JPH0727241A - Air bleeding device - Google Patents

Abstract

PURPOSE:To enable air to escape outside only by thread cutting without providing an adjusting screw with a lateral hole and a center hole. CONSTITUTION:Either one of a female screw on the inner surface of a threaded hole 5 provided at the opening part of a passage 4 communicated with a chamber where air is to be discharged and a male screw on the outer face of an adjusting screw 6 is formed into a multiple thread screw with only one thread screwed with the other screw. An air bleeding spiral passage 12 is thereby formed of the remaining threads, not screwed with the other screw, of the multiple thread screw, so that there is no need to apply boring or the like to the adjusting screw 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air bleeding device,
For example, the present invention relates to an air bleeding device suitable for use as a bleeder for bleeding air generated in a wheel cylinder used for a hydraulic brake of an automobile.

[0002]

2. Description of the Related Art Conventional bleeders for wheel cylinders used for hydraulic brakes of automobiles include those shown in FIGS. 3 and 4, for example.

In the figure, (01) is a wheel cylinder,
(02) is the cylindrical cylinder body.

In the cylinder body (02), the brake fluid (03)
Is filled, and the hydraulic pressure allows a piston (not shown) slidably fitted in the cylinder body (02) to be pushed out to operate the brake.

A passage (04) is provided in the upper portion of the cylinder body (02) to connect the inside and outside of the cylinder body (02). A screw hole (05), which is connected to the outside of the cylinder body and has a diameter larger than that of the passage (04), is provided at the opening of the passage (04). An adjusting screw (06) is screwed into the screw hole (05).

A pointed taper surface (06a) is formed at the tip of the adjusting screw (06), and when the adjusting screw (06) is screwed in, the tapered surface (06a) has a small diameter passage (04). (07) formed by the step between the large diameter screw hole (05) and
The passage (04) is blocked when it comes into close contact with.

A pair of lateral holes (08) are formed on the outer periphery of the adjusting screw (06) near the tip, and the lateral holes (08) face inward.
Communicates with a central hole (09) having a rear end opened at the center of the adjusting screw (06).

Therefore, as shown in FIG.
By slightly returning (06) from the fully closed state and opening the gate (07), the air accumulated in the upper part of the cylinder main body (02) is passed through the passage (04) and the adjusting screw ( 06) horizontal hole (0
8) and the central hole (09) can be successively passed through to escape to the outside, and it is possible to prevent a reduction in the operating force of the brake or the like due to the accumulation of air in the cylinder body (02).

[0009]

In the conventional device as described above, the lateral hole (08) and the central hole (09) must be bored in the adjusting screw (06), and the adjusting screw (06) is required. ) Itself is small, it takes time and labor to drill them, resulting in an increase in manufacturing cost.

The present invention has been made to solve the above-mentioned problems, and it is possible to provide the adjusting screw without a lateral hole or a central hole.
It is an object of the present invention to provide an air bleeding device that allows air to escape to the outside only by ordinary screw processing.

[0011]

In order to achieve the above object, the present invention provides a screw hole at an opening of a passage communicating with a room from which air is to be released, and opens and closes the passage in the screw hole. In the air bleeding device in which the adjusting screw is screwed, one of the female screw on the inner surface of the screw hole and the male screw on the outer surface of the adjusting screw is a multi-thread screw in which only one thread is screwed with the other thread. As a feature, it is intended to solve the above problems.

[0012]

In the present invention, only one of the female screw on the inner surface of the screw hole provided at the opening of the passage communicating with the room from which air is to be released and the male screw on the outer surface of the adjusting screw is screwed into the other screw. Since the multi-thread screw is used, the remaining thread of the multi-thread screw that is not screwed with the other thread forms a spiral passage for air bleeding, and it is not necessary to make holes in the adjusting screw.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS. It should be noted that the same members as those described in the conventional example are denoted by reference numerals other than (0), and detailed description thereof will be omitted.

In this embodiment, a screw hole (5) having a diameter larger than the inner diameter of the passage (4) is provided at the opening of the passage (4) communicating with the cylinder body (2) which is the chamber from which air is to be released. ),
The female screw (10) of the screw hole (5) is a two-thread screw having two parallel spiral grooves (10a) (10b) and a male screw (11) formed on the outer surface of the adjusting screw (6). ) To the female screw (1
It is a single thread screw that is screwed into only one groove (10a) of (0).

That is, the pitch (P1) and groove depth (D) of the internal thread (10) are compared with the pitch (P2) and groove depth of the external thread (11).
(D) is half the pitch (P2) of the external thread (11) and the height (H) of the crest, and each groove (10a) of the internal thread (10).
The lead of (10b) is the same as the lead of the male screw (11).

With such a structure, between the groove (10b), which is not screwed with the male screw (11) of the female screw (10), and the valley of the male screw (11), a spiral shape with a rhombic cross section is formed. A passageway (12) is formed.

Therefore, when the adjusting screw (6) is slightly unscrewed from the fully closed state as shown in FIG. 1 and the gate (7) is slightly opened as shown in FIG.
The air accumulated in the upper part of (2) passes through the passage (4) to the gate (7).
Also, it can escape to the outside by sequentially passing through the spiral passage (12).

The female screw (10) is not limited to a two-start screw, but may be a multi-start screw having three or more turns, and one of the spiral groove may be screwed onto the male screw (11). Good.

Further, the female screw (10) is a single thread screw, and a male screw
Even if (11) is a multi-thread screw and one thread is screwed into the female screw (10), the same action and effect can be obtained.

Further, the present invention is not limited to the above specific use, but can be applied to, for example, an air bleeding device for a tank.

According to the present invention, since it is not necessary to drill a central hole or a lateral hole inside the adjusting screw as in the conventional case, the processing is facilitated and the manufacturing cost can be reduced accordingly. .

[0022]

The present invention has the following effects. (a) Since it is not necessary to drill a central hole or a lateral hole inside the adjusting screw to let air escape to the outside, it is easy to process that much, and it is possible to manufacture by simply screwing.
The manufacturing cost can be remarkably reduced as compared with the conventional one.

[Brief description of drawings]

FIG. 1 is an enlarged vertical cross-sectional side view of a main part when fully closed according to an embodiment of the present invention.

FIG. 2 is an enlarged vertical cross-sectional side view of the main part when air is removed.

FIG. 3 is a vertical sectional side view showing an example of a conventional air bleeding device.

FIG. 4 is also an enlarged vertical side view of the main part.

[Explanation of symbols]

(1) Oil cylinder (2)
Cylinder body (3) Brake fluid (4)
Passage (5) Screw hole (6)
Adjustment screw (6a) Tapered surface (7)
Gate (8) Side hole (9)
Central hole (10) Female thread (10
a) (10b) spiral groove (11) male screw (12)
Passage (P1) (P2) Pitch (D)
Groove depth (H) Mountain height

Claims (2)

[Claims] 1. An air bleeding device in which a screw hole is provided in an opening of a passage communicating with a room from which air is to be evacuated, and an adjusting screw for opening and closing the passage is screwed into the screw hole. 2. An air bleeding device, characterized in that either one of the female screw and the external screw of the adjusting screw is a multi-thread screw in which only one thread is screwed with the other thread. 2. A taper surface is formed at the tip of the adjusting screw,
2. The air bleeding device according to claim 1, wherein the taper surface is brought into close contact with a gate portion formed in the middle of the passage to block the passage by screwing an adjusting screw into the screw hole.