JP2010193571A - Cable fixing structure and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cable fixing structure which has improved cable holding force, prevents increase in size, and improves workability, and a method therefor. <P>SOLUTION: An insertion cylinder 23 is inserted into each of a plurality of electric wires 24 and a sheath 25 while inserting the plurality of electric wires 24 into a space 28 inside the insertion cylinder 23. A metal sleeve 22 attached in advance to a cable 21 is slid to a position of the insertion cylinder 23, and after that, the metal sleeve 22 is caulked. At this time, the sheath 25 is held by a protrusion 26 of the metal sleeve 22 and a recess 29 of the insertion cylinder 23. The sheath 25 is held and may not come off. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a structure and a method for fixing a cable by caulking a metal sleeve.

  The two cable fixing structures disclosed in Patent Document 1 below will be described with reference to FIG.

  In FIGS. 7A and 7B, reference numeral 1 indicates an electric cable. Reference numeral 2 denotes a fixture that is bolted to a case (not shown). The electric cable 1 includes a plurality of electric wires 3 and a sheath 4 provided outside the electric wires 3. On the other hand, the fixture 2 is inserted into a sleeve portion 5 for inserting the electric cable 1, a flange portion 6 formed integrally with the sleeve portion 5, and a hole 7 formed through the flange portion 6. And a bolt (not shown) for fixing the bolt. Reference numeral 8 indicates a bar-shaped mandrel.

  In the above configuration, the electric cable 1 is fixed by inserting a mandrel 8 at the center position of the plurality of electric wires 3 as shown in the figure, and thereafter inserting the mandrel 8 into the sleeve portion 5 and caulking the sleeve portion 5. It has come to be. Reference numeral 9 of the sleeve portion 5 indicates a caulking portion generated by caulking. The plurality of caulking portions 9 are formed over the entire circumference. In the electric cable 1, the sheath 4 is partially compressed and clamped between the caulking portion 9 and the mandrel 8, whereby the electric cable 1 is fixed (the use of the mandrel 8 is one way. The second cable fixing structure will be used).

  In FIG. 7C, a cylindrical mandrel 11 that replaces the mandrel 8 is inserted between the presser winding 10 on the outside of the plurality of electric wires 3 and the sheath 4. When the sleeve portion 5 is caulked in the same manner as described above, the sheath 4 is partially compressed and sandwiched between the caulking portion and the mandrel 11 so that the sheath 4 is fixed (using the mandrel 11). Is the second cable fixing structure).

JP 2007-299819 A

  The above prior art is a cable fixing structure in which the electric cable 1 is fixed by caulking the sleeve portion 5, but there is a concern that the holding force may be reduced due to factors such as deterioration over time. More specifically, the caulking portion 9 is generated by caulking. However, since the surface of the mandrel 8 and the mandrel 11 is a simple curved surface, if the sheath 4 is thinned, the holding force is reduced. This is unavoidable, and this is a concern.

  In addition, since the above-mentioned prior art needs to insert the entire terminal of the electric cable 1 into the sleeve portion 5, it is necessary to form a large hole in the case (not shown) according to the size of the electric cable 1. Therefore, in the case of the above prior art, a necessary and sufficient hole diameter must be ensured in the case, which leads to an increase in the size of the case.

  Considering the use of a cable in which a plurality of optical fibers are covered with a sheath instead of the electric cable 1, the work in this case is performed by inserting the cable into the fixture 2 and the case and then the optical fiber in the case. It becomes the procedure which performs the terminal processing of. When the length of the optical fiber in the case is short, the wall surface of the case gets in the way and it becomes difficult to work, so there is a risk of damaging the optical fiber terminal.

  The present invention has been made in view of the above-described circumstances, and provides a cable fixing structure and method capable of improving the cable holding force, and capable of preventing enlargement and improving workability. The task is to do.

  The cable fixing structure of the present invention according to claim 1, which has been made to solve the above-described problems, includes a cylindrical insertion tube portion inserted inside the sheath, and a cylindrical metal sleeve provided outside the sheath. In the cable fixing structure in which the sheath is sandwiched by caulking the metal sleeve, thereby fixing the cable, the metal sleeve has one or more protrusions protruding inward of the metal sleeve in advance. One or a plurality of convex portions projecting inward by forming or caulking, and the insertion tube portion is recessed at a position corresponding to the convex portion on the outer surface of the insertion tube portion It is characterized in that it has one or more.

  According to the present invention having such a feature, when the cylindrical metal sleeve is crimped, the sheath is sandwiched between the concave portion of the insertion cylindrical portion and the convex portion of the metal sleeve. If a plurality of recesses and protrusions are provided, the sheath will be in a substantially wavy cross-sectional state by being sandwiched. Therefore, even if the sheath is thin (deterioration with time), there are many parts that are caught and will not come off. .

  A cable fixing structure according to a second aspect of the present invention is the cable fixing structure according to the first aspect, wherein the insertion tube portion is a part of the structure.

  According to the present invention having such a feature, it is possible to make the hole for inserting the wire on the structure side smaller than integrating the metal sleeve into the structure. Therefore, it is possible to easily secure the hole diameter for inserting the wire.

  The cable fixing structure according to a third aspect of the present invention is the cable fixing structure according to the second aspect, wherein the insertion tube portion has a divided structure that is divided at a portion for accommodating the wire inside the sheath. It is characterized by being.

  According to the present invention having such a feature, it is possible to insert the processing terminal into the structure after processing the cable terminal.

  A cable fixing structure according to a fourth aspect of the present invention is the cable fixing structure according to the third aspect, wherein the dividing structure has a dividing surface that forms a stepped surface with a stepped shape to form a meshing shape. It is said.

  According to the present invention having such a feature, it is possible to disperse the pressure when caulking is applied in a shape. When a cylindrical metal sleeve is caulked from the entire circumference, if the dividing surface is a simple surface, there is a possibility that displacement will occur at the position of this dividing surface (when the pressure is large). In the invention, such a shift does not occur because the meshed dividing surface is used.

  The cable fixing method of the present invention according to claim 5, which has been made in order to solve the above-described problem, is a state in which a cylindrical insertion tube portion is divided and then the wire rod existing inside the cable sheath is divided. A first step of accommodating the tube portion at a predetermined position, a second step of combining the divided insertion tube portion and inserting the insertion tube portion between the sheath and the wire, and an outer side of the sheath. A third step of performing caulking on the cylindrical metal sleeve and sandwiching the sheath between the concave portion of the insertion cylindrical portion and the convex portion of the metal sleeve is performed.

  According to the present invention having such a feature, after the cable terminal is processed, the processed terminal is put into the structure and the cable is fixed.

  According to the first aspect of the present invention, it is possible to provide a cable fixing structure capable of improving the cable holding force.

  According to the second aspect of the present invention, there is an effect that it is possible to prevent the structure side from being enlarged.

  According to the third aspect of the present invention, it is possible to process the cable terminal first. Thereby, there exists an effect that improvement of workability can be considered.

  According to the present invention described in claim 4, there is an effect that deformation of the insertion tube portion due to pressure when caulking is performed can be prevented.

  According to the fifth aspect of the present invention, there is an effect that it is possible to provide a cable fixing method capable of considering improvement in workability.

It is sectional drawing which shows the cable fixing structure of this invention (1st Example). It is a disassembled perspective view of a housing. It is sectional drawing which shows the cable fixing structure of this invention (2nd Example). It is a disassembled perspective view of a housing. It is a figure of the insertion cylinder part of a housing, (a) is a side view, (b) is a front view. It is sectional drawing which concerns on description of caulking. It is a figure which shows the cable fixing structure of a prior art example, (a), (b) is sectional drawing which shows the 1st cable fixing structure, (c) is sectional drawing which shows the 2nd cable fixing structure.

  A cylindrical insertion cylinder part inserted inside the sheath and a cylindrical metal sleeve provided outside the sheath are used. When the metal sleeve is crimped in a state where the insertion tube portion is inserted inside the sheath, at this time, the sheath is sandwiched and compressed by the convex portion of the metal sleeve and the concave portion of the insertion tube portion. The sheath is held so that it does not come off. The cable is fixed.

  The first embodiment will be described below with reference to the drawings. FIG. 1 is a sectional view showing a cable fixing structure of the present invention. FIG. 2 is an exploded perspective view of the housing.

  In FIG. 1, reference numeral 21 indicates a cable. Reference numeral 22 indicates a metal sleeve. Further, reference numeral 23 indicates an insertion tube portion.

  In the present embodiment, the cable 21 is an electric cable, and includes a plurality of electric wires 24 and a sheath 25 provided outside the electric wires 24 (not limited to electric cables, optical fiber cables). May be). As the electric wire 24 and the sheath 25, known ones are used.

  The metal sleeve 22 is a metal cylinder used for caulking, and when the caulking is compressed by the caulking die and the caulking is performed, the plurality of convex portions 26 protrude inward. (It is assumed that the convex portion 26 can be formed by punching in advance. In this case, the punching depth is increased by caulking). The convex portion 26 is formed over the entire circumference. The metal sleeve 22 is formed according to the size of the cable 21 and the length of the insertion tube portion 23.

  The insertion tube portion 23 is a cylindrical member or portion inserted inside the plurality of electric wires 24 and the sheath 25, and is not particularly limited in this embodiment, but is made of a synthetic resin as shown in FIG. Connector housing 27 (upper housing 27a, lower housing 27b).

  The insertion cylinder part 23 is formed in a cylindrical shape, and a plurality of electric wires 24 are inserted into the inner space 28. Moreover, the outer surface of the insertion cylinder part 23 is formed with recesses 29 at positions corresponding to the respective protrusions 26 of the metal sleeve 22 (for convenience, the number of the recesses 29 in FIG. 1 is smaller than that in FIG. 2. 2 may be reduced as shown in FIG. 1. The number is not limited as long as a sufficient holding force can be secured). The concave portion 29 is formed so that the sheath 25 pushed inward by the convex portion 26 can be accommodated while being compressed. The recess 29 is formed over the entire circumference.

  In the above configuration and structure, the cable fixing method is such that the insertion tube portion 23 is inserted inside the plurality of wires 24 and the sheath 25 while inserting the plurality of wires 24 into the space 28 inside the insertion tube portion 23 (first step). Is inserted (second step), and the metal sleeve 22 previously mounted on the cable 21 is slid to the position of the insertion tube portion 23, and then the metal sleeve 22 is crimped (third step). At this time, the sheath 25 is sandwiched between the convex portion 26 of the metal sleeve 22 and the concave portion 29 of the insertion tube portion 23 (see FIG. 1). As a result, the sheath 25 is held and does not come off. The cable 21 is fixed to the lower housing 27b (see FIG. 2).

  When caulking is applied to the cylindrical metal sleeve 22, the sheath 25 is sandwiched between the concave portion 29 of the insertion tube portion 23 and the convex portion 26 of the metal sleeve 22, and the concave portion 29 and the convex portion 26 are Since a plurality of sheaths 25 are formed, the sheath 25 is in a state of a substantially wavy cross section by being sandwiched. Therefore, even if the sheath 25 is thin (deterioration with time), the cable 21 does not come off because of the structure with many catches due to unevenness.

  As described above with reference to FIGS. 1 and 2, according to the present invention, the concave portion 29 and the convex portion 26 have an effect that the cable holding force can be improved as compared with the conventional case.

  Further, according to the present invention, since the insertion tube portion 23 is integrated with the connector housing 27, the hole on the connector housing 27 side for inserting the plurality of electric wires 24 can be made smaller than in the conventional example. There is an effect. Therefore, according to the present invention, it is possible to easily secure the hole diameter for inserting the wire and to reduce the size.

  Further, according to the present invention, since the core 8 and the core 11 (see FIG. 7) as in the conventional example are not used, it is possible to reduce the number of parts and work man-hours.

  The second embodiment will be described below with reference to the drawings. FIG. 3 is a cross-sectional view showing the cable fixing structure of the present invention. 4 is an exploded perspective view of the housing, FIG. 5 is a view of an insertion tube portion of the housing, (a) is a side view, (b) is a front view, and FIG. 6 is a cross-sectional view relating to explanation of caulking. is there. The same components as those in the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted.

  In FIG. 3, reference numeral 31 indicates a cable. Reference numeral 32 indicates a metal sleeve. Further, reference numeral 33 indicates an insertion tube portion.

  In the present embodiment, the cable 31 is an optical fiber cable, and includes a plurality of optical fibers 34 and a sheath 35 provided outside the optical fiber 34 (the electric cable 21 of the first embodiment). May be). Known optical fibers 34 and sheaths 35 are used.

  The metal sleeve 32 is a metal cylinder used for caulking, and when the caulking die is compressed and caulked, the plurality of convex portions 36 project inward. (It is assumed that the convex portion 36 can be formed by punching in advance. In this case, the punching depth is increased by caulking). The convex portion 36 is formed over the entire circumference. The metal sleeve 32 is formed according to the size of the cable 31 and the length of the insertion tube portion 33.

  The insertion tube portion 33 is a cylindrical member or portion inserted inside the plurality of optical fibers 34 and the sheath 35, and is not particularly limited in the present embodiment. However, as shown in FIG. The optical connector housing 37 (upper housing 37a, lower housing 37b) is integrally formed.

  The insertion tube portion 33 has a split structure that is divided by a receiving portion 38 for receiving a plurality of optical fibers 34 (see FIGS. 4 and 5; the receiving portions in the divided state are 38a and 38b). The one insertion cylinder part 33a in a divided state is integrally formed with the upper housing 37a, and the other insertion cylinder part 33b is integrally formed with the lower housing 37b. The divided structure has a divided surface, and the divided surface is formed to have mesh-shaped divided surfaces 33c and 33d formed in steps as shown in FIGS. The meshing shape dividing surfaces 33c and 33d are formed so as to have a concave-convex shape when the insertion tube portion 33 is viewed from the side surface and a concave-convex shape when viewed from the end surface of the insertion tube portion 33. (See FIG. 5).

  Since the accommodating portion 38 for accommodating the plurality of optical fibers 34 has the above-described divided structure, it is not necessary to insert a wire as in the first embodiment, and thus is formed with a diameter as small as possible.

  The insertion cylinder part 33 is formed in a cylindrical shape. Concave portions 39 are formed on the outer surface of the insertion tube portion 33 at positions corresponding to the respective convex portions 36 of the metal sleeve 32 (for the sake of convenience, the number of the concave portions 39 in FIG. 3 is smaller than that in FIGS. 4 and 5). 4 and 5 may be reduced to the same as in Fig. 3. If a sufficient holding force can be ensured, the number is not limited. The recessed part 39 is formed so that the sheath 35 pushed inward by the projecting part 36 can be compressed and accommodated. The recessed part 39 is formed over the entire circumference.

  In the above-described configuration and structure, the cable fixing method is a state in which the insertion tube portion 33 is divided, that is, the insertion tube portions 33a and 33b, and a plurality of optical fibers 34 that have been subjected to terminal processing after that are accommodated. Accommodated in the portion 38b (first step), and the divided insertion tube portions 33a and 33b are combined and inserted between the sheath 35 and the plurality of optical fibers 34 (second step); and When the metal sleeve 32 previously attached to the cable 31 is slid to the position of the insertion tube portion 33 and then the metal sleeve 32 is crimped (third step), at this time, the sheath 35 is moved to the metal sleeve 32. Between the convex portion 36 and the concave portion 39 of the insertion tube portion 33 (see FIG. 3). As a result, the sheath 35 is held and does not come off. The cable 31 is fixed to the optical connector housing 37 (see FIG. 4).

  When caulking is applied to the cylindrical metal sleeve 32, the sheath 35 is sandwiched between the concave portion 39 of the insertion tube portion 33 and the convex portion 36 of the metal sleeve 32, and the concave portion 39 and the convex portion 36 are formed. Since a plurality of sheaths 35 are formed, the sheath 35 is in a state of a substantially corrugated cross section when sandwiched. Therefore, even if the sheath 35 is thin (deterioration with time), the cable 31 does not come off because it has a structure with many catches due to unevenness.

  For caulking the cylindrical metal sleeve 32, a caulking die 41 as shown in FIG. 6 is used (for convenience, the cable 31 is not shown). The caulking die 41 includes an upper die 41a and a lower die 41b, and a mechanism unit (not shown) that moves them. The upper mold 41 a and the lower mold 41 b have a plurality of convex portions 42 that are driven out against the metal sleeve 32.

  In addition, the insertion cylinder part 33 is a shape which can disperse | distribute the pressure at the time of giving crimping. That is, even if a large pressure is applied by caulking the cylindrical metal sleeve 32 from the entire circumferential direction, the pressure is received by the meshing shape dividing surfaces 33c and 33d as shown by the arrows in FIG. Distributed. The insertion tube portion 33 is formed in a shape that does not shift due to pressure when caulking (the optical fiber 34 will not be caught if there is no position shift, and a better division is achieved). Become a structure).

  As described above with reference to FIGS. 3 to 6, according to the present invention, the concave portion 39 and the convex portion 36 have an effect that the cable holding force can be improved as compared with the conventional art.

  Further, according to the present invention, since the insertion tube portion 33 is integrated with the optical connector housing 37, the holes on the optical connector housing 37 side with respect to the plurality of optical fibers 34 can be made smaller than in the conventional example. Play. Therefore, according to the present invention, it is possible to easily secure the hole diameter for inserting the wire and to reduce the size.

  Further, according to the present invention, since the core 8 and the core 11 (see FIG. 7) as in the conventional example are not used, it is possible to reduce the number of parts and work man-hours.

  Further, according to the present invention, since the insertion tube portion 33 has a split structure, there is no need to insert a plurality of optical fibers 34 into the hole, and as a result, the end processing of the optical fiber 34 is performed on the insertion tube portion 33. There is an effect that it can be done before accommodation. Thereby, there is an effect that it is possible to consider improvement in workability and prevention of damage to the optical fiber 34.

  In addition, according to the present invention, since the split structure having the mesh-shaped split surfaces 33c and 33d is used, it is possible to prevent the insertion tube portion 33 from being deformed by pressure when caulking. Play.

  In addition, the present invention can be variously modified without departing from the spirit of the present invention (for example, a separate structure in which the insertion tube portion 23 is retrofitted to the connector housing 27 may be adopted. Suppose).

21 ... Cable 22 ... Metal sleeve 23 ... Insertion cylinder 24 ... Electric wire (wire)
25 ... Sheath 26 ... Convex 27 ... Connector housing (structure)
DESCRIPTION OF SYMBOLS 28 ... Space 29 ... Recessed part 31 ... Cable 32 ... Metal sleeve 33 ... Insertion cylinder part 33a, 33b ... Insertion cylinder part 33c, 33d ... Intersection shape division surface 34 ... Optical fiber (wire)
35 ... sheath 36 ... convex part 37 ... optical connector housing (structure)
38 ... Accommodating portion 39 ... Concave portion 41 ... Clamping die 41a ... Upper die 41b ... Lower die 42 ... Convex portion

Claims (5)

Using a cylindrical insertion tube portion inserted inside the sheath and a cylindrical metal sleeve provided outside the sheath, the sheath is sandwiched by crimping the metal sleeve, thereby connecting the cable. In the cable fixing structure to fix,
The metal sleeve is formed by previously forming one or a plurality of protrusions protruding inside the metal sleeve, or one or a plurality of protrusions protruding inward by caulking,
The cable insertion structure according to claim 1, wherein the insertion cylinder part has one or a plurality of concave parts at positions corresponding to the convex parts on the outer surface of the insertion cylinder part. The cable fixing structure according to claim 1,
The cable fixing structure, wherein the insertion tube portion is a part of a structure. The cable fixing structure according to claim 2,
The cable insertion structure according to claim 1, wherein the insertion tube portion has a split structure that is split at a portion for accommodating the wire inside the sheath. The cable fixing structure according to claim 3,
The cable-fixing structure according to claim 1, wherein the split structure has a split surface that forms a split surface with a stepped shape to form a meshing shape. A first step of dividing the cylindrical insertion tube portion, and then storing the wire rod existing inside the sheath of the cable at a predetermined position of the insertion tube portion in a divided state;
A second step of uniting the inserted cylindrical portions in a divided state and inserting this between the sheath and the wire;
A third step of crimping a cylindrical metal sleeve provided outside the sheath and sandwiching the sheath between the concave portion of the insertion tube portion and the convex portion of the metal sleeve;
The cable fixing method characterized by performing.

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