JP2514397Y2 - Fuel tank filler tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a filler tube for refueling a fuel tank of a vehicle or the like.

(Prior Art) A conventional filler tube for refueling a fuel tank of a vehicle is a fuel tank T as shown in FIGS. 3 and 4.
The first passage 1 is connected to a liquid level sensing valve V1 disposed in the upper space of the fuel tank T by a first passage 1, and the second passage is provided on the upper side. The vent cut valve 2 connected to the carbon canister C by l2 is provided and the vent cut valve 2 is provided.
A thicker portion 3 formed by eccentrically forming the support hole 3a of the oil supply nozzle n is provided in the filler tube 1 adjacent to the upper end side, and a T-shaped valve body is provided in the case 2a of the vent cut valve 2. 2b is accommodated in a state in which the rod portion penetrates the through hole 1a formed in the filler tube 1, and is normally biased by the spring 2c and the diaphragm 2d toward the tube side to close the outlet end of the through hole 1a. . On the other hand, on the lower side (on the left side in FIG. 4) of the thick portion 3, the valve body 4 is rotatably supported by an arm 4a protruding on the inside (on the lower side in FIG. 4) of the on-off valve 2. Is normally urged toward the thick portion 3 side by a spring 4b wound around the shaft rod to close the lower end opening of the support hole 3a, and
The thick portion 3 is provided with a relief passage 3b having a relief valve 5 that is spring-biased so that it opens when the pressure in the fuel tank T rises sharply during refueling. It is screwed and airtightly attached.

Then, at the time of refueling, the cap 6 is removed, the refueling nozzle n is inserted from the upper end, and the tip end is provided with the support hole 3a of the thick portion 3.
The valve body 4 is opened while air-tightly fitting it through the packing 7, the valve body 4 is lifted by the valve body 4, and fuel is supplied in that state. At that time, the fuel vapor generated in the fuel tank T is , Khan canister C via second passage 1, l2
I am sending it to.

On the other hand, the fuel vapor generated in the fuel tank T when the vehicle is stopped or traveling is equipped with a check valve V2 and a two-way valve V3 that maintain a constant pressure (slightly higher than atmospheric pressure) in the fuel tank T on the way. It is arranged to be placed on the carbon canister C by the passage l3.

(Problems to be solved by the invention) However, such a conventional filler tube has a structure in which the valve body moved by the fueling nozzle comes into contact with the valve body, and the valve body surface is pushed up while the end portion of the valve body slides. Therefore, when the refueling nozzle is inserted at the time of refueling, for example, when the refueling nozzle hits the support hole and opens the valve body only a little, the valve body and the valve body are only slightly touched, and the gap between the diaphragm and the valve seat is small, and Rather than flowing the steam through the first passage and the second passage, the steam is released into the atmosphere from the support holes and pollutes the atmosphere. Further, if the oil supply nozzle is strongly inserted into the support hole, the valve body pushes the valve body strongly in the oblique lateral direction rather than the vertical direction, which causes a problem that the valve body is bent or damaged.

(Means for Solving the Problem) A liquid level sensing valve is disposed in an upper space of a fuel tank provided with a filler tube, and the liquid level sensing valve and the carbon canister are provided with first and second passages through a vent cut valve. In the filler tube in the fuel tank connected by, the connecting portion between the vent tube connected to the liquid level detection valve and the tube connected to the carbon canister, the rod extending into the filler tube is fixed to one side of the diaphragm. A vent cut valve that connects and disconnects the vent tube and the tube according to the vertical movement of the rod is provided, and a thick portion having a support hole is provided in the filler tube near the rod and a seal is provided on one surface in contact with the thick portion. A ring and a mounting member to which the pedestal is fixed are provided, a shaft is inserted through the pedestal, and a valve portion is fixedly installed on the lower edge of the shaft. A valve body including an arm portion is attached, a shaft is provided in the arm portion in parallel with the axis, and a lower end of a rod is pivotally attached to the shaft.

(Operation) When the oil supply nozzle is inserted into the support hole in the filler tube, the valve part is pushed open, and the arm part connected to this rotates in the same direction around the axis, and the arm part is not pushed diagonally or pushed. While the end portion of the rod slides on the shaft peripheral surface, the shaft and the rod convert the rotational movement into a linear motion, and immediately the rod rises, so that the vent tube and the tube are in rapid communication. The fuel vapor generated during refueling flows from the fuel tank through the vent cut valve and is sent to the carbon canister. When the fuel is supplied to the fuel tank to a predetermined level, the liquid level sensing valve closes and the liquid level stops rising.

(Embodiment) FIGS. 1 and 2 show an embodiment of the filler tube of the present invention, which is obliquely installed in one side of the fuel tank T in a penetrating state. The filler tube 11 has a vent cut valve.
Ten are provided. The vent cut valve 10 communicates with the liquid level sensing valve V1 held in the upper space of the fuel tank T by the first passage 1 and is connected to the carbon canister C by the second passage l2. The vent cut valve 10 is provided between a vent tube 12 communicating with the first passage 1 and a tube 13 communicating with the second passage 12. The vent cut valve 10 includes an annular partition wall 15 provided on a bottom wall of a connecting portion between the tubes 12 and 13, a valve chamber 40 formed above the partition wall 15 and an atmosphere chamber 40a and a steam chamber 40b. A diaphragm (17) for partitioning is provided, and a rod (18) is fixedly mounted on one surface of the diaphragm (17) with one end being clamped by a stopper. The inner and outer sides of the partition wall 15 form a first cell 14 and a second cell 16. A through hole 19 is formed in the center of the first cell 14, and the through hole is open to the inside of the filler tube 11. The rod 18 of the vent cut valve 10 is inserted into the through hole 19 and extends into the filler tube 11. Reference numeral 41 is a bellows that expands and contracts in accordance with the vertical movement of the rod 18, and is arranged with one end passing through the periphery of the through hole 19 and the other end passing over the rod 18. A spring 20 that presses the diaphragm 17 downward is provided in the atmosphere chamber 40a of the valve chamber 40 via the stopper. The lower surface of the diaphragm 17 is usually seated on the end of the partition wall 15, that is, on the upper wall, and they form a so-called valve body and valve seat, and connect and disconnect the vent tube 12 and the tube 13.

In the vicinity of the rod 18 in the filler tube 11, a thick portion 22 having a support hole 21 and a mounting member 24 in contact with the thick portion
Is provided. The mounting member 24 has a seal ring 23 on one side.
Is fixed, and the pedestal 24a is fixed above it. Pedestal 24a
A shaft 28 is passed through the arm 28 and an arm portion 26 and a spring 29 are attached to the shaft. A valve portion 25 is fixed to a lower edge of the arm portion 26, and a shaft 30 is provided upright in parallel with a shaft 28. Spring 29
One end thereof presses the mounting member 24 toward the pedestal 24a side, and the other presses the valve portion 25 toward the seal ring 23 side. Normally, the valve portion 25 is in close contact with the surface of the seal ring 23 and closes the support hole 21. Arm 26 and valve 25 are valve bodies
Formed 27 and mounted for pivotal movement about an axis 28. The arm portion 26 and the valve portion 25 are arranged substantially at right angles, and the shaft 30 of the arm portion 26 and the bet-cut valve are arranged.
The tips of 10 rods 18 are pivotally attached by snap fittings.

An opening 24b is provided near the pedestal 24a of the mounting member 24, and the opening is closed by a valve of the relief valve 31. The relief valve 31 opens the opening 24b when the vapor pressure in the filler tube 11 rises to an abnormal pressure value.

In the vent cut valve 10, the tip of the rod 18 is usually at the lowermost position, the diaphragm 17 is in contact with the upper wall of the partition wall 15, and the vent tube 12 and the tube 13 are blocked by the diaphragm 17. Further, the valve portion 25 is in close contact with the surface of the seal ring 23, and the support hole of the filler tube 11 is
21 is blocked.

When the refueling nozzle n is inserted into the filler tube 11, the valve portion 25 of the valve body 27 is pushed open to the left, and at the same time, the arm portion 26 is rotated and the shaft 30 and the rod 18 pivotally attached to the shaft 18 are rotated. The rod around the shaft 30 by
While the 18 end slides, the rotary motion of the arm part 26 is changed to a linear motion to push up the rod 18 and the diaphragm 17 is separated.
15 away from the top wall, vent tube 12 and tube 13
And communicate with. As a result, the fuel vapor generated when the fuel from the refueling nozzle n is filled in the fuel tank T is
Carbon canister C flowing through passage 1 and second passage 12
Will be promptly introduced. When the liquid level reaches the liquid level detection valve V1 by refueling, the fuel supply is stopped.

(Effects of the Invention) With the above configuration, according to the present invention, the arm portion rotates with the rotation of the valve portion to immediately move the rod upward, and the vent tube communicates with the tube. The fuel vapor is not released from the filler tube into the atmosphere. In addition, the shaft that supports the valve body, the arm and shaft of the valve body form a so-called crank mechanism, and the excessive force due to the rotation of the valve body can prevent the rod from bending and damaging regardless of the rod, and the function of the vent valve. Can be maintained.

[Brief description of drawings]

1 is a partially broken plan view of an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, FIG. 3 is an overall view of a fuel vapor apparatus, and FIG. 4 is conventional. 3 is a cross-sectional view of the upper portion of the filler tube of FIG. 10 …… Vent cut valve, 11 …… Filler tube 15 …… Partition wall, 17 …… Diaphragm 18 …… Rod, 21 …… Support hole 23 …… Seal ring, 24 …… Mounting member 26 …… Arm part, 27… … Valve body 28 …… Axis, 30 …… Shaft

Claims (1)

(57) [Scope of utility model registration request] 1. A liquid level sensing valve is disposed in an upper space of a fuel tank provided with a filler tube, and the liquid level sensing valve and a carbon canister are connected by a first and a second passage via a vent cut valve. In the filler tube of the fuel tank, a rod extending into the filler tube is fixed on one side of the diaphragm at the joint between the vent tube connected to the liquid level sensing valve and the tube connected to the carbon canister. A vent cut valve that connects and disconnects the vent tube and the tube according to the movement is provided, and in the filler tube near the rod, a thick portion having a support hole and a seal ring and a pedestal are in contact with the thick portion on one surface. A fixed mounting member is provided, and a shaft is inserted into the pedestal, and the shaft is composed of an arm portion in which a valve portion is fixedly mounted on a lower edge. Lube body is attached, the filler tube in the fuel tank is pivotally mounted to the lower end of the rod to the shaft arranged shaft parallel to the axis to the arm portion.