JPH05149320A - Multiple layered tube for cable conduit - Google Patents

Abstract

PURPOSE:To provide a multiple layered tube for a cable conduit, having 5 low frictional characteristic and excellent in durability, where vibration can be prevented from being dispersed outside if the tube is used in remotely transmitting operating force, for example, in throttle operation of an automobile. CONSTITUTION:A multiple layered tube for a cable conduit comprises a sliding layer 2 and a damping layer 3 covering the layer 2, where the sliding layer 2 is made of a plastic resin and the damping layer 3 is made of a rubber material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layer tube for cable conduits, and its purpose is to provide a damping property which affects the improvement of the operation feeling when it is used during the remote transmission of the operation force such as the throttle operation of a car. Is to provide a cable conduit tube that is extremely good, and has low friction and excellent durability.

[0002]

2. Description of the Related Art A cable conduit used for throttle operation of an automobile generally has a structure in which a wire is loosely inserted inside a low friction tube, and the inner wire slides inside the tube by remote control. Operate. In many cases, the outer circumference of such a cable conduit is protected by a protective material, or the tube itself is formed of a low-friction material in order to improve durability.

As a material for such a low-friction tube, a fluororesin, particularly polytetrafluoroethylene, is said to be preferable in view of characteristics such as slipperiness and heat resistance. However, this tube made of polytetrafluoroethylene has a problem that it cannot be used for general purpose because the cost is too high. Instead, general-purpose plastics such as polyethylene and engineering plastics such as polyacetal are generally used. Has been done.

[0004]

However, a cable conduit for an automobile is usually bent and used, and a wire inserted in the cable conduit is in contact with an outer tube to transmit stress. For this reason, vibrations and abnormal sounds associated with the movement of the wire may be radiated to the outside through the tube, and this phenomenon is particularly noticeable in highly rigid materials such as the general-purpose plastics and engineering plastics described above, which may cause the vehicle to drive. The person may feel discomfort.

[0005]

According to the present invention, there is provided a sliding layer and a damping layer covered with the sliding layer, the sliding layer is made of a plastic resin, and the damping layer is made of rubber. By providing a multi-layer tube for a cable conduit, which is characterized in that it is formed of a strip-shaped material, the above-mentioned conventional problems are alleviated.

[0006]

[Function] The sliding layer is made of a plastic resin having a small coefficient of friction, and the damping layer covering the sliding layer has a characteristic of instantaneously converting the vibration into heat energy and absorbing it, and also has a loss elasticity. Since it is made of a rubber-like material having a coefficient higher than that of the sliding layer, low friction, durability and vibration damping properties are good.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a multi-layer tube for a conduit according to the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of a multi-layer tube (1) for a cable conduit according to the present invention, in which (2) is a sliding layer and (3) is a damping layer. The sliding layer (2) is formed of a crystalline plastic which is said to have a small friction coefficient, and this crystalline plastic includes fluorine such as polytetrafluoroethylene and tetrafluoroethylene-perfluoroalkyl vinyl ether co-composite (PFA). Resin, polybutylene terephthalate, polyacetal, ultra high molecular weight polyethylene (UHMW
PE) etc. can be illustrated as a suitable example.

The damping layer (3) may be any rubber-like material that has the characteristic of instantaneously converting vibration into heat energy and absorbing it, and has a loss elastic coefficient higher than that of the sliding layer (2). A thermoplastic resin is preferably used in terms of processing, and a polyester resin or a styrene-isoprene-styrene resin having a large molecular weight is particularly preferable, but the thermoplastic resin is not particularly limited.

As a method of coating the outer surface of the sliding layer (2) with the damping layer (3), a rubber-like damping layer (3) is formed on the surface of the sliding layer (2) extruded in a tubular shape in advance. It is manufactured by selecting an optimal processing method depending on the coating material, such as melt extrusion.

FIG. 2 is a sectional view showing another embodiment of the multi-layer tube (1) for a cable conduit according to the present invention. It suffices if a single damping layer (3) is provided, and the damping layer (3)
A protective layer (4) may be further provided on the outer periphery of the. The protective layer (4) is not particularly limited, and well-known materials generally used such as polyamide (nylon 6), polyethylene, polyvinyl chloride are preferably used.

[0011]

As described in detail above, the present invention comprises a sliding layer and a damping layer coated on the sliding layer, the sliding layer is made of a plastic resin, and the damping layer is Since it is a multi-layer tube for cable conduit that is made of a rubber-like material, it has low friction characteristics and excellent vibration damping, so the driver feels vibration and discomfort when operating the throttle of the vehicle. It has the effect of becoming a multi-layer tube for a cable conduit which is excellent in durability without being caused.

[0012]

The effects of the multi-layer tube for a cable conduit according to the present invention will be further clarified by the following examples.

Example 1 Polybutylene terephthalate (manufactured by Toray Industries, Inc .: trade name PBT # 1401) was extruded at 250 ° C. to obtain a tubular product having inner and outer diameters of 4 mm and 5 mm, respectively. Next, polyester elastomer (Toyobo Co., Ltd.)
Manufactured: Perprene P150M (trade name) was coated on the surface of the tubular material at 220 ° C. to a thickness of 0.5 mm to obtain a multi-layer tube for a conduit.

Example 2 Polyacetal (manufactured by Polyplastics Co., Ltd .: trade name DURACON YF-10) was extruded at 220 ° C. to obtain a tubular product having inner and outer diameters of 4 mm and 5 mm, respectively. Next, a styrene-isoprene-styrene copolymer (Kuraray Co., Ltd .: trade name V-SIS) was coated on the surface of the tubular material at a temperature of about 180 ° C to a thickness of 0.5 mm to obtain a multi-layer tube for cable conduit. .

Comparative Example 1 Polybutylene terephthalate used in Example 1 (manufactured by Toray Industries, Inc .: trade name PBT # 14)
In (01), tube-shaped products having inner and outer diameters of 4 mm and 6 mm were obtained.

(Comparative Example 2) Polyacetal used in Example 2 (manufactured by Polyplastics Co., Ltd .: trade name DURACON)
YF-10) was used to obtain tube-shaped materials having inner and outer diameters of 4 mm and 6 mm, respectively.

The tubes of Examples 1 and 2 and Comparative Examples 1 and 2 are shown in Table 1.

[Table 1]

(Test Example) Examples 1-2 and Comparative Examples 1-2
The tube was evaluated for vibration absorption. As an evaluation method, as shown in FIG. 3, a tube (T) is wound around the semicircular part of the disk (S), a displacement gauge is fixed at point A, and a load of 5 Kgf is raised and lowered via a wire. The amplitude of the tube (T) due to the sliding of the wire and the amplitude is 1/2 from the stop.
The time until decay to each was compared. The results are shown in Table 2.

[Table 2]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a multi-layer tube for a cable conduit according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the same.

FIG. 3 is a schematic diagram showing a test method of a multi-layer tube for a cord conduit according to the present invention.

[Explanation of symbols]

 1 Multi-layer tube for cable conduit 2 Sliding layer 3 Damping layer

Claims (2)

[Claims] 1. A sliding layer and a damping layer covered by the sliding layer, wherein the sliding layer is made of a plastic resin, and the damping layer is made of a rubber-like material. A multi-layer tube for cable conduit characterized by. 2. The multi-layer tube for a cable conduit according to claim 1, wherein an outer surface of the damping layer is covered with a protective material.