JPH02106434A - Fuel injection port - Google Patents

Abstract

PURPOSE:To prevent the breakage of a sealed part and improve the sealing performance by allowing a cam part to revolve and press a cam follower part, accompanied with the insertion of a fuel injection nozzle into the body part of a fuel injection port, and by closely attaching the sealed part onto the nozzle. CONSTITUTION:When a fuel cap is demounted from a body part 23, a cylinder part 72 and a pusher 100 shift rightward by the pressing by a spring 85. At this time, a sealed part body 33 rides over a seal protecting part 40 and spreads, and conceals the sealed part 30 in the innermost part of the seal protecting part 40, and the interference of a nozzle 19 inserted into a fuel injection port 21 with the sealed part 30 is prevented. When the nozzle 19 is inserted into the body part 23, the nozzle 19 contacts one surface 75a of a cam body part 75, guided by the guide parts 130 and 50, and revolves the cam body part 75. The other surface 75b of the cam body part 75 contacts a cam follower pat 71, and presses said cam follower part 71 to the innermost side of the fuel injection port 21. Further, the sealed part body 33 closely contacts the nozzle 19, and seals the fuel vapor.

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 obliquely upward and to the right from the right side 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 loose fit, the fuel paper 12 vaporized in the tank 3 leaked out from the gap between the two.

Therefore, as shown in FIG. 11, a fuel injection port 10 having a seal portion 14 on the inner peripheral surface has been proposed (see SAE Technical Vapor 851204). In the figure, reference numeral 15 is a retainer, and 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 and the seal portion 14 continuously comes into close contact with the outer peripheral surface of the nozzle 9 in the circumferential direction (see FIG. 12).
.

Thereby, the fuel paper 12 in the tank 3 will not leak out to the 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.

In the damaged seal portion 14, the sealing effect of the fuel paper 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 in which an elastic polymer material that can be continuously and closely attached to the outer circumferential surface of a fuel injection nozzle in the circumferential direction. 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. A cam follower section connected to a movable member of the seal protection section, and a cam section having a surface that contacts the outer peripheral surface of the nozzle and a surface that contacts the cam follower section, and inserts the nozzle into the main body. In the previous state, the cam follower part is in a position where the seal protection part and the seal part are in contact with each other, and when the nozzle is inserted into the main body part, the cam part rotates and presses the cam follower part towards the back of the main body part. It is characterized by a configuration in which the seal portion and the seal protection portion are separated and the seal portion is brought into close contact with the nozzle.

<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.

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) Seal part 30, (3) Seal protection part 40, (4) Guide part 50, (5) Moving means 70,
(6) Stopper 87, (7) Safety valve mechanism 90 and (8)
A pusher 100 is provided.

(11 The main body 23 is a cylindrical member, and the left end in FIG. 1 is connected to the tank 3. The right end in FIG. is attached to the main body part 23. Also, the main body part 23
A cylindrical guide 130 sharing an axis with the cylindrical guide 130 is disposed, and reference numeral 133 in FIG. 0 is a retainer of the guide 130.

The cover 120 consists of a reduced diameter portion 121 and a straight portion 123. 11 diameter portion 121 is the large diameter portion 131 of the guide 130
is connected to. The reduced diameter portion 121 and the guide 130 guide the nozzle 19 to a predetermined insertion trajectory. The straight portion 123 includes a protruding portion 125 that screws into the twill cap F, and the right end in the figure is folded back. Reference numeral 127 in the figure is an opening.

(2) As shown in FIG. 5, the seal portion 30 is a substantially donut-shaped member made of NBR, and is composed of a base portion 31 and a seal portion main body 33 thinner than the base portion 31.

The base portion 31 is fixed to the cylindrical portion 72 of the cam follower portion 71. The manner of fixation is that the cylindrical portion 72 and the substrate 6 of the guide portion 50
1 by force fitting between the two. Of course, with screws,
It is also possible to adopt methods such as screwing or adhesion.

Twelve ribs 35 are formed on the seal body 33 to prevent the thin seal body 33 from being disorderly deformed (rolling up, etc.).

Note that the material for forming the seal portion 30 is the seal portion main body 3.
3 in close contact with the outer peripheral surface of the nozzle 19, and the seal body 3
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 rubber such as fluororubber, and polyester.

Elastic polymer materials such as polyvinyl chloride-based thermoplastic elastomers, polyurethane-based thermoplastic elastomers, etc. can be used. It is sufficient that at least the seal portion main body 33 is formed of the above-mentioned elastic polymer material.

(3) The seal protection part 40 is a cylindrical member whose diameter gradually decreases as it goes to the left side in the figure, and the small diameter part at the left end is the nozzle 1.
It has a larger diameter than the outer peripheral surface of No.9.

Then, as shown in FIG. 2, when the seal portion 30 moves to the right, the seal portion main body 33 rides on the upper surface of the seal protection portion 40 and expands. As a result, the nozzle 19
The tip of the nozzle 19 and the seal part 35 do not interfere when the nozzle 19 is inserted into the main body part 23. Note that slits may be formed in the seal protection portion 4o from the viewpoint of weight reduction.

A flange 41 extends from the large diameter portion of the seal protection portion 40. This flange 41 is fixed by being embedded in the inner circumferential surface of the main body portion 43. The flange 41 has a through hole 43 through which the pusher 100 passes.

(4) The guide section 50 is composed of an arm section 59 and a substrate 61. The latter substrate 61 is an annular member and is fixed to the inner circumference of the cylindrical portion 72 of the cam follower portion 71. The fixing method may be a general method such as welding or screwing.Furthermore, the substrate 61 may be made into a cylinder and tightly fit into the inner circumference of the cylindrical portion 72.In this case, the substrate The left end can be extended and that part can be used as a cam follower part.

The arm portion 59 is a band-shaped member, and is formed toward the trajectory of the nozzle 19 from the substrate 61 (approximately equal to the axis of the main body portion 23). The number of lines formed was 8, and they were equally spaced. The free end of each arm portion 59 is bent. The size (diameter) of the virtual circle formed by this free end is smaller than that of the outer peripheral surface of the nozzle 19, and
Since each arm portion 59 is made of a metal material having spring elasticity, when the nozzle 19 is inserted into the main body portion 23 (FIG. 3), each arm portion 59 is a spring elastic interference fit with the outer peripheral surface of the nozzle 19. state, and the insertion trajectory of the nozzle 19 is stabilized.

Further, by maintaining the tight fit state until the nozzle 19 comes into contact with the cam portion 73, the cam follower portion 71 can be moved to the back side (auxiliary action of the moving means 70).

Note that by bending the free end of each arm portion 59, a stepped portion is formed there. Then, when the nozzle 19 is first inserted, its tip engages with the stepped portion, so that the aforementioned auxiliary action is effectively performed.

(5) The moving means 70 consists of a cam follower part 71 and a cam part flap 3.

The cam follower section 71 is provided with the cylindrical section 72 as described above.

Approximately at the center of the cylindrical portion 72 is a window 7 through which the cam portion 73 passes.
4 is drilled. Four windows 74 (each having an interval of approximately 90 degrees) are formed to match the cam portion 73. The right end of the cylindrical portion 72 is bent inward and comes into contact with the pressing portion 110 of the busher 100.

The cam portion 73 consists of a cam body 75 and a bearing 77. The cam body 75 has a substantially elliptical shape, and has a surface 75a that contacts the outer peripheral surface of the nozzle 19 and a surface 5 that contacts the cam follower portion 1.
b. The bearing 77 is an L-shaped member, and the lower part 78 in the figure rotatably receives the shaft 76 of the cam body 75. The upper part 79 in the figure is a holding member fixed to the inner periphery of the main body 23. It is fitted into 81.

Reference numeral 85 in the figure is a compression coil spring, which is hooked between the bearing 77 and the base plate 61 of the guide portion 50. As a result, the guide portion 50 is urged toward the right side in the drawing with respect to the bearing 77. (6) The stopper 87 is provided to define the dead center of the cam follower portion 71.

(7) The safety valve mechanism 90 is composed of a cylindrical member 91 and a valve portion 96.

The cylindrical member 91 includes a large diameter portion 92 and a small diameter portion 93, and is fixed to the inner peripheral surface of the main body portion 23. A plurality of axial grooves 94 and 95 are formed in the large diameter portion 92 and the small diameter portion 93, respectively. In addition, a large diameter portion 92 and a small diameter portion 93
The step portion (vertical surface) between the valve seat 90a and the valve seat 90a becomes the valve seat 90a.

The valve portion 96 consists of an annular gasket 97 and its support 98, and is pressed against the valve seat 90a by a compression coil spring 99.

As a result, sealing performance is obtained between the valve seat 90a and the gasket 97 (1st to 31ffi), L, rudder, nozzle 1
When the auto-stop, etc. in 9 malfunctions and fuel overflows, the pressure causes the valve part 96 to move to the right in the figure (see Figure 4).As a result, as shown by the arrow in Figure 4, Through the groove 95 of the small diameter portion 93 → between the valve WA90 a and the gasket 97 → the groove 94 of the large diameter portion 92,
Fuel flows backwards. Therefore, it is possible to prevent the internal pressure of the tank 3 from becoming abnormally high.

(8) The button shear 100 consists of a cap holder part 1.1 and a pressing part 110.

The cap receiver portion 101 has a structure in which a receiver pawl 105 extends from a dish-shaped base portion 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.
20 openings! It stands out from 27. 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 three in total, spaced at equal intervals. This pressing portion 110 penetrates into the through hole 43 of the flange 41 in a clearance fit manner, and its tip is brought into contact with the right end of the cylindrical portion 72 of the cam follower portion 71.

Each cap receiver 1is101 and the pressing part 110 are each a rigid body (made of metal material), and the cap receiver 1is101 is a rigid body (made of metal material).
The distance between the tip portion 107 and the tip of the pressing portion 110 is kept constant.

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 portion 23 (FIG. 1) In this state, the catch 105 of the cap receiver portion 101 at the end of the fuel cap F is pushed to the left. Therefore, the pressing part 110, which maintains a constant spacing from the cap receiver part 101, moves to the left, and accordingly, the cylindrical part 72 of the cam follower part 71 moves to the left. This results in
The seal portion 30 is separated from the seal protection portion 40. Therefore, the seal portion main body 33 is not expanded and is in an unloaded state.

This state is a general usage state of the vehicle.

At this time, the seal body 33 is under no load, so it will not be permanently deformed.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. and spring 8
5, the cylindrical portion 72 and the button shear 100 move to the right, resulting in the state shown in FIG. In this state, the seal portion main body 33 rides on the seal protection portion 4° and expands.

As a result, the seal portion 3o is removed from the opening 24 in FIG.
When viewed from the side, this is hidden deep inside the seal protection portion 4o. Therefore, the nozzle 19 is connected to the fuel injection port 21.
When inserting the nozzle 19 into the seal part 30, the tip of the nozzle 19
There will be almost no interference.

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 guide 130 and the guide part 5o. When the nozzle 19 is further inserted, the nozzle 19 contacts the face 5a of the cam body 75 and rotates it clockwise. Then, the surface flap 5b of the cam body flap 5 comes into contact with the cam follower part 71 and presses it toward the back side of the fuel injection port 21. As a result, the cam follower section 71 moves B toward the back.

When the state shown in FIG.
0, and the seal main body 33 is in continuous and close contact with the outer circumferential surface of the nozzle 19 in the circumferential direction.

This ensures sealing performance against fuel vapor.

Further, due to the presence of the cam portion 73, the cam follower portion 71 is fixed in the state shown in FIG. Therefore, as long as the nozzle 19 is inserted into the fuel injection port 21, the cam follower section 71 will remain in the state shown in FIG. I will never go back to ), which cannot be sealed against vapor.

When refueling is finished and the nozzle 19 is pulled out, the cam main body 5 rotates counterclockwise to release the pressure on the cam follower 71. Then, the seal portion main body 35 rides on the seal protection portion 40 and returns to the state shown in FIG. 2.

When the fuel cap F is reinserted into the main body 23,
The button shear 100 moves to the left in the figure and returns to the state shown in FIG. 1.

Second example FIG. 6.7 shows another embodiment of the fuel inlet 140.

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 140 of this embodiment includes a main body part 23, a seal part 141, a seal protection part 150, a guide part 160. It comprises a moving means 70, a stopper 8 and a button shear 100.

This embodiment is characterized in that the seal portion 141 is fixed and the seal protection portion 150 is movable.

The seal portion 141 is a cylindrical member made of NBR, and includes a large diameter base portion 143 and a tapered seal portion main body 145 continuous from the base portion 143.

The base portion 143 is fixed inside the inner periphery of the main body portion 23 .

The seal body 145 has an inner diameter smaller than the outer diameter of the nozzle 19 . Therefore, the nozzle 19 is
In the inserted state, the seal main body 145 comes into continuous and close contact with the outer circumferential surface of the nozzle 19 in the circumferential direction.

The seal retainer 150, the guide section 160, and the cam follower section 71 are made into one member 149. This member 149
A cross-sectional view of the same is shown in FIG. 8, and a front view thereof is shown in FIG. 9. Note that reference numeral 151 in the figure is a cylindrical portion, and its vertical wall 153 serves as a spring seat and comes into contact with the pressing portion 110 of the pusher 100. On the other hand, a window 74 is bored in the horizontal wall 155 to allow the cam portion 3 to pass through. horizontal wall 15
A cam follower portion 71 extends from the left end of 5.

The seal protection portion 150 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 . In addition, the upper surface of the seal protection portion 150 is connected to the seal portion main body 14.
5, the seal main body 145 is expanded as shown in FIG. This makes it difficult for the tip of the nozzle 19 to interfere with the seal body 145 when the nozzle 19 is inserted into the main body 23. In addition, the seal protection part 150 has ■light weight and ■guy 1 part 16.
The slit can be closed from the standpoint of ensuring zero flexibility.

The guide part 160 is a band-shaped member, and the seal protection part 150
Six lines extend from the right end of the box and are folded back inward. Furthermore, the free end of each guide portion 160 is bent outward. The inner peripheral surface of each guide portion 160 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.
Each guide portion 160 is smaller than that of the outer circumferential surface of the nozzle 19 and is made of a metal material having spring elasticity. This results in an elastic tight fit. This stabilizes the trajectory of the nozzle 19.

Note that by attaching a check valve or the like to the base 143 of the seal portion 141, a safety valve mechanism can also be provided in this embodiment.

Next, the operation of the fuel injection port 140 of this embodiment will be explained.

The state in which the fuel cap F is inserted into the main body 23 ('
(Figure s6) In this state, the catch 105 of the cap holder 101 at the end of the fuel cap F is pushed to the left. Therefore, the pressing part 110, which maintains a constant spacing from the cap receiver part 101, moves to the left, and as a result, the member 149 including the seal protection part 150 and the like moves to the left. As a result, the seal protector 150 is separated from the seal main body 145. Therefore, the seal portion main body 145 is not expanded and is in an unloaded state.

State where the fuel cap F is removed from the main body 23 (Fig. 7) When the fuel cap F is removed from the main body 23, the spring 8
A member 149 that is pressed by 5 and includes a seal protection portion 150, etc.
Then, the pusher 100 moves to the right, resulting in the state shown in FIG. In this state, the seal protector 150 expands the seal main body 145. As a result, when the seal portion 141 is viewed from the opening 24 side in FIG. 7, it is hidden deep inside the reduced diameter portion 121 of the cover 120. , the tip of the nozzle 19 hardly interferes with the seal portion 141.

When the nozzle 19 is inserted into the fuel injection port 140, the moving means 70 acts to move the cam follower portion 71 into the fuel injection port 14.
Move to the back of 0. As a result, the seal body 145
The seal protector 150 is separated from the seal main body 14.
5 is in 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 similar to the previous embodiment.

<Operations and Effects of the Invention> As explained above, according to the fuel inlet of the present invention,
The seal protection portion protects the seal portion before the nozzle is inserted 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 portion 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 cam portion of the moving means rotates following the nozzle, and the cam follower portion is moved in the nozzle insertion direction (that is, toward the back of the main body portion).

When the cam follower section moves, the seal protection section and/or the seal section connected thereto also move, and these are separated from each other. Thereby, the seal portion comes into continuous and close contact with the outer circumferential surface of the nozzle in the circumferential direction. Therefore, a sealing effect against fuel vapor during refueling is ensured.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional view of the fuel inlet 21 of the first embodiment with the fuel cap F inserted, and FIG. 2 is a half-sectional view of the fuel inlet 21 with the fuel cap F removed. 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 90 that releases overflowing fuel, and FIG. 5 is a front view of the seal portion 30. Figure 6 is a half-sectional view of the second embodiment with the fuel cap F inserted into the fuel inlet 140, and Figure 7 is a half-sectional view of the second embodiment with the fuel cap F removed from the fuel inlet 140. 8 is a cross-sectional view of the member 149, FIG. 9 is a front view thereof, FIG. 10 is a cross-sectional view of the conventional fuel injection port 1, and FIG. 11.1 is a cross-sectional view of the member 149.
FIG. 2 is a sectional view of a conventional fuel injection port 10. 1.10,21,140...fuel inlet, 14.30
, 141...Seal part, 9.19...Nozzle, 23...Body part, 40.150...Seal protection part, 70...Moving means, 1...Cam fore mouth part, 3. ...Cam part. Patent applicant: Toyoda Gosei Co., Ltd.

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 in the main body portion so as to be movable in the axial direction, and the seal protection portion or a means for moving the seal portion is a cam follower portion connected to a movable member of the seal portion or the seal protection portion. , a cam portion having a surface that contacts the outer peripheral surface of the nozzle and a surface that contacts the cam follower portion, and before the nozzle is inserted into the main body portion, the cam follower portion is provided with the seal protection. When the nozzle is inserted into the main body, the cam rotates and presses the cam follower toward the back of the main body, causing the cam follower to come into contact with the seal. A fuel injection port characterized by a configuration in which the seal portion is brought into close contact with the nozzle while being separated from the seal protection portion.