JP7376778B2 - Rotating test equipment - Google Patents

Description

The present invention relates to a rotation testing device for testing the rotation of a specimen such as a motor.

2. Description of the Related Art Rotation test apparatuses that perform rotation tests on specimens such as motors are known. As such a rotation test apparatus, for example, as disclosed in Patent Document 1, a rotating body for rotating a specimen, and a rotating body provided between the specimen and the rotating body, the rotating body being provided between the specimen and the rotating body. A rotation testing device comprising: an intermediate shaft rotatably connecting the intermediate shaft; an intermediate bearing portion having a bearing rotatably supporting the intermediate shaft; and a torque meter located between the rotating body and the bearing. Are known. For example, FIG. 2 of Patent Document 1 discloses that a rolling bearing is used as the bearing.

In the rotation testing apparatus of Patent Document 1, the loss occurring in the bearing is less affected by temperature changes in the lubricating oil, thereby suppressing a decrease in detection accuracy of the torque generated by the specimen.

JP2019-28041A

In a rotation test of a specimen using a rotation test device as described above, the torque generated by the specimen is determined by considering the loss generated in the rotation test device with respect to the torque detected by the torque detection unit. be able to.

By the way, in the rotation testing apparatus, loss occurs in the bearing portion that rotatably supports the rotating shaft. Therefore, in order to accurately determine the torque generated by the specimen from the torque detected by the torque detection unit of the rotation test device, it is preferable that the loss generated in the bearing during the rotation test of the specimen is constant. .

However, since the loss generated in the bearing changes depending on the rotation speed, the amount of heat generated in the bearing due to the loss also changes depending on the rotation speed. Due to this change in the amount of heat generated, the expansion of the rotating shaft and the bearing and the viscosity of the lubricating oil also change, so that the loss generated in the bearing further changes. Therefore, even if the rotational speed of the rotation test device reaches the test rotational speed of the specimen, the temperature of the bearing and the temperature of the lubricating oil inside the bearing are difficult to converge, so it is difficult for the loss generated in the bearing to become constant. Therefore, when performing a rotation test on a specimen using a rotation test device, after the rotation speed of the specimen reaches the test rotation speed, the temperature of the bearing becomes constant and the loss generated in the bearing becomes constant. , takes a long time.

As described above, when performing a rotation test on a specimen using a rotation test device, if it takes time for the loss generated in the bearing to become constant, the time required to start the rotation test on the specimen becomes longer.

An object of the present invention is to quickly stabilize the loss occurring in the bearing after the rotational speed of the specimen reaches the test rotational speed in a rotation test device in which a bearing is located between a rotating body and a specimen. The goal is to obtain a possible configuration.

A rotation test device according to an embodiment of the present invention is provided with a rotating body that rotates a specimen, and a rotating body that rotatably connects the specimen and the rotating body. a rotating shaft; a bearing that rotatably supports the rotating shaft by a plurality of rolling elements; a housing that holds the bearing; a heating section that heats the housing; and a heating control unit that controls the amount of heating by the heating unit so that the temperature reaches a predetermined temperature when the heating unit rotates at a certain speed (first configuration).

Thereby, the temperature of the bearing of the rotation testing apparatus can quickly reach the temperature of the bearing when the rotating body rotates at a predetermined rotation speed. That is, by heating the housing with the heating unit so that the temperature of the housing holding the bearing becomes the predetermined temperature when the rotating body rotates at a predetermined rotation speed, Also, since the bearing can be heated through the housing, the temperature of the bearing can be quickly kept constant.

Therefore, the loss that occurs in the bearing when the rotating body rotates at a predetermined rotation speed can be quickly made constant. Therefore, after the rotational speed of the rotating body reaches the predetermined rotational speed, torque measurement can be started quickly.

In the first configuration, the rotation testing device further includes a temperature detection section that detects the temperature of the housing. The heating control section controls the amount of heating by the heating section according to the temperature detected by the temperature detection section so that the temperature of the housing becomes the predetermined temperature (second configuration).

Thereby, the rotation testing apparatus can perform heating control of the heating section according to the temperature of the housing. Therefore, the loss that occurs in the bearing when the rotating body rotates at a predetermined rotation speed can be made constant more quickly. Therefore, after the rotational speed of the rotating body reaches the predetermined rotational speed, high-precision measurement of torque can be started more quickly.

In the first or second configuration, the rotation testing device further includes a torque meter located between the rotating body and the bearing, and a torque measurement control section that controls torque measurement by the torque meter. The torque measurement control unit performs torque measurement by the torque meter based on at least one temperature, including the temperature of the housing, of the temperature of the housing, the temperature of the rotating shaft, and the temperature of the torque meter. 3 configuration).

This makes it possible to measure torque using a torque meter after confirming that the temperature of the bearing is stable. Therefore, torque measurement can be performed with better reproducibility.

In the third configuration, the rotation testing device further includes a torque meter temperature detection section that detects the temperature of the torque meter. The torque measurement control unit controls the temperature of the torque meter and the torque meter temperature detected by the torque meter temperature detection unit when the temperature difference between the temperature of the housing and the housing temperature target value is within a first temperature range. When the temperature difference from the target value is within the second temperature range, torque is measured by the torque meter (fourth configuration).

The torque measurement control unit is configured such that the temperature of the torque meter is within a second temperature range near the convergence temperature with respect to a torque meter temperature target value that is a temperature of the torque meter that converges when the rotating body rotates at a predetermined rotation speed. After confirming this, measure the torque. This makes it possible to measure torque with almost no influence from the temperature characteristics of the torque meter.

In the third or fourth configuration, the rotation testing apparatus further includes a rotating shaft temperature detection section that detects the temperature of the rotating shaft. The torque measurement control unit controls the temperature of the rotating shaft and the rotating shaft temperature detected by the rotating shaft temperature detection unit when the temperature difference between the temperature of the housing and the housing temperature target value is within a first temperature range. When the temperature difference from the target value is within the third temperature range, torque is measured by the torque meter (fifth configuration).

The torque measurement control unit determines that the temperature of the rotating shaft is within a third temperature range near the convergence temperature with respect to the target value of the rotating shaft temperature, which is the temperature of the rotating shaft that converges when the rotating body rotates at a predetermined rotation speed. After checking, perform torque measurement. This makes it possible to measure torque while the temperature of the bearing is more stable.

As mentioned above, by monitoring the temperature of the torque meter (fourth configuration) and the temperature of the rotating shaft (fifth configuration) in addition to the housing temperature, the temperature around the bearing and the torque meter can be stabilized. After confirming this, torque measurement can be performed, and torque measurement with better reproducibility can be performed.

In any one of the first to fifth configurations, the predetermined rotational speed is the highest rotational speed of the rotating body in a rotation test of the specimen (sixth configuration). Thereby, in the rotation test of the specimen, the heating unit can apply an amount of heat to the housing such that the housing reaches a predetermined temperature when the rotating body rotates at the maximum rotation speed. Therefore, even when the rotating body is rotating at any rotation speed below the maximum rotation speed in the rotation test of the specimen, the temperature of the housing can be brought to the predetermined temperature more quickly. Therefore, the temperature of the bearing can be quickly kept constant.

Therefore, the loss that occurs in the bearing when the rotating body rotates at a predetermined rotation speed can be quickly made constant. Therefore, after the rotational speed of the rotating body reaches the predetermined rotational speed, highly accurate measurement of torque can be started quickly.

In any one of the first to sixth configurations, the heating section heats a portion of the housing located radially outward of the bearing (seventh configuration). Thereby, the portion of the housing located near the bearing can be efficiently heated by the heating section. Therefore, the temperature of the bearing can be made constant more quickly.

Therefore, the loss that occurs in the bearing when the rotating body rotates at a predetermined rotation speed can be made constant more quickly. Therefore, after the rotational speed of the rotating body reaches the predetermined rotational speed, highly accurate measurement of torque can be started more quickly.

In any one of the first to seventh configurations, the rotation testing device further includes a lubricant supply unit that sprays lubricant into the bearing (eighth configuration).

As a result, the amount of lubricating oil supplied to the bearing is smaller than when lubricating oil is directly supplied to the bearing, so changes in loss due to changes in the viscosity of the lubricating oil can be minimized.

Furthermore, since almost no heat is exchanged through the lubricating oil in the bearing, the housing near the bearing can be heated without the heat generated by the heating section that heats the housing being absorbed by the lubricating oil. This makes it possible to maximize the effects of the first to sixth configurations of increasing the accuracy of torque measurement and speeding up the loss convergence of the bearing by keeping the bearing temperature constant.

A rotation test device according to an embodiment of the present invention includes: a bearing rotatably supporting a rotating shaft rotatably connecting a specimen and a rotating body by a plurality of rolling elements; a housing holding the bearing; The heating unit includes a heating unit that heats the housing, and a heating control unit that controls the amount of heating by the heating unit so that the temperature of the housing becomes a predetermined temperature when the rotating body rotates at a predetermined number of rotations.

Thereby, the temperature of the housing can quickly reach the predetermined temperature. Therefore, the loss occurring in the bearing can be quickly made constant. Therefore, after the rotating body reaches the predetermined rotational speed, highly accurate measurement of torque can be started quickly.

FIG. 1 is a block diagram showing a schematic configuration of a vehicle testing device according to an embodiment. FIG. 2 is a diagram schematically showing the configuration of the bearing support section and the manner in which lubricating oil is supplied to the intermediate bearing. FIG. 3 is a diagram of the intermediate shaft and the housing viewed from the test motor side. FIG. 4 is a diagram showing the relationship between the calorific value of the intermediate bearing and the calorific value difference depending on the rotation speed of the intermediate shaft. FIG. 5 is a block diagram showing a schematic configuration of a heating control device and a torque measurement control device of a vehicle testing device according to another embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the dimensions of the constituent members in each figure do not faithfully represent the actual dimensions of the constituent members and the dimensional ratios of each constituent member.

(overall structure)
FIG. 1 is a block diagram showing a schematic configuration of a vehicle testing device 1 (rotation testing device) according to an embodiment. The vehicle test device 1 is a test device for obtaining various measurement data of the test motor 2, which is a test object, while the test motor 2 is being rotated.

The vehicle test device 1 includes a dynamo 11 (rotating body) that is drivingly connected to the test motor 2, an intermediate shaft 31 (rotating shaft) that rotatably connects the test motor 2 and the dynamo 11, and a test motor 2. 2 and a torque meter 41 (torque detection section) that detects the torque generated. Reference numeral 3 in FIG. 1 is a motor control device that controls the drive of the motor 2 under test.

The motor control device 3 controls the torque of the test motor 2 by supplying electric power to the test motor 2 according to the input torque command. The configuration of the motor control device 3 is similar to that of a conventional control device such as an inverter, so a detailed explanation will be omitted.

In this embodiment, the vehicle testing device 1 is used as an example of the rotation testing device, but it may be a testing device for other purposes.

The dynamo 11 is an electric motor, and its rotation speed is controlled. The configuration of the dynamo 11 is similar to that of a general electric motor, so a detailed explanation will be omitted. The dynamo 11 is provided with a rotation speed sensor 12 for detecting the rotation speed of a rotor (not shown).

The rotor of the dynamo 11 is connected to the rotor of the test motor 2 (not shown) via the intermediate shaft 31. Although not particularly illustrated, the rotor of the dynamo 11 and the intermediate shaft 31 are drivingly coupled by bolts connecting couplings provided on both. Further, although not particularly shown, the intermediate shaft 31 and the rotor of the test motor 2 are also drivingly connected by couplings fastened together with bolts.

The intermediate shaft 31 is provided with a torque meter 41 for detecting the torque generated between the dynamo 11 and the motor under test 2. Torque meter 41 is located between dynamo 11 and intermediate bearing 33, which will be described later. This torque meter 41 detects the difference in torsion angle that occurs in the intermediate shaft 31. The torque meter 41 determines the torque generated on the intermediate shaft 31 from the difference in the detected torsion angles and outputs it as a torque signal. Note that the torque value may be calculated by a control device or the like by outputting a signal corresponding to the difference in torsion angle from the torque meter 41.

The intermediate shaft 31 passes through the cylindrical housing 34 in the axial direction. The housing 34 supports intermediate bearings 32 and 33 (bearings). Portions of the housing 34 that support the intermediate bearings 32 and 33 constitute bearing support parts 34a and 34b. Note that the housing 34 is supported by a base 1a, which will be described later.

The intermediate shaft 31 is rotatably supported at two locations in the axial direction by intermediate bearings 32 and 33. The intermediate bearings 32 and 33 rotatably support a portion of the intermediate shaft 31 between the torque meter 41 and the motor under test 2. That is, the intermediate bearings 32 and 33 rotatably support the test motor 2 side of the intermediate shaft 31. Torque meter 41 is arranged between dynamo 11 and intermediate bearings 32 and 33.

The intermediate bearing 32 rotatably supports the test motor 2 side in the axial direction of the intermediate shaft 31. The intermediate bearing 33 is located closer to the dynamo 11 than the intermediate bearing 32 in the axial direction of the intermediate shaft 31.

The intermediate bearings 32 and 33 each have rolling elements 32a and 33a, inner rings 32b and 33b, and outer rings 32c and 33c. The inner rings 32b and 33b fit onto the outer peripheral surface of the intermediate shaft 31. The outer rings 32c and 33c are fixed to bearing supports 34a and 34b of a housing 34, which will be described later. The rolling elements 32a, 33a roll while being sandwiched between the inner rings 32b, 33b and the outer rings 32c, 33c.

Thereby, in the intermediate bearings 32 and 33, the intermediate shaft 31 can be rotatably supported with respect to the housing 34 via the rolling elements 32a and 33a. In this way, the intermediate bearings 32 and 33 are rolling bearings having rolling elements 32a and 33a, respectively. Note that the intermediate bearings 32 and 33 may have cylindrical members as rolling elements.

In the vehicle testing apparatus 1, the dynamo 11, intermediate shaft 31, housing 34, torque meter 41, and intermediate bearings 32, 33 are supported by the base 1a. Further, the test motor 2 is fixed to a motor fixing part 1b provided on the base 1a.

As shown in FIG. 2, lubricating oil is supplied to the intermediate bearings 32 and 33 by a lubricating oil supply device 20, which will be described later. The housing 34 is provided with a lubricating oil supply path (not shown) for supplying lubricating oil to the intermediate bearings 32 and 33. In FIGS. 1 to 3, the flow of lubricating oil from the lubricating oil supply device 20 to the intermediate bearings 32, 33 is schematically shown by thick dashed lines. Note that, in FIG. 2, the flow of lubricating oil from the intermediate bearings 32 and 33 to the lubricating oil supply device 20 is omitted. Further, in FIG. 3, the illustration of the lubricating oil supply device 20 is omitted, and only the flow of lubricating oil around the intermediate bearing 32 is illustrated.

As shown in FIG. 2, the intermediate bearings 32 and 33 are configured such that lubricating oil is supplied from the outside in the axial direction of the intermediate shaft 31 to the inside. Further, although not particularly illustrated, the intermediate shaft 31 has a larger outer diameter in the inner portion than the outer diameter of the outer portion of the intermediate bearings 32 and 33 in the axial direction. As a result, while the intermediate shaft 31 is rotating, the lubricating oil supplied to the intermediate bearings 32 and 33 flows inward in the axial direction of the intermediate shaft 31 with respect to the intermediate bearings 32 and 33.

As shown in FIG. 1, the vehicle testing apparatus 1 includes a lubricating oil supply device 20 (lubricating oil supply section) that supplies lubricating oil to intermediate bearings 32 and 33, respectively. The lubricating oil supply device 20 supplies lubricating oil to the intermediate bearings 32 and 33 together with air. Specifically, the lubricant supply device 20 includes an air pump 21 that discharges air, a lubricant discharge section 22 that discharges a small amount of lubricant in the form of mist into the air discharged by the air pump 21, It includes a lubricating oil control section 23 that controls the driving of the air pump 21 and the lubricating oil discharging section 22 .

The lubricating oil control unit 23 adjusts the amount of lubricating oil and the amount of air supplied to the intermediate bearings 32 and 33 by controlling the driving of the air pump 21 and the lubricating oil discharge unit 22 .

In this way, the lubricating oil supply device 20 supplies lubricating oil to the intermediate bearings 32 and 33 together with air. In other words, by making the lubricating oil into a mist using compressed air and supplying the mist of lubricating oil mixed with air to the intermediate bearings 32 and 33, the intermediate bearing 32 and The amount of lubricating oil supplied to the inside of 33 becomes extremely small. Thereby, loss due to the viscosity of the lubricating oil and change in loss due to changes in the viscosity of the lubricating oil can be minimized. In addition, in order to further reduce loss, the amount of lubricating oil and air amount that minimizes loss is determined in advance for each rotation speed, and the amount of oil and air per unit time is adjusted based on the results. Good too.

The temperature of the lubricating oil inside the intermediate bearings 32, 33 is determined by the rolling friction of the bearings and the bearing temperature. However, when the intermediate shaft 31 rotates at a constant speed, by quickly bringing the bearing temperature to a predetermined temperature, the temperature of the lubricating oil inside the intermediate bearings 32 and 33 quickly becomes constant. Therefore, even if a loss occurs due to the viscosity of the lubricating oil slightly present in the intermediate bearings 32, 33, the loss occurring in the intermediate bearings 32, 33 is quickly stabilized.

Furthermore, since almost no amount of heat is exchanged through the lubricating oil in the intermediate bearings 32 and 33, the bearing temperature can be quickly and stably controlled to a predetermined temperature. That is, since the bearing temperature control is not affected by oil lubrication, the bearing temperature is quickly and stably controlled to a predetermined temperature. When the bearing temperature becomes stable, the change in loss due to changes in the viscosity of the lubricating oil becomes smaller and becomes stable. Due to this relationship between the stability of bearing temperature and the stability of loss due to lubricating oil, highly accurate measurement of torque can be effectively realized.

The housing 34 is provided with heating parts 35 and 36 that heat the bearing support parts 34a and 34b, respectively. As shown in FIGS. 2 and 3, a plurality of (eight in this embodiment) heating parts 35 and 36 are arranged in the circumferential direction inside the housing 34 so as to surround the intermediate bearings 32 and 33, respectively. heaters 35a and 36a.

The heaters 35a and 36a are rod-shaped and arranged in the housing 34 so as to extend in the axial direction of the intermediate shaft 31. The heaters 35a, 36a are located near the intermediate bearings 32, 33 in the bearing supports 34a, 34b, and at a diameter relative to the contact points between the rolling elements 32a, 33a, the inner rings 32b, 33b, and the outer rings 32c, 33c. Located outward in the direction.

Here, when a loss occurs in the intermediate bearings 32 and 33 due to the rotation of the intermediate shaft 31, the intermediate bearings 32 and 33 expand in the radial direction due to the heat generated by the loss. Then, at the contact points, the frictional force between the rolling elements 32a, 33a and the inner rings 32b, 33b and the outer rings 32c, 33c changes, thereby changing the loss occurring in the intermediate bearings 32, 33. Since the temperature of the intermediate bearings 32 and 33 differs depending on the rotation speed, it takes a long time for the temperature to stabilize after changing the rotation speed. Therefore, the efficiency of torque measurement decreases.

In contrast, by arranging the heaters 35a, 36a near the intermediate bearings 32, 33 and radially outward of the contact points to heat the housing 34 and the outer rings 32c, 33c, as described above, Changes in frictional force due to thermal expansion can be suppressed. Thereby, during a rotation test of the test motor 2, it is possible to suppress fluctuations in loss due to temperature fluctuations of the intermediate bearing after changing the rotation speed.

In particular, as will be described later, the temperature of the bearing support parts 34a, 34b of the housing 34 is the temperature of the bearing support parts 34a, 34b of the housing 34 when the dynamo 11 rotates at the maximum rotation speed in the rotation test of the test motor 2. By controlling the heating of the heaters 35a, 36a so that the loss occurring in the intermediate bearings 32, 33 can be quickly made constant. The amount of heating of the heaters 35a and 36a is controlled by a heating control device 50, which will be described later.

Note that the shape of the heaters 35a, 36a may be an annular shape surrounding the intermediate bearings 32, 33 in the circumferential direction, or may be an arc shape. That is, the shape of the heaters 35a, 36a may be other than rod-like as long as the shape can heat the bearing support parts 34a, 34b of the housing 34. Further, the heating unit 35 may include a heating device other than the heater as long as it is configured to heat the bearing support portions 34a, 34b of the housing 34.

As shown in FIG. 2, the bearing support part 34a of the housing 34 is provided with a temperature detection part 37 that detects the temperature Ts1 of the bearing support part 34a. The bearing support portion 34b of the housing 34 is provided with a temperature detection portion 38 that detects the temperature Ts2 of the bearing support portion 34b. It is preferable that the temperature detection parts 37 and 38 are provided near the intermediate bearings 32 and 33 in the bearing support parts 34a and 34b. Note that the temperature detection sections 37 and 38 may be provided at positions away from the intermediate bearings 32 and 33 in the bearing support sections 34a and 34b. That is, the temperature detection parts 37 and 38 detect the bearing support parts 34a and 34b at positions where they can detect temperature changes in the bearing support parts 34a and 34b due to heat generated in the intermediate bearings 32 and 33 when the intermediate shaft 31 rotates. , 34b.

The vehicle testing apparatus 1 includes a heating control device 50 (heating control section) that controls the driving of the heating sections 35 and 36. The heating control device 50 uses the temperature difference between the temperature Ts1 (housing temperature) of the bearing support portion 34a of the housing 34 detected by the temperature detection unit 37 and the target temperature Tsref1 (predetermined temperature, housing temperature target value). , controls the driving of the heating section 35. The heating control device 50 uses the temperature difference between the temperature Ts2 (housing temperature) of the bearing support portion 34b of the housing 34 detected by the temperature detection unit 38 and the target temperature Tsref2 (predetermined temperature, housing temperature target value). , controls the driving of the heating section 36.

Specifically, the heating control device 50 includes a temperature difference calculation section 51a and a heating command generation section 52.

The temperature difference calculation unit 51a is configured by subtracters 151a and 251a in FIG. 5, which will be described later. The temperature difference calculation unit 51a calculates the temperature difference between the temperature Ts1 of the bearing support portion 34a of the housing 34 detected by the temperature detection unit 37 and the target temperature Tsref1. The temperature difference calculation unit 51a calculates the temperature difference between the temperature Ts2 of the bearing support portion 34b of the housing 34 detected by the temperature detection unit 38 and the target temperature Tsref2. The target temperature Tsref1 is set to the temperature of the bearing support portion 34a of the housing 34 when the dynamo 11 rotates at the maximum rotation speed in the rotation test of the motor 2 under test. The target temperature Tsref2 is set to the temperature of the bearing support portion 34b of the housing 34 when the dynamo 11 rotates at the maximum rotation speed in the rotation test of the motor 2 under test.

The heating command generation unit 52 generates a heating command for the heating units 35 and 36 based on the temperature difference calculated by the temperature difference calculation unit 51a. If the heating command generation unit 52 determines that the difference between the temperature Ts1 of the bearing support portion 34a of the housing 34 and the target temperature Tsref1 is large based on the temperature difference calculated by the temperature difference calculation unit 51a, the heating command generation unit 52 controls the temperature of the heating unit 35. While generating a heating command to increase the amount of heating, if it is determined from the temperature difference that the difference between the temperature Ts1 of the bearing support part 34a of the housing 34 and the target temperature Tsref1 is small, the amount of heating of the heating part 35 is increased. A heating command to reduce or stop heating by the heating unit 35 is generated.

Similarly, if the heating command generation unit 52 determines that the difference between the temperature Ts2 of the bearing support portion 34b of the housing 34 and the target temperature Tsref2 is large based on the temperature difference calculated by the temperature difference calculation unit 51a, the heating command generation unit 52 performs heating. While generating a heating command to increase the heating amount of the heating section 36, if it is determined from the temperature difference that the difference between the temperature Ts2 of the bearing support section 34b of the housing 34 and the target temperature Tsref2 is small, the heating command for increasing the heating amount of the heating section 36 is generated. A heating command is generated to reduce the amount of heating or to stop heating by the heating unit 36.

Note that the heating command generation unit 52 may have any configuration as long as it has a configuration that allows the temperature Ts1 of the bearing support portion 34a of the housing 34 to reach the target temperature Tsref1 by heating by the heating unit 35. You may do so. The heating command generation unit 52 may have any configuration as long as it has a configuration that allows the temperature Ts2 of the bearing support portion 34b of the housing 34 to reach the target temperature Tsref2 by heating by the heating unit 36. It's okay.

As described above, the heating control device 50 controls the temperature of the bearing support parts 34a, 34b of the housing 34 when the dynamo 11 rotates at the maximum rotation speed in the rotation test of the test motor 2. , 34b.

Here, the amount of heating is calculated from the amount of heat generated in the intermediate bearings 32 and 33 when the dynamo 11 rotates at the maximum rotation speed with the test motor 2 removed from the vehicle testing device 1. This is the value obtained by converting the difference in the amount of heat generated by subtracting the amount of heat generated in the intermediate bearings 32, 33 due to the rotation of the housing 34 into the amount of heat in the bearing support portions 34a, 34b of the housing 34.

The calorific value difference Wh is determined using the following equations (1) and (2).
Wfm[W]=2π×Nm[r/min]×Tfm[Nm]/60 (1)
Wh[W]=Wfm[W]-2π×N[r/min]×Tf[Nm]/60 (2)

Here, Nm is the maximum rotation speed of the intermediate shaft 31 in the rotation test of the sample motor 2, and Tfm is the friction torque generated in the intermediate bearings 32 and 33 at the maximum rotation speed. Further, N is the current rotation speed of the intermediate shaft 31, and Tf is the friction torque generated in the intermediate bearings 32 and 33 at the current rotation speed.

As mentioned above, the calorific value difference Wh is calculated from the calorific value Wfm generated in the intermediate bearings 32 and 33 when the intermediate shaft 31 rotates at the maximum rotation speed in the rotation test of the sample motor 2, and the current rotation of the intermediate shaft 31. It is obtained by subtracting the amount of heat generated in the intermediate bearings 32 and 33 from the number. FIG. 4 shows the relationship between the calorific value of the intermediate bearings 32 and 33 and the calorific value difference Wh according to the rotational speed of the intermediate shaft 31. As shown in FIG. 4, when the rotational speed of the intermediate shaft 31 increases, the amount of heat generated by the intermediate bearings 32 and 33 increases. Therefore, as the rotational speed of the intermediate shaft 31 increases, the calorific value difference Wh decreases.

The amount of heat generated in the intermediate bearings 32 and 33, which is determined using equations (1) and (2) above, is the amount of heat generated by the intermediate bearing 32 on the test motor 2 side and the amount of heat generated on the dynamo (rotating body) 11 side. This value is the sum of the heat generation amount of the intermediate bearing 33 and the amount of heat generated by the intermediate bearing 33. Therefore, the value obtained by converting the calorific value difference Wh obtained as described above into the calorific value in the bearing support parts 34a, 34b of the housing 34 corresponds to the sum of the heating amounts of the heating parts 35, 36.

The heating control device 50 calculates the heating amount according to the rotational speed of the intermediate shaft 31 from the relationship between the rotational speed of the intermediate shaft 31 and the calorific value difference Wh shown in FIG. 36 is driven and controlled.

The heating control device 50 controls the driving of the heating parts 35 and 36 based on the amount of heating calculated according to the rotational speed of the intermediate shaft 31, and also monitors the temperature of the bearing supports 34a and 34b to determine whether the temperature is By driving and controlling the heating units 35 and 36 so as to reach a predetermined temperature (convergence temperature during operation at the maximum rotation speed), the predetermined temperature can be reached more quickly.

Alternatively, the heating control device 50 controls the driving of the heating parts 35 and 36 based on the amount of heating determined in advance through experiments according to the rotation speed, and also monitors the temperature of the bearing support parts 34a and 34b, and adjusts the temperature accordingly. The heating units 35 and 36 may be driven and controlled so that the temperature reaches a predetermined temperature (the convergence temperature during operation at the maximum rotation speed).

With the above configuration, the temperature of the intermediate bearings 32 and 33 of the vehicle testing device 1 can be quickly adjusted to the temperature of the intermediate bearings 32 and 33 when the intermediate shaft 31 rotates at the maximum rotation speed in the rotation test of the test motor 2. can be reached. That is, the temperatures of the bearing support parts 34a and 34b of the housing 34 that holds the intermediate bearings 32 and 33 become the target temperatures Tsref1 and Tsref2 when the intermediate shaft 31 rotates at the highest rotation speed in the rotation test of the sample motor 2. By heating the bearing support parts 34a, 34b of the housing 34 by the heating parts 35, 36, the intermediate bearings 32, 33 can be heated via the bearing support parts 34a, 34b. can be quickly made constant.

Therefore, the loss that occurs in the intermediate bearings 32 and 33 when the intermediate shaft 31 rotates at the highest rotational speed in the rotation test of the motor 2 under test can be quickly made constant. Therefore, after the rotation speed of the dynamo 11 reaches the test rotation speed of the test motor 2, the rotation test of the test motor 2 can be started quickly.

In addition, by supplying lubricating oil to the intermediate bearings 32, 33 together with air, the lubricating oil supplied to the intermediate bearings 32, 33 is more efficient than when lubricating oil is directly supplied to the intermediate bearings 32, 33. The amount of oil can be reduced. As a result, the amount of heat exchanged via the lubricating oil in the intermediate bearings 32, 33 is almost eliminated, so that the temperature of the intermediate bearings 32, 33 can be easily adjusted. Therefore, the mechanical loss occurring in the vehicle testing apparatus 1 can be controlled with higher accuracy.

Moreover, since the amount of lubricating oil supplied to the intermediate bearings 32 and 33 is reduced as described above, it is possible to reduce the agitation loss of the lubricating oil in the intermediate bearings 32 and 33 due to the rotation of the intermediate shaft 31. Thereby, the loss of the intermediate bearings 32 and 33 at the maximum rotation speed can also be reduced, so that the amount of heat generated by the heating parts 35 and 36 can be reduced.

(Other embodiments)
Although the embodiments of the present invention have been described above, the embodiments described above are merely examples for implementing the present invention. Therefore, without being limited to the embodiments described above, the embodiments described above can be modified and implemented as appropriate without departing from the spirit thereof.

In the embodiment described above, the heating control device 50 controls the temperature of the bearing supports 34a, 34b of the housing 34 when the dynamo 11 rotates at the maximum rotation speed in the rotation test of the test motor 2. The heating amount of the heating unit 35 is controlled so that the temperature is maintained. However, the heating control device controls the heating amount of the heating part so that the temperature of the bearing support part becomes the temperature of the bearing support part of the housing when the dynamo 11 rotates at a rotation speed lower than the maximum rotation speed. It's okay. In this case, although the upper limit of the rotational speed for torque measurement is lower, the amount of heating generated by the heating parts 35 and 36 can be reduced.

In the embodiment, the vehicle testing apparatus 1 measures the torque using the torque meter 41 after controlling the amount of heating of the heating parts 35 and 36 so that the temperature of the bearing supports 34a and 34b reaches a predetermined temperature. However, in the vehicle testing apparatus, the temperature around the bearing is not stable immediately after the start of the test rotation. In other words, the amount of heat generated by the heating parts 35 and 36, the amount of heat generated by the intermediate bearing, and the amount of heat generated by windage loss (loss due to friction with air) caused by the rotation of the torque meter and flange attached to the intermediate shaft. Therefore, time is required for the temperature of the bearings including the inner rings 32b and 33b of the intermediate bearings 32 and 33 to rise. Therefore, in order to determine whether the bearing temperature is stable, the temperature detection unit that detects the temperature on the intermediate shaft side confirms that the temperature on the intermediate shaft side is within a predetermined temperature range for each rotation speed. After that, the torque may be measured using a torque meter. By providing the vehicle test device with such a configuration, it is possible to confirm that the temperature state around the bearing is stable. Therefore, the vehicle test device can perform torque measurement with better reproducibility.

Note that the torque measurement value measured by the torque meter is affected by the temperature state of the torque meter. Therefore, in addition to ensuring that the temperature of the bearing support part is at a predetermined temperature, the vehicle test equipment also uses a temperature detection section that detects the temperature of the torque meter to ensure that the temperature of the torque meter is within a predetermined temperature range for each rotation speed. After confirming that this is the case, the torque may be measured using a torque meter. By providing the vehicle test device with such a configuration, it is possible to confirm that the temperature state of the torque meter is stable. Therefore, the vehicle test device can perform torque measurement with better reproducibility.

FIG. 5 is a functional block diagram showing an example of a schematic configuration of the heating control device 50 and the torque measurement control device 160 in the vehicle testing apparatus having the above-described configuration. Note that in FIG. 5 and the following description, the temperature Ts1 of the bearing support portion 34a is also referred to as a first bearing temperature, and the temperature Ts2 of the bearing support portion 34b is also referred to as a second bearing temperature.

The heating control device 50 heats the bearing support part 34a with the heating part 35 based on the target temperature Tsref1 of the first bearing temperature and the rotation speed N of the intermediate shaft 31. The heating control device 50 brings the temperature Ts1 of the bearing support portion 34a detected by the temperature detection unit 37 closer to the target temperature Tsref1, and also takes into account the rotation speed N of the intermediate shaft 31, that is, the rotation speed N output from the rotation speed sensor 12. to perform heating control.

Similarly, the heating control device 50 heats the bearing support portion 34b using the heating portion 36 based on the target temperature Tsref2 of the second bearing temperature and the rotation speed N of the intermediate shaft 31. The heating control device 50 brings the temperature Ts2 of the bearing support portion 34b detected by the temperature detection unit 38 closer to the target temperature Tsref2, and also takes into account the rotation speed N of the intermediate shaft 31, that is, the rotation speed N output from the rotation speed sensor 12. to perform heating control.

Specifically, the heating control device 50 includes a first bearing temperature control section 150 and a second bearing temperature control section 250. The first bearing temperature control section 150 controls heating of the bearing support section 34a by the heating section 35. The second bearing temperature control section 250 controls heating of the bearing support section 34b by the heating section 36.

The first bearing temperature control section 150 includes a heating feedback amount calculation section 151, a heating feedforward amount calculation section 153, a heating amount calculation section 154, and an adder 155. Note that the heating feedback amount calculation section 151, the heating feedforward amount calculation section 153, the heating amount calculation section 154, and the adder 155 correspond to the heating command generation section in FIG.

The second bearing temperature control section 250 includes a heating feedback amount calculation section 251 , a heating feedforward amount calculation section 253 , a heating amount calculation section 254 , and an adder 255 . Note that the heating feedback amount calculation section 251, the heating feedforward amount calculation section 253, the heating amount calculation section 254, and the adder 255 correspond to the heating command generation section in FIG.

In FIG. 5, the heating feedforward amount calculating section 153, 253 is referred to as a heating FF amount calculating section 153, 253 for the sake of simplicity.

The heating feedback amount calculation units 151 and 251 calculate the difference between the temperatures Ts1 and Ts2 of the bearing supports 34a and 34b detected by the temperature detection units 37 and 38, respectively, and the target temperatures Tsref1 and Tsref2. That is, the heating feedback amount calculation units 151 and 251 calculate the temperature increase required to adjust the temperatures Ts1 and Ts2 of the bearing supports 34a and 34b to the target temperatures Tsref1 and Tsref2, respectively.

Specifically, the heating feedback amount calculation units 151 and 251 calculate the temperatures Ts1 and Ts2 (housing temperatures) of the bearing supports 34a and 34b detected by the temperature detection units 37 and 38 and the target temperatures Tsref1 and Tsref2 (housing temperature target subtracters 151a and 251a that calculate the temperature difference between the subtracters 151a and 251a, and calculators 151b and 251b that perform PID calculations using the temperature difference calculated by the subtracters 151a and 251a. That is, in the heating control of the heating units 35, 36, the heating feedback amount calculating units 151, 251 calculate the temperature difference between the temperatures Ts1, Ts2 at the bearing supports 34a, 34b of the intermediate bearings 32, 33 and the target temperatures Tsref1, Tsref2. This is used as a feedback term for the amount of heating. Note that the subtracters 151a and 251a constitute a temperature difference calculation section in FIG.

The heating feedforward amount calculation units 153 and 253 use the rotational speed N output from the rotational speed sensor 12 and the calorific value difference Wh calculated by the above equation (2) as a feedforward term of the heating amount. Alternatively, the heating feedforward amount calculation units 153, 253 use, as the feedforward term, a heating amount according to the rotation speed, which is determined in advance through experiments.

The heating control device 50 calculates the above-mentioned difference in calorific value based on the ratio of the temperature difference calculated by the subtractor 151a functioning as a temperature difference calculation unit and the temperature difference calculated by the subtractor 251a functioning as a temperature difference calculation unit. The amount of heating obtained by distributing Wh is determined, and the heating units 35 and 36 are driven and controlled based on the amount of heating. Alternatively, the heating control device 50 performs drive control of the heating units 35 and 36 based on a heating amount determined in advance through experiments according to the rotation speed. This brings the bearing temperature closer to the desired temperature.

However, the amount of heat radiated from the housing surface varies depending on the ambient temperature and airflow conditions. Therefore, a feedback term of the amount of heating whose feedback value is the temperature difference between the temperatures Ts1, Ts2 and the target temperature Tsref1 in the bearing support parts 34a, 34b is added to the feedforward term of the amount of heating by the adders 155, 255. Let be the heating amount.

The heating amount calculation unit 154, 254 generates an actual heating command from the calculated heating amount.

Thereby, the heating control device 50 controls the heating portion so that the temperatures Ts1 and Ts2 at the bearing support portions 34a and 34b of the intermediate bearings 32 and 33 approach the target temperatures Tsref1 and Tsref2 based on the rotation speed N of the intermediate shaft 31. 35 and 36 heating controls can be performed.

The torque measurement control device 160 controls the start of torque measurement by the torque meter 41 based on the first bearing temperature, the second bearing temperature, the torque meter temperature, and the intermediate shaft temperature. Specifically, the torque measurement control device 160 includes a first bearing temperature difference determination section 161, a second bearing temperature difference determination section 163, a torque meter temperature difference calculation section 164, a torque meter temperature difference determination section 165, It has a torque measurement control section 166, an intermediate shaft temperature difference calculation section 167, and an intermediate shaft temperature difference determination section 168.

The first bearing temperature difference determination unit 161 determines whether the temperature difference calculated by the subtracter 151a of the first bearing temperature control unit 150 is smaller than the temperature difference A. The first bearing temperature difference determination section 161 outputs a command signal to the torque measurement control section 166 when the temperature difference is smaller than the temperature difference A. That is, the first bearing temperature difference determination section 161 outputs a command signal to the torque measurement control section 166 if the temperature difference is within the first temperature range.

The second bearing temperature difference determination unit 163 determines whether the temperature difference calculated by the subtracter 251a of the second bearing temperature control unit 250 is smaller than the temperature difference A. The second bearing temperature difference determination section 163 outputs a command signal to the torque measurement control section 166 when the temperature difference is smaller than the temperature difference A. That is, the second bearing temperature difference determination section 163 outputs a command signal to the torque measurement control section 166 if the temperature difference is within the first temperature range.

The torque meter temperature difference calculation unit 164 calculates the temperature difference between the temperature Ttq of the torque meter 41 and the target temperature value Ttqref (torque meter temperature target value) of the torque meter 41. Note that the temperature Ttq of the torque meter 41 is detected by a temperature detection section (not shown).

The torque meter temperature difference determination section 165 determines whether the temperature difference calculated by the torque meter temperature difference calculation section 164 is smaller than the temperature difference B. The torque meter temperature difference determination section 165 outputs a command signal to the torque measurement control section 166 when the temperature difference is smaller than the temperature difference B. That is, the torque meter temperature difference determination section 165 outputs a command signal to the torque measurement control section 166 if the temperature difference is within the second temperature range.

The intermediate shaft temperature difference calculation unit 167 calculates the temperature difference between the temperature Tis of the intermediate shaft 31 and the target value Tisref (rotating shaft temperature target value) of the temperature of the intermediate shaft 31. Note that the temperature Tis of the intermediate shaft 31 is detected by an intermediate shaft temperature detection section (not shown).

The intermediate shaft temperature difference determining section 168 determines whether the temperature difference calculated by the intermediate shaft temperature difference calculating section 167 is smaller than the temperature difference C. The intermediate shaft temperature difference determination section 168 outputs a command signal to the torque measurement control section 166 when the temperature difference is smaller than the temperature difference C. That is, the intermediate shaft temperature difference determination section 168 outputs a command signal to the torque measurement control section 166 if the temperature difference is within the third temperature range.

The torque measurement control unit 166 receives command signals from the first bearing temperature difference determination unit 161, the second bearing temperature difference determination unit 163, the torque meter temperature difference determination unit 165, and the intermediate shaft temperature difference determination unit 168, respectively. Then, a torque measurement command is generated and output. The torque measurement command output from the torque measurement control section 166 is input to a controller (not shown). In this controller, when the torque measurement command is input, the measured value of the torque meter 41 is acquired and torque measurement is performed.

By having the vehicle test device configured as described above, it is possible to confirm that the temperature state around the bearing is stable. Therefore, the vehicle test device can perform torque measurement with better reproducibility.

Further, the torque measurement control device uses only a plurality of temperatures including at least the first bearing temperature and the second bearing temperature among the first bearing temperature, the second bearing temperature, the torque meter temperature, and the intermediate shaft temperature. The start of torque measurement by 41 may be controlled.

For example, the torque measurement control device performs torque measurement using the torque meter 41 when the temperature difference between the first bearing temperature and the second bearing temperature is within the first temperature range.

Further, for example, when the temperature difference between the first bearing temperature and the second bearing temperature is within the first temperature range, the torque measurement control device may detect the temperature Ttq of the torque meter 41 detected by the torque meter temperature detection section and the torque meter When the temperature difference from the temperature target value Ttqref is within the second temperature range, torque measurement is performed using the torque meter 41. This makes it possible to measure torque with almost no influence from the temperature characteristics of the torque meter 41.

For example, when the temperature difference between the first bearing temperature and the second bearing temperature is within the first temperature range, the torque measurement control device may detect the temperature Tis of the intermediate shaft 31 detected by the intermediate shaft temperature detection section and the intermediate shaft temperature Tis detected by the intermediate shaft temperature detection section. When the temperature difference from the temperature target value Tisref is within the third temperature range, torque measurement is performed using the torque meter 41. This makes it possible to measure torque while the temperature of the bearing is more stable.

As mentioned above, by monitoring the temperature of the torque meter 41 and the temperature of the intermediate shaft 31 in addition to the first bearing temperature and the second bearing temperature, it was confirmed that the temperature conditions around the bearing and the torque meter were stable. Torque measurement can then be performed. Thereby, torque measurement with better reproducibility can be performed.

Note that when the temperature difference between the temperature Ttq of the torque meter 41 detected by the torque meter temperature detection section and the torque meter temperature target value Ttqref is within the second temperature range, the torque measurement control device also controls the temperature of the intermediate shaft. Assuming that the state is stable, the operations of the intermediate shaft temperature difference calculating section 167 and the intermediate shaft temperature difference determining section 168 may be omitted. Further, if there is no influence on the reproducibility of torque measurement, the torque measurement control device includes the second bearing temperature control section 250, the second bearing temperature difference determination section 163, the torque meter temperature difference calculation section 164, and the torque meter temperature difference determination section. 165, at least one of the intermediate shaft temperature difference calculation section 167 and the intermediate shaft temperature difference determination section 168 may not be included.

The torque measurement control unit 166 may generate and output a torque measurement command when a command signal is output from the first bearing temperature difference determination unit 161, or may generate and output a torque measurement command when a command signal is output from the first bearing temperature difference determination unit 161. In addition to the case where a command signal is output from at least one of the second bearing temperature difference determination section 163, the torque meter temperature difference determination section 165, and the intermediate shaft temperature difference determination section 168, the torque measurement command is output. It may be generated and output.

Note that the above-mentioned temperature differences A, B, and C are each set to a temperature range that does not affect the reproducibility of torque measurement when torque is measured by the torque meter 41. The reference temperature difference used in the determination by the first bearing temperature difference determining section 161 and the second bearing temperature difference determining section 163 may be the same temperature difference or may be a different temperature difference.

In the example of FIG. 5, the first bearing temperature control section 150 and the second bearing temperature control section 250 of the heating control device 50 prioritize shortening the temperature convergence time rather than reducing the temperature deviation, and the heating The amount of heating may be calculated only by the feedforward amount calculating sections 153 and 253.

In the embodiment, the motor control device 3 controls the torque of the motor under test 2 by supplying electric power to the motor under test 2 according to the input torque command. Further, the vehicle testing device 1 controls the rotation speed of the dynamo 11. However, the motor control device may control the rotation speed of the motor under test, and the vehicle testing device may control the torque of the dynamo.

In the embodiment, the intermediate shaft 31 is rotatably supported by intermediate bearings 32 and 33. However, the intermediate shaft 31 may be rotatably supported by three or more bearings. In this case, a heating section may be provided in a portion of the housing that holds each bearing.

In the embodiment, eight heaters 35a, 36a are provided in the bearing support parts 34a, 34b of the housing 34, respectively. Furthermore, the heaters 35a and 36a are arranged side by side in the circumferential direction so as to surround the intermediate bearings 32 and 33, respectively.

However, the number of heaters provided in the bearing support portion may be other than eight as long as the number can heat the portion of the housing that holds the intermediate bearing. Further, the heater may be disposed only in a portion of the housing in the circumferential direction, as long as it can heat the portion of the housing that holds the intermediate bearing. Furthermore, if the heating efficiency from the heater to the bearing differs depending on the structure of the bearing support part, etc., the balance of the heating amount of the heater may be changed. For example, the heating amount of the heater is increased for a portion of the bearing support portion where the thermal resistance is small, while the heating amount of the heater is decreased for a portion of the bearing support portion where the thermal resistance is large.

In the embodiment, the heaters 35a, 36a are provided in the bearing supports 34a, 34b, in the vicinity of the intermediate bearings 32, 33, and in contact with the rolling elements 32a, 33a, the inner rings 32b, 33b, and the outer rings 32c, 33c. Located radially outward from the point. However, the heater may be placed at any position in the bearing support portion as long as it can heat the vicinity of the intermediate bearing.

In the embodiment, the supplied lubricating oil flows inward in the axial direction of the intermediate shaft 31 in the intermediate bearings 32 and 33 . However, the lubricating oil flowing into the bearing may flow outward in the axial direction of the intermediate shaft 31, or may flow directly downward without flowing in the axial direction.

The rotation test device according to the present invention can be used in a configuration in which a dynamo and a specimen are rotatably connected by an intermediate shaft, and the intermediate shaft is rotatably supported by a bearing.

1 Vehicle test equipment (rotation test equipment)
2 Test motor (test object)
3 Motor control device 11 Dynamo (rotating body)
12 Rotation speed sensor 20 Lubricating oil supply device (lubricating oil supply section)
21 Air pump 22 Lubricating oil discharge section 23 Lubricating oil control section 31 Intermediate shaft (rotating shaft)
32 Intermediate bearing (bearing)
32a Rolling element 32b Inner ring 32c Outer ring 33 Intermediate bearing (bearing)
33a Rolling element 33b Inner ring 33c Outer ring 34 Housing 34a, 34b Bearing support part 35, 36 Heating part 35a, 36a Heater 37, 38 Temperature detection part 41 Torque detection part 50 Heating control device (heating control part)
51a Temperature difference calculation section 151, 251 Heating feedback amount calculation section 151a, 251a Subtractor 153, 253 Heating feedforward amount calculation section 154, 254 Heating amount command calculation section 155, 255 Adder 160 Torque measurement control device 161 First bearing temperature Difference determination section 163 Second bearing temperature difference determination section 164 Torque meter temperature difference calculation section 165 Torque meter temperature difference determination section 166 Torque measurement control section

Claims (6)

A rotation test device for performing a rotation test on a specimen,
a rotating body that rotates the specimen;
a rotating shaft provided between the specimen and the rotating body and rotatably connecting the specimen and the rotating body;
a bearing rotatably supporting the rotating shaft by a plurality of rolling elements;
a housing that holds the bearing;
a heating section that heats the housing;
a temperature detection unit that detects the temperature of the housing;
a heating control unit that controls the amount of heating by the heating unit according to the temperature detected by the temperature detection unit so that the temperature of the housing becomes a predetermined temperature when the rotating body rotates at a predetermined rotation speed; ,
a torque meter located between the rotating body and the bearing;
a rotating shaft temperature detection unit that detects the temperature of the rotating shaft;
a torque meter temperature detection section that detects the temperature of the torque meter;
a torque measurement control unit that controls torque measurement by the torque meter;
Equipped with
The torque measurement control unit performs torque measurement by the torque meter based on at least two temperatures including the temperature of the housing from among the temperature of the housing, the temperature of the rotating shaft, and the temperature of the torque meter.
Rotating test equipment . The rotation test device according to claim 1 ,
The torque measurement control unit controls the temperature of the torque meter and the torque meter temperature detected by the torque meter temperature detection unit when the temperature difference between the temperature of the housing and the housing temperature target value is within a first temperature range. A rotation testing device that measures torque using the torque meter when a temperature difference from a target value is within a second temperature range. The rotation test device according to claim 1 or 2 ,
The torque measurement control unit controls the temperature of the rotating shaft and the rotating shaft temperature detected by the rotating shaft temperature detection unit when the temperature difference between the temperature of the housing and the housing temperature target value is within a first temperature range. A rotation test device that measures torque using the torque meter when a temperature difference from a target value is within a third temperature range. The rotation test device according to claims 1 to 3 ,
The rotation test device, wherein the predetermined rotation speed is a maximum rotation speed of the rotating body in a rotation test of the specimen. The rotation test device according to any one of claims 1 to 4 ,
The heating unit heats a portion of the housing located radially outward of the bearing. The rotation test device according to any one of claims 1 to 5 ,
A rotation testing device further comprising a lubricant supply unit that sprays lubricant into the bearing.

Images