KR200181481Y1 - Wire cable for small mechanical apparatus - Google Patents

Abstract

The present invention relates to a wire cable used as a power transmission means in a small mechanical device.

The present invention has a technical feature that the flexibility of the cable is increased by changing the twisted-wire structure of the wire cable made of a conventional 7 × 7 structure to the structure of 6 × 7 + 1 × W (16).

In other words, by changing the center strand structure from the basic 7 stranded structure of 1 × 7 to the 16-stranded Warrington type structure, the flexibility is improved, so that the wire cable can be bent through a small sheave or drum and reciprocate. It increases fatigue resistance and improves durability.

In addition, the wire cable of the present invention has another feature of the present invention in that the core strand is crimped to reduce the core strand before being stranded with the outer layer strand. In other words, the wire filling rate of the center strands was increased by crimping and reducing, and the line contact structure between the element wires constituting the center strand was changed to the surface contact structure, followed by stranding with the outer layer strands to form the cable.

Therefore, the load applied to the center strand is distributed by the increased contact area between the element wires, so that the frictional force on the unit area between the element wires is reduced, thereby preventing the partial breakage of the element wires due to concentration of friction force, thereby improving the relative wear resistance of the strands. There is an advantage.

Description

Wire cable for small mechanical apparatus

The present invention relates to a small wire cable, and more specifically, a wire that constitutes a central strand in a structure of a wire cable used as a medium for power transmission in a small mechanical device such as an automobile window regulator. By selecting several wire diameters different from similar diameters and stranding them in a Warrington type, performing proper crimping and reducing processing on the stranded center strands, followed by stranding with outer layer strands to produce wire cables. The present invention relates to a wire cable for a compact automatic mechanical device that has improved fatigue resistance due to repeated bending over a conventional product.

In general, wire cables are roughly classified into parallel stranded cables, single stranded cables, and multi- stranded cables, each of which is bundled with a single strand of wire. Among them, a single-stranded strand cable is a type of multi- stranded cable.

Each strand constituting a single-stranded stranded cable is basically composed of strands of approximately the same diameter with a circular cross section, and there are two types of core wires based on one and three wires. Used strands are mainly used, and strands based on three bones are widely used as hemp cores instead of three core wires.

In addition, the number of strands increases by 6 each (the primary outer layer of one core increases by 5) from the inner layer to the outer layer. That is, the number of element wires constituting the strand is 1 + 6 + 12 + 18 + 24 +… in the case of one core wire as the number of layers increases. , 3 + 9 + 15 + 21 + ... Increases as

The number of wires described above is basic by using wires of similar wire diameter, and the actual strands are stranded by a combination of wire diameters of stranded wires. The representative types thereof are Warrington type and filler type. And seal types.

In Fig. 2 (a), the warrington type, (b) the seal type, and (c) the strand structure of the filler type is shown.

As shown in the figure, the Warington type 21 is arranged in the center 21A of the (1 + 6) and inner layer 21B of 6 (21+) and 21C small wires which cross | intersects the element wire of the similar line diameter, and is arrange | positioned. The seal type 22 is twisted as if the inner layer wire 22B which goes through one center element wire 22A is enclosed, and nine thick outer layer wires 22C fill the valley between the inner layer element wires 22B on it. .

Finally, the pillar shape 23 is made of 19 element wires 23A having almost the same diameter except for six thin filler wires 23B. The six filler wires 23B play a role of a spacer filling a gap between the inner layer and the outer layer in order to stabilize the position of the outer layer line circularly.

On the basis of the above description, a wire cable for a conventional automotive window regulator which is currently generally used, as shown in (a) and (b) of FIG. 1, has a size of 8x7 + 1x19 and 7x7. It has two structures. Here, the number before the first is the number of strands, the number after the strand is the number of strands of each strand, the number 1 after the '+' is the number of the strands at the center, and 19 is the number of strands at the center strand.

Of the two structures described above, the former (11) is mainly used in passenger cars, the latter 12 is used in general vehicles such as commercial vehicles, vans.

However, the 7 × 7 structure is composed of strands of similar wire diameters, and the cable of the same structure as the strand, the wear resistance is good, can be useful in places where the wear conditions are severe, and the structure is simple to cause form breakage It has the advantage of being difficult.

However, when the power is transmitted while reciprocating by winding around a small diameter rotor such as a rotating sheave or drum attached to an automobile window regulator, the cable is less flexible, so the cable It is easy to be separated, and due to insufficient flexibility, there is a problem in that the number of disconnections is low because of low fatigue resistance.

The cable 11 of the 8 × 7 + 1 × 19 structure is changed to 7 × 7 by applying the center strand from the 1 × 7 structure to the 1 × 19 structure using an element wire having a smaller wire diameter than the element wire constituting the outer layer strand. Better flexibility and fatigue resistance than cable of construction.

However, the number of wires constituting the central strand is difficult to manufacture, and the cost of the product increases.

Therefore, in order to solve the above problems, by changing the structure of the center strand in contact with all the outer layer strands, the flexibility of the center strand is increased to improve the fatigue resistance, and the lead structure of the center strand is in the contact edge state instead of parallel. It is an object of the present invention to provide a wire cable that can minimize the rise in product cost while extending the life of the product by dispersing the external load applied to the center element and the friction force between the elements.

1 (a) and (b) are cross-sectional views of a wire cable for a conventional vehicle window regulator,

(A) is 8 × 7 + 1 × 19 structure,

(B) is 7 × 7 structure.

2 (a) to 2 (c) are cross-sectional views of a representative 1 × 19 structure.

(A) is Warrington type,

(B) is seal type,

(C) is filler type.

3 (a) and (b) is for a wire cable according to an embodiment of the present invention,

(A) is a perspective view,

(B) is sectional drawing.

((Explanation of symbols for main part of drawing))

21. Warrington strand 22. Sealed strand

23. Filler Strand

The above object of the present invention is to provide the structure of the core strand 12A in the conventional wire cable 12 composed of the center strand of the (1 × 7) structure and the six outer layer strands identical to the center strand. It is achieved by modifying and applying a 16 stranded wire structure in which the relative number of the elemental wires is smaller than that of the basic 19 stranded wire structure by reducing the relative wire diameter of the center wire, which is almost similar to, and compressing and reducing the changed center strands as described above.

Unlike the conventional basic wire structure, the center strand of the wire cable of the present invention has 16 stranded strands or 6 outer strands composed of 7 stranded strands as in the prior art, and the center strand has the number and structure of inner layer wires by selecting as small as possible the diameter of the center strand. To simplify.

Details of the above object and technical configuration of the present invention and the effects thereof according to the present invention will be clearly understood by the following detailed description with reference to the drawings showing preferred embodiments of the present invention.

First, Figure 3 (a) and (b) is a perspective view and a cross-sectional view of a wire cable which is a preferred embodiment of the present invention, the center strand 30 is a five-layer inner wire 32 of the center wire 31 of the smallest wire diameter ) Surrounds the outer circumferential surface, and the wires 33 and 34 of two wire diameters are alternately enclosed around the inner layer wire 32. At this time, the size of each element wire diameter becomes large in order of the center element wire 31, the small outer layer element wire 34, the inner layer element wire 32, and the outer layer element wire 33.

In addition, the element wire 36 constituting the outer layer strands 35 has a diameter of the center element wire 36A somewhat larger than that of the outer layer element wire 36B, and the outer layer element wire 36B forms the outer layer of the center strand 30. It has almost the same wire diameter as the outer layer wire 33.

Another feature other than the improvement of the center strand 30 of the wire cable 38 of the present invention is that the center strand 30 of the cable is compressed to reduce 1 to 5% of the strand structure between the strands in the parallel strand structure. After having the contact lead structure, the cable is stranded with the outer layer strands.

Here, the compression rate of 1 to 5% is less than 1% if the compression rate is less than 1%, the effect of dispersing the load and friction force due to the increase of the contact area between the wires of the center strand is negligible, if it exceeds 5% between the wires The contact area becomes so large that the movement of each other is suppressed, which leads to the inflexibility of the strands.

Mechanical properties of the preferred embodiment of the present invention and the conventional wire cable are as follows.

division Conventional products Product of this invention Wire cable Breaking strength (KN) 2.549 2.946 Fill rate (%) 66.28 71.41 Wire diameter (mm) 1.62 1.7 Middle Simstrand Breaking strength (KN) 0.4799 0.6859 Fill rate (%) 76.28 85.16 Wire diameter (mm) 0.58 0.64 Outer Layer Strand Breaking strength (KN) 0.4210 0.4251 Fill rate (%) 76.11 74.58 Wire diameter (mm) 0.52 0.53

* The tensile load applied to the fracture strength measurement is 2600 N / mm ² .

As can be seen from Table 1, it can be seen that the breaking strength is improved by 15% or more and the filling rate is increased by 10% or more due to the change and reduction of the strand structure.

In addition, the fatigue test result table shows how the improvement in breaking strength and filling rate has a significant effect on the proper fatigue resistance that the wire cable should have in actual repeated operation.

(Unit; times) division Original product This product One 3906 5530 2 4123 5512 3 4130 5460 4 4252 5387 5 4356 5811 6 4448 5822 Average 4203 5585

In the fatigue test conditions, the cable to be tested was reciprocated at a distance of 200 mm at 7 times / min with a load of 70 N. The reciprocating motion was performed using two 30 mm diameter drums and two 19 mm diameter ball bearings. Gave a change in flexion.

As can be seen in Table 2, the fatigue resistance can be seen that the wire cable of the present invention is improved by 30% or more than the conventional cable.

As described above, the wire cable for a small mechanical device of the present invention increases the flexibility of the center strand itself as the wire diameter of the strands forming the center strand decreases and the number thereof increases from 7 to 16, thus providing a compact sheave or drum. Due to the bending reciprocating motion there is an effect that the durability is improved.

In addition, by compressing and reducing the center strand prior to the final twisted wire with a wire cable, the contact area between the wires is increased to reduce the surface pressure, thereby reducing the frictional force, thereby reducing the disconnection rate of the wire due to friction.

In addition, since the structure of the center strand is different from the conventional product, there is an advantage that the source of the product can be easily identified by looking only at the center strand in the end use, and the wire cable of the present invention is particularly useful for small machines where flexibility and wear resistance are important. Can be utilized.

Claims (2)

The structure of the center strand 30 constitutes a twisted inner layer that surrounds the outer circumferential surface of the center element wire 31 while the inner layer wires 32 are in contact with each other, and the two types of element wires 33 having different circumferences around the inner layer. (34) are made by enclosing the alternating twisted five by five, and the outer layer of the outer strand (35) is enclosed by the outer layer of the outer strand (35) of the six strands surrounding the outer circumferential surface of the central strand 30 again (6 × A wire cable for a small mechanical device, characterized by the stranded structure of 7). The wire cable according to claim 1, wherein the 16 strands of the central strand constituting the wire cable are crimped and reduced in the range of 1 to 5% before the final stranded wire.