JP5368914B2 - Oil strainer manufacturing method - Google Patents

Abstract

The present invention discloses a method for producing an oil stainer. A first mold (17) is provided with a dent part (17b) which is provided with projection strips (23) for forming a plurality of longitudinal grooves (35). At a mold closing state that first molding sliders (27) which divides the dent part (17b) to a plurality of dividing spaces and second molding sliders (29) that are provided with projection strips (31) for forming a plurality of transverse grooves (37) advance into the dent part (17b), the melted resin is filled into a mold chamber (33) with a state that no clearance is generated at a crossing part of two projection strips (23,31). After the melted resin is solidified, the first molding sliders (27) retreat from the dent part (17b), the second molding sliders move along a central direction of the dent part (17b). The projection strips (31) retreat from the dent part (17b) after released from the projection strips (23) of the dent part (17b).

Description

  The present invention includes a cylindrical resin main body portion and a resin filter portion disposed inside the main body portion, and the oil is filtered in a process of passing the inside of the main body portion from one end side to the other end side. It is related with the manufacturing method of the oil strainer filtered by a part.

  In Patent Document 1, a first housing is integrally formed at one end of a cylindrical oil strainer body, and a second housing in which a plate-like filter is formed is assembled to the first housing via a hinge. A resin oil strainer is disclosed.

  In Patent Document 2, an engagement portion is provided in a bag-shaped filter having an open end, and the engagement portion is engaged with the inner surface of the cylindrical oil strainer body, whereby the filter is assembled to the oil strainer body. A resin oil strainer is disclosed.

JP 2002-153712 A JP 2001-120920 A

  However, in Patent Document 2, since the oil strainer body and the filter are configured as separate members, each must be molded with a dedicated mold, which increases the manufacturing cost. Moreover, in patent documents 1, 2, the assembly | attachment operation | work of an oil strainer main body and a filter is required, and the manufacturing cost is also high by this.

  Moreover, in Patent Document 1, since the filter is plate-like and is provided so as to cover the opening of the oil strainer main body, a large oil filtration area cannot be secured.

  Furthermore, in Patent Document 1, if a gap occurs in the hinge portion due to molding errors or assembly errors of both housings, there is a risk that oil enters and exits from this gap and the filtration function is reduced. Also in Patent Document 2, if a gap is formed between the filter and the oil strainer body inner surface due to molding errors of the filter and the oil strainer body, the oil may enter and exit from the gap and the filtration function may be reduced.

  This invention is made | formed in view of this point, and is providing the oil strainer by which the wide filtration area and the high filtration function were ensured at low cost.

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

  Specifically, the present invention provides a cylindrical resin main body having both ends opened, and the inside of the main body, and the cross-sectional area extends from the opening end to the non-opening end. It is formed in a cylindrical shape with a bottom so that it is not narrower than the end side or a shell-shaped cone shape with one end opened, and the inside of the main body is opened so as to be divided into one end side and the other end side. A method for producing an oil strainer comprising a resin filtration part that is integrally continuous with a main body part at a peripheral edge of the end part, and filtering the oil through the filtration part in a process of passing the inside of the main body part from one end side to the other end side. The following solutions were taken.

  That is, the invention described in claim 1 includes a first mold and a second mold that mold the inner and outer surfaces of the main body and the outer surface of the filtration part, and a slide mold that molds the inner surface of the filtration part. One of the first mold and the second mold is formed with a recess having a plurality of vertical groove forming protrusions at a predetermined pitch in the circumferential direction on the entire inner peripheral surface, and the slide mold is advanced and retracted into the recess. A first slide type that divides the recessed portion into a plurality of divided spaces in a circumferential direction, and is arranged to be movable in a direction intersecting with the advancing / retreating direction in each of the divided spaces. A molding die comprising a second slide die having a plurality of lateral groove forming ridges on the outer peripheral surface facing the inner peripheral surface at a predetermined pitch in the advance / retreat direction is prepared, and the first slide die and the second slide are prepared. With the mold closed with the mold advanced into the recess, Fill the cavity with molten resin so that there is no gap in the part, and after the molten resin has solidified, move the first slide mold back from the recess, and then move the second slide mold toward the center of the recess The protrusions are separated from the protrusions of the recesses and then retracted from the recesses, and a plurality of vertical grooves are formed by the protrusions of the recesses on the entire outer peripheral surface of the filtration part. A plurality of transverse grooves are formed in an annular shape by the second slide-type protrusions on the entire surface, and through holes that penetrate in the wall thickness direction are formed at a plurality of positions where the transverse grooves and the longitudinal grooves overlap, and the filtration unit An oil strainer in which these through holes are distributed in a mesh shape is obtained over the entire peripheral wall portion.

  According to a second aspect of the present invention, in the method of manufacturing an oil strainer according to the first aspect, the recess has a bottom surface on which a large number of projections for forming pores are projected substantially vertically. The bottom wall portion of the oil strainer is formed with a large number of pores corresponding to the protrusions.

  According to the first aspect of the present invention, since the main body portion and the filtering portion can be molded with a common mold, the mold cost can be reduced as compared with the case where separate molds are used. Furthermore, the assembly process is not required and the number of manufacturing steps is reduced, so that the manufacturing cost can be reduced.

  Further, since the main body portion and the filtration portion are integrally and continuously molded, no assembling error occurs when assembling another member, and there is no possibility that a gap is generated at the assembling location. Therefore, oil does not enter and exit from the assembly location, and the filtration function is improved.

  Moreover, since the filtration part is formed in a bag shape, it is possible to ensure a wide oil filtration area as compared with the case where the filter portion is formed in a plate shape as in Patent Document 1.

  According to the second aspect of the present invention, since the oil is filtered also by the bottom wall portion, the filtration area is increased as compared with the case where pores are not provided in the bottom wall portion, thereby reducing the suction resistance.

It is a front view of the oil strainer manufactured by the manufacturing method concerning Embodiment 1 of the present invention. It is sectional drawing in the AA of FIG. It is an enlarged view of the surrounding wall part outer surface of the filtration part of the oil strainer manufactured by the manufacturing method concerning Embodiment 1 of the present invention. It is an enlarged view of the surrounding wall part inner surface of the filtration part of the oil strainer manufactured by the manufacturing method which concerns on Embodiment 1 of this invention. It is a top view of the oil strainer manufactured by the manufacturing method concerning Embodiment 1 of the present invention. It is sectional drawing in the BB line of FIG. (A) is a manufacturing process figure corresponding to FIG. 6 which shows the state which advanced the 1st slide type | mold and the 2nd slide type | mold into the recessed part of the columnar protrusion part of the 1st type | mold, (b) is a 1st slide. FIG. 7C is a manufacturing process diagram corresponding to FIG. 6 showing a state in which the mold is retracted from the recess of the first mold columnar protrusion, and (c) shows the second slide mold in the center of the recess of the columnar protrusion of the first mold. It is a manufacturing process figure corresponding to FIG. 6 which shows the state moved. (A) is sectional drawing corresponding to CC line of Fig.7 (a), (b) is sectional drawing corresponding to DD line of FIG.7 (b), (c) is FIG. 8 is a cross-sectional view corresponding to the line EE in FIG. It is a disassembled perspective view of the oil strainer manufactured by the manufacturing method which concerns on Embodiment 2 of this invention. It is a perspective view of the oil strainer manufactured by the manufacturing method concerning Embodiment 2 of the present invention.

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

(Embodiment 1)
1-6 shows the oil strainer 1 manufactured by the manufacturing method which concerns on Embodiment 1 of this invention. This oil strainer 1 is provided with a plastic cylindrical main body part 3, and inside the main body part 3, a resin filtering part 5 having one end opened and a bottom wall part 41 at the other end is disposed. The filtration part 5 is formed in a bottomed cylindrical shape whose diameter gradually increases toward the opening end side. The filtration unit 5 divides the inside of the main body 3 into an upper end side (downstream side in the oil flow direction) and a lower end side (upstream side in the oil flow direction), and the opening end portion is in the oil flow direction more than the counter opening end portion. It is integrally continuous with the lower end edge of the main body 3 at the periphery of the opening end so as to be located on the upstream side. Except for a region where the first slide mold 27 and the inner peripheral surface, which will be described later, are in contact with each other, a plurality of vertical grooves 35 are formed on the entire outer peripheral surface of the filtration part 5, and a plurality of strips are formed on the entire inner peripheral surface. Are formed in an annular shape, and through holes 39 penetrating in the wall thickness direction are formed at a plurality of locations where the vertical grooves 35 and the horizontal grooves 37 overlap, and are distributed in a mesh shape on the entire peripheral wall portion 6 of the filtration portion 5. . In addition, a large number of pores 43 are formed in the bottom wall portion 41 in a mesh shape in a region excluding a substantially cross-shaped region where the inner surface is in contact with the first slide mold 27 described later.

  On the outer periphery on the upper end side of the main body 3, a plate-like projecting piece 7 is integrally projected over the entire circumference in the radially outward direction. A pair of bolt insertion holes 9 penetrating in the plate thickness direction is formed in the overhanging piece portion 7 so as to be located on the opposite side 180 degrees across the major axis of the opening of the main body portion 3. A metal collar 11 is fitted in each bolt insertion hole 9. A circular annular groove 13 is formed on the upper end surface of the main body 3 over the entire circumference, and a rubber sealing O-ring 15 is fitted in the annular groove 13. Furthermore, the lower end edge of the main body 3 is inclined upward toward one side in the minor 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 main body 3, the outer surface of the filtering unit 5, the upper surface of the overhanging piece 7, and the inner peripheral surface of the bolt insertion hole 9 are formed. A first mold 17 (fixed mold), a second mold 19 (movable mold) that molds the outer surface of the main body 3 and the lower surface and side surfaces of the overhanging piece 7, and a slide mold that molds the inner surface of the filter section 5. 21 is used. Before describing a specific manufacturing method, the mold structure of the mold 22 will be described.

  The first mold 17 has a columnar protrusion 17a for molding the inner surface of the main body 3, and a recess 17b is formed on the tip surface of the columnar protrusion 17a. It is formed in an elliptical cross section so that the diameter gradually decreases over the bottom side. On the entire inner peripheral surface excluding the area facing the first slide mold 27, which will be described after the recess 17b, a plurality of ridges 23 for forming the vertical grooves 35 are provided at a predetermined pitch in the circumferential direction. In addition, a large number of projections 25 for forming the pores 43 are provided substantially vertically in the region excluding the substantially cross-shaped region facing the first slide mold 27 described later on the bottom surface of the recess 17b. Yes. An annular projection 18 for forming the annular groove 13 is provided on the proximal end side of the columnar protrusion 17a of the first mold 17 so as to surround the columnar protrusion 17a. The first mold 17 is formed with a pair of protrusions 20 for forming the bolt insertion holes 9 so as to sandwich the columnar protrusion 17a from two opposite directions.

  On the other hand, the second mold 19 has a recess 19a for molding the main body 3 and the lower and side surfaces of the projecting piece 7, and the slide mold 21 is formed on the bottom surface of the recess 19a. An insertion hole 19b for insertion is formed.

  The slide mold 21 includes a first slide mold 27 and four second slide molds 29, and is inserted into the recess 17 b of the first mold 17 while being inserted through the insertion hole 19 b of the second mold 19. It is arranged to be able to advance and retreat. The first slide mold 27 is formed in a columnar shape having a substantially cross-shaped cross section, and is disposed in the recess 17b so as to be able to advance and retract so as to divide the recess 17b of the first mold 17 into four divided spaces. Each of the second slide molds 29 is formed in a columnar shape having a cross-sectional shape obtained by dividing an ellipse into a major axis and a minor axis, and is movable in a direction intersecting with the advancing / retreating direction. Is arranged. On the outer peripheral surface facing the inner peripheral surface of the concave portion 17b of the second slide mold 29, a plurality of protrusions 31 for forming the lateral grooves 37 are formed over the entire length at a predetermined pitch in the forward / backward direction. .

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

  First, the second mold 19 is advanced to approach the first mold 17, and the columnar protrusion 17 a of the first mold 17 is inserted into the recess 19 a of the second mold 19. Further, the first slide mold 27 and the second slide mold 29 are advanced from the insertion hole 19b of the second mold 19 into the recess 17b of the first mold 17, thereby closing the mold 22 and forming the cavity 33. To do. In this state, as shown in FIG. 7A and FIG. 8A, a gap is generated at the intersection of the protrusion 23 of the recess 17b of the first mold 17 and the protrusion 31 of the second slide mold 29. In other words, the protrusion 25 of the recess 17b and the end surface in the advancing direction of the second slide mold 29 are in contact with each other. The formed cavity 33 is filled with a molten resin (not shown) from a space formed between the tip of the first slide mold 27 and the inner peripheral surface of the recess 17b of the first mold 17. At this time, since the protrusions 23 and the protrusions 25 are not formed in the regions facing the first slide mold 27 on the inner peripheral surface and the bottom surface of the concave portion 17b, it becomes a passage for the molten resin communicated with the cavity of the main body portion 3, The molten resin spreads smoothly over the entire cavity space corresponding to the filtration part 5.

  Next, after the filled molten resin is solidified, as shown in FIGS. 7B and 8B, the first slide mold 27 is retracted from the recess 17b. Next, as shown in FIGS. 7 (c) and 8 (c), after the second slide mold 29 is moved toward the center of the recess 17b, the protrusion 31 is separated from the protrusion 23 of the recess 17b. , Retract from the recess 17b.

  Thereafter, the second mold 19 is retracted and separated from the first mold 17 to open the mold 22, and the molded oil strainer 1 is removed. As shown in FIGS. 2 to 6, a plurality of longitudinal grooves 35 are formed on the entire outer peripheral surface excluding a region where the first slide mold 27 and the inner peripheral surface of the filtration part 5 of the oil strainer 1 thus obtained are in contact with each other. Is formed by the protrusions 23 of the recess 17b, and a plurality of lateral grooves 37 are formed in an annular shape by the protrusions 31 of the second slide mold 29 on the entire inner peripheral surface, and the vertical grooves 35 and the horizontal grooves 37 overlap. Through holes 39 penetrating in the wall thickness direction are formed at a number of locations, and are distributed in a mesh shape on the entire peripheral wall portion 6 excluding a region where the first slide mold 27 of the filtration portion 5 is in contact with the inner peripheral surface. Further, in the bottom wall portion 41 excluding the substantially cross-shaped region where the inner surface is in contact with the first slide mold 27, a large number of pores 43 corresponding to the protrusions 25 are formed penetrating in a mesh shape. A portion of the portion 5 that is in contact with the first slide mold 27 and in which the through hole 39 and the pore 43 are not formed maintains the rigidity of the filtering portion 5 as a beam that supports the filtering portion 5.

  The oil strainer 1 manufactured as described above is housed in an oil pan, and engine oil suction is performed by bolting in a state where the metal collars 11 are fitted in both bolt insertion holes 9 of the protruding piece 7. It is attached to the periphery of the mouth (not shown). In this state, the O-ring 15 is brought into pressure contact with the bottom surface of the annular groove 13 and the peripheral portion of the oil suction port to prevent oil and air from entering and exiting. When the engine is driven in this state, the oil in the oil pan is sucked from the lower end side opening of the main body portion 3 and filtered through the through hole 39 or the pore 43 of the filtering portion 5 and flows out from the upper end side. Then, the oil is supplied to the sliding portion of the engine through the oil pump.

  Therefore, according to this embodiment, since the main-body part 3 and the filtration part 5 can be shape | molded with the common shaping | molding die 22, a die cost can be reduced compared with the case where a separate shaping | molding die is used. Furthermore, the assembly process is not required and the number of manufacturing steps is reduced, so that the manufacturing cost can be reduced.

  Moreover, since the main-body part 3 and the filtration part 5 are shape | molded integrally continuously, the assembly | attachment error at the time of assembling another member does not arise, and there is no possibility that a clearance gap may arise in an assembly location. Therefore, oil does not enter and exit from the assembly location, and the filtration function is improved.

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

  Further, since the oil is also filtered by the bottom wall portion 41, the filtration area is increased as compared with the case where the pores 43 are not provided in the bottom wall portion 41, thereby reducing the suction resistance.

(Embodiment 2)
9 and 10 show an oil strainer 1 manufactured by the manufacturing method according to Embodiment 2 of the present invention. The oil strainer 1 is configured by connecting a first conduit 45 and a second conduit 47 to each other. Since the 1st conduit | pipe 45 is provided with the main-body part 3 and the filtration part 5, and has the same shape as the oil strainer 1 manufactured by the manufacturing method which concerns on Embodiment 1, it is the same code | symbol about the same structure. The description is omitted. However, the lower end edge of the main body portion 3 of the first conduit 45 is not inclined, and a pair of arc-shaped flange portions 49 extending along the lower end edge and facing each other at the lower end of the main body portion 3 have a diameter. It is integrally formed to project outward.

  On the other hand, the second conduit 47 includes a tubular main body 51 that is curved in a substantially U-shape, and a plate-like flange portion 53 is formed on the upper end edge of the tubular main body 51 in the radially outward direction. It is overhanging and formed integrally. On the upper surface of the flange portion 53, a pair of arc-shaped projecting portions 55 along the outer peripheral edge are provided so as to correspond to the gap of the flange portion 49 of the first conduit 45. In addition, a cylindrical insertion portion 57 that protrudes from the inside to the main body portion 3 of the first conduit 45 protrudes on the radially inner side of the protruding portion 55 of the flange portion 49. In addition, a pair of semicircular cutouts 59 are formed 180 degrees opposite to the lower edge of the main body 51 of the second conduit 47, and the bottom surface of the oil pan is the bottom of the main body 51 of the second conduit 47. The lower end side opening is blocked.

  In order to manufacture the 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 method for manufacturing the oil strainer 1 according to the first embodiment. However, a recess for molding the flange portion 49 is provided on the inner surface of the recess 19a of the second mold 19 used for manufacturing.

  As shown in FIG. 10, the cylindrical insertion portion 57 of the second conduit 47 is inserted into the opening on the lower end side of the main body portion 3 of the first conduit 45, and the protrusion 55 of the second conduit 47 is inserted into the flange of the first conduit 45. The first conduit 45 and the second conduit 47 are welded to each other in this state.

  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 circle such as a rectangle.

  In the first and second embodiments, the filtering part 5 is formed into a bottomed elliptical cylinder whose diameter gradually increases toward the opening end side. However, the filtering part 5 has a cylindrical shape having a cross section other than an elliptical shape such as a rectangle. It may be formed. Also, if the cross-sectional area is not narrower from the opening end side to the non-opening end side than the anti-opening end side, other than the cone shape with one end open or the bottomed cylindrical shape with a constant diameter, etc. It may be formed in a cylindrical shape.

  In the first and second embodiments, the opening end of the filtering unit 5 is located on the upstream side in the oil flow direction with respect to the opposite opening end, but may be located on the downstream side in the oil flow direction. In this case, the mold 22 has a mold structure in which the second mold 19 molds at least the inner surface of the main body portion 3 and the outer surface of the filtration portion 5.

  Further, in the first and second embodiments, the first slide mold 27 is formed in a columnar shape having a substantially cross section, and the second slide mold 29 is formed in a columnar shape having a sectional shape obtained by dividing an ellipse into a major axis and a minor axis. Formed. However, by retracting the first slide mold 27, the second slide mold 29 is moved toward the center of the recess 17b, and the protrusion 31 is separated from the protrusion 23 of the recess 17b, and retracts from the recess 17b. If possible, the first slide mold 27 and the second slide mold 29 may have other shapes.

  The present invention includes, for example, a cylindrical resin main body portion and a resin filtration portion disposed inside the main body portion, and a process of allowing oil to pass through the main body portion from one end side to the other end side. It is useful as a method for producing an oil strainer that is filtered through a filtration part.

1 Oil strainer
3 Body
5 Filtration part
6 peripheral wall
17 Type 1
17b recess
19 Type 2
21 Slide type
22 Mold
23 ridges
25 Protrusions
27 First slide type
29 Second slide type
31 ridges
33 cavities
35 Longitudinal groove
37 Horizontal groove
39 Through hole
41 Bottom wall
43 pores

Claims (2)

Cylindrical resin main body with both ends open and the inside of the main body so that the cross-sectional area does not become narrower from the opening end to the opening side than the opening side. It is formed into a cylindrical shape with a bottom or a shell-shaped cone with one end open, and is integrated with the main body at the periphery of the opening end so as to divide the inside of the main body into one end and the other end. A continuous resin filtration part, and a method for producing an oil strainer that filters oil through the filtration part in the process of passing the oil from one end side to the other end side through the inside of the main body part,
A first mold and a second mold for molding the inner and outer surfaces of the main body and the outer surface of the filtration part, and a slide mold for molding the inner surface of the filtration part, one of the first mold and the second mold, A recess having a plurality of ridges for forming vertical grooves at a predetermined pitch in the circumferential direction is formed on the entire inner peripheral surface, and the slide mold is disposed so as to be able to advance and retreat in the recess. A first slide mold that divides into a plurality of divided spaces; a plurality of strips on an outer peripheral surface that is arranged to be movable in a direction crossing the advancing and retreating direction in each of the divided spaces and facing the inner peripheral surface of the recess; Preparing a molding die composed of a second slide die having a plurality of lateral groove forming protrusions at a predetermined pitch in the advancing and retreating direction,
The mold is closed with the first slide mold and the second slide mold advanced into the recess, and the cavity is filled with a molten resin so that no gap is formed at the intersection of the two protrusions. After the resin is solidified, the first slide mold is retracted from the recess, and then the second slide mold is moved toward the center of the recess to separate the protrusion from the protrusion of the recess, The plurality of longitudinal grooves are formed by the protrusions of the recesses on the entire outer peripheral surface of the filtration part, and the plurality of lateral grooves are formed annularly by the second slide-type protrusions on the entire inner peripheral surface. A through hole penetrating in the wall thickness direction is formed in a plurality of locations where the horizontal groove and the vertical groove overlap, and an oil strainer in which the through holes are distributed in a mesh shape on the entire peripheral wall portion of the filtration portion is obtained. Made of characteristic oil strainer Method. In the manufacturing method of the oil strainer of Claim 1,
The concave portion has a bottom surface on which a large number of projections for forming pores are projected substantially vertically,
A method for producing an oil strainer, wherein a plurality of pores corresponding to the protrusions are formed through a bottom wall portion of the oil strainer to be molded.

Images