JPH0321460Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a tank overflow prevention device, and in particular, when replenishing liquid to a tank, it is notified that the liquid has reached the full level and prevents the liquid from overflowing. This invention relates to a tank overflow prevention device that can prevent unnecessary power supply to electric circuits by using the tank cap to supply power when replenishing liquid, and can also prevent loss of the tank cap. .

[Background Art] In an internal combustion engine of a vehicle, a power source is obtained by burning liquid fuel such as gasoline or diesel oil in a combustion chamber. This fuel is placed in a fuel tank of a fuel supply device mounted on the vehicle.

This fuel tank is provided with a replenishment port for replenishing fuel from the outside. This supply port is
Opened and closed by tank cap.

[Problems that the invention aims to solve] However, conventionally, when refilling a fuel tank, it was difficult to check the amount of fuel in the fuel tank because the refill opening was narrow. There was an inconvenience that the amount exceeded the full value and overflowed from the supply port.

Further, when the tank cap is removed from the refill port when refilling the fuel tank, there is a problem in that the tank cap is lost because there is no designated place for the tank cap.

``Purpose of the invention'' Therefore, the purpose of this invention is to eliminate the above-mentioned inconvenience by using the tank cap to supply power to the electric circuit when replenishing the tank with liquid, so that the liquid in the tank becomes full. It notifies you that the amount has reached the specified value to prevent liquid overflow, allowing you to replenish the liquid with peace of mind, and also protects the electric circuit by preventing unnecessary power supply to the electric circuit. To realize a tank overflow prevention device capable of preventing a tank cap from being lost by keeping the tank cap in a constant location.

[Means for solving the problem] In order to achieve this purpose, this invention detects the amount of liquid in a tank equipped with a tank cap that opens and closes the liquid supply port, and generates an electrical amount corresponding to the amount of liquid. a bimetallic mechanism that changes a movable side contact integrated with a bimetal to move the movable side contact into and away from a fixed side contact by varying the amount of electricity from the liquid amount detection unit; In a tank overflow prevention device having a warning section connected to a side contact, a power supply section for supplying power to the bimetal mechanism side is provided in communication with the bimetal mechanism side, and the bimetal mechanism is disposed between the bimetal mechanism and the power supply section. a first contact on the side of the power supply unit and a second contact on the power supply unit side with a slight distance from the first contact;
a contact point and the second contact point are arranged inside a vehicle body wall;
A switch body is provided, which is movably held by an insulating material provided on the vehicle body side holding member, penetrates through a hole formed in the vehicle body wall, and has one end that comes into contact with and separates from the first contact and the second contact. A flange portion is provided at the other end of the switch body, and a spring is provided between the flange portion and the insulating material for biasing the switch body toward the outside of the vehicle body wall, and the switch body is pressed against the biasing force of the spring. A magnetic body is provided on the outer surface of the vehicle body wall to tightly hold the tank cap, which moves the switch body to the inside of the vehicle body wall so that one end of the body is connected to the first contact point and the second contact point. shall be.

[Function] According to the configuration of this invention, when replenishing the tank with liquid, when the tank cap is held tightly against the magnetic body on the outer surface of the vehicle body wall, one end of the switch body connects the first contact and the second contact. When the electric circuit is supplied with power and the liquid in the tank reaches the full level,
The resistance value of the sliding resistor decreases, the amount of electricity to the bimetal mechanism increases, the bimetal is displaced, and the movable contact contacts the fixed contact, activating the warning unit, and the liquid reaches the full level. I will let you know that I have become
This prevents the liquid from overflowing and allows the liquid replenishment work to be carried out with peace of mind.

Further, by supplying power to the electric circuit only when replenishing the liquid to the tank, it is possible to prevent unnecessary power from being supplied to the electric circuit and protect the electric circuit.

Furthermore, since the tank cap is held in close contact with the magnet when replenishing the tank with liquid, the tank cap can be placed in a fixed location, and loss of the tank cap can be prevented.

[Example] Hereinafter, an example of this invention will be described in detail and specifically based on the drawings.

1 and 2 show an embodiment of this invention. In the figure, 2 is a fuel tank, 4 is a fuel amount detection section for liquid fuel, 6 is an alarm lamp that is a warning section, and 7 is a bimetal mechanism. A float 8 is provided within the fuel tank 2 and moves up and down as the top surface of the fuel moves up and down. The fuel tank 2 has a tank cap 44 that opens and closes a replenishment port (not shown).
(See Figure 2).

The fuel amount detection unit 4 includes a sliding resistor 10 and an indicator 12 that follows the vertical movement of the float 8 and changes the resistance value of the sliding resistor 10.

One end of a first electric path 14 is connected to the sliding resistor 10 . The other end of this first electric path 14 is connected to one end of a heating coil 16 wound around a bimetal 48 of the bimetal mechanism 7 .

A second electric circuit 1 is connected to the other end of this heating coil 16.
One end of 8 is connected. A first contact 20 is attached to the other end of the second electric path 18 .

At a position slightly apart from this first contact point 20,
A second contact 22 is provided. This second contact point 2
2, one end of a third electric path 24 is attached.
A power supply section 26 is interposed in the middle of this third electric path 24. Further, the other end of this third electric path 24 is grounded.

The first contact point 20 and the second contact point 22 are arranged inside the vehicle body wall 32, as shown in FIG.

The first contact 20 and the second contact 22 are brought into contact and separated by one end 28a of the switch body 28. The switch body 28 is movably held by an insulating material 30 provided on a holding member 34 fixed to a vehicle body wall 32, and one end 28a is brought into contact with and separated from the first and second contacts 20 and 24.

The other end 28b of the switch body 28 is disposed so as to penetrate through a hole 36 formed in the vehicle body wall 32 and to be located outside the outer surface 32a of the vehicle body wall 32.

A flange portion 38 is provided at the other end portion 28b of this switch body 28. A spring 40 is provided between the flange portion 38 and the insulating material 30 to urge the switch body 28 toward the outside of the vehicle body wall 32.

In addition, the outer surface 32a of the vehicle body wall 32 at the periphery of the hole 36
A magnet body 42 is attached to the.

This magnet body 42 has one end 28a of the switch body 28 in contact with the other end 28b of the switch body 28 to be connected to the first and second contacts 20 and 21, so that the switch body 28 is attached to the inside of the vehicle body wall 32. This is to tightly hold the tank cap 44 to be moved.

Therefore, when the tank cap 44 is held in close contact with the magnet 42, the switch body 28 is pushed against the pressing force of the spring 40 due to the presence of the cap protrusion 44a of the tank cap 44, and the switch body One end 28a of 28 connects the first contact 20 and the second contact 22 to supply power to the bimetal mechanism 7 side.

On the other hand, when the tank cap 44 is not tightly held by the magnet 42, the one end 28a of the switch body 28 is separated from the first contact 20 and the second contact 22 by the pressing force of the spring 40. Therefore, no power is supplied to the bimetal mechanism 7 side.

The heat coil 16 has a support portion 4 on the base end side.
A bimetal 48 supported by 6 is mounted. A movable contact 50 is fixed to the free end of this bimetal 48. This movable contact 5
This movable contact 5 is located at a position slightly apart from 0.
A fixed side contact 52 that connects and separates 0 is provided.
One end of a fourth electric path 54 is attached to this fixed side contact 52. An alarm lamp 6 serving as a warning section is interposed in the middle of the fourth electric line 54. Further, the other end of this fourth electric path 54 is grounded.

Next, the operation of this embodiment will be explained.

When refueling the fuel tank 2, first,
Remove the tank cap 44 from the supply port and insert it into the hole 3.
It is held in close contact with a magnet body 42 provided on the outer surface 32a of the 6th periphery.

At this time, the cap protrusion 44a of the tank cap 44 contacts the other end 28b of the switch body 28 and pushes the switch body 28 against the pressing force of the spring 40.
8a is brought into contact with the first contact 20 and the second contact 22. As a result, current flows through the heating coil 16 and the sliding resistor 10.

When there is little fuel in the fuel tank 2, the float 8 is located at the bottom, so the indicator needle 12 is located along the sliding resistor 10 in the direction of increasing resistance. As a result, the current to the heating coil 16 decreases, and since the temperature of the heating coil 16 is low, the bimetal 48 is not displaced. Therefore, the movable contact 50 does not come into contact with the fixed contact 52, and the alarm lamp 6 does not light up.

When the fuel is replenished into the fuel tank 2 and increases, the float 8 moves upward, and thereby the indicator needle 12 moves along the sliding resistor 10 in a direction where the resistance value becomes smaller. Therefore, the current to the heating coil 16 increases, and the temperature of the heating coil 16 increases.

Then, when the fuel tank 2 becomes full of fuel, the temperature of the heating coil 16 further increases, and the bimetal 48 is accordingly displaced in a curved manner with the indicator portion 46 as the center. Finally, the movable contact 50 provided at the free end of the bimetal 48 comes into contact with the fixed contact 52, and current flows through the fourth electrical circuit 54, lighting up the alarm lamp 6 to notify that the fuel is full. do.

As a result, it is possible to detect the optimal time to prevent fuel from overflowing from the filling port.
It is possible to prevent fuel overflow and perform fuel replenishment work with peace of mind.

Further, since power is supplied to the electric circuit, that is, the bimetal mechanism 7 and the warning lamp 6, etc. only when refueling, it is possible to protect the electric circuit by preventing unnecessary power supply to the electric circuit. can.

Furthermore, the tank cap 44 can be held in close contact with the magnet 42 when refueling, so that the tank cap 44 can be placed at a constant location, and loss of the tank cap 44 can be prevented.

Note that this invention is not limited to the above-mentioned embodiments,
Of course, various applications and modifications are possible.

For example, in the above-described embodiment, the warning lamp 6 is provided as a warning section, but it is possible to provide a warning section such as a warning buzzer in place of this lamp.

Further, although the magnet body 42 is provided around the hole 36 on the outer surface 32a of the vehicle body wall 32, it is also possible to attach a rubber magnet or the like.

[Effects of the invention] As is clear from the above detailed explanation, according to this invention, a power supply section that supplies power to the bimetal mechanism side is provided in communication, and a power supply section on the bimetal mechanism side is provided between the bimetal mechanism and the power supply section. A first contact and a second contact on the power supply side are provided at a certain distance from the first contact,
A first contact point and a second contact point are arranged inside the vehicle body wall,
A switch body is provided which is movably held by an insulating material provided on the vehicle body side holding member and which is penetrated through a hole formed in the vehicle body wall so that one end of the switch body contacts and separates from the first contact and the second contact. A flange is provided at the end,
A spring is provided between the flange portion and the insulating material to bias the switch body toward the outside of the vehicle body wall, and the switch body is pressed so that one end of the switch body is connected to the first contact and the second contact against the biasing force of the spring. By installing a magnetic body on the outer surface of the car body wall that holds the tank cap in close contact with the tank cap, it is possible to notify when the liquid in the tank has reached the full level and prevent the liquid from overflowing. It allows liquid replenishment work to be carried out with peace of mind, and protects the electrical circuit by preventing unnecessary power supply to the electrical circuit.
To prevent a tank cap from being lost by keeping the tank cap in a constant location.

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of this invention; Figure 1 is a system configuration diagram of a tank overflow device;
FIG. 2 is an enlarged explanatory configuration diagram of the arrows in FIG. 1. In the figure, 2 is a fuel tank, 4 is a fuel amount detector, 6 is an alarm lamp, 7 is a bimetal mechanism, 8 is a float, 10 is a sliding resistor, 12 is an indicator needle, 1
6 is a heating coil, 26 is a power supply part, 28 is a switch body, 32 is a car body wall, 36 is a hole part, 42 is a magnet body, 44 is a tank cap, 48 is a bimetal,
50 is a movable contact, and 52 is a fixed contact.

Claims (1)

[Scope of utility model registration request] A liquid amount detection section that detects the amount of liquid in a tank equipped with a tank cap that opens and closes the liquid replenishment port and outputs an amount of electricity corresponding to the amount of liquid, and the amount of electricity from this liquid amount detection section. A tank overflow prevention device comprising: a bimetal mechanism that moves a movable contact integrated with a bimetal to bring the movable contact into contact with and away from a fixed contact; and a warning section connected to the fixed contact. A power supply unit for supplying power to the side is provided in communication with each other, and between the bimetal mechanism and the power supply unit, a first contact on the bimetal mechanism side and a first contact on the power supply unit side, spaced a little apart from the first contact, are provided. 2 contacts are provided,
The first contact point and the second contact point are disposed inside the vehicle body wall, and are movably held by an insulating material provided in the vehicle body side holding member, and are penetrated through a hole formed in the vehicle body wall so that one end thereof is disposed inside the vehicle body wall. A switch body is provided that contacts and separates from the first contact and the second contact, a flange is provided at the other end of the switch, and the switch body is connected to the outside of the vehicle body wall between the flange and the insulating material. the switch body is moved inside the vehicle body wall so that one end of the switch body is connected to the first contact and the second contact, against the biasing force of the spring; A tank overflow prevention device characterized in that a magnet body for tightly holding a tank cap is provided on the outer surface of the vehicle body wall.