JP2007077874A - Joining structure for articles - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent unexpected release of joining, in detachably joining a first member and a second member of synthetic resin which swell when the same are dipped in fuel. <P>SOLUTION: Since an engagement direction B and an engagement release direction A of a pair of locking arms 32b provided on a second member 32 in relation to a locking projection 31b provided on a first member 31 are set perpendicularly to a deformation direction C of the locking arm 32b due to swelling, a locking claw 32c of the locking arm 32b does not come off of the locking projection 31b even of the locking arm 32b touching fuel deforms in the C direction by swelling, and a joining condition of the first and the second members 31, 32 can be surely maintained. Since motion of the locking arm 32b in the locking release direction A is regulated by fitting a lock claw 31c provided on the locking projection 31b between the pair of the locking arms 32b, unexpected release of joining of the second members 31, 32 can be surely prevented. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an article coupling structure for detachably coupling a first member and a second member made of synthetic resin which are immersed in a liquid and swell, and the tip of a locking arm provided on the second member The locking claw relates to the one in which the coupling is achieved by elastically overcoming and engaging the locking projection provided on the first member.

Patent Document 1 below discloses an in-tank pump module that supplies fuel to an engine inside a synthetic resin fuel tank for automobiles. The coupling structure adopted in this pump module is a U-shape provided on the other member on the locking projection that protrudes radially outward from one member when two resin members are detachably coupled. By engaging the locking arms, the two members are joined together.
JP 2004-353467 A

  However, in the above-described conventional coupling structure, when the two resin members immersed in the fuel swell, the U-shaped locking arm of the other member moves in a direction away from the locking protrusion of the one member. There is a possibility that the locking arm is detached from the locking projection and the coupling is released.

  The present invention has been made in view of the above-described circumstances. When the first and second members made of synthetic resin that are immersed in the liquid and swell are detachably coupled, the coupling is unexpectedly released. The purpose is to prevent it reliably.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided an article coupling structure that detachably couples a first member and a second member made of synthetic resin that are immersed in a liquid and swell. The locking claw at the tip of the locking arm provided on the second member achieves coupling by elastically overcoming and engaging the locking projection provided on the first member. A locking claw capable of restricting movement of the locking arm in the disengagement direction while making the engagement direction and disengagement direction of the locking arm substantially orthogonal to the deformation direction due to swelling of the locking arm. An article coupling structure characterized by being provided on a stop projection is proposed.

  In addition, the holder 31 of an Example respond | corresponds to the 1st member of this invention, and the cap 32 of an Example respond | corresponds to the 2nd member of this invention.

  According to the configuration of the first aspect, the engagement direction and the engagement release direction of the locking arm of the second member with respect to the locking projection of the first member are substantially orthogonal to the deformation direction due to the swelling of the locking arm. Even if the locking arm is deformed due to swelling, the locking claw is not detached from the locking projection, and the coupled state of the first and second members can be reliably maintained. In addition, since the movement of the engagement arm in the disengagement direction is restricted by the lock claw provided on the engagement protrusion, it is possible to surely prevent the first and second members from being unexpectedly released.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.

  1 to 9 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a pump module, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 4 is an enlarged sectional view taken along line 4-4 in FIG. 2, FIG. 5 is an enlarged sectional view taken along line 5-5 in FIG. 3, FIG. 6 is an enlarged sectional view taken along line 6-6 in FIG. FIG. 8 is a perspective view when the holding part of the pressure regulator is connected, and FIG. 9 is an enlarged view in the 9 direction of FIG.

  As shown in FIGS. 1 to 4, an in-tank pump module 12 that supplies fuel to the engine is housed in a fuel tank 11 made of synthetic resin for automobiles. The pump module 12 includes a flange 13 that is detachably fixed to an opening 11 b formed in the upper wall 11 a of the fuel tank 11, and a container-like shape is formed at the lower ends of the two columns 14, 14 depending from the lower surface of the flange 13. The reservoir 15 is supported so as to be slidable up and down, and is biased downward by springs 16 and 16 attached to the outer circumferences of the columns 14 and 14. Therefore, even if the distance between the upper wall 11a and the lower wall 11c changes according to the change in the internal pressure of the fuel tank 11, the lower surface of the reservoir 15 can always abut against the upper surface of the lower wall 11c.

  A motor-integrated fuel pump 17 is disposed in the reservoir 15 in the vertical direction, and an arc-shaped filter case 18 is disposed so as to surround a part of the outer periphery thereof. The fuel pump 17 supplies the fuel sucked up through the strainer 19 to the upper end of the filter case 18 through the communication path 20, and the fuel purified by passing through the filter element 21 housed in the filter case 18 is pressure regulator 22. The engine 23 is supplied to the engine via the joint 23, the fuel duct 24 and the joint 25.

  As shown in FIG. 5, the unitized pressure regulator 22 is fitted into a synthetic resin holder 31 and is held by a synthetic resin cap 32 that is detachably mounted from below. The pressure regulator 22 includes a metal upper case 33 and a lower case 34, and an outer peripheral portion of the diaphragm 35 is sandwiched between the cases 33 and 34. A spring seat 36 and a valve body support member 37 are fixed to the inner peripheral portion of the diaphragm 35, and are urged upward by a valve spring 38 that is contracted between the bottom portion of the lower case 34 and the spring seat 36. A ball 40 fixed to a plate-like valve body 39 is supported by the valve body support member 37, and the valve body 39 is formed at the lower end of the valve seat 41 supported by the upper case 33 by the elastic force of the valve spring 38. Sit down. Two O-rings 42 and 43 and a backup ring 44 are arranged between the upper case 33 and the holder 31, and a cap ground 45 is arranged between the lower case 34 and the cap 32.

  The fuel purified by passing through the filter element 21 flows into the opening 46 of the upper case 33, flows from there through the path indicated by the arrow a, and is supplied to the engine via the joint 23, the fuel duct 24 and the joint 25 (see FIG. 1 to FIG. 3). Further, surplus fuel supplied from the opening 46 to the inside of the valve seat 41 along the path indicated by the arrow b lifts the valve body 39 against the elastic force of the valve spring 38, so that the upper part of the fuel is supplied upward. It is supplied to the jet pump 48 from the opening 47 of the case 31.

  As apparent from FIGS. 1 and 6, the jet pump 48 has a function of sucking the fuel outside the reservoir 15 into the interior in order to maintain the fuel level in the reservoir 15. That is, the jet pump 48 is detachably fitted to the upstream end of a fuel passage 49 provided at the bottom of the reservoir 15, and has an opening 50 communicating with fuel outside the reservoir 15 and an opening at the outlet of the pressure regulator 22. 47 (see FIG. 5) and an nozzle 51 through which fuel supplied from the opening 51 is ejected.

  Therefore, when the fuel supplied to the opening of the jet pump 48 by surplus in the pressure regulator 22 passes through the nozzle 52 and is ejected at a high speed, the fuel outside the reservoir 15 is fueled from the opening 50 by the negative pressure generated there. The passage 49 is sucked and supplied into the reservoir 15. A check valve 53 (see FIG. 1) is provided at the outlet of the fuel passage 49 extending from the jet pump 48 so that the fuel sucked into the reservoir 15 does not flow backward.

  1 and 2, reference numeral 54 denotes a liquid level sensor, and reference numeral 55 denotes a float of the liquid level sensor 54.

  Next, the coupling structure of the holder 31 and the cap 32 of the pressure regulator 22 will be described with reference to FIGS. 5 and 7 to 9.

  The holder 31 and the cap 32 are coupled by two first coupling portions 56 and 56 and one second coupling portion 57, and the total of the three coupling portions 54, 54, and 55 are the circles of the pressure regulator 22. They are arranged at intervals of 120 ° in the circumferential direction.

  The structure of the 1st coupling part 56 exists conventionally, The latching protrusion 31a which protruded on the outer peripheral surface of the holder 31, and the reverse U-shaped locking arm 32a which protruded upwards on the outer peripheral surface of the cap 32 When the cap 32 is inserted from the bottom upward toward the holder 31, the upper end of the locking arm 32a expands outward in the radial direction of the pressure regulator 22 and gets over the locking projection 31a. A match is achieved. Further, when the cap 32 is separated from the holder 31, the separation is achieved by pulling down the cap 32 while pulling the upper end of the locking arm 32a radially outward.

  Since the holder 31 and the cap 32 made of synthetic resin are immersed in the fuel, it is inevitable that the whole swells radially outward with the axis of the pressure regulator 22 as the center. In particular, the locking arm 32a of the cap 32 has a diameter. If it swells outward in the direction, the holder 31 may easily come off from the locking projection 31a. Therefore, in this embodiment, the second coupling portion 57 is added to prevent the cap 32 from falling off the holder 31.

  The second coupling portion 57 includes a U-shaped locking projection 31b protruding from the outer peripheral surface of the holder 31, a lock claw 31c protruding radially inward and upward from the inner surface of the outer periphery of the locking projection 31b, A pair of locking arms 32b, 32b protruding upward on the outer peripheral surface of the cap 32, and a locking claw protruding outward in the circumferential direction (in the direction of arrow B in FIG. 9) at the upper end of the locking arms 32b, 32b 32c and 32c.

  When the cap 32 is inserted from the bottom toward the holder 31, the locking claws 32 c, 32 c at the upper ends of the pair of locking arms 32 b, 32 b come into contact with both circumferential ends of the locking protrusion 31 b and approach each other. The lock claw 31c provided on the locking projection 31b is pushed by the upper ends of the pair of locking arms 32b and 32b and elastically deforms in the direction (arrow A direction in FIG. 9), and radially outward (arrow C in FIG. 9). The locking claws 32c, 32c get over the locking projection 31b and protrude upward by being elastically deformed in the direction). As a result, the pair of locking arms 32b, 32b expands outward in the circumferential direction (in the direction of arrow B in FIG. 9) by their own elasticity, and the locking claws 32c, 32c engage with the upper ends of the locking projections 31b. Coupling is achieved. In this coupled state, the lock claw 31c returned to the inside in the radial direction by its own elasticity is fitted between the upper ends of the pair of locking arms 32b and 32b, and the locking arms 32b and 32b approach each other (see FIG. 9 (in the direction of arrow A), the second coupling portion 57 can be reliably prevented from being separated by locking so as not to move (see FIG. 9A).

  In order to release the coupling of the second coupling portion 57, the upper ends of the pair of locking arms 32b and 32b are brought closer to each other while the upper end of the lock claw 31c is pulled radially outward (in the direction of arrow C in FIG. 9). The cap 32 may be pulled downward with respect to the holder 31 while moving in the direction of movement (the direction of arrow A in FIG. 9) (see FIG. 9B).

  The pair of locking arms 32b and 32b of the second coupling portion 57 tends to be deformed radially outward (in the direction of the arrow C in FIG. 9) by swelling, but a pair of locking arms 32b and 32b are released in order to release the engagement with the locking protrusion 31b. The locking arms 32b and 32b need to move in a direction approaching each other (in the direction of arrow A in FIG. 9), and therefore, the coupling of the second coupling portion 57 is not released by swelling. In addition, even if the pair of locking arms 32b and 32b try to move in the direction in which they approach each other (the direction of arrow A in FIG. 9), the lock claw 31c regulates the approach of the pair of locking arms 32b and 32b. The coupling of the coupling portion 57 is more reliably maintained.

  Thus, even in the fuel that swells the synthetic resin, the cap 32 can be securely coupled to the holder 31 of the pressure regulator 22, so that the pressure of the fuel in the pressure regulator 22 causes the cap 32 to be held in the holder. Even if it acts so as to be separated from the cap 31, the cap 32 can be prevented from falling off.

  Although the embodiments of the present invention have been described above, various design changes can be made without departing from the scope of the present invention.

  For example, in the embodiment, the coupling structure of the holder 31 and the cap 32 of the pressure regulator 22 has been described. However, the present invention can be applied to a coupling structure of any other member.

Longitudinal section of pump module 2-2 sectional view of FIG. 3-3 sectional view of FIG. 4-4 enlarged cross-sectional view of FIG. FIG. 5 is an enlarged sectional view taken along line 5-5. 6-6 enlarged sectional view of FIG. Perspective view when pressure regulator holding part is not connected Perspective view when holding the pressure regulator holding part 9 direction enlarged arrow view of FIG.

Explanation of symbols

31 Holder (first member)
31b Locking protrusion 31c Lock claw 32 Cap (second member)
32b Locking arm 32c Locking claw A Locking arm disengagement direction B Locking arm engagement direction C Deformation direction due to swelling

Claims (1)

A coupling structure of an article for detachably coupling a first member (31) and a second member (32) made of a synthetic resin which are immersed in a liquid and swell, and are provided on the second member (32). The locking claw (32c) at the tip of the stop arm (32b) achieves coupling by elastically overcoming and engaging the locking projection (31b) provided on the first member (31).
The engagement direction (B) and the disengagement direction (A) of the locking arm (32b) are substantially orthogonal to the deformation direction (C) due to the swelling of the locking arm (32b), and the locking arm (32b) An article coupling structure characterized in that a locking claw (31c) capable of restricting movement in the disengagement direction (A) of (32b) is provided on the locking projection (31b).

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