JPS5919441A - Transmitter between rotating body and fixed body - Google Patents

Abstract

PURPOSE:To decrease the cost, by decreasing an outer diameter of a rotating side antenna so as to make the entire device small in size and to simplify the constitution. CONSTITUTION:A lower winding member 14 made of a non-inductive body is formed on an outer circumference of a rotating shaft 1 of the rotating side antenna 4, plural layers of antenna wires 15 made of a covered twist wire are wound overlappingly on the outer circumference and an upper winding member 16 made of a non-inductive body is formed on the outer circumference, further for the protection of the antenna wires. Both ends of the antenna wire 15 are led out between the lower winding member 14 and the upper winding member 16 and connected to a transmitter 3. A fixed side antenna 5 is arranged close to the surrounding of the rotating side antenna 4 and supported by cleats 12 arranged circumferentially in a prescribed pitch. This device is used when a signal or power is transmitted contactlessly by using the rotating side antenna and the fixed side antenna, in case of monitoring the state of a rotating body, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transmission device between a rotating body and a fixed body, and particularly to one that transmits signals and power in a non-contact manner using a rotating antenna and a fixed antenna.

There are various situations in which there is a need to exchange signals and power between a rotating body and a fixed body in a non-contact manner, such as when monitoring the state of a rotating body. Examples thereof are shown in FIGS. 1 and 2. This is a device that measures the torque applied to a rotating shaft, that is, the shaft torque.

A strain gauge 2 is attached to the rotating side R8, that is, the rotating shaft 1, to detect the distortion of the rotating shaft corresponding to the shaft torque, and the output of this strain gauge 2 is Ii'M modulated and transmitted to the fixed side 8S. A transmitter 3 is attached. Further, a rotating side antenna 4 is attached around the rotating shaft 1, and this rotating side antenna 4 is connected to the transmitter 3. - A fixed antenna 5 is provided on the fixed side 88 and is arranged concentrically with the rotating antenna 4, and the fixed antenna 5 is connected to the main body 6 of the measuring instrument.

Power for detecting changes in the strain gauge 2 and operating the transmitter 3 is supplied to the transmitter 3 from the measuring instrument body 6 via the fixed antenna 5 and the rotating antenna 4 in a non-contact manner. Ru. In addition, the output of the strain gauge 2 is converted into an FM signal by a transmitter 3, and sent to the measuring instrument main body 6 via a rotating antenna 4, a fixed antenna 5, or a separately provided FM antenna. It is converted into a shaft torque value in the device body 6.

The mounting structure of the rotating side antenna and fixed side antenna in such a device is as shown in Figs. 3 to 5. That is, the rotating side antenna 4 has an antenna wire 8 housed in an annular support 7 made of a non-inductive material (non-conductive non-magnetic material) such as PRP, and the annular support 70 is It is attached to the rotating shaft 1 by fixing it to a 7 flange 9 protruding from the outer periphery of the rotating shaft 1 using a pin 10. As shown in FIG. 4, the annular support 7 has a rectangular cross section that is long in the radial direction, and its inner circumferential side is 75>i)
The attachment part to 9 and the outer circumferential side are the storage part for antenna @8. In other words, the antenna wire 8 is connected to the
It is arranged at an appropriate distance G from the outer circumferential surface of the lunge 9.

Conventionally, this interval G is 50 degrees of culm. A notch is provided in a part of the annular support 7 in the direction of one row, and the transmitter 3 is fixed to the 7 flange 9 and installed at a position corresponding to the notch. The antenna wire 8 is in the form of a coil of more than ten turns, which is made by connecting more than ten coated stranded wires housed in the annular support 7 so as to be continuous at the notch.
Both ends thereof are connected to a transmitter 3. Further, the antenna wire 8 exposed in the notch is supported by a cleat 11.

On the other hand, the fixed side antenna 5 is arranged close to the periphery of the rotating side antenna 4, and is attached to the mounting base 13 by cleats 12 provided at precise intervals in the circumferential direction.

In the conventional transmission device between a rotating body and a fixed body as described above, seven flange is provided protrudingly on the rotating shaft, an annular support body having a larger outer diameter is attached to the seven langes, and the seven langes are installed in the annular support body. Since the antenna wire is accommodated with a larger diameter, the outer diameter of the rotating side antenna is considerably larger than that of the rotating shaft, which has the drawback of increasing the size of the entire device. In addition, the annular support not only positions the antenna wire outside of the 7th lunge, but also has the function of holding the antenna wire so that excessive tension is not applied to the antenna wire due to inertial force due to centrifugal force or shock torque. The larger the outer diameter, the stronger the need for it, and manufacturing it as a molded object such as FRP is extremely troublesome and has the disadvantage of being expensive.

It is an object of the present invention to eliminate the disadvantages of the conventional technology, to reduce the outer diameter of the rotating side antenna, to thereby reduce the size of the entire device, and to facilitate the manufacture of the rotating side antenna.
An object of the present invention is to provide a low-cost rotating body-fixed body transmission device.

In order to achieve this object, the present invention provides a rotating body-fixed body transmission device equipped with a rotating side antenna and a fixed side antenna, in which the 1161 rotating side antenna is wrapped around the outer surface of the rotating shaft. The present invention is characterized in that it is composed of a dielectric lower winding member, an antenna wire wound a required number of times around the outer periphery of the lower winding member, and a non-inductive upper winding member which is wound and fixed around the outer periphery of the antenna wire.

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 6 to 8. In FIGS. 6 to 8, the same or equivalent parts as in FIGS. 3 to 5 are given the same reference numerals.

In this embodiment, the rotating side antenna 4 is formed by winding glass fiber woven tape or the like to an appropriate thickness around the outer periphery of the rotating shaft 1 while applying varnish to form a lower winding member 14 made of a non-inductive material. The antenna wire 15 made of coated twisted m or the like is wound around the outer periphery of the lower winding member 14 in multiple layers by aligned winding for the required number of turns, and then a glass fiber woven tape or the like is varnished around the outer periphery for antenna wire insurance. The upper-rolling member 1 made of a non-inductive material is rolled to an appropriate thickness while being coated with
6.

The lower winding member 14 is bonded to the rotating shaft 1 with impregnated varnish, and the upper winding member 16 is attached to the wound antenna wire 1.
5 is bonded to the lower winding member 14 on both sides. antenna wire 1
Both ends of the transmitter 50 are led out from between the lower winding member 14 and the upper winding member 16 and connected to the transmitter 3, as shown in FIG.

The thickness of the lower winding member 14 may be equivalent to the distance q from the outer peripheral surface of the conventional 7-lunge to the antenna wire, but experiments have shown that even if the thickness of the lower winding member 14 is approximately the same as spraying, It has been found that if the number of windings of the antenna wire is increased by 20 to 30 times, the performance will be equivalent to that of the conventional antenna. Further, the thickness of the upper winding member 16 is also approximately several square meters.

1 of the fixed side antenna 5, cleat 12 and mounting base 13
#It configuration is the same as the conventional one.

With the above configuration, the rotation radius r of the rotating antenna 4 is much smaller than that of the conventional antenna, so that the inertial force due to the centrifugal force and shock torque applied to the antenna wire 15 can be significantly reduced.

Note that the centrifugal force applied to the antenna wire is proportional to the radius of rotation,
Inertial force is proportional to the square of the radius of rotation. As a result, there is an advantage that the thickness of the upper winding member 16 that restrains the antenna wire 15 from the outside can be reduced. Further, if the outer diameter of the rotating antenna 4 is reduced, the diameter of the fixed antenna 5 can also be reduced, which has the advantage that the mounting base 13 can also be made smaller. Furthermore, the rotating side antenna 4 does not require an FRP molded body such as a conventional annular support, and can be manufactured by winding it around the rotating shaft 1. Therefore, it is easy to manufacture and has the advantage of being able to reduce costs.

In the above embodiment, a rotating body-fixed body transmission device used in a shaft torque measuring device has been described, but the present invention is not limited to this, and can be applied to various types of devices that transmit and receive signals and power between a rotating body and a fixed body. It can be applied to the following devices.

As explained above, according to the present invention, the single rotary side antenna is constructed by winding the lower winding member around the rotating shaft, winding the antenna wire thereon, and winding the upper winding member thereon. This has the advantage that the outer diameter of the side antenna can be made smaller, so that the entire device can be made smaller, and that the rotating side antenna can be easily manufactured and costs can be reduced.

[Brief explanation of drawings]

Figure 1 is a principle diagram of the FM type shaft torque measurement equipment, Figure 2 is a circuit diagram of the device, Figure 3 is a front view of a conventional rotating body-fixed body transmission device, and Figure 4 is a diagram of tiI43. ■-y line sectional view,
Fig. 5 is a sectional view taken along the line V-V in Fig. 3, and Fig. 6 is a front view of a rotating body-fixed body transmission device according to an embodiment of the present invention, fs
Figure 7 is a sectional view taken along the ■-■ line in Figure 6, and Figure 8 is a cross-sectional view taken along the ■-■ line in Figure 6.
01... which is a cross-sectional view along the -■ line, rotation axis, 4...
...Rotating side antenna, 5...Fixed side antenna, 14...Non-inductive lower winding member, 15...
- Antenna wire, 16...Non-inductive upper winding member. -20゜Figure 1 Figure 2

Claims (1)

[Scope of Claims] ■. Comprising a rotating side antenna mounted around the rotating shaft and a fixed side antenna arranged concentrically with the rotating side antenna, and connected to the rotating body via these two antennas. In an apparatus that transmits signals or power between bodies, the rotary side antenna includes a non-inductive upper winding member that is wound and fixed to the outer peripheral surface of the rotary shaft, and a non-inductive upper winding member that is wound a required number of times around the outer cylinder of this lower winding member. 1. A rotating body-stationary body transmission device comprising: an antenna wire; and a non-inductive upper winding member wound and fixed around the outer periphery of the antenna wire. 2. In claim 1, the lower winding member is fixed to the rotating shaft by adhesive, and the upper winding member is fixed to the lower winding part H on both sides of the antenna wire by adhesive. Transmission device between rotating body and fixed body.