JP4596598B2 - Cable terminal coupling device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure for attaching a rod to a cable end and a connecting device for a cable end using the same.
[0002]
[Prior art]
In general, the control cable includes a flexible conduit and an inner cable slidably accommodated in the conduit. The terminal of the inner cable of the push-pull control cable is connected to an operating device for operating the inner cable and a driven device operated via the inner cable via a connecting device 100 as shown in FIG. 5a. The connecting device 100 includes a cable cap 102 fixed to an end portion of a conduit 101, a guide pipe 103 whose base end is swingably attached to the cable cap, and a rod slidably received in the guide pipe. 104. 5b, the end of the inner cable 105 slidably received in the conduit 101 penetrates the cable cap 102, and the end of the deep hole 106 formed in the proximal end of the rod 104. The rod 104 is fixed to the rod 104 by being inserted into the inside and caulking from the outer periphery a range of a position of about 3 mm to a position of about 15 mm from the end of the rod 104.
[0003]
In the coupling device 100 described above, for example, when the distal end side of the rod 104 is pushed and pulled in the directions of the arrows F1 and F2, the inner cable 105 is pushed and pulled accordingly and coupled to the other end side (right side in FIG. 5a). The driven device can be operated. Further, the rod 104 can be pushed and pulled by pushing and pulling the other end of the inner cable 105. The rod 104 is connected to, for example, a lever that rotates around an axis, and the swing of the rod 104 is absorbed by the swing of the guide pipe 103.
[0004]
[Problems to be solved by the invention]
In the conventional structure, when the guide pipe 103 is inclined as shown in FIG. 5B and the rod 104 is pushed (or drawn) in the direction of the arrow F1, the inner cable 105 is locally bent at the point P. It is done. Therefore, the bending stress applied to the core wire constituting the inner cable 105 is increased. Accordingly, it is necessary to increase the diameter of the inner cable or to use a high-strength core wire in order to prevent fatigue breakage due to repeated operation over a long period of time. The present invention provides a rod attachment structure to a cable terminal that can relieve local bending stress when used in a connecting device as described above, can prevent fatigue due to repeated bending, and can improve durability. It is a technical issue to provide. Furthermore, this invention makes it the subject to provide the connection apparatus of a cable terminal with high durability.
[0005]
[Means for Solving the Problems]
A cable terminal connecting device according to the present invention (Claim 1) includes a holder, a cable cap housed in the holder, a conduit fixed to one end of the cable cap, and a base end of the other end of the cable cap. A guide pipe slidably attached to the guide pipe, a rod slidably received in the guide pipe, and slidably received in the conduit, penetrating the cable cap, and its end being at the proximal end of the rod An inner cable fixed inside, and at the end of the rod, a straight-shaped first hole having an inner diameter larger than the cable, and extending from the bottom of the first hole, having substantially the same inner diameter as the cable A second hole is formed, the inner diameter of the first hole is 1.2 to 2.5 times the diameter of the cable, and the length (depth) is 2.8 to 10 times the diameter. end of the cable There is inserted into the first bore and the second bore, and characterized in that it is fixed by crimping the external corresponding to the second hole to the second hole.
[0006]
A second aspect (Claim 2) of the cable terminal coupling device of the present invention is a holder, a cable cap housed in the holder, a conduit fixed to one end of the cable cap, and a proximal end of the cable cap. A guide pipe that is swingably attached to the other end of the cable cap, a rod that is slidably received in the guide pipe, a slide that is slidably received in the conduit, passes through the cable cap, An inner cable fixed to the inside of the base end of the rod, and a straight hole having a larger inner diameter than the cable at the end of the rod and a cable extending from the bottom of the first hole. A second hole having the same inner diameter is formed, the inner diameter of the first hole is 1.2 to 2.5 times the diameter of the cable, and the length (depth) is 10 to 20 mm. Oh is, the cable Bull terminal is inserted into the first hole and the second hole, it is characterized that you have been fixed from the outside by caulking the second hole corresponding to the second hole.
[0007]
In such a cable terminal connecting device, the casing cap includes a bush for allowing the inner cable to pass through , and the second end from the tip of the bush on the rod side when the rod is closest to the holder side . It is preferable that the distance to the outlet of the hole is about twice the length from the tip of the rod to the tip of the bush (claim 3).
[0008]
[Operation and effect of the invention]
In the mounting structure used in the cable terminal coupling device of the present invention, the cable coming out of the second hole is free in the first hole (hole having a large diameter). Therefore, when a lateral force is applied to the cable coming out from the end of the rod, the cable bends gently over a relatively long range from the part coming out of the second hole to the mating member (cable cap, etc.). Therefore, the bending stress is not applied locally to the core wire constituting the cable, and the maximum value is greatly reduced. Therefore, the durability is greatly increased. In addition, when a cable contact | abuts to a rod in the exit part of a 1st hole, it does not incline any more. Therefore, also in that case, the bending stress at the second outlet portion is relaxed.
[0009]
The inner diameter of the first hole varies depending on the thickness of the rod, but is usually 1.2 to 2.5 times the diameter of the cable, particularly about 1.4 to 1.8 times, and the length is 2. It is preferably 8 to 10 times, for example 10 to 20 mm, whereby the maximum bending stress is reduced to about 30 to 50%. The first hole can be tapered toward the outlet, but the same effect can be obtained with a so-called straight hole having the same diameter, and processing is easy.
[0010]
Since the connecting device for a cable terminal according to the present invention employs the above-described mounting structure at the connecting portion between the inner cable and the rod, the bending stress of the inner cable is reduced and the durability is improved.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the mounting structure and the coupling device of the present invention will be described with reference to the drawings. 1a and 1b are a cross-sectional view showing an embodiment of the connecting device of the present invention and an enlarged cross-sectional view thereof, FIG. 2 is an enlarged cross-sectional view of a main portion of a rod used in the connecting device, and FIGS. 3b is a sectional view showing an example and a comparative example of the mounting structure used in the comparative experiment, and FIG. 4 is a graph showing the result of the comparative experiment.
[0012]
A connecting device 10 shown in FIG. 1a has a configuration almost the same as that of a conventional one, and includes a holder 11 attached to a stationary member such as an automobile panel, and a cylindrical cable cap 12 accommodated in the holder 11. A guide pipe 13 whose base end is swingably attached to the cable cap 12 and a rod 14 slidably received in the guide pipe 13 are provided. A rubber damper 15 is interposed between the cable cap 12 and the holder 11. As shown in FIG. 1 b, at the connecting portion between the cable cap 12 and the guide pipe 13, the spherical enlarging portion 17 at the end of the guide pipe 13 is loosely fitted in the recess 16 formed at the end of the cable cap 12. Then, the periphery of the end portion of the cable cap 12 is caulked to a somewhat small diameter to be connected and held in a swingable manner (see reference numeral 18).
[0013]
Returning to FIG. 1 a, the end of the conduit 20 of the push-pull cable is secured to the other end of the cable cap 12 by caulking or the like after stripping the coating. An inner cable (inner cable) 21 is slidably accommodated in the conduit 20, and a portion protruding from the conduit 20 is guided into the guide pipe 13 through the cable cap 12, and the base of the rod 14. It is fixed in the end by caulking. Reference numeral 22 indicates the crimped portion. A rubber boot 23 is placed between the guide pipe 13 and the cable cap 12 to protect the inner cable 21.
[0014]
The connecting device is characterized by a mounting structure 24 for the rod 14 to the end of the inner cable 21, as shown in detail in FIG. 1b. That is, in this attachment structure 24, a first hole 26 having a diameter larger than that of the inner cable 21 is formed at the end of the rod 14, and a second for caulking the inner cable 21 at the bottom 27 of the first hole 26. Hole 28 is formed. The first hole 26 and the second hole 28 are arranged concentrically. Reference numeral 29 in FIG. 1b denotes a cylindrical bush made of a synthetic resin such as polyacetal (POM).
[0015]
FIG. 2 shows the end of the rod 14 before the inner cable 21 is inserted and crimped. The inner diameter d1 of the first hole 26 is preferably about 1.2 to 2.5 times the outer diameter of the inner cable 21, and more preferably about 1.4 to 1.8 times. When the inner diameter d1 of the first hole 26 is small, the inner cable 21 comes into contact with the outlet portion 31 of the first hole 26, so that the bending stress at the outlet portion of the second hole 28 is greatly relieved. The bending angle at the exit portion 31 of one hole 26 is increased, and the bending stress at that portion is increased. Conversely, when it is too large, since the thickness of the rod 14 becomes thin, the guide action is reduced.
[0016]
The length T1 of the first hole 26 is preferably about 2.8 to 10 times, particularly about 6.5 to 7.5 times the outer diameter of the inner cable 21. When the length T1 of the first hole 26 is shallow, the length of the symbol L1 in FIG. 1b is shortened, so that the bending action of the inner cable is not sufficiently relaxed. On the other hand, when the depth is too deep, the processing becomes difficult even though the bending stress relaxation action does not increase so much. The outlet portion 31 of the first hole 26 has a tapered chamfer. The chamfer has a triangular shape with a short side of about 0.5 to 1 mm or an arc-shaped cross-section with the same radius.
[0017]
The second hole 28 is similar to the hole for caulking the cable end in the conventional mounting structure, and the inner diameter d2 thereof is substantially the same as or slightly smaller than the outer diameter (nominal diameter) of the inner cable 21. The length T2 is about 8.5 to 20 times the outer diameter of the inner cable 21. Then, after the end of the inner cable 21 is inserted into the rod 14 and fitted into the second hole 28, the portion corresponding to the second hole 28 is caulked from the outer periphery of the rod 14, whereby It is fixed.
[0018]
1B, the connecting device 10 configured as described above is provided at the outlet 30 of the second hole 28 even when the inner cable 21 is pulled in the direction of the arrow F1 and the rod 14 is closest to the holder 11 side. The bending angle is small. That is, the length L1 between the outlet 30 of the second hole 28 and the inlet of the bush 29 is about twice as long as the length L2 from the end of the rod 14 to the end of the bush 29. Therefore, compared with the conventional structure, the angle formed by the axis of the rod and the center line of the inner cable 21 is approximately ½. Therefore, the bending stress at the outlet portion 30 of the second hole 28, particularly the combined bending stress generated in the core wire when a tensile force is applied to the inner cable 21 having the strictest conditions is reduced. Therefore, the durability of the inner cable 21 is high even if the rod 14 is repeatedly reciprocated many times.
[0019]
Depending on the inner diameter of the first hole 26, the inner cable 21 may come into contact with the outlet 31 of the first hole 26 in the state shown in FIG. In that case, the bending angle of the inner cable 21 is limited at the outlet 31 of the first hole 26, and the bending stress at that portion is further relaxed.
[0020]
In the above-described embodiment, the attachment structure adopted for the inner cable and rod connecting portion of the push-pull control cable is shown. However, the attachment structure of the present invention does not use the inner cable and rod attachment portion of the pull control cable or the conduit. In the case of using the cable alone, it can also be adopted for the connecting portion between the cable and the rod, and the same effect can be obtained.
[0021]
【Example】
Next, the effects of the structure of the present invention will be described with reference to examples and comparative examples.
[Example 1] As shown in FIG. 3a, the first end of an inner diameter of 3.5 mm and a length of 35 mm is attached to the end of a rod 14 made of cold forged carbon steel wire (SWCH) having an outer diameter of 6 mm and a length of 100 mm. The hole 26 and a second hole 28 having an inner diameter of 2.3 mm and a length of 15 mm are formed, and the inner cable 21 having an outer diameter of 2.3 mm is inserted into the second hole 28 and caulked to obtain the mounting structure of the first embodiment. did. The inner cable 21 is an inner cable of a push-pull cable in which a hard steel wire (SWRH) wire having an outer diameter of 0.35 mm is stranded on the outside of an oil temper wire (OT wire) having an outer diameter of 1.6 mm.
[0022]
[Comparative Example 1] As shown in FIG. 3b, the same as Example 1 except that only the second hole 28 having the same inner diameter 2.3 mm and length 15 mm as in Example 1 is formed and the first hole 26 is not provided. The same structure was used as the attachment structure of Comparative Example 1.
[0023]
When the mounting structure of Example 1 was processed, the average distortion and distortion amplitude of the inner cable 21 at the point D inside the second hole 28 and at the point D outlet 31 inside the first hole 26 were measured. . The result is shown in the graph of FIG. In FIG. 4, the measurement value at point D inside the second hole 28 is indicated by a symbol D, and the measurement value at the outlet 31 of the first hole 26 is indicated by symbol C.
[0024]
In addition, the average distortion and distortion amplitude at the outlet 30 of the second hole 28 in the mounting structure of Comparative Example 1 are indicated by a plot A and a line B.
[0025]
As is clear from the above results, in the mounting structure of Example 1, both the average distortion and the distortion amplitude are significantly lower than in the mounting structure of Comparative Example 1. Therefore, it can be seen that the bending stress is greatly reduced and the durability is improved.
[Brief description of the drawings]
FIGS. 1a and 1b are a cross-sectional view and an enlarged cross-sectional view of an essential part showing an embodiment of a connecting device of the present invention, respectively.
FIG. 2 is an enlarged cross-sectional view of a main part of a rod used in the coupling device of FIG.
FIGS. 3a and 3b are cross-sectional views showing an example and a comparative example of the mounting structure used in the comparative experiment, respectively.
FIG. 4 is a graph showing the results of the comparison experiment.
FIGS. 5a and 5b are a cross-sectional view and an enlarged cross-sectional view of an essential part of an example of a conventional coupling device, respectively.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Connecting apparatus 11 Holder 12 Cable cap 13 Guide pipe 14 Rod 15 Damper 16 Recess 17 Enlarged part 18 Caulking part 20 Conduit 21 Inner cable 22 Caulking part 23 Boot 24 Mounting structure 26 First hole 27 Bottom part 28 Second hole 29 Bush 30 Second hole outlet 31 First hole outlet L1 Length from first hole to bush L2 Length from rod end to bush d1 Inner diameter d2 of first hole Second Hole inner diameter T1 First hole length T2 Second hole length

Claims (3)

With a holder,
A cable cap housed inside the holder;
A conduit secured to one end of the cable cap;
A guide pipe whose base end is swingably attached to the other end of the cable cap;
A rod slidably received in the guide pipe;
The inner cable is slidably accommodated in the conduit, penetrates the cable cap, and the terminal is fixed to the inside of the base end of the rod,
The end of the rod, a first hole of the straight shape of the larger inner diameter than the cable, extending from the bottom of the first hole, and a second hole of the cable substantially the same inner diameter is formed,
The inner diameter of the first hole is 1.2 to 2.5 times the diameter of the cable, and the length is 2.8 to 10 times the diameter;
The terminal of the cable is inserted into the first bore and the second bore, the outside from the crimped second secured to holes and cable end end coupling device corresponding to the second hole. With a holder,
A cable cap housed inside the holder;
A conduit secured to one end of the cable cap;
A guide pipe whose base end is swingably attached to the other end of the cable cap;
A rod slidably received in the guide pipe;
The inner cable is slidably accommodated in the conduit, passes through the cable cap, and the terminal is fixed to the inside of the proximal end of the rod.
A straight-shaped first hole having an inner diameter larger than that of the cable and a second hole having substantially the same inner diameter as that of the cable extending from the bottom of the first hole are formed at the end of the rod.
In 1.2 to 2.5 times the diameter of the inner diameter of the first hole cables, Ri is 10~20mm der length,
The terminal of the cable is inserted into the first bore and the second bore, the outside from the crimped second secured to holes and cable end end coupling device corresponding to the second hole. The casing cap has a bush for allowing the inner cable to pass through, and the distance from the tip of the bush on the rod side to the outlet of the second hole when the rod is closest to the holder side is The cable terminal coupling device according to claim 1, wherein the length of the cable terminal is approximately twice the length from the tip of the bush to the tip of the bush.

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