JP2001263514A - Flap valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate fitting works of a flap valve. SOLUTION: An insertion part to be inserted in a filler pipe is provided in a hinge bracket 4 to be assembled in a bracket fitting hole provided in a filler pipe 2, a holder hole 4g facing to a pipe opening face 2b is provided in the insertion part, the holder is inserted in the holder hole by inserted in the axial direction of the pipe, and the hinge bracket is assembled in the filler pipe in such a state as prevented from being pulled out with the holder set into a bolt state. The holder can be thus assembled into the holder hole provided in the insertion part in the pipe of the bracket by a simple operation just inserting the holder in the axial direction of the pipe and the fitting performance of the flap valve can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flap valve for opening and closing a pipe line of a pipe.

[0002]

2. Description of the Related Art Conventionally, for example, a filler pipe connected to a fuel tank for an automobile is provided with a flap valve for opening and closing an opening surface of an end of the pipe which is inserted into the tank. The flap valve opens the pipe opening surface during refueling, and shields the pipe opening surface so that fuel in the tank does not flow back into the pipe except during refueling.

FIG. 6 shows a conventional example of a structure in which the flap valve is attached to a filler pipe. In the figure, a lower end of a filler pipe 12 for refueling is connected to a fuel tank 11 attached to a lower part of a floor (not shown) of an automobile. The pipe end at the lower end of the filler pipe 12 penetrates through the side wall of the fuel tank 11 and protrudes into the inside thereof. A portion of the filler pipe 12 received in the fuel tank 11 has an opening surface at the pipe end. A flap valve 13 that opens and closes is provided.

[0004] The flap valve 13 has a disc-shaped valve body 13a so as to cover the pipe opening surface, and a hinge portion extending from an upper portion of the valve body 13a in the drawing in a direction perpendicular to the main surface of the valve body 13a. 13b is formed so as to form an L-shaped cross-sectional shape integrally having the same. A hinge bracket 14 that supports a pivot provided on a hinge portion 13b of the flap valve 13 is attached to an upper portion of a pipe end of the filler pipe 12 in the fuel tank 11. The flap valve 13 is normally urged in a valve closing direction (arrow F in the figure) by a torsion coil spring provided between the flap valve 13 and the hinge bracket 14. At the time of refueling, the flap valve 13
Opens.

[0005]

The above-mentioned flap valve 1
FIG. 7 shows a third conventional mounting structure. In FIG.
Near the pipe opening surface of the filler pipe 12, there is provided a bracket mounting hole 12a through which a pair of leg pieces 14a of the hinge bracket 14 can be inserted as shown by an arrow G in the figure. When the hinge bracket 14 is inserted into the bracket 12a, the side projection 14b on the side surface of the hinge bracket 14 comes into contact with the edge of the bracket assembly hole 12a, so that the hinge bracket 14 is positioned in the insertion direction. Further, after inserting the arc-shaped holder 15 into the filler pipe 12 as shown by the arrow H, it is positioned so as to face the leg piece 14a in the pipe, and the holder 15 is displaced as shown by the arrow I. And the leg piece 1 is inserted into the slot 15a formed in the holder 15.
The hinge bracket 14 and the holder 1 are inserted so that the hooks 4a can be inserted through and the claws formed at the protruding ends of the leg pieces 14a are resiliently engaged with the edges of the slots 15a as shown in FIG.
5 sandwiches the pipe wall of the filler pipe 12. In this manner, the hinge bracket 14 is fixed to the filler pipe 12.

The hinge portion 13b of the flap valve 13
Is connected to one of the pivots 13c.
As shown in the arrow J, the torsion coil spring 16 is fitted in the pair of wall portions of the hinge bracket 14 while the torsion coil spring 16 is fitted in the flap valve 13 in the closing direction. Each end of the torsion coil spring 16 is resiliently engaged with the flap valve 13 and the hinge bracket 14, respectively, so that the flap valve 13 is attached to the filler pipe 12 via the hinge bracket 14. .

However, in the above-described conventional flap valve mounting structure, since the leg piece 14a is relatively inserted into the slot 15a of the holder 15, the holder 15
Is inserted into the filler pipe 12 in the axial direction thereof and then displaced (lifted) in the radial direction outward, so that there is a problem that the assembling operation is not easy and complicated.

[0008]

In order to solve such a problem and to realize a flap valve which can be easily attached, the present invention provides a flap valve for opening and closing a pipe line. A bracket for pivotally supporting the flap valve, bracket assembling means for assembling the bracket to the pipe, and a space between the flap valve and the bracket for resiliently urging the flap valve in a valve closing direction. Spring means interposed in the pipe, wherein the bracket assembling means is provided in the bracket so as to protrude into the pipe through the bracket mounting hole provided in the pipe wall of the pipe and the bracket mounting hole. And a rush amount regulating member provided on the bracket to be brought into contact with the outer peripheral surface of the pipe wall so as to regulate the rush amount of the rush portion. Part, a holder hole provided in the protrusion so as to face the pipe opening surface while protruding into the pipe, and can be inserted into the holder hole by inserting the pipe from the pipe opening surface in the axial direction of the pipe. And a holder formed so as to be engageable with the inner peripheral surface of the pipe in the inserted state, and holder positioning means for positioning the holder with respect to the holder hole.

[0009] According to this, the piercing portion of the bracket for pivotally supporting the flap valve projects into the pipe through the bracket mounting hole provided in the pipe, and the holder hole facing the pipe opening surface provided in the piercing portion. The holder is inserted into the bracket to prevent the hinge bracket from coming off. However, since the work for inserting the holder is performed by inserting the holder in the axial direction of the pipe, the holder of the holder for holding the bracket attached to the bracket mounting hole is retained. The work of assembling into the hole can be performed simply by inserting the work in the axial direction of the pipe.

The spring means comprises a torsion coil spring fitted on a pivot provided on the flap valve,
In the state where one end of the torsion coil spring is engaged with the flap valve, a temporary fixing projection that can engage the other end of the torsion coil spring is provided integrally with the flap valve. For example, the torsion coil spring can be integrally assembled with the flap valve before the flap valve is assembled to the bracket, and when the flap valve in that state is pivotally supported by the bracket, an elastic biasing force acts between the two. Instead, by attaching the bracket to the filler pipe and removing the other end of the torsion coil spring from the projection for temporary fixing, a resilient biasing force can be applied between the bracket and the flap valve. The assemblability of the spring can be improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to specific examples shown in the accompanying drawings.

FIG. 1 shows a flap valve 1 to which the present invention is applied.
FIG. 2 is an exploded perspective view showing the mounting structure of FIG. The part to which the flap valve 1 is attached is the same as that shown in FIG. 6 of the conventional example, and its illustration and description are omitted. As shown in FIG. 1, the pipe wall of the filler pipe 2 has a bracket assembling hole 2a in the upper part of the drawing near the opening end, similarly to the conventional example, and a hinge is provided using the bracket assembling hole 2a. The bracket 3 is assembled, and the flap valve 1 is rotatably assembled to the hinge bracket 3.

The flap valve 1 is formed such that a disc-shaped valve element 1a and a hinge portion 1b are integrally formed into an L-shaped cross-section as in the conventional example. A pair of pivots 1c are formed on both sides of the extension end of the hinge portion 1b so as to project in opposite directions and coaxially.
c is provided coaxially via a large-diameter boss 1d formed on the hinge 1b side. This large-diameter boss 1d is
This is for supporting a torsion coil spring 3 as a spring means for resiliently urging the flap valve 1 in the valve closing direction while being attached to the filler pipe 2 in a state of being fitted coaxially.

The flap valve 1 has a large-diameter boss 1d.
The one end 3a of the torsion coil spring 3 fitted in the valve body 1a and the hinge portion 1 can be engaged in the inserted state.
b. Furthermore, a circular boss-shaped temporary fixing member which can resiliently engage the other end 3b of the torsion coil spring 3 in the engagement state with the engagement hole 1f at the extension end of the hinge 1b. The large diameter boss 1d is located at a position where the protrusion 1e is far from the valve body 1a with respect to the large diameter boss 1d.
Are provided so as to protrude in parallel with the axis of.

A projection 4a formed in the lower half of the hinge bracket 3 made of synthetic resin in FIG. 1 is inserted into the bracket mounting hole 2a of the filler pipe 2. The protrusion 4a is formed to have a projection surface corresponding to the hole shape of the bracket mounting hole 2a. Its entry 4
In order to regulate the intrusion amount of a, a pair of lateral protrusions as a pair of intrusion amount restriction engaging portions formed at the middle portions of the left and right side surfaces of the hinge bracket 4 so as to abut against the outer peripheral surface of the filler pipe 2. 4b are provided symmetrically, and a pair of wall-like portions 4c facing in parallel with each other on the upper side of the intruding portion 4a in the drawing.
Is provided.

The flap valve 1 is provided on the pair of wall portions 4c.
Shaft support holes 4d for rotatably supporting both pivots 1c
When the flap valve 1 is assembled to the hinge bracket 4, as shown by an arrow A in FIG. 2, the two pivots 1c are easily inserted into each shaft support hole 4d. An inclined guide surface 4e is provided above each wall-shaped portion 4c in the drawing. Further, on the rear side in the figure between the two wall-shaped portions 4c of the hinge bracket 4, each reinforcing portion for preventing the two wall-shaped portions 4c from falling is integrally formed, respectively. A U-shaped groove 4f is provided for engaging the other end 3b of the torsion coil spring 3 in use.

Further, the protrusion 4a is provided with a holder hole 4g penetrating in the axial direction of the filler pipe 2 in a state of being inserted into the bracket mounting hole 2a. The holder 5 is inserted into the holder hole 4g.

The procedure for mounting the flap valve thus configured will be described below. First, the torsion coil spring 3 is fitted into the large-diameter boss portion 1d as described above, one end 3a of the torsion coil spring 3 is inserted into the engaging hole 1f and engaged, and the other end 3b is connected to the temporary fixing protrusion. 1e (see FIG. 2). The torsion coil spring 3 is twisted once to generate an initial spring load, and the other end 3b is resiliently engaged with the temporary fixing protrusion 1e. Thereby, it is possible to prevent the other end 3b from dropping off from the temporary fixing projection 1e, and to easily set the elastic force generation state in the valve closing direction in the final attachment state to the filler pipe 2 described later in advance. Can be set.

Further, as described above, the hinge bracket 4 is inserted into the bracket assembling hole 2a with the protrusion 4a as shown by the arrow B in FIG. 1 and faces the pipe opening surface 2b in the filler pipe 2. Holder hole 4
Insert the holder 5 into g. At this time, the holder 5 may be inserted in only one direction of the axial direction of the filler pipe 2 as shown by an arrow C in FIG. 1, and the manual insertion operation is easy. Note that the holder 5 is made of a synthetic resin material, as shown in FIG.
And as shown in FIG. 4, the main body portion 5a tapered to facilitate insertion of the front end portion in the insertion direction into the holder hole 4g.
And a rear wall 5b provided at the rear end in the insertion direction.

A tongue piece 5c is provided at an intermediate portion of the main body 5b so as to be deflected in three directions so as to be able to bend. A tongue piece 5c is provided on the lower surface in FIG. A collision portion 5d is formed. In order to prevent the holder 5 from coming off in a direction opposite to the direction of insertion into the holder hole 4g, as shown in FIG.
In the bottom wall of a, an engagement hole 4h with which the engagement protrusion 5d can be engaged.
Is provided. In the insertion direction of the holder 5, the above-mentioned rear wall portion 5b abuts on the opposing surface of the insertion portion 4a, and thus the holder 5 is positioned and prevented from coming off.

As described above, when the holder 5 is positioned with respect to the intruding portion 4a and is prevented from coming off, the front and rear ends of the holder 5 in the insertion direction are formed on the inner peripheral surface of the filler pipe 2 as shown in FIG. Since the holder 5 can be brought into contact with the holder pipe 5, the bolt is hung by the holder 5, the force of preventing the hinge bracket 4 from coming off is increased, and the hinge bracket 4 is integrally attached to the filler pipe 2. Then, as described above, the end 3b of the torsion coil spring 3 which is resiliently engaged with the temporary fixing projection 1e is removed from the temporary fixing projection 1e as shown by an arrow D in FIG. , And re-hang the U-shaped groove 4f as shown by the arrow E. By doing so, a resilient urging force acts between the hinge bracket 4 integrated with the filler pipe 2 and the flap valve 1 in a direction to close the flap valve 1, and the pipe opening surface 2 b becomes a flap valve. 1 prevents the fuel in the tank from flowing back into the filler pipe 2 during traveling.

As well shown in FIG. 5, U
An inclined guide surface 4i inclined toward the U-shaped groove 4f is provided on the wall-shaped portion 4c side of the U-shaped groove 4f, and an inclined guide surface is provided on a side of the U-shaped groove 4f opposite to the inclined guide surface 4i. Face 4i
A stopper 4j that is higher than the edge of the U-shaped groove 4f is provided. Thereby, when the end 3b of the torsion coil spring 3 is removed from the temporary fixing protrusion 1e, the end 3b is guided toward the U-shaped groove 4f by the inclined guide surface 4i, and the height of the stopper 4j is increased. This prevents the end 3b from jumping out of the U-shaped groove 4f,
The work of re-hanging the end 3b of the torsion coil spring 3 on the U-shaped groove 4f can be easily performed.

[0023]

As described above, according to the present invention, in order to prevent the bracket attached to the bracket mounting hole provided in the pipe from falling off, the mounting of the holder to the holder hole provided in the inwardly projecting portion of the bracket in the pipe is performed. The operation can be performed by a simple operation only by inserting the holder in the axial direction of the pipe, and the flat valve can be easily attached. Further, a temporary fixing projection which can engage with the other end of the torsion coil spring having one end engaged with the flap valve so as to elastically urge the flap valve in the valve closing direction is provided integrally with the flap valve. According to this, the torsion coil spring can be integrally assembled to the flap valve before the flap valve is assembled to the bracket, and the other end of the torsion coil spring is temporarily fixed after the bracket is assembled to the filler pipe. By removing the protruding portion from the protruding portion, a resilient biasing force can be applied between the bracket and the flap valve, so that the assemblability of the torsion coil spring can be improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a mounting structure of a flap valve to which the present invention is applied.

FIG. 2 is an exploded perspective view showing how to attach a flap valve to a hinge bracket.

FIG. 3A is a plan view of a holder, and FIG. 3B is a side cross-sectional view taken along line IIIa-IIIa of FIG.

FIG. 4 is an enlarged side sectional view of a main part showing how to attach the holder to the hinge bracket.

FIG. 5 is an enlarged perspective view of a main part showing how to attach a torsion coil spring to a hinge bracket.

FIG. 6 is a side sectional view showing a state where a flap valve is attached to a conventional filler pipe.

FIG. 7 is an exploded perspective view showing a conventional flap valve mounting structure.

FIG. 8 is a longitudinal sectional view showing a procedure for assembling a hinge bracket to a conventional filler pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flap valve, 1e Temporary fixing protrusion 2 Filler pipe, 2a Bracket mounting hole 3 Torsion coil spring, 3a, 3b end 4 Hinge bracket, 4a Entry portion, 4g Holder hole 5 Holder, 5c Tongue piece, 5d Engagement Projection 11 Fuel tank 12 Filler pipe 13 Flap valve 14 Hinge bracket 15 Holder

Claims (2)

[Claims] 1. A flap valve for opening and closing a pipe line, a bracket for pivotally supporting the flap valve,
A bracket assembling means for assembling the bracket to the pipe, and spring means interposed between the flap valve and the bracket to resiliently bias the flap valve in a valve closing direction; An assembling means regulates a bracket mounting hole provided in a pipe wall of the pipe, a protrusion provided in the bracket so as to protrude into the pipe through the bracket mounting hole, and a protrusion amount of the protrusion. The bracket is provided on the bracket so as to abut on the outer peripheral surface of the pipe wall so as to abut against the outer peripheral surface of the pipe wall. A holder hole and the pipe can be inserted into the holder hole by being inserted from the pipe opening surface in the axial direction of the pipe, and in the inserted state, the A flap valve comprising: a holder formed to be engageable with an inner peripheral surface of the pipe; and holder positioning means for positioning the holder with respect to the holder hole. 2. The torsion coil according to claim 1, wherein said spring means comprises a torsion coil spring fitted on a pivot provided on said flap valve, and one end of said torsion coil spring is engaged with said flap valve. The flap valve according to claim 1, wherein a temporary fixing projection that can engage with the other end of the spring is provided integrally with the flap valve.