JPH0635454Y2 - Small transformer winding end insulation fixture - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to an insulating fixture for winding ends of a small transformer used in a household electric appliance as well as a microwave oven.

2. Description of the Related Art Conventionally, a coil of a small transformer of this type is manufactured by winding an electric wire such as an enamel wire along a winding frame by a winding machine. The ends of the windings are end-treated as shown in FIG.

Here, a conventional method of terminating windings in a small transformer will be described.

That is, as shown in the figure, the starting end a of the coil 10 is sequentially wound from one end to the other end of the inner edge (not shown) and from one layer to multiple layers,
The coil end b is separated from the winding outer surface of the coil 10 in the same direction as the start end a.

The starting end a is insulated from the upper side of the coil 10 by the first insulating paper 11 with the upper surface of the coil 10, and is drawn out from the outlet 13 opening to the second insulating paper 12 stacked on the first insulating paper 11, A terminal 14 such as a crimp terminal is caulked to the portion. The terminal end b is drawn from the outer surface of the coil 10 through a drawing groove 15 that opens to the first insulating paper 11 and a drawing port 16 that opens to the second insulating paper 12, and a terminal 14 such as a crimping terminal is provided at the end thereof. Connected by caulking.

The first insulating paper 11 and the second insulating paper 12 are of the same quality, and an insulating paper such as Amirad paper which is bent and formed in an L shape is used.

After the above treatment, the insulating tape 17 is wound between the outlets 13 and 13 so as to be orthogonal to the winding direction of the coil 10, and both insulating papers are wound.
The coils 11 and 12 are fixed to the coil 10.

However, the drawing-out end of the coil bends the wound winding wire and comes to the position of the drawing-out port.
1 and 12 merely maintain insulation, and do not mechanically fix the drawer end. Therefore, when the terminals 14 and 14 are connected to the socket of the counterpart device and the diameter of the winding is small (about 1 mm or less), the mechanical strength of the winding end is not sufficient and the winding end May bend.
Further, there is a drawback that the inclination angle of the winding end portion after connection cannot be kept constant.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an insulating fixture capable of sufficiently maintaining the strength of the winding end portion even with a winding having a small wire diameter.

Means for Solving the Problems A winding end insulating fixture for a small transformer according to the present invention has an L-shaped portion that abuts an outer surface of a coil, and a protrusion near both ends of an outer vertical surface of the L-shaped portion. A pair of convex portions formed, and in order to hold the winding end portion pulled out from the lower side of the coil in an obliquely upward direction, an outer surface of the convex portion with respect to the outer vertical surface And a fixing groove is formed in an obliquely upward direction, and the fixing groove has an L-shaped groove cross section, is formed in the depth direction of the outer surface of the convex portion, and has the winding end. And a terminal fitting groove into which a crimping connection portion, which is a crimp terminal crimped and connected to the winding end portion, is formed on the inner side of the opening portion. Is characterized by.

Action First, the winding end is pulled out from the lower side of the coil. With the winding end insulating fixture slightly separated from the coil, the pulled-out winding end is inserted into the opening of the fixing groove formed in the protrusion on the insulating fixture side. Then, the winding end insulation fixture is brought close to the coil to bring the L-shaped portion into contact with the outer surface of the coil.

Since the fixing groove is formed so as to be directed obliquely upward with respect to the outer vertical surface of the L-shaped portion, when the L-shaped portion is in contact with the outer surface of the coil, The middle part is curved and the tip of the winding end portion is directed obliquely upward. At the same time, the middle part of the winding end is curved,
The winding end portion is drawn inside the opening, and the base end portion of the crimp terminal crimp-connected to the winding end portion fits into the terminal fitting groove. With this, the winding end pulled out from the lower side of the coil is held diagonally upward by the winding end insulating fixture together with the crimping connection portion.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 (A) is an external perspective view showing a winding end insulation fixture of a small transformer according to the present invention, and FIG. 1 (B) is an external perspective view showing a state in which the insulation fixture of the present invention is attached to a coil. Is. The same parts as those of the conventional technique are designated by the same reference numerals.

In the figure, 10 is a coil wound in the same manner as the conventional one, and the winding end portion is caulked to a terminal 14 such as a crimp terminal.

Reference numeral 20 denotes an insulating fixture, which is made of a synthetic resin material and has an L-shaped portion 21 and an L-shaped portion 21 formed in an L-shape.
The projections 22 and 22 are formed near both sides of the outer vertical surface 211.

One surface of each of the convex portions 22 and 22 is formed in a polygonal column having an inclined surface projecting upward toward the outside, that is, each overhang shape. A fixed groove 23 is formed in each of the protrusions 22 and 22 so as to penetrate upward and have a L-shaped cross section in a plan view.

The fixed groove 23 includes an opening 24 and a terminal fitting groove 25. The opening 24 has one side forming an L-shape along the inclined surface, and the winding end is formed so that the winding end can be inserted from the opening 24. The terminal fitting groove 25 is the other side forming the L shape, and is formed so that the base end portion of the crimp terminal 14 can be fitted therein.

The height of the outer vertical surface 211 of the L-shaped portion 21 is slightly higher than the winding height of the coil 10.
A notch 26 that opens upward is provided at the center of the upper edge.

Next, the procedure of the work of fixing the winding end portion by the insulating fixture 20 of the present invention will be described.

First, the winding end portion is drawn straight out from the lower side of the coil 10 toward the outside of the coil 10, and in this state, the crimp terminal 14 (caulking connection portion) is caulked to the tip of the winding end portion. Next, with the insulating fixture 20 slightly separated from the coil 10, the drawn winding end is inserted into the opening 24 of the fixing groove 23. Then, insulate the fixture 20 about 45 degrees (L-shaped part 21
(Corresponding to the angle of the inclined surface on the outer side of the convex portion 22 with respect to the outer vertical surface 211), the L-shaped portion 21 is brought into contact with the outer surface of the coil 10 while approaching the coil 10.

Since the fixing groove 23 is formed so as to be obliquely upward with respect to the outer vertical surface of the L-shaped portion 21, the outer vertical surface 211 of the L-shaped portion 21 is brought into contact with the outer surface of the coil 10. In this state, the middle portion of the winding end portion is curved, and the crimp terminal 14 faces diagonally upward. At the same time, the middle portion of the winding end portion is curved, so that the winding end portion is drawn inside the opening 24, and the base end portion of the crimp terminal 14 is fitted into the terminal fitting groove 25.

Next, the insulating fixing tool 20 is fixed to the coil 10 by winding the insulating tape 17 through the notch 26. Then,
The end of the winding drawn from the bottom of the coil 10 is the crimp terminal 14
Along with it, it is held diagonally upward by the insulating fixture 20.

In the above description, the material of the insulation fixture 20 is PBT, P
Although it is assumed that the synthetic resin is PS, linenite, or the like, the present invention is not limited to this, and other synthetic resins may be used.

Effect of the Invention In the present invention, the crimp connection portion of the crimp terminal is fitted and fixed in the terminal fitting groove, so that the mechanical strength of the winding end can be maintained and the coil is firmly fixed to the coil. Further, it is possible to eliminate the drawback that the winding end portion is curved or deformed when the crimp terminal at the winding end portion is inserted into the connector of the external device.

[Brief description of drawings]

FIG. 1 (A) is an external perspective view showing a winding end insulation fixture of a small transformer according to the present invention, and FIG. 1 (B) is an external perspective view showing a state in which the insulation fixture is attached to a coil. FIG. 2 is a perspective view showing a terminal treatment of a winding end portion in the conventional technique. 10 …… Coil 14 …… Crimping terminal 17 …… Insulation tape 20 …… Insulation fixture 21 …… L-shaped part 22 …… Convex part 23 …… Fixing groove 24 …… Opening 25 …… Terminal fitting groove 26 ...... Notch

Claims (1)

[Scope of utility model registration request] 1. An L-shaped portion that abuts an outer surface of a coil,
A pair of protrusions formed in the vicinity of both ends of the outer vertical surface of the L-shaped portion, and in order to hold the winding end drawn out from the lower side of the coil in an obliquely upward direction,
A fixing groove is formed on the outer surface of the convex portion in a direction obliquely upward with respect to the outer vertical surface, and the fixing groove has an L-shaped groove cross section, and the outer surface of the convex portion is formed. An opening formed in the depth direction of the wire into which the winding end is inserted, and a base end of a crimp terminal formed on the inner side of the opening and caulked to the winding end. A winding end insulating fixture for a small transformer, characterized in that the terminal fitting groove into which the portion is fitted is formed.