JP2010188272A - Suction filter, and method of producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a suction filter excellent in productivity. <P>SOLUTION: A coil spring 17 is disposed in a bag 11 of the suction filter 10. One end part 17a of the coil spring 17 is formed by insert-molding and is buried and fixed in a pedestal member 16. The other end part 17b of the coil spring 17 is held by a pedestal member 13. The coil spring 17 stretches the bag 11. By virtue of the structure, the coil spring 17 is prevented from falling off. Since the coil spring 17 does not fall off even in a bag production process of producing the bag 11, a half-finished bag can easily be handled and thereby the productivity can be enhanced. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bag-like suction filter attached to a liquid suction port and a method for manufacturing the same.

  Conventionally, suction filters described in Patent Document 1 and Patent Document 2 are known. These suction filters have a bag that can be expanded and contracted in the vertical direction. A coil spring as a spring member is disposed in the bag body, and the bag body is extended in the expansion / contraction direction. As a result, the suction filter is pressed against the bottom surface of the tank, so that liquid can be sucked from the bottom surface of the tank even if there is an error in the mounting position, deformation of the tank bottom surface, or deformation due to vibration.

JP 2003-172220 A Japanese Examined Patent Publication No. 7-73643

  In the technique described in Patent Document 1, the spring member and the bag body are fixed by engaging a metal spring member with a resin base provided on the bag body. However, since a step of attaching the spring member is required in the assembly process, there are problems such as an increase in assembly man-hours, occurrence of incomplete attachment, or an increase in inspection man-hours in the attachment state. Furthermore, since it is necessary to proceed with the operation of sealing the bag body while maintaining the state where the spring member of another component is mounted, there is a problem that the sealing operation becomes difficult.

  Further, in the technique described in Patent Document 2, a resin component in which a spring member and a pedestal are integrally formed has been proposed. However, in this configuration, the spring member is integrally formed with the pedestal including the outlet pipe. In addition, the outlet pipe and the spring member protrude from both sides of the pedestal. For this reason, there exists a problem that the structure of a resin component becomes complicated and it becomes difficult to shape | mold a resin component. In addition, it is necessary to give the base sufficient strength to support both the outlet pipe and the spring member.

  An object of this invention is to provide the suction filter excellent in productivity, and its manufacturing method in view of the said problem.

  In order to achieve the above object, the following technical means can be employed. The invention according to claim 1 is a bag body (11) formed into a bag shape that can be expanded and contracted in a predetermined direction by a filter medium, and an outlet as a liquid outlet, positioned in one of the expansion and contraction directions of the bag body (11). A first pedestal member (13) provided with a pipe (14), a second pedestal member (16) positioned on the other side of the bag body (11) in the expansion and contraction direction, a first pedestal member and a second Spring members (17, 217) that are disposed between the base member and extend the bag body, one end of which is insert-molded or integrally formed with the second base member (16). And a spring member (17, 217) that is integrally fixed to the second pedestal member (16) and has the other end held by the first pedestal member (13). A technical means called a suction filter is adopted. According to this invention, the movement and dropout of the spring member can be avoided. In the step of forming the bag body, the spring member is fixed to the second pedestal member, so that the semi-finished product can be easily handled and the productivity can be improved.

  The invention according to claim 2 is a technical means in which the spring member (17) is a metal spring and one end (17a) thereof is insert-molded in the second pedestal member (16). adopt. According to this invention, even if it is a case where a metal spring is used, a spring member can be prevented from moving and dropping, and productivity can be improved.

  According to a third aspect of the present invention, the spring member (17) is a resin spring, and one end portion (17a) thereof is insert-molded into the second pedestal member (16) or integrally molded. Adopt technical means. According to this invention, even when a resin spring is used, the movement and dropout of the spring member can be avoided, and the productivity can be improved.

  The invention according to claim 4 employs technical means that the spring member (17) has a rectangular cross section extending along the second pedestal member (16). According to this invention, the amount of coil spring collapse can be suppressed, and the movement and dropout of the spring member can be avoided.

  The invention according to claim 5 is a resin component molding in which a filter medium (11a) is prepared and a first pedestal member (13) and a second pedestal member (16) are molded from a resin material on the filter medium. A bag that forms a bag-like bag body (11) that can be expanded and contracted by a filter medium in a predetermined direction while disposing a spring member (17, 217) between the step and the first pedestal member and the second pedestal member In the manufacturing method of the suction filter including the body processing step, in the resin component molding step, the outlet pipe (14) as the liquid outlet is integrally formed on the first pedestal member, and the spring member is attached to the second pedestal member. The one end (17a) of the base plate is insert-molded, or the second pedestal member and the spring member are integrally molded, so that the spring member and the second pedestal member are integrally fixed, and the bag body is processed. In the process, the other end of the spring member ( 7b) is positioned on the holding portion (15) of the first pedestal member, and the technical means of forming the bag body by positioning the first pedestal member and the second pedestal member at both ends in the expansion / contraction direction is adopted. . According to the present invention, the spring member can be integrally fixed to the second pedestal member in the resin component molding process, the handling of the semi-finished product in the subsequent bag body processing process becomes easy, and the productivity is improved. Can do. Further, the suction filter manufactured by this manufacturing method can avoid the movement and dropout of the spring member.

  According to a sixth aspect of the present invention, in the resin component molding step, the outlet pipe is integrally formed with the first base member so as to extend from the outer side surface of the filter medium, and the spring member extends from the inner side surface of the filter medium. The second pedestal member is integrated and fixed, and in the bag body processing step, a technical means of forming the bag body by bending the filter medium is adopted. According to the present invention, it is possible to provide an arrangement of an outlet pipe and a spring member suitable for a manufacturing method in which a filter medium is bent to form a bag body. Moreover, the spring member can be fixed integrally without excessively complicating the configuration of the first pedestal member and its mold.

  In addition, the code | symbol in the parenthesis as described in a claim and said each means shows the correspondence with the specific means as described in embodiment mentioned later as one aspect.

It is sectional drawing which shows the suction filter of 1st Embodiment of this invention. It is sectional drawing which shows the suction filter of 1st Embodiment. It is sectional drawing which shows the manufacturing process of the suction filter of 1st Embodiment. It is a perspective view which shows the spring member of 2nd Embodiment of this invention. It is sectional drawing which shows the spring member of 2nd Embodiment.

(First embodiment)
Hereinafter, a first embodiment in which the present invention is applied to a suction filter of a vehicle fuel supply device will be described. FIG. 1 is a cross-sectional view showing a suction filter 10 according to a first embodiment of the present invention, in which the suction filter 10 extends in the expansion / contraction direction and is housed in a fuel tank. FIG. 2 is a cross-sectional view showing the suction filter 10 and shows a state in which the suction filter 10 is reduced in the expansion / contraction direction. FIG. 3 is a cross-sectional view showing the shape of the suction filter 10 in the manufacturing process.

  1 and 2, the suction filter 10 includes a bag body 11 and a resin component 12 provided on the bag body 11. The bag body 11 is formed by forming a mesh-shaped filter medium 11a formed by weaving resin yarns into a bag shape. The bag body 11 is formed by laminating the upper surface 11c and the lower surface 11d of the filter medium 11a in two layers and sealing the outer peripheral edge thereof. On the outer peripheral edge of the bag body 11, a welded portion 11b is formed by welding the upper surface 11c and the lower surface 11d. The bag body 11 is configured to provide an upper surface 11c and a lower surface 11d by folding a substantially rectangular filter medium 11a in half. The filter medium 11a is bent in half so that one side is a bent portion, and the remaining three sides are provided with a welded portion 11b as a sealing portion. The bag body 11 is configured to be extendable along the stacking direction with the stacking direction of the upper surface 11c and the lower surface 11d as a predetermined direction.

  The resin component 12 includes a base member 13 as a first base member fixed to the upper surface 11c and a base member 16 as a second base member fixed to the lower surface 11d. A pedestal member 13 is provided at the edge of the opening that passes through substantially the center of the upper surface 11c. The pedestal member 13 is formed in an annular plate shape, and the central opening is a fuel passage. The base member 13 is insert-molded with the filter medium 11a by inserting a resin material into the mesh of the filter medium 11a. The pedestal member 13 provides a fluid passage therein, and has an outlet pipe 14 as a liquid outlet, and a spring holding portion 15 that receives and positions the free end of the spring member. An outlet 14 a is opened at one end of the outlet pipe 14 extending from the base member 13, and the other end is opened in the bag body 11. The holding | maintenance part 15 can receive a spring member in a cyclic | annular protrusion, and forms the level | step-difference part by which the edge part of a spring member is stably arrange | positioned. The holding part 15 is provided coaxially with the outlet pipe 14.

  A pedestal member 16 is provided so as to close an opening penetrating substantially the center of the lower surface 11d. The pedestal member 16 is formed in a circular plate shape. The base member 16 is insert-molded with the filter medium 11a by inserting a resin material into the mesh of the filter medium 11a. The base member 13 is positioned on one side of the bag body 11 in the expansion / contraction direction, and the base member 16 is positioned on the other side of the bag body 11 in the expansion / contraction direction. Therefore, they are provided at opposing positions in the expansion / contraction direction of the bag body 11. The pair of pedestal members 13 and 16 are provided on the filter medium 11a in the expansion and contraction direction of the bag body 11 as members that receive the urging force of the spring member.

  A metal coil spring 17 is disposed between the base member 13 and the base member 16 in a compressed state. The coil spring 17 is a spring member that pushes the bag body 11 in the extending direction. One end 17 a of the coil spring 17 is integrally fixed to the pedestal member 16. The end portion 17 a is embedded in the pedestal member 16. The coil spring 17 is insert-molded on the base member 16 by positioning the end portion 17a in the mold and injecting a resin material into the mold and curing the resin material. The wire rod of the end portion 17a is embedded in the base member 16 over a sufficient length in order to obtain a sufficient fixing strength. The wire rod of the end portion 17a can be embedded in the pedestal member 16 over a length of approximately 1/2 to 1 turn. The end 17a can be disposed over both sides of the filter medium 11a through an opening provided in the filter medium 11a.

  The other end 17 b of the coil spring 17 is a free end of the coil spring 17. The end portion 17b is terminated in a ring shape. The end portion 17 b is positioned in the holding portion 15 and is held with respect to the radial direction of the coil spring 17. The end portion 17 b can be press-fitted into the holding portion 15. In this case, the end portion 17 b is also held in the holding portion 15 in the axial direction of the coil spring 17.

  The suction filter 10 can be disposed so that the base member 16 or the lower surface 11d is in contact with the bottom surface of the vehicle-mounted fuel tank 1. Since the bag body 11 is configured to be able to expand and contract in the vertical direction, the contact state between the suction filter 10 and the bottom surface of the fuel tank is maintained even if there is an error in the attachment position of the suction filter 10, deformation of the fuel tank, or vibration. The The suction filter 10 is connected to an intake port of a pump 3 that supplies fuel to the internal combustion engine 2 that is a fuel consuming device.

  In FIG. 3, the cross section of the semi-finished product before being formed as the bag 11 is shown. The manufacturing method of the suction filter 10 includes a preparation process, a resin component molding process, and a bag body processing process. First, in the preparation step, a filter medium 11a that is rectangular and can be developed in a planar shape is prepared. The filter medium 11 a is provided with openings corresponding to the base members 13 and 16.

  In the resin component molding step, first, the filter medium 11a is placed in a molding die. A coil spring 17 is arranged in the mold together with the filter medium 11a. The coil spring 17 is arranged with its end 17a positioned in a cavity in a mold in which the base member 16 is to be molded. After the filter medium 11a and the coil spring 17 are disposed in the mold, the mold is closed and the resin component 12 is insert-molded by an injection molding technique. Thereby, the base member 13 and the base member 16 are shape | molded by the resin material on the filter medium 11a. At this time, the base members 13 and 16 are formed separately from each other on the filter medium 11a. The outlet pipe 14 is formed so as to protrude and extend from the outer surface of the filter medium 11a as the bag body 11. On the other hand, the coil spring 17 is positioned and fixed to the pedestal member 16 so as to protrude and extend from the inner surface of the filter medium 11 a as the bag body 11. In this manner, the outlet pipe 14 and the coil spring 17 are arranged in a distributed manner on the base members 13 and 16, and are formed so as to protrude toward the opposite side of the filter medium 11a. When the resin material is cured, the mold is opened and the molded semi-finished product is taken out.

  Next, in the bag body processing step, the filter medium 11a is bent in half. As a result, the half of the filter medium 11a is laminated as the upper surface 11c, and the remaining half is laminated as the lower surface 11d. When the filter medium 11 a is bent, the end 17 b of the coil spring 17 is positioned in the holding portion 15. The filter medium 11a is arranged to position the pedestal member 13 and the pedestal member 16 at both ends in the expansion / contraction direction while the end portion 17b of the coil spring 17 is positioned on the holding portion 15 of the pedestal member 13, thereby forming the bag body 11. In a state where the coil spring 17 is compressed in the axial direction, weld portions 11b are formed on three sides of the outer peripheral edge of the filter medium 11a, and the bag body 11 is sealed. As a result, the bag 11 is formed.

  In the suction filter 10 of this embodiment, a coil spring 17 as a spring member is firmly fixed to a base member. For this reason, in the product state, it is possible to avoid undesirable movement and dropout of the coil spring 17 in the bag 11. Moreover, in the manufacturing method, handling of semi-finished products becomes easy, and productivity can be improved. More specifically, since the coil spring 17 is firmly fixed to the pedestal member 16 in the bag body processing step in which the filter media 11a are stacked and sealed to form the bag body 11, the operation of the bag body processing step is performed. Easy to proceed.

  An outlet pipe 14 is formed on one pedestal member 13, and a coil spring 17 is fixed to the other pedestal member 16. For this reason, components can be distributed and arranged on the base members 13 and 16. For example, it is possible to avoid the pedestal member 13 as the root portion of the outlet pipe 14 from being excessively large and complicated. Further, it is possible to avoid complication of only a part of the mold.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 4 is a perspective view showing a coil spring 217 used in the suction filter of the second embodiment. FIG. 5 is a cross-sectional view of the coil spring 217 and shows a VV cross section of FIG. The coil spring 217 of this embodiment is fixed on the base member 16 in place of the coil spring 17 of the preceding embodiment, and is disposed in the bag body 11. Components that can be referred to in the preceding description are denoted by the same reference numerals as in the previous embodiment.

  The coil spring 217 is the same as the base member 16 and is formed of a continuous resin material. The coil spring 217 is integrally formed with the base member 16. The coil spring 217 has a shape in which thin plate members are arranged in a spiral shape. One end 217 a of the coil spring 217 is connected to the base member 16 and fixed. The other end 217b of the coil spring 217 is a free end, and is terminated by arranging a plate material in an annular shape. Although the coil spring 17 of the preceding embodiment uses a wire having a circular cross section, the coil spring 217 has a rectangular plate-like cross section extending along the base member 16.

  The manufacturing method of the suction filter 10 of this embodiment also includes a preparation process, a resin component molding process, and a bag body processing process, as in the preceding embodiment. In the resin component molding step, the base member 16 and the coil spring 217 are integrally molded, and they are simultaneously insert-molded on the filter medium 11a. The preparation step and the bag processing step are the same as in the preceding embodiment.

  According to this embodiment, since the coil spring 217 can be integrally formed with the pedestal portion 16, the number of parts can be reduced and the productivity can be increased. Further, the coil spring 217 is not easily deformed in the direction in which the axis AX falls. For this reason, it is difficult for the end portion 217 b to escape from the holding portion 15.

(Other embodiments)
The technical scope of the present invention is not limited to the embodiment described above. The above-described embodiments can be accompanied by various modifications, improvements, or extensions within the technical scope of the present invention. The present invention includes embodiments including at least the following modifications, improvements, and extensions.

  For example, in the above-described embodiment, the bag body 11 is formed by bending one rectangular filter medium 11a in half, but the bag body 11 may be formed by stacking two filter media 11a. Even in such a configuration, the outlet pipe 14 can be disposed on the upper surface 11c, and the coil springs 17 and 217 can be disposed on the lower surface 11d. Moreover, the filter medium 11a can be made into the shape according to uses, such as circular and trapezoid.

  Further, instead of the coil springs 17 and 217, a pantograph-shaped leaf spring or the like may be used. For example, instead of the coil spring 217, a leaf spring that is relatively easy to mold may be integrally formed on the pedestal member 16, and its end may be brought into contact with and held by the pedestal member 13. Alternatively, the resin coil spring 217 may be molded independently, and then insert molded into the base member 16. Further, the outlet pipe 14 may be shortened to the same height as the base member 13.

DESCRIPTION OF SYMBOLS 1 Fuel tank 2 Internal combustion engine 3 Pump 10 Suction filter 11 Bag 11a Filter material 11b Welding part 11c Upper surface 11d Lower surface 12 Resin parts 13, 16 Base member 14 Outlet pipe 14a Outlet 15 Holding part 17a, 17b, 217a, 217b End

Claims (6)

A bag body (11) formed into a bag shape that can be expanded and contracted in a predetermined direction by a filter medium;
A first pedestal member (13) positioned on one side of the bag body (11) in the expansion and contraction direction and provided with an outlet pipe (14) as an outlet for liquid;
A second pedestal member (16) positioned on the other side of the bag body (11) in the expansion and contraction direction;
A spring member (17, 217) disposed between the first pedestal member and the second pedestal member and extending the bag body, one end of which is the second pedestal member (16 ), Or integrally molded to the second pedestal member (16) and the other end is held by the first pedestal member (13). A suction filter comprising: a spring member (17, 217).   Suction according to claim 1, characterized in that the spring member (17) is a metal spring, one end (17a) of which is insert-molded into the second pedestal member (16). filter.   The spring member (217) is a resin spring, and one end (217a) of the spring member (217) is insert-molded or integrally molded with the second pedestal member (16). The suction filter according to claim 1.   Suction filter according to claim 3, characterized in that the spring member (217) has a rectangular cross section extending along the second pedestal member (16). Preparing a filter medium (11a);
On the filter medium, a resin component molding step of molding the first pedestal member (13) and the second pedestal member (16) with a resin material,
A bag that forms a bag-like bag body (11) that can be expanded and contracted in a predetermined direction by the filter medium while arranging spring members (17, 217) between the first pedestal member and the second pedestal member. In a manufacturing method of a suction filter comprising a body processing step,
In the resin component molding process,
While integrally forming an outlet pipe (14) as an outlet for liquid on the first pedestal member,
One end (17a, 217a) of the spring member is insert-molded in the second pedestal member, or the second pedestal member and the spring member are integrally molded, whereby the spring member and the The second pedestal member is integrated and fixed,
In the bag processing step,
While positioning the other end portion (17b, 217b) of the spring member at the holding portion (15) of the first pedestal member, the first pedestal member and the second pedestal member are arranged at both ends in the expansion / contraction direction. A method for manufacturing a suction filter, wherein the bag body is formed by positioning. In the resin component molding process,
While integrally forming the first pedestal member so that the outlet pipe extends from the outer surface of the filter medium,
The spring member is integrated and fixed to the second pedestal member so as to extend from the inner surface of the filter medium,
In the bag processing step,
The method for manufacturing a suction filter according to claim 5, wherein the bag is formed by bending the filter medium.

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