JPH0332980Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Application of the Invention) The present invention is a fuel tank liquid level detector for automobiles, and in particular a bottom-based liquid level detector installed in a fuel tank to detect the remaining amount of fuel. It is about detection.

(Background of the invention) As a type of conventional liquid level detector,
For example, there is one shown in FIG. This liquid level detector is constructed by hanging a bracket 4 downward from the lower surface of an upper plate 3 that closes an upper opening 2 of a fuel tank 1 constituted by a combination of an upper member 1a and a lower member 1b. In addition, a movable plate 5 is supported so as to be slidable in the vertical direction, and a liquid level detector main body 10 having a float 7 is attached to the movable plate 5. A spring 6 for urging the movable plate 5 downward is interposed between the bracket 4 and the movable plate 5, so that the lower end of the movable plate 5 is always in contact with the inner bottom surface of the fuel tank 1. It is configured as a bottom reference type liquid level detector that is formed so as to be in contact with the liquid level detector. Reference numeral 8 denotes a vent tube for venting air which is held through the upper surface of the fuel tank 1, and the inner end of this vent tube 8 is opened at the upper part of the inside of the fuel tank 1. 9 indicates an oil filler port.

In the case of such a bottom-based liquid level detector, even if there is dimensional variation in the height of the container when the fuel tank 1 is manufactured, it is possible to accurately detect the amount of remaining liquid in the fuel tank 1. However, the above fuel tank 1
If there is variation in the height of the tank, a problem arises in that the amount of fuel to be filled varies due to the variation.
In other words, the amount of oil poured into the fuel tank 1 (full tank) is:
Since the position of the opening end 8' of the vent tube 8 is determined by the position of the opening end 8' of the vent tube 8, for example, the vent may be caused by variations in the height of the fuel tank 1 constructed by joining the upper member 1a and the lower member 1b with poor dimensional accuracy. If there is any variation in the height position of the open end 8' of the tube, the amount of full fuel filled into the fuel tank 1 will change due to this variation. Therefore, the FULL liquid level B at which the float 7 starts when the liquid in the tank is consumed
Then, the difference in the liquid level C between the full tank level A and the full tank level A will vary, and the travel distance until the level gauge needle starts to move (until the float starts moving) after filling the tank will change, and the opening end of the vent tube will change. When 8' is below the FULL liquid level B, a problem arises in that full tank refueling and full tank display cannot be performed.

(Purpose of the invention) The present invention was made by focusing on the conventional problems, and it is possible to maintain the position of the opening for exhausting the air inside the tank even if there are dimensional variations in the height of the fuel tank. With a structure that can always maintain a constant level based on the bottom of the tank, the amount of fuel filled into the fuel tank and the amount of fuel consumed until the level gauge (float) operates after filling the tank are constant. The object of the present invention is to provide a liquid level detector that can be leveled.

(Example of the invention) The invention will be described in detail below based on the example shown in FIGS. 1 and 2.

11 is a fuel tank for an automobile, and an upper plate 13 is attached to an opening 12 formed in the upper surface of the fuel tank 11. An upper edge of a guide tube 14 whose axis is vertically positioned is fixed to the lower surface of the upper plate 13. This guide tube 14 is provided with a pair of guide grooves 15 cut out in the generatrix direction. Reference numeral 16 denotes a moving tube that is fitted and supported within the guide tube 14, and this moving tube 16 is always urged downward by the elastic action of a spring 17. Further, the moving tube 16 has a protruding guide pin 18 that is loosely fitted into the guide groove 15, and by the guide pin 18 being loosely fitted into the guide groove 15, the moving tube 16 can be moved as follows. It is supported by the guide cylinder 14 so as to be movable only in the vertical direction against the elastic pressure of the spring 17. A known liquid level detector main body 20 having a float 19 is attached to the transfer tube 16.
Further, a through hole 21 is bored at the upper end of the transfer tube 16. 22 is the above upper plate 13
A vent tube that is installed through the tank, and the inner circumference of the transfer tube 16 is hermetically joined to the outer circumference of the tank inner end of the vent tube 22 via a packing 23. It is.

The above is the configuration of this embodiment. Next, to describe its function, the moving tube 16 to which the liquid level detector main body 20 is attached is moved by the elastic force of the spring 17.
Since it is held by the guide tube 14 so as to be movable in the vertical direction, the lower end of the moving tube 16 comes into contact with the inner bottom surface 11' of the tank 11 when the liquid level detector main body 20 is assembled into the tank 11. Therefore, the liquid level detector main body 20 is positioned within the tank 11 using the bottom surface reference method. A through hole 21 is formed at the upper end of the transfer pipe 16, and when refueling the tank 1, the air inside the tank 11 is discharged from the through hole 21 to the outside through a vent tube 22 while refueling. However, since the through hole 21 is set in the transfer pipe 16, as long as the transfer pipes 16 of the same structure are used, even if there is vertical dimensional variation in the tank 11, the inside of the tank 11 will be The highest level of refueling level (full tank level) remains constant. Therefore, even if there are variations in the vertical dimensions of the tank 11, the difference between the FULL liquid level B, at which the float 19 begins to fall, and the full liquid level A will always be constant, and after filling the tank 11, the float 19 will start and the liquid level will rise. Since the amount of fuel consumed until the meter is started can be kept constant, for example, it is possible to reduce the amount of margin between full liquid level A and FULL liquid level B as much as possible, thereby reducing the linearity of the fuel meter. This has the effect of being able to measure improvement.

(Summary of the invention) As described above, in the present invention, the vent tube 22 for releasing air is penetrated and fixed to the upper plate 13 that closes the opening 12 at the upper part of the tank 11, and the inner end of the vent tube 22 is inside the upper plate 13. The moving tube 16, which opens at the bottom and moves only in the vertical direction, is biased by a spring 17 so that its lower end is always in contact with the inner bottom surface 11' of the tank 11, and its upper end is watertightly connected to the vent tube 22. A through hole 21 is attached to the upper plate 13 so as to be in sliding contact with the upper plate 13 and communicates the inside of the tank 11 with the inner end of the vent tube 22.
is formed at the upper end of the moving pipe 16, and liquid level detecting members 19 and 20 that emit signals according to the level of the liquid level in the tank 11 are disposed in the moving pipe 16. It is a detector.

(Effect of the invention) Therefore, according to this liquid level detector, the through hole 21
is set in the transfer pipe 16, so as long as the transfer pipes 16 of the same structure are used, even if there are vertical dimensional variations in the tank 11, the highest level of the refueling surface in the tank 11 (full tank) liquid level) remains constant. Therefore, even if there are variations in the vertical dimensions of the tank 11, the float 19 will begin to descend.
The difference between the FULL liquid level B and the full tank liquid level A is always constant, and the fuel consumption can be kept constant until the float 19 starts and the level gauge starts after filling the tank full. For example, full tank level A and FULL
It is possible to reduce the margin between the liquid levels B as much as possible, which has the effect of improving the linearity of the fail meter.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of a liquid level detector according to the present invention, FIG. 2 is a front view thereof, and FIG. 3 is an explanatory view of a conventional example. 11... Fuel tank, 11'... Tank inner bottom surface,
12...Opening, 13...Upper plate, 1
4... Guide tube, 15... Guide groove, 16... Moving tube, 17... Spring, 18... Guide pin, 19
...Float, 20...Liquid level detector body, 21...
...Through hole, 22...Vent tube, 23...Patzkin.

Claims (1)

[Scope of utility model registration request] A vent tube 22 for releasing air is fixed to an upper plate 13 that closes an opening 12 at the upper part of the tank 11, and the inner end of the vent tube 22 is opened inside, and the movable tube moves only in the vertical direction. 16 is urged by a spring 17 so that its lower end is always in contact with the inner bottom surface 11' of the tank 11,
Moreover, it is attached to the upper plate 13 so that the upper end is in sliding contact with the vent tube 22 in a watertight manner, and the inside of the tank 11 and the vent tube 22 are connected to each other.
A through hole 21 communicating with the inner end of the tank 16 is formed at the upper end of the transfer tube 16, and liquid level detection members 19 and 2 emit a signal corresponding to the liquid level in the tank 11.
0 is disposed in the moving tube 16.