JP2009062912A - Fuel filter device and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maximally reduce the size of a filter device constituted by integrally welding a connector and an interval forming member mutually combined via a through-hole formed in a filter body. <P>SOLUTION: This fuel filter device has the synthetic resin interval forming member 2 for keeping the filter body 1 in a swelled state, and the synthetic resin connector 3 for communicating and connecting an inside space 15 of the filter body 1 with and to a fuel suction port Pa. The interval forming member 2 and the connector 3 are respectively provided with a joining part mutually joined via the through-hole 11 formed in the filter body 1, and the inside of the joining part is formed as a fuel flow passage (x). The interval forming member 2 has an interval forming projection 20e under its joining part. The interval forming member 2 and the connector 3 can be welded on a substantially just above position of the interval forming projection 20e, and the position becomes a weld part 4 of the both. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a filter device that is attached to a fuel suction port in a fuel tank of an automobile, a two-wheeled vehicle, etc., and prevents water or foreign matter from entering the fuel transferred to the internal combustion engine through the fuel suction port. .

  In order to prevent water and foreign matter from entering the fuel transferred from the fuel tank to the internal combustion engine by the fuel pump, there is a filter device that is attached to the fuel suction port Pa and used.

  Such a filter device includes a filter body 100 made of a filter medium 101 and forming a bag shape, a synthetic resin-made interval forming member 200 that is in the filter body 100 and keeps the filter body 100 in an expanded state, and the filter body 100. A connector 300 made of a synthetic resin for connecting the internal space 103 to the fuel suction port Pa is provided. (FIG. 5, FIG. 7) On the lower surface of the gap forming member 200, a gap forming projection 202 is formed to prevent the filter medium 101 from sticking to the through hole 201 that becomes the fuel flow path x formed in the gap forming member 200. Has been. Conventionally, the connector 300 and the interval forming member 200 are configured to abut the flange 301 of the connector 300 and the formation location of the through hole 201 of the interval forming member 200 through the through hole 102 of the filter medium 101 and the interval forming protrusion. The contact surface 203 of the horn H ′ for ultrasonic welding is formed between the through hole 201 of the 202 gap forming member 200 and is welded and integrated at the abutting portion 400 immediately above the contact surface 20. It was. (FIG. 6) For this reason, in the conventional filter device, the distance forming member 200 needs to have dimensions for the through hole 201, the contact surface 203, and the space forming protrusion 202 at the welding position. It was a hindrance.

  The main problem to be solved by the present invention is that this type of fuel filter device is constructed by welding and integrating a connector and a gap forming member that are joined together through a through hole formed in the filter body, This is to make it possible to reduce the size of the gap forming member at the joining portion as much as possible.

In order to achieve the above object, in the present invention, the fuel filter device has the following configurations (1) to (3).
(1) A filter body made of a filter medium and forming a bag shape, a synthetic resin gap forming member that keeps the filter body in an inflated state in the filter body, and an internal space of the filter body connected to the fuel suction port And a synthetic resin connector
(2) Each of the gap forming member and the connector is provided with a joint portion that is joined to each other through a through hole formed in the filter body, and the inside of the joint portion serves as a fuel flow path. ,
(3) The interval forming member includes an interval forming projection below the joint portion, and the interval forming member and the connector can be welded from a position almost directly above the interval forming projection to the fuel flow path. In this way, the welded portion between them is located.

  The gap forming member is provided with a gap forming protrusion below the joint, and the gap forming member and the connector can be welded from a position almost directly above the gap forming protrusion to the fuel flow path. Since the welded part of both of them is located in the meantime, a gap forming projection for preventing the filter medium from sticking to the fuel flow path in the gap forming member is not formed between this flow path and , The gap can be formed as small as possible. As a result, the size of the gap forming member can be reduced as much as possible, and the filter device can be rationally made compact.

  The gap forming member and the connector are combined by fitting a protrusion provided on one of them into a recess provided on the other, and the welding portion is positioned at the fitting position. If this is done, it is possible to firmly weld and integrate the two at this fitting location.

  If the contact surface of the jig for ultrasonic welding, high frequency welding, vibration welding, laser welding or spin welding is formed at the tip of the spacing forming projection, this spacing forming projection is used to It is possible to weld the gap forming member and the connector between the position immediately above the gap forming protrusion and the fuel flow path.

  A plurality of gap forming protrusions are formed at the hole edge of the through hole of the gap forming member serving as the fuel flow path so as to be spaced from adjacent gap forming protrusions in the direction around the through hole. By doing so, the fuel that has been filtered and sucked into the filter body can be sent into the fuel suction port through the through hole from between the adjacent spacing forming projections.

Moreover, in this invention, the manufacturing method of each said filter apparatus for fuels shall be based on the process of the following (1)-(3).
(1) After joining the joints of the interval forming member and the connector to each other through the through holes formed in the filter medium constituting the filter body,
(2) A tool for ultrasonic welding, high-frequency welding, vibration welding, laser welding or spin welding is brought into contact with a contact surface formed at the tip of the spacing forming projection, and this spacing forming member and connector Weld
(3) Thereafter, the filter medium is formed into a bag shape, and a gap forming member is provided inside the filter body with a connector on the outside thereof.

  According to the present invention, the size of the space forming member at the joint portion between the connector and the space forming member to be joined to each other through the through hole formed in the filter body can be maintained while keeping the through hole at a predetermined size. Can be made as small as possible, and therefore the filter device can be made reasonably compact.

  The best mode for carrying out the present invention will be described below with reference to FIGS.

  Here, FIG. 1 shows the use state of the filter device according to the embodiment, and FIGS. 2 and 3 show the filter device in a perspective state. FIG. This is shown from the bottom. FIG. 4 shows a contact state of the welding jig H to the interval forming member 2 when the interval forming member 2 and the connector 3 are welded via the interval forming protrusion 20e of the interval forming member 2. .

  The fuel filter device according to this embodiment is attached to a fuel suction port Pa in a fuel tank of an automobile or a two-wheeled vehicle, and water or foreign matter is transferred to the fuel transferred to the internal combustion engine through the fuel suction port Pa. Is to prevent the entry.

  Typically, such a filter device is used by being attached to the fuel suction port Pa of the suction pipe P in which the fuel suction port Pa is located in the fuel tank T. Such a filter device is typically provided such that the lower portion of the filter body 1 is in contact with the bottom wall Ta of the casing of the fuel tank or the fuel pump module.

  The fuel is transferred to the internal combustion engine through the fuel suction port Pa by a fuel pump disposed in the fuel tank or a fuel pump disposed outside the fuel tank.

  Such a filter device includes a filter body 1, a gap forming member 2, and a connector 3.

  The filter body 1 is made of a filter medium 10 and has a bag shape. As the filter medium 10, a synthetic resin mesh, woven fabric, knitted fabric, or nonwoven fabric sheet is used. Typically, in a state where one or more of these sheet-like filter media 10 are overlapped, one end of the band and the other band so as to fold them in two and form an enclosed space between the folded sides. A bag-like filter body 1 is formed from the filter medium 10 by performing belt-like welding that connects the ends to the folded sides. (FIGS. 1 to 3 / welded portion is indicated by reference numeral 14) Alternatively, 10 sets of the first filter medium 10 and the second filter medium 10 each configured by stacking two or more kinds of sheet-shaped filter media 10 or more. A bag-like filter body having an inner space inside the welded portion formed by applying a circumferential belt-like weld to the set after facing the sides to be positioned inside the filter body 1 1 is formed. The welded filter medium 10 is cut and trimmed within the width of the welded portion. The gap forming member 2 is disposed between the portion where the welding is performed and the folding side or the inside of the portion where the circumferential belt-like welding is performed before the welding is performed, and is accommodated in the filter body 1 by the welding. Typically, a mesh or woven filter medium 10 having an oil / water separation function is arranged on the outside of the filter body 1, and one or more dust removing filter mediums 10 made of a nonwoven fabric are arranged on the inside thereof.

  The space | interval formation member 2 consists of synthetic resins, and keeps the filter body 1 in the state which swelled in the said filter body 1. FIG.

  In the illustrated example, the interval forming member 2 includes a base portion 20 having a disk shape, and an extension portion 21 extending laterally with one end integrally connected to the base portion 20. A circular through hole 20a is formed at the center of the base portion 20, and a short cylindrical portion having an inner diameter equal to the through hole 20a on the upper surface of the base portion 20 and communicating the in-cylinder space with the through hole 20a. 20c is formed. A circumferential groove 20d is formed in the base portion 20 of the short cylindrical portion 20c, and a groove bottom of the circumferential groove 20d becomes a welded portion 4 described later. On the lower surface of the base portion 20, an interval forming projection 20e is formed. In the example shown in the figure, the gap forming protrusion 20e is an annular protrusion protruding from the lower surface of the base 20 so as to go around the through hole 20a with a slight gap between the protrusion 20e and the hole edge 20b of the through hole 20a of the base 20. Each part is configured to be divided into four interval forming protrusions 20e having substantially the same length. That is, in the illustrated example, a gap is formed between the hole edge 20b portion of the through hole 20a of the gap forming member 2 to be the fuel flow path x and the gap forming protrusion 20e adjacent in the direction around the through hole 20a. In this way, a plurality of gap forming protrusions 20e are formed. Thus, the fuel filtered and sucked into the filter body 1 is sent to the fuel suction port Pa through the through hole 20a from between the adjacent spacing forming projections 20e. The circumferential groove 20d is positioned immediately above the gap forming protrusion 20e. The extension portion 21 is provided with a plurality of substantially rectangular through holes 21b, 21b,... In an elongated plate body 21a formed so as to gradually become narrower as the distance from one end connected to the base portion 20 increases. Spacing forming projections 21c protruding from the lower surface of the extension portion 21 are provided on the left and right of the intermediate portion and on the left and right between the intermediate portion and the base portion 20, respectively. The interval forming projection 20e of the base portion 20 and the interval forming projection 21c of the extension portion 21 are configured to have substantially the same protruding dimension.

  The connector 3 is made of a synthetic resin and connects the internal space 15 of the filter body 1 to the fuel suction port Pa.

  In the illustrated example, the connector 3 includes a cylindrical main part 30 having both ends of the cylinder open, a connection ear 31 formed at the upper end of the cylindrical main part 30, and the cylindrical main part 30. And an outer flange 32 formed at the lower end. The connection ear portion 31 is provided so as to protrude outward of the cylindrical main portion 30, and includes a fixing hole 31a. The connector 3 and the suction port Pa are connected by inserting the suction port Pa into the cylindrical main part 30 from the upper end of the cylindrical main part 30. The outer flange portion 32 is configured to have a circular outer edge, and the lower surface of the outer flange portion 32 has a rounded rising portion shape in which the outer diameter and inner diameter of the short cylindrical portion 20c of the interval forming member 2 are substantially equal. A short cylindrical portion 32a is formed. The short cylinder portion 32a is configured to rotate around the base portion 20 of the gap forming member 2 when the gap forming member 2 and the connector 3 are joined so that the short cylinder portion 20c of the gap forming member 2 enters the inside thereof. The protruding end 32b is formed in the groove 20d.

And in this embodiment, through the through hole 11 formed in the filter medium 10 constituting the filter body 1, the short cylindrical portion 20 c as the joining portion of the interval forming member 2 is used as the joining portion of the connector 3. After the fitting interval forming member 2 and the connector 3 are joined and combined with each other inside the short cylindrical portion 32a,
A jig 20 for ultrasonic welding, high frequency welding, vibration welding, laser welding or spin welding (for example, a horn or anvil for ultrasonic welding, an electrode for high frequency welding) or a base 20 of the gap forming member 2. The gap forming member 20 and the connector 3 are welded at a position directly above the gap forming protrusion 20e by bringing the tip of the gap forming protrusion 20e into contact with the contact surface 20f.
Thereafter, the filter medium 10 is formed into a bag shape so that the gap forming member 2 is provided inside the filter body 1 and the connector 3 is provided outside thereof.

  The gap forming member 2 and the connector 3 are joined and combined by fitting a short cylindrical portion 32 a as a protrusion 33 provided in the connector 3 into a circumferential groove 20 d as a recess 22 provided in the gap forming member 2. In addition, since the welded portion 4 is positioned at this fitting location, both are firmly welded and integrated at this fitting location.

  In the example shown in the drawing, the tip of the gap forming member 2 is a flat contact surface 20f for these jigs H that are in close contact with the jig H, and the gap forming projections 20e are The cross section in the direction perpendicular to the protruding direction is configured to have substantially the same area as the contact surface 20f at any position, so that the position directly above the spacing forming protrusion 20e through the spacing forming protrusion 20e. Is formed by ultrasonic welding or high-frequency welding between the gap forming member 2 as the welding portion 4 and the connector 3. (Fig. 4)

  The through hole 11 of the filter medium 10 constituting the filter body 1 is substantially equal to or slightly larger than the outer diameter of the short cylindrical portion 20c of the outer flange 32 of the connector 3, and the hole edge 12 of the through hole 11 of the filter medium 10 is The joint portion is combined and sandwiched between the base portion 20 of the gap forming member 2 welded at the weld portion 4 and the outer flange portion 32 of the connector 3. (FIG. 1) In the figure, the projection indicated by reference numeral 34 and the corresponding recess 23 pass through the filter medium 10 so as to bend and crush the filter medium 10 sandwiched between the projection 34 and the recess 23. This is to increase the holding force of the hole edge 12 of the hole 11.

  In the filter device according to this embodiment, the gap forming member 2 is provided with a gap forming protrusion 20e below the joint portion, and the gap forming member 2 and the connector 3 are connected to the gap forming protrusion. Since it can be welded at a position almost directly above 20e, and this position is the welded portion 4, the filter medium 10 is attached to the fuel flow path x (the through hole of the base portion 20) in the gap forming member 2. It is possible to form the gap-forming projections 20e to prevent the gap from being formed between the flow paths or with the gap as small as possible. Thereby, the size of the space forming member 2 can be made as small as possible, and thus the filter device can be rationally made compact.

Cross-sectional configuration diagram showing the filter device in use Same perspective configuration diagram Same perspective configuration diagram Configuration diagram showing the welding method Cross-sectional configuration diagram of a conventional filter device Configuration diagram showing a conventional filter device welding method Perspective configuration diagram of the interval forming member 2 constituting the conventional filter device

Explanation of symbols

1 Filter body 11 Through hole 15 Internal space
2 Spacing member 20e Protrusion for spacing
3 Connector 4 Welded part Pa Fuel inlet x Flow path

Claims (5)

A filter body made of a filter medium and forming a bag shape, a synthetic resin interval forming member that keeps the filter body in an inflated state in the filter body, and a synthetic resin that connects the internal space of the filter body to the fuel suction port With a connector made of
Each of the gap forming member and the connector is provided with a joint portion that is joined to each other through a through hole formed in the filter body, and the inside of the joint portion is a fuel flow path,
The interval forming member has an interval forming projection below the joint, and the interval forming member and the connector can be welded between a position substantially above the interval forming projection and the fuel flow path. A fuel filter device characterized in that a welded portion between the two is positioned between them. The interval forming member and the connector are combined by fitting a protrusion provided on one of the interval forming member and the connector into a recess provided on the other,
2. The fuel filter device according to claim 1, wherein the welded portion is located at the fitting position.   The contact surface of the jig for ultrasonic welding, high-frequency welding, vibration welding, laser welding or spin welding is formed at the tip of the gap forming projection. The fuel filter device described in 1.   A plurality of gap forming protrusions are formed at the hole edge portion of the through hole of the gap forming member serving as a fuel flow path so as to be spaced from adjacent gap forming protrusions in the direction around the through hole. The fuel filter device according to claim 1, wherein the fuel filter device is a fuel filter device. A method for manufacturing a fuel filter device according to any one of claims 1 to 4,
After joining the joints of the gap forming member and the connector to each other through the through holes formed in the filter medium constituting the filter body,
A tool for ultrasonic welding, high-frequency welding, vibration welding, laser welding, or spin welding is brought into contact with the contact surface formed at the tip of the spacing projection to weld the spacing forming member to the connector. ,
Thereafter, the filter medium is formed into a bag shape, and a gap forming member is provided inside the filter body with a connector on the outside thereof.

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