JPH04108036A - Fuel tank device for vehicle - Google Patents

Abstract

PURPOSE:To prevent fuel from flowing into a canister by using a cylindrical liquid level detecting gage disposed in a fuel tank, in which a float that floats in a float chamber in the lower section of a cylindrical body detects a liquid level in the fuel tank, and closes a valve hole communicating the float chamber with an upper chamber. CONSTITUTION:In a cylindrical liquid level detecting gage 2 for detecting a liquid level in a fuel tank 1, the inside of a cylindrical gage body 3 is vertically divided into an upper chamber 5 and a lower float chamber 6 by a partition wall 4. Further, the float chamber 6 is communicated with a space of the fuel tank 1 outside thereof through at least two communication holes 7, 7, and is disposed therein with a float 8 which floats on the surface of fuel, and through which a float lead wire 9 is laid vertically. Further, a valve hole 10 is formed in the partition wall 4 so as to communicate the upper chamber 5 with the float chamber 6. When the float 8 comes up to the upmost level of the float chamber 6 (where the upper surface of the float 8 abuts against the partition wall 4), the valve hole 10 is closed by the float 8.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fuel tank device equipped with a cylindrical liquid level detection gauge for detecting the liquid level in a fuel tank of a vehicle.

(Prior Art) Conventionally, as a fuel tank device for a vehicle, a float that floats in a cylinder suspended from the center of the upper surface of the fuel tank into the tank has been used to automatically detect the liquid level in the fuel tank. A fuel tank equipped with a cylindrical liquid level detection gauge that detects the liquid level in the fuel tank is known.

In addition, in the fuel tank of a vehicle, for example,
As disclosed in Japanese Patent No. 291217, one end of the evaporative passageway communicating with the canister is arranged so as to protrude into the tank from the upper surface of the fuel tank, and one end of the evaporative passageway is provided with a structure in which the fuel in the tank reaches a predetermined level. A float valve that closes may be provided to collect evaporated fuel by the canister and prevent fuel from flowing into the canister.

(Problem to be Solved by the Invention) By the way, when the liquid level detection cage and the float valve are installed in one fuel tank, they are installed completely separately, and therefore the number of work steps and parts required for installation is reduced. There are problems such as increased cost and high cost.

In addition, when using a float to detect the liquid level or close a valve, it is desirable to install the float in the center of the fuel tank where the liquid level fluctuates least. It is not possible to have both a cage and a float valve.

The present invention has been made in view of these points, and its object is to provide the above-mentioned cylindrical liquid level detection gauge with the function of a float valve for opening and closing the evaporation passage. Therefore, it is an object of the present invention to provide a fuel tank device that can reduce the number of installation steps and the number of parts, and can optimize the liquid level detection and valve closing functions.

(Means for Solving the Problems) In order to achieve the above object, the solving means of the present invention is a fuel tank device for a vehicle, in which a fuel tank device that floats in a cylinder that is provided in a fuel tank and hangs down from the center of the upper surface of the fuel tank is provided. It is assumed that a cylindrical liquid level detection gauge that detects the liquid level in the fuel tank using a float is provided.

An upper chamber is formed in the upper part of the gauge cylinder and communicates with the float chamber in which the float floats via a valve hole, and one end of the evaporation passage communicating with the canister is connected to the upper chamber. Further, the valve hole is configured to be closed by the float when the float floats to the top of the float chamber.

(Function) With the above configuration, in the present invention, in the cylindrical liquid level detection gauge provided in the center of the fuel tank, the liquid level in the fuel tank is detected by the float floating in the float chamber at the bottom of the cylinder. At the same time, when the float floats to the top of the float chamber, the valve hole that communicates between the float chamber and the upper chamber is closed by the float, thereby preventing fuel from flowing from the upper chamber to the canister side through the exhaust passage. Prevented.

(Example) Embodiments of the present invention will be described below based on the drawings.

1 and 2 show a fuel tank device for a vehicle according to an embodiment of the present invention, in which 1 is a fuel tank, and 2 is a cylindrical liquid level pressure cage for detecting the liquid level in the fuel tank 1. The liquid level detection gauge 2 includes a gauge tube 3 that hangs down from the center of the upper surface of the fuel tank 1 and is disposed inside the fuel tank 1.
The gauge tube 3 is vertically defined by a partition wall 4 into an upper chamber 5 and a float chamber 6.

The float chamber 6 has at least two upper and lower communication holes 7.
7 communicates with the space outside the float chamber 6 in the fuel tank 1, and is filled with fuel at the same liquid level as the fuel tank 1. A float 8 that floats on the fuel therein is disposed in the float chamber 6, and a float lead wire 9 that passes through the float 8 and extends in the vertical direction is provided. And the above float lead wire 9
The liquid level in the fuel tank 1 is measured and detected by the position of the float 8 above.

Further, the partition wall 4 is provided with a valve hole 10 that communicates the upper chamber 5 and the float chamber 6. The valve hole 10 is located near the center of the partition wall 4, and the float 8 It is provided so that it is closed by the float 8 when it floats to the top of the float chamber 6 (the position where the upper surface of the float 8 contacts the partition wall 4). The upper chamber 5 has an evaporation passage 11 that communicates with a canister (not shown) containing activated carbon.
One end of the fuel tank 1 is connected to the fuel tank 1, and vaporized fuel generated in the fuel tank 1 is sent to a canister, where it is adsorbed and collected.

Next, to explain the operation and effect of the above embodiment, the cylindrical liquid level detection gauge 2 provided in the fuel tank 1 is activated by the float 8 floating in the float chamber 6 at the lower part of the gauge cylinder 3. The liquid level within 1 can be detected. Furthermore, when the float 8 floats to the top of the float chamber 6 due to the rolling of the vehicle, etc., the valve hole 10 of the partition wall 4 is closed by the float 8, as shown in FIG. 2, and the float valve is closed. Similarly, the function of preventing fuel from flowing out from the upper chamber 5 to the canister side through the evaporative passage 11 can be achieved. Therefore, compared to the conventional case where a liquid level detection gauge and a float valve are separately provided in the fuel tank 1, the number of installation steps can be reduced and the number of parts can be reduced. Therefore, it is possible to improve workability and reduce costs.

Further, since the tube 3 of the liquid level detection gauge 2 is arranged at the central position within the fuel tank 1 where the liquid level fluctuation is least, it is possible to appropriately perform both the liquid level detection and valve closing functions.

(Effects of the Invention) As described above, according to the fuel tank device for a vehicle according to the present invention, the cylindrical liquid level detection gauge provided in the center of the fuel tank has a liquid level detection function in the fuel tank and also controls the evaporative passage. Since the function of preventing fuel from flowing to the canister side by shutting off is also provided, it is possible to reduce the number of installation steps and parts, thereby improving workability and reducing costs. Further, since the liquid level detection gauge is located at a position in the fuel tank where the liquid level fluctuates least, the liquid level detection and valve closing functions can be performed appropriately.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a vertical sectional side view showing the overall configuration of a fuel tank device, and FIG. 2 is an enlarged view of the main part of FIG. 1. 1... Fuel tank 3... Gauge tube 6... Float chamber 8... Float 10... Valve hole 11... Evaporative passage 1... 3... 6... 8... Fuel tank gauge Cylinder float chamber float...valve hole...evaporation passage Figure 2

Claims (1)

[Claims] (1) The fuel tank is equipped with a cylindrical liquid level detection gauge that detects the liquid level in the fuel tank using a float that floats in a cylinder that hangs down from the center of the upper surface of the tank. An upper chamber is formed in the upper part and communicates with the float chamber in which the float floats via a valve hole.One end of the evaporation passage communicating with the canister is connected to the upper chamber. 1. A fuel tank device for a vehicle, characterized in that the fuel tank is closed by the float when the float floats to the top of the float chamber.