Test apparatus

Abstract

To provide a test apparatus for power transmission components that does not require a high-torque output motor and is capable of changing the slip ratio during a test operation.SOLUTION: The test apparatus includes: two motors for independently rotating two rotary shafts on which respective rollers of two pairs of rollers are mounted; and two pressing force applying devices for independently applying pressing forces to the two pairs of rollers, so that a test in which the slip ratio is frequently changed can be efficiently performed and a torque circulation can be generated by the two pairs of rollers to enable a test of high output torque with a low output torque motor.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a testing device for power transmission components, and more particularly to a rolling friction testing device. [Background technology]

[0002] In the development of electric vehicle drive systems, particularly in the development of smaller motors that can be driven at higher speeds, the reducers combined with the motors must also be able to withstand high speeds, and as a countermeasure, it is necessary to test the transmission efficiency and seizure resistance of gears and traction drives, which are power transmission components, at high speeds. One type of test for high-speed rotation of power transmission components is the rolling friction test, and research and development of rolling friction test equipment is currently underway in the field of electric vehicles as well.

[0003] Conventionally, as rolling friction testing equipment, a two-cylinder testing machine is often used to measure the coefficient of friction (traction coefficient), and a roller pitting testing machine is often used to evaluate rolling fatigue. Regarding the two-cylinder testing machine, Patent Document 1 is a patent publication relating to technology using the two-cylinder testing machine, and regarding the roller pitting testing machine, Non-Patent Document 1 is an introductory article about the roller pitting testing machine. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 52-9881 [Non-patent literature]

[0005] [Non-Patent Document 1] Takashi Maruyama, "Introduction of the Roller Pitching Tester RPT-402", Sanyo Technical Report Vol. 21 (2014) No. 1

[0006] A configuration diagram of a two-cylinder testing machine is shown in Figure 1. The two-cylinder testing machine rotates two opposing, contacting rollers, each driven by a separate motor, to test the sliding friction that occurs between the rollers. As shown in Figure 1, roller 13 is rotated by input-side motor 12 via input-side rotating shaft 11, and roller 23 is rotated by output-side motor 22 via output-side rotating shaft 21, and rollers 13 and 23 are pressed together with a pressing force set by pressing force applying device 14. A torque meter 15 is installed between motor 12 and roller 13.

[0007] If the rotation speed of input-side rotating shaft 11 driven by input-side motor 12 differs from the rotation speed of output-side rotating shaft 21 driven by output-side motor 22, slippage occurs between roller 13 and roller 23, and a sliding friction force is generated based on the pressing force set by pressing force applying device 14. Then, as shown by the arrows drawn along the rotation axes, the sliding friction force between roller 13 and roller 23 transmits the output torque generated by input-side motor 12 from input-side rotating shaft 11 -> roller 13 -> roller 23 -> output-side rotating shaft 21 -> output-side motor 22.

[0008] The two-cylinder testing machine, with the configuration shown in Figure 1, can perform various tests related to rolling friction by causing slippage between rollers 13 and 23. The rotation speeds of input-side motor 12 and output-side motor 22 can be set as desired while changing the pressing force set by pressing force applying device 14, which has the advantage of easily providing any desired slip ratio between rollers 13 and 23, and is particularly popular for tests requiring measurement of the coefficient of friction. On the other hand, a high-torque motor and a large-capacity power supply are required to apply a large amount of power to rollers 13 and 23, which has the disadvantage of making the power supply and motor expensive and the operation of the testing machine expensive.

[0009] Figure 2 shows the configuration of a roller pitting tester. The roller pitting tester is a rolling friction tester consisting of a motor that rotates one of two parallel rotating shafts, two rollers attached to each of the two rotating shafts and in contact with each other, and a gear mechanism attached to each of the two rotating shafts and meshing to transmit rotational force. As shown in Figure 2, roller 33 is rotated by input motor 32 via input rotating shaft 31. Furthermore, through the meshing of gear 34 attached to input rotating shaft 31 and gear 44 attached to output rotating shaft 41, the rotation of input rotating shaft 31 is transmitted to output rotating shaft 41, rotating roller 43. Rollers 33 and 43 are pressed together with a pressing force set by pressing force applying device 35. A torque meter 36 is installed between motor 32 and roller 33.

[0010] If the ratio of the radii of roller 33 attached to input-side rotating shaft 31 and roller 43 attached to output-side rotating shaft 41 differs from the ratio of the radii of gear 34 attached to input-side rotating shaft 31 and gear 44 attached to output-side rotating shaft 41, the rotational speeds of the outermost surfaces of roller 33 and roller 43 will differ, causing slippage between them and generating a sliding friction force based on the pressing force set by pressing force imparting device 14. Then, as shown by the arrows along the rotating shafts, rollers, and gears, the sliding friction force between roller 13 and roller 23 transmits the output torque generated by input-side motor 32 from input-side rotating shaft 31 to roller 33 to roller 43 to output-side rotating shaft 41 to output-side gear 44, and the torque transmitted to output-side gear 44 is returned from output-side gear 44 to input-side rotating shaft 31 to roller 33, generating a torque circulation.

[0011] The roller pitting tester, as shown in Figure 2, generates slip between rollers 33 and 43, enabling various tests related to rolling friction. The roller pair (roller 33, roller 43) and the gear (gear 34, gear 44) mesh together to create a closed-loop torque cycle: roller 33 → roller 43 → output shaft 41 → output gear 44 → input shaft 31 → roller 33. This allows high-output torque tests to be performed using a low-torque motor, making it suitable for fatigue tests requiring long periods of operation. However, the slip ratio remains constant due to the ratio of the radii of rollers 33 and 43 to those of gears 34 and 44. Therefore, tests with different slip ratios require the replacement of rollers or gears, making it inefficient and unsuitable for tests requiring frequent changes in slip ratio, such as measuring the coefficient of friction. Summary of the Invention [Problem to be solved by the invention]

[0012] As described above, a twin-cylinder testing machine requires a high-torque motor and a large-capacity power supply to apply a large amount of power to the roller pair, which results in high operating costs and makes the machine unsuitable for long-term fatigue testing. Furthermore, a roller pitching testing machine requires roller or gear replacement to perform tests with different slip ratios, which makes it inefficient and unsuitable for tests such as measuring the coefficient of friction, which require frequent changes in slip ratio. The present invention overcomes these drawbacks of conventional twin-cylinder testing machines and roller pitching testing machines by developing a testing machine that does not require a high-torque motor and can change the slip ratio during testing. The term "slip ratio" refers to the percentage of the speed at which two rollers, rotating in contact with each other, are sliding relative to the speed of the contact surfaces of the two rollers (the percentage difference in speed between the contact surfaces of the two rollers). [Means for solving the problem]

[0013] In order to solve these problems, the testing device of the present invention is configured to include two rotating shafts arranged in parallel, two motors that rotate the two rotating shafts independently, two sets of roller pairs each consisting of two rollers attached to each of the two rotating shafts, which contact each other to transmit rotational torque, and two pressing force applying devices that apply pressing forces independently to the two sets of roller pairs.

[0014] This configuration includes two motors that independently rotate the two rotating shafts on which the rollers of the two roller pairs are mounted, and two pressing force applying devices that independently apply pressing forces to the two roller pairs. This allows for efficient testing with frequently changing slip ratios, and also allows for high-torque testing using a low-torque motor by circulating torque between the two roller pairs. This also makes it advantageous for fatigue testing, which requires long-term operation.

[0015] Furthermore, in the testing device of the present invention, a torque meter is provided on one of the two rotating shafts, between the motor that drives the one rotating shaft and the roller on the motor side, and between the roller and the roller on the opposite side of the motor. With this configuration, the output torque of the motor and the pressing force applied by the pressing force applying device can be adjusted while referring to the output value of the torque meter, allowing for efficient rolling friction testing of power transmission parts.

[0016] In addition, in the testing device of the present invention, the radius of the rollers attached to one of the rotating shafts is made smaller than the radius of the rollers attached to the other rotating shaft, thereby increasing the speed of the other rotating shaft. With this configuration, torque is transmitted from the output rotating shaft to the input rotating shaft, increasing the speed and achieving high rotation speeds.

[0017] In the testing device of the present invention, one of the two roller pairs is a test roller pair from which test result data is output, and the speed increase ratio of the test roller pair is larger than that of the other roller pair. With this configuration, the torque is transmitted from the input rotating shaft in the direction from the test roller pair to the other roller pair, and torque circulation from the test roller pair to the input rotating shaft to the other roller pair to the output rotating shaft can be generated.

[0018] Furthermore, the testing device of the present invention is configured to include a control device that receives the output from the torque meter and controls the output torque of the two motors and the pressing forces of the two pressing force applying devices. With this configuration, the pressing forces can be adjusted more accurately and efficiently by a computer-based control device without manual intervention.

[0019] Furthermore, the testing apparatus of the present invention is configured to control the pressing force of at least one of the two pressing force applying devices based on the output from the torque meter so that the required output torque of the motor that rotates the other rotating shaft is reduced and the speed is increased to achieve high rotation. With this configuration, the control device can accurately and efficiently reduce the output torque of the motor located downstream in the torque transmission direction and increase the speed to achieve high rotation.

[0020] In addition, in the test method using the test apparatus of the present invention, the pressing force of the other roller pair relative to the pressing force of the test roller pair is set so that the required output torque of the motor rotating the other rotating shaft is reduced and the speed is increased to achieve high rotation. This makes it possible to adjust the pressing force by a control device or manually. If the pressing force is adjusted manually rather than by a control device, the equipment cost for the control device is unnecessary and the test can be performed at low cost using a simple test apparatus. [Effects of the Invention]

[0021] In this way, the present invention has the advantageous effect of being able to perform tests in which the slip ratio is frequently changed by rotating two rotating shafts independently with two motors and applying a pressing force independently to each of the two roller pairs, and also being able to perform high-output torque tests using a low-output torque motor by generating torque circulation using the two roller pairs, thereby advantageously performing fatigue tests that require long-term operation. [Brief explanation of the drawings]

[0022] [Figure 1] Diagram of the conventional two-cylinder testing machine [Figure 2] Schematic diagram of a conventional roller pitching test device [Figure 3] 1 is a diagram showing the configuration of a test device according to the present invention; [Figure 4] Block diagram of the control device of the present invention [Figure 5] Flow diagram of the test implementation of the present invention DETAILED DESCRIPTION OF THE INVENTION

[0023] An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 3 shows a configuration diagram of a rolling friction test apparatus 100, which is a test apparatus for power transmission components of the present invention. The rolling friction test apparatus 100 has an input-side rotating shaft 111 (one of the rotating shafts) and an output-side rotating shaft 112 (the other of the rotating shafts) arranged in parallel. The input-side rotating shaft 111 is equipped with an input-side test roller 131 and an input-side circulating roller 133 and is rotated by an input motor 121. The output-side rotating shaft 112 is equipped with an output-side test roller 132 and an output-side circulating roller 134 and is rotated by an output motor 122. The input-side test roller 131 (roller on the motor side) and the output-side test roller 132 are in contact with each other and transmit torque due to rotation to each other, constituting a test roller pair (one of the roller pairs). In addition, the input side circulation roller 133 (the roller opposite the motor) and the output side circulation roller 134 are in contact with each other and transmit torque due to rotation to each other, constituting a circulation roller pair (the other roller pair). In both the test roller pair and the circulation roller pair, the radius of the input side roller is set larger than the radius of the output side roller, and the output side rotation shaft 112 rotates faster than the input side rotation shaft 111.

[0024] By making the ratio of the radius of the input-side test roller 131 to the radius of the output-side test roller 132 different from the ratio of the radius of the input-side circulating roller 133 to the radius of the output-side circulating roller 134, slippage occurs in at least one of the test roller pair and the circulating roller pair. A pressing force Ft is applied to the test roller pair by a pressing force application device 141, and a pressing force Fc is applied to the circulating roller pair by a pressing force application device 142. The slip ratios of the test roller pair and the circulating roller pair are determined by the ratio of the radii of the input-side test roller 131 to the output-side test roller 132, the ratio of the radii of the input-side circulating roller 133 to the output-side circulating roller 134, and the pressing forces Ft and Fc.

[0025] A torque meter 151 is provided on the input side rotating shaft 111 between the input motor 121 and the input side test roller 131, and can measure the rotational torque Ti transmitted from the input motor 121 to the input side test roller 131. In addition, a torque meter 152 is provided between the input side circulating roller 133 and the input side test roller 131, and can measure the rotational torque Tic transmitted from the input side circulating roller 133 to the input side test roller 131. By observing the values ​​of these rotational torques Ti and Tic during test operation, the tester or a control device adjusts the output torque and rotation speed of the input motor 121 and output motor 122, as well as the pressing forces Ft and Fc of the pressing force applying devices 141 and 142.

[0026] By adjusting the output torque and rotation speed of the input motor 121 and the output motor 122 and the pressing forces Ft and Fc of the pressing force applying devices 141 and 142, a closed-loop torque circulation can be generated, as shown by the arrows in Figure 3: input-side test roller 131 → output-side test roller 132 → output-side rotating shaft 112 → output-side circulating roller 134 → input-side circulating roller 133 → input-side rotating shaft 111 → input-side test roller 131. This torque circulation significantly amplifies the output torque of the input motor 121, so even if the input motor 121 has a low output torque, it can obtain a high output torque and perform the test. Furthermore, in this case, the required output torque of the output motor 122 can be set to a small value.

[0027] Next, referring to Fig. 3, it will be explained that when torque circulation is caused with the two roller pair configuration of the test device of the present invention, a high output torque can be obtained with a motor with low output torque, and the required output torque of the output motor 122 can be set small and increased to achieve high rotation. If the torque is T, the pressing force is F, the roller radius is R, the friction coefficient is μ, and the transmission efficiency is η, and the subscripts are i for input, o for output, t for test roller, and c for circulation roller, the output torque Ti of the input motor and the output torque To of the output motor are respectively expressed as follows with reference to Fig. 3. [Number 1] Ti = Tit - Tic Equation (1) [Number 2] To=Tot-Toc · · · Formula (2)

[0028] The torques Tit and Tic of the test roller and the circulating roll on the input shaft side are [Number 3] Tit=μtFtRit ···· Formula (3) [Number 4] Tic=ηcμcFcRic ···· Formula (4) Therefore, substituting into equation (1) [Number 5] Ti=Tit-Tic=μtFtRit-ηcμcFcRic...Equation (5) In exactly the same way, [Number 6] To=Tot-Toc=ηtμtFtRot-μcFcRoc...Equation (6)

[0029] Here, if we adjust the parameters of the input and output motors, such as the rotation speed, output torque, and pressing force, and set the friction coefficients μt, μc, and transmission efficiency ηt to appropriate values ​​so that the output torque of the output motor To = 0, then from equation (6), [Number 7] ηtμtFtRot=μcFcRoc · · · Equation (7) The ratio of the output torque Ti of the input motor to the torque Tit applied to the test roller on the input side can be calculated from equations (1), (3), and (4) using the relationship in equation (7): [Number 8] Tit / Ti=1 / (1−ηcηt(Rot / Rit) / (Roc / Ric))... Equation (8)

[0030] When the acceleration rate from the input side to the output side differs between the test roller pair and the circulating roller pair, output torque is generated by frictional force caused by slippage between the location where the test roller is attached and the location where the circulating roller is attached on the output-side rotating shaft. The direction of transmission of the generated output torque is explained using Figure 3. Assuming that the peripheral speed of test roller 131 (the speed of the contact surface with test roller 132), the peripheral speed of test roller 132 (the speed of the contact surface with test roller 131), the peripheral speed of circulating roller 133 (the speed of the contact surface with circulating roller 134), and the peripheral speed of circulating roller 134 (the speed of the contact surface with circulating roller 133) are all approximately the same, torque is transmitted from the high-speed test roller 132 to the low-speed circulating roller 134 because the diameter of test roller 132 is smaller than the diameter of circulating roller 134. Therefore, the rotation speed of test roller 132 increases with the rotation speed of circulating roller 134. On the other hand, the torque transmitted from the input-side rotating shaft 111 is transmitted from the high-speed circulating roller 133 to the low-speed test roller 131 because the diameter of the circulating roller 133 is smaller than that of the test roller 131. This causes an internal circulation of the transmitted torque: test roller 132 -> circulating roller 134 -> circulating roller 133 -> test roller 131 -> test roller 132. Thus, in order for the output torque generated on the output side rotating shaft 112 from the mounting portion of the test roller 132 to the mounting portion of the circulating roller 134 to be a torque in the same direction as the output torque of the output motor 122, the rotation at the mounting portion of the test roller 132 must be faster than the rotation at the mounting portion of the circulating roller 134, and also, in order for the torque to be transmitted from the mounting portion of the circulating roller 133 to the mounting portion of the test roller 131 on the input side rotating shaft 111, the rotation at the mounting portion of the circulating roller 133 must be faster than the rotation at the mounting portion of the test roller 131. That is, [Number 9] Rot / Rit < Roc / Ric ···· Formula (9) Under this condition, from equation (8), the closer the values ​​of "Roc / Ric" to "Rot / Rit", the greater the ratio of the torque Tit applied to the input side test roller to the output torque Ti of the input motor.

[0031] For example, if the transmission efficiencies ηc and ηt are both 98%, Rot / Rit = 0.40, and Roc / Ric = 0.41, then the torque amplification ratio is 16 (times) according to equation (8). Using a drive motor with a rotational speed of 20,000 rpm and an output torque of 5 kW as the output / input motor, a rotational speed of 50,000 rpm and an output torque of 80 kW can be obtained (note that this output is not output from the test equipment, but is output circulated within the test equipment), enabling testing under loads equivalent to those of an automobile. In other words, using the test equipment of the present invention, a low-output motor with an output torque of several kW can be operated at high output torques of nearly 100 kW. Furthermore, it is possible to efficiently conduct testing by changing the slip ratio during operation. In this case, if the output motor generates an output at a rotational speed of 50,000 rpm, the output torque can theoretically be approximately zero.

[0032] Next, Fig. 4 is a block diagram showing the relationship between the hardware components (motor, pressing force applying device, torque meter, etc.) shown in Fig. 3 of the testing device, the control device, and the input / output interface to the control device when the testing device of the present invention is controlled using a control device. As shown in Fig. 4, the testing device 100 of the present invention includes the hardware components 101 of the testing device shown in Fig. 3, as well as a control device 200 and an input / output interface 300 which are not shown in Fig. 3.

[0033] The control device 200 includes a control unit 210, a storage unit 220, and a control device data transmission / reception unit 230. The control unit 210 is a central processing unit (CPU) that performs data calculations and various control processes. The control unit 210 includes a data calculation processing unit 211, which uses calculation programs stored in the storage unit 220 and various data such as the dimensions of the test roller and circulating roller to calculate the optimum values ​​of the rotation speed and output torque of the input motor 121 and the output motor 122, and the optimum values ​​of the pressing force of the pressing force imparting device 141 of the test roller and the pressing force imparting device 142 of the circulating roller 142.

[0034] The memory unit 220 includes memory components such as RAM, DRAM, SRAM, ROM, mask ROM, PROM, EPROM, EEPROM, and flash memory, and stores various programs and predetermined data used by the control unit 210, and also saves data transmitted and received between the input / output interface 300 via the data transmission / reception unit 230.

[0035] The data transmission / reception unit 230 of the control device communicates with the hardware configuration 101 of the test device, and transmits data calculated by the data calculation processing unit 211 of the control unit 210 to the input motor 121, the output motor 122, the test roller pressing force applying device 141, and the circulating roller pressing force applying device 142, while receiving measurement data from the torque meters 151 and 152. It also communicates with the input / output interface 300 via the data transmission / reception device 330 of the input / output interface, and receives data input by the input / output interface 300 and transmits data to be output (displayed) by the input / output interface 300. Within the control device 200, data is transmitted and received between the control unit 210 and the storage unit 220.

[0036] The input / output interface 300 comprises an input / output processing unit / storage unit 310, a data input / output unit 320, and an input / output interface data transmission / reception unit 330. The input / output processing unit / storage unit 310 processes data input by the data input / output unit 320 into a format usable by the control device 200, and processes measurement data obtained from the control device 200 via the input / output interface data transmission / reception unit 330 so that it can be displayed on the display screen of the data input / output unit 320, and also stores programs and data for these processes.

[0037] The data input / output unit 320 allows a person to manually input necessary data using a keyboard, mouse, various switches, dials, and joysticks, and also outputs and displays data related to test results, etc. sent from the control device 200 via the data transmission / reception unit 330 of the input / output interface on a monitor including a screen such as an LCD or organic EL screen, or on a paper output device, so that a person can see the test results, etc.

[0038] The data transmission / reception unit 330 of the input / output interface communicates with the data transmission / reception unit 230 of the control device, and transmits input data or processed data received from the input / output processing unit / storage unit 310 or data input / output unit 320 to the control device 200, and also receives output data related to test results and the like transmitted from the control device 200. Within the input / output interface 300, data is transmitted and received between the input / output processing unit / storage unit 310 and the data input / output unit 320.

[0039] Next, the flow of carrying out the test of the present invention will be described with reference to Fig. 5. When carrying out the test of the present invention, first, the input side rotating shaft 111 and the output side rotating shaft 112 of the test device 100 are set so that they can be rotated by the input motor 121 and the output motor 122, respectively, and then an input side test roller 131 and an output side test roller 132 are attached to them to form a test roller pair, and an input side circulating roller 133 and an output side circulating roller 134 are attached to form a circulating roller pair (step S1). Note that the test device 100 is also equipped with pressing force applying devices 141, 142, torque meters 151, 152, etc.

[0040] Here, the radius of the input-side test roller 131 is set larger than the radius of the output-side test roller 132, and the radius of the input-side circulating roller 133 is set larger than the radius of the output-side circulating roller 134, so that the rotation speed of the output shaft is faster than the rotation speed of the input shaft in both the test roller pair and the circulating roller pair. Also, by setting the ratio of the radius of the output-side test roller 132 to the radius of the input-side test roller 131 and the ratio of the radius of the output-side circulating roller 134 to the radius of the input-side circulating roller 133 to be different, slippage occurs in at least one of the test roller pair or the circulating roller pair.

[0041] In this case, by making the ratio of the radius of the output side test roller 132 to the radius of the input side test roller 131 smaller than the ratio of the radius of the output side circulating roller 134 to the radius of the input side circulating roller 133 (i.e., by making the rotational speed amplification factor at the test roller pair larger than the rotational speed amplification factor at the circulating roller pair, the rotational speed at the output side rotating shaft 112 is made higher at the test roller pair than at the circulating roller pair), the direction of transmission of torque circulation can be made to be from the test roller pair to the circulating roller pair on the output side rotating shaft.

[0042] Next, the required slip ratio between the input test roller 131 and the output test roller 132 of the test roller pair is set according to the test to be performed (step S2). For example, in a friction fatigue test or the like, where the test equipment is operated over a long period of time at a constant slip ratio, it may be possible to set the slip ratio only once. However, in a test where the friction coefficient is measured or the resistance to friction is tested at a variable slip ratio, it may be necessary to change the slip ratio while the test equipment is running.

[0043] During operation of the testing device, the output torque and rotation speed of the input motor 121 and the output motor 122, as well as the pressing forces applied by the pressing force applying device 141 of the test roller pair and the pressing force applying device 142 of the circulating roller pair, are adjusted (step S3) while observing (feedback) the slip ratio of the test roller pair so as to obtain the slip ratio of the test roller pair set in step S2 above, under the condition that the required output torque of the output motor 122 decreases and the speed is increased to achieve high rotation speeds. For this adjustment, the input motor 121, the output motor 122, the pressing force applying device 141 of the test roller pair and the pressing force applying device 142 of the circulating roller pair may all be controlled by a control device, or at least some of them may be controlled (adjusted) manually.

[0044] In the adjustment of step S3, first, the required output torque of the output motor 122 is observed, and it is determined whether the required output torque of the output motor 122 has been sufficiently reduced to an expected level (step S4). The required output torque of the output motor 122 can be observed from the values ​​of the current and voltage flowing through the output motor 122. If the determination result is YES, that is, if it is confirmed that the required output torque of the output motor 122 has been sufficiently reduced to an expected level, the process proceeds to the next step S5. If the determination result is NO, that is, if the required output torque of the output motor 122 has not been sufficiently reduced to an expected level, the process returns to step S3 and adjustment is performed again. Thereafter, the loop of step S3 → step S4 → step S3 is repeated until the determination in step S4 becomes YES.

[0045] If the determination in step S4 is YES, and it is confirmed that the required output torque of the output motor 122 is sufficiently small as expected, the slip ratio of the test roller pair is observed to determine whether the set desired slip ratio is being achieved (step S5). The slip ratio of the test roller pair can be calculated from the rotation speeds of the input motor 121 and the output motor 122 and the radii of the test rollers 131 and 132. If the determination is YES, that is, if it is confirmed that the set desired slip ratio is being achieved, the process proceeds to step S6. If the determination is NO, that is, if the set desired slip ratio is not being achieved, the process returns to step S3 and adjustment is performed again. Thereafter, the loop of steps S3 -> S4 -> S5 -> S3 is repeated until the determination in step S5 is YES.

[0046] If the result of the determination in step S5 is YES and it is confirmed that the desired slip ratio is achieved for the test roller pair, then the necessary tests (measurement of friction coefficient, evaluation of rolling fatigue, etc.) are performed at the desired set slip ratio for the test roller pair, and the test results are displayed on the display device (step S6).

[0047] Depending on the test content, it may be necessary to perform tests at multiple slip ratios with the test roller pair. Therefore, next, a determination is made as to whether tests have been performed at all planned slip ratios (Step S7). If the determination result is YES, i.e., if tests have been performed at all planned slip ratios, the test ends. If the determination result is NO, i.e., if tests have not been performed at all planned slip ratios and there are still other slip ratios that need to be tested, the process returns to Step S2 and changes to another slip ratio that needs to be tested. Thereafter, the loop of Step S2 -> Step S3 -> Step S4 -> Step S5 -> Step S6 -> Step S7 -> Step S2 is repeated until the determination in Step S7 becomes YES.

[0048] The above describes the implementation of the present invention, but the present invention is not limited to these embodiments, and it goes without saying that the present invention can be implemented in various forms within the scope of the spirit of the present invention. [Explanation of symbols]

[0049] 10. Two-cylinder testing machine (conventional example) 11 Input side rotating shaft 12 Input side motor 13 Input roller 14 Pressing force applying device 15 Torque meter 21 Output rotating shaft 22 Output motor 23 Output roller 30 Roller pitting test machine (conventional example) 31 Input side rotating shaft 32 Input motor 33 Input roller 34 Input gear 35 Pressing force applying device 36 Torque meter 41 Output side rotating shaft 43 Output roller 44 Output gear 100 Rolling friction test device (Example of the present invention) 101 Hardware configuration of rolling friction test equipment 111 Input side rotating shaft 112 Output side rotating shaft 121 input motor 122 output motor 131 Input side test roller 132 Output side test roller 133 Input side circulation roller 134 Output side circulation roller 141 Test roller pressing force applying device 142 Circulation roller pressing force applying device 151,152 Torque meter 200 control device 210 Control Unit (CPU) 211 Data processing unit 220 Memory Unit 230 Data transmission / reception unit of control device 300 Input / Output Interface 310 Data Processing Unit / Storage Unit 320 Input / Output Unit 330 Input / output interface data transmission / reception unit

Claims

1. Two rotating shafts arranged in parallel, two motors that rotate the two rotary shafts independently of each other; two pairs of rollers each attached to one of the two rotary shafts, the rollers contacting each other to transmit rotational torque; two pressing force applying devices that independently apply pressing forces to the two roller pairs, respectively; A test device comprising:

2. On one of the two rotation shafts, 2. The testing device according to claim 1, wherein a torque meter is provided between the motor that drives one of the rotary shafts and the roller on the motor side, and between the roller and the roller on the opposite side of the motor.

3. 3. A testing device according to claim 2, wherein the radius of the roller attached to one of the rotating shafts is made smaller than the radius of the roller attached to the other rotating shaft, thereby increasing the speed of the other rotating shaft.

4. 4. The testing device according to claim 3, wherein one of the two roller pairs is a test roller pair from which test result data is output, and the speed increase ratio of the test roller pair is greater than the speed increase ratio of the other roller pair.

5. 5. The testing device according to claim 4, further comprising a control device that receives an output from the torque meter and controls the output torques of the two motors and the pressing forces of the two pressing force applying devices.

6. 6. The testing device according to claim 5, wherein the control device controls the pressing force of at least one of the two pressing force applying devices based on an output from the torque meter so as to reduce a required output torque of a motor that rotates the other rotating shaft.

7. A testing method using the testing device according to claim 4, A testing method in which the pressing force of the other roller pair relative to the pressing force of the test roller pair is set so that the required output torque of the motor that rotates the other rotary shaft is reduced.

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