JPH0123929B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to rotary transformers, in particular to the installation of ferrite cores and terminals.

Structure of conventional example and its problems A conventional rotary transformer is shown in FIG. 1 as a partially sectional perspective view and FIG. 2 as a cross-sectional view, and as shown in FIG. The side ferrite core 1 is provided on an insulating rotating side terminal, and is fitted into a cylindrical recess 2a and fixed with adhesive, and furthermore, a rotating plate 4 connected to a rotating shaft 3 is attached to the rotating side terminal 2. Fixed. On the other hand, the fixed-side ferrite core 5 is fixed to the fixed-side terminal 6 and installed on a fixed base 7. Further, the rotating shaft 3 is supported by a bearing 8 provided on the inner circumference of the stationary ferrite core 5.

Winding grooves are provided on the inside of the rotating side ferrite core 1 and on the outside of the stationary side ferrite core 5, and a ring-shaped coil 9 is provided in the winding groove.
a, 9b, 10a, 10b, 11a, 11b, 1
2a and 12b are arranged to face each other, and the rotating side ferrite core 1 and the stationary side ferrite core 5 are arranged with a gap of several tens of microns in between.

The lead wires 13 of the coils 9a, 10a, 11a, 12a installed in the rotating ferrite core 1 are connected to the lead wire guide groove 14 formed in the axial direction on the inner peripheral surface of the rotating ferrite core 1 and the rotating terminal 2. The lead wire is led out along the formed lead wire guide groove 15, wrapped around a conductive terminal pin 16, and soldered.

Further, the lead wires 17 of the coils 9b, 10b, 11b, and 12b equipped on the fixed side ferrite core 5 are led out along the lead wire guide groove 18 formed in the axial direction on the outer peripheral surface of the fixed side ferrite core 5, and are guided to the fixed side terminal. Conductive terminal pin 1 provided at 6
It is fixed at 9.

With the above configuration, the rotation of the rotating shaft 3 is directly transmitted to the rotating ferrite core 1.

However, in the above configuration, since the positional relationship in the rotational direction of the rotating side ferrite core 1 and the rotating side terminal 2 is not determined, it is necessary to check that the respective lead wire guide grooves match when fixing with adhesive. It has the disadvantage of poor assembly workability.

OBJECTS OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and is intended to prevent misalignment of the positional relationship between the terminal and the ferrite core, and to improve assembly workability.

Structure of the Invention The present invention provides a cylindrical recess in a terminal into which a core is fitted, a protrusion that fits in a recess provided at the end of the core and aligns a lead wire guide groove provided in the core and the terminal in the axial direction. The terminal and ferrite core can be easily positioned by simply matching the protrusion of the terminal with the recess on the end of the core.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is a partially sectional perspective view of the assembled state of a terminal and a ferrite core of a rotary transformer according to an embodiment of the present invention, and FIG. 5 is a perspective view of the terminal. In the figure, 20 is a ring-shaped terminal made of an insulator, and a conductive terminal pin 21
a, 21b, 22a, 22b, 23a, 23b,
Projections 26a, 26 to which 24a, 24b are fixed
b, 26c, 26d are formed on the outer peripheral surface 25, and lead wire guide grooves 28a, 28 are formed on the end surface 27.
b, 28c, 28d, while the inner peripheral surface 29 has the lead wire guide grooves 28a, 28b, 28c,
Lead wire guide grooves 30a, 30 connected to 28d
b, 30c, and 30d are provided. Further, the other end surface 31 has a cylindrical recess 33 into which the rotation side ferrite core 32 is fitted, and this cylindrical recess 33 has lead wire guide grooves 34a and 34b formed in the axial direction on the inner peripheral surface of the ferrite core 32. , 34c, 34d
and the lead wire guide grooves 30a, 30 of the terminal 20.
A protrusion that fits into a recess 35 provided in the ferrite 32 is provided in the axial direction so as to connect the ferrite 32.b, 30c, and 30d.

Therefore, if the protrusion 36 of the terminal 20 and the recess 35 of the ferrite core 32 match, the lead wire guide grooves 30a, 30b, 30c,
30d and lead wire guide groove 3 of ferrite core 32
4a, 34b, 34c, and 34d automatically match.

In this example, there are four protrusions, eight terminal pins, and four lead wire guide grooves, and the lead wire guide groove is provided at the position of the protrusion, but the positional relationship between the protrusions and the lead wire guide groove and the terminal The number of pins and lead wire guide grooves may be arbitrary. Furthermore, the terminal pin may protrude in any direction as long as the lead wire can be wound around it.

Effects of the Invention As described above, the present invention automatically connects the terminal and the lead wire guide groove provided in the core by fitting the protrusion provided on the terminal into the recess provided in the core and fixing the core and the terminal. This allows for improved assembly work efficiency, and has great practical effects during mass production.

[Brief explanation of drawings]

FIG. 1 is a partially sectional perspective view of a conventional rotary transformer, FIG. 2 is a sectional view of FIG. 1, FIG. 3 is a perspective view of a conventional terminal, and FIG. 4 is a rotary transformer according to an embodiment of the present invention. FIG. 5 is a partially sectional perspective view of the assembled terminal and ferrite core, and FIG. 5 is a perspective view of the terminal in an embodiment of the present invention. 20...Terminal, 21a, 21b, 22a,
22b, 23a, 23b, 24a, 24b...Terminal pin, 25...Outer peripheral surface, 26a, 26b, 2
6c, 26d...protrusion, 28a, 28b, 28
c, 28d... Lead wire guide groove, 29... Inner peripheral surface, 3
0a, 30b, 30c, 30d... Lead wire guide groove, 32... Ferrite core, 33... Cylindrical recess,
34a, 34b, 34c, 34d...Lead wire guide groove, 35...Recess, 36...Protrusion.

Claims (1)

[Claims] 1 has a plurality of terminal pins parallel to the central axis, has a lead wire guide groove extending from the central axis toward the outer periphery on an end face perpendicular to the central axis, and has a lead wire guide groove parallel to the central axis and the A ring-shaped terminal made of an insulator has a lead wire guide groove connected to the lead wire guide groove on the end surface, and is fixed to a cylindrical recess formed on the inner circumference of the terminal, and has a winding groove and a wire winding groove on the inner circumference. A cylindrical core having a lead wire guide groove parallel to the central axis, and a winding groove of the core are equipped, and a lead wire is led out in the lead wire guide groove and electrically connected to the terminal pin. The cylindrical recess of the terminal is provided with a protrusion in the axial direction that fits into the recess provided at the end of the core and matches the lead wire guide groove provided in the core and the terminal. A rotary transformer.