JPH0736410U - solenoid - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] The stroke adjustment, removal prevention, and rotation prevention of the solenoid movable iron core are performed without adding the number of parts to the conventional structure, and an inexpensive solenoid is provided. The purpose is to do. The above object is realized by forming a planar shape on a part of a movable iron core of a cylinder and a part of an inner diameter of a coil bobbin of the cylinder.

Description

[Detailed description of the device]

[0001]

[Field of Invention]

 The present invention relates to a solenoid structure in which a movable bobbin slides with a coil bobbin.

[0002]

[Prior art]

 When the coil is energized, the movable iron core is attracted to the fixed iron core, and when the energization is cut off, the return spring returns the movable iron core to its original position by another external action. Various methods have been conventionally used for the form of stroke (position) suppression and retaining functions.

FIG. 1 is a basic structural diagram of a solenoid. When a voltage is applied to a coil 1, a magnetic flux flows in a magnetic circuit composed of a plate 2, a frame 3, a fixed iron core 4 and a movable iron core 5 to move the coil. The iron core 5 is attracted to the fixed iron core 4 side to be attracted. Fig. 1 shows the adsorption state.

Here, in order to suppress the stroke of the movable iron core 5 and to prevent the movable iron core 5 from coming off, it is common to attach an E-ring to the non-magnetic shaft 6 connected to the tip of the movable iron core 5. Has been done in. In the case of such a method, in order to connect the shaft 6, it is necessary to provide a hole in the central portion of the fixed iron core 4 and the movable iron core 5, and (2) this causes a loss of magnetic force and thus an attractive force. It has the drawback of decreasing. Reference numeral 8 is a coil bobbin around which the coil 1 is wound. Further, a cushioning material 9 is provided to reduce noise when the E ring 7 hits the fixed iron core 4 when the shaft 6 moves.

[0005]

[The purpose of the device]

 In the present invention, a part of the sliding surface of the coil bobbin and the movable iron core is made into a flat shape, so that the stroke of the movable iron core is suppressed, and the three elements of the retainer and the rotation preventer are greatly added to the number of parts and the assembly process. It can be reduced and implemented.

[0006]

【Example】

 2 shows an embodiment of the present invention, 1 is a coil, 2 is a plate, 3 is a frame, 4 is a fixed iron core, 5 is a movable iron core, and 8 is a coil bobbin. FIG. 3 is a perspective view of the coil bobbin of the present invention, and FIG. 4 is a perspective view of the movable iron core of the present invention. As shown in FIGS. 3 and 4, the movable iron core 4 and the coil bobbin 8 are partially formed into the planar shapes a and b, respectively, so that the movable iron core 4 operates at the end as described above and terminates in the planar shape a of the movable iron core 4 when restored. Since it stops by hitting the end of the planar shape b of the coil bobbin 8, it is not necessary to attach an E-ring to prevent the coil bobbin 8 from coming off.

With this structure, the movable iron core 4 and the coil bobbin 8 alone can prevent the movable iron core 4 from coming off, preventing rotation, and suppressing strokes, so that the number of parts can be reduced and the assembly time can be reduced. Since it can be shortened, the overall cost can be reduced. Further, since it is unnecessary to process the movable iron core 4 and the fixed iron core 5 unnecessarily, the loss of magnetic force is kept to a minimum and the attraction force is not lowered.

[0008]

[Explanation of effect]

 With the solenoid of the present invention, it is possible to provide a cheap solenoid (3), because stroke adjustment of the movable iron core, removal prevention, and rotation stop can be realized without adding the number of parts.

[Brief description of drawings]

FIG. 1 is a structural diagram of a conventional solenoid

FIG. 2 Structure of the solenoid according to the present invention

FIG. 3 Coil bobbin of the present invention

[Fig. 4] Movable iron core of the present invention

[Explanation of symbols]

 1 coil 2 plate 3 frame 4 fixed iron core 5 movable iron core 6 shaft 7 E ring 8 coil bobbin 9 buffer material a planar shape of movable iron core b planar shape of coil bobbin

Claims (1)

[Scope of utility model registration request] 1. A solenoid comprising a coil wound around a coil bobbin, a frame or case of a magnetic body surrounding the coil and a fixed iron core and a movable iron core of the magnetic body, wherein the movable iron is A solenoid, wherein a part of an inner diameter of the coil bobbin, which is a sliding portion of the core and the movable iron core, has a planar shape.