JP2020002968A - Check valve and its attachment mechanism - Google Patents

Abstract

To provide a check valve which is excellent in attachment workability, and suppressed in the occurrence of a turning failure even after the lapse of years, and an attachment mechanism of the check valve.SOLUTION: A valve body 30 (a pair of valve plates 31A, 31B, turning parts 32 of the valve plates, and an energization part 34 straddling both the valve parts, and energizing the valve plates 31A, 31B to a direction in which the valve plates are opened) is integrally formed at a check valve 10. The energization part 34 is attached into a hole part 22 located above from a notch 23 which is formed at a lower part of a side face of a housing 20 in a state of being located above the valve plates 31A, 31B, and the valve plates 31A, 31B are assembled while abutting on a protrusion 24 which is formed in the housing 20. The check valve 10 is inserted into a lower pipe 2 of a fuel tank 1, the lower pipe 2 is covered with a hose 5, a hose clamp 6 is arranged in a position of the hole part 22 of the housing 20, and the hose 5, the lower pipe 2 and the check valve 10 are fastened to one another.SELECTED DRAWING: Figure 5

Description

TECHNICAL FIELD The present invention relates to a check valve and a check valve mounting mechanism which are excellent in workability in assembling and suppress the occurrence of falling off and poor rotation even after aging.

A vehicle using an internal combustion engine as a drive source is equipped with a fuel tank for storing fuel, and a lower pipe is protruded from the fuel tank. A filler pipe is connected to the filler port provided in the vehicle, and a rubber hose is connected between the filler pipe and the lower pipe of the fuel tank, so that fuel can be supplied from the filler port to the fuel tank. . The connection between the hose and the lower pipe is tightened by a metal hose clamp.

And, in order to prevent the fuel vapor in the fuel tank from being released to the atmosphere at the time of refueling and to prevent the backflow of the fuel, a valve body composed of a pair of semi-circular valve plates is rotatably incorporated. It is known that a check valve composed of a housing is inserted into a lower pipe to open and close a fuel flow path. (Patent Document 1 and Patent Document 2)

As shown in FIG. 11, the check valve 10 of Patent Document 1 has a hinge provided on a pair of valve plates 31A and 31B that enables a fuel introduction hole (fuel passage) to be closed in a housing 20 (main body). The portion 350 is swingably mounted in the elongated hinge hole 220 provided in the housing 20, and a compression spring 340 for urging the valve plates 31A, 31B in the closing direction is provided between the valve plates 31A, 31B. It is installed.

  As shown in FIG. 12, the check valve 10 of Patent Document 2 includes a pair of semi-disc-shaped valve plates 31A and 31B, and one of the valve plates 31A has a rotating shaft 320. The other valve plate 31B is provided with a bearing ring 321 and is formed integrally with the housing 20 in a state where these valve plates 31A and 31B are combined. Spring pieces 310 are formed integrally and diagonally outward on the valve plates 31A and 31B so as to face each other. When the valve plates 31A and 31B are combined, the ends of the spring pieces 310 are brought into abutting state. When the fuel is supplied from the upstream side of the valve plate, the spring pieces 310 are displaced as the valve plates 31A and 31B rotate in the opening direction, and the spring pieces 310 are displaced to urge the valve plates 31A and 31B in the closing direction. The spring force is stored.

JP 2005-114062 A JP 2008-115940 A

  According to the structure of Patent Literature 1, the hinge portions 350 provided at both ends of the valve plates 31A and 31B (blade pieces) are replaced with the elongated hinge holes 220 provided in the housing 20 (body portion). , And there was a problem in workability in assembling.

  Further, according to the structure of Patent Document 2, since the housing 20 and the valve plates 31A and 31B are integrally formed, there is no problem in the workability of assembling the check valve 10, but these valve plates 31A and 31B are not problematic. Are integrally formed with the housing 20 in a state in which they are combined, so that the mold becomes complicated. Further, in the structure of Patent Document 2, when the valve plates 31A and 31B are combined, the ends of the spring pieces 310 are brought into abutting state, and when fuel is supplied from the upstream side of the valve plates 31A and 31B, the valve plates 31A and 31B are closed. As the springs 31A and 31B rotate in the opening direction, the spring pieces 310 are displaced, and a spring force for urging the valve plates 31A and 31B in the closing direction is accumulated. Accordingly, there is a problem of malfunction of the check valve 10 due to abrasion of a part where the tips of the spring pieces 310 abut against each other.

In order to solve the above-mentioned problems, the present invention according to claim 1 includes a housing which is incorporated in a pipe through which a fluid can be introduced, and which has a fluid hole penetrating in the axial direction of the pipe therein, A non-return valve having a valve body mounted on and capable of opening and closing a fluid hole, wherein the valve body is formed by combining a pair of valve plates having a substantially semi-disc shape and a valve plate. And a deformable biasing portion that straddles the valve plate and biases the valve plate in the opening direction.The housing is provided at the top as a stopper when inserted into the pipe. A functioning flange portion, a side portion, a hole portion penetrating the side surface and having a diameter slightly larger than the diameter of the turning portion for mounting the turning portion of the valve body, and a housing portion below the hole portion. At the bottom, it is wider than the diameter of the rotating part and narrows upward from the bottom, At the connecting portion with the hole, a notch portion smaller than the diameter of the hole portion, and inside the protrusion at the same height as the hole portion or below the hole portion, which comes into contact with the valve plate of the valve body and closes the fluid hole. The check valve is characterized in that the rotating portion is attached to the hole from the cut portion of the housing with the biasing portion of the valve body positioned above the valve plate.

  According to the first aspect of the present invention, a substantially semi-disc-shaped valve plate and a pair of valve plates are formed in combination, and a rotating portion that enables the valve plate to rotate is formed across the valve body. In the state where the biasing portion is located above the valve plate, the diameter of the rotating portion is wider at the lowermost portion of the housing and narrows upward from the lowermost portion, and the diameter of the connecting portion with the hole is smaller than the diameter of the hole. Since the valve body is attached to the hole from the notch portion that becomes smaller, workability of assembling the valve body to the housing is improved.

  In addition, since a deformable urging portion for urging the valve plate in the opening direction is provided, both valve plates abut against the protrusion of the housing, and the fluid hole of the housing can be reliably closed. Furthermore, since the upper part of the hole of the housing, that is, the upstream side of the fluid flow path is not open, even if dust from the oil filler port enters at the time of refueling or the like, the dust does not enter the hole, and the valve body after aging. Can be smoothly rotated.

  According to a second aspect of the present invention, a through hole that penetrates the rotating portion is provided at the center of the cross section of the rotating portion of the valve body, and the rotating portion of the valve body is formed by abutting a pair of valve plates. This is a check valve in which a pin having a columnar section is inserted into a through hole to enable rotation of a valve body. According to the second aspect of the present invention, a through-hole penetrating the rotating portion is provided at the center of the cross section of the rotating portion of the valve body, and the rotating portion of the valve body formed by abutting a pair of valve plates is provided. Since a pin with a cylindrical cross section is inserted into the through hole, one pin penetrates the rotating part that enables rotation by combining the valve body, and the movement of the rotating part and the valve body is smooth. can do. Further, the workability of assembling the valve body to the housing is further improved.

  According to a third aspect of the present invention, the housing, the valve plate, the rotating portion, and the biasing portion are made of resin, and the valve plate, the rotating portion, and the biasing portion are check valves that are simultaneously molded. According to the third aspect of the present invention, since the housing, the valve plate, the rotating portion, and the urging portion are made of resin, the weight of the check valve can be reduced. Further, since the valve plate, the rotating portion, and the biasing portion are formed at the same time, the pair of valve plates does not fall apart, and the workability of subsequent mounting to the housing is improved.

  The invention according to claim 4 is a lower pipe protruding from the fuel tank, a check valve mounted on the lower pipe, a filler pipe connected to a fuel supply port provided in the vehicle, a filler pipe and a lower pipe of the fuel tank. A check valve mounting mechanism having a hose connecting between the hoses, the hose, a lower pipe and a check valve being tightened by a hose clamp, wherein the check valve is provided with a fluid hole penetrating therein in the axial direction of the lower pipe. And a valve body mounted in the fluid hole of the housing to open and close the fluid hole, and the valve body is formed by combining a pair of valve plates having a substantially semi-disc shape and a valve plate. A rotating portion that enables the rotation of the valve plate, and a deformable biasing portion that straddles the valve plate and biases the valve body in the opening direction. A collar that functions as a stopper A hole having a diameter slightly larger than the diameter of the rotating portion for mounting the rotating portion of the valve body, and a rotating portion at the bottom of the housing below the hole; Notch, which is wider than the diameter of the hole and narrows upward from the lowermost portion, and becomes smaller than the diameter of the hole at the connection with the hole, and inside, at the same height as the hole or below the hole, A projection that abuts against the valve plate of the valve body to close the fluid hole, and the rotating portion is attached to the hole from the cut portion of the housing with the biasing portion of the valve body positioned above the valve plate. A check valve is attached to the lower pipe, a hose is put on the lower pipe, and a hose clamp is placed on the hose corresponding to the hole of the housing of the check valve to tighten the hose, the lower pipe and the check valve. And a check valve mounting mechanism.

  According to the fourth aspect of the present invention, by providing the above mechanism, the hose clamp is disposed on the hose corresponding to the position of the hole of the housing of the check valve, and the hose, the lower pipe and the check valve are tightened. In the portion, the hole and the cut portion below the hole are narrowed by the tightening force from the hose clamp.

As a result, even when the rotating portion of the valve body of the check valve is mounted in the hole from the cut portion at the lower portion of the housing, the valve body can be prevented from dropping from the housing. Further, in consideration of the action of narrowing the hole of the tightening force from the hose clamp and the notch below the hole, the width of the portion connected to the hole of the notch can be designed to be slightly wider. In addition, attachment of the valve body to the hole of the housing is further facilitated, and workability is further improved.

  The present invention according to claim 5 is a mounting mechanism for a lower pipe protruding from a fuel tank and a check valve for inserting and checking a check valve in the lower pipe, wherein the check valve is provided in the axial direction of the lower pipe. A housing provided with a fluid hole therethrough, and a valve body mounted in the fluid hole of the housing and capable of opening and closing the fluid hole, wherein the valve body has a pair of substantially semi-disc-shaped valve plates; A rotating portion that enables rotation of a valve plate formed by combining the plates, and a deformable biasing portion that straddles the valve plate and biases in a direction to open the valve body, and the housing has an upper portion A flange that functions as a stopper when inserted into the lower pipe, and a hole that penetrates the side surface and has a diameter slightly larger than the diameter of the rotating portion for mounting the rotating portion of the valve body on the side surface, Below the hole, the lowermost part of the housing is wider than the diameter of the rotating part and the lowermost part. From the upper part, the notch part which is smaller than the diameter of the hole part at the connection part with the hole part, and the inside, at the same height as the hole part or below the hole part, comes into contact with the valve plate of the valve body. A protrusion that closes the fluid hole, with the urging portion of the valve body positioned above the valve plate, and the rotating portion mounted to the hole from the cut portion of the housing, and the inner surface of the lower pipe or the non-return The check valve is characterized in that a cut-out or / and a hole of the check valve housing are narrowed when the check valve is mounted on the lower pipe. Mechanism.

  According to the fifth aspect of the present invention, at the stage where the check valve is attached to the lower pipe, the cut portion or / and the hole of the check valve are narrowed. The valve body can be prevented from dropping out of the housing even when the valve body is attached to the hole from the cutout at the bottom of the housing. Further, in consideration of the fact that the hole and the notch at the lower part of the hole become narrower, the width of the connecting portion between the hole and the notch can be designed to be slightly wider, so that the valve element to the hole of the housing is provided. Is easier to install, and workability is further improved.

  According to a sixth aspect of the present invention, the notch or / and the hole of the check valve housing is narrowed with respect to the inner diameter of the lower pipe, and when the check valve insertion into the lower pipe is completed, the check valve housing is closed. A check valve mounting mechanism having an inner diameter narrowing portion which is smaller than a portion of the lower pipe where the flange portion of the check valve housing abuts at the same position as the hole portion or below the hole portion.

According to the sixth aspect of the present invention, regarding the inner diameter of the lower pipe, when the check valve insertion into the lower pipe is completed, the check valve in the lower pipe is located at the same position as the hole of the housing of the check valve or at a position below the hole. Since the valve housing has an inner diameter constricted portion that is smaller than the portion where the flange portion of the valve comes into contact with, a notch or / and a hole of the housing of the check valve as the check valve is inserted into the lower pipe. Is deformed to be narrow.

Therefore, it is possible to prevent the valve body from falling off the housing. Further, in consideration of the fact that the hole and the notch at the lower part of the hole become narrower, the width of the connecting portion between the hole and the notch can be designed to be slightly wider, so that the valve element to the hole of the housing is provided. Is easier to install, and workability is further improved.

  The present invention according to claim 7 relates to the inner diameter of the lower pipe, wherein the inner diameter narrowing portion is a projection projecting from the inner surface of the lower pipe toward the housing of the check valve, and is located at the same position as the hole of the housing of the check valve or the same. This is a check valve mounting mechanism provided at a position below the hole.

  According to the seventh aspect of the present invention, a protrusion is formed on the inner surface of the lower pipe at the same position as the hole of the check valve housing or at a position below the hole, and protrudes from the inner surface of the lower pipe toward the housing of the check valve. Therefore, when the check valve is inserted into the lower pipe, the cut portion and / or the hole of the housing of the check valve is deformed so as to be narrowed by the protrusion.

  Therefore, it is possible to prevent the valve body from falling off the housing. Also, in consideration of the narrowing of the hole and the cut portion at the lower portion of the hole, the width of the connecting portion between the hole and the cut portion can be designed to be slightly wider, so that the valve element to the hole of the housing is provided. Is easier to install, and workability is further improved.

  The present invention according to claim 8 is that the notch or / and the hole of the check valve housing is narrowed in relation to the outer diameter of the check valve housing, and the protrusion provided inside the check valve housing. This is a check valve mounting mechanism having an outer diameter extension at a position lower than the inner diameter of a portion of the lower pipe where the flange of the housing of the check valve abuts.

According to the eighth aspect of the present invention, the process of narrowing the notch portion and / or the hole portion of the check valve housing relates to the outer diameter of the check valve housing, and the protrusion provided inside the check valve housing. Since the lower pipe has an expanded portion that is larger than the inner diameter of the portion where the flange of the housing of the check valve abuts in the lower pipe, the check valve is inserted into the lower pipe so that the check valve is not checked. The notch or / and hole of the valve housing is deformed to be narrow.

Therefore, it is possible to prevent the valve body from falling off the housing. Further, in consideration of the fact that the hole and the notch at the lower part of the hole become narrower, the width of the connecting portion between the hole and the notch can be designed to be slightly wider, so that the valve element to the hole of the housing is provided. Is easier to install, and workability is further improved.

  The present invention according to claim 9 relates to the outer diameter of the check valve housing, wherein the extended portion is a protrusion protruding toward the inner surface of the lower pipe, and is lower than the protrusion provided inside the check valve housing. Is a mounting mechanism of the check valve provided at the position of (1).

  According to the ninth aspect of the present invention, since the protrusion protrudes toward the inner surface of the lower pipe and is provided at a position below the protrusion provided inside the housing of the check valve, the check valve is provided on the lower pipe. As the protrusion is inserted, the protrusion is deformed so that the notch or / and hole of the housing of the check valve becomes narrower.

  Therefore, it is possible to prevent the valve body from falling off the housing. Further, in consideration of the fact that the hole and the notch at the lower part of the hole become narrower, the width of the connecting portion between the hole and the notch can be designed to be slightly wider, so that the valve element to the hole of the housing is provided. Is easier to install, and workability is further improved.

  According to the present invention, a valve plate having a substantially semi-disc shape and a pair of valve plates are combined with each other, and a rotating portion that allows the valve plate to rotate is formed so as to straddle the pair of valve plates. Since the urging portion is mounted on the hole from the cutout portion of the housing in a state where the urging portion is located above the valve plate, an operation of attaching the valve body (a pair of semi-disc-shaped valve plates, a rotating portion, and an urging portion) to the housing. The performance is improved.

In addition, since the hose clamp is arranged on the hose corresponding to the position of the hole of the housing of the check valve and tightens the hose, the lower pipe and the check valve, the rotating portion of the valve element of the check valve is cut into the notch at the bottom of the housing. Even in a case where the valve body is mounted in the hole from above, it is possible to suppress the valve body from falling out of the housing and the occurrence of poor rotation.

  Further, since the cut portion or / and the hole of the check valve are narrowed on the inner surface of the lower pipe or the outer side surface of the housing of the check valve, the rotating portion of the valve body of the check valve is formed. Even in the case where the valve body is attached to the hole from the notch in the lower portion of the housing, it is possible to suppress the valve body from falling off the housing and the occurrence of poor rotation.

FIG. 2 is a cross-sectional view of a lower pipe of a fuel tank showing an arrangement of a check valve according to the first embodiment of the present invention. FIG. 1 is a sectional view of a check valve according to a first embodiment of the present invention. FIG. 4A shows a valve plate of a first embodiment of the present invention after a valve plate, a rotating portion, and a biasing portion are formed, (a) is a perspective view, (b) is a top view, and (c) is a side view. is there. FIG. 2A is a top view and FIG. 2B is a side view of the valve body according to the first embodiment of the present invention after assembling a valve plate, a rotating portion, and an urging portion. FIG. 2 is a cross-sectional view showing a state in which the check valve according to the first embodiment of the present invention is mounted on a lower pipe of a fuel tank and is tightened with a hose clamp from above a hose. It is a figure which shows the relationship between the lower pipe which shows 2nd Embodiment of this invention, and the housing of a check valve, The housing of a check valve is a side view, and a lower pipe is sectional drawing. It is a figure which shows the relationship between the lower pipe and the housing of the check valve which show 3rd Embodiment of this invention, the housing of a check valve is a side view, and a lower pipe is sectional drawing. It is sectional drawing in the state which attached the non-return valve which shows 3rd Embodiment of this invention to the lower pipe of the fuel tank, and welded the filler pipe and the fuel tank. FIG. 8 is a diagram showing a relationship between a check valve housing and a lower pipe according to a fourth embodiment of the present invention, wherein the check valve housing is a side view and the lower pipe is a sectional view. FIG. 13 is a diagram illustrating a relationship between a check valve housing and a lower pipe according to a fifth embodiment of the present invention. The check valve housing is a side view, and the lower pipe is a cross-sectional view. It is sectional drawing of the conventional non-return valve (patent document 1). It is sectional drawing of the conventional non-return valve (patent document 2).

  A first embodiment of the present invention will be described with reference to FIGS. The same parts as those in the conventional example are denoted by the same reference numerals. In FIG. 1, a lower pipe 2 is projected from an upper portion of a fuel tank 1 of an automobile, while a filler pipe 4 is attached so as to communicate with a filler port 3 of an automobile body. Are connected by a rubber hose 5. The connection between the hose 5 and the lower pipe 2 is tightened by a metal hose clamp 6.

Inside the lower pipe 2 protruding from the fuel tank 1, a check valve 10 is incorporated at the end of the lower pipe 2, and the metal hose clamp 6 is connected to the hole 22 of the housing 20 of the check valve 10. The hose 5, the lower pipe 2 and the check valve 10 are tightened by being arranged on the hose 5 corresponding to the position. The check valve 10 will be described in detail below.

(Check valve 10)
As shown in FIGS. 2 to 4, the check valve 10 includes a pair of semi-disc-shaped valve plates 31A and 31B, and a through hole 33 of a rotating portion 32 in a combination portion of the valve plates 31A and 31B. The pins 35 made of stainless steel are inserted so that the valve plates 31A and 31B can be turned.

Further, a deformable biasing portion 34 is provided to straddle the pair of semi-circular valve plates 31A and 31B and bias the valve plates 31A and 31B in the opening direction. Then, the valve body 30 in which the pair of semi-circular valve plates 31A and 31B, the rotating portion 32 and the biasing portion 34 are integrated is mounted on the housing with the biasing portion 34 being on the valve plates 31A and 31B. The housing 20 is inserted into the notch 23 and mounted in the hole 22 of the housing 20 to be assembled.

  By the way, the housing 20 and the valve body 30 (the pair of valve plates 31A and 31B, the rotating part 32 and the urging part 34) constituting the check valve 10 in the present embodiment are formed of high-density PE (polyethylene). I have. Note that other resins such as EVOH (ethylene / vinyl alcohol copolymer) may be used as long as they satisfy oil resistance.

  In the present embodiment, the housing 20 is cylindrical, has an inner diameter of 25 mm, and a thickness of 1.5 mm. The inside of the housing 20 is a fluid hole 25 that is a fuel flow path. A flange 21 serving as a stopper when the housing 20 is inserted into the lower pipe 2 is formed on an upper portion of the housing 20. The thickness of the flange portion 21 is 1.5 mm, and is formed so as to protrude 1.5 mm from the housing 20 to the outside. The length from the upper part to the lowermost part of the flange 21 of the housing 20 is 50 mm.

A hole 22 that penetrates the side surface of the housing 20 is formed in the side surface of the housing 20 at a position 25 mm from the lowermost part, that is, at the center of the housing 20 in the longitudinal direction. The diameter of the hole 22 is 5 mm.

Below the hole 22 of the housing 20, a cut portion 23 is formed in which a lower portion of the hole 22 is opened with a width t and spreads downward at an angle α. In the present embodiment, t is 3.0 mm and α is 20 °. Also, the lowermost part of the cutout 23 is chamfered.

  On the other hand, at the same height as the hole 22 of the housing 20 in the fluid hole 25 which is the fuel flow path inside the housing 20, a protrusion A24 is provided in which the valve plates 31A and 31B opened by the urging portion 34 abut. Have been. The protrusion A <b> 24 has a hemispherical cross section having a diameter of 2 mm, and is provided all around the inside of the housing 20 except for the hole 22.

As shown in FIG. 3, the valve body 30 (a pair of semi-disc-shaped valve plates 31A and 31B, a rotating portion 32, and an urging portion 34) is integrally formed. The rotating part 32 of the valve plates 31A and 31B is configured such that one of the valve plates 31A is formed in a convex shape in the center, the other valve plate 31B is formed in a concave shape in the center, and the convex center of the valve plate 31A is formed. The part is designed to fit into the concave part of the valve plate 31B. A through hole 33 is formed in the center of the cross section of the rotating portion 32. When the valve plates 31A and 31B are combined, the rotating portion 32 is on a straight line, a metal pin 35 is passed through the through hole 33 of the rotating portion 32, and the valve plates 31A and 31B are rotatable. .

In the present embodiment, the thickness of the valve plates 31A and 31B is 1 mm, the combination of the pair of valve plates 31A and 31B results in a circular shape, and the diameter is 22 mm. Further, the outer diameter of the rotating part 32 is 4 mm, and the diameter of the through hole 33 is 2 mm. The thickness of the urging portion 34 is 1 mm.

  The valve body 30 (a pair of semi-disc-shaped valve plates 31A and 31B, a rotating portion 32 and an urging portion 34) is formed so that the valve plates 31A and 31B face slightly upward. , Are formed in such a shape that the arc undulates at the center. However, as shown in FIG. 4, the turning portions 32 of the pair of valve plates 31A and 31B are combined, the turning portions 32 are arranged in a straight line, and a stainless steel pin 35 is inserted into the through hole 33 of the turning portion 32. In a state where the pair of valve plates 31A and 31B are integrated to make the rotating portion 32 rotatable, the valve plates 31A and 31B are substantially horizontal, and the urging portion 34 has an arc shape.

  As shown in FIG. 2, the valve body 30 (the pair of semi-disc-shaped valve plates 31A and 31B, the rotating unit 32 and the urging unit 34) is placed in a state where the urging unit 34 is above the valve plates 31A and 31B. When inserted into the cutout 23 of the housing 20 and mounted in the hole 22 of the housing 20, the valve plates 31A and 31B abut slightly against the projection A24 of the housing 20. At this time, the urging portion 34 applies an upward force to the valve plates 31A and 31B to push the protrusion A24 of the housing 20 from below. This state is called that the valve body 30 is closed.

As shown in FIG. 5, the check valve 10 is inserted into a lower pipe 2 provided in the fuel tank 1. At this time, the flange 21 formed on the upper part of the housing 20 functions as a stopper, and the check valve 10 is temporarily fixed on the upper part of the lower pipe 2.

The lower pipe 2 is covered with a rubber hose 5 for connecting the lower pipe 2 and the filler pipe 4 (see FIG. 1), and the hose clamp 6 is arranged on the hose 5 corresponding to the position of the hole 22 of the housing 20 of the check valve 10. Then, the hose 5, the lower pipe 2, and the check valve 10 are tightened by tightening the hose clamp 6.

  As a result, in the hole portion 22 of the housing 20, the tightening force from the hose clamp 6 narrows the hole portion 22 and the cutout portion 23 below the hole portion 22. The portion 32 can be prevented from dropping from the housing 20.

  Normally, the valve body 30 of the check valve 10 is closed, but when fuel is supplied, the fuel pushes the valve plates 31A and 31B downward, and the valve plates 31A and 31B separate from the protrusion A24 of the housing 20 (the valve body 30). Is opened), the fuel is supplied to the fuel tank 1, but when the fuel supply ends, the valve body 30 of the check valve 10 closes again. As a result, by opening and closing the valve body 30 of the check valve 10, it is possible to prevent the fuel vapor in the fuel tank 1 from being released to the atmosphere at the time of refueling, and to prevent the fuel from flowing backward.

  Further, since the upper part of the hole 22 of the housing 20 is not opened, even if dust from the oil supply port 3 enters at the time of refueling or the like, the dust does not enter the hole 22. Can also be performed smoothly.

  The relationship between the diameter of the hole 22 of the housing 20, the outer diameter of the rotating portion 32 of the valve body 30, and the width t of the lower portion of the hole 22 of the notch 23 of the housing 20 indicates that the rotating portion 32 smoothly moves. In addition, it is necessary to design the rotating portion 32 in consideration of ease of assembling the housing 20 to the hole portion 22 and prevention of falling off after the assembling.

Regarding the outer diameter of the rotating portion 32 of the valve body 30 with respect to the diameter of the hole 22 of the housing 20, the value obtained by dividing the outer diameter of the rotating portion 32 of the valve body 30 by the diameter of the hole 22 of the housing 20 is 0.1. It is desirable to be about 8. This is because the rotation part 32 can maintain smooth rotation without greatly vibrating up and down in the hole part 22 of the housing 20.

Further, the width t of the lower part of the hole 22 is desirably 0.6 times or more and 0.8 times or less with respect to the outer diameter of the rotating portion 32 of the valve body 30. If it is less than 0.6 times, it becomes difficult to assemble the rotating part 32 into the hole 22 of the housing 20. If it exceeds 0.8 times, the hose 5 hits the position of the hole 22 of the housing 20 of the check valve 10. This is because, even when the hose clamp 6 is arranged on the upper side and the hose clamp 6 is tightened, there is a possibility that the valve body 30 may fall off from the check valve 10 after the assembly.

  A second embodiment of the present invention will be described with reference to FIG. The check valve 10 used in the second embodiment is the same as that used in the first embodiment. In FIG. 6, the lower pipe 2 has an inner diameter narrowing portion 7 whose inner diameter decreases in a direction toward the inside of the fuel tank 1. The inner diameter of the inner diameter narrowing portion 7 is smaller by about 1 mm to 2 mm than the inner diameter of the portion of the check valve 10 where the check valve 10 is inserted and the flange 21 of the housing 20 abuts. In this embodiment of the inner diameter narrowing portion 7, the inner diameter narrowing portion 7 is located at a position corresponding to the position of the protrusion A24 provided inside the housing 20 of the check valve 10 when the check valve 10 is mounted on the lower pipe 2. It is provided inside the fuel tank 1. The broken line indicates the inner diameter of the lower pipe 2 used in the first embodiment.

  As is clear from FIG. 6, the lower pipe 2 has the inner diameter narrowing portion 7 whose inner diameter decreases in the direction toward the inside of the fuel tank 1. Therefore, when the check valve 10 is attached to the lower pipe 2 of the fuel tank 1, In the housing 20 of the check valve 10, the cut 23 is deformed by the narrowed inner diameter portion 7 of the lower pipe 2, and the hole 22 and the cut 23 below the hole 22 are narrowed. As a result, it is possible to prevent the rotating portion 32 of the valve body 30 from dropping off the housing 20 even during aging.

A third embodiment of the present invention will be described with reference to FIGS. The check valve 10 used in the third embodiment is the same as that used in the first embodiment. In the present embodiment, on the inner surface of the lower pipe 2, at the same position as the hole 22 of the housing 20 of the check valve 10 or at a position below the hole 22, from the inner surface of the lower pipe 2 toward the housing 20 of the check valve 10. A protruding portion B8 is formed, and the protruding portion B8 corresponds to the inner diameter narrowing portion 7 of the second embodiment. The protrusion B8 is a hemisphere having a diameter of 1 mm to 2 mm.

FIG. 8 is a cross-sectional view in a state where the check valve 10 is mounted on the lower pipe 2 of the fuel tank 1 and the filler pipe 4 and the fuel tank 1 are welded at the welding portion 9. As is apparent from FIG. 8, when the check valve 10 is mounted on the lower pipe 2 of the fuel tank 1, the protrusion 22 provided inside the lower pipe 2 causes the hole 22 and the notch 23 below the hole 22. Becomes narrower. As a result, it is possible to prevent the rotating portion 32 of the valve body 30 from dropping off the housing 20 even during aging. Further, since the filler pipe 4 and the fuel tank 1 are welded at the welding portion 9, the hose 5 and the hose clamp 6 used in the first embodiment can be omitted.

The broken line indicates the state without the protrusion B8, that is, the position of the housing 20 of the check valve 10 in the first embodiment. By the way, in this embodiment, unlike the first embodiment, the filler pipe 4 and the fuel tank 1 are welded. However, similarly to the first embodiment, the hose 5 may be put on the lower pipe 2 and fastened with the hose clamp 6. In that case, the position of the hose clamp 6 is arbitrary.

  A fourth embodiment of the present invention will be described with reference to FIG. Regarding the check valve 10 used in the fourth embodiment, the valve body 30 is the same as that in the first embodiment, but the outer diameter of the housing 20 is changed from the hole 22 of the housing 20 of the check valve 30 to the cut portion 23. Between the lowermost portion, the lower pipe 2 has an outer diameter expansion portion 26 which is larger than the inner diameter of a portion of the check valve 10 where the flange portion 21 of the housing 20 abuts. The outer diameter of the outer diameter expansion portion 26 is larger by about 1 mm to 2 mm than the inner diameter of the portion of the check valve 10 where the check valve 10 is inserted and the flange 21 of the housing 20 abuts. The inner diameter of the lowermost portion of the housing 20 is the same as or slightly smaller than the inner diameter of the portion of the lower pipe 2 where the flange 21 of the housing 20 of the check valve 10 abuts.

  The broken line indicates the housing 20 in the check valve 10 according to the first embodiment. As is apparent from FIG. 9, as the check valve 10 is inserted into the lower pipe 2, the cut portion 23 and / or the hole 22 of the housing 20 of the check valve 10 are deformed so as to become narrow. Therefore, it is possible to prevent the valve body 30 from dropping from the housing 20.

  A fifth embodiment of the present invention will be described with reference to FIG. In the check valve 10 used in the fifth embodiment, the valve body 30 is the same as that in the first embodiment, but a protrusion C27 protruding toward the inner surface of the lower pipe is provided outside the housing 20 of the check valve 10. Is provided. The protrusion C27 has a hemispherical shape with a diameter of 1 mm to 2 mm. As is apparent from FIG. 10, as the check valve 10 is inserted into the lower pipe 2, the cut portion 23 and / or the hole 22 of the housing 20 of the check valve 10 are deformed so as to become narrow. Therefore, it is possible to prevent the valve body 30 from dropping from the housing 20.

The implementation of the present invention is not limited to the above embodiment, and various changes can be made without departing from the purpose of the present invention.

In the first embodiment, the hose clamp 6 is formed by one metal plate, but may be formed by two ring-shaped wire-shaped clamps. In this case, the two ring-shaped wire-shaped clamps are located at the positions of the holes 22 of the housing 20 of the check valve 10 at the time of tightening.

  The projection A, the projection B, and the projection C are all hemispherical, but are not limited thereto. For example, the protruding portion A may have a shape having a straight section in cross section that comes into contact with the valve plate 31A and the valve plate 31B in surface and does not contact the urging portion 34. Further, the protrusion B and the protrusion C may be a part of an arc having a large diameter. What is necessary is that it protrudes 1 mm.

DESCRIPTION OF SYMBOLS 1 Fuel tank 2 Lower pipe 3 Filling port 4 Filler pipe 5 Hose 6 Hose clamp 7 Inner diameter narrowing part 8 Projection B
9 Welding part 10 Check valve 20 Housing 21 Flange part 22 Hole part 23 Cut part 24 Projection A
25 fluid hole 26 outer diameter expansion part 27 protrusion C
30 valve body 31A valve plate 31B valve plate 32 rotating portion 33 through hole 34 biasing portion 35 pin

Claims (9)

A housing that is incorporated into a pipe through which a fluid can be introduced, and that has a fluid hole therein that penetrates in the axial direction of the pipe,
A valve mounted in the fluid hole of the housing and capable of opening and closing the fluid hole,
The valve body is a pair of valve plates having a substantially semi-disc shape,
A rotating portion that allows the valve plate to rotate formed by combining the valve plates;
Comprising a deformable biasing portion that straddles the valve plate and biases the valve plate in the opening direction,
The housing is
On the upper part, a flange portion that functions as a stopper when inserted into the pipe,
A hole having a diameter slightly larger than a diameter of the rotating portion for mounting the rotating portion of the valve body, penetrating the side surface,
Below the hole, a notch that is wider than the diameter of the rotating part at the bottom of the housing and narrows upward from the bottom, and becomes smaller than the diameter of the hole at the connection with the hole. Department and
Inside, at the same height as the hole or below the hole, a projection that closes the fluid hole by contacting the valve plate of the valve body,
A non-return valve, wherein the rotating portion is attached to the hole from the cut portion of the housing in a state where the urging portion of the valve body is positioned above the valve plate.   A through-hole penetrating the rotating portion is provided at a center of a cross section of the rotating portion of the valve body, and the through portion of the rotating portion of the valve body formed by abutting a pair of the valve plates. The check valve according to claim 1, wherein a pin having a columnar cross section is inserted into the hole to enable the rotation of the valve body.   The said housing, the said valve plate, the said rotating part, and the said urging | biasing part are made of resin, The said valve plate, the said rotating part, and the said urging | biasing part are simultaneously molded. Check valve as described. A lower pipe protruding from the fuel tank, a check valve mounted on the lower pipe, a filler pipe connected to a fuel supply port provided in the vehicle, and connecting between the filler pipe and the lower pipe of the fuel tank; A hose having a check valve mounting mechanism for tightening the hose, the lower pipe and the check valve by a hose clamp,
A housing provided with a fluid hole that penetrates the lower pipe in an axial direction of the lower pipe,
A valve body mounted in the fluid hole of the housing to open and close the fluid hole,
The valve body is a pair of valve plates having a substantially semi-disc shape,
A rotating portion that allows the valve plate to rotate formed by combining the valve plates;
Comprising a deformable biasing portion that straddles the valve plate and biases the valve body in the opening direction,
The housing is
On the upper part, a flange portion that functions as a stopper when inserted into the lower pipe,
A hole having a diameter slightly larger than a diameter of the rotating portion for mounting the rotating portion of the valve body, penetrating the side surface,
Below the hole, a notch that is wider than the diameter of the rotating part at the bottom of the housing and narrows upward from the bottom, and becomes smaller than the diameter of the hole at the connection with the hole. Department and
Inside, at the same height as the hole or below the hole, a projection that closes the fluid hole by contacting the valve plate of the valve body,
In a state where the urging portion of the valve body is located above the valve plate, the rotating portion is mounted to the hole from the cut portion of the housing,
The check valve is mounted on the lower pipe, and the lower pipe is covered with the hose,
A check valve mounting mechanism for arranging the hose clamp on the hose corresponding to the position of the hole of the housing of the check valve to tighten the hose, the lower pipe and the check valve; A lower pipe protruding from a fuel tank, and a check valve mounting mechanism for inserting and mounting a check valve into the lower pipe,
A housing provided with a fluid hole that penetrates the lower pipe in an axial direction of the lower pipe,
A valve body mounted in the fluid hole of the housing to open and close the fluid hole,
The valve body is a pair of valve plates having a substantially semi-disc shape,
A rotating portion that allows the valve plate to rotate formed by combining the valve plates;
Comprising a deformable biasing portion that straddles the valve plate and biases the valve body in the opening direction,
The housing is
On the upper part, a flange portion that functions as a stopper when inserted into the lower pipe,
A hole having a diameter slightly larger than a diameter of the rotating portion for mounting the rotating portion of the valve body, penetrating the side surface,
Below the hole, a notch that is wider than the diameter of the rotating part at the bottom of the housing and narrows upward from the bottom, and becomes smaller than the diameter of the hole at the connection with the hole. Department and
Inside, at the same height as the hole or below the hole, a projection that closes the fluid hole by contacting the valve plate of the valve body,
In a state where the urging portion of the valve body is located above the valve plate, the rotating portion is attached to the hole from the cut portion of the housing,
When the check valve is mounted on the lower pipe, the cut portion or / and the hole of the housing of the check valve are narrow on the inner surface of the lower pipe or / and the housing of the check valve. A check valve mounting mechanism characterized by being subjected to the following processing.   The process of narrowing the notch or / and the hole of the housing of the check valve is related to the inner diameter of the lower pipe, and when the check valve is inserted into the lower pipe, the check valve is turned off. 6. An inner diameter narrowing portion which is smaller than a portion of the lower pipe in which the flange of the housing abuts at the same position as the hole of the housing or below the hole. 7. 2. The check valve mounting mechanism according to 1. Regarding the inner diameter of the lower pipe, the inner diameter constricted portion is a projection projecting from the inner surface of the lower pipe toward the housing of the check valve, and the same position or the same as the hole of the housing of the check valve. The check valve mounting mechanism according to claim 6, wherein the check valve is provided at a position below the hole.   The process of narrowing the notch portion and / or the hole portion of the housing of the check valve relates to an outer diameter of the housing of the check valve, wherein the protrusion provided inside the housing of the check valve is provided. The check valve mounting according to claim 5, further comprising, at a position below the portion, an outer diameter extension portion that is larger than an inner diameter of a portion of the lower pipe where the flange portion of the housing of the check valve abuts. mechanism. Concerning the outer diameter of the housing of the check valve, the outer diameter expansion portion is a protrusion protruding toward the inner surface of the lower pipe, and is located below the protrusion provided inside the housing of the check valve. The check valve mounting mechanism according to claim 8, which is provided at a position.

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