JPH023530A - Fuel injection port - Google Patents

Abstract

PURPOSE:To hold a seal member in a non-load state during no need for a seal and to prevent the occurrence of permanent deformation, by a method wherein when a cap is inserted in a fuel suction port, a seal member forced into resilient contact with the outer periphery of a nozzle is pressed through a guide member by means of a pusher. CONSTITUTION:A fuel injection port 21 is formed with a cylindrical body part 23 in which a fuel cap is inserted, and a seal member 31 having a seal part 35 formed into resilient contact with the outer periphery of a fuel injection nozzle 19 disposed on the inner periphery of the body part 23. In this case, when the nozzle 19 is inserted in the body part 23, a guide member 41 is moved through a nozzle support part 47, and a seal part protecting part 43 is separated away from a seal part 35 and brought into close contact with the nozzle 19. Meanwhile, when a fuel cap is inserted in the body part 23, a cap support part 101 of a pusher 100 is brought into contact with the fuel cap, the guide member 41 is pressed by a press part 110, and the seal part protecting part 43 is separated away from the seal part 35.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a fuel inlet for a fuel tank, and is suitable for use in a vehicle.

<Prior art> Conventionally, for example, the configuration of a fuel injection port 1 for an automobile is as follows:
It was as shown in the figure. The fuel inlet 1 is a cylindrical member that projects obliquely upward and to the right from the right side wall of the fuel tank 3. In the figure, numeral 5 is a preserver hose, numeral 6 is a rolled oat valve, and numeral 7 is a canister.Then, insert the fuel injection nozzle 9 into the fuel injection port 1 and pour the fuel 11 into the tank 3. .

However, in the fuel injection port 1 having the above configuration, the nozzle 9
Since the relationship between the two was a clearance fit, the fuel vapor 12 vaporized in the tank 3 leaked out from the gap between the two.

Therefore, as shown in Fig. 17, a fuel injection port 10 having a seal member 13 on the inner peripheral surface has been proposed (see SAE Technical Paper 851204).
is a retainer, and numeral 17 is a trap door. In this fuel injection port 10, when the nozzle 9 is inserted, the trap door 17 opens to the back side, and the seal portion 14 of the seal member 13 continuously contacts the outer peripheral surface of the nozzle 9 in the circumferential direction (18th (see figure), this prevents the fuel paper 12 in the tank 3 from leaking to the outside.

<Problems to be Solved by the Invention> However, in the fuel injection port 10 shown in FIG.
When inserting the
There is a risk of interfering with and damaging it. In the damaged seal portion 14, the sealing effect of the fuel vapor 12 is reduced, which is not preferable.

Means for Solving the Problems> The present invention has been made in view of the above problems, and has a structure including a cylindrical main body portion into which a fuel cap is inserted, and a fuel cap disposed on the inner periphery of the main body portion. A fuel injection port for a fuel tank, comprising: a seal member having a seal portion made of an elastic polymer material that can be continuously brought into close contact with the outer circumferential surface of the fuel injection nozzle in the circumferential direction; (a)~(
A fuel inlet characterized by comprising a guide member with a pusher having the following requirements (force) to (ri); , comprising: a seal protection surface that prevents contact between the seal portion and the tip of the nozzle; and a nozzle receiving surface that is resiliently tight-fitted to the outer peripheral surface of the nozzle; (a) a seal member; (1) When the nozzle is not inserted into the main body, the guide member protects the seal with its seal protection surface. Then, with the nozzle inserted into the main body, the guide member moves according to the nozzle using its nozzle receiving surface, the seal protection surface separates from the seal, and the seal comes into close contact with the nozzle. (g) disposed between the fuel cap and the seal member so as to be movable in the axial direction of the main body, and (g) the fuel cap inserted into the main body. When the cap receiver is in contact with the fuel cap, the pressing part presses the guide member toward the back of the main body, the seal protection surface is separated from the seal, and the fuel cap is removed from the main body. When the guide member is released, the pusher presses the guide member.

<Examples> Hereinafter, the present invention will be explained in more detail based on examples. Note that the same members as those described in the conventional example are given the same reference numerals, and their explanations will be partially omitted.

The fuel inlet 21 in the embodiment is connected to the main body 2 as shown in FIG.
3. The main body 23, which includes the seal member 31, the guide member 41, the stopper 61, and the pusher 100, is a cylindrical member, and the left end in FIG.
The right end of the figure is the opening 24, and a cylindrical cover 120 is attached to the inner periphery of the opening 24. This cover 12
0 consists of a reduced diameter portion 121 and a straight portion 123.

The reduced diameter portion 121 serves to guide the tip of the nozzle 19 to the sealing member 31 and the guide member 41. Reference numeral 124 in FIG. 0 is a through hole. The straight portion 123 includes a protruding portion 125 that screws into the fuel cap F, and the right end in the figure is folded back and engages with a groove on the outer periphery of the opening 24. Reference numeral 127 in the figure indicates an opening. .

The seal member 31 is a cylindrical member made of NBR, and includes a large diameter base 33 and a tapered seal portion 3 continuous from the base 33.
It consists of 5.

The base portion 33 is fixed inside the inner circumference of the main body portion 23 . The fixation is achieved by sandwiching the base 33 between the base 63 of the stopper 61 and the retainer 140. Note that the peripheral edge of the valve 130 is interposed between the retainer 140 and the base 33. The seal portion 35 has an inner diameter smaller than the outer diameter of the nozzle 19. Therefore, when the nozzle 19 is inserted into the main body 23 as shown in FIG.
5 is in continuous and close contact with the outer peripheral surface of the nozzle 19 in the circumferential direction.

Further, as shown in FIG. 5, a bellows-shaped seal portion 35a may also be used. According to the seal portion 35a having such a shape,
More reliable sealing performance can be obtained for the nozzle 19 (
(See Figure 6).

Note that the material for forming the seal member 31 is
It is not particularly limited as long as it can be brought into close contact with the outer peripheral surface of the nozzle 19 to obtain a suitable seal between the seal portion 35 and the nozzle 19, and has oil resistance, weather resistance, etc.
In addition to the above-mentioned NBH, elastic polymer materials such as synthetic rubber such as fluororubber, thermoplastic elastomers such as polyester, polyvinyl chloride, and polyurethane may be used. It is sufficient that at least the seal portion 35 is formed of the above elastic polymer material.

As shown in FIG. 7.8, the guide member 41 consists of a seal protection part 43, a nozzle receiving part 47, and a flat part 51, and is made of a sheet metal having spring elasticity. The sealing member 31 is disposed concentrically toward the inner periphery of the sealing member 31 and six times in the axial direction of the main body portion 23 .

The seal protection portion 43 has a tapered shape, and its right end small diameter portion has an outer diameter larger than the outer peripheral surface of the nozzle 19 . Therefore, when the upper surface of the seal protection part 43 (seal protection surface 45) is pressed against the seal part 35, the second
As shown in the figure, this seal portion 35 is expanded. This makes it difficult for the tip of the nozzle 19 and the seal portion 35 to interfere with each other when the nozzle 19 is inserted into the main body portion 23. Note that a slit may be provided in the seal protection portion 43 from the viewpoints of (1) reducing weight and (2) ensuring flexibility of the nozzle receiving portion.

The nozzle receiving part 47 is a band-shaped member, and the seal part protecting part 4
Six lines extend from the right end of 3 and are folded back inward.

Furthermore, the free end of each nozzle receiving portion 47 is bent outward. The inner peripheral surface of each nozzle receiving portion 47 (nozzle receiving surface 4
9) is located on an imaginary truncated cone surface, the small diameter dimension (diameter) of this imaginary truncated cone surface is smaller than that of the outer peripheral surface of the nozzle 19, and each nozzle receiving portion 47 is formed of a metal material having spring elasticity. Therefore, when the nozzle 19 is inserted into the main body 23 (Fig. 3), the nozzle receiving surface 49
The outer circumferential surface of No. 9 is in a spring-elastic interference fit state. As a result, the guide member 41 does not slip with respect to the nozzle 19, and follows this movement toward the back of the fuel injection port 21 (to the left in the figure). Note that a step portion 48 is provided at the tip of each nozzle receiving portion 47 . This makes the engagement between the nozzle 19 and the nozzle 47 more reliable. Note that the number of nozzle receivers 47 formed is not particularly limited, and the nozzle receiver 4a shown in FIG. 5 may also be used. can. According to this nozzle receiving part 4a, the dimension (diameter) of the virtual circumference formed by the nozzle receiving surface 49a and the nozzle 1
9 is larger than that shown in FIG.
It becomes more slippery.

The flat portion 51 extends from the large diameter side of the seal portion protection portion 43 in the shape of a flange. Then, the peripheral edge portion 53 is bent to the left in the figure and slides onto the inner peripheral surface of the base portion 63 of the stopper 61 to form a pair.

Incidentally, the peripheral portion 53 can be embedded in a resin (or metal) slider so that the slider and the base 63 of the stopper 61 form a sliding pair, and the flat portion 51 can be reinforced. In the above embodiment, the guide member was made of sheet metal, but
Of course, it can also be made of a resin material having spring elasticity. In addition, this guide member is connected to the seal portion and the nozzle 1.
The configuration is not particularly limited as long as it includes a seal protection surface that prevents contact with the tip of the nozzle 19 and a nozzle receiving surface that is spring-elastically tightly fitted to the outer peripheral surface of the nozzle 19. It is also possible to use the guide member 41b shown in FIG. 9, which is made of soft synthetic resin. In this figure, reference numeral 45b indicates a seal portion protection surface, reference numeral 49b indicates a nozzle receiving surface, and reference symbol stb indicates a flat portion.

Reference numeral 57 in the figure is a compression coil spring.

The stopper 61 is a cylindrical member consisting of a base 63 and a spring seat 65. Although this stopper 61 is made of synthetic resin (such as polyamide), the material from which it is formed is not particularly limited as long as it has a predetermined rigidity. Reference numeral 67 in Figure 0 indicates an insert.

The base portion 63 is held between the retainer 140 and the seal member 31. Further, the base portion 63 may be bonded to the inner circumferential surface of the main body portion 23. The manner in which the two are fixed is not particularly limited, and for example, interference fitting may be used.

The spring seat portion 65 is bulged from the left end of the base portion 63 in the inner diameter direction.

The pusher 100 includes a cap receiving part 101 and a pressing part 1.
It consists of 10.

The cap receiving part 101 has a structure in which a receiving pawl 105 extends from a dish-shaped base 103 to the right side.

A total of three receiving claws 105 are arranged at intervals of 120 degrees, and their tips 107 are bent toward the center. Each tip 107 is connected to the cover 1.
It protrudes from the opening 127 of 20. This tip portion 107 then comes into contact with the tip of the fuel carb F, as shown in Fig. 341.

The pressing portion 110 is a rod-shaped member that protrudes from the base 103 to the left side. The pressing parts 110 are also mutually 120
There are a total of three trees arranged at equal intervals. This pressing portion 110 includes pressing plates 150, 151. It passes through the base 33 of the seal member 31 in a clearance fit manner, and its tip is brought into contact with the flat part 51 of the seal protection part 43.

Each of the cap receiving parts 101 and the pressing part 110 is a rigid body (made of metal material), and the distance between the tip 107 of the cap receiving part 101 and the tip of the pressing part 110 is kept constant.

And, the retainer 140 and cap receiving part 101 described
A pair of pressing plates (outer pressing plate 150, inner pressing plate 151) are arranged between the two pressing plates 15 and 15.
Compression coil spring between 0.151! 55 is interposed. The pressing plate actor 150 constantly presses the cap receiving part 1.
01, and the suppressing plate inner 151 is in contact with its bulge! 52 presses the inner peripheral edge 131 of the valve 130 with a predetermined pressure.

Thereby, this valve 130 always closes the through hole 160 formed in the base 33 of the seal member 31 (
Figures 1-3). However, if the auto-stop or the like of the nozzle 19 malfunctions and fuel overflows, the inner press plate 151 moves eight times to the right as shown in FIG. As a result, the valve 130 that had closed the through hole 160 opens, and fuel flows backward from the through hole 160 (the flow of fuel is indicated by an arrow). Thereby, it is possible to prevent the internal pressure of the tank 3 from becoming abnormally high.

In addition, valves are shown in Figures 10 and 11! A front view and a sectional view of 30 are shown. Similarly, the notch 133 in the valve 130 and the pressure plate inner are shown in FIG. 12.13, a front view and a sectional view of the retainer 120, and FIG. The pressing portions 110 are passed through the through holes 153 in each of the through holes 151 .

Next, the operation of the fuel injection port 21 of the embodiment will be explained.

State in which the fuel cap F is inserted into the main body portion 23 (FIG. 1) In this state, the catch 105 of the cap receiving portion 101 at the end of the fuel cap F is pushed to the left. Therefore, the pressing part 110, which is maintained at a constant distance from the cap receiving part 1.degree. 1, moves to the left, and the guide member 41 moves to the left. As a result, the seal portion protection portion 43 is separated from the seal portion 35. Therefore,
The seal portion 35 is not expanded and is in an unloaded state.

Note that on the country side, the outer tip of the seal protection part 43 is in contact with the inner surface of the seal part 35, but the seal part 35 is not expanded.

This state is a general usage state of the vehicle.

At this time, since the seal portion 35 is in an unloaded state, no permanent deformation occurs.

When the fuel cap F is removed from the main body 23 (Fig. 2) When the fuel cap F is removed from the main body 23, the spring 5
Pusher 100 moves to the right side when pushed by 155.
The state shown in Figure 2 will be reached. In this state, the guide member 41 is also pushed to the right by the spring 57, and the seal protection surface 4
5 expands the seal portion 35. As a result, when the seal portion 35 is viewed from the opening 24 side in FIG. 2, it is hidden deep inside the reduced diameter portion 121 of the main body portion 23. Therefore, when inserting the nozzle 19 into the fuel injection port 21, the tip of the nozzle 19 hardly interferes with the seal portion 35.

State where the nozzle 19 is inserted into the main body 23 (FIG. 3) When the nozzle 19 is inserted into the main body 23, the guide member 41
is temporarily fixed to the tip of the nozzle 19 by its nozzle receiving surface 49, and moves along with the nozzle 19 in the insertion direction (i.e.
move to the back). Then, the seal portion protection surface 45 is separated from the seal portion 35, and the seal portion 35 is continuously brought into close contact with the outer circumferential surface of the nozzle 19 in the circumferential direction. This ensures sealing performance against fuel vapor.

Further, when the nozzle 19 is inserted, the guide member 41 cannot be moved further back due to the pressure of the spring 57a. When the nozzle is further pushed in, the guide member 41 is relatively shifted from being fixed to the tip of the nozzle 19 toward the base of the nozzle 19, resulting in the state shown in FIG. 3. In addition,
Since an automatic fuel stopper is generally provided at the tip of the nozzle 19, the tip of the nozzle 19 is required to be inserted deeper than the stopper 61.

When refueling is completed and the nozzle 19 is pulled out, the guide member 4
1 follows the nozzle 19 and moves to the right in the figure. Then, the guide member 41 brings its seal portion protection portion 43 into contact with the seal portion, and its movement to the right is thereby restricted, leaving the nozzle 19 and returning to the state shown in FIG. 2. Then, when the fuel cap F is reinserted into the main body 23, the pusher 1°0 moves to the left in the figure and returns to the state shown in FIG. 1.

<Operations and Effects of the Invention> As explained above, the fuel injection port of the present invention includes a bay-shaped main body into which a fuel cap is inserted, and a fuel injection nozzle disposed on the inner periphery of the main body. A fuel inlet for a fuel tank, comprising a seal member having a seal part made of an elastic polymer material that can be continuously contacted in the circumferential direction on the outer peripheral surface, and which meets the following requirements (A) to (T). and a pusher having the following requirements (force) to (ri); (7) The guide member is configured to expand the seal portion to It comprises a seal part protection surface that prevents contact between the seal part and the tip of the nozzle, and a nozzle receiving surface that elastically fits into the outer circumferential surface of the nozzle, and (a) the inner part of the seal member. The guide member is arranged so as to be movable concentrically inward and in the axial direction of the main body, and (1) when the nozzle is not inserted into the main body, the guide member protects the seal part with its seal protection surface. , With the nozzle inserted into the main body, the guide member moves according to the nozzle by its nozzle receiving surface, the sealing part protection surface is separated from the sealing part, and the sealing part is brought into close contact with the nozzle. (Force) The pusher is It comprises a cap receiving part and a pressing part, and is disposed between the ladle fuel cap and the sealing member so as to be movable in the axial direction of the main body, and (i) the fuel cap is inserted into the main body. In some cases, the cap receiver comes into contact with the fuel cap, the pressing part presses the guide member towards the back of the main body, and the seal protection surface is separated from the seal, causing the fuel cap to be removed from the main body. Sometimes the pusher is released from the guide member.

According to the fuel inlet having such a configuration, when the vehicle is in normal use (with the fuel cap inserted into the main body), the busher separates the seal protection surface from the seal, rendering the seal ineffective. By maintaining the load state, permanent deformation of the seal portion can be prevented.

When the fuel cap is removed from the main body for refueling, the action of the pusher is released and the seal is protected by the seal protection surface. Therefore, when inserting the nozzle into the main body, the tip of the nozzle does not interfere with the seal portion.

Therefore, the seal portion is less likely to be damaged, and sealing performance against fuel vapor is ensured.

Furthermore, when the nozzle is inserted into the main body, the nozzle receiving surface is resiliently tight-fitted to the outer circumferential surface of the nozzle, so the guide member follows the nozzle in the nozzle insertion direction (i.e., toward the back of the main body). ) to move B. Then, the seal portion protection surface is separated from the seal portion, and the seal portion is brought into continuous and close contact with the outer circumferential surface of the nozzle in the circumferential direction. This provides a sealing effect on the fuel paper.

[Brief Description of the Drawings] Fig. 1 is a sectional view of the main body 23 with the fuel cap F inserted, Fig. 2 is a sectional view of the main body 23 with the fuel cap removed, and Fig. 3 4 is a sectional view showing a mechanism for releasing overflowing fuel 11, FIG. 5.6 is a sectional view showing a modified fuel injection port, and FIG. 7 is a sectional view of the guide member 41, FIG. 8 is a front view of the guide member 41, FIG. 9 is a sectional view showing a modified guide member 41b, FIG. 10 is a front view of the valve 130, and FIG. 11 is a front view of the guide member 41. 12 is a front view of the retainer 120, FIG. 13 is a vertical sectional view of the retainer 120, FIG. 14 is a front view of the inner suppression plate 151, and FIG. 15 is a longitudinal sectional view of the inner pressure plate 151. 16 is a sectional view of a conventional fuel injection port 1, and FIGS. 17 and 18 are sectional views of a conventional fuel injection port 1o. 1.10, 21... Fuel inlet, 13.31... Seal member, 14.35... Seal portion, 19... Nozzle, 23... Main body, 41.41b... Guide member, 45.45b... Seal part protection surface, 49.45a, 49b... Nozzle receiving surface, 100...
-Pusher 1 101--Cap receiving part, 110...Pressing part, F...Fuel cap. Patent application Toyoda Gosei Co., Ltd. 9T Figure 4 Whistle 14 Figure 15

Claims (1)

[Claims] A cylindrical main body into which a fuel cap is inserted; A guide member for a fuel tank comprising: a sealing member having a sealing portion made of a polymeric material; and a guide member meeting the following requirements (a) to (c); ); (a) The guide member expands the seal portion to prevent contact between the seal portion and the tip of the nozzle. and a nozzle receiving surface that spring-elastically tight-fits into the outer circumferential surface of the nozzle; (c) When the nozzle is not inserted into the main body, the guide member protects the seal with its seal protection surface, and With the nozzle inserted, the guide member moves according to the nozzle with its nozzle receiving surface, the sealing portion protection surface is separated from the sealing portion, and the sealing portion is brought into close contact with the nozzle. (f) the pusher includes a cap receiving part and a pressing part; (g) the pusher is disposed so as to be movable in the axial direction of the main body between the fuel cap and the sealing member; (h) When the fuel cap is inserted into the main body, the cap receiving part contacts the fuel cap, and the pressing part presses the guide member toward the back of the main body, When the seal protection surface is separated from the seal and the fuel cap is removed from the main body, the pusher presses the guide member.