JPH0418933Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reservoir for storing liquid such as brake oil, and more particularly to a reservoir in which a retainer ring is fitted to the peripheral edge of a diaphragm that covers the upper opening of the reservoir body.

A cap is screwed into the upper opening of this type of reservoir, and a diaphragm is disposed inside the cap, so that the diaphragm prevents moisture, dust, etc. from entering the reservoir body. By the way, the peripheral edge of the diaphragm is tightened by a cap, but if the peripheral edge is directly tightened by the cap, the peripheral edge of the diaphragm tends to twist when the cap is rotated. Therefore, in order to prevent this twisting, a presser ring is provided on the upper surface of the periphery of the diaphragm, and the periphery of the diaphragm is tightened while sliding the press step formed on the inner peripheral surface of the cap on this presser ring. ing.

However, if such a retainer ring is used, the work of attaching or removing the cap will be laborious and cumbersome, and there is also a risk of forgetting to install the retainer ring. Therefore, an annular groove is formed on the lower surface of the presser ring, the peripheral edge of the diaphragm is fitted into this annular groove to integrate the diaphragm and the presser ring, and a plurality of protrusions are formed on the outer peripheral surface of the presser ring. While slightly deforming the ring in the radial direction, these protrusions are rotatably fitted into the annular groove inside the female thread formed on the inner peripheral surface of the cap, thereby integrating the diaphragm, retaining ring, and cap. A device that can be treated as an object has already been proposed (see Utility Model Application Publication No. 14765/1983).

However, since such a reservoir must be attached to the cap by slightly deforming the retaining ring in the radial direction as described above, the peripheral edge of the diaphragm is very likely to come off from the annular groove when the retaining ring is deformed. This made the assembly work less efficient.

In addition, a ring-shaped guide section is extended around the periphery of the diaphragm, and this is inserted into the opening of the reservoir body to position the diaphragm.
Another disadvantage was that the shape of the diaphragm became complicated and the molding cost increased.

The present invention was devised in view of the above-mentioned circumstances, and its purpose is to create a reservoir that can be assembled to a cap without deforming the retaining ring and that does not require a guide section on the diaphragm. The gist of this is to cover the upper end opening of a cylindrical reservoir body with a diaphragm, attach a presser ring to the upper surface of the periphery of the diaphragm, In the reservoir, a cap is screwed together and the peripheral edge of the diaphragm is tightened by a pressing step of the cap via the retaining ring, and an annular groove is formed on the lower surface of the retaining ring to tighten the peripheral edge of the diaphragm. is fitted into the annular groove, and a flange portion is formed on the outer circumferential surface of the retainer ring, the flange portion having a threaded portion that can be screwed into the female threaded portion formed on the inner circumferential surface of the cap, and the flange portion is rotatably fitted loosely inside the female threaded portion of the cap, further forming a ring-shaped tapered portion on the upper surface of the flange portion, sloping outward in the radial direction of the retaining ring and downward; The reservoir is characterized in that a ring-shaped pressing slope is formed on the pressing step portion of the cap in imitation of the tapered portion.

An embodiment in which the present invention is applied to a reservoir of a tandem master cylinder for an automobile will be described below with reference to the drawings. FIG. 1 shows a side view of the reservoir 1, in which 2 is a cylindrical reservoir main body, and 3 is a front chamber 4 in the lower part of the reservoir main body 2.
and a partition wall dividing the rear chamber 5, 6 is a float to which a magnet 7 is attached, and 8 is a
Switches 9 and 10 for detecting a decrease in liquid level, which are turned on, are connection ports connected to ports (not shown) of the master cylinder 11.

A male threaded portion 1 is provided on the outer peripheral surface of the upper end of the reservoir body 2.
4 is formed, and a cap 15 is attached to this male threaded portion 14.
A female threaded portion 16 is screwed together. cap 15
A rubber diaphragm 17 is disposed inside the reservoir body 2, and the upper end opening 18 of the reservoir body 2 is sealed by this diaphragm 17. A presser ring 20 shown in FIG. 2 and integrally molded from synthetic resin is fitted into the peripheral edge 19 of the diaphragm 17. Specifically, as shown in FIG. 3, an annular groove 21 is formed on the lower surface of the retainer ring 20, and the peripheral edge 19 of the diaphragm 17 is press-fitted into this annular groove 21 by a press. Further, on the inner wall 22 on the outer diameter side of the annular groove 21, a ring-shaped protruding portion 23 serving as an engaging portion having a substantially U-shaped cross section is formed along the entire circumference of the inner wall 22, and on the other hand, On the outer circumferential surface 24 of the peripheral edge 19 of the diaphragm 17, a ring-shaped concave portion 25 is provided as an engaged portion into which the convex portion 23 can fit.
is formed along the entire circumference of the outer peripheral surface 24. By fitting the protruding portion 23 and the concave portion 25 to each other, the peripheral edge 19 of the diaphragm 17
The retainer ring 20 is designed not to easily come off. Note that the upper wall 20a of the presser ring 20 is provided with a plurality of relief holes 2 as shown in FIGS. 2 and 3.
6 are formed at equal intervals in the circumferential direction, and an annular groove 21 of the presser ring 20 is formed on the peripheral edge 19 of the diaphragm 17.
When press-fitting into the annular groove 21, the air in the annular groove 21 is released from the plurality of escape holes 26 to the outside. Therefore, the peripheral edge 1 for the annular groove 21
9 can be performed extremely smoothly.

As shown in FIGS. 2 and 3, a flange portion 20b is formed on the outer peripheral wall 27 of the presser ring 20 and is continuous with the upper surface wall 20a. This flange part 2
The outer diameter of 0b is approximately equal to the outer diameter of the male threaded portion 14 of the reservoir body 2, and its cross section is the same as that of the male threaded portion 14 of the reservoir body 2.
It is formed into a substantially triangular cross-sectional shape similar to No. 4. A second
As shown in the figure, a single threaded portion 28 is formed, and this single threaded portion 28 can be screwed into the female threaded portion 16 of the cap 15. On the other hand, cap 15
As shown in FIG. 3, a ring-shaped pressing step portion 29 is formed on the inner circumferential wall of the holding ring 20 to press the top wall 20a of the holding ring 20 while sliding thereon. Further, a presser ring 2 is provided at the outer peripheral corner of the presser step portion 29.
A pressing slope 3 that presses the tapered portion 30 formed on the upper surface of the flange portion 20b of 0 while slidingly contacting the tapered portion 30.
1 are formed along the circumferential direction.

Note that the upper wall 20a of the presser ring 20 has a second
As shown in the figure, a notch 32 for ventilation is formed along the radial direction, and the female threaded portion 1 of the cap 15 is
6 is also provided with a notched groove 33 for ventilation along the vertical direction, as shown in FIG. A space 34 formed between the cap 15 and the diaphragm 17 is communicated with the outside through these notched grooves 32 and 33.

The reservoir 1 of the master cylinder 11 is constructed as described above, and the procedure for attaching the cap 15 and the diaphragm 17 to the reservoir body 2 is as follows.
9 by press-fitting, and then this diaphragm 1
7 and rotate the single screw part 28 of the presser ring 20.
is screwed into the female threaded portion 16 of the cap 15. Next, the diaphragm 17 is rotated a predetermined number of times to tighten the flange portion 20b of the retainer ring 20 into the female threaded portion 16.
It fits loosely between the terminal end 16a and the pressing step portion 29.
This allows the diaphragm 17 to
is held in cap 15 via
5. It becomes possible to handle the diaphragm 17 and the presser ring 20 as a single unit.

Note that since the retaining ring 20 is of the screw-in type as described above, there is no need to apply excessive force to the retaining ring when attaching it to the cap 15. Therefore, there is no fear that the retaining ring 20 will deform and the peripheral edge 19 of the diaphragm 17 will come off from its annular groove 21, unlike in the conventional case.

Next, the cap 15 with the diaphragm 17 attached in this manner is placed over the upper end opening 18 of the reservoir body 2, and the cap 15 is rotated so that its female threaded portion 16 is screwed into the male threaded portion 14 of the reservoir body 2. Then, the cap 15 is rotated a predetermined number of times and tightened to the reservoir body 2, thereby completing the installation work of the cap 15.

At this time, the peripheral edge 19 of the diaphragm 17 is pressed against the pressing step 29 of the cap 15 via the pressing ring 20.
, the peripheral edge 19 is pressed against the upper end surface 2a of the reservoir body 2 and the opening 18 is pressed downward.
is sealed. Note that the pressing step 2 of the cap 15
9 presses the top wall 20a of the retaining ring 20 while sliding thereon, so that no unreasonable force is applied to the peripheral edge 19 of the diaphragm 17 in the circumferential direction, preventing damage due to twisting of the peripheral edge 19 or sealing. Defects can be prevented.

Furthermore, as the cap 15 is tightened, the pressing slope 31 of the cap 15 presses the tapered portion 30 of the retainer ring 20, so even if the diaphragm 17 or the retainer ring 20 are slightly eccentric with respect to the opening 18 of the reservoir body 2, the taper portion 30, the presser ring 20 moves in the radial direction while being guided by the pressing slope, and automatically presses the diaphragm 1.
7 centering is done. Therefore, diaphragm 17
There is no possibility that the peripheral edge portion 19 will suffer from sealing failure due to eccentricity.

Note that the lower end 27 of the outer peripheral wall 27 of the presser ring 20
A is kept slightly away from the upper end surface 2a of the reservoir body 2 even when the cap 15 is completely tightened as shown in FIG. That is, by raising the lower end 27a of the outer peripheral wall 27 a little in this way, all the tightening pressure of the cap 15 can be applied to the peripheral edge 19 of the diaphragm 17, and this pressure causes the peripheral edge 19 and the reservoir to The sealing performance between the main body 2 and the upper end surface 2a can be maintained reliably.

Although one embodiment of the present invention has been described above, the present invention is not limited to the structure shown in the above embodiment and can be modified in various ways. For example, in the above embodiment, the tapered portion 30 is formed only on the upper surface of the flange portion 20b, but the tapered portion 30 is formed on the retaining ring 20.
It may be formed to extend to the top wall 20a. In this case, it goes without saying that the pressing step portion 29 of the cap 15 should be a slope continuous with the pressing slope 31.

As described above, the present invention has a flange portion formed on the outer circumferential surface of the presser ring fitted to the peripheral edge of the diaphragm, which has a threaded portion that can be screwed into the female threaded portion formed on the inner circumferential surface of the cap. Therefore, the flange portion of the presser ring can be rotatably fitted inside the female threaded portion without deforming the presser ring. Therefore, there is no fear that the peripheral edge of the diaphragm will come off the annular groove of the retainer ring unlike in conventional retainer rings, and the efficiency of the reservoir assembly work can be significantly improved.

Furthermore, when tightening the cap, the pressing slope comes into contact with the tapered part of the holding ring and moves this ring in the radial direction, thereby positioning the diaphragm. The diaphragm can be formed at low cost.

[Brief explanation of drawings]

The drawings show an embodiment in which the present invention is applied to a reservoir of a tandem master cylinder for an automobile, in which Fig. 1 is a longitudinal sectional view of the reservoir, Fig. 2 is a plan view of the retaining ring, and Fig. 3 is a cross-sectional view of the reservoir. FIG. 2 is an enlarged sectional view of the main part of FIG. 1; 1... Reservoir, 2... Reservoir body, 15...
...Cap, 17...Diaphragm, 18...Top opening of reservoir body 2, 19...Periphery of diaphragm 17, 20...Pressure ring, 21...
Annular groove, 22... Inner wall of annular groove 21, 23...
Convex part (engaging part), 25... Concave part (engaged part),
26...Escape hole, 28...Single seam portion, 29...
Pressing stepped portion, 30... Taper portion, 31... Pressing slope.

Claims (1)

[Scope of utility model registration request] The upper end opening of the cylindrical reservoir body 2 is covered with a diaphragm 17, a presser ring 20 is attached to the upper surface of the peripheral edge 19 of the diaphragm 17, and a cap 15 is screwed onto the outer periphery of the upper end of the reservoir body 2, In a reservoir in which the circumferential edge 19 of the diaphragm 17 is tightened by the press step 29 of the cap 15 via the presser ring 20, an annular groove 21 is formed on the lower surface of the presser ring 20 to prevent the diaphragm 17 from tightening. A flange in which the peripheral edge part 19 is fitted into the annular groove 21, and a threaded part 28 is formed on the outer peripheral surface of the presser ring 20, which can be screwed into the female threaded part 16 formed on the inner peripheral surface of the cap 15. The flange portion 20b is rotatably and loosely fitted inside the female threaded portion 16 of the cap 15, and the retaining ring 20 is provided with a radially outwardly extending portion on the upper surface of the flange portion 20b. A reservoir characterized in that a ring-shaped taper part 30 is formed that slopes downward, and a ring-shaped pressing slope 31 is formed on the pressing step part 29 of the cap 15, following the taper part 30.