JPH05172251A - Seal device - Google Patents

Abstract

PURPOSE:To prevent the inner pressure applied to a seal member from being applied to a pressing surface. CONSTITUTION:In a sealing device to put a seal member 18 in pressure contact between two members 1, 10 for sealing them from each other, either of them is provided with a pushing part 19 to push the sealing member 18 while the other is provided with a cavity 20 on the side opposite the pushing part about the sealing member. Further the two members are furnished with seal surfaces 15a, 16a with which the sealing member is in contact alongside the direction of pushing the sealing member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device for sealing a seal member by pressing a seal member between the members.

[0002]

2. Description of the Related Art A conventional technique of this type is shown in FIG. 6, for example.
And a level warning switch 102 installed in the reservoir main body 100 are liquid-tightly sealed. With the annular seal member 105 attached to the small diameter portion 104 formed in the level warning switch 102, A predetermined amount of the level warning switch 102 is inserted into the stepped fitting hole 101 formed in the reservoir body 100 (until the reservoir body 100 and the level warning switch 102 are engaged with each other by engaging means (not shown)).
insert. In the fitting hole 101, a tapered surface 103 is formed on the medium diameter portion 106, and the sealing member 105 is pressed by the pressing surface 107 of the level warning switch 102 on the tapered surface 103, so that the reservoir body 100 and the level warning member 100 are leveled. The switch 102 and the switch 102 are liquid-tightly sealed.

[0003]

However, in the above-mentioned prior art, when the level warning switch 102 is completely inserted into the fitting hole 101, the internal pressure applied to the seal member 105 is directly applied to the pressing surface 107. However, there is a problem in that workability is poor due to the large amount of power required.

Further, the level warning switch 102
Since the pressing force when inserting the into the fitting hole 101 is large,
There is also a problem that it is difficult to recognize how far the level warning switch 102 has been inserted, and as a result, a push-in failure is likely to occur.

Therefore, an object of the present invention is to prevent the internal pressure applied to the seal member from being applied to the pressing surface.

[0006]

[Constitution of the invention]

[0007]

The technical means taken in the present invention to solve the above-mentioned technical problem is a sealing device for pressing a seal member between two members to seal the two members, A pressing portion for pressing the seal member is formed on one of the two members, and a gap is formed on the opposite side of the pressing member with respect to the seal member on the other of the two members, and the seal is formed. That is, both members are formed with a sealing surface with which the sealing member abuts along the pressing direction when the members are pressed.

[0008]

The above technical means works as follows. Since a pushing portion that pushes the seal member is formed on one of the two members, and a gap is formed on the opposite side of the pushing portion with respect to the seal member on the other of the two members, When the seal member is pressed between the two members, the internal pressure applied to the seal member is absorbed by the deformation of the seal member into a void, so the internal pressure of the seal member is not directly applied to the pressing surface, so the operating force is extremely high. Assembleability is greatly improved with a small force.

Further, since the seal surfaces which the seal member contacts along the pushing direction when pushing the seal member are formed on both members, the sealing force is not impaired.

[0010]

Embodiments to which the present invention is applied will now be described in detail with reference to the accompanying drawings.

In FIG. 1, the reservoir body 1 has a cap portion 2, a master cylinder connecting hole 3 and a fitting hole 4.
The cap portion 2 is detachably and liquid-tightly closed to the reservoir body 1. The master cylinder connection hole 3 is connected to a master cylinder (not shown). Further, the reservoir body 1 has liquid chambers 5, 6, and 7 defined therein. Liquid chamber 5
And 7 communicate with the inside of the master cylinder through the master cylinder connection hole 3.

The liquid chamber 6 is installed so that the float 8 can move up and down. A magnet 9 is fixed to the lower end of the float 8, and the contact of the lead switch 11 of the level warning switch 10 fitted in the fitting hole 4 is connected by the magnetic influence of the magnet to connect the lead switch 11 to the lead switch 11. To conduct.

This will be described with reference to FIG. The fitting hole 4 includes a small diameter portion 12, a medium diameter portion 13, and a large diameter portion 14 in the reservoir body 1.
And a tapered portion 15 to be described later is formed on the intermediate diameter portion 13. The level warning switch 10 is formed with a small diameter portion 16 and a large diameter portion 17 corresponding to the medium diameter portion 13 and the large diameter portion 14. At the step between the small diameter portion 16 and the large diameter portion 17,
A pushing surface 19 is formed which pushes the seal member 18 when the level warning switch 10 is inserted into the fitting hole 4. An annular seal member 18 is attached to the outer circumference 16a of the small diameter portion 16. The seal member 18 is pressure-contacted between the reservoir body 1 and the level warning switch 10 to hold them in a liquid-tight manner, and prevents malfunction due to a liquid invading from the outside.

This will be described with reference to FIG. Tapered part 15
Comprises a first tapered surface 15a and a second tapered surface 15b. The first tapered surface 15a forms an angle α with the insertion direction of the level warning switch 10 as a reference. The second tapered surface 15b has a fitting hole 4
It is formed in order to maintain the length necessary for guiding between the middle diameter portion 13 and the outer circumference 16a of the small diameter portion 16, and the angle is not particularly limited. Also,
The first tapered surface 15a, the second tapered surface 15b, the seal member 18, and the outer peripheral surface of the small-diameter portion 17 form a void 20 described later. In addition, the first tapered surface 15
Since the opening end 21 which is the maximum diameter of a is set to be larger than the maximum diameter of the seal member 18, there is no risk of damaging the seal member 18 at the opening end 21 of the first tapered surface 15a during assembly. Is.

Next, the angle α will be described with reference to FIG. In FIG. 4, the horizontal axis indicates the amount of pushing the level warning switch 10 into the fitting hole 4 after the seal member 18 contacts the first tapered surface 15a, and the vertical axis indicates the level warning switch 10 in the fitting hole. 4 shows the load when inserted in No. 4. The diagrams created based on the experimental data when the angle α is formed at 45 degrees, 30 degrees, and 15 degrees are shown as A, B, and C, respectively. Further, the pushing amount of the level warning switch 10 required to obtain a sufficient tightening allowance is represented by MIN, MAX and MAX, respectively, as the maximum value, the minimum value and the average value due to the relationship of manufacturing dimensional errors. .. Further, in the present embodiment, the predetermined value K which is the limit of the pushing load by the hand is shown by a dotted line when working by hand, and the predetermined value K is 10 Kgf in the present embodiment. It depends on.

When the angle α is 45 degrees, MI
Although the pushing load is less than the predetermined value K at N (pushing amount 0.6 mm), if the pushing amount corresponding to about 45% of the total exceeds about 0.65 mm, the pushing load exceeds the predetermined value K. I will end up.

When the angle α is 30 degrees, the pushing amount corresponding to about 35% of the whole is about 1.1 m.
If the force exceeds m, the pushing load exceeds the predetermined value K.

When the angle α is formed at 15 degrees, the pushing amount does not exceed the predetermined value K even with the value MAX.

Therefore, the upper limit of the most preferable angle α of the first tapered surface 15a is determined by the predetermined value K based on the above experimental results. The lower limit is the seal 1
8 is determined by whether the amount of pushing required to obtain a sufficient interference is within the standard of the embodiment. In this embodiment, it is most preferable that the angle α is set to about 15 degrees.

Next, referring to FIG. 5, the seal member 18 when the level warning switch 10 is inserted into the fitting hole 4
The state of will be described. The level warning switch 10 is inserted into the fitting hole 4 until the seal member 18 comes into contact with the first tapered surface 15a (state of FIG. 3), and the pushing portion 19 comes into contact with the end portion of the intermediate diameter portion 13. Up to (the reservoir body 1 and the level warning switch 1 by engaging means not shown)
Seal member 18 when inserted (until 0 is engaged)
While being sandwiched between the first taper surface 15a and the outer circumference 16a of the small diameter portion 16, it is pushed by the pushing surface 19 and deforms into the space 20. At this time, the seal member 18 has the first tapered surface 1
Internal pressure is generated by being compressed by 5a and the outer circumference 16a, but this internal pressure is slightly applied to the pushing surface 19, but most of it is absorbed by the deformation in the void 20. Further, most of the tightening margin of the seal member 18 is obtained between the first tapered surface 15 a and the outer circumference 16 a of the small diameter portion 16.

The level warning switch 10
Since a very small insertion load is required to insert it into the fitting hole 4 of No.3, it does not require equipment such as a special assembling jig and can be most accurately and quickly assembled manually. Can be assembled.

Further, when the reservoir body 1 and the level warning switch 10 are engaged with each other by the engaging means (not shown), the engagement can be surely recognized and the insertion failure does not occur.

[0023]

According to the present invention, a pushing portion for pushing the seal member is formed on either one of the two members, and the other side of the two members is provided on the opposite side of the pushing portion with respect to the seal member. Since a gap is formed in the seal member, when the seal member is pressed between both members, the seal member is transformed into a gap by the internal pressure applied to the seal member, so the internal pressure of the seal member is not applied to the pressing surface. Only a very small amount of force is required and assembly is greatly improved.

Further, since a very small force is required for assembling, there is no need for special equipment such as an assembling jig,
The most accurate and quick assembly work can be done manually.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of a reservoir body to which the present invention is applied.

FIG. 2 is a cross-sectional view showing the configuration of this embodiment.

FIG. 3 is an enlarged view of a main part showing the configuration of the present embodiment.

FIG. 4 is an enlarged view of a main part showing the configuration of the present embodiment.

FIG. 5 is a characteristic diagram showing a pushing load with respect to a taper angle and a pushing amount corresponding to the angle.

FIG. 6 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cylinder main body (member) 10 ... Level warning switch (member) 15a ... 1st taper (sealing surface, taper) 16a ... Outer periphery (sealing surface) 18 ... Sealing member 19 ... ..Pushing surface (pushing portion) 20 ... void 21 ... open end

Claims (2)

[Claims] 1. A sealing device which presses a sealing member between two members to seal between the two members, wherein a pressing portion for pressing the sealing member is formed on one of the both members, A gap is formed on either side of the two members on the side opposite to the pushing portion with the seal member as a reference, and the seal member contacts along the pushing direction when pushing the seal member. A sealing device, wherein a sealing surface in contact with each other is formed on both members. 2. One of the two sealing surfaces has a taper in which the diameter is increased in the pushing direction and the diameter is successively reduced, and the sealing member is an annular sealing member, and the opening end of the taper is the sealing member. The sealing device according to claim 1, wherein the sealing device has a diameter larger than