JPH0692151A - Safety device for fuel filler of vehicle tank - Google Patents

Abstract

PURPOSE: To provide a safety device which ensures the perfect safeness of the operation of an apparatus for supplying fuel to the fuel tank of a motor vehicle. CONSTITUTION: A safety device has a closed chamber 26 with an inlet aperture 15 which can be tightly closed by a ball and an outlet aperture 14 which can be tightly closed by a valve needle 4 when a vehicle is tilted excessively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention simultaneously fulfills the function of preventing overflow and the function of ventilation during use, and also prevents the discharge of fuel during use or in the case of an accident such as when the vehicle encounters a tilted state. The present invention relates to a safety device for a device that supplies fuel to a tank of a motor vehicle.

[0002]

2. Description of the Related Art Today,
Fuel tanks for motor vehicles are equipped with a set of pipes and devices that fulfill separate functions, in particular an overflow prevention function and a function of venting during use in order to let in air and escape excess fuel vapors. There must be. In addition, the devices used for these purposes guarantee complete safety, especially to prevent fuel drainage not only during normal use, but also in the event of an accident involving a steep tilt or tipping of the vehicle. Or it is essential to minimize.

To achieve such results, it is generally necessary to rely on a set of separate specialized devices. Thus, in European Patent Application No. 0333549, a device for venting the tank and preventing overflow of the tank is disclosed, which device, on the one hand, involves the use of a vent pipe closing valve and, on the other hand, an excessive tilting. In some cases, with the use of independent safety valves for ventilation and protection.

A single device has now been developed which performs the various functions necessary to ensure the correct operation and complete safety of the device for fueling the tanks of motor vehicles.

[0005]

Therefore, the present invention has a function of preventing overflow and a function of ventilation during use, and
In particular, the present invention relates to a safety device for supplying fuel to a tank of a motor vehicle, which prevents fuel from being discharged in the event of an accident. A safety device having a closed chamber with an outlet connected to a vent pipe, the two ports being arranged on a single vertical axis, In particular, it is characterized by having a first control device capable of sealing the inlet, and particularly a second control device capable of sealing the outlet when the vehicle is excessively tilted.

According to a preferred embodiment, the first control device is constituted by a lever which pivots about a spindle arranged in a closed chamber, the control rod being stressed by the tank closing device being provided at one end of the lever. The lever is provided with a compression spring for holding the control rod in the raised position, and the other end of the lever supports balls arranged in line with the inlet through a suitable circular opening, The device is arranged, on the one hand, in a closed chamber aligned with the inlet, and by a tapered profile valve seat capable of receiving balls, on the other hand, in the closed chamber, sealing the outlet. A valve needle that is capable of enclosing the ball.

In the device according to the invention, the ball-confining attachment is preferably of rectangular cross-section, the base of which has a diameter smaller than that of the ball and which is aligned with the inlet to receive the ball. Has a circular opening designed to. An excision in the sidewall of the attachment allows the swiveling lever to pass through. In general, a lever arm with a circular opening is located above the base of the attachment, and the circular opening in the lever arm is such that when the lever arm and the attachment are in the lowered position, the wall of the ball has this opening. Of the diameter of the circular opening provided in the attachment and at the same time.

Preferably, the diameter of the ball and the height of the attachment are dimensioned so that the top of the ball contacts the upper wall of the attachment when the lever arm supporting the ball is in the raised position and the attachment is in the lowered position. It has been decided.

[0009]

In the device according to the present invention, when the tank is filled, the pressure exerted on the control rod is released by the removal of the sealing device or other mechanism, and the lever is rotated by the action of the compression spring. As a result, the ball gravitationally rests on the inlet and seals it. This seal is maintained unless the pressure in the pipe connected to this inlet is sufficient to raise the ball. Therefore, generally the weight of the metal balls should be selected to be sufficient to prevent tank overflow.

Upon refilling of the closure or other mechanism after filling the tank, pressure is reapplied to the control rods causing the levers to rotate in the opposite direction, compressing the compression springs and, as a result, the balls. Rises away from the inlet and contacts the top wall of the attachment. Thus, during normal use of the vehicle, the inlet and outlet are open, air can enter the tank and fuel vapors can escape.

On the other hand, if the vehicle is over-tilted, the ball will move by gravity along a valve seat aligned with the inlet, pushing up the attachment and consequently flowing through the valve needle. Seal the outlet. With the device according to the invention, it is also possible to dimension the circular openings provided in the base and lever of the attachment so as to allow the ball to settle, thus avoiding an inadvertent sealing of the outlet.

[0012]

The safety device according to the invention will be further clarified in the description of the preferred embodiment. In this description, reference is made to the single figure of the accompanying drawing, which shows a cross-sectional view of a safety device according to the invention. As shown in FIG. 1, the safety device has a closed chamber 26 made of a metal material or a plastic material, which is connected to its lower wall by a pipe (not shown) at a high position in the tank. Has an inlet 15 and an outlet 14 on the neck 2 which is connected to a vent pipe (not shown) with a collection container, these two outlets being located on a single vertical axis.

The closed chamber 26 is further provided with a first control unit 2 capable of sealing the inflow port 15 during filling of the tank.
7 and, in particular, if the vehicle is tilted too much, the outlet 1
And a second control device 28 capable of sealing 4 together. The first control device 27 has a lever 8 that rotates around a spindle 11, and a control rod 9 to which stress is applied by the tank sealing device 1 contacts one end of the lever 8, and one end of the lever controls the control rod 9. Compression spring 1 to hold in the raised position
The other end of the lever is provided with a circular opening 13 for supporting the metal balls 7 aligned with the inlet 15.

The second control device 28 is arranged, on the one hand, in the closed chamber 26 aligned with the inlet, and by a tapered valve seat capable of receiving balls, on the other hand, in the closed chamber. And a valve needle 4 capable of sealing the outlet, said valve needle 4 comprising an attachment 5 for enclosing a ball 7. Attachment 5 has a rectangular cross section and its base is
It has a circular opening 6 adapted to receive a ball 7.

The operation of the device described above is as follows. When the vehicle is in normal use, the tank sealing device 1
However, pressure is exerted on the control rod 9, which is transmitted to the lever 8, and the rotation of the lever 8 raises the ball 7 and moves it away from the outlet 15. As the ball 7 rises, the ball 7
Only in contact with the upper wall 18 of the attachment 5 which remains in the position shown in FIG.
Away from four. Since the inlet and outlet are not blocked, air can enter the tank and fuel vapors can escape.

On the other hand, in the event of an accident, if the vehicle becomes overtilted, the ball 7 moves away from the circular openings 6 and 13 and moves along the valve seat 12, thus pushing the attachment 5 upwards. The outlet is sealed with the valve needle 4. As a result, inadvertent release of fuel is prevented by closing the outlet. During filling of the tank, the removal of the tank sealing device 1 releases the control rod 9 and the action of the compression spring 10 causes the lever 8 to pivot, so that the ball 7 gravitationally seals the inlet 15. Prevents the tank from overflowing.

[Brief description of drawings]

1 is a longitudinal sectional view of a safety device according to the present invention.

[Explanation of symbols]

 1 Tank Sealing Device 4 Valve Needle 5 Attachment 7 Ball 8 Lever 10 Compression Spring 11 Spindle 12 Valve Seat 13 Circular Opening Portion 14 Outlet Port 15 Inlet Port 26 Sealing Chamber 27 First Control Device 28 Second Control Device

Claims (3)

[Claims] 1. A safety device of a device for supplying fuel to a tank of a motor vehicle, which fulfills a function of preventing overflow and a function of ventilation during use, and particularly prevents the discharge of fuel in the case of an accident. , A closed chamber (26) having an inlet (15) provided on the lower wall and connected to a high portion of the tank by a pipe, and an outlet (14) provided on the upper wall and connected to a ventilation pipe And the two ports are arranged in a single vertical axis, the safety device comprises a closed chamber (2
6) a first control device (278) capable of sealing the inlet while the tank is being filled, and in particular a second control device capable of sealing the outlet when the vehicle is tilted excessively. (28) A safety device comprising: 2. The first control device (27) comprises a closed chamber (2
A control rod (9), which is constituted by a lever (8) which rotates around a spindle (11) arranged in 6) and which is stressed by a tank sealing device (1), contacts one end of the lever, One end of the lever is equipped with a compression spring (10) that holds the control rod (9) in the raised position, and the other end of the lever has a ball (7) aligned with the inlet (15) into a suitable circular opening. Supported by part (13),
The safety device according to claim 1. 3. The second control device (28) is arranged, on the one hand, in a closed chamber aligned with the inlet, by means of a tapered profile valve seat (12) capable of receiving a ball (7), On the other hand, it is constituted by a valve needle (4) arranged in a closed chamber (26) and capable of sealing the outlet (14), said valve needle (4) comprising a ball (7).
Safety device according to claim 2, comprising an attachment (5) for confining the.