JPH06147348A - Solenoid valve - Google Patents

Abstract

PURPOSE:To simplify a structure and make a device small-sized and lightweight by sealing pressure chambers at the front and the rear of the axial direction, and communicating input/output ports between both seals when switching the passages communicating the pressure chambers communicated with the input/ output ports via the opening/closing actions of a valve mechanism. CONSTITUTION:A fitting member 10 is bored with a storage hole 11 and input ports 11a, 12a and output ports 11b, 12b communicated with the side face of the storage hole 11, and the housing 21 of a solenoid valve 20 is coupled with the storage hole 11. Pressure chambers 21a, 21b communicated with the ports 11a, 11b are formed in the housing 21, both pressure chambers 21a, 21b are communicated with each other by a communicating path 21c provided with a valve seat 23, and a valve ball 24f is fitted at the tip of the plunger 24c of a core assembly 24. Both sides of the pressure chambers 21a, 21b are sealed by seals 25a-25c having nearly the same pressure receiving area, the force in the pressure chamber 21a and the force in the pressure chamber 21b are invariably balanced, no force is generated toward the axial direction of a solenoid valve 20, and the strength of the housing 21 can be reduced that much.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve used for controlling fluid pressure by opening and closing various fluid passages of a vehicle.

[0002]

2. Description of the Related Art FIG. 7 shows a sectional view of a normally closed solenoid valve a which opens and closes a fluid path by excitation. Reference numeral b is a mounting member for mounting the solenoid valve a, and the mounting member b is provided with accommodation holes c having different diameters. A lower portion of a case e accommodating the exciting coil d is inserted into the accommodation hole c, and sealing materials f and g are sealed between the peripheral surfaces of the case e and the accommodation hole c. A plunger h that slides under excitation is housed in the case e, and a valve ball i is integrally formed at the tip of the plunger h. An opening that connects the first port j and the second port k is formed in the bottom of the case e. The valve seat 1 attached to this opening and the valve ball i form an on-off valve. This on-off valve is urged in the direction in which the ball i is seated on the valve seat 1 by the spring force of the spring n compressed between the plunger h and the yoke ring m, and the first port j and the second port k. When the plunger h is excited by the exciting coil d and urged in the contracting direction of the spring n, the valve ball i is separated from the valve seat 1 and the space between the ports j and k is cut off. To communicate. By the way, in this type of solenoid valve a, when a high pressure is generated in the second port k in a state where the valve mechanism is closed, this pressure acts in a direction in which the solenoid valve a comes out of the accommodation hole c. This detachment force is
It increases in proportion to the difference between the pressure receiving areas of the seal material f and the seal material g. In order to counter the axial force (axial force) due to this pressure, a high-strength pressing member o such as a steel plate is arranged outside the yoke ring m to press the solenoid valve a.

[0003]

The conventional solenoid valve described above has the following problems.

<B> In order to counter the axial force due to pressure,
It is necessary to design the electromagnetic valve a (case e of the exciting coil d) with high strength.

<B> As the maximum pressure generated in the solenoid valve a increases, the thickness of the pressing member o increases, and the weight and size of the apparatus are forced to increase.

<C> Even if the case e of the exciting coil d or the pressing member o is designed with high strength, it is difficult to completely restrain the deformation of these members due to the axial force. When the holding member o is expanded and deformed even a little, the liquid amount is consumed by the expanded amount. This phenomenon causes a problem that the stroke length of the brake pedal increases when the solenoid valve a is used as a braking element, for example.

<D> As a method of reducing the axial force described above, a method of designing the pressure receiving area of the seal portion to be small can be considered. However, there is a limit in relation to the internal parts of the solenoid valve a and strength.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its purpose is to provide a solenoid valve a.
An object of the present invention is to provide a solenoid valve capable of simplifying the fixing structure and reducing the size and weight of the device.

[0009]

SUMMARY OF THE INVENTION The present invention has a pressure chamber which is inserted into a housing hole of a mounting member and communicates with each input port and output port, and a flow path which communicates between the pressure chambers is provided. In an electromagnetic valve that has an excitation type valve mechanism in between and switches the flow path by opening and closing the valve mechanism, each pressure chamber seals with almost the same pressure receiving area before and after its axial direction, and each pressure chamber is sealed between each seal. It is a solenoid valve characterized by communicating each input / output port corresponding to.

[0010]

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings.

<B> Overall configuration FIG. 1 shows a mounting member 10 including a pair of normally closed and normally closed solenoid valves 2.
An example in which 0 and 30 are assembled will be shown. Since both valves 20 and 30 are different only in the biasing direction of the plunger and have the same other basic configuration, the normally closed solenoid valve 20 on the right side of the drawing will be described, and the normally open solenoid valve 30 will be described. Omit it.

<B> Mounting Member The mounting member 10 is provided with receiving holes 11 and 12 for inserting the solenoid valves 20 and 30, respectively, and further, the receiving holes 11 and 1 are provided.
The input port 11a12a and the input / output ports 11b and 12b communicating with the side surface of 2 are provided. In order to avoid the generation of the axial force described above, the inner diameters of the accommodation holes 11 and 12 are designed to be substantially the same, and the ports 11a and
It is essential that 12a, 11b and 12b communicate with the side surfaces of the receiving holes 11 and 12. In the figure, 11c and 12c are atmosphere communication holes formed at the bottoms of the accommodation holes 11 and 12, respectively.

<C> Solenoid Valve FIG. 2 shows an enlarged view of the electromagnetic valve 20. Reference numeral 21 in the drawing denotes a cylindrical housing integrally formed with the yoke 22, and a flange 27 is formed at the hem portion of the housing 21. The outer diameter of the housing 21 is formed to be substantially the same as the inner diameter of the accommodation hole 11, and the inside of the housing 21 has each input port 11
a and the pressure chambers 21a, 21 communicating with the input / output port 11b
b is formed, and the pressure chambers 21a and 21b are communicated with each other by a communication passage 21c. Communication path 2 on the pressure chamber 21a side
A valve seat 23 is arranged at the end of 1c. Housing 2
Seals 25a to 2 such as O-rings at a plurality of locations on the outer peripheral surface of
5c is mounted to ensure the sealing property between the pressure chambers 21a and 21b and the atmosphere. A core assembly 24 is fixed by caulking to the shaft center of the housing 21 so as to face the pressure chamber 21a. Further, the housing 21 is fixed to the mounting member 10 by caulking the mounting member 10. As other fixing means of the housing 21, a pin or a screw may be inserted and fixed across both members of the mounting member 10 and the housing 21, or a part of the inner peripheral surface of the accommodation hole 11 and the housing 21. Screws may be engraved and screwed on a part of the outer peripheral surface of each of them, or a known simple fixing means can be adopted. The core assembly 24 includes an armature 24b, a plunger 24c, a magnet core 24 and a sleeve 24a.
d and the spring 24e are housed. Plunger 2
A valve ball 24f is provided at the tip of 4c.
The valve seat 23 constitutes a valve mechanism that closes or communicates between the pressure chambers 21a and 21b. The spring 24e constantly urges the valve mechanism in a closing direction. Sleeve 2
An exciting coil 28, which is manufactured by winding a coil around a hollow bobbin, is provided around 4a, and the exciting coil 28 is caulked and fixed to the yoke 22 via a yoke ring 29 so as not to separate. In the figure, 26 is each pressure chamber 21.
It is a filter housed in a and 21b.

[0014]

Next, generation of axial force will be considered when high pressure is generated in each of the pressure chambers 21a and 21b with the valve mechanism of the solenoid valve 20 closed.

<B> Liquid Supply from Input Port In FIG. 3, both sides of each pressure chamber 21a, 21b are sealed with seals 25a-25c, and each seal 25a-25c.
The pressure receiving areas Sa to Sc in the parts are set to be substantially equal. Here, the pressure chamber 21a communicating with the input port 11a
When the internal pressure rises, the axial force Fa is generated toward both sides (vertical direction in the drawing) of the pressure chamber 21a. Each seal 25
The pressure receiving areas Sa and Sb of a and 25b are almost the same, the axial forces Fa and Fa generated on both sides of the pressure chamber 21a are substantially equal, and the directions of the forces are in opposite directions. Then, the axial force Fa dissipates. As a result, no matter how high the pressure is generated in the pressure chamber 21a, the axial force in one direction is not generated, so that the housing 21 does not come out of the accommodation hole 11 without pressing the upper end of the housing 21.

<B> Liquid Supply from Output Port As shown in FIG. 4, when the internal pressure of the pressure chamber 21b communicating with the output port 11b rises, this pressure is applied to the pressure chamber 21b.
An axial force Fb is generated toward both sides of b (vertical direction in the drawing). The pressure receiving areas Sb and Sc of the seals 25b and 25c are substantially the same, and the axial forces F generated on both sides of the pressure chamber 21a are the same.
Since b and Fb are almost equal and the directions of the forces are opposite to each other, they cancel each other and finally the axial force Fb is dissipated. As a result, no matter how high the pressure is generated in the pressure chamber 21b, almost no axial force in one direction is generated. Therefore, even if the upper end of the housing 21 is not pressed, the housing 2
1 does not come out of the accommodation hole 11.

<C> When differential pressure is generated Even when a pressure difference is generated between the liquid chambers 21a and 21b, the forces in the axial direction are canceled out by the pressure chambers 21a and 21b. Therefore, unlike the conventional case, the axial force from the high pressure side to the low pressure side is not generated, and the axial force in the opposite direction is not generated.

[0018]

[Embodiment 2] Since the present invention only needs to balance the pressure in units of pressure chambers, no axial force is generated even if the accommodation holes 11 have different diameters as shown in FIG. That is, each port 11a, 1
Seals 25d to 25g are attached to the front and rear of the pressure chambers 21a and 21b communicating with 1b in the axial direction.
21b is set so that the front and rear in the axial direction have substantially the same pressure receiving area.

[0019]

Third Embodiment As shown in FIG. 6, of the seals 25a to 25c mounted on the outer peripheral surface of the housing 21, the seal 25c closest to the bottom of the hole may be replaced with an O-ring, and a cup seal may be used. Good. In this embodiment, the housing 21
Since the air accumulated at the bottom of the housing hole 11 can be released to the outside of the hole by the seal 25c made of a cup seal when the housing is inserted into the housing hole 11 and assembled, the air communication hole 11c shown in FIG. Has the advantage that it can be omitted.

[0020]

Fourth Embodiment Although the two-position two-way solenoid valve 20 has been described above, it can be applied to a two-position three-way solenoid valve and a three-position three-way solenoid valve. The pressure medium is not limited to hydraulic pressure, and pneumatic pressure can be used.

[0021]

Since the present invention is as described above, the following effects can be obtained.

<a> By setting the pressure receiving areas on both sides of the pressure chamber to be substantially equal and connecting the ports to the side surfaces of the pressure chamber, even if the internal pressure of the pressure chamber rises, the force inside the pressure chamber is balanced and electromagnetic force is maintained. Little force is produced in the axial direction of the valve. Therefore, the strength of the housing forming the solenoid valve can be set low.

<B> In the past, a holding member was required to prevent the solenoid valve from coming off the mounting member, but the present invention does not require a holding member. Therefore, the solenoid valve can be significantly reduced in size and weight.

<C> It is possible to avoid the consumption of the pressure medium due to the expansion deformation of the solenoid valve.

<D> Since it can be applied to various applications such as a pressure on-off valve, a pressure regulating valve, an on-off valve, a pressure control valve, etc., it is highly versatile.

[Brief description of drawings]

FIG. 1 is an overall view of a solenoid valve according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a normally closed solenoid valve.

FIG. 3 is a conceptual diagram for explaining the action of a solenoid valve.

FIG. 4 is a conceptual diagram for explaining the action of a solenoid valve.

FIG. 5 is an explanatory diagram of a solenoid valve according to the second embodiment.

FIG. 6 is an explanatory diagram of a solenoid valve according to a third embodiment.

FIG. 7 is a sectional view of a solenoid valve on which the present invention is based.

Claims (1)

[Claims] 1. A pressure chamber that is inserted into a housing hole of a mounting member and communicates with each input port and output port, and an exciting valve mechanism is interposed on the way of a flow path that communicates between the pressure chambers. ,
In a solenoid valve that switches the flow path by opening and closing the valve mechanism, each pressure chamber is sealed with almost the same pressure receiving area in the axial direction, and each input / output port corresponding to each pressure chamber is connected between each seal. A solenoid valve, which is characterized by that.