JPH0374020B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to transformers used in various audio equipment, video equipment, industrial equipment, and the like.

Conventional Structure and Problems This type of transformer consists of two rectangular parallelepipeds with different dimensions, with their center lines being the same, as shown in Figure 1. They were housed in a substantially cross-shaped plastic case 1 that was assembled orthogonally to each other, and an insulating material such as wax or silicon was sealed therein. By housing it in the case 1, automatic assembly and inspection are possible, and it also has the features of high quality, high reliability, and high quality, such as eliminating self-ignition and reducing secondary defects.

However, since a plastic molded product is used for the case 1, the shape of the lower end surface of the case 1 bends inwardly or outwardly, making it difficult to insert the transformer body, which is one of the causes of assembly troubles. Currently, measures are being taken to improve the wall thickness and molding conditions, but these are not drastic and the result is a larger shape, which in turn leads to an increase in material costs and molding time. was the current situation.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned conventional drawbacks, and aims to improve parts yield, improve equipment operating rate, and further reduce case cost.

Structure of the Invention In order to achieve this object, the present invention consists of a corner portion of the opening surface at the lower end with a radius of small radius, a corner portion of the ceiling surface at the upper end with a radius of large radius, and a space between the corner portions at both ends. The main body of the transformer is housed in a plastic case that is formed with a continuously changing radius, and the corner on the ceiling side is closer to the center line of the case than the corner on the opening surface. be.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

That is, in the present invention, a corner portion 2 on the ceiling surface side of one rectangular parallelepiped of a case 1 made of approximately cross-shaped cylindrical plastic made by combining two rectangular parallelepipeds with different dimensions so that they are orthogonal to each other with the same center line. The radius of the radius is larger than that of the corner portion 3 on the opening surface side. Furthermore, the corner portions 2 and 3 at both ends are formed with a radius that continuously changes. Further, the corner portion 2 on the ceiling side is formed closer to the center line side of one of the rectangular parallelepipeds than the corner portion 3 on the opening side. By making the dimensions of the corner parts 2 and 3 of the case 1 larger than that of the corner part 3, the strength can be improved, especially the strength of the opening side, and the case 1 During molding, the flow of the resin is smooth due to the radius of the corner parts 2 and 3, and removal from the molding die can be performed smoothly, eliminating bending deformation, maintaining a predetermined shape, and reducing assembly troubles. In addition, the drawing taper is larger in shape, the formability is better, and the wall thickness can be made thinner, and the transformer body, which has a winding on the winding frame and a magnetic core incorporated therein, can be inserted into the case 1 from the opening surface. Since the side corner portions have a large diameter, effects such as ease of insertion can be obtained.

Effects of the Invention As described above, according to the transformer of the present invention, the strength of not only the ceiling surface but also the opening surface can be improved, and the resin flows smoothly during molding, making it possible to take it out from the molding mold smoothly. Unusual stress is not applied to the case, and bending and deformation of the case can be eliminated. This reduces assembly troubles, enables automatic insertion, and allows for a large draft angle of the case. In addition to improving moldability, the transformer body can be easily assembled and the case can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional transformer case, FIG. 2 is a perspective view of a transformer case according to an embodiment of the present invention, and FIG. 3 is a top plan view of the case. 1...Case, 2, 3...Corner section.

Claims (1)

[Claims] 1.It has an approximately cross-shaped cylindrical shape in which two rectangular parallelepipeds with different dimensions are combined so that their center lines are the same and perpendicular to each other, and the corners of the opening surface at the lower end of the four corners of one rectangular parallelepiped are rounded with a small radius. The corner of the ceiling surface at the top end is formed with a radius of large radius, and the corner on both ends is formed with a radius that changes continuously, and the corner on the ceiling side is made closer to the corner on the opening side. A transformer in which the main body of the transformer is housed within a plastic case shaped to lie on the center line side of a rectangular parallelepiped.