JPS641611Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a liquid level warning device for a vehicle-mounted tank that can issue a warning signal when the remaining liquid level in the tank mounted on an automobile, etc. falls below a predetermined value. .

Automobiles are equipped with various tanks for storing liquid, such as a radiator reserve tank, an oil reserve tank, a window wash tank, and a gasoline tank. These tanks may be equipped with a remaining liquid level warning device to notify when the remaining liquid level in the tank is low and to prevent problems from occurring due to running out of liquid. .

Conventionally, a remaining liquid level warning device for an on-vehicle tank has a float located at the bottom of the tank that moves up and down in accordance with changes in the liquid level, and issues a warning signal when this float falls to a predetermined low level. A device is known in which a level sensor configured to emit light is provided. However, with just this, when a car starts suddenly, makes a sudden turn, or suddenly stops, the stored liquid flows in the tank and the liquid level at the level sensor installation part drops rapidly, causing a problem in actual use. A warning signal may be erroneously issued even though the remaining amount of liquid is greater than a predetermined value. Therefore, there is a problem in that the warning lamp is turned on unnecessarily, causing a misunderstanding or discomfort to the driver.

As a prior art devised to eliminate such inconveniences, as shown in Utility Model Application No. 55-25210, the level sensor is surrounded by a cylindrical buff-full plate to prevent liquid in the float installation part. Some attempts have been made to alleviate unnecessary fluctuations in the surface and prevent the above-mentioned malfunctions. However, even with this configuration, if the acceleration acting on the vehicle is particularly large, the liquid level in the buttful plate itself will slope steeply, which may cause the float to temporarily lower and cause an error. This has the disadvantage that a warning signal is output.

The present invention was developed with a focus on this situation, and the bottom of the level sensor is surrounded by a special chamber, so that when the liquid level in the tank is about to tilt due to a sudden stop of the vehicle, etc. An on-vehicle tank that can effectively eliminate the above-mentioned disadvantages by configuring the existing float of the level sensor to be positively pushed upward by the force of the liquid flowing out from the chamber. The present invention provides a liquid remaining amount warning device.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

Radiator reserve tank mounted on a car 1
is provided with a liquid remaining amount warning device 2 according to the present invention.
The radiator reserve tank 1 includes a cap 3 attached to the top surface, a main tube 4 communicating with a radiator (not shown), and an overflow tube 5.
It is a normal type that is connected to the
is stored. The remaining liquid level warning device 2 is constructed by surrounding the lower end of a level sensor 6 disposed within the radiator reserve tank 1 with a chamber 7. The level sensor 6 is slidably fitted to a hollow shaft 8 provided upright on the bottom wall 1a of the radiator reserve tank 1 and to the outer periphery of the hollow shaft 8. The float 9 is provided with a float 9 that moves up and down, and the float 9 is placed at the upper end of the hollow shaft 8.
A locking collar 10 is provided to prevent the holder from slipping out upwards. A permanent magnet (not shown) is built into a predetermined position of the float 9, and a reed switch (not shown) is installed at a predetermined height position within the hollow shaft 8 by the magnetism of the permanent magnet.
is provided so that when the float 9 falls to a predetermined low level L, the reed switch is switched to issue a warning signal. 11 is
This is a lead wire for taking out the warning signal to the outside. On the other hand, the chamber 7 is a flat chamber provided integrally with the bottom wall 1a of the radiator reserve tank 1, and has a necessary minimum opening area in the center of the top wall 7a to allow the float 9 to pass through. A diaphragm hole 12 having a diaphragm hole 12 is opened, and a small hole 13 having a much smaller opening area than the diaphragm hole 12 is bored at the lower end of the peripheral wall 7b. The aperture hole 12 is opened at such a height that it can surround the float 9 which has descended to the upper vicinity of the low level L.

With such a configuration, when the remaining amount of the coolant A in the radiator reserve tank 1 becomes low, the float 9 of the level sensor 6 will follow the liquid level B and descend. In a steady state, the liquid level B' inside the chamber 7 and the liquid level B outside the chamber 7 drop equally due to the presence of the small hole 13, so the float 9 passes through the aperture hole 12 and enters the chamber 7.
During the descent, that is, when the float 9 reaches the low level L, the reed switch in the hollow shaft 8 is switched and a warning signal is output. On the other hand, when the float 9 descends to near the upper level of the low level L, if a sudden acceleration, sudden turn, or sudden stop is performed, the coolant A in the tank 1 flows in one direction, causing the liquid level B to rise. It tries to tilt as shown by the imaginary line in Figure 3.
At this time, the liquid level B' inside the chamber 7 also tends to tilt along the imaginary line, but since the inside of the chamber 7 is filled with the cooling liquid A, a certain amount of the cooling liquid A, that is, as shown in FIG. The amount of cooling liquid A corresponding to the volume of area C shown by diagonal lines in FIG. Therefore, when the liquid level B actually slopes as shown in FIG. lift the float 7 upward. Therefore,
It is possible to eliminate the inconvenience of the float losing support due to buoyancy and descending the moment the liquid level slopes, erroneously outputting a warning signal and inappropriately lighting up a warning lamp, etc., as in the conventional type.

Note that the tank is of course not limited to a radiator reserve tank, and may be, for example, an oil reserve tank, a window washer tank, a fuel tank, a battery, or the like.

Further, the level sensor and the chamber are not limited to those provided at the bottom of the tank, but may be suspended from the top wall 1b of the tank 1, as shown in FIG. 5, for example.

Furthermore, the chamber does not necessarily have to be integrated with the tank, and the chamber may be attached to the tank as a separate part.

Since the present invention has the above-described configuration, it is possible to provide a remaining liquid level warning device that does not malfunction even during sudden acceleration, sudden turning, or sudden braking.

[Brief explanation of the drawing]

Figures 1 to 4 show one embodiment of the present invention; Figure 1 is a partially cutaway front view, Figure 2 is a cross-sectional view showing the main parts, and Figures 3 and 4 are action explanatory views. be. FIG. 5 is a schematic sectional view showing another embodiment of the present invention. 1...tank (radiator reserve tank),
2...Liquid level warning device, 6...Level sensor, 7
...Chamber, 12...Aperture hole, 13...Small hole.

Claims (1)

[Scope of utility model registration request] In the tank, a level sensor is disposed in the tank, which has a float that moves up and down in accordance with the displacement of the liquid level in the tank, and which issues a warning signal when the float falls to a predetermined low level. The lower end is surrounded by a chamber, and the top wall of the chamber has a throttle hole at a height that can surround the float that has descended to near the top of the low level, and the lower end has a small hole that communicates the inside and outside of the chamber. A liquid level warning device for an on-vehicle tank, characterized by being provided with: