JPH066857U - Solenoid valve - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce operating noise immediately after non-operation. [Structure] Stopper 24 provided in the valve body 5
And the stopper portion 12A provided on the second movable portion 2A come into contact with each other via the fluid to position the second movable portion 2A.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a solenoid valve used for controlling various oils, pneumatic equipment and the like.

[0002]

[Prior art]

 As a conventional solenoid valve of this type, there is one shown in FIG. 3, for example. That is, this solenoid valve reciprocates the movable member 100A including the first movable portion 109 that constitutes the plunger portion and the second movable portion 100B that is inserted into the valve body 102 by the electromagnetic attraction force of the solenoid 100. It is a three-way valve that switches the pressure by means of a valve body 102 that is integral with the solenoid 100 and is coaxially mounted. A spool 101 is slidably inserted into the inner circumference of the guide hole 103 in the valve body 102. Further, there are provided three ports including a first port 104 on the supply side to which pressure oil is supplied from a pressure source, a second port 105 on the output side to the actuator, and a discharge port 106.

On the other hand, the solenoid 100 is a cylindrical fixed member 107 made of a magnetic material, a coil 108 provided so as to surround the fixed member 107, and a magnetic material provided coaxially with the fixed member 107 and capable of reciprocating. The first movable portion 109 and the rod 110 fixed to one end of the first movable portion 109 and inserted into the valve body 102 via the inner circumference of the cylindrical fixing member 107. Since one end of the spool 101 is in contact with the tip of the rod 110 by the spring 111 provided on the other end of the spool 101 and biased toward the rod 110, the second movable portion 100B is It is composed of 101 and a rod 110. Further, the spool 101 is provided with a passage 112 that connects the solenoid 100 and the discharge port 106 of the valve body 102.

Then, the electromagnetic force of turning on and off the solenoid 100 causes the first movable portion 109 to come into contact with and separate from the fixed member 107. At this time, since the rod 110 fixed to the first movable portion 109 reciprocates, the spool 101 with which the rod 110 abuts reciprocates to open and close the second port 105 of the valve main body 102, and the first port The pressure from 10 4 is controlled and supplied to the actuator on the second port 105 side.

Further, when the solenoid 100 is turned on, the first movable portion 109 is attracted to the fixed member 107 and hits the stopper 113 made of a non-magnetic material provided on the end surface of the fixed member 107 on the side of the first movable portion 109, and via the rod 110. It controlled the position of the spool 101. When the solenoid 100 is repeatedly operated, the oil leaked from the sliding surface of the spool 101 on the solenoid 100 side or the oil supplied to the actuator when the spool is turned on and off is discharged from the discharge port 106 to the spool 101. The oil that has passed through the passage 112 was scattered to the stopper 113, and the operating noise from the stopper 113 was reduced by the mucous membrane of the oil.

[0006]

[Problems to be solved by the device]

 However, in the case of the above-described conventional technique, when the solenoid 100 is turned on and off, the first movable portion 109 is returned by the spring 111 provided at the other end of the spool 101 and hits the resin surface 114 inside the solenoid 100. Although the shock is alleviated and is not a problem, there is a problem that when the non-operating state continues, the oil film of the stopper 113 is reduced and the operating noise is large.

The present invention, in the case of the above-mentioned conventional technique, is to provide a solenoid valve capable of reducing operating noise immediately after a non-operating state.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, the electromagnetic attraction force of the solenoid attached to the valve body is used to reciprocate the movable member provided through the inside of the solenoid and the inside of the valve body. A solenoid valve comprising a first movable part forming a plunger part and a second movable part inserted in the valve body, wherein the movable member controls the pressure by opening and closing a port provided in the valve body. The stopper contact portion provided in the valve body and the stopper portion provided in the second movable portion come into contact with each other via a fluid to position the second movable portion.

[0009]

[Action]

 In the solenoid valve having the above structure, since the stopper contact portion is provided in the valve body, the fluid always adheres to the stopper contact portion. Therefore, even immediately after the non-operation state, the stopper contact portion to which the fluid is always attached hits the stopper portion provided in the second movable portion, so that the operation noise is reduced.

[0010]

【Example】

 The present invention will be described below based on the illustrated embodiment. Referring to FIG. 1 showing a solenoid valve according to an embodiment of the present invention, the solenoid valve 1 utilizes a solenoid attraction force of a solenoid 3 to form a plunger 8 as a first movable portion and a second plunger 8 as a movable portion. The movable member 1A including the movable portion 2A is driven to switch the pressure supply to the actuator (not shown).

The solenoid valve 1 includes a spool 2, a valve sleeve 5 as a valve body having a guide hole 4 into which the spool 2 is inserted, and a solenoid 3 for reciprocally driving the movable member 1A. Made of

The solenoid 3 is integrally assembled with the valve sleeve 5. Then, a cylindrical center post 6 serving as a magnetic material fixing member, one end of which faces the inside of the valve sleeve 5, a coil 7 arranged so as to surround the center post 6, and a center on the inner circumference of the coil 7. A plunger 8 made of a magnetic material which is coaxially inserted into the post 6 so as to be reciprocally movable, a resin 9 which covers the coil 7 and regulates the axial movement of the plunger 8, and the coil 7 is housed through the resin 9. A case 10 and a connector 11 for energizing the coil 7 are provided. A rod 12 is reciprocally inserted into the center post 6, one end of the rod 12 is fixed to the plunger 8, and the other end extends toward the spool 2 side.

On the other hand, the valve sleeve 5 is inserted and fixed in a mounting hole 14 of a mating mounting member 13 such as a cylinder head. Further, it has three ports of the first port 15, the second port 16 and the discharge port 17. Of these, the discharge port 17 is provided at the end opening of the valve sleeve 5 and communicates with the discharge side flow path 18 of the mating attachment member 13. The first port 15 and the second port 16 are provided at positions on the side wall of the valve sleeve 5 that are axially spaced apart from each other, and are provided in the supply side flow passage 13A and the output side flow passage 13B of the mating attachment member 13, respectively. It is designed to communicate.

An annular groove 19 is provided on the outer periphery of the spool 2, and the first port 15 on the supply side for supplying pressure from a pump (not shown) as a pressure source is always grooved. The second port 16 that opens toward the actuator 19 and that supplies or discharges the fluid on the output side to the actuator is opened and closed by the land portion 20 on the tip side of the concave groove 19 of the spool 2, and the second port 16 and the discharge port 17 to communicate the fluid of the actuator to the discharge port 17, or to communicate the second port 16 and the first port 15 through the concave groove 19 so that the pressure from the first port 15 becomes the second pressure. Pressure is supplied to the actuator via the port 16 or switching is performed.

Further, at a substantially radial center of the spool 2 on the solenoid 3 side, there is provided a projecting portion 21 projecting toward the solenoid 3 side and having a diameter smaller than that of the rod 12 abutting the central portion of the tip of the rod 12. Therefore, the outer peripheral portion 12A at the tip of the rod 12 is exposed when the projecting portion 21 comes into contact, and thus serves as a stopper portion for positioning the spool 2. A passage 22 that communicates with the interior of the solenoid 3 and the discharge port 17 is provided in the spool 2. The passage 22 is provided substantially in the center of the spool 2 in the radial direction, and communicates with the spool central hole 22A, which opens to the discharge port 17 side and extends to the protruding portion 21, and penetrates the protruding portion 21 in the radial direction. It is made up of a horizontal hole 22B and a horizontal hole 22B.

A stopper contact portion 24 is provided between the lateral hole 22B of the spool 2 and the sliding surface 23 of the spool 2 on the side of the solenoid 3 to which the outer peripheral portion 12A of the tip of the rod 12 abuts. The stopper contact portion 24 has a rectangular cross section and protrudes radially inward from the inner peripheral surface of the guide hole 4, and the inner diameter is larger than the outer diameter of the protruding portion 21 of the spool 2 and has a larger diameter. There is.

A spring 25 for urging the spool 2 toward the solenoid 3 is provided in the valve sleeve 5, and the spring force of the spring 25 causes the end face of the protruding portion 21 of the spool 2 to move the rod 12 to the rod 12. The second movable portion 2A is composed of the spool 2 and the rod 12 because it comes into contact with the tip. Therefore, when the solenoid 3 is off, the plunger 8 is separated from the center post 6 via the spool 2 and the rod 12 by the spring force of the spring 25, the second port 16 and the discharge port 17 are communicated with each other, and the actuator side is connected. The fluid is discharged.

On the other hand, when the solenoid 3 is turned on, the plunger 8 is magnetically attracted to the center post 6 against the spring force of the spring 25, and the land 2 is moved by moving the spool 2 via the rod 12. Then, the second port 16 and the discharge port 17 are closed, the first port 15 and the second port 16 are opened, and fluid pressure such as hydraulic pressure is supplied from the supply side flow passage 13A to the output side flow passage 13B.

When the solenoid 3 is turned on, the plunger 8 is magnetically attracted to the center post 6 so that the rod 12 fixed to the plunger 8 moves to the spool 2 side, and the outer peripheral portion 12A at the tip of the rod 12 hits the stopper. It hits the end face of the part 24. Therefore, the projecting portion 21 of the spool 2 that is in contact with the central portion of the tip of the rod 12 passes through the inner circumference of the stopper contact portion 24, and the outer peripheral portion 12A of the tip of the rod 12 serves as the stopper contact end surface of the portion 24. When it hits, it stops and the spool 2 is positioned.

In the solenoid valve having the above structure, the solenoid 3 is turned on between the opening of the lateral hole 22 B of the passage 22 communicating with the inside of the solenoid 3 and the discharge port 17 and the sliding surface 23 of the spool 2 on the solenoid 3 side. At this time, the outer peripheral portion 12A of the tip of the rod 12 hits, and the stopper abutting portion 24 that determines the position of the spool 2 is provided. Therefore, fluid such as oil leaking from the sliding surface 23 of the spool 2 on the solenoid 3 side is always stopped. It will be attached to (black-painted portion shown in FIG. 1). Therefore, even when the solenoid 3 is turned off → on immediately after the non-operating state, when the solenoid 3 is turned on, the outer peripheral portion 12A of the tip of the rod 12 always hits the stopper contact portion 24 to which the fluid adheres, so that the operating noise is reduced.

Further, when the solenoid 3 is turned on and off, the plunger 8 returns by the spring force of the spring 25 provided in the valve sleeve 5, but an impact is generated when the plunger 8 comes into contact with the end surface of the resin 9 that restricts the axial movement of the plunger 8. Will be alleviated. From the above, the change in operating noise due to the difference in usage condition also disappears.

FIG. 2 shows another embodiment of the present invention. In the above embodiment, the stopper portion is the outer peripheral portion 12A of the tip of the rod 12, and the stopper contact portion 24 has a rectangular cross section and projects radially inward from the guide hole 4, but in this embodiment, the stopper portion is formed. A flange 26 is formed at the tip of the rod 12 and extends radially outward, and a stopper contact portion is formed as a step 24A having a diameter larger than that of the guide hole 4 of the valve sleeve 5. Since other configurations and operations are the same as those in the first embodiment, the same components are designated by the same reference numerals and the description thereof will be omitted.

In each of the above-mentioned embodiments, the stopper portion is provided at the tip of the rod 12 as an example, but it may be provided at the spool 2 side. Also, the stopper contact portion is provided between the opening portion of the lateral hole 22B of the passage 22 provided in the spool 2 and the sliding surface 23 of the spool 2 on the solenoid 3 side. It may be provided on the sliding surface on the 17 side, or may be provided on the inside of the valve body.

Further, the positions where the stopper portions 12A and 26 and the stopper contact portions 24 and 24A of the rod 12 fixed to one end of the plunger 8 come into contact with each other via fluid, and the plunger 8 as the first movable portion is centered. Regarding the dimensional relationship with the position of magnetic attraction to the post 6, the plunger 8 may be magnetically attracted to the center post 6 in the vicinity of the stopper portions 12A and 26 contacting the stopper abutting portions 24 and 24A. In this case, the operating noise generated when magnetically adsorbing is reduced because the fluid is interposed between the stopper portions 12A and 26 and the stopper contact portions 24 and 24A.

[0025]

[Effect of device]

 The present invention has the above-described configuration and operation. Since the stopper contact portion is provided in the valve body, the fluid always adheres to the stopper contact portion. Therefore, even immediately after the non-operating state, the stopper contact portion to which the fluid is always attached hits the stopper portion provided in the second movable portion, so that the operating noise can be reduced.

[Brief description of drawings]

FIG. 1 (a) is an overall vertical cross-sectional view of a solenoid valve according to an embodiment of the present invention, and FIG. 1 (b) is an enlarged vertical cross-sectional view of a main part of FIG. 1 (a).

FIG. 2 is a longitudinal sectional view of a main part of a solenoid valve according to another embodiment.

FIG. 3 is an overall vertical sectional view of a conventional solenoid valve.

[Explanation of symbols]

 1 Solenoid Valve 1A Movable Member 2 Spool (Second Movable Part) 2A Second Movable Part 3 Solenoid 4 Guide Hole 5 Valve Sleeve (Valve Main Body) 6 Center Post 7 Coil 8 Plunger (First Movable Part) 9 Resin 10 Case 11 Connector 12 Rod (2nd movable part) 12A Outer peripheral part (stopper part) 13 Opposite side mounting member 13A Supply side flow path 13B Output side flow path 14 Mounting hole 15 1st port 16 2nd port 17 Discharge port 18 Discharge side flow path 19 Groove 20 Land 21 Projection 22 Passage 22A Spool central hole 22B Horizontal hole 23 Sliding surface 24 Stopper contact 24A Step (stopper contact) 25 Spring 26 Collar (stopper)

Claims (1)

[Scope of utility model registration request] 1. The electromagnetic attraction force of a solenoid attached to the valve body is used to reciprocate a movable member provided penetrating the inside of the solenoid and the inside of the valve body to open and close a port provided in the valve body to apply pressure. In the solenoid valve including a first movable portion that constitutes a plunger portion and a second movable portion that is inserted into the valve body, the movable member includes a stopper contact portion provided in the valve body. A solenoid valve, characterized in that a stopper portion provided on the second movable portion is brought into contact with each other via a fluid to position the second movable portion.