JP2512163Y2 - Check valve for fuel tank - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a valve body in a backflow prevention device for a fuel tank, which is provided between a fuel filling port and a fuel tank of an automobile.

[Prior art]

A backflow prevention device for a fuel tank that has a function of opening at the time of normal flow at the time of refueling and closing at the time of backflow of the fuel is conventionally known, for example, Syokai 59-9926 and 59-155222.
It is found in No. 60-3118. Since the constituent members of these components are independent components such as a valve body, a valve body, and a rotary shaft pin, the number of components is large. Further, after the rotary shaft pin is assembled, it is necessary to crush the tip so that the pin does not come off. SUMMARY OF THE INVENTION The inventors of the present invention have made it an object to simplify the assembly and reduce the number of parts in such a backflow prevention device for a fuel tank, and at the same time, a structure in which the valve body does not easily come off and the assembly does not come off from the pipe. Consider, first, the actual application 1
Proposed as No. 141732. In the case where the fuel tank backflow prevention device is a single-valve element, it was necessary to set the mounting portion so that its direction was restricted in order to function properly. For example, a positioning protrusion is provided on the valve body, and a notch for positioning is made on the mating pipe to determine the direction by combining both. This is because the valve body is always closed by the weight of the valve body so as to speed up the response at the time of reverse flow and to arrange so that the resistance is reduced as much as possible during refueling. Further, when the valve body is closed and tar or foreign matter in the fuel adheres to the bearing to cause a rotation failure, there is a risk that the fuel cannot be supplied. Further, the fuel in the fuel supply pipe is turbulent during refueling, which is one of the causes of deterioration of refueling performance. It is desirable to lead to the tank in laminar flow. Therefore, in Japanese Patent Application No. 2-70076, a ring-shaped inner portion is divided into three or more fan-shaped portions, and a valve body having a supporting rod on the dividing line, and a supporting rod having a shape corresponding to the fan-shaped bearing are rotary bearings. A backflow prevention device for a fuel tank was developed, which is composed of a valve body and a rotation restricting portion that restricts the rotation range of the valve body in one direction to the rotary bearing of the support rod by 90 ° or less. I am proposing. As a result, among the drawbacks of the above-mentioned conventional technology,
The following problems were solved. In other words, it has become possible to eliminate the mounting directionality, reduce the risk of valve body rotation failure, and add a rectifying function as an additional function.

[Problems to be solved by the device]

However, as a result of subsequent studies, there are various types of fuel, and some of them contain a large amount of tar. It has been found that the use of conventional shafts and bearings for such fuels can lead to tar deposits and valve valve failure. In addition, it was pointed out that the structure like Japanese Utility Model Laid-Open No. 59-9926 would be troublesome to assemble. Therefore, in the present invention, in particular, the valve body is examined to suppress the rotation failure due to the adhesion of foreign matter such as tar and to reduce the labor of assembling.

[Means for Solving the Problems]

As a result, the inside of the annular valve body (3) is divided into a plurality of fans, and the support rod (2) on the dividing line is a valve body (1) which serves as a rotary bearing. A plate-shaped valve action part (10) capable of closing a fan shape, and a rotation trajectory regulation part (11) that abuts a rotation regulation part of the support rod (2) on the base side of the valve action part (10), A structure including a shaft portion (12) protruding from the rotation locus restricting portion (11) to the opposite side of the valve action portion (10), and a hook-shaped locking portion (7) at the tip of the shaft portion (12). I did. Here, the shape of the valve action part (10) is 3 inside the annular valve.
It has the same fan-shaped shape that is formed when it is divided into more than five equal parts. The rotation locus restricting portion (11) is for the valve body to rotate in a circle around the bearing (5). The rotation restricting portion (4) restricts the rotation range of the valve element to 90 ° or less.
The rotation angle is determined by adjusting the clearance between the locking portions (6a) and (6b) with respect to the valve plate thickness. Further, the step is provided between the valve action portion and the valve action portion for escape when the adjacent blades are overlapped when closed (see FIG. 9). When the shaft portion (12) is inserted into the bearing (5) provided on the support rod (2), the shaft portion can be deformed and inserted, but if the locking portion is also deformed, it changes. You can increase the amount,
There is a large amount of overlap to prevent it from coming off the bearing,
Moreover, the assembly becomes easy.

[Action]

With such a structure, since there are a plurality of valve action parts (10), even if the mounting angle of the valve body changes, one of the valve bodies is always immersed in the fuel to perform the rectifying action. The turning locus restricting portion (11) acts so that the valve body rotates in a circle centering on the bearing (5). Further, the rotation restricting portion (4) restricts the rotation angle of the valve body acting portion (10).
Furthermore, since a step is provided between the valve body acting portion (10) and the valve body acting portion (10), it is possible to prevent the adjacent blades from overlapping when closed. The shaft portion (12) is deformed and the hook-shaped locking portion (7) at the tip is locked in the elongated hole of the support rod (2). The hook-shaped engaging portion (7) at the tip of the shaft portion (12) is also deformable (Figs. 4 and 5) with or without deformation of the shaft portion (12) (Fig. 4). Even (FIG. 5), the attachment to the supporting rod (2) becomes easier. To work.

【Example】

1 to 6 show the check valve of the fuel tank of the present invention, and FIGS. 7 to 9 show the use state of the check valve. FIG. 1 is a front view of a check valve according to a first embodiment of the present invention, and FIG. 2 is a side view thereof. As shown in these drawings, the check valve of this fuel tank has a fan-shaped valve action portion (10), and is a fan-shaped divided portion inside the annular valve body (3) shown in FIG. Is a plate-like body capable of closing. The edge portion on the base side of the valve action portion (10) serves as a rotation locus restricting portion (11). The rotation trajectory restricting portion (11) contacts the rotation restricting portion (4) of the support rod (2). Two shaft portions (12) project from the rotation locus restricting portion (11) to the opposite side of the valve action portion (10). The tip of the shaft portion (12) is hook-shaped and protrudes in the opposite direction to form a locking portion (7). FIG. 3 is a front view of the second embodiment. In this example, a protrusion is provided at the base of the shaft portion (12) to reduce friction, and the rotation restricting portion (4) reduces the rotation angle of the valve action portion (10).
It acts to regulate in the range of 75 °. Furthermore, the locking part (7)
Since the tips of the are connected, the strength increases. FIG. 4 shows the third embodiment, but since the locking portion (7) is formed in a hook shape deeper than that of FIG. 1, the deformation amount can be made large and the attachment to the supporting rod (2) can be performed. It's easy. In the fourth embodiment of FIG. 5, the shaft portion (12) is a single thick one, and a hook-like locking portion (7) is formed at the tip of the shaft portion (12) on both left and right sides to form only the locking portion (7). It is a type that is attached by deformation. The fifth embodiment of FIG. 6 is a modification in which an inward hook-shaped engaging portion (7) is provided at the tips of the two shaft portions (12), contrary to FIG. FIGS. 7 to 9 show the assembled state and operating state of the check valve of the first embodiment shown in FIGS. In this example, the inside of the annular valve body (3) is divided into three fan-shaped parts (fan angle 120 °), and the supporting rod (2) is provided on the dividing line.
Is provided. Therefore, the supporting rod (2) has a structure branched from the center in three directions. As described above, the valve body (1) has a fan-like shape, and the shaft portion (12) is rotatably held by the bearing (5) provided on the support rod (2). Here, three valve bodies (1a) (1b) (1c)
In order to restrict the rotation range of the bearing so as to be 75 ° or less and in the same direction, the valve body (1) is attached to the rotary bearing (5) of the support rod (2).
The rotation restricting portion (4) is provided. The rotation restricting portion (4) is provided with locking portions (6a) and (6b) at two positions on the circumference of the support rod (2) holding the bearing (5) of the valve body (1), and at the same time, the locking portion (6a). ) (6b) are separated by approximately 180 °, and the cross-sectional shape is a fan shape with a fan angle of 90 °.
Since the part that contacts with is the two sides that sandwich the fan angle, the rotation range of the valve bodies (1a) (1b) (1c) is approximately 90 ° or less. The valve body (1) is provided with a locking portion (7) having a step rearward from the shaft supporting portion, and the locking portion (7) rotates on the opposite side of the valve body (1) to support the rod ( By touching 2), the stopper function is achieved, and the rotation of the valve body (1) is regulated so as to be in the same direction. Further, the valve body (3) is provided with a regulating projection (8), and the tip end portion of the valve body (1) is in contact with the end of the rotation, which also serves as a stopper.

[Effect of device]

The structure of the check valve of the fuel tank of the present invention having the above-described structure has the effect of eliminating the rotation failure of the valve body due to the adherence of foreign matter and reducing the assembling work.

[Brief description of drawings]

FIG. 1 is a front view of the check valve, and FIG. 2 is a side view of the same. 3 to 6 are front views of another embodiment of the check valve. FIG. 7 is a front view when the check valve is assembled to the valve body. FIG. 8 shows AA in FIG.
A sectional view and FIG. 9 are enlarged sectional views taken along the line BB in FIG. (1) Valve body, (2) Support rod (3) Valve body, (4) Rotation restriction part (5) Bearing, (6a) (6b) Locking part (7) Locking part, (8) Restricting protrusion (10) Valve action part, (11) Rotation locus regulation part (12) Shaft part

Claims (1)

(57) [Scope of utility model registration request] 1. A valve body (1) in which the inside of an annular valve body (3) is divided into a plurality of fan shapes, and a supporting rod (2) on the dividing line serves as a rotary bearing. A plate-shaped valve action part (10) capable of closing the fan shape, and a rotation locus regulation part (10) abutting against a rotation regulation part (4) of the support rod (2) on the base side of the valve action part (10). 11), a shaft portion (12) protruding from the rotation locus restricting portion (11) to the opposite side of the valve action portion (10), and a hook-like locking portion (7) at the tip of the shaft portion (12). Check valve for fuel tank consisting of and.