JP2023122909A - Dynamic torque measuring device and dynamic torque measuring method - Google Patents

Abstract

To provide a dynamic torque measuring device and a dynamic torque measuring method with which, even when the revolution speed of a rotating side member constantly changes, it is possible to measure the dynamic torque due to co-rotation occurring to a fixed side member with good accuracy, and to measure, by one round of measurement, the total dynamic torque of a pair of measurement objects mutually differing in the direction of rotation.SOLUTION: A dynamic torque measuring device 10 comprises: a pair of support mechanisms 20A, 20B that have rotary housings 22A, 22B and support shafts 23A, 23B for supporting first members 12A, 12B of a pair of measurement objects 11A, 11B; a drive mechanism 25 that rotationally drives the pair of first members 12A, 12B; a co-rotation unit 31 that co-rotates together with a pair of second members 13A, 13B; a static pressure pad 32 that rotatably supports the co-rotation unit 31, and to which a radial load is applied; and a pair of load rods 33A, 33B that apply an axial load to the pair of measurement objects 11A, 11B. The total dynamic torque acting upon the pair of measurement objects 11A, 11B is given by measuring the tangential force occurring to the co-rotation unit 31.SELECTED DRAWING: Figure 1

Description

The present invention relates to a dynamic torque measuring device and a dynamic torque measuring method.

In recent years, demand for fuel efficiency in vehicles has increased, and dynamic torque measurement in fuel efficiency measurement modes such as the JC08 mode and WLTC mode, which are closer to actual vehicle running, has been adopted. For this reason, hub unit bearings incorporated in vehicles as wheel support bearings are also required to measure dynamic torque in these fuel consumption measurement modes.

In the dynamic torque measurement of the hub unit bearing in these fuel consumption measurement modes, the linear load (half the axle load + canvas thrust) is input to the hub unit bearing, which is the object to be measured, and the rotation speed (vehicle speed) of the rotating side member is also measured. It has to change from time to time. The load input to the object to be measured can be input to one side (stationary member) or the other side (rotary member) of the object to be measured through the bearing, based on the relationship between action and reaction. The dynamic torque due to co-rotation is the torque consumed by the frictional resistance of the object to be measured.

In Patent Documents 1 and 2, one side of the object to be measured is supported by a bearing (a static pressure bearing or a rolling bearing loaded with a load equivalent to its own weight) that has a sufficiently low frictional resistance against the friction torque to be measured. , a dynamic torque detection device is disclosed which rotationally drives the other of the objects to be measured and measures the co-rotating torque of one of the objects to be measured as a tangential force.

JP-A-11-64134 JP 2014-224546 A

By the way, the moment of inertia of the co-rotation part, which co-rotates with the fixed-side member, is not a problem in the case of dynamic torque measurement at a constant rotational speed, but if the dynamic torque is measured in the fuel consumption measurement mode, the rotational-side member Since the rotational speed of the motor changes moment by moment, that is, the transitional period continues, the inertia torque generated by the moment of inertia of the stationary member causes an error in the dynamic torque measurement. Therefore, in the dynamic torque measurement in the fuel consumption measurement mode, it is required that the moment of inertia of the co-rotating portion is minimized so that the stationary member follows the change in rotational speed of the rotating member without delay.

In both of the torque detection devices described in Patent Documents 1 and 2, when the other of the objects to be measured is rotated at a predetermined speed and in a predetermined direction, a drag torque or a tangential force ( However, the moment of inertia of the torque measuring member and the outer housing, which rotate together with one of the objects to be measured, is not considered. That is, in Patent Document 1, a torque measuring member that rotates together with one of the objects to be measured is provided with a pair of arms extending radially outward and preload adjusting means. Further, in Patent Document 2, an outer housing that rotates together with one of the objects to be measured is rotatably supported via two support bearings arranged radially with respect to a rotation shaft that rotates the other of the objects to be measured. Therefore, the diameter of the outer housing is increased. Therefore, in any case, the moment of inertia of the torque measuring member and the outer housing, which rotate together with one of the objects to be measured, is large, and further improvement is required for application to dynamic torque measurement in the fuel efficiency measurement mode, in which the vehicle speed changes from moment to moment. be done. Moreover, neither of Patent Documents 1 and 2 describes at all how to apply an external load to the object to be measured.

In addition, the dynamic torque of the hub unit bearing slightly differs depending on the direction of rotation due to unavoidable manufacturing factors such as machining lines. Since the right and left wheels of the hub unit bearing rotate in different directions, it is necessary to calculate the dynamic torque for clockwise and counterclockwise rotation in order to accurately reflect the measured dynamic torque in fuel efficiency. On the other hand, the direction of rotation must be changed and the measurement must be performed twice, leaving room for improvement from the viewpoint of work efficiency.

The present invention has been made in view of the above-mentioned problems, and its object is to reduce the dynamic torque generated by the co-rotation of the stationary member even in a state where the rotation speed of the rotating member changes from moment to moment. is accurately measured, and the total dynamic torque of a pair of objects to be measured whose rotation directions are different from each other can be measured in one measurement.

The above objects of the present invention are achieved by the following configurations.
[1] A dynamic torque measuring device for measuring dynamic torque of a pair of objects to be measured each having a stationary member and a rotating member rotatable relative to the stationary member,
A pair of rotary housings each having a rotating housing that holds a first member that is one of the fixed side member and the rotating side member of the pair of objects to be measured, and a support shaft that supports the rotating housing via a rolling bearing. a support mechanism;
a driving mechanism that rotationally drives the pair of first members via the respective rotating housings;
A second member disposed between the pair of support mechanisms, which is the other of the fixed-side member and the rotary-side member of the pair of objects to be measured, is held. a co-rotating portion co-rotating together with the second member of
a static pressure pad that rotatably supports the co-rotating portion and receives a radial load;
A pair of load rods connected to the support shaft on the side opposite to the co-rotating portion with respect to each of the pair of support mechanisms and applying an axial load to the pair of first members via the pair of support mechanisms. and,
with
The total dynamic torque acting on the pair of objects to be measured is given by measuring the tangential force generated in the co-rotating part,
Dynamic torque measuring device.

[2] A dynamic torque measuring method using the dynamic torque measuring device according to [1],
With the load applied to the co-rotating portion and the pair of load rods, the first member is rotationally driven, and the tangential force generated in the co-rotating portion is measured. A dynamic torque measurement method that measures the total dynamic torque acting.

According to the dynamic torque measuring device and the dynamic torque measuring method of the present invention, the dynamic torque due to co-rotation generated in the stationary member can be accurately measured even in a state where the rotation speed of the rotating member changes moment by moment. It is possible to measure the total dynamic torque of a pair of objects rotating in different directions in one measurement.

FIG. 1 is a schematic diagram showing the configuration of a dynamic torque measuring device according to a first embodiment of the present invention. FIG. 2 is a schematic diagram showing the configuration of a dynamic torque measuring device according to a modification of the first embodiment. FIG. 3 is a schematic diagram showing the configuration of a dynamic torque measuring device according to a second embodiment of the present invention. FIG. 4 is a schematic diagram showing the configuration of a dynamic torque measuring device according to a modification of the second embodiment. FIG. 5 is a schematic diagram showing the configuration of a dynamic torque measuring device according to a third embodiment of the present invention.

Hereinafter, each embodiment of the dynamic torque measuring device according to the present invention will be described in detail based on the drawings.
(First embodiment)
As shown in FIG. 1, in this embodiment, a pair of hub unit bearings 11A and 11B are used as objects to be measured. That is, the rotating members of the object to be measured are the hub wheels 12A and 12B of the hub unit bearings 11A and 11B to which the wheels of the vehicle are attached, and the stationary members of the object to be measured are attached to the suspension system of the vehicle. These are flanged outer rings 13A and 13B of hub unit bearings 11A and 11B. Then, the dynamic torque measuring device 10 of the present embodiment is based on the co-rotation generated in the pair of flanged outer rings 13A and 13B in the pair of hub unit bearings 11A and 11B when the pair of hub wheels 12A and 12B are rotated. The total dynamic torque is measured in one measurement.

The dynamic torque measuring device 10 includes a pair of support mechanisms 20A, 20B for supporting hub wheels 12A, 12B in hub unit bearings 11A, 11B having hub wheels 12A, 12B and flanged outer rings 13A, 13B.

The pair of support mechanisms 20A, 20B is a pair of rotary housings 22A, 22B connected to the rotary flanges 14A, 14B of the hub wheels 12A, 12B, which are first members, respectively, and the rotary housings 22A, 22B are combined back to back. A pair of support shafts 23A, 23B rotatably supported via a plurality of angular ball bearings 21A, 21B are provided.

In addition, the dynamic torque measuring device 10 includes a drive motor 26, a pair of pulleys 27A and 27B fixed to a rotary shaft 26a of the drive motor 26, and a pair of pulleys 28A and 28B fixed to rotary housings 22A and 22B. It comprises a drive mechanism 25 having belts 29A, 29B wrapped around it. By rotationally driving the rotary housings 22A and 22B by the driving motor 26, the pair of hub wheels 12A and 12B are rotationally driven at the same speed.

Between the pair of support mechanisms 20A and 20B, corotating portions 31 to which the outer ring flanges 15A and 15B of the flanged outer rings 13A and 13B, which are the second members, are fixed are arranged on both sides in the axial direction. The co-rotating portion 31 is rotatably supported by the static pressure pad 32 in a non-contact and rotational resistance-free state. The co-rotating portion 31 supports the two flanged outer rings 13A and 13B, and is made of a light metal material such as aluminum, or formed into a cylindrical shape for weight reduction. has a smaller moment of inertia.

In this specification, the state in which there is no rotational resistance does not necessarily mean that the rotational resistance is zero. It means that the rotational resistance is sufficiently small (for example, 1/100 or less) relative to the size, and the resistance is low enough not to affect the dynamic torque measurement of the hub unit bearings 11A and 11B.

A radial load P1 is applied by a hydraulic cylinder 38 via a hydrostatic pad 32 to the corotating portion 31 and the pair of flanged outer rings 13A and 13B. The radial load P1 is a load corresponding to road surface reaction force acting on the wheels when the vehicle travels straight, and is a load corresponding to the axle load.

By controlling the hydraulic pressure of the hydraulic oil supplied to the hydraulic cylinder 38, the radial load P1 can reproduce the load when the vehicle actually travels. The radial load P1 applied by the hydraulic cylinder 38 is a radial load obtained by correcting the masses of the pair of support mechanisms 20A and 20B and the pair of load rods 33A and 33B, which will be described later.

Load rods 33A and 33B are connected to the support shafts 23A and 23B of the pair of support mechanisms 20A and 20B, respectively, on the side opposite to the co-rotating portion 31 with respect to the support mechanisms 20A and 20B. The pair of load rods 33A, 33B are provided with rollers 36A, 36B, respectively. Supports directional movement. Further, the pair of load rods 33A, 33B are prevented from rotating by rotation stoppers 34A, 34B provided on the base 40, and a stopper 35A arranged axially outside the pair of load rods 33A, 33B. 35B limits the amount of axial movement. The support mechanism for the pair of load rods 33A and 33B described above is shown in schematic diagrams.

The pair of load rods 33A, 33B are axially connected by a pair of hydraulic cylinders 39A, 39B. A pair of hydraulic cylinders 39A and 39B apply axial loads P2 and P3 to a pair of load rods 33A and 33B, respectively. A pair of hydraulic cylinders 39A and 39B create a virtual road surface at an arbitrary position and a road surface reaction force at that position (axial position of the tire radius and the hub unit bearing) by a resultant force with the hydraulic cylinder 38 . Therefore, for example, the road surface reaction force acting on the wheels from the virtual road surface is reproduced when the vehicle is traveling straight, when canvas thrust load is input, and when cornering acceleration is applied.

A measuring rod 41 is fixed to the co-rotating portion 31 . The dynamic torque of the hub unit bearings 11A, 11B is measured by a load cell 42 via a measuring rod 41 as a total value of tangential forces generated in the flanged outer rings 13A, 13B when the hub wheels 12A, 12B rotate.

The measuring rod 41 is provided vertically above or below the center of rotation (the central axis L) of the co-rotating portion 31 (in the illustrated example, above), and is preferably lightened as much as possible.
If the measuring rods 41 need to be provided horizontally, the measuring rods 41 may be provided on both sides of the co-rotating portion 31 in the axial direction for balance.

Further, in this embodiment, the support shafts 23A and 23B of the pair of support mechanisms 20A and 20B, the pair of hub unit bearings 11A and 11B, and the co-rotating portion 31 are arranged concentrically.

The dynamic torque measurement in the fuel consumption measurement mode by the dynamic torque measuring device 10 having such a configuration is performed by driving the drive motor 26 to the pair of rotating housings 22A while the loads P1, P2 and P3 are applied to the hub unit bearings 11A and 11B. , 22B are rotated, the pair of hub wheels 12A and 12B are rotated at a rotation speed specified in the JC08 mode or WLTC mode, and the total tangential force (total dynamic torque) generated on the flanged outer rings 13A and 13B by co-rotation. can be measured by the load cell 42. That is, one dynamic torque measurement can accurately measure the total torque generated by the co-rotation of the pair of hub unit bearings 11A and 11B corresponding to the left and right wheels of the vehicle.

When the hub wheels 12A and 12B rotate, especially in a state where the rotational speed of the hub wheels 12A and 12B changes moment by moment in the fuel consumption measurement mode, etc., the co-rotation force (dynamic force) measured at the flanged outer rings 13A and 13B torque), the moment of inertia of the flanged outer rings 13A and 13B and the co-rotating portion 31 greatly affects the measurement error. That is, by setting the moment of inertia of the flanged outer rings 13A and 13B and the co-rotating portion 31 to be small, the dynamic torque associated with the rotational fluctuations of the hub wheels 12A and 12B can be measured without delay and with high sensitivity.

Therefore, according to the dynamic torque measuring device 10 of the present embodiment, the co-rotation part 31 can be shared by a pair of objects to be measured, and the co-rotation part 31 is made of a light metal and has a simple cylindrical shape. Therefore, it is easy to maintain balance, and the moment of inertia of the co-rotating portion 31 can be reduced. As a result, even when the rotational speed of the hub wheels 12A, 12B changes moment by moment, it is possible to accurately measure dynamic torque due to co-rotation generated in the flanged outer rings 13A, 13B. It is possible to measure the total dynamic torque of a pair of objects whose rotation directions are different from each other.
Furthermore, since the co-rotating portion 31 is not affected by the size of the object to be measured, the inertial moment of the co-rotating portion 31 can be reduced in that the co-rotating portion 31 can be made smaller.

(Modified example of the first embodiment)
Next, a dynamic torque measuring device of a modified example of the first embodiment will be described with reference to FIG.
The configuration of the dynamic torque measuring device 10 of this modification is the same as that of the dynamic torque measuring device 10 of the first embodiment, and differs from the first embodiment only in the mounting directions of the pair of hub unit bearings 11A and 11B.

That is, a pair of hub rings 12A, 12B are connected to a co-rotating portion 31, and a pair of flanged outer rings 13A, 13B are connected to rotation housings 22A, 22B of a pair of support mechanisms 20A, 20B. Then, the pair of flanged outer rings 13A and 13B are rotated, and the load cell 42 measures the total dynamic torque generated by the co-rotation generated in the pair of hub wheels 12A and 12B.

In the dynamic torque measuring device 10 of this modified example, the unbalance amount of the flanged outer rings 13A, 13B is large, and when the pair of flanged outer rings 13A, 13B are assembled to the co-rotating portion 31 as in the first embodiment, the pair of This is effective when the imbalance of the assembly of the flanged outer rings 13A, 13B and the co-rotating portion 31 cannot be adjusted. That is, the pair of rotating housings 22A and 22B are respectively supported by the pair of load rods 33A and 33B via back-to-back angular contact ball bearings 21A and 21B (which may be tapered roller bearings) having high rigidity. Therefore, even if the flanged outer rings 13A, 13B with a large unbalance amount are attached to the rotary housings 22A, 22B, they can be rotated without any problem, and the dynamic torque can be measured.

(Second embodiment)
Next, a dynamic torque measuring device according to a second embodiment of the invention will be described with reference to FIG.
The configuration of the dynamic torque measuring device 10 of this embodiment is the same as that of the dynamic torque measuring device 10 of the first embodiment. 31 is different from the dynamic torque measuring device 10 of the first embodiment.

In the dynamic torque measuring device 10 of the present embodiment, the unbalance amount of the flanged outer rings 13A, 13B is large, and when the pair of flanged outer rings 13A, 13B are assembled to the co-rotating portion 31, the pair of flanged outer rings 13A, 13B This is effective when the imbalance of the assembly of the sprocket and the corotating portion 31 cannot be adjusted.

In general, when the flanged outer rings 13A, 13B are attached to the knuckles 45, 45B, they are slightly deformed and the roundness of the raceway surface is lowered. Deterioration of the roundness of the raceway surface may generate an internal load on the bearing portions of the hub unit bearings 11A and 11B, which may affect the dynamic torque in the same way as when the preload increases.

Therefore, according to the dynamic torque measuring device 10 of the present embodiment, the pair of flanged outer rings 13A and 13B are attached to the co-rotating portion 31 via the knuckles 45A and 45B, respectively, so that the dynamic torque measuring device 10 can be measured in a state closer to the actual vehicle. Dynamic torque can be measured.

(Modification of Second Embodiment)
Next, a dynamic torque measuring device of a modified example of the second embodiment of the present invention will be described with reference to FIG.
The configuration of the dynamic torque measuring device 10 of this modified example is the same as that of the dynamic torque measuring device 10 of the modified example of the first embodiment shown in FIG. It differs from the dynamic torque measuring device 10 of the modified example of the first embodiment in that it is attached to the rotating housings 22A and 22B via 45B.

In the dynamic torque measuring device 10 of this modified example, a pair of rotating housings 22A and 22B are back-to-back angular contact ball bearings 21A and 21B (which may be tapered roller bearings) having high rigidity, and a pair of load rods 33A and 33A. Since it is supported by 33B, it is effective when the unbalance amount of the assembly of the flanged outer rings 13A, 13B and the knuckles 45A, 45B is large.

(Third embodiment)
Next, a dynamic torque measuring device according to a third embodiment of the invention will be described with reference to FIG.
The configuration of the dynamic torque measuring device 10 of this embodiment is the same as that of the dynamic torque measuring device 10 of the first embodiment shown in FIG. , the dynamic torque measuring device 10 differs from the dynamic torque measuring device 10 of the first embodiment in that a constant temperature bath 50 that can keep the temperature constant is provided.

The dynamic torque of the pair of hub unit bearings 11A, 11B is affected by the viscosity of the lubricant in the hub unit bearings 11A, 11B, and the viscosity of the lubricant is highly dependent on temperature. Therefore, when measuring the dynamic torque of the hub unit bearings 11A and 11B, the temperature of the constant temperature bath 50 is controlled at a predetermined temperature to suppress the influence of the temperature on the dynamic torque. This enables more accurate dynamic torque measurement. Furthermore, by providing the constant temperature bath 50, it becomes possible to measure the dynamic torque at an arbitrary temperature such as a low temperature or a high temperature. In order to avoid the influence of the temperature on the load cell 42, the dynamic torque is preferably measured by the load cell 42 arranged outside the constant temperature bath 50. FIG.

In addition, when the static pressure pad 32 is composed of a hydraulic static pressure pad, it is preferable to dispose the hydraulic pad, which releases hydraulic pressure and converts to heat, outside the constant temperature bath 50 to facilitate temperature control of the constant temperature bath 50. . Note that the dynamic torque measuring device having a configuration in which the pair of hub unit bearings 11A and 11B and the co-rotating portion 31 are housed in the constant temperature bath 50 is not limited to the dynamic torque measuring device 10 shown in the first embodiment. The dynamic torque measuring device 10 can be applied to any of the modification of the embodiment (see FIG. 2), the second embodiment (see FIG. 3), and the modification of the second embodiment (see FIG. 4).

It should be noted that the present invention is not limited to the above-described embodiments and modified examples, and can be modified, improved, etc. as appropriate.

As described above, this specification discloses the following matters.
(1) A dynamic torque measuring device for measuring dynamic torque of a pair of objects to be measured each having a stationary member and a rotating member rotatable relative to the stationary member,
A pair of rotary housings each having a rotating housing that holds a first member that is one of the fixed side member and the rotating side member of the pair of objects to be measured, and a support shaft that supports the rotating housing via a rolling bearing. a support mechanism;
a driving mechanism that rotationally drives the pair of first members via the respective rotating housings;
A second member disposed between the pair of support mechanisms, which is the other of the fixed-side member and the rotary-side member of the pair of objects to be measured, is held. a co-rotating portion co-rotating together with the second member of
a static pressure pad that rotatably supports the co-rotating portion and receives a radial load;
A pair of load rods connected to the support shaft on the side opposite to the co-rotating portion with respect to each of the pair of support mechanisms and applying an axial load to the pair of first members via the pair of support mechanisms. and,
with
The total dynamic torque acting on the pair of objects to be measured is given by measuring the tangential force generated in the co-rotating part,
Dynamic torque measuring device.
According to this configuration, since the co-rotating portion can be shared by a pair of objects to be measured, the moment of inertia of the co-rotating portion can be reduced, and the rotational speed of the first member changes every moment. Even if there is, it is possible to accurately measure the dynamic torque due to co-rotation generated in the second member, and to measure the total dynamic torque of a pair of objects to be measured whose rotation directions are different from each other in one measurement.

(2) The fixed-side member is a flanged outer ring of a hub unit bearing, the rotating-side member is a hub ring of the hub unit bearing, and the hub unit bearing has a road surface resistance acting on a vehicle wheel. The dynamic torque measuring device according to (1), wherein a load corresponding to force is applied.
According to this configuration, it is possible to measure the dynamic torque due to co-rotation generated in the flanged outer ring of the hub unit bearing in the fuel efficiency measurement mode.

(3) The dynamic torque measuring device according to (1) or (2), further comprising a constant temperature bath that accommodates the pair of objects to be measured.
According to this configuration, it is possible to suppress the influence of the viscosity of the lubricant on the measured value of the dynamic torque.

(4) A dynamic torque measuring method using the dynamic torque measuring device according to any one of (1) to (3),
With the radial load and the axial load applied to the co-rotating portion and the pair of load rods, the first member is rotationally driven, and the tangential force generated in the co-rotating portion is measured. A dynamic torque measuring method for measuring the total dynamic torque acting on an object to be measured.
According to this configuration, the total dynamic torque acting on the pair of objects to be measured can be measured by rotationally driving the first member with a load applied and measuring the tangential force generated in the co-rotating portion.

(5) the radial load and the axial load applied to the co-rotating portion and the load rod correspond to the road surface reaction force acting on the wheels of the vehicle;
The dynamic torque measuring method according to (4), wherein the total dynamic torque acting on the pair of objects to be measured is measured while changing the rotation speed of the first member.
According to this configuration, the total dynamic torque acting on the pair of objects to be measured can be measured in a state in which the hub unit bearing is loaded with the road surface reaction force acting on the wheels of the vehicle.

10 dynamic torque measuring device 11A, 11B hub unit bearing (object to be measured)
12A, 12B hub wheel (rotation side member)
13A, 13B Outer ring with flange (fixed side member)
20A, 20B Support mechanism 21A, 21B Angular ball bearing (rolling bearing)
22A, 22B Rotation housings 23A, 23B Support shaft 25 Drive mechanism 31 Co-rotation part 32 Static pressure pads 33A, 33B Load rods 45A, 45B Knuckle 50 Constant temperature bath P1 Radial load P2 Thrust load (axial load)

Claims (5)

A dynamic torque measuring device for measuring dynamic torque of a pair of objects to be measured each having a stationary member and a rotating member rotatable relative to the stationary member,
A pair of rotary housings each having a rotating housing that holds a first member that is one of the fixed side member and the rotating side member of the pair of objects to be measured, and a support shaft that supports the rotating housing via a rolling bearing. a support mechanism;
a driving mechanism that rotationally drives the pair of first members via the respective rotating housings;
A second member disposed between the pair of support mechanisms, which is the other of the fixed-side member and the rotary-side member of the pair of objects to be measured, is held. a co-rotating portion co-rotating together with the second member of
a static pressure pad that rotatably supports the co-rotating portion and receives a radial load;
A pair of load rods connected to the support shaft on the side opposite to the co-rotating portion with respect to each of the pair of support mechanisms and applying an axial load to the pair of first members via the pair of support mechanisms. and,
with
The total dynamic torque acting on the pair of objects to be measured is given by measuring the tangential force generated in the co-rotating part,
Dynamic torque measuring device. The fixed side member is a flanged outer ring of a hub unit bearing, the rotating side member is a hub ring of the hub unit bearing, and the hub unit bearing is subjected to a road surface reaction force acting on a wheel of a vehicle. 2. The dynamic torque measuring device according to claim 1, wherein the load is applied. 3. The dynamic torque measuring device according to claim 1, further comprising a constant temperature bath containing said pair of objects to be measured. A dynamic torque measuring method using the dynamic torque measuring device according to any one of claims 1 to 3,
With the radial load and the axial load applied to the co-rotating portion and the pair of load rods, the first member is rotationally driven, and the tangential force generated in the co-rotating portion is measured. A dynamic torque measuring method for measuring the total dynamic torque acting on an object to be measured. The radial load and the axial load applied to the co-rotating portion and the load rod correspond to the road surface reaction force acting on the wheels of the vehicle,
5. The dynamic torque measuring method according to claim 4, wherein the total dynamic torque acting on the pair of objects to be measured is measured while changing the rotation speed of the first member.

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