JPH0510059U - Installation structure of evaporation valve to fuel tank - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a structure in which a vaporization valve can be attached to any fuel tank made of steel or resin without using a screw member. [Structure] The flange of the evaporation valve is placed on the flange of the fuel tank at the upper end of the cylindrical wall rising up from the opening of the upper wall of the fuel tank, and the evaporation valve is hung in the fuel tank. From above, an annular body composed of a tubular portion and a flange portion formed toward the inner side of the upper end of the tubular portion is covered, and the annular tubular portion is circumferentially arranged along the lower edge of the fuel tank flange portion. A plurality of tubular portions below the slit are swaged inward.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 According to the present invention, the fuel vapor generated in the fuel tank of an automobile is arranged in the fuel vapor passage leading to the canister that adsorbs the fuel vapor so that liquid fuel in the fuel tank can be removed when the vehicle leans, turns, or falls abnormally. The present invention relates to a vaporization valve (which is also referred to as vaporized gas system valves in detail) for preventing the vaporization from flowing into the canister, which is attached to the upper wall of the fuel tank but is attached to the fuel tank.

[0002]

[Prior art]

 Since the fuel tank of a conventional automobile is made of steel plate and the screw holes are easily formed, the evaporation valve is attached to the fuel tank by attaching the collar portion b formed on the evaporation valve casing a to the fuel tank as shown in FIG. It was performed by fixing to the upper wall body c by the screw member d. Although not shown in the figure, a packing is held between the collar portion b and the upper wall c of the fuel tank.

In the above configuration, there is not only an uneasy factor such as fuel leakage due to loosening of the screw member, but recently, there is a tendency to resin-mold a fuel tank to reduce vehicle weight. Since it is not appropriate to attach the evaporation valve with a screw member, a structure is required to attach the evaporation valve to the fuel tank without depending on the screw member.

[0004]

[Problems to be solved by the device]

 It is an object of the present invention to obtain a structure in which the evaporation valve is attached to the upper wall of the fuel tank without using a screw member.

[0005]

[Means for Solving the Problems]

 With the structure described below, the evaporation valve can be attached to a steel plate fuel tank and a resin-molded fuel tank without using a screw member.

That is, a cylindrical wall is raised along the periphery of the opening of the upper wall of the fuel tank to which the evaporation valve is attached, and a flange on the fuel tank side is provided on the outer periphery of the upper end of the cylindrical wall. The evaporation valve side flange is formed on the outer circumference of the evaporation valve housing to have a diameter substantially the same as that of the flange, and the flange is placed on the fuel tank side flange, and the evaporation valve side flange is formed. And a flange portion that is loosely fitted around the outer periphery of the fuel tank side flange portion and a flange portion that is formed inward at the upper end of the tubular portion, and the flange portion lower surface that faces the inside of the tubular portion. A plurality of arc-shaped slits at intervals in the circumferential direction at a position approximately equal to the total thickness of the evaporative valve side flange portion and the fuel tank side flange portion. After arranging the formed ring body from the upper surface side of the evaporative valve side flange portion, below the slit of the tubular portion of the ring body. The configuration in which the side portion is projected inside the inner peripheral surface of the tubular portion by crimping.

[0007]

[Action]

 The flange of the fuel tank and the flange on the side of the evaporation valve are connected to the flange facing inward of the annulus and the cylindrical lower part of the annular part of the annular part below the slit formed in an arc shape at a circumferential interval. By the tightening, the evaporation valve is held between the inner peripheral surface of the tubular portion and the portion protruding inward, and the evaporation valve is kept at the position where it is attached to the fuel tank. An O-ring groove is provided on the outer circumference of the evaporation valve casing below the flange on the evaporation valve side, and an O-ring is arranged between the evaporation valve casing and the inner peripheral surface of the cylindrical wall standing on the upper wall of the fuel tank. Or keep the O-ring on either the bottom of the evaporation valve side flange or the top of the fuel tank side flange, and place the O ring on the bottom of the evaporation valve side flange and the fuel tank side flange. It is possible to prevent fuel leakage from the fuel tank by maintaining the airtightness between the fuel tank and the fuel tank.

[0008]

【Example】

 FIG. 1 is a longitudinal sectional view showing a first embodiment of a structure for mounting a vaporization valve to a fuel tank according to the present invention. Reference numeral 1 is a vaporization valve housing, 2 is an upper wall of a fuel tank, and 3 is a fuel tank. A cylindrical wall body that rises along the peripheral edge of the opening of the upper wall body 2. A fuel tank side flange 4 is formed at the upper end of the cylindrical wall body 3. Reference numeral 5 denotes a transpiration valve-side collar portion formed on the outer periphery of the transpiration valve housing 1, 6 denotes a ring-shaped tubular portion 7, and an inward-facing collar portion formed at an upper end portion of the tubular portion 7. After the annular body 6 is arranged from the upper surface side of the evaporation valve side flange portion 5, a tubular portion 9 below a slit formed in the tubular portion 7 which will be described later is caulked to project inward. Let An O-ring groove is provided on the outer peripheral surface of the evaporation valve housing 1 below the collar portion 4, and an O-ring 10 is arranged, and an inner peripheral surface of a cylindrical wall body 3 that is raised on the fuel tank upper wall body 2. The airtightness is formed between the vaporization valve and the casing 1 of the evaporation valve to prevent fuel leakage. Other symbols in FIG. 1 will be described later.

FIG. 2 is a perspective view of the ring body 6 used in the embodiment of FIG. 1, and the same reference numerals as those in FIG. 1 denote the same parts, and 11 denotes a slit, which is the ring body 6. Downward from the lower surface of the collar portion 8 of the tubular portion 7 at a position of a distance 1 which is substantially equal to the total of the thickness of the collar portion 5 on the evaporation valve side and the thickness of the collar portion 4 on the fuel tank side. Are formed in an arc shape at intervals in the circumferential direction. The embodiment shown in FIGS. 1 and 2 shows an example in which one slit 12 is provided below the slit 11 in parallel with the slit 11. If two slits are provided in parallel and the portion 9 between the two slits 11 and 12 is made to protrude inward by crimping, the man-hour will increase, but there will be abnormalities in the portion not crimped. Crimping can be performed without deformation.

FIG. 3 is a perspective view of the evaporation valve attached to the fuel tank by the attachment structure of the embodiment shown in FIG. 1 as seen from above the fuel tank, and FIG. 4 is a view between the two slits 11 and 12. It is the figure which looked at the above-mentioned ring object 6 simple substance after caulking part 9, and the numerals in Drawing 3 and Drawing 4 show the same portion as the numerals in Drawing 1.

FIG. 5 shows a first structure of the evaporation valve in which an O-ring 10 for preventing fuel leakage between the fuel tank and the evaporation valve is arranged in an O-ring groove provided on the lower surface of the flange 5 on the evaporation valve side. The second embodiment is exactly the same as the first embodiment except that the mounting position of the O-ring 10 is different, and the reference numerals in the drawing indicate the same parts as those in FIG.

Although the present invention is not intended for the structure of the evaporation valve, the outline of the structure of the evaporation valve shown in FIGS. 1 and 5 is as follows: 13 is an inflow passage for the fuel vapor generated in the fuel tank. , 14 are connected to the canisters by the fuel vapor outflow passages. When the liquid fuel in the fuel tank flows into the casing 1 of the evaporation valve from the fuel vapor inflow passage 13 due to an abnormal tilt or turn of the vehicle, the floating body 15 floats up, and when the vehicle falls, the sphere body 16 Moves upward in the figure along the funnel-shaped slope 17 and pushes up the floating body 15, and thus pushes up the valve body 19 via the auxiliary valve body 18 formed integrally with the floating body 15. The fuel vapor passage 20 is closed to prevent the liquid fuel from flowing into the canister, the condition that the liquid fuel flows into the evaporation valve casing 1 disappears, and the fuel passes through the fuel vapor inflow passage 13 to the fuel tank. When the floating body 15 descends together with the auxiliary valve body 18, the through hole 19-1 in the center of the valve body 19 is conducted, and even if the pressure in the fuel tank is higher than atmospheric pressure, the fuel vapor is Or air flows out from the through hole 19-1 When the pressure in the material tank decreases and the pressure difference between the upstream and downstream sides of the valve body 19 disappears or decreases, and the floating body 15 descends, the floating body 15 and the valve body 19 engage and the valve body 19 is pulled down. Thus, the conduction of the fuel vapor passage 20 is surely restored. The vaporization valve shown in FIGS. 1 and 5 is formed integrally with a two-way valve. When the pressure in the fuel tank rises due to temperature rise, fuel vapor or air passes through the fuel vapor inflow passage 13 and the fuel vapor passage 20, The two-way valve 22 is pushed up and separated against the bias of the spring 21 to open the valve, flows into the canister through the fuel vapor outflow passage 14, and the temperature in the fuel tank causes the pressure to rise below atmospheric pressure. When the temperature becomes lower, the two-way valve 22 is seated by the biasing force of the spring 21, and the atmosphere slowly enters the fuel tank through the canister, the fuel vapor outflow passage 14, and the small hole 23 in the center of the two-way valve 22. When it flows in, the pressure in the fuel tank is restored to atmospheric pressure.

[0013]

[Effect of the device]

 The structure for mounting the evaporation valve to the fuel tank of the present invention can be applied regardless of whether the fuel tank is made of steel or resin, and since the screw member for mounting is not used, the screw member is loose. There is no risk that the evaporation valve will fall out of the fuel tank or fuel will leak, and the number of parts and the number of work steps can be reduced because no screw member is used.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of the present invention.

FIG. 2 is a perspective view of an annulus used for attaching the evaporation valve.

FIG. 3 is a perspective view of the evaporation valve after being installed according to the present invention.

[Fig. 4] View from below of the ring body with the evaporation valve attached.

FIG. 5 is a second embodiment of the present invention.

FIG. 6 is a perspective view showing a conventional structure example in which a vaporization valve is attached to a steel fuel tank.

[Explanation of symbols]

 1 Evaporation Valve Housing 2 Fuel Tank Upper Wall 3 Cylindrical Wall 4 Fuel Tank Side Collar 5 Evaporation Valve Side Collar 6 Annular Body 7 Annular Cylindrical Part 8 Inner Collar 9 Slit Lower cylindrical part 10 O-ring 11 Slit 12 Slit 13 Fuel vapor inflow passage 14 Fuel vapor outflow passage 15 Float body 19 Valve body 22 Two-way valve

Claims (1)

[Claims for utility model registration] [Claim 1] An abnormal inclination, turning or overturning of a vehicle is provided by disposing fuel vapor generated in a fuel tank of an automobile in a fuel vapor passage leading to a canister that adsorbs the fuel vapor. Sometimes
A vaporization valve for preventing liquid fuel in a fuel tank from flowing into the canister, wherein the vaporization valve is attached to the upper wall of the fuel tank, the upper wall (2) of the fuel tank to which the vaporization valve is attached. ) A cylindrical wall body (3) is raised along the peripheral edge of the opening to form the cylindrical wall body (3).
A fuel tank side flange (4) is formed on the outer periphery of the upper end of the evaporation valve, and the evaporation valve side flange (5) is formed on the outer periphery of the evaporation valve casing (1) to have a diameter substantially the same as that of the flange (4). Forming the collar part (5)
Is placed on the fuel tank side flange portion (4), and a tubular portion (7) loosely fitted around the evaporation valve side flange portion (5) and the fuel tank side flange portion (4) is provided. And a flange portion (8) formed inward at the upper end of the tubular portion (7). The flange portion (8) is directed downward from the lower surface of the tubular portion (7). A plurality of arc-shaped slits (11) are formed at intervals in the circumferential direction at a position substantially equal to the total thickness of the evaporation valve side flange (5) and the fuel tank side flange (4). After disposing the formed ring body (6) from the upper surface side of the evaporation valve side flange portion (5), the ring body (6) is formed.
A structure for attaching a vaporization valve to a fuel tank, in which the lower portion of the slit (11) of the tubular portion (7) is protruded by caulking inside the inner peripheral surface of the tubular portion (7).