JPH0492110A - Control cable - Google Patents

Abstract

PURPOSE:To enhance durability and feeling with high efficiency by coating the external periphery of an inner rope with a polyphenylene sulfide resin in thickness in which a lay remains, and making a liner between a conduit and the inner rope of a polytetrafluoroethylene resin. CONSTITUTION:A control cable 1 is composed of an inner rope 2, a conduit tube 7 in which the inner rope 2 is inserted in its freely slidable state, and a liner between the conduit 7 and the inner rope 2. A paint coating 3 of polyphenylene sulfide resin is formed on the external periphery of the inner rope 2 in thickness in which a lay remains, and the linear 4 is formed a polytetrafluoroethylene resin. As to the inner coating method, there is no special limit as long as such a paint coating in which a lay remains as an electrostatic powder paint and a solvent paint, or the like is applied. As to the polyphenylene sulfide, it can be used alone, but it is recommendable that an organic filler or an inorganic filler is added in a small quality in order to improve sliding capability and abrasion proof capability, and as to the material of the linear, it can be used alone, but it is recommendable that a small quantity of the organic filler or the inorganic filler is added.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control cable. More specifically, the present invention relates to a control cable that has significantly improved durability, load efficiency, and feel.

[Conventional technology] Conventionally, in order to improve durability, load efficiency, and feel, a plastic coating (hereinafter referred to as "inner coat") was applied to the outer circumference of the inner cable of a control cable, and a plastic tube (hereinafter referred to as "inner coat") was applied inside the conduit. , this tube is called a liner) is used as a control cable.

For example, in Japanese Patent Publication No. 63-67042, the inner coat is made of polytetrafluoroethylene (hereinafter referred to as PTFE), and the liner is made of polyoxymethylene (hereinafter referred to as PTFE).
A control cable made of ROM (hereinafter referred to as ROM) and a control cable whose inner coat is made of nylon 11 and whose liner is made of polybutylene terephthalate (hereinafter referred to as PBT) are shown. All of these have been shown to have good durability because the coefficient of friction between the inner coat and the plastic liner is small, resulting in good load efficiency and little wear.

In addition, Utility Model Application No. 60-62620 shows a control cable with an inner coat made of polytrifluoroethylene and a liner made of PBT, which has good load efficiency, reduces hitting noise, and improves the feel. has been shown to improve.

Further, JP-A-50-109337 discloses a method for forming an inner coat by electrostatically depositing powder of an olefin resin or the like (eg, Teflon) having good slipperiness and then heat-welding it.

This method has been shown to provide a thin, uniform coating and leave twists, which helps retain lubricant and improves durability.

[Problem to be solved by the invention] The control cable is an automobile accelerator cable,
It is used in many applications such as clutch cables, manual transmission control cables, and automatic transmission control cables, and is desired to have higher efficiency and improved durability.

Furthermore, recently there has been a strong desire to improve the operating feel of control cables.

However, conventional liner coat type (combination of liner and inner coat) control cables that aim to improve efficiency and durability lack a sense of rigidity because the thick synthetic resins slide in contact with each other. There was a problem with the operation feeling due to the wet feel.

In view of the above circumstances, it is an object of the present invention to provide a control cable that is highly efficient, has good durability, and has a good feel.

[Means for Solving the Problems] A control cable of the present invention includes an inner cable, a conduit through which the inner cable is slidably inserted, and a liner provided between the conduit and the inner cable. In the cable, a paint coating of polyphenylene sulfide resin is formed on the outer periphery of the inner cable to a thickness that leaves twists, and the liner is formed of polytetrafluoroethylene resin.

The inner coating method is not limited to any method, such as electrostatic powder coating or solvent coating, as long as the coating is applied so that the twist remains. In the case of extrusion molding, it is difficult to apply a thin and uniform coating, resulting in a thick wall, which causes problems such as the inner cable becoming inflexible and cracking depending on the cable arrangement.

Polyphenylene sulfide (hereinafter referred to as PPS), which is the material of the inner coat, may be PPS alone, but in order to improve sliding properties and abrasion resistance, organic filler (PPS) may be used.
TFE, melanin cyanerate, etc.), inorganic fillers (
Graphite, talc, molybdenum disulfide, etc.) may be added in small amounts.

Further, the PTFE that is the material of the liner may be PTFE alone, but a small amount of organic filler (pps powder, polyamideimide powder, etc.) or inorganic filler (graphite, talc, molybdenum disulfide, etc.) may be added.

[Function] The control cable of the present invention has better load efficiency and a better operational feeling than conventional control cables.

Such performance was achieved by combining specific materials for the inner coat and liner and by specifying the structure of the inner coat. In other words, PPS on the inner coat
Paint coating is applied using resin to leave the twists.
By using PTFE-based resin for the liner, we have achieved high performance load efficiency, durability, and operational filling far beyond any conventional control cable.

It goes without saying that thick coatings such as conventional PTFE and nylon 11 give a poor operational feel.

In addition, those coated with a thin, uniform powder coating of PTFE provide a good operating feel, but the inner coating wears out quickly, resulting in a decrease in load efficiency.

Furthermore, when PBT is used for the liner and PPS coated so that the twist remains is used for the inner coat, the load efficiency after durability is reduced.

On the other hand, the combination of the present invention in which a PPS resin is used for the inner coat and a PTFE resin is used for the liner has unprecedented high performance load efficiency, durability, and a good operational feeling.

[Example] Next, the present invention will be explained in detail.

Fig. 1 is a partially cutaway perspective view of an embodiment of the control cable of the present invention, Fig. 2 is a schematic illustration of a measuring device for measuring load efficiency, and Fig. 3 is the measurement results of durability and load efficiency. FIG. 4 is a cross-sectional view of one embodiment of the inner cable related to the control cable of the present invention.

Referring to FIG. 1, the structure of the control cable of the present invention will be explained.

The control cable (1) of the present invention may have a structure as shown in FIG. 1, but the present invention is not limited to such a structure.

(2) is inner cable, (3) is inner coat, (4) is liner, (5) is shield, (6) is outer coat, (7
) is a conduit.

The inner cable (2) is a wire lobe made by twisting seven strands of seven 0.35 mm steel cable wires around the outer circumference of an oil-tempered wire with an outer diameter of 1.6 mm, and the outer diameter is 3.
, 5 m, m.

The conduit (7) is a liner (4) with an outer diameter of 5.7 mm and an inner diameter of 3.7 mm, and 24 steel cables with an outer diameter of 0.8 mm are twisted around the outer periphery of the liner (4), and the outer periphery is made of polypropylene coated with a thickness of 0.9 mm. It is composed of a resin outer coat (6).

Example 1 In the above structure, the inner coat (3) and the liner (
4) is the material shown in Table 1, and the inner coat (3) is the material shown in Table 1.
) was coated with a solvent and then baked at a temperature of 370° C. for 30 minutes, with an outer diameter of 3.55 mm and a cross-sectional structure as shown in FIG. 4.

In addition, there is a clearance of 0.1.5 mm in diameter between the outer circumference of the inner coat (3) and the liner (4), and a silicone grease lubricant (8) is applied to the outer circumference of the inner coat (3). A control capsule was prepared in which the coating was applied at a rate of 0, sg/m.

Comparative Example] A control cable was produced in the same manner as in Example 1, except that the inner coat (3) and liner (4) were made of the materials shown in Table 1.

Comparative Example 2 The inner coat (3) and liner (4) were made of the materials shown in Table 1, and the inner coat (3) was coated with a solvent and then baked at a temperature of 380°C for 40 minutes, and had an outer diameter of 3. 55
mm, and has a cross-sectional structure as shown in FIG. A control cable similar to that of Example 1 was manufactured in other respects.

Comparative Example 3 A control cable was produced in the same manner as in Comparative Example 2, except that the inner coat (3) and liner (4) were made of the materials shown in Table 1.

Comparative Example 4 A control cable was prepared in the same manner as in Example 1, except that the inner coat (3) and liner (4) were made of the materials shown in Table 1.

The materials of the inner coat (3) and liner (4) of Example 1 and Comparative Examples 1 to 4 are shown in Table 1.
E: Polytetrafluoroethylene PBT: Polybutylene terephthalate A load efficiency test and a durability test were conducted on the above Examples and Comparative Examples.

The test apparatus will be explained based on FIG. Constant temperature box (11
) The control cable of the test specimen was bent into a semicircle so that the bending radius of the inner cable (2) was 150 mm and the bending angle was 180 degrees (conduit length + 700 mm, both inner cables: 1
I installed 00100O. A lever (12) is attached to the input side end of the inner cable (2), and a spring (13) for applying a load is attached to the load side end. In addition, a load cell (1
4), a load cell (15) is attached midway on the load side. The lever (12) was swung as shown by the arrow (A) and reciprocated at a rate of 30 times per minute, with each reciprocation being one reciprocation. Spring (13) has a stroke of 21mm and is 7
A load of 0 kgf was applied. The temperature inside the thermostatic box (11) was maintained at 130°C.

Load efficiency is W/FX1 when load side output is 10kgf
It is represented by 00. Note that F) is the input side load cell (
14) measurement value, (W) is the load cell (15) on the load side
This is the measured value. The durability was set at 1 million times.

Figure 3 shows the measurement results of load efficiency and durability.

As is clear from the figure, in Comparative Examples 2 and 3, the load efficiency decreases early. This is the PTFE of the inner coat (3)
This is because they wear out early. Also, in Comparative Example 1, the load efficiency decreases at around 500,000 durability cycles. Furthermore, in Comparative Example 4, the initial load efficiency was poor because there was no inner coat (3).
Load efficiency decreases at around 700,000 cycles.

In contrast, in Example 1 of the present invention, no decrease in load efficiency was observed even after 1 million durability cycles, maintaining a high load efficiency of 88 to 90%, and providing a good operational feeling.

As long as the control cable of the present invention satisfies the conditions specified in the claims, it can exhibit high efficiency, good durability, and performance with a good feeling. If a lubricant such as graphite or PTFE is added to 4), it is impossible to say that the load efficiency will be further improved.6 [Effects of the Invention] The control cable of the present invention has higher efficiency and durability than conventional ones. It has good quality and a good feel.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of an embodiment of the control cable of the present invention, Fig. 2 is a schematic illustration of a measuring device for measuring load efficiency, and Fig. 3 is the measurement results of durability and load efficiency. FIG. 4 is a cross-sectional view of one embodiment of the inner cable related to the control cable of the present invention. (Main symbols in the drawing) (1): Control cable (2>: Inner cable (3): Inner coat (4): Liner (5) Co-shield (6). Arata coat (7> Conduit)

Claims (1)

[Claims] 1. A control cable consisting of an inner cable, a conduit through which the inner cable is slidably inserted, and a liner provided between the conduit and the inner cable, where twists remain on the outer periphery of the inner cable. A control cable characterized in that a paint coating of a polyphenylene sulfide resin is formed in a thickness, and the liner is made of a polytetrafluoroethylene resin.