JPH056244B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to rotating equipment assemblies such as disk motors and VTRs (video tape recorders) that require high-speed and highly accurate transmission of rotation.

[Prior Art] Generally, there are various types of rotating equipment of this type, and the following will explain the rotating head assembly of a VTR as an example.

In magnetic recording and reproducing equipment such as VTRs, multichannel rotary transformers are used to transmit signals between multiple rotating magnetic heads and signal circuits.

Figure 1 shows the structure of a typical VTR rotary head assembly. However, illustration of the drive motor is omitted. In the figure, 1 is a top drum fixed to the flange 3, 2 is a rotating shaft to which the flange 3 is fixed by press fit or shrink fit, 4 is a rotating head, 5 is a lower drum, and 6 is a rotary side rotary fixed to the flange 3 with adhesive. Transformer 7 is a fixed side rotary transformer adhesively fixed to the lower drum 5.
8 is an upper bearing provided at the upper part of the lower drum 5;
9 is a lower bearing provided at the lower part of the lower drum 5;
10 is an end ring inserted through the lower end of the rotating shaft 2; 11 is a set screw for tightening and fixing the end ring 10 to the rotating shaft 2; and 12 is a shim interposed between the flange 3 and the upper bearing 8. be.

Next, a conventional method of assembling a rotary transformer in a rotary head assembly having the above structure will be explained.

FIG. 2 is an assembly diagram of the fixed side rotary transformer 7. The fixed side rotary transformer 7 is attached to the lower drum 5.
After adhering and solidifying, measure the height h1 from the top surface of the rotary transformer 7 to the point corresponding to the bearing contact surface of the flange 3. FIG. 3 is an assembly diagram of the rotating side rotary transformer 6. After the rotating side rotary transformer 6 is adhesively solidified to the flange 3 fixed to the rotating shaft 2, the bearing contact surface of the flange 3 is inserted from the bottom surface of the rotary transformer 6. Height to the corresponding point
Measure h2. Thereafter, the shim 12 is inserted between the upper bearing 8 and the flange 3 of the lower drum 5 so that the gap g between the fixed side and rotating side rotary transformers 6 and 7 is maintained constant.
The assembly of the rotary transformer section is completed by inserting the end ring 10 from below, applying an appropriate preload, and tightening the set screw 11 to fix the end ring 10 to the rotating shaft 2.

Next, the operation will be explained. For example, as shown in FIG. 4, the magnetic flux generated by the current flowing through the rotating coils 13a and 13b in the rotating rotary transformer 6 is generated by the fixed coils 14a and 13b in the fixed rotary transformer 7, respectively. 14b
Magnetic paths 15a and 15b surrounding the fixed coils 14a and 14b are formed to induce voltage in the fixed coils 14a and 14b, thereby transmitting signals.

Generally, the transmission efficiency of a rotary transformer is expressed by a coupling coefficient K expressed by the following equation.

K=√1− However, Lo: Leakage inductance Lp: Combined inductance By the way, the combined inductance Lp is inversely proportional to the gap g between the rotary transformers 6 and 7 on the rotating side and the stationary side. Therefore, in order to increase transmission efficiency, it is necessary to reduce the gap g.

However, in assembling a conventional rotary transformer, the height h1 shown in FIG. It can take values with variations. Further, the height h2 shown in FIG. 3 can also vary considerably, similar to h1. In order to maintain the gap g constant in such a state, it is necessary to prepare a large number of shims 12 of different thicknesses. Furthermore, it is difficult to suppress variations in gap g to below the minimum shim thickness.

Furthermore, the perpendicularity of the mounting surfaces of the fixed side and rotating side rotary transformers 6, 7 from the reference center axis;
Due to variations in the parallelism of the upper and lower surfaces of the fixed and rotating rotary transformers 6 and 7, adhesive thickness, etc., the upper surface of the fixed rotary transformer 7 (gap forming surface side) and the lower surface of the rotating rotary transformer 6 (gap forming surface) (sides) are each mounted at an angle with respect to the reference center axis. This means that the gap g will vary relatively and may also cause contact between the two rotary transformers 6 and 7, so the gap g must be set large and the minimum shim thickness. In addition, it had the disadvantage of deteriorating the transmission efficiency of the rotary transformer.

[Summary of the Invention] This invention was made to eliminate the above-mentioned conventional drawbacks, and the rotating body and the fixed body are respectively
By adhesively fixing the flexible member to the rotating support and fixed support via a flexible member impregnated with adhesive in advance, a rotating device with a constant gap and no relative tilt can be realized, which improves transmission efficiency. The present invention also aims to provide a rotating equipment assembly that can improve work efficiency by eliminating shims and the like.

[Embodiments of the Invention] Examples of the invention will be described below with reference to the drawings.

FIG. 5 shows an example of the rotating side rotary transformer 6 according to the present invention, and on the non-gap forming surface side,
Rotating side flexible member 16 impregnated with adhesive in advance
is attached. FIG. 6 shows a fixed-side rotary transformer 7, and a fixed-side flexible member 17 impregnated with an adhesive in advance is attached to the non-gap forming surface thereof.

FIG. 7 shows that the fixed rotary transformer 7 shown in FIG. 6 is temporarily placed on the lower drum 5, held at a specified height and perpendicular to the central axis, and then fixed to the fixed flexible member 17. , fixed side rotary transformer 7 via pre-impregnated adhesive.
It shows a state in which it is adhesively fixed to the lower drum 5.

FIG. 8 shows that the rotary transformer 6 on the rotating side shown in FIG. A state in which the rotating side rotary transformer 6 is adhesively fixed to the flange 3 via an adhesive that is pre-impregnated into the side flexible member 16 is shown.

Next, the bearings 8 and 9 of the lower drum 5 to which the fixed side rotary transformer 7 shown in FIG.
Insert the rotating shaft 2 of the flange 3 to which the rotary transformer 6 shown in FIG. 8 is attached from one direction, insert the end ring 10 below the rotating shaft 2 with an appropriate preload applied, and Set screw 11
The end ring 10 is fixed to the rotating shaft 2 by.
This completes the assembly of the rotary transformer section.
This state is shown in FIG.

As described above, by using the flexible members 16 and 17 impregnated with adhesive in advance, variations in the dimensions of each component or part are absorbed by the flexible members 16 and 17, so that the gap is maintained at a specified value. In addition, since the gap forming surfaces of the stationary side and rotating side rotary transformers 6, 7 can be held perpendicular to the central axis and fixed by adhesive, the gap can be extremely small and the gap fluctuation can be minimized. Therefore, the transmission efficiency of the rotary transformer can be improved, and fluctuations in transmission characteristics can also be suppressed. Furthermore, variations in the performance of the rotary transformer between the rotary head assemblies can be suppressed to a small level. Furthermore, the gap adjustment shim can be eliminated, and the height in Figures 2 and 3 can be
Measurement of h1 and h2 can also be omitted, leading to cost reduction.

The present invention can be applied not only to the rotary transformer section of a rotating head assembly, but also to a rotating equipment assembly in which a rotor rotates with a small gap between it and a stator, such as a flat disk motor. play.

[Effects of the Invention] As described above, according to the present invention, when adhesively fixing a rotating body and a fixed body to a rotating support body and a fixed support body, a flexible member impregnated with an adhesive in advance is used. Since they are interposed and fixed with adhesive, variations in the dimensions of each component and each part can be easily absorbed by the flexible member, and the gap forming surface between the rotating body and the fixed body is held at right angles to the reference central axis. Moreover, it can be adhesively fixed with an extremely small gap. This makes it possible to significantly improve the performance of rotating equipment, such as improving the transmission efficiency of rotary transformers in magnetic recording and reproducing devices. Moreover, it is possible to eliminate the use of conventional shims, etc., and it is possible to improve assembly work efficiency, which has the effect of reducing the overall cost of the rotating equipment, including assembly costs.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the structure of the rotating head assembly, Figure 2 is an assembled diagram of a conventional fixed-side rotary transformer, Figure 3 is an assembled diagram of a conventional rotary-side rotary transformer, and Figure 4 is an operation of the rotary transformer. 5 is a structural diagram of a rotating side rotary transformer which is an embodiment of the present invention, FIG. 6 is a structural diagram of a fixed side rotary transformer which is an embodiment of this invention, and FIG. 7 is a structural diagram of a fixed side rotary transformer which is an embodiment of the present invention. FIG. 8 is a diagram showing a state in which the transformer is adhesively fixed to the lower drum, FIG. 8 is a diagram showing a state in which the rotating side rotary transformer is adhesively fixed to the flange, and FIG. 9 is a diagram showing a state in which the assembly of the rotary transformer is completed. 2...Rotating shaft, 3...Flange (rotating support), 5
... Lower drum (fixed support), 6... Rotating side rotary transformer (rotating body), 7... Fixed side rotary transformer (fixed body), 8... Upper bearing, 9... Lower bearing,
16, 17...Flexible member, g...Gap. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A rotating body fixed to a rotating support that includes a rotating shaft in a rotating device, and a fixed support that includes a pair of upper and lower bearings that rotatably support the rotating shaft. A rotating equipment assembly comprising a fixed body, and a rotating shaft on the rotating support side is inserted into a pair of bearings on the fixed support side from one direction to form a gap between the rotating body and the fixed body, The above-mentioned rotating body and stationary body are adhesively fixed to the rotating support body and fixed support body through flexible members pre-impregnated with adhesive, respectively, at specified heights and perpendicular to the central axis. A rotating equipment assembly characterized by: 2. The rotating equipment assembly according to claim 1, wherein the rotating equipment is a rotating head assembly of a magnetic recording/reproducing device, the rotating body is a rotating rotary transformer, and the fixed body is a stationary rotary transformer. 3. The rotating equipment assembly according to claim 1, wherein the rotating equipment is a flat disk motor, the rotating body is a rotor, and the fixed body is a stator.