JP2001112156A - Rotary connector for mounting on car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary connector for use on a car which can drive an air bag inflator without fail, with the small electric resistance of a conductor connected to an air bag circuit. SOLUTION: A rotary connector for use on a car is constituted of housings 1 and 2 on fixed side and movable side, which are coupled rotarably with each other, first and second flexible cables 4 and 5, which are housed capable of winding are rewinding in a circular cable storage space 3 made between those housings in a pair, and a mover 6 which inverts the direction of winding of each flexible cables 4 and 5. A conductor 23a for an air bag circuit is borne with the first flexible cable 4 shorter in overall length than the second flexible cable 5. Doing it in this way will enable the electric resistance value of the conductor 23a for the air bag circuit to be made smaller than that, in the case of bearing the conductor 23a for the air bag circuit with the second flexible cable 5 longer in overall length, so that a large current can be supplied from a control circuit installed on the stator side to an air bag inflator installed on the side of a steering wheel. Thus, this connector can actuate the air bag inflator without fail.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-vehicle rotary connector mounted on a steering device of an automobile and used as an electrical connection means for an airbag system or the like, and more particularly, to a rotary connector for a plurality of cables in a cable storage space. The present invention relates to an in-vehicle rotary connector in which a flexible cable is housed and a winding direction of each flexible cable is reversed in a cable housing space.

[0002]

2. Description of the Related Art A vehicle-mounted rotary connector is incorporated in a steering device of an automobile and is used as an electrical connection means for an airbag circuit, a horn circuit, and other switch circuits mounted on a steering wheel. A pair of fixed-side (outer-peripheral-side) housings and movable-side (inner-peripheral-side) housings concentrically arranged and relatively rotatably connected, and an annular cable housing formed between the pair of housings And a flexible cable housed in the space so as to be able to be wound and unwound. In addition, the flexible cable carries a plurality of electrically independent conductors between two insulating base films, and is formed in a belt shape.

In recent years, the number of electric circuits mounted on a steering wheel has been increasing, and accordingly, the number of conductors carried on a flexible cable, that is, the increase in the number of circuits, has been increased in a rotating connector for a vehicle. And a reduction in external dimensions.

Conventionally, as this kind of rotary connector, as described in, for example, JP-A-8-55667, a plurality of flexible cables are accommodated in a cable accommodating space and a flexible connector is provided. A cable in which the winding direction of the cable is reversed halfway has been proposed. When a plurality of flexible cables are stored in the cable storage space, the number of conductors that can be carried by the flexible cable can be increased as compared with the case where only one flexible cable is stored. When the winding direction of the flexible cable is reversed halfway, the required length of the flexible cable can be reduced to about 1/2 compared with the case where the winding direction is not reversed. The number of turns of the cable can be reduced, and the outer dimensions of the rotary connector can be reduced.

FIG. 6 is a configuration diagram of a rotary connector described in the above-mentioned known example, wherein 101 is a fixed housing, 1
02 is a movable side housing, 103 is an annular cable storage space formed between the pair of housings 101 and 102, 104 is a movable body rotatably stored in the cable storage space 103, and 105 and 106 are the movable bodies. First and second rollers 107 and 108 rotatably attached to the moving body 104 are first and second openings for passing a flexible cable formed on the moving body 104;
109 and 110 are first and second flexible cables, 11
Reference numerals 1 and 112 denote connection connectors connected to both ends of the flexible cable. In the present specification, in order to facilitate comparison with the present invention, each member shown in FIG. 6 is given a name different from the name described in the above-mentioned known example.

The flexible cables 109 and 110 are double-wound with the first flexible cable 109 on the inner side and the second flexible cable 110 on the outer side. Is stored inside. In addition, each flexible cable 1
Connectors 11 connected to both ends of the connector 09, 110
Reference numerals 1 and 112 are fixed to the fixed housing 101 and the movable housing 102, respectively, and connected to an external circuit such as an airbag circuit. First flexible cable 109
Is wound in a U-shape around the first roller 105 through the first opening 107 during the winding, and the winding direction is 1
It is inverted by 80 degrees. On the other hand, the second flexible cable 110
Is wound around the second roller 106 in a U-shape through the second opening 108 during the winding, and the winding direction is 1
It is inverted by 80 degrees.

[0007] The rotary connector comprises a movable housing 1
When the cable 02 is rotated counterclockwise relative to the fixed housing 101, the flexible cables 109 and 110 are wound around the movable housing 102, and the inverted portions 109a and 110a of the flexible cables 109 and 110 are rotated. Are in close contact with the peripheral surfaces of the first and second rollers 105 and 106, and the first and second rollers are tensioned by the flexible cables 109 and 110.
The rollers 105 and 106 rotate clockwise and counterclockwise, respectively, and the moving body 104 itself rotates counterclockwise. Conversely, when the movable housing 102 is rotated clockwise relative to the fixed housing 101, the flexible cables 109 and 110 are unwound from the movable housing 102, and the flexible cables 109 and 11 are rotated.
0 inversion portions 109a and 110a are the first and second openings 1
07, 108, each flexible cable 10
The moving body 104 itself rotates clockwise by the pressing force of 9,110. Thereby, the movable housing 102
Can maintain the conduction of the flexible cables 109 and 110 during the rotation of.

[0008]

As described above, the on-vehicle rotary connector is incorporated in a steering device of an automobile and serves as an electrical connection means for an airbag circuit or a horn circuit mounted on a steering wheel. Of these circuits, the airbag circuit is required to have particularly high reliability for security. Therefore, when an acceleration (impact force) exceeding a predetermined value acts on the body of the automobile, the airbag circuit is provided on the stator side. In order to reliably transmit the signal from the control circuit to the airbag inflator provided on the steering wheel side, the conductor connected to the airbag circuit is required to have particularly low conductor resistance.

However, the rotary connector described in Japanese Patent Application Laid-Open No. 8-55667 has a reduced resistance of a conductor connected to the airbag circuit to transmit a signal from the control circuit to the airbag circuit.
No effort has been made to ensure transmission to the inflator, and there is room for further improving the reliability of the airbag system in this regard.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned deficiencies of the prior art, and it is an object of the present invention to provide an airbag inflator having a small electric resistance of a conductor connected to an airbag circuit. An object of the present invention is to provide an in-vehicle rotary connector that can be reliably driven and has excellent reliability.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a pair of concentrically arranged and rotatably connected housings and an annular ring formed between the pair of housings. A plurality of flexible cables, both ends of which are fixed to each of the pair of housings, the plurality of flexible cables being housed in a cable storage space so as to be able to be wound and unwound.
Among the plurality of flexible cables, the flexible cable having the shortest overall length carries a conductor connected to the airbag circuit.

Incidentally, which of the plurality of flexible cables has the shortest overall length can be arbitrarily determined in design. In addition, it is possible to arbitrarily determine which position of the pair of housings to fix both end portions of each flexible cable in design.

When the conductor for the airbag circuit is carried on the flexible cable having the shortest overall length, the electric resistance of the conductor for the airbag circuit can be minimized. When (impact force) acts, a large current can be supplied from the control circuit provided on the stator side to the airbag inflator provided on the steering wheel side. Therefore, airbags
The inflator can be operated reliably, and the reliability of the in-vehicle rotary connector can be improved.

In the vehicle-mounted rotary connector having the above-described structure, when the rotary connector is erroneously assembled to the steering device, the shortest flexible cable, that is, the airbag circuit, is connected by inspection after assembly. Making it easier to cut flexible cables carrying conductors,
In order to prevent an automobile equipped with an unauthorized airbag circuit from being supplied to the market, one ends of the plurality of flexible cables are connected to a first connector, and the plurality of flexible cables are connected. The other end of the flexible cable is connected to a second connector, the first connector is attached to a cable lead-out portion provided on an inner peripheral housing, and the second connector is provided on an outer peripheral housing. The flexible cable having the shortest overall length is attached to the cable lead-out portion and electrically led to the outside, and the winding direction of the plurality of flexible cables is reversed once each in the cable storage space. Is wound around the outer peripheral surface of the inner peripheral housing via another flexible cable, and the other end of the shortest flexible cable is connected via another flexible cable. Said It is particularly preferable to adopt a configuration that is wound on the inner peripheral surface of the peripheral housing.

[0015] For the same reason, in the on-vehicle rotary connector having the above-mentioned structure, both ends of the plurality of flexible cables are respectively inserted into cable lead-out portions formed one by one in the pair of housings, so as to be externally connected. And the winding direction of the plurality of flexible cables is reversed once each in the cable storage space, and one end of the flexible cable having the shortest overall length is connected to another flexible cable. And the other end of the shortest flexible cable is wound around the inner peripheral surface of the outer housing through another flexible cable. It is particularly preferable that the flexible cable having the shortest overall length carry a conductor connected to the airbag circuit.

According to this configuration, even when the mounting position of the rotary connector with respect to the steering device shifts clockwise or counterclockwise due to erroneous assembly, the shortest possible position is determined by the inspection after assembly. Since the flexible cable engages with the edge of the cable lead-out section and is reliably cut, the continuity test of each conductor performed at the time of inspection allows the fact of misassembly to be quickly and reliably known, and an incorrect airbag circuit. Can be prevented from being supplied to the market.

The setting position of the reversing part in the cable storage space can be set arbitrarily as needed. However, in order to prevent interference between the flexible cables, the setting position of the reversing part is required. Are more preferably separated from this viewpoint. From this viewpoint, when the number of flexible cables stored in the cable storage space is n, each reversing part is approximately (360 / n) in the circumferential direction of the cable storage space. ) It is particularly preferred to disperse and arrange every other degree.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a vehicle-mounted rotary connector according to the present invention; FIG. FIG. 1 is a plan view showing the internal structure of the on-vehicle rotary connector according to this embodiment, FIG. 2 is a cross-sectional view of the rotary connector, and FIG. FIG. 4 is a partial explanatory view of a flexible cable, and FIG. 4 is a plan view showing an effect of the on-vehicle rotary connector according to the embodiment.

As shown in FIGS. 1 and 2, the on-vehicle rotary connector of this embodiment comprises a fixed housing 1 and a movable housing 2 concentrically and rotatably connected to the fixed housing 1. And first and second flexible cables 4 and 5 housed in an annular cable housing space 3 formed between the two housings 1 and 2, and are rotatable in the cable housing space 3. It is mainly composed of the stored moving body 6.

The fixed housing 1 is composed of an upper case 7 and a lower case 8 integrated with each other, and the upper case 7 is formed with a cylindrical outer tube portion 9. On the other hand, a movable inner housing 2 is formed with a cylindrical inner cylindrical portion 10.
The fixed housing 1 and the movable housing 2 are
The ring-shaped cable storage space 3 is formed between the outer tube part 9 and the inner tube part 10 by being concentrically combined and rotatably connected to each other.

The moving body 6 includes a ring-shaped rotating plate 11, a plurality of rollers 12 rotatably supported on the rotating plate 11, and a flexible cable 4 of the plurality of rollers 12. , 5 on which specific rollers 12A, 1 are wound in a U-shape
2B and fixed cylinders 13 and 14 that are arranged to face each other in the circumferential direction of the rotating plate 11. A first opening 15 is formed between one specific roller 12A and the fixed cylinder 13, and a second opening 16 is formed between the other specific roller 12B and the fixed cylinder 14. 1st and 2nd
Openings 15, 16 are approximately 18 cm through the center of the rotating plate 11.
It is set at the 0 ° facing position.

The first and second flexible cables 4 and 5 are:
As shown in FIG. 3, a first flexible cable 4 is formed by laminating a plurality of conductors 23 made of copper or the like between two base films 21 and 22 made of an insulating material.
Has a shorter overall length than the second flexible cable 5. A first connector 24 and a second connector 25 are connected to both ends of the first and second flexible cables 4 and 5, respectively. Cable lead-out part 17 provided in
The second connector 25 is attached to the cable lead-out portion 18 provided on the movable housing 2. As a result, one end of each conductor 23 carried by the first and second flexible cables 4 and 5 is led out of the fixed housing 1 via the first connector 24, and the respective flexible cables The other end of each conductor 23 carried on the conductive cables 4 and 5
It is led out of the movable housing 2 through the second connector 25.

As shown in FIG. 1, the first flexible cable 4 whose overall length is shorter than the second flexible cable 5 has one end, that is, the connection side to the first connection connector 24, at the second end. 2
The flexible cable 5 is wound around the inner peripheral surface of the outer tubular portion 9, and the other end side, that is, the connection side to the second connector 25 is connected via the second flexible cable 5. It is wound around the outer peripheral surface of the inner cylinder 10. In addition, the first flexible cable 4
Is wound in a U-shape around the first specific roller 12A after passing through the first opening 15 so that the reversal portion 4a is formed.

On the other hand, as shown in FIG. 1, the second flexible cable 5 having a longer overall length than the first flexible cable 4 has
The side connected to the first connector 24 is directly wound around the inner peripheral surface of the outer tubular portion 9, and the side connected to the second connector 25 is directly wound around the outer peripheral surface of the inner tube 10. Further, the second flexible cable 5 has a portion in the length direction which is the second flexible cable 5.
And is wound in a U-shape around the second specific roller 12B through the opening 16, thereby forming the reversing portion 5a.

In the in-vehicle rotary connector of this embodiment, as shown in FIGS. 3 (a) and 3 (b), the first flexible cable 4 having a short overall length is provided with two wide air wires. The second flexible cable 5, which carries a bag circuit conductor 23a and four horn circuit and switch circuit conductors 23b formed narrower than this, and has a longer overall length, has a narrower width. Six formed horn circuit and switch circuit conductors 23b are carried.

In the rotary connector having the above construction, the fixed housing 1 is fixed to the stator member of the steering device, and the movable housing 2 is fixed to the steering wheel, which is the rotor member of the steering device, and attached to each of the housings 1 and 2. The vehicle is mounted on the vehicle by connecting an external connector (not shown) provided in an airbag circuit, a horn circuit, or the like to the connection connectors 24, 25 provided. When the rotary connector is mounted on the steering device, the neutral position of the movable housing 2 with respect to the fixed housing 1 and the neutral position of the steering device are strictly matched.
The first and second flexible cables 4 and 5 are adjusted so that a tension equal to or greater than a predetermined value does not act within the movable range of the steering wheel.

Hereinafter, the operation of the on-vehicle rotary connector according to the above configuration will be described.

When the steering wheel is rotated clockwise from the neutral position, the rotational force is transmitted to the movable housing 2 and the movable housing 2 is rotated clockwise. And the second flexible cables 4 and 5 are tightened. At this time, the reverse portion 4a of the first flexible cable 4 is connected to the first specific roller 12A.
And the reverse portion 5 of the second flexible cable 5
a comes into contact with the second specific roller 12B,
Receives a uniform pressing force from each of the flexible cables 4 and 5, and smoothly rotates clockwise with a rotation amount of about 1/2 of the movable side housing 2. Further, since the flexible cables 4 and 5 wound around the inner cylindrical portion 10 are drawn out from the outer cylindrical body 9, almost no tension acts on the first and second flexible cables 4 and 5. Therefore, the continuity of each circuit is maintained.

On the other hand, when the steering wheel is rotated counterclockwise from the neutral position, the rotational force is transmitted to the movable housing 2 and the movable housing 2 rotates counterclockwise. The first and second flexible cables 4 and 5 are unwound from the inner cylinder 10. At this time, the inverted portion 4a of the first flexible cable 4 comes into contact with the first fixed cylinder 13 and the second flexible cable 5
Of the movable housing 2 receives an equal pressing force from each of the flexible cables 4 and 5, and the rotation amount of the movable housing 2 is about one half. To rotate smoothly counterclockwise. Further, the flexible cables 4 and 5 that are unwound from the inner cylindrical portion 10 are sequentially wound around the inner peripheral surface of the outer cylindrical body 9, so that the first and second flexible cables 4 and 5 are also wound. 5 is hardly affected by tension, and the continuity of each circuit is maintained.

In the on-vehicle rotary connector according to the embodiment, since the conductor 23a for the airbag circuit is carried on the first flexible cable 4 having a short overall length, the second flexible cable 5 having a long overall length is provided. The electric resistance value of the conductor 23a for the airbag circuit can be reduced as compared with the case where the conductor 23a for the airbag circuit is carried on the vehicle body, and when an acceleration (impact force) exceeding a predetermined value acts on the body of the automobile. In addition, since a large current can be supplied from the control circuit provided on the stator side to the airbag inflator provided on the steering wheel side, the airbag inflator can be reliably operated, and the reliability is excellent. .

Further, in the on-vehicle rotary connector according to the embodiment, one end of the first flexible cable is wound around the inner peripheral surface of the outer tubular portion 9 via the second flexible cable. At the same time, the other end of the first flexible cable is wound around the outer peripheral surface of the inner cylindrical portion 10 via the second flexible cable 5, so that erroneous assembly of the rotary connector with respect to the steering device is prevented. If this occurs, the first flexible cable 4 carrying the airbag conductor 23a is likely to be preferentially cut, and it is possible to quickly and reliably know the disconnection or poor connection of the airbag circuit due to erroneous assembly. Therefore, it is possible to prevent an automobile equipped with an unauthorized airbag circuit from being supplied to the market.

That is, when the rotary connector is erroneously assembled to the steering device, and a shift occurs between the neutral position of the movable housing 2 with respect to the fixed housing 1 and the neutral position of the steering device, the amount of the shift is reduced. When the allowable value of the rotary connector is exceeded, the flexible cables 4 and 5 fall into a state in which the flexible cables 4 and 5 cannot be tightened or cannot be rewound in any part within the movable range of the steering wheel. FIG. 4A is a plan view of a main part schematically showing a rotary connector that has fallen into an unwound state, and FIG. 4B is a plan view of a main part schematically showing a rotary connector that has fallen into a non-rewindable state. is there.

As shown in FIG. 4 (a), even when the flexible cables 4 and 5 are completely wound around the outer cylinder 9 within the movable range of the steering wheel, FIG. As shown in b), even when the flexible cables 4 and 5 are completely wound around the inner tube 10, the first flexible cable 4 is provided on the outer tube 9. Bent at an acute angle by the edge of the portion 17 or the edge of the cable lead-out portion 18 provided in the inner cylinder portion 10,
The first flexible cable 4 is connected to the second flexible cable 5
Since a larger tension is applied, the first flexible cable 4 is preferentially cut.

The air bag circuit is usually provided with a disconnection monitoring device. In addition, in the process of assembling a car, the steering wheel is rotated from one end of the movable range to the other end after the rotary connector is installed in the steering device. To check for disconnection or poor connection.
If the conductor 23a for the airbag circuit is carried on the first flexible cable 4 that is easily cut as in the rotary connector according to the above-described embodiment, disconnection or poor connection of the airbag circuit due to erroneous assembly can be prevented. Know quickly and reliably,
It is possible to prevent an automobile equipped with an unauthorized airbag circuit from being supplied to the market.

In addition, in the on-vehicle rotary connector according to the embodiment, the number of flexible cables accommodated in the cable accommodating space 3 is limited to two.
The position of 5a can be sufficiently separated, the interference of the flexible cables 4 and 5 can be prevented, and the rotation of the movable housing 2 with respect to the fixed housing 1 can be smoothly performed.

In the vehicle-mounted rotary connector according to the embodiment, one ends of the first and second flexible cables 4 and 5 are connected to one connector 24, and the other end is connected to another one connector. Since it is connected to the connector 25, the fixed housing 1
Alternatively, it is easy to derive the flexible cables 4 and 5 from the movable side housing 2 and to connect the flexible cables 4 and 5 to an external circuit, which is excellent in assemblability and workability.

Further, in the on-vehicle rotary connector according to the embodiment, the set positions of the plurality of reversing portions 4a and 5a in the cable storage space 3 are determined by the number of flexible cables stored in the cable storage space 3. When n is assumed to be n, the cables are arranged at intervals of about (360 / n) degrees with respect to the circumferential direction of the cable storage space 3, so that the flexible cables 4 and 5 are prevented from interfering with each other, and The rotation of the movable housing 2 with respect to the housing 1 can be made smooth.

Hereinafter, other embodiments of the on-vehicle rotary connector according to the present invention will be described.

(1) In the above embodiment, one connector 24, 25 is connected to both ends of the flexible cables 4, 5, respectively. However, the number of connectors is not limited at all. If necessary, a plurality of connectors can be connected to one end. In this case, as shown in FIG. 5 (a), different connectors 24a, 24b, 25
a and 25b can be connected, and as shown in FIG. 5B, both ends of each of the flexible cables 4 and 5 are branched.
One of the branched first flexible cables 4 and one of the second flexible cables 5 are connected to the connectors 24a and 25a, and the other of the branched first flexible cables 4 and the second 2 and the other of the flexible cables 5 to the connector 24b,
25b. In this case, as shown in FIGS. 5A and 5B, the connectors 24a, 25a or 24b, 25b connected to the respective ends of the flexible cables 4, 5 are arranged at positions separated from each other. Or can be placed at a position due to the back.

(2) In each of the above embodiments, the connecting connectors 2 are provided at both ends of the flexible cables 4 and 5, respectively.
Although the cables 4 and 25 are connected, one end or both ends of each of the flexible cables 4 and 5 may be directly inserted into the cable lead-out portions 17 and 18 without going through a connection connector and led out.

(3) In the above embodiment, the moving body 6 is housed in the cable housing space 3, but the reversing section 4a,
If the movement of 5a can be performed smoothly, it can be omitted.

(4) In the above embodiment, the number of the conductors 23 carried by one flexible cable is six, but the number of the conductors 23 is not limited at all. Any number equal to or less than six or six or more can be used.

(5) In the above embodiment, the conductor 23a for the airbag circuit is formed wider than the conductor 23b for the other circuits. However, when there is no hindrance to the conduction of the airbag circuit, These conductors 23a and 23b can be formed to have the same line width.

(6) In the above embodiment, the number of flexible cables stored in the cable storage space 3 is 2
Although the number of flexible cables is limited, the number of flexible cables is not limited at all, and three or more flexible cables can be stored.

[0045]

According to the first aspect of the present invention, since the conductor for the airbag circuit is carried on the flexible cable having the shortest total length, the other flexible cable having the longest total length is provided with the conductor for the airbag circuit. The electric resistance value of the conductor for the airbag circuit can be minimized as compared with the case where the conductor is carried, and is provided on the stator side when an acceleration (impact force) exceeding a predetermined value acts on the body of the automobile. Since a large current can be supplied from the control circuit to the airbag inflator provided on the steering wheel side, the airbag inflator can be reliably operated, and the reliability is excellent.

According to the second and third aspects of the present invention, one end of a flexible cable having the shortest overall length among a plurality of flexible cables stored in a cable storage space is connected to another flexible cable. Wound around the outer peripheral surface of the inner peripheral housing via a flexible cable, and the other end of the flexible cable having the shortest overall length is connected to the inner peripheral surface of the outer peripheral housing via another flexible cable. Because of the winding, in the case of erroneous assembly of the rotary connector with respect to the steering device, the flexible cable carrying the conductor for the airbag, that is, the flexible cable having the shortest overall length is likely to be preferentially cut, Since the disconnection or connection failure of the airbag circuit due to erroneous assembly can be quickly and reliably known, it is possible to prevent an automobile equipped with an incorrect airbag circuit from being supplied to the market.

According to the invention described in claim 4 of the present application, when the number of the flexible cables stored in the cable storage space is n, the setting position of the plurality of reversing parts in the cable storage space is n. About the circumferential direction of (360
/ N) Since the flexible cables are arranged at every degree, interference of each flexible cable is prevented, and the rotation of the movable side housing with respect to the fixed side housing can be made smooth.

[Brief description of the drawings]

FIG. 1 is a plan view showing an internal structure of a vehicle-mounted rotary connector according to an embodiment.

FIG. 2 is a cross-sectional view of the rotary connector according to the embodiment.

FIG. 3 is a partial explanatory view of two flexible cables stored in the on-vehicle rotary connector according to the embodiment.

FIG. 4 is a plan view of a main part showing a state in which a flexible cable is wound around a fixed housing and a movable housing when a rotary connector is erroneously assembled.

FIG. 5 is a plan view showing the internal structure of a vehicle-mounted rotary connector according to another embodiment.

FIG. 6 is a plan view showing an internal structure of a vehicle-mounted rotary connector according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed side housing 2 Movable side housing 3 Cable storage space 4,5 Flexible cable 6 Moving body 11 Rotating plate 12 Roller 12A, 12B Specific roller 13,14 Fixed cylinder 15 First opening 16 Second opening 17,18 Cable lead-out part 21, 22 Base film 23 Conductor 23a Conductor for airbag circuit 23b Conductor for horn circuit and switch circuit 24, 25 Connector

Claims (4)

[Claims] 1. A pair of housings arranged concentrically and rotatably connected to each other and housed in an annular cable storage space formed between the pair of housings so as to be able to be tightened and unwound. Comprises a plurality of flexible cables fixed to each of the pair of housings,
A vehicle-mounted rotary connector, wherein a conductor connected to an airbag circuit is carried on a flexible cable having the shortest overall length among the plurality of flexible cables. 2. An end of each of the plurality of flexible cables is connected to a first connector, and the other end of each of the plurality of flexible cables is connected to a second connector. The first connector is attached to a cable lead-out portion provided in the inner peripheral housing, and the second connector is attached to a cable lead-out portion provided in the outer peripheral housing to electrically lead to the outside. The winding directions of the flexible cables are reversed once each in the cable storage space, and one end of the shortest flexible cable is connected to the inner peripheral housing via another flexible cable. And the other end of the flexible cable having the shortest overall length is wound around the inner peripheral surface of the outer peripheral housing via another flexible cable. Item 1 In-vehicle rotary connector. 3. Both ends of each of the plurality of flexible cables are inserted into cable lead-out portions formed one by one in the pair of housings, and are electrically led out to the outside.
The winding directions of the plurality of flexible cables are reversed once each in the cable storage space, and one end of the shortest flexible cable is connected to the inner peripheral side via another flexible cable. The flexible cable having the shortest overall length is wound around the outer peripheral surface of the housing, and the other end of the flexible cable having the shortest overall length is wound around the inner peripheral surface of the outer peripheral housing via another flexible cable. Item 2. A vehicle-mounted rotary connector according to item 1. 4. When the number of flexible cables stored in the cable storage space is n, the inverted portions of the plurality of flexible cables are set to about (360) in the circumferential direction of the cable storage space. The on-vehicle rotary connector according to any one of claims 1 to 3, wherein the on-vehicle rotary connector is arranged so as to be distributed every (/ n) degrees.