JPS6228531Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic fluid reservoir used in a brake or clutch device of a vehicle or the like.

Conventionally, this type of device has a main body that has an opening at the top and stores hydraulic fluid, a float arranged inside the main body so as to be able to move up and down, a magnet attached to the float, and a magnet that moves the magnet to a predetermined position. a reed switch arranged so as to be actuated by the change of A confirmation device is known that is capable of pushing down the float until it moves to a predetermined position.

However, in these conventional filters, it is necessary to allow the rod-shaped member and the float to come into contact with each other, so the float is located above the filter, and furthermore, the float is located above the filter as the liquid volume decreases. Since the float needs to be displaced downward, the filter must be shaped like a droplet and its length in the vertical direction must be sufficiently large according to the required movement length of the float, resulting in the problem of an increase in the size of the filter.

For this reason, it is conceivable that the float is positioned below the filter and the rod-shaped member is fitted into the hole provided in the filter, but in this case, since the hole is provided in the filter, the cap etc. When removing the valve and replenishing the hydraulic fluid, problems may arise if dirt enters through this hole.

The present invention was made in view of the above-mentioned problems, and aims to provide a hydraulic fluid reservoir that allows the filter to sufficiently perform its functions while reducing the size of the filter.To achieve this purpose, The float is disposed below the filter, and the filter is formed with an upwardly protruding portion having a through hole, and the rod-shaped member is loosely fitted into the through hole.

Hereinafter, the hydraulic fluid reservoir of the present invention will be explained in detail based on illustrated examples.

FIG. 1 is a side cross section of a hydraulic fluid reservoir according to a first embodiment of the present invention, and FIGS. 2 to 4 are a side cross section of a hydraulic fluid reservoir according to a second embodiment of the present invention.
FIG. 4 is a cross-sectional view of a main part showing four embodiments.

In FIG. 1, the hydraulic fluid reservoir is indicated as 1 as a whole, and this reservoir 1 is used in a tandem master cylinder for brakes.
It has a main body 3 having an internal space 2.

The main body 3 has a cylindrical side wall 4 and a bottom wall 7 in which liquid connecting portions 5 and 6 are formed at the left and right ends, and further includes liquid connecting portions 5 and 6 that extend to a predetermined height of the internal space 2. A partition wall (not shown) is formed upward from the bottom wall 7 to partition chambers 8 and 9 that are independently connected to each other. It has a guide wall 11. The float chamber 10 has a shaft portion 12 with a reduced diameter at the center of the upper part.
A float 15 having bulges 14 with grooves 13 on the upper and lower sides thereof is inserted into the grooves 13 so as to be vertically movable by fitting the grooves 13 into a plate-shaped guide 16 formed in the vertical direction inside the guide wall 11. There is. float 15
is equipped with a magnet 17 at its lower end, and a reed switch (not shown) inserted into a hole 18 provided in the central outer surface of the bottom wall 7 can be opened and closed by the magnetic force of the magnet 17.

Note that the guide wall 11 is provided with two notches (not shown), and one of the notches is provided in the guide wall 11.
It is provided from the upper end to the lower end, and there are 10 float chambers.
The other notch is provided at a predetermined height from the upper end of the guide wall 11, and the float chamber 10 and chamber 9 are communicated with each other at a predetermined height or higher. There is. This predetermined height is defined as the height of the liquid level at which the float 15 is lowered to a position where the reed switch is activated by the magnet 17 when the liquid level in the chamber 8 or 9 decreases to that level. There is.

A cap 19 is screwed onto the upper end of the main body 3, and the cap 19 includes an outer member 20 having a cup shape and a side wall 4 located below the outer member 20.
The inner surface member 21 which is fitted inside the inner surface member 21 is joined with the inner surface member 21 with unevenness. The inner surface member 21 has a wave-shielding plate 22 at its lower end that is large enough to almost block the inside of the side wall 4, and forms a radial gap 23 between the wave-shielding plate 22 and the main portion. , this gap 2
3 is connected via a small hole 26 between two concentrically formed cylindrical portions 24 and 25. This cylindrical portion 24,
25, the outer surface member 20 has both cylindrical portions 24, 2.
2, which is concentric with 5 and located between both cylindrical parts 24 and 25 to form an annular passage between each cylindrical part 24 and 25.
Two protrusions 27 and 28 are formed. Therefore, the internal space 2 includes the space between the wave shielding plate 22 and the side wall 4, the gap 23, the small hole 26, between the two cylindrical parts 24 and 25, the annular passage, the space between the internal members 20 and 21, and the space not shown. It is connected to the outside through passages.

Further, a confirmation device 29 is attached to the cap 19 concentrically with the cylindrical portion 24. This device 29
has a shaft-like member 30 movably penetrating through the inner surface member 21 and the outer surface member 20, and the shaft-like member 3
The head 31 of 0 has a diameter-increased shape and is biased upward by a relatively low tension spring 32 stretched between the upper part of the outer surface member 20 and the outer surface of the intermediate portion. A stopper 33 provided below the member 20 prevents it from coming off. 34 is a spring receiver, and 35 is an O-ring.

A filter 37 having a mesh portion 36 is disposed between the cap 19 and the guide wall 11, and is fitted between the guide wall 11 and a small protrusion 38 provided on the side wall 4.

The filter 37 includes a large cylindrical portion 39 extending upward along the side wall 4 with the mesh portion 36 as a bottom portion;
It has a small cylindrical part 40 extending upward in the central part, and the inside of the small cylindrical part 40 is formed as a through hole 41 that freely communicates the upper and lower parts of the filter 37.
The shaft member 30 of the confirmation device 29 and the shaft portion 12 of the float 15 are freely fitted into the through hole 41 .

Additionally, in FIG. 1, 42 indicates an O-ring.

The hydraulic fluid reservoir 1 has its fluid connection portions 5 and 6 connected directly or indirectly to each fluid communication portion of a tandem master cylinder (not shown).

The functions of the hydraulic fluid reservoir 1 will be described below.

Assume now that the hydraulic fluid reservoir 1 has not been installed on the actual vehicle and that hydraulic fluid has not yet been supplied.

In order to supply hydraulic fluid, only the cap 19 is removed, and the hydraulic fluid is poured toward the mesh portion 36 of the filter 37. Then, the hydraulic fluid falls into the chambers 8 and 9 through the mesh part 36, and the fluid connects to the fluid connection parts 5 and 6.
The working fluid is gradually supplied into each chamber 8, 9 and the float chamber 10 including the float chamber 10. At this time, each room 8,
The air in the filters 9 and 10 escapes to the outside between the filter 37 and the side wall 4 and through the through hole 41. Furthermore, as the level of the hydraulic fluid rises, the float 15 eventually rises against the buoyancy, but the through hole 4
Air removal from 1 is carried out without any hindrance.

Thereafter, when sufficient hydraulic fluid is supplied, the cap 19 is screwed onto the main body 3. At this time, since the float 15 is moving upward, the shaft portion 12 of the float 15 and the shaft member 30 come into contact with each other, and the cap 1
By the time 9 is completely screwed together, the entire float 15 will sink slightly into the liquid, but since the magnet 17 is far enough away from the reed switch, the reed switch will not operate.

After that, in order to confirm the operation of the reed switch, the shaft member 30 is pushed in against the biasing force of the spring 32 and the buoyant force of the float 15.
The float 15 moves downward until the magnet 17 abuts the bottom wall 7.

Therefore, at this point, if the alarm device or display device connected to the reed switch operates to notify you of a lack of fluid, you will know that each device is functioning normally; on the other hand, if it does not operate, it will eventually occur. By knowing when something is malfunctioning, you can prevent danger from occurring.

During normal use, when the internal liquid level drops to a predetermined height, the float 15 is lowered by the magnet 17 to a position where the reed switch is activated, thereby notifying the user that the liquid level is insufficient.

According to the above-described embodiment, the through hole 41 is
It has a function of allowing the passage or movement of the shaft-shaped member 30 and the shaft portion 12, and a function of facilitating air removal while preventing the intrusion of dust, etc., and the function of the filter 37 is achieved without complicating the structure. and confirmation device 29
function can be fully achieved.

Furthermore, the filter 37 itself does not need to have a length that corresponds to the movement length of the float 15, but only needs to have a length that forms two relatively short cylindrical portions 39 and 40.
The filter 37 can be made smaller.

Furthermore, when replenishing liquid, etc., the confirmation device 29 and the like do not complicate the work and do not impede workability.

As described above, the example shown in FIG. 1 provides various effects, but it goes without saying that the present invention is not limited to this example and can be implemented.

That is, to explain with reference to FIGS. 2 to 4, an example in which the length of the shaft member 30' is made longer instead of providing the shaft portion 12 on the float 15 (see FIG. 2), the spring 32, the spring An example of inserting the receiver 34 etc. into the inside of the cap 19 to make effective use of space (see Figures 2 to 4), an example of using the inner member 21 as the spring receiver 34 etc. (see Figures 3 and 4), Examples include an example in which a portion of the shaped member 30'' is made to play a role by lengthening the shaft portion 12 of the float 15 (see Fig. 4), etc. In addition to these examples, there are various other examples. Changes are possible.In addition, in Figures 2 to 4, the reference numerals of each member are the same as those of the corresponding members in Figure 1, or the reference numbers with a dot have been added to provide detailed explanations. Omitted.

As is clear from the above description, according to the present invention, it is possible to obtain a hydraulic fluid reservoir that can reduce the size of the filter and reliably prevent the intrusion of rubber and the like.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a hydraulic fluid reservoir according to one embodiment of the present invention, and FIGS. 2 to 4 are sectional views of essential parts of other embodiments of the present invention. DESCRIPTION OF SYMBOLS 1... Hydraulic fluid reservoir, 12... Shaft part, 15... Float, 30, 30', 30''... Shaft-like member, 37... Filter, 39... Large cylinder part, 40... Small cylinder part, 41... Through hole.

Claims (1)

[Scope of utility model registration request] A main body having an opening at the top and storing hydraulic fluid, a float disposed inside the main body so as to be movable up and down, a magnet attached to the float, and a lead disposed so as to be operable when the magnet is moved to a predetermined position. The device includes a switch, a filter disposed on the opening side of the main body, a cap attached to the opening, and a rod-shaped member whose lower end can come into contact with the float, and pushes the float until the magnet moves to a predetermined position. In the hydraulic fluid reservoir having a confirmation device that can be lowered, the float is disposed below the filter, and the filter is formed with an upward protrusion having a through hole, and the rod-shaped member is inserted into the through hole. A hydraulic fluid reservoir that is loosely fitted.