JP-2026074690-A - Bending fatigue testing apparatus for string-like members

JP2026074690AJP 2026074690 AJP2026074690 AJP 2026074690AJP-2026074690-A

Abstract

[Problem] To provide a bending fatigue testing apparatus for string-like members that can perform bending fatigue tests on string-like members of different diameters simultaneously. [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. [Selection Diagram] Figure 1

Inventors

高坂博宣

Assignees

トヨタ自動車株式会社

Dates

Publication Date: 20260507
Application Date: 20241021

Claims (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.

Description

This disclosure relates to a bending fatigue testing apparatus for string-like members. The cable bending jig disclosed in Patent Document 1 comprises a pair of clamping parts and a bending reference member. The pair of clamping parts are formed to be flexible, 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, when the cable is bent together with the clamping parts, abuts against the clamping parts to restrict the bending of the clamping parts. The cable bending jig is suitable for bending tests in which the cable is bent multiple times or bent in opposite directions. Japanese Patent Publication No. 2013-005686 This is a schematic diagram showing a bending fatigue testing apparatus according to Embodiment 1.This is a schematic cross-sectional view of the main part of the bending fatigue testing apparatus along the cutting line II-II in Figure 1.This is a schematic cross-sectional view of the main part of the bending fatigue testing apparatus along the cutting line III-III in Figure 1. The following describes specific embodiments of the present invention in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. Furthermore, for clarity, the following description and drawings have been simplified as appropriate. <Embodiment 1> Embodiment 1 will be described with reference to Figures 1 to 3. 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 coordinate systems are common across drawings. 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. It is preferable that the diameters of the first string-like member SM1 and the second string-like member SM2 are 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, particularly the clamped portion of the second string-like member SM2, extends vertically. The holding section 10 comprises bases 1 to 6. Bases 1 and 2 and bases 3 and 4 are arranged at predetermined intervals. Bases 1 and 3 face each other, and bases 2 and 4 face each other. Bases 1 and 2 are aligned in a predetermined direction (here, the X-axis direction). Bases 3 and 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. Bases 3 and 4 and bases 5 and 6 are arranged at predetermined intervals. Base 3 and base 5 face each other, and base 4 and base 6 face each other. Bases 5 and 6 are aligned in a predetermined direction (in this case, the X-axis direction). A second region A2 is positioned between bases 3 and 4 and bases 5 and 6. Bases 1-4 hold a pair of first cylindrical jigs 21 and 22 in the first region A1. Bases 3-6 hold a pair of second cylindrical jigs 23 and 24 in the second region A2. As shown in Figures 1 and 2, the base 1 has a keyway 1a. The keyway 1a is provided on the surface of the base 1 facing the base 3. The cross-sectional shape of the keyway 1a is, for example, a roughly T-shape, projecting toward the surface where the keyway 1a is provided. The base 2 has a keyway 2a. The keyway 2a is provided on the surface of the base 2 facing the base 4. The cross-sectional shape of the keyway 2a is, for example, a roughly T-shape, projecting toward the surface where the keyway 2a is provided. The keyways 1a and 2a may be connected in a predetermined direction (in this case, the X-axis direction). The base 3 has keyways 3a and 3b. Keyway 3a is provided on the surface of the base 3 facing the base 1. The cross-sectional shape of keyway 3a is, for example, a roughly T-shape, projecting toward the surface where the keyway 3a is provided. Keyway 3b is provided on the surface of the base 3 facing the base 5. The cross-sectional shape of keyway 3b is a roughly T-shape, projecting tow