JPS60198708A - Manufacture of coaxial type rotary transformer - Google Patents

Abstract

PURPOSE:To simplify a working process by inserting ring-shaped wire rods into grooves for each short ring formed among coils for several channel and mounting the short rings. CONSTITUTION:Ring-shaped wire rods 14 are machined circularly, and have overlapping sections 14a. The wire rods 14 are inserted into an internal core 20 under the state in which the diameters R of rings are increased by applying external force in the X-X direction. The wire rods 14 are transferred to the positions of grooves 12 for short rings, external force is removed, and the wire rods are inserted into the grooves 12. The overlapping section 14a sections in the wire rods 14 are brazed and fixed. Accordingly, a working process is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for manufacturing a coaxial rotary transformer used in magnetic recording/reproducing devices and the like.

[Technical background of the invention and its problems]

Conventionally, in the manufacturing method of coaxial type rotary transformer,
The short rings inserted between the coils for each channel to prevent crosstalk were fitted into the short ring grooves by the following work steps.

That is, a short ring groove 2 is provided between each channel coil (not shown) that is fitted into a plurality of coil grooves 1 formed on the outer peripheral surface of the cylindrical inner core 10 shown in FIG. are formed in each of the short ring grooves 2, and when inserting a short ring into each of the short ring grooves 2, as shown in Fig.
4 is wound around the outer peripheral surface of the inner core 10 and pushed into the short ring groove 2, and at the same time, as shown in FIG.
and then as shown in FIG.
Both ends of the wire 4 are cut leaving the twisted part 4a, the twisted part is soldered and electrically connected, and the fifth
As shown in the figure and FIG.
Both ends of the coil were bent so as to be pushed into grooves 3 for pulling them out, and finally, the twisted portions 4a in the pull-out grooves 3 were fixed with adhesive.

However, the conventional short ring fitting process described above not only requires a large number of man-hours;
This method involves the tedious process of winding a single wire, twisting it multiple times, cutting it, and soldering it, which has hindered the efficient production of coaxial rotary transformers.

[Purpose of the invention]

The present invention has been made based on the above circumstances, and a short ring for preventing cross stroke between the coils for each channel can be formed by a short ring groove formed on the outer peripheral surface of the inner core by a simple work process. The purpose of the present invention is to provide a method for manufacturing a coaxial rotary transformer that can be inserted into a coaxial type rotary transformer.

[Summary of the invention]

Summary of the present invention for achieving the above object includes a cylindrical inner core, a coil in which a coil is fitted into a plurality of coil grooves formed on the outer peripheral surface of the core, and a coil formed between the coil grooves. A manufacturing method for obtaining a rotary transformer comprising a first member comprising a short ring inserted into a short ring groove, and a second member disposed on the outer periphery of the first part with a predetermined gap maintained between the first member and the first member. In the manufacturing process of the first part, a short ring is prepared in advance into a circular shape corresponding to the diameter of the inner core, and the short ring is inserted into the short ring groove by applying an external force to the short ring. It is characterized in that it includes a step of wearing.

(Embodiments of the Invention) Examples of the present invention will be described below with reference to the drawings.

7 and 8 show an embodiment of the method for manufacturing a coaxial rotary transformer according to the present invention, and FIG. 7 is a perspective view showing the state before inserting the short ring,
FIG. 8 is an enlarged perspective view showing a state in which a short ring is inserted.

That is, in the embodiment of the present invention, each of the coil grooves 11 that are fitted into the plurality of coil grooves 11 formed on the outer peripheral surface of the cylindrical inner core (for example, rotor core or stator core) 20 shown in FIG. Channel coil (not shown)
When inserting a short ring into each of the short ring grooves 12 provided between them, use a ring that has been previously machined to have the same diameter as the short ring groove 12, as shown in FIG. The following work steps are carried out using a wire rod 14 having a shape of 14.

The ring-shaped wire 14 is a spring wire (for example, phosphor bronze, etc.) that has been previously processed into a circular shape, and both ends thereof have an overlapping M′+ 14 a that is doubled,
The diameter of the ring can be changed by external force. In this case, it is convenient to process the ring-shaped wire 14 so that its reference diameter R is slightly smaller than the diameter of the short ring groove 12.

This ring-shaped wire 14 is inserted into the short ring groove 12.
7, first insert the ring-shaped wire 14 into the inner core 20 while applying an external force in the X-X direction to increase the ring diameter R. When the external force is removed after the ring-shaped wire 14 is moved to the position of the short ring groove 12 provided on its outer circumferential surface, the ring-shaped wire 14 returns to its original diameter due to the restoring force, as shown in FIG. It is inserted into the short ring groove 12 as shown in FIG. At this time, the ring-shaped wire 14 has a ring diameter slightly smaller than the diameter of the inner circumference of the short ring groove 12.
It is designed to be firmly inserted into the 2. Finally, the overlapping portion 148 of the ring-shaped wire 14 inserted into the short ring groove 12 is electrically connected, for example, by brazing, and fixed with adhesive. Furthermore, the seventh
In the figures and FIG. 8, reference numeral 13 denotes a pull-out groove for pulling out both ends of the coil.

As described above, the rings 1 to 1 are installed by inserting the ring-shaped wire rods 14 into the short ring grooves 12 provided between the short ring coils.

The manufacturing method according to the above embodiment skillfully utilizes the spring restoring force of the wire material pre-formed into a ring shape to easily insert the short ring into the short ring groove by varying the diameter of the ring by adjusting the external force. I can wear it. In other words, the short ring can be inserted into the desired location by an extremely simple operation of pulling the ring-shaped wire rod 14 in the direction of the arrow XX shown in the figure and inserting it into the short ring groove 12, thereby reducing the manufacturing work. This will contribute to simplifying the process.

9 to 12 show other embodiments of the method for manufacturing a coaxial rotary transformer according to the present invention.

That is, in other embodiments of the present invention, as shown in FIGS. 9 to 12, the flexible A ring-shaped wire 24 is used to insert it into the show 1-ring groove 12. To explain in detail the work steps up to this insertion, first, the ring-shaped wire 24 is inserted into the inner core 20.
9, and move it to the position where the short ring groove 12 is located, as shown in FIG. Next, at the position of the short ring groove 12, a part of the ring-shaped wire 24 is pulled in the direction of arrow Y in the figure using a jig such as a pin to form a protrusion 24a on a part of the wire 24, and Push the ring-shaped wire 24 into the short ring groove 12 (
(See Figure 10). Furthermore, as shown in FIGS. 11 and 12, by bending the formed convex portion 24a so as to push it into the pull-out groove 13, the ring-shaped wire rod 24
into the show 1 to ring grooves 12. In this way, each show 1 provided between the coils for each channel
- Short rings are installed by inserting ring-shaped wire rods 24 into the ring grooves 12.

The manufacturing method according to the other embodiments described above is a simple process in which the ring-shaped wire 24 that has been moved to the positions of the show 1 to the ring groove 12 is partially pulled, and the convex portion 24a formed thereby is bent. Since the short ring can be firmly inserted into the desired location by operation, it can contribute to improving the efficiency of the manufacturing process. Incidentally, by twisting and bending the convex portion 24a of the ring-shaped wire 24 so as to push it into the pull-out groove 13, as shown in FIG.
Show 1 - The ring may be inserted at the desired location. Even in this case, since the twisting to be applied is as simple as twisting the convex portion 24a formed by stretching, the culm does not interfere with the efficiency of the manufacturing process.

It goes without saying that the present invention is not limited to the embodiments described above, and includes various modifications within the scope of the gist of the present invention.

〔Effect of the invention〕

As explained above, according to the present invention, the short ring for preventing cross-over between the coils for each channel can be easily inserted into the short ring groove by simplifying the work process. It is possible to provide a method for manufacturing a coaxial rotary transformer, which can contribute to improving the efficiency of manufacturing operations.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the inner core to explain the conventional insertion of a short ring, and Figs. 2 to 4 are diagrams showing the conventional work IN for inserting a single wire as a short ring. 1 is a sectional view taken along the line A-A in FIG. 1, FIG. 5 is an enlarged front view of the main part showing the final process, and FIG. 6 is a sectional view taken along the line B-B in FIG. 7 and 8 show an embodiment of the method for manufacturing the coaxial rotary 1 to lance according to the present invention,
FIG. 7 is a perspective view showing the state before the short ring is inserted, and FIG. 8 is an enlarged perspective view showing the state with the short ring inserted. 9 and 10 are cross-sectional views of one step of a manufacturing method showing another embodiment of the present invention,
Figure 11 is an enlarged front view of the main parts showing the final process, Figure 12
The drawings are a sectional view taken along the line C--C in FIG. 11, and FIG. 13 is an enlarged front view of essential parts showing the final step in a modification of the present invention. 11... Groove for coil, 12... Groove for short ring, 14.24... Ring-shaped wire (ring-shaped short ring), 24a... Convex portion. Agent Patent Attorney Tadashi Misawa Yoshitou 2

Claims (1)

[Scope of Claims] (1) A cylindrical inner core, a coil that fits into a plurality of coil grooves formed on the outer peripheral surface of this core,
a first member consisting of a short ring inserted into a short ring groove formed between the coil grooves;
In the manufacturing method for obtaining a rotary 1 Herance consisting of a second member disposed on the outer periphery of the first member while maintaining a predetermined gap with the other member, the manufacturing process of the first part includes forming a circular shape corresponding to the diameter of the inner corner 7 in advance. 1. A method for manufacturing a coaxial rotary mill lance, comprising the steps of: preparing a short ring machined into the short ring; and inserting the short ring into the short ring groove by applying an external force to the short ring. (2) The ring expands in diameter due to external force,
2. The method for manufacturing a coaxial rotary transformer according to claim 1, wherein the coaxial rotary transformer has a spring property that restores its diameter upon removal of an external force. (3) The short ring is made of a material that can form a convex portion by external force.
A method for manufacturing a coaxial rotary transformer as described in .