JP2001140848A - Inner cable and control cable using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inner cable and a control cable in which backrush can be reduced without deteriorating load efficiency and no-load sliding resistance, durability is enhanced, and its manufacture is easy to carry out, compared with conventional ones. SOLUTION: This inner cable 10 comprises: a conductor 11; a single strand 12 wound around the conductor 11 in a soft spiral manner; and a plurality of side strands 13 wound around the conductor 11 on the single strand 12 so as to be wound in a soft spiral manner in a torsional direction opposite to a torsional direction of the single strand 12. The side strands 13 are projected so as to be ridged at positions where the side strands 13 ride over the single strand 12. This innercable 10 is stored in a conduit 20 thereby to obtain the control cable 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner cable (inner cable) for a control cable and a control cable using the same. More specifically, an inner cable for a control cable, which is used for a push-pull control cable for connecting a shift lever and a transmission of an automobile and which can reduce backlash by reducing clearance with an outer casing (conduit), and the like. It relates to the control cable used.

[0002]

2. Description of the Related Art Generally, a control cable has a clearance between an outer casing and an inner cable, which causes backlash in reciprocating operation of the inner cable. In order to reduce such backlash, it is conceivable to make the clearance between the inner cable and the outer casing as small as possible.
In that case, the load efficiency decreases and the no-load sliding resistance increases.

To solve such a problem, Japanese Patent Laid-Open No.
As shown in FIGS. 7A and 7B, the outer diameter of one or a plurality of side strands 103 among side strands 102 and 103 spirally wound around a core wire 101, as shown in FIGS. Has proposed an inner cable 104 for a push-pull control cable larger than the outer diameter of the side strand 102. In this case, the strand 103 having a large outer diameter is in close contact with the inner surface of the outer casing without any clearance, and the clearance remains between the other side strand 102 and the inner surface of the outer casing. Further, the backlash can be reduced to some extent without significantly increasing the load sliding resistance.

However, in this case, only one or two or three thick strands 103 are in strong sliding contact with the outer casing, and the contact pressure is increased. If the number of the thicker strands 103 is increased in order to reduce the load, the contact area with the outer casing increases, and the clearance decreases, so that there is a problem that the no-load sliding resistance value increases. Further, since the thick strand 103 and the thin strand 102 are combined, the material management and the management of the assembly process are complicated.

On the other hand, Japanese Utility Model Laid-Open No. 63-180716 discloses that the inner surface of the liner 106 of the outer casing 105 has a non-circular cross section such as a square as shown in FIG.
A control cable 108 in which a normal inner cable 107 is inserted into the outer casing 105 is disclosed. This is also partially closed between the inner cable 107 and the outer casing 105 to reduce the clearance, and by partially providing a gap,
There is an advantage that backlash can be reduced. However, it is difficult to accurately process the inner surface of the liner 106 into a non-circular shape, and a dimensional error occurs. There is also a problem that the sliding resistance increases due to thermal deformation.

[0006]

SUMMARY OF THE INVENTION The present invention can reduce the backlash without deteriorating the load efficiency and the no-load sliding resistance as compared with conventional products, and has high durability and is easy to manufacture. The technical problem is to provide a simple inner cable and a control cable.

[0007]

An inner cable for a control cable according to the present invention comprises a core wire, a ridge provided in a gentle spiral around the core wire, and a core wire from above the ridge. It is characterized by comprising a plurality of side strands wound around in a gentle spiral in a twist direction opposite to the spiral direction of the ridge. In such an inner cable, the ridge can be a single strand wound around the core wire. In that case, the core wire may be a thick single wire.

[0008] A control cable according to the present invention is characterized by comprising the above-mentioned inner cable and an outer casing for slidably guiding the inner cable.

[0009]

When attention is paid to a specific side strand, it protrudes at a portion overlapping with the ridge on the lower side, and adheres to the surface of the core wire at other portions. And it overlaps with a ridge in a plurality of parts of the length direction, and it projects in those parts. Further, in the side strand adjacent to the side strand, the portion of the single strand that is displaced in the direction in which the spiral extends extends overlaps with the ridge, and projects in a gentle mountain shape at that portion.
Therefore, since the plurality of side strands project sequentially along the helix of the ridge, a ridge extending in a gentle mountain shape is formed in the entire inner cable.

Therefore, when the inner cable is slidably housed in the outer casing, all the side strands partially contact the inner surface of the outer casing or slide with a small clearance, and the other strands have a certain degree of clearance. Clearance will remain. As a result, the load efficiency and the no-load sliding resistance do not deteriorate so much, and the backlash is reduced. Further, since the plurality of side strands are in sliding contact with the inner surface of the outer casing, the burden on each side strand or the inner surface of the liner of the outer casing is small. Further, since the side strands are all the same, material management and manufacturing process management are easy. In addition, a normal outer casing can be used.

When the ridge is formed as a single strand spirally wound around a core wire, an ordinary core wire can be used, and therefore, the production is easy. In this case, when the core is a thick single wire, the force in both the push and pull directions can be transmitted smoothly. Also, unlike a stranded wire, the surface of the core wire is smooth, so that a spiral ridge formed of a single strand and a plurality of side strands has a uniform cross-sectional shape. Therefore, close contact between the single strand and the inner surface of the outer casing can be further ensured.

Since the control cable of the present invention uses the above inner cable, the load efficiency is high,
Low no-load sliding resistance, low backlash, and easy to manufacture.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an inner cable and a control cable according to the present invention will be described with reference to the drawings. FIG. 1A is a partially cutaway perspective view showing an embodiment of the inner cable of the present invention, and FIG.
1c is a sectional view taken along the line III-III of FIG. 1a, FIGS. 2a and 2b are sectional views showing other embodiments of the inner cable of the present invention, and FIG. 2c is a sectional view of the control cable of the present invention. 3a and 3b are perspective views showing another embodiment of the inner cable of the present invention, and FIG. 4 is an explanatory view showing a method for measuring the effect of the control cable of the present invention. 5 and 6 are graphs showing the measurement results.

The inner cable 10 shown in FIG.
1, a single strand 12 spirally wound in a Z twist around the core wire with a space between the pitches, and a plurality of single strands spirally wound in an S twist around the core wire 11 so as to cover the single strand And the other side strand 13. Adjacent side strands 13 are almost in close contact with each other without any space. In this embodiment, the number of the side strands 13 is 15 (see FIG. 1B). The single strand may be S-twisted and the side strand may be Z-twisted.

The core 11 is made of JI as in the prior art.
SG3560 SWO-A or SWO-B carbon steel oil-tempered wire is preferably used. The diameter is, for example, about 0.8 to 3.5 mm, particularly about 0.8 to 2.6 mm. As for the side strand 13, a hard steel wire of JIS G3521 is used as in the conventional case. The number of the side strands 13 is, for example, about 9 to 20, and the twist pitch is about 8 to 22 mm. The diameter of the side strand 13 varies depending on the number of spirally wound wires around the core wire 11, but is usually about 0.3 to 1.0 mm, particularly about 0.3 to 1.0 mm.
It is about 0.6 mm. For example, the core wire 11 is 1.6 mm
When the number of the side strands 13 is 15, the diameter of the side strands 13 is about 0.35 mm.

The single strand 12 is made of, for example, a galvanized steel wire and has a diameter of 1/5 of the side strand.
It is about １ ／, particularly about 、 to ３, for example, about 0.09 to 0.12 mm. Single strand 12
If the diameter of the single strand is too large, the protrusion of the side strand 13 becomes too large, and the frictional resistance becomes large. If the diameter of the single strand is too small, the effect of reducing the backlash decreases. The number of single strands 12 is usually one. However, two or more of them may be used as described later.

As a method of winding the single strand 12 around the core wire 11, a method of laying a single winding machine at the head of the side strand twisting machine or the like is adopted. Winding conditions are such that the pitch is about 1 to 5 times the side strand pitch. When a plurality of the side strands 13 are wound thereon, a tubular type winding machine or the like is used as in the conventional case, and the winding is performed under the same conditions as the conventional winding tension.

In the inner cable 10 configured as described above, as shown in FIG. 1C, a portion 14 of the side strand 12 that passes over the single strand 12 projects in a gentle mountain shape. The projecting portion 14 of each adjacent side strand 13 extends spirally around the core wire 11 along the single strand 12 therebelow, and if a number of mountain-like projecting portions are gathered, a spiral ridge 15 is formed. Is formed. Therefore, in view of the overall shape, the above-mentioned Japanese Patent Application Laid-Open No.
9832 is similar to the conventional inner cable. However, in the conventional cable, a spiral ridge is formed by one thick strand, whereas FIG.
The inner cable 10 of FIG.
Gather to form the ridge 15.

In the above embodiment, the core wire 11 is made of one steel wire. However, as shown in FIG. 2A, a wire obtained by twisting a plurality of metal wires 16 is used as the core wire 11. You can also. In addition, a strand obtained by twisting a plurality of metal wires 17 can be employed as the side strand 13. Furthermore, a single strand 12 may be obtained by combining or bundling a plurality of metal strands.

In the above embodiment, the single strand 12 is 1
Although it is a book, three single strands 12 arranged at equal intervals around the core wire 11 as shown in FIG. 2B can also be used. Also, two or four or more single strands can be used. However, the single-strand 12 is so fixed that the range of adhesion of the side strand 13 to the core 11 is not reduced.
It is preferable that the interval between them is about 0.5 to 5 times the 12-side strand pitch in consideration of the balance between the no-load sliding resistance and the load efficiency.

As shown in FIG. 2C, the inner cable 10 is turned into a control cable 30 by being housed in an outer casing (conduit) 20. The outer casing 20 includes a tubular liner 21 made of a synthetic resin, a shield layer 22 composed of a plurality of metal wires 22a spirally wound around the liner 21, and a coating layer 23 made of a synthetic resin that covers the periphery thereof. . The shield layer is formed of a fiber-reinforced resin wire, or in place of the synthetic resin shield layer 22, another armor layer that is formed by densely spirally winding a single metal wire having a rectangular cross section in a tube shape is used. An outer casing of a form can be adopted.

The control cable 30 constructed as described above is a single strand 1 of the side strands 13.
In the part 31 which protrudes on the mountain 2 on the mountain shape and the part 32 on the opposite side, the side strand 13 and the liner 2
1 has a small clearance on the inner surface, and an appropriate clearance remains between the side strand 13 and the inner surface of the liner 21 distant from them. The portion where the clearance is small extends spirally with respect to the core wire 11. Therefore, the outer casing 2 of the inner cable 10
There is little backlash in the horizontal direction within 0, so there is little backlash. In addition, since an appropriate clearance is maintained in portions other than the above-described portions, the frictional resistance between the outer casing 20 and the inner cable 10 is small. Therefore, the load efficiency, which is an index of the frictional resistance when sliding while applying a load, is high, and the no-load sliding resistance, which indicates the degree of friction when there is no load, is low.

In the above-described embodiment, a case where a single strand is spirally wound around the core wire 11 is shown. As shown in FIG. 3A, a core wire 36 integrally provided with a spiral ridge 35 is provided. Can also be used. Such a core wire 36 can be manufactured by drawing. Further, as shown in FIG. 3B, when the core wire 10 is formed by twisting a plurality of metal wires 16, a single wire 16 a around the wire is made thick, thereby forming a spiral ridge. You may comprise. Also for these inner cables 10, the ridges 35 and the ridges on the surface of the inner cable are formed on the surrounding side strands 13 along the thick wires 16a, and the same operation and effect as in the above-described case are exhibited.

[0024]

Next, the effects of the present invention will be described with reference to specific examples and comparative examples. Example 1 A carbon steel oil-tempered wire having a diameter of 1.6 mm was used as a core wire, and a single strand made of a galvanized steel wire having a diameter of 0.1 mm was spirally wound around the periphery thereof in a Z twist at a pitch of 36 mm. The inner cable of Example 1 was manufactured by spirally winding 15 side strands made of galvanized steel wire having a diameter of 0.35 mm into S-twist at a pitch of 12 mm.

[Embodiment 2] The pitch of a single strand is 24
The inner cable of Example 2 was manufactured in the same manner as the inner cable of Example 1 except that it was set to mm.

[Comparative Example 1] A carbon steel oil-tempered wire having a diameter of 1.6 mm was used as a core wire, and a diameter of 0.3 mm was wound around the wire.
As a comparative example 1, an inner cable of a current product in which 15 side strands made of a 5 mm galvanized steel wire were spirally wound in S-twist at a pitch of 12 mm was used.

Comparative Example 2 An inner cable of Comparative Example 2 was manufactured in the same manner as in Comparative Example 1 except that one of the side strands was increased in diameter to 0.45 mm (see FIGS. 7A and 7B).

Samples were obtained by cutting the inner cables of Examples 1 to 3 and Comparative Examples 1 and 2 to a length of 1000 mm. Further, they were sized 2.5 mm in inner diameter and 4.2 m in outer diameter.
m, a tube-shaped liner made of polytetrafluoroethylene and 17 spirally wound diameters of 0.1 mm.
The control cable was housed in an outer casing (940 mm in length) composed of a shield layer made of a hard steel wire of 884 mm and a coating layer made of polypropylene and having an outer diameter of 8.5 mm provided therearound. The space between the inner cable and the outer casing was filled with silicon-based grease in a usual manner.

The above control cable was routed in a form corresponding to the actual vehicle routing state shown in FIG. 4, and the no-load sliding resistance, load efficiency and backlash were measured. As for the no-load sliding resistance, one end of the inner cable 10 (the side indicated by reference numeral 41 in FIG. 4) is made free, and the other end is pushed and pulled by a push-pull gauge composed of a motor-driven crank mechanism via a rod 42. The resistance at that time was measured. The load efficiency η _w is determined by applying a load W (147N) in the pulling direction or a load W (14N) in the pushing direction to one end of the inner cable.
7N), and the load is expressed as a percentage using the operating force F required to perform the push-pull operation at the other end as a denominator. That is, the load efficiency η _w = W / F × 100 (%). The backlash was measured by fixing one end of the inner cable (reference numeral 41) at the center of the stroke and moving the other end when a load of 20N was applied to the other end. For each of Examples 1 and 2 and Comparative Examples 1 and 2, the initial performance of the control cable was measured, and the durability of each of the samples was measured each time the operation was repeated 100,000 times. In the durability test, the backlash was measured by pushing and pulling at 20N.

The results of the above measurements are shown in Tables 1-3 and FIGS.
6 is shown in the graph.

[Table 1]

[Table 2]

[Table 3]

According to the graphs in Tables 1 to 3 and FIGS. 5 to 6, the inner cables of Examples 1 and 2 have almost the same no-load sliding resistance as Comparative Examples 1 and 2, and the load efficiency is slightly better. . As for backlash, 1 of Comparative Example 1 was used.
/ 3 (in the case of 20 N). Further, compared to Comparative Example 2, the value is reduced to about ／ (in the case of 20 N).

[Brief description of the drawings]

FIG. 1a is a partially cutaway perspective view showing an embodiment of an inner cable of the present invention, and FIG. 1b is a II-I of FIG. 1a.
1c is a sectional view taken along line III-III of FIG. 1a.

2A and 2B are cross-sectional views showing another embodiment of the inner cable of the present invention, and FIG. 2C is a cross-sectional view showing one embodiment of the control cable of the present invention.

3A and 3B are perspective views showing still another embodiment of the inner cable of the present invention.

FIG. 4 is an explanatory view showing an apparatus for measuring the effect of the control cable of the present invention.

FIG. 5 is a graph showing the measurement results.

FIG. 6 is a graph showing the measurement results.

7A is a partially cutaway perspective view showing an example of a conventional inner cable, FIG. 7B is a sectional view taken along the line VV, and FIG. 7C is a sectional view showing an example of a conventional control cable.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Inner cable 11 Core wire 12 Single strand 13 Side strand 14 Override part 15 Ridge 18 Ridge 19 Element wire 19a Thick element wire 20 Outer casing 21 Liner 22 Shield layer 22a Metal element wire 23 Coating layer 31 Portion protruding in mountain shape 32 Opposite side 41 One end of inner cable 42 Rod on other end of inner cable

Claims (4)

[Claims] 1. A core wire, a ridge provided in a gentle spiral around the core wire, and a gently twisted direction opposite to the spiral direction of the ridge from above the ridge around the core wire. Inner cable for control cable consisting of multiple side strands wound spirally. 2. The inner cable according to claim 1, wherein the ridge is a single strand spirally wound around a core wire. 3. The inner cable according to claim 2, wherein the core wire is a thick single wire. 4. A control cable comprising the inner cable according to claim 1, 2 or 3, and an outer casing for slidably guiding the inner cable.