JPH059588Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an orifice device used in a hydraulic circuit such as an anti-skid control device of an automobile.

(Prior Art) Generally, when a wheel skids, an anti-skid brake control device for an automobile releases the brake fluid in the wheel cylinder to a sump device to reduce the brake fluid pressure in the wheel cylinder to eliminate the skid. After that, when the wheel skidding is resolved, the brake fluid pressure in the wheel cylinder is increased again.

By the way, in order to prevent the wheels from skidding, it is necessary to appropriately control the brake fluid pressure in the wheel cylinders, and one of the means for controlling this brake fluid pressure is an orifice device. be. This orifice device is generally incorporated into a brake fluid pressure circuit, and controls the flow rate of brake fluid supplied to the wheel cylinders or the flow rate of brake fluid discharged from the wheel cylinders.

As shown in FIG. 3, such an orifice device includes a cylindrical orifice body 03 in which an axial orifice hole 01 and a radial hole 02 that communicates almost orthogonally with the orifice hole 01 are bored.
An orifice device 04 consisting of the following is known. This orifice device 04 is, for example, a hydraulic pressure control device 05.
is incorporated into the hydraulic fluid passage 06 of the hydraulic fluid passage 06 to limit the flow rate of the hydraulic fluid flowing through the hydraulic fluid passage 06.

(Problem to be solved by the invention) However, in such an orifice device 04, if the orifice device 04 is arranged with the hydraulic fluid passage 06 and the radial hole 02 shifted in vertical position, as shown in FIG. Hydraulic fluid passage 06 and hole 02
A step 07 is created between the two.

When such a step 07 occurs, this step 07
Air mixed in the hydraulic fluid tends to collect, resulting in an air pocket 08. The air in this air reservoir 08 is difficult to move toward the hole 02 and the orifice hole 01 because of the step 07. For this reason, there is a problem that air cannot be removed efficiently.

Therefore, the orifice device 04 is replaced by the hydraulic pressure control device 0.
When it is installed in the hydraulic fluid passage 06 of No. 5, it is necessary to make sure that there is not much difference in the vertical position between the hydraulic fluid passage 06 and the hole 02 of the orifice body 03. For this reason, restrictions arise in the arrangement of the hole 02 with respect to the hydraulic fluid passage 01.

The present invention was developed in view of these problems, and its purpose is to provide an orifice device that allows orifice holes to be freely provided and that also allows air to be efficiently and reliably removed. It is to provide.

(Means for Solving the Problem) In order to solve this problem, the present invention provides a hydraulic device body in which an orifice hole is bored and a hydraulic fluid path that bypasses the orifice hole. The air bleeder valve is characterized by forming an air bleeder valve that communicates with and shuts off communication between the air bleed hole and the air bleed hole.

(Function) In the orifice device having the air bleeder function according to the present invention having such a configuration, the orifice body is moved and set so that the air bleeder valve is opened when air is removed. This forms a large hydraulic fluid flow path that bypasses the orifice hole, so that air in the hydraulic fluid can easily move toward the air bleeder hole.

Furthermore, if the orifice body is set so that the air bleeder valve is closed, the hydraulic fluid passage will communicate only through the orifice hole. The orifice device therefore limits the flow of hydraulic fluid.

(Example) Hereinafter, an example of the present invention will be described using the drawings.

FIG. 1 is a sectional view partially showing an embodiment of an orifice device having an air bleeder function according to the present invention, which is incorporated into a hydraulic device.

As shown in FIG. 1A, an orifice device 3 is disposed in a hydraulic fluid passage 2 of a main body 1 of the hydraulic device. This orifice device 3 includes a bolt-shaped orifice body 4.

As shown in FIG. 2, the tip of this orifice body 4 is formed into a conical surface 4a. Further, an axial orifice hole 4b and a radial hole 4c perpendicular to the orifice hole 4b are bored at the tip of the orifice body 4. Further, a male threaded portion 4d is formed in the lower part of the orifice body 4, and the lower end thereof has the same shape as the bolt head.

As is clear from FIG. 1A, the orifice main body 4 configured in this manner has a large diameter hole 5 formed in the hydraulic device main body 1 and communicating with the hydraulic fluid passage 2, which is fluid-tight with an O-ring 6. At the same time, it is screwed into a female threaded portion 5a formed at the open end of this large diameter hole 5. In the state shown in FIG. A, the orifice body 4 has a conical surface 4a at the tip thereof connected to the large diameter hole 5 of the hydraulic device body 1 and the hydraulic fluid passage 2.
It is in a state where it is in contact with the stepped portion 1a between.
When this conical surface 4a is in contact with the stepped portion 1a,
The hydraulic fluid passage 2 is communicated only through the orifice hole 4b.

On the other hand, in the state shown in Figure B, the orifice main body 4 is rotated and lowered, so that the conical surface 4a is separated from the step portion 1a. When the conical surface 4a is separated from the stepped portion 1a, a relatively large passage 7 is formed between the conical surface 4a and the stepped portion 1a. Therefore, this passage 7 allows the hydraulic fluid passage 2 to communicate with the passage 7 bypassing the orifice hole 4b.

That is, the tip of the orifice body 4 and the stepped portion 1a of the hydraulic device body 1 constitute a valve that directly communicates and shuts off the working fluid passage 2 by bypassing the orifice hole 4b.

The hydraulic fluid passage 2 communicates with, for example, a check valve 8 built into the hydraulic device main body 1.

Next, the operation of the embodiment configured as described above will be explained.

As shown in FIG. 1A, when the orifice body 4 is screwed in and its conical surface 4a comes into contact with the step 1a, no passage is formed between the conical surface 4a and the step 1a, so the hydraulic fluid path 2 is orifice hole 4b
Communication is only possible through this. Therefore,
The hydraulic fluid flowing through the hydraulic fluid passage 2 is constricted by a predetermined amount by the orifice hole 4b. Thereby, the orifice device 3 can reliably exhibit the orifice effect.

Further, when the orifice main body 4 is rotated in the opposite direction and lowered, the conical surface 4a is separated from the stepped portion 1a, as shown in FIG. As a result, a passage 7 having a relatively large cross-sectional area is provided between the conical surface 4a and the step portion 1a.
is formed. Therefore, a large amount of hydraulic fluid primarily flows from this passage 7 as shown by the arrow. Therefore, the orifice effect of the orifice device 3 is almost eliminated.

When venting air, as shown in FIG. 1B, if the orifice body 4 is lowered to form a large passage 7 between the conical surface 4a and the section 11a, the air in the hydraulic fluid will flow through this passage 7. through the air bleeder hole 2a. Therefore, the tip of the orifice body 4 and the stepped portion 1a
The valve formed by and constitutes the air bleeder valve of the present invention, and the orifice device 3 has an air bleeder function due to this air bleeder valve.

In the orifice device of this embodiment configured in this way, air accumulates in a large step created between the hydraulic fluid passage 2 and the hole 4c due to a considerable vertical position shift between the hydraulic fluid passage 2 and the hole 4c. Even if this occurs, by opening the air bleeder valve and forming the passage 7 when air is removed, the air can smoothly move toward the air bleeder hole 2a. Therefore, air can be efficiently and almost completely removed.

Moreover, since the hydraulic fluid passage 2 and the passage 4c can be arranged with a considerable vertical position shift, the degree of freedom in setting the arrangement of the passage 4c is extremely increased. Therefore, the design of the orifice device becomes easier.

(Effects of the Invention) As is clear from the above description, the orifice device of the present invention has an air bleeder function, so that air can be removed efficiently and reliably. Therefore, the air bleed performance is improved and the air bleed work becomes extremely easy.

Further, even if the passage formed in the orifice body is disposed with a considerable deviation in the vertical direction from the hydraulic fluid passage, air can be reliably removed, which increases the degree of freedom in arranging the passage. Therefore, the design of the orifice body becomes easy.

[Brief explanation of the drawing]

Fig. 1 partially shows a hydraulic device in which an embodiment of the orifice device according to the present invention is assembled, A is a cross-sectional view showing the state where the air bleeder valve is closed, and B is a sectional view.
2 is a sectional view showing the air bleeder valve in an open state, FIG. 2 is a front view of the orifice body of the orifice device, and FIG. 3 is a sectional view partially showing the conventional orifice device. DESCRIPTION OF SYMBOLS 1... Hydraulic pressure device, 1a... Step part, 2... Working fluid passage, 3... Orifice device, 4... Orifice body, 4a... Conical surface, 4b... Orifice hole,
4c...Radial hole.

Claims (1)

[Claims for Utility Model Registration] An orifice device provided with an orifice body provided in a working fluid passage of a hydraulic device and having an orifice hole bored therein, which comprises: An orifice device equipped with an air bleeder, characterized in that an air bleeder valve is formed to bypass the orifice hole and communicate and cut off the working fluid passage and the air bleed hole.