JPH075872U - Valve for fuel tank - Google Patents

Abstract

(57) [Summary] [Purpose] To simplify the structure and reduce the man-hours and costs. A tube 11 made of a rubber-like elastic material is used instead of a nipple for piping for supplying / discharging a fluid to / from a valve case, and a flange 12 provided at a base end portion thereof is provided with an inner case 13 and an outer case 14. Hold with and seal tightly. A pair of flanges may be formed on the base of the tube, and the valve case may be sandwiched by the flanges. In addition, a protrusion may be provided on the side surface of the flange or the surface holding the flange to enhance the hermeticity. Further, a reinforcing ring may be integrally formed on the inner peripheral surface or the outer peripheral surface of the base portion of the tube to increase the strength. Furthermore, in the case of a valve having a plurality of nipples for piping, a plurality of tubes may be integrally connected by a flange at the base end to further simplify the structure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a liquid inflow / outflow portion of a fuel tank valve, for example, a switching valve which is attached to a filler tube and operates at the time of refueling to shut off a flow path of fuel gas.

[0002]

[Prior art]

 FIG. 6 shows an example of such a valve, which is a valve for normally connecting a line between a fuel tank and a canister and interrupting this line during refueling to form an air chamber in the fuel tank. . In FIG. 6, reference numeral 1 denotes a valve mechanism, and a valve body 2 having a spring interposed therein can slide in a valve chamber 4 inside an inner case 3. On the side wall of the inner case 3, two vent holes 5 communicating with the inside of the valve chamber 4 are formed, which are normally opened. On the outside of the inner case 3, an outer case 7 in which a pipe nipple 6 is welded is arranged at a position facing each of the vent holes 5. A seal ring 8 is fitted around the ventilation hole 5 to seal between the inner case 3 and the outer case 7. The outer case 7 is fixed to a substrate 9 that supports the valve mechanism 1, and the substrate 9 is fixed to the filler tube.

The operation of this valve will be described. Normally, since the two vent holes 5 are not closed by the valve body 2, the fuel gas in the fuel tank connected to one of the nipples 6 is not closed. To the canister connected to the other nipple 6, and is accumulated in the canister. The canister sends the stored fuel gas to the engine along with air when the engine starts. During refueling, the shutter valve in the filler tube pushed open by the refueling gun raises the valve body 2 and closes the vent hole 5, so the line to the canister is closed and an air chamber is created between the canister and the fuel tank. It is formed to prevent over-fueling of fuel.

[0004]

In such a fuel tank valve, the conventional pipe nipple 6 is made of a metal material, and as shown in FIG. 7, the outer case 7 is burred to form an annular wall 10. It is fixed to the outer periphery of the by welding. For this reason, there is a problem that a high welding precision is required because a lot of man-hours are required and sealing performance is required. Further, when connecting to a fuel tank or a canister, another pipe is connected to the pipe nipple 6 by a joint member, so that there is a problem that it takes a lot of work steps. Furthermore, since it is necessary to seal between the inner case 3 and the outer case 7 using the seal ring 8, there is a problem that the number of parts is large and the cost is increased.

The present invention solves such a conventional problem, and an object of the present invention is to provide a fuel tank valve having a simple structure, a small number of working steps, and a cost reduction. .

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention uses a tube made of a rubber-like elastic material instead of a nipple for piping for supplying and discharging a fluid to and from a valve case, and seals the base end portion of the valve case in the valve case. It is designed to be fixed. The structure for sealing and fixing is to form a flange at the base end of the tube and sandwich this flange with a valve case, or to form a pair of flanges at the base end of the tube and then to use this pair of flanges. The valve case is clamped by. In addition, a protrusion may be provided on the side surface of the flange or the surface that holds the flange to enhance the sealing performance. Further, a reinforcing ring may be integrally formed on the inner peripheral surface or the outer peripheral surface of the base end portion of the tube to further increase the strength. Furthermore, in the case of a valve having a plurality of pipe nipples, the structure may be simplified by integrally connecting a plurality of tubes with a flange at the base end thereof.

[0007]

[Action]

 According to the present invention, the structure described above simplifies the structure of the fluid inflow / outflow portion, reduces the work man-hours for welding and connection with the mating member, and since there is no need for a seal ring, the number of parts can be reduced and the cost is low. It is possible to provide a valve for a fuel tank.

[0008]

【Example】

 FIG. 1 shows a first embodiment of the present invention. The tube 11 made of a rubber-like elastic material has a tip end portion connected to a mating member, and a flange 12 at the base end portion thereof is hermetically fixed to the valve case. The valve case is composed of an inner case 13 that accommodates the valve mechanism and an outer case 14 that covers the outside thereof. The inner case 13 is formed with a vent hole 15 that communicates with the valve chamber in which the valve element slides. . The flange 12 at the base end of the tube 11 is sandwiched between the inner case 13 and the outer case 14 so as to face the vent hole 15 and is hermetically fixed. Reference numeral 16 is a reinforcing ring integrally embedded from the outer peripheral surface of the base end portion of the tube 11 to a part of the side surface of the flange 12, and 17 is a tube insertion hole provided in the outer case 14.

The tube 11 is passed through the tube insertion hole 17 of the outer case 14 from the tip end side, and is fitted into the tube insertion hole 17 at the reinforcing ring 16. In this state, the inner case 13 is incorporated in the outer case 14, and the flange 12 is compressed between the inner case 13 and the outer case 14 and hermetically fixed. In this embodiment, an inexpensive fuel tank valve having a simple structure and a small number of assembling steps can be realized.

FIG. 2 shows a second embodiment of the present invention. The tube 21 made of a rubber-like elastic material has a tip end portion connected to a mating member, and a flange 22 at the base end portion thereof is hermetically fixed to the valve case. The valve case is composed of an inner case 23 accommodating a valve mechanism and an outer case 24 covering the outer side thereof. The inner case 23 is formed with a vent hole 25 communicating with the valve chamber in which the valve element slides. . A reinforcing ring 26 is integrally embedded in the inner peripheral surface of the proximal end portion of the tube 21 so as to face the vent hole 25 so as to partially cover the side surface of the flange 22. Annular protrusions 28 are formed on both surfaces of the flange 22.

The tube 21 passes through the tube insertion hole 27 of the outer case 24 from the tip end side, and is fitted into the tube insertion hole 27 at the base end portion. In this state, the inner case 23 is incorporated in the outer case 24, and the flange 22 is compressed between the inner case 23 and the outer case 24 and hermetically fixed. In this embodiment, since the annular projections 28 are provided on both surfaces of the flange 22, there is an advantage that the sealing performance is further improved. Such an annular protrusion has the same effect when it is provided on the inner case 23 and the outer case 24.

FIG. 3 shows a third embodiment of the present invention. A tube 31 made of a rubber-like elastic material has a tip end portion connected to a mating member, and a flange 32 at the base end portion thereof is hermetically fixed to a valve case 33 by a screw type snap ring 34. The valve case 33 is formed with a vent hole 35 communicating with the valve chamber in which the valve body slides, and a flange hole 36 that accommodates the flange 32 continuously from the vent hole 35. The vent hole 35 is formed on the inner peripheral surface of the flange hole 36. A groove 37 is formed.

In the tube 31, the flange 32 at the base end portion is inserted into the flange hole 36 of the valve case 33, and the screw type snap ring 34 is screwed into the groove 37 on the inner peripheral surface of the flange hole 36 from above. As a result, the flange 32 is compressed between the snap ring 34 and the bottom surface of the flange hole 36, and hermetically fixed. In this embodiment, since the flange 32 is pressed by using the screw type retaining ring 34, there is an advantage that the sealing performance is further improved.

FIG. 4 shows a fourth embodiment of the present invention. The tube 41 made of a rubber-like elastic material has its tip end portion connected to a mating member, and its base end portion inserted into the tube insertion hole 45 formed in the valve case 44 and formed at the base end portion. A pair of flanges 42, 43 sandwich and hold the valve case 44 and are hermetically fixed. A reinforcing ring 46 is integrally embedded in the inner peripheral surface of the base end portion of the tube 41. In this embodiment, since the base end portion of the tube 41 is sealed and fixed only by inserting it into the tube insertion hole 45 of the valve case 44, there is an advantage that the structure is further simplified.

FIG. 5 shows a fifth embodiment of the present invention. When there are two piping nipples like the conventional valve shown in FIG. 6, instead of these two nipples, the tubes 51 and 52 are integrally connected by a rubber 53 with a rubber-like elastic material. And molded. The base end portions of the tubes 51 and 52 are formed in a bellows shape, and the reinforcing rings 54 and 55 are integrally formed on the outer peripheral surface of the base end portion so as to partially cover the side surfaces of the flange 53. The valve case is divided into an inner case 56 and an outer case 57, and the inner case 56 is provided with vent holes 58 and 59 communicating with the valve chamber.

The tubes 51 and 52 are passed through the tube insertion holes 60 and 61 of the outer case 57 from the tip end side thereof, and are fitted into the tube insertion holes 60 and 61 at the reinforcing rings 54 and 55. In this state, the inner case 56 is incorporated in the outer case 57, and the flange 53 is compressed between the inner case 56 and the outer case 57 and hermetically fixed. In this embodiment, the plurality of tubes 51, 52 are integrally connected by the flange 53 at their base end portions, so that there is an advantage that the structure is further simplified.

[0017]

[Effect of device]

 As described above, according to the present invention, a tube made of a rubber-like elastic material is used in place of the pipe nipple for supplying / discharging the fluid to / from the valve case, and its proximal end portion is hermetically fixed to the valve case. The structure for sealing and fixing is that the flange is formed at the base of the tube and the flange is clamped by the valve case, or a pair of flanges is formed at the base of the tube. By sandwiching the valve case with a pair of flanges, the structure of the fluid inflow and outflow parts is simplified, the work man-hours for welding and connection can be reduced, and the number of parts can be reduced because no seal ring is required, and it is inexpensive. A fuel tank valve can be provided.

Further, according to the present invention, by providing the protrusion on the side surface of the flange or the surface holding the flange, the sealing performance can be further enhanced. Further, the strength can be further increased by integrally forming the reinforcing ring on the inner peripheral surface or the outer peripheral surface of the base portion of the tube. Furthermore, in the case of a valve having a plurality of piping nipples, the structure can be further simplified by integrally forming a plurality of tubes with a flange at the base end.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part showing a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of essential parts showing a third embodiment of the present invention.

FIG. 4 is a cross-sectional view of a main part showing a fourth embodiment of the present invention.

FIG. 5 is a cross-sectional view of essential parts showing a fifth embodiment of the present invention.

FIG. 6A is a plan view showing an example of a conventional fuel tank valve. (B) A sectional view showing an example of a conventional fuel tank valve.

FIG. 7 is a cross-sectional view of essential parts showing a nipple portion for piping of a conventional fuel tank valve.

[Explanation of symbols]

 11 Tube 12 Flange 13 Inner Case 14 Outer Case 15 Vent Hole 16 Reinforcement Ring 17 Tube Insertion Hole 21 Tube 22 Flange 23 Inner Case 24 Outer Case 25 Vent Hole 26 Reinforcement Ring 27 Tube Insertion Hole 31 Tube 32 Flange 33 Valve Case 34 Snap Ring 35 Vent hole 36 Flange hole 37 Screw groove 41 Tube 42, 43 Flange 44 Valve case 45 Tube insertion hole 46 Reinforcement ring 51, 52 Tube 53 Flange 54, 55 Reinforcement ring 56 Inner case 57 Outer case 58, 59 Vent hole 60, 61 Tube insertion hole

Claims (6)

[Scope of utility model registration request] 1. In a fuel tank valve for controlling the inflow and outflow of a fluid by a valve mechanism inside a valve case, a tube made of a rubber-like elastic material instead of a nipple for piping for supplying and discharging the fluid to and from the valve case. A fuel tank valve whose base end is sealed and fixed to the valve case. 2. The valve for a fuel tank according to claim 1, wherein a flange is formed at the base end portion of the tube, and the flange is sandwiched between the valve cases. 3. The fuel tank valve according to claim 1, wherein a pair of flanges are formed at the base end portion of the tube, and the valve case is sandwiched by the pair of flanges. 4. The valve for a fuel tank according to claim 2, wherein a projection is provided on a side surface of the flange or a surface holding the flange. 5. The valve for a fuel tank according to claim 1, wherein a reinforcing ring is integrally formed on the inner peripheral surface or the outer peripheral surface of the base end portion of the tube. 6. The valve for a fuel tank according to claim 1, wherein a plurality of tubes are integrally connected by a flange at a base end thereof.