JP2012038421A - Terminal structure of electric wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal structure of an electric wire, which is excellent in handleability even if a mold structure is eliminated.SOLUTION: A terminal structure of an electric wire 10 includes: a bracket 30 comprising a cylindrical portion 31 through which the electric wire 10 is inserted, and an attachment part 32 which is integrally connected to the cylindrical portion 31 and is to be attached to a device 100; a chuck member 60 which comes into closer contact with an inner surface of the cylindrical portion 31 and an outer surface of the electric wire 10 to restrict a relative displacement of the bracket 30 to the electric wire 10 as the chuck member is inserted into the cylindrical portion 31 more deeply.

Description

  The present invention relates to a terminal structure of an electric wire.

  Patent Document 1 discloses a conventional wire terminal structure. This is provided with a bracket that is attached to the device while the electric wire is inserted therethrough. A resin is filled between the electric wire and the bracket, and the resin is filled and solidified to form a mold housing around the end of the electric wire. For this reason, an electric wire and a bracket are integrally hold | maintained via a mold housing.

JP 2006-134898 A

  By the way, in the thing which takes the above mold structure, since the exclusive machine for mold shaping | molding is required, there exists a situation that an assembly line becomes large while the capital investment amount becomes high. On the other hand, depending on the installation conditions and the like, strict waterproofing may not be required. In that case, it is possible to use a simpler method without taking a mold structure. However, for example, simply inserting the bracket through the electric wire causes a problem that the bracket is displaced in the axial direction with respect to the electric wire before being attached to the case, which makes it difficult to handle.

  This invention is completed based on the above situations, Comprising: Even if a mold structure is abolished, it aims at providing the terminal structure of an electric wire with favorable handleability.

  As means for achieving the above object, the invention of claim 1 includes a bracket portion having a cylindrical portion through which an electric wire is inserted, and an attachment portion that is integrally connected to the cylindrical portion and attached to an attachment target, A chuck member that is inserted into the cylindrical portion and increases in insertion depth so as to tightly contact the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the electric wire to restrict the displacement of the bracket relative to the electric wire; However, it has characteristics.

  According to a second aspect of the present invention, in the first aspect of the present invention, the apparatus includes a rubber plug that is fitted to the outer periphery of the electric wire and inserted into the cylindrical portion, and the chuck member is inserted deeply into the cylindrical portion. Thus, the rubber plug is characterized in that it is compressed between the chuck member and the inner wall of the cylindrical portion.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a pressing member capable of pressing the chuck member is provided, and an engagement groove is formed in one of the pressing member and the cylindrical portion. On the other hand, an engaging protrusion that enters the engaging groove is formed, and the pressing member is rotated in the extending direction of the engaging groove so that the engaging protrusion is moved into the engaging groove. And the chuck member is pushed into the cylindrical portion.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, a guide protrusion is formed on one of the outer peripheral surface of the chuck member and the inner peripheral surface of the cylindrical portion, and a guide groove is formed on the other. Is formed, and the chuck member is moved and guided in the axial direction when the guide protrusion slides on the groove surface of the guide groove in accordance with the rotation operation of the pressing member.

  According to a fifth aspect of the present invention, the guide groove according to the fourth aspect is configured such that the depth of the guide groove gradually increases in the push-in direction of the chuck member, and the guide protrusion protrudes in the push-in direction of the chuck member. It is characterized in that it is configured to gradually increase the allowance with the guide groove.

<Invention of Claim 1>
By increasing the insertion depth of the chuck member into the cylindrical portion, the chuck member comes into close contact with the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the electric wire, and the displacement of the bracket relative to the electric wire is restricted. The bracket is integrally held via the chuck member. Therefore, even if the bracket is restricted from being displaced in the axial direction with respect to the electric wire, and the mold structure is abolished, a terminal structure of the electric wire with good handleability is provided.

<Invention of Claim 2>
Since the rubber plug is compressed between the chuck member and the inner wall of the cylindrical portion when the chuck member is inserted deeply into the cylindrical portion, the rubber plug is strongly attached to the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the electric wire. Adhering to each other improves sealing performance.

<Invention of Claim 3>
By rotating the pressing member in the extending direction of the engaging groove, the engaging protrusion is displaced along the engaging groove and the chuck member is pushed into the cylindrical portion. It can be done smoothly.

<Invention of Claim 4>
As the guide protrusion slides on the groove surface of the guide groove, the chuck member is moved and guided in the axial direction. Therefore, the chuck member is prevented from being rotated by the turning operation of the pressing member, and the electric wire is Twisting is avoided.

<Invention of Claim 5>
The guide groove is configured to gradually increase the depth in the pushing direction of the chuck member, and the guide protrusion is configured to gradually increase the allowance with the guide groove in the pushing direction of the chuck member. As this increases, the stability of the moving posture of the chuck member is improved.

It is a perspective view of the terminal structure of the electric wire which concerns on Embodiment 1 of this invention. It is a disassembled perspective view of the terminal structure of an electric wire. It is a side view of the terminal structure of an electric wire. It is sectional drawing from the front of the terminal structure of an electric wire. It is sectional drawing from the side of the terminal structure of an electric wire. It is sectional drawing from the upper direction of the terminal structure of an electric wire. It is an exploded sectional view of the terminal structure of an electric wire. It is sectional drawing which shows the state in which the bracket was attached to the apparatus.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. The terminal structure of the electric wire according to the present embodiment includes the electric wire 10, the terminal fitting 20, the bracket 30, the chuck member 60, the rubber plug 70, the seal ring 80, and the pressing member 90. It is attached to the device 100 (attachment target). In addition, the circumference | surroundings of the electric wire 10 and the terminal metal fitting 20 are not resin-molded.

  The device 100 has a conductive shield case 101 as shown in FIG. A circular attachment hole 102 is formed through the side wall of the shield case 101, and a bottomed female screw hole 103 is formed on the outer surface above the attachment hole 102. A conductive portion 104 that can be connected to the terminal fitting 20 is housed inside the shield case 101.

  The electric wire 10 includes a conductive core wire 11 and an insulating coating 12 that covers the periphery of the core wire 11, and is an unshielded type. The core wire 11 is exposed and disposed at the end of the electric wire 10 by removing the coating 12.

  The terminal fitting 20 is made of a conductive metal, and as shown in FIG. 1, it has a flat plate-like device connection portion 21 that is long in the front-rear direction in its substantially first half portion, and an open barrel-like wire connection portion in its substantially latter half portion. 22. The device connection portion 21 is formed with a circular bolt hole 23 that is long in the front-rear direction. The terminal fitting 20 is connected to the conductive portion 104 in the shield case 101 via a bolt 200 that penetrates the bolt hole 23. A pair of right and left caulking pieces 24 are formed on the electric wire connection portion 22 from both side edges of the bottom plate. The both caulking pieces 24 are caulked to the exposed core wire 11 from the left and right sides. In addition, the electric wire connection part 22 is made one step higher than the apparatus connection part 21 through the step-like connection part 25 between the apparatus connection parts 21.

  As shown in FIG. 2, the bracket 30 is made of a synthetic resin, and includes a cylindrical tube portion 31 and a plate-shaped attachment portion 32 that is integrally raised from a substantially central portion in the front-rear direction of the tube portion 31. An electric wire insertion hole 33 through which the electric wire 10 is inserted is formed through the inside of the cylindrical portion 31.

  A circular insertion hole 34 is formed through the rising end portion of the mounting portion 32, and a collar 35 is mounted along the inner peripheral surface of the insertion hole 34. When the bracket 30 is attached to the device 100, the attachment portion 32 is brought into contact with the outer surface of the side wall of the shield case 101 from the rear side. The screw member 300 is screwed into the hole 103.

  As shown in FIG. 5, a holding groove 36 is formed on the outer peripheral surface of the cylindrical portion 31 in front of the mounting portion 32 over the entire circumference. An annular seal ring 80 is fitted into the holding groove 36. When the bracket 30 is attached to the device 100, the substantially first half portion of the cylindrical portion 31 is inserted into the attachment hole 102, and the seal ring 80 is brought into close contact with the inner peripheral surface of the attachment hole 102 and sealed.

  A back wall 37 is formed in the radial direction at the front end of the cylindrical portion 31. In the center portion of the back wall 37, a wire through hole 38 having a shape in which the wire insertion hole 33 is narrowed is formed. The wire through-hole 38 has an opening diameter that is slightly larger than the outer diameter of the wire 10.

  Inside the cylindrical portion 31, a first accommodation space 39 in which the rubber plug 70 is accommodated and a second accommodation space 40 in which the chuck member 60 is accommodated are separately held in the front-rear direction. The first accommodation space 39 is disposed in front of the attachment portion 32 and at a position facing the holding groove 36. The second accommodation space 40 is longer in the front-rear direction than the first accommodation space 39 and is disposed across the attachment portion 32. And the internal peripheral surface of the 1st accommodation space 39 is made into the substantially same diameter in the front-back direction. On the other hand, the inner peripheral surface of the second accommodation space 40 is gradually reduced in diameter from the rear end of the cylindrical portion 31 toward the front, and is a tapered surface 41 that is continuous with the rear end of the first accommodation space 39 at the front end. ing.

  As shown in FIG. 7, a pair of left and right sides that extend forward from the rear end of the cylindrical portion 31 and are connected to the rear end of the first storage space 39 in a stepped manner at both ends in the width direction of the inner peripheral surface of the second storage space 40. The guide groove 42 is formed. The bottom surface of the guide groove 42 is disposed along the front-rear direction that is in a direction intersecting the tapered surface 41. For this reason, the guide groove 42 is configured to gradually increase the depth from the rear end to the front end of the cylindrical portion 31.

  In addition, a pair of left and right engaging projections 43 are formed on the outer peripheral surface of the cylindrical portion 31 at the rear end portions on both sides in the width direction behind the attachment portion 32. The engaging protrusion 43 has a substantially cylindrical small protrusion shape, and is disposed at a position facing the guide groove 42 across the wall of the cylindrical portion 31.

  The rubber plug 70 is made of rubber such as silicon rubber and has a substantially cylindrical shape as a whole. The outer peripheral surface of the rubber plug 70 can be in close contact with the inner peripheral surface of the cylindrical portion 31, and the inner peripheral surface of the rubber plug 70 can be in close contact with the outer peripheral surface of the electric wire 10.

  The chuck member 60 is made of a synthetic resin and has a truncated cone shape that is reduced in diameter toward the front as a whole. The chuck member 60 is positioned between the bracket 30 and the electric wire 10 and is fastened to both. As shown in FIG. 2, the chuck member 60 includes a pair of left and right halves 61 separated from each other with a facing edge 68 at the center in the width direction as a boundary. Both halves 61 are symmetrical and have the same shape. Specifically, the halved body 61 includes a peripheral wall 62 having a truncated cone surface, a front wall 63 having a front end surface extending in the radial direction connected to the front end of the peripheral wall 62, and a radial direction connecting to the rear end of the peripheral wall 62. And a rear wall 64 having a rear end face. On both inner edges of the front wall 63 and the rear wall 64, a wire contact portion 65 capable of contacting the outer peripheral surface of the wire 10 is formed by cutting out. The electric wire contact portion 65 has a substantially semicircular shape along the outer peripheral surface of the electric wire 10, and the opening diameter between the two halves 61 is reduced along with the combination of the halves 61, so that the electric wire 10 is moved from the circumferential direction. It can be held.

  A guide projection 66 extending in the front-rear direction is formed on the outer peripheral surface (outer truncated cone surface) of the peripheral wall 62. The guide protrusions 66 are arranged in pairs at both ends in the width direction of the chuck member 60, and are allowed to enter the guide groove 42 and slide in the process in which the chuck member 60 is inserted into the second accommodation space 40. (See FIG. 4). The outer end (protruding end) of the guide protrusion 66 is disposed along the front-rear direction that intersects the truncated cone surface. For this reason, the guide protrusion 66 is configured to gradually increase in height from the rear end to the front end of the half body 61, in other words, configured to gradually increase the allowance for the guide groove 42 toward the front. ing.

  The pressing member 90 is made of a synthetic resin, has a cap shape that can be fitted to the cylindrical portion 31 from the rear, and can press the chuck member 60 from the rear. The pressing member 90 includes a substantially circular back plate 91 and a peripheral plate 92 protruding forward from the periphery of the back plate 91. In the central portion of the back plate 91, an electric wire through hole 93 through which the electric wire 10 penetrates is formed.

  The peripheral plate 92 is formed with a pair of left and right engaging grooves 94 penetrating therethrough. The engagement groove 94 is configured to extend spirally so as to intersect the front-rear direction. The entrance of the engagement groove 94 extends in the front-rear direction, opens at both ends in the width direction at the front end of the peripheral plate 92, and continues to an introduction port 95 that can receive the engagement protrusion 43 from the front. The end of the engagement groove 94 is located slightly beyond the half circumference of the peripheral plate 92 from the introduction port 95, and is arranged in parallel behind the introduction port 95. At the end of the engagement groove 94, a bulge opening 96 having a diameter expanded toward the introduction port 95 is formed. An annular flange portion 97 is formed at the front end of the peripheral plate 92 so as to protrude over the entire circumference while covering the introduction port 95 from the outside.

Next, a method for assembling the terminal structure of the electric wire 10 according to the present embodiment will be described.
First, the caulking piece 24 is caulked to the core wire 11 at the end of the electric wire 10, and the terminal fitting 20 is connected to the electric wire 10. Further, the electric wire 10 is inserted into the electric wire insertion hole 33 of the cylindrical portion 31 so that the bracket 30 is positioned at the end portion of the electric wire 10, and the rubber plug 70 is inserted into the first accommodating space 39 of the cylindrical portion 31 from the rear. Then, the chuck member 60 is inserted into the second accommodation space 40 of the cylindrical portion 31 from the rear. When the chuck member 60 is inserted, the guide projection 66 is fitted into the guide groove 42 of the cylindrical portion 31, and the pair of left and right halves 61 are lightly fitted into the second accommodation space 40. At this time, the rear end portion of the chuck member 60 is disposed so as to protrude rearward from the rear end of the cylindrical portion 31.

  Next, the pressing member 90 is put on the cylindrical portion 31 from the rear, and the engaging protrusion 43 is caused to enter the introduction port 95 of the engaging groove 94. In this state, the pressing member 90 is advanced while being rotated about the axis along the forming direction of the engaging groove 94. Then, the engagement protrusion 43 is displaced along the engagement groove 94 toward the bulging opening 96, and accordingly, the front end surface of the back plate 91 presses the rear end surface of the rear wall 64, and the chuck member 60 is moved. Push forward. Thus, when the chuck member 60 moves forward and is inserted deeply into the cylindrical portion 31, the outer peripheral surface of the peripheral wall 62 slides on the tapered surface 41 of the cylindrical portion 31, and both halves 61 are reduced and deformed as a whole. And the opening dimension of the electric wire contact part 65 is reduced in diameter. Further, in the movement process of the chuck member 60, the guide protrusion 66 slides in the guide groove 42, so that the stability of the movement posture of the chuck member 60 is ensured. In this case, the allowance of the guide protrusion 66 to the guide groove 42 increases as the insertion depth of the chuck member 60 increases.

  When the chuck member 60 is inserted over substantially the entire length of the second housing space 40 and the engaging protrusion 43 reaches the bulging opening 96 of the engaging groove 94, the wire contact portion 65 is placed on the outer peripheral surface of the wire 10. The chuck member 60 is held in close contact with the electric wire 10 in a movement restricted state with a predetermined frictional force, and the outer peripheral surface of the peripheral wall 62 is in close contact with the taper surface 41 of the cylindrical portion 31 so that the chuck The member 60 is held in the movement restricted state with a predetermined frictional force on the bracket 30 (see FIGS. 1 and 3 to 6). As a result, the bracket 30 is fixed in a state where displacement in the axial direction is restricted with respect to the electric wire 10 via the chuck member 60.

  Further, as described above, when the chuck member 60 is inserted deeply into the cylindrical portion 31, the front end surface of the front wall 63 presses the rear end surface of the rubber plug 70 forward. Thereby, the rubber plug 70 is compressed in the front-rear direction between the back wall 37 of the cylindrical portion 31 and the front wall 63 of the chuck member 60, and accordingly, the outer peripheral surface of the rubber plug 70 is the inner peripheral surface of the cylindrical portion 31. And the inner peripheral surface of the rubber plug 70 strongly adheres to the outer peripheral surface of the electric wire 10.

  Thereafter, the terminal fitting 20 is inserted into the shield case 101 from behind through the attachment hole 102, and the attachment portion 32 is applied to the outer surface of the side wall of the shield case 101. In this state, the screw member 300 is screwed into the female screw hole 103 from the insertion hole 34 and the bracket 30 is attached to the side wall of the shield case 101. Further, the bolt 200 is screwed into the conductive portion 104 from the bolt hole 23 and the terminal fitting 20 is connected to the conductive portion 104 (see FIG. 8). Thereby, the terminal portion of the electric wire 10 is attached to the device 100 via the attachment portion 32 of the bracket 30. If the terminal fitting 20 and the conductive portion 104 are displaced from the normal connection position, the chuck member 60 is released from the chucked state by rotating the pressing member 90 in the opposite direction. In this state, the bracket 30 is displaced in the axial direction to reach an appropriate position, and the pressing member 90 is rotated forward again to bring the chuck member 60 into the chucked state.

  As described above, according to the present embodiment, the insertion depth of the chuck member 60 into the cylindrical portion 31 is increased, so that the chuck member 60 is connected to the inner peripheral surface (tapered surface 41) of the cylindrical portion 31 and the electric wire. Since the bracket 30 is in close contact with the outer peripheral surface 10 and the relative displacement of the bracket 30 with respect to the electric wire 10 is restricted, the electric wire 10 and the bracket 30 are fixed via the chuck member 60. Therefore, even if the bracket 30 is restricted from being displaced in the axial direction with respect to the electric wire 10 before being attached to the shield case 101, the terminal structure of the electric wire 10 can be provided even when the mold structure is abolished. Is done. In this case, the bracket 30 and the electric wire 10 are rigidly fastened via the chuck member 60, thereby preventing the bracket 30 from rattling during vibration of the electric wire 10.

  Moreover, since the rubber plug 70 is compressed between the chuck member 60 and the inner wall 37 of the cylindrical portion 31 by the deep insertion of the chuck member 60 into the cylindrical portion 31, the rubber plug 70 is connected to the cylindrical portion 31. The inner peripheral surface and the outer peripheral surface of the electric wire 10 are closely adhered to each other, and the sealing performance is improved.

  Further, when the pressing member 90 is rotated in the extending direction of the engaging groove 94, the engaging protrusion 43 is displaced along the engaging groove 94 and the chuck member 60 is pushed into the cylindrical portion 31. Therefore, the chuck member 60 can be pushed in easily and smoothly.

  In the process of moving the chuck member 60, the guide protrusion 66 slides on the groove surface of the guide groove 42, so that the chuck member 60 is moved and guided in the axial direction. The member 60 is prevented from being rotated, and as a result, the electric wire 10 is prevented from being twisted.

  Further, the guide groove 42 is configured to gradually increase its depth in the pushing direction of the chuck member 60, and the guide protrusion 66 is configured to gradually increase the allowance with the guide groove 42 in the pushing direction of the chuck member 60. Therefore, the stability of the moving posture of the chuck member 60 is improved as the pushing depth increases.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) Contrary to the said embodiment, the structure by which an engaging groove is formed in a cylinder part and an engaging protrusion is formed in a press member may be sufficient.
(2) Contrary to the above-described embodiment, the guide protrusion may be formed on the inner peripheral surface of the cylindrical portion, and the guide groove may be formed on the outer peripheral surface of the chuck member.
(3) The electric wire may be a shielded electric wire including a core wire, an insulating layer covering the outer periphery of the core wire, a braided wire surrounding the outer periphery of the insulating layer, and a sheath (covering) covering the outer periphery of the braided wire. .
(4) A screw structure (female screw and male screw) is formed on the inner peripheral surface of the pressing member and the outer peripheral surface of the cylindrical portion. It may be a configuration.

DESCRIPTION OF SYMBOLS 10 ... Electric wire 20 ... Terminal metal fitting 30 ... Bracket 31 ... Tube part 32 ... Mounting part 37 ... Back wall 41 ... Tapered surface 42 ... Guide groove 43 ... Engagement protrusion 60 ... Chuck member 66 ... Guide protrusion 70 ... Rubber plug 80 ... Seal ring 90 ... Pressing member 94 ... engagement groove 100 ... equipment

Claims (5)

A bracket having a cylindrical portion through which an electric wire is inserted, and a mounting portion that is integrally connected to the cylindrical portion and is attached to an attachment target;
A chuck member that is inserted into the cylindrical portion and increases in insertion depth, thereby closely contacting the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the electric wire, and restricting the displacement of the bracket relative to the electric wire; The terminal structure of the electric wire characterized by providing.   The rubber plug is fitted to the outer periphery of the electric wire and inserted into the cylinder part, and the chuck member is inserted deeply into the cylinder part so that the rubber plug is inserted into the inner part of the chuck member and the cylinder part. The terminal structure of an electric wire according to claim 1, wherein the terminal structure is compressed between walls.   A pressing member capable of pressing the chuck member is provided, and an engaging groove is formed in one of the pressing member and the cylindrical portion, and an engaging protrusion that enters the engaging groove is formed in the other. Further, when the pressing member is rotated in the extending direction of the engaging groove, the engaging protrusion is displaced along the engaging groove, and the chuck member is pushed into the cylindrical portion. Item 1. A terminal structure of an electric wire according to item 1 or 2.   A guide protrusion is formed on one of the outer peripheral surface of the chuck member and the inner peripheral surface of the cylindrical portion, and a guide groove is formed on the other. The electric wire terminal structure according to claim 3, wherein the chuck member is moved and guided in the axial direction when the guide protrusion slides on the groove surface of the guide groove.   The guide groove is configured to gradually increase the depth in the pushing direction of the chuck member, and the guide protrusion is configured to gradually increase the engagement margin with the guide groove in the pushing direction of the chuck member. The terminal structure of the electric wire according to claim 4.

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