JPH0637040U - Reservoir cap - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a structure with a small number of parts in a cap provided on a fuel filler cylinder of a reservoir so that the stored liquid in the reservoir does not leak from a vent hole even when it is wavy. A body portion 11 having an end wall 10 facing the expansion chamber 7 communicating with the ventilation passage body 3 fitted into the mounting cylinder 6 of the cap main body 2 to the outside through a ventilation hole 8 in the mounting cylinder 6. , End wall 1
It is composed of a through-cylinder 12 extending downward from 0 and a barrier portion 14 covering an upper opening end of a vertical hole 13 penetrating the through-cylinder 12 and the end wall 10, and is integrally molded with a synthetic resin to form a barrier portion. A horizontal hole 1 extends from the vertical hole 13 to the expansion chamber 7 at 14.
6 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cap for a reservoir that stores hydraulic oil of hydraulic equipment such as a master cylinder, and more particularly, to a cap body that is attached to a fuel filler tube of the reservoir and a cap body that protrudes into the fuel filler tube. The cap body is provided with a vent hole that connects the expansion chamber to the outside, and the cap body is provided with a vent hole that communicates with the outside of the expansion chamber. The present invention relates to an improvement provided with a vertical hole communicating with the expansion chamber.

[0002]

[Prior art]

 Conventionally, in this type of reservoir cap, when the stored liquid in the reservoir swells, in order to prevent the rising liquid from entering the vertical hole of the air passage to prevent leakage from the air hole of the cap body, It is known that a barrier plate that covers the upper open end of the vertical hole is fitted to the ventilation passage body (see, for example, Japanese Utility Model Laid-Open No. 58-168956).

[0003]

[Problems to be solved by the device]

 In the above-described conventional structure, since the separate barrier plate is fitted to the ventilation passage body, the number of parts is increased and the cost is inevitably high. In addition, it is necessary to provide a small hole for communicating the vertical hole with the expansion chamber in the barrier plate, but since the barrier plate is thin, the above small hole is extremely shallow, and therefore the liquid stored in the reservoir is corrugated. When standing up, there is a risk that the strong liquid that has risen up the vertical holes easily passes through the small holes, reaches the ventilation holes of the cap body, and leaks to the outside from there.

The present invention has been made in view of such circumstances, has a small number of parts, has a simple structure, and can effectively prevent leakage of liquid from the vent hole of the cap body. The purpose is to provide.

[0005]

[Means for Solving the Problems] To achieve the above object, the present invention provides a body part having an end wall defining an expansion chamber in a mounting body of a cap body and fitted to the mounting body. An integrally formed vent passage body is formed of a ventilation cylinder that hangs from the lower surface of the end wall and a barrier portion that rises from the upper surface of the end wall to cover the upper opening end of a vertical hole that penetrates the communication cylinder and the end wall. The barrier portion is characterized by having a lateral hole extending laterally from the vertical hole and opening to the expansion chamber.

[0006]

【Example】

 An 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 the hydraulic oil is provided on a brake master cylinder M of an automobile. The injection of hydraulic oil into the reservoir R is performed from the oil supply port cylinder 1 provided on the upper portion of the reservoir R, and the oil supply port cylinder 1 is normally closed by the cap C.

The cap C is composed of a cap body 2 made of an elastic material such as rubber and a ventilation passage body 3 made of synthetic resin. The cap body 2 has a cup-shaped cover lid portion 4 having a seal surface 4a that is in close contact with the upper end surface of the fuel filler cylinder 1, and a projection integrally formed on the lower surface of the cover lid 4 to cover the inner peripheral surface of the fuel filler cylinder 1. It is composed of an intimate annular seal lip 5 and an attachment tube 6 for the ventilation passage body 3 which is also integrally projecting inside the seal lip 5 on the lower surface of the cover lid portion 4, and the center of the cover lid portion 4 is formed. The portion is provided with a vent hole 8 for communicating an expansion chamber 7 (described later) defined in 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 molded of a synthetic resin as a single component, and as shown in FIGS. 2 to 4, the outer peripheral portion 10 a has an upper surface formed by a flange-shaped end wall 10. The body portion 11 having a closed body, the through cylinder 12 that hangs downward from the center portion of the end wall 10 below the body portion 11, and the upper portion of the vertical hole 13 that passes through the through cylinder 12 and the center portion of the end wall 10. A barrier portion 14 is provided so as to cover the opening end and rise from the center of the upper surface of the end wall 10. The upper surface of the end wall 10 is formed as an inverted conical surface 15 that becomes deeper toward the center thereof, and the barrier portion 14 has a plurality of horizontal holes 16 that connect the vertical holes 13 to the outside of the barrier portion 14. The holes are formed along the generatrix of the inverted conical surface 15.

A guide cylinder portion 17 protruding from the upper surface of the end wall 10 is formed integrally with the end wall 10. The guide cylinder portion 17 allows installation of a core pin for forming the lateral hole 16. A cutout 18 is provided.

Further, the body 11 and the through-cylinder 12 are integrally formed with radial ribs 19 connecting them.

The air passage body 3 configured as described above is fitted into the mounting cylinder 6 of the cap body 2 with the guide cylinder portion 17 at the beginning while expanding the lower end opening portion thereof, and the flange of the end wall 10 is fitted. It is mounted on the mounting cylinder 6 by elastically fitting the j-shaped outer peripheral portion 10 a into the mounting groove 9. 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 indicates hydraulic oil stored in the reservoir R.

Next, the operation of this embodiment will be described.

When the cap C is attached to the filler cylinder 1, the sealing surface 4a of the cap body 2 elastically and closely contacts the upper end surface of the filler cylinder 1, and the seal lip 5 elastically closely contacts the inner peripheral surface of the filler cylinder 1. Therefore, it is possible to prevent the hydraulic oil in the reservoir R from leaking out from the filler neck 1.

Further, since the upper space in the reservoir R communicates with the atmosphere through the vertical hole 13 and the horizontal hole 16 of the ventilation path body 3, and the expansion chamber 7 and the ventilation hole 8 of the cap body 2, the inside of the reservoir R Is always maintained at the atmospheric pressure, and the hydraulic oil can be smoothly supplied from the reservoir R to the master cylinder M.

Even if a part of the oil enters the vertical hole 13 of the air passage body 3 and vigorously rises due to the vibration of the hydraulic oil 20 in the reservoir R caused by the vibration of the vehicle or the like, the oil remains in the barrier portion 14. When it hits, the vertical hole 13 flows down. Further, if the oil hitting the barrier portion 14 is excessively forced and the path is sharply bent toward the lateral hole 16, a larger amount of damping will occur, so that the oil will flow out of the lateral hole 16 into the expansion chamber 7. However, the upper vent hole 8 cannot be reached. Then, the oil that lost its momentum in the expansion chamber 7 descends from 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, the vent passage body 3 can prevent the wavy hydraulic oil in the reservoir R 2 from leaking from the vent hole 8.

By the way, the air passage body 3 including the body portion 11 having the inverted conical surface 15, the through cylinder 12 having the vertical hole 13, and the barrier portion 14 having the horizontal hole 16 is integrally made of synthetic resin as one component. Since the cap C is formed by molding and elastically fitting it into the mounting cylinder 6 of the cap body 2, the cap C has a small number of parts and is extremely easy to assemble.

[0019]

[Effect of device]

 As described above, according to the present invention, a body portion having an end wall defining an expansion chamber in the mounting cylinder of the cap body and fitted into the mounting cylinder, and a through cylinder hanging from the lower surface of the end wall. An integrally formed vent passage body is composed of the through-cylinder and a barrier portion protruding from the upper surface of the end wall so as to cover the upper opening end of the vertical hole penetrating the end wall. Since a horizontal hole that extends in the horizontal direction and opens to the expansion chamber is provided, even if the stored liquid in the reservoir swells up the vertical hole vigorously, it can be effectively protected by the barrier and horizontal hole. Attenuation can be prevented to prevent leakage from the ventilation holes, and since the ventilation passage body having the vertical holes, the horizontal holes, and the barrier portion is an integrally molded product, the number of cap parts can be reduced. The cost can be reduced.

[Brief description of drawings]

FIG. 1 is a side view, partly in longitudinal section, of a master cylinder reservoir equipped with a cap of the present invention.

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

FIG. 3 is a view on arrow 3 of FIG.

FIG. 4 is a view on arrow 4 of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fuel filler cylinder 2 Cap body 3 Ventilation body 6 Mounting cylinder 7 Expansion chamber 8 Vent hole 10 End wall 11 Body part 12 Through cylinder 13 Vertical hole 14 Barrier part 16 Horizontal hole C Cap R Reservoir

Claims (1)

[Scope of utility model registration request] 1. A cap body (2) mounted on a fuel filler tube (1) of a reservoir (R), and a mounting barrel (2) formed on the cap body (2) so as to project into the fuel filler tube (1). 6)
And a vent passage body (3) which is fitted into the mounting cylinder (6) to define an expansion chamber (7) in the mounting cylinder (6), and the cap body (2) communicates the expansion chamber (7) to the outside with a ventilation hole (3). While providing 8),
A reservoir cap having a vent hole body (3) provided with a vertical hole (13) for communicating the inside of the reservoir (R) with the expansion chamber (7). The expansion chamber is provided in the mounting cylinder (6) of the cap body (2). A body portion (11) fitted to the mounting cylinder (6) having an end wall (10) defining (7), a through cylinder (12) hanging from the lower surface of the end wall (10), An air passageway body (which includes the through-cylinder (12) and a barrier portion (14) protruding from the upper surface of the end wall (10) to cover the upper opening end of the vertical hole (13) penetrating the end wall (10) ( 3) is integrally molded, and the barrier part (1
4) A reservoir cap, characterized in that a lateral hole (16) extending laterally from the vertical hole (13) and opening to the expansion chamber (7) is provided.