JP2908574B2 - Control cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control cable. More specifically, the present invention relates to a control cable which has excellent load efficiency and can smoothly perform an inner cable sliding operation for a long period of time.

[0002]

2. Description of the Related Art A control cable basically comprises a flexible conduit and a single flexible inner cable slidably inserted into the conduit. Remote control of a driven device attached to the other end of the inner cable by adding a push-pull operation, a rotation operation or an operation combining them, for example, a transmission, a brake, a clutch of a car, a motorcycle, a bicycle, etc. It is used to operate speedometers.

[0003] As the inner cable, a cable obtained by twisting a plurality of metal wires or a cable reinforced by applying a synthetic resin coat to the outer periphery thereof or winding a flat steel wire around the wire is used. The conduit is, for example, a spiral tube in which one or a plurality of flat steel wires or round steel wires are densely wound in a coil shape, and a protective layer made of a synthetic resin provided outside the spiral tube. Is used.

However, the sliding resistance increases when the conduit and the inner cable are in direct contact with each other. For example, as disclosed in Japanese Patent Application Laid-Open No. 60-231009, a flexible tube made of synthetic resin is provided around the inner periphery of the conduit. The synthetic resin such as polyethylene, polyoxymethylene, polybutylene terephthalate, and polytetrafluoroethylene is used as the material of the liner.

Further, a synthetic resin coating (hereinafter referred to as an inner coat) is provided on the outer periphery of the inner cable, and Teflon, 11-nylon, or the like is used as a material of the inner coat.

However, a control cable provided with a liner or an inner coat as described above includes:
In order to further reduce the sliding resistance between the liner and the inner cable, consider the effect on the control cable's load efficiency {(load / operating load) x 100}, for example, the synthesis of silicone oil, olefin oil, etc. Intermediate oil and mineral oils and greases based on these oils, as well as lubricants such as oils and greases containing antioxidants, rust inhibitors, extreme pressure agents, etc. between the inner cable and the conduit Was necessary.

However, in a control cable using a lubricant, unevenness in the application of the lubricant causes variations in the load efficiency between products, and when the lubricant is applied, dirt and dust are applied to the lubricant. There are a number of problems, such as difficulty in performing the coating operation because the adhesive easily adheres and may cause sagging.

In addition, the durability of the control cable largely depends on the lubricant. For example, if the lubricant breaks due to long-term use, the liner is completely worn and the operability of the control cable is reduced. Is extremely reduced.

[0009]

SUMMARY OF THE INVENTION Accordingly, the present inventors
In view of the prior art, a lubricant that requires a complicated application process is unnecessary, and furthermore, as a result of intensive research to provide a control cable in which the sliding operation of the inner cable is smooth for a long time, a specific When a resin containing an organopolysiloxane was used for the liner, it was found that a control cable in which the sliding operation of the inner cable was smooth for a long period of time was obtained.

[0010] The present inventors have further conducted intensive studies, in the case of using a specific thermoplastic resin to the liner and the inner coat, a sliding operation of the inner cable is more one layer smoothly over time I found out.

The present invention has been completed based on such findings.

[0012]

Means for Solving the Problems That is, the present invention is a conduit having a flexible liner provided on the inner surface, search among the inner coating is provided is a by slidably inserted through the control cable Te, wherein the liner organopolysiloxane consists 13 to 20 wt% dispersion containing thermoplastic resin, and said organo port polysiloxane is a kinematic viscosity at 25 ° C. is 1,000,000 to 50,000,000 cSt ultra high viscosity Oruganopori The present invention relates to a control cable comprising 45 to 85% by weight of a siloxane and 55 to 15% by weight of a low viscosity organopolysiloxane having a kinematic viscosity at 25 ° C of 25 to 10,000 cSt, wherein the inner coat comprises a thermoplastic resin.

[0013]

Operation and Examples To improve the load efficiency of the control cable without applying a lubricant, an organopolysiloxane is contained in the resin constituting the liner and the inner coat, and the organopolysiloxane is coated on the surface of the resin. You only have to bleed out. Here, in order to facilitate bleed-out of the organopolysiloxane, the organopolysiloxane preferably has a low viscosity. However, when a material having too low viscosity is contained in a large amount, there is a problem that slippage occurs in the extruder at the time of forming the liner, so that the material cannot be fed and therefore cannot be formed. On the other hand, a high-viscosity organopolysiloxane can be added in a large amount to the resin, and can be molded without slipping in an extruder. However, an organopolysiloxane having too high a viscosity has little bleed-out on the surface of the resin, so that the load efficiency and durability of the control cable cannot be improved.

Therefore, in the present invention, an ultra-high-viscosity organopolysiloxane and a medium-low-viscosity organopolysiloxane are used in order to have good extrusion stability during liner molding and to bleed out on the surface of the resin.

As described above, the control cable of the present invention is such that the inner cable provided with the inner coat is slidably inserted into a flexible conduit having a liner on the inner surface. An ultra-high viscosity organopolysiloxane having a kinematic viscosity at 25 ° C of 1,000,000 to 50,000,000 cSt is used for the liner. It is composed of 55 to 15% by weight of a low viscosity organopolysiloxane having a kinematic viscosity of 25 to 10,000 cSt at 25.degree. C. and 85.degree. C., and a thermoplastic resin is used for the inner coat.

In the present invention, the thermoplastic resin constituting the liner contains an ultrahigh-viscosity organopolysiloxane and a medium-low-viscosity organopolysiloxane dispersed therein, so that a lubricant is interposed between the conduit and the inner cable. Not to mention that there is no need to perform this, and an excellent effect of smooth sliding between the conduit and the inner cable for a long period of time is exhibited.

Examples of the thermoplastic resin used for the liner include polybutylene terephthalate, polyoxymethylene, and polyamides represented by 11-nylon and 6,6-nylon. The present invention relates to such thermoplastic resins. The present invention is not limited to the above example, and other thermoplastic resins can be used as long as the object of the present invention is achieved. In addition, among the thermoplastic resins, polybutylene terephthalate having a melt index of 0.1 to 5 g / 10 minutes has a small change in load efficiency when used for a long time, and thus can be particularly preferably used. is there. When the melt index of the polybutylene terephthalate is less than 0.1 g / 10 min, it becomes difficult to extrude the liner, and when it exceeds 5 g / 10 min, the toughness of the liner is insufficient. In the assembly process, the liner tends to be easily peeled off, and the performance required for the liner such as durability and abrasion resistance tends to be hardly exhibited.

Specific examples of the polybutylene terephthalate include a homopolymer of butylene terephthalate and a copolymer of butylene terephthalate and another monomer component such as ethylene terephthalate, wherein the content of the other monomer component is about And 10% by weight or less. In the present invention, the polybutylene terephthalate may contain a polymer such as a polyester or a polyetherester, for example, as long as the object of the present invention is not hindered.

Here, the “melt index” as used herein refers to a value measured according to the method A specified in ASTM D1238.

The conditions for measuring the melt index of the polybutylene terephthalate are as follows: temperature 250 ° C., load 0.
It is 325kgf.

The ultrahigh-viscosity organopolysiloxane used for the liner has a kinematic viscosity at 25 ° C. of 1,000,000 to 50,000.
It must be one million cSt. When the kinematic viscosity at 25 ° C. is less than 1,000,000 cSt, the holding power in the thermoplastic resin is reduced. Handling becomes difficult and lubricity is poor. The kinematic viscosity of the ultrahigh-viscosity organopolysiloxane at 25 ° C.
It is particularly preferred that it is between 2 and 10 million cSt.

The ultrahigh-viscosity organopolysiloxanes include linear organopolysiloxanes and branched organopolysiloxanes. Representative examples thereof include dimethylpolysiloxane, methylalkylpolysiloxane, methylphenylpolysiloxane, methylphenylpolysiloxane and methylphenylpolysiloxane. Aminoalkylpolysiloxane, methylfluoroalkylpolysiloxane and the like can be mentioned. Among these, dimethylpolysiloxane is particularly preferred in terms of lubricity, heat resistance, cost, and the like between the thermoplastic resin of the liner and the thermoplastic resin of the inner coat.

The low viscosity organopolysiloxane used in the liner has a kinematic viscosity of 25 to 25 ° C.
The one of 10,000 cSt is used. If the kinematic viscosity is less than 25 cSt, the medium-low viscosity organopolysiloxane will evaporate in a short period of time, causing wear to the liner while using the obtained control cable, and 10,000 cSt. If the ratio exceeds the above range, the organopolysiloxane does not sufficiently bleed from the thermoplastic resin, and the load efficiency decreases, which is not preferable. The kinematic viscosity at 25 ° C. of the organopolysiloxane having a low viscosity is preferably 45 to 5500 cSt, more preferably 50 to 5000 cSt.

Examples of the medium-to-low viscosity organopolysiloxane include linear organopolysiloxane and branched organopolysiloxane. Representative examples thereof include dimethylpolysiloxane, methylalkylpolysiloxane, methylphenylpolysiloxane, and methylphenylpolysiloxane. Aminoalkylpolysiloxane, methylfluoroalkylpolysiloxane and the like can be mentioned. Among them, dimethylpolysiloxane is particularly preferable in terms of lubricity, heat resistance, cost, and the like between the thermoplastic resin of the liner and the thermoplastic resin of the inner coat.

The blending amount of the ultra-high viscosity organopolysiloxane and the medium-low viscosity organopolysiloxane contained in the thermoplastic resin constituting the liner is such that the high-viscosity organopolysiloxane of the organopolysiloxane is 45 to 85% by weight. The content of the organopolysiloxane is adjusted so as to be 55 to 15% by weight. When the compounding amount of the ultra-high viscosity organopolysiloxane is less than 45% by weight and when the compounding amount of
In any case where the weight ratio exceeds 100%, when forming the liner, the screw and the resin slip in the extruder, making it impossible to feed, making molding impossible. When the amount of the siloxane exceeds 85% by weight and when the amount of the medium and low viscosity organopolysiloxane is less than 15% by weight, the case where only the ultra-high viscosity organopolysiloxane is used is used. This is not preferable because there is not much difference in the effect and the improvement of the load efficiency is hardly observed. Incidentally, the compounding amount of the ultra-high viscosity organopolysiloxane is 50
It is particularly preferable that the content of the organopolysiloxane is 50 to 20% by weight.

The organopolysiloxane comprising the ultrahigh-viscosity organopolysiloxane and the medium-low-viscosity organopolysiloxane is dispersed and contained in the thermoplastic resin in an amount of 13 to 20% by weight. When the content of the organopolysiloxane is less than 13% by weight, the load efficiency decreases during use over a long period of time, and when the content exceeds 20% by weight, When the liner is formed, the screw and the resin slide in the extruder, so that they cannot be fed and cannot be formed, which is not preferable. The content of the organopolysiloxane is preferably 15 to 18% by weight.

The above-mentioned organopolysiloxane includes:
If necessary, for example, an antioxidant, a rust inhibitor, an extreme pressure agent and the like may be added. Further, the organopolysiloxane may be greased.

The method for incorporating the organopolysiloxane into the thermoplastic resin is not particularly limited.
For example, a method of separately adding an ultra-high-viscosity organopolysiloxane and a medium-low-viscosity organopolysiloxane while heating and melting and kneading a thermoplastic resin and uniformly dispersing the same, or a method of previously preparing an ultra-high-viscosity organopolysiloxane And an organopolysiloxane obtained by mixing the organopolysiloxane with a low-viscosity organopolysiloxane within the above-mentioned range, and then adding the resulting mixture to a thermoplastic resin melted by heating to uniformly disperse the mixture.

In the present invention, a thermoplastic resin is used for the inner coat provided on the surface of the inner cable. Examples of such a thermoplastic resin include polybutylene terephthalate, high-density polyethylene, polyoxymethylene, a fluororesin represented by polytetrafluoroethylene, a polyamide represented by 6,6-nylon, and polyphenylene sulfide. The present invention is not limited to only such examples.

The polybutylene terephthalate is characterized by excellent heat resistance, oil resistance and wear resistance, a low coefficient of friction, and a small change in the initial load efficiency and the load efficiency after long-time sliding. Have Incidentally, the melt index of the polybutylene terephthalate,
The smaller the value, the better the durability such as abrasion resistance and stress cracking resistance, but it tends to be difficult to extrude, so it is preferably 0.1 g / 10 min or more, and if too large, When toughness is insufficient and bending is repeated, cracks may occur in the inner coat, and the liner may break when rapidly bent in the control cable assembly process and assembly process. Preferably, there is.

[0031] Examples of the polybutylene terephthalate, as same as those used for the liner over are exemplified.

The high-density polyethylene has a density of 0.95 g / cm
Are those having ³ or more and has excellent physical properties such as coefficient of friction low temperature region is small, a large load efficiency. If the high-density polyethylene has a melt index of less than 0.01 g / 10 minutes, it tends to be difficult to extrude it, and it will not be possible to adhere to a stranded steel wire. If the time exceeds / 10 minutes, oil resistance, stress cracking resistance and abrasion resistance tend to decrease.
Minutes. The melt index is a value measured at a temperature of 190 ° C. and a load of 2.16 kgf.

The polyoxymethylene has excellent abrasion resistance, a low coefficient of friction, a small stick-slip under a high load, and a property of improving the operational feeling of the control cable. In addition, when the melt index of the polyoxymethylene is less than 0.5 g / 10 minutes, the melt viscosity becomes large, and it is necessary to heat the material to a temperature close to the thermal decomposition temperature at the time of extrusion molding. When it exceeds 5 g / 10 minutes, the bending fatigue resistance, impact strength and abrasion resistance tend to be inferior. Therefore, the amount is preferably 0.5 to 5 g / 10 minutes. The melt index is a value measured at a temperature of 190 ° C. and a load of 2.16 kgf. Representative examples of the polyoxymethylene include, for example, Delrin manufactured by Dupont, Cercon manufactured by Hoechst Celanese, and Duracon manufactured by Polyplastics Co., Ltd.

The fluororesin exhibits excellent sliding characteristics within a temperature range of -40 to 200.degree. Specific examples of the fluororesin include, for example, polytetrafluoroethylene, ethylene tetrafluoride-perfluoroalkyl vinyl ether copolymer, ethylene tetrafluoride-propylene hexafluoride copolymer, ethylene-tetrafluoroethylene copolymer , Polyvinylidene fluoride, polychlorotrifluoroethylene and the like. Among these, polytetrafluoroethylene, ethylene tetrafluoride-perfluoroalkylvinyl ether copolymer and ethylene tetrafluoride-hexafluoroethylene copolymer, and especially polytetrafluoroethylene, are heat-resistant, load-efficient and flexible. Since it has excellent properties, it can be suitably used.

The polytetrafluoroethylene has a high melting point (327 ° C.) and a very high melt viscosity.
Cannot be extruded. Therefore, in order to form an inner coat, a paste obtained by adding and kneading kerosene to polytetrafluoroethylene powder is extruded into a tube under high pressure by a so-called paste extrusion method.
After coating the steel twisted wire while, for example, dried in a heating oven such as an electric furnace, it is preferable to calcination.

The above-mentioned ethylene tetrafluoride-perfluoroalkylvinyl ether copolymer and ethylene tetrafluoride-
The propylene hexafluoride copolymer can be extruded by heating and melting. The ethylene tetrafluoride-perfluoroalkyl vinyl ether copolymer is ASTM D33
07, there are Type I and Type II. Type II has a higher degree of polymerization than Type I and is more resistant to stress cracking, and has a melt viscosity 6 to 7 times greater than Type I, making it difficult to flow. However, it can be extruded, so it is particularly durable. Suitable for applications that require performance. Representative examples of type II include, for example, Teflon (registered trademark) PFA340-J (manufactured by DuPont-Mitsui Fluorochemicals Co., Ltd.).

The ethylene tetrafluoride-propylene hexafluoride copolymer is specified in ASTM D2116 and has a type I
~ Type IV. These have different degrees of polymerization, and Type I and Type II, which have small degrees of polymerization, have poor stress cracking resistance.
It is preferred to use IV. Representative examples of Type III include, for example, Teflon FEP160 (manufactured by DuPont-Mitsui Fluorochemicals Co., Ltd.).

Typical examples of the polyamide include 6,6-nylon, 6-nylon, 11-nylon, 12-nylon and the like.

The polyphenylene sulfide is roughly classified into two types, a crosslinked type prepolymer and a linear type prepolymer. In the present invention, any type can be used. Since polyphenylene sulfide alone generally has poor stretchability and flexibility, it is preferable to use a polyphenylene sulfide adjusted to contain 5 to 40% by weight of an elastomer. The elastomer has a flexural modulus of 30,000 kg / cm of polyphenylene sulfide softened by melt-kneading.
² or less (ASTM D790), tensile elongation at break is 5% or more (AS
TM D638) is preferred. Representative examples of such elastomers include, for example, epoxy group-containing olefin copolymers (ethylene content 88% by weight, glycidyl methacrylate content 12% by weight), hydrogenated styrene-butadiene-styrene copolymer modified product (Asahi Kasei Kogyo) (Tuff Tech M1913 manufactured by Mitsui Petrochemical Industry Co., Ltd.). Examples of a method for forming an inner coat using the polyphenylene sulfide include a melt extrusion method and an electrostatic powder coating method. As polyphenylene sulfide which can be used for powder electrostatic coating method,
Any of a linear type and a cross-linked type may be used.
If a thin coating film of 0.1 mm or less is formed, it is not always necessary to add an elastomer. The particle size of the powder needs to be 5 to 150 μm. If the particle size of the powder is less than 5 μm, it tends to aggregate and form pinholes.
If it exceeds μm, a uniform thin coating film will not be formed. In order to improve the adhesion between the steel wire and polyphenylene sulfide, it is preferable to apply an appropriate primer to the steel wire in advance.

Among the thermoplastic resins used for the inner coat, polybutylene terephthalate, high-density polyethylene, polyoxymethylene and polyphenylene sulfide are particularly preferred because they have excellent abrasion resistance. Among them, polyoxymethylene can be suitably used in the present invention because stick-slip hardly occurs.

Further, the inner coat may be made of a thermoplastic resin in which the organopolysiloxane is dispersed and contained as in the case of the liner.

Next, the control cable of the present invention will be described with reference to the drawings.

FIG. 1 is a partially cutaway perspective view showing an embodiment of a pulling control cable used for operating a clutch or a brake of an automobile.

1 is an inner cable, 2 is a conduit, 3 is an inner coat, and 4 is a liner. The inner cable 1 twists seven steel wires to form one strand, and the strand is
This is a 7 × 7 wire rope made by main twisting and has an outer diameter of 3.0 mm. The conduit 2 is formed by winding a steel strip having a square cross section (thickness: 1.30 mm, width: 2.40 mm) on the liner 4 spirally and closely, and is tubular (outer diameter: 8.60 mm, inner diameter: 6.00 mm)
And a protective layer 6 of a synthetic resin such as polypropylene, for example, which is coated on the outer periphery with a thickness of 0.7 mm. The inner coat 3 is about 0.35 m thick
m covering the outer circumference of the inner cable 1 and its outer diameter is 3.7mm
It is. Liner 4 has a conduit 2 with an inner diameter of 4.6 mm and an outer diameter of 5.6 mm
Is formed on the inner surface.

There is a gap of 0.9 mm in diameter between the outer periphery of the inner coat 3 and the inner periphery of the liner 4.

The number of strands constituting the inner cable 1 and the number of steel wires constituting the strands are not particularly limited, and various conventionally known combinations can be adopted.

The conduit 2 may have a shield layer in which a plurality of metal wires or synthetic resin wires are wound around the liner 4 with a gentle spiral in place of the armor layer 5. Further, for the protective layer 6, for example, polypropylene,
Various conventionally known materials such as polyvinyl chloride are used.

The present invention can be applied to any control cable as long as the inner coat 3 is formed on the outer peripheral surface of the inner cable 1 and the liner 4 is formed over almost the entire inner peripheral surface of the conduit 2. It is not limited by the configuration of the inner cable 1 and the conduit 2.

As described above, since the control cable of the present invention does not require a lubricant, there is no problem in the workability of applying the lubricant and no variation in load efficiency between products due to uneven coating of the lubricant. is there. Further, since the control cable of the present invention is provided with a liner containing a specific organopolysiloxane, the load efficiency over a long period is excellent.

Next, the control cable of the present invention will be described in more detail based on embodiments, but the present invention is not limited to only such embodiments.

Examples 1 to 26 and Comparative Examples 1 to 20 Dimethylpolysiloxane having a kinematic viscosity of 3,000,000 cSt at 25 ° C. was used as an ultrahigh-viscosity organopolysiloxane. Dimethylpolysiloxane having kinematic viscosity was mixed to prepare an organopolysiloxane having the composition shown in Tables 1 to 4.

Next, the thermoplastic resins shown in Tables 1 to 4 were melted by heating, and the organopolysiloxane obtained above was added so as to have the content shown in Tables 1 to 4 to obtain a uniform composition. The resulting mixture was kneaded to form a liner having an inner diameter of 4.6 mm and an outer diameter of 5.6 mm.

Next, the liner was inserted into a conduit provided with a 0.7 mm thick protective layer of polypropylene on the outer periphery of a spring-like armor layer having an outer diameter of 8.6 mm.

The outer surface of the inner cable (outer diameter: 3 mm) was coated with an inner coat made of a thermoplastic resin shown in Tables 1 to 4 so that the outer diameter became 3.7 mm.

In Examples 12 to 15 and Comparative Examples 12 to 14, 18 parts by weight of kerosene was added to 100 parts by weight of polytetrafluoroethylene powder (average particle diameter: 25 μm) by a paste extrusion method and kneaded. The resulting paste was coated on a steel wire while being extruded into a tube at high pressure, heated in an electric furnace, dried at 200 ° C, and then fired at 385 ° C to form an inner coat. Further, in Example 22, primer FP-001 manufactured by Chuko Kasei Kogyo Co., Ltd. was applied to a steel wire, and polyphenylene sulfide powder was sprayed with an electrostatic coating gun, and then heated to 350 ° C. to form a coating film. did.

Next, a control cable was prepared by passing an inner cable through the conduit.

The load efficiency was measured according to the following method as physical properties of the obtained control cable.
Tables 1 to 4 show the measurement results.

(Load Efficiency) The test apparatus will be described with reference to FIG. A control cable of the specimen ( inner cable length : 1000 mm, conduit length : semicircular curved so that the bending radius of the inner cable 1 is 150 mm and the bending angle is 180 degrees in the thermostat box 11) 700mm). A lever 12 is attached to the input end of the inner cable 1, and a spring 13 for applying a load is attached to the load end. A load cell 14 is mounted on the input side of the inner cable 1 and another load cell 15 is mounted on the load side.

The load efficiency was measured as follows while controlling the inside of the thermostatic chamber 11 at a predetermined temperature (room temperature (23 ° C.) or 130 ° C.).

The lever 12 is swung as shown by the arrow A,
One reciprocation was performed once, and reciprocation was performed at a speed of 60 times per minute. The spring stroke is 0 to 30mm and a load of 50kgf is applied.

The load efficiency was calculated by the formula: (W / F) × 100 (%) when the load side output was 50 kgf. Where F
Is a measured value of the input side load cell, and W is a measured value of the load side load cell.

The initial load efficiency and the load efficiency after reciprocating 1 million times were examined.

[0063]

[Table 1]

[0064]

[Table 2]

[0065]

[Table 3]

[0066]

[Table 4]

In Tables 1 to 4, * 1 to * 13 mean the following.

* 1: Polybutylene terephthalate (PBT1401 × 04 manufactured by Toray Industries, Inc.) * 2: The liner and the inner coat were completely worn out after 50,000 times. * 3: 6,6-nylon (Leona 1702 manufactured by Asahi Kasei Corporation) * 4: Polyoxymethylene (Polyplastics Co., Ltd.)
Duracon M25-34) * 5: An inner coat thermoplastic resin with 3 million cS
t (25 ° C) ultra-high viscosity dimethyl polysiloxane 70% by weight
And polybutylene terephthalate containing 15% by weight of an organopolysiloxane consisting of 30% by weight of dimethylpolysiloxane at 500 cSt (25 ° C.). * 6: After 500,000 cycles, both the liner and the inner coat were completely worn. * 7: Polytetrafluoroethylene (Nitto Denko Corporation)
* 8: Both the liner and the inner coat were completely worn out after 300,000 cycles. * 9: Ethylene tetrafluoride-perfluoroalkyl vinyl ether copolymer (Mitsui DuPont Fluorochemical Co., Ltd.)
* 10: Ethylene tetrafluoride-propylene hexafluoride copolymer (Teflon FEP 16 manufactured by DuPont-Mitsui Fluorochemicals Co., Ltd.)
0) * 11: Polyphenylene sulfide (linear polyphenylene sulfide having a melt viscosity of 2500P at a temperature of 320 ° C and a shear rate of 10sec- ¹ ) treated with an aqueous acetic acid solution of pH 4 heated to 90 ° C and an ethylene-glycidyl methacrylate copolymer (Ethylene content: 88% by weight) blended at a weight ratio of 80:20. * 12: Polyphenylene sulfide (polyphenylene sulfide and polytetrafluoroethylene blended at a weight ratio of 90:10, powder having an average particle diameter of 25 μm) Paint body, 35
Baking was performed at 0 ° C. to form an inner coat. * 13: High-density polyethylene (Showa Denko Co., Ltd., Showrex 6002B) As is clear from the results shown in Tables 1 to 4, the control cable of the present invention obtained in each example was used for a liner. If the type of thermoplastic resin obtained is the same, it is understood that the initial load efficiency and the load efficiency after reciprocating 1 million times are superior to those obtained in Comparative Examples 1 to 20. .

Further, it can be seen that the one obtained in Comparative Example 4 in which organopolysiloxane is dispersed and contained only in the thermoplastic resin of the inner coat has low durability. further,
The product obtained in Example 5 in which the organopolysiloxane was dispersed and contained in both the liner and the inner coat thermoplastic resin was dispersed and contained only in the thermoplastic resin of the liner as in the other examples. It can be seen that the performance is almost unchanged.

The thermoplastic resin used for the inner coat is polybutylene terephthalate having a melt index of 0.1 to 5 g / 10 minutes, and a melt index of 0.01 to 5 g / 10 minutes.
It can be seen that the initial load efficiency can be improved if the material is polyoxymethylene, polyphenylene sulfide, or a high-density polyethylene or a fluorine resin having a melt index of 0.01 to 5 g / 10 minutes.

[0071]

The control cable of the present invention does not require a lubricant unlike the conventional control cable, so that there is no problem in the operation of applying the lubricant such as sagging, and the unevenness in the application of the lubricant is eliminated. The performance does not vary.

The control cable of the present invention
Initial load efficiency and load efficiency after repeated use
Is superior to the conventional one, so that the sliding operation of the inner cable can be performed smoothly for a long period of time.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing one embodiment of a control cable of the present invention.

FIG. 2 is an explanatory diagram of a measuring device for measuring the performance of the control cable of the present invention.

[Explanation of symbols]

 1 inner cable 2 conduit 3 inner coat 4 liner

Continuation of the front page (51) Int.Cl. ⁶ identification code FI C10N 30:02 40:32 50:10 (56) References JP-A-60-231100 (JP, A) JP-A-59-121215 (JP, A) JP-A-1-158209 (JP, A) JP-A-2-93113 (JP, A) JP-A-2-242889 (JP, A) JP-A-57-40711 (JP, U) JP-A-3 -57518 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16C 1/00-1/28 C08L 83/04-83/08

Claims (8)

(57) [Claims] To 1. A conduit having a flexible liner provided on the inner surface, a control cable cord is inserted slidably within the inner coating is provided, wherein the liner organopolysiloxane The organopolysiloxane has a kinematic viscosity of 1,000,000 to 50,000,000 cSt at 25 ° C.
45 to 85% by weight of an ultra-high viscosity organopolysiloxane and 55 to 15% by weight of a medium to low viscosity organopolysiloxane having a kinematic viscosity at 25 ° C. of 25 to 10,000 cSt, and the inner coat is made of a thermoplastic resin. Characteristic control cable. 2. The control cable according to claim 1, wherein the ultrahigh-viscosity organopolysiloxane and the medium-low-viscosity organopolysiloxane are dimethylpolysiloxane. 3. The control cable according to claim 1, wherein the thermoplastic resin used for the liner is polybutylene terephthalate having a melt index of 0.1 to 5 g / 10 minutes. 4. The control cable according to claim 1, wherein the thermoplastic resin used for the inner coat is polybutylene terephthalate having a melt index of 0.1 to 5 g / 10 minutes. 5. The control cable according to claim 1, wherein the thermoplastic resin used for the inner coat is polyoxymethylene having a melt index of 0.5 to 5 g / 10 minutes. 6. The control cable according to claim 1, wherein the thermoplastic resin used for the inner coat is polyphenylene sulfide. 7. The control cable according to claim 1, wherein the thermoplastic resin used for the inner coat is a high-density polyethylene having a melt index of 0.01 to 5 g / 10 minutes. 8. The control cable according to claim 1, wherein the thermoplastic resin used for the inner coat is a fluororesin.