JPS6355191B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a brushless electrical signal transmission device that transmits and receives electrical signals between a rotating body that reciprocates within a limited number of rotations and a fixed body. It is.

(Prior Art) As a means for transmitting and receiving electrical signals with high reliability between a rotating body that reciprocates within a limited number of revolutions, such as a steering device of an automobile, and a fixed body, FIGS. A brushless electrical signal transmission device 1 as shown in the figure has been proposed. This brushless electrical signal transmission device 1 has a flexible electrical circuit body 5 spirally wound within a donut-shaped space 4 formed by a first housing 2 and a second housing 3 that are assembled so as to be rotatable with respect to each other. It is accommodated. The first housing 2 and the second housing 3 are connected by a washer 6 and a snap ring 7. One of the first housing 2 and the second housing 3 is fixed to a rotating body (not shown), and the other is fixed to a fixed body (not shown). The flexible electrical circuit body 5 is made of a conductive metal strip, a flexible printed circuit board, or the like. One end of the flexible electrical circuit body 5 is fixed to the first housing 2, and the other end is fixed to the second housing 3, respectively, and led out to the outside, and connected to electrical devices, etc. disposed on the rotating body and the fixed body, respectively. It's becoming like that.

Such a brushless electric signal transmission device 1 includes:
The rotation of one housing is absorbed by the winding and unwinding of the spiral flexible electrical circuit body 5,
The signal is not transmitted to the other housing, and is always electrically connected directly through the flexible electrical circuit body 5, so that electrical signals can be sent and received between the rotating body and the fixed body with high reliability. be able to.

However, in the brushless electric signal transmission device 1 having such a structure, the length of the flexible electrical circuit body 5 is required to be very long in order to absorb rotational force, which increases the cost of the flexible electrical circuit body 5 and increases the cost of the flexible electrical circuit body 5. The drawback was that the electrical resistance value was high. Further, for example, if a flexible printed circuit board is to be used as the flexible electrical circuit body 5, it may not be possible to manufacture the flexible printed circuit board because the length of the flexible printed circuit board that can be manufactured industrially is usually limited. Moreover, even if it were manufactured, it had the disadvantage that the manufacturing cost would be extremely high. Moreover, in such a structure, since the length of the flexible electrical circuit body 5 is long, there is a drawback that assembly of the device becomes difficult.

(Object of the Invention) An object of the present invention is to provide a brushless electrical signal transmission device that can shorten the length of a flexible electrical circuit body.

(Structure of the Invention) In order to achieve the above-mentioned object, the present invention provides for a flexible electric circuit body having a certain length to be housed in a chamber formed by a relatively rotatable first housing and a second housing, and for the flexible electric circuit body to be In the brushless electric signal transmission device, one end of the body is fixed to the first housing and the other end is fixed to the second housing, gears are fixed concentrically to opposing parts of both the housings, respectively. A planetary gear is disposed between the two gears, which meshes with these gears at the same time and revolves while rotating, a planetary reel is connected to the planetary gear, and a planetary reel is connected to the planetary reel, and a planetary gear is connected to the planetary gear, and a planetary gear is connected to the planetary gear, and a planetary gear is connected to the planetary gear, and a planetary gear is connected to the planetary gear, and a planetary gear is connected to the planetary gear, and a planetary gear is connected to the planetary gear, and a planetary gear is connected to the planetary gear, and a planetary gear is connected to the planetary gear, and a planetary gear is connected to the planetary gear, and a planetary gear is connected to the planetary gear, and a planetary gear is connected to the planetary gear. It is characterized in that the part is supported so that winding and unwinding can be performed.

With such a structure, the length of the flexible electrical circuit body can be shortened.

(Example) Examples of the present invention will be described in detail below with reference to the drawings. As shown in FIGS. 3 and 4, in the brushless electric signal transmission device 1 of this embodiment,
An internal gear 8 and an external gear 9 are fixed concentrically to opposing portions of a relatively rotatable first housing 2 and a second housing 3, respectively.
Disposed between these gears 8 and 9 is a planetary gear 10 that meshes with these gears at the same time and revolves around its axis. A planetary reel 12 is integrally connected to the planetary gear 10 via a shaft 11. The shaft 11 cannot rotate relative to the planetary gear 10, but is fitted by knurling or keying so that it can slide in the axial direction. The shaft 11 is fitted into each hole 14 of a pair of upper and lower planetary driving wheels 13 that are arranged concentrically with respect to the first and second housings 2 and 3. It is designed to prevent vertical vibration. The flexible electrical circuit body 5 is folded back at approximately the central portion in the longitudinal direction, and this folded portion 5A is fitted and supported in a recess 15 on the outer periphery of the planetary reel 12. Therefore, the flexible electrical circuit body 5 is wound around the outer periphery of the planetary reel 12 and unwound in layers. One end of the flexible electrical circuit body 5 is fixed to the first housing 2, and the other end is fixed to the second housing 3.

In such a brushless electric signal transmission device 1, as one of the housings rotates, the planetary reel 12 rotates around the axis 11 and also revolves around the body 3A of the second housing 3. Due to this movement, the flexible electrical circuit body 5 is wound up (or unwound) onto the planetary reel 12 and is unwound from the inner circumferential surface of the first housing 2 (or unwound onto the inner circumferential surface of the first housing 2). , are simultaneously unwound (or wound up) from the second housing 3. Therefore, the rotation of one of the housings is absorbed by the flexible electrical circuit body 5 being wound up and unwound around the outer periphery of the planetary reel 12, and no rotational force is transmitted to the other housing, and electricity is not transmitted to the other housing. The signal passes through the flexible electrical circuit body 5 that is always connected to the first and second terminals.
Transmission takes place between the housings 2 and 3 of.

Next, the reason why the length of the brushless electrical circuit body 5 is shorter in the apparatus of the present invention than in the conventional apparatus will be explained.

First, the length of the flexible electrical circuit body 5 in the conventional brushless electric signal transmission device 1 is determined with reference to FIGS. 5 and 6. FIG. 5 shows a state in which the flexible electrical circuit body 5 is tightly wound in M turns around the outer periphery of the body 3A of the second housing 3, and FIG. It shows a state in which N turns are tightly wound. If the second housing 3 is rotated in the direction of arrow A from the state shown in FIG. 5, it will become as shown in FIG. 6, and if the second housing 3 is further rotated in the same direction, the flexible electrical circuit body 5 will be damaged. . Therefore, the number of rotations X of the second housing 3 is
=(M−N). Therefore, the number N of windings of the flexible electrical circuit body 5 on the body 3A of the second housing 3 is N=(X+M). Therefore, the required length of the flexible electrical circuit body 5 in the conventional device is such that it can be wrapped around the body 3A of the second housing 3 N times, that is, (X+M) times.

Next, the brushless electric signal transmission device 1 of the present invention
The length of the flexible electrical circuit body 5 in is determined with reference to FIG. When the second housing 3 is rotated in the direction of the arrow, the planetary reel 12 rotates between the planetary gears 9,
10, and its rotation and revolution directions are as shown in the figure. When the rotation speed of the second housing 3 is 1 and the revolution speed of the planetary reel 12 is α, α is α<1. Therefore, when the second housing 3 rotates once, the planetary reel 12 revolves α times in the same direction. 5 and 6, if the number of times that the second housing 3 can be rotated is X times, the flexible electrical circuit body 5 is attached to the body portion 3A of the second housing 3 X (1-α) times. Can be wrapped around. Therefore, the required length of the flexible electrical circuit body 5 in the device of the present invention is such that it can be wrapped around the body 3A of the second housing 3 X (1-α) times.

Comparing (X+M) and X(1-α), (X+M) > Can be shortened.

Note that in the above explanation, the second housing 3 is used as a rotator and the first housing 2 is used as a stator, but the same thing can be achieved even if the first housing 2 is used as a rotator and the second housing 3 is used as a stator. Become. Also, in the above explanation, the first
The explanation has been made without including the connecting portion spanning the housing 2 and the second housing 3.

In this embodiment, the flexible electrical circuit body 5 is explained as having one continuous length by folding back the approximately central portion in the longitudinal direction, but it may also be of a two-strip type in which approximately the central portion in the longitudinal direction is connected. . In this way, when the flexible electrical circuit body 5 is a flexible printed circuit board, the manufacturing cost can be further reduced.

(Effects of the Invention) As explained above, the brushless electric signal transmission device according to the present invention includes gears provided on opposing surfaces of the first and second housings, a planetary gear meshed between these gears, and a planetary gear meshed between the gears. The flexible electrical circuit body is made to support a planetary reel, and this planetary reel supports the approximately central portion in the length direction of the flexible electrical circuit body to perform winding and unwinding, so the length of the flexible electrical circuit body is shortened compared to the conventional one. be able to. Therefore, the electrical resistance value of the flexible electrical circuit body can be reduced, and the cost can also be reduced. Furthermore, if the electrical resistance value remains the same as before, the length of the flexible electrical circuit body is shortened.
It is advantageous in terms of size because the width can be reduced. Moreover, when the flexible electrical circuit body is a flexible printed circuit board, it is preferable because not only the length of the flexible circuit body can be shortened, making it easier to manufacture it, but also the manufacturing cost can be further reduced.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a conventional device, and Figure 2 is a vertical cross-sectional view of a conventional device.
3 is a longitudinal sectional view of an embodiment of the device according to the present invention, and FIG. 4 is a line BB in FIG. 3.
The line end view, FIGS. 5 and 6 are explanatory diagrams for explaining the length of the flexible electrical circuit body of the conventional device,
FIG. 7 is an explanatory diagram for explaining the length of the flexible electrical circuit body of the device of the present invention. DESCRIPTION OF SYMBOLS 1... Brushless electric signal transmission device, 2... First housing, 3... Second housing, 3A
... Body part, 4 ... Space, 5 ... Flexible electric circuit body, 5A ... Turning part, 8, 9 ... Gear, 10
... Planetary gear, 11 ... Shaft, 12 ... Planetary reel, 13 ... Planetary driving wheel, 14 ... Hole, 15 ... Recess.

Claims (1)

[Claims] 1 A relatively rotatable first housing and a second housing
A brushless electric signal, wherein a flexible electrical circuit body having a certain length is housed in a chamber formed by a housing, one end of the flexible electrical circuit body is fixed to the first housing, and the other end is fixed to the second housing. In the transmission device, gears are fixed concentrically to opposing portions of both the housings, and a planetary gear that meshes with these gears simultaneously and revolves while rotating is disposed between the two gears, and the planetary gear is connected to the planetary gear. A brushless electric signal transmission device, characterized in that a planetary reel is connected to the flexible electrical circuit body, and a substantially central portion of the flexible electrical circuit body in the longitudinal direction is supported by the planetary reel so that winding and unwinding can be performed.