JPH0357723A - Fuel pouring port - Google Patents

Abstract

PURPOSE:To protect a sealed part by attaching a seal protecting part and a sealed part in the state before a nozzle is inserted into a body part and shifing a nozzle following part when the nozzle is inserted into the body part and separating one between the seal protecting part and the sealed part from the other through a connection part. CONSTITUTION:When a fuel cap F is demounted from a body part 23, a retainer 50 and a pusher 100 are shifted rightward by the pushing of a spring 55, and a sealed part body 43 rides over a seal protecting surface 35, and a sealed part 40 is put into the consealed state to the innermost part of the protecting surface 35, viewed from a cover 30 side, and when a nozzle 19 is inserted into a fuel pouring port 21, the top edge part of the nozzle 19 hardly interferes with the sealed part 40. Further, when the nozzle 19 is inserted into the body part 23, the nozzle 19 contacts the nozzle flowing part 27 of a shift member 67, and the nipped state by a guide surface 62 is generated, and a following part 71 is nipped between an inclined surface 65 and the nozzle 19 at the end, and the sealed part 40 is separated from the protecting surface 35, and the body 43 is clocely attached in continuation in the circumferential direction onto the outer peripheral surface of the nozzle 19, and the fuel vapor is sealed.

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 inlet 1 for an automobile is as follows:
It was as shown in the figure. The fuel inlet 1 is a cylindrical member that projects diagonally upward to the right from the right wall of the fuel tank 3. In addition, the code|symbol 5 in a figure is a preserver hose, the code|symbol 6 is a rollover valve, and the code|symbol 7 is a canister. Then, the fuel injection nozzle 9 is inserted into the fuel injection port 1, and the fuel 11 is poured 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.
(See Technical Paper 851204). The reference numeral 15 in the figure is a retainer, and the reference 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 continuously comes into close contact with the outer peripheral surface of the nozzle 9 in the circumferential direction (12th
(see figure). As a result, the fuel paper 12 inside the tank 3
Do not leak outside.

Problems to be Solved by the Invention> However, in the fuel injection port 10 shown in FIG.
When inserting the seal, there is a risk that its tip (which usually has many scratches on its surface) may interfere with the seal portion 14 and damage it.

A damaged seal portion 14 is not preferable because it reduces the sealing effect of the fuel vapor 12.

Means for Solving the Problems> The present invention has been made in view of the above problems, and has a structure in which an elastic polymer material that can be continuously and closely attached to the outer peripheral surface of the fuel injection nozzle in the circumferential direction is used. A fuel inlet for a vehicle fuel tank comprising a seal part on the inner periphery of a cylindrical main body, the seal part being brought into contact with the seal part to expand the seal part, and the seal part and the tip of the nozzle. At least one of the seal protection part and the seal part is disposed in the main body so as to be movable in the axial direction, and the seal protection part or the means for moving the seal part or a guide surface disposed at a position on the back side of the seal portion and having at least a slope that widens to the rear, a nozzle follower portion that is movable in the axial direction of the main body portion while being guided by the guide surface, and the nozzle follower portion and the seal. A connection part provided between the protection part or the seal part, and before the nozzle is inserted into the main body, the seal protection part and the seal part are in contact with each other, and the nozzle is inserted into the main body. When the nozzle following part is inserted between the outer circumferential surface of the nozzle and the guide surface, the nozzle following part moves toward the back of the slope, and as a result, one of the seal protection part and the seal part separates from the other through the connection part. It is characterized by a structure in which the seal part moves closely to the outer circumferential surface of the nozzle. Examples> This invention will be explained in more detail below based on examples. Note that the same members as those explained in the conventional example are given the same reference numerals, and their explanations will be partially omitted. 1st Embodiment (Figs. 1 to 5) In this embodiment, the fuel inlet 21 is (1) as shown in Fig. 1.
) Main body part 23, (2) Cover 30, (3) Seal part 40
, (4) moving part 60, (5) safety valve mechanism 80 and (6)
It is equipped with 100 pushers. (1) The main body part 23 is a cylindrical member, and the left end in FIG. 1 is connected to the tank 3. The right end of the figure is the opening 24, to which the cap F is attached via the cover 30. (2) The cover 30 has a cylindrical shape and is attached to the inner periphery of the opening 24. The cover 30 consists of a reduced diameter part 31 and a straight part 33. A protector 34 is attached to the right side (inner surface) of the opening of the reduced diameter portion 31 in the drawing. On the other hand, the outer surface of the reduced diameter portion 31 serves as a seal protection surface 35.

The reduced diameter portion 31 has a diameter larger than the outer peripheral surface of the nozzle 19. Then, as shown in FIG. 2, when the seal portion 40 moves to the right, the seal portion main body 43 rides on the seal protection surface 35 and expands.

This prevents the tip of the nozzle 19 from interfering with the seal portion 40 when the nozzle 19 is inserted into the main body portion 23. Note that slits may be formed in the reduced diameter portion 31 from the viewpoint of weight reduction and the like.

Further, the reduced diameter portion 31 guides the nozzle l9 to a predetermined insertion trajectory. The straight rod 33 is provided with a protruding portion 36 that screws into the fuel cap F, and has a free end that is folded back. Reference numeral 37 in the figure is an opening.

(3) As shown in FIG. 5, the seal 40 is a substantially donut-shaped member made of NBR, and is composed of a base 41 and a thinner seal main body 43. The base 41 is fixed to a retainer 50. The fixation mode is such that the base 4 is placed between the outer cylinder 51 and the inner cylinder 53 of the retainer 50.
By inserting 1. Of course, screw fastening, screw fastening,
It is also possible to adopt an embodiment such as adhesion. Note that the moving member 67
Similarly, the right 1 part (ring-shaped part 69) of the outer/inner cylinder 5
It is held between 1 and 53. The retainer 50 is biased toward the right side in the drawing by a compression coil spring 55.

Twelve ribs 45 are formed on the seal body 43 to prevent the thin seal body 43 from being disorderly deformed (rolling up, etc.).

The material for forming the seal portion 40 is the wooden body 4 of the seal portion.
3 in close contact with the outer peripheral surface of the nozzle 19, and the seal body 4
It is not particularly limited as long as it can provide a suitable seal between the nozzle 3 and the nozzle 19 and has oil resistance, weather resistance, etc. In addition to the above NBR, synthetic rubbers such as fluororubber and fluorosilicone rubber, polyester-based, and polyvinyl chloride-based rubbers. Elastic polymeric materials such as thermoplastic elastomers such as polyurethane can be used. It is sufficient that at least the seal portion main body 43 is formed of the above-mentioned elastic polymer material.

(4> The moving part 60 as a moving means is composed of a guide member 61 and a moving member 67. The guide member 61 is fixed inside the main body part 23,
The minimum inner diameter portion is a straight surface 63, and a slope 65 that widens inward is formed from there. This straight surface 63
A guide surface 62 is composed of the slope 65 and the slope 65. The slope can also be a curved surface as long as it has a width of m.

As shown in FIG. 6.1, the moving member 67 has four strip plates extending from a ring-shaped portion 69, and the tips thereof are folded back to form a loop-shaped nozzle following portion 71.

A connecting portion 75 is formed by the straight portion 73 of the band plate and the ring-shaped portion 69. Through this connecting portion 75, the nozzle following portion 71 and the seal portion 40 are connected. In the unloaded state of each strip of the moving member 67, the fully extended nozzle following portion 71 is brought into contact with the slope 65, as shown in FIG.

In addition, although this moving member was made entirely of sheet metal in the embodiment, it is of course not limited to this. For example, a synthetic resin solid body (such as a sphere) can also be used as the nozzle follower.

(5) The safety valve mechanism 80 is composed of a valve seat surface 81 and a valve portion 87 (see Fig. 4). The valve seat surface 81 extends from the tapered surface 83 of the large diameter portion at the right end of the guide member 61 and the outer peripheral surface 85 of the outer cylinder 51 of the retainer 50 . On the other hand, the valve portion 87 includes a gasket 91 made of synthetic rubber held by an annular retainer 89, and a gasket 91 made of synthetic rubber held by an annular retainer 89.
It consists of a compression coil spring 93 that biases the spring 93 to the left, and an annular spring seat 95 that receives the spring 93.

As a result, the gasket 91 is connected to the tapered surface 83 and the outer cylinder 51.
is pressed between the valve seat surface 81 and the outer circumferential surface 85 of the valve seat surface 81 to obtain sealing performance between the valve seat surface 81 and the gasket 91 (the state shown in FIGS. 1 to 3).

However, if the stop of the nozzle 19 breaks down and fuel overflows, the pressure will cause the valve part to
7 moves to the right side in the figure (the state shown in FIG. 4). As a result, as shown by the arrow in FIG. 4, the valve seat. Fuel flows backward between the surface 81 and the gasket 91 → through the through hole 97 formed in the spring seat 95. Therefore, it is possible to prevent the internal pressure of the tank 3 from becoming abnormally high. (6) The pusher 100 consists of a pressing part iot and a cap receiving part 103. The pressing portion 101 is an annular member that is externally fitted onto the seal protection surface 35 of the cover 30 in a clearance fit relationship, and is in contact with the retainer 50. Cap receiving part 103
are extended to the right from the contact portion 101 at intervals of 120 degrees, and are bent outward at the free end passing through the opening 37 of the cover 30. This tip 105 then comes into contact with the tip of the fuel cab F, as shown in FIG. Each pressing portion 101 and cap receiving portion 103 are each formed of a rigid body (made of metal material).

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

A state in which the fuel cap F is inserted into the main body 23 (Fig. 1) In this state, the end of the fuel cap F is pushing the cap receiving part 103 to the left. Therefore, the retainer 50 is pushed by the pressing portion 101 and moved to the back side.
This causes the seal portion 40 to be separated from the seal safety surface 35. Therefore, the seal portion main body 43 is not expanded and is in an unloaded state.

This state is a general usage state of the vehicle.

At this time, the seal main body 43 is under no load, so it will not undergo permanent deformation.The state in which the fuel cap F is removed from the main body 23 (Fig. 2).The fuel cap F is removed from the main body 23. When removed from the spring 55
The retainer 5o and the busher 100 are pushed to the right and are in the state shown in FIG.

In this state, the seal portion main body 43 rides on the seal protection surface 35 and expands. As a result, when the seal portion 40 is viewed from the cover 30 side in FIG. 2, it is hidden deep within the seal retaining surface 35. Therefore,
When inserting the nozzle 19 into the fuel injection port 21, the nozzle 1
The tip of No. 9 hardly interferes with the seal portion 40. Further, the moving member 67 also moves to the right side along with the retainer 50, and its nozzle following portion 71 rides on the straight surface 63.

State in which the nozzle 19 is inserted into the main body 23 (FIG. 3) When the nozzle 19 is inserted into the main body 23, the nozzle 19 is guided to a predetermined trajectory by the cover 30. When the nozzle 19 is further inserted, the nozzle 19 comes into contact with the nozzle following portion 7l of the movable member 67, and is sandwiched between the guide surface 62 and the nozzle following portion 7l. This nozzle following section moves to the back side as the nozzle 19 is inserted. Therefore, the nozzle following section 7
1 is finally sandwiched between the slope 65 and the nozzle 19. When the state shown in FIG.
5, and the seal portion main body 43 is in continuous and close contact with the outer circumferential surface of the nozzle 19 in the circumferential direction.

This ensures sealing performance against the fuel paper. Furthermore, even if the spring 55 acts, the movable member 67 will not shift to the right because the slope 65 is undercut. Therefore, as long as the nozzle 19 is inserted into the fuel injection port 21, the moving member 67 is in the state shown in FIG.
9 and cannot seal against the fuel paper. ). When refueling is completed and the nozzle 19 is pulled out, the movable member 67 is moved to the right by the biasing force of the spring 55. In other words,
The nozzle following part 71 rides on the straight surface 63 and the second
When the fuel cap F, which returns to the state shown in the figure, is reinserted into the main body 23, the pusher 100 moves to the left in the figure, returning to the state shown in FIG. 1.

Second Embodiment Figures 7 to 9 show a fuel injection port 110 of another embodiment.
Note that the same members as those described in the first embodiment are given the same reference numerals, and their explanations will be partially omitted.

The fuel inlet 110 of this embodiment includes a main body part 23, a seal part 111, a seal protection part 120, a guide part 130, a moving part 140, and a bushing 170.

This embodiment is characterized in that the seal portion 111 is fixed and the seal protection portion 120 is movable. The seal portion 111 is a cylindrical member made of NBRi, and includes a large diameter base portion 113 and a tapered seal portion body 115 continuous from the base portion 113. The base portion 113 is fixed inside the inner periphery of the main body portion 23 .

The seal body 115 has an inner diameter smaller than the outer diameter of the nozzle 19. Therefore, the nozzle 19 is
When inserted into the seal body! 15 is in continuous and close contact with the outer peripheral surface of the nozzle 19 in the circumferential direction. The seal protection portion 120 is tapered, and the small diameter portion at the right end thereof has an outer diameter larger than the outer peripheral surface of the nozzle 19. In addition, the upper surface of the seal protection section 120 is connected to the seal section main body 11.
5, the seal main body 115 is expanded as shown in FIG. This makes it difficult for the tip of the nozzle 19 to interfere with the seal body 115 when the nozzle 19 is inserted into the main body 23. In addition, the seal protection part 120 has ■light weight and ■guide part 13.
A slit can be inserted to ensure flexibility of 0. The guide portion 130 is a band-shaped member, and the seal protection portion 20
Six lines extend from the right end of the box and are folded back inward. Furthermore, the free end of each guide portion 130 is bent inward. The inner circumferential surface of each guide portion 130 is located on a virtual truncated cone surface, and the small diameter dimension (diameter) of this virtual truncated cone surface is the same as that of the nozzle 19.
smaller than that of the outer circumferential surface of. Since each guide member 130 is made of a metal material having spring elasticity, when the nozzle 19 is inserted into the main body 23, the guide member 130 is fitted into the outer peripheral surface of the nozzle 19 with a spring elastic tight fit. Become. This stabilizes the trajectory of the nozzle l9. The moving member 140 is composed of a guide member 141 and a moving member 147. The guide member 141 is fixed to the inside of the main body 23, and has a straight surface 143 at its minimum inner diameter, and a slope 145 extending outward from the straight surface 143. A guide surface 142 is constituted by the straight surface 143 and the slope 145. As shown in FIG. 9, the movable member 147 cuts and raises the engagement ring 151 from the ring-shaped ring 149 and extends approximately U thereto.
It has a configuration in which an arm 153 bent into a letter shape is engaged, and a nozzle follower part 155 is pivotally attached to the tip of the arm 153. The connecting portion 1 is formed by the arm 153 and the ring-shaped portion 149.
57 is formed. This connecting portion 157 connects the nozzle following portion 155 and the seal protection portion 120. In FIG. 9, reference numeral 127 indicates the inner cylinder 1 of the retainer 123.
It is 27. The engaging portion 151 fits into a notch 128 formed in the inner cylinder 127, and the ring-shaped portion 14
The general part of 9 is an inner cylinder! 27 and the vertical wall of the outer cylinder 125. A total of four retaining parts 151 are cut and raised at approximately 90 degree intervals in the ring-shaped part 149, and each has an arm 153 and a nozzle following part 155.
is installed. The button shear 170 has a cap receiving part 171 and a pressing part 1.
It consists of 80.

The cap retainer 171 has a configuration in which a retainer pawl 175 extends from a dish-shaped base 173 to the right side. Uke Tsume 17
5 are arranged at intervals of 120 degrees, a total of three of them, and their tips 177 are bent toward the center.
Each tip 177 is connected to an opening 191 of the cover 190.
It stands out from the This tip 177 then comes into contact with the tip of the cap F as shown in FIG. The pressing portion 180 is a rod-shaped member that protrudes from the base portion 173 to the left side. This pressing part 180 is also mutually 120
There are three in total, spaced at equal intervals. and,
This pressing portion 180 penetrates through the base 113 of the seal 11l and brings its tip into contact with the retainer 123. Note that by attaching a check valve or the like to the base 113 of the seal 111, a safety valve mechanism can also be provided in this embodiment. Next, the operation of the fuel injection port 110 of this embodiment will be explained. The state in which the fuel cap F is inserted into the main body 23 (Fig. 7) In this state, the end of the fuel cap F presses the catch 175 of the cap receiving part 171, and the button 1
70 is pushed to the left.

Therefore, the retainer 123 is moved to the left by the pressing part 180, and the seal protection part 120 is moved to the left side by the seal part main body 115.
This will result in further separation. Therefore, the seal body 115
is not expanded and is in an unloaded state.

State in which the fuel cap F is removed from the main body 23 (Fig. 8) When the fuel cap F is removed from the main body 23, the retainer 123 and the bushing 100 are pushed by the compression coil spring 129 and move to the right side. The state shown in Figure 8 will be obtained. In this state, the seal protector 120 has expanded the seal main body 115. As a result, the seal portion 11 in FIG.
1 when viewed from the opening 24 side, this is the cover 19
It is hidden deep inside the reduced diameter part of 0. Therefore, nozzle 1
9 into the fuel injection port 110, the tip of the nozzle 19 hardly interferes with the seal portion 111. When the nozzle 19 is inserted into the fuel injection port 110, the nozzle 1
9 comes into contact with the nozzle following portion 155 of the moving member 141 and is sandwiched between the guide surface 142 and the nozzle following portion 155 . This nozzle following section 155 moves to the back side as the nozzle 19 is inserted. Therefore, the nozzle following section 155 is finally sandwiched between the slope 125 and the nozzle 19.
This allows the seal protector 12 to be removed from the seal main body 115.
0 is spaced apart, and the seal body 115 comes into close contact with the outer periphery of the nozzle 19, ensuring sealing performance against fuel vapor. Note that the operation after the nozzle 19 is pulled out is the same as in the previous embodiment. Functions and Effects of the Invention> As explained above, according to the fuel inlet of the present invention,
The seal protector protects the seal before inserting the nozzle into the fuel injection port. Therefore, when inserting the nozzle into the fuel injection port, the tip of the nozzle does not interfere with the seal portion. Therefore, the seal part is less likely to be damaged and sealing performance against fuel vapor is ensured. Furthermore, when the nozzle is inserted into the fuel injection port, the nozzle following section is sandwiched between the nozzle and the guide surface. Then, due to the frictional force generated at that time, the nozzle follower moves to the back side following the nozzle. Therefore, the seal part or the seal protection part connected to the nozzle follower part via the connecting part also moves to the back side, and these parts are separated from each other. As a result, the seal portion comes into continuous and close contact with the outer circumferential surface of the nozzle in the circumferential direction. Therefore, the sealing action against the fuel vapor during refueling is ensured.

[Brief explanation of drawings]

Fig. 1 is a half-sectional view of the fuel inlet 21 of the first embodiment with the L-cap F inserted, and Fig. 2 is a half-sectional view of the fuel inlet 21 of the first embodiment with the L-cap F removed. , FIG. 3 is a half-sectional view of the nozzle 19 inserted into the fuel injection port 21, FIG. 4 is a half-sectional view of the safety valve mechanism 80 that releases overflowing fuel, and FIG. 5 is a half-sectional view of the seal 40. 6 is a partial perspective view of the movable member 67, FIG. 7 is a half-sectional view of the fuel cap F inserted into the fuel inlet 110 of the second embodiment, and FIG. 8 is the fuel inlet 110 of the second embodiment. Half-sectional view of 110 with fuel cap F removed, '! Fig. J9 is an exploded perspective view of the moving member 147, Fig. 10 is a sectional view of the fuel injection port 1 of the conventional example, and Figs. 11 and 12 are sectional views of the fuel injection port 10 of the conventional example. 1,10.21,110...fuel inlet, 14,40
, 111... Seal part, 9.19... Nozzle, 23... Main body part, 35, 120... Seal protection part, 60, 140... Moving part, 62, 142... Guide surface , 6 5 , 6 7 , 7 1 , 7 5 . 145... Slope, 147... Moving member, 155... Nozzle following part, 157... Connecting part. Patent application person? ．． 1: 1^-war first + ma. ■ oc + 4 Toto 1 -- -- (n Fl's Ro OΦ's Toto 5th Fig. 40 Fig. 6 Flute 9 Fig. 10

Claims (1)

[Scope of Claims] Fuel for a fuel tank for a vehicle, comprising a seal part made of an elastic polymer material that can be continuously and closely contacted in the circumferential direction on the outer peripheral surface of a fuel injection nozzle, on the inner periphery of a cylindrical main body part. at least one of: a seal protection part that is an injection port and abuts against the seal part to expand the seal part and prevents contact between the seal part and the tip of the nozzle; and the seal part. is disposed within the main body portion so as to be movable in the axial direction, and the seal protection portion or seal portion moving means is disposed at a position further back than the seal protection portion or seal portion, so that the seal protection portion or the seal portion is moved at least inwardly. a guide surface having an inclined surface; a nozzle following section that is movable in the axial direction of the main body while being guided by the guide surface; and a connection provided between the nozzle following section and the seal protection section or the seal section. The seal protection portion and the seal portion are in contact with each other before the nozzle is inserted into the main body portion, and when the nozzle is inserted into the main body portion, the nozzle follows the nozzle. part is sandwiched between the outer peripheral surface of the nozzle and the guide surface,
The slope is moved to the back side, and one of the seal protection part and the seal part is moved away from the other via the connection part, and the seal part is brought into close contact with the outer peripheral surface of the nozzle. Features a fuel inlet.