JPH0886375A - Solenoid - Google Patents

Abstract

PURPOSE: To improve the responsiveness of a movable member and reduce the pulsation of a mating mounting valve to be controlled by providing a fluid control member to control the flow of fluid from a flow path opposedly to an opening part of the flow path which is provided in the movable member. CONSTITUTION: A current is applied to a solenoid main body 2 so as to attract a plunger 3 magnetically to a center post 4. Also a fluid control member 13 is mounted on the plunger 3, and a fluid control part 13B is arranged opposedly to an opening part of a flow path 12. In the reciprocating movement of the plunger 3, a flow of the fluid flowing through a clearance between the plunger 3 and an upper plate 10 from the flow path 12 is obstructed, thus producing a resistance during the movement of the plunger 3. By this, the responsiveness of the plunger 3 in A and B directions when the solenoid is turned on and off can be delayed. Then the fine vibration of the plunger 3 generated when a dither current is applied to a control current can be suppressed so as to reduce the pulsation of a mating valve.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid used for, for example, a solenoid valve.

[0002]

2. Description of the Related Art A conventional solenoid of this type is shown in FIG. That is, 100
Shows a solenoid, and a movable member 102 made of a magnetic material is reciprocally inserted into the hollow inside of a solenoid main body 101 having an inner hollow, and the movable member 102 is coaxially fixed so as to face the movable member 102. A member 103 is provided.

The movable member 102 is magnetically attracted to the fixed member 103 by applying a current to the solenoid body 101. At this time, when a control current on which the dither current is superimposed is applied, the movable member 102 follows it and a slight vibration occurs. As a result, minute vibrations are transmitted to the other party's fluid pressure valve (not shown) controlled by the solenoid 100, resulting in pulsation.

This pulsation is reduced and the solenoid 100
In order to delay the responsiveness of the movable member 102, the sliding resistance between the movable member 102 and the solenoid main body 101 should be increased, or the fluid flow on both end surfaces provided on the outer peripheral portion of the movable member 102 as shown in FIG. An orifice portion 104A is provided on the back surface side of the movable member 102 of the allowable flow path 104, or the fixed member 10 is provided.
The responsiveness was delayed by providing an orifice (not shown) in the flow path 105 penetrating the fixing member 103 provided in No. 3.

[0005]

However, when the sliding resistance is increased, the number of hysteris increases and the flow paths 104, 1
If the orifice portion is provided at 05 and the flow passages 104 and 105 are narrowed, the viscosity of the fluid becomes high at low temperature, the movable member 102 does not move, and the responsiveness deteriorates.

The present invention has been made to solve the above-mentioned problems of the prior art. The object of the present invention is to improve the response of the movable member (to delay the response) and to control the other party. An object of the present invention is to provide a solenoid that can reduce the pulsation of a mounting valve.

[0007]

In order to achieve the above object, according to the present invention, a movable member made of a magnetic material is reciprocally inserted into a hollow inside of a solenoid main body having an internal hollow, and the movable member. A fixed member made of a magnetic material and provided coaxially to face the member. The movable member is magnetically attracted to the fixed member by applying an electric current to the solenoid body, and both end surfaces of the movable member. In a solenoid having a flow passage that allows a fluid flow on the side, a fluid regulating member that regulates the flow of the fluid that has flowed through the flow passage is opposed to the opening of the flow passage when the movable member moves. It is characterized by being provided.

[0008]

In the solenoid having the above structure, since the fluid regulating member for regulating the flow of the fluid from the flow passage is provided so as to face the opening of the flow passage provided in the movable member, The flow of the fluid flowing from the flow path during the movement of the movable member is obstructed, which becomes a resistance during the movement of the movable member. This makes it possible to delay the responsiveness of the movable member and suppress fine vibration due to the dither current.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In FIG. 1, which shows a solenoid according to an embodiment of the present invention, reference numeral 1 denotes a solenoid used for, for example, a hydraulic valve or the like.
A plunger 3 as a movable member made of a magnetic material that is reciprocally inserted into the hollow of the solenoid body 2, and a center post 4 as a fixed member made of a magnetic material that is coaxially provided so as to face the plunger 3. The plunger 3 is magnetically attracted to the center post 4 by applying a current to the solenoid body 2.

The solenoid body 2 has a case 5 having both ends open, a coil 6 housed in the case 5, and one opening end of the case 5 is closed so that a magnetic path from the case 5 is centered on the center post 4. It is composed of an annular lower plate 7 that guides to.

A cylinder 8 for guiding a magnetic path from an upper plate 10 described later is inserted in the plunger 3 at the inner circumference of one opening of the coil 6. Then, the plunger 3 is inserted into the inner periphery of the cylinder 8 via the bearing 9 so as to reciprocate and slide.
An upper plate 10 that closes the other opening of the case 5, which is the back side of, is caulked and fixed at the opening end of the case 5 via an O-ring 11.

The plunger 3 has a substantially rectangular cross section, and a flow passage 12 is provided on the outer peripheral side thereof to allow the flow of fluid on both end surface sides of the plunger 3. The plunger 3 has a stepped through hole 31 penetratingly formed on the central axis thereof, and the diameter of the through hole 31 on the upper plate 10 side is large. One end of the rod 14 is inserted and fixed in the through hole 31 on the side of the center post 4, and the rod 14 reciprocates together with the plunger 3.

On the other hand, the through hole 3 on the upper plate 10 side
A fluid regulating member 13 is inserted and fixed to the first member 1. The fluid restricting member 13 has a substantially T-shaped cross section and has a hole inserting portion 13A which is inserted into the through hole 31 of the plunger 3 and a fluid restricting portion 13B which restricts the flow of fluid. 13A is inserted into the through hole 31 of the plunger 3 and reciprocates together with the plunger 3.

Further, the fluid regulating portion 13 of the fluid regulating member 13
B has a plate shape extending from the hole insertion portion 13A to both sides in the radial direction, and is arranged so as to face the opening of the flow path 12 of the plunger 3. Then, this fluid restriction unit 1
The opening side of the flow path 12 of 3B, the so-called plunger side surface 1
3C has a tapered surface whose diameter decreases toward the hole insertion portion 13A. In addition, the upper plate side surface 13D of the fluid restriction portion 13B also has a tapered surface that is reduced in diameter toward the rear side of the hole insertion portion 13A and toward the so-called central portion.

On the other hand, the center post 4 has a rectangular cross section, a part of which is inserted into the inner circumference of the other opening of the coil 6, and a step 41 provided on the outer circumference of the center post 4 is engaged with the end surface of the lower plate 7. Then the positioning is fixed.

The rod 14 fixed in the through hole 31 of the plunger 3 is reciprocally inserted into the inner periphery of the center post 4 via a rod bearing 15. Also,
A cylindrical shim 16 having a radially outward flange portion is fitted to an end portion of an inner peripheral portion of the center post 4 on the plunger 3 side.

The solenoid 1 constructed as described above is
It is attached to a hydraulic valve or the like of the other party (not shown).

When the solenoid body 2 is off, that is, when the control current is not applied to the coil 6, the plunger 3 receives the fluid pressure from the other valve through the port 17 formed through the center post 4. Then, the plunger 3 moves in a direction away from the center post 4 (hereinafter, referred to as B direction). Next, when the solenoid body 2 is on,
That is, when the control current is applied to the coil 6, the plunger 3 is magnetically attracted to the center post 4 and moves in the direction of contacting the center post 4 via the shim 16 (hereinafter, referred to as A direction). By reciprocating the plunger 3 in this manner, the mounting valve on the other side is controlled. At this time, the fluid in the solenoid 1 flows into the space between the end surface of the plunger 3 and the end surface of the upper plate 10 via the flow path 12 of the plunger 3.

In the solenoid having the above-mentioned structure, the plunger 3 is provided with the fluid regulating member 13 and the fluid regulating portion 13B is arranged so as to face the opening of the flow path 12, so that the plunger 3 is provided. When reciprocating, that is, when moving in the directions A and B, it impedes the flow of the fluid flowing from the flow path 12 to the space between the plunger 3 and the upper plate 10, and becomes a resistance when the plunger 3 moves.

More specifically, referring to FIG. 1B, when the plunger 3 moves in the A direction, the fluid flow from the flow path 12 is such that the fluid regulating portion 13B of the fluid regulating member 13 has a tapered side surface 13C of the plunger side surface 13C. In this case, the fluid flows inward and outward in the radial direction, which impedes the flow of the fluid and resists the movement of the plunger 3 in the A direction.

Further, when the plunger 3 moves in the B direction, the flow of the fluid flowing from the flow path 12 to the above space flows to the central portion due to the taper surface of the upper plate side end surface 13D of the fluid regulating portion 13B. , Which impedes the flow and resists the movement of the plunger 3 in the B direction.

In this way, the fluid control section 13B controls the flow of fluid. As a result, the responsiveness of the plunger 3 in the A and B directions when the solenoid 1 is turned on and off can be delayed. Further, since it is possible to suppress the minute vibration of the plunger 3 when the dither current is applied to the control current, it is possible to reduce the pulsation of the partner valve.

The solenoids according to the second to fourth embodiments of the present invention will be described below. In these examples, the shape of the fluid regulating portion of the fluid regulating member is changed. Since other configurations and operations are the same as those in the first embodiment, the same components are designated by the same reference numerals,
The description is omitted.

FIGS. 2A to 2D show a solenoid according to a second embodiment of the present invention. This embodiment responds to both directions A and B of the plunger 3 as in the first embodiment. It delays sex.

The fluid regulating member 131 in this embodiment is
In the fluid regulating member 13 of the first embodiment, the fluid regulating portion 131A is provided with a plurality of slits 131B formed through the outer peripheral surface in the axial direction in the circumferential direction. this is,
Since the front and rear surfaces of the fluid restricting portion 131A are tapered surfaces having a diameter that decreases toward the central portion, when the plunger 3 moves in the B direction, the outer peripheral portion may stick to the end surface of the upper plate 10. Yes, to prevent this.

FIGS. 2 (e) and 2 (f) show another embodiment of the above-mentioned suction preventing slits, in which slits 131C are radially formed on the outer peripheral portion of the upper plate side surface 13D.

FIG. 3 shows a solenoid according to a third embodiment of the present invention. In this embodiment, the response of the plunger 3 is delayed only in the A direction.

The fluid regulating portion 132A of the fluid regulating member 132 in this embodiment is the fluid regulating member 1 of the first embodiment.
3, the upper plate side surface 13D has an arcuate cross section protruding toward the upper plate 10 side.
Further, if such an arc shape is used, the upper plate 10
Against adsorption.

FIG. 4 shows another aspect of the fluid regulating portion in the third embodiment, in which the upper plate side surface 13D of the fluid regulating member 132 'is a trapezoidal fluid regulating portion 132A'. .

FIG. 5 shows a solenoid according to a fourth embodiment of the present invention. In this embodiment, the response of the plunger 3 is delayed only in the B direction.

The fluid restricting portion 133A of the fluid restricting member 133 in this embodiment is the same as the fluid restricting portion of the first embodiment except that the side surface of the plunger 3 is a tapered surface whose diameter increases from the hole inserting portion 13A toward the outer peripheral side. The outer peripheral surface is provided with a plurality of slits 133B for preventing adsorption to the upper plate 10 in the circumferential direction.

In each of the above-described embodiments, the case where at least one of the plunger side surface and the upper plate side surface of the fluid restricting portion of the fluid restricting member is formed with a taper surface whose diameter decreases toward the central portion has been described. However, even if the tapered surface is not formed, the fluid flow is restricted only by providing the fluid restriction member facing the opening of the flow path of the plunger as the movable member. It becomes resistance, which can delay the responsiveness of the movable member and suppress microvibration.

That is, in each of the above-described embodiments, the taper surface is provided on the fluid regulating portion of the fluid regulating member so that the flow of the fluid can be controlled and the response can be more reliably delayed and the minute vibration can be suppressed. It is a thing.

[0034]

According to the present invention having the above-described structure and operation, the fluid regulating member for regulating the flow of fluid from the flow passage is provided so as to face the opening of the flow passage in the movable member. The fluid restricting member blocks the flow of the fluid flowing from the flow path when the movable member moves, and serves as resistance when the movable member moves. As a result, the responsiveness of the movable member can be delayed, and minute vibrations of the movable member due to the dither current can be suppressed, so that the pulsation of the other valve can be reduced.

[Brief description of drawings]

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

2 (a) is an overall longitudinal sectional view of a solenoid according to a second embodiment of the present invention, FIG. 2 (b) is an enlarged view of a C portion of FIG. 2 (a), and FIG. FIG. 7C is a sectional view of the fluid regulating member, FIG. 11D is a right side view of FIG. 11C, and FIG. 8E is another example of the fluid regulating member according to the second embodiment. It is a cross-sectional view and FIG. 6F is the right side surface of FIG.

FIG. 3 (a) is an overall longitudinal sectional view of a solenoid according to a third embodiment of the present invention, and FIG. 3 (b) is an enlarged view of a portion C of FIG. 3 (a).

FIG. 4 (a) is an overall longitudinal sectional view of a solenoid of another aspect according to the third embodiment of the present invention, and FIG. 4 (b).
[Fig. 4] is an enlarged view of a C portion of Fig. 3A.

5 (a) is an overall longitudinal sectional view of a solenoid according to a fourth embodiment of the present invention, FIG. 5 (b) is an enlarged view of a C portion of FIG. 5 (a), and FIG. FIG. 7C is a sectional view of the fluid regulating member, and FIG. 8D is a right side view of FIG.

FIG. 6 is an overall vertical sectional view of a conventional solenoid.

FIG. 7 is an overall vertical cross-sectional view of another conventional solenoid.

[Explanation of symbols]

1 Solenoid 2 Solenoid Main Body 3 Plunger (Movable Member) 31 Through Hole 4 Center Post (Fixing Member) 41 Step 5 Case 6 Coil 7 Lower Plate 8 Cylinder 9 Bearing 10 Upper Plate 11 O-Ring 12 Flow Paths 13, 131, 132, 132 ', 133 Fluid regulation member 13A Hole insertion part 13B, 131A, 132A, 132A', 133A
Fluid regulation part 13C Plunger side surface 13D Upper plate side surface 131B, 131C, 133B Slit 14 Rod 15 Rod bearing 16 Shim 17 Port

Claims (1)

[Claims] 1. A movable member made of a magnetic material that is reciprocally inserted into the hollow interior of a hollow solenoid body, and a fixed member made of a magnetic material that is provided coaxially to face the movable member. And a magnetic body that magnetically attracts the movable member to the fixed member by applying a current to the solenoid body, wherein the movable member has a flow path that allows a fluid flow on both end surfaces of the movable member. The solenoid is characterized in that a fluid regulating member that regulates the flow of the fluid that has flowed through the flow passage is provided so as to face the opening of the flow passage during the movement.