JPH10159832A - Inner cable for push-pull control cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inner cable with less chattering and rattling without decreasing load efficiency and increasing no-load sliding resistance by forming a smallest possible clearance between a conduit and the inner cable inserted to the conduit in a slidable manner. SOLUTION: An inner cable 10 for a push-pull control cable contains a core 1 and N-pieces of strands spirally wound around the core 1. The diameter of the core is greater than that of the strand 2, the diameters of M-pieces of strands 2a out of N-pieces of strands 2 are greater than those of (M-N)pieces of strands 2b, N and M are integers which are satisfied with 1<=M<=0.3N, N is satisfied with N>=4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an inner cable. More specifically, the present invention relates to an inner cable, wherein the diameter of M (1 ≦ M ≦ 0.3N) strands of N strands wound around a core wire is larger than the diameters of other strands.

[0002]

2. Description of the Related Art Conventionally, as an inner cable for a push-pull control cable, as shown in FIGS. 3A and 3B, a core made of a single wire or a stranded wire is used. An inner cable obtained by spirally winding a plurality of strands c having the same diameter around a line b is known (prior art 1).

[0003] A geared cable in which one relatively thick strand is spirally wound around a core wire made of a single wire or a stranded wire at an interval has also been employed as an inner cable of a control cable (prior art 2).

Japanese Utility Model Publication No. Sho 60-35787 discloses a spiral wire having a single wire or a twisted wire as shown in FIGS. A push composed of a plurality of main strands 32 wound and a plurality of sub-strands 33 smaller than the diameter of the main strands 32 spirally wound so as to be interposed between adjacent main strands 32. An inner cable for a pull control cable is disclosed (Prior Art 3).

In Japanese Utility Model Publication No. 63-11380,
As shown in FIGS. 5A and 5B, a plurality of strands 42 in which a number of strands are twisted around a core wire 41 are spirally wound, and a resin coating layer is formed on the outer surfaces of the plurality of strands. 44, and the resin coating layer 4
No. 4 discloses an inner cable for a push-pull control cable in which a thick portion 44a and a thin portion 44b are formed (Prior Art 4).

[0006] Japanese Patent Publication No. Hei 7-26640 discloses a core bar 53 made of a single linear steel wire as shown in FIG. 6 and a plurality of wires 55 wound around the core bar. A push-pull control cable including an inner cable 52 including a plurality of strands 54 and a conduit into which the inner cable is inserted is disclosed (prior art 5).

[0007] On the other hand, push-pull control cables have problems such as abnormal noise called "chatter" and hitting sounds generated when the cable is operated or terminated. Have been.

As a countermeasure against these problems, there is a method of reducing the clearance between the inner cable and the conduit. However, this causes a reduction in load efficiency and an increase in non-load sliding resistance, thereby impairing the basic performance of the control cable. Would.

Compared to the prior art 1, the prior art 3 has a large gap, the prior art 4 has a small friction coefficient due to sliding between resins, and the prior art 5 has a twisted strand structure. At this time, the load efficiency does not decrease much as compared with the prior art 1, but it does not reach a satisfactory level for eliminating chattering sound and hitting sound.

Accordingly, it is an object of the present invention to provide an inner cable for a control cable which does not cause a reduction in load efficiency or an increase in no-load sliding resistance, and does not generate chattering sound or hitting sound.

[0011]

An inner cable for a push-pull control cable according to the present invention is a push-pull control cable comprising a core wire and N strands spirally wound around the core wire. Wherein the diameter of the core wire is larger than the diameter of the strand, and of the N strands, the diameter of M strands is larger than the diameter of (N−M) strands; And M are 1 ≦ M ≦ 0.3
An integer that satisfies the relationship of N, wherein N satisfies the relationship of N ≧ 4.

It is preferable that M is 1.

It is preferable that the difference between the maximum finished outer diameter _Dmax and the minimum finished outer diameter _Dmin of the inner cable is 2 to 10% of the minimum finished outer diameter _Dmin .

It is preferable that each of the N strands is formed by twisting a plurality of strands.

It is preferable that N is 7 to 10.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An inner cable for a push-pull control cable according to the present invention (hereinafter simply referred to as "inner cable") will be described in detail with reference to the accompanying drawings.

FIG. 1 is an explanatory view showing an embodiment of the inner cable of the present invention. FIG. 2 is an explanatory sectional view of the inner cable of FIG.

The inner cable 10 of the present invention is
And N strands 2 spirally wound around the core wire 1. Of the N strands, M strands 2a have the remaining (N
-M) The diameter is larger than that of the strand 2b (where 1 ≦ M ≦ 0.3N).

Each of the strands 2a and 2b is formed by twisting a plurality of strands 3 respectively.

The number N of the strands 2 may be four or more, and is not limited to a specific number. However, in this embodiment, 7 to 10 are suitably used. Strand 2
Is not limited to a specific number, but in the present embodiment, 7 is preferably employed.

The number M of the strands 2a is 1 ≦ M ≦ 0.
Any integer satisfying the condition of 3N may be used, but 1 is most preferable.

In this embodiment, the diameter D ₁ of the core wire ₁ is 1.
Is 60 mm, the outer diameter D ₂ of the strands 2a 1.05
mm, and the outer diameter D ₃ of the strand 2b is 0.95 mm.
It is.

Therefore, in the case of the inner cable of this embodiment, the maximum finished outer diameter _Dmax is 3.6 mm, and the minimum finished outer diameter _Dmin is 3.5 mm.

The inner cable 10 according to the present embodiment is
The present invention can be suitably applied to any other conduit as well as the conduit shown in FIGS.

The minimum clearance L1 between the inner diameter d of the conduit 4 and the inner cable 10 (ie, (d-D
_max )) is about 0.05-0.15 mm, which is 1/2 of the conventional value. On the other hand, the maximum clearance L2 (i.e., (d-D _min )) between the inner diameter d of the conduit 4 and the inner cable 10 is about 0.15 to 0.25 mm.

The material of the core wire 1 is JIS G 356
SWO-A or SWO-B of 0 is preferably used, and the material of the strand 3 constituting the strand 2 is JI
A SGRH-62A galvanized wire of SG 3506 is preferably employed.

Next, with respect to Examples 1 and 2 of the inner cable of the present invention configured as described above, Comparative Examples 1 to 3
This will be described in comparison with.

Example 1 A single oil-tempered wire (SWO-A of JIS G 3560) having a diameter of 1.6 mm was used as the core wire 1, and M (M
= 1) 7 of 0.35 mm diameter as strands 2a
A twisted strand of galvanized steel wire 3 is used, and (NM) strands (where N = 7, M = 1) are used as strands 2b around the strand 3 having a diameter of 0.35 mm. Using a strand of 0.30 mm wire 3 wound, seven strands 2 were wound around the core wire 1 so as to be normally twisted to obtain an inner cable 10 shown in FIG.
A conduit having a liner formed of polytetrafluoroethylene was prepared as the conduit 4, and silicone grease was applied around the inner cable 10 and inserted into the conduit 4.

It should be noted, the difference between cases, the maximum finished outer diameter D _max and the minimum finished outer diameter D _min of this embodiment, a 2.9% of the minimum finished outer diameter D _min.

Example 2 A single oil-tempered wire having a diameter of 1.6 mm was used as the core wire 1, and seven galvanized steel wires having a diameter of 0.35 mm were used as M (M = 2) strands 2a. 3 (N−M) (where N = 7, M =
2) strand 3 having a diameter of 0.35 mm as strand 2b
Was wound around the core wire 1 so as to be normally twisted using a wire around which a wire 3 having a diameter of 0.30 mm was wound to obtain an inner cable 10 shown in FIG. A conduit having a liner formed of polytetrafluoroethylene was prepared as the conduit 4, and silicone grease was applied around the inner cable 10 and inserted into the conduit 4.

It should be noted, the difference between cases, the maximum finished outer diameter D _max and the minimum finished outer diameter D _min of this embodiment, a 2.9% of the minimum finished outer diameter D _min.

COMPARATIVE EXAMPLE 1 (See FIG. 6) One oil-tempered wire having a diameter of 1.6 mm was used as a core wire 53, and seven galvanized steel wires 55 having a diameter of 0.35mm were twisted as strands 54. Using the combined ones, seven strands 54 were wound around the core wire 53 in a normal twist, and then swaging was performed to obtain an inner cable 52 shown in FIG. In addition, the diameter of the inner cable 2 is 3.5 mm. For the conduit, Examples 1 to
The same as 2 was used.

Comparative Example 2 As Comparative Example 2, the inner cable of the above-mentioned prior art 3 was used. In this case as well, the conduit 4 of Examples 1 and 2 was adopted as the conduit.

Comparative Example 3 As Comparative Example 3, the inner cable of the above-mentioned prior art 4 was used. In this case as well, the conduit 4 of Examples 1 and 2 was adopted as the conduit.

The clearance between the conduit and the inner cable of each sample is as shown in Table 1.

With respect to the inner cables of Examples 1 and 2 and Comparative Examples 1 to 3, the load efficiency, the backlash and the sound pressure level of the hitting sound were measured, respectively. The measurement of the load efficiency and the backlash was performed using the measuring device shown in FIG. 9A. This is 963 mm long on the table 70
170 m radius control cable with conduit 4
The inner cable 10 is bent and fixed at 120 °, one end 10e of the inner cable 10 is connected with a reference load W or the like via pulleys 71 and 72 and a lever 73, and a push-pull force measuring device or the like is connected to the other end 10f. It is a concatenation. First, the measurement of the load efficiency is performed by measuring one end 10 e of the inner cable 10.
Was given a load N of pushing and pulling of 300 N, and the other end was pushed and pulled by a push-pull gauge to measure the pushing force (F1) and the pulling force (F2). As shown in FIG. 9B, the applied load W was changed by a pulley 71 at the time of a pulling operation, and by a weight connected by a lever 73 and a pulley 72 at the time of a pushing operation in a different direction. The described data is obtained by pushing and pulling about 10 times for each of 5 samples.
It is the average of the measured values obtained by measuring three times. The force transmission efficiency η (%) is calculated by the formula: (load (W) / operating force (F)) ×
It was determined by 100 (%). Table 1 shows the results.

The backlash is measured by fixing the other end 10f of the inner cable 10 to the apparatus shown in FIG.
A push / pull load of 50N was applied via the levers 1 and 72 and the lever 73, and the amount of movement at that time was measured.

Backlash is caused by the inner cable 10
The other end 10f is fixed at the center position L ₁ of the working stroke of the measured value of the reference distance L ₂ when applying a pressing load of 50N to the one end side and L _21, multiplied by the load pull of 50N It refers to L ₂₂ -L ₂₁ when the measured value of the reference distance L ₂ was L ₂₂ when. The measurement was performed with a caliper, and five samples were measured three times each. Table 1 shows the average value of the measurement results.

The sound pressure level of the striking sound was measured by assembling it with an actual vehicle and measuring the sound pressure level when a shift change was made (see FIG. 10). The results are shown in Table 1 and FIGS.

[0040]

[Table 1]

[0041]

According to the inner cable of the present invention, M
Only the strands (1 ≦ M ≦ 0.3N) exist with very little clearance from the conduit. Therefore, a sufficient gap is secured between the inner cable and the conduit, and the load efficiency and the no-load sliding resistance are not impaired. On the other hand, M strands are present with a very small clearance from the conduit, so that the striking sound and chattering sound are suppressed by the M strands.

That is, the push-pull control cable using the inner cable of the present invention can eliminate the striking noise and the chattering noise without lowering the load efficiency and increasing the no-load sliding resistance.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of an inner cable of the present invention.

FIG. 2 is an explanatory sectional view of the inner cable of FIG. 1;

FIG. 3 is an explanatory view showing an example of a conventional inner cable.

FIG. 4 is an explanatory view showing an example of a conventional inner cable.

FIG. 5 is an explanatory view showing an example of a conventional inner cable.

FIG. 6 is an explanatory view showing an example of a conventional inner cable.

FIG. 7 is a graph showing the relationship between load efficiency and backlash.

FIG. 8 is a graph showing a relationship between a sound pressure level and a load efficiency.

FIG. 9 is an explanatory diagram of a measuring device.

FIG. 10 is a diagram illustrating a method of measuring a striking sound.

[Explanation of symbols]

 1 core wire 2, 2a, 2b strand 3 strand

Claims (5)

[Claims] 1. An inner cable for a push-pull control cable comprising a core wire and N strands spirally wound around the core wire, wherein the diameter of the core wire is larger than the diameter of the strand. Large, the diameter of M strands among the N strands is (N−
M) greater than the diameter of the strand of the book, the N and M
Is an integer satisfying a relationship of 1 ≦ M ≦ 0.3N, and the N satisfies a relationship of N ≧ 4. 2. The inner cable according to claim 1, wherein said M is one. 3. The difference between the maximum finished outer diameter and the minimum finished outer diameter of the inner cable is 2 to 2 times the minimum finished outer diameter.
The inner cable according to claim 1 or 2, wherein the inner cable is 10%. 4. The inner cable according to claim 1, wherein the N strands are each formed by twisting a plurality of strands. 5. The inner cable according to claim 1, wherein said N is 7 to 10.