JP5086923B2 - A pair of combination members for forming a coated tube, and a method of attaching the coated tube using the same - Google Patents

Description

  The present invention relates to a coated tube for applying moisture proofing, electrical insulation, and mechanical protection to a connecting portion of an electric wire, and in particular, a pair of combination members for forming a coated tube of an electric wire connecting portion. Etc.

  Conventionally, for example, a coated tube as disclosed in Japanese Patent Application Laid-Open No. 7-57798 has been used in order to coat a connection portion between so-called covered wires for the purpose of moisture prevention, electrical insulation, mechanical protection, and the like. ing.

  The coated tube includes a tubular sleeve portion made of a flexible material having electrical insulation, and a tubular seal portion at a plurality of ends of the sleeve portion. The electric connection portion is configured to cover the exposed length portion of the electric wire, and has a structure in which the tubular seal portion is attached to the electric wire connection portion so as to surround the electric wire outer sheath adjacent to the exposed portion length portion. The seal portion includes an elastic contraction element that is in close contact with the outer surface of the electric wire outer sheath of the electric wire connection portion, and the inner diameter of the elastic contraction element is temporarily larger than the outer diameter of the electric wire outer sheath before the covering tube is attached. A core element for forming an insertion diameter is inserted. The core element is removed when the coated tube is installed.

  However, in such a conventional coated tube, one coated electric wire to be connected is inserted into the coated tube, and then, after forming the other coated electric wire and the electric wire connecting portion in an area outside the coated tube, In order to position the connected and formed electric wire connecting portion substantially inside the center of the covered tube, it is necessary to pull back one of the inserted covered electric wires. Therefore, it is necessary to make the maximum outer diameter of the wire connection portion smaller than the minimum inner diameter dimension of the sleeve portion, and this restricts the size (in particular, the radial direction) of forming the wire connection portion.

  Recently, in the wire connection part, it is rare to leave an exposed part of the wire, and after covering the exposed part completely with a seal tape or the like, it is possible to perform an operation of covering the covered tube on this, There may be a demand for high voltage connections. There is a problem that such an operation cannot be applied because the above-described conventional covered tube cannot perform an operation of pulling back one covered electric wire that has been inserted.

  In addition, as is apparent from the drawings of the conventional example, the conventional coated tube needs to have a large diameter enlarged seal part at the end via the core element, and there is a problem that the diameter expansion work is extremely difficult. is there. Moreover, even if the diameter can be expanded, there is a limit to the degree of rubber shrinkage, and there is a tendency for the degree of adhesion to the outer surface of the electric wire skin after removing the core element to occur, so that the adhesion is ensured It is necessary to use rubber with special physical properties.

  In addition, after performing the work of pulling back one of the covered wires inserted in the conventional covered tube, it must be confirmed by palpation that the wire connection portion is located at the center of the covered tube, which is never easy. It cannot be said that there is.

JP-A-7-57798

  The present invention has been created under such circumstances, and the purpose of the present invention is as follows: (1) In the wire connection portion, the maximum outer diameter of the wire connection portion is the substantial minimum inner diameter dimension of the coated tube. In such a case, the covering tube can be covered, and (2) the diameter of the sealing portion at the end of the covering tube can be reduced through the core element so that the diameter expanding operation can be performed. Easy and good adhesion to the outer surface of the outer sheath of the electric wire after removing the core element, and (3) Easy positioning for positioning the electric wire connecting portion at the center of the covering tube It is an object of the present invention to provide a pair of combination members for forming, a coated tube of an electric wire connection portion using the same, and a method for attaching the same.

  In order to solve such a problem, the present invention provides a pair for forming a covered tube of a wire connecting portion used when the maximum outer diameter of the wire connecting portion is larger than the substantially minimum inner diameter dimension of the covered tube. The pair of combination members includes a first cylindrical member and a second cylindrical member, and the first cylindrical member is formed of a first cylindrical elastic body. And a first small-diameter core member that is mounted in the opening at one end thereof and has a diameter-expanding action, and the second cylindrical member includes a second cylindrical elastic body molding, A second small-diameter core member mounted in the opening at one end and having a diameter-expanding action; and a large-diameter core member mounted in the opening at the other end and having a diameter-expanding action; In the cylindrical elastic body molded product, one end constitutes a minimum inner diameter (D1min) and the other end constitutes a maximum inner diameter (D1max). A cylindrical body to be configured, wherein the first small-diameter core member is inserted into an opening portion on the minimum inner diameter (D1min) side, and one end of the second cylindrical elastic body molding has a minimum inner diameter. (D2min) and the other end is a cylindrical body having a maximum inner diameter (D2max), and the second small-diameter core member is inserted into the opening on the minimum inner diameter (D2min) side, The large-diameter core member is inserted into an opening on the inner diameter (D2max) side, and each of the first small-diameter core member and the second small-diameter core member has an inner diameter larger than the outer diameter of the outer skin covering the electric wire. And the inner diameter of the large-diameter core member is set to be larger than the outer diameter of the other end portion of the first cylindrical elastic body molding, and the first cylindrical elastic body molding The other end of the object can be mounted in the large-diameter core member, and the first small-diameter core The member, the second small-diameter core member, and the large-diameter core member can be removed when mounting so as to cover the wire connection portion, and the first cylindrical elastic member can be removed by removing the large-diameter core member. An outer diameter portion of the other end portion of the body molded product is fitted to an inner diameter portion of the other end portion of the second cylindrical elastic body molded product, and the first small diameter core member and By removing the second small-diameter core member, one end of the first cylindrical elastic body molding and one end of the second cylindrical elastic body molding cover the electric wire. It is configured to be in close contact with.

  In addition, as a preferable aspect of the pair of combination members for forming the covering tube of the electric wire connecting portion of the present invention, the lumen portions (electric wires) of the first cylindrical elastic body molded product and the second cylindrical elastic body molded product In the form after the combination, a tapered portion whose inner diameter gradually decreases from the center toward the outside is formed in the tapered portion. The electric wire connecting portion having a diameter larger than that of the outer sheath covering the electric wire can be locked.

  In addition, as a preferable aspect of the pair of combination members for forming the covering tube of the electric wire connecting portion of the present invention, the first cylindrical elastic body molded product and the second cylindrical elastic body molded product are respectively A minimum inner diameter region that can be in close contact with the outer sheath of the wire coating on the end side of the wire, a first taper region that is connected to and expands toward the other end, and a first substantially straight region that is connected to the first taper region And a second taper region connected to the substantially straight region and extending toward the other end, and a second substantially straight region connected to the second taper region.

  In addition, as a preferable aspect of the pair of combination members for forming the covering tube of the wire connection portion of the present invention, the minimum inner diameter region of the first cylindrical elastic body molded product and the second cylindrical elastic body molded product When the first small-diameter core member and the second small-diameter core member are respectively inserted into the lumen to expand the minimum inner diameter region, the outer diameter of the minimum inner diameter region and the first substantially straight region The diameter is configured to be substantially the same outer diameter.

  In addition, as a preferable aspect of the pair of combination members for forming the covering tube of the electric wire connection portion of the present invention, the first cylindrical elastic body molded product and the second cylindrical elastic body molded product are electrically insulating. It is comprised from the material which has.

In addition, as a preferable aspect of the pair of combination members for forming the covering tube of the electric wire connection portion of the present invention, the first cylindrical elastic body molding and the second cylindrical elastic body molding are made of a rubber material. The rubber material has a 200% modulus of 100 to 215 N / cm ² , a tensile strength of 500 to 1185 N / cm ² , an elongation of 500 to 1100%, and a permanent elongation of 3 to 25% (three times expansion at 70 ° C., 240Hr) physical properties.

  The present invention is a method of attaching a covering tube after forming a wire connecting portion using a pair of combination members for forming a covering tube of the above wire connecting portion, which method is a wire connecting object 2 One covered electric wire is inserted into the first cylindrical member, the other covered electric wire is inserted into the second cylindrical member, and the first cylindrical member and the first A wire connecting portion is formed in a gap separated from the two cylindrical members, and then the first cylindrical member and the second cylindrical member are combined, and the first small diameter core member, the second small diameter core member, It is comprised so that the said large diameter core member may be removed.

  The present invention is a method of attaching a covering tube after forming a wire connecting portion using a pair of combination members for forming a covering tube of the above wire connecting portion, which method is a wire connecting object 2 One covered electric wire is inserted into the first cylindrical member, the other covered electric wire is inserted into the second cylindrical member, and the first cylindrical member and the first After forming the electric wire connection part in the gap separated from the cylindrical member of 2, align the first cylindrical member or the second cylindrical member so that the electric wire connection part is the center of the coated tube, The first small-diameter core member or the second small-diameter core member of the aligned first cylindrical member or second cylindrical member is removed, and then the first cylindrical member and the second cylindrical member are combined. Combine, remove remaining first small diameter core member or second small diameter core member and the large diameter core member Configured so that.

  The covered tube of the electric wire connecting portion of the present invention is configured by combining and integrating the pair of combination members for forming the covered tube of the electric wire connecting portion.

  A pair of combination members for forming a coated tube used when the maximum outer diameter of the wire connection portion is larger than the substantially minimum inner diameter dimension of the coated tube, wherein the pair of combined members is a first combination member It is comprised from a cylindrical member and a 2nd cylindrical member, and the said 1st cylindrical member is mounted | worn in the 1st cylindrical elastic body molded object and the opening part of the one end, and has a diameter expansion effect | action. A first small-diameter core member, and the second cylindrical member is mounted in a second cylindrical elastic body molding and an opening at one end thereof and has a diameter-enlarging action. And a large-diameter core member that is attached to the opening at the other end and has a diameter-expanding action, wherein the first small-diameter core member, the second small-diameter core member, and the large-diameter core member It can be removed when mounting so as to cover the part, for the removal of the large-diameter core member Thus, the outer diameter portion of the other end portion of the first cylindrical elastic body molding is fitted into the inner diameter portion of the other end portion of the second cylindrical elastic body molding. By removing the first small-diameter core member and the second small-diameter core member, one end of the first cylindrical elastic body molding and one end of the second cylindrical elastic body molding The part is configured to be in close contact with the outer sheath covering the electric wire, so that the coating tube can be applied unprecedentedly, so that the so-called diameter expansion work is easy and the core element is removed. Adhesiveness to the outer surface of the subsequent outer sheath of the electric wire is good, and there is an effect that the positioning for positioning the electric wire connecting portion at the center of the coated tube can be easily and reliably performed.

  Hereinafter, the best mode for carrying out the present invention will be described.

The present invention relates to a pair of combination members for forming a covered tube of an electric wire connecting portion, a covered tube of an electric wire connecting portion using the same, and a method of attaching the covered tube.
FIG. 1 shows a cross-sectional view of a cylindrical elastic body molding that is a base member of a pair of combination members for forming a coated tube, and FIG. FIG. 3 is a half-sectional view showing a state after attachment of the covering tube.

  First, a pair of combination members for forming a coated tube will be described with reference to FIG.

[Description of a pair of combination members for forming a coated tube]
The present invention relates to a pair of combination members for forming a covered tube of a wire connecting portion used when the maximum outer diameter of the wire connecting portion is larger than the substantially minimum inner diameter dimension of the covered tube. Therefore, in the coated tube, an electric wire connecting portion having a dimension larger than the substantially minimum inner diameter dimension of the coated tube is accommodated inside.

  Here, “substantially minimum inner diameter of the coated tube” means “minimum inner diameter of the coated tube excluding both ends of the coated tube that is in close contact with the outer sheath of the electric wire”. In the prior art, this is the minimum inner diameter of the sleeve portion.

  As shown in FIG. 2, the pair of combination members for forming the coated tube in the present invention includes a first cylindrical member 10 and a second cylindrical member 20.

  The first cylindrical member 10 includes a first cylindrical elastic body molding 11 and a first small-diameter core member 15 that is mounted in the opening of one end 11a and has a diameter expanding action. .

  The second cylindrical member 20 includes a second cylindrical elastic body 21, a second small-diameter core member 25 that is mounted in the opening of one end 21 a and has a diameter expanding action, 25, and the other end 21 b. And a large-diameter core member 26 that is attached to the opening and has a diameter expanding action.

  The first cylindrical elastic body molded product 11 and the second cylindrical elastic body molded product 21 each have a form as shown in FIG. 1 in a single state after molding. Here, the case where both these cylindrical elastic body molded products 11 and 21 are shape | molded as the same shape is demonstrated as an example. Of course, the cylindrical elastic body molded products 11 and 21 do not need to have the same shape, but by using the same shape, there are economical advantages such as reduction in mold manufacturing cost and unit price of the molded product.

  As shown in FIG. 1, the first cylindrical elastic body molded article 11 has a cylindrical body in which one end portion constitutes a minimum inner diameter (D1min) and the other end portion constitutes a maximum inner diameter (D1max). It is. And as FIG. 2 shows, the 1st small diameter core member 15 is inserted in the opening part by the side of the minimum internal diameter (D1min).

  As shown in FIG. 1, the second cylindrical elastic body molded article 21 has a cylindrical body in which one end portion constitutes a minimum inner diameter (D2min) and the other end portion constitutes a maximum inner diameter (D2max). It is. As shown in FIG. 2, the second small-diameter core member 25 is inserted into the opening on the minimum inner diameter (D2min) side, and the large-diameter core member 26 is inserted into the opening on the maximum inner diameter (D2max) side. Has been.

  The first small-diameter core member 15 and the second small-diameter core member 25 each have an inner diameter that is larger than the outer diameter of the outer skin covering the electric wire. This is because it is necessary to be able to perform an operation of inserting the covered electric wire.

  As shown in FIG. 2, the inner diameter P of the large-diameter core member 26 is set to be larger than the outer diameter Q of the other end portion 11 b of the first cylindrical elastic body molding 11. This is because the other end 11 b of the first cylindrical elastic body 11 can be mounted in the large-diameter core member 26.

  The first small-diameter core member 15, the second small-diameter core member 25, and the large-diameter core member 26 are configured to be removable when mounted so as to cover the electric wire connection portion. The configuration and operation of these core members are already generally known in the prior art. Specifically, each of the first small-diameter core member 15, the second small-diameter core member 25, and the large-diameter core member 26 is a cylindrical member made of, for example, hard plastic, and usually extends over the entire length of the cylindrical wall. A notch extending in a spiral shape and extension portions 15a, 25a, and 26a (FIG. 2) extending in a strip shape on the inner end face, and the distal end of the extension portion is disposed on the outer opening side of the opening portion.

  As described above, since the other end portion 11b (outer diameter Q) of the first cylindrical elastic body molding 11 is mounted inside the large diameter core member 26 (inner diameter P), the large diameter core member 26 is provided. The tip of the extension 26a extending in the form of a strip is pulled out from the mounting gap ((PQ) / 2). And by pulling this thing, the string is unscrewed.

  Each core member 15, 25, 26 has a diameter-expanded state against the elastic recovery force of the cylindrical elastic body molding when these are attached to the end of the cylindrical elastic body molding. It has sufficient strength to hold.

  From the state shown in FIG. 2, the other end portion 11b of the first cylindrical elastic body molded article 11 is mounted within the inner diameter of the large-diameter core member 26, and then the large-diameter core member 26 is spirally formed. By removing while unraveling, the outer diameter Q of the other end 11b of the first cylindrical elastic body molding 11 is changed to the inner diameter P of the other end 21b of the second cylindrical elastic body molding 21. (Refer to the state of FIG. 3).

  Further, the first small-diameter core member 15 and the second small-diameter core member 25 are removed while being unraveled in a spiral manner, respectively, so that one end 11a of the first cylindrical elastic body molded product 11 and the second small-diameter core member 11 are removed. One end 21a of the cylindrical elastic body molding 21 is in close contact with the outer skin covering the electric wire (see the state of FIG. 3). In FIG. 3, the code | symbol 33 has shown the electric wire outer sheath (what is called an electric wire).

  As shown in FIG. 3, lumen portions of the first cylindrical elastic body molding 11 and the second cylindrical elastic body molding 21 (one end portion that is in close contact with the outer skin covering the electric wire) In the configuration after the combination, a tapered portion T whose inner diameter gradually decreases from the center toward the outside is formed. And the electric wire connection part 50 whose diameter is larger than the outer skin | cover which coat | covers an electric wire can be latched to this taper part T. FIG. That is, in the present invention, as described above, the electric wire connecting portion having a dimension larger than the substantially minimum inner diameter dimension of the coated tube can be accommodated inside. The existing ones (for example, the coated tube disclosed in the prior art) often cannot accommodate a wire connecting portion having a dimension that is about four times larger than the diameter of the outer sheath covering the wire, and the maximum of the wire connecting portion. If the outer diameter is larger than the minimum inner diameter of the sleeve, it cannot be used.

  In the present invention, the wire connection portion 50 having a diameter larger than the outer sheath covering the wire covers the exposed connection portion with a material having a certain degree of hardness, for example, an insulating rubber material (such as EPT or silicone rubber). Thus formed.

  When the suitable one form of the 1st cylindrical elastic body molding 11 and the 2nd cylindrical elastic body molding 21 itself is given, respectively, as FIG. 1 shows, it is an electric wire in one edge part side. A minimum inner diameter region (H) that can be in close contact with the outer skin of the coating; a first taper region (I) that is connected to and expands toward the other end; and a first substance that is connected to the first taper region (I). A straight straight region (J), a second tapered region (K) connected to the substantially straight region (J) and extending toward the other end, and a second tapered region (K) connected to the second tapered region (K). And a substantially straight region (L). The substantially straight region here means a region within 5 degrees when expressed as a taper angle.

  Then, the first small-diameter core member 15 and the second small-diameter core member 25 are disposed in the lumen of the minimum inner diameter region (H) of the first cylindrical elastic body molded product 10 and the second cylindrical elastic body molded product 20. When the minimum inner diameter region (H) is expanded by insertion, the outer diameter of the minimum inner diameter region (H) is substantially the same as the outer diameter of the first substantially straight region (I). Therefore, it is desirable to design so as to eliminate the step. Substantially the same outer diameter means a diameter within a range of ± 10%. By designing so as to eliminate the step as described above, handling of the pair of combination members 10 and 20 itself becomes extremely easy, and the installation work of the coated tube can be performed smoothly.

The 1st cylindrical elastic body molding 11 and the 2nd cylindrical elastic body molding 21 require electrical insulation and elastic expansion-contraction action. Accordingly, these materials are desirably formed from a rubber material. As a rubber material to be used, a 200% modulus is 100 to 215 N / cm ² , a tensile strength is 500 to 1185 N / cm ² , and an elongation is 500 to 1100. %, And a permanent elongation of 3 to 25% (3 times elongation 70 ° C., 240 Hr) is desirable.

  Next, a method of attaching the covering tube after forming the wire connecting portion using the pair of combination members 10 and 20 for forming the covering tube of the wire connecting portion described above will be described.

[Explanation on how to install the coated tube]
Hereinafter, the preferable first method and second method will be described.

(First method)
In order to attach the covered tube of the present invention, first, two covered electric wires which are electric wire connection targets are prepared. Then, one of the covered electric wires is inserted into the first tubular member 10. The other covered electric wire is inserted into the second cylindrical member 20. Then, the electric wire connection part 50 is formed in the gap | interval which separated the 1st cylindrical member 10 and the 2nd cylindrical member 20. FIG. The electric wire connection portion 50 is formed to have a large diameter, and the maximum outer diameter of the electric wire connection portion 50 is larger than the substantial minimum inner diameter of the coated tube. Therefore, the taper portion T whose inner diameter gradually decreases from the center toward the outside has a structure in which the wire connecting portion 50 having a larger diameter than the outer sheath covering the wire can be locked.

  Thereafter, the first cylindrical member and the second cylindrical member are combined. That is, after the other end 11b of the first cylindrical elastic body 11 is placed in the large-diameter core member 26, the first small-diameter core member 15, the second small-diameter core member 25, and the large-diameter core member. 26 is removed. By removing the large-diameter core member 26, the outer diameter portion of the other end portion 11b of the first cylindrical elastic body molding 11 becomes the inner diameter portion of the other end portion 21b of the second cylindrical elastic body molding 21. To be fitted. By removing the first small-diameter core member 15 and the second small-diameter core member 25, one end 11a of the first cylindrical elastic body molding 11 and one end of the second cylindrical elastic body molding 21 are obtained. 21a is closely_contact | adhered with the outer skin | cover which has coat | covered the electric wire.

  In addition, in order for the fitting part of the other end part 11b of the 1st cylindrical elastic body molding 11 and the other end part 21b of the 2nd cylindrical elastic body molding 21 to have a certain amount of strength, Both elastic bodies to be used are preferably designed such that the hardness JISA is 40 or more, particularly 50 or more, and the thickness is 8 mm or more, particularly 10 mm or more.

(Second method)
First, the two covered electric wires which are electric wire connection objects are prepared first. Then, one of the covered electric wires is inserted into the first tubular member 10. The other covered electric wire is inserted into the second cylindrical member 20. Then, the electric wire connection part 50 is formed in the gap | interval which separated the 1st cylindrical member 10 and the 2nd cylindrical member 20. FIG. The electric wire connection portion 50 is formed to have a large diameter, and the maximum outer diameter of the electric wire connection portion 50 is larger than the substantial minimum inner diameter of the coated tube.

  Then, the 1st cylindrical member 10 or the 2nd cylindrical member 20 is visually aligned so that the electric wire connection part 50 may become the center of a covering tube. The first small diameter core member 15 or the second small diameter core member 25 of the aligned first cylindrical member 10 or second cylindrical member 20 is removed. Thereafter, the first cylindrical member 10 and the second cylindrical member 20 are combined, and the remaining first small-diameter core member 15 or second small-diameter core member 25 and large-diameter core member 26 are removed. In this method, the position of the wire connecting portion 50 to the center of the coated tube can be easily and reliably performed.

  As can be seen from the above description, the present invention is a pair of wire-connecting-tube forming tubes used when the maximum outer diameter of the wire connecting portion is larger than the substantially minimum inner diameter of the covering tube. It is a combination member, and the pair of combination members includes a first tubular member and a second tubular member, and the first tubular member is a first tubular elastic body molded product. And a first small-diameter core member that is mounted in an opening at one end thereof and has a diameter-expanding action, and the second cylindrical member includes a second cylindrical elastic body molding, A first small-diameter core having a second small-diameter core member mounted in the opening at the end and having a diameter-expanding action; and a large-diameter core member mounted in the opening at the other end and having a diameter-expanding action. The member, the second small-diameter core member, and the large-diameter core member are mounted so as to cover the wire connection portion. When the large-diameter core member is removed, an outer diameter portion of the other end portion of the first cylindrical elastic body molded product becomes the second cylindrical elastic body molded product. One end of the first cylindrical elastic body molded product is removed by removing the first small-diameter core member and the second small-diameter core member. And one end of the second cylindrical elastic body molding is configured to be in close contact with the outer skin covering the electric wire, so that the coating operation of the coated tube is unprecedented. It is easy to perform so-called diameter expansion work, has good adhesion to the outer surface of the wire sheath after removing the core element, and can easily and reliably position the wire connecting portion at the center of the coated tube. An effect is produced.

  It can utilize for the technique regarding the covering tube for performing a moisture-proof, electrical insulation, and a mechanical protection process to the connection part of an electric wire.

FIG. 1 shows a cross-sectional view of a cylindrical elastic body molding that is a base member of a pair of combination members for forming a coated tube. FIG. 2 shows a half-sectional view of a pair of combination members for forming a coated tube in an electric wire connecting portion. FIG. 3 is a half-sectional view showing a state after the covering tube is attached.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... 1st cylindrical member 11 ... 1st cylindrical elastic body molding 15 ... 1st small diameter core member 20 ... 2nd cylindrical member 21 ... 2nd cylindrical elastic body molding 25 ... 2nd small diameter Core member 26 ... large-diameter core member

Claims (9)

A pair of combination members for forming a coated tube of a wire connection portion used when the maximum outer diameter of the wire connection portion is larger than the substantially minimum inner diameter dimension of the coated tube,
The pair of combination members includes a first tubular member and a second tubular member,
The first cylindrical member has a first cylindrical elastic body molded article and a first small-diameter core member that is mounted in an opening at one end thereof and has a diameter expanding action,
The second cylindrical member is attached to a second cylindrical elastic body molded article, a second small-diameter core member having a diameter-expanding action that is attached in an opening at one end thereof, and an opening at the other end. A large-diameter core member having a diameter-expanding action,
The first cylindrical elastic body molding is a cylindrical body in which one end portion constitutes a minimum inner diameter (D1min) and the other end portion constitutes a maximum inner diameter (D1max), and the minimum inner diameter (D1min) The first small-diameter core member is inserted into the opening on the side)
The second cylindrical elastic body molding is a cylindrical body in which one end portion constitutes a minimum inner diameter (D2min) and the other end portion constitutes a maximum inner diameter (D2max), and the minimum inner diameter (D2min) ) The second small-diameter core member is inserted in the opening on the side, and the large-diameter core member is inserted in the opening on the maximum inner diameter (D2max) side,
Each of the first small-diameter core member and the second small-diameter core member has an inner diameter larger than the outer diameter of the outer skin covering the electric wire,
The inner diameter of the large-diameter core member is set to be larger than the outer diameter of the other end portion of the first cylindrical elastic body molded product, and the other end portion of the first cylindrical elastic body molded product. Can be installed in the large-diameter core member,
The first small-diameter core member, the second small-diameter core member, and the large-diameter core member can be removed when being mounted so as to cover the electric wire connection portion, and by removing the large-diameter core member, the first An outer diameter portion of the other end portion of the one cylindrical elastic body molding is fitted to an inner diameter portion of the other end portion of the second cylindrical elastic body molding, By removing the first small-diameter core member and the second small-diameter core member, one end of the first cylindrical elastic body molding and one end of the second cylindrical elastic body molding are A pair of combination members for forming a coated tube of an electric wire connecting portion, wherein the pair is formed in close contact with a covering outer skin.   In the lumen part of the first cylindrical elastic body molding and the second cylindrical elastic body molding (excluding one end part in close contact with the outer skin covering the electric wire) In the form, a tapered portion whose inner diameter gradually decreases from the center toward the outside is formed, and a wire connecting portion having a larger diameter than the outer skin covering the electric wire can be locked to the tapered portion. A pair of combination members for forming a covered tube of the electric wire connecting portion according to claim 1.   Each of the first cylindrical elastic body molding and the second cylindrical elastic body molding has a minimum inner diameter region that can be in close contact with the outer sheath of the wire coating on one end side, and a second inner end that is connected to the other end. A first taper region extending toward the first taper region, a first substantially straight region connected to the first taper region, a second taper region connected to the substantially straight region and extending toward the other end, and A pair of combination members for forming a coated tube for a wire connection portion according to claim 1 or 2, wherein the pair of combination members are configured to have a second substantially straight region connected to the second tapered region.   The first small-diameter core member and the second small-diameter core member are inserted into the inner cavities of the minimum inner diameter regions of the first cylindrical elastic body molding and the second cylindrical elastic body molding, respectively. The covered tube formation for a wire connecting portion according to claim 3, wherein when the minimum inner diameter region is expanded, the outer diameter of the minimum inner diameter region and the outer diameter of the first substantially straight region become substantially the same outer diameter. A pair of combination members for use.   5. The wire connecting portion according to claim 1, wherein the first cylindrical elastic body molded product and the second cylindrical elastic body molded product are made of an electrically insulating material. A pair of combination members for forming a coated tube. The first cylindrical elastic body molding and the second cylindrical elastic body molding are made of a rubber material, and the rubber material has a 200% modulus of 100 to 215 N / cm ² and a tensile strength of 500 to 500. 1185N / cm ^2, elongation from 500 to 1100%, the permanent elongation from 3 to 25% (3 times stretching 70 ° C., 240 hours) the wire connecting portion according to any one of claims 1 to 5 comprising comprises the physical properties of A pair of combination members for forming a coated tube. A method of attaching a covering tube after forming a wire connecting portion using a pair of combination members for forming a covering tube of a wire connecting portion according to any one of claims 1 to 6,
The method
Two covered electric wires to be connected are prepared, one covered electric wire is inserted into the first tubular member, the other covered electric wire is inserted into the second cylindrical member, and the first Forming a wire connecting portion with a gap separating the cylindrical member and the second cylindrical member, and then combining the first cylindrical member and the second cylindrical member, and the first small-diameter core member and A method for attaching a coated tube, wherein the second small-diameter core member and the large-diameter core member are removed. A method of attaching a covering tube after forming a wire connecting portion using a pair of combination members for forming a covering tube of a wire connecting portion according to any one of claims 1 to 6,
The method
Two covered electric wires to be connected are prepared, one covered electric wire is inserted into the first tubular member, the other covered electric wire is inserted into the second cylindrical member, and the first After forming the electric wire connection portion with a gap separating the cylindrical member and the second cylindrical member, the first cylindrical member or the second cylindrical shape so that the electric wire connection portion becomes the center of the coated tube. The members are aligned, the first small-diameter core member or the second small-diameter core member of the aligned first cylindrical member or second cylindrical member is removed, and then the first cylindrical member and the second cylindrical member are removed. And the remaining first small-diameter core member or second small-diameter core member and the large-diameter core member are removed.   A covered tube of an electric wire connecting portion formed by combining and integrating a pair of combination members for forming a covered tube of an electric wire connecting portion according to any one of claims 1 to 6.

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