JP2002295708A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve that suppresses leakage in a simple structure and has high responsiveness and stability. SOLUTION: This solenoid valve has first and second puppet valves 21 and 23 for closing an inflow chamber 8 and a pressure control chamber 9, and the pressure control chamber 9 and an outflow chamber 10. A valve element member 17 is integrally formed of first and second valve elements 18 and 19, and a solenoid thrust force is transmitted to the valve element member 17 via a second pin 22.

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 a pressure of a fluid.

[0002]

2. Description of the Related Art Conventionally, there is a solenoid valve capable of performing pressure proportional control by adjusting input and output. FIG. 10 shows a conventional solenoid valve for controlling a control pressure. As shown in FIG. 10, the solenoid valve 101 has a valve section 102.
And a solenoid unit 103.

[0003] The valve section 102 is constituted by a so-called spool valve, and includes a cylindrical valve sleeve 104 and a spool 105 which is reciprocally inserted into the inner periphery of the valve sleeve 104.

An inflow port 106, a pressure control port 107, and an outflow port 108 are provided on the side wall of the valve sleeve 104 from below in the figure. Inflow port 106
Is for flowing a fluid having a supply pressure Ps pressurized from, for example, a hydraulic pump or the like into the valve unit 102, and the pressure control port 107 is for outputting a control pressure Pc from the valve unit 102. The outflow port 108 is for discharging the fluid having the control pressure Pc of the pressure control port 107 at the outflow pressure Pd.

[0005] The spool 105 is separated from the first land portion 105 in the axial direction by sliding on the inner periphery of the valve sleeve 104.
a and a second land portion 105b, and has a valve chamber 109 of an annular space between the first land portion 105a and the second land portion 105b.

[0006] The lower end of the spool 105 is urged toward the solenoid 103 by a spring 110. The urging force of the spring 110 is adjusted by a screw 111 provided at the lower end of the valve unit 102.

On the other hand, the solenoid 103 is provided with a valve 1
02, which is integrally assembled with the valve sleeve 104, a plunger 113 internally operatively connected to the spool 105 via a rod 112, a coil 114 surrounding the plunger 113, and a direction of movement of the plunger 113 by magnetic attraction (illustration And a center post 115 facing the plunger 113 (downward).

In the solenoid section 103, the coil 11
4 according to the magnitude of the current applied to the plunger 113.
The spool 105 is moved downward in the figure by moving the plunger 113 by magnetic attraction acting between the center post 115 and the center post 115.

For this reason, the solenoid valve 101 as a whole has a magnetic attraction force acting between the plunger 113 and the center post 115, and the first and second land portions 105a, 105.
The spool 105 is moved to a position where the force generated by the pressure using the diameter difference b and the urging force of the spring 110 are balanced. By the movement of the spool 105, the inflow port 106 closed by the first land portion 105a of the spool 105 is opened, and the supply pressure Ps of the inflow port 106 is transmitted to the pressure control port 107.

Hereinafter, the valve section 10 will be described with reference to FIG.
The state of the pressure control of No. 2 will be specifically described.

FIG. 11A shows a state in which magnetic attraction is not acting between the plunger 113 and the center post 115. The inflow port 106 is closed by the first land 105 a of the spool 105, and the pressure control port 107 is closed. Outflow port 108 allows fluid to pass through valve chamber 109.

FIG. 11B shows a magnetic attraction force acting between the plunger 113 and the center post 115, a force generated by pressure using the diameter difference between the first and second land portions 105a and 105b, and the attachment of the spring 110. And the power is balanced, and the inflow port 106 is connected to the first land 105a.
, The pressure control port 107 is located in the valve chamber 109, the outflow port 108 is closed by the second land 105 b, the ports 106, 107, and 108 are shut off, and the control pressure Pc of the pressure control port 107 is reduced. It is maintained and controlled to be constant.

FIG. 11C shows a magnetic attraction force acting between the plunger 113 and the center post 115 generated by pressure using the diameter difference between the first and second land portions 105a and 105b and the attachment of the spring 110. The spool 105 is pressed to the lower limit in the drawing, the outlet port 108 is closed by the second land 105b, and the inflow port 106 and the pressure control port 107 pass the fluid through the valve chamber 109. Let me.

As shown in FIG. 11, a solenoid valve 101 is driven by a solenoid unit 103 to rotate a spool 105.
Is moved to open and close the ports 106, 107, and 108 of the valve section 102, and the control pressure Pc of the pressure control port 107 is arbitrarily controlled.

[0015]

However, in the case of the above-described prior art, the following problems have occurred.

In the valve section 102 using the above-described spool valve, as shown in FIG. 11B, the inflow port 106 is connected to the first land section 105a in order to maintain the control pressure Pc of the pressure control port 107. Closed, second land part 10
The outlet port 108 is closed at 5b. At this time, the valve unit 1
Leaks occurring at 02 include a leak from the inflow port 106 to the pressure control port 107 and a leak from the pressure control port 107 to the outflow port 108. That is, the illustrated L
This is a leak that passes through the clearance seal length of v-Ls.

[0017] Even if such a leak occurs, in general, from the viewpoint of the responsiveness and stability of the valve section, the clearance seal length Lv-
Ls could not be lengthened.

For this reason, when the control pressure Pc is increased, there has been a problem that the leak at the clearance seal length Lv-Ls increases.

Each of the first and second land portions 105a, 105a
If the clearance at 05b is narrowed, the leak can be reduced, but it is difficult to process the spool 105, and the responsiveness and stability may be deteriorated. Therefore, it has been difficult to adopt this method.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a solenoid valve having a simple structure and excellent in responsiveness and stability for suppressing leakage. It is in.

[0021]

According to the present invention, there is provided a valve for connecting an inflow port, a pressure control port, and an outflow port, a solenoid for controlling the valve, Comprising a solenoid valve capable of controlling the pressure of the fluid flowing to the pressure control port,
A first pressure chamber connecting one of the inflow port or the outflow port, a pressure control chamber connecting the pressure control port, and a connection of the other of the inflow port or the outflow port and the solenoid A second pressure chamber in which a drive transmission unit is disposed, and a first valve body disposed in the first pressure chamber, the second pressure chamber being disposed in order toward the solenoid;
A first poppet valve including a first valve seat that communicates between the first pressure chamber and the pressure control chamber when the valve is opened; a second valve body disposed in the pressure control chamber; A second valve seat that communicates with the pressure control chamber and the second pressure chamber and is movable at a position to which a drive transmission unit of the solenoid is connected;
A second poppet valve comprising: a first poppet valve and a second poppet valve, wherein the first valve disc and the second valve disc are fixedly fastened by a fastening portion inserted through the first valve seat and provided as an integrated valve disc member. It is characterized by having.

Therefore, the first pressure chamber, the pressure control chamber, and the second pressure chamber to which the respective ports are respectively connected are the first and the second pressure chambers.
Since the valve is closed by the second poppet valve, the leak between the respective chambers can be suppressed by the good sealing property inherent to the poppet valve. Further, there is no need to perform processing such as narrowing the clearance between the clearance seal members, so that it is easy to manufacture and excellent in responsiveness and stability.

It is preferable that a first urging member for urging the first valve body toward the first valve seat so that the first poppet valve is normally closed is provided.

Accordingly, the first valve body is urged to the first valve seat by the first urging member, and the first poppet valve is normally closed.

It is preferable that a second urging member is provided for urging the second valve seat toward the solenoid, which is separated from the second valve body, so that the second poppet valve is normally opened.

Thus, the second urging member urges the second valve body toward the solenoid away from the second valve body, and the second poppet valve is normally opened.

The pressure control chamber has a hole that is slidably inserted into a through hole of a partition wall that separates the pressure control chamber from the second pressure chamber, and has a hole that communicates the pressure control chamber with the second pressure chamber. It is preferable to include a first tubular member connected to a drive transmission section of the solenoid, the control chamber side end being the second valve seat.

Thus, the first valve member is slidably moved in the through-hole, so that the second valve seat also moves, so that the position movement of the second valve seat can be realized with a simple structure. it can.

It is preferable that a partition for separating the pressure control chamber and the second pressure chamber is formed by a pressure receiving member, and the pressure receiving member has the second valve seat.

Thus, the position of the second valve seat is moved by the position movement of the pressure receiving member, so that the position movement of the second valve seat can be realized with a simple configuration.

It is preferable that the pressure receiving member also serves as the second biasing member and resiliently repels so that the second poppet valve is normally opened.

Thus, the number of parts can be reduced without the need for the second urging member.

The first pressure chamber is slidably inserted into a through hole extending from the first pressure chamber to the side opposite to the solenoid, has a hole therein, and has an end portion on the first pressure chamber side as a valve seat, and the first pressure chamber is provided with a first valve.
It is preferable to include a second cylindrical member that forms the valve body and the third poppet valve.

Thus, a state in which differential pressure control and flow rate control can be performed in the valve portion can be configured.

Preferably, the second cylindrical member is urged toward the first valve seat by the first urging member such that the first poppet valve is normally closed.

As a result, the third poppet valve is always kept closed.

[0037] It is preferable that the valve body member has a hole that allows communication between the hole of the first cylindrical member and the hole of the second cylindrical member.

Accordingly, the fluid pressure in the second pressure chamber is directed to the side opposite to the solenoid of the second cylindrical member via the hole in the first cylindrical member, the hole in the valve member, and the hole in the second cylindrical member. Thus, a state in which differential pressure control and flow rate control can be performed in the valve section can be configured.

It is preferable that a guide member is provided for guiding a fastening portion of the valve member for fastening the first and second valve bodies.

Thus, the displacement of the valve member can be prevented, and the sealing properties of the first and second poppet valves can be maintained well.

[0041]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the dimensions of the components described in this embodiment,
The material, the shape, and the relative arrangement thereof should be appropriately changed depending on the configuration of the apparatus to which the invention is applied and various conditions, and are not intended to limit the scope of the invention to the following embodiments.

(First Embodiment) A first embodiment will be described with reference to FIGS. FIG. 1 is a cross-sectional configuration diagram illustrating a cross-sectional configuration of a solenoid valve 1 that controls a control pressure that enables pressure proportional control according to the first embodiment. As shown in FIG. 1, the solenoid valve 1 includes a valve section 2 as a valve section and a solenoid section 3 having a solenoid.

The valve section 2 includes a valve seat 5, a guide 6 and a screw 7 inside a cylindrical valve sleeve 4.
Are loaded, three inflow chambers 8 as a first pressure chamber, a pressure control chamber 9, and an outflow chamber 10 as a second pressure chamber are sequentially formed toward the solenoid portion 3.

An inflow port 11, a pressure control port 12, and an outflow port 13 are connected to the inflow chamber 8, the pressure control chamber 9, and the outflow chamber 10 formed in the valve section 2, respectively. The inflow port 11 is for allowing a fluid having a supply pressure Ps pressurized from a hydraulic pump or the like to flow into the valve unit 2, and the pressure control port 12 is for outputting a control pressure Pc from the valve unit 2. The outflow port 13 is for discharging the fluid of the control pressure Pc in the pressure control chamber 9 at the outflow pressure Pd.

The inflow chamber 8 is separated from the pressure control chamber 9 by the valve seat 5 mounted inside the valve sleeve 4, and the lower surface of the valve seat 5 and the guide 6 mounted on the valve sleeve 4 following the valve seat 5. The upper concave portion is formed. The inflow chamber 8 is communicated with the pressure control chamber 9 via a hole in the valve seat 5.

The inflow chamber 8 is connected to a second outflow port 14 from below in addition to the inflow port 11 connected from the side wall of the valve sleeve 4. The guide 6 and the screw 7 provided at the lower end of the valve portion 2 loaded in the valve sleeve 4 subsequent to the guide 6 are formed with holes for communicating the inflow chamber 8 and the second outflow port 14.

The pressure control chamber 9 is connected to the pressure control port 12 from the side wall of the valve sleeve 4.
And a valve seat 5 provided with a large diameter substantially at the center in the axial direction of
It is formed by the upper surface and is interposed between the inflow chamber 8 and the outflow chamber 10 to communicate with each other.

The outflow chamber 10 is formed at the end of the valve sleeve 4 on the side of the solenoid portion 3, and has an open end closed by the connection of the solenoid portion 3.

A first pin 15 serving as a second cylindrical member is inserted through holes of the inflow chamber 8, the guide 6, and the screw 7. The first pin 15 is a cylindrical member having a flange portion 15a at an upper end portion, and has an inner hole communicating with the upper and lower ends. The inflow chamber 8 and the second outflow port 14 are communicated through the inner hole.

The outer diameter of the first pin 15 is substantially equal to the diameter of the hole of the guide 6, and the first pin 15 is slidable in the hole of the guide 6 and can be moved vertically.

First spring 16 as first urging member
Is the flange 1 at the upper end of the first pin 15 in the inflow chamber 8.
The first pin 15 is disposed between the recess 5a and the recess on the upper surface of the guide 6, and biases the first pin 15 in the direction of the solenoid portion 3. The first spring 16 is adjusted by a screw 7 provided at the lower end of the valve unit 2 to bias the first pin 15.

Above the first pin 15, a valve member 17 is disposed over the inflow chamber 8 and the pressure control chamber 9.
The valve body member 17 includes a spherical first valve body 18 and a first valve body 18.
And the first and second valve bodies 18 and 19
And the fastening portion 20 for fastening the two.

The first valve element 18 of the valve element member 17 is connected to the inflow chamber 8.
The first poppet valve 21 is configured such that the lower opening of the hole of the valve seat 5 on the spherical upper surface is the first valve seat 5a. The spherical lower surface of the first valve element 18 is
The third poppet valve 25 is constituted by using the upper surface of the flange portion 15a as the third valve seat 15b.

Here, as described above, the first pin 15 is urged in the direction of the solenoid portion 3 by the first spring 16 so that the first valve body 18 is moved to the first valve seat 5a of the valve seat 5.
To keep the first poppet valve 21 normally closed.

The third valve body 18 and the third pin 15
The third poppet valve 25 composed of the valve seat 15b is always closed by the first spring 16 pressing the first pin 15 against the first valve body 18 even when the valve body member 17 moves. State.

The fastening portion 20 of the valve body member 17 has a columnar shape, and the first valve body 18 and the second valve body 19 are fixedly fastened to form the first valve body 18.
By moving either the valve element 18 or the second valve element 19, the other is also moved. The fastening portion 20 is inserted into a hole of the valve seat 5 and slides between the inflow chamber 8 and the pressure control chamber 9 within a predetermined range. The fastening portion 20 is guided by a hole of the valve seat 5, and further, the first valve body 18.
The outer diameter portion of the second valve body 19 is guided by the inner peripheral walls of the chambers 8 and 9 so that the valve body member 17 can move smoothly.

The second valve body 19 of the valve body member 17 is disposed in the pressure control chamber 9 and uses the lower opening of the hole of the second pin 22 on the upper surface as the second valve seat 22b to operate the second poppet valve 23. Constitute.

On the second valve body 19, a second pin 22 as a first cylindrical member is provided which is inserted through the pressure control chamber 9 and the outflow chamber 10. The second pin 22 is a cylindrical member having a flange portion 22a at the upper end, and has an inner hole formed at the upper and lower ends.
And the outflow chamber 10 are communicated. And the second pin 2
A lateral hole 22c is formed on the side of the outflow chamber 10 for ensuring the communication between the inner hole and the outflow chamber 10.

The outer diameter of the second pin 22 is substantially equal to the hole diameter of the valve sleeve 4 connecting the pressure control chamber 9 and the outflow chamber 10, and the second pin 22 is slidable in the hole of the valve sleeve 4. It can be moved up and down. Fluid leakage from between the second pin 22 and the hole of the valve sleeve 4
This is prevented by increasing the distance between the pressure control chamber 9 and the outflow chamber 10 to increase the clearance seal amount.

A rod 27 as a drive transmitting portion of the solenoid portion 3 is connected to the flange portion 22a at the upper end of the second pin 22, and the second pin 22 is moved downward by the driving of the solenoid portion 3 (solenoid thrust). It is to be pushed.

Second spring 24 as second urging member
Is disposed between the flange portion 22a at the upper end of the second pin 22 in the outflow chamber 10 and the stepped portion of the valve sleeve 4 serving as the lower surface of the outflow chamber 10, and biases the second pin 22 toward the solenoid portion 3. are doing.

On the other hand, the solenoid portion 3 is integrally assembled with the valve sleeve 4 of the valve portion 2 and the case 26, and is provided above the valve portion 2.

The solenoid 3 has bearings 32, 33 inside.
Plunger 28 operatively connected to the second pin 22 via a rod 27 supported by the plunger, a coil 30 surrounding a plunger chamber 29 around the plunger 28, and a plunger 28 in the direction of movement (downward in the drawing) of the plunger 28 due to magnetic attraction. And a center post 31 opposed to the center post 31.

In the present embodiment, the lower end of the rod 27 operatively connected to the plunger 28 projects into the lower outflow chamber 10, and the flange portion 22a of the second pin 22 urged by the second spring 24 27 is in contact with the lower end.

In such a solenoid portion 3, the coil 3
The second pin 22 is moved downward by the rod 27 by moving the plunger 28 by the solenoid thrust by the magnetic attraction force acting between the plunger 28 and the center post 31 in accordance with the magnitude of the current applied to 0. .

For this reason, the solenoid valve 1 as a whole firstly receives the second spring 24 by the solenoid thrust by the magnetic attraction force acting between the plunger 28 and the center post 31.
The second pin 22 is moved against the urging force. The movement of the second pin 22 by the thrust of the solenoid further moves the valve body member 17 downward also against the urging force of the first spring 16, opens the first poppet valve 21, and supplies from the inflow chamber 8. The pressure Ps is transmitted to the pressure control chamber 9.

Hereinafter, the state of the pressure control of the valve section 2 will be specifically described with reference to FIG.

FIG. 2A shows a state in which no magnetic attraction is applied between the plunger 28 of the solenoid part 3 and the center post 31. The first poppet valve 21 between the inflow chamber 8 and the pressure control chamber 9 is shown in FIG. Are closed, the pressure control chamber 9 and the outflow chamber 1
The opening of the second poppet valve 23 between 0 and 0 allows fluid to pass from the pressure control chamber 9 to the outflow chamber 10 through the hole of the second pin 22.

FIG. 2B shows that the magnetic attraction force acts between the plunger 28 of the solenoid portion 3 and the center post 31, and the second force against the urging force of the second spring 24 by the thrust of the solenoid.
In a state where the pin 22 is moved downward and the second poppet valve 23 is closed, the first poppet valve 23 between the inflow chamber 8 and the pressure control chamber 9 is closed.
Since the poppet valve 21 is closed and the second poppet valve 23 between the pressure control chamber 9 and the outflow chamber 10 is also closed, each of the inflow chamber 8, the pressure control chamber 9, and the outflow chamber 10 is Is shut off and the control pressure P flowing out of the pressure control port 12 is released.
c is kept constant.

FIG. 2C shows that the magnetic attraction force acts more strongly between the plunger 28 and the center post 31 of the solenoid portion 3 to move the valve member 17 together with the second pin 22 downward by the thrust of the solenoid. In a state where the one poppet valve 21 is opened, the valve body member 17 is also moved downward through the second pin 22 against the first spring 16 so that the first poppet valve 21 moves between the inflow chamber 8 and the pressure control chamber 9. Since the one poppet valve 21 is open and the second poppet valve 23 between the pressure control chamber 9 and the outflow chamber 10 is closed, the valve seat 5 is moved from the inflow chamber 8 to the pressure control chamber 9. The fluid is passed through the holes.

As shown in FIG. 2, the valve section 2 is
By controlling the movement of the pin 22 and the valve member 17, the control pressure Pc flowing from the pressure control chamber 9 to the pressure control port 12 can be controlled.

FIG. 2 using the solenoid valve 1
The balance equation in the state where the control pressure Pc shown in FIG.

Where, F: solenoid thrust f1: urging force of first spring 16 f2: urging force of second spring 24 S1: pressure receiving area of first pin 15 S2: pressure receiving area of third valve seat 15b S3: first S4: Pressure receiving area of second valve seat 22b S5: Pressure receiving area of second pin 22 Pc: Control pressure Ps: Supply pressure Ps (S1-S2) -f1-Ps (S3-S2) + Pc (S3-S4) -Pc (S5-S4) -f2 + F = 0 (Equation 1).

By transforming (Formula 1), Ps (S1−S3) −Pc (S5−S3) −f1−f2 + F = 0 (Formula 2)

Here, the diameter of the first valve seat 5a and the first pin 1
5 is set to the same dimension, the pressure receiving area is the same, and in equation 2, if S1 = S3, then Pc (S1-S3) + f1 + f2 = F (Equation 3), which is controlled by the solenoid thrust F The pressure Pc can be controlled.

The operation of the valve section at this time is shown in FIG.
When the control pressure Pc is held at a constant value and the control pressure holding position is held constant, for example, when the control pressure Pc is increased,
The solenoid thrust F is increased, the second pin 22, the valve body member 17, and the first pin 15 are moved downward as shown in FIG. 2C, and the first poppet valve 21 is opened to reduce the supply pressure Ps. The control pressure Pc can be raised by flowing into the pressure control chamber 9.

For example, when decreasing the control pressure Pc, the solenoid thrust F is reduced, and the second pin 22 is moved upward by the urging of the second spring 24 as shown in FIG. By opening the second poppet valve 23, the control pressure Pc can flow out to the outflow chamber 10, and the control pressure Pc can be reduced.

Next, the diameter of the first pin 15 and the second pin 22
Are set to the same size, the pressure receiving area is the same, and in Expression 2, S1 = S5, S1-S3 = S5-S3 = S
Then, (Pc-Ps) S + f1 + f2 = F (Equation 4), and the supply pressure Ps and the control pressure P are determined by the solenoid thrust F.
The differential pressure control of c can also be performed (in this case, Pc> Ps).

In the equation (2), the first and second pins 1
5, 22 and the diameter of the first valve seat 5a are set to the same size, the pressure receiving areas are the same, S1 = S3 = S5, S1-S
Assuming that 3 = S5−S3 = S = 0, f1 + f2 = F (Equation 5), and the solenoid thrust F is set to the urging forces f1 and f2 of the first and second springs 16 and 24 regardless of the fluid pressure. And the stroke (opening) control for adjusting the opening amounts of the first and second poppet valves 21 and 23 by the solenoid thrust F, that is, the flow rate control can be performed (the fluid is supplied from the inflow port 11). ).

As described above, in the solenoid valve 1 of the present embodiment, the space between the inflow chamber 8, the pressure control chamber 9, and the outflow chamber 10 is closed by the first and second poppet valves 21, 23. The leak between the inflow chamber 8 and the pressure control chamber 9 and the leak between the pressure control chamber 9 and the outflow chamber 10 can be suppressed by a better sealing property than the spool valve originally used in the poppet valve. Further, there is no clearance seal member such as a spool valve which has been conventionally used, there is no need to perform a process of narrowing the clearance between the clearance seal members, and it is easy to manufacture and excellent in responsiveness and stability.

Further, as shown in FIG. 2B, the clearance seal length L1 of the first pin 15 and the clearance seal length L2 of the second pin 22 can be increased, and the clearance seal lengths L1, L2 To prevent leakage.

Next, another example of the solenoid valve according to the present embodiment will be described. 3 and 4 are schematic diagrams showing another example of the solenoid valve according to the present embodiment.

In the example shown in FIG. 3, FIGS.
As shown in (c), a fastening portion bearing 34 is provided as a guide member for guiding the fastening portion 20 of the valve member 17. Each of the bearings 34 is supported and fixed to the valve seat 5. Between the bearing 34 and the valve seat 5,
A passage 35 communicating the inflow chamber 8 and the pressure control chamber 9 is provided.

For this reason, the valve element member 17 is
Are stabilized only in the vertical direction (axial direction) to prevent the occurrence of positional displacement due to radial displacement. Therefore, the first and second valve bodies 18 and 19
The seating on the valve seats 5a and 22b is stabilized, and the first and second poppet valves 21 and 23 can be stably closed with good sealing properties when closed.

Here, FIG. 3D shows the valve seat 5 in which the passage 35 used for the solenoid valve 1 of FIG. 3B is formed. FIG. 3E shows a bearing 34 in which a passage 35 used in the solenoid valve 1 of FIG. 3C is formed.

In the example shown in FIG. 4, the second outflow port 14 is not provided, but the liquid reservoir 36 is formed in the screw 7 and the valve member 17 is formed with the through hole 17a penetrating in the axial direction. .

The through hole 17a of the valve member 17 is communicated with the hole of the first pin 15 at the lower opening, and the second pin 2 at the upper opening.
It is communicated with two holes.

Therefore, the outflow chamber 10 and the liquid reservoir 36 of the screw 7 are connected to the hole of the second pin 22 and the through hole 1 of the valve member 17.
7a, connected through the hole of the first pin 15,
By introducing the outflow pressure Pd to the upper side, the upper side of the first pin 15 becomes the supply pressure Ps of the inflow chamber 8, and the lower side of the first pin 15 becomes the outflow pressure Pd of the liquid reservoir 36. Can be realized. Therefore, the same control as in FIG. 1 can be performed in this configuration.

In this embodiment, the first and second poppet valves 21 and 21 having the first and second valve bodies 18 and 19 having spherical shapes are used.
23, but is not limited to such a shape. For example, the valve body may be formed into a conical shape capable of stroke control,
It is also possible to form a flat seal.

(Second Embodiment) A second embodiment will be described with reference to FIGS. The solenoid valve 1 'according to the second embodiment shown in FIG. 5A has a pressure receiving pressure provided with a movable second valve seat 38 having a second valve seat 38a at a lower end of a second poppet valve 23'. A member 37 is provided.

The other configuration and operation are the same as those of the first embodiment, so that the same components are denoted by the same reference characters and description thereof is omitted.

A pressure receiving member 37 is arranged as a partition separating the pressure control chamber 9 inside the valve sleeve 4 from the outflow chamber. The pressure receiving member 37 also plays the role of the second spring 24 in the first embodiment, and resiliently repels the solenoid 3. Therefore, the number of parts can be reduced.

The pressure receiving member 37 has a second valve seat 38 that moves according to the deformation of the pressure receiving member 37.

The second valve seat 38 is formed with a hole for communicating the pressure control chamber 9 with the outflow chamber 10. The opening at the lower end of the hole of the second valve seat 38 is used as a second valve seat 38a.
The second poppet valve 23 ′ is connected to the second valve element 19 of the valve element member 17.
Is configured.

The outflow chamber 10 of the second valve seat 38
On the side, there is formed a lateral hole 38b for securely communicating the hole of the second valve seat 38 with the outflow chamber 10. Then, the rod 2 of the solenoid portion 3 is attached to the upper end of the second valve seat 38.
7 is connected.

In the above configuration, as shown in FIG. 6, the state of the pressure control of the valve section 2 can be controlled.

FIG. 6A shows a state in which no magnetic attraction is applied between the plunger 28 of the solenoid part 3 and the center post 31. The first poppet valve 21 between the inflow chamber 8 and the pressure control chamber 9 is shown in FIG. Are closed, the pressure control chamber 9 and the outflow chamber 1
Since the second poppet valve 23 ′ is open between 0 and 0, the fluid is passed from the pressure control chamber 9 to the outflow chamber 10 through the second valve seat 38.

FIG. 6B shows that the magnetic attraction force acts between the plunger 28 of the solenoid portion 3 and the center post 31, and the second valve seat 38 moves downward against the urging force of the pressure receiving member 37 by the thrust of the solenoid. In this state, the second poppet valve 23 'is closed, the first poppet valve 21 between the inflow chamber 8 and the pressure control chamber 9 is closed, and the pressure control chamber 9 and the outflow chamber 10 are closed. Since the second poppet valve 23 'is also closed, each of the inflow chamber 8, the pressure control chamber 9, and the outflow chamber 10 is shut off, and the control pressure Pc flowing out from the pressure control port 12 is maintained constant. ing.

FIG. 6 (c) shows that the magnetic attraction force acts more strongly between the plunger 28 and the center post 31 of the solenoid part 3, and the solenoid thrust moves the valve member 17 together with the second valve seat 38 downward. First poppet valve 21
Is opened, and the valve body member 17 is also moved downward against the first spring 16 via the second valve seat 38 so that the first poppet valve between the inflow chamber 8 and the pressure control chamber 9 is opened. 21 is open and the second poppet valve 23 between the pressure control chamber 9 and the outflow chamber 10 is closed, so that the fluid flows from the inflow chamber 8 to the pressure control chamber 9 through the hole of the valve seat 5. Is passing through.

As shown in FIG. 6, the valve section 2
By controlling the movement of the valve seat 38 and the valve body member 17, the control pressure Pc flowing from the pressure control chamber 9 to the pressure control port 12 can be controlled.

FIG. 6 shows the operation of the solenoid valve 1 '.
With respect to the balance formula in the state where the control pressure Pc is held as shown in FIG.
(Equation 5) is established from (Equation 1) shown in the embodiment, and pressure control, differential pressure control, and pressure control are performed in the same manner as in the first embodiment.
Flow control can be performed.

As shown in FIG. 6B, the pressure control chamber 9 and the outflow chamber 10 are separated by the pressure receiving member 37, so that the clearance of the second pin 22 as in the first embodiment is provided. Since the seal length L2 is not required, a leak between the pressure control chamber 9 and the outflow chamber 10 is prevented, and the axial length can be reduced by the clearance seal length L2.

FIG. 5B shows another example of the solenoid valve 1 'according to this embodiment.

In the example shown in FIG. 5 (b), a flange 38c is formed at the lower end of the second valve seat 38, and the pressure receiving member 37 is a bellows with bellows formed in the axial direction. . The pressure receiving member 37, which is a bellows, is attached by mounting a sleeve 39 connected to the base to the valve sleeve 4.

Further, instead of the pressure receiving member 37 also serving as the second spring 24 of the first embodiment, the pressure receiving member 37
Alternatively, a second spring 24 may be provided.

(Third Embodiment) A third embodiment will be described with reference to FIGS. The solenoid valve 1 ″ according to the third embodiment shown in FIG.
The outflow port is eliminated, and the first spring 1
6, the first valve element 18 is biased via the first valve element holding member 40.

Other configurations and operations are the first.
Since the second embodiment is the same as the second embodiment, the same components are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 7, the valve member 1 is provided in the inflow chamber 8.
7, the first valve body 18, the first spring 16 and the first valve body 1
8 and the urging force of the first spring 16 is applied to the first valve body 1.
8 has a first valve body holding member 40.

Hereinafter, the state of the pressure control of the valve section will be specifically described with reference to FIG. Here, FIG.
The solenoid valve 1 ″ having the above configuration is taken as an example.

FIG. 8A shows a state in which no magnetic attraction is applied between the plunger 28 of the solenoid portion 3 and the center post 31. The first poppet valve 21 between the inflow chamber 8 and the pressure control chamber 9 is shown in FIG. Are closed, the pressure control chamber 9 and the outflow chamber 1
The opening of the second poppet valve 23 between 0 and 0 allows fluid to pass from the pressure control chamber 9 to the outflow chamber 10 through the hole of the second pin 22.

FIG. 8B shows that the magnetic attraction force acts between the plunger 28 of the solenoid portion 3 and the center post 31, and the second force against the biasing force of the second spring 24 is generated by the thrust of the solenoid.
In a state where the pin 22 is moved downward and the second poppet valve 23 is closed, the first poppet valve 23 between the inflow chamber 8 and the pressure control chamber 9 is closed.
Since the poppet valve 21 is closed and the second poppet valve 23 between the pressure control chamber 9 and the outflow chamber 10 is also closed, each of the inflow chamber 8, the pressure control chamber 9, and the outflow chamber 10 is Is shut off and the control pressure P flowing out of the pressure control port 12 is released.
c is kept constant.

FIG. 8 (c) shows that the magnetic attraction force is further increased between the plunger 28 and the center post 31 of the solenoid portion 3, and the second pin 22 and the valve member 17 are moved downward by the solenoid thrust. In a state where the one poppet valve 21 is opened, the valve body member 17 is also moved downward through the second pin 22 against the first spring 16 so that the first poppet valve 21 moves between the inflow chamber 8 and the pressure control chamber 9. Since the one poppet valve 21 is open and the second poppet valve 23 between the pressure control chamber 9 and the outflow chamber 10 is closed, the valve seat 5 is moved from the inflow chamber 8 to the pressure control chamber 9. The fluid is passed through the holes.

As shown in FIG. 8, the valve section 2
By controlling the movement of the pin 22 and the valve member 17, the control pressure Pc flowing from the pressure control chamber 9 to the pressure control port 12 can be controlled.

FIG. 8 shows the operation of the solenoid valve 1 ″.
The balance equation in the state where the control pressure Pc shown in FIG.

Where, F: solenoid thrust f1: urging force of first spring 16 f2: urging force of second spring 24 S3: pressure receiving area of first valve seat 5a S4: pressure receiving area of second valve seat 22b S5: second The pressure receiving area of the second pin 22 Pc: control pressure Ps: supply pressure: -f1-PsS3 + Pc (S3-S4) -Pc (S5-S4) -f2 + F = 0 (Equation 1 ').

When this (Formula 1 ') is modified, -PsS3-Pc (S5-S3) -f1-f2 + F = 0 (Formula 2')

Here, if the supply pressure Ps is within a range where the supply pressure Ps is constant or fluctuates so as not to affect, PsS3 = A in (Equation 2 ′), Pc (S5−S3) + f1 + f2 + A = F 3 ′), and the control pressure Pc can be controlled by the solenoid thrust F.

The operation of the valve section at this time is shown in FIG.
When the control pressure Pc is held at a constant value and the control pressure holding position is held constant, for example, when the control pressure Pc is increased,
The solenoid thrust F is increased, and the second pin 22 and the valve member 17 are moved downward as shown in FIG.
By opening the poppet valve 21, the supply pressure Ps flows into the pressure control chamber 9, and the control pressure Pc can be increased.

For example, when lowering the control pressure Pc, the solenoid thrust F is reduced, and the second pin 22 is moved upward by the urging of the second spring 24 as shown in FIG. By opening the second poppet valve 23, the control pressure Pc can flow out to the outflow chamber 10, and the control pressure Pc can be reduced.

This control is performed by controlling the solenoid valve 1 ″ (the pressure receiving member 37 and the second
Also in the configuration including the valve seat 38), the equation (3 ′) is established from (Equation 1 ′) using f2 as the elastic repulsive force of the pressure receiving member 37, and the same can be performed.

As described above, the pressure control can be performed also in the solenoid valve 1 ″ of the present embodiment in the same manner as in the first embodiment.

FIG. 9 shows another example of the solenoid valve 1 ″ according to the present embodiment. FIGS. 9 (a) and 9 (b) are modified configurations of FIGS. 8 (a) and 8 (b). It is.

In the example shown in FIG. 9, the first valve body holding member 40
And the first valve body 18 is formed in a shape in which the first valve body holding member 40 is integrated. In this manner, the first spring 16 may directly press the first valve body 18.

In the above-described embodiment, when no magnetic attraction force acts between the plunger 28 of the solenoid portion 3 and the center post 31, the valve member 17 and the second pin 2
2 move upward, the first poppet valve 21 is closed by the first valve element 18, the second pin 22 is separated from the second valve element 19, the second poppet valve 23 is opened, and the supply pressure Ps Of the so-called normally closed type in which the control pressure Pc is cut off, the arrangement of the inflow port 11 and the outflow port 13 connected to the inflow chamber 8 and the outflow chamber 10 is exchanged to form a so-called normally open type (supply pressure). Ps is the control pressure P
c) is also possible.

[0125]

As described above, according to the present invention,
Since the first pressure chamber, the pressure control chamber, and the second pressure chamber to which the respective ports are respectively connected are closed by the first and second poppet valves, the respective chambers are formed by the good sealing property of the poppet valve. It is possible to suppress the leak between them. Also,
There is no need for processing such as narrowing the clearance between the clearance seal members, making it easy to manufacture and excellent in responsiveness and stability.

By providing a first biasing member for biasing the first valve body toward the first valve seat such that the first poppet valve is normally closed, the first biasing member allows the first valve body to be closed. By biasing the first valve seat, the first poppet valve is normally closed.

The second valve seat is provided with a second biasing member for biasing the second poppet valve toward the solenoid away from the second valve body so that the second poppet valve is normally opened. 2
The valve body is urged toward the solenoid side away from the second valve body, and the second poppet valve is normally opened.

The pressure control chamber and the second pressure chamber are slidably inserted into through holes of the partition wall, and have holes through which the pressure control chamber and the second pressure chamber are communicated. Is provided as a second valve seat, and the first tubular member connected to the drive transmission portion of the solenoid is provided, so that the first tubular member is slidably moved in the through hole, so that the second valve seat is also provided. Since the position is moved, the position of the second valve seat can be moved with a simple configuration.

A partition for separating the pressure control chamber and the second pressure chamber is formed by a pressure receiving member, and the pressure receiving member has a second valve seat, so that the position of the pressure receiving member moves so that the second valve seat also moves. Therefore, the movement of the position of the second valve seat can be realized with a simple configuration.

The pressure receiving member also serves as the second urging member and resiliently repels so that the second poppet valve is always open, so that the number of parts can be reduced without the need for the second urging member.

The first pressure chamber is slidably inserted into a through hole extending from the first pressure chamber to the side opposite to the solenoid, has a hole therein, and has a first pressure chamber side end as a valve seat and a first valve body and a second valve body. Providing the second cylindrical member that constitutes the three-poppet valve makes it possible to configure a state where differential pressure control and flow rate control are possible in the valve section.

The second cylindrical member is urged toward the first valve seat by the first urging member so that the first poppet valve is normally closed, so that the third poppet valve is always closed. It is maintained in the state.

The valve body member has a hole for communicating between the hole of the first cylindrical member and the hole of the second cylindrical member, so that the hole of the first cylindrical member, the hole of the valve body member, and the second cylindrical member are provided. The fluid pressure in the second pressure chamber is guided to the opposite side of the second cylindrical member from the solenoid through the hole of the cylindrical member, and a state where differential pressure control and flow rate control can be performed in the valve portion can be configured.

By providing a guide member for guiding a fastening portion for fixing and fastening the first and second valve bodies of the valve body member, displacement of the valve body member can be prevented, and the sealing properties of the first and second poppet valves can be prevented. Can be favorably maintained.

[Brief description of the drawings]

FIG. 1 is a sectional configuration diagram showing a solenoid valve according to a first embodiment.

FIG. 2 is an explanatory diagram showing a control state of a valve section of the solenoid valve according to the first embodiment.

FIG. 3 is a view showing another example of the solenoid valve according to the first embodiment.

FIG. 4 is a diagram showing another example of the solenoid valve according to the first embodiment.

FIG. 5 is a sectional configuration diagram showing a solenoid valve according to a second embodiment.

FIG. 6 is an explanatory diagram showing a control state of a valve section of a solenoid valve according to a second embodiment.

FIG. 7 is a cross-sectional configuration diagram illustrating a solenoid valve according to a third embodiment.

FIG. 8 is an explanatory diagram showing a control state of a valve section of a solenoid valve according to a third embodiment.

FIG. 9 is a diagram showing another example of the solenoid valve according to the third embodiment.

FIG. 10 is a sectional view showing a conventional solenoid valve.

FIG. 11 is an explanatory diagram showing a control state of a valve section of a conventional solenoid valve.

[Explanation of symbols]

 1, 1 ', 1 "solenoid valve 2 valve section 3 solenoid section 4 valve sleeve 5 valve seat 5a first valve seat 6 guide 7 screw 8 inflow chamber 9 pressure control chamber 10 outflow chamber 11 inflow port 12 pressure control port 13 outflow port 14 second outflow port 15 first pin 15b second valve seat 16 first spring 17 valve body member 17a through hole 18 first valve body 19 second valve body 20 fastening portion 21 first poppet valve 22 second pin 22b second Valve seat 23 Second poppet valve 24 Second spring 25 Third poppet valve 27 Rod 28 Plunger 31 Center post 34 Bearing for fastening part 35 Passage 36 Liquid pool 37 Pressure receiving member 38 Second valve seat 38a Second valve seat 39 Sleeve 40 Valve Body holding member

Continuation of front page (72) Inventor Hideki Todoen 4-3-1 Tsujido Shinmachi, Fujisawa-shi, Kanagawa NOK Co., Ltd. (72) Inventor Shuji Fukunaga 4-3-1 Tsujido Shinmachi, Fujisawa-shi, Kanagawa N OK Corporation F term (reference) 3H106 DA03 DA23 DA31 DB02 DB12 DB23 DB32 DC04 DD09 DD10 EE04 EE34 GB08 KK03

Claims (10)

[Claims] A solenoid for controlling a pressure of a fluid flowing through the pressure control port, comprising: a valve for connecting the inflow port, the pressure control port, and the outflow port; and a solenoid for controlling the valve. A valve, comprising: a first pressure chamber connecting one of the inflow port and the outflow port; a pressure control chamber connecting the pressure control port; and connecting the other one of the inflow port or the outflow port. And a second pressure chamber in which a drive transmission portion of the solenoid is disposed, in order toward the solenoid, a first valve element disposed in the first pressure chamber, and the first pressure member when the valve is opened. A first valve seat for communicating between the pressure chamber and the pressure control chamber;
A first poppet valve, a second valve body disposed in the pressure control chamber, and a communication between the pressure control chamber and the second pressure chamber when the valve is opened, and a drive transmission unit of the solenoid connected thereto. Moveable second position
A second poppet valve comprising a valve seat, wherein the first valve body and the second valve body are fixedly fastened to each other by a fastening portion inserted through the first valve seat and integrated. A solenoid valve provided on a body member. 2. The apparatus according to claim 1, further comprising a first urging member for urging the first valve body toward the first valve seat so that the first poppet valve is normally closed. The described solenoid valve. 3. The apparatus according to claim 2, further comprising a second urging member for urging the second valve seat toward the solenoid away from the second valve body so that the second poppet valve is normally open. The solenoid valve according to claim 1 or 2, wherein 4. A pressure sensor having a hole slidably inserted in a through hole of a partition wall separating the pressure control chamber and the second pressure chamber, the hole communicating the pressure control chamber with the second pressure chamber, 4. The solenoid valve according to claim 1, further comprising: a first tubular member connected to a drive transmission unit of the solenoid, the pressure control chamber-side end serving as the second valve seat. 5. . 5. The pressure receiving chamber according to claim 1, wherein the pressure control chamber is separated from the second pressure chamber by a pressure receiving member, and the pressure receiving member has the second valve seat. The described solenoid valve. 6. The solenoid valve according to claim 5, wherein said pressure receiving member also serves as said second urging member and resiliently repels so that said second poppet valve is normally opened. 7. A first pressure chamber is slidably inserted into a through hole extending from the first pressure chamber to a side opposite to the solenoid, has a hole therein, and has a first pressure chamber side end as a valve seat. First
The solenoid valve according to any one of claims 1 to 6, further comprising a second cylindrical member that forms a valve body and a third poppet valve. 8. The second cylindrical member is urged toward the first valve seat by the first urging member such that the first poppet valve is normally closed. Item 7
2. The solenoid valve according to item 1. 9. The solenoid valve according to claim 8, wherein the valve body member has a hole communicating between the hole of the first cylindrical member and the hole of the second cylindrical member. 10. The solenoid according to claim 1, further comprising a guide member for guiding a fastening portion of the valve member for fastening the first and second valve members. valve.