JP6364222B2 - Winding mechanism design method - Google Patents

Description

  The present invention relates to a design method and a winding mechanism for a winding mechanism used for winding a flat cable used for wiring of each part in a vehicle or the like.

  In general, in a flat wiring material called a flexible flat cable (FFC), a plurality of conductors are arranged in parallel and the periphery of the conductors is covered with an electrically insulating coating material, and the thickness is uniform. It is formed in such a strip shape. Moreover, the flexible flat cable has flexibility, and can be freely bent especially in the thickness direction.

  For example, on a vehicle or the like, when a flexible flat cable is used to connect a movable electrical component and a fixed electrical component, the flexible flat cable can be used even when the movable electrical component is moved or displaced. The connection state can be maintained by deformation. However, when the flexible flat cable is deformed and bent, for example, a part of the flexible flat cable protrudes and interferes with other devices and members, which may cause various problems.

  Therefore, it is necessary to devise the flexible flat cable used for connection with the movable electrical component so that the extra portion is not bent and protrudes to a position deviated from the predetermined routing route. In other words, a winding mechanism for absorbing excessive bending of the flexible flat cable is required. Patent Documents 1 and 2 are known as prior arts of such a winding mechanism.

  The winding mechanism of Patent Literature 1 and Patent Literature 2 includes a case that can accommodate a part of a flat wiring material (flat harness), a central axis that is arranged inside the case and one end side of the flat wiring material is fixed, A rotating body that is rotatable about a central axis, and a plurality of rollers that are disposed outside the central axis and guide a flat routing material. By rotating the rotating body, it is possible to wind up one end side of the flat wiring material and absorb the excessive deflection.

JP 2012-115008 A JP 2012-238497 A

  By the way, although a flat wiring material like a flexible flat cable can be bent freely with respect to the thickness direction, its durability is limited. In other words, if the number of bending operations increases due to long-term use, the conductor may break. However, for example, in the case where a flat wiring material is used in a place where deformation occurs with the movement of a slide sheet of an automobile, the durability enough to withstand the number of bendings of about 5000 times is assumed assuming that it is used for 10 years. Required.

  On the other hand, when a winding mechanism such as Patent Document 1 and Patent Document 2 is adopted, the flat wiring member is wound while being deformed along the central axis inside the case of the winding mechanism and the outer diameter of the roller. Therefore, the structure of the winding mechanism affects the number of bending durability of the flat wiring material. Therefore, it must be taken into consideration when designing the winding mechanism so that the number of flexing durability times of the flat wiring material does not fall below the desired number of times.

  In addition, the case of the winding mechanism is desired to be as small as possible. However, since the case needs to accommodate the central shaft and all the rollers, the outer diameter of the case also changes when the shaft diameter of the central shaft and the outer diameter of the roller change. In other words, if the shaft diameter of the central shaft and the outer diameter of the roller are changed in consideration of the bending durability of the flat wiring material, the outer diameter of the case must be changed.

The present invention has been made in view of the above-described circumstances, and its purpose is to easily take into account the required number of times of bending durability of the flat wiring material, and to easily reduce the outer diameter of the case. It is to provide a design method of a take-off mechanism.

In order to achieve the above-described object, the winding mechanism design method according to the present invention is characterized by the following (1) to (5) .
(1) A case that is composed of a conductor and a covering material that protects the conductor and that can accommodate at least a part of a flat wiring material having a substantially uniform thickness; A winding mechanism comprising: a central axis with one end fixed; a rotating body that is rotatable about the central axis; and one or more rollers that are disposed outside the central axis and guide the flat routing member A winding mechanism design method for determining the dimensions of each part,
Correlation between the strain generated in the flat wiring material according to the bending radius of the flat wiring material determined by the shaft diameter of the central shaft and the outer diameter of the roller , and the bending durability of the flat wiring material Durability characteristic curve representing
Based on the durability characteristic curve, within a range where the strain satisfies a desired durability condition, a combination of the shaft diameter of the central shaft and the outer diameter of the roller is determined,
Based on each of the combinations and a case dimension curve representing a correlation with the outer diameter of the case, the shaft diameter of the central shaft necessary to minimize the outer diameter of the case, and the outer diameter of the roller To determine the diameter,
A method for designing a winding mechanism.

  According to the design method of the winding mechanism having the configuration of (1) above, the durability considering the influence of the distortion generated in the flat wiring material due to the bending at the central shaft and the roller is set so as to satisfy the desired condition. The shaft diameter and the outer diameter of the roller can be determined. Further, the combination of the shaft diameter of the central shaft and the outer diameter of the roller can be determined so as to minimize the outer diameter of the case.

( 2 ) A method for designing a winding mechanism according to ( 1 ) above,
The combination of the shaft diameter of the central shaft and the outer diameter of the roller is determined so as to satisfy the condition of strain ε generated in the conductor of the flat wiring member obtained from the bending durability number N of the flat wiring member. The
A method for designing a winding mechanism .
( 3 ) A method for designing a winding mechanism according to ( 2 ) above,
The strain ε is expressed by the following calculation formula, where N is the number of bending endurances and k1 and k2 are constants determined in advance: N = k1 · ε−k2
Meet,
A method for designing a winding mechanism.
( 4 ) A method for designing the winding mechanism according to ( 2 ) above,
The combination of the shaft diameter of the central shaft and the outer diameter of the roller is that the conductor thickness is ta, the covering material thickness is tb, the shaft diameter of the central shaft is Ra, and the outer diameter of the roller is Rb. Based on the following condition: ε = {((ta / 2) / (Ra + ta / 2 + tb)) + ((ta / 2) / (Rb + ta / 2 + tb))} / 2
Determined to meet,
A method for designing a winding mechanism.
( 5 ) A method for designing a winding mechanism according to ( 2 ) above,
The combination of the shaft diameter of the central shaft and the outer diameter of the roller satisfies the condition of the strain ε, and is a minimum value of a case dimension curve representing the correlation between each of the combinations and the outer diameter of the case. It is a combination of close,
A method for designing a winding mechanism.

According to the design method of the winding mechanism having the configuration ( 2 ) above, since the combination of the shaft diameter of the central shaft and the outer diameter of the roller satisfies the condition of strain ε, the durability of the flat wiring material is the desired bending durability. The number of times N is satisfied.
According to the design method of the winding mechanism having the above configuration ( 3 ), since the strain ε can be easily calculated from the above formula, the shaft diameter of the central shaft and the roller diameter are set so as to satisfy the desired bending durability number N. A combination of outer diameters can be defined.
According to the design method of the winding mechanism having the configuration ( 4 ), the combination of the shaft diameter of the central shaft and the outer diameter of the roller can be determined so as to satisfy the condition of the strain ε based on the above calculation formula. .
According to the design method of the winding mechanism having the above configuration ( 5 ), the durability of the flat wiring material satisfies the desired bending durability number N, and the outer diameter of the case can be minimized.

According to the design method of winding mechanism of the present invention, it becomes easy to consider the bending endurance of the flat wiring member is needed also facilitates miniaturization of the case outer diameter.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

FIG. 1 is a flowchart showing a typical processing procedure when the winding mechanism design method of the present invention is carried out. FIG. 2 is a perspective view showing a configuration example of the winding mechanism. FIG. 3 is an exploded perspective view showing the structure of the winding mechanism. FIGS. 4A and 4B are side views showing the configuration of two types of flexible flat cables having different specifications. FIG. 5 is a schematic view showing a typical example of the arrangement state of the flexible flat cable when performing the bending durability test. FIGS. 6A and 6B are graphs showing the bending durability characteristics of two types of flexible flat cables having different conductor thicknesses. FIG. 7 is a graph showing the relationship between the bending durability characteristics of the flexible flat cable and the combination of the central shaft diameter and the roller diameter. FIG. 8 is a graph showing the relationship between the bending durability characteristic curve of the flexible flat cable and the case dimension curve.

  Specific embodiments of the winding mechanism design method and the winding mechanism according to the present invention will be described below with reference to the drawings.

<Example configuration of typical winding mechanism>
The structural example of the flat cable winding apparatus 1 containing the winding mechanism of this embodiment is shown in FIG. Moreover, the state which decomposed | disassembled the principal part of the structure of FIG. 2 is shown in FIG.

  The flat cable winding device 1 is used, for example, for winding a flat cable 2 that is routed between a vehicle and a slide seat that is slidably provided on a floor of the vehicle. In the configuration shown in FIG. 2, one end of the flat cable 2 is connected to a connector provided on the floor side, and the other end side is connected to a connector on the slide seat side via a protector P. The other end side of the flat cable 2 is guided by the protector P and moves along the slide rail.

  The flat cable winding device 1 shown in FIG. 2 is provided in the vicinity of the slide rail, winds up the flat cable 2 as the protector P approaches and moves out the flat cable 2 as the protector P moves away. Thus, loosening of the flat cable 2 between the winding device 1 and the protector P is prevented, thereby preventing the flat cable 2 from interfering with the slide sheet or the like.

  The flat cable 2 has flexibility and is also called FFC (flexible flat cable). The flat cable 2 has a structure as shown in FIG. 4 (A) or FIG. 4 (B), for example. That is, a plurality of core wires (conductors 21A to 21D) arranged in parallel to each other and an insulating coating (covering material 22) covering the periphery of each core wire are provided, and the thickness is substantially uniform. Therefore, the flat cable 2 is formed in the shape of a thin strip having flexibility.

  The core wire is formed by twisting a plurality of conductive wires, and the covering portion is made of a synthetic resin. The flat cable 2 is formed to be sufficiently longer than the sliding distance of the slide sheet. One end side 2A (shown in FIG. 2) is passed through the winding device 1 and then pulled out to the outside. The other end 2 </ b> B is connected to the slide seat side connector via the protector P. In the present embodiment, the flat cable 2 in which a plurality of core wires are made of conductors is used. For example, a flat cable containing an optical fiber instead of a conductor, or a flat cable containing both a conductor and an optical fiber. It may be applicable even if it exists.

  As shown in FIGS. 2 and 3, the flat cable winding device 1 includes a case 3 that houses the wound flat cable 2, a turntable 4 that is rotatably provided in the case 3, and the turntable. A plurality of (six in this embodiment) rollers 5 rotatably supported on 4, and a spiral spring 6 as a biasing means for biasing the rotary table 4 in the winding direction of the flat cable 2. Prepare. The case 3 includes a lower case 3A that accommodates the rotary table 4 and the spiral spring 6, and an upper case 3B that covers the upper surface side of the lower case 3A and closes the case 3 in a hollow shape, and has a substantially central portion in the lower case 3A. A center shaft 7 is provided upright for pivotally supporting the rotary table 4.

  As shown in FIG. 3, the lower case 3 </ b> A is installed flat on the floor of the vehicle, and a bottom portion 31 facing the floor, and a peripheral wall 32 erected in a substantially cylindrical shape along the outer periphery of the bottom portion 31, And a cable lead-out portion 33 for leading the other end of the flat cable 2 to the outside. The upper case 3B includes a substantially disk-shaped top surface portion 35 and a suspended wall 36 that is suspended in a substantially cylindrical shape along the outer periphery of the top surface portion 35 and overlaps the peripheral wall 32 of the lower case 3A. .

  As shown in FIG. 3, the central shaft 7 is erected on the inner surface of the bottom 31 of the lower case 3 </ b> A and is formed in a substantially cylindrical shape as a whole, and the turntable 4 is rotatably supported by the periphery 7 </ b> A. The central shaft 7 has a slit 71 cut from the periphery 7A toward the center and opened in the upper surface 7B, a locking groove 72 cut in a direction perpendicular to the slit 71 and opened in the upper surface 7B, Is formed. The slit 71 is inserted and locked through one end side 2A of the flat cable 2. The one end side 2A of the flat cable 2 inserted through the slit 71 communicates with the slit 71 and penetrates the bottom 31 of the lower case 3A. After being inserted into the through-hole and led out of the lower case 3A, it is connected to the floor-side connector.

  As shown in FIG. 3, the rotary table 4 includes a table main body 41 formed in a disk shape, and a plurality of rotary tables 4 that are provided on the upper surface of the table main body 41 and rotatably support a plurality of rollers 5 (this embodiment). Then, six guide portions 42 are integrally provided. The table main body 41 is formed with a hole 43 through which the central shaft 7 is inserted at the center position.

  As shown in FIG. 3, the plurality of guide portions 42 are formed so as to protrude from the upper surface of the table main body 41, and are arranged in parallel along the circumferential direction of the table main body 41 at equal intervals. Here, the protruding direction of the guide portion 42 indicates the vertical direction and the height direction of the flat cable winding device 1.

  The plurality of rollers 5 are supported by the pair of support portions 42 </ b> A by inserting the shaft portions between the pair of support portions 42 </ b> A, and the flat cable 2 is wound around the outer periphery of the plurality of rollers 5. It has become. Of the plurality of rollers 5, one roller 5 is a reversing roller 5A (shown in FIG. 2) that reverses the flat cable 2 introduced into the case 3 from the groove 33A toward the central axis 7. .

  The spiral spring 6 is formed by winding an elastic metal in a spiral shape. The spiral spring 6 has an end portion on the center side inserted and fixed in a locking groove 72 of the center shaft 7, and an end portion on the outer peripheral side is locked on the lower surface of the rotary table 4, so that the rotary table 4 is connected to the flat cable. 2 is energized in the winding direction. That is, the rotary table 4 is rotated by a predetermined number in the direction opposite to the winding direction so that the urging force is stored in the spiral spring 6, and then the flat cable 2 reversed by the reversing roller 5A is wound around the outer periphery of the plurality of rollers 5. Thus, the rotary table 4 is biased in the winding direction by the restoring force of the spiral spring 6, and the flat cable 2 is wound around the central shaft 7 and the rotary table 4 by this biasing force.

<Description of bending durability of flat cable 2>
In the flat cable winding device 1 shown in FIGS. 2 and 3, the flat cable 2 is guided along the outer periphery of the plurality of rollers 5 and the outer periphery of the central shaft 7 when the flat cable 2 is wound and fed out. Therefore, it deforms with a relatively small bending radius. Therefore, if the flat cable winding device 1 repeats the winding and unwinding operations due to the use of the vehicle for a long time, the conductor of the flat cable 2 may be disconnected. For this reason, the durability of the flat cable 2 must be considered by the extent that the bending radius becomes smaller due to the influence of the roller 5 and the central shaft 7.

  For example, if the design of the outer diameter of the roller 5 and the shaft diameter of the central shaft 7 is inappropriate in an environment where the number of bending durability times is 5,000 times, the flat cable 2 may reach before the number of bending times reaches 5000 times. There is a possibility that the conductor breaks. Further, if an attempt is made to increase the bending radius in order to increase the durability of the flat cable 2, the outer diameter of the roller 5 and the shaft diameter of the central shaft 7 are increased, and thus the outer diameter of the case 3 must be increased. Hinders downsizing.

<Description of winding mechanism design method>
FIG. 1 shows a typical processing procedure when the winding mechanism design method of the present invention is carried out. That is, by designing according to the procedure shown in FIG. 1, the outer diameter of the roller 5 and the shaft diameter of the central shaft 7 in the flat cable winding device 1 can be determined to be appropriate dimensions.
Before describing the contents shown in FIG. 1, various matters useful for understanding the contents will be described.

<Description of specifications (typical example) of flat cable 2 to which the present invention is applied>
4A and 4B show the structures of two types of flexible flat cables FFC1 and FFC2 having different specifications.

As shown in FIG. 4A, the flexible flat cable FFC1 is composed of four-core conductors 21A, 21B, 21C, 21D and a covering material 22. Detailed specifications are as follows.
FFC1 width: 10.2 [mm]
FFC1 thickness: 0.427 [mm]
Thickness of each conductor 21A, 21B, 21C, 21D: 0.127 [mm]
Width of each conductor 21A, 21B, 21C, 21D: 1.7 [mm]
Resistance of each conductor 21A, 21B, 21C, 21D: 89.2 [mΩ / m]
Material of the covering material 22: PBT RSX10613
The thickness of the covering material 22: 0.15 [mm]

On the other hand, the flexible flat cable FFC2 shown in FIG. 4B is composed of three-core conductors 23A, 23B, and 23C having different widths and a covering material 24. Detailed specifications are as follows.
FFC2 width: 13 [mm]
FFC2 thickness: 0.51 [mm]
Thickness of each conductor 23A, 23B, 23C: 0.15 [mm]
Width of conductor 23A: 5.8 [mm]
The width of the conductor 23B: 1.7 [mm]
Width of conductor 23C: 3.5 [mm]
Resistance of conductor 23A: 20.9 [mΩ / m]
Resistance of the conductor 23B: 72.4 [mΩ / m]
Resistance of conductor 23C: 34.6 [mΩ / m]
Material of the covering material 24: PBT RSX10613
The thickness of the covering material 24: 0.15 [mm]

<Description of bending durability test of flat cable 2>
In order to grasp the tendency of the bending durability characteristics of the flat cable 2, it is necessary to perform a bending durability test on the flat cable 2 of a large number of test samples in advance and acquire test result data.

  When performing the bending endurance test, for example, as shown in FIG. 5, the flat cable 2 is sandwiched between two roller-shaped guide members 81 and 82 having known outer diameters, and the bending motion of 180 degrees is in the opposite direction. The flat cable 2 is bent by applying an external force so as to be repeated alternately. One reciprocating bending motion is defined as one bending time. In this case, since the outer diameters of the guide members 81 and 82 are known, the bending radius of the flat cable 2 during the test can also be grasped. By changing the outer diameter of the guide members 81 and 82 to be used, it is possible to test with various bending radii.

<Specific examples of bending durability>
Test results of bending durability characteristics of two types of flexible flat cables having different conductor thicknesses are shown in FIGS. 6A and 6B, respectively. That is, the graph shown in FIG. 6A is created based on the data of the result of the bending durability test performed on the flat cable 2 having a conductor thickness of 0.127 [mm]. It shows the correlation with the number of times. The graph shown in FIG. 6 (B) is created based on the data of the bending durability test performed on the flat cable 2 having a conductor thickness of 0.15 [mm]. It shows the correlation with the number of times.

  As is apparent from FIGS. 6A and 6B, the number of bending durability of the flat cable 2 has a correlation with the bending radius. Actually, there is a correlation between the distortion generated in the conductor of the flat cable 2 and the number of bending durability. For example, when the bending radius is increased, the distortion generated in the conductor of the flat cable 2 is reduced, and the number of bending durability increases. On the contrary, when the bending radius is reduced, the distortion generated in the conductor of the flat cable 2 is increased, and the number of bending durability is reduced.

That is, the correlation between the bending durability number N and the strain ε can be expressed by the following equation.
N = K1 · ε− ^K2 (1)
Here, K1 and K2 are constants and can be specified based on test result data. As an example, the following constants are assigned to K1 and K2.
K1 = 9.61 · 10 ⁻⁶
K2 = 4.19

In addition, when using the flat cable 2 in an environment different from normal temperature, bending durability changes. Therefore, when the flat cable 2 is used in a low temperature or high temperature environment, the bending durability number N of the above formula (1) is converted to room temperature as follows.
N at low temperature (−30 ° C.) = (N before conversion) /0.46
N at high temperature (65 ° C.) = (N before conversion) /0.37

The correlation between the strain ε and the bending radius R can be expressed by the following equation.
ε = {ta / (R + ta / 2 + tb)} / 2 (2)
ta: Conductor thickness tb: Coating material thickness

<Determination of the shaft diameter of the central shaft 7 and the outer diameter of the roller 5>
When the winding mechanism having the configuration shown in FIGS. 2 and 3 is used, the flat cable 2 is deformed along the outer peripheral shape of the roller 5 and the outer peripheral shape of the central shaft 7. Further, since the dimensions of the outer diameter of the roller 5 and the shaft diameter of the central shaft 7 are independent, the bending radius R in the above expression (2) changes accordingly.

The relationship between the strain ε and the shaft diameter Ra of the central shaft 7 and the outer diameter Rb of the roller 5 is expressed by the following equation.

  Substituting the strain ε obtained from the above expression (1) based on the desired number of bending durability N into the above expression (3), various combinations of the shaft diameter Ra of the central shaft 7 and the outer diameter Rb of the roller 5 are obtained. Whether or not the condition of the strain ε is satisfied can be identified. For example, when the desired bending durability number N is 5000 and the conductor thickness of the flat cable 2 is 0.127 [mm], a characteristic curve C11 as shown in FIG. 7 is obtained. This characteristic curve C11 represents the boundary of whether or not the combination of the shaft diameter Ra of the central shaft 7 and the outer diameter Rb of the roller 5 satisfies the condition of strain ε, that is, the desired number of bending durability times N. Therefore, for example, using the characteristic curve C11 of FIG. 7, the combination of the shaft diameter Ra of the central shaft 7 and the outer diameter Rb of the roller 5 can be determined so as to obtain a desired bending durability number N.

<Relationship between the outer diameter of the case 3, the shaft diameter of the central shaft 7, and the outer diameter of the roller 5>
On the other hand, the case 3 of the flat cable winding device 1 needs to accommodate the central shaft 7 and all the rollers 5 as shown in FIGS. Therefore, when trying to minimize the outer diameter of the case 3, the lower limit of the outer diameter of the case 3 changes due to restrictions on the shaft diameter of the central shaft 7 and the outer diameter of the roller 5. Actually, the lower limit of the outer diameter of the case 3 changes according to the combination of the shaft diameter of the central shaft 7 and the outer diameter of the roller 5, as in a case dimension curve C12 shown in FIG.

  Therefore, for example, in the situation shown in FIG. 8, the shaft diameter Ra of the central shaft 7 and the roller 5 are set so as to satisfy the condition of the characteristic curve C11 corresponding to the strain ε and to be close to the minimum value of the case dimension curve C12. The combination of the outer diameter Rb is determined. Thereby, the request | requirement of the frequency | count N of desired bending endurances is satisfy | filled, and the case 3 of the flat cable winding apparatus 1 can be reduced in size.

<Description of design procedure>
To summarize the above description, a typical design procedure is as shown in FIG. The contents of FIG. 1 will be described below.

  In advance, a bending durability test is performed on the various flat cables 2 in the state shown in FIG. 5 to obtain actual bending durability times for various bending radii. Thereby, for example, data as shown in FIGS. 6A and 6B is obtained, and is registered in the database DB1.

  Further, in step S10 executed in advance, constants K1 and K2 of calculation formulas representing the correlation between the bending durability number N of the flat cable 2 and the strain ε are calculated based on the test data registered in the database DB1. .

  In step S11, the conductor thickness ta and the covering material thickness tb are determined based on the specifications of the actual flat cable 2 applied to the winding mechanism to be designed.

  In step S12, the bending durability number N required in the environment where the winding mechanism to be designed is used is determined.

  In step S13, the bending durability count N determined in the equation (1) is substituted to calculate the strain ε (the upper limit value that satisfies the requirement). Here, the constants determined in step S10 are applied to the constants K1 and K2 in the expression (1).

  In step S14, the strain ε calculated in S13 is substituted into the equation (2), and a bending radius R corresponding to the bending durability number N is calculated. Note that step S14 may be omitted.

  In step S15, the strain ε calculated in S13 is substituted into the expression (3), and a combination of the shaft diameter Ra of the central shaft 7 and the outer diameter Rb of the roller 5 corresponding to the bending durability number N and the bending radius R is calculated. To do. That is, for example, the boundary condition corresponding to the characteristic curve C11 shown in FIGS. 7 and 8 is determined.

  In step S16, a combination that minimizes the outer diameter of the case 3 is selected from the combinations of Ra and Rb that satisfy the condition of the strain ε, based on the case dimension curve C12, and the final shaft diameter Ra of the central shaft 7 is selected. And the combination of the outer diameter Rb of the roller 5 is determined. For example, in the case of the condition shown in FIG. 8, a combination of Ra and Rb at a position close to the minimum value of the case dimension curve C12 or a position close thereto is selected in the region above the characteristic curve C11 that satisfies the condition of strain ε. . As a result, the dimensions of the winding mechanism can be optimized so as to satisfy the required condition of the bending durability number N and to minimize the outer diameter of the case 3.

  For the winding mechanism designed using the design procedure shown in FIG. 1, when the conductor thickness ta of the flat cable 2 is not less than 0.1 mm and less than 0.15 mm, the shaft diameter of the central shaft 7 is 10 mm. The outer diameter of the roller 5 is determined within a range of ˜40 mm, and within a range of 10-30 mm. Further, when the conductor thickness ta of the flat cable 2 is not less than 0.15 mm and less than 0.2 mm, the shaft diameter of the central shaft 7 is in the range of 10 to 50 mm, and the outer diameter of the roller 5 is in the range of 10 to 40 mm. Respectively.

  As described above, according to the winding mechanism design method and the winding mechanism of the present invention, it becomes easy to consider the required number of bending durability of the flat wiring material, and the case outer diameter can be easily reduced. .

Here, the features of the above-described winding mechanism design method and winding mechanism embodiment according to the present invention will be briefly summarized in the following (1) to (11).
(1) A flat wiring material (flat cable) composed of conductors (21A, 21B, 21C, 21D, 23A, 23B, 23C) and covering materials (22, 24) for protecting the conductors and having a substantially uniform thickness. 2) a case (3) capable of accommodating at least a part thereof, a central axis (7) disposed inside the case and fixed to one end of the flat cable, and rotatable about the central axis Winding for determining the dimensions of each part of a winding mechanism comprising a rotating body (rotating table 4) and one or more rollers (5) arranged outside the central axis and guiding the flat routing material A design method of a take-off mechanism,
The strain (ε) generated in the flat cable according to the bending radius (R) of the flat cable determined by the central axis and the outer diameter of the roller, and the bending durability of the flat cable Obtain a durability characteristic curve (first equation) representing the correlation,
Based on the durability characteristic curve, a combination of the shaft diameter of the central shaft and the outer diameter of the roller is determined within a range in which the strain satisfies a desired durability condition (range above C11). ,
Based on each of the combinations and a case dimension curve (C12) representing a correlation between the outer diameters of the cases, the shaft diameter of the central axis necessary to minimize the outer diameter of the cases, Determine the outer diameter of the roller,
A method for designing a winding mechanism.
(2) A flat wiring material (flat cable) composed of conductors (21A, 21B, 21C, 21D, 23A, 23B, 23C) and covering materials (22, 24) for protecting the conductors and having a substantially uniform thickness. A case (3) capable of accommodating at least a portion of 2);
A central axis (7) disposed inside the case and fixed to one end of the flat cable;
A rotating body (rotary table 4) rotatable about the central axis;
A winding mechanism comprising one or more rollers (5) arranged outside the central axis and guiding the flat routing material,
When the conductor thickness of the flat cable is 0.1 mm or more and smaller than 0.15 mm, the shaft diameter of the central shaft is within a range of 10 to 40 mm, and the outer diameter of the roller is within a range of 10 to 30 mm. It is in,
A winding mechanism characterized by that.
(3) A flat wiring material (flat cable) composed of conductors (21A, 21B, 21C, 21D, 23A, 23B, 23C) and covering materials (22, 24) for protecting the conductors and having a substantially uniform thickness. A case (3) capable of accommodating at least a portion of 2);
A central axis (7) disposed inside the case and fixed to one end of the flat cable;
A rotating body (rotary table 4) rotatable about the central axis;
A winding mechanism comprising one or more rollers (5) arranged outside the central axis and guiding the flat routing material,
When the conductor thickness of the flat cable is 0.15 mm or more and smaller than 0.2 mm, the shaft diameter of the central shaft is within a range of 10 to 50 mm, and the outer diameter of the roller is within a range of 10 to 40 mm. It is in,
A winding mechanism characterized by that.
(4) A winding mechanism configured as described in (2) above,
The combination of the shaft diameter of the central shaft and the outer diameter of the roller is determined so as to satisfy the condition of strain ε generated in the conductor of the flat wiring member obtained from the bending durability number N of the flat wiring member. ing,
A winding mechanism characterized by that.
(5) A winding mechanism configured as described in (4) above,
The strain ε is expressed by the following calculation formula, where N is the number of bending endurances and k1 and k2 are constants determined in advance: N = k1 · ε− ^k2
Meet,
A winding mechanism characterized by that.
(6) A winding mechanism configured as described in (4) above,
The combination of the shaft diameter of the central shaft and the outer diameter of the roller is that the conductor thickness is ta, the covering material thickness is tb, the shaft diameter of the central shaft is Ra, and the outer diameter of the roller is Rb. Based on the following condition: ε = {((ta / 2) / (Ra + ta / 2 + tb)) + ((ta / 2) / (Rb + ta / 2 + tb))} / 2
Determined to meet,
A winding mechanism characterized by that.
(7) A winding mechanism configured as described in (4) above,
The combination of the shaft diameter of the central shaft and the outer diameter of the roller satisfies the condition of the strain ε, and is a minimum value of a case dimension curve representing the correlation between each of the combinations and the outer diameter of the case. Close combination,
A winding mechanism characterized by that.
(8) A winding mechanism configured as described in (3) above,
The combination of the shaft diameter of the central shaft and the outer diameter of the roller is determined so as to satisfy the condition of strain ε generated in the conductor of the flat wiring material obtained from the bending durability number N of the flat wiring material. The
A winding mechanism characterized by that.
(9) A winding mechanism configured as described in (8) above,
The strain ε is expressed by the following formula, where N is the number of bending durability and k1 and k2 are constants determined in advance.
N = k1 · ε− ^k2
Meet,
A winding mechanism characterized by that.
(10) A winding mechanism configured as described in (8) above,
The combination of the shaft diameter of the central shaft and the outer diameter of the roller is that the conductor thickness is ta, the covering material thickness is tb, the shaft diameter of the central shaft is Ra, and the outer diameter of the roller is Rb. Based on the following condition: ε = {((ta / 2) / (Ra + ta / 2 + tb)) + ((ta / 2) / (Rb + ta / 2 + tb))} / 2
Determined to meet,
A winding mechanism characterized by that.
(11) A winding mechanism configured as described in (8) above,
The combination of the shaft diameter of the central shaft and the outer diameter of the roller satisfies the condition of the strain ε, and is a minimum value of a case dimension curve representing the correlation between each of the combinations and the outer diameter of the case. Winding mechanism characterized by close combination.

DESCRIPTION OF SYMBOLS 1 Flat cable winding device 2 Flat cable 3 Case 4 Rotary table 5 Roller 6 Spiral spring 7 Center shaft 21A, 21B, 21C, 21D, 23A, 23B, 23C Conductor 22, 24 Coating | covering material 41 Table main body 42 Several guide part C11 Characteristic curve C12 Case dimension curve DB1 Database K1, K2 Constant N Number of flexing durability ε Strain Ra Center shaft shaft diameter Rb Roller outer diameter ta Conductor thickness tb Coating material thickness

Claims (5)

A case composed of a conductor and a covering material for protecting the conductor and capable of accommodating at least a part of a flat wiring material having a substantially uniform thickness, and one end side of the flat wiring material fixed inside the case Each part of a winding mechanism comprising a central axis, a rotating body that is rotatable about the central axis, and one or more rollers that are arranged outside the central axis and guide the flat routing material A winding mechanism design method for determining the dimensions of
Correlation between the strain generated in the flat wiring material according to the bending radius of the flat wiring material determined by the shaft diameter of the central shaft and the outer diameter of the roller , and the bending durability of the flat wiring material Durability characteristic curve representing
Based on the durability characteristic curve, within a range where the strain satisfies a desired durability condition, a combination of the shaft diameter of the central shaft and the outer diameter of the roller is determined,
Based on each of the combinations and a case dimension curve representing a correlation with the outer diameter of the case, the shaft diameter of the central shaft necessary to minimize the outer diameter of the case, and the outer diameter of the roller To determine the diameter,
A method for designing a winding mechanism. A method for designing a winding mechanism according to claim 1 ,
The combination of the shaft diameter of the central shaft and the outer diameter of the roller is determined so as to satisfy the condition of strain ε generated in the conductor of the flat wiring member obtained from the bending durability number N of the flat wiring member. The
A method for designing a winding mechanism. A method for designing a winding mechanism according to claim 2 ,
The strain ε is expressed by the following calculation formula, where N is the number of bending endurances and k1 and k2 are constants determined in advance: N = k1 · ε−k2
Meet,
A method for designing a winding mechanism. A method for designing a winding mechanism according to claim 2 ,
The combination of the shaft diameter of the central shaft and the outer diameter of the roller is that the conductor thickness is ta, the covering material thickness is tb, the shaft diameter of the central shaft is Ra, and the outer diameter of the roller is Rb. Based on the following condition: ε = {((ta / 2) / (Ra + ta / 2 + tb)) + ((ta / 2) / (Rb + ta / 2 + tb))} / 2
Determined to meet,
A method for designing a winding mechanism. A method for designing a winding mechanism according to claim 2 ,
The combination of the shaft diameter of the central shaft and the outer diameter of the roller satisfies the condition of the strain ε, and is a minimum value of a case dimension curve representing the correlation between each of the combinations and the outer diameter of the case. It is a combination of close,
A method for designing a winding mechanism.

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