JP4190810B2 - 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 design method for a connection portion between a flat cable and a flat cable connection fitting, and a connection portion between the flat cable and the flat cable connection fitting according to this design method.
[0002]
[Prior art]
A flat cable in which a flat conductor is covered with a flat insulating coating has been used for electric wiring of electric devices and automobiles. The flat cable is connected to the flat conductor by piercing each crimp piece of the flat cable connecting bracket having a structure in which a plurality of crimp pieces are erected on both sides in the width direction of the connecting plate at the flat conductor. Conduction is performed by bending and crimping each crimp piece penetrating the flat cable.
[0003]
As a form of connection, a flat cable connection fitting with a male or female fitting connection body, a plurality of crimp pieces standing on both sides in the width direction of the connection plate portion, and the flat conductor on the flat cable Connect the flat cable connection brackets that have been pierced and connected at the position of the position as described above, and the flat cable connection brackets with a plurality of crimp pieces standing on both sides in the width direction of the connection plate to the mutual flat cables to be connected. As described above, there is a structure in which it is pierced and connected at the position of the flat conductor.
[0004]
The flat cables used for these connections have become increasingly dense in recent years, and the flat conductor has a very narrow width of about 0.15 mm and a width of about 1.5 to 2.5 mm, and a thin thickness.
[0005]
FIG. 5 shows a perspective view of the flat cable connection fitting 1 with the female fitting connection body and the flat cable 2 before connection. 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. It has a structure. The flat cable 2 has a structure in which a flat conductor 6 is covered with a flat insulating coating 7. In this flat cable 2, a trimming portion 8 is provided on the flat insulating coating 7 on the front end side of the flat conductor 6 so as to narrow the width in order to be inserted into the connector housing with the flat cable connecting fitting 1 being connected. Yes.
[0006]
When connecting the flat cable connecting bracket 1 to the flat cable 2, for example, as shown in FIG. 6, a crimp piece bending caulking recess in which an arc-shaped recess is connected to the surface of a receiving bracket 9 for receiving the flat cable 2. 10 is used. The flat cable 2 is disposed on the metal fitting 9 so that the flat conductor 6 exists across the width direction on the crimp piece bending caulking recess 10. Further, the flat cable connection fitting 1 is arranged so that the crimp pieces 5 on both sides exist downward within the width of the flat conductor 6, and the flat cable connection fitting 1 is arranged above the flat cable 2. In this state, while guiding both sides of the flat cable connecting metal 1 with the guide member 11, the connecting plate portion 4 is pressed with the anvil 12 to pierce each crimp piece 5, thereby electrically connecting the flat conductor 6 and each crimp piece 5. As shown in FIG. 7, each crimp piece 5 that has penetrated through the flat cable 2 is bent and crimped by the curved surface of the crimp piece bending caulking recess 10 by further pressurization of the anvil 12. At this time, when the crimp pieces 5 are pierced into the flat conductors 6, the tear edges 6 a of the flat conductors 6 extending along the inner side surfaces of the crimp pieces 5 on both sides are bent caulking portions of the crimp pieces 5. Pressurized with an electrically stable connection.
[0007]
FIG. 8 is a plan view of the connecting portion 13 in which the flat cable connecting fitting 1 is connected to the flat cable 2 in this way.
[0008]
As shown in FIG. 9, the flat cable 2 with the flat cable connection fitting 1 has the flat cable connection fitting 1 and the connection portion 13 accommodated and locked in a connector housing 14.
[0009]
In the above, the structure in which the flat cable connecting metal 1 and the flat cable 2 are connected to each other on the end side of the flat cable 2 having the single flat conductor 6 has been described. A flat cable 2 in which conductors 6 are collectively covered with a flat insulating coating 7 is used. In this case, the flat cable connecting fittings 1 are respectively connected to end portions of these flat conductors 6 in the same manner. .
[0010]
In such a connection portion 13 between the flat cable connection fitting 1 and the flat cable 2, as shown in FIGS. 7 and 8, the piercing interval in the connecting plate portion width direction of the two rows of crimp pieces 5 piercing the flat conductor 6 Wx is made as wide as possible without impairing the puncture into the flat conductor 6.
[0011]
That is, in this case, the flat cable connecting bracket 1 is inserted into the flat cable 2 in two rows at the position of the flat conductor 6, and the crimp piece 5 is inserted at the interval Wx to form the connecting portion 13 in the longitudinal direction. The tensile strength corresponds to the tensile strength in the longitudinal direction of the flat conductor 6 having a width of approximately Wx because the crimp pieces 5 are pierced into the flat conductor 6 in two rows and pierced by the interval Wx.
[0012]
For this reason, in order to increase the tensile strength in the longitudinal direction of the flat cable 2, the flat cable connecting bracket 1 having the crimp piece 5 having a wide piercing interval Wx as close as possible to the width Wc of the flat conductor 6 is designed. . Actually, from the viewpoint of piercing work of the crimp piece 5, about 80% of the width Wc of the flat conductor 6, for example, the flat conductor 6 having Wc = 2.5 mm, the crimp piece 5 having a piercing interval Wx = 2.1 mm is used. The flat cable connecting metal fitting 1 is used.
[0013]
At this time, the tensile strength in the width direction of the flat cable 2 when the crimp piece 5 of the flat cable connection fitting 1 is pierced and connected corresponding to a plurality of flat conductors 6 arranged in parallel is one flat. Insulation is determined by the puncture interval Wx in the width direction of the connecting plate portion of the crimp piece 5 pierced by the conductor 6, precisely the puncture position of the crimp piece 5 and the remaining dimension Wy to the edge of the flat conductor 6 on that side. It does not relate to the number of strips of the flat conductor 6.
[0014]
[Problems to be solved by the invention]
However, the conventional flat cable 2 has been installed in consideration of the work so as not to apply stress to the mating connection body 3 and the connection portion 13 due to its special characteristics. When the wiring by 2 is increased and it is also used for the wiring in a narrow place of the vehicle body, not only the longitudinal tension of the flat cable 2 but also the twist and width of the flat cable 2 are unavoidable. An external force such as pulling in the direction is applied, and it is necessary to form the connection portion 13 that can withstand the same handling as a conventional round wire.
[0015]
In particular, in the structure in which the crimp piece 5 is inserted into the flat conductor 6 that is very thin and narrow as described above and caulked, the flat cable 2 to which the flat cable connecting bracket 1 is connected is twisted during wiring and handling. When an external force such as pulling in the lateral direction is applied, the stress is first concentrated on the portion of the flat conductor 6 where the crimp piece 5 of the flat cable connecting metal 1 is pierced, which is the weakest of the connecting portion 13, and the flat conductor from the portion. There was a problem that a crack occurred at the end of 6 and the connecting portion 13 was broken.
[0016]
The object of the present invention is to provide a method for designing a connection portion between a flat cable and a flat cable connection fitting, and a connection portion between the flat cable and the flat cable connection fitting that can withstand wiring in a confined place and rough wiring work. There is to do.
[0017]
[Means for Solving the Problems]
The present invention provides a flat cable connecting bracket having a structure in which a plurality of crimp pieces are erected on both sides in the width direction of a connecting plate portion in a flat cable in which a flat conductor is covered with a flat insulating coating. The present invention is directed to a method for designing a connecting portion between a flat cable and a flat cable connecting metal fitting, in which each crimp piece is pierced to be electrically connected to a flat conductor and each crimp piece penetrating the flat cable is bent and crimped.
[0018]
In the design method of the connecting portion between the flat cable and the flat cable connecting bracket according to the present invention, both the longitudinal tensile strength and the tensile strength in the width direction required for the connecting portion between the flat cable and the flat cable connecting fitting are satisfied. Thus, the puncture interval of the connecting plate part width direction of the crimp piece stabbed into the flat cable within the width of the flat conductor is defined.
[0019]
Specifically, the design method of the connection portion of the flat cable and the flat cable connecting metal fitting according to the present invention has a width of the flat conductor Wc, and a piercing interval in the connecting plate portion width direction of the crimp piece pierced by the flat cable Wx, The remaining dimension from the position of the crimp piece stabbed into the flat cable to the edge of the flat conductor on that side is Wy, and the tensile strength in the longitudinal direction required for the connecting portion between the flat cable and the flat cable connecting bracket is Fd, The flat cable's width Wc in the longitudinal direction of the flat cable is Fw, the width direction tensile strength required for the connecting portion is Fc, and the remaining dimension Wy when the flat cable connector is connected to the flat cable. When the tensile strength in the width direction of the connecting part to Fy is Fy,
Wx in Wc is determined to be not less than [(Fd / Fw) × Wc] and not more than [Wc− (Fc / Fy) × Wy × 2].
[0020]
By designing the connection part of such a flat cable and flat cable connection bracket, it is possible to obtain a flat cable and flat cable connection part connection that can withstand routing in confined areas and rough routing work. Can do.
[0021]
Further, the present invention provides a flat cable connecting bracket having a structure in which a plurality of crimp pieces are erected on both sides in the width direction of the connecting plate portion at the flat conductor in a flat cable in which the flat conductor is covered with a flat insulating coating. Each of the crimp pieces is pierced to be connected to the flat conductor, and each crimp piece penetrating the flat cable is bent and crimped, and the connection portion between the flat cable and the flat cable connection fitting is targeted.
[0022]
In the connecting portion between the flat cable and the flat cable connecting metal fitting according to the present invention, the width of the flat conductor is Wc, the crimping piece inserted into the flat cable is inserted into the connecting plate in the width direction of the connecting plate portion Wx, and the crimped piece inserted into the flat cable The remaining dimension from the position to the edge of the flat conductor on that side is Wy, the tensile strength in the longitudinal direction required for the connecting portion between the flat cable and the flat cable connection fitting is Fd, and the flatness with the flat conductor width Wc The tensile strength in the longitudinal direction of the cable is Fw, the tensile strength in the width direction required for the connecting portion is Fc, and the tensile strength in the width direction of the connecting portion with respect to the remaining dimension Wy when the flat cable connecting bracket is connected to the flat cable. When the strength is Fy,
Wx in Wc is determined to be not less than [(Fd / Fw) × Wc] and not more than [Wc− (Fc / Fy) × Wy × 2].
[0023]
Such a connection portion between the flat cable and the flat cable connecting bracket can withstand wiring in a narrow place and rough wiring work.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a plan view of an example of a connection portion between a flat cable and a flat cable connection fitting manufactured by the method for designing a connection portion between a flat cable and a flat cable connection fitting according to the present invention.
[0025]
In the connection portion of the flat cable and the flat cable connecting bracket of this example, the flat cable 2 has a structure in which three flat conductors 6 having a design width of Wc are arranged in parallel and are collectively covered with a flat insulating coating 7. It has become. At the end of the flat cable 2, trimming portions 8 are respectively provided on the flat insulating coating 7 between the adjacent flat conductors 6 and are partially cut off. The flat cable connector 1 with the fitting connection is connected to each of the separated flat cable 2 parts. The flat cable connection fitting 1 with a fitting connection body is connected to a female fitting connection body 3 integrally with a connection plate portion 4, and crimp pieces 5 are arranged in two rows on both sides in the width direction of the connection plate portion 4. The connecting plate portion 4 has a structure protruding in the width direction with a design piercing interval Wx. The puncture interval Wx when the crimp pieces 5 are projected in a pair is the interval between the outward faces of the opposing crimp pieces 5. The puncture interval Wx when the crimp pieces 5 are projected in a staggered arrangement is an interval between parallel lines along the outward surface of the crimp pieces 5 adjacent to each other in the width direction of the connection plate portion 4. In these flat cable connection fittings 1 with fitting connection bodies, each crimp piece 5 erected in two rows on the connection plate portion 4 is stabbed into the flat cable 2 at the location of the flat conductor 6, and the flat conductor 6 and each crimp Conduction with the piece 5 is taken, and each crimp piece 5 penetrating the flat cable 2 is bent into an arc shape and crimped to form a connection portion 13. In this case, the two rows of crimp pieces 5 are pierced into the flat cable 2 with the piercing interval in the width direction of the connecting plate portion 4 being Wx, and the flats on the side from the position of the crimp piece 5 pierced into the flat cable 2 are flat. The remaining dimension to the edge of the conductor 6 is Wy.
[0026]
Thus, when the tensile force is applied in the longitudinal direction to the flat cable 2 to which the flat cable connection fitting 1 is connected by the piercing of each crimp piece 5, the tensile strength is cut in the flat conductor 6 by the piercing of the crimp piece 5. The portion where the is inserted becomes the weakest portion, and is equivalent to the tensile strength of the flat conductor 6 having a width corresponding to the puncture interval Wx of the crimp piece 5 in the width direction of the connection plate portion 4.
[0027]
On the other hand, as shown in FIG. 2, when an external force is repeatedly applied to the flat cable 2 in the lateral direction, such as f1 and f2, the side of the crimp piece 5 pierced by the flat cable 2 in FIG. If the remaining dimension Wy to the edge of the flat conductor 6 is small, cracks such as C1, C2, and C3 in FIG. 2 occur in the flat conductor 6, and eventually induce cracks between the crimp pieces 5 such as C4 and C5. Will be broken.
[0028]
In order to increase the strength of the connecting portion 13 by such a crimp piece 5, the puncture interval Wx of the crimp piece 5 in the width direction of the connecting plate portion 4 is widened as much as possible to increase the tensile strength in the longitudinal direction of the flat cable 2. At the same time, the remaining dimension Wy from the position of the crimp piece 5 to the edge of the flat conductor 6 on that side must be increased as much as possible to satisfy the contradictory conditions such as increasing the tensile strength in the width direction of the flat cable 2.
[0029]
Therefore, a specific method for designing the connecting portion of the flat cable and the flat cable connecting metal to satisfy this condition will be described.
[0030]
First, the tensile strength when the flat cable 2 of the flat conductor 6 having a width Wc = 2.5 mm is pulled in the longitudinal direction is required to be 160 N by experiments. Fd is the tensile strength in the longitudinal direction actually required for the connecting portion 13 of the flat cable 2 and the flat cable connecting fitting 1, and the width of the flat conductor 6 corresponding to this strength, that is, the crimp piece in the width direction of the connecting plate portion 4. If the design piercing interval of 5 is Wx1, the tensile strength and the flat cable width are in a proportional relationship.
2.5: 160 = Wx1: Fd
That is, 2.5 × Fd = 160 × Wx1
160 / Fd = 2.5 / Wx1
The design piercing interval Wx1 of the crimp piece 5 in the width direction of the connecting plate portion 4 with respect to the tensile in the longitudinal direction is
Wx1> 2.5 x Fd / 160
It is sufficient to satisfy the above conditions.
[0031]
On the other hand, in the flat cable 2 of the flat conductor 6 having a width Wc = 2.5 mm, the connecting portion 13 having a remaining dimension Wy from the position of the crimp piece 5 to the edge of the flat conductor 6 on the side in FIG. It is required that the tensile strength when it is pulled to 180 N is experimentally 180 N. When the tensile strength in the width direction actually required for the connecting portion 13 is Fc, the width of the flat conductor 6 corresponding to this strength, that is, the design piercing interval of the crimp piece 5 in the width direction of the connecting plate portion 4 is Wx2. Since tensile strength and flat cable width are in a proportional relationship,
0.75: 180 = Wy: Fc
That is, 0.75 × Fc = 180 × Wy, and Wy = (Wc−Wx2) / 2, so that 0.75 × Fc = 180 × [(2.5−Wx2) / 2],
180 / Fc = 0.75 / [(2.5-Wx2) / 2]
Therefore, the design piercing interval Wx2 of the crimp piece 5 in the width direction of the connecting plate portion 4 with respect to the tension in the width direction is
Wx2 <2.5-[(0.75 × 2 × Fc) / 180]
It is sufficient to satisfy the above conditions.
[0032]
That is, the crimp piece 5 in the width direction of the connecting plate portion 4 that satisfies both the tensile strength Fd in the longitudinal direction required for the connecting portion 13 and the tensile strength Fc in the width direction required for the connecting portion 13. The design piercing interval Wx is
The width of the flat conductor 6 is Wc, the piercing interval in the connecting plate portion width direction of the crimp piece 5 pierced by the flat cable 2 is Wx, and the edge of the flat conductor 6 on the side from the position of the crimp piece 5 pierced by the flat cable 2 Wy for the remaining dimension up to the part, Fd for the tensile strength in the longitudinal direction required for the connection part 13, Fw for the tensile strength in the longitudinal direction of the flat cable 2 with the width Wc of the flat conductor 6, and the connection part 13 When the tensile strength in the width direction of the connecting portion 13 with respect to the remaining dimension Wy when the flat cable connecting bracket 1 is connected to the flat cable 2 is Fy,
Wx in Wc may be determined to be not less than [(Fd / Fw) × Wc] and not more than [Wc− (Fc / Fy) × Wy × 2].
[0033]
Actually, the flat cable connector 1 of the crimp piece design method according to the present invention is used to connect the prototype flat cable 2 routed to the roof portion of the vehicle body. That is, the tensile strengths Fd and Fc in the longitudinal direction and the width direction required for the connecting portion 13 are both 90 N, and the flat cable 2 to be used is made of three flat conductors 6 having a width of 2.5 mm made of polyethylene terephthalate film. Insulation coating with flat insulation coating 7 is used, and the calculated stab spacing Wx of the crimp piece 5 in the width direction of the connecting plate portion 4 is 1.4 mm or more and 1.75 mm or less, and actually 1.5 mm piercing A flat cable connector 1 with a spacing was made as a prototype.
[0034]
In the description of this example, the design of the puncture interval of the crimp piece 5 in the connecting plate portion width direction for the flat conductor 6 having a thickness of 0.15 mm and a width of 2.5 mm has been described. In each case, the tensile strength in the longitudinal direction with respect to the width of the flat conductor 6 and the tensile strength with respect to an arbitrary remaining dimension Wy may be experimentally obtained and substituted into the above relational expression.
[0035]
In the connection part of the flat cable and flat cable connection bracket by the above design method,
The width of the flat conductor 6 is Wc, the puncture interval in the connecting plate portion width direction of the crimp piece 5 pierced by the flat cable 2 is Wx, and the edge of the flat conductor 6 on the side from the position of the crimp piece 5 pierced by the flat cable 2 Wy for the remaining dimension up to the part, Fd for the tensile strength in the longitudinal direction required for the connection part 13, Fw for the tensile strength in the longitudinal direction of the flat cable 2 with the width Wc of the flat conductor 6, and the connection part 13 When the tensile strength in the width direction of the connecting portion 13 with respect to the remaining dimension Wy when the flat cable connecting bracket 1 is connected to the flat cable 2 is Fy,
The structure is such that Wx in Wc is not less than [(Fd / Fw) × Wc] and not more than [Wc− (Fc / Fy) × Wy × 2].
[0036]
As the flat cable connection fitting 1 used in the present invention, not only the flat cable connection fitting 1 with a fitting connection body but also a flat cable connection fitting 1 without a fitting connection body as shown in FIG. 3 can be used. The flat cable connecting fitting 1 without the fitting connection body is used when the flat cables 2A and 2B are connected to each other (or overlapped). That is, the flat cables 2A and 2B are arranged to face each other, and the crimp pieces 5 of the flat cable connecting metal fitting 1 are pierced at the positions of the flat conductors 6 of the flat cables 2A and 2B, and the flat conductors 6 are electrically connected. The connecting plates 4 are electrically connected to each other, and are connected by bending and crimping the crimp pieces 5 penetrating the flat cables 2A and 2B. The present invention can be similarly applied to the connection portion thus obtained. In FIG. 3, the connecting plate portion 4 is provided with rising portions 4 a on both sides in the width direction, and crimp pieces 5 are provided in a protruding manner at the tip thereof.
[0037]
Alternatively, as shown in FIG. 4 (B), a flat cable connecting bracket 1 in which crimp pieces 5 project in a zigzag manner on both sides in the width direction of the connecting plate portion 4 as shown in FIG. The present invention can be similarly applied when connecting to the cable 2 by the connecting portion 13. Also in FIG. 4A, the connecting plate portion 4 is provided with rising portions 4a on both sides in the width direction, and crimp pieces 5 are projected in a staggered manner at the tip.
[0038]
【The invention's effect】
In the design method of the connection portion of the flat cable and the flat cable connecting bracket according to the present invention,
Crimp piece connection plate that is inserted into the flat cable within the width of the flat conductor so that both the tensile strength in the longitudinal direction and the tensile strength in the width direction required for the connection part of the flat cable and the flat cable connection fitting are satisfied. Determine the puncture interval in the width direction,
Alternatively, the width of the flat conductor is Wc, the piercing interval in the connecting plate portion width direction of the crimp piece pierced by the flat cable is Wx, and the remaining from the position of the crimp piece pierced by the flat cable to the edge of the flat conductor on that side The dimension is Wy, the tensile strength in the longitudinal direction required for the connecting portion between the flat cable and the flat cable connector is Fd, the tensile strength in the longitudinal direction of the flat cable at the flat conductor width Wc is Fw, and the connecting portion. When Fc is the tensile strength in the width direction required for F, and Fy is the tensile strength in the width direction of the connecting portion with respect to the remaining dimension Wy when the flat cable connecting bracket is connected to the flat cable,
Since Wx in Wc is determined to be [(Fd / Fw) × Wc] or more and [Wc− (Fc / Fy) × Wy × 2] or less,
It is possible to obtain a connection portion between a flat cable and a flat cable connecting bracket that can withstand wiring in a narrow place and rough wiring work.
[0039]
Further, in the connection portion between the flat cable and the flat cable connecting metal fitting according to the present invention, the width of the flat conductor is Wc, the crisp interval in the connecting plate portion width direction of the crimp piece pierced by the flat cable is Wx, and the crimp pierced by the flat cable The remaining dimension from the position of one piece to the edge of the flat conductor on that side is Wy, the tensile strength in the longitudinal direction required for the connecting portion between the flat cable and the flat cable connecting bracket is Fd, and the width Wc of the flat conductor is The tensile strength in the longitudinal direction of the flat cable is Fw, the tensile strength in the width direction required for the connecting portion is Fc, and the width of the connecting portion with respect to the remaining dimension Wy when the flat cable connecting bracket is connected to the flat cable. When the tensile strength is Fy,
Since Wx in Wc is determined to be not less than [(Fd / Fw) × Wc] and not more than [Wc− (Fc / Fy) × Wy × 2], it is arranged in a narrow place. Can withstand cable and rough routing work.
[Brief description of the drawings]
FIG. 1 is a plan view of an example of a connection portion between a flat cable and a flat cable connection fitting manufactured by a method for designing a connection portion between a flat cable and a flat cable connection fitting according to the present invention.
FIG. 2 is an explanatory diagram when an external force is repeatedly applied in the lateral direction to the connecting portion of the flat cable.
FIG. 3 is a perspective view of a flat cable connecting a flat cable with a flat cable connecting metal fitting when the flat cable is butt-connected.
FIG. 4A is a perspective view of another example of the flat cable connecting bracket, and FIG. 4B is a perspective view showing a state in which the flat cable connecting bracket is connected to the flat cable.
FIG. 5 is a perspective view of a conventional flat cable connecting bracket and a flat cable before connection.
FIG. 6 is a longitudinal sectional view showing a process of connecting a conventional flat cable connecting bracket to a flat cable.
FIG. 7 is a cross-sectional view of a connecting portion between a conventional flat cable connecting bracket and a flat cable.
FIG. 8 is a plan view of a connecting portion between a conventional flat cable connecting bracket and a flat cable.
FIG. 9 is a perspective view of a flat cable connecting bracket of a conventional flat cable with a flat cable connecting bracket and a state in which the connecting portion is set in a connector housing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flat cable connection metal fitting 2 Flat cable 3 Mating connection body 4 Connection board part 5 Crimp piece 6 Flat conductor 6a Ripped edge part 7 Flat insulation coating 8 Trimming part 9 Support metal fitting 10 Crimp piece bending crimping recessed part 11 Guide member 12 Anvil 13 Connection 14 Connector housing

Claims (2)

Each crimp piece of a flat cable connection bracket is structured such that a flat cable with a flat conductor covered with a flat insulation coating has a structure in which a plurality of crimp pieces are erected on both sides in the width direction of the connection plate at the location of the flat conductor. In the design method of the connection portion between the flat cable and the flat cable connecting metal fitting, the continuity with the flat conductor is taken and the crimp pieces that penetrate the flat cable are bent and crimped.
  The width of the flat conductor is Wc, the piercing interval in the connecting plate portion width direction of the crimp piece pierced by the flat cable is Wx, and the edge of the flat conductor on the side from the position of the crimp piece pierced by the flat cable The remaining dimension up to the portion is Wy, the tensile strength in the longitudinal direction required for the connecting portion between the flat cable and the flat cable connecting fitting is Fd, and the tensile strength in the longitudinal direction of the flat cable at the width Wc of the flat conductor Strength Fw, tensile strength in the width direction required for the connection portion is Fc, and tensile strength in the width direction of the connection portion with respect to the remaining dimension Wy when the flat cable connection fitting is connected to the flat cable. When Fy
  The flat cable and the flat cable are characterized in that the Wx in the Wc is determined to be not less than [(Fd / Fw) × Wc] and not more than [Wc− (Fc / Fy) × Wy × 2]. Design method for cable fittings. Each crimp piece of a flat cable connection bracket is structured such that a flat cable with a flat conductor covered with a flat insulation coating has a structure in which a plurality of crimp pieces are erected on both sides in the width direction of the connection plate at the location of the flat conductor. In the connecting portion of the flat cable and the flat cable connecting metal fitting, the continuity with the flat conductor is pierced and the crimp pieces penetrating the flat cable are bent and crimped.
  The width of the flat conductor is Wc, the piercing interval in the connecting plate portion width direction of the crimp piece pierced by the flat cable is Wx, and the edge of the flat conductor on the side from the position of the crimp piece pierced by the flat cable The remaining dimension up to the portion is Wy, the tensile strength in the longitudinal direction required for the connecting portion between the flat cable and the flat cable connecting fitting is Fd, and the tensile strength in the longitudinal direction of the flat cable at the width Wc of the flat conductor Strength Fw, tensile strength in the width direction required for the connection portion is Fc, and tensile strength in the width direction of the connection portion with respect to the remaining dimension Wy when the flat cable connection fitting is connected to the flat cable. When Fy
  The Wx in the Wc is determined to be not less than [(Fd / Fw) × Wc] and not more than [Wc− (Fc / Fy) × Wy × 2]. Connection between cable and flat cable fitting.

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