WO2015145694A1

WO2015145694A1 - Non-return valve of fuel filler tube

Info

Publication number: WO2015145694A1
Application number: PCT/JP2014/059003
Authority: WO
Inventors: 博光吉田
Original assignee: 株式会社アステア
Priority date: 2014-03-27
Filing date: 2014-03-27
Publication date: 2015-10-01
Also published as: JPWO2015145694A1; JP6408560B2

Abstract

[Problem] To enable a non-return valve to be assembled in a simple manner by reducing the number of components of the non-return valve. Material costs and costs incurred in assembly work are thereby reduced. Also to ensure that a flapper of the non-return valve does not mistakenly fall off. [Solution] A non-return valve of a fuel filter tube comprising a body attached to a filler tube, and a flapper for opening and closing an opening of the filler tube by being rotatably attached to the body, in which: the body is a member obtained by integrally molding a fitting part of a rotating shaft and bearing, and an elastic member for pushing the flapper in a closing direction, the elastic member being connected at one end to the body and free at the other end; the flapper is a member provided with a lid part for opening and closing an opening of the filler tube, and a fitting part of a rotating shaft and bearing; the flapper is rotatably assembled on the body by fitting together the body-side fitting part and the flapper-side fitting part; and the elastic member pushes the flapper in the closing direction when the flapper has turned in the opening direction.

Description

Check valve for fuel supply pipe

The present invention relates to a check valve that prevents back flow of fuel.

When refueling an automobile, a refueling nozzle is inserted into the refueling port, and fuel is poured into the fuel tank through a refueling pipe connected to the refueling port. Since the fuel is vigorously supplied from the fuel filler nozzle, when the liquid level in the fuel tank becomes high, the fuel may flow backward through the fuel filler pipe and overflow from the fuel filler port.

In order to prevent the backflow of fuel, a check valve is attached to the fuel supply pipe. For example, Patent Document 1 discloses a check valve including an insertion portion for a fuel supply pipe and a valve body. The valve body is pressed against the opening of the insertion portion by a torsion coil spring. When the fuel flows in from the proximal end of the insertion portion, the valve body pressed against the opening at the distal end is pushed open by the pressure of the fuel to allow the passage of the fuel. On the other hand, since the opening at the distal end of the insertion portion is blocked by the valve body, fuel does not flow into the insertion portion from the distal end side.

Patent Document 2 discloses a check valve including a body and a valve plate. The body is a cylindrical body and is fitted into the oil supply pipe. The valve plate is attached to the opening at the front end of the body, and opens and closes the opening at the front end of the body by elastic deformation of a mounting portion (reference numeral 44k) illustrated in FIG. When the fuel flows from the base end of the body, the fuel is pushed against the opening at the front end to push the valve plate, thereby deforming the mounting portion and allowing the fuel to pass. On the other hand, since the valve body is supported by the support protrusion (reference numeral 38), it is difficult for the fuel to flow into the body from the front end side.

Patent Document 3 discloses a check valve including a tubular body, a flapper, and a torsion spring. A tubular body is fitted into the end of the oil supply pipe, and the flapper is pressed against the opening at the end of the oil supply pipe with a torsion coil spring.

Japanese Patent No. 3656691 Japanese Patent No. 3152100 Japanese Patent No. 4103049

The check valves of Patent Documents 1 and 3 have a configuration in which a valve body is pressed in a direction to close a flow path of an oil supply pipe using a torsion coil spring. Since these check valves use torsion coil springs, the number of parts is large and the assembly work is complicated. The check valve of Patent Document 2 seems to employ a thin metal leaf spring as the mounting portion (reference numeral 44k). Since the leaf spring is stamped and formed by press working, it is presumed that the end portion is sharp. Therefore, it is necessary to take care not to injure the worker during the assembling work, and the assembling work is also complicated.

The present invention allows the flapper to be easily assembled to the body by reducing the number of check valve components. This reduces the material cost and the cost required for the assembly work. Furthermore, the elastic body of the check valve is prevented from dropping off accidentally.

The present invention is a check valve for a fuel supply pipe comprising a body attached to the fuel supply pipe and a flapper that opens and closes the opening of the fuel supply pipe by being rotatably attached to the body. The body is a member formed by integrally forming a fitting portion of the rotating shaft and the bearing, and an elastic body having one end connected to the body and the other end being a free end and pressing the flapper in the closing direction. The flapper is a member that includes a lid portion that opens and closes an opening of the oil supply pipe, and a fitting portion of the rotating shaft and the bearing. By fitting the fitting part on the body side and the fitting part on the flapper side, the flapper is rotatably assembled to the body, and the elastic body presses the flapper in the closing direction when the flapper is rotated in the opening direction. To do. In the check valve of the present invention, the body-side fitting portion and the elastic body are integrally formed, and the flapper is pressed in the closing direction by the elastic body. Thereby, it is not necessary to assemble a conventionally used coil spring to the check valve, and the number of parts can be reduced. Moreover, since the elastic body is integrally formed with the body, there is no possibility that the elastic body will fall off accidentally.

In the above-described check valve, the flapper is preferably configured by integrally forming a lid portion and a fitting portion on the flapper side. Thereby, the number of parts can be further reduced, and the assembling work can be simplified.

In a state where the body-side fitting portion and the flapper-side fitting portion are fitted together, it is preferable to dispose the free end of the elastic body on the rotation locus when the flapper opens. By comprising in this way, when a flapper opens, a part of flapper can be reliably made to contact with the free end of an elastic body. When the flapper opens, the elastic body is distorted with the free end as the power point. As a result, the flapper is subjected to a stress that attempts to close the fuel filler opening. When refueling is finished, the flapper closes according to this stress.

In the above-described check valve, it is preferable that the free end of the elastic body is configured to include a push projection that presses the flapper. By providing the protrusion at the free end, the stress generated in the elastic body can be transmitted efficiently. As a result, the flapper can be closed quickly and reliably after refueling is completed.

The body and flapper are preferably composed of an oil-resistant fiber reinforced plastic. In general, the tip of the fuel supply pipe is inserted into the fuel tank. Powder coating is applied to the fuel tank to prevent rust. At this time, the temperature in the fuel tank rises. In this case, the dimensional change of the check valve at a high temperature becomes a problem. If oil-resistant fiber reinforced plastic is used, it is possible to reduce the dimensional change, so that a check valve can be arranged at the tip of the oil supply pipe.

In the above check valve, the body-side fitting portion may be a bearing, and the flapper-side fitting portion may be a rotating shaft. The fitting part on the body side may be a rotating shaft, and the fitting part on the flapper side may be a bearing. In both cases, the bearing has a notch, and when the rotating shaft is pressed against the notch of the bearing, the bearing is elastically deformed and the rotating shaft is rotatably fitted to return to its original shape. Thus, it is preferable to prevent the rotating shaft from falling off. In both cases, the bearing may be configured in an annular shape. In this case, a support protrusion or a projecting plate connected to the rotating shaft constituting the bearing is elastically deformed, and the rotating shaft is rotatably fitted to the bearing. With this configuration, the flapper can be easily assembled to the body by pressing the flapper side or body side rotating shaft against the flapper side or body side bearing.

Conventionally, the flapper is pressed in the closing direction by a torsion coil spring or the like provided separately. In the present invention, the body is formed by integrally forming the fitting portion of the rotating shaft and the bearing and the elastic body having one end connected to the body and the other end being a free end and pressing the flapper in the closing direction. Since the elastic body is integrally formed, the number of parts can be reduced and the flapper can be assembled easily. And since the elastic body is shape | molded integrally, there is no possibility that an elastic body may fall off accidentally.

It is a fragmentary sectional view which shows the attachment position of the non-return valve of this invention. It is a perspective view which shows one Example of the non-return valve of this invention. It is a perspective view which shows the state which decomposed | disassembled the non-return valve of FIG. It is sectional drawing which cut | disconnected the check valve of FIG. 2 in the location corresponded to the AA part of FIG. 6 mentioned later. It is a bottom view which shows the mode before fitting the non-return valve and oil supply pipe | tube of FIG. It is a bottom view which shows a mode after fitting the non-return valve and oil supply pipe | tube of FIG. It is the perspective view which looked at the cross section cut | disconnected by the AA part of FIG. 6 from back. It is the perspective view which looked at the non-return valve of FIG. 2 from back. FIG. 5 is a cross-sectional view corresponding to FIG. 4 showing a state in which the flapper is opened. It is a perspective view which shows the 2nd Example of the non-return valve of this invention. It is a perspective view which shows the state which decomposed | disassembled the non-return valve of FIG. It is sectional drawing of the non-return valve of FIG. 5 shows a cross section corresponding to FIG. It is the perspective view which looked at the non-return valve of FIG. 10 from back. It is sectional drawing equivalent to FIG. 12 which shows the state which the flapper opened. It is a side view which shows the 3rd Example of the non-return valve of this invention. It is a perspective view which shows the state which decomposed | disassembled the non-return valve of FIG. It is sectional drawing cut | disconnected by the BB part of FIG. In FIG. 8, it is the perspective view which looked at the non-return valve which changed the support protrusion into cyclic | annular form from back. In FIG. 11, it is the perspective view which looked at the non-return valve which changed the support protrusion into cyclic | annular form from the front.

DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the drawings.

FIG. 1 shows a general fuel tank 1 (hereinafter simply referred to as a tank) and a fuel oil supply pipe 2 (hereinafter simply referred to as a fuel supply pipe). The oil supply pipe 2 includes a first pipe 11 located on the oil supply port side, a second pipe 12 located on the tank side, and a flexible hose 13 connecting the first pipe 11 and the second pipe 12. The check valve of the present invention has a hatched rectangular member in FIG. 1 and schematically shows the inside of the tip of the first pipe 11, the outside or inside of the tip of the second pipe 12, or the second It is used by being fitted inside the proximal end of the pipe 12. In FIG. 1, check valves are indicated by

reference numerals

3, 4, 5 and 6 in order from the fuel filler side. In the following description, the check valve 6 (FIGS. 1 to 9) and its modified examples (FIGS. 10 to 14 and 15 to 17) used by being fitted to the outside of the tip of the second pipe 12 will be described as examples. To do. In the check valve 6 according to FIGS. 1 to 9, the fitting portion 16 on the flapper side is a bearing 17, and the fitting portion 14 on the body side is a rotating shaft 15. In the check valve 7 according to FIGS. 10 to 14, the fitting portion 20 on the flapper side is the rotating shaft 21, and the fitting portion 18 on the body side is the bearing 19. As with the check valve 6, the check valve 7 is used by being fitted to the outside of the tip of the second pipe 12. In the check valve 8 according to FIGS. 15 to 17, the fitting portion 24 on the flapper side is the rotating shaft 25, and the fitting portion 22 on the body side is the bearing 23. The check valve 8 covers only a part of the tube surface on the distal end side of the second pipe 12. As with the check valve 6, the check valve 8 is used by being fitted to the outside of the tip of the second pipe 12.

The check valve 6 shown in FIGS. 1 to 9 will be described. This check valve 6 is used by fitting the body 26 to the outside of the tip of the second pipe 12. As shown in FIGS. 2 and 3, the check valve 6 includes a body 26 attached to the tip of the second pipe 12, and a flapper 27 that is rotatably supported by the body 26 and opens and closes the opening of the second pipe 12. Consists of. As shown in FIGS. 3 and 4, the body 26 and the flapper 27 are molded separately. This check valve is composed of two members, a body 26 and a flapper 27.

The body 26 of the check valve 6 has a cylindrical shape as shown in FIGS. 3 and 4 and has

openings

28 and 29 at the proximal end and the distal end. The tip of the body 26 is slanted. Then, as shown in FIGS. 5 to 7, the distal end of the second pipe 12 is fitted into the opening 28 on the proximal end side of the body 26 to fix the body 26 to the distal end of the second pipe 12.

The body 26 and the second pipe 12 are fixed by a fixing portion 30 provided on the body 26. As shown in FIGS. 5 to 7, the fixing portion 30 engages with an elastic fixing plate 31 provided in the body 26 and an engagement hole 32 provided in the elastic fixing plate 31 and provided in the second pipe 12. It consists of a protrusion 33 and a notch 34 surrounding the elastic fixing plate 31. When the body 26 is fitted into the tip of the second pipe 12, the elastic fixing plate 31 is elastically deformed and the protrusion 33 rides on the inner wall of the second pipe 12. When the body 26 is pressed against the tip of the second pipe 12 as it is, the projection 33 engages with the engagement hole 32 of the second pipe 12, and the body 26 and the second pipe 12 are fixed to each other. The protrusion 33 has an inclined surface at a location facing the second pipe 12, and the protrusion 33 has a shape that can easily ride on the inner wall of the second pipe 12. The fixing portion 30 is also preferably formed integrally with the body 26. The configuration of the fixing unit may be other configurations. A rib 35 is provided at the base end of the body 26. The ribs 35 are protrusions arranged on the peripheral surface of the body 26 and reinforce the rigidity of the body 26.

As shown in FIGS. 3 and 4, the body 26 is a member in which the rotating shaft 15 that functions as the rotating shaft and the fitting portion 14 of the bearing and the elastic body 36 are integrally formed. The rotating shaft 15 is an axis having a circular cross section. The rotating shaft 15 is connected to the peripheral surface of the body 26 via a support portion 37. The support portion 37 is a rectangular block, and the width thereof is configured to be smaller than the axial length of the rotating shaft 14. The width of the support portion 37 is configured to be approximately the same as the width between the inner walls of the support protrusions 39 provided on the connecting portion 38 of the flapper 27 (FIG. 8). For this reason, the left and right side walls of the support portion 37 function as a guide for stabilizing the rotation of the flapper 27. The elastic body 36 is an elastic plate having a rectangular shape in plan view. One end of the elastic body 36 is connected to the base end side of the body 26 via the connecting portion 40, and the other end is a free end. The connecting portion 40 protrudes from the base end of the body 26 in a direction perpendicular to the body axis. The elastic body 36 is provided at the tip of the connection portion 40 and passes over the rotary shaft 15. A substantially triangular push protrusion 41 is disposed at the tip of the elastic body 36 in a side view. The push protrusion 41 presses the connecting portion 38 of the flapper 27 when the flapper 27 is opened. The connecting portion 38 has a portion having the same inclined surface 44 as the lid portion 42 of the flapper 27 and a portion extending in the axial direction of the body 26. The connecting portion 38 functions as a hinge that connects the lid portion 42 and the body 26.

As shown in FIGS. 8 and 9, the flapper 27 is rotatably supported by the body 26 to open and close the opening at the tip of the second pipe 12. As shown in FIG. 4 with hatching, the flapper 27 of the check valve 6 of this embodiment includes a lid portion 42 that opens and closes the opening at the tip of the second pipe 12, a connecting portion 38, a rotating shaft, This is a member formed integrally with a bearing 17 that functions as the fitting portion 16 of the bearing. In the state where the flapper 27 and the body 26 are assembled, the pusher 41 of the elastic body 36 is positioned so as to cover the inclined surface 44 of the connecting portion 38. The bearing 17 includes a support protrusion 39 that protrudes from the end of the connecting portion 38. In this embodiment, as shown in FIG. 8, two sets of support protrusions 39 are provided in pairs so as to hold the rotary shaft 15 from above and below at the end of the connecting portion 38. That is, the number of support protrusions 39 is four. The upper support protrusions 39 may be connected so that the number of support protrusions is three. The plurality of support protrusions 39 constitute the bearing 17 and elastically deform when the rotating shaft 15 is pressed against the bearing insertion direction of the bearing 17 to receive the rotating shaft 15 rotatably. The plurality of support protrusions 39 return to the original shape and prevent the rotary shaft 15 from falling off. In a side view, the bearing 17 can be prevented from falling off by covering a portion exceeding half of the circumference of the shaft rod of the rotary shaft 15 with the support protrusion 39. At this time, if the notch 43 is set between the support protrusions 39, the support protrusion 39 is elastically deformed by fitting the rotation shaft 15 by pressing the notch 43 against the rotation shaft 15. The support protrusion 39 returns to its original shape, and the bearing 17 (flapper 27) can be prevented from falling off. Thus, in the check valve 6 of the present embodiment, the rotary shaft 15 can be easily fitted into the bearing 17 by pressing the notch 43 against the rotary shaft 15. As shown in FIG. 18, the support protrusion 63 may cover the entire circumference of the shaft rod. That is, the support protrusion 63 can be annular. In this case, the rotation shaft 15 and the bearing 17 can be fitted together by elastically deforming the support protrusion 63 in the axial direction of the rotation shaft 15 and inserting the rotation shaft 15 into an annular bearing.

As described above, the pusher 41 of the elastic body 36 is positioned so as to cover the inclined surface 44 of the connecting portion 38 (FIGS. 2 and 4). In a state where the fitting portion 14 on the body side (rotating shaft 15 in this embodiment) and the fitting portion 16 on the flapper side (bearing 17 in this embodiment) are fitted together, the rotation locus is on the rotation locus when the flapper 27 is opened. Since the free end of the elastic body 36 is disposed, when the flapper 27 is opened, a force for closing the flapper 27 is applied. A push protrusion 41 is provided at the free end, and the push protrusion 41 of the elastic body 36 is positioned on the inclined surface 44 of the connecting portion 38. As shown in FIG. 9, the inclined surface 44 is integrally inclined when the lid portion 42 of the flapper 27 is opened. After the refueling is completed and the fuel does not flow, the push protrusion 41 presses the inclined surface 44 of the flapper 27, and the flapper 27 is quickly closed.

Since the check valve 6 is in contact with gasoline or light oil, it is made of a material having oil resistance. When the check valve 6 is installed at the

position

5 or 6 in FIG. 1, that is, in the tank 1, it is preferable to use a material having oil resistance and heat resistance. When the tank 1 is formed of a metal material, a rust preventive paint is applied, but the

check valves

5 and 6 may be deformed by heat from powder coating (for example, 120 to 180 ° C. for 20 to 30 minutes). It is. Examples of the material having oil resistance include plastic materials such as polyacetal, high-density polyethylene, and nylon. Examples of the material having oil resistance and heat resistance include fiber reinforced plastic obtained by blending reinforced fibers with synthetic resin such as polyacetal, high density polyethylene, or nylon. Examples of the reinforcing fiber include glass fiber or carbon fiber. The check valve 6 shown in FIGS. 1 to 9 is made of glass fiber reinforced nylon for both the body 26 and the flapper 27. Although glass fiber reinforced nylon is a hard material, it is possible to give the elastic body 36 appropriate elasticity by changing the length and thickness of the elastic body 36. That is, the check valve of the present invention can achieve both the hardness necessary for exhibiting heat resistance and the elasticity for closing the flapper.

As shown in FIG. 9, when fuel flows in from the opening 28 on the base end side of the body 26, the flapper 27 is pushed open in the direction of the arrow by the pressure of the fuel. When the inflow of the fuel is stopped, the flapper 27 returns to the original position by the elasticity of the elastic body 36 as shown in FIG. When the fuel flows backward, the fuel tries to flow into the body from the opening 29 on the front end side of the body 26, but the flapper 27 is pressed and closed by the push protrusion 41 of the elastic body 36, so Backflow is blocked.

The modification shown in FIGS. 10 to 14 will be described. The check valve 7 of the present embodiment is different from the check valve 6 only in the fitting portion of the rotating shaft and the bearing. The same reference numerals are used in the drawings for members common to the check valve 6 and the check valve 7. Specifically, as shown in FIG. 11, in the check valve 7, a bearing 19 (fitting part 18) is provided on the peripheral surface of the body 26, and the rotary shaft 21 (fitting part 20) is attached to the flapper 27. Provide. The bearing 19 is connected to the peripheral surface of the body 26 via the support portion 45. The support portion 45 is a rectangular block, and the width thereof is the same as the width of the bearing 19. The widths of the support portion 45 and the bearing 19 are configured to be approximately the same as the width between the inner walls of the protruding plate 46 provided at the connecting portion 38 of the flapper 27 (FIG. 13). The protruding plates 46 are provided in a pair of relations at the left and right ends of the connecting portion 38 and protrude toward the base end of the body 26. The inner wall of the protruding plate 46 is in contact with the left and right side walls of the support portion 45. For this reason, the protruding plate 46 and the support portion 45 function as a guide that stabilizes the rotation direction.

As shown in FIGS. 11 and 12, the bearing 19 includes a support protrusion 47 that protrudes from the upper end of the support portion 45. In the present embodiment, one support protrusion 47 is provided so as to hold the rotating shaft 21 from the base end side of the body 26. A plurality of support protrusions may be arranged separately in the width direction. The support protrusion 47 constitutes the bearing 19. When the rotary shaft 21 is pressed against the bearing insertion direction of the bearing 19, the rotary shaft 21 is rotatably received by elastic deformation. And the support protrusion 47 returns to the original shape and prevents the rotating shaft 21 from falling off. In a side view, by allowing the support protrusion 47 to cover a portion that exceeds half the circumference of the shaft rod of the rotating shaft 21, it is possible to prevent the rotating shaft 21 from falling off. At this time, if the notch 48 is set between the support protrusions 47, the support protrusion 47 is elastically deformed and the rotation shaft 21 is fitted by pressing the rotation shaft 21 against the notch 48 of the support protrusion 47. Can do. After the fitting, the support protrusion 47 returns to the original shape, and the rotation shaft 21 (the flapper 27) can be prevented from falling off. Thus, in the check valve 7 of this embodiment, the rotary shaft 21 can be easily fitted into the bearing 19 by pressing the rotary shaft 21 against the notch 48. As shown in FIG. 19, the support protrusion 64 may cover the entire circumference of the shaft rod. That is, the support protrusion 64 can be annular. In this case, the rotating shaft 21 and the bearing 19 can be fitted together by elastically deforming the protruding plate 46 connecting the rotating shaft 21 in the axial direction of the rotating shaft 21 and inserting the rotating shaft 21 into the annular bearing 19. it can.

The rotating shaft 21 of the check valve 7 is a pair of cylindrical protrusions (see FIG. 11). That is, the rotation shaft is not a single continuous shaft rod, but is interrupted in the middle of the axial direction. The rotating shaft 21 is provided inside a protruding plate 46 provided at the end of the connecting portion 38 of the flapper 27. The rotating shaft may be configured as a single continuous rod. However, when the bearing is annular as described above, the pair of columnar protrusions must be formed so that the rotating shaft can be elastically deformed in the axial direction.

The modification shown in FIGS. 15 to 17 will be described. The same reference numerals are used in the drawings for members common to the check valve 6, the check valve 7, and the check valve 8. The

check valves

6 and 7 shown in FIGS. 1 to 9 and FIGS. 10 to 14 have a cylindrical body. The shape of the body is not limited to a cylindrical shape, and may be a shape that covers a part of the peripheral surface of the second pipe 12 as shown in FIGS. 15 to 17. Regarding the body 49 of the check valve 8 of this embodiment, the bearing 23 formed of the support protrusion 62 and the elastic body 36 having one end connected to the base end of the body 49 and the other end being a free end are integrally formed. Then, it is the same as the check valve 7. Further, it is the same as the check valve 8 in that the lid portion 51 of the flapper 50 and the rotating shaft 25 functioning as the fitting portion 24 on the flapper side are integrally formed. The rotating shaft 25 protrudes from a pair of left and right protruding plates 61. The protruding plate 61 protrudes from the connecting portion 57 of the flapper to the base end side of the body 49. The bearing 23, which is the fitting portion 22 on the body 49 side, includes a single support protrusion 62. The support protrusion 62 has a notch 60. The function of the notch 60 is the same as that of the notch 48. The width of the support protrusion 62 is substantially the same as the dimension between the inner walls of the pair of protrusions 61. The support protrusion 62 functions as a guide for the flapper 50. As described above, the relationship between the rotary shaft 25 and the bearing 23 is not significantly different from that of the check valve 7.

However, the check valve 8 of this embodiment is different from the check valve 7 in that it includes a fixing portion 55 including a pair of arms 53 extending from the block 52 to the left and right and an engagement claw 54 provided at the tip of the arm 53. Is different. The block 52, the arm 53, and the engaging claw 54 are formed integrally with the body 49. As shown in the sectional view of FIG. 17, the engaging claw 54 engages with the engaging hole 56 provided in the second pipe 12 to fix the body 49 to the second pipe 12. Further, the lid 51 of the flapper 50 of the check valve 8 of the present embodiment is also different in that it is substantially perpendicular to the second pipe 12. Furthermore, the structure of the connecting portion 57 is also different. The connecting portion 57 has a perpendicular surface 58 that is perpendicular to the axial direction of the second pipe 12 and a parallel surface 59 that is parallel to the axial direction. The free end of the elastic body 36 has a push projection 41. When the flapper 50 rotates in the opening direction, the parallel surface 59 is pushed by the push protrusion 41. When there is an inflow of fuel from the base end side of the body 49, the check valve 8 opens as in FIG. When the fuel flows backward, since the flapper 50 is closed by the elastic body 36, the fuel backward flow is blocked.

As described above, in the check valve according to the present invention, since the elastic body 36 is integrally formed with the

bodies

26 and 49, there is no possibility that the elastic body falls off. Since the

bodies

26 and 49 and the

flappers

27 and 50 are fitted together at the fitting portion, there is no possibility that the

flappers

27 and 50 are accidentally dropped due to inflow of fuel or the like. Since the

flappers

27 and 50 and the

bodies

26 and 49 are assembled by fitting the shaft and the bearing, the assembling work is also easy.

1 Tank 2 Oil Supply Pipe 6 Check Valve (First Example)
7 Check valve (second embodiment)
8 Check valve (Third embodiment)
11 1st pipe 12 2nd pipe 13 Flexible hose 14 Fitting part (1st Example)
15 Rotating shaft (first embodiment)
16 Fitting part (first embodiment)
17 Bearing (first embodiment)
18 Fitting part (second embodiment)
19 Rotating shaft (second embodiment)
20 Fitting part (second embodiment)
21 Bearing (second embodiment)
22 Fitting part (3rd Example)
23 Rotating shaft (Third embodiment)
24 fitting part (3rd Example)
25 Bearing (Third embodiment)
26 Body 27 Flapper 36 Elastic body 37 Supporting part (first embodiment)
38 connecting portion 39 support protrusion (first embodiment)
40 connecting portion 41 pushing projection 42 lid portion 43 notch 44 inclined surface 45 support portion (second embodiment)
46 Projection plate 47 Support projection (second embodiment)
48 Notch (second embodiment)
49 Body (Third Example)
50 Flapper (Third embodiment)
51 Lid (Third Example)
53 Arm 54 Engagement Claw 56 Engagement Hole 57 Connection Portion 60 Notch 61 Projection Plate 62 Support Protrusion

Claims

A body attached to the oil supply pipe;
It consists of a flapper that opens and closes the opening of the oiling pipe by attaching it rotatably to the body,
The body is a member formed by integrally forming a fitting portion of the rotating shaft and the bearing, and an elastic body having one end connected to the body and the other end being a free end and pressing the flapper in the closing direction.
The flapper is a member that includes a lid part that opens and closes the opening of the oil supply pipe, and a fitting part of the rotary shaft and the bearing.
By fitting the fitting part on the body side and the fitting part on the flapper side, the flapper is rotatably assembled to the body, and the elastic body presses the flapper in the closing direction when the flapper is rotated in the opening direction. Check valve for fuel supply pipe.
The check valve for a fuel supply pipe according to claim 1, wherein the flapper is a member formed by integrally forming a lid portion and a fitting portion on the flapper side.
3. The fuel supply pipe according to claim 1, wherein a free end of the elastic body is disposed on a rotation locus when the flapper opens in a state where the fitting part on the body side and the fitting part on the flapper side are fitted together. Check valve.
The check valve of the fuel supply pipe according to any one of claims 1 to 3, wherein the free end of the elastic body includes a push projection that presses the flapper.
it can.
The check valve of the fuel supply pipe according to any one of claims 1 to 4, wherein the body and the flapper are made of an oil-resistant fiber-reinforced plastic.
6. The check valve for a fuel supply pipe according to claim 1, wherein the fitting part on the body side is a bearing, and the fitting part on the flapper side is a rotating shaft.
6. The check valve for a fuel supply pipe according to claim 1, wherein the fitting portion on the body side is a rotating shaft, and the fitting portion on the flapper side is a bearing.
The bearing has a notch,
When the rotating shaft is pressed against the notch of the bearing,
The check valve of the fuel supply pipe according to claim 6 or 7, wherein the bearing is elastically deformed so that the rotating shaft is rotatably fitted and returned to its original shape to prevent the rotating shaft from dropping off.
The bearing is annular,
The check valve for a fuel supply pipe according to claim 6 or 7, wherein a support protrusion or a projecting plate connected to a rotating shaft is elastically deformed and the rotating shaft is rotatably fitted to the bearing.