JPH08175373A - Seal structure of reservoir - Google Patents

Abstract

PURPOSE: To prevent leakage of operating oil while permitting the breathing of a reservoir. CONSTITUTION: The edge of an elastic plate 3 is sandwiched and held in place between an opening 11 in a reservoir main boy 1 and a cap 2 that is freely removably threaded into the opening 11 . An annular rib 36 is projected upward in such a way as to surround a breathing slit 35 formed in the center of the elastic plate 3, and a plurality of radial ribs 37 are projected upward and outside the radius of the annular rib 36 . A plurality of preloaded projections 38 provided on the top surface of the annular rib 36 are made to abut to the bottom surface of the cap 2 to apply a downward preload to the elastic plate 3. Since the elastic plate 3 is provided with the annular rib 36 and the radial ribs 37 and exerted with the preload, the elastic plate 3 is made to have increased rigidity and therefore becomes resistant to vibration and deformation, preventing leakage of operating oil from the slit 35 .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a space between an opening of a reservoir body and a cap detachably attached to the opening.
The present invention relates to a reservoir seal structure in which a peripheral portion of an elastic plate member having a slit formed in a central portion is sandwiched and the inside of a reservoir body is communicated with the atmosphere through a communication hole formed in a slit and a cap.

[0002]

2. Description of the Related Art A seal structure for such a reservoir is already known from Japanese Patent Laid-Open No. 3-243454. According to this seal structure of the reservoir, since the slit is normally closed by the elasticity of the elastic plate material itself, the hydraulic oil contained in the reservoir is prevented from leaking to the outside, and the internal pressure of the reservoir with respect to the atmospheric pressure. When the amount increases or decreases, the elastic plate member is deformed to open the slits and allow the inside of the reservoir to communicate with the atmosphere.

[0003]

However, in the above-mentioned prior art, when the elastic plate member is bent up and down due to the vibration of the vehicle or the like, the slit is opened and the hydraulic oil may leak to the outside from the slit.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to prevent the hydraulic oil from leaking by preventing the slits of the elastic plate member from opening due to vehicle vibration or the like.

[0005]

In order to achieve the above object, the invention described in claim 1 has a central portion between an opening portion of a reservoir body and a cap detachably attached to the opening portion. In the seal structure of the reservoir, which sandwiches the peripheral edge of the elastic plate material with the slit formed in the portion and communicates the inside of the reservoir body with the atmosphere through the air communication passage formed in the outer periphery of the slit and the cap, on the upper surface of the elastic plate material An annular rib is provided so as to surround the slit, the annular rib is elastically abutted on the lower surface of the cap to preload the elastic plate material, and air can pass between the annular rib and the cap. Is formed.

The invention described in claim 2 is characterized in that, in addition to the structure of claim 1, a plurality of radial ribs extending radially outward from the annular rib are provided on the upper surface of the elastic plate material. .

[0007]

According to the structure of claim 1, since the elastic plate member is preloaded by elastically abutting the annular rib on the lower surface of the cap, it is difficult for the elastic plate member to bend up and down due to vibration or the like, and the slit is formed. Unnecessary opening is prevented. Further, even if a small amount of hydraulic oil passes through the slit, the hydraulic oil is prevented from being trapped inside the annular rib and leaking to the outside of the cap.

According to the second aspect of the invention, since the rigidity of the elastic plate member is improved by the annular rib and the radial rib, it is possible to more effectively prevent the elastic plate member from bending due to vibration.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show a first embodiment of the present invention, FIG. 1 is an overall side view of a master cylinder integrally provided with a reservoir, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. FIG. 3 is an overall perspective view of an elastic plate material.

As shown in FIG. 1, a reservoir R integrally provided on an upper portion of a master cylinder Mc of a vehicle brake device is a cup-shaped reservoir body 1 for containing hydraulic oil therein, and a reservoir body. The cap 2 which is detachably screwed into the upper surface opening 1 ₁ of the reservoir ₁ and the peripheral portion of the opening 1 ₁ and the cap 2 are sandwiched between the cap 2 and the reservoir body 1 while preventing leakage of hydraulic oil. It is composed of an elastic plate member 3 that communicates the inside with the atmosphere to perform a breathing action, and a well-known oil surface detecting unit 4 that detects the oil surface level of the hydraulic oil.

As is apparent from FIGS. 2 and 3, the rubber elastic plate member 3 formed in a substantially circular shape is used as the reservoir body 1.
An annular seal portion 3 ₁ sandwiched between the opening 1 ₁ and the cap 2 is provided. Lower surface of cap 2 and elastic plate material 3
To enhance the sealability between, with seal projection 3 ₂ two on the upper surface of the seal portion 3 _1, 3 ₃ are formed in an annular shape, the elastic plate member 3 with respect to the opening 1 ₁ of the reservoir body 1 in order to positioning, the positioning projections on the lower surface of the seal portion 3 ₁ 3
₄ (see FIG. 2) are formed in an annular shape.

A linear slit 3 ₅ is formed at the center of the elastic plate member 3 so as to vertically penetrate therethrough. Slit _3-5 is normally closes, the internal pressure of the reservoir body 1 is increased or decreased relative to atmospheric pressure, to permit passage of air and opened by the pressure difference.

On the upper surface of the elastic plate member 3, the slit 3 _{5 is formed.}
An annular rib 3 ₆ is provided to project upward so as to surround the.
The annular rib 3 ₆ and the inner sealing protrusion 3 ₂ are at 90 degrees to each other.
Four radial ribs 3 ₇ ...
Connected by. Four preload-applying protrusions 3 ₈ protruding upward from the upper surface of the annular rib 3 ₆ are in contact with the lower surface of the cap 2, whereby the central portion of the elastic plate member 3 is pressed downward and a predetermined preload is applied. with a load is given, (see FIG. 2) the air passage 5 air may pass between the annular rib 3 ₆ and the cap 2 are formed.

In order to communicate the space 6 formed between the lower surface of the cap 2 and the upper surface of the elastic plate member 3 with the atmosphere, the groove 2 ₁ formed on the inner surface of the outer peripheral portion of the cap 2 forms a gap with the outer surface of the reservoir body 1. Atmosphere communication passage 7 is formed therebetween.

[0016] In Thus, the internal pressure of the reservoir body 1 is increased or decreased relative to atmospheric pressure, inside the slit ₃₅ of the reservoir body 1 slit ₃₅ formed in the central portion of the elastic plate 3 is opened, air passage The reservoir R communicates with the atmosphere through the space 6, the atmosphere 6, and the atmosphere communication path 7, and the breathing action of the reservoir R is performed without any trouble.

[0017] When the respiration is not performed, the slit ₃₅ of the elastic plate member 3 has been closed, the reservoir body 1
The hydraulic oil stored in the above will not leak to the upper surface of the elastic plate member 3. When vibration from the road surface is input to the reservoir R, the elastic plate member 3 vibrates up and down, or because the ruffled hydraulic oil strikes the lower surface of the elastic plate 3, leakage of the working fluid by opening the slit ₃₅ there is Can occur. However, the elastic sheet 3 is annular rib 3 ₆ and has rigidity enhanced by radial ribs 3 ₇ ..., moreover given a downward preload by the contact with the lower surface of the cap 2 and the preloading projections 3 ₈ ... Therefore, the leakage of the hydraulic oil due to the vibration or unnecessary deformation of the elastic plate member 3 is reliably prevented.

[0018] Also, the hydraulic oil in the small amount passes through the slit _35, because the hydraulic oil which is trapped inside the annular rib 3 _6, reaching outside of the reservoir R via the space 6 and the air passage 7 There is no. Then, when the slit 3 ₅ is opened next time, the hydraulic oil can return to the inside of the reservoir body 1 through the slit 3 ₅ .

Next, a second embodiment of the present invention will be described with reference to FIGS.

The elastic plate member 3 of the second embodiment has an annular rib 3 ₆
The upper surface is higher than the radial rib 3 ₇ ... upper surface of preloading projections 3 in the first embodiment instead
₈ ... is not provided. Also, an air passage 5 for communicating the inside and outside of the annular rib 3 _6, is formed by a groove 2 ₂ engraved radially lower surface of the cap 2.

[0021] In Thus, according to the second embodiment, by the upper surface of the annular rib 3 ₆ is brought into contact with the lower surface of the cap 2, preload is applied an elastic plate member 3 is pressed downward. Accordingly, the elastic plate member 3 hardly cause vibration and unwanted deformation, leakage of hydraulic fluid from the slit ₃₅ is prevented. Moreover, inner and outer annular rib 3 ₆ an air passage 5 formed by grooves 2 ₂ which is engraved on the lower surface of the cap 2 so communicated, never interfere with respiration of the reservoir R.

Next, a third embodiment of the present invention will be described with reference to FIG.

The annular rib 3 of the elastic plate member 3 of the third embodiment
₆ is formed high as in the second embodiment,
A preload is applied to the elastic plate member 3 by bringing its upper surface into contact with the lower surface of the cap 2. At this time, the grooves 2 ₂ formed on the lower surface of the cap 2 in the second embodiment is unnecessary, air passages are formed by four notches 3 ₉ ... formed so as to cross the annular rib 3 ₆ .

The embodiments of the present invention have been described in detail above, but the present invention can be modified in various ways without departing from the scope of the invention.

For example, the seal structure of the present invention can be applied to the reservoir of any hydraulic equipment other than the brake device.

[0026]

As described above, according to the invention described in claim 1, an annular rib is projected on the upper surface of the elastic plate member so as to surround the slit, and the annular rib is elastically attached to the lower surface of the cap. Since the elastic plate is pre-loaded by contacting it,
It is difficult for the elastic plate member to bend up and down due to vibration or the like, which prevents unnecessary opening of the slit and prevents leakage of hydraulic oil. Further, even if a small amount of hydraulic oil passes through the slit, the hydraulic oil will not be trapped inside the annular rib and leak to the outside of the cap. Furthermore, since an air passage through which air can pass is formed between the annular rib and the cap, the inside of the reservoir body can be communicated with the atmosphere, and the breathing action can be performed without hindrance.

Further, according to the invention described in claim 2,
Since a plurality of radial ribs extending radially outward from the annular rib are provided on the upper surface of the elastic plate member, the rigidity of the elastic plate member can be improved and the bending due to vibration can be more effectively prevented.

[Brief description of drawings]

FIG. 1 is an overall side view of a master cylinder integrally provided with a reservoir.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is an overall perspective view of an elastic plate material

FIG. 4 is a diagram corresponding to FIG. 2 according to a second embodiment.

FIG. 5 is a diagram corresponding to FIG. 3 according to the second embodiment.

FIG. 6 is a diagram corresponding to FIG. 3 according to the third embodiment.

[Explanation of symbols] 1 Reservoir body 1 ₁ Opening 2 Cap 3 Elastic plate material 3 ₅ Slit 3 ₆ Annular rib 3 ₇ Radial rib 5 Air passage 7 Atmosphere communication passage

Claims (2)

[Claims] Between 1. A opening in the reservoir body (1) and (1 ₁₎ opening (1 ₁₎ to removably cap to be attached (2), the slit ₍₃₅₎ in the central portion The elastic plate material (3) thus formed is clamped at the peripheral portion thereof, and the reservoir body (1) is held.
Inside a slit ₍₃₅₎ and the seal structure of the reservoir that communicates with the atmosphere via the atmosphere communication path (7) formed on the outer peripheral portion of the cap (2) of the slit ₍₃₅ on the upper surface of the elastic plate member (3) ), An annular rib (3 ₆ ) is provided so as to surround the annular rib (3 ₆ )
The cap with preloading to the lower surface resiliently brought into contact with the (2) elastically plate (3), the annular rib (3 ₆₎ and the cap (2) air passage air can pass between (5) A seal structure for a reservoir, characterized in that 2. The reservoir according to claim 1, wherein a plurality of radial ribs (3 ₇ ) extending radially outward from the annular rib (3 ₆ ) are provided on the upper surface of the elastic plate member (3) so as to project therefrom. Seal structure.