JPH07264745A - Sensor cable - Google Patents

Abstract

PURPOSE:To provide a sensor cable used for a rotation sensor that requires waterproof and anti-vibration characteristics in a simple manufacturing step, along with liability in sealing of a protective member at a drawing part of the cable. CONSTITUTION:An outer cover 3 of a coated wire 1 has an uneven part 4 formed in a thermoforming step, and a protective member 5 is formed around the uneven part 4 in a molding step. In this case, a fastener 7 of a tearing apparatus has an uneven part 8 and a heater 9. Since the uneven part 4 is formed when a wire is held by the fastener 7, a conventional roughening step for the cable face can be omitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable used for transmitting an output signal of a sensor such as a wheel rotation sensor, and more particularly, a protective member for protecting a cable lead-out portion from the sensor is provided on the jacket of a covered electric wire. Cable and a method of manufacturing the cable.

[0002]

2. Description of the Related Art Since the above-mentioned rotation sensor is used under severe conditions, it is required to have excellent waterproofness, vibration resistance and impact resistance. In order to meet this requirement, a method has been adopted in which the sensor cable is provided with a protective member on the outer cover, and the member is used to reinforce and protect the cable lead-out portion from the sensor, and at the same time enhance the sealing performance of the lead-out portion.

The protective member may be attached by tightly fitting a rubber bushing which has been processed separately, but recently, from the viewpoint of productivity, it is directly formed by molding a resin on the cable jacket. It is getting more and more. If the protective member formed by this molding is formed on the outer surface of the outer surface that is still smooth, the adhesion with the outer covering is poor and the reliability of the seal is not sufficiently improved. Therefore, in Japanese Unexamined Patent Publication No. 4-72575, after the cable end for cable connection is stripped, the outer surface of the protective member installation portion is roughened by machining such as polishing. It is shown that the protective member is provided by molding on the upper portion.

[0004]

As described above, when the surface of the jacket is roughened in advance, the adhesion between the protective member and the jacket is improved. However, in this method, the roughening treatment is performed separately from the terminal treatment of the cable. Since a surface-imparting process is required, productivity is inevitably reduced and cost is inevitably increased due to an increase in the number of processing steps.

Therefore, it is an object of the present invention to provide a sensor cable which can be roughened by a cable gripping tool of a peeling machine when the outer cover of a terminal is stripped, and a method of manufacturing the cable.

[0006]

In order to solve the above-mentioned problems, in the present invention, an uneven surface formed by thermoforming is provided on the outer surface of the protective member installation portion, and a resin-made protective member is provided on the outer periphery of the uneven formation portion. The cable structure is provided by molding. When the outer cover and the protective member are made of the same kind of thermoplastic resin, they are fused to each other to further improve the adhesion.

In this sensor cable, the cable gripping tool of the peeling machine for stripping off the jacket of the cable terminal is provided with a concave-convex molding surface and heating means for the surface, and the concave-convex portion is used to grip the electric wire when stripping the jacket of the cable terminal. It is manufactured by the method of processing with a tool.

[0008]

When the cable end is stripped off, it is necessary to grip the outer circumference of the cable in the vicinity of the stripped portion with a gripping tool such as a chuck. In the present invention, since the gripping tool heated by the heating means is used to make the outer surface of the jacket uneven by utilizing this indispensable gripping operation, the number of working steps is not increased.

Further, the unevenness due to embossing can increase the surface area much differently from the fine unevenness due to polishing or the like, and has a high mechanical locking force, so that the outer cover and the protection member are firmly integrated. , The sealing performance between them will be higher than before.

[0010]

FIG. 1 shows an example of a sensor cable of the present invention including a manufacturing method.

FIG. 1A shows a covered electric wire 1 in which a covered cord 2 is covered with a jacket 3 made of a thermoplastic resin. This wire is stripped of the jacket of the terminal by a required length using a peeling machine having a cutter 6. The work is performed by cutting the outer cover 3 with the cutter 6, and then moving the cutter in the direction of the arrow to remove the outer cover that has been cut. At this time, naturally, the electric wire is grasped and fixed by the chuck 7 of the peeling machine. Then, the unevenness 8 is processed on the inner surface of the chuck 7, and the electric wire 1 is gripped by the chuck 7 heated by the heater 9 by incorporating the heater 9 in the chuck 7.

As a result, the inner surface of the chuck having the unevenness 8 becomes a molding surface, and the unevenness 4 shown in FIG.
Is attached. Therefore, a molding die is put on the outer periphery of the concave-convex shaped portion, and a thermoplastic resin preferably made of the same material as that of the jacket 3 is poured into the molding die to produce the protective member 5.

FIG. 3 shows an example of use of the sensor cable 10 of the present invention manufactured as described above. 20 is a sensor head of an electromagnetic power generation type rotation detecting device used in combination with a gear sensing rotor (not shown). In this sensor head, components such as the magnet 21, the magnetic pole piece 22, and the coil 23 are generally sealed with a molding resin 24. When this molding resin 24 is made the same as the material resin of the protection member 5 and a part of the protection member 5 is embedded in the molding resin 24, the interface between the inner and outer peripheries of the protection member is completely closed and excellent sealing performance is obtained. Will be obtained.

[0014]

As described above, according to the sensor cable and the method of manufacturing the same of the present invention, it is possible to form the surface of the cable and the surface of the cable at the same time when the cable end is peeled off so as to improve the adhesion with the protective member. Therefore, there is no decrease in productivity due to an increase in the number of processing steps, and a cable with a high sealing performance can be obtained at a lower cost than conventional products.

[Brief description of drawings]

FIG. 1A is a view showing a manufacturing method of the present invention, and FIG. 1B is a partially cutaway side view of a sensor cable manufactured by the above method.

FIG. 2 is a sectional view showing an example of use of the sensor cable of the present invention.

[Explanation of symbols]

 1 Covered Electric Wire 2 Covered Cord 3 Outer Cover 4 Unevenness 5 Protective Member 6 Cutter 7 Chuck 8 Unevenness 9 Heater 10 Sensor Cable

Claims (3)

[Claims] 1. A sensor cable in which a protective member for protecting a cable lead-out portion from the sensor is provided on an outer sheath of a covered electric wire for transmitting an output signal of the sensor, by thermoforming on a surface of the outer sheath of the protective member installation portion. A sensor cable, which is characterized in that unevenness is provided, and a resin-made protective member is provided by molding on the outer circumference of the unevenness forming portion. 2. The sensor cable according to claim 1, wherein the outer cover and the protective member are formed of the same kind of thermoplastic resin and are fused together. 3. A cable gripping tool of a peeling machine for stripping off the jacket of the cable end is provided with an uneven molding surface and heating means for the surface, and the unevenness is processed by the wire gripping tool when stripping the jacket of the cable terminal. A method for manufacturing the sensor cable according to claim 1.