located in the oil flow direction upstream rather than the opposite opening end, you may be located in the oil flow direction downstream. In this case, the shaping | molding die 22 becomes a shaping | molding structure in which the 2nd shaping | molding 19 shape | molds at least the inner side surface of the main-body part 3, and the outer side surface of the filtration part 5.

In addition, in the first and second embodiments, the first slide frame 27 is formed in a substantially cross-shaped columnar cross section, and the second slide frame 29 is formed in a cross-sectional shape obtained by dividing an ellipse into four long and short axes. It has a columnar shape. However, by retracting the first slide frame 27, the second slide frame 29 is moved toward the center of the recess 17b, and the protrusion rows 31 are moved to the protrusion rows 23 of the recess 17b. The first slide frame 27 and the second slide frame 29 may be of different shapes as far as possible to be separated from the recess 17b.

And this invention is equipped with the cylindrical resin main-body part and the resin filtration part provided in this main-body part, for example, and filter by the filtration part in the process of passing oil inside the main-body part from one end side to the other end side. It is useful as a manufacturing method of the oil strainer.

1 oil strainer 3 body part
5 filtration part 6 circumferential wall part
17: first frame 17b: concave portion
19: second frame 21: slide frame
22: forming mold 23, 25, 31: protrusion row
27: first slide frame 29: second slide frame
33: cavity 35: vertical groove
37: horizontal groove 39: through hole
41: bottom wall 43: a small hole

Claims (2)

A cylindrical resin body part having both ends opened, and a shell having a bottom or a cylindrical shape having one end opened so that the cross-sectional area is not narrower than the opposite opening end side from the opening end side to the opposite opening end side from the opening end side. It is formed in the shape of a weight and provided with a resin filtration part which is integrally connected to the main body part around the opening end part so as to divide the inside of the main body part into one end side and the other end side, and the oil, the inside of the main body part at one end side. In the manufacturing method of the oil strainer which filters by a filtration part in the process of passing to the other end side,
A first mold and a second mold for forming the inner side and the outer face of the main body portion and an outer side of the filter portion, and a slide mold for forming the inner side of the filter portion, wherein one side of the first and second molds is provided. And a concave portion having protrusion rows for forming a plurality of rows of longitudinal grooves at a predetermined pitch in the circumferential direction over the entire inner circumferential surface, and the slide frame is arranged to be retractable in the concave portion, A first slide frame for dividing into dividing spaces and a plurality of rows of horizontal grooves formed on each of the dividing spaces so as to move forward and backward in a direction intersecting with the advancement direction and on an outer peripheral surface facing the inner peripheral surface of the concave portion; To prepare a molding die composed of a second slide die having a row of protrusions for a predetermined pitch in the advancing direction;
In the closed state in which the first slide frame and the second slide frame are advanced into the concave portion, the molten resin is filled in the cavity so that a gap does not occur at the intersection of the both rows of protrusions, and after the molten resin is solidified, The first slide frame is retracted from within the recess, and then the second slide frame is moved toward the center of the recess to separate the row of protrusions from the row of protrusions of the recess, and then retracted from within the recess and filtered. A plurality of rows of longitudinal grooves are formed in the entire outer peripheral surface of the recess by the row of protrusions, and a plurality of rows of horizontal grooves are formed in an annular shape by the rows of projections of the second slide frame in the entire inner peripheral surface. Through holes penetrating in the wall thickness direction are formed at a plurality of overlapping portions, and the entire main wall portion of the filtration portion is formed. Characterized in that the through holes obtain a distribution of the oil strainer onto the mesh
Method of making an oil strainer. The method of claim 1,
The recess has a bottom surface in which a plurality of protrusions for forming a small hole protrude substantially vertically,
The bottom wall portion of the oil strainer to be molded is characterized in that a plurality of small holes corresponding to the protrusion is formed through
Method of making an oil strainer.

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