JP2568522Y2 - Reservoir cap - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap for a reservoir for storing hydraulic oil of a hydraulic device such as a master cylinder, and more particularly, to a cap body attached to a refueling port cylinder of a reservoir and a plunge into the refueling port cylinder. A ventilation passage body which is fitted in a mounting cylinder formed in the cap body to define an expansion chamber in the mounting cylinder, wherein a ventilation hole for communicating the expansion chamber to the outside is provided in the cap body, while a ventilation path is provided. The present invention relates to a body provided with a vertical hole communicating with an expansion chamber through a reservoir.

[0002]

2. Description of the Related Art Conventionally, in a reservoir cap of this kind, when a liquid stored in a reservoir rises, the liquid that enters the vertical hole of the ventilation path and stops rising is prevented from leaking from the ventilation hole of the cap body. For this purpose, there is known a structure in which a barrier plate covering the upper opening end of the vertical hole is fitted to an air passage body (for example, see Japanese Utility Model Application Laid-Open No. 58-168956).

[0003]

[Problems to be solved by the invention] In the above conventional structure,
Since a separate barrier plate is fitted to the air passage body, the number of parts is increased and the cost is inevitable. Also, it is necessary to provide a small hole in the barrier plate that connects the vertical hole to the expansion chamber, but since the barrier plate is thin, the small hole is extremely shallow,
Therefore, when the stored liquid in the reservoir is wavy, there is a concern that the strong liquid that has risen up the vertical hole easily passes through the small hole, reaches the vent hole of the cap body, and leaks out therefrom. .

The present invention has been made in view of the above circumstances, and provides the above-described cap which has a small number of parts, has a simple structure, and can effectively prevent liquid from leaking from a vent hole of the cap body. The purpose is to do.

[0005]

In order to achieve the above object, the present invention provides a cap body having an end wall defining an expansion chamber in a mounting cylinder and a body fitted to the mounting cylinder. the end and vent tube depending from wall lower surface, in the upper surface of the end wall to cover the upper open end of the vertical hole penetrating the ventilation tube and the end wall
An air passage body comprising a barrier portion protruding from the core is integrally formed, and the upper surface of the end wall becomes deeper toward its center.
Are formed in the opposite conical surface, also in the barrier section, horizontal hole which is open to expansion chamber extending from the longitudinal bore laterally said inverted cone
It is characterized by being drilled along the generatrix of the surface .

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

First, in FIGS. 1 and 2, a reservoir R for storing hydraulic oil is provided on a brake master cylinder M of an automobile. The injection of the working oil into the reservoir R is performed from an oil supply port tube 1 protruding above the reservoir R, and the oil supply port tube 1 is usually closed by a cap C.

The cap C is composed of a cap body 2 made of an elastic material such as rubber and an air passage 3 made of synthetic resin. The cap body 2 has a cup-shaped cover lid 4 having a sealing surface 4a that is in close contact with the upper end surface of the fuel filler cylinder 1, and is integrally protruded from the lower surface of the cover lid 4 to closely contact the inner peripheral surface of the fuel filler cylinder 1. It comprises an annular seal lip 5 and a mounting cylinder 6 for the ventilation passage body 3 which is also provided on the inside of the seal lip 5 and also integrally with the lower surface of the cover 4, and is provided at the center of the cover 4. A vent hole 8 is formed to communicate an expansion chamber 7 (described later) defined inside the mounting cylinder 6 to the outside. An annular mounting groove 9 is formed on the inner peripheral surface of the mounting cylinder 6.

On the other hand, the air passage body 3 is integrally formed as a single component from a synthetic resin. As shown in FIGS. 2 to 4, the outer peripheral portion 10a has a flange-shaped end wall 10a.
Of the body 11, the upper surface of which is closed, a ventilation tube 12 hanging down from the center of the end wall 10 below the body 11, and a vertical hole 13 penetrating through the center of the ventilation tube 12 and the end wall 10. And a barrier portion (14) protruding from the center of the upper surface of the end wall (10) so as to cover the upper open end. The upper surface of the end wall 10 is formed as an inverted conical surface 15 that becomes deeper toward the center thereof,
A plurality of horizontal holes 16 communicating the vertical holes 13 to the outside of the barrier portion 14 are formed in the barrier portion 14 along the generatrix of the inverted conical surface 15.

The end wall 10 is integrally formed with a guide cylinder 17 projecting from the upper surface thereof. The guide cylinder 17 has a cutout for allowing the core pin for forming the horizontal hole 16 to be installed. 18 are provided.

Further, a radial rib 19 connecting the body 11 and the ventilation tube 12 is formed integrally therewith.

The air passage body 3 thus configured is fitted into the mounting tube 6 of the cap body 2 with the guide tube portion 17 at the top while expanding the lower end opening, and the flange-like end wall 10 is formed. The outer peripheral portion 10 a is elastically fitted into the mounting groove 9, thereby being mounted on the mounting cylinder 6. Thus, the expansion chamber 7 is defined in the mounting cylinder 6 by the inverted conical surface 15 of the end wall 10.

In FIG. 1, reference numeral 20 denotes a reservoir R
Shows the hydraulic oil stored in.

Next, the operation of this embodiment will be described.

When the cap C is mounted on the fuel filler cylinder 1, the sealing surface 4a of the cap body 2 is elastically close to the upper end face of the fuel filler cylinder 1, and the seal lip 5 is elastically close to the inner peripheral surface of the fuel filler cylinder 1. Therefore, it is possible to prevent the hydraulic oil in the reservoir R from leaking from the oil supply port cylinder 1.

The upper space inside the reservoir R communicates with the atmosphere through the vertical holes 13 and the horizontal holes 16 of the ventilation passage body 3 and the expansion chamber 7 and the ventilation holes 8 of the cap body 2, so that the inside of the reservoir R is always in the reservoir R. Maintained at the atmospheric pressure, the supply of the hydraulic oil from the reservoir R to the master cylinder M can always be performed smoothly.

Even if the hydraulic oil 20 in the reservoir R undulates due to vibrations of the vehicle and a part of the oil enters the vertical hole 13 of the ventilation passage body 3 and rises swiftly, the oil does not pass through the barrier portion 14. , And flows down the vertical hole 13. Also, if the barrier portion 14
If the oil that hits the air flow excessively turns the course toward the lateral hole 16, the damping will be further increased. Therefore, even if the oil flows out of the lateral hole 16 into the expansion chamber 7, the upper ventilation hole 8 cannot be reached. Then, the oil that has lost its momentum in the expansion chamber 7 goes down the inverted conical surface 15, enters the horizontal hole 16 again, flows down the vertical hole 13, and returns into the reservoir R. In this way, it is possible to prevent the wavy hydraulic oil in the reservoir R from leaking out of the ventilation hole 8 by the ventilation path body 3.

The body 1 having the inverted conical surface 15
1, a ventilation tube 12 having a vertical hole 13 and a ventilation passage 3 provided with a barrier portion 14 having a horizontal hole 16 are integrally formed as one piece with a synthetic resin, and this is elastically attached to the mounting cylinder 6 of the cap body 2. Since the cap C is formed by merely fitting the cap C, the cap C has a small number of parts and is extremely easy to assemble.

[0019]

As described above, according to the present invention, there is provided a cap body having an end wall defining an expansion chamber in a mounting cylinder and a body fitted into the mounting cylinder and a lower surface of the end wall. a vent tube extending downward, integrally formed venting passage body comprising a barrier portion for raised from the upper surface center portion of the end wall to cover the upper open end of the vertical hole penetrating the vent tube and said end wall, said end The top of the wall is
It is formed on an inverted conical surface that becomes deeper toward its center.
In the barrier portion, a horizontal hole extending laterally from the vertical hole and opening to the expansion chamber is formed along the generating line of the inverted conical surface.
When the stored liquid in the reservoir rises, even if the liquid vigorously rises in the vertical hole, it can be effectively attenuated by the barrier portion and the horizontal hole to prevent leakage from the vent hole. If the oil hitting the barrier is too strong,
Oil that has lost momentum in the expansion chamber,
Down the inverted conical surface, enter the horizontal hole again, and through the vertical hole, the reservoir
It is easily moved back into the cap body
It is possible to avoid a reduction in reservoir oil storage due to oil stagnation.
Wear. Moreover, since the air passage having the vertical hole, the horizontal hole, and the barrier portion is an integrally molded product, the number of components of the cap can be reduced, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal side view of a reservoir for a master cylinder equipped with a cap of the present invention.

FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 1;

FIG. 3 is a view taken in the direction of arrow 3 in FIG. 2;

FIG. 4 is a view taken in the direction of arrow 4 in FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Refueling port cylinder 2 Cap main body 3 Ventilation path body 6 Mounting cylinder 7 Expansion chamber 8 Vent hole 10 End wall 11 Body 12 Vent cylinder 13 Vertical hole 14 Barrier part 15 Reverse conical surface 16 Side hole C Cap R Reservoir

Claims (1)

(57) [Scope of request for utility model registration] 1. A cap body (2) mounted on a fuel filler cylinder (1) of a reservoir (R), and a mounting cylinder (2) formed on the cap body (2) so as to protrude into the fuel filler cylinder (1). 6)
And a ventilation path body (3) defining an expansion chamber (7) in the mounting cylinder (6), and a vent hole (3) in the cap body (2) for communicating the expansion chamber (7) to the outside. 8), while
A reservoir cap in which a ventilation hole (3) is provided with a vertical hole (13) communicating the inside of a reservoir (R) with an expansion chamber (7), wherein an expansion chamber is provided in a mounting cylinder (6) of a cap body (2). A body (11) having an end wall (10) defining (7) and fitted into the mounting tube (6); a ventilation tube (12) hanging down from the lower surface of the end wall (10); Ventilation comprising a ventilation tube (12) and a barrier (14) rising from the center of the upper surface of the end wall (10) to cover the upper opening end of a vertical hole (13) penetrating the end wall (10). integrally molded Michitai (3), an upper surface of the end wall (10) is deeper toward the center thereof
Inverted conical surface (15) is formed on, and the barrier portion (14), vertical hole (13) from extending laterally open to the expansion chamber (7) transverse hole (16) is the inverse comprising Conical surface (1
5) A cap for a reservoir, which is formed along the generatrix .