JP2533658Y2 - solenoid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a solenoid used as an actuator for various control valves, for example.

(Prior Art) As a conventional solenoid of this type, a solenoid which is small and requires a large suction force and has a movable plunger which moves in a relatively long stroke, as shown in FIGS. 3 and 4, for example, is known. ing. That is, the coil member
A center post 101 made of a magnetic material is inserted and fixed in the inner periphery of one opening of the coil 100, and a plunger 102 made of a magnetic material is inserted in the inner periphery of the other opening of the coil member 100 so as to be reciprocally movable. A rod 103 is fixed to the plunger 102, and the rod 103 is a through hole 10 provided in the center post 101.
4 is slidably inserted. Also, center post 101
Center post between plunger 102 and plunger 102
A coil-shaped spring 105 that urges the coil member 100 in a direction away from the coil 101 is mounted. It has become.

In order to increase the stroke of the plunger 102, it is necessary to increase the length of the spring 105. Therefore, one end of the spring 105 is connected to the inner periphery of the through hole 104 and the plunger 10
(2) The length of the spring 105 is ensured by being inserted into the gap between the outer periphery and the spring 105, and one end of the spring 105 is engaged with the spring seat 106 provided in the middle of the inner periphery of the through hole 104.

Furthermore, in order to circulate a fluid such as oil inside the solenoid, between the outer periphery of the spring 105 and the inner periphery of the through hole 104, and between the outer periphery of the rod 103 and the inner periphery of the tip end of the through hole 104 than the spring seat 106. In addition, a first gap 107 and a second gap 108, which serve as flow paths allowing the flow of the fluid, are provided.

(Problems to be Solved by the Invention) However, in the case of the above-described conventional technique, when the operation is repeated, the spring 105 may be caught in the second gap 108 between the tip of the rod 103 and the tip of the through hole 104. there were. That is, since there is the second gap 108 between the rod 103 and the inner periphery of the through hole 104, the rod 103 is moved right and left by the gap during operation. Second gap 10
8 is partially expanded, and it is considered that the end of the spring 105 engaged with the spring receiving seat 106 falls into the expanded gap. In particular, when the operation is repeated, the wear between the sliding surfaces progresses, and the second gap 108 becomes large, so that the second gap 108 is easily entangled.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and an object thereof is to provide a solenoid capable of preventing a spring from being caught without restricting a flow path for circulating oil or the like. Is to do.

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, a center post made of a magnetic material inserted and fixed to the inner periphery of one opening of the coil member, and the other of the coil member A plunger made of a magnetic material reciprocally inserted into the inner periphery of the opening, a coil-shaped spring for urging the plunger in a direction to separate the plunger from the center post, and coupled to the plunger, through an inner ring of the spring A rod slidably inserted into a through hole provided in the center post, a spring seat is provided in a part of the through hole, and one end of the spring is engaged with the spring seat. In the solenoid, a gap is formed between the outer periphery of the spring and the inner periphery of the through hole as a flow passage that allows the flow of fluid, and the inner diameter of the through hole is partially formed in the spring receiving portion. A spring guide for regulating the position of the spring.

(Operation) In the solenoid having the above configuration, since the outer periphery of the spring is pressed by the spring guide, the right and left deflection of the rod is pressed by the rod guide via the spring. Therefore, there is no danger that the rod will swing right and left and the gap between the rod and the inner periphery of the through hole ahead of the spring seat will expand, and the spring end will be prevented from biting into the gap.

In addition, since the outer periphery of the tip end of the spring is pressed by the spring guide, the gap between the outer periphery of the spring, which is a flow path, and the inner periphery of the through hole, and the gap between the rod beyond the spring seat and the inner periphery of the through hole can be secured. Fluid circulation can be ensured.

(Example) Hereinafter, the present invention will be described based on an illustrated example.
1 and 2 show a solenoid according to an embodiment of the present invention. The solenoid 1 includes a cylindrical case 2 made of a magnetic material, a coil member 4 housed in the case 2, and a magnetic material center inserted and fixed to the inner periphery of one opening of the coil member 4. Post 5 and coil member 4
A plunger 7 made of a magnetic material as a movable member inserted reciprocally through a sleeve 6 made of a non-magnetic material in the inner periphery of the other opening of the other, and a magnetic path between the case 2 and the plunger 7 are formed. A yoke plate 11 made of a magnetic material.

The case 2 is a cylindrical member having a mounting bracket 30 provided on the outer periphery, and a washer-shaped fixing plate 8 at one end thereof.
, The center post 5 is integrally connected and fixed. One end surface of the coil member 4 housed in the inner periphery of the case 2 is in contact with the fixed plate 8.

An opening on the side of the plunger 7 of the case 2 has a connector provided with an electric connection terminal 9 for supplying electricity to the coil member 4.
10 is fitted and fixed. A sealed space is formed between the connector 10 and the center post 5 in which the plunger 7 is reciprocally inserted. That is, a concave portion 10a having the same diameter as the inner diameter of the bobbin 3 of the coil member 4 is provided on the inner end surface of the case of the connector 10, and the inner periphery of the concave portion 10a and the inner periphery of the coil portion 3 are continuous on the same surface. One end of the sleeve 6 is fitted to the inner periphery of the concave portion 10a, and the other end is inserted between the outer periphery of the center post 5 and the bobbin 2.

Also, in order to increase the suction force and increase the stroke of the plunger 7, the tip of the plunger 7 projects in a truncated cone shape toward the center post 5, while the end face of the center post 5 projects the plunger. A truncated conical recess 13 is provided in accordance with the shape of the portion 12, so that a magnetic attractive force acts between the conical inclined surfaces facing each other.

On the other hand, a rod 14 is integrally fixed to the plunger 7, and the rod 14 is slidably inserted into a through hole 15 provided in the center post 5. A coil-shaped spring 16 is interposed between the center post 5 and the plunger 7 to bias the plunger 7 away from the center post 5. This spring 16 is a rod
14 is slidably inserted into the outer periphery, one end is engaged with the plunger 7, and the other end is inserted into the gap between the inner periphery of the through hole 15 and the outer periphery of the plunger 7, and is provided in the middle of the inner periphery of the through hole 15. It is engaged with the seat 17. A first flow path that allows the flow of fluid is provided between the outer circumference of the spring 16 and the inner circumference of the through-hole 15 and between the outer circumference of the rod 14 and the inner circumference of the tip end of the through-hole 15 than the spring seat 17. , Second gaps 21 and 22 are provided to circulate a fluid such as oil in the solenoid 1. In addition, the end of the center post 5
An inflow port 20 for oil or the like that opens in the second gaps 21 and 22 is open. On the other hand, a groove 23 extending in the axial direction
The groove 23 constitutes an outflow path for oil or the like.

A spring guide 18 that contacts the outer periphery of the spring 16 is provided in the spring seat 17 at the inner periphery of the through hole 15. The spring guide 18 is formed by narrowing the inner circumference of the through hole 15 to about the middle between the first gap 21 and the base 2 gap 22, and the inner circumference is in full contact with the outer circumference of the end of the spring 16. .

In the solenoid having the above configuration, when the coil member 4 is energized, the center post 5, the plunger 7, the yoke plate
11, a closed loop-shaped magnetic path returning to the center post 5 is formed through the case 2 and the fixing plate 8, and the plunger 7 is magnetically attracted toward the body 5.

Since the outer periphery of the spring 16 is pressed by the spring guide 18, the right and left displacement of the rod 14 is pressed by the spring guide 17 via the spring 16.
Therefore, there is no possibility that the rod 14 will swing right and left and the second gap 22 at the tip of the center post 5 will expand, and the end of the spring 16 will be prevented from biting into the second gap 22.

Also, since the outer periphery of the tip end of the spring 16 is pressed by the spring guide 18, the first gap 21 between the outer periphery of the spring 16 and the inner periphery of the through hole 15 serving as a flow path, and the spring seat 17 are formed.
The second gap 22 between the further rod 14 and the inner circumference of the through hole 15 can be secured, and the circulation of fluid such as oil can be secured.

(Effects of the Invention) The present invention has the above-described configuration and operation. Since the spring guide that guides the outer periphery of the spring is provided in the spring receiving portion, it is possible to prevent the rod from swinging left and right through the spring. Thus, it is possible to prevent the spring from being caught in the gap between the rod and the inner periphery of the through hole without restricting the flow of the fluid such as oil into the solenoid.

[Brief description of the drawings]

1 and 2 show a solenoid according to an embodiment of the present invention. FIG. 1 is a sectional view of a main part, FIG. 2 is a longitudinal sectional view showing the entire structure, and FIG. 3 is a conventional solenoid. And FIG. 4 is an enlarged sectional view of a main part of FIG. DESCRIPTION OF SYMBOLS 1 ... solenoid 2 ... case 3 ... bobbin 4 ... coil member 4a ... coil winding 5 ... body 6 ... sleeve 7 ... plunger 8 ... fixed plate 9 ... Terminal 10 ... Connector, 11 ... Yoke plate 12 ... Protrusion, 13 ... Recess 14 ... Rod, 15 ... Through hole 16 ... Spring, 17 ... Spring seat 18 ... Spring guide, 20 …… Inlet 21 …… First gap, 22 …… Second gap 23 …… Groove

Claims (1)

(57) [Scope of request for utility model registration] A center post made of a magnetic material inserted and fixed in the inner periphery of one opening of the coil member; a plunger made of a magnetic material inserted reciprocally in the inner periphery of the other opening of the coil member; A coil-shaped spring for urging the plunger in a direction to separate the plunger from the center post; Wherein a spring seat is provided in a part of the through hole, and one end of the spring is engaged with the spring seat, wherein a fluid flows between the outer periphery of the spring and the inner periphery of the through hole. A spring which is provided with a gap that becomes a flow path that allows the spring to have a diameter smaller than the inner diameter of the through hole partially in the spring receiving portion and regulates the position of the spring. Solenoids, characterized in that a guide.