JP2513690Y2 - solenoid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a solenoid used for various oils, solenoid valves for controlling pneumatic equipment, and the like.

(Prior Art) As a conventional solenoid of this type, for example, there is a long stroke type solenoid as shown in FIG. This solenoid 100 includes a center post 101 and a plunger 102.
By making each suction surface of the cone a conical surface, the suction force at the start of pulling from the OFF state to the ON state is increased to realize a long stroke.

That is, the shapes of the suction portions of the plunger 102 and the center post 101 are conical protrusions that can be fitted into each other so that they can be pulled out from each other.
The concave and convex portions 103 and the conical concave portion 104 are formed. By doing so, even if the distance in the stroke direction of the plunger 102 is large, the outer circumference of the conical convex portion 103 and the conical concave portion 1 through which the magnetic flux passes.
04 Since the gap between the inner peripheral surfaces is small, a large suction force can be obtained.

(Problems to be solved by the invention) However, in the above-described conventional structure, the suction performance at the time of stroke is improved by reducing the distance between the suction surfaces, while the plunger 102 and the sleeve that guides the stroke of the plunger 102 are improved. Since there is a gap between 105 and the suction force also acts in the direction perpendicular to the stroke, the edge of the conical convex portion 103 of the center post 102 and the inner surface of the conical concave portion 104 of the plunger 102 near the ON-side stroke end. It is easy for the contacts to occur. If contact occurs, problems such as stroke inability and unstable hold in the ON state occur.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and its object is to provide an edge portion of a conical convex portion of a suction portion and a conical concave portion even if the distance between the suction surfaces is reduced. Another object of the present invention is to provide a solenoid that can surely hold in the ON state without causing contact with each other and lowering the attraction force characteristic.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, a center post serving as a fixed iron core and a movable iron core arranged so as to reciprocate coaxially with the sensor post are provided. A solenoid having a plunger and a coil arranged so as to surround the outer circumference of the center post, wherein the suction portions of the plunger and the center post have conical concavo-convex shapes that can be removably fitted to each other. The inner peripheral shape of the conical concave portion of the suction portion of the plunger and the center post is a conical surface that follows the outer peripheral conical surface of the conical convex portion from the opening side to the inner side, and the conical surface continues from the conical surface. Also has a relief surface that forms a gap between the outer periphery of the tip of the conical convex portion by increasing the inclination.

 The relief surface is preferably a cylindrical surface.

(Operation) In the solenoid having the above configuration, when the coil is turned on, the plunger is magnetically attracted toward the center post, and the conical convex portion of the suction portion is inserted into the conical concave portion. Then, near the stroke end of the plunger, the tip of the conical convex portion reaches the relief surface portion from the conical surface in the conical concave portion, and a gap is created between the tip of the conical convex portion and the relief surface, and the tip of the conical convex portion is formed. There is no possibility that the edge portion contacts the inner circumference of the conical recess.

If the relief surface is a cylindrical surface, processing can be facilitated.

(Embodiment) Hereinafter, the present invention will be described based on an illustrated embodiment.
1 and 2 showing a solenoid according to an embodiment of the present invention, reference numeral 1 denotes the entire solenoid, which is a coil 2, a case 3 in which the coil 2 is housed, and a hollow hole 21 of the coil 2. A center post 4 made of a magnetic material as a fixed iron core fixed to the inner circumference, a plunger 5 as a movable iron core made of a magnetic material that is reciprocally mounted coaxially with the center post 4, and the plunger 5 And a spring 6 that urges the post 4 away from the post 4. The plunger 5 is reciprocally guided through the sleeve 7 and the inner peripheral surface of the bobbin 8 of the coil 2.

One of the suction portions of the plunger 5 and the center post 4 which face each other is a conical convex portion 11, and the other is a conical concave portion in which the conical convex portion 11 can be removably fitted into the conical concave portion. In this embodiment, the suction portion on the side of the center post 4 is a conical convex portion 11, and the suction portion on the side of the plunger 5 is a conical concave portion 12.

The inner peripheral shape of the conical recess 12 has a conical surface 13 having a diameter that gradually decreases from the opening side toward the back, a cylindrical surface 14 as a relief surface following the conical surface 13, and a flat bottom surface 15 at the back end. are doing. The range of the cylindrical surface 14 is selected according to the shape and size of each part, but it is preferably about 1/5 to 1/6 of the conical surface 13.

On the other hand, the conical convex portion 11 of the center post 4 has a truncated cone shape having a conical surface 16 that gradually becomes thinner toward the tip and a flat top surface 17 thereof.

Then, when the conical convex portion 11 completely enters the inside of the conical concave portion 12, the top surface 17 of the conical convex portion 11 becomes the bottom surface 15 of the conical concave portion 12.
And the conical surface 13 of the conical projection 11 closely contacts the inner circumference of the conical surface 13 of the conical recess 12, and the conical surface 16 of the conical projection 11 and the cylindrical surface 14 of the conical recess 12 A gap g is formed between them.

In the solenoid 1 having the above-described configuration, when the stroke end is close to the ON side, the tip of the conical convex portion 11 moves from the inner peripheral conical surface 13 of the conical concave portion 12 to the cylindrical surface 14, and the conical concave portion of the plunger 5 is moved. There is no possibility that the inner side surface 12 and the tip edge portion of the conical convex portion 11 of the center post 4 come into contact with each other. Therefore, the distance between the suction surfaces of the center post 4 and the plunger 5 can be reduced to improve the suction force characteristic.

In this embodiment, as the relief surface, the cylindrical surface 14 is formed, but in short, a gap may be formed between the tip of the conical convex portion 11 and the outer peripheral conical surface 16, and the inclination angle is larger than the inclination angle of the outer peripheral conical surface 16. May be a slope with a large
It is possible to take various structures for forming.

Further, in this embodiment, the conical convex portion 11 has the center post 4
And the conical recess 12 is provided in the plunger 5,
On the contrary, the conical projection 11 may be provided on the plunger 5 and the conical recess 12 may be provided on the center post 4.

(Effects of the Invention) The present invention has the above-described configuration and operation, and provides a relief surface for escaping the outer periphery of the tip end of the conical projection on the inner circumference of the conical recess of the suction portion between the plunger and the center post. Therefore, during the plunger stroke, stability of the conical convex tip and the conical concave bottom surface of the suction part between the center post and the plunger is maintained in the ON state without deteriorating the attractive force characteristic at the beginning of pulling, which is particularly important for long strokes. The contact can be obtained, which can improve the hold ability in the ON state.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an ON state of a solenoid according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of an OFF state of the solenoid of FIG. 1, and FIG. 3 is an ON / OFF state of a conventional solenoid. FIG. 4 is a vertical cross-sectional view in which the plungers are combined into one by drawing them half by half. Explanation of symbols 1 …… Solenoid, 2 …… Coil 21 …… Hollow hole, 3 …… Case 4 …… Center post, 5 …… Plunger 6 …… Spring, 7 …… Sleeve 8 …… Bobbin, 11 …… Cone Convex part 12 …… Conical concave part, 13 …… Conical surface 14 …… Cylinder surface (relief surface) 15 …… Bottom surface, 16 …… Outer peripheral conical surface 17 …… Top surface, g …… Gap

Claims (2)

(57) [Scope of utility model registration request] 1. A center post as a fixed iron core, a plunger as a movable iron core arranged coaxially with the center post so as to be reciprocally movable, and a coil arranged so as to surround the outer circumference of the center post. In a solenoid in which the suction portions of the plunger and the center post have conical concave and convex shapes that can be inserted into and removed from each other, the inner peripheral shape of the conical concave portion of the suction portion of the plunger and the center post is opened. Between the conical surface that follows the outer peripheral conical surface of the conical convex portion from the side toward the inner side, and the conical convex surface that follows the conical surface and has a greater inclination than the conical surface and the outer peripheral conical surface of the tip portion of the conical convex portion. A solenoid having a structure having an escape surface for forming a gap in the. 2. The solenoid according to claim 1, wherein the relief surface is a cylindrical surface.