JP4190818B2 - Design method for connecting part of flat cable and flat cable connector and connecting part of flat cable and flat cable connector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a method for designing a connecting portion between a flat cable and a flat cable connecting fitting used in electric wiring of an electric device or an automobile, and a connecting portion between the flat cable and the flat cable connecting fitting.
[0002]
[Prior art]
  Flat cables have come to be used for electric wiring of electric devices and automobiles. As a method of connecting the flat cable, a flat cable connecting bracket having crimp pieces projecting on both sides in the width direction of the connecting plate portion is used, and each crimp piece is pierced into the flat cable at the location of the flat conductor to be connected to the flat conductor. A connection method using a so-called pierce terminal that electrically and mechanically connects the flat cable connecting metal fittings is employed by electrically connecting and bending the crimp pieces penetrating the flat cable to prevent them from being removed.
[0003]
  That is, as shown in FIG. 8, the perspective view before the connection of the flat cable connecting metal fitting 1 with the female fitting connection body and the flat cable 2 is shown. In a flat cable connecting fitting 1 with a connecting body, a connecting plate portion 4 is connected to a female fitting connecting body 3, and a plurality of crimp pieces 5 are provided on both sides of the connecting plate portion 4 in the width direction. The flat cable holding pieces 6 protrude from both ends of the end portion of the connecting plate portion 4 in the width direction. In this case, the interval between the outward faces of the crimp pieces 5 on both sides in the width direction of the end portion of the connection plate portion 4 is provided as X, and the flat cable holding pieces 6 on both sides in the width direction of the end portion of the connection plate portion 4 are provided. The interval between the outward surfaces is provided as Wi wider than X. The flat cable 2 has a structure in which a flat conductor 7 having a width Wc is covered with a flat insulating coating 8. In this flat cable 2, a trimming portion 9 is provided in the flat insulating coating 8 on the front end side of the flat conductor 7 so as to reduce the width thereof in order to be inserted into the connector housing with the flat cable connecting fitting 1 being connected. Yes.
[0004]
  When connecting the flat cable connecting bracket 1 to the flat cable 2, as shown in FIG. 9, each crimp piece 5 of the flat cable connecting bracket 1 is pierced into the flat cable 2 at the location of the flat conductor 7. The continuity is obtained and each crimp piece 5 penetrating the flat cable 2 is bent and crimped to be secured, and the flat cable holding piece 6 is folded and crimped to grasp the flat cable 2. The connection part 10 is formed.
[0005]
  As shown in FIG. 9, the flat cable connection fitting 1 connected to the flat cable 2 in this manner is accommodated and locked in the connector housing 11 in the flat cable connection fitting 1 and the connection portion 10. .
[0006]
  The purpose of crimping and holding each flat cable holding piece 6 of the flat cable connecting bracket 1 on the flat cable 2 is not only the longitudinal tensile force f1 on the flat cable 2 as shown in FIG. When external forces such as lateral tensile forces f2 and f3 are repeatedly applied, cracks such as C1, C2 and C3 are generated in the flat conductor 7, and eventually a crack between the crimp pieces 5 such as C4 and C5 is induced. This is because the structure is such that the tensile force in the lateral direction is not transmitted to the connecting portion 10 to some extent. In the connection method using the flat cable holding piece 6, the longitudinal tensile force f 1 on the flat cable 2 should be taken into consideration, so the distance X between the crimp pieces 5 on both sides in the width direction at the end of the connecting plate 4 is crimped. It is taken comparatively wide from the ease of the piercing of the piece 5 and the bending caulking.
[0007]
  In general, the flat cable 2 with the flat cable connection fitting 1 is formed by connecting a plurality of flat cable connection fittings 1 to the flat conductors 7 as shown in FIG. In this case, the ends of the flat cables 2 with the individual flat cable connection fittings 1 are separated by trimming slits 9a so that the fitting connection bodies 3 and the connection portions 10 can be accommodated in the connector housing 11.
[0008]
  Recently, as shown in FIG. 12, a flat cable 2 having a narrower width Wc of the flat conductor 7 is required. In this case, a flat cable connecting fitting 1 having a narrow width is used. As a result, the distance X between the crimp pieces 5 on both sides in the width direction of the end portion of the connection plate portion 4 in the flat cable connection fitting 1 is also narrowed. Thus, when the space | interval X of the crimp piece 5 of the both ends of the width direction of the edge part of the connection board part 4 becomes narrow, since the crimp piece 5 cannot be crimped in circular arc shape by a pair arrangement | positioning, as shown in FIG. Arranged in an alternating staggered pattern and crimped. At this time, the trimming slit 9a is much narrower than the normal one shown in FIG.
[0009]
[Problems to be solved by the invention]
  However, in the connecting portion 10 between the flat cable 2 and the flat cable connector 1 shown in FIG. 11, the structure for preventing lateral tension by the flat cable holding piece 6 pierces the crimp piece 5 into the flat cable 2, and the flat cable holding piece 6 that faces the flat cable holding piece 6. When the flat cable 2 is inserted between them, the flat conductor 7 may be damaged by the flat cable holding piece 6 because the remaining margin We of the flat insulation coating 8 is very narrow because it is trimmed by the trimming slit 9a. There was a problem. If the trimming slit 9a becomes very narrow as shown in FIG. 12, the adjacent flat cable holding pieces 6 come into contact with each other, and the flat cable 2 can be held by the flat cable holding pieces 6 well. There was a problem that disappeared.
[0010]
  An object of the present invention is to provide a flat cable which can realize a connecting portion between a flat cable and a flat cable connecting bracket having an appropriate lateral tensile strength, and which can determine the distance between the crimp pieces in the width direction of the connecting plate portion in the flat cable connecting bracket. The object of the present invention is to provide a method for designing a connection portion between a cable and a flat cable connection fitting.
[0011]
  Another object of the present invention is to provide a connecting portion between a flat cable and a flat cable connecting fitting that can realize a connecting portion between the flat cable and the flat cable connecting fitting having an appropriate lateral tensile strength.
[0012]
[Means for Solving the Problems]
  The present invention provides a flat conductor of a flat cable in which a flat conductor is covered with a flat insulation coating, and each crimp piece of a flat cable connection metal fitting in which a crimp piece protrudes on both sides in the width direction of a connection plate portion is a flat conductor. The present invention is directed to a method for designing a connecting portion between a flat cable and a flat cable connecting metal fitting, which is pierced at a position to be electrically connected to a flat conductor and each crimp piece penetrating the flat cable is bent and secured.
[0013]
  In the design method of the connecting portion of the flat cable and the flat cable connecting metal fitting according to the present invention, the width of the flat conductor is Wc, the interval between the crimp pieces in the width direction of the connecting plate portion is X, and the crimp piece pierced by the flat conductor is Y is the remaining conductor dimension from the position to the edge of the flat conductor on that side.When the expressionThe distance X between the crimp pieces in the width direction of the connecting plate portion is determined from the relationship between the longitudinal tensile strength and the lateral tensile strength of the flat cable with respect to the remaining conductor dimension Y determined by Y = (Wc−X) / 2. To do.
[0014]
  With this design, it is possible to obtain the distance X between the crimp pieces in the width direction of the connecting plate portion of the flat cable connecting bracket, which can realize a connecting portion between the flat cable and the flat cable connecting bracket having an appropriate lateral tensile strength. .
[0015]
  In this case, the remaining conductorResidual conductor dimension corresponding to the intersection of the vertical tensile strength characteristic line and the transverse tensile strength characteristic line of the flat cable with respect to dimension Y or a value in the vicinity thereofYa is obtained, and the distance X between the crimp pieces in the width direction of the connecting plate portion is determined by this Ya and the formula X = Wc−2Ya.By designing in this way, it is possible to realize a connecting portion between a flat cable and a flat cable connecting bracket having an appropriate lateral tensile strength, and each crimp piece in the width direction of the connecting plate portion in the flat cable connecting bracket.Easy interval XCan be sought.
[0016]
  Further, the present invention provides a flat cable in which a flat conductor is covered with a flat insulating coating, and a connecting portion of the flat cable connecting metal is overlapped at a portion of the flat conductor to form an overlapping portion. Two cuts are made in parallel along the longitudinal direction of the section, and the portion between the two cuts is stepped with respect to the portions on both sides intersecting the cut, and at the longitudinal end of each cut It is a design method object of a connecting portion of a flat cable and a flat cable connecting metal fitting provided with a contact portion where the flat conductor and the connecting plate portion are in electrical contact.
[0017]
  In the design method of the connecting portion between the flat cable and the flat cable connecting bracket according to the present invention, the width of the flat conductor is Wc, the interval between the two cuts is X ′, and from the position of the cut to the edge of the flat conductor on that side Y ′ is the remaining conductor size ofWhen the expression From the relationship between the longitudinal tensile strength and the lateral tensile strength of the flat cable with respect to the remaining conductor dimension Y ′ determined by Y ′ = (Wc−X ′) / 2, the interval between two cuts is determined as X ′. .
[0018]
  If designed in this way, a connecting portion between a flat cable and a flat cable connecting metal fitting having an appropriate lateral tensile strength can be realized, and an interval X ′ between two cuts in the flat cable connecting metal fitting can be obtained.
[0019]
  In this case, the remaining conductorFind the remaining conductor dimension Ya ′ or its value Ya ′ corresponding to the intersection of the characteristic line of the longitudinal tensile strength and the characteristic line of the horizontal tensile strength with respect to the dimension Y ′.The distance X ′ between the two breaks is determined by this Ya ′ and the formula X ′ = Wc−2Ya ′.With this design, it is possible to realize a connecting portion between a flat cable having an appropriate lateral tensile strength and a flat cable connecting bracket.Find X 'easilyYou can
[0020]
  Further, the present invention provides a flat conductor of a flat cable in which a flat conductor is covered with a flat insulation coating, and each crimp piece of the flat cable connecting bracket in which a crimp piece protrudes on both sides in the width direction of the connecting plate portion. The connection portion between the flat cable and the flat cable connecting metal fitting, which is pierced at the position of, is connected to the flat conductor and each crimp piece penetrating the flat cable is bent and secured.
[0021]
  In the connecting portion between the flat cable and the flat cable connecting bracket according to the present invention, the width of the flat conductor is Wc, the interval between the crimp pieces in the width direction of the connecting plate portion is X, and the position of the crimp piece stuck in the flat conductor is Y is the remaining conductor dimension up to the edge of the flat conductor on the sideWhen And the expressionThe distance X between the crimp pieces in the width direction of the connecting plate portion is determined from the relationship between the longitudinal tensile strength and the lateral tensile strength of the flat cable with respect to the remaining conductor dimension Y determined by Y = (Wc−X) / 2. Features.
[0022]
  In such a connection portion between the flat cable and the flat cable connecting bracket, since the interval X between the crimp pieces in the width direction of the connecting plate portion in the flat cable connecting bracket is an appropriate value, it has an appropriate lateral tensile strength. A connecting portion between the flat cable and the flat cable connecting bracket can be realized.
[0023]
  In this case, the distance X between the crimp pieces in the width direction of the connecting plate part is the conductor remaining dimension corresponding to the intersection of the flat cable longitudinal tensile strength characteristic line and the transverse tensile strength characteristic line with respect to the conductor remaining dimension Y or the vicinity thereof. The value of theTheYaWhen the expressionX = Wc-2YaIs set to a value determined by.like thisNaWhen the distance X between the crimp pieces in the width direction of the connection plate portion is in the value, the connection portion between the flat cable having the appropriate lateral tensile strength and the flat cable connecting bracketsimplyCan be realized.
[0024]
  Further, the present invention provides a flat cable in which a flat conductor is covered with a flat insulation coating, wherein a connecting portion of the flat cable connecting metal is overlapped at a portion of the flat conductor to form an overlapping portion. Two cuts are made in parallel along the longitudinal direction, and the portion between the two cuts is stepped with respect to both sides intersecting the cut, and a flat conductor is formed at the longitudinal end of each cut. The connection part of the flat cable and the flat cable connecting metal fitting in which the contact part which the contact plate part electrically contacted is provided is made into object.
[0025]
  In the connecting portion between the flat cable and the flat cable connecting bracket according to the present invention, the width of the flat conductor is Wc, the interval between the two cuts is X ′, and the remaining conductor dimension from the position of the cut to the edge of the flat conductor on that side Is Y 'And the expressionY ′ = (Wc−X ′) / 2ByFrom the relationship between the longitudinal tensile strength and the transverse tensile strength of the flat cable with respect to the determined conductor remaining dimension Y ′,Interval X'Is determined.
[0026]
  In such a connection portion between the flat cable and the flat cable connecting bracket, the distance X ′ between the two cuts in the flat cable connecting bracket is an appropriate value. Therefore, the flat cable and the flat cable having an appropriate lateral tensile strength can be obtained. A connection portion of the connection fitting can be obtained.
[0027]
  In this case, two breaksInterval X'Is the remaining conductor dimension corresponding to the intersection of the longitudinal tensile strength characteristic line and the transverse tensile strength characteristic line of the flat cable with respect to the remaining conductor dimension Y' or a value in the vicinity of it.Is set to a value determined by the expression X ′ = Wc−2Ya ′.. The interval X ′ between the two breaks isTo this valueOf flat cable and flat cable connection fittings with appropriate lateral tensile strength.Easy connectionCan be realized.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
  FIG. 1 is a cross-sectional view showing a first example of an embodiment of a method for designing a connecting portion between a flat cable and a flat cable connecting fitting and a connecting portion between the flat cable and the flat cable connecting fitting according to the present invention.
[0029]
  In the design method of the connecting portion of the flat cable and the flat cable connecting metal fitting in this example, the flat conductor 7 was pierced by the flat conductor 7 with the width Wc, the interval between the crimp pieces 5 in the width direction of the connecting plate portion 4 with X. When the remaining conductor dimension from the position of the crimp piece 5 to the edge of the flat conductor 7 on that side is Y,
  Y = (Wc−X) / 2
The distance X between the crimp pieces 5 in the width direction of the connecting plate portion 4 is determined from the relationship between the longitudinal tensile strength and the lateral tensile strength of the flat cable 2 with respect to the remaining conductor dimension Y determined by.
[0030]
  A specific example of the design method of the connecting portion between the flat cable and the flat cable connecting metal will be described below.
[0031]
  2 uses two types of flat cables with different insulating materials, and the flat cable connecting bracket 1 is changed from the flat cable 7 to the flat conductor 7 by changing the distance X between the crimp pieces 5 in the width direction of the connecting plate 4 in FIG. The crimped piece 5 is stabbed and the crimped piece 5 is crimped into an arc shape to form a connection portion 10, and the flat conductor 7 with respect to the remaining conductor dimension Y when the connection portion 10 is subjected to longitudinal tension and lateral tension is broken. It is a characteristic view of the experimental result which measured the tensile strength to reach.
[0032]
  In FIG. 2, A is a characteristic line of longitudinal tensile strength with respect to a connecting portion 10 between a flat cable 2 called a flat cable 2 and a flat cable connecting metal 1 called FFC insulated with a flat insulating coating 8 made of polyethylene terephthalate film, and B is also a so-called FTC. A characteristic line of lateral tensile strength with respect to the connecting portion 10 between the flat cable 2 called FFC and the flat cable connector 1, C is a flat cable 2 called so-called EFFC insulated by a flat insulating coating 8 extruded and coated with polybutylene terephthalate Characteristic line of longitudinal tensile strength with respect to the connecting part 10 with the flat cable connecting bracket 1, D indicates a characteristic line of lateral tensile strength with respect to the connecting part 10 between the flat cable 2 and the flat cable connecting bracket 1, which is also called EFFC. It is.
[0033]
  Here, the FFC uses a flat cable 2 in which the flat conductor 7 has a thickness of 0.15 mm, a width of 2.5 mm, and the flat insulating coating 8 including the adhesive layer has a thickness of 0.09 mm. EFFC has a thickness of the flat conductor 7. A flat cable 2 having a thickness of 0.15 mm, a width of 2.5 mm, and an extrusion-coated flat insulating coating 8 having a thickness of 0.17 mm is used.
[0034]
  As is apparent from FIG. 2, the longitudinal tension with respect to the connecting portion 10 has a substantially flat characteristic having a maximum value as shown by characteristic lines A and C. On the other hand, with respect to the lateral tension with respect to the connecting portion 10, a characteristic proportional to the remaining conductor dimension Y as shown by the characteristic lines B and D is shown. Further, the longitudinal and lateral tensile strengths of the EFFC connecting portion 10 are smaller than the longitudinal and lateral tensile strengths of the FFC connecting portion 10 even though the flat insulating coating 8 is thick. Yes. This is estimated to be due to the influence of the tensile strength of each insulating material.
[0035]
  Thus, by knowing the dimensions of the flat conductor 7 to be used and the similar characteristics of the material of the flat insulation coating 8 to the flat cable 2, for example, the intersection of the characteristic lines A and B in FIG. The conductor remaining dimension with respect to the intersection or the value Ya in the vicinity thereof is obtained, and the interval X between the crimp pieces 5 in the width direction of the connecting plate portion 4 is determined as follows:
  X = Wc-2Ya
Further, by designing the flat cable connecting bracket 1, the connecting portion 10 between the flat cable connecting bracket 1 and the flat cable 2 that cannot use the flat cable holding piece 6 described above can be used for both longitudinal and lateral tension. The most suitable flat cable fitting 1 can be used.
[0036]
  Although the flat cable connection fitting 1 used in the above example has been described with respect to the flat cable connection fitting 1 having the fitting connection body 3, the present invention is not limited thereto. Of course, the flat cable connecting bracket 1 is provided across the butted portions of the flat cable 2 by using the flat cable connecting bracket 1 in which a plurality of crimp pieces 5 protrude from both sides of the connecting plate portion 4 in the width direction. The crimp piece 5 is inserted into the flat cable 2 on the corresponding side at the flat conductor 7, and the crimp piece 5 penetrating the flat cable 2 is bent into an arc shape and crimped. The same applies to the unit 10 as well.
[0037]
  3 to 7 show a second example of the embodiment of the design method of the connecting portion between the flat cable and the flat cable connecting bracket and the connecting portion between the flat cable and the flat cable connecting bracket according to the present invention. Is a perspective view of the connecting portion of the flat cable and the flat cable connecting bracket of this example, FIG. 4 is a plan view of the main portion of the connecting portion of the flat cable and the flat cable connecting bracket of this example, FIG. 6 is a cross-sectional view taken along line BB in FIG. 4, and FIG. 7 is a cross-sectional view taken along line CC in FIG.
[0038]
  In this example, as shown in FIG. 3, a flat cable connecting metal 1 having a structure in which a connection plate portion 4 is connected to a fitting connection body 3 is used.
[0039]
  A portion of the flat conductor 7 of the flat cable 2 is overlapped with the connecting plate portion 4 of the flat cable connecting bracket 1 to form an overlapping portion 12, and the overlapping portion 12 is parallel to the longitudinal direction of the connecting plate portion 4. Two cuts 13 are put in, and a portion 14a between the two cuts 13 is stepped with respect to the portions 14b on both sides intersecting the cut 13, and the longitudinal ends of each cut 13 are shown in FIG. As shown, the design method of the connecting portion 10 ′ of the flat cable 2 and the flat cable connecting fitting 1 provided with the contact portion 15 where the flat conductor 7 and the connecting plate portion 4 are in electrical contact, and the flat cable 2 and the flat cable connecting fitting. The present invention can be applied to one connecting portion 10 'as follows.
[0040]
  That is, in the design method of the connecting portion 10 ′ of the flat cable 2 and the flat cable connecting bracket 1, as shown in FIG.
  When the width of the flat conductor is Wc, the interval between the two cuts 13 is X ′, and the remaining conductor dimension from the position of the cut 13 to the edge of the flat conductor 7 on that side is Y ′,
  Y ′ = (Wc−X ′) / 2
From the relationship between the longitudinal tensile strength and the lateral tensile strength of the flat cable 2 with respect to the remaining conductor dimension Y ′ determined by the following equation, the distance X ′ between the two cuts 13 is determined.
[0041]
  The distance X ′ between the two cuts 13 is the remaining conductor dimension Ya ′ corresponding to the intersection of the longitudinal tensile strength characteristic line and the transverse tensile strength characteristic line of the flat cable 2 with respect to the remaining conductor dimension Y ′ or a value Ya ′ in the vicinity thereof. In search of
  X ′ = Wc−2Ya ′
Ask more.
[0042]
  Even if it does in this way, the same effect as the 1st example can be acquired.
[0043]
【The invention's effect】
  Claim 1In the design method of the connecting portion of the flat cable and the flat cable connecting bracket according to the invention, the width of the flat conductor is Wc, the interval between the crimp pieces in the width direction of the connecting plate portion is X, and the position of the crimp piece stuck into the flat conductor When the remaining conductor dimension from the edge of the flat conductor to that side is YIn, Y = (Wc−X) / 2According to the formulaSince the distance X between the crimp pieces in the width direction of the connecting plate portion is determined from the relationship between the longitudinal tensile strength and the transverse tensile strength of the flat conductor remaining dimension Y, the flat cable and the flat cable having an appropriate transverse tensile strength are determined. The space | interval X of each crimp piece of the width direction of the connection board part in a flat cable connection metal fitting which can implement | achieve the connection part of a connection metal fitting can be calculated | required.
[0044]
  Especially in the present invention,Obtain the conductor residual dimension corresponding to the intersection of the characteristic line of the longitudinal tensile strength and the characteristic line of the lateral tensile strength with respect to the conductor residual dimension Y or a value Ya in the vicinity thereof,Since the distance X between the crimp pieces in the width direction of the connecting plate portion is obtained from the equation X = Wc−2Ya., The distance between each crimp piece in the width direction of the connecting plate in the flat cable connector can realize the connection part of the flat cable and the flat cable connector with appropriate lateral tensile strengthX is easyCan be sought.
[0045]
  Claimed in claim 2In the design method of the connecting portion between the flat cable and the flat cable connecting bracket according to the invention, the width of the flat conductor is Wc, the interval between the two cuts is X ′, and the distance from the cut to the edge of the flat conductor on that side When the remaining conductor dimension is Y 'In, Y ′ = (Wc−X ′) / 2According to the formulaSince the distance between the two cuts is determined from the relationship between the longitudinal tensile strength and the lateral tensile strength of the flat cable with respect to the determined conductor remaining dimension Y ′, the flat cable having the appropriate lateral tensile strength and the flat cable connecting bracket X 'can be calculated | required for the space | interval of the 2 cut | interruption in a flat cable connection metal fitting which can implement | achieve a connection part.
[0046]
  In this case, the remaining conductor dimension Ya ′ corresponding to the intersection of the characteristic line of the longitudinal tensile strength and the transverse tensile strength of the flat cable with respect to the remaining conductor dimension Y ′ or a value Ya ′ in the vicinity thereof is obtained, and X ′ = Wc−2Ya ´The distance X ′ between two cuts isAskBecauseThe distance between the two cuts can be obtained very easily, which can realize a connecting portion between a flat cable having an appropriate lateral tensile strength and a flat cable connector.
[0047]
  Also,Claimed in claim 3In the connection part of the flat cable and the flat cable connecting bracket according to the invention, the flat conductorWith width Wc, The distance between each crimp piece in the width direction of the connecting plateX and,formulaY = (Wc−X) / 2BySince the distance X between the crimp pieces in the width direction of the connecting plate portion is determined from the relationship between the longitudinal tensile strength and lateral tensile strength of the flat cable with respect to the determined conductor remaining dimension Y, the width of the connecting plate portion in the flat cable connecting bracket is determined. The space | interval X of each crimp piece of a direction becomes an appropriate value, and the connection part of the flat cable and flat cable connecting metal fitting which has appropriate lateral tensile strength is realizable.
[0048]
  in this case,The distance X between the crimp pieces in the width direction of the connecting plate portion is:Residual conductor dimension corresponding to the intersection of the vertical tensile strength characteristic line and the transverse tensile strength characteristic line with respect to the remaining conductor dimension YTheWhen YaIn addition,X = Wc-2YaIs set to a value determined by the formulaOf flat cables and flat cable fittings with appropriate lateral tensile strengthEasy connectionCan be realized.
[0049]
  Also,Claimed in claim 4In the connecting portion between the flat cable and the flat cable connecting bracket according to the invention, the width of the flat conductor is Wc, the interval between the two cuts is X ′, and the conductor remaining dimension from the position of the cut to the edge of the flat conductor on that side is When Y ′, Y ′ = (Wc−X ′) / 2According to the formulaFrom the relationship between the longitudinal tensile strength and the transverse tensile strength of the flat cable with respect to the determined conductor remaining dimension Y ′,Interval XSince 'is determined, the distance X' between the two cuts in the flat cable fittingTheAppropriateAs valueThus, it is possible to obtain a connection portion between the flat cable and the flat cable connecting metal fitting having an appropriate lateral tensile strength.
[0050]
  in this caseThe interval X ′ between the two breaks isThe remaining conductor dimension corresponding to the intersection of the longitudinal tensile strength characteristic line and the transverse tensile strength characteristic line of the flat cable with respect to the remaining conductor dimension Y ′ or a value in the vicinity thereof is represented by Ya ′.And whenX ′ = Wc−2Ya ′Is set to a value determined byOf flat cables and flat cable fittings with appropriate lateral tensile strengthEasy connectionCan be realized.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a connecting method in a first example of an embodiment of a connecting method between a flat cable and a flat cable connecting bracket and a connecting portion between the flat cable and the flat cable connecting bracket according to the present invention. It is.
[Fig. 2] An experiment in which the tensile strength at which the flat conductor breaks relative to the remaining conductor dimensions when vertical tension and lateral tension are applied to the connecting part where the flat cable connecting bracket is connected to two types of flat cables with different insulating materials It is a characteristic figure of a result.
FIG. 3 shows a design method of a connecting portion between a flat cable and a flat cable connecting bracket and a flat cable and a flat cable connecting bracket according to a second example of the embodiment of the connecting portion between the flat cable and the flat cable connecting bracket. It is a perspective view of a connection part.
FIG. 4 is a plan view of a main part of a connecting portion between a flat cable and a flat cable connecting metal fitting according to a second example of the embodiment;
FIG. 5 is a cross-sectional view taken along line AA in FIG.
6 is a cross-sectional view taken along line BB in FIG.
7 is a cross-sectional view taken along line CC in FIG.
FIG. 8 is a perspective view of a state before connection of a conventional flat cable and a flat cable connecting bracket.
FIG. 9 is a perspective view of a state where a flat cable connecting metal part at the tip of a conventional flat cable with a flat cable connecting metal is stored in a connector housing.
FIG. 10 is a perspective view showing a state in which a flat conductor is cracked by a tensile force acting in a vertical direction and a horizontal direction at a connection portion between a conventional flat cable connecting bracket and a flat cable.
FIG. 11 is a perspective view showing a state in which a flat cable connecting metal fitting is connected to a tip end portion of each flat conductor of a conventional flat cable having a multi-core normal width flat conductor.
FIG. 12 is a perspective view showing a state in which a flat cable connecting metal fitting is connected to a tip end portion of each flat conductor of a flat cable having a conventional multi-core narrow flat conductor.
[Explanation of symbols]
  1 Flat cable connection bracket
  2 Flat cable
  3 Mating connector
  4 Connection plate
  6 Flat cable holding piece
  7 Flat conductor
  8 Flat insulation coating
  9 Trimming section
  9a Trimming slit
  10, 10 'connection
  11 Connector housing
  12 Superposition part
  13 breaks
  14a The part between the cuts
  14b Parts on both sides that intersect the cut
  15 Contact area

Claims (4)

The flat conductor of the flat cable in which the flat conductor is coated on the flat conductor, and the crimp pieces projecting on both sides in the width direction of the connecting plate portion, the crimp pieces of the flat cable connecting bracket are positioned on the flat conductor. In the design method of the connection portion between the flat cable and the flat cable connecting bracket, the crimp pieces that are pierced with the flat conductor are taken, and the crimp pieces that penetrate the flat cable are bent and secured.
The width of the flat conductor is Wc, the distance between the crimp pieces in the width direction of the connecting plate portion is X, and the conductor from the position of the crimp piece pierced by the flat conductor to the edge of the flat conductor on that side The conductor corresponding to the intersection of the characteristic line of the vertical tensile strength and the characteristic line of the transverse tensile strength with respect to the remaining conductor dimension Y determined by the formula Y = (Wc−X) / 2, where Y is the remaining dimension. A flat cable and a flat cable connecting metal fitting characterized in that a remaining dimension or a value Ya in the vicinity thereof is obtained, and an interval X between the crimp pieces in the width direction of the connecting plate portion is determined by the formula X = Wc−2Ya . How to design the connection.   A flat cable having a flat conductor covered with a flat insulation coating is overlapped with a connecting plate portion of a flat cable connecting bracket at the flat conductor to form an overlapping portion, and the overlapping portion forms a longitudinal portion of the connecting plate portion. Two cuts are made in parallel along the direction, and the portion between the two cuts is stepped with respect to both sides intersecting the cut, and the longitudinal ends of the cuts are In the design method of the connecting portion of the flat cable and the flat cable connecting bracket provided with a contact portion where the flat conductor and the connecting plate portion are in electrical contact,
When the width of the flat conductor is Wc, the interval between the two cuts is X ′, and the remaining conductor dimension from the position of the cut to the edge of the flat conductor on that side is Y ′, the formula Y ′ = The conductor residual dimension corresponding to the intersection of the characteristic line of the vertical tensile strength and the characteristic line of the lateral tensile strength with respect to the residual conductor dimension Y ′ determined by (Wc−X ′) / 2 or the value Ya ′ in the vicinity thereof corresponding to the intersection of the characteristic line of the transverse tensile strength and the transverse tensile strength. A method for designing a connecting portion between a flat cable and a flat cable connecting metal fitting, wherein the distance X ′ between the two cuts is determined by the formula X ′ = Wc−2Ya ′. The flat conductor of the flat cable in which the flat conductor is coated with the flat conductor, and the crimp pieces projecting on both sides in the width direction of the connecting plate portion. In the connecting portion of the flat cable and the flat cable connection bracket, the crimp piece that is pierced with the flat conductor is taken, and each crimp piece that penetrates the flat cable is bent and secured.
The crimp piece pierced by the flat conductor has a dimension Y determined by the width Wc of the flat conductor, the distance X between the crimp pieces in the width direction of the connecting plate portion, and the formula Y = (Wc−X) / 2. Conductor remaining dimension from the position of the flat conductor to the edge of the flat conductor on that side, and the conductor remaining dimension corresponding to the intersection of the characteristic line of the longitudinal tensile strength and the characteristic line of the transverse tensile strength of the flat cable with respect to the conductor remaining dimension Y Or when the value in the vicinity is Ya,
The interval X between the crimp pieces in the width direction of the connecting plate portion is a value determined by the formula X = Wc−2Ya,
The connection part of the flat cable and the flat cable connection bracket characterized by A flat cable having a flat conductor covered with a flat insulation coating is overlapped with a connecting plate portion of a flat cable connecting bracket at the flat conductor to form an overlapping portion, and the overlapping portion forms a longitudinal portion of the connecting plate portion. Two cuts are made in parallel along the direction, and the portion between the two cuts is stepped with respect to both sides intersecting the cut, and the longitudinal ends of the cuts are Connection between a flat cable and a flat cable connecting bracket provided with a contact portion where the flat conductor and the connecting plate portion are in electrical contact with each other In the department
The dimension Y ′ determined by the width Wc of the flat conductor, the distance X ′ between the two cuts, and the formula Y ′ = (Wc−X ′) / 2 is set to the edge of the flat conductor on the side from the cut position. The remaining conductor dimension up to the portion, and the remaining conductor dimension corresponding to the intersection of the longitudinal tensile strength characteristic line and the transverse tensile strength characteristic line of the flat cable with respect to the remaining conductor dimension Y ′ or a value in the vicinity thereof is defined as Ya ′. sometimes,
The interval X ′ between the two cuts is a value determined by the formula X ′ = Wc−2Ya ′,
The connection part of the flat cable and the flat cable connection bracket characterized by

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