Insulating cap, mounting jig for insulating cap, and connection structure

Abstract

To reduce the workload involved in attaching connection terminals to electric wires and cables.SOLUTION: An insulating cap 4 is a cylindrical cap that covers the area from a connection tube portion 32 of a connection terminal 3 attached to the connection end of an electric wire / cable 2 having a conductor 21 covered with a covering layer 22 to the covering layer 22 of the electric wire / cable 2, and includes a protrusion 44 that is pressed against the covering layer 22 on the inside of the end portion 402 on the covering layer side. The protrusion may be in the form of a projection or a convex stripe, and the axial arrangement can be adjusted as appropriate. It may also be a divided convex stripe.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an insulating cap, an insulating cap mounting jig, and a connection structure. [Background technology]

[0002] When connecting the conductors of electric wires and cables to terminal blocks, breakers, and other equipment inside a panel, the connection is usually made after attaching a connection terminal to the end of the conductor. When attaching a connection terminal to a conductor of an electric wire or cable, the conductor is inserted into the connecting tube of the connection terminal, and the connecting tube together with the inserted conductor of the electric wire or cable is crimped with a die to establish an electrical and mechanical connection. Then, a cylindrical insulating cap that was attached in advance to the outer periphery of the retracted position, which is behind the connection end of the electric wire / cable, was moved toward the connection end, so that the connection cylindrical portion of the crimped connection terminal was covered with the cylindrical insulating cap (see, for example, Patent Documents 1 and 2, etc.). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6422003 [Patent Document 2] Japanese Patent Application Publication No. 6-111863 Summary of the Invention [Problem to be solved by the invention]

[0004] When attaching a connection terminal to an electric wire or cable with its connection end hanging down, it is necessary to first move the insulating cap to a position slightly above the connection end of the electric wire or cable. In this case, if the insulating cap slides downward, it will interfere with the work of attaching the connection terminal to the connection end, so the insulating cap has been secured in an upward retreat position with adhesive tape or the like.

[0005] However, when there are a large number of wires or cables to which connection terminals need to be attached, the tasks of taping the insulating caps and peeling off the tape become a heavy burden, which creates a problem.

[0006] An object of the present invention is to reduce the workload involved in attaching a connection terminal to an electric wire or cable. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides A cylindrical insulating cap having insulating properties that covers a connection end of an electric wire / cable, the connection end being covered with a covering layer, from a connection tube portion of a connection terminal attached to the connection end of the electric wire / cable, the connection end being covered with a covering layer, to the covering layer of the electric wire / cable, The inner end of the coating layer has a protrusion that is pressed against the coating layer.

[0008] The present invention also provides a method for producing a method for manufacturing a semiconductor device comprising the steps of: A mounting jig for a cylindrical insulating cap having insulating properties that covers a connection end of an electric wire / cable having a conductor covered with a covering layer from a connection tube portion of a connection terminal attached to the connection end of the electric wire / cable to a covering layer of the electric wire / cable, The insulating cap is characterized in that it has an insertion wedge shape that is inserted between the insulating cap and the coating layer.

[0009] The present invention also provides a method for producing a method for manufacturing a semiconductor device comprising the steps of: A mounting jig for a cylindrical insulating cap that covers a portion of a connection terminal attached to a connection end of an electric wire / cable having a conductor covered with a covering layer, the portion covering the connection end of the electric wire / cable, the portion including: a plurality of wedges interposed between the insulating cap and the coating layer; The present invention is characterized in that it has a support portion that supports the plurality of wedge-shaped portions and is annular and has dividing portions that are discontinuous in the circumferential direction.

[0010] The present invention also provides a method for producing a method for manufacturing a semiconductor device comprising the steps of: A mounting jig for a cylindrical insulating cap that covers a portion of a connection terminal attached to a connection end of an electric wire / cable having a conductor covered with a covering layer, the portion covering the connection end of the electric wire / cable, the portion including: The insulating cap is characterized in that it is annular having a circumferentially discontinuous divided portion, and fastening is performed on the outer peripheral surface of the insulating cap toward the center of the electric wire / cable.

[0011] The present invention also provides a method for producing a method for manufacturing a semiconductor device comprising the steps of: A connection structure including a connection end of an electric wire / cable having a conductor covered with a covering layer, a connection terminal attached to the connection end, and a cylindrical insulating cap having insulating properties covering the connection end from a connection tube portion of the connection terminal to the covering layer of the electric wire / cable, The insulating cap has a protrusion on an inner side of an end portion on the coating layer side, The diameter of an inscribed circle of the protrusion inside the insulating cap is smaller than the outer diameter of the coating layer. Effect of the Invention

[0012] According to the present invention, it is possible to reduce the workload involved in attaching a connection terminal to an electric wire or cable. [Brief description of the drawings]

[0013] [Figure 1] 1 is an axial cross-sectional view of a connection structure between an electric wire / cable and a connection terminal according to a first embodiment. [Diagram 2] FIG. 4 is an axial cross-sectional view of the insulating cap. [Diagram 3] FIG. [Figure 4] FIG. 4 is a rear view of the insulating cap as viewed from the holding end portion. [Diagram 5] 11 is an axial cross-sectional view showing an example in which the axial arrangement of each protrusion is changed. FIG. [Figure 6] 13 is a perspective view of an insulating cap showing an example in which the axial arrangement of each protrusion is changed. FIG. [Figure 7]10 is a partial cross-sectional view of an insulating cap illustrating a state in which a tip of a holding side end of the insulating cap is in sliding contact with an outer circumferential surface of a coating layer. FIG. [Figure 8] FIG. 11 is a perspective view of a jig used when manufacturing an insulating cap by dipping processing. [Figure 9] 5A and 5B are partial cross-sectional views showing a state during manufacture of the insulating cap. [Figure 10] FIG. 11 is a perspective view of an insulating cap according to a second embodiment. [Figure 11] FIG. 2 is an axial cross-sectional view of an insulating cap and an electric wire / cable. [Figure 12] FIG. 12 is an enlarged cross-sectional view of the insulating cap in region P of FIG. [Figure 13] 13 is a perspective view of an insulating cap showing an example in which the axial arrangement of the protrusions is changed. FIG. [Figure 14] 13 is a perspective view showing an example in which a recessed notch is provided at the holding side end of the second cylindrical portion of the insulating cap. FIG. [Figure 15] FIG. 11 is a perspective view of an insulating cap according to a third embodiment. [Figure 16] FIG. 2 is an axial cross-sectional view of an insulating cap attached to an electric wire / cable. [Figure 17] FIG. 13 is a perspective view of an insulating cap according to a fourth embodiment. [Figure 18] FIG. 2 is an axial cross-sectional view of an insulating cap and an electric wire / cable. [Figure 19] 13 is a perspective view of an insulating cap in which a notch is formed in a holding side end of a second cylindrical portion of the insulating cap to divide a protrusion. FIG. [Figure 20] 11 is a perspective view of an insulating cap showing an example in which a convex portion is formed on a tapered surface formed on a holding side end portion of a second cylindrical portion of the insulating cap. FIG. [Figure 21] FIG. 11 is an axial cross-sectional view of an insulating cap according to a fifth embodiment. [Figure 22] 22 is an enlarged cross-sectional view of the area surrounded by the dashed dotted line circle in FIG. 21. [Figure 23] FIG. 4 is an enlarged perspective view of a holding end of the insulating cap; [Figure 24]5 is an axial cross-sectional view showing the movement of a protrusion when the insulating cap is attached to an electric wire or cable. FIG. [Diagram 25] FIG. 4 is an axial cross-sectional view of the insulating cap after it has been attached to an electric wire / cable. [Figure 26] 26 is an enlarged cross-sectional view of the area surrounded by the dashed dotted circle in FIG. 25. [Figure 27] 4 is an axial cross-sectional view of a jig and a mold used in molding to form the insulating cap. FIG. [Figure 28] 28 is an enlarged cross-sectional view of the area surrounded by the dashed dotted circle in FIG. 27. [Figure 29] FIG. 13 is a perspective view of an insulating cap mounting jig, an insulating cap, and an electric wire / cable according to a sixth embodiment. [Diagram 30] FIG. 2 is an axial cross-sectional view of an insulating cap attached to an electric wire / cable. [Diagram 31] FIG. 13 is a perspective view of an insulating cap mounting jig, an insulating cap, and electric wires and cables according to a seventh embodiment. [Diagram 32] FIG. [Diagram 33] FIG. 2 is an axial cross-sectional view of an insulating cap attached to an electric wire / cable. [Diagram 34] FIG. 13 is a perspective view of an insulating cap mounting jig, an insulating cap, and an electric wire / cable according to an eighth embodiment. [Diagram 35] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, various embodiments of the connection structure between an electric wire / cable and a connection terminal according to the present invention and related configurations will be described with reference to the drawings. However, each of the embodiments described below is subject to various technically preferable limitations for carrying out the present invention, but the scope of the present invention is not limited to each of the following embodiments or illustrated examples. In the following description, the direction of the center line of an electric wire or cable is referred to as the "axial direction", the circumferential direction around the center line is referred to as the "circumferential direction", and the direction perpendicular to the center line is referred to as the "radial direction".

[0015] [First embodiment] FIG. 1 is an axial cross-sectional view of a connection structure 10 between an electric wire / cable 2 and a connection terminal 3 according to a first embodiment, FIG. 2 is an axial cross-sectional view of an insulating cap 4 attached to the electric wire / cable 2, and FIG. 3 is a perspective view of the insulating cap 4. As shown in the figure, the connection structure 10 has a connection end of an electric wire / cable 2, a connection terminal 3 attached to the connection end, and a cylindrical insulating cap 4 that covers from the connection tubular portion of the connection terminal 3 to the coating layer of the electric wire / cable 2.

[0016] [Wires and cables] The electric wire / cable 2 is formed by covering a conductor 21 with a covering layer 22 . Copper or a copper alloy, or aluminum or an aluminum alloy, is used as the material of the conductor 21 of the electric wire / cable 2. The conductor 21 is formed by twisting together a plurality of wires made of the above-mentioned materials. The covering layer 22 is made of an insulating material (e.g., cross-linked polyethylene, ethylene propylene rubber, polyvinyl chloride). The covering layer 22 covers the entire outer periphery of the conductor 21 over the entire length. The covering layer 22 may be made of two layers, an insulating layer and a protective layer on the outside of the insulating layer. However, when attaching the connection terminal 3 to the electric wire / cable 2, the covering layer 22 is peeled off and removed at the connection end over an approximately predetermined length, leaving the conductor 21 exposed over a predetermined length.

[0017] [Connection terminal] The connection terminal 3 has a connection portion 31 at one end for electrically connecting the conductor 21 of the electric wire / cable 2 to a connection destination such as a terminal block, and a connection tube portion 32 at the other end into which the conductor 21 of the electric wire / cable 2 is inserted.

[0018] The connection terminal 3 is integrally formed as a whole from copper or a copper alloy, or aluminum or an aluminum alloy. The metal material of the connection terminal 3 may be the same as that of the conductor 21 of the electric wire / cable 2, or may be a different metal. For example, both may be copper or a copper alloy, or aluminum or an aluminum alloy. Alternatively, one may be copper or a copper alloy and the other may be aluminum or an aluminum alloy. The connected portion 31 has a rectangular flat plate shape extending in the axial direction away from the connecting tube portion 32, and has a circular hole in the center for passing a screw through and fastening to the target connection location.

[0019] The connection tube portion 32 is a cylinder having a constant inner diameter and outer diameter, and its end on the side of the connected portion 31 is closed. The inner diameter of the connection tube portion 32 is set to be slightly larger than the outer diameter of the conductor 21 of the electric wire / cable 2, allowing the conductor 21 to be easily inserted. With the conductor 21 inserted, the connection tube portion 32 is crimped by compression or crimping from the outside to connect the conductor 21 of the electric wire / cable 2 to the connection terminal 3. When the connection tube portion 32 is crimped and connected to the conductor 21, its outer diameter is larger than the outer diameter of the covering layer 22 of the electric wire / cable 2.

[0020] [Insulating cap] The insulating cap 4 is a tubular body that covers from the connection tube portion 32 of the connection terminal 3 attached to the connection end of the electric wire / cable 2 to the covering layer 22 of the electric wire / cable 2. The insulating cap 4 is made of an insulating material (for example, polyvinyl chloride, ethylene propylene rubber, silicone rubber, or other insulating resin).

[0021] 1 to 3, the insulating cap 4 has a first tubular portion 41 on the connection terminal 3 side, a second tubular portion 42 on the electric wire / cable 2 side, and a transition portion 43 located therebetween. The first tubular portion 41, the transition portion 43, and the second tubular portion 42 are formed concentrically and integrally. In addition, both ends of the insulating cap 4 in the axial direction are open. Hereinafter, the end of the insulating cap 4 on the connection terminal 3 side will be referred to as the "coating side end" (reference number 401), and the end on the electric wire / cable 2 side will be referred to as the "holding side end" (reference number 402). The same applies to the other insulating caps 4A to 4F described later.

[0022] The first tubular portion 41 is a cylinder having a constant inner diameter and outer diameter. The inner diameter of the first tubular portion 41 is equal to or slightly smaller than the outer diameter of the circumscribing circle of the connection tubular portion 32 of the connection terminal 3 in a state where it is crimped and connected to the conductor 21 (hereinafter, referred to as the connection tubular portion 32 after the connection process). However, the inner diameter of the first tubular portion 41 may be slightly larger than the outer diameter of the circumscribing circle of the connection tubular portion 32 after the connection process. Also, the inner diameter of the first tubular portion 41 may be equal to or slightly smaller than the outer diameter of the connection tubular portion 32 before crimping.

[0023] Since the insulating cap 4 is generally flexible and elastic, the first tubular portion 41 can be easily placed over the connecting tubular portion 32 after the connection process. The axial length of the first tubular portion 41 may be approximately equal to the axial length of the connecting tubular portion 32 or may be slightly longer. In addition, the tip of the covering side end 401 of the first cylindrical portion 41 may be formed into a somewhat tapered shape by reducing the inside and outside diameters.

[0024] The second tubular portion 42 is a cylindrical body having constant inner and outer diameters. The inner diameter of the second tubular portion 42 is set to be slightly larger than the outer diameter of the covering layer 22 of the electric wire / cable 2, so that the second tubular portion 42 can be easily placed over the covering layer 22.

[0025] The transition portion 43 has one end connected to the first cylindrical portion 41 and the other end connected to the second cylindrical portion 42 . The inner and outer diameters of one end of the transition portion 43 match those of the first cylindrical portion 41, and the inner and outer diameters of the other end match those of the second cylindrical portion 42. The inner and outer diameters of the transition portion 43 gradually decrease from one end to the other end. Therefore, the outer peripheral surface of the transition portion 43 is a conical surface when viewed from the outside, and the inner peripheral surface is a conical surface when viewed from the inside.

[0026] Near the holding side end 402 of the second cylindrical portion 42, one or more (preferably three or more, four are illustrated here) protrusions 44 are provided on the inner circumferential surface thereof. The protrusions 44 are hemispherical protrusions and are arranged on the same circumference at uniform intervals in the circumferential direction. However, the shape of the axial cross section of the protrusions 44 may be any shape that protrudes toward the coating layer 22, and the protrusions 44 are not limited to being hemispherical. As shown in FIG. 4, the diameter D of the inscribed circle C 1 of the four protrusions 44 is set to be slightly smaller than the outer diameter of the covering layer 22 of the electric wire / cable 2 . Therefore, as shown in FIG. 2, when the electric wire / cable 2 is passed through the insulating cap 4, the tip end of each protrusion 44 is pressed against the outer circumferential surface of the coating layer 22 in a point contact state.

[0027] In addition, the protrusion 44 can be functional with at least one protrusion 44. In that case, the diameter D of the inscribed circle between the tip of the protrusion 44 and the inner surface of the second tubular portion 42 is set to be slightly smaller than the outer diameter of the coating layer 22 of the electric wire / cable 2.

[0028] [Installation of insulating cap] The operation of attaching the insulating cap 4 in connection with the operation of connecting the electric wire / cable 2 and the connection terminal 3 will be described. For example, it is assumed that the electric wire / cable 2 has already been installed in a hanging state with the connection end side facing downward. At the connection end of the electric wire / cable 2, a predetermined length of the covering layer 22 is removed to expose the conductor 21.

[0029] Before or after this, the connection end of the electric wire / cable 2 is inserted from the holding side end 402 of the insulating cap 4. At this time, in order not to interfere with the operation of connecting the connection terminal 3 to the connection end of the electric wire / cable 2, the insulating cap 4 is attached at a position where the entire insulating cap 4 is somewhat separated from the connection end of the electric wire / cable 2, as shown in Fig. 2. This position is the standby position of the insulating cap 4. At this time, the connection end of the electric wire / cable 2 is facing downward, and the insulating cap 4 in the standby position is subjected to a downward gravitational load. However, since the four protrusions 44 are in a state of being pressed against the outer circumferential surface of the coating layer 22, the insulating cap 4 maintains its standby position and is prevented from falling off the connection end of the electric wire / cable 2.

[0030] Then, the conductor 21 of the connection end of the electric wire / cable 2 is inserted into the connection tube portion 32 of the connection terminal 3. Furthermore, the connection tube portion 32 is crimped from the outside by compression or crimping, so that the connection terminal 3 and the conductor 21 of the electric wire / cable 2 are mechanically and electrically connected to each other. Thereafter, the insulating cap 4 that was in the standby position is moved toward the connection end of the electric wire / cable 2 against the frictional force caused by the pressure contact of each protrusion 44, and the first tubular portion 41 is placed over the connection tubular portion 32 of the connection terminal 3. As a result, the insulating cap 4 covers from the connection tube portion 32 to the covering layer 22 of the electric wire / cable 2 . As a result, a connection structure 10 consisting of the electric wire / cable 2, the connection terminal 3 and the insulating cap 4 is formed.

[0031] [Technical effect of the first embodiment] In the above connection structure 10, the insulating cap 4 has a protrusion 44 on the inside of the holding side end 402, which is in pressure contact with the coating layer 22. Therefore, during the operation of connecting the electric wire / cable 2 and the connection terminal 3, even if the connection end of the electric wire / cable 2 is facing downward, the convex portion 44 holds the coating layer 22, effectively preventing the insulating cap 4 from slipping downward from the standby position or falling off from the connection end of the electric wire / cable 2. Therefore, the connection work between the electric wire / cable 2 and the connection terminal 3 is not hindered, and since temporary fixing of the insulating cap 4 with adhesive tape is not required, the connection work is facilitated and the work efficiency is improved.

[0032] Moreover, the insulating cap 4 has a structure in which the second cylindrical portion 42, which is the end portion on the coating layer 22 side, has a smaller inner diameter than the first cylindrical portion 41 on the connecting cylindrical portion 32 side. As a result, the first tubular portion 41, which has a large inner diameter, can be fitted comfortably over the connection tubular portion 32 of the connection terminal 3 connected to the conductor 21 of the electric wire / cable 2, making it easier to install the insulating cap 4 and enabling the connection tubular portion 32 to be well covered. In particular, when the connection tubular portion 32 of the connection terminal 3 is crimped, the cross-sectional shape of the outer periphery may be deformed from a circular shape, but even with such a deformed connection tubular portion 32, the first tubular portion 41 of the insulating cap 4 can be easily placed over it, making it possible to adequately cover the connection tubular portion 32.

[0033] In addition, since each convex portion 44 of the insulating cap 4 is in the form of a protrusion that makes point contact with the coating layer 22, pressure is concentrated over a small area, resulting in high holding ability and enabling the insulating cap 4 to be effectively held against the electric wire / cable 2.

[0034] [Other arrangements of protrusions] As shown in Figs. 5 and 6, each of the protrusions 44 may be formed at a position on the inner circumferential surface of the second cylindrical portion 42 that is closest to the tip end of the holding side end portion 402 in the axial direction. If each protrusion 44 is provided at a certain distance from the holding end 402, when the electric wire / cable 2 is inserted from the holding end 402, as shown in FIG. 7, the tip side of the holding end 402 rather than each protrusion 44 may come into sliding contact with the outer circumferential surface of the covering layer 22 of the electric wire / cable 2, causing friction and making it difficult to attach the electric wire / cable 2. However, as shown in Figures 5 and 6, when each convex portion 44 is provided at the tip-most position of the holding side end 402 of the second tubular portion 42, when the electric wire / cable 2 is inserted from the holding side end 402, there is no portion that comes into sliding contact with the coating layer 22 of the electric wire / cable 2, and therefore the attachment can be performed smoothly.

[0035] [Insulating cap manufacturing] A method for manufacturing the insulating cap 4 will now be described. The insulating cap 4 can be manufactured by dipping. Fig. 8 is a perspective view of a jig G used in the dipping process, and Fig. 9 is a partial cross-sectional view showing the state of the insulating cap 4 during manufacturing.

[0036] 8, the jig G of the insulating cap 4 is a rod-like body having the same shape as the internal space of the insulating cap 4. The jig G has portions corresponding to the inner circumferential surfaces of the first cylindrical portion 41, the second cylindrical portion 42, and the transition portion 43, and is also formed with a recess G1 corresponding to the protrusion 44 in the second cylindrical portion 42. First, a release agent is applied to the outer peripheral surface of the jig G, and the outer peripheral surface of the jig G is immersed in a dip tank in which the resin from which the insulating cap 4 is formed is in a molten state, for example, with the portion corresponding to the inner peripheral surface of the second cylindrical portion 42 being lower than the portion corresponding to the inner peripheral surface of the first cylindrical portion 41 of the jig G. Thereafter, when the jig G is pulled out of the dipping tank, the resin material is attached to its outer peripheral surface as shown in Fig. 9, and this is cooled, and air is blown between the jig G and the resin material to separate it, and the cylindrical resin material is peeled off from the jig G. Then, the upper and lower ends of the resin material are cut at predetermined positions, and the insulating cap 4 is completed.

[0037] In addition, when the axial position of the convex portion 44 relative to the holding side end portion 402 is different, such as between the insulating cap 4 shown in Figure 2 and the insulating cap 4 shown in Figure 5, it is possible to adjust it appropriately by changing the cutting position for forming the holding side end portion 402 in the tubular resin material after demolding.

[0038] [Second embodiment] 10 is a perspective view of an insulating cap 4A according to a second embodiment, FIG. 11 is an axial cross-sectional view of the insulating cap 4A attached to an electric wire / cable 2, and FIG. 12 is an enlarged cross-sectional view of the insulating cap 4A in region P in FIG. The second embodiment illustrates an insulating cap 4A having a different configuration from the previously described insulating cap 4. The electric wire / cable 2 and the connection terminal 3 constituting the connection structure together with the insulating cap 4A are the same as the electric wire / cable 2 and the connection terminal 3 of the previously described connection structure 10.

[0039] The insulating cap 4A has a different structure from the protrusion 44 in that the structure of the protrusion 44A that is pressed against the covering layer 22 of the electric wire / cable 2 is different, and the other structure is the same as that of the insulating cap 4. Therefore, the same reference numerals as those of the insulating cap 4 are used for the same components of the insulating cap 4A. Unlike the previously described protrusion 44 which has a point contact with the coating layer 22, the protrusion 44A of the insulating cap 4A is a protruding stripe that runs around the circumferential direction of the inner surface of the second cylindrical portion 42. As shown in FIG. 12, the shape of the axial cross section of the protrusion 44A is not limited as long as it protrudes toward the coating layer 22, but a semicircular shape is exemplified here. The inner diameter of the innermost periphery of the protrusion 44A is equal to or slightly smaller than the outer diameter of the coating layer 22.

[0040] The procedure for attaching the insulating cap 4A is the same as that for the insulating cap 4 described above. Since the convex portion 44A of the insulating cap 4A is a circumferentially extending convex stripe, the insulating cap 4A can hold the coating layer 22 from all around and more effectively prevents the insulating cap 4A from slipping downward from the standby position or from falling off the connection end of the electric wire / cable 2. Therefore, the insulating cap 4A does not hinder the connection work of the electric wire / cable 2 and the connection terminal 3, and also makes the connection work easier by eliminating the need for adhesive tape, thereby contributing to improved work efficiency. Other technical effects are the same as those of the insulating cap 4.

[0041] Also, in the case of the insulating cap 4A, as shown in FIG. 13, a protrusion 44A may be formed at a position on the inner circumferential surface of the second cylindrical portion 42 that is closest to the tip of the holding side end 402 in the axial direction. In the case of the insulating cap 4A as well, when the electric wire / cable 2 is inserted from the holding end 402, there is no portion that comes into sliding contact with the covering layer 22 of the electric wire / cable 2, and therefore attachment can be performed smoothly.

[0042] In addition, the convex portion 44A made of a ridge is not limited to a continuous configuration around the circumference, and may be discontinuous in the circumferential direction. For example, as shown in Fig. 14, a plurality of rectangular recessed notches 45A toward the covering side end 401 side may be formed at uniform intervals in the circumferential direction in the holding side end 402 of the second cylindrical portion 42 of the insulating cap 4A, thereby dividing the convex portion 44A of the ridge into the same number as the notches 45A. In this case as well, the protrusion 44A may be formed at a position on the holding side end 402 of the second cylindrical portion 42 that is closest to the tip end.

[0043] In this way, the convex portion 44A divided into multiple parts exerts a reduced force on the covering layer 22 of the electric wire / cable 2 compared to the convex portion 44A of a continuous ridge that goes around the circumference, but if the rigidity of the divided second tubular portion 42 that supports the divided convex portion 44A is sufficient to generate a sufficient frictional force between the convex portion 44A and the covering layer 22 to sufficiently restrain the insulating cap 4A, then such a divided structure is not a problem. Also, if the convex portion 44A of the ridge is divided, excessive frictional force is not generated when the insulating cap 4A is attached to the electric wire / cable 2, making it easier to move the insulating cap 4A relative to the electric wire / cable 2, improving workability when forming a connection structure.

[0044] The insulating cap 4A is manufactured in the same manner as the insulating cap 4, except that a groove is formed on the outer peripheral surface of the jig G along the circumferential direction to form the protruding portion 44A having a ridge shape. In addition, in the case of an insulating cap 4A having a segmented convex portion 44A, after forming an unsegmented insulating cap 4A, a rectangular notch 45A can be formed in the holding side end portion 402 of the second tubular portion 42 by a cutting process.

[0045] [Third embodiment] FIG. 15 is a perspective view of an insulating cap 4B according to the third embodiment, and FIG. 16 is an axial cross-sectional view of the insulating cap 4B attached to an electric wire / cable 2. As shown in FIG. The third embodiment illustrates an insulating cap 4B having a different configuration from the previously described insulating cap 4. The electric wire / cable 2 and the connection terminal 3 constituting a connection structure together with the insulating cap 4B are the same as the electric wire / cable 2 and the connection terminal 3 of the previously described connection structure 10.

[0046] The insulating cap 4B has a different structure from the protrusion 44 in that the structure of the protrusion 44B that is pressed against the covering layer 22 of the electric wire / cable 2 is different, and the other structure is the same as that of the insulating cap 4. Therefore, the same reference numerals as those of the insulating cap 4 are used for the same components of the insulating cap 4B. Unlike the above-described protrusion 44 which is in point contact with the coating layer 22, the protrusion 44B of the insulating cap 4B is formed as a protruding stripe along the axial direction of the second cylindrical portion . The shape of the protrusion 44B in a cross section perpendicular to the axis is not limited as long as it protrudes toward the coating layer 22, but a semicircular shape is exemplified here. In addition, the length of the protrusion 44B is also not limited, but may be, for example, at its longest, equal to the axial length of the second cylindrical portion 42. It is preferable that a plurality of protrusions 44B are provided at equal intervals in the circumferential direction. Here, an example is shown in which four protrusions 44B are provided. The diameter of the inscribed circle at the innermost periphery of each protrusion 44B is slightly smaller than the outer diameter of the coating layer 22.

[0047] The procedure for attaching the insulating cap 4B is the same as that for the insulating cap 4 described above. Since the protruding portion 44B of the insulating cap 4B is long in the axial direction, it is pressed against the covering layer 22 over a long range in the axial direction, and therefore has high holding ability, and the insulating cap 4B can be effectively held against the electric wire / cable 2. Therefore, the connection work between the electric wire / cable 2 and the connection terminal 3 is not hindered, and adhesive tape is not required, which makes the connection work easier and improves the work efficiency. Other technical effects are the same as those of the insulating cap 4.

[0048] The insulating cap 4B is manufactured in the same manner as the insulating cap 4, except that a groove is formed on the outer peripheral surface of the jig G along the axial direction to form the protruding portion 44B of the ridges.

[0049] [Fourth embodiment] FIG. 17 is a perspective view of an insulating cap 4C according to the fourth embodiment, and FIG. 18 is an axial cross-sectional view of the insulating cap 4C and the electric wire / cable 2. As shown in FIG. The fourth embodiment illustrates an insulating cap 4C having a different configuration from the above-described insulating cap 4. The electric wire / cable 2 and the connection terminal 3 constituting a connection structure together with the insulating cap 4C are the same as the electric wire / cable 2 and the connection terminal 3 of the above-described connection structure 10.

[0050] In this insulating cap 4C, the structure of the protrusion 44C that is in pressure contact with the covering layer 22 of the electric wire / cable 2 is similar to that of the above-mentioned protrusion 44A, but the other structure is the same as that of the insulating cap 4. Therefore, the same reference numerals as those of the insulating cap 4 are used for the same components of the insulating cap 4C as those of the insulating cap 4. The protrusion 44C of the insulating cap 4C is located at the tip of the holding side end 402 on the inner circumferential surface of the insulating cap 4C, and is formed as a protruding stripe that runs around the inner circumferential surface of the second cylindrical portion 42 in the circumferential direction. The cross-sectional shape of the protrusion 44C in the axial direction is different from that of the protrusion 44A described above.

[0051] The protrusion 44C is provided at the tip of the holding side end 402 on the inner circumferential surface of the second tubular portion 42, and its axial cross-sectional shape is not semicircular like the protrusion 44A. The cross-sectional shape of the protrusion 44C is a sharp wedge shape at the tip of the holding side end 402. As a result, the protrusion 44C is formed on the inner circumferential surface of the second tubular portion 42 on the tip side of the holding side end 402, with a convex ridge on which a tapered surface 441C in the form of an expanded cone surface whose inner diameter increases toward the tip is formed. The inner diameter of the innermost periphery of the protrusion 44C is equal to or slightly smaller than the outer diameter of the coating layer 22.

[0052] The procedure for attaching the insulating cap 4C is the same as that for the insulating cap 4 described above. Since the convex portion 44C of the insulating cap 4C is a circumferentially extending convex strip, the insulating cap 4C can hold the coating layer 22 from all around and more effectively prevent the insulating cap 4C from slipping downward from the standby position or falling off from the connection end of the electric wire / cable 2. Therefore, the connection work between the electric wire / cable 2 and the connection terminal 3 is not hindered, and adhesive tape is not required, so that the connection work is further facilitated and the work efficiency is further improved. Furthermore, since the protrusion 44C of the insulating cap 4C has a tapered surface 441C, the wire / cable 2 can be easily inserted from the holding end 402 of the insulating cap 4C, improving workability. Other technical effects are the same as those of the insulating cap 4.

[0053] Similarly to the protrusion 44A, the protrusion 44C formed of a ridge is not limited to a continuous configuration around the circumference, and may be discontinuous in the circumferential direction. For example, as shown in Fig. 19, a plurality of rectangular recessed notches 45C facing the covering side end 401 side may be formed at uniform intervals in the circumferential direction in the holding side end 402 of the second cylindrical portion 42 of the insulating cap 4C, thereby dividing the protrusion 44C of the ridge into the same number as the notches 45C. The effect of the division is the same as that of the protrusion 44A described above.

[0054] The insulating cap 4C is manufactured in the same manner as the insulating cap 4, except that a groove is formed on the outer peripheral surface of the jig G along the circumferential direction to form the protruding portion 44C of the ridge shape. In the case of the insulating cap 4C having the divided ridges 44C, the cutting process is carried out in the same manner as in the case of the insulating cap 4A.

[0055] In addition, in the case of the convex portion 44C, the end of the tapered surface 441C closest to the connection terminal 3 has the smallest inner diameter, and the part with the smallest inner diameter is in sliding contact with the coating layer 22 of the electric wire / cable 2, but the present invention is not limited to this. For example, as in an insulating cap 4D shown in Fig. 20, instead of forming a circumferentially encircling convex stripe on the holding side end 402 of the second tubular portion 42, a widened tapered surface 441D may be formed at the tip of the holding side end 402 of the second tubular portion 42, and multiple protruding convex portions 44D protruding radially inward may be formed on the inner peripheral surface of the tapered surface 441D. In this case, the diameter of the inscribed circle of the multiple convex portions 44D is set to be slightly smaller than the outer diameter of the coating layer 22 of the electric wire / cable 2. Also, each convex portion 44D is shaped to make point contact with the coating layer 22. Since the insulating cap 4D having such a protrusion 44D also has a tapered surface 441D, the wire / cable 2 can be easily inserted from the holding end 402 of the insulating cap 4D, improving workability. Other technical effects are the same as those of the insulating cap 4.

[0056] [Fifth embodiment] 21 is an axial cross-sectional view of an insulating cap 4E according to the fifth embodiment, FIG. 22 is an enlarged cross-sectional view of the area within the dashed dotted circle in FIG. 21, and FIG. The fifth embodiment illustrates an insulating cap 4E having a different configuration from the above-described insulating cap 4. The electric wire / cable 2 and the connection terminal 3 constituting the connection structure together with the insulating cap 4E are the same as the electric wire / cable 2 and the connection terminal 3 of the above-described connection structure 10.

[0057] The insulating cap 4E has a plurality of protrusions 44E that are in pressure contact with the covering layer 22 of the electric wire / cable 2, and a plurality of support portions 46E that extend radially inward from the tip of the insulating cap 4E on the covering layer side. Moreover, the insulating cap 4E has the same first cylindrical portion 41, second cylindrical portion 42, and transition portion 43 as the insulating cap 4 described above.

[0058] Each of the protrusions 44E is supported individually by the tip of each of the support portions 46E. 22, the support portion 46E extends radially inward from an inner edge portion of the end face on the holding side end portion 402 side of the second cylindrical portion 42 toward the coating layer 22 side (one side in the axial direction, the coating layer 22 side facing the connection terminal 3), and a protrusion 44E is formed on the extending end portion. The support portion 46E has a thin rectangular shape. The support portion 46E may extend from a tip of the inner circumferential surface of the second tubular portion 42 on the holding side end portion 402 side. The support portion 46E may extend radially inward, and may extend toward the connection terminal 3 side (the other side in the axial direction, the connection terminal 3 side with respect to the covering layer 22) instead of the covering layer 22 side. The support portion 46E may extend radially inward and not incline toward either the covering layer 22 side or the connecting terminal 3 side.

[0059] Since each support portion 46E extends radially inward, when the electric wire / cable 2 is inserted from the holding side end portion 402 of the insulating cap 4E as shown in FIG. 24 , the support portion 46E abuts against the tip portion of the electric wire / cable 2 and is folded back toward the connection terminal 3 inside the holding side end portion 402. Furthermore, when the insulating cap 4E is moved rearward from the connection end of the electric wire / cable 2, as shown in Figures 25 and 26, at the tip of the folded-back support portion 46E, the convex portion 44E is sandwiched between the inner surface of the second tubular portion 42 and the outer surface of the coating layer 22 and is pressed against the coating layer 22.

[0060] Each protrusion 44E is formed with respect to each supporting portion 46E so as to protrude toward the covering layer 22 side with the supporting portion 46E facing the connection terminal 3 side. Moreover, each of the protrusions 44E is a semispherical protrusion, and the protrusions 44E and the support portions 46E are each disposed on the same circumference at uniform intervals in the circumferential direction. Furthermore, when each convex portion 44E is oriented so as to be convex toward the coating layer 22 on the inner surface of the second tubular portion 42, the diameter of the inscribed circle of each convex portion 44E is set to be slightly smaller than the outer diameter of the coating layer 22. The shape of the axial cross section of the protrusion 44E may be any shape that protrudes toward the coating layer 22, and the protrusion 44E is not limited to being hemispherical.

[0061] The procedure for attaching the insulating cap 4E is the same as that for the insulating cap 4 described above. When the electric wire / cable 2 is inserted from the holding end 402 side of the insulating cap 4E, the convex portion 44E faces the coating layer 22 side, and the insulating cap 4E can hold the coating layer 22 from all sides, thereby more effectively preventing the insulating cap 4E from slipping downward from the standby position or falling off from the connection end of the electric wire / cable 2. Therefore, the connection work between the electric wire / cable 2 and the connection terminal 3 is not hindered, and adhesive tape is not required, which makes the connection work easier and improves the work efficiency. Furthermore, since each protrusion 44E is supported by a support portion 46E, when the insulating cap 4E is attached to the electric wire / cable 2, the holding side end portion 402 of the insulating cap 4E is unlikely to be pulled inward, so that the operation of connecting the electric wire / cable 2 and the connection terminal 3 can be performed smoothly, further improving the work efficiency. Other technical effects are the same as those of the insulating cap 4.

[0062] [Insulating cap manufacturing] A method for manufacturing the insulating cap 4E will be described. The insulating cap 4E can be manufactured by molding. Fig. 27 is an axial cross-sectional view of a jig GE and a metal mold ME used in the molding, and Fig. 28 is an enlarged perspective view of the area within the dashed-dotted circle in Fig. 27.

[0063] 27, the jig GE of the insulating cap 4E is a rod-like body having the same shape as the internal space of the insulating cap 4E. The jig GE has portions corresponding to the inner circumferential surfaces of the first cylindrical portion 41, the second cylindrical portion 42, and the transition portion 43, but does not have portions corresponding to each of the protrusions 44E and each of the support portions 46E. The mold ME is a structure consisting of a pair of upper and lower halves divided into upper and lower halves sandwiching a jig GE. The mold ME has a recess for storing the jig GE when the upper and lower halves are joined together, and further has a clearance space for forming the first cylindrical portion 41, the second cylindrical portion 42, and the transition portion 43 of the insulating cap 4E relative to the outer circumferential surface of the jig GE. Furthermore, the jig GE has a conical portion GE2 whose diameter is reduced from the end of a portion corresponding to the inner circumferential surface of the second cylindrical portion 42. In the die ME, a recess corresponding to the conical portion GE2 is formed, and recesses ME1 and ME2 that form gap spaces for forming each of the protrusions 44E and each of the support portions 46E are also formed.

[0064] Each support portion 46E is formed along the outer circumferential surface of the cone-shaped portion GE2 of the jig GE, and thus can be formed in an inclined direction along the coating layer 22 side on the radially inner side. As described above, each support portion 46E does not have to face the coating layer 22 side in the axial direction as long as it faces radially inward, but by configuring each support portion 46E to face in an inclined direction that faces radially inward and axially toward the coating layer 22, it is possible to easily manufacture the support portions 46E by molding using the jig GE and the die ME. For example, if each support portion 46E faces radially inward and in an inclined direction that faces the connection terminal 3 side in the axial direction, a die with a complex configuration is required, which reduces manufacturability. Furthermore, when each support portion 46E is formed in the above-mentioned orientation, after the resin is injected into the mold ME and the material resin hardens, the mold releasability is good, which also makes it possible to improve manufacturability.

[0065] [Sixth embodiment] FIG. 29 is a perspective view of an installation jig GF for an insulating cap 4F according to the sixth embodiment, an insulating cap 4F, and an electric wire / cable 2, and FIG. 30 is an axial cross-sectional view thereof. In the sixth embodiment, an insulating cap 4F does not have a structure for holding the electric wire / cable 2. That is, the insulating cap 4F has a configuration in which all of the protrusions 44 have been removed from the insulating cap 4 described above.

[0066] An installation jig GF suitable for forming a connection structure by the insulating cap 4F, the electric wire / cable 2, and the connection terminal 3 will be described. The mounting jig GF is a substantially rectangular parallelepiped, and is wedge-shaped with a tapered surface GF1 where a corner on one end side is removed, so that the mounting jig GF has a sharpened shape on one end side. The connection structure consisting of the electric wire / cable 2, the connection terminal 3, and the insulating cap 4F is connected in the same procedure as the above-mentioned connection structure consisting of the electric wire / cable 2, the connection terminal 3, and the insulating cap 4. At that time, the electric wire / cable 2 is inserted from the holding side end 402 of the insulating cap 4F, and when the insulating cap 4F is placed in the retracted position, one end of the mounting jig GF with a sharpened shape is inserted between the coating layer 22 and the holding side end 402 of the second tubular portion 42 of the insulating cap 4F. As a result, the inner surface of the second tubular portion 42 of the insulating cap 4F and the mounting jig GF are pressed against the coating layer 22, so that the insulating cap 4F can be held in the retracted position even when the connection end of the electric wire / cable 2 is facing downward. In addition, after the connection terminal 3 is attached to the conductor 21 of the electric wire / cable 2, the mounting jig GF can be pulled out, making it possible to easily move the insulating cap 4F and cover the connection tube portion 32 of the connection terminal 3.

[0067] As described above, the mounting jig GF effectively prevents the insulating cap 4F from moving downward from the standby position or from falling off the connection end of the electric wire / cable 2. Therefore, it is possible to prevent the insulating cap 4F from interfering with the connection work of the electric wire / cable 2 and the connection terminal 3. Furthermore, the mounting jig GF can be inserted and removed simply by inserting it into and removing it from the gap between the coating layer 22 and the second tubular portion 42 of the insulating cap 4F, eliminating the need for adhesive tape, making the connection work easier and improving work efficiency. In addition, the mounting jig GF can be reused over and over again, making it more economical than adhesive tape.

[0068] The attachment jig GF may have a contact surface on the covering layer 22 side that has a concave peripheral shape corresponding to the peripheral shape of the covering layer 22. Also, a projection for removal may be provided on the end of the mounting jig GF opposite to the sharp end.

[0069] The attachment jig GF may have a contact surface on the covering layer 22 side that has a concave peripheral shape corresponding to the peripheral shape of the covering layer 22. Also, a projection for removal may be provided on the end of the mounting jig GF opposite to the sharp end.

[0070] [Seventh embodiment] Figure 31 is an oblique view of an installation jig GG for an insulating cap 4F of the seventh embodiment, the insulating cap 4F, and an electric wire / cable 2, Figure 32 is an oblique view of the installation jig GG, and Figure 33 is an axial cross-sectional view of the insulating cap 4F attached to the electric wire / cable 2. The seventh embodiment, like the sixth embodiment, is directed to an insulating cap 4F that does not have a holding structure.

[0071] An installation jig GG suitable for forming a connection structure by the insulating cap 4F, the electric wire / cable 2, and the connection terminal 3 will be described. The mounting jig GG has an annular support portion GG1 that is partially discontinuous in the circumferential direction, and a plurality of wedge-shaped portions GG2 extending from the annular support portion GG1 along one side of the center line direction of the support portion GG1. The mounting jig GG is made of a flexible material, for example, resin.

[0072] The annular support portion GG1 has a divided portion GG3 that is discontinuous in the circumferential direction, and has a substantially C-shaped shape when viewed from the axial direction. The inner diameter of the support portion GG1 may be equal to or slightly larger than the outer diameter of the coating layer 22. Each wedge-shaped portion GG2 is formed so as to become thinner in the radial direction from its base end on the support portion GG1 side toward its extended end extending in one axial direction. In addition, the radially inner surface of each wedge-shaped portion GG2 is flush with the radially inner surface of the support portion GG1.

[0073] The connection structure consisting of the electric wire / cable 2, the connection terminal 3, and the insulating cap 4F is connected in the same procedure as the connection structure consisting of the electric wire / cable 2, the connection terminal 3, and the insulating cap 4 described above. In this case, the electric wire / cable 2 may be inserted through the support portion GG1 of the mounting jig GG before inserting the electric wire / cable 2 from the holding side end 402 of the insulating cap 4F. Also, after inserting the electric wire / cable 2 from the holding side end 402 of the insulating cap 4F, the dividing portion GG3 may be pushed open so as to face the holding side end 402 of the insulating cap 4F, and the mounting jig GG may be attached to the electric wire / cable 2. In either case, the tip of each wedge-shaped portion GG2 is attached in a direction facing the holding side end 402 of the insulating cap 4F. Then, when the insulating cap 4F is placed in the retracted position, the tips of each of the sharpened wedge-shaped portions GG2 of the mounting jig GG are inserted between the coating layer 22 and the holding side end portion 402 of the second tubular portion 42 of the insulating cap 4F. As a result, the inner circumferential surface of the mounting jig GG is pressed against the covering layer 22, and the insulating cap 4F can be held in the retracted position even when the connection end of the electric wire / cable 2 is facing downward. In addition, after the connection terminal 3 is attached to the conductor 21 of the electric wire / cable 2, the mounting jig GG is pulled out and the divided portion GG3 is pushed apart and removed from the electric wire / cable 2, whereby the insulating cap 4F can be easily moved to cover the connection tube portion 32 of the connection terminal 3.

[0074] As described above, the mounting jig GG effectively prevents the insulating cap 4F from sliding downward from the standby position or from falling off the connection end of the electric wire / cable 2. Therefore, the insulating cap 4F can be prevented from interfering with the connection work of the electric wire / cable 2 and the connection terminal 3. Furthermore, the mounting jig GG can be inserted and removed simply by inserting it into and removing it from the gap between the coating layer 22 and the second tubular portion 42 of the insulating cap 4, making the connection work easier without the need for adhesive tape, and improving work efficiency. Furthermore, the mounting jig GG can be reused any number of times, making it more economical than adhesive tape.

[0075] [Eighth embodiment] FIG. 34 is a perspective view of an installation jig GH for an insulating cap 4F according to the eighth embodiment, the insulating cap 4F, and an electric wire / cable 2, and FIG. 35 is a perspective view of the installation jig GH. Similar to the sixth embodiment, the eighth embodiment is directed to an insulating cap 4F that does not have a holding structure.

[0076] An attachment jig GH suitable for forming a connection structure by the insulating cap 4F, the electric wire / cable 2, and the connection terminal 3 will be described. The mounting jig GH has an annular main body GH1 that is discontinuous in the circumferential direction. The mounting jig GH is made of a flexible material, such as resin. The annular main body GH1 has a dividing portion GH3 that is discontinuous in the circumferential direction, and has a generally C-shaped shape when viewed from the axial direction. The inner diameter of the main body GH1 is slightly smaller than the outer diameter of the second cylindrical portion 42 of the insulating cap 4.

[0077] The connection structure consisting of the electric wire / cable 2, the connection terminal 3, and the insulating cap 4F is connected in the same procedure as the connection structure consisting of the electric wire / cable 2, the connection terminal 3, and the insulating cap 4 described above. In this case, the electric wire / cable 2 may be inserted into the main body GH1 of the mounting jig GH before inserting the electric wire / cable 2 from the holding side end 402 of the insulating cap 4F. In addition, after inserting the electric wire / cable 2 from the holding side end 402 of the insulating cap 4F, the dividing portion GH3 may be pushed open so as to face the holding side end 402 of the insulating cap 4F, and the mounting jig GH may be attached to the electric wire / cable 2. Then, the insulating cap 4F is placed in the retreated position, and the divided portion GH3 of the mounting jig GH is pushed open to place the mounting jig GH on the outer circumferential surface of the second cylindrical portion 42 of the insulating cap 4. As a result, the second tubular portion 42 of the insulating cap 4F is tightened radially inward by the mounting jig GH, and the inner surface of the second tubular portion 42 is pressed against the coating layer 22, so that the insulating cap 4F can be held in the retracted position even when the connection end of the electric wire / cable 2 is facing downward. In addition, after the connection terminal 3 is attached to the conductor 21 of the electric wire / cable 2, the insulating cap 4F can be easily moved by pushing apart the divided portion GH3 of the mounting jig GH and removing it from the electric wire / cable 2, thereby covering the connection tube portion 32 of the connection terminal 3.

[0078] As described above, the mounting jig GH effectively prevents the insulating cap 4F from sliding downward from the standby position or from falling off the connection end of the electric wire / cable 2. Therefore, it is possible to prevent the insulating cap 4F from interfering with the connection work of the electric wire / cable 2 and the connection terminal 3. Furthermore, the mounting jig GH can hold and release the insulating cap 4F simply by attaching or removing it from the outer peripheral surface of the second tubular portion 42, eliminating the need for adhesive tape, making the connection work easier and improving work efficiency. Furthermore, the mounting jig GH can be reused any number of times, making it more economical than adhesive tape.

[0079] [others] Each embodiment of the present invention has been described above. However, the present invention is not limited to the above-mentioned embodiments. For example, in the embodiments, a component integrally formed from a single member may be replaced with a component divided into a plurality of members and connected or fixed to each other. Also, a component formed by connecting a plurality of members may be replaced with a component integrally formed from a single member. In addition, the details shown in the embodiments can be appropriately changed without departing from the spirit of the invention. [Explanation of symbols]

[0080] 2. Wires and cables 21 Conductor 22 Covering layer 3 Connection terminal 4,4A~4F Insulation cap 41 First cylinder part 42 Second cylinder part 43 Transition 44, 44A~44E Convex part 45A, 45C cutout 46E Support part 401 Covered end 402 Holding side end 441C, 441D Tapered surface 10 Connection structure 31 Connected part 32 Connection tube G Jig G1 recess GE fixture GE2 Cone Shaped Section GF mounting jig GF1 Tapered surface GG mounting jig GG1 support part GG2 cuneiform GG3 Divided part GH Mounting Jig GH1 main body GH3 Divided part ME Mold ME1,ME2 recess

Claims

1. A cylindrical insulating cap having insulating properties that covers a connection end of an electric wire / cable having a conductor covered with a covering layer from a connection tube portion of a connection terminal attached to the connection end of the electric wire / cable to the covering layer of the electric wire / cable, An insulating cap comprising an insulating layer having a protrusion on an inside of an end portion on the coating layer side, the protrusion being pressed against the coating layer.

2. 2. The insulating cap according to claim 1, wherein an end of the insulating cap on the side of the coating layer has an inner diameter smaller than an inner diameter of the end on the side of the connecting tube portion.

3. 2. The insulating cap according to claim 1, wherein the protrusion is a protrusion that makes point contact with the coating layer.

4. 2. The insulating cap according to claim 1, wherein the protrusion is a ridge extending in a circumferential direction on an inner peripheral surface of the insulating cap.

5. 2. The insulating cap according to claim 1, wherein the convex portion is a convex stripe along the circumferential direction of the inner peripheral surface of the insulating cap, and has a tapered surface that widens in the axial direction toward the coating layer.

6. 5. The insulating cap according to claim 4, wherein the protrusions, which are protruding stripes along the inner peripheral surface of the insulating cap, are discontinuous in the circumferential direction.

7. 2. The insulating cap according to claim 1, wherein the protrusion is a ridge extending along a central axis of the insulating cap.

8. 2 . The insulating cap according to claim 1 , wherein the protrusion is located at a tip of an inner circumferential surface of the insulating cap on a side facing the coating layer.

9. The insulating cap according to claim 1, characterized in that the convex portion is supported by a support portion extending radially inward from a tip of the insulating cap on the coating layer side, and the insulating cap is pressed against the coating layer by being attached to the outer periphery of the electric wire / cable.

10. A mounting jig for a cylindrical insulating cap that covers a connection end of an electric wire / cable having a conductor covered with a coating layer from a connection tube portion of a connection terminal attached to the connection end of the electric wire / cable to the coating layer of the electric wire / cable, An insulating cap installation jig, characterized in that it is wedge-shaped and is inserted between the insulating cap and the coating layer.

11. A mounting jig for a cylindrical insulating cap that covers a connection end of an electric wire / cable having a conductor covered with a coating layer from a connection tube portion of a connection terminal attached to the connection end of the electric wire / cable to the coating layer of the electric wire / cable, a plurality of wedges interposed between the insulating cap and the coating layer; a support portion that supports the plurality of wedge-shaped portions and is annular and has divided portions that are discontinuous in the circumferential direction.

12. A mounting jig for a cylindrical insulating cap that covers a connection end of an electric wire / cable having a conductor covered with a coating layer from a connection tube portion of a connection terminal attached to the connection end of the electric wire / cable to the coating layer of the electric wire / cable, An insulating cap installation jig having an annular shape having a discontinuous divided portion in the circumferential direction, characterized in that the insulating cap is fastened to the center side of the electric wire / cable on the outer peripheral surface thereof.

13. A connection structure including a connection end of an electric wire / cable having a conductor covered with a covering layer, a connection terminal attached to the connection end, and a cylindrical insulating cap having insulating properties that covers the connection end from a connection tube portion of the connection terminal to the covering layer of the electric wire / cable, The insulating cap has a protrusion on an inner side of an end portion on the coating layer side, A connection structure, characterized in that a diameter of an inscribed circle of the protrusion inside the insulating cap is smaller than an outer diameter of the coating layer.

Images