JPH065172U - Transmission device between two relatively rotating members - Google Patents

Abstract

(57) [Summary] [Structure] The inner case 1 and the outer case 2 are rotatably combined with each other, and the spirally wound flat cable 3 is housed therein, and the inner end side 3a of the flat cable is attached to the inner case 1. In the transmission device between the two relatively rotating members having the outer end side 3b attached to the outer case 2,
The flat cable 3 is coated with a viscous fluid having a weak viscosity that does not hinder the tightening and loosening of the flat cable. [Effect] When the flat cables are adjacent to each other, they are lightly adhered, and when they collide, the viscous fluid serves as a cushion, so that it is possible to obtain a transmission device that does not generate abnormal noise even when subjected to vibration.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transmission device between two relatively rotating members used for transmitting electric signals, optical signals, etc. between the two relatively rotating members.

[0002]

[Prior art]

 1 and 2 show a conventional transmission device between two relatively rotating members. In this transmission device, an inner case 1 and an outer case 2 coaxially arranged are relatively rotatably combined, and a flat cable 3 wound in a space formed by the inner case 1 and the outer case 2 is wound. And 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 2.

This device operates as follows. First, the state of FIG. 1 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 elasticity of the flat cable 3 itself expands the winding diameter, 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 within the range from the state of FIG. 1 to the state of FIG. 2 and from the state of FIG. 2 to the state of FIG. It is possible. 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.

[0005]

[Problems to be Solved by the Invention] Since the flat cable is movable in the case in this device, when the flat cable is subjected to vibration, the inner layer side and the outer layer side of the flat cable collide with each other to generate abnormal noise. I have something to do. This type of transmission device is often used for transmitting and receiving electrical signals between the steering wheel side and the vehicle body side when mounted on the steering shaft of an automobile, so if vibration causes abnormal noise, it will There is a problem of giving pleasure.

[0006]

[Means for Solving the Problems]

 The present invention provides a transmission device between two relatively rotating members, which solves the above problems, and has a structure in which an inner case and an outer case coaxially arranged are relatively rotatably combined. , A flat spirally wound cable is stored in the space formed by the inner case and the 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. The surface of the cable is characterized by being coated with a viscous fluid having a weak viscosity that does not hinder the tightening and loosening of the flat cable.

[0007]

[Action]

 By doing this, when the inner layer side and the outer layer side of the flat cable are adjacent to each other, they are weakly adhered, and when they collide with each other, the viscous fluid forms a cushion, which causes abnormal noise even when subjected to vibration. Will not do.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 3 shows an example of a flat cable used in the transmission device of the present invention. The flat cable 3 is formed by integrating a plurality of tape-shaped conductors 4 arranged in parallel by sandwiching a plastic film 5 from both sides, and applying a viscous fluid 6 having a weak viscosity to the surface of the plastic film 5. is there.

As shown in FIGS. 1 and 2, the flat cable 3 as described above is housed in a space formed by an inner case 1 and an outer case 2 in a spiral wound manner, so that the transmission device of the present invention can be realized. Composed. The viscous fluid 6 has a weak viscosity that does not hinder the tightness and looseness of the flat cable 3 caused by the relative rotation of the inner case 1 and the outer case 2. For example, grease or the like can be used.

[0010]

[Effect of device]

 As described above, according to the present invention, since the viscous fluid having a weak viscosity is applied to the flat cable, the flat cable is lightly adhered when adjacent to it, and the viscous fluid is applied to the cushion when it is collided. Therefore, it is possible to obtain a transmission device that does not generate abnormal noise even if it receives vibration.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state where an inner case is rotated in a direction of an arrow B to a limit in a transmission device according to the present invention.

FIG. 2 is a cross-sectional view showing a state in which the inner case is rotated to the limit in the direction of arrow A from the state of FIG.

FIG. 3 is a perspective view showing an example of a flat cable used in the transmission device of the present invention.

[Explanation of symbols]

 1: Inner case 2: Outer case 3: Flat cable 4: Tape-shaped conductor 5: Plastic film 6: Viscous fluid

Claims (1)

[Scope of utility model registration request] 1. An inner case and an outer case coaxially arranged are rotatably combined with each other, and a spirally wound flat cable is housed in a space formed by the inner case and the outer case. In a transmission device between two relatively rotating members, the end side of which is attached to the inner case and the outer end side of which is attached to the outer case, the flat cable may be wound on the surface of the flat cable so as not to hinder the tightening and loosening of the flat cable. A transmission device between two relatively rotating members, characterized in that a viscous fluid having a weak viscosity is applied.