JP2000227392A - Torsion/bending combined load-testing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately control a bending moment being applied to a sample, and to accurately carry out a combined load test even in a test where bending deformation is large by providing a four-node link mechanism or the like for composing a quadrangle for interlocking a link member. SOLUTION: Torsion torque is applied to a sample W by rotating a lever member 31 around a support shaft 12 by an actuator 40 for torsion, thus rotating a link member 22 at the side of a non-sample around a pin 14 by a link member 34 for displacing, and rotating a four-node link mechanism 20. In the rotation of the four-node mechanism 20, a parallelogram being demarcated by spherical bearings 23, 24, and 25 is deformed, a link member 21 at the side of the sample is rotated by the same angle as the angle of rotation of the link member 22 at the side of the non-sample. By rotating the link member 21 at the side of the sample, the torsion torque around a center axis is applied to the sample W. Also, bending force is applied to the sample W by rotating a rocking arm 13 by an actuator 45 for bending or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combined torsion / bending load tester, and more particularly to a combined torsion / bending load test for performing a load test on a shaft, such as a propeller shaft of an automobile, on which a torsion load and a bending load act. It is about the machine.

[0002]

2. Description of the Related Art In order to measure the durability and characteristics of a shaft, such as a propeller shaft of an automobile, on which a torsional load and a bending load act, a torsion torque and a bending force are applied to a test piece (shaft). A testing machine for performing a bending composite load test has been conventionally known.

In particular, recently, researches on using a new material such as CFRP for automobile parts have been actively conducted, and a composite load as close as possible to an actual operating load is added to the test piece to obtain characteristics and durability of the test piece. More and more tests are measuring. Non-metallic new materials are different from metallic materials in that they are soft and have large deformation.If a composite load such as a torsional load and a bending load is applied to a specimen made of this type of new material, mutual interference occurs. In order to avoid this, it is necessary to move the actuator that applies each load while following the deformation of the specimen.

FIG. 4 shows a conventional torsion / bending combined load tester. The conventional combined torsion / bending load tester can move up and down by a link mechanism 103 at one end on the base 100, and bearing members 101 and 102 for supporting the specimen W in a state equivalent to the mounted state on the base 100. A torque reaction force receiving member 104 fixedly connected at one end of the specimen W to receive a reaction force of torsional torque acting on the specimen W, and a link mechanism 10 at the other end on the base 100.
5, the torsion actuator 106 fixedly connected to the other end of the specimen W to apply a torsional torque to the specimen W, and attached to the portal structure 107 disposed on the base 100. A bending actuator 108 that applies a vertical bending force to the specimen W between the bearing member 101 and the torque reaction force receiving member 104;
Another bending actuator 109 that is attached to the base 100 and applies a vertical bending force to the specimen W between the bearing member 102 and the torsion actuator 106, and has a torque reaction force receiving member 104 Torque detector 110 is incorporated between the connecting portions of the specimen W and the bending moment detector 11 between the connecting portions of the bending actuators 108 and 109 and the specimen W.
1, 112 are incorporated.

In the torsion / bending combined load tester described above, the specimen W is supported in the same state as the mounted state by the bearing members 101 and 102, and one end of the specimen W is supported by the torque reaction force receiving member 104. With the rotation stopped, the other end of the specimen W is twisted by the torsion actuator 106, whereby the torsional torque given to the specimen W is detected by the torsion torque detector 110, and the torsion torque is supplied by the bending actuators 108 and 109. A radial load is applied to the specimen W by pressing or pulling the specimen W in the radial direction,
Thus, the bending moment applied to the specimen W is detected by the bending moment detectors 111 and 112.

The specimen W is bent and deformed by the bending moment, and the shaft end of the specimen W is vertically displaced. On the other hand, the torque reaction force receiving member 104, the torsional actuator 10
6 is vertically movably supported by the link mechanisms 103 and 105, and thus vertically displaces following the vertical displacement of the end of the specimen W.

[Problems to be solved by the invention]

In the conventional torsion / bending combined load tester as described above, when a radial displacement is applied to the specimen, a bending moment is generated by the inertial mass of the torsion actuator, so that the bending moment applied to the specimen is accurately determined. However, there is a drawback that it is difficult to control the load more accurately, and when the bending deformation is large, an accurate combined load cannot be performed.

[0008] For this reason, the conventional torsion / bending combined load tester as described above has a small bending deformation and its application is limited to a test in a state close to a stationary state.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can accurately control a bending moment applied to a test specimen even in a test in which bending deformation is large, thereby performing an accurate combined load. It is another object of the present invention to provide a combined torsion / bending load tester capable of performing a dynamic excitation test such as an actual wave test.

[0010]

To achieve the above object, a combined torsion / bending load tester according to the present invention is capable of performing a load test on a shaft or the like on which a torsion load and a bending load act. In the combined torsion / bending load tester to be performed, one end of the specimen is fixedly connected, and a fixed unit for receiving a reaction force of the torsional torque acting on the specimen, a specimen side link member, the specimen side link member, A quadrilateral is formed by two non-specimen-side link members arranged in parallel, and two connecting link members that pivotally connect both ends of the non-specimen-side link member and the non-specimen-side link member to each other. A first four-node link mechanism fixedly connected to the other end of the specimen at the center of the body-side link member; and a torsional load for rotating the first four-node link mechanism to apply a torsional torque to the specimen. Grant In which it has a stage, a bending load applying means providing a bending force to the specimen by moving in parallel across the first four bar linkage.

[0011] The combined torsion / bending load tester according to the second aspect of the present invention further includes a swing arm supported to be swingable from a fixed support, and the first four-link mechanism is provided with the first four-bar linkage. A center portion of the specimen side link member is rotatably connected to one end of the swing arm and is supported by the swing arm; and the non-test body side link member, the swing arm, and the swing A second four-node link mechanism is constituted by a lever member concentrically arranged with the arm, and a link member that pivotally connects the non-test object side link member and the lever member. The torsional load applying means is a lever. A torsional actuator for rotating a member to rotate and displace the non-test object side link member about a support point with the swing arm, wherein the bending load applying means fixedly supports the swing arm. With the body Jiten are those constituted by bending actuator for rotating around the.

According to a third aspect of the present invention, there is provided a combined torsion / bending load tester wherein a load detector is provided at an intermediate portion between the two connecting link members.

According to a fourth aspect of the present invention, there is provided a combined torsion / bending load tester, wherein the fixed unit is supported by a fixed support so as to be capable of swinging; A parallelogram formed by a non-specimen-side link member disposed in parallel with the specimen-side link member, and two connecting link members that pivotally connect both ends of the specimen-side link member and the non-specimen-side link member to each other. A central portion of the non-test object side link member is rotatably connected to one end of the swing arm and is supported by the swing arm, and the test sample is provided at a center portion of the test object side link member. A first parallel link mechanism to which the other end is fixedly connected, the non-test body side link member, the swing arm, a lever member concentrically arranged with the swing arm, the non-test body side link member and the lever Pivot with members A second parallel link mechanism with a link member connected to the arm, fixing means for inhibiting rotation of the lever member, and bending for turning the swing arm about a support point with the fixed support. It is constituted by an actuator.

According to a fifth aspect of the present invention, there is provided a combined torsion / bending load tester wherein a load detector is provided at an intermediate portion between the two connecting link members of the fixed unit.

In the torsion / bending combined load tester according to the first aspect of the present invention, the fixed unit fixes one end of the specimen and supplies it to the center of the specimen side link member of the first four-bar linkage. The other end of the specimen is fixedly connected, and the specimen side link member is rotated by rotating the first four-node link mechanism by the torsion load applying means, and a torsional torque is given to the specimen. By moving the entire first four-bar linkage in parallel by the bending load applying means, the specimen side link member moves in parallel, and a bending force is applied to the specimen.

In the combined torsion / bending load tester according to the second aspect of the present invention, the torsion actuator serving as the torsion load applying means rotates the lever member so that the non-test object side link member is connected to the swing arm. And the first four-node link mechanism is rotated to rotate the specimen side link member to apply a torsional torque to the specimen. Separately, a bending actuator serving as a bending load applying means rotates the swing arm about a support point with the fixed support, thereby causing the first four-link mechanism to move under the link motion of the second four-link mechanism. The whole mechanism translates, whereby the specimen side link member translates, and a bending force is applied to the specimen.

In the torsion / bending combined load tester according to the third aspect of the present invention, the first four-link mechanism is constituted by two members.
The load acting on the specimen is measured by the load detectors provided at the intermediate portions of the two connecting link members, and the total value of the measured values of the two load detectors becomes the radial load.

In the torsion / bending combined load tester according to the invention, the bending actuator serving as another bending load applying means in the fixed side unit includes a swing arm of the fixed side unit and a fixed support. Is rotated about the support point of the first parallel link mechanism, the entire first parallel link mechanism moves in parallel under the parallel link movement of the second parallel link mechanism, whereby the specimen side link member moves in parallel and is fixed. A bending force is applied to the specimen in the side unit.

In the torsion / bending combined load tester according to the fifth aspect of the present invention, in the fixed-side unit, load detection is provided at an intermediate portion between two connecting link members constituting the first parallel link mechanism. The load acting on the specimen is measured by the detector, the difference between the measured values of the two load detectors becomes the torsional torque, and the total measured value becomes the radial load.

[0020]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

1 to 3 show an embodiment of a combined torsion / bending load tester according to the present invention.

As shown in FIG. 1, a combined torsion / bending load tester includes a composite load applying unit 10 on a base 1,
And a fixed unit 50. The composite load applying side unit 10 and the fixed side unit 50 are respectively provided so as to be slidable on the base 1 in the left-right direction as viewed in FIG.
Feed screws 4, 5 hand-turned by handles 2, 3
The position in the left-right direction (unit interval) is variably set by (see FIGS. 2 and 3), and is fixed at a position corresponding to the axial length of the specimen W.

On the base 1, bearing members 6, 7 for supporting the specimen W in a state equivalent to the mounted state are fixedly arranged.

As shown in FIG. 2, the composite load applying side unit 10 comprises a fixed support 11 which is fixed on the base 1 as a unit main body, a first four-link mechanism 20, and a second
, A four-bar linkage mechanism 30, a torsion actuator 40 as a torsion load applying means, and a bending actuator 45 as a bending load applying means.

The first four-joint link mechanism 20 includes a specimen-side link member 21 arranged in a flange-like lower side, and a triangular plate-shaped upper-side arrangement arranged in parallel with the specimen-side link member 21. A specimen-side link member 22, and two connecting link members 27 that pivotally connect both ends of the specimen-side link member 21 and the non-test-object-side link member 22 to each other by spherical bearings 23, 24, 25, and 26; A specimen side link member 21 functions as a specimen attachment, and the left end (the other end) of the specimen W is fixedly connected to the left end (the other end) of the specimen W in a flange connection manner by a plurality of bolts 29 at a central portion. . That is, the first four-bar linkage 2
Reference numeral 0 denotes a parallel link mechanism having spherical bearings 23, 24, 25, and 26 as four pivot points.

The fixed support 11 supports a middle portion of the swing arm 13 by a support shaft 12 so as to be able to swing (rotate).
The first four-bar link mechanism 20 includes the non-specimen-side link member 2.
2 is pivotally connected to one end of a swing arm 13 by a pin 14 and is supported by the swing arm 13.

The second four-node link mechanism 30 includes a non-test body side link member 22, a swing arm 13, and a lever member 31 rotatably supported by the support shaft 12 and arranged concentrically with the swing arm 13. And a link member 34 for pivotally connecting the non-specimen-side link member 22 and the lever member 31 by spherical bearings 32 and 33. That is, the second four-link mechanism 30 constitutes a parallel link mechanism having the support shaft 12, the pin 14, and the spherical bearings 32, 33 as four pivot points.

The torsion actuator 40 is composed of a fluid pressure cylinder device attached to the fixed support 11 by a bracket 41, and the tip of the piston rod 42 is drivingly connected to the lever member 31 by a pin 43.
The lever member 31 is driven to rotate about the center axis of the support shaft 12.

The bending actuator 45 is composed of a hydraulic cylinder device attached to the fixed support 11 by a bracket 46, and the tip of the pin rod 47 is drivingly connected to the other end of the swing lever 13 by a pin 48. The swing lever 13 is driven to rotate about the central axis of the support shaft 12.

Load detectors 90 and 91, such as load cells, are provided in the middle of the two connecting link members 27 and 28 of the first four-bar linkage mechanism 20, respectively.

As shown in FIG. 3, the fixed unit 50 comprises a fixed support 51 which forms a unit body and is fixed on the base 1, a first parallel link mechanism 60, and a second parallel link mechanism. 70, and a bending actuator 80 as bending load applying means.

The first parallel link mechanism 60 includes a sample-side link member 61 having a flange-like lower arrangement, and a non-test-piece having a triangular plate-shaped upper arrangement arranged in parallel with the sample-side link member 61. The body-side link member 62 and two connecting link members 67 and 68 for connecting both ends of the specimen-side link member 61 and the non-test body-side link member 62 so as to be pivotable with each other by spherical bearings 63, 64, 65 and 66. , The specimen side link member 61 functions as a specimen attachment, and the right end (one end) of the specimen W is fixedly connected to the right end (one end) of the specimen W by a plurality of bolts 69 at the center. That is, the first parallel link mechanism 6
Numeral 0 constitutes a parallel link mechanism having spherical bearings 63, 64, 65, 66 as four pivot points.

The fixed support 51 supports a middle portion of a swing arm 53 by a support shaft 52 so as to be able to swing (rotate).
The first parallel link mechanism 60 includes the non-specimen-side link member 6.
2 is pivotally connected to one end of a swing arm 53 by a pin 54, and is supported by the swing arm 53.

The second parallel link mechanism 70 includes a non-test body side link member 62, a swing arm 53, and a lever member 71 rotatably supported by the support shaft 52 and arranged concentrically with the swing arm 53. And a link member 74 for pivotally connecting the non-test object side link member 62 and the lever member 71 by spherical bearings 72 and 73. The second parallel link mechanism 70 includes a support shaft 52, a pin 54, and a spherical bearing 7.
A parallel link mechanism having two pivot points 2, 73 is formed.

The lever member 7 of the second parallel link mechanism 70
1 is a fixed rod 7 having one end fixed to a fixed support 51.
5 is connected to the other end by a pin 76, and is in a non-rotatable fixed state. That is, the fixing rod 75 serves as fixing means for inhibiting the rotation of the lever member 71.

The bending actuator 80 is composed of a fluid pressure cylinder device attached to the fixed support 51 by a bracket 81, and the tip of the pin rod 82 is drivingly connected to the other end of the swing lever 53 by a pin 83. The swing lever 53 is driven to rotate about the center axis of the support shaft 52.

At the intermediate portion between the two connecting link members 67 and 68 of the first parallel link mechanism 60, load detectors 92 and 93 are respectively provided by load cells or the like.

The components of the composite load applying unit 10 and the fixed unit 50 are shared, and the difference between the composite load applying unit 10 and the fixed unit 50 is that The lever member 31 of the fixed side unit 50 is rotated while the lever member 31 of the fixed side unit 50 is driven and connected to the torsional actuator 40.
Are fixed to the rotation prohibition state by the fixing rod 75.

The fact that the lever member 71 is in the rotation prohibition state means that the specimen side link member 61 is in the rotation prohibition state, and the torsion that the specimen side link member 61 acts on the specimen W. Receive the reaction force of torque.

Next, the operation of the combined torsion / bending load tester having the above configuration will be described.

The torsion torque is applied to the specimen W by rotating the lever member 31 about the center axis of the support shaft 12 by the torsion actuator 40.

When the lever member 31 rotates about the center axis of the support shaft 12, the link member 34 causes the non-test specimen side link member 22 to rotate and displace about the center axis of the pin 14,
The first four-link mechanism 20 rotates.

The rotation of the first four-bar linkage 20 means that the parallelogram defined by the four pivot points of the spherical bearings 23, 24, 25, and 26 is deformed. The member 21 rotates by the same angle as the rotation angle of the non-test object side link member 22. The rotation of the specimen side link member 21 gives the specimen W a torsional torque around its own central axis.

At this time, the torsional torque is
0 of the first parallel link mechanism 60 and the load detector 93 provided at the intermediate portion of the other connecting link member 68. And is used for feedback control of the torsional actuator 40.

The bending force is applied to the specimen W by the bending arms 45, 80.
3 is rotated around the center axis of the support shafts 12, 52.

When the swing arm 13 rotates about the center axis of the support shaft 12, the entire first four-joint link mechanism 20 moves under the parallel link motion of the second four-joint link mechanism 30 to move its parallel Translates up and down without deforming the shape of the shape.

As a result, the specimen side link member 21 moves up and down in parallel, and a bending force is applied to the left end side of the specimen W.

At this time, the radial load acting on the left end side of the specimen W is detected by the load detector 90 provided at the intermediate portion of the connecting link member 27 of the first four-link mechanism 20 of the composite load applying unit 10. And a load detector 91 provided at an intermediate portion of the other connecting link member 28.
And is used for feedback control of the bending actuator 45.

When the swing arm 53 rotates about the center axis of the support shaft 52, the entire first parallel link mechanism 60 is moved under the parallel link motion of the second parallel link mechanism 70 so that its parallel Translates up and down without deforming the shape of the shape.

As a result, the specimen side link member 61 moves up and down in parallel, and a bending force is applied to the right end side of the specimen W.

At this time, the radial load acting on the right end side of the specimen W is measured by a load detector 92 provided at an intermediate portion of the connecting link member 67 of the first parallel link mechanism 60 of the fixed unit 50. And a measurement value of a load detector 93 provided at an intermediate portion of the other connecting link member 68.
Used for feedback control.

As described above, when the torsional torque is applied, the non-test specimen side link member 22 rotates about the pin 14 at the tip of the swing lever 13, and when the bending force is applied, the swing lever 13 is moved to the support shaft 12. Rotate around. Here, the second four-bar linkage 30 includes a support shaft 12 and a pin 14.
And the spherical bearings 32 and 33 constitute a parallel link mechanism having four pivot points.
The rotation of the pivot lever 13 about the support shaft 12 and the rotation of the swing lever 13 about the support shaft 12 do not interfere with each other, and are independently driven by the torsional actuator 40 and the bending actuator 45, respectively. Power is transmitted.

Thus, even if a large bending deformation occurs in the specimen W, the second four-link mechanism 30 operates only with low resistance, and no bending moment is generated by the inertial mass of the torsional actuator 40. The bending moment applied to the specimen W can be controlled accurately. Therefore, a composite load having a large bending deformation can be accurately performed.

The connecting link members 27 and 28 and the test piece side link member 21 as the test piece attachment, and the connecting link members 67 and 68 and the test piece side link member 61 as the test piece attachment can have a lightweight structure. Therefore, the mass of the moving part from each of the load detectors 90, 91, 92, 93 to the specimen W can be reduced, and the load detector 90,
The resonance frequencies of the rigidity of 91, 92 and 93 and the mass of the moving part can be set high.

As a result, it is possible to vibrate up to a high frequency, and a dynamic vibration test such as a real wave test becomes possible.

[0056]

As will be understood from the above description, according to the combined torsion / bending load tester according to the first aspect of the present invention, a load test for a shaft or the like on which a torsion load and a bending load act. A fixed-side unit fixedly connected at one end of a specimen and receiving a reaction force of a torsional torque acting on the specimen, a specimen-side link member, and the specimen-side link member. A non-specimen-side link member arranged in parallel with the first link member, and two connecting link members for pivotally connecting both ends of the non-specimen-side link member and the non-specimen-side link member to form a quadrilateral. A first four-node link mechanism in which the other end of the specimen is fixedly connected at the center of the specimen side link member; and a torsion for rotating the first four-node link mechanism to apply a torsional torque to the specimen. A load applying means, and shall first four-bar by linkage whole is translated and a bending load applying means providing a bending force to the specimen.

For this reason, the fixed side unit fixes one end of the specimen, the other end of the specimen is fixedly connected to the center of the specimen side link member of the first four-bar linkage, and the torsional load applying means is used. By rotating the first four-link mechanism, the specimen side link member is rotated to apply a torsional torque to the specimen, and separately from this, the entire first four-link mechanism is parallelized by bending load applying means. By moving the specimen, the specimen side link member is moved in parallel to apply a bending force to the specimen, whereby torsional torque and bending force can be applied to the specimen without interfering with each other. Therefore, even in a test in which bending deformation is large, it is possible to accurately control the bending moment applied to the specimen and to perform an accurate combined load.

According to the torsion / bending combined load tester according to the second aspect of the present invention, the parallel link mechanism further includes a swing arm supported to be swingable from a fixed support. The central portion of the body side link member is rotatably connected to one end of the swing arm and is supported by the swing arm, and is arranged concentrically with the non-test body side link member, the swing arm, and the swing arm. A second four-node link mechanism is constituted by the lever member, the link member that pivotally connects the non-test object side link member and the lever member, and the torsional load applying unit rotates the lever member. The bending load applying means is configured to rotate the non-specimen side link member about a support point with the swing arm, and the bending load applying means moves the swing arm around the support point with the fixed support. It was assumed to be constituted by an actuator for rotating and.

For this reason, when the torsional actuator rotates the lever member, the non-test specimen side link member is rotated and displaced about the support point with the swing arm, whereby the first four-link mechanism is rotated. By rotating, a torsional torque is applied to the specimen, and separately from this, the bending actuator rotates the swing arm about the support point with the fixed support, thereby forming the parallel link of the second four-bar linkage. A bending force can be applied to the specimen by the entire first four-bar linkage moving in parallel under the motion, whereby torsional torque and bending force can be applied to the specimen without interfering with each other. it can. Therefore, even in a test in which bending deformation is large, it is possible to accurately control the bending moment applied to the specimen and to perform an accurate combined load.

According to the torsion / bending combined load tester according to the third aspect of the present invention, the load detector is provided at an intermediate portion between the two connecting link members constituting the first four-link mechanism. I said

For this reason, the load applied to the specimen is measured by the load detectors provided at the intermediate portions of the two connecting link members constituting the first four-link mechanism.
The radial load can be measured from the sum of the measured values of the two load detectors. With this structure, the connecting link member and the specimen side link member, which is the specimen attachment, can be made lightweight, so that the moving part mass from the load detector to the specimen can be reduced, and the rigidity and movement of the load detector can be reduced. The resonance frequency with the mass can be set higher. As a result, it is possible to vibrate up to a high frequency, and a dynamic vibration test such as an actual wave test becomes possible.

According to the torsional / bending combined load tester according to the fourth aspect of the present invention, the fixed unit is a swing arm supported so as to be able to swing from a fixed support, a specimen side link member, A non-specimen-side link member disposed in parallel with the specimen-side link member, and two non-specimen-side link members are connected in parallel by two connecting link members that pivotally connect both ends of the specimen-side link member and the non-specimen-side link member. Forming a quadrilateral, a central portion of the non-test body side link member is rotatably connected to one end of the swing arm and supported by the swing arm,
A first parallel link mechanism fixedly connected to the other end of the specimen at the center of the specimen side link member; and a non-specimen side link member, the swing arm, and a concentric arrangement with the swing arm. A second parallel link mechanism including a lever member, a link member that pivotally connects the non-test object side link member and the lever member, a fixing unit that inhibits rotation of the lever member, and the swinging motion. The arm is constituted by a bending actuator for rotating the arm about a support point with the fixed support.

For this reason, in the fixed side unit, the bending actuator rotates the swing arm of the fixed side unit about the supporting point with the fixed support so that the bending arm can move under the parallel link motion of the second parallel link mechanism. In addition, the entire first parallel link mechanism moves in parallel, so that a bending force can be applied to the specimen even in the fixed-side unit, and various torsion / bending combined load tests can be performed.

According to a combined torsion / bending load tester according to the fifth aspect of the present invention, a load detector is provided at an intermediate portion between the two connecting link members of the fixed unit. .

Therefore, in the fixed unit, the first
The load acting on the specimen is measured by the load detectors provided at the intermediate portions of the two connecting link members constituting the parallel link mechanism, and the torsion is calculated from the difference between the measured values of the two load detectors. The torque can be measured, and the radial load can be measured from the sum of the measured values of the two load detectors. With this structure, the connecting link member and the specimen side link member, which is the specimen attachment, can be made lightweight, so that the moving part mass from the load detector to the specimen can be reduced, and the rigidity and movement of the load detector can be reduced. The resonance frequency with the mass can be set higher. As a result, it is possible to vibrate up to a high frequency, and a dynamic vibration test such as an actual wave test becomes possible.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of a combined torsion / bending load tester according to the present invention.

FIG. 2 is a left side view showing one embodiment of a combined torsion / bending load tester according to the present invention.

FIG. 3 is a right side view showing one embodiment of the combined torsion / bending load tester according to the present invention.

FIG. 4 is a perspective view showing a conventional combined torsion / bending load test machine.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 base 10 composite load applying side unit 50 fixed side unit 11 fixed support 12 support shaft 13 swing arm 20 first four-node link mechanism 22 non-test sample side link member 21 test sample side link member 27, 28 connecting link Member 30 Second Four-Bar Link Mechanism 31 Lever Member 34 Link Member 40 Torsion Actuator 45 Bending Actuator 51 Fixed Support 52 Support Shaft 53 Swing Arm 60 First Parallel Link Mechanism 61 Specimen-Side Link Member 62 Not Provided Sample side link member 67, 68 Connecting link member 70 Second parallel link mechanism 71 Lever member 74 Link member 75 Fixed rod 80 Bending actuator 90, 91, 92, 93 Load detector

Claims (5)

[Claims] 1. A torsion / bending combined load tester for performing a load test on a shaft or the like on which a torsion load and a bending load act, wherein one end of a specimen is fixedly connected and a reaction force of a torsional torque acting on the specimen. A fixed-side unit for receiving the test-piece-side link member, a non-test-piece-side link member arranged in parallel with the test-piece-side link member, and both ends of the test-piece-side link member and the non-test-piece-side link member. A first four-node link mechanism that forms a quadrilateral by two connecting link members that are pivotally connected, and that is fixedly connected to the other end of the specimen at the center of the specimen-side link member; (1) a torsion load applying means for rotating the four-bar linkage to apply a torsional torque to the specimen; and a bending load for imparting a bending force to the specimen by moving the entire first four-bar linkage in parallel. Torsional Bending multifunction load test machine, characterized in that it comprises a means. 2. A swing arm supported by a fixed support so as to be swingable, wherein the first four-node link mechanism has a center portion of the non-test body side link member at one end of the swing arm. The non-test body side link member, the swing arm, a lever member concentrically arranged with the swing arm, and the non-test body side link member are rotatably connected and supported by the swing arm. A second four-node link mechanism is constituted by a link member that pivotally connects the lever member to the lever member, and the torsional load applying unit rotates the lever member to swing the non-test specimen side link member. The bending load applying means comprises a bending actuator for rotating the swing arm about a support point with the fixed support. Torsional Bending multifunction load test machine according to claim 1, wherein in that, it is. 3. The combined torsion / bending load test machine according to claim 1, wherein a load detector is provided at an intermediate portion between the two connecting link members. 4. The fixed unit includes: a swing arm that is swingably supported by a fixed support; a specimen side link member; and a non-sample side link disposed in parallel with the specimen side link member. A parallelogram is formed by two connecting link members that pivotally connect both ends of the member and the specimen side link member and the non-test body side link member to each other, and a central portion of the non-test body side link member is formed. A first parallel link mechanism rotatably connected to one end of the swing arm, supported by the swing arm, and fixedly connected to the other end of the specimen at the center of the specimen side link member; The non-test piece side link member, the swing arm, a lever member concentrically arranged with the swing arm, and a link member that pivotally connects the non-test piece side link member and the lever member. And the second flat A row link mechanism, fixing means for inhibiting rotation of the lever member, and a bending actuator for rotating the swing arm about a support point of the fixed support. The torsion according to claim 1, 2 or 3,
Bending composite load tester. 5. The combined torsion / bending load test machine according to claim 4, wherein a load detector is provided at an intermediate portion between the two connecting link members of the fixed unit.