JP2009287517A - Strainer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact strainer having excellent mounting work efficiency and suppressing circulation resistance while storing a filter having a wide filtration effective area and extending the service life. <P>SOLUTION: This strainer 1 is so configured that liquid is led to flow from an inflow hole 46, passed through the filter 2, and led to flow out from the inside of an outflow pipe portion 31. The outflow pipe portion 31 is formed with a mounting flange portion 32 fastened by a fastening member and projecting in the radial direction of a connection 31a. A filter storage portion 33 to surround the solid portion 21 of the filter 2 is formed on the side of the outflow pipe portion 31. The filter storage portion 33 is provided with tool avoidance wall portions for avoiding interference with a tool T for the fastening member and channel enlargement wall portions for enlarging a channel in the filter storage portion 33. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a strainer for filtering fluid.

  In general, in a vehicle engine, in order to lubricate or cool each part of the engine, oil stored in an oil pan provided in the lower part of the engine is sucked up by an oil pump and supplied to each part of the engine. A strainer is disposed in the oil pan so as to filter the oil sucked up by the oil pump.

As this type of strainer, there is known a strainer having a cylindrical filter and a case for housing the filter, as in Patent Document 1. This cylindrical filter has a mesh portion in which a large number of mesh pores are formed in a cylindrical three-dimensional shape portion. Further, the case is provided with a plate-like flange on the oil outlet side, and is attached to the engine with a fastening member such as a bolt.
Japanese Patent Laid-Open No. 2002-210310

  By the way, the strainer is a component that is hardly removed after being attached to the engine except in the case of breakage or the like. Therefore, as a structure of the strainer, it is required to accommodate a filter having a mesh portion as wide as possible, to prevent clogging due to clogging, and to extend the service life. By using a filter having a three-dimensional shape portion, it is possible to satisfy the demand for longer life.

  Further, in recent years, due to the pursuit of miniaturization of the engine, it has become necessary to dispose a strainer in an oil pan having a shallow oil reservoir, and further downsizing of the strainer is also required.

  On the other hand, a method of bringing the strainer as compact as possible by bringing the mesh portion of the filter as close as possible to the outlet side in the case is conceivable. However, when the filter has a three-dimensional shape as in Patent Document 1, the outer shape of the case on the outlet side becomes larger as the filter has a three-dimensional shape. If the outer shape of the case on the outlet side becomes large, when the strainer is attached to the engine, the flange is on the outlet side of the case, so the tool for the fastening member interferes with the outer surface of the case. If an attempt is made to reduce the outer shape of the case on the outlet side in order to avoid this, the three-dimensional mesh portion of the filter and the inner surface of the case approach each other, increasing the oil flow resistance.

  The present invention has been made in view of such points, and the object of the present invention is to reduce the flow resistance while accommodating a filter having a wide filtration effective area and extending its life, and is compact and excellent. An object of the present invention is to provide a strainer having mounting workability.

  In order to achieve the above object, in the present invention, a filter having a mesh part for filtering liquid, an inflow hole forming part for forming an inflow hole through which liquid flows, and an outflow hole forming for forming an outflow hole through which liquid flows out are formed. A strainer configured to allow the fluid flowing in from the inflow hole to pass through the mesh portion and to flow out of the outflow hole, and the outflow hole The forming portion is formed so that the fastening portion fastened by the fastening member protrudes in the radial direction of the outflow hole, and the filter housing portion surrounding the mesh portion of the filter is formed on the outflow hole forming portion side of the case The mesh portion of the filter is formed to have a three-dimensional shape that swells in the fluid flow direction, and is disposed in the filter housing portion, and the filter housing portion has interference with a tool for a fastening member. Times A tool avoidance wall for enlarging and a channel enlarging wall for enlarging the channel in the case are provided adjacent to each other in the circumferential direction surrounding the mesh portion, and an inner surface of the channel enlarging wall The distance between the mesh portion facing the inner surface is set to be longer than the distance between the inner surface of the tool avoidance wall portion and the mesh portion facing the inner surface.

  According to the said invention, since the mesh part of the filter was made into the solid shape, it can be set as the strainer with a wide effective filtration area. Moreover, since the mesh part of the filter is disposed in the filter housing part formed on the outlet side of the case, the strainer can be made compact. And although it is as mentioned above, since the tool avoidance wall part which avoids interference with the tool for fastening members is provided in the filter accommodating part of a case, workability | operativity is good when attaching a strainer to an engine etc., for example. . Further, a flow passage expanding wall portion is formed in the filter housing portion of the case, and the separation distance between the inner surface of the flow passage expanding wall portion and the mesh portion facing the inner surface is opposed to the inner surface of the tool avoidance wall portion and the inner surface. Since it is longer than the separation distance from the mesh part, it is possible to secure a wide channel cross-sectional area through which the fluid that passes through the mesh part and flows out to the outlet side of the case passes, and keeps the flow resistance of the fluid in the case low. Can do. As a result, it is possible to obtain a strainer that has a three-dimensional filter with a wide effective filtration area and that has a long life while keeping flow resistance low and that is compact and has excellent mounting workability. .

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.
Embodiment 1 of the Invention
FIG. 1 is a perspective view of a strainer 1 according to Embodiment 1 of the present invention. As shown in FIG. 2, the strainer 1 includes a filter 2 that filters oil, a main body 3 that houses the filter 2, and a main body. An inlet member (inflow hole forming portion) 4 coupled to the lower end side of the portion 3 is formed, and the main body portion 3 and the inlet member 4 constitute a case 10. The strainer 1 is disposed in an oil pan (not shown) of an automobile engine Ec (see FIG. 5), and is used as a part of the lubrication path of the engine. After being filtered at, it is supplied from the upper side to the downstream side of the lubrication path.

  In the following description, for convenience of explanation, unless otherwise indicated, “upper” and “lower” mean the upper and lower sides of the strainer 1 as shown in the respective drawings, and “left” and “right” "Means the left and right sides of the strainer 1 as shown in each figure, and" front "and" rear "means the front side and rear side of the strainer 1 as shown in each figure.

  The filter 2 is an injection molded product of a resin material, and is formed by a three-dimensional shape portion 21 and a flange 22 as shown in FIGS. The three-dimensional shape portion 21 is formed in a rectangular tube shape that opens downward and swells upward, and has a center line extending in the vertical direction. On the left and right of the three-dimensionally shaped portion 21, a substantially rectangular and flat left mesh portion 21a and right mesh portion 21b are arranged substantially parallel to the center line as shown in FIG. Further, a front mesh part 21c and a rear mesh part 21d having a substantially rectangular shape and a flat shape are disposed substantially parallel to the center line before and after the three-dimensionally shaped part 21, as shown in FIG. And the upper side mesh part 21e of the substantially rectangular and flat shape is provided so that the upper end of the part enclosed by the mesh parts 21a-21d of the solid-shaped part 21 may be plugged up. The dimension in the front-rear direction of the three-dimensional shape portion 21 is set longer than the dimension in the left-right direction. The mesh portions 21a to 21e are reinforced by ribs 21f (shown only in FIG. 2).

  The flange 22 is formed so that the entire periphery of the flange 22 extends toward the outside of the three-dimensional shape portion 21 at the peripheral edge of the lower end of the three-dimensional shape portion 21. And the outer periphery shape of the flange 22 is a shape corresponding to the inner periphery shape of the lower end part of the filter accommodating part 33 mentioned later.

  The main body 3 is an injection-molded product of a resin material. As shown in FIG. 1, the outflow pipe portion (outflow hole forming portion) 31 provided in the upper portion and the attachment flange portion 32 provided in the outflow pipe portion 31. (Fastening portion), a filter housing portion 33 connected below the outflow pipe portion 31, and an inlet member mounting portion 34 provided at the lower portion of the filter housing portion 33.

  As shown in FIG. 1 to FIG. 3, the outflow pipe portion 31 is a circular tube-shaped portion that extends on a straight line with an inclination angle of about 45 degrees and has an open end located on the upper front side. The lower end portion of the outflow pipe portion 31 is opened in a rectangular shape that is long in the front-rear direction, and is connected to the upper end of the filter housing portion 33. An outflow hole 31b having a diameter D31 is formed inside the outflow pipe portion 31, and the outflow hole 31b communicates with the inside of the filter housing portion 33.

  An annular connecting portion 31a is provided at the upper end portion of the outflow pipe portion 31, and is connected to a predetermined position of the engine Ec as shown in FIG. As shown in FIG. 1, the mounting flange portion 32 has a plate shape extending in the radial direction of the connection portion 31 a around the connection portion 31 a. The attachment flange portion 32 has a substantially rhombus shape when viewed in the direction of the central axis of the connection portion 31a, and protrudes symmetrically with respect to the central axis of the connection portion 31a in the diagonally upper right and the diagonally lower left. A notch 32 c is formed on the upper left of the mounting flange 32. A right through hole 32a that is parallel to the central axis of the connecting portion 31a is provided at a substantially central portion of the mounting flange portion 32 that protrudes obliquely to the upper right, and the right bush P1 is fitted into the right through hole 32a. In addition, a left side through hole 32b that is parallel to the central axis of the connection portion 31a is provided at the approximate center of the portion of the mounting flange portion 32 that projects obliquely to the lower left, and the left side bush P2 is fitted into the left side through hole 32b. Yes. And as shown in FIG. 5, the volt | bolt B can be penetrated to bush B1, P2 from the filter accommodating part 33 side.

  As shown in FIG. 4, the left wall portion 33a and the right wall portion 33b of the filter housing portion 33 have a flat shape and extend in parallel with each other in the vertical direction, and both the front wall portion 33c and the rear wall portion 33d have a flat shape. The space in the filter accommodating portion 33 formed by being surrounded by the wall portions 33 a to 33 d communicates with the outflow hole 31 b in the outflow pipe portion 31. On the other hand, as shown in FIG. 1 and FIG. 2, the lower part of the filter housing portion 33 has an outer shape that smoothly expands downward and is connected to the inlet member mounting portion 34. The positional relationship when the filter 2 is accommodated in the filter accommodating portion 33 is such that the upper mesh portion 21e of the filter 2 is located at the upper end of the filter accommodating portion 33 as shown in FIG.

  As shown in FIG. 4, the inner surface of the left wall 33a of the filter housing portion 33 and the left mesh portion 21a of the filter 2 are opposed, and similarly, the inner surface of the right wall portion 33b and the right mesh portion 21b are opposed. The inner surface of the front wall portion 33c and the front mesh portion 21c face each other, and the inner surface of the rear wall portion 33d and the rear mesh portion 21d face each other. The filter housing portion 33 is longer in the front-rear direction than in the left-right direction, and the separation distance d1 between the inner surface of the left wall portion 33a and the left mesh portion 21a, the inner surface of the right wall portion 33b, and the right mesh portion. The separation distance d2 between the inner surface of the front wall 33c and the front mesh portion 21c and the separation distance d4 between the inner surface of the rear wall portion 33d and the rear mesh portion 21d are equal to the separation distance d2 between the front wall portion 33c and the rear mesh portion 21d. The distances d3 and d4 are longer than the distances d1 and d2.

  As shown in FIG. 5, when fastening the bolt B, the tool T passes through the side of the left wall portion 33a or the right wall portion 33b, and the left wall portion does not interfere with the tool T. 33a and the right wall part 33b are formed. The left wall portion 33a and the right wall portion 33b are tool avoidance wall portions. Further, the flow resistance when the oil passes through the filter 2 and flows between the inner surface of the front wall portion 33c and the front mesh portion 21c and between the inner surface of the rear wall portion 33d and the rear mesh portion 21d is low. The front wall portion 33c and the rear wall portion 33d are formed so that the separation distances d3 and d4 are sufficiently long so as to be suppressed. The front wall portion 33c and the rear wall portion 33d are flow channel expanding wall portions. At this time, in order to keep the flow resistance of the oil flowing in the main body 3 lower, in the relationship between the separation distances d3 and d4 and the diameter D31 in the outflow hole 31b, d3 and d4 are longer than half of D31. Preferably, the front wall portion 33c and the rear wall portion 33d are formed. Furthermore, the minimum separation distance ds between the upper wall portion 31c of the outflow pipe portion 31 and the upper mesh portion 21e is such that even if the upper mesh portion 21e is blocked with dust or the like, an oil circulation path can be secured. The main body 3 is preferably formed so as to be longer than d3 and d4.

  In the inflow member mounting portion 34, a portion where the outer peripheral shape is larger than the peripheral edge of the lower end portion of the filter housing portion 33 and a portion where the outer peripheral shape is larger than that portion are stepped downward. Is formed. As shown in FIG. 3, a stepped portion 34 a into which the inlet member 4 is fitted is provided on the inner periphery of the inlet member mounting portion 34, and the stepped portion 34 a holds the upper peripheral edge of the flange 22. A filter holding surface 34b to be welded to the inlet member 4, and a lower end surface 34d to the lower end of the filter holding surface 34b. .

  As shown in FIG. 2, the inlet member 4 is an injection molded product of a resin material, and is a member fitted to the lower side of the main body portion 3 having an inflow hole 46 for sucking oil. As shown in FIGS. 2 and 3, the upper part of the inlet member 4 is formed with a filter holding ridge 43 projecting upward in the circumferential direction of the inlet member 4, and this filter holding ridge part. The outer peripheral shape of 43 is a shape corresponding to the inner peripheral shape of the stepped portion 34 a in the inlet member attaching portion 34. On the inner periphery of the filter holding ridge 43, a filter support ridge 42 is formed along the filter holding ridge 43 to support the periphery of the opening of the three-dimensional shape portion 21 from below.

  As shown in FIG. 3, the filter holding projection 43 is located between the filter holding surface 34 b when the filter 2 is accommodated in the main body 3 and the inlet member 4 is fitted into the main body 3. The outer peripheral edge of the flange 22 is fixed over the entire periphery.

  On the outer periphery of the inlet member 4, a fitting portion 44 that fits into the step portion 34 a is formed over the entire circumference along the step portion 34 a. The fitting portion 44 is provided with a welding surface 44a facing the welding surface 34c and a fitting surface 44b facing the lower end surface 34d over the entire circumference.

  An inflow portion 45 is provided in the center of the inlet member 4. A circular suction port 45 a for sucking oil is formed at the lower end of the inflow portion 45. The lower side of the inflow portion 45 protrudes further below the lower end surface 44 c of the fitting portion 44. The outer shape of the inflow portion 45 is substantially circular, and is formed so as to gradually increase from the suction port 45a toward the upper side.

  The inflow hole 46 of the inflow port member 4 communicates with the inside of the filter housing portion 33, and the shape thereof is such that the lower end opening of the three-dimensional shape portion 21 gradually decreases toward the lower side, and eventually becomes the shape of the suction port 45 a. Shaped to match.

  Next, the assembly of the strainer 1 will be described. First, after inserting the filter 2 from the lower side of the main body 3, the fitting portion 44 of the inlet member 4 is aligned with the stepped portion 34 a of the main body 3, thereby fitting the inlet member 4 to the main body 3. Let Then, the main-body part 3 and the inflow port member 4 are welded and integrated by the ultrasonic welding method. That is, the main body 3 is held by a jig or the like (not shown), a horn (not shown) is brought into contact with the lower end surface 44c of the inlet member 4, and the inlet member 4 is moved to the main body 3 side. While pressing, the horn is ultrasonically vibrated by a vibrator (not shown), whereby the welding surface 34c and the welding surface 44a are melted by frictional heat, and the main body 3 and the inlet member 4 are welded. At this time, the filter 2 is fixed by sandwiching the outer peripheral edge of the flange 22 of the filter 2 between the filter holding surface 34 b and the filter holding protrusion 43.

  Next, attachment of the strainer 1 to the engine Ec will be described. As shown in FIG. 5, the strainer 1 is installed at a predetermined position of the engine Ec. Then, the bolt B is inserted into the right bush P1 and the left bush P2 of the mounting flange portion 32, and the bolt B is screwed into the screw hole on the engine Ec side with a fastening tool T such as a socket wrench to attach the strainer 1. . At this time, the left wall portion 33a and the right wall portion 33b of the filter housing portion 33 are formed at positions where they do not interfere with the fastening member tool T on the protruding side of the mounting flange portion 32. When attaching to Ec, the tool T does not contact the main body 3.

  Next, the flow of oil in the strainer 1 will be described. When the strainer 1 is attached to the engine Ec, the lower portion of the strainer 1 is in a position to be immersed in the oil in the oil pan. When the pump which is a part of the lubricating circuit is activated, oil is sucked up from the inlet hole 46 of the inlet member 4. The sucked oil passes through the mesh portions 21a to 21e of the filter 2 from the inside toward the outside and is filtered. The oil that has passed through the mesh portions 21a to 21e flows upward through the filter housing portion 33, passes through the outflow hole 31b in the outflow pipe portion 31, and is supplied to each part of the engine. At this time, as shown in FIG. 4, the filter accommodating portion 33 includes a separation distance d3 between the inner surface of the front wall portion 33 c and the front mesh portion 21 c of the filter 2, and the inner surface of the rear wall portion 33 d and the rear of the filter 2. Since the front wall portion 33c and the rear wall portion 33d are formed so that the separation distance d4 between the side mesh portion 21d is sufficiently long, a wide flow path is ensured, and the oil flows from the inside to the outside through the filter 2. The distribution resistance at the time is kept low.

  As mentioned above, according to the strainer 1 which concerns on this Embodiment 1, since the solid-shaped part 21 comprised by the mesh was provided in the filter 2, the filtration effective area can be widened. Moreover, since the three-dimensionally shaped portion 21 of the filter 2 is disposed in the filter housing portion 33 while the filter housing portion 33 is disposed at a position close to the mounting flange portion 32, the strainer 1 can be made compact. And although it did as mentioned above, since the left wall part 33a and the right wall part 33b of the filter accommodating part 33 were formed so that interference with the tool T for fastening members might be avoided, the strainer 1 is assembled | attached to an engine. At this time, the tool T does not interfere with the strainer 1 and the workability is good. Furthermore, since the filter accommodating portion 33 is formed so that the distance between the front wall portion 33c and the rear wall portion 33d and the filter 2 is sufficiently long, the flow resistance when oil flows can be kept low, Oil can flow smoothly in the strainer 1. Thereby, by accommodating the filter 2 of the three-dimensionally shaped portion 21 having a wide filtration effective area in the case 10, it is possible to reduce the flow resistance and to make it compact while extending the life, and further, the mounting workability Can be improved.

  In addition, you may make the outflow pipe part 51 of the strainer 1 into the linear form in the front-back direction like the modification 1 of Embodiment 1 shown in FIG. That is, it is set as the structure which has the outflow pipe part 51 extended in the front-back direction at the upper end side of the main-body part 5. As shown in FIG. The outflow pipe part 51 is a circular pipe-shaped part having an open end located at the front. The lower end side from the middle part to the rear end part of the outflow pipe part 51 is open and is connected to the filter housing part 53.

  An annular connection portion 51a is provided at the front end portion of the outflow pipe portion 51, and a plate-like attachment flange portion 52 that extends in the radial direction of the connection portion 51a is provided around the connection portion 51a. The attachment flange portion 52 has a substantially rhombus shape when viewed in the direction of the central axis of the connection portion 51a, and protrudes symmetrically with respect to the central axis of the connection portion 51a in the diagonally lower right and the diagonally upper left. . A notch 52 c is formed at the lower left of the mounting flange 52. A right through hole (not shown) is provided in the approximate center of the portion of the mounting flange portion 52 that projects obliquely to the lower right, and a right bush (not shown) is fitted into the right through hole. Further, a left side through hole 52b is provided substantially at the center of the portion of the mounting flange portion 52 that protrudes obliquely to the upper left, and the left side bush P2 is fitted into the left side through hole 52b.

  As described above, by making the outflow pipe of the strainer 1 linear in the front-rear direction, it is possible to cope with a change in the position where the strainer 1 is attached in the oil pan.

  Moreover, you may make it the shape which connects the outflow pipe | tube part 61 of the strainer 1 to the front upper side of the filter accommodating part 63 which accommodates the filter 2 like the modification 2 of Embodiment 1 shown in FIG. .

  The outflow pipe portion 61 is open at the front end, and as shown in FIG. 8, an outflow hole 61b having a diameter D61 is formed inside. An annular connecting portion 61a is provided at the front end portion of the outflow pipe portion 61, and a plate-like mounting flange portion 62 that extends in the radial direction of the connecting portion 61a is provided around the connecting portion 61a. The attachment flange portion 62 has a substantially elliptical shape when viewed in the direction of the central axis of the connection portion 61a, and protrudes left and right with respect to the central axis of the connection portion 61a. A right through hole 62a is provided in the approximate center of the portion protruding to the right side of the mounting flange 62, and a left through hole 62b is provided in the approximate center of the portion protruding to the left side. Bolts B can be inserted into the through holes 62a and 62b together with a bush (not shown).

  As shown in FIG. 7, the filter accommodating part 63 is a substantially rectangular tube shape extended in an up-down direction, and the dimension is formed long before and behind rather than right and left. The filter housing part 63 is shaped so that the width in the front-rear direction gradually decreases in the upward direction from the part where the outflow pipe part 61 is connected. The positional relationship when the filter 2 is accommodated in the filter accommodating portion 63 is such that the upper mesh portion 21e of the filter 2 is located on the central axis of the outflow pipe portion 61, as shown in FIG.

  The front wall portion 63c of the filter accommodating portion 63 and the front mesh portion 21c of the filter 2 are opposed to each other. Similarly, the rear wall portion 63d and the rear mesh portion 21d are opposed to each other, and the upper wall portion 63e and the upper mesh portion are opposed to each other. 21e is facing. The separation distance d5 between the inner surface of the upper wall portion 63e and the upper mesh portion 21e is the separation distance d6 between the inner surface of the front wall portion 63c and the front mesh portion 21c, and the inner surface and the rear mesh portion of the rear wall portion 63d. The upper wall portion 63e is formed at a position longer than the distance 21d and the separation distance d7, and even when the upper mesh portion 21e is blocked with dust or the like, a sufficient oil circulation path can be secured. . Further, in order to keep the flow resistance of the oil flowing through the main body 6 lower, the relationship between the separation distances d6 and d7 and the diameter D61 at the outflow hole 61b is such that d6 and d7 are longer than half of D61. It is preferable that the front wall portion 63c and the rear wall portion 63d are formed.

  By changing the position of the outflow pipe portion 61 provided in the strainer 1 as described above, the shape of the main body portion 6 can be set to match the space in the oil pan.

  Further, as in Modification 3 of Embodiment 1 shown in FIGS. 9 to 10, the upper mesh portion 71e is inclined rearward and upward at the upper end portion of the filter 7 of the strainer 1, and the filter accommodating portion 83 is adjusted accordingly. The shape may be changed.

  That is, as shown in FIG. 10, the upper end portion of the rear mesh portion 71d in the three-dimensional shape portion 71 of the filter 7 protrudes above the upper end portion of the front mesh portion 71c.

  The outflow pipe portion 81 is a substantially circular tube-shaped portion protruding forward from the front wall of the filter housing portion 83, and has an outflow hole 81b having a diameter D81 inside. The upper wall portion 83e of the filter accommodating portion 83 has a shape that is gradually positioned upward toward the rear side. The front wall portion 83c of the filter housing portion 83 and the front mesh portion 71c of the filter 7 face each other. Similarly, the rear wall portion 83d and the rear mesh portion 71d face each other, and the upper wall portion 83e and the upper mesh portion. 71e faces. The upper wall portion 83e has a separation distance d8 between the inner surface of the upper wall portion 83e and the upper mesh portion 71e, a separation distance d9 between the inner surface of the front wall portion 83c and the front mesh portion 71c, and the inner surface of the rear wall portion 83d. And a distance d10 between the rear mesh portion 71d and the rear mesh portion 71d. At this time, the upper wall portion 83e is formed so that the separation distance d8 is longer than d9 and d10 so that the oil circulation path can be secured even if the upper mesh portion 71e is blocked with dust or the like. Is preferred. Further, in order to keep the flow resistance of the oil flowing in the main body part 8 lower, in the relationship between the separation distances d9 and d10 and the diameter D81 in the outflow hole 81b, d9 and d10 are longer than half of D81. It is preferable that the front wall portion 83c and the rear wall portion 83d are formed.

  As described above, by deforming the outer shape of the strainer 1 and the shape of the filter portion, the effective filtration area of the filter 7 is further increased while keeping the oil flow resistance low while maintaining the shape that matches the space in the oil pan. Can be wide.

  In the first embodiment, the suction port 45a is arranged at the center of the inlet member 4. However, the suction port 45a may be arranged at the front or rear, or the central axis of the suction port 45a is inclined. Good.

Moreover, although the strainer 1 has the main body 3 and the inlet member 4 in a divided structure, it may be an integrally molded product.
<< Embodiment 2 of the Invention >>
FIG. 11 is a perspective view of a strainer 9 according to Embodiment 2 of the present invention. As shown in FIG. 12, the strainer 9 includes a filter 11 that filters oil, a main body portion 12 that houses the filter 11, and a main body. An inlet member 13 coupled to the lower end side of the portion 12 is formed, and a case 14 is constituted by the main body portion 12 and the inlet member 13.

  The filter 11 is an injection molded product of a resin material, and is formed by a three-dimensional shape portion 111 and a flange 112. As in the first embodiment, the three-dimensionally shaped portion 111 includes a left mesh portion 111a, a right mesh portion 111b, a front mesh portion 111c, a rear mesh portion 111d, and an upper mesh portion 111e. The mesh portions 111a to 111e are reinforced by ribs 111f.

  The flange 112 is formed so that the entire periphery of the flange 112 extends toward the outside of the three-dimensional shape portion 111 at the lower end peripheral portion of the three-dimensional shape portion 111. The outer periphery of the flange 112 is curved in such a way that the center of the left edge is curved toward the right side, the center of the right edge is curved toward the left side, the center of the front edge is curved forward, and the center of the rear edge is rearward It has a curved shape. And the outer periphery shape of the flange 112 becomes a shape corresponding to the inner periphery shape of the lower end part of the filter accommodating part 123 mentioned later.

  The main body portion 12 is an injection-molded product of a resin material. The outflow pipe portion 121 provided at the upper portion, the mounting flange portion 122 provided at the upper end of the outflow pipe portion 121, and the filter housing connected below the outflow pipe portion 121. Part 123 and an inlet member attaching part 124 provided at the lower part of the filter housing part 123.

  As shown in FIG. 13, the outflow pipe portion 121 is a substantially circular tube-shaped portion extending vertically, and has an upper end opened and an outflow hole 121b having a diameter D121 inside. A mounting flange portion 122 is provided outward of the periphery of the opening of the outflow pipe portion 121. The mounting flange portion 122 has a substantially rectangular shape protruding left and right in plan view and rounded at the four corners. A groove 122c into which an O-ring (not shown) is fitted is provided around the opening of the outflow pipe portion 121 in the mounting flange portion 122. As shown in FIG. 11, a right through hole 122a is provided in the vertical direction at the approximate center of the portion protruding to the right side of the mounting flange 122, and the left through hole 122b in the vertical direction is provided at the approximate center of the portion protruding to the left. Is provided. A bush (not shown) can be inserted into the through holes 122a and 122b, and a bolt B can be inserted from below.

  As shown in FIGS. 12 to 14, the left wall portion 123 a of the filter housing portion 123 extends in the vertical direction with the center in the front-rear direction curved toward the right side, and the right wall portion 123 b has the center in the front-rear direction. It extends in the vertical direction with a curved shape toward the left side. Further, the front wall portion 123c of the filter housing portion 123 extends in the vertical direction with a center curved forward, and the rear wall portion 123d extends in the vertical direction with a center curved rearward. An upper wall portion 123e having a flat shape is provided so as to close the upper end of the portion surrounded by the wall portions 123a to 123d. A space in the filter housing portion 123 formed by being surrounded by the walls 123 a to 123 e communicates with the outflow hole 121 b in the outflow pipe portion 121.

  As shown in FIGS. 13 and 14, the left wall portion 123a of the filter housing portion 123 and the left mesh portion 111a of the filter 11 are opposed to each other, and similarly, the right wall portion 123b and the right mesh portion 111b are opposed to each other. The front wall portion 123c and the front mesh portion 111c are opposed to each other, and the rear wall portion 123d and the rear mesh portion 111d are opposed to each other. The filter accommodating portion 123 has a minimum distance d11 between the inner surface of the central portion of the left wall portion 123a and the left mesh portion 111a and the minimum distance between the inner surface of the central portion of the right wall portion 123b and the right mesh portion 111b. The distance d12 is equal to the distance d12. Further, the separation distance d13 between the inner surface of the center portion of the front wall portion 123c and the front mesh portion 111c is equal to the separation distance d14 between the inner surface of the center portion of the rear wall portion 123d and the rear mesh portion 111d. It is formed to become. The filter housing portion 123 is shaped such that the separation distances d13 and d14 are longer than the separation distances d11 and d12.

  At this time, the curved portion at the center in the front-rear direction in the left wall portion 123a and the right wall portion 123b is a tool avoidance wall portion for preventing interference with the tool T for fastening the bolt B. Further, the flow resistance when oil passes through the filter 11 and flows between the inner surface of the front wall portion 123c and the front mesh portion 111c and between the inner surface of the rear wall portion 123d and the rear mesh portion 111d is low. The front wall portion 123c and the rear wall portion 123d are formed so that the separation distances d13 and d14 are sufficiently long so as to be suppressed. At this time, in order to keep the flow resistance of the oil flowing in the main body 12 lower, in the relationship between the separation distances d13 and d14 and the diameter D121 in the outflow hole 121b, d13 and d14 are longer than half of D121. It is preferable that a front wall portion 123c and a rear wall portion 123d are formed on the front wall. Furthermore, the separation distance d15 between the upper wall portion 123e and the upper mesh portion 111e is longer than d13 and d14 so that an oil circulation route can be secured even if the upper mesh portion 111e is blocked with dust or the like. It is preferable to form the main body 12 so as to be.

  In the inflow member mounting portion 124, a portion where the outer peripheral shape is larger than the peripheral edge of the lower end portion of the filter housing portion 123 and a portion whose outer peripheral shape is larger than that portion are stepped downward. Is formed. As shown in FIG. 12, a stepped portion 124 a into which the inlet member 13 is fitted is provided on the inner periphery of the inlet member attaching portion 124, and this stepped portion 124 a holds the upper peripheral edge of the flange 112. The filter holding surface 124b to be welded is provided on the upper end side, the welding holding surface 124c to be welded to the inlet member 13 is provided on the lower side of the filter holding surface 124b, and the lower end surface 124d is provided on the lower end. .

  The inlet member 13 is an injection-molded product of a resin material, and is a member fitted to the lower side of the main body portion 12 having an inflow hole 136 for sucking oil. As shown in FIGS. 11 and 12, on the upper part of the inlet member 13, the filter holding protrusion 133 and the filter whose outer peripheral shape corresponds to the inner peripheral shape of the stepped portion 124 a in the inlet mounting portion 124. A supporting protrusion 132 is formed.

  On the outer periphery of the inlet member 13, a fitting portion 134 that fits into the step portion 124 a is formed over the entire circumference along the step portion 124 a. The fitting portion 134 is provided with a welding surface 134a facing the welding surface 124c and a fitting surface 134b facing the lower end surface 124d over the entire circumference.

  An inflow portion 135 is provided at a rear portion of the inlet member 13. At the lower end of the inflow portion 135, a circular suction port 135a opens downward. The lower portion of the inflow portion 135 protrudes further below the lower end surface 134c of the fitting portion 134. The outer shape of the inflow portion 135 is substantially circular, and gradually increases from the suction port 135a to the position of the lower end surface 134c.

  The inflow hole 136 of the inflow portion 135 communicates with the hollow portion of the filter housing portion 123. The shape of the inflow hole 136 is gradually reduced toward the lower side by the cross-sectional shape formed by the inner peripheral shape of the filter supporting protrusion 132. It is shaped so as to be connected to the circular cross-sectional shape of the mouth 135a.

  Next, the assembly of the strainer 9 will be described. First, after inserting the filter 11 from the lower side of the main body 12, the fitting portion 134 of the inlet member 13 is aligned with the stepped portion 124 a of the main body 12, thereby fitting the inlet member 13 to the main body 12. Let Thereafter, the main body portion 12 and the inlet member 13 are welded and integrated by an ultrasonic welding method. At this time, the filter 11 is fixed by sandwiching the outer peripheral edge of the flange 112 of the filter 11 between the filter holding surface 124 b and the filter holding protrusion 133.

  Next, attachment of the strainer 9 to the engine Ec will be described. As shown in FIG. 15, the strainer 9 is installed at a predetermined position of the engine Ec. The strainer 9 is attached by inserting the bolt B into the through holes 122a and 122b of the attachment flange portion 122 and screwing the bolt B into the screw hole on the engine Ec side with the tool T. At this time, the left wall portion 123a and the right wall portion 123b of the filter housing portion 123 are positioned on the protruding side of the mounting flange portion 122, and are curved so that the center in the front-rear direction does not interfere with the fastening member tool T. Therefore, the tool T does not come into contact with the main body 12 when the strainer 9 is attached to the engine Ec.

  Next, the flow of fluid in the strainer 9 will be described. The oil that has been sucked up by the operation of the pump passes through the mesh portions 111a to 111e from the inside to the outside of the three-dimensional shape portion 111 of the filter 11, and is filtered. The oil that has passed through the three-dimensionally shaped portion 111 of the filter 11 flows upward through the filter housing portion 123 and passes through the outflow hole 121b in the outflow pipe portion 121. At this time, as shown in FIG. 13, the filter accommodating portion 123 includes a separation distance d13 between the inner surface of the front wall portion 123c and the front mesh portion 111c of the filter 11, the inner surface of the rear wall portion 123d, and the rear side of the filter 11. Since the front wall portion 123c and the rear wall portion 123d are formed so that the separation distance d14 between the mesh portions 111d is sufficiently long, the flow resistance when oil flows from the inside to the outside of the filter 11 can be kept low. It is like that.

  As described above, according to the strainer 9 according to the second embodiment, as in the strainer 1 according to the first embodiment, the filter 11 of the three-dimensionally shaped portion 111 having a wide effective filtration area is accommodated in the case 14, thereby extending the life. As a result, the flow resistance can be kept low, the size can be reduced, and the mounting workability can be improved.

  In the second embodiment, the suction port 134a is disposed on the rear end side of the inlet member 13. However, the suction port 134a may be disposed at the front or the center, or may have a shape in which the central axis of the suction port 134a is inclined. May be.

  Moreover, although the strainer 9 has the main body 12 and the inlet member 13 in a divided structure, it may be an integrally molded product.

  Further, the strainer of the first and second embodiments may be provided in a power machine such as an automatic transmission.

  Moreover, the strainer of Embodiments 1 and 2 can be applied to the case of sending water or the like other than oil.

  In the first and second embodiments, the filters 2 to 11 are injection-molded products made of a resin material.

  As described above, the strainer according to the present invention is suitable for an automobile engine, for example.

3 is a perspective view of a strainer according to Embodiment 1. FIG. It is a disassembled perspective view of a strainer. It is AA sectional drawing in FIG. It is BB sectional drawing in FIG. It is a figure at the time of assembling a strainer to an engine. FIG. 6 is a view corresponding to FIG. 1 according to a first modification of the first embodiment. FIG. 6 is a view corresponding to FIG. 1 according to a second modification of the first embodiment. It is CC sectional drawing in FIG. FIG. 6 is a view corresponding to FIG. 1 according to a third modification of the first embodiment. It is DD sectional drawing in FIG. FIG. 3 is a view corresponding to FIG. 1 in Embodiment 2. FIG. 3 is a diagram corresponding to FIG. 2 in Embodiment 2. It is EE sectional drawing in FIG. It is FF sectional drawing in FIG. It is a figure at the time of assembling the strainer which concerns on Embodiment 2 to an engine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Strainer 2 Filter 21 Three-dimensional shape part 21a Left mesh part 21b Right mesh part 21c Front mesh part 21d Rear mesh part 21e Upper mesh part 3 Main body part 31 Outflow pipe part (outflow hole formation part)
31a Connection part 31b Outflow hole 32 Mounting flange part (fastening part)
33 Filter housing part 33a Left wall part (tool avoidance wall part)
33b Right wall (tool avoidance wall)
33c Front wall part (channel expansion wall part)
33d Rear wall part (channel expansion wall part)
4 Inlet member (inlet hole forming part)
46 Inflow hole 10 Case B Bolt T Tool Ec Engine

Claims (1)

A filter having a mesh part for filtering liquid;
A fluid that has an inflow hole forming portion that forms an inflow hole into which liquid flows in, and an outflow hole forming portion that forms an outflow hole through which liquid flows out, and that accommodates the filter, and flows in from the inflow hole A strainer configured to pass through the mesh portion and flow out from the outflow hole,
In the outflow hole forming part, a fastening part fastened by a fastening member is formed so as to protrude in the radial direction of the outflow hole,
On the outflow hole forming part side of the case, a filter housing part surrounding the mesh part of the filter is formed,
The mesh portion of the filter is formed to form a three-dimensional shape that swells in the fluid flow direction, and is disposed in the filter housing portion.
In the filter housing portion, a tool avoiding wall portion for avoiding interference with the fastening member tool and a flow passage expanding wall portion for expanding the flow passage in the case surround the mesh portion in the circumferential direction. Next to each other,
The separation distance between the inner surface of the flow path expanding wall portion and the mesh portion facing the inner surface is set longer than the separation distance between the inner surface of the tool avoidance wall portion and the mesh portion facing the inner surface. A strainer characterized by that.

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