JPH0715122Y2 - Coil bobbin with core fixing bracket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In the present invention, when forming a transformer or a coil, an E type and an I type are used.
Type or E type and E type magnetic cores are assembled and fixed by butt fixing
The present invention relates to a structure of a coil bobbin for a transformer coil that winds a winding, in which a metal fitting for fixing the core is attached to the coil bobbin in advance and the core is fixed to the coil bobbin.

In a conventional transformer and coil, as shown in FIG. 1, the coil bobbin is a horizontal type, and a pair of upper flanges 2 are provided on the upper and left upper parts of the core 1 and a pair of lower flanges is provided on the lower part of the core. 5, the lower flange 5 is provided with a horizontally projecting pin 6 and a hanging pin 7. To fix the magnetic core mounted and abutted on the coil bobbin, an insulating tape may be wound around the core several times to be fixed, or the abutting portion of the magnetic core may be adhesively fixed with a resin, or a metal fitting having a spring property may be used. Then, the core is fixed from the outer periphery of the core. In these conventional methods, it takes time to fix the outer circumference of the core with the insulating tape, and in the method of adhesively fixing the core abutting surface, it is necessary to press the core after adhesion, and it takes time to fix the resin. In short, in the method of fixing the core with the metal fitting, there is a problem that the outer dimension is large and the outer shape is not constant, and the core is once unfolded and then mounted, which makes automation difficult.

In order to eliminate the above drawbacks, the present invention has an upper collar projecting to the upper and left upper portions of the core of the coil bobbin, and each has a claw portion bent into a metal L-shape having a spring property for fixing the core to the bobbin in advance. A rod-shaped metal fitting having a circular cross-section is attached, and when the core is attached to the coil bobbin, it is fixed by the L-shaped bent claw portion of the rod-shaped metal fitting made of metal spring. The rod-shaped metal fitting and the bobbin are integrally formed in advance as a coil bobbin.

In the present invention, in the coil bobbin having the rod-shaped metal fitting having the L-shaped bent claw for mounting and fixing the core, the bobbin material is a molding resin such as ABS resin or phenol resin, and the claw is provided. The rod-shaped metal fitting for fixing the core is integrally formed at the time of resin molding of the coil bobbin, and firmly fixed to the coil bobbin.

An embodiment of the present invention will be described with reference to the drawings. 2, 3 and 4 show an embodiment of the present invention. FIGS. 2 to 4 are perspective views showing the rod-shaped metal fitting 3 having the claw portions 8 bent in the L shape on the upper flanges 2 on the left and right of the core 1 of the coil bobbin. One or several L-shaped bent claws 8
In the example, one or two metal rods are used as the rod-shaped metal fitting having a circular shape and having a spring property, but a plurality of metal rods may be used. In FIG. 2, reference numeral 1 is a core of a coil bobbin, and a conductive wire is wound around the core 1 to form a coil and a transformer. The terminal of each conductor is connected to a horizontally extending pin 6 and a hanging pin 7 in which the core of the coil bobbin is inserted, and the horizontally extending pin 6 and the hanging pin 7 are connected to a through circuit. Reference numeral 2 is an upper brim on the upper right and left sides of the core of the coil bobbin, and a bar-shaped metal fitting 3 having a circular cross section having an L-shaped bent claw 8 extending horizontally in the longitudinal direction of the coil bobbin is attached to this upper flange. The rod-shaped metal fitting 3 has an L-shaped bent claw portion 8 which is in contact with the back surface of the core, has a curved line so that the back surface of the core is smoothly fixed and pressed, and facilitates contact with the core. Figure-
3 is an enlarged perspective view showing a rod-shaped metal fitting 3 having a circular cross section, which has a claw portion 8 bent in an L shape on the upper collar 2 of the coil bobbin. That is, the case where two rod-shaped metal fittings 3 (two pairs) are provided on the upper brim 2 on one surface on the upper left side of the core 1 is shown, and with the claw portion 8 in which the back surfaces of the two cores are bent into an L-shape, It holds and fixes. FIG. 4 is a perspective view when two E-shaped cores 2 are mounted on the coil bobbin of FIG.
As a horizontal coil bobbin, the core is structured so that it can be pressed against the bottom surface of the bobbin.Therefore, a metal fitting is provided on the upper collar, and the circular cross-section claw for pressing the core bends at about a right angle to make contact with the core. The face is further curved inward. Further, the length of the claw portion is not required up to the central portion on the back surface of the coil, and the rod-shaped metal fitting presses the core against the lower surface of the bobbin, and does not come off due to vibration or the like. The length of the claw portion 8 may be such that the claw portion of the rod-shaped metal fitting does not come off from the core. Therefore, when the core 4 is attached to the core of the coil bobbin, the claw portion of the rod-shaped metal fitting having the spring property bent in the L shape is rotated around the coil bobbin mounting portion and pushed up by a finger to move the core of the coil bobbin. The core may be mounted on the coil bobbin by moving horizontally from the left and right sides to the coil bobbin surface. Further, since the rod-shaped metal fitting and the claw portion have a circular cross section, they can rotate.

The coil bobbin with the rod-shaped metal fitting according to the structure of the present invention,
It is not necessary to wind and fix the outer periphery of the core several times with the insulating tape, and therefore it is not necessary to bond the core butting surface with resin. In addition, the core pressing metal fitting after adhesion is no longer necessary, and resin fixation is also unnecessary. In addition, the overall external dimensions are smaller than in the prior art, and the core can be fixed to the coil bobbin simply by pushing up the rod-shaped metal fitting with a finger, and it is possible to provide a coil bobbin having a novel core pressing metal fitting suitable for automatic core assembly.

[Brief description of drawings]

Fig. 1. A perspective view showing a conventional coil bobbin. FIG. 2 is a perspective view showing a coil bobbin with a rod-like metal fitting having a pair of claws of the present invention. FIG. 3 is an enlarged perspective view showing a coil bobbin with a rod-like metal fitting having two pairs of claws of the present invention. Fig.-4. A perspective view of the coil bobbin of Fig. 3 when the core is mounted and assembled. 1 ... Core, 2 ... Upper collar (of coil bobbin), 3 ... Rod-shaped metal fitting, 4 ... Core, 5 ... Lower collar, 6 ... Horizontally extending pin, 7 ... Hanging pin, 8 ... ... (L-shaped bent) claws.

Claims (1)

[Scope of utility model registration request] 1. A horizontal coil bobbin having a winding wound around it, in which Ls are respectively provided on the upper and left upper flanges of the cores of the coil bobbin.
A spring-like rod-shaped metal fitting having a circular cross section having a bent claw portion is integrally provided on the coil bobbin, and after the core is mounted on the coil bobbin, the core is fixed to the coil bobbin by the claw portion of the rod-shaped metal fitting. A coil bobbin with a core fixing metal fitting.