JP4574691B2 - Torque load test equipment - Google Patents

Description

  The present invention relates to a torque load test apparatus capable of applying a load torque to a specimen that is a test object attached to a test shaft.

A conventional torque load test apparatus is described in Patent Document 1, for example. In this conventional example, the drive shaft 02 is rotated by the drive motor 01 as shown in FIG. The drive shaft 02 is provided with a drive shaft first gear 03 and a drive shaft second gear 04. These gears 03 and 04 are the test shaft first gear of the test shaft 011 via the intermediate gears 06 and 07. 012 and the test second shaft gear 013. A specimen 016 that is a test object such as a vehicle shaft or a constant velocity joint is attached to the test shaft 011. When the drive shaft 02 is operated, the specimen 016 rotates through the gear mechanism. The drive shaft 02 is provided with a rotary actuator 017. The rotary actuator 017 rotates the drive shaft second gear 04 relative to the drive shaft first gear 03 to generate torque. Yes. The torque of the rotary actuator 017 is transmitted to the rotating specimen 016 via the gear mechanism, and a torsional torque is applied to the specimen 016.
Japanese Patent Laid-Open No. 55-20415

  Since the meshing gears have backlash (gap between the meshing gear teeth), when the rotation of the drive motor 01 is transmitted, for example, the gears 03 and 04 of the drive shaft 02 As shown in FIG. 9A, torque is transmitted from the drive shaft 02 to the intermediate gears 06 and 07 while the teeth abut on the teeth on the advance side of the intermediate gears 06 and 07. Further, when torque is applied by the rotary actuator 017, one of the gears 03 and 04 of the drive shaft 02 comes into contact with the teeth on the advance side of the intermediate gears 06 and 07, and the other is shown in FIG. 9B. The intermediate gears 06 and 07 are in contact with the teeth on the delay side, and the intermediate gear 06 and the intermediate gear 07 are loaded with torques in opposite directions. This torque is transmitted to the test shaft first gear 012 and the test shaft second gear 013, and the test shaft first gear 012 and the test shaft second gear 013 of the test shaft 011 rotate in directions opposite to each other. An attempt is made to apply a torsional torque to the specimen 016 attached to the test shaft 011. In this way, torque from the rotary actuator 017 is transmitted to the test shaft 011 via the gear mechanisms 03, 04, 06, 07, 012 and 013.

  By the way, there is a case where it is desired to load the specimen 016 with an alternating torque in which the direction of the torque changes alternately. In such a case, for example, when one of the gears 03 and 04 of the drive shaft 02 that has been in contact with the forward teeth of the intermediate gears 06 and 07 changes the direction of the torque, the intermediate gears 06 and 07 are used. It contacts the delayed tooth. This switching of the contacting teeth occurs every time the direction of torque changes. Then, during this switching, a period in which the gears 03 and 04 do not contact the teeth of the intermediate gears 06 and 07, that is, a period in which the torque is 0, occurs, and as shown in FIG. The waveform is not smooth, and a flat portion is generated near the point where the torque is 0, resulting in distortion. In this way, for example, one of the gears 03 and 04 of the drive shaft 02 that has been in contact with the teeth on the advance side of the intermediate gears 06 and 07 rotates and contacts with the teeth on the delay side of the intermediate gears 06 and 07. The gap (gap) required until this is called backlash as described above. In this way, the gear has backlash, and when the abutting tooth is switched, the alternating torque waveform is distorted as described above, and the tooth of the gear meshing when the abutting tooth is switched is also as described above. Since each other collides and an impact force is applied, the durability of the gear is lowered.

  The problem to be solved is that in the torque load test apparatus that can apply load torque to the specimen, when alternating torque is applied to the specimen, the torque waveform is not smooth but distorted, and the durability of the gear Is a low point.

The torque load test apparatus of the present invention can apply load torque to the specimen (17). The torque load test device is driven to rotate by a drive device for rotation (2), and includes a drive shaft (1) having a drive shaft first gear (6) and a drive shaft second gear (7), and a drive shaft. A test shaft first gear (12) meshing with the first gear, a test shaft second gear (13) meshing with the drive shaft second gear, a specimen mounting portion (18) to which the specimen is detachably mounted, and A test shaft (11) provided with a torque load device for a specimen (14) for applying a load torque to the specimen attached to the specimen mounting portion, and an outer shaft first gear (in mesh with the test shaft first gear) 22) an outer shaft second gear (23) meshing with the test shaft second gear, and a pre-torque setting device for setting the pre-torque by rotating the outer shaft second gear relative to the outer shaft first gear. Provided with outer shaft (21) with (24) To have. And the drive shaft first gear, the test shaft first gear, the outer shaft first gear, the outer shaft axis, the outer shaft second gear, the test shaft second gear, the drive shaft second gear, and the drive shaft shaft The core is arranged in a closed loop without the specimen being mounted , and the pre-torque setting device makes the outer shaft second gear or drive shaft second gear relative to the outer shaft first gear or drive shaft first gear. Even if the torque load device for the specimen generates an alternating torque in which the direction of the torque alternates, the back of the closed-loop gear mechanism is rotated. The effect of rush can be eliminated .

  In addition, a pre-torque setting device may be provided on the drive shaft.

  Further, two or more test shafts are arranged between the drive shaft and the outer shaft, and the test shaft first gears and the test shaft second gears mesh with each other in the adjacent test shafts. Sometimes.

The pre-torque setting device may be configured by a differential reduction gear that can rotate together with the case (31).
In addition, the torque load device for a specimen may generate an alternating torque in which the direction of torque changes alternately.

  Furthermore, a torque load device for a specimen for applying a load torque to the specimen attached to the specimen attachment portion is disposed on any one of the drive shaft, the test shaft, and the outer shaft, and the drive shaft first gear The test shaft first gear, the outer shaft first gear, the outer shaft axis, the outer shaft second gear, the test shaft second gear, the drive shaft second gear, and the drive shaft axis are arranged in a closed loop. In some cases, the meshing teeth of the closed-loop gear mechanism are brought into close contact with each other to eliminate the influence of backlash of the closed-loop gear mechanism.

  According to the present invention, in addition to the test shaft to which the specimen is attached and the drive shaft for rotationally driving the test shaft, the outer shaft is disposed, and the outer shaft is closed loop by the drive shaft and the gear mechanism. The pre-torque setting device is provided on at least one of the drive shaft and the outer shaft. Even if the pre-torque is set to the closed-loop gear mechanism with this pre-torque setting device and the alternating torque is applied to the test shaft, The torsional torque of the drive shaft and the outer shaft is prevented from becoming zero. As a result, the influence of backlash can be prevented, and the waveform of torque applied to the specimen can be changed smoothly.

  In a torque load test apparatus capable of applying load torque to a specimen, even if alternating torque is applied to the specimen, the torque waveform can be changed smoothly and the durability of the gear can be improved. For this purpose, in addition to the test shaft to which the specimen is attached and the drive shaft for rotationally driving the test shaft, an outer shaft arranged in a closed loop with the drive shaft and the gear mechanism is provided. This is realized by providing a pre-torque setting device on at least one of the shaft and the drive shaft, setting the pre-torque in the closed-loop gear mechanism with this pre-torque setting device, and eliminating the influence of backlash of the closed-loop gear mechanism.

  Next, a first embodiment of the torque load test apparatus according to the present invention will be described with reference to FIGS. FIG. 1 is an example of a schematic conceptual diagram of a first embodiment of a torque load test apparatus according to the present invention. FIG. 2 is an example of a conceptual diagram of the pre-torque setting device after the pre-torque setting. FIG. 3 is a conceptual diagram of the pre-torque setting device before the pre-torque setting. FIG. 4 is an explanatory diagram for explaining the meshing of gear teeth. FIG. 5 is an explanatory diagram for explaining the torque and the like during the test. 1 and 5 are shown as viewed from above when the respective axes are arranged in the horizontal direction, and FIGS. 2 and 3 are illustrated as viewed from the side (lower side in FIG. 1). ing. Of course, it goes without saying that the axes may be arranged in the vertical direction.

  In FIG. 1, a drive shaft 1 is rotationally driven by an electric motor 2 (reference numeral: MOTOR in the figure) which is a rotation drive device. A drive shaft first gear 6 and a drive shaft second gear 7 are fixedly attached to the shaft body of the drive shaft 1, and the gears 6 and 7 rotate together with the shaft body of the drive shaft 1.

  The test shaft 11 includes a test shaft first gear 12 that meshes with the drive shaft first gear 6, a test shaft second gear 13 that meshes with the drive shaft second gear 7, and a hydraulic rotary that is a torque load device for a specimen. An actuator 14 (reference numeral in the figure: R / A), a torque sensor 16 (reference numeral in the figure: T / C), and a specimen attachment portion 18 to which a specimen 17 (reference numeral in the figure: T / P) is detachably attached are provided. is doing. The test shaft first gear 12 is fixed to a cylindrical outer shaft 12a. The shaft body (inner shaft) of the test shaft 11 passes through the internal space of the outer shaft 12a, and the test shaft first gear 12 is rotatable with respect to the shaft body of the test shaft 11. . A rotary actuator 14 is attached to the end of the shaft body of the test shaft 11 and the outer shaft 12a. The main body of the rotary actuator 14 is fixed to the outer shaft 12 a and rotates integrally with the test shaft first gear 12. Then, the rotary actuator 14 rotates the shaft body of the test shaft 11 connected to the output shaft of the rotary actuator 14 with respect to the outer shaft 12a by the supplied hydraulic pressure. One end of the specimen 17 is connected to the output shaft of the rotary actuator 14 via the torque sensor 16 and the like, and rotates integrally. The other end is connected to the test shaft second gear 13 and rotates together. . At this time, if it is assumed that the test shaft first gear 12 and the test shaft second gear 13 are stopped or synchronized (not relatively displaced), the rotation of the output shaft of the rotary actuator 14 causes the specimen to be tested. Torsion torque is applied to 17. A torque sensor 16 provided on the shaft body of the test shaft 11 detects a load torque applied to the specimen 17. In this way, the main body of the rotary actuator 14 is rotated synchronously with the test shaft first gear 12, the output shaft is connected to one end of the specimen 17, and the other end of the specimen 17 is connected to the test shaft second gear 13. Rotate synchronously. Then, when the hydraulic pressure is supplied to the rotary actuator 14 and driven to rotate the output shaft, a torsional torque is applied to the specimen 17.

  The outer shaft 21 includes an outer shaft first gear 22 that meshes with the test shaft first gear 12, an outer shaft second gear 23 that meshes with the test shaft second gear 13, and a pre-torque setting device 24. The outer shaft first gear 22 is fixed to a cylindrical outer shaft 22a. The shaft body (inner shaft) of the outer shaft 21 passes through the inner space of the outer shaft 22a, and the outer shaft first gear 22 is rotatable with respect to the shaft body of the outer shaft 21. The outer shaft second gear 23 is fixedly attached to the shaft body of the outer shaft 21. The pre-torque setting device 24 rotates the outer shaft second gear 23 relative to the outer shaft first gear 22. Then, the drive shaft first gear 6, the test shaft first gear 12, the outer shaft first gear 22, the axial center of the outer shaft 21, the outer shaft second gear 23, the test shaft second gear 13, the drive shaft second The shafts of the gear 7 and the drive shaft 1 are arranged in a closed loop. The gears 6, 7, 12, 13, 22, and 23 are formed of cylindrical gears such as helical gears and spur gears. The rotation arrows in FIG. 1 indicate the rotation direction by the electric motor 2 and the rotation direction of each axis. Of course, it is also possible to rotate in reverse.

  2 and 3, the pre-torque setting device 24, which is a differential mechanism, is composed of a planetary gear mechanism as a differential speed reducer, and includes a first gear 26, a second gear 27, a third gear 28, and a fourth gear. A gear 29, a cylindrical case 31 covering these gears 26 to 29, a case flange 32, an input shaft 33 protruding outward from the case 31, and an input shaft flange 34 provided on the input shaft 33 are provided. Yes. The input shaft 33 of the pre-torque setting device 24 protrudes as an output shaft of the pre-torque setting device 24 from the other end of the case 31 (an end on the attachment portion side of the pre-torque setting device 24), and is connected to the shaft body of the outer shaft 21. Rotate together. The disk-shaped input shaft flange 34 is fixed to the input shaft 33 and rotates integrally therewith, and splines (many grooves) are formed on the outer peripheral surface thereof.

  The first gear 26 is a large gear, and its shaft has a cylindrical shape. The first gear 26 is connected to the outer shaft 22a of the cylindrical outer shaft first gear 22 and rotates integrally with the outer shaft 22a. The case 31 is rotatable about the axis of the outer shaft 22 a of the outer shaft first gear 22. The second gear 27 meshes with the first gear 26 and is a small gear having a smaller diameter than the first gear 26. The third gear 28 is a large gear having a larger diameter than the second gear 27 and the fourth gear 29, and meshes with the fourth gear 29. The second gear 27 and the third gear 28 are fixed to a shaft body rotatably supported by the case 31, and rotate together with the outer shaft 22a when the case 31 rotates. Revolves around the axis of The fourth gear 29 is a small gear that is fixed to the input shaft 33 and rotates integrally. The disc-shaped case flange 32 is provided at the end of the case 31 and rotates integrally with the main body of the case 31, and a spline is formed on the outer peripheral surface in the same manner as the input shaft flange 34.

  The cylindrical coupling 36 that is detachably fitted to the input shaft flange 34 and the case flange 32 has a spline formed on the inner peripheral surface thereof. When the coupling 36 is fitted to the input shaft flange 34 and the case flange 32, the case flange 32 cannot rotate with respect to the input shaft flange 34, and the case 31 has the input shaft 33, the shaft body of the outer shaft 21, and the outer shaft. It rotates integrally with the second gear 23. Further, since the case 31 rotates integrally with the input shaft 33, the second gear 27 and the third gear 28 revolve integrally with the case 31, but do not rotate. The first gear 26 meshed with the revolving second gear 27 rotates as the second gear 27 revolves. As a result, the first gear 26 and the outer shaft first gear 22 rotate together with the input shaft 33 and the shaft body of the outer shaft 21.

  Moreover, the fixing device 41 which makes the case 31 non-rotatable with respect to the installation surface where the torque load test apparatus is installed is provided. When the coupling device 36 is removed from the input shaft flange 34 and the case flange 32 and the input shaft 33 is rotated while the fixing device 41 is fixing the case 31, the gear mechanisms of the gears 26 to 29 of the pre-torque setting device 24 The input shaft 33 and the outer shaft first gear 22 are differentiated, and the outer shaft first gear 22 rotates at a rotation angle smaller than the rotation angle of the input shaft 33 (that is, the rotation angle of the outer shaft second gear 23). . Therefore, the outer shaft second gear 23 is angularly displaced (phase displaced) relative to the outer shaft first gear 22 to set the pre-torque.

With the torque load test apparatus configured as described above, a test is performed in which an alternating torque is applied while rotating a specimen 17 such as a vehicle shaft or a constant velocity joint.
In this test, first, the electric motor 2 and the rotary actuator 14 are stopped, and the specimen 17 is removed from the specimen mounting portion 18. Then, as shown in FIG. 3, the coupling 36 of the pre-torque setting device 24 is removed from the case flange 32 and the input shaft flange 34. Further, the fixing device 41 is fixed with bolts 42 so that the case 31 cannot be rotated.

  Next, the input shaft 33 is rotated as shown by the arrow r1 in FIG. 4 to rotate the outer shaft second gear 23 differentially, that is, relatively with respect to the outer shaft first gear 22. That is, as the input shaft 33 rotates, the outer shaft second gear 23 rotates in the same arrow r1 direction as the input shaft 33, while the outer shaft first gear 22 rotates in the same arrow r1 direction as the input shaft 33. Rotate at an angle smaller than the rotation angle of the input shaft 33. When the outer shaft second gear 23 rotates in the arrow r1 direction, the test shaft second gear 13 that meshes with the outer shaft second gear 23 rotates in the arrow r2 direction. When the test shaft second gear 13 rotates in the arrow r2 direction, the drive shaft second gear 7 meshed with the test shaft second gear 13 rotates in the arrow r3 direction. Since the drive shaft first gear 6 is fixed to the drive shaft 1 together with the drive shaft second gear 7, it rotates in the direction of the arrow r3 in synchronization with the drive shaft second gear 7. In this manner, when the drive shaft first gear 6 rotates in the direction of the arrow r3, the test shaft first gear 12 that meshes with the drive shaft first gear 6 rotates in the direction of the arrow r4. As described above, since the outer shaft second gear 23 and the outer shaft first gear 22 are differential, the gaps that existed in the meshing of the gear mechanism are gradually reduced, and the teeth of the meshing gears become smaller. Adheres closely to each other, eliminating the effect of gaps between gears (backlash). Then, the outer shaft second gear 23 and the test shaft second gear 13 mesh, the test shaft second gear 13 and the drive shaft second gear 7 mesh, the drive shaft first gear 6 and the test shaft first gear 12. And the meshing between the test shaft first gear 12 and the outer shaft first gear 22 are K1, K2, K3, and K4 as viewed from the side (the lower side in FIG. 4). Even if the input shaft 33 is rotated in the direction opposite to the arrow r1, the backlash can be removed although the direction is different.

  If the input shaft 33 is further rotated in the direction of the arrow r1 in a state where the influence of the backlash is removed (that is, the teeth of the meshing gears are in close contact), the torsional torque is applied to the outer shaft 21 and the drive shaft 1. Pre-torques t1 and t2 are generated. When the pre-torques t1 and t2 have the desired magnitudes, as shown in FIG. 2, the coupling 36 is fitted to the case flange 32 and the input shaft flange 34 so that the input shaft flange 34 is relative to the case flange 32. Fix so that it does not rotate. Further, the bolt 42 is removed to release the fixing of the fixing device 41 so that the case 31 of the pre-torque setting device 24 can be rotated.

Next, the specimen 17 is attached to the specimen attachment portion 18 and the test is performed.
In the test, the electric motor 2 is rotated in a fixed direction (R1 direction in FIG. 5), and the alternating torque T1 is loaded on the specimen 17 by the rotary actuator 14.

  When the electric motor 2 rotates in the R1 direction, as shown in FIG. 5, the drive shaft 1, the test shaft 11 and the outer shaft 21 rotate in the R1, R2, and R3 directions, respectively. The electric motor 2 can also be rotated in the opposite direction.

The alternating torque of the rotary actuator 14 will be described.
As shown in FIG. 5, the rotary actuator 14 can generate a torsion torque T <b> 1 on the test shaft 11. By alternately and repeatedly changing the direction of the torsional torque T1, alternating torque can be generated as shown in the graph of A of FIG. In the graph of A, the horizontal axis is the elapsed time, and the vertical axis is the torque value of the torsion torque T1.

  The torsional torque T1 generated by the rotary actuator 14 is applied to the specimen 17 attached to the specimen attaching part 18, and the reaction force is applied to the drive shaft 1 and the outer shaft 21 as torsional torque T2 and torsional torque T3. Communicated. Therefore, when the rotary actuator 14 generates an alternating torque as the torsion torque T1 on the test shaft 11 as shown in the graph of FIG. 5A, the drive shaft 1 has a graph of B of FIG. As shown in the figure, a combined torsion torque of pre-torque t2 and torsion torque T2 is applied. Further, as shown in the graph of FIG. 5C, the outer shaft 21 is applied with a torsional torque that is a combination of the pre-torque t1 and the torsional torque T3. In the graphs B and C, the horizontal axis represents the elapsed time, and the vertical axis represents the torque values of the torsion torques T2 and T3. Further, the pre-torques t1 and t2 are set so as not to always become 0 as shown in the graphs B and C of FIG. 5 even when the rotary actuator 14 applies the torsional torque T1 to the specimen 17. . That is, the magnitude (absolute value) of the pre-torque t1 is larger than the magnitude (absolute value) of the torsion torque T3, and the magnitude (absolute value) of the pre-torque t2 is larger than the magnitude (absolute value) of the torsion torque T2. Set to be larger.

  In this way, the pre-torques t1 and t2 are set so as not to always become 0 even when the rotary actuator 14 applies the torsional torque T1 to the specimen 17, so that the meshing of the teeth of the gear mechanism is as shown in FIG. The states illustrated by K1 to K4 can always be maintained, and backlash can be reliably prevented.

  Next, a description will be given of a second embodiment of the torque load test apparatus according to the present invention. FIG. 6 is an example of a schematic conceptual diagram of a second embodiment of the torque load test apparatus according to the present invention. In the description of the second embodiment, components corresponding to those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The number of test shafts 11 disposed between the drive shaft 1 and the outer shaft 21 is one in the first embodiment, but two in the second embodiment are disposed. Adjacent test shaft first gears 12 and test shaft second gears 13 mesh with each other. Other configurations and operations of the second embodiment are substantially the same as those of the first embodiment.

  In this way, the torque load test apparatus is provided with a plurality of test shafts 11, and the specimen 17 can be attached to each test shaft 11. Therefore, it is possible to perform a test in which an arbitrary alternating torque is applied to the plurality of specimens 17 with a single torque load test device. The alternating torque draws a smooth curve as shown in the graphs of A1 and A2 in FIG. 5, and the torque waveform is not distorted.

  Next, a third embodiment of the torque load test apparatus according to the present invention will be described. FIG. 7 is an example of a schematic conceptual diagram of a third embodiment of the torque load test apparatus according to the present invention. In the description of the third embodiment, components corresponding to those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the first embodiment, a rotary actuator 14 as a torque load device for a specimen for applying a load torque to the specimen 17 and a pre-torque setting device 24 for setting a pre-torque in a gear mechanism are provided. In the embodiment, instead of the rotary actuator 14 and the pre-torque setting device 24 of the first embodiment, a rotary actuator 51 is provided on the outer shaft 21. The rotary actuator 51 has the functions of both a specimen torque load device for applying a load torque to the specimen 17 and a pre-torque setting device for setting a pre-torque in the gear mechanism. That is, in a state where the specimen 17 is not attached, the rotary actuator 51 is operated to make the outer shaft second gear 23 differential with respect to the outer shaft first gear 22, so that the pre-torque t1, t2 is applied to the gear mechanism. After that, the specimen 17 is attached, and the torsional torque T1, which is the load torque, is applied to the specimen 17 by the rotary actuator 51.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the embodiments, and various modifications can be made within the scope of the gist of the present invention described in the claims. Is possible. Examples of modifications of the present invention are illustrated below.
(1) It is also possible to interpose an intermediate gear between the gear of the drive shaft and the gear of the test shaft, or between the gear of the test shaft and the gear of the outer shaft. For example, the gear of the test shaft can be meshed with the gear of the drive shaft via an intermediate gear. Needless to say, it is also possible to mesh directly without an intermediate gear. (Use a motor with low rotation speed and high low-speed torque.)

(2) If the pre-torque setting device can set the pre-torque by rotating the outer shaft first gear 22 with respect to the outer shaft second gear 23, the structure and type thereof can be changed as appropriate. . For example, a hydraulic rotary actuator (24) is also possible.

(3) Although the pre-torque setting device is provided on the outer shaft 21 in the embodiment, it can also be provided on the drive shaft 1. In this case, the pre-torque is set by rotating the drive shaft first gear 6 with respect to the drive shaft second gear 7.

(4) The case flange 32 and the input shaft flange 34 are fixed by spline coupling at the coupling 36, but may be fixed by other means such as bolts. However, when fixed by spline coupling, deviation is less likely to occur and fine angle setting is possible.
(5) Although the torque load device for a specimen is composed of the rotary actuator 14, if the torque can be applied to the specimen 17, its structure and type can be changed as appropriate.

(6) In the embodiment, the alternating torque is applied while rotating the specimen, but the torque applied to the specimen does not necessarily need to be the alternating torque, and it is possible only with a torque in a certain direction.
(7) The number of test shafts 11 disposed between the drive shaft 1 and the outer shaft 21 is one or two in the embodiment, but may be three or more.

(8) The rotary actuator 14 and the pre-torque setting device 24 are arranged outside the gears on both sides, but can also be arranged between the gears on both sides.
(9) The rotation drive device 2 may be provided on any of the drive shaft 1, the test shaft 11, and the outer shaft 21.

(10) The specimen torque load device 14 may be provided on any one of the drive shaft 1, the test shaft 11, and the outer shaft 21.
(11) The invention of the present application is a technique for removing rattling, and the influence of the backlash of the gear mechanism can be eliminated by bringing the teeth of meshing gears into close contact with each other. That is, since the impact at the time of rotation start of the rotation drive device 2 is eliminated, the durability of the gear mechanism is improved.
(12) Torque can be applied to the specimen 17 without rotating the drive shaft 1, the test shaft 11, and the outer shaft 21.

  In addition to the test shaft to which the specimen is attached and the drive shaft for rotationally driving the test shaft, an outer shaft arranged in a closed loop with the drive shaft and the gear mechanism is provided. At least one of them is provided with a pre-torque setting device, and the pre-torque setting device sets the pre-torque so as to eliminate the influence of backlash of the closed-loop gear mechanism. Therefore, even when an alternating torque is applied to the specimen, it is possible to prevent the gear of the gear mechanism from backlashing as much as possible, the torque waveform can be changed smoothly, and the durability of the gear is improved. be able to. Therefore, it is most suitable to apply to a torque load test apparatus that can apply load torque to the specimen.

FIG. 1 is an example of a schematic conceptual diagram of a first embodiment of a torque load test apparatus according to the present invention. FIG. 2 is a conceptual diagram of the pre-torque setting device after setting the pre-torque. FIG. 3 is a conceptual diagram of the pre-torque setting device before the pre-torque setting. FIG. 4 is an explanatory diagram for explaining the meshing of gear teeth. FIG. 5 is an explanatory diagram for explaining the torque and the like during the test. FIG. 6 is an example of a schematic conceptual diagram of a second embodiment of the torque load test apparatus according to the present invention. FIG. 7 is an example of a schematic conceptual diagram of a third embodiment of the torque load test apparatus according to the present invention. 8A and 8B are explanatory diagrams of a conventional example. FIG. 8A is a schematic diagram, and FIG. 8B is a waveform diagram of torque applied to a specimen. FIG. 9 is an explanatory diagram for explaining the state of meshing of the gears of the conventional example.

Explanation of symbols

1 Drive shaft 2 Electric motor (rotation drive device)
6 Drive shaft first gear 7 Drive shaft second gear 11 Test shaft 12 Test shaft first gear 13 Test shaft second gear 14 Rotary actuator (torque load device for specimen)
DESCRIPTION OF SYMBOLS 17 Specimen 18 Specimen attachment part 21 Outer shaft 22 Outer shaft first gear 23 Outer shaft second gear 24 Pretorque setting device 31 Case of pretorque setting device

Claims (5)

In a torque load test apparatus that can apply load torque to a specimen,
A drive shaft that is rotationally driven by the drive device for rotation and includes a drive shaft first gear and a drive shaft second gear;
A test shaft first gear meshing with the drive shaft first gear, a test shaft second gear meshing with the drive shaft second gear, a specimen mounting portion to which the specimen is detachably attached, and a specimen mounting portion A test shaft provided with a torque load device for a specimen for applying a load torque to the attached specimen;
The outer shaft first gear meshing with the test shaft first gear, the outer shaft second gear meshing with the test shaft second gear, and the outer shaft second gear rotating relative to the outer shaft first gear. And an outer shaft having a pre-torque setting device for setting the pre-torque,
Drive shaft first gear, test shaft first gear, outer shaft first gear, outer shaft axis, outer shaft second gear, test shaft second gear, drive shaft second gear, and drive shaft axis Is placed in a closed loop with no specimen attached ,
In the pre-torque setting device, the outer shaft second gear is rotated relative to the outer shaft first gear, the teeth of the meshing gears of the closed loop gear mechanism are brought into close contact with each other, and the torque load device for the specimen A torque load test apparatus characterized in that even if alternating torque with alternating torque directions is generated, the influence of backlash of the closed loop gear mechanism can be eliminated . In a torque load test apparatus that can apply load torque to a specimen,
A pre-torque is set by rotating the drive shaft first gear, the drive shaft second gear, and the drive shaft second gear relative to the drive shaft first gear while being rotated by the drive device for rotation. A drive shaft provided with a pre-torque setting device,
A test shaft first gear meshing with the drive shaft first gear, a test shaft second gear meshing with the drive shaft second gear, a specimen mounting portion to which the specimen is detachably attached, and a specimen mounting portion A test shaft provided with a torque load device for a specimen for applying a load torque to the attached specimen;
An outer shaft first gear meshing with the test shaft first gear, and an outer shaft comprising an outer shaft second gear meshing with the test shaft second gear;
Drive shaft first gear, test shaft first gear, outer shaft first gear, outer shaft axis, outer shaft second gear, test shaft second gear, drive shaft second gear, and drive shaft axis Is placed in a closed loop with no specimen attached ,
The pre-torque setting device rotates the drive shaft second gear relative to the drive shaft first gear so that the meshing gear teeth of the closed loop gear mechanism are in close contact with each other, and the torque load device for the specimen A torque load test apparatus characterized in that even if alternating torque with alternating torque directions is generated, the influence of backlash of the closed loop gear mechanism can be eliminated .   Two or more test shafts are arranged between the drive shaft and the outer shaft, and the adjacent test shafts are engaged with each other between the test shaft first gears and the test shaft second gears. The torque load test apparatus according to claim 1 or 2, wherein   The torque load test apparatus according to any one of claims 1 to 3, wherein the pre-torque setting device is constituted by a differential reduction gear that can rotate together with the case. In a torque load test apparatus that can apply load torque to a specimen,
A drive shaft comprising a drive shaft first gear and a drive shaft second gear;
A test shaft first gear meshing with the drive shaft first gear, a test shaft second gear meshing with the drive shaft second gear, and a test shaft comprising a specimen mounting portion to which the specimen is detachably attached ,
An outer shaft first gear meshing with the test shaft first gear, and an outer shaft comprising an outer shaft second gear meshing with the test shaft second gear;
A drive device for rotation that rotates the drive shaft, the test shaft, and the outer shaft;
A torque load device for a specimen that applies a load torque to the specimen attached to the specimen attachment portion is disposed on any one of the drive shaft, the test shaft, and the outer shaft,
Drive shaft first gear, test shaft first gear, outer shaft first gear, outer shaft axis, outer shaft second gear, test shaft second gear, drive shaft second gear, and drive shaft axis However , when the specimen is not attached, it is arranged in a closed loop shape, the meshing teeth of the closed loop gear mechanism are brought into close contact with each other, and the torque load device for the specimen generates an alternating torque in which the direction of the torque is alternately changed. Even so, the influence of backlash of the closed-loop gear mechanism can be eliminated.

Images