JP2004048849A - Power supply device for moving body - Google Patents

Abstract

A mobile body that can supply power to a mobile body even in a confined space without increasing the width of a storage box or the width of a flat cable even when power is supplied to the mobile body that requires a multi-core flat conductor. Get a power feeding device.
A flat cable connected to an electric device supported by a moving body is divided into a flat cable for power supply 1A and a flat cable for signal supply 1B. These flat cables 1A and 1B are overlapped and wound with the signal supply flat cable 1B on the inside and the power supply flat cable 1A on the outside.
[Selection] Figure 1

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power feeding device for a moving body that can be wound and rewound by following a moving body such as a cover of an electric device or a door of an automobile.
[0002]
[Prior art]
Flat cables have been used for electrical wiring of electrical equipment and automobiles. As shown in FIGS. 5 (A) and 5 (B), the flat cable 1 is normally coated with a flat insulating coating 3 made of plastic such as polyethylene terephthalate on a flat conductor 2 made of a strip-like conductor such as copper or aluminum arranged in parallel. It has a structured. Such a flat cable 1 is used as a power supply wiring body for a luggage door, a slide door, or the like of an automobile by utilizing the repulsive force.
[0003]
That is, as shown in FIG. 6, one flat cable 1 is wound in the storage box 4, and the terminal 1a of the flat cable 1 extending from the storage port 5 moves to the left and right like a slide door. It is connected to a power feeding device such as a lamp, a motor, and a control device fixed to a moving body (not shown). On the other hand, the center terminal 1 b of the flat cable 1 wound up in the storage box 4 is connected to the power supply or transmission wiring part at the connection part 7 of the terminal fixing part 6.
[0004]
When the terminal 1 a of the flat cable 1 is pulled along with the movement of the moving body, the flat cable 1 is rewound and fed out from the storage port 5. A helical guide 8 is provided in the center of the storage box 4 so that the flat cable 1 does not become the minimum winding diameter or less when the flat cable 1 is rewound or wound.
[0005]
On the other hand, when the moving body moves to the storage box 4 side, the flat cable 1 is wound into a spring shape by its self-restoring force and stored in the storage box 4 from the storage port 5. Further, a guide portion 9 is provided in the storage box 4 so that the flat cable 1 is rolled back in a circular shape.
[0006]
Further, in another conventional example, as shown in FIG. 7, when the flat cable 1 does not require a very long pull-out length, it is a flat fixed to a moving body such as a back door 10 of a car. The other end side of the cable 1 is stored in a storage box 14 that is sandwiched between rollers 11 and 12 and fixed to the body 13 side. The flat cable 1 on the opposite side of the back door 10 is fixed to a terminal fixing portion 15 and connected to a power or signal power supply wiring portion. Each of the rollers 11 and 12 includes a clock spring 16 and is disposed in the roller unit 17. The flat cable 1 pulled along with the rotation of the back door 10 rewinds the clock spring 16 by the rotation of the rollers 11 and 12, and the flat cable 1 moves along the rotation of the back door 10 and the force of the winding spring of the clock spring 16. Thus, the mechanism is pulled into the storage box 14.
[0007]
The flat cable 1 used in these structures is usually one in which a plurality of parallel copper flat conductors 2 having a thickness of 0.15 mm to 0.3 mm are coated with a flat insulation coating 3. The flat conductor 2 is used as a wiring to a power load of several amperes or more and a signal wiring of several milliamperes. Alternatively, a plurality of flat conductors 2 having a thickness of 0.15 mm to 0.3 mm for power and 0.1 for signals are used in accordance with the type and number of loads supported by the moving body on one flat cable 1. A flat cable 1 in which a plurality of flat conductors 2 having a thickness of mm or less is arranged in parallel is used.
[0008]
[Problems to be solved by the invention]
However, in the structure in which one flat cable 1 is wound around the storage boxes 4 and 14 in this way, the flat cable 1 in which the flat conductors 2 corresponding to the number of wires necessary for power supply, signal use and power supply are arranged in parallel. When the number of flat conductors 2 is large, the width of the flat cable 1 is widened, which makes it difficult to install the storage boxes 4 and 14 and to wire the flat cable 1 in a narrow place. was there. In addition, using the flat cable 1 in which the flat conductors 2 having different thicknesses and widths are arranged in parallel on one flat cable 1 increases the cost and causes the flat cable 1 to be bent due to the thickness of the flat conductor 2. Since such stress increases, there is a problem that the winding of the flat cable 1 can be designed only with the minimum winding diameter corresponding to the number of durable bendings that the thick flat conductor 2 for power can accept.
[0009]
The object of the present invention is to supply power to a moving body even in a narrow place without increasing the width of a storage box or the width of a flat cable, even when supplying power to a moving body that requires a multicore flat conductor. An object of the present invention is to provide a power supply device for a movable body.
[0010]
[Means for Solving the Problems]
The present invention relates to a moving body wound in a storage box so that a flat cable connected to an electric device supported by the moving body can be wound and rewound following the movement of the moving body. For power supply devices.
[0011]
In the power supply device to the moving body according to the present invention, the flat cable is composed of a plurality of flat cables divided into power supply and signal supply, and these flat cables are wound in layers.
[0012]
In this way, the flat cable is composed of a plurality of flat cables that are divided into power supply and signal supply, and when these flat cables are lap-wrapped, it is suitable for power supply to a moving body that requires a multi-core flat conductor. However, power can be supplied to the moving body even in a narrow place without increasing the width of the storage box or the flat cable.
[0013]
The flat cable has the property that the flat cable winding and unwinding durability varies depending on the thickness of the flat conductor, but the flat conductor is thicker than the flat conductor of the flat cable for signal supply, and power supply is weak against bending stress. If the flat cable is disposed outside the winding radius, the reliability of winding and rewinding can be improved.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show an example of an embodiment of a power feeding device for a moving body according to the present invention. FIG. 1 is a cross-sectional view of the power feeding device for a moving body of this example, and FIG. It is a perspective view of the connection part of the flat cable and electric power feeding harness in the winding center part of the electric power feeder to the moving body shown in FIG. Note that portions corresponding to those in FIG. 6 are denoted by the same reference numerals.
[0015]
In the power supply device to the moving body of this example, as shown in FIG. 1, the flat cable is divided into a power supply flat cable 1A and a signal supply flat cable 1B. The power supply flat cable 1A and the signal supply flat cable 1B are wound with the signal supply flat cable 1B on the inside and the power supply flat cable 1A on the outside.
[0016]
In the winding center portion of the power supply flat cable 1A and the signal supply flat cable 1B, the ends of the flat cables 1A and 1B are connected to the power supply harness 18 via the terminal fixing portion 6, as shown in FIG. ing. In other words, the conductor terminals of the flat cables 1A and 1B are connected to a plurality of L-shaped bus bars 19 inside the terminal fixing portion 6, and at the end portions 6A protruding outside the storage box 4, the inner L-shaped bus bars An end portion 19 is connected to a female terminal in the connector 20 of the power supply harness 18.
[0017]
By the way, in a power feeding device to a moving body that repeatedly winds and unwinds such a flat cable, the relationship between the stress generated in the bent portion of the flat cable, the thickness of the flat cable and the flat conductor, and the bending radius is as follows. It can be expressed as:
[0018]
σ = (t / 2) E / [R + (t ′ / 2)]
Here, σ: stress occurring in the winding portion, t: flat conductor thickness, t ′: flat cable total thickness, E: Young's modulus of the flat conductor, R: radius of bending the flat cable As apparent from this equation The stress σ applied to the flat cable by repeated bending increases as the thickness of the flat cable, particularly the thickness of the flat conductor, increases when the bending radius is constant, and when the stress σ applied to the flat cable is regulated, It can be seen that it is necessary to increase the bending radius R of the flat cable.
[0019]
In actual use of the power supply apparatus for a moving body as described above, generally, the number of repeated bending durability of a flat cable corresponding to the number of repeated movements of the moving body is obtained as a use condition.
[0020]
Accordingly, a flat cable winding mechanism designed with a minimum bending radius to satisfy the required number of bending durability is required.
[0021]
FIG. 3 shows the relationship between the number of sliding bends and the repeated bend radius determined by the test method of FIG. The flat cable for power supply 1A has a flat conductor thickness of 0.25 mm, a width of 2.8 mm, a flat insulation coating thickness of 0.05 mm, and an adhesive that bonds the flat insulation coating to each other with the flat conductor in between. The flat cable 1B for signal supply having a thickness of 0.04 mm has a flat conductor thickness of 0.1 mm, a width of 2.5 mm, a flat insulating coating thickness of 0.05 mm, and an adhesive thickness of 0 mm. This is a result of using a size of .04 mm. This result is clear from the above-described stress equation occurring in the bending portion. For example, when the required number of bendings is required to be 500,000 or more, the minimum bending radius of the signal supply flat cable 1B is about 12 mm. However, the power supply flat cable 1A requires a bending radius of about 20 mm or more. The number of sliding bends on the horizontal axis in FIG. 3 is scaled logarithmically.
[0022]
In this test, the flat cable 1 is positioned with a radius R between the side walls W1 and W2 as shown in FIG. 4, and the flat cable 1 along one of the side walls W1 and W2 is moved along the side wall W1 or the side wall W2. It is moved up and down, a repeated bending stress of bending radius R is generated in the flat cable 1, and the number of bendings when the flat conductor breaks is measured.
[0023]
As described above, the power supply flat cable 1A with a thick flat conductor cannot be repeatedly bent with the same curvature as the signal supply flat cable 1B with a thin flat conductor, but as in the present invention. Even if the curvature radius at the beginning of winding of the two flat cables 1A, 1B is designed in accordance with the minimum bending radius of the power supply flat cable 1A, the power supply flat cable 1A, which is weak against bending stress, is bent to a smaller bending radius. By winding outside the signal supply flat cable 1B that can be bent at a radius, the power supply flat cable 1A is always outside the outer circumference of the signal supply flat cable 1B compared to the signal supply flat cable 1B. It will be repeatedly bent with a considerably large bending radius, flat cable 1 for power supply So that the reliability of the relative limit number of bending times is greatly increased.
[0024]
【The invention's effect】
In the power feeding device to the moving body according to the present invention, the flat cable is composed of a plurality of flat cables divided into a power supply and a signal supply, and these flat cables are wound in layers. Even when power is supplied to a moving body that requires a conductor, power can be supplied to the moving body even in a narrow place without increasing the width of the storage box or the flat cable.
[0025]
In addition, when the signal supply flat cable is wound inside with the signal supply flat cable inside and the power supply flat cable outside, the flat cable for power supply, which is weak against repeated bending stress, is more reliable than the signal supply flat cable. Can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of an embodiment of a power feeding device to a moving body according to the present invention.
2 is a perspective view of a connecting portion between a flat cable and a power feeding harness at a winding center portion of a power feeding device to a moving body shown in FIG. 1;
FIG. 3 is a diagram showing the relationship between the number of sliding bends and the repeated bend radius of a power supply flat cable and a signal supply flat cable.
FIG. 4 is an explanatory diagram of a flat cable bending test for obtaining the relationship of FIG. 3;
5A is a plan view showing an example of a flat cable, and FIG. 5B is a cross-sectional view of FIG.
FIG. 6 is a cross-sectional view of an example of a conventional power feeding apparatus for a moving body.
FIG. 7 is a cross-sectional view of another example of a conventional power feeding device for a moving body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flat cable 1A Power supply flat cable 1B Signal supply flat cable 2 Flat conductor 3 Flat insulation coating 4 Storage box 5 Storage port 6 Terminal fixing part 7 Connection part 8 Forced guide 9 Guide part 10 Back door 11, 12 Roller 13 Body 14 Storage box 15 Terminal fixing part 16 Clock spring 17 Roller unit 18 Power supply harness 19 L-shaped bus bar 20 Connector

Claims (2)

In a power feeding device to a moving body, a flat cable connected to an electric device supported by the moving body is wound in a storage box so that the flat cable can be wound and rewound following the movement of the moving body. ,
The flat cable is composed of a plurality of flat cables divided into a power supply and a signal supply, and these flat cables are wound in an overlapping manner. The said signal supply flat cable and the said power supply flat cable are overlapped and wound with the said signal supply flat cable inside and the said power supply flat cable outside. Power supply device for moving body.

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