JPH062586U - Transmission device between rotating body and fixed body - Google Patents

Abstract

(57) [Summary] [Structure] In a case where a spirally wound flat cable 3 is housed between a relatively rotatable inner case 1 and outer case 2, the flat cable 3 includes two insulating tapes 7. And a non-adhesive portion 7a of an insulating tape is provided in the longitudinal direction of both side edges. [Effect] Since the non-adhesive portions of the insulating tape are provided on both side edges of the flat cable so as to have flexibility, a transmission device that does not generate abnormal noise due to the collision between the flat cable and the case even when subjected to vibration Can be obtained. There is no increase in the number of parts and no increase in size of the device.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transmission device used for transmitting electric signals, optical signals, etc. between a rotating body and a fixed body.

[0002]

[Prior art]

 3 to 5 show an example of a conventional transmission device between a rotating body and a fixed body. In this transmission device, an inner case 1 and an outer case 2 coaxially arranged are relatively rotatably assembled, and a flat cable 3 wound in a space formed by the inner case 1 and the outer case 2 is wound. It has a structure in which the inner end side 3a of the flat cable 3 is attached to the inner case 1 and the outer end side 3b is attached to the outer case.

This device operates as follows. First, the state of FIG. 3 is a state in which the inner case 1 is rotated to the limit in the direction of arrow B while the outer case 2 is fixed, and almost all of the flat cable 3 is wound around the inner case 1. When the inner case 1 is reversed and rotated in the direction of arrow A from this state, the winding of the flat cable 3 loosens, the elastic diameter of the flat cable 3 expands, and the flat cable 3 moves to the inside of the outer case 2. To go. When the inner case 1 is rotated in the direction of arrow A to the limit, the result is as shown in FIG.

As described above, this transmission device rotates the inner case in the range from the state of FIG. 3 to the state of FIG. 4 and from the state of FIG. 4 to the state of FIG. It is possible.

Next, FIG. 6 shows another example of a conventional transmission device between a rotating body and a fixed body. In this transmission device, a winding direction reversing part 4 is provided in the middle of a spirally wound flat cable 3 housed between an inner case 1 and an outer case 2, and the other configuration is the same as the above device. Is.

In this device, when the inner case 1 is rotated in the direction of arrow A, the flat cable 3 is wound around the inner case 1, the winding direction reversing portion 4 moves in the direction of arrow B, and conversely, the inner case 1 is rotated. When is rotated in the direction of arrow C, the flat cable 3 is fed from the inner case 1, and the flat cable 3 passes through the winding direction reversing portion 4 while the winding direction reversing portion 4 moves in the direction of arrow D. It gets caught inside 2. This type of transmission device has the advantage that the length of the flat cable required to obtain the same relative rotation speed can be shortened compared to a flat cable wound in one direction with a spiral wound.

The above is the case where the inner case is rotated, but it is also possible to fix the inner case and rotate the outer case. Although this type of transmission device has a restriction on the rotatable range, it has an advantage that a highly reliable transmission line can be configured because there is no sliding contact portion between the rotating body and the fixed body.

[0008]

[Problems to be solved by the device]

 In this type of transmission device, the flat cable is movable inside the case, so if it is subjected to vibration, the spiral wound flat cable and the case may collide with each other, causing abnormal noise. is there. This type of transmission device is often used for transmitting and receiving signals between the steering wheel side and the vehicle body side by attaching it to the steering shaft of an automobile. There is a problem of giving a feeling.

Therefore, conventionally, as shown in FIG. 5, discs 5 and 6 are respectively provided between the spirally wound flat cable 3 and the flange portion of the inner case 1 and between the flange portion of the outer case 2. Although it intervenes to absorb the vibration noise, this structure has a problem that the number of parts and the number of assembling steps increase.

In addition, it is also considered that the insulator of the flat cable is made of a vibration-proof non-woven fabric, or that the outer peripheral surface of the flat cable is provided with a vibration-proof layer made of plastic foam or the like. There is a problem that the electrical insulation performance is deteriorated and durability against repeated bending is decreased, and the latter has a problem that the flat cable becomes thick and the transmission device becomes large.

[0011]

[Means for Solving the Problems]

 The present invention provides a transmission device between a rotating body and a fixed body, which solves the above-mentioned problems, and has a configuration in which an inner case and an outer case coaxially arranged are relatively rotatably combined. The flat spirally wound cable is stored in the space formed by the inner case and outer case, and the inner end side of the flat cable is attached to the inner case and the outer end side is attached to the outer case. In a transmission device between a rotating body and a fixed body, one of which is used as a rotating body and the other as a fixed body, in which the conductor is sandwiched and bonded between two insulating tapes. In addition, it is characterized in that a non-adhesive portion of an insulating tape is provided in the longitudinal direction of both side edges.

[0012]

[Action]

 By doing so, relatively flat parts made of insulating tape alone are created on both edges of the flat cable, and these flexible parts come into contact with the flange part of the case, so that abnormal noise is generated even when subjected to vibration. Disappear.

[0013]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 show an embodiment of the present invention. This transmission device accommodates a flat spiral wound flat cable 3 in a space formed by an inner case 1 and an outer case 2 which are relatively rotatable, and the inner end side of the flat cable 3 is set to the inner case 1. Although the outer end side is attached to the outer case 2 as in the conventional case, the flat cable 3 is a flat cable as shown in FIG.

That is, the flat cable 3 is formed by sandwiching a plurality of tape-shaped conductors 8 between two insulating tapes 7 and adhering them with an adhesive 9. 7 is provided with a non-bonded portion 7a which is not bonded. When such a flat cable 3 is housed in a space formed by the inner case 1 and the outer case 2 as shown in FIG. 1, both side edges of the flat cable 3 are not bonded to the insulating tape 7a. Since the flexibility is imparted, the abnormal noise is not generated due to the collision with the cases 2 and 3 even when the vibration is received.

[0015]

[Effect of device]

 As described above, according to the present invention, since the non-adhesive portions of the insulating tape are provided on both side edges of the flat cable to give flexibility, even if the flat cable is vibrated, it may be different due to the collision between the flat cable and the case. There is an advantage that it is possible to obtain a transmission device that does not generate sound, and the number of parts does not increase and the device does not increase in size.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a transmission device between a rotating body and a fixed body according to an embodiment of the present invention.

FIG. 2 is a perspective view of a flat cable used in the device of FIG.

FIG. 3 is a cross-sectional view showing an example of a conventional transmission device between a rotating body and a fixed body.

FIG. 4 is a cross-sectional view showing a state in which the flat cable is rolled up in the apparatus of FIG.

5 is a longitudinal sectional view of the device of FIG.

FIG. 6 is a cross-sectional view showing another example of a conventional transmission device between a rotating body and a fixed body.

[Explanation of symbols]

 1: Inner case 2: Outer case 3: Flat cable 7: Insulating tape 7a: Non-adhesive part 8: Tape-shaped conductor 9: Adhesive

Claims (1)

[Scope of utility model registration request] 1. An inner case and an outer case coaxially arranged are relatively rotatably combined, and a spiral wound flat cable is housed in a space formed by the inner case and the outer case. In the transmission device between the rotating body and the stationary body, the end side is attached to the inner case, and the outer end side is attached to the outer case, and one of the inner case and the outer case is a rotating body, and the other is used as a stationary body. A rotating body and a fixed body, characterized in that the flat cable is formed by adhering a conductor between two insulating tapes and adhering the non-adhesive portions of the insulating tapes in the longitudinal direction of both side edges. Transmission equipment between.