JPH0566889U - Transmission device between rotating body and fixed body - Google Patents

Abstract

(57) [Summary] [Structure] In a transmission device between a rotating body and a fixed body in which a winding direction reversing portion 11a is provided in an intermediate portion of a flat cable 11,
The inner end of the flat cable 11 wound around the body 13a and the flat cable 11 wound inside the tube portion 15a
The elastic endless belt 21 elastically deformed in an arc shape is arranged between the outer end side and the outer end side. [Effect] The elastic endless belt can prevent troubles due to the slack of the flat cable, so the flat cable is short and the operation is stable (or the number of possible rotations of the rotating body is large for the length of the flat cable). A transmission device is obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transmission device used for transmitting an electric signal, an optical signal, electric power or the like between a rotating body and a fixed body.

[0002]

[Prior Art]

 Conventionally, for example, when transmitting a signal between a steering shaft side (rotating body) and a column side (fixed body) of an automobile, a transmission device as shown in FIGS. 2 and 3 is used ( No. 62-168581 gazette).

This transmission device includes a flat cable 11 wound in a spiral shape, and an inner case 13 and an outer case 15 that accommodate the flat cable 11. The inner end of the flat cable 11 is fixed to the body portion 13a of the inner case 13, and is connected to one lead wire 17 there, and the outer end of the flat cable 11 is fixed to the tubular portion 15a of the outer case 15, There it is connected to the other lead 19. The inner case 13 and the outer case 15 are combined so as to be relatively rotatable.

Accordingly, for example, if the inner case 13 is attached to the rotating body and the outer case 15 is attached to the fixed body, the rotating body and the fixed body are fixed within a range in which the spirally wound flat cable 11 can be tightened and unrolled. Signal can be transmitted between them. This type of transmission device has limited applications when the rotating body reciprocates, but since it does not have a sliding contact part, it can form a highly reliable transmission line. Such a transmission device is used, for example, to transmit an electric signal from the vehicle body side of an automobile to an airbag system installed on a steering shaft that is a rotating body.

[0005]

[Problems to be solved by the device]

 In such a transmission device, the number of times the inner case and the outer case can rotate relative to each other is determined by the number of windings of the flat cable. Have to be long). However, if the number of turns of the flat cable is increased, it becomes difficult for the rotating force on the rotating body side to be transmitted to the entire flat cable, so that problems such as inversion bending of the flat cable are likely to occur. Moreover, if the length of the flat cable becomes long, there are problems that the electric resistance of the conductor becomes large and that the signal transmission time becomes long.

Therefore, a transmission device as shown in FIG. 4 has been proposed as a device that can reduce the number of turns of the flat cable. In this transmission device, the inner end of the flat cable 11 is fixed to the body portion 13a of the inner case 13, the outer end of the flat cable 11 is fixed to the tubular portion 15a of the outer case 15, and the inner end side of the flat cable 11 is fixed. The flat cable 11 is wound around the body portion 13a in one direction, and the outer end side of the flat cable 11 is wound inside the tubular portion 15a so that the winding direction is opposite to that of the inner end side. The direction reversing portion 11a is provided.

In this apparatus, for example, when the outer case 15 is fixed and the inner case 13 is rotated counterclockwise, the reversing portion 11a of the flat cable 11 also moves counterclockwise, and both cases 13, Since the relative rotation between 15 is canceled out, the number of windings of the flat cable 11 can be reduced (the length can be shortened).

However, contrary to the above, in this device, when the inner case 13 is rotated clockwise, the flat cable 11 wound around the inner case 13 is slackened, and the reversing portion 11a is rotated clockwise. Since the state of not moving tends to occur, there is a problem that normal rotation operation cannot be performed as a result. For this reason, the actual situation is that this type of transmission device has not been put to practical use.

In view of the above problems, an object of the present invention is to provide a transmission device capable of reliably preventing a trouble due to a slack of a flat cable by providing a winding direction reversal portion in an intermediate portion of the flat cable. To provide.

[0010]

[Means for Solving the Problems]

 To achieve this object, the present invention comprises an inner case having a body portion and an outer case having a cylindrical portion located on the outer periphery of the body portion, which are combined so as to be relatively rotatable, and a flat cable is attached to the body portion. The inner end of the flat cable and the outer end of the flat cable to the tube, and wrap the inner end of the flat cable around the body in one direction, and the outer end of the flat cable to the inner end. In the transmission device between the rotating body and the fixed body, which is wound in the inside of the tubular part so that the winding direction is opposite to that of the The elastic end elastically deformed in an arc shape so that two U-turn parts are formed between the inner end side of the flat cable and the outer end side of the flat cable wound inside the tubular part. The Svelte, characterized in that the winding direction reversal section of the flat cable is arranged so as to be located between the two U-turn portion.

[0011]

[Action]

 In this case, the elastic endless belt presses the inner end side of the flat cable against the body part and the outer end side against the tube part, so that the slack of the flat cable is suppressed, and the inner case or the outer case is rotated to rotate the flat cable. Winding direction Reversing part moves securely. Moreover, the elastic endless belt moves together with the winding direction reversal part of the flat cable like a caterpillar by the rotation of the inner case or the outer case. Therefore, it is possible to eliminate the trouble caused by the slack of the flat cable.

[0012]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. Also in this transmission device, the inner end of the flat cable 11 is fixed to the body portion 13a of the inner case 13, the outer end of the flat cable 11 is fixed to the tube portion 15a of the outer case 15, and the inner end of the flat cable 11 is fixed. One side of the flat cable 11 is wound around the body portion 13a, and the outer end side of the flat cable 11 is wound inside the tube portion 15a so that the winding direction is opposite to that of the inner end side. This is the same as the conventional one in that the direction reversing portion 11a is provided.

The characteristic of this transmission device is that the elastic endless is provided between the inner end side of the flat cable 11 wound around the body portion 13a and the outer end side of the flat cable 11 wound inside the tubular portion 15a. That is, the belt 21 is arranged. The elastic endless belt 21 is made of a material having a good spring property such as a phosphor bronze strip, and is elastically deformed in an arc shape so as to have two U-turn portions 21a and 21b as shown in the drawing. The elastic endless belt 21 is arranged so that the winding direction reversing portion 11a of the flat cable 11 is located between the two U-turn portions 21a and 21b.

As a result, the inner end side of the flat cable 11 is pressed against the body portion 13a by the elastic endless belt 21, and the outer end side of the flat cable 11 is pressed against the cylindrical portion 15a by the elastic endless belt 21.

Next, the operation of this device will be described. Here, the case where the outer case 15 is fixed and the inner case 13 reciprocally rotates will be described. First, when the inner case 13 is rotated counterclockwise in FIG. 1, the flat cable 11 is wound around the body portion 13a, so that the inverting portion 11a of the flat cable moves clockwise (from the inside of the tubular portion 15a to the flat portion). Cable 11 will be unwound). Along with this, the elastic endless belt 21 also rotates counterclockwise. Conventionally, there was no particular problem with the rotation in this direction.

Next, when the inner case 13 is rotated clockwise in FIG. 1, the flat cable 11 is sent out from the body portion 13 a, but the flat cable 11 wound around the body portion 13 a is elastic endless belt 21. Since it is pressed against the body portion 13a, slack does not occur, and after all, it is sent out to the outer peripheral side through between the U-turn portions 21a and 21b of the elastic endless belt 21, so the winding direction of the flat cable 11 The reaction part 11a also moves smoothly in the clockwise direction. Further, along with this, the elastic endless belt 21 also rotates clockwise.

Therefore, the inner case 13 can be rotated back and forth without causing slack in the flat cable 11, and troubles due to the slack of the flat cable can be eliminated.

In the above embodiment, the case where the inner case 13 is a rotating body and the outer case 15 is a fixed body has been described, but the transmission device of the present invention, on the contrary, fixes the inner case 13 to a fixed body. It is also possible to use it as a body and use the outer case 15 as a rotating body. In order to prevent the slack of the flat cable more reliably, at least one surface of the flat cable and the elastic endless belt has a rubber layer, a low-adhesive pressure-sensitive adhesive layer or a roughening layer such as a slip resistance increasing layer. Should be provided.

[0019]

[Effect of the device]

 As described above, according to the present invention, it is possible to reliably prevent troubles due to the slack of the flat cable in a transmission device having a winding direction reversal part in the middle part of the flat cable. It is possible to obtain a transmission device that has stable operation (or has a large number of rotations of the rotating body for the length of the flat cable).

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a transmission device according to the present invention.

FIG. 2 is a cross-sectional view of a conventional transmission device.

FIG. 3 is a vertical cross-sectional view of the transmission device of FIG.

FIG. 4 is a cross-sectional view of a transmission device of a system having a winding direction reversal portion in an intermediate portion of a flat cable.

[Explanation of symbols]

11: Flat cable 11a: Winding direction reversal part 13: Inner case 13a: Body part 15: Outer case 15a: Cylindrical part 21: Elastic endless belts 21a, 21
b: U-turn section

Claims (1)

[Scope of utility model registration request] 1. An inner case having a body and an outer case having a cylinder located on the outer periphery of the body are combined so as to be rotatable relative to each other, and an inner end of a flat cable is fixed to the body. Along with fixing the outer end of the flat cable to the tubular part, and winding the inner end side of the flat cable around the body part in one direction, the outer end side of the flat cable has a winding direction opposite to the inner end side. Thus, in the transmission device between the rotating body and the fixed body, which is wound inside the tubular portion, whereby the winding direction reversing portion is provided in the middle portion of the flat cable, the inner end side of the flat cable wound around the body portion And an outer end side of the flat cable wound inside the tubular portion, an elastic endless belt elastically deformed in an arc shape so that two U-turn portions are formed. Rotating body and transmission device between a fixed body, characterized in that the winding direction reversal section of the flat cable is arranged so as to be positioned between the over down portion.