JP2540382Y2 - Reservoir breather device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breather device for a reservoir for storing hydraulic oil for hydraulic equipment such as a brake master cylinder of an automobile.

[0002]

2. Description of the Related Art As a breather device for a vehicle reservoir,
For example, as disclosed in Japanese Utility Model Publication No. 37-16360, an expansion chamber is formed in a rubber cap attached to a filler port of a reservoir, and the expansion chamber is open to the atmosphere at the top and bottom walls thereof. It is known to provide an outer vent and an inner vent connected to the inside of the reservoir.

[0003]

In the conventional breather described above, when the oil level in the reservoir rises, the oil droplets rising from the outer ventilation holes are attenuated in the expansion chamber and leak out of the cap. However, if water splashes into the outside vent during car washing, there is a drawback that the water immediately enters the expansion chamber and enters the reservoir through the inside vent.

Accordingly, an object of the present invention is to provide a breather device for a reservoir having a simple structure capable of preventing both intrusion of water from the outside and leakage of oil from the inside.

[0005]

In order to achieve the above-mentioned object, the present invention provides a cap made of an elastic material which is mounted on a fuel filler cylinder of a reservoir, and a first annular seal which is in close contact with the upper face of the fuel filler cylinder. Portion, an annular second seal portion that is in close contact with the inner peripheral surface of the fuel filler tube, and a constricted portion defining an annular expansion chamber between the first and second seal portions and the inner peripheral surface of the fuel filler tube. And an annular groove surrounding the first seal portion, a first longitudinal groove communicating the annular groove with the atmosphere, and at least one of the opposing surfaces of the cap and the fuel filler cylinder. The first feature is that a lateral groove communicating the annular groove with the expansion chamber on the opposite side and a second vertical groove communicating the expansion chamber into the reservoir are provided.

The present invention has a second feature that, in addition to the above features, the annular groove is formed lower than the lateral groove.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

First, a first embodiment of the present invention shown in FIGS. 1 and 2 is started. In FIG. 1, a reservoir R for storing hydraulic oil to be replenished therein is provided above a brake master cylinder M of an automobile. This reservoir R is
An upper reservoir half 1 made of synthetic resin having a fuel supply port tube 3 projecting from the upper wall, and a lower reservoir half 2 made of synthetic resin having a connecting tube 4 fitted and connected to the master cylinder M projected from the bottom wall. Are welded to each other.

A flange 5 is formed on the outer periphery of the upper end portion of the fuel filler tube 3, and a cap C is mounted on the fuel filler tube 3 so as to embrace the flange 5. The cap C is formed of an elastic material such as rubber,
And an inner part 7 which projects downward from the center of the outer part 6 and is inserted into the fuel filler tube 3. The outer portion 6 includes an annular locking groove 10 with which the flange 5 is engaged, and the locking groove 1.
A tapered portion 11 that guides the flange 5 to zero and an annular first seal portion 12 that is in close contact with the upper end surface of the flange 5 are formed on the inner surface. Further, the lower end of the inner portion 7 is formed in a second seal portion 13 which is in close contact with the inner peripheral surface of the fuel filler tube 3, and a hollow portion 14 for imparting elasticity to the second seal portion 13 is formed in the inner portion 7. Open to the lower surface. Further, a constricted portion 16 defining an annular expansion chamber 15 is formed between the inner portion 7 and the inner peripheral surface of the fuel filler cylinder 3.

On the other hand, as shown in FIG. 2, a pair of first vertical grooves 17 for communicating between upper and lower surfaces of the flange 5 of the fuel filler cylinder 3 are provided on one side of the flange 5. Further, the flange 5 has an annular groove 18 communicating with the first vertical groove 17 and covered by the cap C, and a lateral groove 19 communicating the annular groove 18 with the expansion chamber 15 on the opposite side of the first vertical groove 17. Provided. In this case, the annular groove 18 is formed with a step below the lateral groove 19.

As shown in FIGS. 1 and 2, a second side of the oil supply port cylinder 3 is connected to the expansion chamber 15 in the reservoir R by bypassing the second seal portion 13 on the opposite side of the lateral groove 19. A vertical groove 20 is provided.

Next, the operation of this embodiment will be described.

The interior of the reservoir R is always in communication with the atmosphere through an air passage formed by the second vertical groove 20, the expansion chamber 15, the horizontal groove 19, the annular groove 18, and the first vertical groove 17, so that the reservoir R
When hydraulic oil is transferred between the master cylinder M and the master cylinder M, the inside of the reservoir R can breathe smoothly according to the rise and fall of the oil level in the reservoir R accompanying the transfer of hydraulic oil. Moreover, in the ventilation path, the first vertical groove 17 and the horizontal groove 19 communicate with the annular groove 18 at diametrically opposite positions with respect to the axis of the fuel filler cylinder 3, so that when the car is washed, water splashes from the first vertical groove 17. To annular groove 1
Even if it penetrates vigorously, the water pressure is sufficiently attenuated while flowing through the annular groove 18 toward the lateral groove 19. Moreover, since the annular groove 18 is one step lower than the lateral groove 19, even if water reaches the position of the lateral groove 19 of the annular groove 18, no water flows into the lateral groove 19. Then, the water whose pressure has been attenuated returns to the annular groove 18 and flows out of the first vertical groove 17 to the outside. Thus, it is possible to prevent water from entering the reservoir R.

On the other hand, due to the vibration applied to the reservoir R, the oil level inside the reservoir R vibrates violently, and
Even if the vertical groove 20 rises vigorously and enters the expansion chamber 15,
In the chamber 15, the pressure of the oil is damped. Moreover, the room 15
Since the horizontal groove 19 connected to the upper part of the second vertical groove occupies a position directly opposite to the second vertical groove 20 with respect to the axis of the oil supply port cylinder 3, the oil which has risen through the second vertical groove 20 does not reach the horizontal groove 19 immediately. . Then, the oil whose pressure has been attenuated in the expansion chamber 15 flows down the second vertical groove 20 and returns into the reservoir R. Thus, leakage of oil to the outside of the cap C can be prevented.

The first and second seal portions 12, 1
3. Since the constricted portion 16, the first and second vertical grooves 17, 20, the annular groove 18, and the horizontal groove 19 are formed at the same time as the formation of the reservoir R or the cap C, their formation is extremely easy.

FIG. 3 shows a second embodiment of the present invention.
The configuration is the same as that of the previous embodiment except that the first and second vertical grooves 17 and 20 and the horizontal groove 19 are provided on the cap C side. Assign a sign. In this embodiment, the same operation as in the previous embodiment can be produced.

[0017]

As described above, according to the first feature of the present invention, a cap made of an elastic material which is mounted on a fuel filler cylinder of a reservoir is provided with an annular first seal portion which is in close contact with an upper end face of the fuel filler cylinder. An annular second seal portion which is in close contact with the inner peripheral surface of the fuel filler cylinder; and a constricted portion defining an annular expansion chamber between the first and second seal portions and the inner peripheral surface of the fuel filler cylinder. And an annular groove surrounding the first seal portion, a first longitudinal groove communicating the annular groove with the atmosphere, and an opposite of the first longitudinal groove on at least one of the opposing surfaces of the cap and the fuel filler cylinder. The lateral groove connecting the annular groove to the expansion chamber on the side and the second vertical groove communicating the expansion chamber into the reservoir are provided, so that water splashing from the outside into the first vertical groove is attenuated by the annular groove. It can prevent intrusion into the expansion chamber and reduce oil splashes rising in the second flute in the reservoir. It is possible to prevent leakage into the annular groove and. Moreover, since the first and second seal portions, the constricted portion, the first and second vertical grooves, the annular groove and the horizontal groove can be formed simultaneously with the formation of the reservoir or the cap, the structure is simple, and the production is easy and inexpensive. Can be provided.

According to a second feature of the present invention, since the annular groove is formed lower than the lateral groove, even if water which has entered the annular groove from the outside flows to the lateral groove position, a step between the annular groove and the lateral groove is formed. Thereby, intrusion into the lateral groove can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a main part of a reservoir with a breather device, showing a first embodiment of the present invention.

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

FIG. 3 is a vertical cross-sectional view of a reservoir around a fuel filler cylinder, showing a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 3 refueling port cylinder 5 flange 12 first seal portion 13 second seal portion 15 expansion chamber 16 constricted portion 17 first vertical groove 18 annular groove 19 horizontal groove 20 second vertical groove C cap R reservoir

Claims (2)

(57) [Scope of request for utility model registration] An annular first seal portion (12), which is in close contact with an upper end surface of a fuel filler cylinder (3), is provided on a cap (C) made of an elastic material which is mounted on a fuel filler barrel (3) of a reservoir (R).
An annular second seal portion (13) that is in close contact with the inner peripheral surface of the fuel filler cylinder (3); and the first and second seal portions (12, 1).
A constriction (16) defining an annular expansion chamber (15) is provided between the inner peripheral surface of the fuel filler cylinder (3) and the inner peripheral surface of the cap (C). At least one of the opposing surfaces has an annular groove (1) surrounding the first seal portion (12).
8), a first longitudinal groove (17) communicating the annular groove (18) with the atmosphere, and an annular groove (18) communicating with the expansion chamber (15) on the opposite side of the first longitudinal groove (17). Lateral groove (19),
A breather device for a reservoir, comprising a second vertical groove (20) communicating the expansion chamber (15) into the reservoir (R). 2. A breather device for a reservoir according to claim 1, wherein the annular groove (18) is formed lower than the lateral groove (19).