JPS5845969Y2 - reservoir - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a sealed reservoir.

Conventionally, such a device includes a diaphragm having a movable membrane plate portion at the opening of the reservoir body that moves downward as the liquid level in the reservoir body decreases, and an annular seal portion formed on the lower surface of the diaphragm periphery. A diaphragm holding plate that presses against the upper surface of the opening is interposed, and the cap is attached to the reservoir main body by screwing a female threaded portion formed on the inner circumferential surface of the cap to a male threaded portion formed on the outer circumference of the opening. There is.

In order to prevent twisting of the diaphragm periphery when screwing the cap onto the reservoir body, a diaphragm holding plate is provided for such a button, and the cap slides on the surface of the diaphragm holding plate and is attached to the reservoir body. I'm trying to be able to do that.

However, since the cap, diaphragm holding plate, and diaphragm are each separate bodies, when screwing on the cap, there may be a play gap between the inner circumference of the cap and the diaphragm holding plate or the diaphragm, or between the diaphragm holding plate and the diaphragm. When relative movement occurs and twisting deformation occurs at the diaphragm periphery, the annular seal portion at the diaphragm periphery may shift from the upper surface of the opening of the reservoir body, and there is a risk that the inside of the reservoir body may not be reliably sealed. Ta.

Furthermore, when attaching and detaching the cap, the diaphragm holding plate and the diaphragm must be attached and detached individually, making the attachment and detachment work of the cap extremely complicated.

By the way, in the case of a sealed reservoir as described above, the movable membrane plate of the diaphragm immediately moves downward in response to the drop in the liquid level within the reservoir body, so that a positive atmosphere is always maintained within the reservoir body. is necessary, and for this purpose it is desirable to reduce the hardness of the diaphragm as much as possible.

However, if the hardness of the diaphragm is made low, there is a risk that the button and annular seal portion at the periphery of the diaphragm may deteriorate or be damaged if stress that causes torsional deformation as described above is applied to the periphery of the diaphragm. Therefore, it was not possible to reduce the hardness of the diaphragm very much.

The present invention has been made in view of the above-mentioned problems, and aims to provide a reservoir that can solve these problems. a plurality of protrusions formed on the outer periphery of the diaphragm holding plate and having an outer diameter smaller than the inner diameter of the annular groove are rotatably loosely fitted into the annular groove; The peripheral edge of the diaphragm is integrally assembled into a recess provided in the diaphragm holding plate, and the annular seal portion is attached to the inner peripheral wall of the opening on the inner lower surface of the peripheral edge of the diaphragm. A guide portion is formed to guide the guide to a predetermined position.

EMBODIMENT OF THE INVENTION Hereinafter, an embodiment in which the present invention is applied to a brake reservoir for a mask cylinder for an automobile will be described in detail with reference to the drawings.

Referring to FIG. 1, reference numeral 1 denotes a reservoir body, which is constructed by heat-welding an upper body 2 and a lower body 3 made of synthetic resin at a joint surface 4.

A partition wall 5 is provided in the reservoir body 1 to divide it into two chambers, one of which is connected to one of the hydraulic pressure generation chambers (not shown) of the mask cylinder through a connection port T, and the other The liquid chamber 8 is connected to the other liquid pressure generating chamber (not shown) of the mask cylinder via a connection port 9.

10 is a float floating on the liquid level in the reservoir,
A permanent magnet 11 is fixed to the lower end.

Reference numeral 12 denotes a reed switch disposed in a hole provided in a protrusion on the lower side of the reservoir body 1, and when the float 10 descends to the position shown in the figure, it closes its contacts and issues a warning to the driver.

Reference numeral 13 denotes a stopper that defines the upper limit position of the float 10, and is attached to a support portion 14 that projects inside the reservoir body 1.

As shown in FIG. 2, reference numeral 15 is a cap, and a threaded portion 1 is formed at the opening 25 at the top of the reservoir body 1.
A threaded portion 16 is formed and screwed into the threaded portion 1.
An annular groove 18 having a diameter larger than the root diameter of the threaded portion 16 is formed on the upper side of the threaded portion 6 .

19 is a tightening surface. Reference numeral 20 denotes a diaphragm, which has a movable membrane plate part 21 in the center, an annular body part in the peripheral part, a diaphragm 22 that moves downward in response to a decrease in the level of brake fluid in the reservoir, and an inner circumferential wall of the opening 25 of the reservoir body 1. It has a guide part 24 that engages with 23.

Further, the lower surface of the annular body portion 22 has an opening 25 that protrudes downward.
An annular seal portion 26 is formed in sealing engagement with an upper surface 27 of the holder.

30 is a diaphragm holding plate, and as shown in detail in FIGS. 3 and 4, there is a sliding member 31 which is slidably engaged with the tightening cylinder 19 of the cap 15. and an inner guide ring wall 32 extending downward.
, has an outer guide ring wall 33.

Further, the outer guide ring wall 33 has six protrusions 34 formed equally on the upper end of its outer periphery.
Six holes 35 are drilled through the holes 3.

The annular body portion 22 of the diaphragm 20 is inserted into the recess between the outer guide ring wall 33 and the inner guide ring wall 32 of the diaphragm holding plate 30, and a hole 35 formed in the outer guide ring wall 33 is inserted. A protruding portion 36 protruding from the outer periphery of the annular body portion 22 is inserted inside, and the diaphragm 20 is assembled to the diaphragm holding plate 30.

Furthermore, in order to assemble the diaphragm press plate 30 to the cap 15, the diaphragm press plate 30 is aligned with the lower opening of the cap 15, and the diaphragm press plate 30 is attached to the cap 15.
5 , the protrusion 34 of the diaphragm holding plate 30 is elastically deformed and enters the cap 15 , and the protrusion 34 is fitted into the annular groove 18 .

In this fitted state, the diaphragm holding plate 3
The outer diameter of the protrusion 34 is slightly smaller than the bottom diameter of the annular groove 18 of the cap, and the thickness of the protrusion 34 is smaller than the width of the groove 18. It can be rotated freely relative to 15.

Next, the attachment and detachment of the cap 15 to the reservoir body 1 will be explained.

After injecting brake fluid into the reservoir body 1 through its opening 25, when the cap 15 is screwed onto the reservoir body, the diaphragm 20 and the diaphragm holding plate 30 are connected to the cap, so that the diaphragm 20 is inserted into its guide portion 24. is guided by the inner circumferential wall 23 of the opening 25 of the reservoir body 1 and moves downward while being positioned regardless of the play gap between the groove 18 of the cap 15 and the protrusion 34 of the diaphragm pressing plate 30.

When the annular seal portion 26 of the diaphragm 20 comes into contact with the opening upper surface 2T of the reservoir body 1, the rotational movement of the diaphragm 20 with respect to the reservoir body 1 is blocked due to the frictional resistance of the contact surface, and the diaphragm holding plate 30 slips. Slippage occurs between the direction 31 and the tightening surface 19 of the cap 15.

At this time, since the diaphragm presser plate 30 and the diaphragm are integrally assembled, the two do not move relative to each other due to the rotation of the cara 1150.

Therefore, the peripheral portion of the diaphragm 200, that is, the annular body portion 2
2. Stress that would cause torsional deformation does not act on the annular seal portion 26.

Further, when the cap 15 is screwed in, the annular seal portion 26 of the diaphragm 20 is pressed against the upper surface 21 of the opening of the reservoir body 1 and seals into engagement, so that the inside of the reservoir body 1 is completely shut off from the outside air.

However, the upper chamber 40 of the diaphragm 20 has a small gap between the tightening tube of the cap 15 and the sliding surface 34 of the diaphragm holding plate 30, and a gap between the engagement portion of the threaded portions 16 and 11. It communicates with the outside air through.

A hole may be actively provided between the chamber 40 and the outside air.

In such a state, if the liquid level of the flake liquid in the liquid chambers 6 and 8 of the reservoir body 1 decreases due to lining wear of the wheel brake device connected to the mask cylinder, etc., and negative pressure is generated in the reservoir body 1, Outside air is introduced into the chamber 40 through the above-mentioned gap, and the movable membrane plate portion 2 of the diaphragm 20
1 moves downward, and the inside of the reservoir body 1 is maintained at atmospheric pressure.

In this case, as described above, no stress is generated on the peripheral edge of the diaphragm 20 due to the rotation of the collar 1150, that is, there is no risk of deterioration or damage to the annular body portion 22 and the annular seal portion 26, so the hardness of the diaphragm 20 is maintained to be sufficient. Since the height can be lowered, the movable membrane plate portion 21 can immediately move in response to even the slightest pressure change within the reservoir body 1.

The pressing force between the annular seal portion 26 of the diaphragm 20 and the upper surface 2γ of the opening is limited by the contact between the lower surface of the outer guide ring wall 33 of the diaphragm holding plate 30 and the upper surface 2γ of the opening.

When removing the cap 15 from the reservoir body 1 in order to re-inject brake fluid, the diaphragm 20 and the diaphragm holding plate 30 are also removed at the same time by simply rotating and removing the cap 15.

As is clear from the above description, the present invention is designed such that the peripheral edge of the diaphragm is integrally assembled into a recess provided in the diaphragm holding plate, and the protrusion formed on the outer periphery of the diaphragm holding plate is formed into an annular groove formed on the inner periphery of the cap. By loosely fitting the diaphragm into the diaphragm, stress that would cause torsional deformation will not be concentrated on the periphery of the diaphragm due to the screw rotation of the cap, and there is no risk of deterioration or damage to the periphery or the annular seal. As a result, the stiffness of the diaphragm can be made low enough so that the movable membrane part moves immediately in response to even the slightest pressure change within the reservoir body.

In addition, by providing a guide part on the diaphragm that engages with the inner peripheral wall of the opening of the reservoir body, when installing the cap,
Regardless of the play gap between the inner diameter of the annular groove of the cap and the outer diameter of the protrusion of the diaphragm holding plate, the annular seal on the periphery of the diaphragm can be reliably positioned on the upper surface of the opening of the reservoir body. The inside can be reliably sealed.

Furthermore, since the diaphragm is integrally assembled to the diaphragm holding plate and the diaphragm holding plate is loosely fitted into the cap, the diaphragm and diaphragm holding plate can be attached and removed at the same time as the cap. It has remarkable effects such as being able to perform installation and removal operations extremely easily.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention ψ11, Fig. 2 is an enlarged view of part A in Fig. 1, Fig. 3 is an IE side view of the diaphragm holding plate shown in Fig. 1, and Fig. 4 is an enlarged view of part A in Fig. 1. FIG. 4 is a sectional view taken along line II in FIG. 3; 1... Reservoir body, 15... Cap, 18...
-Groove portion, 20...Diaphragm, 22...Annular body portion, 23...Inner peripheral wall, 24...Guide portion, 25...Opening portion, 26...Annular seal portion, 2r... Top surface, 30
...Diaphragm holding plate, 32...Inner guide ring wall,
33...Outer guide ring wall, 34...Protrusion.

Claims (1)

[Scope of utility model registration request] At the opening of the reservoir body, a diaphragm having a movable membrane plate part that moves downward as the liquid level in the reservoir body decreases, and an annular seal formed on the lower surface of the peripheral edge of the diaphragm is pressed against the upper surface of the opening. The cap is attached to a sealed reservoir by interposing a diaphragm holding plate and screwing a female thread formed on the inner circumferential surface of the cap into a male thread formed on the outer circumference of the opening. An annular groove portion having an inner diameter larger than the root diameter of the female thread portion is formed on the inner circumferential surface of the female thread portion, and a ring groove portion formed in the outer circle of the diaphragm holding plate is formed in the annular groove portion and has an inner diameter larger than the inner diameter of the annular groove portion. A plurality of protrusions having a small outer diameter are rotatably loosely coupled together, and the peripheral edge of the diaphragm is integrally assembled into a recess provided in the diaphragm holding plate, and the inner peripheral edge of the diaphragm is integrally assembled. A reservoir comprising a guide portion formed on a lower surface thereof to engage with the inner circumferential wall of the opening and guide the annular seal portion to a predetermined position on the upper surface of the opening.