JP2016177869A - Heat-shrinkable tube fixing jig and heat-shrinkable tube fixing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique of suppressing a heat-shrinkable tube from being fixed to an electrical wire with a terminal while the heat-shrinkable tube is obliquely tilted.SOLUTION: A heat-shrinkable tube fixing jig 100 is used when a heat-shrinkable tube 30 is fixed to a terminal-affixed electrical wire 10 which is configured by crimping a core wire crimping portion 24 of a terminal 20 to a core wire 14 of an electrical wire 12. The heat-shrinkable tube fixing jig 100 is provided with a front end side plate-like member 40, and the front end side plate-like member 40 includes a columnar body 60 for positioning the terminal 20 of the terminal-affixed electrical wire 10, and a tube positioning portion 50 for positioning the heat-shrinkable tube 30 while partially supporting a front end portion 32 at the terminal 20 side out of the heat-shrinkable tube 30. The tube positioning portion 50 has a first contact face 51 which is in contact with the lower surface of the front end portion 32 to support the front end portion 32, a second contact face 52 that is in contact with a front end face 321 of the front end portion 32, and a pair of third contact faces 53, 53 which are in contact with both sides of the front end portion 32.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a technique for attaching a heat-shrinkable tube to a terminal-attached electric wire configured by crimping a core wire crimping portion of a terminal to a core wire of an electric wire.

  In a terminal-attached electric wire, a heat-shrinkable tube may be attached to the crimping part for the purpose of preventing water from entering the electric wire with the terminal crimped. Patent Documents 1 to 3 disclose a heat-shrinkable tube attachment jig for attaching a heat-shrinkable tube to a terminal-attached electric wire.

  The heat-shrinkable tube mounting jigs described in Patent Documents 1 to 3 fix the heat-shrinkable tube at a portion pressing the lower surface of the front end portion on the terminal side of the heat-shrinkable tube and abut against the terminal-side end surface of the heat-shrinkable tube. The heat-shrinkable tube is positioned by the contact portion.

JP 2005-135858 A JP 2006-261655 A JP 2013-114936 A

  However, in the case of the conventional heat-shrinkable tube mounting jig, since both sides of the heat-shrinkable tube are open, the heat-shrinkable tube tends to be inclined obliquely. For this reason, the heat-shrinkable tube is obliquely attached to the terminal-attached electric wire, which may cause an attachment failure.

  Then, an object of this invention is to provide the technique which suppresses that a heat contraction tube inclines inclining with respect to the electric wire with a terminal.

  In order to solve the above-mentioned problem, the first aspect is that a heat-shrinkable tube used when a heat-shrinkable tube is attached to a terminal-attached electric wire configured by crimping a terminal core wire crimping portion to a core wire of a wire. A mounting jig that is a terminal-attached electric wire inserted into the heat-shrinkable tube, a terminal-positioned portion that positions a terminal exposed from the heat-shrinkable tube, and a front end portion on the terminal side of the heat-shrinkable tube. A tube positioning portion for positioning the heat-shrinkable tube, and the tube positioning portion is in contact with the lower surface of the front end portion and supports the front end portion. And a second contact portion that contacts the end surface of the front end portion, and a pair of third contact portions that contact both side surfaces of the front end portion.

  Moreover, a 2nd aspect is a heat contraction tube attachment jig which concerns on a 1st aspect, Comprising: The said positioning part contains the columnar body penetrated by the hole formed in the terminal.

  Moreover, a 3rd aspect is a heat contraction tube attachment jig which concerns on the 1st or 2nd aspect, Comprising: The rear-end surface contact part which contact | abuts the rear-end surface on the electric wire side of the said heat-shrink tube is further provided.

  The fourth aspect is a heat-shrinkable tube mounting jig according to any one of the first to third aspects, wherein the terminal-positioned portion and the tube-positioned portion have one plate-like body. The surface of the tube positioning portion is treated with polytetrafluoroethylene.

  The fifth aspect is a heat-shrinkable tube mounting jig according to any one of the first to fourth aspects, wherein the terminal-positioned portion and the tube-positioned portion are a single plate shape. The tube-positioned portion is a concave portion provided at an edge portion of the plate-like body.

  A sixth aspect is a heat shrinkable tube mounting method for attaching a heat shrinkable tube to a terminal-attached electric wire configured by crimping a core wire crimping portion of a terminal to a core wire of an electric wire, and (a) heat shrinkage A step of preparing a terminal-attached electric wire passed through the tube, (b) a terminal-positioned portion for positioning the terminal of the terminal-attached electric wire, and a heat-shrinkable tube while partially supporting the terminal-side front end portion, A step of assembling the electric wire with terminal to a heat-shrinkable tube mounting jig including a tube positioning portion for positioning the shrinkable tube, and (c) a step of heating the heat-shrinkable tube, and the step (b) (B-1) a step of positioning the terminal at the terminal positioning portion; and (b-2) the first abutting portion of the tube positioning portion is brought into contact with the lower surface of the front end portion, and the front end portion And the second tube positioning portion The contact portion, the abutted against the end face of the front end portion and the third contact portions of the pair of the tube the locate section, and a step to abut on both sides of the front end.

  According to the first to sixth aspects, since both side surfaces of the front end portion of the heat shrinkable tube are pressed by the pair of third contact portions, the heat shrinkable tube is attached obliquely with respect to the electric wire with terminal. Can be suppressed.

  Moreover, according to the 2nd aspect, since a terminal can be positioned by letting a columnar body pass through the hole of a terminal, positioning of an electric wire with a terminal can be performed easily.

  Moreover, according to the 3rd aspect, the rear-end surface of a heat contraction tube can be positioned by the rear-end surface contact part. Thereby, a heat contraction tube can be easily attached to an exact position with respect to an electric wire with a terminal.

  Moreover, according to the 4th aspect, it can suppress that the adhesive agent in a heat contraction tube adheres to a tube position attaching part. Moreover, since the surface of the 2nd contact part contact | abutted to the front-end surface of a heat contraction tube is processed with the polytetrafluoroethylene, it can reduce that the adhesive agent melt | dissolved from the heat contraction tube protrudes.

  Moreover, according to the 5th aspect, a heat-shrinkable tube can be positioned by a simple structure by making a tube position part into the recessed part formed in the edge part of a plate-shaped object. Moreover, the tube position attaching part can be easily provided with a plurality of tube position attaching parts in a single plate-like body by making the tube attaching part a concave part.

It is a schematic top view which shows the electric wire with a terminal which concerns on embodiment. It is a schematic side view which shows the electric wire with a terminal which concerns on embodiment. It is a schematic perspective view which shows the heat shrinkable tube attachment jig which concerns on embodiment. It is a schematic top view of the heat-shrinkable tube mounting jig according to the embodiment. It is a figure which shows the schematic cross section of the heat shrinkable tube attachment jig in the VV position shown in FIG. It is a figure which shows the schematic cross section of the heat contraction tube attachment jig in the VI-VI position shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the component described in this embodiment is an illustration to the last, and is not a thing of the meaning which limits the scope of the present invention only to them. In the drawings, the size and number of each part may be exaggerated or simplified as necessary for easy understanding.

  Drawing 1 is an outline top view showing electric wire 10 with a terminal concerning an embodiment. FIG. 2 is a schematic side view showing the terminal-attached electric wire 10 according to the embodiment. As shown in FIGS. 1 and 2, the terminal-attached electric wire 10 includes an electric wire 12 and a terminal 20.

  The electric wire 12 includes a core wire 14 and a covering portion 18 that covers the core wire 14. The core wire 14 is a linear conductor, and is formed, for example, by twisting a plurality of strands. The covering portion 18 is formed of an insulating material such as resin. The covering portion 18 is formed by, for example, extrusion-coating a softened resin around the core wire 14.

  In addition, a covering portion 18 having a predetermined length is peeled from the core wire 14 at the end of the electric wire 12. Thus, an exposed core wire portion 14a is provided at the end of the electric wire 12 so that the core wire 14 is exposed over a predetermined length.

  The terminal 20 is a member formed by pressing a metal plate material that is a conductive plate material. The terminal 20 is configured as a ground terminal, and includes a ground portion 21 in which a through hole 21 </ b> H through which a bolt is inserted is formed, and a wire holding portion 22 that is continuous with the ground portion 21.

  The electric wire holding part 22 includes a core wire crimping part 24 and a covering crimping part 26. Each of these portions is formed in a line along a straight line. In the terminal 20, the ground portion 21 side is the distal end side of the terminal 20, and the wire holding portion 22 side is the proximal end side of the terminal 20.

  The core wire crimping portion 24 is a portion that is crimped to the exposed core wire portion 14a by being caulked. The covering crimping portion 26 is a portion that is crimped to the end portion of the covering portion 18 of the electric wire 12 by being caulked.

  The heat-shrinkable tube 30 is attached using a heat-shrinkable tube mounting jig 100 described later when the water stop treatment is performed on the electric wire with terminal 10 having such a configuration. Inside the heat shrinkable tube 30, a hot melt 31 as an adhesive is attached. As shown in FIGS. 1 and 2, the heat-shrinkable tube 30 is attached so as to cover the exposed core portion 14 a of the electric wire 12 in the water stop treatment. Then, the heat shrinkable tube 30 is contracted by heating with a heating device, and the internal hot melt 31 penetrates into the core wire crimping portion 24 and the like. Thereby, the heat-shrinkable tube 30 is attached to the electric wire 10 with a terminal, and water is stopped.

<Heat Shrink Tube Mounting Jig 100>
Next, the configuration of the heat shrinkable tube mounting jig 100 will be described in detail. In the following description, when viewed from the heat-shrinkable tube 30, the terminal 20 side is the front side, and the wire 12 side is the rear side.

  FIG. 3 is a schematic perspective view showing the heat shrinkable tube mounting jig 100 according to the embodiment. FIG. 4 is a schematic top view of the heat-shrinkable tube mounting jig 100 according to the embodiment. FIG. 5 is a schematic cross-sectional view of the heat-shrinkable tube mounting jig 100 at the VV position shown in FIG. 6 is a schematic cross-sectional view of the heat shrinkable tube mounting jig 100 at the VI-VI position shown in FIG.

  The heat-shrinkable tube mounting jig 100 includes a front end side plate-like body 40 and a rear end side plate-like body 45.

<Front end side plate-like body 40>
The front end side plate-like body 40 is a long rectangular parallelepiped member. Although the material of the front end side plate-like body 40 is not particularly limited, for example, it is made of resin or metal. The surface of the front end side plate-like body 40 is preferably coated with polytetrafluoroethylene (Teflon (registered trademark)). By treating with polytetrafluoroethylene, when the hot melt 31 in the heat-shrinkable tube 30 leaks to the outside during the heat treatment, it can be prevented from adhering to the surface of the front end side plate-like body 40. As will be described later, in the present embodiment, the tube positioning portion 50 of the front end side plate-like body 40 contacts the distal end portion (front end portion 32) of the heat shrinkable tube 30. For this reason, only the surface of the tube positioning portion 50 may be treated with polytetrafluoroethylene.

  A plurality of tube positioning portions 50 for positioning the heat-shrinkable tube 30 are provided at corners (edge portions 41) along the longitudinal direction on the upper surface of the front end side plate-like body 40. In the illustrated example, five tube positioning portions 50 are provided, but the quantity is not limited to this. For example, only one tube position attaching part 50 may be sufficient. In the present embodiment, each tube positioning portion 50 is a concave portion obtained by cutting out the edge portion 41 of the front end side plate-like body 40 into a substantially rectangular parallelepiped shape.

  Columnar bodies 60 are erected on the upper surface of the front end side plate-like body 40. In the present embodiment, five columnar bodies 60 are erected. Each columnar body 60 is formed in a columnar shape. The outer diameter of each columnar body 60 is formed slightly smaller than the opening diameter of the through hole 21H formed in the ground portion 21 of the terminal 20. As shown in FIG. 4 or FIG. 6, each columnar body 60 is passed through a through hole 21 </ b> H formed in the ground portion 21 of the terminal 20. Thereby, the terminal 20 exposed from the heat shrinkable tube 30 in the electric wire with terminal 10 inserted through the heat shrinkable tube 30 is positioned by the columnar body 60. That is, the columnar body 60 is an example of a terminal positioning portion that positions the terminal 20 of the terminal-attached electric wire 10.

  Note that the shape of the columnar body 60 is not limited to a cylindrical shape. For example, in addition to an elliptical shape and a polygonal column shape, a conical shape, a polygonal pyramid shape, and the like may be used. Further, the terminal-positioned portion is not limited to one that is inserted into the through hole 21H of the ground portion 21. For example, a contact member having a shape that matches the outer shape of the ground portion 21 may be provided, and the terminal 20 may be positioned by the contact member.

  The tube positioning portion 50 partially supports the heat shrinkable tube 30 attached to the terminal-attached electric wire 10 positioned by the columnar body 60. That is, as shown in FIGS. 4 to 6, the end portion (front end portion 32) on the terminal side of the heat shrinkable tube 30 is partially supported.

  More specifically, the tube positioning portion 50 includes a first contact surface 51 (first contact portion) that contacts the front end portion 32 of the heat shrinkable tube 30 assembled to the heat shrinkable tube mounting jig 100, and a second portion. A contact surface 52 (second contact portion) and a pair of third contact surfaces 53 (third contact portion) are provided.

  As shown in FIGS. 5 and 6, the first contact surface 51 contacts the lower surface of the front end portion 32 of the heat shrinkable tube 30 to support the front end portion 32. As shown in FIGS. 4 and 6, the second contact surface 52 is a flat surface that contacts the front end surface 321 (the end surface facing the terminal 20) of the front end portion 32 of the heat shrinkable tube 30. The second contact surface 52 is a surface that stands upright from the first contact surface 51. The second contact surface 52 is in contact with a portion of the front end surface 321 of the front end portion 32 on the lower side of the terminal 20 (that is, the side opposite to the side on which the core wire 12 is placed in the terminal 20). Touch. Further, the pair of third contact surfaces 53 and 53 are flat surfaces that contact both side surfaces of the front end portion 32 of the heat shrinkable tube 30 as shown in FIGS. 4 and 5. The pair of third contact surfaces 53, 53 form surfaces that face each other and intersect with both the first contact surface 51 and the second contact surface 52. Here, the pair of third contact surfaces 53, 53 form a surface orthogonal to the first contact surface 51 and the second contact surface 52.

  According to the tube position attaching part 50, since the movement to the front of the heat shrinkable tube 30 is regulated by the second contact surface 52, the heat shrinkable tube 30 can be prevented from moving to the grounding part 21 side of the terminal 20. . In addition, a portion of the front end surface 321 of the front end portion 32 of the heat shrinkable tube 30 that is below the terminal 20 contacts the second contact surface 52. For this reason, when the heat-shrinkable tube 30 is contracted by heat treatment, it is possible to prevent the melted hot melt 31 from leaking from the lower side of the terminal 20. In particular, when the second contact surface 52 is treated with polytetrafluoroethylene, the hot melt 31 can be further prevented from protruding.

  Further, the movement of the front end portion 32 of the heat-shrinkable tube 30 in the width direction can be restricted by the pair of third contact surfaces 53 and 53 of the tube positioning portion 50. For this reason, it can suppress that the heat-shrinkable tube 30 inclines diagonally with respect to the electric wire 10 with a terminal in the case of heat processing. Therefore, it can suppress that the heat contraction tube 30 is attached in the state inclined with respect to the electric wire 10 with a terminal.

  In the present embodiment, the first contact surface 51 is not necessarily formed flat. For example, a convex surface extending in the width direction of the heat shrinkable tube 30 may be formed. In this case, the contact surface between the front end portion 32 and the first contact surface is linear.

  Further, the second contact surface 52 and the pair of third contact surfaces 53, 53 are not necessarily formed flat. The terminal-attached electric wire 10 inserted through the heat-shrinkable tube 30 is in contact with the front end surface 321 of the front end portion 32 of the heat-shrinkable tube 30 and both side surfaces of the front end portion 32 in a state where it is set in the heat-shrinkable tube mounting jig 100. Thus, the 2nd contact surface 52 and the 3rd contact surfaces 53 and 53 should just be comprised.

  In the present embodiment, the tube positioning portion 50 is formed as a concave portion, and the first abutting portion and the second abutting portion that abut each of the inner surfaces thereof against the front end portion 32 of the heat shrinkable tube 30. And it is set as the 3rd contact part. However, the first contact portion, the second contact portion, and the third contact portion are not limited to the concave portions. For example, each contact portion may be provided in an individual member by configuring the tube-positioned portion with a plurality of members.

<Rear end side plate 45>
As shown in FIG. 3, the rear end side plate-like body 45 is a member formed in a substantially rectangular parallelepiped shape. The rear end side plate-like body 45 is arranged in parallel with the front end side plate-like body 40 at a predetermined distance from the tube positioning portion 50 of the front end side plate-like body 40. The front end side plate-like body 40 and the rear end side plate-like body 45 are connected by a pair of connecting members 70, 70.

  As shown in FIG. 6, in the rear end side plate-like body 45, the surface facing the tube positioning portion 50 of the front end side plate-like body 40 (more specifically, the surface facing the second contact surface 52) is It has the 4th contact surface 451 (rear end surface contact part) contact | abutted to the rear end surface 33 (end surface which faces the electric wire 12 side) of the heat contraction tube 30. FIG. Of the rear end side plate-like body 45, the surface of the fourth contact surface 451 and its peripheral portion is preferably coated with polytetrafluoroethylene.

  As shown in FIG. 6, the upper surface of the rear end side plate-like body 45 supports the electric wire 12 exposed from the heat-shrinkable tube 30 in the terminal-attached electric wire 10.

  Such a rear end side plate-like body 45 is not an essential configuration and may be omitted. However, as shown in FIG. 6, the rearward movement of the heat-shrinkable tube 30 can be restricted by pressing the rear-end surface 33 of the heat-shrinkable tube 30 with the fourth contact surface 451 of the rear end side plate-like body 45. it can. Therefore, the heat-shrinkable tube 30 can be positioned more accurately by combining the rear end side plate-like body 45 with the front end side plate-like body 40 provided with the tube positioning portion 50.

  Next, the flow of applying a water stop treatment to the terminal-attached electric wire 10 using the heat-shrinkable tube mounting jig 100 will be described.

  First, as shown in FIG. 1 or FIG. 2, a terminal-attached electric wire 10 inserted through a heat-shrinkable tube 30 is prepared. The heat-shrinkable tube 30 is arranged at a position that covers a water-stop target portion of the terminal-attached electric wire 10 (for example, the vicinity of the core wire crimping portion 24 of the terminal 20).

  Subsequently, as illustrated in FIG. 4 and the like, the columnar body 60 that is a terminal-positioned portion is inserted into the through hole 21H of the terminal 20 in the terminal-attached electric wire 10 inserted through the heat-shrinkable tube 30. Thereby, positioning of the terminal 20 is performed.

  Subsequently, the front end portion 32 of the heat shrinkable tube 30 is brought into contact with each contact surface of the tube positioning portion 50. Specifically, the lower surface of the front end portion 32 is in contact with the first contact surface 51 (see FIGS. 4 and 6), and the front end surface 321 of the front end portion 32 is in contact with the second contact surface 52 (see FIG. 4 and FIG. 6), both side surfaces of the front end portion 32 are brought into contact with the pair of third contact surfaces 53, 53 (see FIGS. 4 and 5). As a result, the front end portion 32 is positioned by the tube positioning portion 50.

  Further, the rear end surface 33 of the heat shrinkable tube 30 is brought into contact with the fourth contact surface 451 of the rear end side plate-like body 45 (see FIG. 6).

  In this manner, the heat treatment tube 30 in a state assembled to the heat shrinkable tube mounting jig 100 is subjected to heat treatment by the heating device 80. In addition, when the fixed heating device 80 is used, by transporting the heat-shrinkable tube mounting jig 100 and the electric wires with terminals 10 assembled to the heat-shrinkable tube mounting jig 100 to the heating device 80, The heat shrinkable tube 30 is heated. When the movable heating device 80 is used, the heat shrinkable tube 30 is heated by moving the heating device 80 to the position of the heat shrinkable tube mounting jig 100.

  By using the heat-shrinkable tube mounting jig 100, the pair of third contact surfaces 53 in the tube-positioned portion 50 prevents the heat-shrinkable tube 30 from being inclined and attached to the terminal-attached electric wire 10. it can. In addition, since the first abutment surface 51 of the tube positioning portion 50 is in contact with only the front end portion 32 of the heat shrinkable tube 30 and partially supports the heat shrinkable tube 30, heating is uniform throughout the heat shrinkable tube 30. Can be done.

  Moreover, the tube position attaching part 50 can be easily provided in the single front end side plate-shaped body 40 by making the tube position attaching part 50 into a concave part. Furthermore, by providing a plurality of sets of the plurality of tube positioning portions 50 and the columnar bodies 60, the heat-shrinkable tubes 30 can be attached to a large number of the terminal-attached electric wires 10 at the same time.

  Although the present invention has been described in detail, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention. In addition, the configurations described in the above embodiments and modifications can be appropriately combined or omitted as long as they do not contradict each other.

DESCRIPTION OF SYMBOLS 100 Heat-shrinkable tube attachment jig 10 Electric wire with a terminal 12 Electric wire 14 Core wire 14a Exposed core wire part 18 Covering part 20 Terminal 21 Ground part 21H Through hole 22 Electric wire holding part 24 Core wire crimping part 26 Covering crimping part 30 Heat-shrinkable tube 31 Hot melt 32 Front end 321 Front end face (end face)
33 Rear end face 40 Front end side plate-like body (plate-like body)
41 Edge part 45 Rear end side plate-like body 451 4th contact surface (rear end surface contact part)
50 Tube positioning portion 51 First contact surface (first contact portion)
52 2nd contact surface (2nd contact part)
53 3rd contact surface (3rd contact part)
60 Columnar (terminal positioning part)
80 Heating device

Claims (6)

A heat-shrinkable tube mounting jig used for attaching a heat-shrinkable tube to a terminal-attached electric wire configured by crimping a terminal core-wire crimping portion on a wire core,
In the terminal-attached electric wire inserted through the heat-shrinkable tube, a terminal-positioned portion for positioning the terminal exposed from the heat-shrinkable tube,
Among the heat-shrinkable tubes, including a tube positioning portion for positioning the heat-shrinkable tube while partially supporting the front end portion on the terminal side,
The tube positioning part is
A first contact portion that contacts the lower surface of the front end portion and supports the front end portion;
A second contact portion that contacts the end surface of the front end portion;
A pair of third abutting portions that abut against both side surfaces of the front end portion;
A heat shrink tube mounting jig. The heat shrinkable tube mounting jig according to claim 1,
The heat-shrinkable tube mounting jig, wherein the positioning portion includes a columnar body that is inserted into a hole formed in the terminal. The heat-shrinkable tube mounting jig according to claim 1 or 2,
A rear end surface abutting portion that abuts on the rear end surface of the heat shrinkable tube on the electric wire side,
A heat shrinkable tube mounting jig. The heat-shrinkable tube mounting jig according to any one of claims 1 to 3,
A heat shrinkable tube mounting jig in which the surface of the tube positioning portion is treated with polytetrafluoroethylene. The heat-shrinkable tube mounting jig according to any one of claims 1 to 4,
The terminal-positioned portion and the tube-positioned portion are provided on a single plate-like body,
The heat shrinkable tube mounting jig, wherein the tube positioning portion is a concave portion provided at an edge portion of the plate-like body. A heat-shrinkable tube mounting method for attaching a heat-shrinkable tube to a terminal-attached electric wire configured by crimping a terminal core crimping portion to a core wire of an electric wire,
(A) preparing a terminal-attached electric wire passed through a heat-shrinkable tube;
(B) A heat-shrinkable tube provided with a terminal-positioned portion for positioning the terminal of the terminal-attached electric wire and a tube-positioned portion for positioning the heat-shrinkable tube while partially supporting the front end portion on the terminal side of the heat-shrinkable tube. Assembling the electric wire with terminal to a mounting jig;
(C) heating the heat shrinkable tube;
Including
The step (b)
(B-1) positioning the terminal at the terminal positioning portion;
(B-2) The first contact portion of the tube-positioned portion is brought into contact with the lower surface of the front end portion to support the front end portion, and the second contact portion of the tube position-attached portion is Contacting the end surface of the front end portion, and contacting the pair of third contact portions of the tube positioning portion with both side surfaces of the front end portion;
Including a heat shrinkable tube mounting method.

Images