JP2015105591A - Oil strainer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To materialize welding with high airtightness, while preventing the generation of resin pieces or metallic pieces during vibration-welding.SOLUTION: At a place corresponding to an annular recessed portion 37 on a surface 41b on a downstream side of an inflow side tubular body 19, an annular projecting portion 47 is formed, which projects toward an outflow side tubular body 17 to be stored in a sandwiching portion 53 of a filter 7, and clips and fixes the sandwiching portion 53 with a surface 31b on an upstream side of the outflow side tubular body 17. An annular projecting portion tip end portion 47b is formed to be narrower than the opening width of the annular recessed portion 37 so as to form a clearance S3 in a width direction between the sandwiching portion 53 and the annular projecting portion tip end portion 47b while a welding rib 35 is vibration-welded by the inflow side tubular body 19 and a fixing portion 51 is clipped and fixed by the annular projecting portion 47 and the surface 31b on the upstream side of a downstream end flange 31.

Description

  The present invention relates to an oil strainer that removes impurities from oil circulating inside a power unit in a vehicle, for example.

  Conventionally, a power device such as an engine or transmission in a vehicle is provided with an oil strainer that removes impurities such as dust contained in oil circulating inside the power device. Patent Document 1 discloses an example of such an oil strainer.

  The oil strainer includes a synthetic resin cup-shaped lower case having an oil inlet, a synthetic resin cup-shaped upper case provided opposite to the lower case, and an oil outlet. And a felt-like filter made of a fiber such as nylon or polyester in which the peripheral portion is sandwiched and fixed between the peripheral portions.

  A flange that projects outward is integrally formed on the peripheral edge of the opening of the lower case over the entire circumference. A step portion is formed one step lower on the inner peripheral side of the upper surface of the flange portion, and a protrusion is integrally formed on the inner peripheral side in the step portion over the entire circumference.

  On the other hand, a flange that protrudes outward is integrally formed on the periphery of the opening of the upper case over the entire circumference. A protrusion corresponding to the step portion of the lower case is formed on the inner peripheral side of the lower surface of the flange, and a protrusion corresponding to the protrusion of the lower case is formed on the entire lower end of the protrusion. Yes. In addition, a welding rib is formed on the outer peripheral side of the lower surface of the collar portion so as to be joined to the upper surface side of the collar portion of the lower case during vibration welding.

  The filter is formed by folding a sheet-like material into two to form a bag. Then, with the periphery of the filter excluding the bent portion positioned in the step of the lower case and the upper case positioned on the upper side of the filter, the protrusion of the upper case is vibrated and welded to the upper surface side of the flange of the lower case. By joining, an oil strainer is manufactured. In this joined state, the peripheral edge portion excluding the bent portion of the filter is sandwiched from above and below by the protrusion of the protrusion of the upper case and the protrusion in the step portion of the lower case. This prevents the filter from falling off between the two cases.

JP-A-9-10525 (paragraph 0015 column to paragraph 0021 column, FIGS. 1 to 3)

  However, since the filter used in the oil strainer of Patent Document 1 has a felt shape, the flow resistance per unit area of oil that passes through the filter is large. Therefore, it is necessary to increase the area of the filter in order to reduce the flow resistance in the entire oil strainer. Further, since the rigidity of the filter is low, it is necessary to increase the rigidity of the case holding the filter. As a result, the entire oil strainer is increased in size and weight, and the degree of freedom in design layout is impaired, which is not preferable from the viewpoint of cost.

  Therefore, instead of a resin filter such as felt, a net-like metal filter that has rigidity, is relatively small and satisfies the filter function, and has a low flow resistance per unit area of oil is used. It is possible to take measures to reduce the size. However, when a metal filter is used for the oil strainer of Patent Document 1, the following various problems occur during vibration welding.

  That is, the peripheral edge portion except the bent portion of the metal filter is sandwiched between the upper case protrusion and the lower case protrusion. Therefore, at the time of vibration welding, there is a problem in that both cases made of synthetic resin are scraped off by the metal filter and resin pieces are generated.

  Moreover, since the metal filter has a net shape formed by weaving a plurality of metal wires, the peripheral edge thereof is easily loosened. Therefore, at the time of vibration welding, if the protrusions of both cases vibrate with the peripheral portion of the metal filter sandwiched between them, the peripheral portion of the filter is loosened and a metal piece is generated. As a result, there is a problem that metal pieces are mixed into the oil passing through the oil strainer.

  In addition, during vibration welding, the upper case protrusion and the lower case sandwich the peripheral edge except for the bent portion of the metal filter, so the reaction force from the metal filter acts on the upper case where the welding ribs are formed. To do. As a result, there is a problem that the welding rib of the upper case is not sufficiently pressed against the upper surface of the flange portion of the lower case, making it difficult to weld with high airtightness.

  The present invention has been made in view of the above points, and the object of the present invention is to realize a highly airtight welding while preventing resin pieces and metal pieces from being generated during vibration welding, and to achieve a small size. And providing an inexpensive oil strainer.

  In order to achieve the above object, in the oil strainer provided with a metal filter and a pair of resin tubular bodies that sandwich and fix the filter, the present invention has been devised in the shape of the divided surface of each tubular body. Is.

  Specifically, in the present invention, an oil inlet and an oil outlet are formed at one end and the other end, respectively, and an oil flow path is formed between the both ends. A cylindrical resin case that flows out from the oil outlet through the oil flow path; and an oil filtering filter disposed in the oil flow path. While having a first tubular body and a second tubular body divided by a dividing surface intersecting the center line, the first tubular body and the second tubular body are configured by vibration welding on the dividing surface, The following solution was taken for the oil strainer in which the outer peripheral edge of the filter was sandwiched and fixed by the first tubular body and the second tubular body at a location corresponding to the dividing surface.

  That is, according to the present invention, the filter has a net shape composed of a plurality of metal wires, the filter section covering the oil passage, and the first tubular body projecting outward from the outer peripheral edge of the filter section. And an annular fixing portion sandwiched and fixed by the second tubular body, and the fixing portion is provided with an annular sandwiching portion having a convex cross section projecting toward the first tubular body, At least one of the tubular bodies facing the counterpart tubular body is provided with an annular welded portion that protrudes toward the counterpart tubular body and whose tip is vibration welded to the counterpart tubular body. An annular shape is provided on the inside of the welded portion on the surface of the first tubular body on the second tubular body side, corresponding to the convex shape of the cross section of the sandwiched portion, and the sandwiched portion is accommodated. While the recess is formed, the first tubular body of the second tubular body An annular convex portion that protrudes toward the first tubular body and opposes the sandwiched portion is formed at a location corresponding to the annular concave portion on the surface, and the welded portion is formed at the tip of the annular convex portion. It is vibration welded to the opposite tubular body, and the fixed portion is held and fixed between the annular convex portion and the first tubular body. It is characterized by being formed narrower than the width of the sandwiched portion so that a gap is formed in the direction.

  According to the present invention, a relatively inexpensive net-like metal filter is used. This metal filter has rigidity, is relatively small in size, satisfies the filter function, and has a unit area of oil. The flow resistance per hit can be reduced. Therefore, it is possible to provide a small and inexpensive oil strainer.

  Further, according to the present invention, both the tubular bodies are vibration welded and joined, and the sandwiched portion that is a part of the fixed portion of the filter is accommodated in the annular recess of the first tubular body, and the fixed portion is the second tubular shape. A gap is formed in the width direction between the distal end portion and the sandwiched portion of the annular projecting portion in a state of being sandwiched and fixed by the annular projecting portion of the body and the surface on the second tubular body side of the first tubular body. Therefore, at the time of vibration welding, the tip of the annular convex portion does not strongly hit the sandwiched portion fitted along the bottom surface of the annular concave portion. Therefore, the annular convex portion is not scraped by the metal filter, and the generation of the resin piece can be prevented. At the same time, since the sandwiched portion of the filter does not hit the annular convex portion of the second tubular body, the end of the metal wire forming the filter is not loosened, and the generation of metal pieces can be prevented.

  According to the present invention, the sandwiched portion of the filter is accommodated in the annular recess of the first tubular body, and the tip of the annular projecting portion of the second tubular body is accommodated in the sandwiched portion. Therefore, even if oil flows through the oil flow path, the filter portion of the filter is pushed by the oil, and the sandwiched portion of the outer peripheral edge of the filter portion is pulled inward, the radially inner portion of the sandwiched portion is the bottom surface of the annular recess. And the radially outer portion of the sandwiched portion is caught by the tip of the annular convex portion, so that the sandwiched portion does not come off the surface of the first tubular body on the second tubular body side. Therefore, it is possible to prevent the filter from coming off from the case.

  Further, according to the present invention, since the sandwiching portion does not come off from the surface of the first tubular body on the second tubular body side due to the catch, the fixing portion is fixed to the first tubular body and the second tubular body during vibration welding. Therefore, it is not necessary to firmly hold the fixing portion, and a large reaction force that separates the two tubular bodies from the sandwiching portion to the two tubular bodies does not act. Therefore, the welded portion can be sufficiently brought into pressure contact with the counterpart tubular body during vibration welding. Therefore, it is possible to realize welding with high airtightness.

It is a figure which shows the oil strainer which concerns on embodiment of this invention, Comprising: (a) is a top view, (b) is a side view, (c) is the Ic part expanded sectional view of (b). It is a figure which shows an outflow side division body, Comprising: (a) is a top view, (b) is a side view, (c) is the IIc part enlarged view of (b), (d) is (a) Is a sectional view taken along line IId-IId of FIG. It is a figure which shows an inflow side division body, Comprising: (a) is a top view, (b) is a side view, (c) is the IIIc part enlarged view of (b). It is sectional drawing which shows a filter. It is the V section enlarged view of Drawing 1, and (a) is a figure showing the state before vibration welding, and (b) is a figure showing the vibration welding completion state.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the following description of preferable embodiment is only an illustration essentially, and is not intending restrict | limiting this invention, its application thing, or its use.

  1A and 1B are views showing an oil strainer 1 according to an embodiment of the present invention, in which FIG. 1A is a plan view, FIG. 1B is a side view, and FIG. 1C is an enlarged sectional view of a portion Ic in FIG. Although not shown, the oil strainer 1 is arranged inside an oil pan below the engine of the vehicle to constitute a part of the lubrication path of the engine, and removes impurities such as dust by filtering the oil.

  The oil strainer 1 includes an elongated, substantially cylindrical case 5 having an oil passage 3 formed therein, and a metal filter 7 for oil filtration disposed in the oil passage 3.

  The case 5 is formed with an oil outlet 9 communicating with the oil flow path 3 at the downstream end (upper end). The case 5 extends from the oil outlet 9 while descending gently and then bent at the bent portion 11. An oil inflow port 13 that extends substantially vertically downward and communicates with the oil flow path 3 is formed at the upstream end (lower end). The oil flowing in from the oil inlet 13 flows upward through the oil passage 3 in the case 5 and flows out from the oil outlet 9.

  The case 5 is divided by a dividing surface 15 that is substantially orthogonal to the cylinder center line at an intermediate portion thereof, and both the substantially cylindrical outflow side tubular body 17 (first tubular body) and inflow side tubular body 19 (second tubular shape). The outflow side tubular body 17 and the inflow side tubular body 19 are formed by vibration welding on the dividing surface 15.

  2A and 2B are views showing the outflow side tubular body 17, wherein FIG. 2A is a plan view, FIG. 2B is a side view, FIG. 2C is an enlarged view of a portion IIc of FIG. 2B, and FIG. FIG. 2 is a sectional view taken along line IId-IId. In FIG. 2B, a substantially upstream half portion of the outflow side tubular body 17 is shown by a cross section cut by a plane passing through the cylinder center line.

  The outflow side tubular body 17 is a resin molded product, and is made of, for example, nylon. The outflow side tubular body 17 has a cylindrical outflow side tubular body main body 21 that forms a downstream portion of the oil flow path 3. The outflow side tubular body 21 extends upwardly from the connection portion with the inflow side tubular body 19 and then bends and extends substantially vertically upward. An annular outflow end flange 23 is radially provided at the downstream end. It protrudes outward. An annular groove 25 is formed on the upper surface of the outflow end flange 23, and an annular gasket 27 (see FIG. 1B) is disposed in the groove 25. The gasket 27 is made of, for example, acrylic rubber (ACM). Further, bosses 29 and 29 through which bolts for fastening and fixing the oil strainer 1 to the engine are formed on both sides of the outflow end flange 23 in a direction orthogonal to the cylinder center line. The outer peripheral edge of each boss 29 and the outer peripheral edge of the outflow end flange 23 are connected by substantially triangular reinforcing ribs 30, 30 that become wider as they approach the outflow end flange 23. Metal collars 28 and 28 (see FIG. 1B) are press-fitted into the bosses 29 and 29 to prevent the bolts from loosening.

  On the other hand, the upstream half portion (lower half portion) of the outflow side tubular body 21 has a diameter larger than that of the downstream half portion (upper half portion). The corresponding part has a larger channel area than the part corresponding to the downstream half part. An annular upstream end flange 31 projecting radially outward is formed at the upstream end of the outflow side tubular body main body 21.

  On the downstream surface 31a of the upstream end flange 31, a pair of ribs 33, 33 connecting the surface 31a and the upstream end outer peripheral surface of the outflow side tubular body 21 are formed at intervals of 180 degrees in the circumferential direction. Has been. The ribs 33 are used for positioning when the outflow side tubular body 17 is set on a jig (not shown) during vibration welding.

  The upstream surface 31b of the upstream end flange 31, that is, the surface facing the inflow side tubular body 19, is welded in an annular shape so as to be orthogonal to the upstream side surface 31b from the outer portion in the center in the width direction. Ribs 35 (welded portions) protrude toward the inflow side tubular body 19. An annular recess 37 having a circular arc cross section is formed on the inner side in the radial direction of the welding rib 35.

  FIGS. 3A and 3B are views showing the inflow side tubular body 19, wherein FIG. 3A is a plan view, FIG. 3B is a side view, and FIG. 3C is an enlarged view of a portion IIIc in FIG. In FIG. 2B, the upstream end portion and the downstream end portion of the inflow side tubular body 19 are shown by a cross section cut by a plane passing through the cylinder center line.

  The inflow side tubular body 19 is a resin molded product, and is made of, for example, nylon. The inflow side tubular body 19 has a cylindrical inflow side tubular body main body 39 that forms the upstream portion of the oil flow path 3. The inflow-side tubular body 39 extends downwardly from the connection portion with the outflow-side tubular body 17 and then bends at the bent portion 11 to extend substantially vertically downward. The oil inlet 13 is formed at the upstream end. Has been. The downstream end portion (upper end portion) of the inflow side tubular body 39 has a diameter larger than the upstream portion, and the portion corresponding to the downstream end portion of the oil flow path 3 is the upstream side. The channel area is larger than the portion corresponding to the portion.

  An annular downstream end flange 41 projecting radially outward is formed at the downstream end (upper end) of the inflow side tubular body main body 39.

  On the upstream surface 41a of the downstream end flange 41, a pair of ribs 43, 43 connecting the surface 41a and the outer peripheral surface of the downstream end portion of the inflow side tubular body 39 are formed at intervals of 180 degrees in the circumferential direction. Has been. The ribs 43 are used for positioning when the inflow side tubular body 19 is set on a jig (not shown) during vibration welding.

  The outer peripheral edge of the surface on the outflow side tubular body 17 side of the downstream end flange 41, that is, the outer peripheral edge of the downstream surface 41 b of the downstream end flange 41 is circular so as to be orthogonal to the downstream surface 41 b. An annular standing wall 45 rises along the cylinder center line. Further, an annular annular convex portion 47 is formed at an inner peripheral edge of the downstream surface 41b, that is, at a position corresponding to the annular concave portion 37 of the outflow side tubular body 17 so as to be orthogonal to the downstream surface 41b. Projecting toward the outflow side tubular body 17. The annular convex portion 47 is accommodated in the annular concave portion 37 projecting from the annular convex portion main body 47a having a rectangular cross section extending from the downstream surface 41b of the downstream end flange 41 and the distal end surface of the annular convex portion main body 47a. And an annular convex tip end portion 47b. The base end width W2 of the annular convex portion distal end portion 47b is narrower than that of the annular convex portion main body 47a, and the width is narrowed as it approaches the distal end.

  FIG. 4 is a sectional view showing the filter 7. The filter 7 has a net shape formed by plain weaving a plurality of metal wires, for example. The said metal wire consists of a copper wire and a steel wire, for example. The filter 7 has a substantially hat shape, covers the oil flow path 3 and removes impurities in the oil, and protrudes outward from the outer peripheral edge of the filtration portion 49 to the outflow side tubular body 17 and A substantially annular flange 51 (fixed portion) sandwiched and fixed by the inflow side tubular body 19.

  As shown in FIG. 1C, the filtering part 49 bulges from the dividing surface 15 toward the downstream side, and the upstream half is cylindrical, and gradually from the cylindrical part toward the downstream side. The diameter is reduced. On the other hand, as shown in FIG. 4, an annular sandwiching portion 53 having a convex cross-section projecting toward the outflow side tubular body 17 is formed in a portion extending from the inner periphery of the flange portion 51 toward the outer peripheral end portion. Is formed. The sandwiching portion 53 is formed along the bottom surface 37a of the annular recess 37 of the outflow side tubular body 17, and its opening width W3 is smaller than the opening width W1 of the annular recess 37 of the outflow side tubular body 17. And it is set larger than the base end width W2 of the cyclic | annular convex part front-end | tip part 47b of the said inflow side tubular body 19. FIG. In addition, an inner annular portion 55 is formed between the narrow portion 53 and the filtering portion 49, and projects from the outer peripheral edge of the sandwich portion 53 to the outer annular portion 57 radially outward. ing. The outer diameter of the outer annular portion 57 is set larger than the outer diameter of the annular recess 37 of the outflow side tubular body 17 and smaller than the welding rib 35.

  The filter 7 is sandwiched and fixed by the outflow side tubular body 17 and the inflow side tubular body 19 at locations where the outer peripheral edge thereof corresponds to the dividing surface 15 of the case 5. This sandwiched and fixed state will be described with reference to FIG. 5A and 5B are enlarged views of a portion V in FIG. 1C, where FIG. 5A is a diagram showing a state before vibration welding, and FIG. 5B is a diagram showing a vibration welding completion state.

  That is, the distal end portion of the welding rib 35 of the outflow side tubular body 17 is welded to a portion between the annular convex portion 47 and the standing wall portion 45 on the downstream surface 41 b of the downstream end flange 41 of the inflow side tubular body 19. doing. The sandwiching portion 53 of the filter 7 is accommodated in the annular recess 37 of the outflow side tubular body 17, and the inner annular portion 55 on the radially inner side of the sandwiching portion 53 is the outflow side tubular body 17. A portion between the annular recess 37 of the upstream surface 31b and the welding rib 35, the outer annular portion 57 being in contact with the inner peripheral edge of the upstream surface 31b and radially outside the sandwiching portion 53. Abut. And the annular convex part front-end | tip part 47b of the said inflow side tubular body 19 facing the said annular recessed part 37 fits in the said clamping part 53, and is clamped and fixed with the upstream surface 31b of the said upstream end flange 31. FIG. In this state, the standing wall portion 45 is in contact with the outer peripheral edge portion of the downstream surface 31a of the upstream end flange 31 of the outflow side tubular body 17, so that molten resin debris is not generated by vibration welding. In order to prevent molten resin debris generated by the ribs 35 from coming out, they are opposed to each other with a slight gap S1. Further, in this state, a gap S <b> 2 is formed between the sandwiched portion 53 and the bottom surface 37 a of the annular recess 37, and the annular convex tip end portion 47 b of the annular convex portion 47 and the narrow portion 53. A gap S3 is formed in the width direction.

  Next, the procedure for manufacturing the oil strainer 1 will be described with reference to FIG.

  First, the filtering part 49 of the filter 7 is inserted into the outflow side tubular body 17, and the sandwiching part 53 of the filter 7 is accommodated in the annular recess 37 of the outflow side tubular body 17. At this time, the inner annular portion 55 of the filter 7 abuts on the inner peripheral edge of the upstream surface 31b of the outflow side tubular body 17, and the outer annular portion 57 of the filter 7 is an annular recess 37 of the upstream surface 31b. And the weld rib 35. Accordingly, in this state, a gap S <b> 2 is formed between the sandwiching portion 53 of the filter 7 and the bottom surface 37 a of the annular recess 37.

  Next, the outflow side tubular body 17 and the inflow side tubular body 19 to which the filter 7 is attached are set in a vibration welding machine (not shown). At this time, the tubular bodies 17 and 19 are positioned by the ribs 33 and 33 and the ribs 43 and 43, respectively, and the welding rib 35 of the outflow side tubular body 17 is connected to the inflow side tubular body 19 as shown in FIG. The downstream end 41 b of the downstream end flange 41 is pressed against the downstream surface 41 b, and the annular convex tip end 47 b of the inflow side tubular body 19 is spaced from the top of the sandwiched portion 53 in the sandwiched portion 53 of the filter 7. Housed in state.

  Next, the vibration welding machine is operated to vibrate one tubular body in a direction perpendicular to the cylinder center line with respect to the other tubular body. At this time, a gap is formed between the annular convex end portion 47b of the inflow side tubular body 19 and the sandwiching portion 53 of the filter 7, and they are not in contact with each other.

  Subsequently, the tip of the welding rib 35 of the outflow side tubular body 17 is melted by frictional heat due to vibration, and the outflow side tubular body 17 and the inflow side tubular body 19 approach each other, as shown in FIG. 5B. When the annular convex tip end portion 47b of the inflow side tubular body 19 comes into contact with the clamping portion 53 of the filter 7, the vibration stops. At this time, the annular convex tip end portion 47 b abuts on the sandwiching portion 53 of the filter 7, but it is possible to prevent the annular convex tip end portion 47 b from being scraped by the gap S <b> 2 being a deflection allowance of the sandwiching portion 53.

  In addition, since the annular protrusion tip 47b is only brought into contact with the sandwiching portion 53 of the filter 7, a large reaction force that separates the tubular bodies 17, 19 from the sandwiching portion 53 to the tubular bodies 17, 19 is obtained. Does not work. Therefore, the welding rib 35 can be sufficiently pressed against the inflow side tubular body 19 during vibration welding.

  Further, the resin melted from the front end portion of the welding rib 35 is blocked by the annular convex portion 47 inside thereof. Therefore, it is possible to prevent the molten resin from flowing into the oil flow path 3. The molten resin is also dammed by the standing wall portion 45 outside the welding rib 35. For this reason, the molten resin does not leak into the outside of the case 5 and is not mixed into the oil, and the appearance of the oil strainer 1 is not impaired.

  When the molten resin of the welding rib 35 is solidified and the welding rib 35 is welded to the downstream end flange 41 of the inflow side tubular body 19, the outflow side tubular body 17 and the inflow side tubular body 19 are welded to each other. The sandwiching portion 53 of the filter 7 is sandwiched and fixed by the annular convex portion 47 of the inflow side tubular body 19 and the upstream surface 31 b of the outflow side tubular body 17.

  In this state, the sandwiching portion 53 of the filter 7 is fitted into the annular recess 37 of the outflow side tubular body 17, and the annular projection tip end portion 47 b of the inflow side tubular body 19 is fitted into the sandwiching portion 53. Yes. Therefore, even if oil flows through the oil flow path 3, the filtering part 49 of the filter 7 is pushed downstream by the oil, and the clamping part 53 at the outer peripheral edge of the filtering part 49 is pulled inward, the Since the radially inner portion is caught by the bottom surface 37 a of the annular recess 37 and the radially outer portion of the sandwiched portion 53 is caught by the annular projecting portion 47, the sandwiched portion 53 is not detached from the annular recess 37. Therefore, the filter 7 does not come off from the case 5.

-Effects of the embodiment of the invention-
According to the above-described embodiment, both the tubular bodies 17 and 19 are joined by vibration welding, and the sandwiching portion 53 that is a part of the fixing portion 51 of the filter 7 is accommodated in the annular recess 37 of the outflow side tubular body 17. In the state in which the fixing portion 51 is sandwiched and fixed by the annular convex portion 47 of the inflow side tubular body 19 and the upstream surface 31b of the outflow side tubular body 17, the annular convex portion tip portion 47b and the sandwiching portion 53 have a width direction. A gap S3 is formed in the gap. Therefore, at the time of vibration welding, the annular convex portion distal end portion 47 b does not hit the sandwiched portion 53 fitted along the bottom surface 37 a of the annular concave portion 37. Therefore, the annular protrusion 47 is not scraped by the metal filter 7, and the generation of resin pieces can be prevented. At the same time, since the sandwiching portion 53 of the filter 7 does not hit the annular convex portion 47 of the inflow side tubular body 19, the end of the metal wire forming the filter 7 is not loosened, and the generation of metal pieces can be prevented. .

  Further, in the above embodiment, the sandwiched portion 53 of the filter 7 is fitted into the annular recess 37 of the outflow side tubular body 17, and the annular convex portion tip portion 47 b of the inflow side tubular body 19 is fitted into the sandwiched portion 53. It is out. Therefore, even if oil flows through the oil flow path 3, the filtering part 49 of the filter 7 is pushed by the oil, and the clamping part 53 at the outer peripheral edge of the filtering part 49 is pulled inward, the radially inner side of the clamping part 53 Since the portion is caught by the bottom surface 37a of the annular recess 37 and the radially outer portion of the sandwiching portion 53 is caught by the annular projection 47, the sandwiching portion 53 is the surface of the outflow side tubular body 17 on the inflow side tubular body 19 side. It does not deviate from 31b. Therefore, it is possible to prevent the filter 7 from coming off the case 5.

  Furthermore, according to the above-described embodiment, since the sandwiching portion 53 is caught as described above, the sandwiching portion 53 is not detached from the surface 31b of the outflow side tubular body 17 on the inflow side tubular body 19 side. The fixing portion 51 is strongly pressed by the outflow side tubular body 17 and the inflow side tubular body 19, and it is not necessary to firmly hold the fixing portion 51, and both the tubular bodies 17, 19 are connected from the clamping portion 53 to both the tubular bodies 17, 19. The large reaction force that separates them from each other does not act. Therefore, the welding rib 35 can be sufficiently pressed against the upstream end flange 41 of the counterpart inflow side tubular body 19 during vibration welding. Therefore, it is possible to realize welding with high airtightness.

  In the above embodiment, the outflow side pipe body 17 is the first tubular body, and the inflow side pipe body 19 is the second tubular body. However, the shape of the dividing surface 15 is the protrusion of the sandwiching portion 53 of the filter 7. The outflow side pipe body 17 may be formed in the shape of the second tubular body, and the inflow side pipe body 19 may be formed in the shape of the first tubular body by reversing the direction.

  Moreover, in the said embodiment, although the welding rib 35 is provided only in the outflow side tubular body 17, it is not limited to this, You may provide only in the inflow side tubular body 19, or both the tubular bodies 17, 19 may be provided.

  As described above, the oil strainer according to the present invention can be applied to an application that realizes highly airtight welding while preventing generation of resin pieces and metal pieces during vibration welding.

DESCRIPTION OF SYMBOLS 1 Oil strainer 3 Oil flow path 5 Case 7 Filter 9 Oil outflow port 13 Oil inflow port 15 Dividing surface 17 Outflow side tubular body (first tubular body)
19 Inflow side tubular body (second tubular body)
31b The upstream surface of the upstream end flange (the surface facing the counterpart tubular body in one tubular body)
35 Welding rib (welded part)
37 annular recess 37a bottom surface 41b of annular recess downstream surface of downstream end flange (surface of second tubular body on first tubular body side)
47 annular projection 47b annular projection tip (tip of annular projection)
49 Filtration part 51 ridge part (fixing part)
53 Clamping part S3 Crevice (gap between the tip of the annular convex part and the clamping part)

Claims (1)

An oil inlet (13) and an oil outlet (9) are formed at one end and the other end, respectively, and an oil flow path (3) is formed between the both ends, and flows from the oil inlet (13). And a cylindrical resin case (5) through which the oil flows out from the oil outlet (9) through the oil passage (3), and an oil filter disposed in the oil passage (3). The case (5) includes a first tubular body (17) and a second tubular body (19) divided by a dividing surface (15) intersecting the cylinder center line at an intermediate portion thereof. The first tubular body (17) and the second tubular body (19) are formed by vibration welding at the dividing surface (15), while the outer peripheral edge of the filter (7) is An oil strainer clamped and fixed by the first tubular body (17) and the second tubular body (19) at a location corresponding to the dividing surface (15),
The filter (7) has a net shape composed of a plurality of metal wires, and the filter part (49) that covers the oil flow path (3) and projects outward from the outer peripheral edge of the filter part (49). An annular fixing portion (51) sandwiched and fixed by the first tubular body (17) and the second tubular body (19),
The fixing portion (51) is provided with an annular sandwiching portion (53) having a convex cross-section projecting toward the first tubular body (17),
The surface (31b) of the at least one tubular body (17) facing the counterpart tubular body (19) protrudes toward the counterpart tubular body (19), and the distal end portion of the counterpart tubular body (19) An annular welded portion (35) that is vibration welded to the tubular body (19) is provided,
On the inner side of the welded portion (35) in the surface (31b) of the first tubular body (17) on the second tubular body (19) side, a cross-sectional concave corresponding to the cross-sectional convex shape of the sandwiched portion (53) While an annular recess (37) is formed to accommodate the sandwiching part (53) in a shape,
A portion corresponding to the annular recess (37) on the surface (41b) of the second tubular body (19) on the first tubular body (17) side protrudes toward the first tubular body (17). An annular convex portion (47) facing the sandwiched portion (53) is formed,
The tip (47b) of the annular convex part (47) is such that the welded part (35) is vibration welded to the counterpart tubular body (19), and the fixing part (51) is the annular convex part (47). ) And the surface (31b) of the first tubular body (17) on the second tubular body (19) side, and is accommodated in the narrowed portion (53) and held in the narrowed portion (53). An oil strainer characterized in that the gap (S3) is formed narrower than the width of the sandwiched portion (53) so that a gap (S3) is formed in the width direction.

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