JP2012087829A - Fiber inner cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inner cable having a core of a fiber bundle of aramid fiber in which the bending radius of the inner cable can be reduced and cracks and peelings of a resin layer can be prevented.SOLUTION: The inner cable is constituted by forming a core 1 of the fiber bundle of the aramid fiber, covering the outer periphery of the core 1 with a mesh body 2 formed into a tubular shape, and covering the outer periphery of the mesh body 2 with thermoplastic resin. Especially, fluorocarbon resin or the aramid fiber is used in the mesh body.

Description

  The present invention relates to an inner cable technology.

  Conventionally, an inner cable having a synthetic fiber such as an aramid (polyparaphenylene terephthalamide) fiber as a core has been known. Such an inner cable is excellent in that it is lightweight because no metal wire is used and corrosion does not occur. Therefore, an inner cable has been proposed in which a fiber bundle of aramid fibers is used as a core, and a fiber bundle of aramid fibers or a single wire of synthetic resin is wound around the outer periphery (see, for example, Patent Document 1).

  However, in the case of an inner cable having a structure in which an aramid fiber or the like is further wound around the outer periphery of an aramid fiber, the aramid fiber or the like wound around the bent portion of the inner cable does not stretch, so that the flexibility is not sufficient and the bending radius cannot be reduced was there. In addition, in the resin layer of the synthetic resin formed on the outer periphery, cracks and peeling may occur at the bent portion of the inner cable due to the difference in elongation between the synthetic resin and the adherend to which the synthetic resin is bonded. It was.

Japanese Utility Model Publication No. 5-50142

  The present invention has been made to solve such a problem, and in an inner cable having an aramid fiber bundle as a core, the bending radius of the inner cable can be reduced, and the resin layer can be prevented from cracking and peeling. The purpose is to provide.

Next, means for solving this problem will be described.
That is, in the first invention, a fiber bundle of aramid fibers is used as a core,
Cover the outer periphery of the core with a tubular mesh body,
An inner cable in which an outer periphery of the mesh body is covered with a thermoplastic resin.

  A second invention is an inner cable, wherein the mesh body is made of a synthetic resin.

  A third invention is an inner cable, wherein the synthetic resin is a fluororesin.

  4th invention is an inner cable characterized by the said mesh body consisting of the fiber bundle of an aramid fiber.

  As effects of the present invention, the following effects can be obtained.

  According to the first invention, since the mesh body expands and contracts according to the bending of the inner cable, the flexibility of the inner cable is improved and the bending radius can be reduced. In addition, since the mesh body expands and contracts in accordance with the bending of the inner cable, the difference in elongation between the mesh body and the resin layer is reduced, and it becomes possible to prevent cracking and peeling of the coating layer.

  According to the second invention, since the mesh body is formed using the synthetic resin, the manufacturing cost of the inner cable can be reduced. Moreover, since it can be reduced in weight compared with a metal mesh body and has no electrical conductivity, it can contribute to safety improvement such as prevention of influence on electronic equipment due to formation of electric and magnetic fields and prevention of leakage.

  According to the third invention, since the mesh body is formed using the fluororesin, the slidability between the mesh body and the core made of the aramid fiber is improved, and the bending radius of the inner cable can be further reduced. Become.

  According to the fourth aspect of the invention, since the mesh body is formed using the fiber bundle of aramid fibers, the material of the constituent elements can be unified, and the manufacturing cost of the inner cable can be reduced. In addition, unification of materials can contribute to productivity improvement.

The perspective view which shows the structure of the inner cable 100. FIG. FIG. 3 is a cross-sectional view showing the structure of the inner cable 100. Schematic which shows a mode that the mesh body 2 expands-contracts in the bending part of the inner cable 100. FIG. Schematic which shows a mode that the crack and peeling of the resin layer 3 do not arise in the bending part of the inner cable 100. FIG.

  First, the inner cable 100 which concerns on 1st embodiment of this invention is demonstrated using FIG.1 and FIG.2.

  FIG. 1 is a perspective view showing the structure of the inner cable 100. FIG. 2 is a cross-sectional view showing the structure of the inner cable 100. Note that an arrow A shown in FIG. 1 indicates the direction of a load applied to the inner cable 100 when used as a control cable.

  The inner cable 100 is a string-like medium that transmits an operation amount given to one end thereof to the other end. The inner cable 100 mainly includes a core 1, a mesh body 2, and a resin layer 3.

  The core 1 is constituted by a fiber bundle of one or more aramid fibers. In the present embodiment, the core 1 is composed of one core strand 11 formed by twisting a plurality of aramid fibers and six side strands 12 formed by twisting a plurality of aramid fibers. That is, in this embodiment, it is 1 bundle + 6 bundles.

  The core strand 11 is a fiber bundle arranged along the longitudinal direction (the direction of arrow A) of the inner cable 100. Moreover, the side strand 12 is a fiber bundle twisted around the outer periphery of the core strand 11 without a gap. In this way, the core 1 is composed of the core strand 11 disposed in the center and the side strand 12 twisted around the outer periphery thereof.

  In the embodiment of the present invention, the core 1 is constituted by a fiber bundle of so-called para-type aramid fibers (Technola (registered trademark), source: Teijin Techno Products Co., Ltd.). A fiber may be sufficient and it is not limited to this.

  The mesh body 2 is formed by braiding a plurality of thin lines of synthetic resin. In the present embodiment, the mesh body 2 is formed by braiding polyester (polyethylene terephthalate) resin fine wires.

  After the mesh body 2 is formed in a tubular shape, the core 1 is inserted into the inner peripheral portion. Alternatively, the mesh body 2 is formed by braiding on the outer periphery of the core 1. In this way, the mesh body 2 covers the outer periphery of the core 1.

  In the embodiment of the present invention, the mesh body 2 is formed by braiding a fine line of a polyester resin (Tetron (registered trademark)), but may be a phenol resin or the like, and is limited to this. is not.

  The resin layer 3 is formed by solidifying a thermoplastic resin. In the present embodiment, the resin layer 3 is formed by solidifying a nylon (polyamide) resin.

  The resin layer 3 is formed by a so-called tubing method or dipping, in which the core 1 and the mesh body 2 are fed out and the resin is extruded and solidified to the outer peripheral portion of the mesh body 2. In this way, the resin layer 3 covers the outer periphery of the mesh body 2.

  In the embodiment of the present invention, the resin layer 3 is formed by extruding and solidifying a nylon resin (PA12). However, the resin layer 3 may be a polycarbonate resin or the like, and is not limited thereto.

  In the inner cable 100 having the above structure, the reason why the bending radius of the inner cable 100 can be reduced and the reason why the resin layer 3 can be prevented from being cracked or peeled off will be described.

  First, the reason why the bending radius of the inner cable 100 can be reduced will be described with reference to FIG.

  FIG. 3 is a schematic diagram showing how the mesh body 2 expands and contracts at the bent portion of the inner cable 100. Note that an arrow B shown in FIG. 3 indicates the extending direction of the mesh body 2 in the bent portion of the inner cable 100. Further, an arrow C shown in FIG. 3 indicates the shrinking direction of the mesh body 2 at the bent portion of the inner cable 100.

  From FIG. 3, it can be seen that, in the bent portion of the inner cable 100, the mesh body 2 extends on the outer peripheral side of the bent portion and contracts on the inner peripheral side of the bent portion. More specifically, in the bent portion of the inner cable 100, the mesh body 2 expands when the mesh on the outer peripheral side of the bent portion widens, and contracts by narrowing the mesh on the inner peripheral side of the bent portion.

  Thereby, in the inner cable 100 according to the first embodiment of the present invention, since the mesh body 2 expands and contracts according to the bending of the inner cable 100, the flexibility of the inner cable 100 is improved and the bending radius is reduced. It becomes possible.

  Next, the reason why the resin layer 3 constituting the inner cable 100 can be prevented from being cracked or peeled will be described with reference to FIG.

  FIG. 4 is a schematic view showing a state where the resin layer 3 is not cracked or peeled off at the bent portion of the inner cable 100. In addition, the arrow D shown in FIG. 4 has shown the extension direction of the resin layer 3 in the bending part of the inner cable 100. FIG. Further, an arrow E shown in FIG. 4 indicates the shrinking direction of the resin layer 3 in the bent portion of the inner cable 100.

  As can be seen from FIG. 4, in the bent portion of the inner cable 100, the resin layer 3 extends on the outer peripheral side of the bent portion and contracts on the inner peripheral side of the bent portion. More specifically, in the bent portion of the inner cable 100, the resin layer 3 extends with the mesh body 2 on the outer peripheral side of the bent portion, and contracts with the mesh body 2 on the inner peripheral side of the bent portion.

  Thereby, in the inner cable 100 according to the first embodiment of the present invention, since the mesh body 2 expands and contracts according to the bending of the inner cable 100, the difference in elongation between the mesh body 2 and the resin layer 3 is small. Thus, it becomes possible to prevent cracking and peeling of the coating layer 3.

  Furthermore, since the inner cable 100 according to the present embodiment is formed by using the polyester body that is a typical synthetic resin for the mesh body 2, the manufacturing cost of the inner cable 100 can be reduced. Moreover, since it can reduce in weight compared with the metal mesh body 2 and does not have electrical conductivity, it can contribute to safety improvements such as prevention of influence on electronic equipment due to formation of electric and magnetic fields and prevention of leakage.

  Below, the inner cable 200 which concerns on 2nd embodiment of this invention is demonstrated.

  The inner cable 200 according to the present embodiment has substantially the same structure as the inner cable 100 according to the first embodiment. However, it is different in that the mesh body 2 is formed using a fluororesin.

  Thereby, in the inner cable 200 according to the present embodiment, since the mesh body 2 is formed using a fluororesin, the slipperiness between the mesh body 2 and the core 1 made of aramid fibers is improved, and the inner cable It is possible to further reduce the bending radius of 200. The fluororesin is not particularly limited as long as the above object of the mesh body can be achieved. For example, Toyoflon (registered trademark) fiber (PTFE fiber, available from Toray Industries, Inc.) is preferably used. Can be used.

  Below, the inner cable 300 which concerns on 3rd embodiment of this invention is demonstrated.

  The inner cable 300 according to the present embodiment has substantially the same structure as the inner cable 100 according to the first embodiment and the inner cable 200 according to the second embodiment. However, it differs in that the mesh body 2 is formed using a fiber bundle of aramid fibers.

  Thereby, since the inner cable 300 which concerns on this embodiment forms the mesh body 2 using the fiber bundle of an aramid fiber, the raw material of a component can be unified and the manufacturing cost of this inner cable 300 is reduced. It becomes possible. In addition, unification of materials can contribute to productivity improvement.

  In addition, since inner cable 100 * 200 * 300 which concerns on embodiment of this invention mentioned above covers the outer periphery of the core 1 with the mesh body 2, a cross section can be maintained circularly (refer FIG. 2). Thereby, even if it is a bending part of the inner cable 100 * 200 * 300, for example, since it does not deform | transform, it becomes possible to transmit the operation amount smoothly.

  Moreover, since the inner cable 100/200/300 covers the core 1 with the mesh body 2, it is not necessary to perform a process for preventing the fiber bundle of the aramid fibers constituting the core 1 from being unwound, thereby improving productivity. It becomes.

  Furthermore, since the mesh of the mesh body 2 bites into and catches the fiber bundle of aramid fibers constituting the core 1, it is possible to prevent the mesh body 2 and the resin layer 3 from coming off (displaced) from the core 1.

  Further, since the mesh of the mesh body 2 bites into and gets caught in the resin layer 3, even if the mesh body 2 is formed of aramid fibers having strong chemical resistance, the resin layer 3 comes off (displaces) from the mesh body 2. Can be prevented.

  The inner cables 100, 200, and 300 as described above may be used as an opener for a vehicle fuel lid or a control cable for a parking brake. When used as an opener control cable, the outer diameter of the inner cable 100/200/300 is about 2.0 mm, and the outer diameter of the core 1 is about 1.2 mm to 1.5 mm. When used as a control cable for a parking brake, the outer diameter of the inner cable 100/200/300 is about 3.6 mm, and the outer diameter of the core 1 is about 3.0 mm. The cable end can be formed by a known method, for example, by crimping an end member on the resin layer 3.

1 core 2 mesh body 3 resin layer 11 core strand 12 side strand 100 inner cable 200 inner cable 300 inner cable

Claims (4)

With an aramid fiber bundle as the core,
Cover the outer periphery of the core with a tubular mesh body,
An inner cable, wherein the outer periphery of the mesh body is covered with a thermoplastic resin.   The inner cable according to claim 1, wherein the mesh body is made of a synthetic resin.   The inner cable according to claim 2, wherein the synthetic resin is a fluororesin.   The inner cable according to claim 1, wherein the mesh body is made of an aramid fiber.

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