JP2019028041A - Rotation testing device - Google Patents

Abstract

To provide a rotation testing device in which a middle shaft for rotatably connecting a rotational body and a sample is rotatably supported by a bearing, the rotation testing device allowing suppression of a reduction of detection accuracy of torque that the sample generates by reducing an influence of a temperature change of lubricant on a loss in the bearing.SOLUTION: A testing device for a vehicle 1 includes: a dynamo 11; a middle shaft 31 for rotatably connecting a sample motor 2 and the dynamo 11 to each other; middle shaft bearing parts 32 and 33 for rotatably supporting the middle shaft 31; a torque detection unit 41 for detecting torque generated between the sample motor 2 and the dynamo 11; a lubricant supply device 20 for supplying lubricant to bearings 32a and 33a of the middle shaft bearing parts 32 and 33; and a lubricant heating unit 35 provided at the middle shaft bearing part 32 which is located at a sample motor 2 side, the lubricant heating unit heating the lubricant supplied from the lubricant supplying device 20 to the bearing 32a of the middle shaft bearing parts 32.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotation test apparatus that rotates a specimen such as a motor.

  2. Description of the Related Art A rotation test apparatus that rotates a specimen such as a motor is known. As such a rotation test apparatus, for example, as disclosed in Patent Document 1, a power system test apparatus that rotates the specimen by being rotatably connected to the specimen is known. In this test apparatus, a rotating body and a specimen are rotatably connected via an intermediate shaft.

  By the way, in the shaft system in which the rotating body and the specimen are rotatably connected via the intermediate shaft as described above, the intermediate shaft is generally rotatably supported by a bearing. The bearing is supplied with lubricating oil from the outside.

  As described above, in the configuration in which the lubricating oil is supplied to the bearing that rotatably supports the rotating shaft, for example, as disclosed in Patent Document 2, the temperature of the lubricating oil is adjusted to adjust the temperature of the lubricating oil. It is known that the sliding loss of the bearing can be reduced. In the configuration disclosed in Patent Document 2, an oil heater that controls the temperature of the lubricating oil stored in the head tank on the side surface of the head tank in which the lubricating oil supplied to the bearing by the oil supply device is stored. Is provided.

JP 2014-142317 A JP 2011-122557 A

  In the configuration in which the rotating body and the specimen are rotatably connected via the intermediate shaft as in the configuration disclosed in Patent Document 1, in order to stably support the intermediate shaft in a rotatable manner, In general, the intermediate shaft needs to be rotatably supported by at least two bearings. That is, in the axial direction of the intermediate shaft, the intermediate shaft can be stably and rotatably supported by rotatably supporting the intermediate shaft with the bearing on the rotating body side and the bearing on the specimen side.

  By the way, when the torque generated by the specimen is detected by driving the specimen in a state where the specimen is rotated at a constant speed using the rotational testing apparatus, the rotational body and the intermediate shaft of the rotational testing apparatus are used. It is desirable that the resulting loss be constant. This is because if the loss generated in the rotation test apparatus fluctuates, the torque generated by the specimen cannot be accurately detected.

  As described above, in the case of a configuration in which the intermediate shaft is rotatably supported by at least two bearings, even if the rotation speed of the intermediate shaft is constant, depending on the temperature of the lubricating oil supplied to the bearing, the bearing There is a possibility that the loss incurred will vary. As described above, when the loss generated in the bearing varies, the torque generated by the specimen cannot be accurately detected.

  In addition, as described above, when the intermediate shaft is rotatably supported by at least two bearings on the rotating body side and the specimen side, generally, the temperature of the lubricating oil in the bearing on the rotating body side and the bearing on the specimen side It is different from the temperature of the lubricating oil in That is, when the rotating body rotates, the temperature of the air flowing inward in the axial direction of the intermediate shaft is lower on the specimen side than on the rotating body side. Therefore, the lubricating oil in the bearing on the specimen side is easily cooled. Therefore, even when the lubricating oil adjusted in temperature as in Patent Document 2 is supplied to the bearing on the specimen side and the bearing on the rotating body side, the temperature of the lubricating oil in the bearing on the specimen side is: It is lower than the temperature of the lubricating oil in the bearing on the rotating body side.

  As described above, when the temperature of the lubricating oil is different between the bearing on the specimen side and the bearing on the rotating body side, the viscosity of the lubricating oil in each bearing is different, resulting in a difference in loss generated in each bearing. Then, when the rotation speed of the rotation test apparatus is changed, the loss generated in the intermediate shaft may fluctuate and become unstable, and the torque generated by the specimen cannot be accurately detected.

  According to the present invention, in a rotation test apparatus in which an intermediate shaft that rotatably connects a rotating body and a specimen is rotatably supported by a bearing, the influence of loss caused on the bearing due to a change in temperature of the lubricating oil is reduced. Thereby, the structure which can suppress the fall of the detection accuracy of the torque which the said test body generate | occur | produces is obtained.

  A rotation test apparatus according to an embodiment of the present invention is provided between a rotating body that rotates a specimen and the specimen and the rotating body, and rotatably connects the specimen and the rotating body. An intermediate shaft and a bearing that rotatably supports the intermediate shaft are generated between at least two intermediate bearing portions arranged side by side in the axial direction of the intermediate shaft, and the specimen and the rotating body. A torque detection unit that detects torque and outputs it as a torque signal; a lubricant supply unit that supplies lubricant to the bearings of the at least two intermediate bearing units; and the supply of the at least two intermediate bearing units. A lubricating oil heating unit that is provided in an intermediate bearing portion located on the specimen side and heats the lubricating oil supplied from the lubricating oil supply unit to the bearing of the intermediate bearing portion (first configuration).

  The viscosity of the lubricating oil supplied to the bearing varies with temperature. Therefore, the loss generated in the bearing varies depending on the temperature of the lubricating oil. Specifically, when the temperature of the lubricating oil is high, since the viscosity of the lubricating oil is lower than when the temperature of the lubricating oil is low, the loss generated in the bearing is small. On the other hand, when the temperature of the lubricating oil is low, since the viscosity of the lubricating oil is higher than when the temperature of the lubricating oil is high, the loss generated in the bearing is large.

  As a result of intensive studies on the relationship between the temperature of the lubricating oil and the loss generated in the bearing as described above, the present inventor has found that the temperature of the lubricating oil supplied to the bearing and the loss generated in the bearing with respect to the temperature change of the lubricating oil. We found a relationship with the amount of change.

  FIG. 5 shows the amount of change at each temperature of the lubricating oil. As shown in FIG. 5, when the temperature of the lubricating oil is low, the amount of change in loss generated in the bearing with respect to the temperature change of the lubricating oil is large, while when the temperature of the lubricating oil is high, the temperature of the lubricating oil The amount of change in loss caused by the bearing with respect to the change is small. Therefore, if the temperature of the lubricating oil is high, even if the temperature of the lubricating oil changes, the loss generated in the bearing does not change much. In the example of FIG. 5, for example, by setting the temperature of the lubricating oil to 70 ° C. or more, it is possible to reduce the change in loss generated in the bearing as compared with the case where the temperature of the lubricating oil is low. Therefore, it is preferable to set the temperature of the lubricating oil to a high temperature of 70 ° C. or higher from the viewpoint of suppressing the variation in loss generated in the bearing due to the temperature change of the lubricating oil.

  Further, as described above, the temperature of the lubricating oil in the bearing of the intermediate bearing portion positioned on the specimen side is likely to be lower than that of the bearing of the intermediate bearing portion positioned on the rotating body side.

  In view of the above points, in the above-described configuration, the temperature of the lubricating oil supplied to at least two intermediate bearing portions that rotatably support the intermediate shaft that rotatably connects the rotating body and the specimen is set to 70 degrees or more. At the same time, the lubricating oil supplied to the bearing of the intermediate bearing portion located on the specimen side is heated by the lubricating oil heating unit. Thus, the lubricating oil supplied to the bearing of the intermediate bearing part located on the specimen side is heated by the lubricating oil heating part, thereby reducing the temperature drop of the lubricating oil occurring in the intermediate bearing part located on the specimen side. Can be prevented.

  Thereby, it can prevent that the loss which arises in the bearing of the intermediate bearing part located in a test body side changes largely by the temperature change of the lubricating oil supplied to this bearing. Accordingly, the torque generated by the specimen can be detected with high accuracy.

  The intermediate bearing portion includes a bearing and at least a part of a member that supports the bearing.

  In the first configuration, the intermediate shaft and the at least two intermediate bearing portions are supplied from the lubricant supply portion to the bearings of the at least two intermediate bearing portions in the axial direction of the intermediate shaft. The lubricating oil is configured to move to the center side (second configuration).

  With the rotation of the intermediate shaft, the outside air flows between the intermediate shaft and the intermediate bearing portion, so that the lubricating oil supplied to the bearing of the intermediate bearing portion that rotatably supports the intermediate shaft does not flow out. Move to the center side in the axial direction of the intermediate shaft. When the lubricating oil flows in this manner, the outside air moves together with the lubricating oil to the center side in the axial direction, so that the temperature of the lubricating oil tends to decrease. Therefore, the loss generated in the bearing of the intermediate bearing portion is likely to fluctuate due to the temperature change of the lubricating oil supplied to the bearing. In addition, the temperature of the outside air flowing from the specimen side between the intermediate shaft and the intermediate bearing portion is lower than the temperature of the outside air flowing from the rotating body side between the intermediate shaft and the intermediate bearing portion. For this reason, the temperature of the lubricating oil in the intermediate bearing portion located on the specimen side tends to be lower than the lubricating oil in the intermediate bearing portion located on the rotating body side.

  On the other hand, by applying the first configuration described above, the loss generated in the bearing of the intermediate bearing portion located on the specimen side changes greatly due to the temperature change of the lubricating oil supplied to the bearing. Can be prevented. Accordingly, the torque generated by the specimen can be detected with high accuracy.

  In the first or second configuration, the rotation test apparatus further includes a cover that covers the connecting portion between the rotating body and the intermediate shaft and the torque detecting portion. The lubricating oil heating part is provided in an intermediate bearing part located on the opposite side of the cover in the axial direction of the intermediate shaft of the two intermediate bearing parts, and the lubricating oil is provided to the bearing of the intermediate bearing part. The lubricating oil supplied from the supply unit is heated (third configuration).

  Thus, when the connection part of a rotary body and an intermediate shaft and the torque detection part are covered with the cover, the intermediate | middle located in the said rotary body side among the at least 2 intermediate bearing parts which support the said intermediate shaft rotatably. The cover is located in the vicinity of the bearing portion. For this reason, the temperature of the lubricating oil supplied from the lubricating oil supply unit to the bearing of the intermediate bearing portion is unlikely to decrease. On the other hand, since the specimen is not covered with a cover, it is supplied from the lubricating oil supply section to the intermediate bearing portion located on the opposite side of the cover, that is, the bearing of the intermediate bearing portion located on the specimen side. Lubricating oil is easy to touch the outside air. Therefore, the temperature of the lubricating oil tends to be lower than the lubricating oil supplied to the bearing of the intermediate bearing portion located on the rotating body side.

  On the other hand, as described above, the lubricating oil supplied to the bearing of the intermediate bearing portion located on the opposite side of the cover, that is, the intermediate bearing portion located on the specimen side, is heated with the lubricating oil. By heating by the part, it is possible to suppress the temperature drop of the lubricating oil supplied to the bearing of the intermediate bearing part located on the specimen side.

  Thereby, it can prevent that the loss which arises in the bearing of the intermediate bearing part located in a test body side changes largely by the temperature change of the lubricating oil supplied to this bearing. Accordingly, the torque generated by the specimen can be detected with high accuracy.

  In any one of the first to third configurations, the rotation test apparatus includes the lubricating oil in the intermediate bearing portion in which the lubricating oil is heated by the lubricating oil heating portion of the at least two intermediate bearing portions. A lubricating oil temperature detecting unit for detecting the temperature of the rotating body, a rotating speed detecting unit for detecting the rotating speed of the rotating body, the temperature of the lubricating oil detected by the lubricating oil temperature detecting unit, and the rotating body detecting unit A heating control unit that controls heating of the lubricating oil by the lubricating oil heating unit using the detected rotation speed of the rotating body is further provided (fourth configuration).

  As a result, the temperature of the lubricating oil supplied to the bearing of the intermediate bearing portion located on the specimen side can be quickly changed according to the lubricating oil temperature detected by the lubricating oil temperature detecting portion and the rotational speed of the rotating body. Can be adjusted.

  Here, the temperature of the lubricating oil of the bearing increases as the rotational speed of the intermediate shaft increases. If the temperature of the lubricating oil becomes too high, the viscosity of the lubricating oil is greatly reduced, affecting the characteristics and durability of the bearing. Therefore, it is desirable that the temperature of the lubricating oil does not become too high.

  Therefore, as described above, by adjusting the temperature of the lubricating oil in accordance with the temperature of the lubricating oil detected by the lubricating oil temperature detection unit and the rotational speed of the rotating body, the fluctuation of the loss generated in the bearing can be reduced. The temperature can be quickly adjusted to an appropriate temperature range that can be suppressed.

  In the fourth configuration, the heating control unit sets a heating amount that reduces a difference between the temperature of the lubricating oil detected by the lubricating oil temperature detecting unit and a target temperature of the lubricating oil to the rotating body. Correction according to the rotation speed is performed, and heating of the lubricating oil by the lubricating oil heating unit is controlled based on the corrected heating amount (fifth configuration).

  Thereby, the temperature of the lubricating oil supplied to the bearing of the intermediate bearing portion located on the specimen side can be quickly adjusted to the target temperature of the lubricating oil.

  In the fourth configuration, the heating control unit includes a temperature of lubricating oil supplied to a bearing of an intermediate bearing unit located on the rotating body side among the at least two intermediate bearing units, and the lubricating oil temperature detecting unit. The amount of heating so that the difference between the detected temperature of the lubricating oil is reduced is corrected according to the rotational speed of the rotating body, and based on the corrected amount of heating, the amount of lubricating oil by the lubricating oil heating unit is corrected. Heating is controlled (sixth configuration).

  Thereby, the temperature of the lubricating oil supplied to the bearing of the intermediate bearing part located on the specimen side can be brought close to the temperature of the lubricating oil supplied to the bearing of the intermediate bearing part located on the rotating body side. Therefore, even when the rotational speed of the intermediate shaft changes, the fluctuation in loss caused by the bearing that rotatably supports the intermediate shaft is greatly different between the intermediate bearing portion on the specimen side and the intermediate bearing portion on the rotating body side. Can be prevented. Thus, the torque generated by the specimen can be detected with high accuracy.

  According to the rotation test apparatus according to an embodiment of the present invention, among the at least two intermediate bearing portions that rotatably support the intermediate shaft that rotatably connects the specimen and the rotating body, the rotational testing apparatus is located on the specimen side. The intermediate bearing portion is provided with a lubricating oil heating portion that heats the lubricating oil supplied to the bearing of the intermediate bearing portion. Thereby, it can prevent that the loss which arises in the bearing of the intermediate bearing part located in the said test body side changes largely by the temperature change of the lubricating oil supplied to this bearing. Accordingly, the torque generated by the specimen can be detected with high accuracy.

FIG. 1 is a block diagram illustrating a schematic configuration of the vehicle test apparatus according to the first embodiment. FIG. 2 is a diagram schematically illustrating a configuration of the bearing support portion and a state in which the lubricating oil is supplied to the bearing of the intermediate bearing portion. FIG. 3 is a view of the bearing support portion as viewed from the test motor side. FIG. 4 is a control block diagram of the heating control device. FIG. 5 is a diagram showing the relationship between the lubricating oil temperature and the change in loss generated in the bearing with respect to the change in the lubricating oil temperature. 6 is a view corresponding to FIG. 2 of the vehicle test apparatus according to the second embodiment. FIG. 7 is a view corresponding to FIG. 3 of the vehicle test apparatus according to the second embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the dimension of the structural member in each figure does not represent the dimension of an actual structural member, the dimension ratio of each structural member, etc. faithfully.

<Embodiment 1>
(overall structure)
FIG. 1 is a block diagram illustrating a schematic configuration of a vehicle test apparatus 1 (rotational test apparatus) according to the first embodiment. The vehicular test apparatus 1 is a test apparatus for obtaining various measurement data of the test motor 2 in a state in which the test motor 2 that is a specimen is rotated.

  The vehicular test apparatus 1 is generated in a dynamo 11 (rotary body) that is drivingly connected to the test motor 2, an intermediate shaft 31 that rotatably connects the test motor 2 and the dynamo 11, and the test motor 2. And a torque meter 41 (torque detector) for detecting torque. Reference numeral 3 in FIG. 1 denotes a motor control device that controls driving of the test motor 2.

  The motor control device 3 controls the torque of the test motor 2 by supplying power to the test motor 2 in accordance with the input torque command. Since the configuration of the motor control device 3 has the same configuration as a control device such as a conventional inverter, detailed description thereof is omitted.

  In the present embodiment, an example of the vehicle test apparatus 1 is given as the rotation test apparatus, but a test apparatus for other applications may be used.

  The dynamo 11 is an electric motor, and the rotation speed is controlled. Since the configuration of the dynamo 11 is the same as that of a general electric motor, detailed description thereof is omitted. The dynamo 11 is provided with a rotation speed sensor 12 (rotation speed detector) for detecting the rotation speed of a rotor (not shown).

  The rotor of the dynamo 11 is connected to the rotating shaft (not shown) of the test motor 2 via the intermediate shaft 31. Although not particularly shown, the rotor of the dynamo 11 and the intermediate shaft 31 are drivingly connected by coupling the couplings provided on both of them together with bolts. Similarly, the intermediate shaft 31 and the rotating shaft of the test motor 2 are also drive-coupled by coupling the couplings with bolts.

  The intermediate shaft 31 is provided with a torque meter 41 for detecting torque generated between the dynamo 11 and the test motor 2. The torque meter 41 detects a difference in torsion angle generated in the intermediate shaft 31. The torque meter 41 obtains torque generated in the intermediate shaft 31 from the detected difference in torsion angle and outputs it as a torque signal. A 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 is rotatably supported by intermediate bearing portions 32 and 33 at two locations in the axial direction. The intermediate bearing portions 32 and 33 rotatably support a portion between the torque meter 41 and the test motor 2 on the intermediate shaft 31. That is, the intermediate bearing portions 32 and 33 rotatably support the test motor 2 side in the intermediate shaft 31. The torque meter 41 is disposed between the dynamo 11 and the intermediate bearing portions 31 and 32.

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

  As shown in FIG. 2, the intermediate bearing portion 32 includes a bearing 32a. The intermediate bearing portion 33 has a bearing 33a.

  The bearings 32 a and 33 a are supported by a bearing support portion 34. The bearing support portion 34 includes a cylindrical member that supports the bearings 32a and 33a while the intermediate shaft 31 penetrates in the cylinder axis direction. Of the cylindrical member of the bearing support portion 34, the portions that support the bearings 32 a and 33 a constitute part of the intermediate bearing portions 32 and 33. In other words, the intermediate bearing portion 32 includes a bearing 32 a and a portion of the bearing support portion 34 that supports the bearing 32 a. The intermediate bearing portion 33 includes a bearing 33 a and a portion of the bearing support portion 34 that supports the bearing 33 a. The bearing support portion 34 is supported by a base 1a described later.

  Further, as shown in FIG. 1, a portion of the intermediate shaft 31 between the bearing support portion 34 and the dynamo 11 is covered with a cover 36. That is, the connecting portion between the rotor of the dynamo 11 and the intermediate shaft 31 and the torque meter 41 are covered with the cover 36. The bearing support portion 34 is adjacent to the cover 36 on the dynamo 11 side.

  In the vehicle test apparatus 1, the dynamo 11, the torque meter 41, and the intermediate bearing portions 32 and 33 are supported by a base 1a. Further, the test motor 2 is fixed to a motor fixing portion 1b provided on the base 1a.

  As shown in FIG. 2, the lubricating oil is supplied to the bearings 32 a and 33 a of the intermediate bearing portions 32 and 33 by the lubricating oil supply device 20. That is, the bearing support portion 34 is provided with a lubricating oil supply path (not shown) for supplying lubricating oil to the bearings 32a and 33a. 1 to 3 schematically show a flow of lubricating oil from the lubricating oil supply device 20 to the bearings 32a and 33a by a one-dot chain line. In FIG. 2, the description of the flow of the lubricating oil from the bearings 32a and 33a to the lubricating oil supply device 20 is omitted. In FIG. 3, the description of the lubricating oil supply device 20 is omitted, and only the flow of the lubricating oil around the bearing 32a is illustrated.

  As shown in FIG. 2, the intermediate bearing portions 32 and 33 are configured such that lubricating oil is supplied to the bearings 32 a and 33 a from the outside in the axial direction of the intermediate shaft 31 toward the inside. . Further, the intermediate shaft 31 has a larger outer diameter at a portion positioned inward than an outer diameter at a portion positioned outward of the intermediate bearing portions 32 and 33 in the axial direction. Thereby, during the rotation of the intermediate shaft 31, the lubricating oil supplied to the bearings 32a and 33a flows inward in the axial direction of the intermediate shaft 31 with respect to the bearings 32a and 33a.

  As shown in FIG. 1, the vehicle test apparatus 1 includes a lubricating oil supply device 20 that supplies lubricating oil to bearings 32 a and 33 a of the intermediate bearing portions 32 and 33, respectively. The lubricating oil supply device 20 includes a pump 21 that discharges lubricating oil, a temperature adjusting unit 22 that adjusts the temperature of the lubricating oil, and a lubricating oil control unit 24 that controls driving of the pump 21 and the temperature adjusting unit 22. .

  Although not specifically illustrated, the temperature adjusting unit 22 includes at least one of a heater and a cooler so that the temperature of the lubricating oil can be adjusted. That is, the temperature adjusting unit 22 may include only a heater that heats the lubricating oil, may include only a cooler that cools the lubricating oil, or both the heater and the cooler. You may have. Although detailed description is omitted, the temperature adjusting unit 22 may cool the lubricating oil stored in the tank at a high temperature by using a cooler so that the temperature of the lubricating oil becomes a desired temperature.

  The lubricating oil control unit 24 adjusts the amount of lubricating oil supplied to the bearings 32a and 33a by controlling the driving of the pump 21, and the lubricating oil detected by the lubricating oil temperature detecting unit 38 to be described later. The temperature of the lubricating oil is adjusted by controlling the driving of the temperature adjusting unit 22 according to the temperature Tb.

  Specifically, the lubricating oil control unit 24 drives the pump 21 so that a predetermined amount of lubricating oil is supplied to the bearings 32a and 33a, and also inputs the lubricating oil temperature command and the rotational speed of the dynamo 11. The temperature of the lubricating oil is adjusted according to N.

  By controlling the driving of the temperature adjusting unit 22 by the lubricating oil control unit 24 having the above-described configuration, the lubricating oil discharged from the lubricating oil supply device 20 is adjusted to a desired temperature. Lubricating oil adjusted to a desired temperature is supplied to the bearings 32a and 33a.

  The intermediate bearing portion 32 is provided with a lubricating oil heating portion 35 for heating the lubricating oil supplied to the bearing 32a. As shown in FIGS. 2 and 3, the lubricating oil heating unit 35 includes a plurality of (eight in the present embodiment) heaters arranged in the circumferential direction so as to surround the bearing 32 a inside the bearing support 34. 35a. Each heater 35 a has a rod shape and is disposed in the bearing support portion 34 so as to extend in the axial direction of the intermediate shaft 31. Each heater 35a is controlled to be heated by a heating control device 50 (heating control unit).

  The shape of the heater 35a may be a shape other than a rod shape as long as the lubricating oil supplied to the bearing 32a can be heated. Further, the lubricating oil heating unit 35 may have a heating device other than the heater as long as the lubricating oil supplied to the bearing 32a can be heated.

  As shown in FIG. 2, the intermediate bearing portion 32 is provided with a lubricating oil temperature detector 37 that detects the temperature Tbs of the lubricating oil of the bearing 32 a. Further, the intermediate bearing portion 33 is provided with a lubricating oil temperature detecting portion 38 for detecting the lubricating oil temperature Tb of the bearing 33a.

  The heating control device 50 heats the lubricating oil supplied to the bearing 32 a based on the lubricating oil temperature command Tbref (target temperature) and the rotation speed of the intermediate shaft 31. The heating control device 50 brings the lubricating oil temperature Tbs detected by the lubricating oil temperature detection unit 37 closer to the lubricating oil temperature command Tbref, and the rotational speed N of the intermediate shaft 31, that is, the rotational speed N output from the rotational speed sensor 12. In consideration of the above, heating control is performed.

  Specifically, the heating control device 50 includes a temperature difference calculation unit 51, a temperature correction unit 52, and a heating amount calculation unit 53. The temperature difference calculating unit 51 calculates the difference between the lubricating oil temperature Tbs detected by the lubricating oil temperature detecting unit 37 and the lubricating oil temperature command Tbref. That is, the temperature difference calculation unit 51 calculates a temperature increase necessary for adjusting the temperature Tbs of the lubricating oil of the bearing 32a to the lubricating oil temperature command Tbref.

  The temperature correction unit 52 includes a correction table for the temperature of the lubricating oil corresponding to the rotation speed N output from the rotation speed sensor 12, and the temperature difference calculated by the temperature difference calculation unit 51 is used as the correction table. To correct.

  Here, the temperature of the lubricating oil supplied to the bearing 32 a changes according to the rotational speed N of the intermediate shaft 31. That is, the temperature of the lubricating oil supplied to the bearing 32a is higher when the rotation speed of the intermediate shaft 31 is higher than when the rotation speed of the intermediate shaft 31 is low. Therefore, the amount of heating necessary for the heater 35a to change the temperature of the lubricating oil supplied to the bearing 32a to a desired temperature varies depending on the rotational speed N of the intermediate shaft 31.

  In the temperature correction unit 52, in order to obtain the heating amount necessary for the heater 35a that changes according to the rotation speed of the intermediate shaft 31 as described above, the temperature difference calculated by the temperature difference calculation unit 51 is set to the rotation speed. Add the correct correction amount.

  The heating amount calculation unit 53 calculates the heating amount (heating control amount) of the heater 35a from the correction value of the temperature difference obtained by the temperature correction unit 52, and generates a control signal corresponding to the heating amount. In response to the control signal generated by the heating amount calculation unit 53, the heater 35a is controlled to be heated.

  A specific control block diagram of the heating control device 50 is shown in FIG. As shown in FIG. 4, the temperature difference calculation unit 51 includes a subtractor 51a that calculates a temperature difference between the lubricant temperature Tbs detected by the lubricant temperature detection unit 37 and the lubricant temperature command Tbref, and a subtractor 51a. And a calculator 51b that performs PID calculation using the temperature difference calculated by the above. That is, the temperature difference calculation unit 51 feeds back the temperature difference between the lubricating oil temperature Tbs and the lubricating oil temperature command Tbref in the bearing 32a of the intermediate bearing 32 in the heating control of the heater 35a.

  The temperature correction unit 52 calculates the temperature correction amount from the table based on the rotation speed N output from the rotation speed sensor 12, and the temperature correction amount calculated by the correction amount calculation unit 52a as the temperature correction amount. And an adder 52b for adding to the result calculated by the calculator 51b of the difference calculating unit 51. That is, the temperature correction unit 52 corrects the feedback amount calculated by the temperature difference calculation unit 51 using the temperature correction amount corresponding to the rotation speed N in the heating control of the heater 35a.

  Thus, the heating control device 50 controls the heating of the heater 35a so that the temperature Tbs of the lubricating oil in the bearing 32a of the intermediate bearing 32 approaches the lubricating oil temperature command Tbref while considering the rotational speed N of the intermediate shaft 31. It can be carried out.

  Here, when the rotation speed of the intermediate shaft 31 is constant, the viscosity of the lubricating oil changes when the temperature of the lubricating oil in the bearings 32a and 33a changes. Therefore, when the temperature of the lubricating oil changes, the loss generated in the bearings 32a and 33a changes. Therefore, when the temperature of the lubricating oil changes, the vehicle test apparatus 1 cannot accurately detect the output torque of the test motor 2, and thus the efficiency of the test motor 2 cannot be measured with high accuracy.

  As a result of intensive studies on the relationship between the temperature of the lubricating oil and the loss generated in the bearing, the present inventor has shown that the change in the loss generated in the bearing with respect to the change in the temperature of the lubricating oil is as shown in FIG. The point which changes with the temperature of was found. That is, when the temperature of the lubricating oil is relatively high, the inventor of the present invention changes the loss DT generated in the bearing with respect to the temperature change of the lubricating oil (= change in loss generated in the bearing / temperature change in the lubricating oil). Was found to be smaller. Specifically, as shown in FIG. 5, when the temperature of the lubricating oil is 70 ° C. or higher, the change in loss generated in the bearing with respect to the temperature change of the lubricating oil, compared to the case where the temperature is lower than that. The amount is smaller. Therefore, the temperature of the lubricating oil in the bearings 32a and 33a of the intermediate bearings 32 and 33 is preferably 70 degrees or more. Note that the temperature of the lubricating oil in the bearing is preferably 95 degrees or less in consideration of the deterioration of the lubricating oil and the durability of the bearing.

  Therefore, in the vehicle test apparatus 1 of the present embodiment, the lubricant temperature command is a temperature command such that the temperature of the lubricant supplied to the bearings 32a and 33a is 70 degrees or higher.

  By the way, in the intermediate bearing portions 32 and 33 of the vehicle test apparatus 1, in the state where the intermediate shaft 31 is rotated, the lubricating oil supplied to the bearings 32a and 33a is combined with the outside air as the shaft of the intermediate shaft 31 as shown in FIG. Move inward in the direction. Thereby, since the said lubricating oil is cooled with external air, the temperature of the said lubricating oil tends to fall.

  In particular, the intermediate bearing portion 32 located on the test motor 2 side of the intermediate bearing portions 32 and 33 is more easily contacted with the outside air than the intermediate bearing portion 33 in which the cover 36 is disposed on the dynamo 11 side. The temperature of the lubricating oil tends to decrease. Therefore, the temperature of the lubricating oil supplied to the intermediate bearing portion 32 located on the test motor 2 side is likely to be lower than the temperature of the lubricating oil supplied to the intermediate bearing portion 33 located on the dynamo 11 side.

  On the other hand, as in the present embodiment, the lubricating oil supplied to the bearing 32a of the intermediate bearing portion 32 located on the test motor 2 side is heated by the heater 35a of the lubricating oil heating portion 35, whereby the intermediate bearing. The temperature difference of the lubricating oil in the bearings 32a and 33a of the parts 32 and 33 can be reduced. In addition, the temperature of the lubricating oil can be set to a relatively high temperature so that the loss generated in the bearings 32a and 33a of the intermediate bearings 32 and 33 is not easily affected by the temperature of the lubricating oil.

  As a result, even when the rotational speed of the vehicle test apparatus 1 changes abruptly or when the vehicle test apparatus 1 is started, the loss generated in the bearings 32a and 33a of the intermediate bearings 32 and 33 greatly changes due to the influence of the temperature change of the lubricating oil. Can be suppressed. Therefore, the vehicle test apparatus 1 can quickly and accurately measure the efficiency of the test motor 2.

<Embodiment 2>
FIG. 6 shows an enlarged view of the bearing support portion of the vehicle test apparatus according to the second embodiment. As shown in FIG. 6, the configuration of the second embodiment causes the heating controller 150 to output the lubricating oil temperature detection units 37 and 38, that is, the lubricating oil temperature Tbs in the bearings 32 a and 33 a of the intermediate bearings 32 and 33, It differs from the configuration of the first embodiment in that Tb is input. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only components different from those in the first embodiment are described.

  FIG. 7 shows a control block diagram of the heating control device 150. As shown in FIGS. 6 and 7, the temperature difference calculation unit 151 of the heating control device 150 receives the temperatures Tbs and Tb of the lubricating oil in the bearings 32 a and 33 a of the intermediate bearing units 32 and 33. Lubricating oil temperatures Tbs and Tb are detected by lubricating oil temperature detectors 37 and 38. In the temperature difference calculation unit 151, after the temperature difference between the temperature Tbs of the lubricating oil in the bearing 32 a of the intermediate bearing portion 32 and the temperature Tb of the lubricating oil in the bearing 33 a of the intermediate bearing portion 33 is obtained by the subtractor 151 a, 1, the temperature difference is subjected to PID calculation by the calculator 51 b.

  The result calculated by the temperature difference calculation unit 151 is corrected by the temperature correction unit 52 with a correction value corresponding to the rotation speed of the intermediate shaft 31 as in the first embodiment. Thereafter, the heating amount calculation unit 53 calculates a heating amount based on the value corrected by the temperature correction unit 52, and generates a control signal for controlling the heating of the heater 35a. The heater 35 a is controlled to be heated according to the control signal generated by the heating amount calculation unit 53.

  In the present embodiment, the heating control device 150 generates a control signal for the heater 35a using the temperature difference between the lubricating oil temperatures Tbs and Tb detected by the lubricating oil temperature detectors 37 and 38. Thereby, the drive of the heater 35a is controlled so that the temperature of the lubricating oil in the bearing 32a of the intermediate bearing portion 32 on the side of the test motor 2 approaches the temperature of the lubricating oil in the bearing 33a of the intermediate bearing portion 33 on the dynamo 11 side. Is done.

  Therefore, the change in loss caused by the bearing is relatively different between the temperature of the lubricating oil in the bearing 32a of the intermediate bearing portion 32 on the test motor 2 side and the temperature of the lubricating oil in the bearing 33a of the intermediate bearing portion 33 on the dynamo 11 side. It becomes possible to adjust to a small temperature. Therefore, even when the rotational speed of the vehicular test apparatus is changed, it is possible to suppress a change in loss caused by the bearings 32a and 33a, and to measure the efficiency of the test motor 2 quickly and accurately.

(Other embodiments)
While the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiment, and the above-described embodiment can be appropriately modified and implemented without departing from the spirit of the invention.

  In each said embodiment, the motor control apparatus 3 controls the torque of the test motor 2 by supplying electric power to the test motor 2 according to the input torque command. Further, the rotational speed of the dynamo 11 is controlled. However, the rotational speed of the test motor may be controlled, and the dynamo torque may be controlled.

  In each of the above-described embodiments, the lubricating oil heating part 35 for heating the lubricating oil supplied to the bearing 32a is provided in the intermediate bearing part 32 located on the specimen side among the intermediate bearing parts 32 and 33. . However, among the plurality of intermediate bearing portions, the lubricating oil heating portion may be provided in the intermediate bearing portion in which the temperature of the lubricating oil in the bearing tends to decrease.

  In each of the above-described embodiments, the intermediate shaft 31 is rotatably supported by the intermediate bearing portions 32 and 33. However, the intermediate shaft 31 may be rotatably supported by three or more intermediate bearing portions. In this case, it is preferable to provide the lubricating oil heating part in the intermediate bearing part among the plurality of intermediate bearing parts, in which the temperature of the lubricating oil in the bearing tends to decrease.

  In each said embodiment, the intermediate bearing parts 32 and 33 have the bearings 32a and 33a, respectively. However, each of the intermediate bearing portions may have two or more bearings.

  In each of the above embodiments, the intermediate bearing portion 32 is provided with eight heaters 35a. However, the number of heaters provided in the intermediate bearing portion 32 may be other than eight as long as the lubricating oil supplied to the bearing 32a can be heated.

  In each of the embodiments, a part of the intermediate shaft 31 is covered with the cover 36. However, the intermediate shaft 31 may not be covered with the cover 36.

  In each of the embodiments described above, the supplied lubricating oil flows inward in the axial direction of the intermediate shaft 31 in the bearings 32 a and 33 a of the intermediate bearing portions 32 and 33. However, the lubricating oil flowing in the bearing may flow outward in the axial direction of the intermediate shaft 31 or may flow downward as it is without flowing in the axial direction.

  In each of the embodiments described above, the heating control devices 50 and 150 obtain the heating amount of the heater 35a in consideration of the rotational speed N of the intermediate shaft 31. However, the heating control device does not have to consider the rotational speed N of the intermediate shaft 31 when obtaining the heating amount of the heater 35a. Further, the heating control device may consider parameters (such as the outside air temperature) other than the rotation speed N of the intermediate shaft 31 when determining the heating amount of the heater 35a. Furthermore, the heating control devices 50 and 150 may control the heating of the heater 35a so that the temperature of the lubricating oil in the bearing 32a of the intermediate bearing portion 32 becomes a preset temperature.

  The rotation test apparatus according to the present invention can be used for 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 testing equipment (rotational testing equipment)
2 Test motor (specimen)
11 Dynamo (Rotating body)
12 Rotational speed sensor (Rotational speed detector)
20 Lubricating oil supply device (lubricating oil supply unit)
21 Pump 22 Temperature adjusting unit 24 Lubricating oil control unit 31 Intermediate shafts 32 and 33 Intermediate bearing units 32a and 33a Bearing 34 Bearing support unit 35 Lubricating oil heating unit 35a Heater 36 Covers 37 and 38 Lubricating oil temperature detecting unit 41 Torque detecting unit 50 , 150 Heating control device (heating control unit)
51, 151 Temperature difference calculation unit 52 Temperature correction unit 53 Heating amount calculation unit

Claims (6)

A rotating body that rotates the specimen;
An intermediate shaft that is provided between the specimen and the rotating body and rotatably connects the specimen and the rotating body;
A bearing for rotatably supporting the intermediate shaft, and at least two intermediate bearing portions arranged side by side in the axial direction of the intermediate shaft;
A torque detector that detects torque generated between the specimen and the rotating body and outputs a torque signal;
A lubricating oil supply section that respectively supplies lubricating oil to the bearings of the at least two intermediate bearing sections;
Lubricating oil heating section that is provided in an intermediate bearing section located on the specimen side of the at least two intermediate bearing sections and that heats the lubricating oil supplied from the lubricating oil supply section to the bearing of the intermediate bearing section When,
A rotation test apparatus. The rotation test apparatus according to claim 1,
In the axial direction of the intermediate shaft, the intermediate shaft and the at least two intermediate bearing portions move the lubricating oil supplied from the lubricating oil supply portion to the bearings of the at least two intermediate bearing portions toward the center side. A rotation testing device configured to: The rotation test apparatus according to claim 1 or 2,
A cover that covers the connecting portion between the rotating body and the intermediate shaft and the torque detector;
The lubricating oil heating part is provided in an intermediate bearing part located on the opposite side of the cover in the axial direction of the intermediate shaft of the two intermediate bearing parts, and the lubricating oil is provided to the bearing of the intermediate bearing part. A rotation test device that heats lubricating oil supplied from a supply unit. In the rotation test device according to any one of claims 1 to 3,
A lubricating oil temperature detection unit for detecting a temperature of the lubricating oil in the intermediate bearing unit in which the lubricating oil is heated by the lubricating oil heating unit among the at least two intermediate bearing units;
A rotational speed detector for detecting the rotational speed of the rotating body;
The heating of the lubricating oil by the lubricating oil heating unit is controlled using the temperature of the lubricating oil detected by the lubricating oil temperature detecting unit and the rotational speed of the rotating body detected by the rotational speed detecting unit. A heating control unit;
A rotation test apparatus further comprising: The rotation test apparatus according to claim 4, wherein
The heating control unit corrects a heating amount so as to reduce a difference between the temperature of the lubricating oil detected by the lubricating oil temperature detecting unit and a target temperature of the lubricating oil according to a rotation speed of the rotating body. A rotation test apparatus that controls heating of the lubricating oil by the lubricating oil heating unit based on the corrected heating amount. The rotation test apparatus according to claim 4, wherein
The heating control unit includes the temperature of the lubricating oil supplied to the bearing of the intermediate bearing portion located on the rotating body side of the at least two intermediate bearing portions, and the lubricating oil detected by the lubricating oil temperature detection unit. A rotation test that corrects the amount of heating so as to reduce the difference from the temperature according to the rotation speed of the rotating body, and controls the heating of the lubricating oil by the lubricating oil heating unit based on the corrected amount of heating. apparatus.

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