JPH109097A - Air flow rate control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a plunger and a valve spring from being adhered with dust contained in air, and from being corroded as entirely as possible. SOLUTION: A valve chamber 8 including a valve hole 16 communicating an introduction passage 5 and a discharge passage 6 with each other, is provided for an air side valve main body 1, and a valve spring chamber 12 partitioned by a bulkhead 11 with respect to the valve chamber 8, is also provided. A plunger 27 capable of being moved by liquid pressure, is provided for a liquid pressure side valve main body 2 to be connected with the air side valve main body 1. A valve shaft 18 is provided, which is extended while being penetrated through the bulkhead 11 partitioning a space into the valve chamber 8 of the air side valve main body 1 and the valve spring chamber 12, and can be moved by the movement of the plunger 27. A valve shaft 18 is provided with a valve body 17 which opens/closes the valve hole 16 by the movement of the valve shaft 18. A valve spring 20 is provided for the inside of the valve spring chamber 12, which energizes the valve body 17 to the direction that the valve hole 16 is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air flow control valve, and more particularly to an air flow control valve capable of controlling an intake air amount of an intake system of an internal combustion engine.

[0002]

2. Description of the Related Art In an automobile equipped with a power steering device for obtaining a steering assisting force using a working liquid as a medium, when the power steering device is operated when the output of the internal combustion engine is low, most of the output of the internal combustion engine is pumped by a working fluid. , And there is a possibility that a sufficient output cannot be obtained.
Therefore, an air flow control valve is used to control the intake air amount of the intake system of the internal combustion engine in accordance with the pressure of the working liquid supplied to the power steering device, and to increase the output of the internal combustion engine for the operation of the power steering device. Is used.

As an air flow control valve of this type, for example, Japanese Utility Model Publication No. 3-14455 discloses a valve hole in which an air introduction passage and a discharge passage communicate with each other, a valve body for opening and closing the valve hole, Air having a valve spring for urging the valve body in the valve closing direction of the valve hole, opening and closing the valve body by a plunger responsive to hydraulic pressure, and controlling air flow guided from the introduction passage to the discharge passage. A flow control valve is disclosed.

[0004]

However, in the prior art, a valve spring, which is a normal body and biases the valve body in a valve closing direction, is housed in a valve chamber having a valve hole. At the same time, the plunger moves forward and backward toward the valve chamber. That is, the valve spring and the plunger are exposed to the air in the valve chamber.

By the way, the air guided from the introduction passage to the discharge passage contains blow-by gas of the internal combustion engine and may contain dust that could not be removed by the air cleaner.

As a result, dust adheres to the sliding portion of the plunger exposed to the air in the valve chamber, and rust is generated by blow-by gas. There is a possibility that it will be stable. Further, if dust adheres to the valve spring or rust occurs, the durability of the valve spring may be impaired.

[0007] The present invention has been devised in view of the above-mentioned conventional circumstances, and can prevent dust or rust from being attached to a plunger or a valve spring as much as possible, and provide stable control characteristics. And to provide an air flow control valve having excellent durability.

[0008]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a valve chamber having a valve hole which communicates an air introduction passage and an air discharge passage with each other, and the valve chamber is separated from the valve chamber by a partition wall. An air-side valve body having a partitioned valve spring chamber, a plunger provided in the hydraulic-side valve body connected to the air-side valve body, and movable in the axial direction by hydraulic pressure, and a valve of the air-side valve body A valve shaft that extends through a partition partitioning between the chamber and the valve spring chamber and is movable in the axial direction by the axial movement of the plunger; The valve body is configured to include a valve body that opens and closes a valve hole, and a valve spring that is disposed in the valve spring chamber and urges the valve body through the valve shaft in a valve closing direction of the valve hole.

According to a second aspect of the present invention, there is provided a seal member for sealing between a valve chamber defined by the partition and a valve spring chamber between the partition and the valve shaft having the structure of the first aspect. Is provided.

Here, the valve spring is separated from the valve chamber into which air is introduced by a partition wall (in the invention according to claim 2, the valve spring is partitioned by the partition wall and further formed by a seal member). The plunger is moved back and forth with respect to the valve spring chamber so as to operate a valve shaft extending through the partition wall. Therefore, the plunger and the valve spring are prevented from being exposed to the air guided from the introduction passage to the discharge passage.

Therefore, the plunger and the valve spring are
An air flow control valve that can prevent dust contained in the air from adhering and rust due to chemical substances in the air as much as possible, achieves stable control characteristics, and has excellent durability. can get.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings as an embodiment applied to an air flow control valve attached to a power steering device.

FIG. 1 is a sectional view of an air flow control valve showing an embodiment of the present invention. In the figure, 1 is an air-side valve body,
Reference numeral 2 denotes a hydraulic side valve main body.

The air-side valve body 1 is made of a synthetic resin material and includes a passage member 3 and a partition member 4. The passage member 3 has a passage portion 7 having an air introduction passage 5 and a discharge passage 6 formed therein, and a cylindrical portion 9 forming a valve chamber 8 in which the introduction passage 5 and the discharge passage 6 can communicate with each other. ing. The partition member 4 has a bottomed cylindrical shape as a whole, and has a flange 10 that extends radially outward at an open end 4 a, the bottom 11 of which faces the introduction passage 5 and the discharge passage 6. The cylindrical member 9 is inserted into the cylindrical portion 9 of the passage member 3 while being in contact with the opening end 9a. Thereby, the cylindrical inside of the partition member 4 is
Is defined by the bottom 11 with respect to the valve chamber 8 in the cylindrical portion 9. A valve spring chamber 12 is formed in the cylindrical interior of the partition member 4, and as a result, the air-side valve main body 1 is formed.
Further, a valve spring chamber 12 is formed which is partitioned from the valve chamber 8 by a partition (the bottom 11 of the partition member 4).

In the valve chamber 8, the interior of the valve chamber 8 is divided into a first valve chamber 13 on the introduction passage 5 side and a second valve chamber 1 on the discharge passage 6 side.
4 is provided, and the valve plate 15 is provided with a valve hole 16 communicating the first valve chamber 13 and the second valve chamber 14. Thus, the introduction passage 5 and the discharge passage 6 communicate with each other through the valve hole 16 in the valve chamber 8. The valve plate 15 is integrated with the bottom 11 of the partition member 4 at a part on the outer peripheral side.

Reference numeral 17 denotes a valve body for opening and closing the valve hole 16. The valve body 17 is made of a rubber material, a synthetic resin material, a metal material, or the like, and has an annular flat portion 17a in contact with the opening edge of the valve hole 16 and a cylinder inserted into the valve hole 16 as shown in FIG. And a mounting hole 17c for the flat portion 17a.
Is attached to the distal end 18a of the valve shaft 18. An axial slit 17d communicating with the inside and outside of the cylindrical portion 17b.
Are formed in two lines.

The valve shaft 18 extends through the bottom (partition) 11 of the partition member 4 into the valve spring chamber 12.
A flange 18c having an enlarged diameter is formed at the rear end 18b of the valve shaft 18, and an annular spring washer 19 is engaged with the flange 18c.

Reference numeral 20 denotes a valve spring disposed in the valve spring chamber 12. One end of the valve spring 20 is connected to the spring washer 1.
9, the other end is in contact with the bottom (partition) 11 of the partition member 4 via the spring washer 21, and constantly biases the valve element 17 in the valve closing direction of the valve hole 16 via the valve shaft 18. ing.

Reference numeral 22 denotes a bottom (partition) 11 of the partition member 4.
The seal member 22 manages the sealing between the valve chamber 8 and the valve spring chamber 12 defined by the bottom (partition) 11 of the partition member 4.

The hydraulic side valve main body 2 is formed of a metal material, and has a shaft portion 23 and a cylindrical portion 24 whose diameter is enlarged. The hydraulic-side valve body 2 is connected to the air-side valve body 1 by caulking and fixing the distal end 24 a of the cylindrical portion 24 to the outer periphery of the cylindrical portion 9 of the passage member 3. The shaft portion 23 of the hydraulic valve body 2 has a screw 2
5 is formed and can be screwed to a hydraulic device of a power steering device (not shown). An axial cylinder hole 26 is formed through the shaft portion 23. In addition,
The outer peripheral shape of the cylindrical portion 24 is formed in a hexagonal shape in order to facilitate the work of screwing the hydraulic side valve body 2 to the hydraulic device by using an appropriate tool.

A plunger 27 is slidably housed in the cylinder hole 26 of the hydraulic valve body 2. One end 27a of the plunger 27 is connected to the rear end 18 of the valve shaft 18.
b, and the other end 27b protrudes from the inside of the cylinder hole 26. When the hydraulic pressure (hydraulic pressure) of the hydraulic device of the power steering device (not shown) acts on the other end 27b, an axial direction is generated according to the hydraulic pressure. Can be moved to A snap ring 28 is provided at the other end 27b of the plunger 27, and the snap ring 28
7 functions as a stopper mechanism that regulates the amount of movement toward the valve spring chamber 12 side. A seal member 29 is provided on the outer periphery of the plunger 27.

Reference numeral 30 denotes a bottomed cylindrical protective cap attached to the tip of the shaft portion 23 of the hydraulic valve body 2. A through hole 31 is formed at the bottom of the protective cap 30.
The hydraulic pressure of a power steering device (not shown) is guided through the through hole 31.

Reference numeral 32 denotes a seal ring disposed on the outer periphery of the shaft portion 23 of the hydraulic side valve main body 2.
When the hydraulic valve body 2 is attached to a hydraulic device of a power steering device (not shown), the liquid tight sealing between the hydraulic valve body 2 and the hydraulic device is performed.

Reference numeral 33 denotes a seal ring provided on the valve plate 15 for controlling the sealing between the first valve chamber 13 and the second valve chamber 14. Reference numeral 34 denotes an open end 9 of the passage member 3.
This is a seal ring for sealing between a and the flange 10 of the partition member 4 and between the inner periphery of the cylindrical portion 24 of the hydraulic valve body 2.

The air flow control valve having such a configuration is used by attaching a hydraulic side valve main body 2 integrally connected to an air side valve main body 1 to a hydraulic device of a power steering device (not shown).

When the hydraulic pressure of the hydraulic device of the power steering device (not shown) is zero or low pressure and the hydraulic pressure acting on the plunger 27 is lower than a predetermined pressure, the plunger 27 and the valve shaft 18 do not move. In the state shown. In this state, the valve element 17 receives the spring force of the valve spring 20, and its flat portion 17 a contacts the opening edge of the valve hole 16, and closes the valve hole 16.

In this case, the communication between the introduction passage 5 and the discharge passage 6 is blocked, and the flow rate of the air guided to the discharge passage 6 is zero.

Next, when the hydraulic pressure acting on the plunger 27 becomes equal to or more than a predetermined pressure, the plunger 27 moves leftward in FIG. 1 and pushes the valve shaft 18 against the spring force of the valve spring 20. , The valve element 17 opens the valve hole 16.

Thus, the introduction passage 5 and the discharge passage 6
Communicate with each other through the valve hole 16, and the introduction passage 5
A predetermined flow rate of air is guided from the air to the discharge passage 6 through the valve hole 16. Specifically, from the introduction passage 5, the first valve chamber 1
3, a clearance formed between the flat portion 17a of the valve body 17 and the valve plate 15, a slit 17d formed in the cylindrical portion 17b of the valve body 17, a valve hole 16, and a discharge passage through the second valve chamber 14. It is led to 6. In this case, the flow rate of the air guided to the discharge passage 6 is controlled by the degree of opening of the valve hole 16 by the valve body 17, that is, the balance between the oil pressure acting on the plunger 27 and the spring force of the valve spring 20.

Here, the valve spring 20 is separated from the valve chamber 8 into which air is introduced by the bottom (partition) 11 of the partition member 4 and is sealed in the valve spring chamber 12 by a seal member 22. And a plunger 2
7 moves forward and backward with respect to the valve spring chamber 12 so that a valve shaft 18 extending through the bottom (partition) 11 of the partition member 4 can be operated. Therefore, the plunger 27 and the valve spring 18
Is advantageously prevented from being exposed to the air guided from the introduction passage 5 to the discharge passage 6.

Therefore, it is possible to prevent dust contained in the air from adhering to the plunger 27 and the valve spring 20 and to prevent rust from being generated by a chemical substance contained in the air as much as possible. An air flow control valve having excellent control characteristics and excellent durability can be obtained.

Although the embodiment has been described with reference to the drawings, the specific configuration is not limited to this embodiment and can be changed without departing from the spirit of the invention.
For example, although the embodiment in which the valve element 17 for opening and closing the valve hole 16 is attached to the valve shaft 18 has been described, the valve element and the valve shaft may be formed integrally.

[0033]

As described above in detail, according to the present invention, it is possible to prevent dust contained in the air from adhering to the plunger or the valve spring or to cause rust due to the chemical substance contained in the air. An air flow control valve which can be prevented as much as possible, has stable control characteristics, and has excellent durability can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an air flow control valve showing an embodiment of the present invention.

FIG. 2 is a perspective view of a valve body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air side valve main body 2 Hydraulic side valve main body 5 Inlet passage 6 Discharge passage 8 Valve chamber 11 Bottom (partition) 12 Valve spring chamber 16 Valve hole 17 Valve body 18 Valve shaft 22 Seal member 27 Plunger

Claims (2)

[Claims] An air-side valve body having a valve chamber having a valve hole communicating an air introduction passage and an air discharge passage with each other, and having a valve spring chamber separated from the valve chamber by a partition. A plunger provided on the hydraulic side valve main body connected to the air side valve main body and movable in the axial direction by hydraulic pressure, and penetrating a partition partitioning between the valve chamber and the valve spring chamber of the air side valve main body. A valve shaft extending in the axial direction and movable in the axial direction by the axial movement of the plunger; a valve attached to the valve shaft, which opens and closes a valve hole by the axial movement of the valve shaft; An air flow control valve, comprising: a valve spring disposed to bias the valve body in a valve closing direction of the valve hole via the valve shaft. 2. A seal member is provided between the partition wall and the valve shaft, which seals between a valve chamber and a valve spring chamber defined by the partition wall. 2. The air flow control valve according to 1.