JP2006205047A - Oil strainer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil strainer 1 in which a filter medium 5 can be prevented from slipping out of a filter medium holding attaching section 11 and further collected foreign matters inside the filter medium 5 can be prevented from flowing out of an outer periphery superposing section 5b of the filter medium 5 in the oil strainer 1 which is constituted by arranging the filter medium 5 inside a case 2 equipped with a suction port and an ejection port of oil and which is constituted by providing the filter medium holding attaching sections 11 at a pair of case members 6, 7 forming the case 2 and holding the outer periphery superposing section 5b of the filter medium 5 between the filter medium holding attaching sections 11. <P>SOLUTION: A slipping out stopping engaging section 19 which is formed by integrally melting the outer periphery superposing section 5b of the filter medium 5 to increase its thickness is provided and then the slipping out stopping engaging section 19 is arranged outside the filter medium holding attaching sections 11 and is engaged with the filter medium holding attaching sections 11 to prevent slipping out of the filter medium 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an oil strainer used for an oil circulation system or the like in an automatic transmission (AT) of a vehicle such as an automobile.

  Conventionally, an oil strainer 51 shown in FIGS. 6 and 7 is known, and is configured as follows.

  That is, first, a hollow case 52 having an oil suction port 53 and a discharge port 54 is provided, and a filter medium 55 made of a nonwoven fabric or the like functioning as a filter is disposed inside the case 52, and the inside of the case 52 is sucked. Foreign matter such as scale contained in oil flowing from the port 53 to the discharge port 54 is filtered.

  The case 52 comprises a combination of a resin lower case member 56 provided with a suction port 53 and a resin upper case member 57 provided with a discharge port 54. The upper and lower case members 56, 57 are They are integrated by being welded together at the periphery. For this reason, the welding part 58 which consists of the combination of the welding convex part 59 provided in the upper case member 57 and the welding recessed part 60 provided in the lower case member 56 is provided in the peripheral part of both the case members 56 and 57. It has been.

  Further, on the inner side (right side in FIG. 7) of the welded portion 58, a filter medium clamping portion 61 for sandwiching the peripheral edge portion of the filter medium 55 between the case members 56 and 57 is provided. It consists of the combination of the pinching convex parts 62 and 63 provided in the case members 56 and 57, respectively. The pair of sandwiching projections 62 and 63 are opposed to each other, and a predetermined gap c for sandwiching the filter medium 55 is set between the projections 62 and 63.

  The filter medium 55 is formed by folding a flat sheet material made of, for example, a non-woven fabric in half, an open end (not shown) opposite to the folded end (not shown), and side portions 55a on the left and right sides. Is sandwiched between the projecting portions 62 and 63 when the case members 56 and 57 are welded to form a bag shape, and the filter material 55 thus formed into a bag shape is transferred from the suction port 53 to the discharge port 54. It arrange | positions so that the flow path inside case 52 which faces may be interrupted. Therefore, the space inside the case 52 is partitioned into an inner space 64 and an outer space 65 of the filter medium 55 by the bag-shaped filter medium 55.

  In addition, a through hole 66 is provided in the lower surface portion of the filter medium 55 so that oil can be directly introduced into the inner space 64 of the bag-shaped filter medium 55 from the suction port 53. The portion 66 a is fixed to a flange portion 67 provided inside the suction port 53.

  When assembling the oil strainer 51 having the above configuration, first, the through hole peripheral edge portion 66 a of the filter medium 55 is fixed to a flange portion 67 provided inside the suction port 53 of the lower case member 56. Next, the filter medium 55 made of a planar sheet material is folded in half, and the outer peripheral overlapping part made up of the open end part and the side parts 55a on both the left and right sides is sandwiched between the sandwiching convex parts 62, 63 of the case members 56, 57. In this state, both case members 56 and 57 are welded at the welded portion 58. Accordingly, the case members 56 and 57 are welded to each other at the welded portion 58, and the filter material 55 is sandwiched between the protruding convex portions 62 and 63 of the case members 56 and 57 so that the case members 56 are sandwiched between the outer peripheral overlapping portions. , 57 is fixed.

  However, the above prior art has the following disadvantages.

  That is, in the above prior art, the fixing of the outer peripheral overlapping portion of the filter medium 55 to the case members 56 and 57 uses the frictional force of pinching by the pinching convex portions 62 and 63. If the gap c set between the wearing protrusions 62 and 63 is too large, the pinching force for fixing the filter medium 55 will be small, and therefore the filter medium 55 will be pinched when a large drop load (such as negative pressure) acts on the filter medium 55. There is a risk of slipping out of the case 5 from between the convex portions 62 and 63.

  Conventionally, in order to prevent the filter medium 55 from coming off, as shown in FIG. 8, the upper and lower case members 56 and 57 are each provided with a pointed protrusion 71, and the pointed protrusion 71 is inserted into the filter medium 55 to penetrate therethrough. In order to prevent the filter medium 55 from being removed by mechanical engagement by inserting the projections 71, it is possible to exert a certain level of retaining force. (See Patent Document 1).

  However, in this prior art, the hole 55b is opened on the flat surface of the filter medium 55 by inserting the protrusion 71, and therefore when the filter medium 55 is subjected to a large pulling load (such as negative pressure), the peripheral edge of the hole 55b is pulled. Stress concentrates, and as a result, the filter medium 55 may be broken from the peripheral portion of the hole 55b and damaged.

  Further, as another preventive measure, as shown in FIG. 9, a technique for increasing the retaining force by crushing the tips of the pinching convex portions 62 and 63 provided on the upper and lower case members 56 and 57 at the time of welding is also developed. However, compared with the technique shown in FIG. 5 and FIG. 6, the retaining force does not increase significantly (see Patent Document 2).

  Furthermore, as a common concern common to the prior art, since the outer circumferential overlapping portion of the filter medium 55 is not integrated, when the filter medium 55 is not sufficiently sandwiched, the filter medium 55 is overlapped in addition to the removal of the filter medium 55. There is a possibility that foreign matter flows out from the part (foreign matter focused inside the filter medium 55 flows out from the overlapping part of the filter medium 55).

  Furthermore, in recent years, automatic transmissions tend to be multistage or downsized, and have become more precise. Foreign substances generated in the transmission (transmission device) must be reliably supplemented by an oil strainer.

  In addition, the excessive negative pressure is often caused by clogging of the filter medium 55 due to a large amount of foreign matter generated for some reason, and the excessive negative pressure prevents the fixing portion on the outer periphery of the filter medium 55 from being removed, There is a need to prevent foreign matter from flowing out of the oil strainer and to minimize damage to the transmission (transmission).

JP 2004-218691 A US Pat. No. 5,049,274

  In view of the above points, the present invention can effectively prevent the filter medium from slipping out of the sandwiched portion of the case, and it is also effective that the collected foreign matter inside the filter medium flows out from the outer circumferential overlapped portion of the filter medium. An object of the present invention is to provide an oil strainer that can be prevented.

  In order to achieve the above object, an oil strainer according to the present invention is an oil strainer in which a filter medium is disposed inside a case having an oil inlet and an outlet, and the filter medium is sandwiched between a pair of case members forming the case. In the oil strainer provided with a fitting portion and sandwiching the outer circumferential overlapping portion of the filter medium in the clamping portion, a retaining engagement portion in which the overlapping portion of the filter medium is fused and integrated to increase the thickness of the overlapping portion. Provided, and the retaining engagement portion is disposed outside the sandwiching portion and is engaged with the sandwiching portion by retaining.

  In the oil strainer of the present invention having the above-described configuration, the outer periphery overlapping portion of the filter medium is melted and integrated, and a retaining engagement portion having an increased thickness is provided in the portion, and this retaining engagement portion is the case. Since it is disposed outside the sandwiching portion and is engaged with the sandwiching portion, the retaining structure is realized not only by the frictional force but also by mechanical engagement. In addition, since the outer circumferential overlapping portion of the filter medium is melted and integrated in this manner, the outflow path of the foreign matter converged inside the filter medium is blocked.

  The present invention has the following effects.

  In other words, in the oil strainer of the present invention, as described above, the outer periphery overlapping portion of the filter medium is melted and integrated, and a retaining engagement portion having an increased thickness is provided at the portion. Since it is disposed outside the sandwiching portion and is engaged with the sandwiching portion to prevent it from coming off, a retaining structure is formed by mechanical engagement rather than simply by frictional force. Therefore, it is possible to effectively prevent the filter medium from coming out of the sandwiched portion of the case. Further, since the filter medium is not perforated, the filter medium is not torn and damaged from the peripheral edge of the hole.

  In addition, as described above, the outer circumferential overlapping portion of the filter medium is melted and integrated, and the outflow path of the foreign matter focused inside the filter medium is blocked, so that the foreign matter focused inside the filter medium is removed from the overlapping portion of the filter medium. It is possible to effectively prevent the leakage.

The present invention includes the following embodiments.
Constitution···
The outer periphery overlapping portion of the filter medium is melted and integrated with heat or the like, and a shape is formed so that a convexity appears in the vertical direction (overlapping direction). On the other hand, the case is provided with a space for hooking the convex shape formed on the outer periphery of the filter medium.
Effect ...
According to the said structure, the following effects are exhibited.
(1) Since the filter medium is melted and integrated, the outer circumferential overlapping portion of the filter medium is completely sealed, and therefore no foreign matter flows out.
(2) Since the shape is physically hooked by the convex shape formed on the outer periphery of the filter medium and the space provided in the case, the filter medium will not come out even if a large load is applied.
(3) Since no hole is formed in the filter medium, stress concentration does not occur when a load is applied. Therefore, the filter medium is not broken and the reliability is remarkably improved.
(4) As described above, compared with conventional products, the effect of preventing the filter medium from slipping out and preventing foreign matter from flowing out is improved, and an oil strainer having excellent durability in the initial and long term can be provided.

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

  FIG. 1 shows a cross section of an oil strainer 1 according to an embodiment of the present invention, and FIG. 2 shows an enlarged view of a main part thereof.

  The oil strainer 1 according to this embodiment is configured as follows.

  That is, first, a hollow case 2 having an oil suction port 3 and a discharge port 4 is provided, and a filter medium (also referred to as a filtration member) 5 made of a nonwoven fabric or the like functioning as a filter is disposed inside the case 2. Thus, the inside of the case 2 is configured to filter foreign matters such as scale contained in the oil flowing from the suction port 3 to the discharge port 4.

(1) Case 2
The case 2 is a combination of a resin lower case member (also referred to as a lower case) 6 provided with a suction port 3 and a resin upper case member (also referred to as an upper case) 7 provided with a discharge port 4. The case members 6 and 7 are integrated by being welded to each other at their peripheral portions.

(2) Welding part 8
For this reason, at the peripheral part of both case members 6, 7, there is a welded portion 8 made of a combination of a welded convex portion 9 provided on the upper case member 7 and a welded concave portion 10 provided on the lower case member 6. It is provided all around. The arrangement of the convex portion 9 and the concave portion 10 may be upside down.

(3) Filter material clamping part 11
A filter material sandwiching portion for sandwiching the peripheral portion of the filter medium 5 between the case members 6 and 7 on the opposing surfaces of the upper and lower case members 6 and 7 located inside the welded portion 8 (left side in FIG. 2). 11 is provided, and this clamping part 11 is comprised by the combination of the clamping convex parts 12 and 13 provided in both case members 6 and 7, respectively. The pair of sandwiching convex portions 12 and 13 are disposed so as to face each other, and a predetermined gap c for sandwiching the filter medium 5 is set between the convex portions 12 and 13. In addition, a space portion 14 is provided between the sandwiching portion 11 and the welding portion 8.

(4) Filter medium 5
As shown in FIG. 3 as a single item, the filter medium 5 is formed by folding a flat sheet material made of, for example, a non-woven fabric in half, and an open end 5c opposite to the folded end 5a and left and right side portions 5d. And the upper and lower case members 6 and 7 are sandwiched between the convex portions 12 and 13 to be formed into a bag shape, and the filter medium 5 thus formed into a bag shape is discharged from the suction port 3 to the discharge port. It arrange | positions so that the flow path in the case 2 which goes to 4 may be interrupted | blocked. Therefore, the space inside the case 2 is partitioned into an inner space 15 and an outer space 16 of the filter medium 5 by the bag-shaped filter medium 5.

  Further, a through hole 17 is provided in the lower surface of the filter medium 5 so that oil can be directly introduced into the inner space 15 of the bag-shaped filter medium 5 from the suction port 3. The portion 17 a is fixed to a flange portion 18 provided inside the suction port 3.

Further, in the embodiment, in particular, as shown in FIGS. 4A to 4B, the open end portion 5c and the left and right side portions 5d constituting the outer periphery overlapping portion 5b in the filter medium 5 are respectively provided. is melted integrally with the upper and lower two-ply, this outer peripheral overlapping portions 5b, the stop engaging portion 19 missing increased the thickness t ₂ is provided, as shown in FIG. 2, the retaining engagement The part 19 is arranged outside the sandwiching part 11 (on the right side in FIG. 2) and accommodated in the space part 14, so that the part 19 faces the inside of the case 2 (left side in FIG. 2) with respect to the sandwiching part 11. The stopper is engaged.

The thickness t ₂ of the retaining engagement portion 19 is set to be larger than the thickness t ₁ × 2 (where t ₁ is the thickness of one filter medium) (t ₂ > t ₁ × 2). The clearance c is set larger than the gap c between the pair of sandwiching convex portions 12 and 13 so as to realize mechanical engagement of the retaining engagement portion 19 with the sandwiching portion 11 (t ₂ > c).

  When assembling the oil strainer 1 having the above-described configuration, first, the through hole peripheral edge portion 17 a of the filter medium 5 is fixed to the flange portion 18 provided inside the suction port 3 of the lower case member 6. Fixing is performed by welding, for example, ultrasonic welding is performed. Next, as shown in FIG. 3, the filter medium 5 made of a flat sheet material is folded in half, and the open end portion 5c and the left and right side portions 5d are overlapped to form an outer peripheral overlapping portion 5b. The part 5b is heated and melted and integrated to form a retaining engagement part 19. Next, the retaining engagement portion 19 is positioned in the space portion 14 of the lower case member 6 and the upper case member 6 is covered. In this state, the upper and lower case members 6 and 7 are welded at the welding portion 8. As welding, for example, ultrasonic welding is performed. Accordingly, both case members 6 and 7 are welded to each other at the welded portion 8, and the filter medium 5 is provided with a retaining engagement portion 19 disposed outside the sandwiching portion 11 so as to be secured against the sandwiching portion 11. Is done.

  The oil strainer 1 having the above-described configuration is characterized in that the following functions and effects are achieved by the above-described configuration.

  That is, first, as described above, the outer periphery overlapping portion 5b of the filter medium 5 is fused and integrated, and the outer periphery overlapping portion 5b is provided with the retaining engagement portion 19 having an increased thickness. Is arranged on the outside of the sandwiching portion 11 of the case 2 and is engaged with the sandwiching portion 11 to prevent it from coming off. A retaining structure is configured by joining. Therefore, it is possible to effectively prevent the filter medium 5 from coming out of the sandwiching portion 11 of the case 2. Moreover, since the filter medium 5 is not perforated, the filter medium 5 is not broken and damaged from the peripheral edge of the hole.

  Further, since the outer circumferential overlapping portion 5b of the filter medium 5 is melted and integrated, and the outflow path of the foreign matter focused inside the filter medium 5 (inner space 15) is blocked, the foreign matter focused inside the filter medium 5 is filtered. Outflow from the five overlapping portions 5b can be effectively prevented.

  In addition, about the oil strainer 1 which concerns on the said Example, it is possible to add various changes in the category which can implement | achieve the objective of this invention.

For example, in the above embodiment, as shown in FIG. 4 (A), the retaining engagement portion 19 is formed by melting and integrating the outer peripheral overlapping portion 5b of the filter medium 5 in a state of being overlapped in a plane. However, as shown in FIG. 5, the retaining engagement portion 19 may be formed by fusing and integrating the end face portions 5e of the upper and lower filter media 5 in the outer peripheral overlapping portion 5b. Even if the retaining engagement portion 19 is formed in this way, the thickness t ₂ of the retaining engagement portion 19 is equal to the thickness t ₁ × 2 of two filter media (where t ₁ is the thickness of one filter media). Can also be set larger (t ₂ > t ₁ × 2). In this case, since the hollow portion 20 is formed inside the retaining engagement portion 19, the hollow portion 20 can be used as a foreign substance reservoir.

Sectional drawing of the oil strainer which concerns on the Example of this invention 1 is an enlarged view of the main part of FIG. Explanatory drawing which shows the two-fold state of a filter medium Explanatory drawing which shows the shaping | molding method of the retaining engagement part by fusion | melting integration Sectional drawing of the oil strainer which concerns on the other Example of this invention. Sectional view of oil strainer according to conventional example Enlarged view of the main part of FIG. Cross-sectional view of main parts of an oil strainer according to another conventional example Cross-sectional view of main parts of an oil strainer according to another conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oil strainer 2 Case 3 Suction port 4 Discharge port 5 Filter medium 5a Folding end part 5b Outer periphery overlapping part 5c Open end part 5d Side edge part 5e End surface part 6 Lower case member 7 Upper case member 8 Welding part 9 Welding convex part DESCRIPTION OF SYMBOLS 10 Welding recessed part 11 Filter medium clamping part 12,13 Clamping convex part 14 Space part 15 Inner space 16 Outer space 17 Through-hole 17a Peripheral part 18 Flange part 19 Detachment engaging part 20 Hollow part c Gap t _{1 One} filter medium Minute thickness t ₂ Thickness of retaining part

Claims (1)

An oil strainer (1) in which a filter medium (5) is disposed inside a case (2) having an oil inlet (3) and a discharge port (4), and a pair of cases forming the case (2) In the oil strainer (1) in which the filter medium sandwiching portion (11) is provided in the members (6) and (7), and the outer peripheral overlapping portion (5b) of the filter medium (5) is sandwiched in the sandwiching portion (11).
The overlapping portion (5b) of the filter medium (5) is fused and integrated to provide a retaining engagement portion (19) whose thickness is increased, and the retaining engagement portion (19) is provided as the clamping portion. An oil strainer that is disposed outside (11) and engages with the clamping portion (11) to prevent it from coming off.

Images