JPH049557Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a liquid level reduction alarm device for a storage tank such as a tank or a reservoir.

[Conventional technology]

For example, in the reservoir of a vehicle hydraulic master cylinder, a reed switch is installed at the bottom of the reservoir, and when a float that rises to the surface of the liquid in the reservoir descends as the liquid changes and approaches the reed switch by a predetermined distance. A magnet mounted on the float activates a reed switch to alert the user that the reservoir liquid is low.

However, in this configuration, since the float floats on the surface of the stored liquid, the float may move up and down due to ripples in the stored liquid while the vehicle is running, which may cause the reed switch to malfunction.

For this purpose, for example, as shown in Japanese Utility Model Application Publication No. 58-141826, a guide tube is provided in the reservoir of a vehicle hydraulic master cylinder, a vertical groove is formed in the lower part of the guide tube, and the guide tube is Some devices have a float immersed in the stored liquid, and the legs of the float are inserted into the grooves of the guide tube to prevent malfunctions caused by ripples in the stored liquid.

[The problem that the idea aims to solve]

However, in the above-mentioned configuration, since the guide tube is provided in the reservoir, the structure is complicated, molding is troublesome, and the guide portion of the float must be formed at the bottom of the guide tube.

Therefore, the object of the present invention is to provide a storage tank liquid level reduction alarm device that has a simple structure, does not require a special float guide part, and is less likely to cause malfunctions due to undulation of the hydraulic fluid. .

[Means to solve the problem]

In order to achieve the above object, the present invention provides a liquid level reduction alarm device for a storage tank that operates a reed switch provided at the bottom of the storage tank using a magnet fixed to the bottom of a float that moves up and down as the stored liquid changes. A switch case of a reed switch is provided horizontally at the bottom of the storage tank, the inner end of the switch case is formed into a vertical surface, and a rib connecting the inner end and the inner wall of the storage tank opposite to the inner end is formed horizontally. the float is provided with a leg portion having a long groove having a length for inserting the rib into the float to move the float up and down below the standard liquid level of the stored liquid, and a lower inner wall of the leg portion; The present invention is characterized in that a retaining pawl is formed in the long groove, and the float, in which the rib is inserted into the long groove, is guided in the vertical direction by the inner vertical surface of the switch case and the rib.

[Effect]

As a result, the float is placed submerged in the stored liquid, making it less susceptible to the effects of ripples in the stored liquid, and the ribs that hold the switch case horizontally can be used to guide the float. can.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to a reservoir of a hydraulic master cylinder will be described based on the drawings.

1 to 3 show an embodiment of the present invention, in which a reservoir mounting flange 2 is integrally molded on the upper surface of the cylinder body 1, and the inside of the reservoir mounting flange 2 is formed by a partition wall 3 to connect the primary side fluid. An auxiliary liquid reservoir 4 communicating with the chamber and a liquid passage 5 communicating with the liquid chamber on the secondary side.
It is divided into an auxiliary liquid reservoir 6 which communicates with the liquid via the auxiliary liquid reservoir 6.

A reservoir 7, which is a storage tank molded from synthetic resin, is attached to the reservoir mounting flange 2 at its mounting portion 8.
is fitted and tightened with a reservoir band 9 and attached to the cylinder body 1.

The reservoir 7 is formed into a substantially cylindrical shape, and the upper opening is connected to the cap 11 via the diaphragm 10.
The bottom opening is sealed by the auxiliary liquid reservoir 4,
It is connected to 6.

On the inner wall of the reservoir 7, four ribs 12 in the vertical direction facing each other are provided at equal intervals from the middle part to the bottom part. Of these four ribs 12,
A switch case 13 is disposed horizontally from the bottom of one rib 12 across the bottom opening of the reservoir 7. The inner end of the switch case 13 is formed in a vertical plane, and a rib 14 is horizontally arranged to connect the inner end to the inner wall of the reservoir 7 via the bottom of the rib 12 facing the inner end. . These 2
The bottoms of a pair of opposing ribs 12, 12, which are separate from the book, are connected by a rib 15 that extends orthogonally to the switch case 13 and across the bottom opening. A reed switch 16 is provided within the switch case 13.

A float 17 is attached to the rib 14 so as to be movable up and down. The float 17 is made of synthetic resin and is integrally molded with a main body 17a on which a magnet 18 for operating the reed switch 16 is fixed at the bottom, and a leg 17b provided on one side of the main body 17a. A longitudinal long groove 17c is formed in the portion 17b, and retaining claws 17d, 17d for regulating the floating position of the float 17 are provided on the lower inner wall of the leg portion 17b in which the long groove 17c is formed.
They are placed opposite each other at an interval slightly narrower than the thickness of the

The long groove 17c is formed in such a length that the float 17 is positioned below the liquid level when the liquid level of the stored liquid in the reservoir 7 is at the standard liquid level.

When the float 17 is inserted between the retaining claws 17d and 17d from above the rib 14 and the float 17 is pushed, the retaining claws 17d and 1
7d is expanded and a rib 14 is formed in the long groove 17c.
By inserting the main body 17a, the main body 17a is positioned above the switch case 13 and attached to the rib 14, and is guided in the vertical direction by the inner vertical surface of the switch case 13 and the rib 14.

As a result, when the level of the stored liquid in the reservoir 7 is at the standard level, the float 17 is placed in the reservoir 7 in a submerged state, and when the level of the stored liquid falls, switch case 13
When the level of the stored liquid reaches a predetermined position, the reed switch 16 is actuated to warn that the stored liquid has decreased.

Further, the ribs 15 are formed at a height that guides both sides of the float 17 so that the float 17 moves up and down without swinging left and right.

Therefore, even if ripples occur in the hydraulic fluid due to vibrations or the like during running, the float 17 is submerged in the hydraulic fluid, so it is less affected by the ripples and malfunction of the reed switch 16 can be prevented.

Moreover, since the float 17 is vertically movably mounted on the rib 14 that holds the switch case 13 horizontally, there is no need to separately mold a guide member for the float 17.

In the above embodiments, the present invention has been described as applied to a reservoir of a hydraulic master cylinder, but it can also be applied to a reservoir of a radiator, a fuel tank, or the like.

[Effect of idea]

As described above, the storage tank liquid level reduction alarm device of the present invention has a reed switch switch case installed horizontally at the bottom of the storage tank, and the inner end of the switch case is formed into a vertical surface. A long groove in which ribs are horizontally arranged in series with the inner wall of the storage tank facing the inner end, and the ribs are inserted into the float to move the float up and down below the standard liquid level of the stored liquid. A stopper claw is formed on the inner wall of the lower part of the leg, and the float, which has a rib inserted into the long groove, is guided in the vertical direction by the vertical surface of the inner end of the switch case and the rib. The structure is simple, and the float is guided using ribs that hold the switch case horizontally, so there is no need to provide a separate guide member, and moreover, the float is placed submerged in the stored liquid. At the same time, since the distance that the float moves up and down can be shorter than that of the floating type, it is less susceptible to the effects of ripples in the stored liquid, and malfunctions of the reed switch can be prevented.

[Brief explanation of the drawing]

The figures show an embodiment in which the present invention is applied to a reservoir of a hydraulic master cylinder. Fig. 1 is a cross-sectional front view of the reservoir, Fig. 2 is a cross-sectional view of Fig. 1, and Fig. 3 is a cross-sectional view of the reservoir. FIG. 1...Cylinder body, 7...Reservoir, 13...
... Switch case, 14 ... Rib, 16 ... Reed switch, 17 ... Float, 17b ... Leg part, 17c ... Long groove, 17d ... Retaining claw, 1
8...Magnet.

Claims (1)

[Scope of utility model registration request] In a storage tank liquid level reduction alarm device that operates a reed switch installed at the bottom of the storage tank using a magnet fixed to the bottom of a float that moves up and down as the storage liquid changes, the reed switch is installed at the bottom of the storage tank. A case is provided in a horizontal direction, an inner end of the switch case is formed into a vertical surface, a rib is provided in a horizontal direction connecting the inner end and an inner wall of the reservoir opposite to the inner end, and a rib is provided in the horizontal direction, , a leg portion having a long groove having a length for inserting the rib and moving the float up and down below the standard liquid level of the stored liquid is provided, a retaining claw is formed on the inner wall of the lower part of the leg portion; A liquid level reduction alarm device for a storage tank, characterized in that the float, in which the rib is inserted into a long groove, is guided in the vertical direction by an inner vertical surface of the switch case and the rib.