KR20160011041A - Flexible flat cable conductor for steering roll connector and method thereof - Google Patents

Abstract

The present invention relates to a flexible flat cable conductor for a steering roll connector (SRC), a method for producing the same, and a flexible flat cable produced thereby. More specifically, the present invention relates to a flexible flat cable conductor for an SRC, a method for producing the same, and a flexible flat cable produced thereby, wherein a conductor to be applied to a flexible flat cable for an SRC is made to have thickness and elongation optimized through a rolling and heating process, so high durability is ensured in the flexible flat cable conductor for an SRC. Therefore, disconnection of the conductor of a flat cable and an electric terminal connected thereto may be prevented through flexibility improved even in a high temperature/high humid area.

Description

Technical Field [0001] The present invention relates to a flexible flat cable conductor for SRC, a method of manufacturing the flexible flat cable conductor, and a flexible flat cable conductor for the SRC,

The present invention relates to a flexible flat cable conductor for SRC, a manufacturing method thereof, and a flexible flat cable produced thereby. More particularly, the present invention relates to a flexible flat cable conductor for SRC, And the elongation (elongation) of the flat cable, thereby ensuring the high durability of the flexible flat cable conductor for SRC, thereby improving the flexibility of the flat cable conductor and the electric terminal To a flexible flat cable conductor for SRC capable of preventing disconnection, a manufacturing method thereof, and a flexible flat cable produced thereby.

Generally, an automotive steering wheel assembly largely consists of a steering wheel, a steering column, a steering roll connector (SRC) assembly, and a multifunction switch assembly.

The steering wheel changes the turning direction when the driver changes the direction of the vehicle. The steering wheel is coupled to the steering column so that the steering wheel operating force of the driver is transmitted through the rack and the pinion to drive the wheels.

The multi-function switch assembly controls various functions of the vehicle, and is installed at a position where the driver can easily use the multi-function switch.

For example, a typical automobile is provided with a window switch for opening and closing a window, a light switch for turning on / off the light, a wiper switch for driving the wiper, and an audio switch for controlling audio, The light switch and the wiper switch are installed mainly on the lower side of the automobile steering wheel, and the audio switch is installed mainly on the inner front side of the automobile or on the top side of the steering wheel of the automobile.

Recently, a cruise switch for controlling the cruising speed of a car is provided. Such a cruise switch is also installed mainly on the lower side of a car steering wheel, such as a light switch and a wiper switch.

A multifunction switch assembly is mounted on the lower side of the steering wheel of the vehicle so as to simplify implementation of the lower portion of the steering wheel.

At this time, an airbag provided on the upper surface of the steering wheel and a steering roll connector for supplying power to the multi-function switch assembly are indispensably provided below the vehicle steering wheel for safety of the driver.

The steering roller connector has a flat cable inside and has a structure in which the cable rotates along the radius when the steering wheel rotates.

1 is a schematic exploded perspective view of a steering roll connector assembly of a conventional automobile.

As shown in FIG. 1, a steering wheel connector assembly of a conventional automobile comprises a flat cable 20 ', a stator 12', 13 ', and a rotator 15'.

The flat cable 20 'includes a plurality of conductors made of copper. The plurality of conductors are covered with an insulator film. The ends of the flat cable 20 'are fixed to the stator 12', 13 '. The flat cable 20 'exchanges electrical signals with the stator 12', 13 '. For this function, the flat cable 20 'is provided with a plurality of electrical terminals extending from a plurality of conductors exposed at the ends. The plurality of electrical terminals are joined to a component called a mold frame by ultrasonic welding or soldering. The mold frame includes a connector device electrically connected to the electrical terminal.

However, the flat cable 20 'is always in the state of receiving an external force because it is interlocked with the steering device of the vehicle, that is, the steering column. In the high temperature and high humidity region, the durability and flexibility of the conductor of the flat cable 20' So that the conductor of the flat cable 20 'and the electric terminal connected thereto can be peeled off, resulting in breakage.

When the conductor and the electric terminal are disconnected, the airbag of the vehicle, which is a very important device for the safety of the passenger, is inoperable, which may cause a serious danger to the safety of the passenger.

Korean Registered Utility Model No. 20-0444729 (Registered May 26, 2009)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide an SRC flexible flat cable which is rolled and heat-treated to have a thickness of 0.022 to 0.032 mm and an elongation of 15% to 30% The present invention relates to a flexible flat cable conductor for SRC which is capable of securing high durability and flexibility even in a high-temperature / high-humidity region and preventing a conductor of a flat cable and an electric terminal connected thereto from being disconnected, And to provide a manufactured flexible flat cable.

It is another object of the present invention to provide a flexible flat cable conductor for SRC capable of obtaining more completely optimized thickness and elongation by secondarily rolling and heat treating a conductor for application to a flexible flat cable, To provide a flexible flat cable produced by the method.

In order to achieve the above-mentioned objects, the SRC flexible flat cable conductor according to the present invention has a thickness of 0.022 to 0.032 mm.

Here, it is preferable that the elongation (elongation) of the conductor is 15% to 30%.

Further, it is preferable that the conductor has a thickness of 0.022 to 0.032 mm through secondary rolling.

Further, the rolling may be cold rolling.

Further, it is preferable that the conductor is heat-treated at 300 ° C to 400 ° C over a second time.

According to another aspect of the present invention, there is provided a method of manufacturing a flexible flat cable conductor for SRC, comprising: rolling a conductor to a thickness of 0.022 mm to 0.032 mm; And heat treating the rolled conductor at 300 ° C to 400 ° C.

Wherein the rolling step comprises: a primary rolling step in which the conductor is rolled to 105% to 115% of the thickness; And a second rolling step of further rolling the conductor firstly rolled to 105% to 115% of the thickness in the first rolling step to a remaining 5% to 15% and thickness of the conductor.

In addition, the heat treatment step may include: a first heat treatment step of performing a first heat treatment on the first rolled conductor through the first rolling step; And a second heat treatment step of performing second heat treatment on the secondarily rolled conductor through the second rolling step.

In addition, the heat treatment step may preferably heat the rolled conductor by adjusting the voltage and the current.

In addition, it is preferable that the voltage to be adjusted in the primary heat treatment step is 4.6V to 5.3V, the current is in the range of 2A to 60A, the voltage to be adjusted in the secondary heat treatment step is 8.5V to 15V, and the current is in the range of 2A to 60A.

Further, it is preferable that the elongation of the conductor is 15% to 30% by the heat treatment.

In order to achieve the above object, an SRC flexible flat cable includes: a plurality of SRC flexible flat cable conductors spaced apart from each other; An insulator film covering each of the SRC flexible flat cable conductors; And an adhesive filling a space between the insulator film and the flexible flat cable conductor for SRC, wherein the thickness of the insulator film is 25 to 50 탆, the thickness of the adhesive is 20 to 47 탆, 45 to 85 占 퐉.

According to the flexible flat cable conductor for SRC according to the present invention, the method for manufacturing the same, and the flexible flat cable produced by the method, the conductor for application to the flexible flat cable for SRC is rolled and heat- mm and a elongation of 15% to 30%, it is possible to secure high durability and flexibility even in a high-temperature / high-humidity region, thereby preventing disconnection of the flat cable.

Further, the conductor for applying to the flexible flat cable is rolled and heat-treated in a second step, thereby achieving a more completely optimized thickness and elongation.

In addition, the size and physical properties of the flexible flat cable conductor are controlled through the rolling process, and then the reduced ductility (elongation) is recovered through the rolling process through the heat treatment process.

Also, the ductility is restored through the heat treatment process, thereby improving the bending stress and the fatigue characteristic portion of the conductor and also relaxing the internal residual stress.

1 is a schematic exploded perspective view of a steering roll connector assembly of a conventional automobile.
2A is a schematic perspective view of a flat cable to which a flexible flat cable conductor for SRC according to an embodiment of the present invention is applied.
2B is a cross-sectional view of the flat cable of FIG. 2A.
3 is a process diagram schematically showing a manufacturing process using an apparatus for manufacturing a flexible flat cable conductor for SRC according to an embodiment of the present invention.
4 is a table showing an example of a test result according to the thickness and the elongation of the SRC flexible flat cable conductor.

The present invention may be embodied in many other forms without departing from its spirit or essential characteristics. Accordingly, the embodiments of the present invention are to be considered in all respects as merely illustrative and not restrictive.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms.

The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", "having", and the like are intended to specify the presence of stated features, integers, steps, operations, components, Steps, operations, elements, components, or combinations of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

FIG. 2A is a schematic perspective view of a flat cable to which a flexible flat cable conductor for SRC according to an embodiment of the present invention is applied, and FIG. 2B is a sectional view of the flat cable of FIG.

2A and 2B, the flat cable 10 is inserted into an annular receiving space formed by the stator 12 ', 13' (see FIG. 1) and the rotator 15 '(see FIG. 1) And is wound and installed. The end of the flat cable 10 is electrically connected to a mating part.

To be more specific, the flat cable 10 has a plurality of elongated flexible flat cable conductors 1 for SRC according to the present invention, which are electrically conductors.

Here, a plurality of SRC flexible flat cable conductors 1 included in the flat cable 10 are arranged in an insulated state from each other. The SRC flexible flat cable conductor 1 is covered with an insulator film 11 in an upper and a lower direction. Of course, the space between the insulator film 11 and the flexible flat cable conductor 1 for SRC is filled with an adhesive 12.

A flexible material such as synthetic resin (PET) is used as a material of the insulator film 11 covering the flexible flat cable conductor 1 for SRC.

A plurality of SRC flexible flat cable conductors 1 are extended to the outside to be connected to the terminals (not shown) of the counterparts at the end of the flat cable 10.

It is to be understood that the flexible flat cable conductor 1 for SRC according to an embodiment of the present invention has a vertical thickness t of 0.022 to 0.032 mm (most preferably 0.028 mm) and an elongation of 15 to 30% .

This makes it possible to provide a flexible flat cable conductor 1 for SRC having flexibility so as to prevent disconnection of conductors in high temperature and high humidity regions.

The total thickness of the flat cable 10 is about 45 to 85 μm when the thickness of the insulator film 11 is 25 to 50 μm and the thickness of the adhesive 12 is 20 to 47 μm. .

3 is a process diagram schematically showing a manufacturing process using an apparatus for manufacturing a flexible flat cable conductor for SRC according to an embodiment of the present invention.

3, an apparatus 100 for manufacturing a flexible flat cable conductor for SRC according to an embodiment of the present invention includes a wire drawing machine (wire drawing machine) for finely reducing the diameter of the conductor wire 2 110); A primary rolled portion 120 for primary rolling the fine conductor wire 2 passed through the drawing machine 110; A primary heat treatment unit 130 for primary heat treatment of the conductor wire 2 rolled through the primary rolling unit 120; A secondary rolling unit 140 for secondary rolling the conductor wire 2 subjected to the primary heat treatment through the primary heat treatment unit 130; A secondary heat treatment unit 150 for secondary heat treatment of the conductor wire 2 rolled through the secondary rolling unit 140; And a winding unit 160 for winding the completed SRC flexible flat cable conductor 1 through the secondary heat treatment unit 150.

First, in the above-described drawer 110, the diameter of the conductor wire 2 having a considerable thickness is finely reduced.

Such a drawing machine 110 is, for example, in the form of dies, and when the conductor wire 2 made of copper passes through it, the diameter thereof is gradually reduced to a desired size. Since the drawing machine 110 has a well-known structure, a further detailed description will be omitted.

Next, in the primary rolling section 120, the fine conductor wire 2 having passed through the drawing machine 110 is primarily rolled by using a rolling machine (not numbered).

Here, the primary rolled portion 120 is rolled to a thickness of, for example, about 0.05 to about 115% of 0.028 mm, for example, the thickness of the SRC flexible flat cable conductor 1, which is the final product, , And its width can be rolled to about 1.38 mm.

The primary rolled portion 120 is rolled at room temperature without heating the conductor wire 2 by adopting a known cold rolling method. As described above, by cold rolling, there is an advantage that the dimension of the conductor wire 2 becomes accurate and the mechanical properties (strength increase) are also improved.

Subsequently, in the above-described first heat treatment section 130, the conductor wire 2 primarily rolled through the primary rolled section 120 is first heat treated to have a desired primary elongation.

Here, it is preferable that the elongation rate through the first heat treatment unit 130 can be recovered to a range close to 15 to 30%, which is a desired elongation, but it is preferable that the SRC flexible flat cable conductor 1 It will have a perfect elongation of 15-30%.

Here, the primary heat treatment unit 130 performs heat treatment on the primary conductor wire 2 by adjusting voltage and current.

That is, the heat treatment is performed by adjusting the voltage and current amount flowing in the conductor line 2 by Joule's law (cal cal = 0.24 * P (power) * T (time)).

Here, the adjusted voltage and current values may be somewhat fluid depending on the cross-sectional area of the conductor wire 2. However, the voltage is adjusted to a range of 4.6 V to 5.3 V and the current is adjusted to a range of 2 A to 60 A, Heat treatment is preferred.

Next, in the secondary rolling section 140, the conductor wire 2 subjected to the first heat treatment in the primary heat treatment section 130 is secondarily rolled by using a rolling machine (not numbered).

The secondary rolled portion 140 is further subjected to 5% to 15% further rolling at the primary rolled portion 120 for SRC flexible flat cable conductor 1 which is first rolled to about 105% to 115% So that the thickness is finally the most preferable 0.028 mm and the width thereof can be rolled to about 1.2 mm.

Of course, the secondary rolling section 140 also rolls on the conductor wire 2 by adopting a known cold rolling method as described above.

Subsequently, in the above-described secondary heat treatment unit 150, the conductor wire 2 which has been secondarily rolled through the secondary rolling unit 140 is subjected to a second heat treatment so as to have a desired secondary elongation.

As described above, the SRC flexible flat cable conductor 1 has a desired elongation of 15 to 30% by two heat treatments through the primary heat treatment unit 130 and the secondary heat treatment unit 150.

Of course, as described in the above-described first heat treatment section 130, the voltage and current are adjusted to heat the secondary conductor wire 2.

That is, as described above, the heat treatment is performed by adjusting the voltage and current amount flowing in the conductor line 2 by Joule's law (cal cal = 0.24 * P (power) * T (time)).

Here, the adjusted voltage and current values may be somewhat fluidic depending on the cross-sectional area of the conductor wire 2. However, the voltage and current values may be adjusted to a range of 8.6V to 153V and a current range of 2A to 60A, .

Finally, in the winding unit 160 described above, a flexible SRC for SRC having a thickness of 0.022 to 0.032 mm (most preferably 0.028 mm) completed through the secondary heat treatment unit 150 and an elongation of 15 to 30% The flat cable conductor 1 is wound to complete the final product, which can be applied to the flat cable 10 to which the SRC flexible flat cable conductor is applied.

4 is a table showing an example of a test result according to the thickness and the elongation of the SRC flexible flat cable conductor.

As shown in FIG. 4, 23 samples in total were subjected to a change in resistance value at a high temperature of 85 DEG C and a humidity of 95% under different conditions, such as thickness and elongation of a conductor, thickness of an insulation film and thickness of a flexible flat cable It was found that only the samples (# 15 to # 18) having a thickness of 0.022 to 0.032 mm and an elongation of 15 to 30% of the SRC flexible flat cable conductor 1 passed the test result , And the remaining samples out of the range of 0.022-0.032 mm and elongation of 15-30% were found to be inadequate for reasons such as resistance increase.

The present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

1: Flexible flat cable conductor for SRC
2: Conductor wire 10: Flat cable
11: Insulator film 12: Adhesive
100: Manufacturing device for flexible flat cable conductor for SRC
110: Drawing machine 120: Primary rolling section
130: primary heat treatment section 140: secondary rolling section
150: second heat treatment section 160: winding section

Claims (11)

Flexible flat cable conductors for SRC with a thickness of 0.022 to 0.032 mm and elongation (elongation) of 15% to 30%.
The method according to claim 1,
Wherein the conductor has a thickness of 0.022 to 0.032 mm through secondary rolling.
3. The method of claim 2,
Wherein said rolling is cold-rolled.
The method according to claim 1,
Wherein the conductor is thermally treated at 300 ° C to 400 ° C over a second time.
A method of manufacturing a flexible flat cable conductor for SRC,
Rolling the conductor to a thickness of 0.022 to 0.032 mm; And
And thermally treating the rolled conductor at 300 ° C to 400 ° C.
6. The method of claim 5,
Wherein the rolling step comprises:
A primary rolling step in which the conductor is rolled to 105% to 115% of the thickness; And
Wherein the conductor is first rolled to a thickness of 105% to 115% of the thickness in the primary rolling step.
The method according to claim 6,
Wherein the heat treatment step comprises:
A first heat treatment step of performing a first heat treatment on the first rolled conductor through the first rolling step; And
And a second heat treatment step of performing a second heat treatment on the secondarily rolled conductor through the second rolling step. The method of manufacturing a flexible flat cable conductor for SRC according to claim 1,
8. The method of claim 7,
Wherein the annealing step comprises heat treating the rolled conductor by adjusting voltage and current. ≪ RTI ID = 0.0 > 15. < / RTI >
9. The method of claim 8,
Wherein the voltage controlled in the primary heat treatment step is 4.6 V to 5.3 V and the current is in the range of 2A to 60 A and the voltage controlled in the secondary heat treatment step is 8.5 to 15 V and the current is in the range of 2 to 60 A. Method of manufacturing a flexible flat cable conductor.
10. The method according to any one of claims 5 to 9,
Wherein the conductor is elongated by 15% to 30% by the heat treatment.
A flexible flat cable conductor for the SRC manufactured according to claim 5, wherein the SRC flexible cable conductor is formed in a plurality of long and long spaces;
An insulator film covering each of the SRC flexible flat cable conductors; And
And an adhesive filling a space between the insulator film and the SRC flexible flat cable conductor,
Wherein the thickness of the insulator film is 25 to 50 占 퐉, the thickness of the adhesive is 20 to 47 占 퐉, and the total thickness is 45 to 85 占 퐉.

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