JPH0443375Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a valve device for sending fuel vapor accumulated in the fuel tank and injection pipe of an engine to the carbon canister side.

(Conventional technology) In recent vehicles, the third
As shown in the figure, a valve device V is provided at the inlet end of the injection pipe 1 of the fuel tank T, and this is connected to the carbon canister C by a pipeline l, so that the fuel filling the tank when refueling is carried out. The steam is not released to the outside, but is adsorbed and held in a carbon canister C for steam control, and is fed into the intake manifold at any time.

The valve device V provided at the inlet end of the injection tube 1 is as shown in FIG. A valve box 2 having an outlet pipe 2a on the top is installed perpendicularly to the injection pipe 1, and a poppet valve 3 is accommodated in the valve box 2 by inserting a stem 3a of a required length into the injection pipe 1. is,
A coil spring 4 is stretched between the valve head and the upper wall of the valve box, and the spring force urges the poppet valve 3 toward the injection pipe 1. Normally, the tapered surface on the lower side of the valve head touches the valve seat. is in pressure contact with the hole 1a, thereby closing the through hole 1a. On the other hand, a pair of brackets 6 are attached to the circumferential surface of the funnel-shaped nozzle guide 5 on the through hole 1a side, which is fixed on the inlet side of the valve box 2 in the injection pipe 1, and a lid plate is inserted between the brackets 6. The upper end of the guide 5 is rotatably supported by a pivot, and a spring on the pivot shaft normally closes the inner opening of the guide 5 to prevent foreign matter from entering from the outside and to allow fuel vapor in the injection pipe 1 to exit to the outside. It is made so that there is no such thing.

Then, when refueling the fuel tank T, a refueling nozzle n is inserted into the injection pipe 1 via the guide 5, and the cover plate 7 is rotated outward by the nozzle n.
By rotating the poppet valve 3 to the outside and opening the hole 1a, the fuel vapor filling the tank T and the injection pipe 1 is transferred to the hole 1a.
It flows out from the valve box 2 to the carbon canister C side through the.

(Problem to be solved by the invention) By the way, in the conventional valve device described above, the valve system 3a and the cover plate 7 in the closed state are almost parallel, and the opening operation of the cover plate 7 is immediately transmitted to the valve stem 3a. If the stem 3a is lengthened so that it is behind the cover plate 7, the cover plate 7 will not open, but when the cover plate 7 rotates approximately 90 degrees as shown in the figure, it contacts the valve stem 3a, and the spring 4 reverses this. The valve 3 tilts and moves upward, which causes waste in the movement of the cover plate 7, and the force acting on the cover plate 7 is not along the axis of the valve stem 3a, causing the valve 3 to tilt and open. There is a problem that it does not work smoothly.

Therefore, the present invention provides a valve device in which there is no waste in the rotating operation of the cover plate in the injection tube, and in which the opening operation can be performed smoothly without fear of the valve tilting.

(Means and effects for solving the problems) Based on the above object, this invention provides a valve device for the injection pipe of a fuel tank by providing a through hole in the side wall of the inlet end of the injection pipe of the fuel tank. On the side wall near the hole is a rotatable plate valve that opens and closes the through hole, and on the side wall is a valve equipped with an outlet pipe that surrounds the plate valve and communicates with the carbon canister via a pipeline. The box is attached, and the nozzle guide provided inside the injection tube is provided with a cover plate which is rotatably provided with a spring biased to close the inner opening of the nozzle guide, and a cover plate is provided on the back side of the cover plate in the direction of rotation. The feature is that a curved push rod is attached, and the tip of the push rod is brought close to the bottom surface of the plate-shaped valve.When refilling fuel, if the refueling nozzle is inserted into the injection pipe through the valve guide, the nozzle guide The cover plate is rotated outward by the nozzle tip, and as soon as the cover plate begins to rotate, the push rod pushes up the plate valve, opening a hole and draining the fuel tank and injection pipe. The fuel vapor flows through the valve box and toward the carbon canister.

On the other hand, when the refueling nozzle is pulled out from the injection pipe, the cover plate closes to the inner opening of the nozzle guide, and at the same time, the plate-shaped valve closes the through hole of the injection pipe.

(Embodiment) An embodiment of this invention will be described with reference to FIGS. 1 and 2. Reference numeral 11 is an injection pipe of a fuel tank, and a through hole 11a of a required size is formed in the side wall of the inlet end of the injection pipe. A plate-shaped valve 13 is provided on the outside of the through hole 11a and has an annular conical portion 13a on its lower surface for opening and closing it, and its base end is located adjacent to the through hole 11a on the side wall of the tube. It is rotatably attached to a pair of left and right brackets 14 via a pin shaft 14a, and is normally configured to close the through hole 11a by a coil spring 18a disposed on the pin shaft 14a. A valve box 12 having an outlet pipe 12a is attached to the side wall of the injection pipe 11 so as to surround the above-mentioned plate-shaped valve 13, and the outlet pipe 12a is connected to the carbon canister by a pipeline l.

On the other hand, a funnel-shaped nozzle guide 15 is fixed within the inlet end of the injection pipe 11 so as to be slightly shifted toward the inlet end than the plate valve 13 .
A pair of left and right brackets 16 tilted toward the through hole are attached to the circumferential surface of the through hole 11a side, a pin shaft 16a is installed between the brackets 16, and the base of the cover plate 17 is attached to the pin shaft 16a. It is rotatably supported (this may be done by attaching the base of the cover plate 17 to the pin shaft 16a and supporting it so that the pin shaft 16a rotates), and usually a coil spring provided on the pin shaft 16a. The cover plate 17 is biased counterclockwise by the cover plate 18b to close the inner opening of the nozzle guide 15.
A push rod 17a is attached which is curved in the direction of rotation of the guide 15, and its tip enters the through hole 11a and approaches the lower surface of the plate-shaped valve 13 when the inner opening of the guide 15 is closed, that is, when the valve is closed.

Therefore, when refilling the fuel tank,
When the refueling nozzle n is inserted into the injection pipe 11 through the nozzle guide 15, the cover plate 17 closes the inner opening of the guide with the tip of the nozzle n as usual.
is pushed open and rotated toward the through hole 11a, but at that time, the push rod 17 attached to the back of the cover plate 17
The tip of a immediately hits the lower surface of the plate-shaped valve 13, which is rotated outward as shown by the solid line in Figure 1, opening the through hole 11a of the injection tube 11.
The fuel vapor accumulated in the fuel tank and the injection pipe 11 passes through the through hole 11a and flows out to the carbon canister side via the outlet pipe 12a and the pipeline l.

Further, when the refueling nozzle n is pulled out from the injection pipe 11, the cover plate 17 is rotated counterclockwise by the restoring force of the coil spring 18b, closing the inner opening of the nozzle guide, and the plate valve 13 is also pulled out by the coil spring 18a. It also rotates counterclockwise by the restoring force of , and closes the through hole 11a with its annular conical portion 13a.

(Effects of the invention) As described above, in this invention, as a valve device in the injection pipe of the fuel tank, the valve that opens and closes the through hole of the injection pipe communicating with the carbon canister is made into a plate shape. In this case, a push rod curved in the rotating direction of the cover plate is attached to the back of the cover plate of the nozzle guide that operates the valve, and its tip is brought close to the bottom surface of the valve in the closed state.
The rotational movement of the cover plate by the refueling nozzle can be immediately transmitted to the plate-shaped valve, so there is no waste in operating the cover plate, and the plate-shaped valve can be operated in a state where the rotational force of the push rod is perpendicular to the valve. , the valve can be rotated smoothly without tilting.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of this invention in a horizontal state. FIG. 2A is a front view taken along line A-A in FIG. 1. FIG. 1B is a partially cutaway front view taken along the line B--B in FIG. The other three figures are explanatory diagrams of the fuel vapor control device for the fuel tank. FIG. 4 is a sectional view of the conventional valve device of the circular portion shown in FIG. In the figure, 11... Injection pipe, 11a... Through hole, 12
... Valve box, 12a ... Outlet pipe, 13 ... Plate valve, 13a ... Annular conical part, 15 ... Nozzle guide, 17 ... Cover plate, 17a ... Push rod.

Claims (1)

[Scope of utility model registration request] A through hole 11a is provided in the side wall at the inlet end of the injection pipe 11 of the fuel tank, and a plate valve 13 for opening and closing the through hole 11a is rotatably provided on the side wall near the through hole 11a. A valve box 12 with an outlet pipe 12a surrounding the plate valve 13 and communicating with the carbon canister C via a pipeline L is attached to the nozzle guide 1 provided inside the injection pipe 11.
A cover plate 17 is rotatably disposed on the cover plate 17 with a spring biased to close its inner opening, and a push rod 17a curved in the direction of rotation is attached to the back surface of the cover plate 17. A valve device for a fuel tank injection pipe in which the tip of a rod 17a is brought close to the lower surface of a valve 13 in a closed state.