JPS5825004A - Control cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control cable used for remote transmission of operating force in automobiles, etc. The present invention relates to a control cable that has a resin layer that has excellent heat resistance, sliding properties, and abrasion resistance. There is something that provides.

Generally 1. The control cable (see Figures 1 to 8)
This is a basic configuration in which a cable 2 made of a large number of twisted steel wires is inserted into a flexible tubular casing 1, and operating force is transmitted remotely by pulling the cable 2. The main part of the casing 1 is a tubular casing body 8 made of closely wound steel wire, and a resin coating 4 is provided around the outer periphery of the casing body 8 for protection.

On the other hand, the basic performance of the control cable is that the cable 2 must have good sliding properties during the above operations, and high durability corresponding to the frequency of operation, so the outer periphery of the cable 2 must be coated with a resin. 6 or by inserting a resin pipe 5 into the inner periphery of the casing body 8 to replace the original metal-to-metal sliding with metal-to-resin sliding. has been done.

However, with the recent improvements in automobile technology such as the use of turbo engines, automobile control cables have been designed to function in high-temperature environments and to have excellent sliding properties and durability under conditions of use that include high-temperature environments. These high performances are accompanied by industrial requirements that must be met in acceptable economic conditions. Therefore, the resin layer of the Huntroll cable (resin coating 4, resin tube 5, resin coat 6)
The resin outer layer 8 of the conduit cable, which will be described later, is collectively defined as the resin layer of the 0-wire cable), for example, if the material is simply replaced with conventional polyamide (6N fiber resin, etc.), it will not meet the above requirements. There are problems that cannot be addressed.

The present invention aims to solve the above technical problems, and includes a resin layer produced using a new thermoplastic resin obtained by graft polymerizing polyamide with an anti-thermostatic formulation and an elastomer with an anti-thermostatic formulation. The main point is the control p-lunar pull.

Specifically, cuprous chloride (CIDI) and potassium iodide (KI) are added to polyamide as heat aging inhibitors.

PPM ~ 7QQ PPM (usually 400 PPM ~ 5
00 PPM) and added the olefinic antioxidant DLTDP as a heat aging inhibitor to the modified ethylene copolymer as an elastomer at a rate of 500 PPM to 4.000 PPM.
PM (usually 2.000 PPM) or olefinic antioxidant BHT (Ols HI30) at 500 P
PM ~4.000 PPM (a 1st,000 PP
M) A resin layer is formed using a thermoplastic resin obtained by graft-polymerizing the above-mentioned polyamide with the above-mentioned modified ethylene copolymer and the above-mentioned modified ethylene copolymer. The above-mentioned modified ethylene copolymer is preferably one in which maleic anhydride is graft-polymerized to a copolymer of ethylene and propylene, and the polymerization amount of the above-mentioned polyamide and modified ethylene copolymer depends on the amount used. It is specifically determined depending on the properties of the resin layer, and for example, when the resin coating 4 is targeted, a range of 8 to 75% (wt%) is preferable in consideration of the necessary flexibility. on the other hand,
The above-mentioned olefinic antioxidant is even more effective when both DLTDP and BHT are added to produce a synergistic effect.

The present invention having the above structure is characterized by using a resin having a combination structure in which both polyamide and elastomer are polymerized with an anti-thermostatic formulation, and has a unique effect as a resin layer of a control cable.

The effect will be explained below. First, the results of a heat aging test comparing a product of the present invention using the present invention as the resin liquid 114 shown in FIG. 1 and a conventional product are shown in the table below.

In the above, A: a conventional resin-coated conteseal cable using polyamide (nylon 6).

B: A resin-coated Conte Seal cable using a graft-polymerized resin in which only the polyamide is treated with an anti-thermostatic formulation and the anti-thermostatic formulation of the elastomer is omitted.

C: Resin-coated control cable of the present invention.

As shown in the table above, all conventional products crack at 170°C for 100 hours, so in an actual vehicle, the inside of the casing 1 may rust due to water intrusion at an early stage, causing the controller to lose its function. However, the product of the present invention has “1
It shows remarkable heat resistance with no heat aging at all even at 70°C for 200 hours, and the combination of the above-mentioned anti-thermostatic formulations has a unique effect (in the table above, only polyamide It is clear that more than half of B, which was treated with an anti-thermostatic formulation, cracked at 170°C for 100 hours.

Next, the resin tube 5 or resin coat 6 shown in FIG.
When the present invention is used, the control cable of the resin pipe 5 according to the present invention has the disadvantage that stick-slip and slip phenomena qualitatively appear during the pulling operation of the cable, as shown in Fig. 5). However, there was one resin pipe made from the invention 6.
shows extremely smooth sliding properties as shown in FIG. 5(b).

Note that the symbol P1 in the figure is the load at the beginning of pulling, P! is the load during operation, and the conventional product has a large difference between Pl and Pj (a difference of 2 kg in the experimental example), but the product of the present invention has no such difference and exhibits good sliding properties. There is. This is thought to be due to the initial deformation of the elastic body of the olefinic thermoplastic elastomer, which reduces the sliding resistance and eliminates the conventional stick-slip phenomenon.

On the other hand, as shown in the cross section in FIG. 4, there is a known method in which reinforcing wires 7 made of steel wire are arranged in a spiral shape with large leads around the outer periphery of a resin pipe 5, and the reinforcing wires 7 are covered with an outer resin layer 8 so as to fill the reinforcing wires 7. In the conduit cable (one type of control cable), polyamide is used for the resin outer layer 8'. However, the resin outer layer 8 made of polyamide
Since the adhesion with the reinforcement 11A7 is weak and the resin pipe 6 is highly rigid, the resin pipe 6 separates from the resin outer layer 8, and the cable 2 slides, causing interference between the exposed reinforcing wire 7 and the cable 2, resulting in inoperability. When the casing 1 is wired in a curved manner, the reinforcing wire 7 located on the inside of the curve presses the terminal fitting fixed to the end face due to the above-mentioned protrusion phenomenon, causing the terminal fitting to shift or come off. Furthermore, when a serial number or the like is stamped on the casing 1, there is a risk that cracks will develop from the stamped area, leading to damage to the casing 1.

Therefore, when the present invention is applied to the resin outer layer 8, the above-mentioned defects can be eliminated and a stable control cable function can be maintained. That is, the performance comparison between a conventional product having a resin outer layer made of simple polyamide and an inventive product having a resin outer layer according to the present invention is as shown in the table below.

As described above, in the present invention, the sliding load due to the forced withdrawal of the resin pipe 5 is improved to approximately 9 times, and the total amount of protrusion of the reinforcing wire 7 due to the curved wiring is improved to approximately ζ or less, thereby improving the adhesion and flexibility of the resin outer layer. It has the effect of Furthermore, in another comparison test, the product of the present invention significantly reduced the number of cracks in the outer resin layer in a low-temperature atmosphere, and increased the permissible use area at low temperatures by 20% compared to the conventional product.
The practical effect extending from ℃ to -40℃ has been revealed.

As described above, the present invention has the effect of stably maintaining the control cable function in a wide range of areas including high and low temperatures, and satisfying various performances required in the field such as slidability, flexibility, and adhesion. Moreover, these performance improvements are possible with an improved structure based on the polyamide of the conventional product, and because it does not use expensive fluororesin, it has the advantage of being economically viable as a hot water mass-produced product. .

[Brief explanation of the drawing]

Figures 1 and 2.8: A vertical cross-sectional view showing the structure of the control cable, Figure 4: A cross-sectional view showing the structure of the conduit cable, and Figure 5: A diagram of the sliding characteristics of the control cable.
(a) shows the conventional product, and (to) shows the product of the present invention. Main symbols: l: casing, 2: cable, 4: resin coating, 5: resin tube, 6: resin coat, 7: reinforcement wire, 8: resin outer layer

Claims (1)

[Scope of Claims] (1) A thermoplastic resin obtained by graft polymerizing polyamide and a modified ethylene copolymer, and the polyamide has "
Cuprous chloride (Curl) J and [Potassium iodide (KI)
J is added to IQQ PPM ~ 700 PPM,
Olefin antioxidant D is added to the modified ethylene copolymer.
LTDP or BHT is 500 PPM ~ 4.000P
A control cable with a resin layer made of thermoplastic resin containing PM. (2) The control cable according to claim (1), in which both DLTDP and BHT are added. (8) Anhydrous copolymer of ethylene and propylene! 2. A composition according to claim (1), which uses a modified ethylene copolymer obtained by graft polymerization of leic acid. − cable.