KR101235013B1 - Non-lubricated cables - Google Patents

Abstract

An unlubricated cable is disclosed.
The non-lubricated cable disclosed is a cable having a wire and a tubular liner disposed to surround the outside of the wire,
The liner includes an inner diameter of regular hexagon,
The liner consists of a composition comprising a fluoroaromatic plastic, wherein the composition is composed of graphite, carbon powder, carbon nanotube, glass fiber, carbon fiber, polyimide and polypropylene sulfide based on 100% by weight of the composition. 1 to 10% by weight of any one or more fillers selected from the above, when the filler is a polyimide polyimide 1 to 5% by weight relative to 100% by weight of the composition, the filler is polypropylene sulfide Polypropylene sulfide is 1 to 10% by weight based on 100% by weight of the composition,
The fluoroaromatic plastic further comprises one or more selected from the group consisting of polytetrafluoroethylene, perfluoroalkoxyalkane, ethylenetetrafluoroethylene, polychlorotrifluoroethylene, and purple ethylene propylene. It features.

Description

Non-lubricated cables

The present invention relates to an unlubricated cable.

In particular, it is mainly applied to automobiles, and relates to the non-lubricated cable excellent in the low friction characteristic.

A cable is a power transmission means for operating a gear transmission, a clutch, a parking brake, a hood, a trunk door, a fuel tank door, and the like of an automobile.

1 is a block diagram of a conventional cable.

As shown in FIG. 1, the conventional cable C includes a wire 1 made of metal, a tubular liner 2 around which the wire 1 is slidably movable, and the liner 2. It includes a coil-shaped reinforcing member (3) wound around the and the tubular outer member (4) surrounding the reinforcing member (3).

This conventional cable (C) is negative about the advantage that the liner (2) is made of soft or hard synthetic resin to reduce friction when the wire (1) slides against the liner (2) to enable smooth sliding motion Although it is difficult to do so, the liner 2 and the wire 1 are formed in a circular shape, so that the contact area is large and the friction area is increased proportionally, causing the wear of the liner 2 to be accelerated, thereby shortening the life of the liner. Due to the large frictional resistance, the kinetic force of the wire 1 is lowered, which causes noise.

To improve this, lubrication cables have been disclosed. Lubrication cable is to reduce the coefficient of friction between the wire and the liner by injecting a lubricant (usually grease) between the wire (1) and the liner (2), but the wire (1) in one direction occurs during use When the bias is generated in one direction based on the cross section, the viscosity of the lubricant is increased by lowering the temperature, so that the lubrication characteristics are significantly reduced.

In addition, in order to apply a lubricant between the wire 1 and the liner 2, an application interval is required, in which case the load is concentrated on one side of the liner as the number of times of use increases, causing uneven wear.

2 and 3 show another example of a conventional cable, which is disclosed in Korean Patent Laid-Open Publication No. 2005-116971.

As shown in Figs. 2 and 3, other examples of the conventional cable C have the same configuration as the cables described above. However, the liner 2 has a double structure of the inner liner 2a and the outer liner 2b, wherein the inner liner 2a is made of a soft synthetic resin having a low coefficient of friction, and the outer liner 2b is made of hard synthetic resin. There is a difference in configuration.

This improved cable (C) attenuates the frictional force generated when the wire (1) slides to the inner liner (2a) with a small coefficient of friction, and the bending force and external pressure applied from the outside are excellent in shape retention ability. By allowing the outer liner 2b to bear, the frictional force can be significantly reduced.

However, the above-mentioned improved cable C, even though the thickness of the inner liner 2a is thinner than the outer liner 2b, in spite of the effort to reduce the cost, the cost increase compared to the conventional cable by configuring the liner in two layers Is inevitable.

[Previous Document] Korean Patent Publication No. 2005-116971

The present invention provides a non-lubricated cable excellent in low friction characteristics by minimizing the contact area between the inner diameter of the liner and the outer diameter of the wire by improving the inner diameter of the liner to a regular polygon while solving the conventional problems as described above. Is in.

The present invention also provides an unlubricated cable having a liner with improved wear resistance.

In the present invention for achieving the above object, in the cable having a wire and a tubular liner disposed to surround the outside of the wire,
The liner includes an inner diameter of regular hexagon,

The liner consists of a composition comprising a fluoroaromatic plastic, wherein the composition is composed of graphite, carbon powder, carbon nanotube, glass fiber, carbon fiber, polyimide and polypropylene sulfide based on 100% by weight of the composition. 1 to 10% by weight of any one or more fillers selected from the above, when the filler is a polyimide polyimide 1 to 5% by weight relative to 100% by weight of the composition, the filler is polypropylene sulfide Polypropylene sulfide is 1 to 10% by weight based on 100% by weight of the composition,

The fluoroaromatic plastic further comprises one or more selected from the group consisting of polytetrafluoroethylene, perfluoroalkoxyalkane, ethylenetetrafluoroethylene, polychlorotrifluoroethylene, and purple ethylene propylene. It is a non-lubricated cable characterized by.

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The present invention by the above problem solving means, by improving the structure of the liner, it is possible to improve the low friction characteristics without using a lubricant by reducing the contact area of the wire and the liner surrounding it.

Accordingly, it prevents rapid wear of the liner and contributes to extending the life of the liner, it is possible to improve the movement force and power transmission ability of the wire, it is possible to suppress the generation of noise.

1 is an exemplary diagram of a conventional cable.
2 is another exemplary diagram of a conventional cable.
3 is a cross-sectional view taken along the line II of FIG. 2.
4 is a cross-sectional view of an unlubricated cable according to the present invention.
5a to 5d are various embodiments of a liner in an unlubricated cable according to the present invention.
6 is a flowchart illustrating a method of manufacturing a liner in the non-lubricated cable according to the present invention.

Hereinafter, a non-lubricated cable according to embodiments of the present invention is disclosed.

The disclosed embodiments are provided so that those skilled in the art can easily understand the spirit of the present invention, and the present invention is not limited thereto. Embodiments of the invention may be modified in other forms within the spirit and scope of the invention. As used herein, the term " and / or " is used to include at least one of the preceding and following elements. "On" other elements herein means that other elements are directly located on one element and that the third element is further located on the one element . Although each element or portion of the specification is referred to by using the expressions of the first and second expressions, it is not limited thereto. The thicknesses and relative thicknesses of the components shown in the figures may be exaggerated to clearly illustrate the embodiments of the present invention. In addition, the matters described in the attached drawings may be different from those actually implemented by the schematic drawings to easily describe the embodiments of the present invention.

4 is a cross-sectional view of an unlubricated cable according to the present invention.

As shown in FIG. 4, the non-lubricated cable C of the present invention is improved in low friction even without lubricant, and its configuration includes a wire 10, a liner 20, and an outer 40. In addition, it may further include a reinforcing coil wound between the liner 20 and the outer 40.

Here, the outer diameter D of the wire 10 is circular, and the inner diameter d of the liner 20 in contact with the outer diameter D of the wire 10 forms a regular polygon.

Conventionally, since the outer diameter of the wire and the inner diameter of the liner are circular (see FIG. 3), the surface contact is made, and thus the contact area is large, and thus the frictional resistance is large. As described above, the outer diameter D of the wire 10 is Since the inner diameter d of the liner 20 is a regular polygon and is in linear contact, the contact area is reduced, thereby significantly reducing the frictional resistance.

5A-5D are liner form diagrams of various embodiments in an unlubricated cable according to the present invention.

5A to 5D, the inner diameter d of the liner 20 may have a regular polygonal shape such as an equilateral triangle, a square, an pentagon, and a regular hexagon (shown in FIG. 4), each corner angle θ being an obtuse angle ( It is preferable to set it as the regular polygon more than the regular pentagon which is 90 degrees <(theta)), More preferably, you may set it as a regular hexagon.

In the case of an equilateral triangle or a square, the thickness variation in the corner portion and the side portion of the inner diameter d of the liner 20 is severe, and when the reinforcing member 30 is wound around the liner 20, the liner 20 is wound by the winding pressure. ) Is likely to change shape and is not actively recommended.

On the other hand, the non-lubricated cable (C) of the present invention is composed of a composition containing a fluoromer plastic in constituting the material of the liner 20.

The fluoromeroplastic is preferably polytetrafluoroethylene (PTEE), perfluoroalkoxyalkane (PFA), ethylenetetrafluoroethylene (ETFE), polychlorotrifluoroethylene (PCTFE), perfluoro Ethylene propylene (FEP) may be used alone or in combination, and more preferably, polytetrafluoroethylene (PTFE), which has a low coefficient of friction, has excellent abrasion resistance and heat resistance, and is commonly used under the trade name "Teflon". Can be used alone.

In this case, the average particle diameter of the fluoromeroplastic which can be used is usually sufficient as long as it is the particle size of the fluoromeroplastic used for automotive cable liners, but it is preferable that the average particle diameter is 300 to 600 µm.

In addition, the liner 20 of the present invention 1 to 10 weight of any one or more fillers selected from the group consisting of polyimide (PI) and polypropylene sulfide (PPS) with respect to 100% by weight of the composition to improve wear resistance May contain%.

For example, if the fluoromeroplastic is 95% by weight, 5% by weight of polyimide (PI) and / or polypropylene sulfide (PPS) may be included if no other filler is included in the composition.

In addition, when other known fillers are included, 95% by weight of fluoromeroplastics, 3% by weight of polyimide and / or polypropylenesulfide and 2% by weight of the other fillers may be comprised.

In the above, when the filler is polyimide (PI), it may be 1 to 5% by weight of polyimide with respect to 100% by weight of the total composition, it is possible to maximize the effect of wear resistance within the above range (see Table 1). At this time, the average particle diameter of the polyimide (PI) that can be used may be 5 ~ 20㎛.

Alternatively, when the filler is polypropylene sulfide (PPS), the polypropylene sulfide may be 1 to 10 wt% with respect to 100 wt% of the total composition, and may maximize the effect of wear resistance within the range (Table 1). Reference). At this time, the average particle diameter of the polypropylene sulfide that can be used may be 10 ~ 50㎛.

The liner 20 composition of the present invention is a polyvinylidene fluoride-trichlorofluoroethylene copolymer for further maximizing wear resistance in addition to polyimide (PI) and / or polypropylene sulfide (PPS) based on 100% by weight of the composition. It may comprise 2 to 3% by weight.

In this case, it is advantageous to use the above-described polyvinylidene fluoride-trichlorofluoroethylene copolymer of the present invention as compared to adding polyvinyl fluoride series alone or other types of polyvinyl fluoride copolymers ( See Table 1). In this case, the average molecular weight of the copolymer used may be 20,000 to 50,000, the polymerization ratio of polyvinylidene fluoride and trichlorofluoroethylene may be 5: 1 to 1: 5, the average particle diameter may be 1 to 30㎛ have.

The liner 20 composition of the present invention may further include 0.5 to 1.5% by weight of polyetheretherketone with respect to 100% by weight of the composition, thereby further improving the effect of wear resistance (Table 1 Reference). At this time, the average particle diameter of the polyther ketone used may be 1 ~ 30㎛.

The liner 20 composition of the present invention may further include a pigment for expressing a desired color.

The composition of the liner 20 of the present invention may be extended to the life of the liner by significantly improving wear resistance, including fluoromeroplastic as a main component and including specific additives, and may be used even at a high temperature of more than 200 ° C, and The dimensional stability is superior to the conventional liner made only of thermoplastic.

On the other hand, the liner 20 of the non-lubricated cable according to the present invention may be manufactured by a conventional liner manufacturing method using the composition described above, alternatively, may be manufactured by the following method.

In one step, the liner composition according to the present invention is mixed with a lubricant (S10).

Lubricants can be used without limitation, lubricants that can be used conventionally, preferably a lubricant under the trade names Naphtha, ISOPAR, VM & P.

The viscosity of the lubricant used may have a viscosity of 0.5 CP (centipoises) to 5 CP. In this case, the mixture may be prepared while rotating at 10 to 100 rpm for 10 minutes to 1 hour.

In step 2, the mixed composition is aged (S20).

Typically, the aging step may be performed for 12 to 24 hours at 25 ~ 35 ℃ but is not limited thereto.

Here, the step (sieving step: S100) may further comprise the step of screening the composition particles having a particle size of 500㎛ or less between the step 1 and step 2.

In step 3, a liner having a desired specification is manufactured through an extrusion process (S30).

The liner composition is introduced using an extruder to extrude the cylindrical liner to the proper diameter and the appropriate length, and then cut into the required length. At this time, the pre-molding operation (S200) may be performed in the step before the extrusion process.

Example 1

To the liner composition satisfying the weight ratio of Table 1 below was mixed with a lubricant (trade name Napththa, 35% by weight of the composition) and stirred at 25 rpm.

Thereafter, the sieving operation was carried out with a 10 mesh sieve on the stirred mixture and aged at 30 ° C. for 16 hours in an oven.

Then, preforming is performed through a preforming machine at a molding speed of 20 mm / min and a molding pressure of 20 kgf / cm ² .

Thereafter, an extruder was added to the extruder to finally produce a cable liner having an outer diameter of 3.6 mm and an inner diameter of 2.8 mm.

[Example 2 to Comparative Example 4]

The same procedure as in Example 1 was conducted except that the cable liner composition satisfying the weight ratio of Table 1 was used.

[Experimental Example]

The cable liners (outer diameter: φ 2.8 mm, inner diameter: φ 3.6 mm, length: 50 mm) of Examples 1 to 15 and Comparative Examples 1 to 4 were placed in a friction wear tester (ORIENTEC, EFM-III-F) and Friction and Wear. Tester was tested for 2 hours at a speed of 50mm / min with a load of 15kgf to measure the amount of wear, and the average value was repeated 5 times and shown in Table 1. The relative material here is steel.

a
(weight%) b
(weight%) c
(weight%) d
(weight%) e
(weight%) f
(weight%) g
(weight%) h
(weight%) Wear
(g) Comparative Example 1 100 0.0190 Example 1 99 One 0.0105 Example 2 98 2 0.0011 Example 3 97 3 0.0010 Example 4 96 4 0.0010 Example 5 95 5 0.0009 Example 6 99 One 0.0170 Example 7 98 2 0.0165 Example 8 97 3 0.0069 Example 9 96 4 0.0023 Example 10 95 5 0.0009 Example 11 93 7 0.0008 Example 12 90 10 0.0008 Example 13 92 3 5 0.0008 Example 14 92.5 5 2.5 0.0003 Example 15 91.5 5 2.5 One 0.0001 Comparative Example 2 92.5 5 2.5 0.0008 Comparative Example 3 92.5 5 2.5 0.0007 Comparative Example 4 91.5 5 2.5 One 0.0004

In Table 1, a: PTFE, b: PI, c: PPS, d: polyvinylidene fluoride-tlychlorofluoroethylene copolymer (Solvay, Mw: 330,000), e: polyvinylidene fluoride (Solvay, Mw: 261,000), f: polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP, Solvay, Mw: 396,000), g: polyiserketone, h: polyisimide.

As can be seen from Table 1, the wear amount of Examples 1 to 12 to which the additive of the present invention was added was significantly reduced compared to Comparative Example 1 composed of PTEF alone. In addition, when polyimide was used as the additive, at least 2% by weight was used, and when polypropylene sulfide was used, at least 5% by weight was added to greatly reduce the amount of wear.

On the other hand, Example 14, in which a polyvinylidene fluoride-trichlorofluoroethylene copolymer was added to the additive of the present invention, was compared with Comparative Examples 2 and 3 in which a similar kind of polyvinylidene fluoride-based compound or copolymer was added. It was more effective in reducing the amount of wear. Furthermore, it can be seen that Example 15, in which polyiserketone was added as a participant, was more effective in reducing wear compared to Comparative Example 4, in which a similar kind of polyisimide was added.

10: wire 20: liner
30: reinforcing member 40: outer

Claims (8)

A cable having a wire and a tubular liner disposed to surround the outside of the wire,
The liner includes an inner diameter of regular hexagon,

The liner consists of a composition comprising a fluoroaromatic plastic, wherein the composition is composed of graphite, carbon powder, carbon nanotube, glass fiber, carbon fiber, polyimide and polypropylene sulfide based on 100% by weight of the composition. 1 to 10% by weight of any one or more fillers selected from the above, when the filler is a polyimide polyimide 1 to 5% by weight relative to 100% by weight of the composition, the filler is polypropylene sulfide Polypropylene sulfide is 1 to 10% by weight based on 100% by weight of the composition,

The fluoroaromatic plastic further comprises one or more selected from the group consisting of polytetrafluoroethylene, perfluoroalkoxyalkane, ethylenetetrafluoroethylene, polychlorotrifluoroethylene, and purple ethylene propylene. Features non-lubricated cable. delete delete delete delete delete delete delete

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