JPH0356008Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention involves inserting one leg of the U-shaped core from the side of the electromagnetic coil into the center hole of the coil, and inserting the exposed end of the core. The present invention relates to a solenoid in which movable pieces are arranged opposite to each other, and more particularly relates to a holding structure for the core.

(B) Prior art This type of solenoid is constructed by inserting one leg of a U-shaped core into the center hole of the electromagnetic coil from the side of the frame of the electromagnetic coil, and inserting the leg of the core into the center hole of the electromagnetic coil. A movable piece is disposed close to the core end exposed on the opposite side, and the core holding structure is such that the frame of the electromagnetic coil and the core are simultaneously locked with screws or the like.

(c) Problems that the invention aims to solve However, due to the miniaturization of the solenoid, space problems arose, and as mentioned above, it became impossible to lock the core and the electromagnetic coil frame at the same time. In this case, the core is not locked in any way, so it moves freely when vibration shock is applied.
This had the disadvantage that the electrical characteristics became unstable.

For this purpose, a dowel is formed that protrudes from the inner surface of the square hole into which the core leg of the electromagnetic coil frame is inserted, so that the core leg is held against the lower surface of the square hole.

However, in the case of a structure in which the core is locked in the thickness direction, there are large variations in the thickness dimension due to the material properties, so there are disadvantages such as troublesome management of materials, dimensions, and prevention of slipping out. can be,
Further, even those having a structure in which the core is locked in the width direction of the core have the same disadvantages as the materials, dimensions, and management are troublesome.

There was a drawback that the frame of the electromagnetic coil was thermally deformed due to the rise in temperature after voltage was applied to the solenoid, and the force pushing the core against the bottom surface of the square hole of the electromagnetic coil was reduced, causing the core to come out.

Another method is to fix the core and the electromagnetic coil frame with adhesive, but the disadvantage is that the COST is high and the amount of adhesive varies.If there is less adhesive, the core will be difficult to hold; The adhesive adheres to the contact surface of the movable piece and the core, causing electrical damage.
The drawback was that the mechanical properties deteriorated.

(d) Means for solving the problem The embodiment will be explained based on the drawings of FIGS. 1, 2, and 3. The electromagnetic coil is inserted into the center hole of the frame 5 (hereinafter referred to as the frame). Make a dent 3 on one leg 2 of the core.

Also, a locking member 6 having a portion that contacts the end surface of the frame 5 and insertable into the center hole of the frame 5, a locking member 6 formed in a so-called U-shape.
A dowel having the same shape as the core dent is attached to the part to be inserted into the frame center hole at a height higher than the core dent 3 and taking into account variations in the thickness direction of the core.

As shown in Figures 1 and 2, one leg 2 of the U-shaped core 1 with the dent 3 and the frame insertion part with the U-shaped locking member dowel 7 attached to the frame. The core was inserted from the opposite direction of the center hole and assembled as shown in FIG. 3 so that the dowel 7 and the dent 3 were engaged to prevent the core from coming off.

(E) Functions and Examples After assembling the solenoid as described above, when a force is applied to the core 1 in the direction of withdrawal by engaging the dent 3 of the core with the dowel 7 of the locking member, the U-shaped locking member 6 Since it is in contact with the end surface of the frame 5, the locking member 6 serves as a stopper for the core. Also, when force is applied to the locking member 6 in the withdrawal direction, the U-shaped core 1
Since the core 1 is in contact with the end surface of the frame 5, the core 1 serves as a stopper of the locking member.

Furthermore, the core and the locking member are sandwiched from both end surfaces of the frame 5, eliminating play in the insertion and removal directions.

In addition, since the dowel 7 of the locking member is higher than the dent 3 of the core, the dowel of the locking member and the dent of the core engage, pushing the locking member and the core upward and downward on the surface of the center hole of the frame. This will eliminate vertical wobble.

(F) Effects As explained in detail above, according to the present invention,
By simply adding a locking member and a simple additional work to the core, the frame of the electromagnetic coil can be firmly held, eliminating the core's movement and providing a way to hold the core.

This does not change the electrical characteristics,
The practical effects are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a solenoid according to an embodiment of the present invention, and FIG. 2 is a necessary sectional view of the right side of the embodiment.
FIG. 3 shows an embodiment of the present invention. 1... Core, 2... One leg of the core, 3...
Core dent, 4... Coil, 5... Coil frame, 6... Locking member, 7... Dowel of locking member, 8... Movable piece.

Claims (1)

[Scope of utility model registration request] In a solenoid formed by inserting one leg of a U-shaped core from the side of an electromagnetic coil, the locking member has a portion that abuts the end surface of the bobbin and is insertable into the center hole of the bobbin. A solenoid, which is inserted into a center hole of a bobbin, and has an uneven surface on a contact surface of a leg portion of a core for engagement.