JP4368664B2 - High voltage cord device - Google Patents

Description

  The present invention relates to a high-pressure cord device used when connecting an ignition coil unit and an ignition plug of an internal combustion engine.

  Conventionally, as shown in FIG. 7, the high-voltage cord device has a terminal cap 4 attached to one end of the high-voltage cord 3 in a plug cap 2 detachably attached to the spark plug 1. 2 is attached to the spark plug 1, and the coil portion 5 of the terminal tool 4 inside thereof is electrically connected to the plug terminal 6 of the spark plug 1 from the outer peripheral side (Patent Document 1).

  The high-voltage cord 3 is composed of an insulating outer skin layer 7 and a conductor 15 inside thereof. The terminal tool 4 includes a coil portion 5 disposed near the outside on one end side of the high-voltage cord 3, an extension portion 8 extending from one end side of the coil portion 5 to the high-voltage cord 3 side, and this extension The insertion portion 9 is inserted into the high-voltage cord 3 from the tip of the portion 8 by press-fitting or the like and is in contact with the lead 15 inside thereof, and is integrally processed with an elastic wire having an appropriate wire diameter and a circular cross section. Yes. The insertion portion 9 is shorter than the diameter of the high-voltage cord 3 so that the tip of the insertion portion 9 does not protrude to the opposite side of the high-voltage cord 3 when inserted into the high-voltage cord 3 by press fitting or the like.

  The plug cap 2 is formed with a coil holding portion 10 for holding the coil portion 5 of the terminal tool 4 on the inner end side, and a cap portion 11 to be fitted to the spark plug 1 and one end portion of the high-voltage cord 3 are watertight. And a cord holding part 12 for holding, and is generally integrally formed of rubber or other elastic material.

In addition, as shown in FIG. 8 (A), the terminal tool 4 is provided with one extending portion 8 on one end side of the coil portion 5, and a single type in which an insertion portion 9 is provided at the distal end of the extending portion 8. In addition, as shown in FIG. 8 (B), two extending portions 8 having different lengths are provided at both ends of the coil portion 5 with an interval to sandwich the high-voltage cord 3 from both sides in the diameter direction. There is a double type in which an insertion portion 9 for press-fitting into the high-pressure cord 3 is provided at the tip of each extension portion 8.
JP 2001-313147 A

  In this type of high-voltage cord device, the terminal tool 4 is attached to one end side of the high-voltage cord 3, and then the terminal tool 4 is placed so that the coil part 5 is placed in a predetermined position of the coil holding part 10 in the cap part 11. Is inserted into the plug cap 2 and assembled. In that case, the coil part 5 of the terminal tool 4 is inserted into the plug cap 2 from the cord holding part 12 side, and the tip of the high voltage cord 3 is inserted from the cap part 11 to the cord holding part 12 to hold the cord. There is a method in which the terminal tool 4 is accommodated in the cap part 11 while pulling the high-voltage cord 3 coming out of the part 12.

  However, the conventional attachment structure of the terminal 4 has the following problems. That is, in the case of a single type, since the terminal tool 4 is attached to the high voltage cord 3 with one insertion portion 9, the terminal tool 4 cannot be securely and firmly fixed to the high voltage cord 3. For this reason, when the terminal tool 4 is inserted into the cord holding part 12 from the coil part 5 side at the time of assembly, the terminal fitting swings left and right with respect to the high voltage cord 3 with the insertion part 9 as a fulcrum, and the insertion is very Have difficulty. Even when the high-voltage cord 3 is pulled through the cord holding portion 12 from the opening side of the cap portion 11, when the cap portion 11 is deep, the resistance due to the plug cap 2 is very large, and the insertion portion 9 has a high pressure. There is a risk of losing code 3.

  Further, even if the terminal tool 4 is incorporated in the plug cap 2, the terminal tool 4 is fastened to the high-voltage cord 3 with one short insertion portion 9, so that the high-voltage cord 3 and the terminal tool 4 are easily misaligned. 11, the coil portion 5 is not stabilized at an appropriate position, and when the coil portion 5 is attached to the spark plug 1 in a state where the coil portion 5 is displaced, the coil portion 5 may be deformed by the external force. When an external force is applied, there is also a problem that the high voltage cord 3 is detached from the terminal tool 4 and pulled out relatively easily.

  The double-type terminal 4 can prevent the displacement of the terminal 4 from the high-voltage cord 3 and the disconnection of the high-voltage cord 3 from the terminal 4 relatively easily. However, the manufacturing cost of the terminal 4 is lower than that of the single-type. In addition, the two extending portions 8 become obstructive when inserted into the plug cap 2 and the assembly is troublesome, and it is difficult to automate the operation of attaching the terminal device 4 to the high voltage cord 3.

  In view of such conventional problems, the present invention can easily and reliably fix the terminal fixture to the high-voltage cord with a simple structure, can be easily manufactured, assembled, etc., can prevent an increase in cost, and can be displaced, deformed, etc. after assembly. An object of the present invention is to provide a high-pressure cord device that can prevent the above-described problem and improve the tensile strength.

The present invention includes a coil portion 5 that is disposed near the outside on one end side of the high-voltage cord 3 and that is detachably fitted to the plug terminal 6 of the spark plug 1, and the high-voltage cord 3 side from one end side of the coil portion 5. A single type in which an extension portion 8 extended to the inside and an insertion portion 9 that is inserted into the high-voltage cord 3 from the tip of the extension portion 8 and comes into contact with the inner conductor 15 are formed integrally with an elastic wire. And a plug cap 2 that holds the one end side of the high-voltage cord 3 together with the terminal tool 4 and is removably attached to the spark plug 1 so that the coil portion 5 is connected to the plug terminal 6. In the high-voltage cord device, the high-voltage cord is formed on the opposite side of the extension portion 8 of the insertion portion 9 by bending the distal end side of the insertion portion 9 toward the one end side of the high-voltage cord 3 and between the extension portion 8. 3 has a bent portion 13 sandwiched from both sides in the diameter direction, the bending portion 3 of elastic wire are those outside of the diameter direction is obliquely cut toward the front end.

It is desirable that the insertion portion 9 is press-fitted into the high-voltage cord 3 and the bending portion 13 is formed by caulking. The side facing the least high voltage cord 3 of the insertion portion 9 side and near the bent portion 13 of the extension portion 8, has then desirable to bite into the insulating jacket layer 7 of the high voltage cord 3.

  According to the present invention, the terminal fixture 4 can be easily and reliably fixed to the high-voltage cord 3 with a simple structure, and the mounting work of the terminal fixture 4 can be easily automated. Can be prevented as much as possible, and the displacement of the coil portion 5 in the plug cap 2 after assembly, the deformation of the coil portion 5 due to the displacement, etc. can be prevented, and the high-voltage cord 3 is difficult to come off from the terminal 4. The tensile strength of 3 is also improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, about the same name thing as the past, the same code | symbol is attached | subjected and the description is abbreviate | omitted. 1-4 illustrate a first embodiment of the present invention.

  As shown in FIGS. 1 and 2, the high-voltage cord device includes a coil portion 5 that is disposed near the outer side on one end side of the high-voltage cord 3 and that is detachably fitted to the plug terminal 6 of the spark plug 1. An extension portion 8 extending from one end side of the coil portion 5 to the high-voltage cord 3 side, and an insertion portion inserted into the high-voltage cord 3 from the distal end of the extension portion 8 and in contact with the lead 15 inside the extension portion 8 9, and a plug that is removably attached to the spark plug 1 so that the one end side of the high-voltage cord 3 is held inside together with the terminal tool 4 and the coil portion 5 is connected to the plug terminal 6. The bending part 13 which includes the cap 2 and sandwiches the high-pressure cord 3 from both sides in the diametrical direction between the extension part 8 and the extension part 8 is provided on the opposite side of the extension part 8 of the insertion part 9.

  As shown in FIG. 3, the terminal tool 4 is formed by integrally forming a coil part 5, an extension part 8, an insertion part 9, and a bending part 13 with an elastic wire. The coil portion 5 is formed by winding an elastic wire several times in a spiral shape, and an extension portion 8 is provided on one end side of the coil portion 5 so as to protrude outward in a substantially diametrical direction with respect to the coil portion 5. Yes. The extension 8 is substantially parallel along the longitudinal direction of the high-voltage cord 3.

  The insertion portion 9 of the terminal tool 4 is bent in a substantially perpendicular direction from the tip of the extension portion 8 to the high-voltage cord 3 side, or in a state close thereto. As shown in FIG. 3, the side extends substantially straight with a length L longer than the diameter D (see FIG. 2A) of the high-voltage cord 3, and the tip portion that becomes the bent portion 13 is sharpened or tapered. ing.

Near the insertion portion 9 side of the extension portion 8 and at least the side facing the high-voltage cord 3 of the bent portion 13 bites into the insulating outer skin layer 7 of the high-voltage cord 3. In this embodiment, extension portion 8 substantially the entire length of the portion corresponding to the high voltage cord 3 is a part or all parts of the radial direction and cuts into the insulating jacket layer 7, also the bending portion 13 one Near the insertion portion 9 side and at least the side facing the high voltage cord 3 of the bending portion 13 in the insulation outer skin layer 7 of the high voltage cord 3 so that the portion is substantially flush with the outer circumferential surface of the insulating skin layer 7 or slightly protrudes from the outer circumferential surface. Have bite into.

  When the elastic wire is cut obliquely with a nipper or other tool and the tip portion is formed in a sharp or tapered shape, the bending direction side of the wire becomes longer as shown in FIG. It is desirable to cut it. Of course, as shown in FIG. 4B, the wire may be cut so that the side opposite to the bending direction becomes longer.

  As shown in FIG. 3, the terminal device 4 extends substantially straight from the insertion portion 9 to the bent portion 13 side, and the length thereof is longer than the diameter of the high-voltage cord 3. Therefore, the length from the insertion portion 9 to the tip is slightly longer than that of the conventional single-type terminal tool 4, and it is not necessary to greatly change the shape and structure of the terminal tool 4 itself. The terminal tool 4 can be manufactured easily and inexpensively.

  When attaching the terminal tool 4 to the high-voltage cord 3, for example, using an automatic machine having a caulking function, etc., holding the distal end portion of the insertion portion 9 of the terminal tool 4 in a state of being applied to the high-voltage cord 3, The insertion portion 9 is pressurized from the extending portion 8 side to the high-pressure cord 3 side by the pressurizing tool and is press-fitted into the high-pressure cord 3.

  Then, the distal end portion that passes through the high-voltage cord 3 and exits on the opposite side is received by a receiving tool, and the distal end portion is bent to the same side as the extension portion 8 with respect to the insertion portion 9, and then the bent portion 13 is tightened. Form. At this time, a sharp or tapered portion on the tip side is guided along the shape of the receiving surface of the receiving tool, and the tip is bitten into the insulating outer skin layer 7 side of the high-voltage cord 3. In addition, the relative stroke between the pressurizing tool and the receiving tool, the pressurizing force, and the like are set as appropriate so that the vicinity of the insertion portion 9 side of the extension portion 8 and the side facing the high-pressure cord 3 of the bending portion 13 are within the insulating outer skin layer 7. To bite into.

  Thus, by providing the bending portion 13 that sandwiches the high-voltage cord 3 from both sides in the diameter direction between the extension portion 8 and the extension portion 8 of the insertion portion 9, the terminal tool 4 can be formed with a simple structure. Can be easily and securely fixed to the high-voltage cord 3, and the attachment work of the terminal 4 can be easily automated. Manufacturing, assembly, etc. are easy and cost increase can be prevented as much as possible. Thus, the displacement of the coil portion 5 and the deformation of the coil portion 5 caused by the displacement can be prevented, and the high-voltage cord 3 is difficult to be detached from the terminal tool 4 and the tensile strength of the high-voltage cord 3 is improved.

  In particular, by inserting the insertion portion 9 into the high-voltage cord 3 and forming the bent portion 13 by caulking, the terminal tool 4 can be more reliably fixed by a simpler operation. Further, the vicinity of the insertion portion 9 side of the extension portion 8 and at least the side of the bending portion 13 facing the high-voltage cord 3 bite into the insulating outer skin layer 7 of the high-voltage cord 3. The high voltage cord 3 can be securely clamped from both sides in the diametrical direction by the portion 13, and the terminal device 4 can be more firmly fixed to the high voltage cord 3.

  The distal end portion of the insertion portion 9 is sharp or tapered, and the bending portion 13 is formed by bending the sharpened or tapered distal end portion to the same side as the extension portion 8 with respect to the insertion portion 9. Therefore, formation of the bending part 13 is easy and it can crimp with a comparatively small crimping force. In addition, when the elastic wire is cut obliquely and the tip portion is formed in a sharp or tapered shape, if the wire is cut so that the bending direction side is long, bending processing by caulking of the tip portion is possible. This is very easy, and the caulking makes it easy for the tip to bite into the insulating outer skin layer 7 of the high-voltage cord 3, and the possibility of injury due to the sharp or tapered tip portion during subsequent handling can be reduced. .

  FIG. 5 illustrates a second embodiment of the present invention. In this embodiment, a bending portion 13 that is curved in a J-shape is formed on the distal end side of the insertion portion 9, and the distal end side of the bending portion 13 bites toward the lead core 15 side. In this case, when crimping the distal end side of the insertion portion 9, the bending portion is guided by guiding the distal end toward the high-voltage cord 3 while bending the insertion portion 9 on the same side as the extension portion 8. 13 is inserted into the high-voltage cord 3. This further secures the fixing of the terminal tool 4 to the high voltage cord 3.

  FIG. 6 illustrates a third embodiment of the present invention. In this embodiment, a bent portion 13 that is substantially parallel to the longitudinal direction of the high-voltage cord 3 is formed at the distal end side of the insertion portion 9, and a biting portion 14 that bites into the high-voltage cord 3 side is formed at the distal end of the bent portion 13. ing. Note that the extending portion 8 and the bent portion 13 partially bite into the insulating outer skin layer 7. In this case, after press-fitting into the high-voltage cord 3 up to the insertion portion 9, the biting portion 14 is bent, and then the bending portion 13 is bent and crimped to cause the biting portion 14 to bite into the high-voltage cord 3. This further secures the fixing of the terminal tool 4 to the high voltage cord 3.

As mentioned above, although the Example of invention was explained in full detail, this invention is not limited to this Example, A various change is possible within the range which does not deviate from the meaning. For example, in the embodiment, the bending portion 13 is formed on the opposite side of the extension portion 8 of the insertion portion 9 and the high-voltage cord 3 is inserted between the extension portion 8 and the bending portion 13 from both sides in the diameter direction. A press-fitting caulking method is adopted in which the portion 9 is press-fitted and caulked, but after inserting the insertion portion 9 into a hole drilled in the high-pressure cord 3 , the protruding end is the same as the extension portion 8 with another tool or the like A method other than that of the embodiment may be employed, such as forming the bent portion 13 by bending it to the side.

  Further, if the extension portion 8 and the side of the bent portion 13 facing the high-voltage cord 3 bite into the insulating outer layer 7 of the high-voltage cord 3, the terminal 4 can be securely fixed to the high-voltage cord 3. The terminal tool 4 can be fixed more reliably as the amount of biting increases. The bent portion 13 may be formed by bending a sharp or tapered tip portion, or may be formed by bending a wire within a range including the sharp or tapered shape.

  The bending angles of the extending portion 8 and the inserting portion 9, and the inserting portion 9 and the bending portion 13 do not have to be substantially right angles, and may be bent in a circular arc shape. In the embodiment, the distal end side from the extending portion 8 is set as the insertion portion 9, and the insertion portion 9 is inserted into the high-pressure cord 3 by press-fitting. For example, an insertion hole is formed in the high-pressure cord 3 with a pin or the like, The bent portion 13 may be formed by inserting a portion on the distal end side from the extending portion 8 into the insertion hole and then bending the distal end. Therefore, it is sufficient that the insertion portion 9 on the distal end side from the extending portion 8 is a portion that can be inserted into at least the high-voltage cord 3. In this case, the bent portion 13 does not need to be formed in a sharp shape or a tapered shape. In each of the embodiments, the insertion portion 9 is inserted so as to cross at a substantially right angle with respect to the lead core 15, but the insertion portion 9 is not necessarily in contact with the lead core 15 and is opposite to the extension portion 8. If the bending part 13 can be provided in the front-end | tip of this, the structure which the insertion part 9 crosses with respect to the conducting core 15 in a square shape may be sufficient.

It is sectional drawing of the high voltage | pressure cord apparatus which shows the 1st Example of this invention. (A) is a cross-sectional view of a high voltage cord and a terminal device showing a first embodiment of the present invention, (B) is a plan view thereof, and (C) is a bottom view thereof. It is a front view of the terminal fixture which shows the 1st Example of this invention. (A) (B) is a front view of the front end side of the terminal device which shows the 1st Example of this invention. It is sectional drawing of the high voltage | pressure cord and terminal fixture which show the 2nd Example of this invention. It is sectional drawing of the high voltage | pressure cord and terminal fixture which show the 3rd Example of this invention. It is sectional drawing of the conventional high voltage | pressure cord apparatus. (A) (B) is a perspective view of the conventional terminal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spark plug 2 Plug cap 3 High voltage cord 5 Coil part 6 Plug terminal 7 Insulation outer skin layer 8 Extension part 9 Insertion part 13 Bending part 15 Conductor

Claims (3)

A coil portion (5) disposed near the outside on one end side of the high-voltage cord (3) and detachably fitted to the plug terminal (6) of the spark plug (1), and one end of the coil portion (5) wherein from the side high voltage cord (3) extending out the extended portion to the side (8), the extending portion from the tip of the inside are inserted in the high voltage cord (3) of (8) Shirubeshin (15 ) And a single type terminal tool (4) integrally formed of an elastic wire with an insertion portion (9) in contact with the terminal tool (4) and holding one end side of the high-voltage cord (3) together with the terminal tool (4). In the high voltage cord device comprising a plug cap (2) detachably attached to the spark plug (1) so that the coil portion (5) is connected to the plug terminal (6), the insertion portion (9) the extending portion on the opposite side (8), the distal end side of the insertion portion (9) the high voltage cord (3 Wherein the high voltage cord (3) bending sandwich from both sides in the diameter direction portion between the one end is formed by bending into a side and the extending portion (8) has a (13), the bending portion (13) The elastic wire is characterized in that the outside in the diameter direction is cut obliquely toward the tip . The high pressure cord device according to claim 1, wherein the insertion portion (9) is press-fitted into the high pressure cord (3), and the bent portion (13) is formed by caulking. Near the insertion portion (9) side of the extension portion (8) and at least the side of the bending portion (13) facing the high-voltage cord (3) is in the insulating outer skin layer (7) of the high-voltage cord (3). The high voltage cord device according to claim 1, wherein the high voltage cord device is bitten.

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