JP2008269892A - Electric insulated cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric insulated cable capable of preventing water from running between a core material and a coating layer of the cable, and allowing the core material to be easily taken out by simply peeling off the coating layer. <P>SOLUTION: In a sensor cable device used for electrically connecting a wheel speed sensor element enclosed in a housing to an ECU outside the housing through this electric insulated cable 1, the electric insulated cable 1 is provided with the core material 11 comprising core materials each comprising a conductor 111 and an insulating coating layer 112 covering it, a covering layer 12 covering the core materials 11, and a sheath 13 covering the covering layer 12. Powder 14 is intermittently applied to the outer periphery of each covering layer 12 being an interfacial surface to the core material 11 along the longitudinal direction of the electric insulated cable 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electrically insulated cable that can easily peel off a covering layer while ensuring airtightness inside the covering layer.

Recently, with the progress of car electronics, various control systems such as an anti-lock brake system (ABS) have been installed in automobiles.
For example, in the case of this ABS, a speed sensor for detecting the rotational speed of the wheel is attached in the vicinity of the wheel, and an electric signal generated by the speed sensor is transmitted to an ECU (Electric Control Unit) with a cable, and this ECU A method of operating the actuator by transmitting the calculated electric signal to the actuator through a cable is employed.

Since the speed sensor is used in an environment where the vehicle is exposed to water while the automobile is running, not only the wheel speed sensor itself but also a connection portion between the sensor and the cable is required to be waterproof. FIG. 5 shows a conventional example of a sensor cable device having a structure that ensures waterproofness of a connection portion between a sensor and a cable (Patent Document 1). The sensor cable device 110 shown in FIG. 5 seals the sensor 106 and wraps the end portion of the cable 100 when the housing material resin is formed by injection molding of the housing material resin. Are heat-sealed.
Japanese Patent No. 3428391

  Even if the housing and the cable are heat-sealed as in the above-mentioned Patent Document 1, if water intrudes between the core material and the sheath, or between the core material and the coating layer, There is a risk that water may enter the housing or the ECU. Therefore, it is necessary to take measures to prevent water from running inside the cable, such as forming these layers with an adhesive resin.

  On the other hand, when the core material is stripped from the cable and connected to an external electronic component (extruding operation), if the core material and the covering layer are firmly fixed, the extracting operation is not performed. Have difficulty.

  The present invention has been made in view of the above circumstances, and can prevent water from running between the core material of the cable and the coating layer, and at the same time, can easily remove the coating layer and take out the core material. An object is to provide an electrically insulated cable and a sensor cable device.

The above problem can be solved by the following means.
1. An electrically insulating cable comprising a core material comprising a conductor and an insulating layer covering the conductor, and a covering layer covering the core material, wherein the covering layer is easily peeled off at the interface between the core material and the covering layer. An electrically insulating cable characterized in that a peelability imparting means is provided intermittently along the length direction of the electrically insulated cable.
2. 2. The electrically insulated cable as described in 1 above, wherein the peelability imparting means is powder.
3. An electrically insulating cable comprising a core material composed of a conductor and an insulating layer covering the conductor, and a covering layer covering the core material, wherein an adhesive is attached to the interface between the core material and the covering layer of the electrically insulating cable. An electrically insulated cable characterized by being applied intermittently along the length direction.
4). The above 1 to 3, wherein a sheath for covering the covering layer is provided, and on the outer peripheral surface of the sheath, display means for confirming the location where the peelability imparting means or the adhesive is provided is provided. The electrically insulated cable according to any one of 3 above.

  In the electrically insulated cable of the present invention, since a region where no powder or adhesive that imparts peelability is applied is intermittently provided between the core material of the cable and the coating layer covering the cable, the region The core material can be easily taken out by peeling off the coating layer by using, so that the mouth-out operation becomes easy. Moreover, even when water permeates between the core material and the coating layer, since there is a region where the powder is not applied and a region where the adhesive is applied, it is possible to prevent water from running between them.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.
(First embodiment)
FIG. 1 shows a sensor cable device 10 according to a first embodiment of the present invention. The sensor cable device 10 includes an electrically insulated cable 1 and a wheel speed sensor element 2 connected to one end of the electrically insulated cable 1. FIG. 1 shows a state in which an ECU (Electronic Control Unit) 3 that is an arithmetic processing unit is connected to the other end side of the electrically insulated cable 1 of the sensor cable device 10.

  FIG. 2 is a cross-sectional view showing the configuration of the electrically insulated cable 1 according to this embodiment. As shown in FIG. 2, the electrically insulated cable 1 includes a core material 11, a coating layer 12 covering the core material 11, and a sheath 13 covering the coating layer 12, and the two core materials 11 are bundled. A covering layer 12 and a sheath 13 are sequentially laminated around the periphery. Powder 14 is intermittently applied along the length direction of the electrically insulated cable 1 on the outer peripheral surface of the core material 11, which is an interface between the core material 11 and the coating layer 12.

The two core members 11 are twisted together in the longitudinal direction thereof, and the flexibility with respect to the bending of the electrically insulated cable 1 is improved.
Each core material 11 includes a conductor 111 and an insulating layer 112 covering the conductor 111. For the conductor 111, a wire such as copper or a copper alloy drawn to a small diameter is used. The insulating layer 112 is formed using an insulator such as polyvinyl chloride or flame retardant polyethylene.
In addition, the diameter of one core material 11 is good to be set to 1.0 mm or more and 2.0 mm or less, and 1.7 mm is a preferable example.

The covering layer 12 can be formed using a resin such as ethylene vinyl acetate copolymer resin (EVA) or urethane elastomer. Among them, EVA is preferable because it has high adhesion to the insulating layer 112 described above, and can improve the airtightness between the core material 11 and the coating layer 12.
The thickness of the coating layer 12 can be set within a range of 0.3 mm to 1.5 mm.

When a highly adhesive resin such as EVA is used for the covering layer 12 as described above, the core material 11 and the covering layer 12 are firmly fixed, and the electrical insulation cable 1 is connected to the ECU or the like. In addition, it may be difficult to expose the coating layer 12.
Therefore, in the present embodiment, the powder 14 is intermittently applied along the length direction of the electrically insulated cable 1 in order to impart peelability to the interface between the core material 11 and the coating layer 12.

  That is, as shown in FIG. 3, a region (powder region α) where the powder 14 is applied on the core material 11 along the length direction of the electrically insulated cable 1 and a region where the powder is not applied (non-powder region). β) are alternately formed. In the powder region α, since the adhesion between the core material 11 and the coating layer 12 is small, the coating layer 12 can be easily peeled off from the core material 11. Further, in the non-powder region β, the adhesion between the core material 11 and the coating layer 12 is high, and water can be prevented from running further than that, so that water is externally provided between the core material 11 and the coating layer 12. It is possible to prevent troubles such as the water running to the tip when entering. The installation length of the powder region α and the non-powder region β may be set to the minimum necessary length that allows the coating layer 12 to be peeled off easily and reliably. As an example, the length per one part of the powder region α is preferably 50 to 5000 mm, and the length per one part of the powder region β is preferably 5 to 500 mm.

As the powder 14, for example, talc (pulverized talc (hydrated magnesium silicate) in powder form) or the like that imparts releasability between the core material 11 and the coating layer 12 may be used.
In order to form the powder region α and the non-powder region β on the core material 11 as shown in FIG. 3, for example, first, the powder 14 is applied over the entire length of the core material 11, When sending out at a constant speed, air can be blown onto the core material 11 at regular time intervals using appropriate means, so that the applied powder 14 can be removed intermittently to form efficiently. it can.

Although it does not specifically limit as a material used for the sheath 13 (FIG. 2), in order to have a softness | flexibility and mechanical intensity | strength together and to prevent water from running between the coating layers 12, with the coating layers 12 A material having high adhesiveness between them is suitable. As will be described later, when the housing 21 (FIG. 1) and the sheath surface are heat-sealed, it is preferable to use a material suitable for heat-sealing with the housing 21. As a material having such characteristics, for example, a compound such as a blended product of a polyurethane elastomer and a polyester elastomer can be used.
Moreover, you may provide the flame retardance requested | required of the cable for motor vehicles etc. by mix | blending a flame retardant with the material of the sheath 13 suitably.

  In the sheath 13, a colored portion 15 is provided on the outer peripheral surface corresponding to the coated portion of the powder 14 as shown in FIG. 1 so that the powder region α can be easily confirmed from the outside. By displaying the portion where the powder 14 is applied on the surface of the cable in this way, it is possible to easily perform terminal processing at this portion. In order to display the position of the powder region α, in addition to coloring the sheath surface, characters or the like may be printed, or marks or the like may be stamped. As an example, the length of the powder region is set to a predetermined length, and the interval between them is set to a predetermined interval. When the powder is intermittently removed with air, the distance from the position where the air is blown to the marking location and the time when the location where the air is not blown (powder region α) reach the marking location are known. While the powder region α adds a marking location, the location is marked.

  As described above, in the electrically insulated cable of the present embodiment, the powder region α and the non-powder region β on which the powder 14 is applied are provided on the core material 11. That is, by providing intermittently the powder region α in which the powder 14 is applied to the interface between the core material 11 and the coating layer 12, the peelability can be improved in the powder region. Can be removed. On the other hand, by providing the non-powder region β intermittently, airtightness can be improved at the same time. Therefore, even if water enters the interface between the core material 11 and the coating layer 12, it can be stopped at the non-powder region β.

  The wheel speed sensor element 2 (FIG. 1) is installed near the wheel for ABS or the like, and an electromagnetic pickup type sensor or a sensor using a Hall element is used. Since the wheel speed sensor element 2 is installed in the vicinity of a wheel that may be wet, it is necessary to keep it in an airtight state. Accordingly, the wheel speed sensor element 2 is electrically connected to the lead-out conductor 111 of the electrically insulated cable 1 and then sealed with an appropriate resin forming the housing 21.

At this time, the housing resin material is injection molded to seal the wheel speed sensor element 2, and at the same time, the outer periphery of the terminal portion of the electrically insulated cable 1 is wrapped and the housing 21 and the outer peripheral surface 131 of the sheath 13 are heat-sealed. Yes. By forming the housing 21 in this way, sufficient airtightness can be ensured between the housing 21 and the cable 1.
As the housing resin material, a polyester resin such as BTB (polybutylene terephthalate) or a polyamide resin such as 6,12-nylon can be used.

Next, a method for attaching the sensor cable device 10 according to the present embodiment to a vehicle will be described.
In order to attach the sensor cable device 10 to a vehicle, first, the wheel speed sensor element 2 sealed by the housing 21 is installed at a predetermined position near the wheel. On the other hand, in order to connect the other end side of the electrically insulated cable 1 to the ECU 3 installed in another place in the vehicle, it is determined how much the appropriate length of the electrically insulated cable 1 is. And since the part corresponding to the powder area | region (alpha) (FIG. 3) is displayed on the surface of the electrically insulated cable 1 by the colored part 15, the electrically insulated cable 1 is cut | disconnected by the colored part 15 corresponding to the length. .

  Next, in order to perform the lead-out operation from the other end portion of the cut electrically insulated cable 1, the sheath 13 and the covering layer 12 are peeled off to an appropriate length. Since the stripping operation can be performed in the powder region α to which the peelability is imparted, the stripping operation of the sheath 13 covering layer 12 can be easily performed. Finally, the conductor 111 and the ECU 3 that are exposed by peeling off the insulating layer 112 at the other end of the lead-out electrically insulated cable 1 are connected.

(Second Embodiment)
Next, a sensor cable device including an electrically insulated cable according to the second embodiment of the present invention will be described.
The electrically insulated cable of the sensor cable device of the present embodiment is an electrically insulated cable in which an adhesive is applied to the outer peripheral surface of the core material instead of intermittently applying the powder 14 to the outer peripheral surface of the core material 11 in the first embodiment. It is applied intermittently along the length direction.

  According to this embodiment, similarly to the electrically insulated cable 1 of the first embodiment, the coating layer can be easily peeled from the non-adhesive region where the adhesive is not applied. Moreover, even if water enters between the core material and the coating layer, it is possible to simultaneously prevent water from running further in the adhesive region where the adhesive is applied.

  The present invention is not limited to the embodiment described above, and can be implemented in various forms without departing from the gist of the present invention. For example, in the first and second embodiments, the configuration in which the sheath 13 is further provided on the outer periphery of the coating layer 12 is shown, but the configuration in which the sheath 13 is not provided may be used.

Next, examples of the present invention will be described.
In this example, for example, an electrical insulation cable 1 having the same structure as that of the electrical insulation cable 1 used in the first embodiment is prepared with a length of 80 to 100 cm. As an example, the length of a portion with powder is 480 mm, the length of a portion without powder is 20 mm, and two portions with and without powder are provided. On the other hand, as a comparative example, an electrically insulated cable having the same configuration as that used in the first embodiment and having the same length, but not intermittently along the length direction of the electrically insulated cable. An electrically insulated cable 5 having a structure in which the powder 14 is applied over the entire length of the insulated cable without any gap is prepared. And the comparative experiment which investigates the passage state of the air in the electrical insulation cables 1 and 5 when the air pressure of fixed pressure was sprayed from the one end surface of both the electrical insulation cables 1 and 5, respectively.
That is, as shown in FIG. 4, an air pressure of 5.00 × 10 ⁵ Pa (about 5 times the atmospheric pressure) is fed from one end face of both the electrically insulated cables 1, 5, and both electrically insulated cables 1, 5 The other end was immersed in water in the water tank 6 and the amount of air coming out from the other end was examined.

  As a result, in the electrical insulation cable 5 of the comparative example in which the powder 14 is applied almost uniformly over the entire length, 0.3 cc of air passes between the core material 11 and the coating layer 12 and the others. It was detected that it was ejected from the end face. On the other hand, in the electrically insulated cable 1 of the present embodiment, it was confirmed that the passage of air inside was substantially prevented (the amount of passage was substantially zero). Thereby, knowledge that airtightness was securable was obtained by forming non-powder field field β like this example.

It is a lineblock diagram showing the sensor cable device provided with the electric insulation cable concerning a 1st embodiment of the present invention. It is the II sectional view taken on the line in FIG. It is a fracture view which shows the electrically insulated cable part which concerns on 1st Embodiment. It is explanatory drawing explaining the comparative experiment of the Example and comparative example of this invention. It is sectional drawing which shows an example of the conventional sensor cable apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrically insulated cable 10 Sensor cable apparatus 11 Core material 111 Conductor 112 Insulating layer 12 Covering layer 13 Sheath 14 Powder (peelability provision means)
2 Wheel speed sensor element (sensor)
21 Housing 3 ECU (electronic control unit)

Claims (4)

An electrically insulated cable comprising a conductor and a core material made of an insulating layer covering the conductor, and a covering layer covering the core material,
Peelability imparting means for facilitating peeling off the coating layer is provided intermittently along the length direction of the electrically insulated cable at the interface between the core material and the coating layer. Electrically insulated cable.   The electrically insulated cable according to claim 1, wherein the peelability imparting means is powder. An electrically insulated cable comprising a conductor and a core material made of an insulating layer covering the conductor, and a covering layer covering the core material,
An electrical insulation cable, wherein an adhesive is intermittently applied along the length direction of the electrical insulation cable at an interface between the core material and the covering layer.   2. A sheath provided to cover the covering layer, and a display means for confirming a location where the peelability imparting means or the adhesive is provided is provided on an outer peripheral surface of the sheath. Electrically insulated cable in any one of -3.

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