Bending fatigue testing apparatus for string-like members

Abstract

The present invention provides a bending fatigue testing apparatus for string-like members that can simultaneously perform bending fatigue tests on string-like members of different diameters. [Solution] The bending fatigue testing apparatus 100 for a string-like member according to the present disclosure comprises: a pair of first cylindrical jigs 21, 22 that clamp the first string-like member SM1 so that the first string-like member SM1 bends at the minimum bending radius; a pair of second cylindrical jigs 23, 24 that clamp the second string-like member SM2 having a larger diameter than the first string-like member SM1 so that the second string-like member SM2 bends at the minimum bending radius; and a holding part 10 that holds the pair of first cylindrical jigs 21, 22 so that they can move in a direction perpendicular to the axis of the first string-like member SM1 and the axis of the pair of first cylindrical jigs 21, 22 in a first region A1, and holds the pair of second cylindrical jigs 23, 24 so that they can move in a direction perpendicular to the axis of the second string-like member SM2 and the axis of the pair of second cylindrical jigs 23, 24 in a second region A2.

Description

Technical Field

[0001] The present disclosure relates to a bending fatigue test apparatus for a string-shaped member.

Background Art

[0002] The cable bending jig disclosed in Patent Document 1 includes a pair of clamping portions and a bending reference member. The pair of clamping portions are formed to be bendable, extend along the longitudinal direction of the cable, and clamp the cable from both sides. The bending reference member is formed in an arc shape and abuts against the clamping portion when bending the cable together with the clamping portion to restrict the bending of the clamping portion. The cable bending jig is suitable for a bending test in which the cable is bent multiple times or bent in the opposite direction.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The inventors of the present application have discovered the following technical problems. There is a bending fatigue test in which a string-shaped member is bent multiple times or bent in the opposite direction. When performing a bending fatigue test using the above-described cable bending jig, a bending reference member corresponding to the diameter of the test target string-shaped member is used. Therefore, it is difficult to simultaneously perform a bending fatigue test on a plurality of string-shaped members having different diameters using one bending fatigue test apparatus. Thus, it has not been possible to improve the efficiency of the bending fatigue test and shorten the time.

[0005] The present disclosure has been made in view of the above-described problems, and provides a technique capable of simultaneously performing a bending fatigue test on string-shaped members having different diameters.

Means for Solving the Problems

[0006] The bending fatigue testing apparatus for the string-like member relating to this disclosure is: A pair of first cylindrical jigs for holding the first string-like member so that the first string-like member bends with the minimum bending radius, A pair of second cylindrical jigs for clamping the second string-like member, which has a larger diameter than the first string-like member, so that the second string-like member bends with the minimum bending radius, A holding portion that holds the pair of first cylindrical jigs so as to be movable in a direction perpendicular to the axis of the first string-like member and the axis of the pair of first cylindrical jigs in a first region, and holds the pair of second cylindrical jigs so as to be movable in a direction perpendicular to the axis of the second string-like member and the axis of the pair of second cylindrical jigs in a second region, It comprises four C-shaped jigs that clamp onto both sides of the pair of second cylindrical jigs, The holding portion has a plurality of key grooves into which one end and the other end of the pair of first cylindrical jigs and the pair of second cylindrical jigs are respectively inserted. [Effects of the Invention]

[0007] According to this disclosure, bending fatigue tests can be performed simultaneously on string-like members of different diameters. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram showing a bending fatigue testing apparatus according to Embodiment 1. [Figure 2] Figure 1 shows a schematic cross-sectional view of the main part of the bending fatigue testing apparatus along the cutting line II-II. [Figure 3] Figure 1 shows a schematic cross-sectional view of the main part of the bending fatigue testing apparatus along the cutting line III-III. [Modes for carrying out the invention]

[0009] Specific embodiments of the present invention will be described in detail below with reference to the drawings. However, the present invention is not limited to the following embodiments. Also, for clarity of explanation, the following description and drawings have been simplified as appropriate.

[0010] <Embodiment 1> Embodiment 1 will be described with reference to Figures 1 to 3.

[0011] It should be noted that the right-handed XYZ coordinate system shown in Figure 1 and other drawings is for convenience in explaining the positional relationships of the components. Typically, the positive Z-axis is vertically upward, the XY plane is horizontal, the Y-axis direction is the axis direction of the first cylindrical jigs 21 and 22 and the second cylindrical jigs 23 and 24, and the Z-axis direction is vertical; these are common to all drawings.

[0012] As shown in Figure 1, the bending fatigue testing apparatus 100 comprises a holding section 10, a pair of first cylindrical jigs 21 and 22, a pair of second cylindrical jigs 23 and 24, and C-shaped jigs 3A to 3D. The bending fatigue testing apparatus 100 can perform bending fatigue tests on a first string-like member SM1 and a second string-like member SM2. The diameters of the first string-like member SM1 and the second string-like member SM2 are preferably different. In this embodiment 1, the diameter of the second string-like member SM2 is larger than the diameter of the first string-like member SM1. The first string-like member SM1 is clamped between the pair of first cylindrical jigs 21 and 22, and the axis of the first string-like member SM1, in particular the clamped portion of the first string-like member SM1, extends in the vertical direction. Similarly, the second string-like member SM2 is clamped between a pair of second cylindrical jigs 23 and 24, so that the axis of the second string-like member SM2, in particular the clamped portion of the second string-like member SM2, extends vertically.

[0013] The holding section 10 includes bases 1 to 6. Bases 1 and 2 and bases 3 and 4 are arranged at predetermined intervals. Base 1 and base 3 face each other, and base 2 and base 4 face each other. Bases 1 and base 2 are aligned in a predetermined direction (here, the X-axis direction). Bases 3 and base 4 are aligned in a predetermined direction (here, the X-axis direction). A first region A1 is positioned between bases 1 and 2 and bases 3 and 4.

[0014] The pedestals 3, 4 and the pedestals 5, 6 are arranged at a predetermined interval. The pedestal 3 faces the pedestal 5, and the pedestal 4 faces the pedestal 6. The pedestals 5 and 6 are arranged side by side in a predetermined direction (here, the X-axis direction). A second region A2 is arranged between the pedestals 3, 4 and the pedestals 5, 6.

[0015] The pedestals 1 to 4 hold a pair of first cylindrical jigs 21, 22 in the first region A1. The pedestals 3 to 6 hold a pair of second cylindrical jigs 23, 24 in the second region A2.

[0016] As shown in FIGS. 1 and 2, the pedestal 1 has a key groove 1a. The key groove 1a is provided on the surface of the pedestal 1 that faces the pedestal 3. The cross-sectional shape of the key groove 1a is, for example, a substantially T-shaped that protrudes toward the surface side where the key groove 1a is provided.

[0017] The pedestal 2 has a key groove 2a. The key groove 2a is provided on the surface of the pedestal 2 that faces the pedestal 4. The cross-sectional shape of the key groove 2a is, for example, a substantially T-shaped that protrudes toward the surface side where the key groove 2a is provided. The key grooves 1a and 2a may be arranged side by side in a predetermined direction (here, the X-axis direction).

[0018] The pedestal 3 has key grooves 3a, 3b. The key groove 3a is provided on the surface of the pedestal 3 that faces the pedestal 1. The cross-sectional shape of the key groove 3a is, for example, a substantially T-shaped that protrudes toward the surface side where the key groove 3a is provided. The key groove 3b is provided on the surface of the pedestal 3 that faces the pedestal 5. The cross-sectional shape of the key groove 3b is a substantially T-shaped that protrudes toward the surface side where the key groove 3b is provided.

[0019] The pedestal 4 has key grooves 4a and 4b. The key groove 4a is provided on the surface of the pedestal 4 facing the pedestal 2. The cross-sectional shape of the key groove 4a is, for example, a substantially T-shaped protruding toward the surface side where the key groove 4a is provided. The key grooves 3a and 4a may be continuous in a predetermined direction (here, the X-axis direction). The key groove 4b is provided on the surface of the pedestal 4 facing the pedestal 6. The cross-sectional shape of the key groove 4b is, for example, a substantially T-shaped protruding toward the surface side where the key groove 4b is provided. The key grooves 3b and 4b may be continuous in a predetermined direction (here, the X-axis direction).

[0020] The pedestal 5 has a key groove 5b. The key groove 5b is provided on the surface of the pedestal 5 facing the pedestal 3. The cross-sectional shape of the key groove 5b is, for example, a substantially T-shaped protruding toward the surface side where the key groove 5b is provided.

[0021] The pedestal 6 has a key groove 6b. The key groove 6b is provided on the surface of the pedestal 6 facing the pedestal 4. The cross-sectional shape of the key groove 6b is, for example, a substantially T-shaped protruding toward the surface side where the key groove 6b is provided. The key grooves 5b and 6b may be continuous in a predetermined direction (here, the X-axis direction).

[0022] One end of the first cylindrical jig 21 is inserted into the key groove 1a, and the other end of the first cylindrical jig 21 is inserted into the key groove 3a. One end of the first cylindrical jig 22 is inserted into the key groove 2a, and the other end of the first cylindrical jig 22 is inserted into the key groove 4a. Thereby, the first cylindrical jig 21 is held movably in a predetermined direction (here, the X-axis direction) by the pedestals 1 and 3. The pair of first cylindrical jigs 22 are held movably in the said predetermined direction by the pedestals 2 and 3. The said predetermined direction is a direction perpendicular to the axis of the first string-like member SM1 and the axes of the pair of first cylindrical jigs 21 and 22.

[0023] One end of the second cylindrical jig 23 is inserted into the keyway 3b, and the other end of the second cylindrical jig 23 is inserted into the keyway 5b. One end of the second cylindrical jig 24 is inserted into the keyway 4b, and the other end of the second cylindrical jig 24 is inserted into the keyway 6b. As a result, the second cylindrical jig 23 is held by the bases 3 and 5 so as to be movable in a predetermined direction (here, in the X-axis direction). The second cylindrical jig 24 is held by the bases 4 and 6 so as to be movable in the same predetermined direction. The predetermined direction is perpendicular to the axis of the second string-like member SM2 and the axes of the pair of second cylindrical jigs 23 and 24.

[0024] The radii of the pair of first cylindrical jigs 21 and 22 should be the same as the minimum bending radius of the first string-like member SM1. The pair of first cylindrical jigs 21 and 22 clamp the first string-like member SM1 so that it bends at its minimum bending radius.

[0025] The C-shaped jigs 3A and 3B are inserted from both sides of the second cylindrical jig 23, respectively. As shown in Figures 1 and 3, the C-shaped jigs 3C and 3D are inserted from both sides of the second cylindrical jig 24, respectively. The cross-sectional shape of the C-shaped jigs 3A and 3B is substantially cylindrical, and the radius of this substantially cylindrical shape is preferably the same as the minimum bending radius of the second string-like member SM2. The cross-sectional shape of the C-shaped jigs 3C and 3D is substantially cylindrical, and the radius of this substantially cylindrical shape is preferably the same as the minimum bending radius of the second string-like member SM2. The pair of second cylindrical jigs 23 and 24 are inserted into the C-shaped jigs 3A to 3D, thereby clamping the second string-like member SM2 so that it bends at its minimum bending radius.

[0026] The radii of the pair of second cylindrical jigs 23 and 24 may be the same as, for example, the radii of the pair of first cylindrical jigs 21 and 22. Having the same radius for the pair of first cylindrical jigs 21 and 22 and the pair of second cylindrical jigs 23 and 24 can help reduce the manufacturing costs of the pair of first cylindrical jigs 21 and 22 and the pair of second cylindrical jigs 23 and 24.

[0027] Based on the above, according to the configuration of the bending fatigue testing apparatus 100, the first string-like member SM1 is clamped in the first region A1 so that it bends at the minimum bending radius. Simultaneously with the clamping of the first string-like member SM1, the second string-like member SM2 is clamped so that it bends at the minimum bending radius. In other words, bending fatigue tests can be performed simultaneously on string-like members of different diameters.

[0028] It should be noted that the present invention is not limited to the embodiments described above, and can be modified as appropriate without departing from the spirit of the invention. Furthermore, the present invention may be implemented by combining the above embodiments or examples thereof as appropriate. [Explanation of Symbols]

[0029] 100 Bending fatigue testing apparatus 10 Holding part 1, 2, 3, 4, 5, 6 Pedestal 1a, 2a, 3a, 3b, 4a, 4b, 5b, 6b keyway 21, 22 First cylindrical jig 23, 24 Second cylindrical jig 3A, 3B, 3C, 3D C type jig A1 First area A2 Second area SM1 First string-like member SM2 Second string-like member

Claims

[Claim 1] A pair of first cylindrical jigs for holding the first string-like member so that the first string-like member bends with the minimum bending radius, A pair of second cylindrical jigs for clamping the second string-like member, which has a larger diameter than the first string-like member, so that the second string-like member bends with the minimum bending radius, A holding portion that holds the pair of first cylindrical jigs so as to be movable in a direction perpendicular to the axis of the first string-like member and the axis of the pair of first cylindrical jigs in a first region, and holds the pair of second cylindrical jigs so as to be movable in a direction perpendicular to the axis of the second string-like member and the axis of the pair of second cylindrical jigs in a second region, It comprises four C-shaped jigs that clamp onto both sides of the pair of second cylindrical jigs, The holding portion has a plurality of key grooves into which one end and the other end of the pair of first cylindrical jigs and the pair of second cylindrical jigs are respectively inserted. A bending fatigue testing apparatus for string-like members.

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