WO2005036038A1

WO2005036038A1 - Solenoid valve

Info

Publication number: WO2005036038A1
Application number: PCT/JP2004/014854
Authority: WO
Inventors: Naoki Murata; Hiroyuki Nishinosono; Hideo Ogawa; Yoshinari Kasagi
Original assignee: Nok Corporation
Priority date: 2003-10-07
Filing date: 2004-10-07
Publication date: 2005-04-21
Also published as: JP4470538B2; JP2005133926A

Abstract

A solenoid valve, wherein a restriction passage (11b) is formed in a retainer (11) to provide flow resistance to a fluid flowing in and out between a plunger chamber (7) and a drain chamber (13) so as to generate damping force. Thus, the vibration of a valve element and a plunger can be attenuated to suppress the vibration thereof.

Description

Technical field

The present invention relates to a solenoid valve used for controlling various fluid pressures of an automobile or the like.

Background art

Conventionally, as this type of solenoid valve, for example, the one shown in FIG. 4 has been known.

Yes. Such a solenoid valve 100 has a solenoid section 300, a solenoid section 200, and a power

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[0003] The solenoid portion 300 includes a plunger chamber 304 formed therein by a cylindrically wound solenoid 301, a side ring 302 and a bearing 303 arranged concentrically on the inner peripheral side of the solenoid 301, and a plunger. A plunger 305 axially movably inserted into the chamber 304; a valve element 307 connected to the valve portion 200, which is one end of the plunger 305; The center post 306 is disposed concentrically with the bearing 303, the retainer 308 is inserted into the inner peripheral side of the center post 306, and the plunger 305 inserted between the plunger 305 and the retainer 308 faces the valve unit 200. And a drain port 310 for discharging the fluid in the plunger chamber 304 through a through hole provided in the center of the retainer 308.

[0004] Further, the valve section 200 opens on the side surface of the housing of the valve section 200, and has a fluid inflow port 204 communicating with a through hole penetrating in the axial direction, and a control port formed at one end of the through hole. A pressure port 201, a valve seat 203 disposed at the other end of the through-hole and in which the tip of a valve element 307 of the solenoid portion 300 abuts, and a valve seat 203 opposite to the control pressure port 201 with respect to the valve seat 203. And an outflow port 202 that opens on the side surface of the casing of the rev section 200.

[0005] By energizing the solenoid 301, such a solenoid valve 100 excites the center post 306, and attracts the plunger 305 toward the center post 306 against the panel force of the spring 309. The inflow port 204 and the outflow port 202 are communicated. That is, the valve element 307 is based on the pressure of the fluid inside the through hole and the panel force of the spring 309. It receives the pressing force of the plunger 305 against the valve element 307 and the exciting magnetic force of the center post 306 generated by energizing the solenoid 301. By controlling the balance of these three forces by changing the magnetic force of the solenoid 301, the plunger 305 is moved in the direction in which the valve body 307 opens to control the fluid.

[0006] Further, fluid that leaks to the outlet port 202 side toward the retainer 308 side of the plunger chamber 304 is discharged from the drain port 310 (for example, see Patent Document 1).

Patent Document 1: Japanese Patent Application Laid-Open No. 2001-227672

Disclosure of the invention

Problems to be solved by the invention

However, depending on how the solenoid valve 100 is controlled, for example, when the plunger 304 is suddenly operated to operate the valve body 307 in the valve opening or closing direction, the valve body 307 and the plunger The valve body 307 and the plunger 305 may cause self-excited vibration near the balance point of the three forces applied to the 305. Further, when the solenoid valve 100 is attached, vibration of the vehicle may be transmitted to the valve body 307 or the plunger 305 to cause self-excited vibration. Furthermore, the valve body 307 and the plunger 305 may vibrate due to pressure pulsation in the fluid passage connected to the inflow port 204, natural vibration of the exciting current of the solenoid 301, and the like.

As described above, when the valve body 307 and the plunger 305 vibrate, it is difficult to control the fluid by the solenoid valve 100 until the vibrations converge.

[0010] The present invention solves the above-mentioned problems of the prior art, and provides a flow resistance to a fluid flowing with movement of a plunger provided in a solenoid valve to generate a damping force. It is another object of the present invention to provide a solenoid valve capable of suppressing vibration of a plunger.

Means for solving the problem

[0011] In order to achieve the above object, a solenoid valve of the present invention comprises a fluid inflow port and an outflow port, a cylindrical solenoid, and a plunger chamber formed on the inner peripheral side of the solenoid. A plunger that moves in the plunger chamber in the axial direction by a magnetic flux generated by the solenoid; and a plunger disposed at one end of the plunger and communicates with the plunger. A plunger from the outflow port side to the other end of the plunger, the valve body being provided with a valve element that operates to open and close a flow path between the inflow port and the outflow port. A drain port for discharging a fluid leaking into the chamber, a drain chamber formed between the drain port and the plunger chamber, and a drain chamber provided between the drain chamber and the plunger chamber. A damping force generating member that generates a damping force for damping vibration of the plunger and the valve body by giving a flow resistance to a fluid flowing between the drain chamber and the plunger chamber. I do.

According to a preferred aspect of the present invention, the damping force generating member has a throttle passage.

The invention's effect

As described above, according to the solenoid valve of the present invention, it is possible to provide a solenoid valve capable of suppressing the vibration of the valve body and the plunger.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be illustratively described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention to them unless otherwise specified. Absent.

[0015] (First embodiment)

FIG. 1 is a sectional view showing a solenoid valve according to the first embodiment.

As shown in FIG. 1, the solenoid valve 1 includes a solenoid part 3 and a valve part 2.

[0017] The solenoid part 3 is a plunger formed therein by a solenoid 4 in which a copper wire is wound in a cylindrical shape, a side ring 5 and a bearing 6 arranged concentrically on the inner peripheral side of the solenoid 4. A plunger 8, which is a movable iron core inserted movably in the axial direction into the plunger chamber 7, a valve element 9 disposed on one side of the plunger 8 at the valve section 2, and a plunger 8. A center post 10 which is a fixed iron core arranged concentrically with the side ring 5 and the bearing 6 at the other end of the center post 10, and a retainer 11 which is a damping force generating member inserted into the inner peripheral side of the center post 10. And inserted between plunger 8 and retainer 11 A drain chamber formed in a space surrounded by the inner peripheral surface of the center post 10 with the surface opposite to the side on which the springs 12 of the retainer 11 are disposed and the spring 12 pressing against the boss portion 2 side. 13 and a drain port 14 for discharging the fluid in the drain chamber 13.

Further, the valve portion 2 includes a through hole 16 that penetrates in the axial direction and is formed on the inner peripheral surface side of a substantially cylindrical housing having a connection portion with a pipe for another fluid formed on the outer periphery. A fluid inflow port 15 communicating with the through hole 16, a fluid control pressure port 17 formed at one end of the through hole 16, and a solenoid disposed at the other end of the through hole 16. A valve seat 18 with which the tip of the valve element 9 of the part 3 abuts, a fluid outlet port 19 which is opposite to the control pressure port 17 with respect to the valve seat 18 and opens on the side surface of the housing of the valve part 2; It has.

Here, the solenoid valve 1 shown in FIG. 1 is a normally-closed type, and when energized to the solenoid 4 of the solenoid section 3, the valve element 9 of the valve section 3 opens. That's what I speak.

Accordingly, the solenoid valve 1 energizes the solenoid 4 to excite the center post 10, stake the plunger 8 by the panel force of the spring 12, and suck the plunger 8 toward the center post 10. As a result, the valve element 9 is separated from the valve seat 18 and is opened, and the inflow port 15 and the outflow port 19 communicate with each other. Then, the pressure inside the through hole 16 and the pressure in the control pressure port 17 continuously decreases according to the degree of opening of the valve. That is, when the solenoid 4 is not energized, the valve 9 is connected to the supply pressure of the fluid applied to the inflow port 15 (the fluid pressure in the through hole 16) and the spring 12 transmitted to the valve 9 via the plunger 8. The valve body 9 is seated on the valve seat 18 due to the balance between the panel force and the force of the panel, and the valve is closed. In this case, the pressure at the control pressure port 17 is maintained at a value close to the supply pressure. Also, when the solenoid 4 is energized, the plunger 8 is attracted to the center post 10 side against the panel force of the spring 12, so that the valve element 9 separates from the valve seat 8. That is, the sum of the fluid pressure inside the through hole 16 and the force with which the plunger 8 is sucked toward the center post 10 becomes larger than the panel force of the spring 12, and the valve body 9 separates from the valve seat 8. Therefore, a part of the fluid flowing from the inflow port 15 flows to the outflow port 19, so that the pressure at the control port 17 is reduced as compared to when the valve is closed. At this time, the exciting magnetic force and the degree of valve opening change depending on the energized current. It can be controlled in the range of pressure.

[0021] In the solenoid valve 1 of the present embodiment, the valve element 9 and the plunger 8 are arranged in the solenoid valve 1 in a state where they are not connected to each other. Note that the valve element 9 and the plunger 8 can be appropriately connected depending on the use conditions of the solenoid valve 1 and the like.

A communication groove 20 communicating with the valve body 9 side force retainer 11 side is formed in the outer periphery of the plunger 8 in the axial direction.

A bearing 21 that slidably guides the valve element 9 is inserted between the valve element 9 and the side ring 5.

[0024] The end of the retainer 11 on the plunger 8 side has a flange portion 11a that engages with the edge of the center post 10, and the surface of the flange portion 11a facing the plunger 8 is separated from the plunger 8. It is inserted into the center post 10 with a slight gap.

[0025] At the center of the retainer 11, a throttle passage lib that connects the plunger chamber 7 and the drain chamber 13 is provided.

Therefore, fluid leaking into the plunger chamber 7 through the gap between the valve body 9 and the bearing 21 from the outflow port 19 side passes through the communication groove 20 of the plunger 8 and the gap between the plunger 8 and the bearing 6. Into the plunger chamber 7 on the retainer 11 side. Then, the fluid that has flowed into the plunger chamber 7 flows into the drain chamber 13 through the throttle passage l ib provided in the retainer 11, and is discharged from the drain port 14.

[0027] For this reason, the fluid that leaks from the outlet port 19 to the retainer 11 side of the plunger chamber 7 is appropriately discharged from the drain port 14, so that when the plunger 8 operates at a relatively slow speed, the spring 12 The pressure in the plunger chamber 7 in which the plunger 8 is arranged does not increase, and the movement of the plunger 8 is not hindered.

Further, depending on how the solenoid valve 1 is controlled, for example, when the plunger 8 is suddenly operated in order to quickly open or close the valve body 9, the valve body 9 and the plunger 8 are automatically controlled. Excitation vibration may be caused. Further, vibration of the vehicle or the like may be transmitted to the solenoid valve 1, and the valve body 9 and the plunger 8 may cause self-excited vibration. In addition, the valve body 9 and the plunger 8 may vibrate due to pressure pulsation in the fluid passage connected to the inflow port 15 and natural vibration of the exciting current of the solenoid 4. When the vibration of the valve element 9 and the plunger 8 occurs, the plunger 8 operates at a higher speed than in the normal opening / closing operation control of the valve element 9.

In this case, the fluid flowing out and in between the plunger chamber 7 and the drain chamber 13 due to the movement of the plunger 8 in the plunger chamber 7 is transmitted to the throttle passage l ib provided in the retainer 11. Thus the flow rate is controlled. The throttle passage l ib applies a flow resistance to the fluid flowing therethrough to generate a damping force, whereby the vibration of the valve element and the plunger can be damped.

Further, since the drain chamber 13 is formed between the retainer 11 and the drain port 14, the fluid flowing out of the throttle passage l ib temporarily accumulates in the drain chamber 13.

[0032] Therefore, even when the plunger 8 moves in the direction in which the space of the plunger chamber 7 expands, that is, in the direction in which the valve element 9 is closed, the fluid force accumulated in the drain chamber 13 due to the throttle passage l ib Since the fluid flows into the plunger chamber 7 while receiving the flow resistance, even if the plunger 8 moves not only in the direction of opening the valve body 9 but also in the direction of closing the valve body, the flow resistance is given to the fluid flowing therethrough. By generating the damping force, the vibration of the valve body 9 and the plunger 8 can be damped.

The shape of the throttle passage l ib can be selected as appropriate. Force The area of the throttle passage l ib (the area of the surface perpendicular to the axis) Force The radial cross-sectional area of the plunger 8 (plunger 8) In this case, the area of the cross section perpendicular to the axis at the part where the hole for the spring 12 is not provided) is 2% —0.03%, specifically, the diameter of the throttle passage l ib is 1%. 5 mm-0.2 mm Force It is preferable to enhance the above damping effect. Thus, even if the plunger 8 moves abruptly by setting the throttle passage 1 lb, the flow of the fluid flowing out of the throttle passage l ib is appropriately controlled, and a high damping effect can be obtained. Become.

(Second Embodiment)

FIG. 2 is a cross-sectional view illustrating a solenoid valve according to the second embodiment.

The same components as those of the solenoid valve according to the first embodiment will be described.

Omitted.

[0036] The solenoid valve 1 according to the second embodiment has a center post 10 and a top surface 10a. A drain chamber 13 is formed in the inner space of the center post 10. Then, a drain port 14a is formed on the side surface of the center post 10.

[0037] For this reason, it is possible to ensure a reliable opening and closing operation of the valve body 9 in which the fluid is efficiently accumulated in the drain chamber 13 and there is no danger of dust or dust entering the fluid in the drain chamber 13 from outside. It is possible.

FIG. 3 shows a hydraulic control system for hydraulic control of an automatic transmission to which the solenoid valve 1 according to the above-described embodiment is applied. Note that the solenoid valve according to any of the embodiments is applicable.

As shown in FIG. 3, a pressure reducing valve 502 is connected to a line pressure hydraulic path 501 to which the line pressure L is supplied, and a solenoid supply pressure S controlled to a constant pressure by the pressure reducing valve 502 is supplied to the solenoid supply. The oil is supplied to the supply pressure oil passage 503 and guided to the inflow port 15 of the solenoid valve 1.

[0040] In addition to the inflow port 15, the solenoid valve 1 is provided with an outflow port 19 and a control pressure port 17 (a pilot pressure port). Then, the pilot pressure P controlled by the solenoid valve 1 is guided from the inflow port 15 to the pilot pressure oil passage 504 communicating with the spool valve 505.

The spool valve 505 is connected to a line pressure oil passage 501, a pilot pressure oil passage 504, and an output pressure oil passage 506. Then, the output pressure O guided to the output pressure oil passage 506 by the spool valve 505 is controlled by the line pressure L as the base pressure and the pilot pressure P as the operation signal pressure controlled by the solenoid valve 1.

[0042] The output pressure oil passage 506 is connected to a piston oil chamber such as a clutch (not shown), and controls the clutch and the like according to the magnitude of the output pressure.

[0043] Thereby, it is possible to control the pilot pressure P of the pilot pressure oil passage 504 within a range of 0-the solenoid supply pressure S.

When the solenoid valve 1 according to the present embodiment is applied to such a hydraulic control system for hydraulic control of an automatic transmission, even if the solenoid valve 1 is suddenly operated, the vibration of the valve body and the plunger will not occur. Therefore, the quick opening and closing operation of the solenoid valve 1 can be performed, and the responsiveness of the automatic transmission can be improved. Brief Description of Drawings

FIG. 1 is a cross-sectional view showing a solenoid valve according to a first embodiment.

FIG. 2 is a cross-sectional view showing a solenoid valve according to a second embodiment.

FIG. 3 is a diagram showing a hydraulic control system for hydraulic control of an automatic transmission.

FIG. 4 is a cross-sectional view showing a conventional solenoid valve.

Explanation of symbols

[0046] 1

4 Solenoid

7

8

9 Valve

11 Retainer (damping force generating member 9

l ib throttle passage

13 Drain room

14 Drain port

15 Inflow port

17 Control pressure port

19 Outflow port

Claims

The scope of the claims

[1] a fluid inlet port and a fluid outlet port;

A cylindrical solenoid,

A plunger chamber formed on the inner peripheral side of the solenoid;

A plunger that moves axially in the plunger chamber by a magnetic flux generated by the solenoid;

A valve body disposed on one end side of the plunger and opening and closing a flow path between the inflow port and the outflow port in conjunction with the plunger.

A drain port for discharging fluid leaking into the plunger chamber at the other end of the plunger;

A drain chamber formed between the drain port and the plunger chamber; and a drain chamber provided between the drain chamber and the plunger chamber to circulate between the drain chamber and the plunger chamber when the plunger moves. A solenoid valve, comprising: the plunger; and a damping force generating member that generates a damping force for damping vibration of the valve element by imparting flow resistance to a fluid.

2. The solenoid according to claim 1, wherein the damping force generating member has a throttle passage.