JP2007090955A - Inlet check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve which does not cause a seal defect when a seal member of the check valve is swollen with fuel. <P>SOLUTION: The check valve 7 is seated on a valve seat 513 formed on a check valve body 50 of an inlet check valve 1, and thus comprises a seal member 71 for preventing the fuel from flowing, a valve body 70 for holding the seal member 71 to be able to insert, and a plate 72 for regulating the seal member 71 by gripping the same with the valve body 70. A gripped part 713 and a regulation part 723 are formed on the seal member 71 and the valve body 70 or the plate 72. When the seal member 71 is gripped with the valve body 70 and the plate 72, a void S is formed between the gripped part 713 and the regulation part 723. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an inlet check valve that prevents backflow of fuel from a fuel tank.

  An inlet check valve is provided in the fuel tank to prevent backflow of fuel from the tank. FIG. 5 shows an axial cross-sectional view of the inlet check valve described in Patent Document 1. As shown in FIG. The inlet check valve 100 includes a case 110, a check valve 120, a spring 130, and a case bottom 140. The case 110 is formed with a seat portion 111 on which the seal portion 121A of the seal member 121 provided in the check valve 120 is seated.

  The check valve 120 includes a seal member 121, a cap 122 and a housing 123. The seal member 121 includes a seal portion 121A, a base portion 121B, and a sandwiched portion 121C in which a part of the base portion 121B is thickened, and the sandwiched portion 121C includes a guide surface 121Ca that engages with the housing 123. The cap includes a support portion 122 </ b> A that supports the seal member 121 and an engagement hole 122 </ b> B that engages with the engagement portion 123 </ b> C of the housing 123. The housing 123 includes a cylindrical portion 123A, a pressing portion 123B that holds the seal member 121 between the support portion 122A, and an engaging portion 123C. The pressing portion 123B engages with the guide surface 121Ca of the held portion 121C. A restriction surface 123Ba is formed. As described above, the check valve 120 holds the seal member 121 between the cap 122 and the plate 123, and the guide surface 121Ca and the regulation surface 123Ba are engaged to prevent the seal member 121 from being displaced outward in the radial direction. is doing.

However, in this configuration, since there is no gap between the guide surface 121Ca and the regulation surface 123Ba, when the seal member 121 swells due to fuel, the guide surface 121Ca comes off from the regulation surface 123Ba, and the seal portion 121A and the seat portion 111 There is a possibility of causing a sealing failure between the two.
JP 2004-028043 A

  An object of the present invention is to provide an inlet check valve that does not cause a sealing failure.

  In order to solve the above problems, an inlet check valve according to the present invention is an inlet check valve having a check valve that prevents a backflow of fuel from a fuel tank to a filler pipe, and the check valve is an inlet check valve. A seal member that prevents the outflow of fuel by being seated on a valve seat formed on the check valve body, a valve body that holds the seal member in an insertable manner, and sandwiches the seal member with the valve body The seal member has a base portion and a sandwiched portion formed on the base portion, and the sandwiched portion is pressed and clamped on at least one of the valve body and the plate. A pressing portion, and the pressing portion includes a restricting portion adjacent to the sandwiched portion, and when the seal member is sandwiched between the valve body and the plate, the restricting portion and the sandwiched portion are radially outside. A gap is formed between , Characterized by.

  In the inlet check valve according to the present invention, the seal member is seated on a valve seat provided in the check valve body, thereby preventing the backflow of fuel from the fuel tank. Here, the position of the seal member is regulated by being sandwiched between the valve body that holds the seal member and the plate. When the seal member is sandwiched between the valve body and the plate, the sandwiched portion and the restricting portion are disposed radially outward from the seal member and the valve body or plate, and a gap is formed therebetween. With this configuration, even if the seal member swells with fuel and the volume of the seal member increases, the seal member can be absorbed by the air gap, so that the seal member does not get over the restricting portion. Further, even if the seal member is swollen by the fuel and the axis is displaced, the guide portion of the seal member is engaged with the restricting portion, and the seal member is not locally deformed. Therefore, since the sealing member acts so as to swell uniformly, the sealing performance can be ensured.

  The valve body is formed with an engaging claw that allows the seal member to be clamped by engaging with the plate, and the seal member has an insertion hole that can be inserted into the valve body. If the inner diameter of the insertion hole is larger than the outer diameter of the engaging claw, the assembly workability for assembling the seal member to the valve body is improved.

Hereinafter, embodiments of the inlet check valve of the present invention will be described.
(1) First Embodiment First, the configuration of the inlet check valve of the first embodiment will be described. FIG. 1 shows a mounting view of the inlet check valve of the present embodiment. As shown in FIG. 1, the inlet check valve 1 is disposed so as to block an attachment port 20 opened in the fuel tank 2. A filler pipe 3 is connected to the upstream side of the inlet check valve 1. An inlet pipe 40 is connected to the upstream side of the filler pipe 3. The upstream portion of the inlet pipe 40 protrudes into an inlet box 41 that is recessed in the vehicle panel 43. A fuel filler opening (not shown) is opened at the upstream end of the inlet pipe 40. An oil supply cap 42 is screwed into the oil supply port. Fuel is supplied to the fuel tank 2 from the fuel supply port via the inlet pipe 40, filler pipe 3, and inlet check valve 1. A check valve, which will be described later, is arranged inside the inlet check valve 1. For this reason, there is no possibility that the fuel flows backward.

  FIG. 2 shows an axial cross-sectional view of the inlet check valve of the present embodiment. As shown in FIG. 2, the inlet check valve 1 includes a check valve body 5, a flange 6, and a check valve 7. The check valve body 5 includes a protruding portion 50 and a housing portion 51. The protruding portion 50 includes an inner peripheral portion 500 and an outer peripheral portion 501.

  The inner peripheral portion 500 is made of PA (polyamide) and has a cylindrical shape. A connecting end 502 is disposed at the protruding end of the inner peripheral portion 500. An annular rib 503 having a triangular cross section is formed on the outer peripheral surface of the inner peripheral portion 500. The annular ribs 503 are arranged in a total of three rows side by side in the axial direction of the inner peripheral portion 500. The inner peripheral portion 500 is press-fitted into the resin filler pipe 3. The annular rib 503 is in pressure contact with the inner peripheral surface of the filler pipe 3.

  The outer peripheral part 501 is made of adhesive PE (maleic acid-modified polyethylene) and has a cylindrical shape. Adhesive PE and PA are chemically bonded by primary molding of the outer peripheral portion 501 and secondary molding of the inner peripheral portion 500. A rubber O-ring 504 is mounted on the outer peripheral surface of the protruding end of the outer peripheral portion 501. The O-ring 504 is in elastic contact with the inner peripheral surface of the filler pipe 3. The rigidity of the outer peripheral part 501 is set lower than the rigidity of the inner peripheral part 500.

  The accommodating part 51 is made of PA containing glass and has a cylindrical shape. A direction end connecting the protruding portion 50 of the accommodating portion 51 is welded to the inner peripheral portion 500. An open end 510 is disposed at the other end of the accommodating portion 51. Further, a valve support piece 511 projects from the inner peripheral surface of the accommodating portion 51 in the inner diameter direction. A total of three valve support pieces 511 are arranged at intervals of 120 °. The three valve support pieces 511 are coupled at the center of the diameter of the accommodating portion 51. A valve support hole 512 is formed in the axial center in the axial direction. A ring-shaped valve seat 513 is disposed on the open end 510 side of the valve support piece 511.

  The check valve 7 includes a valve body 70, a seal member 71, a plate 72, a pressing member 73, a spring receiving member 74, and a spring 75. The valve body 70 is made of POM (polyoxymethylene) and has a trumpet shape having an enlarged diameter portion 700 on the open end 510 side. The valve body 70 is inserted into the valve support hole 512. The spring receiving member 74 is made of PA and has a cylindrical shape. The spring receiving member 74 is attached and fixed to the end of the valve body 70 in the direction of the connection end 502. A metal spring 75 is interposed between the spring receiving member 74 and the valve support piece 511.

  An engagement portion 701 and a support portion 702 are formed on the enlarged diameter portion 700 of the valve body 70. A total of four engaging claws 701a are arranged at the distal end of the engaging portion 701 at intervals of 90 °. The seal member 71 is made of rubber and has a ring shape. The seal member 71 is mounted on the outer peripheral side of the engaging portion 701 in the enlarged diameter portion 700. The seal member 71 can be attached to and detached from the valve seat 513. The plate 72 is made of POM and has a ring shape, and is juxtaposed on the open end 510 side of the seal member 71. The plate 72 is locked to the engaging claw 701a. The seal member 71 is positioned by this locking. The pressing member 73 is made of POM and has a ring shape with reinforcing ribs in a cross shape. The pressing member 73 is press-fitted on the inner peripheral side of the engaging portion 701 in the enlarged diameter portion 700. The pressing member 73 suppresses the engagement portion 701 from bending toward the inner peripheral side. The check valve 7 is urged by a spring 75 in a direction in which the seal member 71 is seated on the valve seat 513. The check valve 7 is opened by the fuel pressure only in the direction from the connection end 502 toward the open end 510 as indicated by a two-dot chain line in the figure.

  The flange 6 is formed by increasing the diameter of the base portion of the outer peripheral portion 501. The flange 6 is welded to the edge of the mounting port 20 of the fuel tank 2 made of PE (polyethylene).

  FIG. 3 shows an enlarged view in FIG. As shown in FIG. 3, the seal member 71 includes a seal portion 711 and a base portion 712 that are seated on the valve seat 513. The base portion 712 is formed with a sandwiched portion 713 that is partially thick, and a side surface thereof serves as a guide surface 713a. The plate 72 includes a pressing portion 721 that presses and holds the sandwiched portion 713 of the seal member 71 with the valve body 70 (support portion 702), and a cylindrical portion 722 that engages with the engaging claw 701a. The pressing portion 721 is formed with a restricting portion 723 that restricts the outward movement of the seal member 71 in the radial direction by a predetermined amount or more, and a side surface thereof is a restricting surface 723a. The seal member 71 is disposed such that a gap S is formed between the guide surface 713a and the restriction surface 723a when sandwiched between the valve body 70 and the plate 72. With this configuration, even if the seal member 71 is swollen by the fuel and the volume of the seal member 71 increases, the seal member 71 can be absorbed by the gap S, so that the seal member 71 does not get over the restricting portion 723. Further, since the gap S, the restricting portion 723, and the guide portion 713 are configured, even if the seal member 71 is swollen by the fuel and the axis is displaced, the guide surface 713a of the seal member 71 is engaged with the restricting surface 723a. Thus, the seal member 71 is not locally deformed. That is, since the sealing member 71 acts so as to swell uniformly, the sealing performance can be ensured.

Further, an insertion hole 713 b that allows the seal member 71 to be inserted into the valve body 70 is formed at a position adjacent to the sandwiched portion 712 of the seal member 71. The inner diameter of the insertion hole 713b is larger than the outer diameter of the engaging claw 701a of the engaging portion 701. Thereby, when inserting the sealing member 71 in the valve body 70, interference with the sealing member 71 and the engaging claw 701a can be prevented, and the assembly workability is excellent.
(2) Second Embodiment The second embodiment is an embodiment related to an inlet check valve (1B) in which a spring 75B is arranged in the opening direction of the reversely supported valve 7B and is shown in FIG. The check valve 7B includes a valve body 70B, a seal member 71B, a plate 72B, a spring receiving member 74B, and a spring 75B. The spring receiving member 74B is made of POM and has a cylindrical shape. The spring receiving member 74B is fixed to the open end 510B of the accommodating portion 51B. A metal spring 75B is interposed between the spring receiving member 74B and the plate 72B, and the check valve 7B is biased by the spring 75B in the direction in which the seal member 71B is seated on the valve seat 513B. . Further, the plate 72B is positioned by engaging with the engaging claw 701Ba of the valve body 70B. As in the first embodiment, the sealing member 71B is formed with a sandwiched portion 713B on the base portion 713B, and a side surface thereof is a guide surface 713Ba. The valve body 70B having the engagement claw 701Ba (engagement portion 701B) is formed with a pressing portion 703B and a restriction portion 704B for pressing and holding the sandwiched portion 713B (base portion 712B) of the seal member 71B, and the side surface thereof is a restriction surface. It is 704Ba. When the seal member 71B is sandwiched between the valve body 70B and the plate 72B, the gap S is disposed between the guide surface 713Ba (held portion 713B) and the regulation surface 704Ba (regulation portion 704B). ing. About the effect, it is the same as 1st embodiment.

  The present invention is not limited to the above embodiment, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible. In the above embodiment, the sandwiched portion and the restricting portion are formed on either the seal member 71, the valve body 70, or the plate 72. However, the present invention is not limited to this, and the sandwiched portion is formed on the front and back of the seal member 71. In addition, the valve body 70 and the plate 72 may be provided with a restriction portion.

It is an attachment figure of the inlet check valve of a first embodiment. It is an axial sectional view of the inlet check valve of the first embodiment. 2 is an enlarged view in circle A. FIG. It is an axial direction halfway valve figure of the inlet check valve of 2nd embodiment. It is an axial sectional view of a conventional inlet check valve.

Explanation of symbols

  1: Inlet check valve, 2: Fuel tank, 20: Mounting port, 3: Filler pipe (pipe), 30: Rubber hose, 40: Inlet pipe, 41: Inlet box, 42: Refueling cap, 43: Vehicle panel, 5 : Check valve body, 50: protrusion, 500: inner periphery, 501: outer periphery, 502: connection end, 503: annular rib, 504: O-ring, 51: housing portion, 510: open end, 511: valve Support piece, 512: valve support hole, 513: valve seat, 6: flange, 7: check valve, 70: valve body, 700: expanded diameter portion, 701: engagement portion, 701a: engagement claw, 702: support Part, 71: seal member, 711 seal part, 712: base part, 713: sandwiched part, 713a: guide surface, 713b: insertion hole, 72: plate, 721: pressing part, 722: cylindrical part, 723: restricting part, 723a: Regulation , 73: pressing member, 74: spring receiving member, 75: spring, S: void, the pressing portion: 703B, regulating unit: 704B

Claims (2)

In the inlet check valve (1) having a check valve (7) for preventing the back flow of fuel from the fuel tank to the filler pipe,
The check valve (7) is seated on a valve seat (513) formed on the check valve body (5) of the inlet check valve (1), thereby preventing the fuel from flowing out. When,
A valve body (70) for holding the seal member (71) in an insertable manner;
The seal member (71) is composed of a plate (72) that restricts the position by clamping the valve member (70) with the valve body (70). (713)
At least one of the valve body (70) and the plate (72) includes a pressing portion (721, 703B) for pressing and clamping the sandwiched portion,
The pressing portion (721, 703B) has a restriction portion (723, 704B) adjacent to the sandwiched portion,
When the seal member (71) is sandwiched between the valve body (70) and the plate (72), a gap is formed between the restricting portion (723, 704B) and the radially outer side of the sandwiched portion (713). (S) is formed,
Inlet check valve characterized by. The valve body (70) is formed with an engaging claw (701a) that allows the sealing member (71) to be clamped by engaging with the plate (72).
An insertion hole (713b) that can be inserted into the valve body (70) is formed in the seal member (71),
An inner diameter of the insertion hole (713b) is larger than an outer diameter of the engaging claw (701a);
The inlet check valve according to claim 1.