JP2023122910A - 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, when a rotating side member is driven to rotate in a measurement object having a rotating side member and a fixed side member, it is possible to measure dynamic torque occurring to the fixed side member with good accuracy.SOLUTION: A dynamic torque measuring device 10 comprises a first support mechanism 20 that is provided with a first drive mechanism 26, a second support mechanism 30 that supports a fixed side member 13 so as to be co-rotatable; and a load cell 72 for measuring the dynamic torque occurring to the fixed side member 13. The second support mechanism 30 includes a shank 54 which is disposed coaxially with a rotating side member 12, an intermediate housing 57 that is supported to the shank 54 so as to be relatively rotatable via a first roller bearing 56, an outside housing 59 that is supported to the intermediate housing 57 so as to be relatively rotatable via a second roller bearing 58, and a second drive mechanism 63 that rotationally drives the intermediate housing 57. One of the shank 54 and the outside housing 59 constitutes a co-rotation part.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamic torque measuring device and a dynamic torque measuring method. The present invention relates to a dynamic torque measuring device and a dynamic torque measuring method capable of measuring dynamic torque due to co-rotation generated in a stationary member.

Conventionally, rolling bearings, bearing sealing members, hub unit bearings, etc. are known as objects to be measured for measuring the dynamic torque due to co-rotation generated in the stationary member. In recent years, there has been a growing demand for energy saving in vehicles, etc. In the case of an object to be measured that has a rotating side member and a fixed side member, when the rotating side member rotates, a small amount of torque loss due to co-rotation of the fixed side member is also a problem. is becoming The dynamic torque due to this co-rotation is the torque consumed by the frictional resistance of the object to be measured, and the lower the value of this dynamic torque, the more it contributes to fuel efficiency. Therefore, more accurate dynamic torque measurement of the object to be measured is required.

In Patent Document 1, one of the objects to be measured (for example, a seal member) whose dynamic torque is to be measured is supported by a rolling bearing, the other of the objects to be measured is rotationally driven, and one of the objects to be measured rotates together. A dynamic torque sensing device is disclosed that measures torque as a tangential force.

JP 2014-224546 A

In the torque detection device described in Patent Document 1, the load on the rolling bearing is about the weight of the jig itself, and the torque of the object to be measured is much larger than the starting torque of the rolling bearing that supports one of the objects to be measured. If the error caused by this is negligible, it can be made cheaper and smaller than a torque detector using a hydrostatic bearing or the like, so it is effective for dynamic torque measurement of bearing seal members, brake discs, and the like.

However, if the starting torque of the rolling bearing is too large to be ignored, a measurement error may occur within the range of the starting torque of the rolling bearing that supports one of the objects to be measured. For example, FIG. 3 shows the measurement of the dynamic torque of the hub unit bearing 1 having the hub ring 2 and the flanged outer ring 3 while the loads P1 and P2 are applied via the load rods 103 to the hub unit bearing 1. A dynamic torque measuring device 100 is shown. The dynamic torque measuring device 100 includes, in order from the left side of FIG. A measuring arm 108, which mainly comprises 106 and extends along a co-rotating shaft 105, is connected to a load cell 107 for torque measurement. In this case, since the load supported by the hub unit bearing 1 is directly applied to the rolling bearing 106 supporting the co-rotating shaft 105, the starting torque of the rolling bearing 106 increases, resulting in a large measurement error. Using a hydrostatic bearing makes it easier to measure with a load. It causes an error.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and its object is to provide a device for measuring motion generated in a stationary member when the rotating member is rotationally driven in an object to be measured having a rotating member and a stationary member. An object of the present invention is to provide a dynamic torque measuring device and a dynamic torque measuring method capable of accurately measuring torque.

The above objects of the present invention are achieved by the following configurations.
[1] In an object to be measured having a stationary member and a rotating member that can rotate relative to the stationary member, rotate the rotating member and measure the dynamic torque generated in the stationary member. A dynamic torque measuring device that
a first support mechanism including a first drive mechanism for rotationally driving the rotation-side member and supporting the rotation-side member;
a second support mechanism arranged coaxially with the rotation axis of the rotation-side member and supporting the fixed-side member so as to rotate together with the rotation of the rotation-side member;
a load cell for measuring the dynamic torque generated in the stationary member;
with
The second support mechanism includes a shaft portion arranged coaxially with the rotating shaft of the rotation-side member, and a shaft portion provided around the shaft portion to support the shaft portion via a first rolling bearing. an intermediate housing supported so as to be relatively rotatable; an outer housing provided around the intermediate housing and supported so as to be relatively rotatable with respect to the intermediate housing via a second rolling bearing; and rotating the intermediate housing. a second drive mechanism that drives,
The dynamic torque measuring device, wherein one of the shaft portion and the outer housing constitutes a co-rotating portion that holds the fixed-side member and rotates together with the fixed-side member.

[2] A dynamic torque measuring method using the dynamic torque measuring device according to [1],
The dynamic torque is measured by rotating the rotating side member while rotating the intermediate housing, and measuring the tangential force generated in the co-rotating portion with a load cell.

According to the dynamic torque measuring device and the dynamic torque measuring method of the present invention, in an object to be measured having a rotating member and a stationary member, when the rotating member is rotationally driven, the dynamic torque generated in the stationary member can be accurately measured. can be measured.

1 is a configuration diagram of a dynamic torque measuring device according to a first embodiment of the present invention; FIG. It is a block diagram of a dynamic torque measuring device according to a second embodiment of the present invention. 1 is a configuration diagram of a conventional dynamic torque measuring device; FIG.

A dynamic torque measuring device according to each embodiment of the present invention will be described in detail below with reference to the drawings.
(First embodiment)
As shown in FIG. 1, in the dynamic torque measuring device 10 of this embodiment, a hub unit bearing 11 is used as an object to be measured. That is, the rotating side member of the object to be measured is the hub ring 12 of the hub unit bearing 11 , and the fixed side member of the object to be measured is the flanged outer ring 13 of the hub unit bearing 11 . Then, the dynamic torque measuring device 10 measures the dynamic torque due to co-rotation generated in the flanged outer ring 13 when the hub wheel 12 is rotated.

In a hub unit bearing 11 having a hub wheel 12 and a flanged outer ring 13, a dynamic torque measuring device 10 includes a first support mechanism 20 that supports the hub wheel 12 and a second support mechanism 20 that supports the flanged outer ring 13 so as to rotate together. and a support mechanism 30 of.

The first support mechanism 20 is fitted to a bearing portion 51a of a load portion 51, which will be described later, and includes a rotating shaft 23 rotatably supported by a plurality of back-to-back angular ball bearings 21. As shown in FIG. One end 23 a of the rotating shaft 23 is connected to the rotating flange 12 a of the hub wheel 12 via a mounting jig 24 . The other end 23 b of the rotating shaft 23 is connected to the intermediate shaft 53 and the rotating shaft 26 a of the drive motor 26 via a pair of constant velocity universal joints 25 .

The load portion 51 is formed by a bearing portion 51 a and a substantially L-shaped load rod 51 b that extends radially from a portion of the bearing portion 51 a in the circumferential direction and applies a load to the hub unit bearing 11 . A radial load P1 and a thrust load P2, which correspond to the road surface reaction force acting on the wheels when the vehicle is running, are applied to the load rod 51b by hydraulic cylinders 38 and 39, respectively, at a position corresponding to the center of the tire in the width direction, and at a position corresponding to the center of the tire. It is loaded at a position corresponding to the radius.

The radial load P1 when the vehicle is running straight is half the axle load, and the thrust load P2 is a load corresponding to the canvas thrust load acting on the wheels when the vehicle is running. Therefore, by controlling the hydraulic pressure of the hydraulic oil supplied to the hydraulic cylinders 38 and 39, it is possible to reproduce the load when the vehicle actually travels.
Also, by controlling the hydraulic pressure of the hydraulic oil supplied to the hydraulic cylinders 38 and 39, the radial load P1 and the thrust load P2 when the vehicle is turning can be reproduced.

The second support mechanism 30 includes a shaft portion 54 fixed to the outer ring flange 13 a of the flanged outer ring 13 via a mounting jig 55 , and a pair of second support mechanisms provided around the shaft portion 54 . and an intermediate housing 57 which is supported relatively rotatably via one rolling bearing 56, and which is provided around the intermediate housing 57 and supports the intermediate housing 57 relatively rotatably via a pair of second rolling bearings 58. and an outer housing 59 . In the dynamic torque measuring device 10 of the present embodiment, the shaft portion 54 and the mounting jig 55 constitute a co-rotating portion co-rotating together with the flanged outer ring 13 .

In the present embodiment, since the first rolling bearing 56 is subjected to a moment load, the angular contact ball bearing is used in a DB combination up to a correct clearance aiming for zero preload, thereby suppressing rotational torque and heat generation. , giving rigidity. In addition, by providing the second rolling bearing 58 on a substantially extended line of the contact angle of the first rolling bearing 56, the rigidity is further improved.

The outer housing 59 is fixed to the base 60 of the dynamic torque measuring device 10 and does not rotate. In addition, the intermediate housing 57 has a belt 65 wound between a pulley 61 fixed to the intermediate housing 57 and a pulley 62 fixed to a rotating shaft 64 of a gear motor 63, for example, which is a second driving mechanism. is rotated at a constant low speed by A gear motor 63 is mounted on an outer housing 59 fixed to the base 60 .

In this embodiment, the rotating shaft 23, the mounting jig 55, the shaft portion 54, the first rolling bearing 56, the intermediate housing 57, and the second rolling bearing 58 are concentrically arranged on the central axis L of the hub unit bearing 11. are placed.

A measuring rod 71 is fixed to the mounting jig 55 . As for the dynamic torque of the hub unit bearing 11 , the tangential force generated in the flanged outer ring 13 when the hub wheel 12 rotates is measured by the load cell 72 via the measuring rod 71 .

The measuring rod 71 is provided vertically above or below the center of rotation (center axis L) of the co-rotating portion (above in the illustrated example), and is preferably lightened as much as possible.
If the measuring rods 71 need to be provided horizontally, the measuring rods 71 may be provided on both sides of the mounting jig 55 in the axial direction for balance.

Furthermore, the dynamic torque measuring device 10 is provided with a constant temperature bath 73 capable of constant temperature control so as to accommodate the hub unit bearing 11 and the load portion 51 . The dynamic torque of the hub unit bearing 11 is affected by the viscosity of the lubricant in the hub unit bearing 11, and the viscosity of the lubricant is highly dependent on temperature. Therefore, when the dynamic torque of the hub unit bearing 11 is measured, the temperature of the constant temperature bath 73 is controlled at a predetermined temperature to suppress the influence of the environmental temperature on the dynamic torque. This enables more accurate dynamic torque measurement. Further, by providing the constant temperature bath 73, it is possible to measure the dynamic torque at any environmental temperature such as low temperature or high temperature.

Next, a method for measuring the dynamic torque of the hub unit bearing 11 using the dynamic torque measuring device 10 having such a configuration will be described.

Since the load supported by the hub unit bearing 11 is directly applied to the first rolling bearing 56, when the shaft portion 54 rotates due to co-rotation from the state where the rotation of the intermediate housing 57 is stopped, the first rolling bearing The starting torque of 56 acts to affect the measured dynamic torque of the hub unit bearing 11 .

That is, when the dynamic torque of the hub unit bearing 11 is measured by the load cell 72 while the intermediate housing 57, in other words, the first rolling bearing 56 is stopped, the measured value shows the torque of the first rolling bearing 56. Since the starting torque is added, there is a possibility that the dynamic torque of the hub unit bearing 11 cannot be accurately measured due to the influence of the starting torque of the first rolling bearing 56 .

Therefore, by rotating the intermediate housing 57 with the gear motor 63 at a constant low speed at which an increase in torque due to the influence of the rotation speed of the intermediate housing 57 can be ignored, the first rolling bearing 56 can generate torque more than the starting torque. The dynamic torque of the hub unit bearing 11 is measured by generating a significantly small rotational torque. Specifically, since the starting torque is spin friction based on a static friction coefficient of μ=0.15, for example, it is larger than a rotational torque based on a dynamic friction coefficient of μ=0.001 to 0.002, for example.

If the dynamic torque of the hub unit bearing 11 is measured by the load cell 72 in a state in which a small rotational torque is generated in the first rolling bearing 56, that is, in a state in which the intermediate housing 57 is rotating, Since the rotational torque of the rolling bearing 56 of No. 1 is negligibly small compared to the dynamic torque of the hub unit bearing 11, the measured value can be used as the dynamic torque of the hub unit bearing 11 without any problem.

However, if the rotational torque of the first rolling bearing 56 is not negligible compared to the dynamic torque of the hub unit bearing 11, the measured value measured by the load cell 72 will be By correcting the rotation torque of 56, the dynamic torque of hub unit bearing 11 can be known with high accuracy.

A specific method for correcting the rotational torque of the first rolling bearing 56 with respect to the measured value is to stop the driving motor 26 that rotationally drives the hub wheel 12 and rotate the intermediate housing 57 at a constant low speed by means of the gear motor 63. can be easily corrected by adjusting (shifting) the zero point of the load cell 72 . Further, in this state, since the rotational torque of the first rolling bearing 56 is stable, accurate correction is possible.

By rotating the intermediate housing 57 at a constant low speed with the gear motor 63 in this way, rotational torque is generated in the first rolling bearing 56 , and the dynamic torque of the hub unit bearing 11 is measured by the load cell 72 . Further, by correcting the rotational torque of the first rolling bearing 56 with respect to the value measured by the load cell 72 as necessary, the dynamic torque of the hub unit bearing 11 can be measured with high accuracy. That is, the dynamic torque of the hub unit bearing 11 can be accurately measured even when a load is applied to the hub unit bearing 11 .

Further, the temperature of the hub unit bearing 11 and the load portion 51 is kept constant by the constant temperature bath 73, the lubricating oil supplied to the first rolling bearing 56 is recovered by the recovery portion 66, and the temperature is controlled by an oil chiller or the like. By circulating the fluid in a constant temperature, the influence of the temperature on the dynamic torque can be suppressed, and more accurate dynamic torque measurement becomes possible.

As a result, the dynamic torque of the hub unit bearing 11 can be accurately measured by a small and inexpensive dynamic torque measuring device compared to a dynamic torque measuring device using a hydrostatic bearing with a low load capacity.

(Second embodiment)
Next, a dynamic torque measuring device according to a second embodiment of the invention will be described with reference to FIG.
The dynamic torque measuring device 10A of the present embodiment measures the dynamic torque due to the co-rotation of a bearing sealing member 74 for sealing between the inner and outer rings of the bearing as an object to be measured. The bearing seal member 74 includes a slinger 75 having a substantially L-shaped annular cross section and a seal ring 77 having a seal lip 76 that slides on the slinger 75, and is assembled so as to face each other in the axial direction.

That is, the rotary side member of the object to be measured is the slinger 75 that rotates integrally with a rotary shaft 78 of the bearing seal member 74 , and the fixed side member of the object to be measured is the seal of the bearing seal member 74 . ring 77; Then, the dynamic torque measuring device 10A of the present embodiment measures the dynamic torque due to co-rotation generated in the seal ring 77 when the slinger 75 is rotated.

The dynamic torque measuring device 10A includes a first support mechanism 80 that rotatably supports the slinger 75, and a second support mechanism 85 that supports the seal ring 77 so as to rotate together.

The first support mechanism 80 includes a rotating shaft 78 rotatably disposed inside the intermediate housing 87 , a cap member 81 for rotating the rotating shaft 78 , and a space between the rotating shaft 78 and the cap member 81 . , and includes a spacer 82 and an inner annular jig 83 for adjusting the axial positions of the slinger 75 and the seal ring 77 (the axial interference of the seal lip 76).

One end of the rotary shaft 78 is provided with a small diameter portion 78a. An inner annular jig 83 is externally fitted and fixed to the small-diameter portion 78 a via a spacer 82 for adjusting the interference of the bearing seal member 74 . A slinger 75 of a bearing seal member 74 is fitted and fixed to the inner annular jig 83 .

Further, a cap member 81 is circumferentially fixed to the small diameter portion 78a by a set screw 84 so as to be axially movable. The cap member 81 is rotationally driven by a first driving device (not shown). The inner annular jig 83 is axially sandwiched between the cap member 81 and the spacer 82 . The first support mechanism 80 configured as described above is used to measure the dynamic torque when no thrust load is applied to the bearing seal member 74 .

In addition, the thrust load Fa in the figure deforms the seal lip 76 to maintain the interference adjusted by the spacer 82, and is also applied between the cap member 81 and the cap receiving portion 97 and between the rotating shaft 78 and the rotating shaft 78. It is provided in order to prevent the axial contact surface from slipping, such as between the seats 98 . Also, in the first support mechanism 80 , the cap receiving portion 97 may be configured to rotatably support the cap member 81 , and a driving device may be provided on the rotating seat 98 side of the rotating shaft 78 .

The second support mechanism 85 includes an intermediate housing 87 provided around the rotating shaft 78 and supported rotatably relative to the rotating shaft 78 via a pair of first rolling bearings 86, and the intermediate housing 87. and an outer housing 89 that is provided around and supported through a pair of second rolling bearings 88 so as to be relatively rotatable. An outer annular jig 90 having a seal ring 77 attached to its inner diameter is fixed to the upper surface of the outer housing 89 .

The outer annular jig 90 and the inner annular jig 83 face each other in the radial direction. . Specifically, the slinger 75 is attached to the inner annular jig 83, the seal ring 77 is attached to the outer annular jig 90, and the axial interference of the seal lip 76 is increased by changing the thickness of the spacer 82. adjusted.

In the dynamic torque measuring device 10A of the present embodiment, the outer housing 89 and the outer annular jig 90 form a co-rotating portion co-rotating together with the seal ring 77 .

The intermediate housing 87 is driven by a belt 94 wound between a pulley 91 fixed to the intermediate housing 87 and a pulley 93 fixed to a rotating shaft 92a of a motor 92, which is a second drive mechanism. rotationally driven at high speed. The motor 92 is fixed on the base 60 of the dynamic torque measuring device 10A.

In this embodiment, since the seal 74 is not the object to be measured that supports the load, the load applied to the first rolling bearing 86 and the second rolling bearing 88 is small (self weight and lip reaction force). , the first rolling bearing 86 and the second rolling bearing 88 do not need to be a DB combination of angular ball bearings, and deep groove ball bearings are used with positive clearance.

In this embodiment, the rotating shaft 78, the inner annular jig 83, the outer annular jig 90, the first rolling bearing 86, the intermediate housing 87, the second rolling bearing 88, and the outer housing 89 form the bearing seal member 74. They are arranged concentrically on the central axis L.

A measuring rod 95 is secured to the outer housing 89 . The dynamic torque of the bearing seal member 74 is obtained by measuring the tangential force generated in the seal ring 77 when the slinger 75 rotates with the load cell 96 via the measuring rod 95 .

The dynamic torque measurement by the dynamic torque measuring device 10A having such a configuration is performed with the bearing seal member 74 attached between the inner annular jig 83 and the outer annular jig 90, and the dynamic torque of the first embodiment is measured. As with the measuring device 10 , the motor 92 rotates at a constant low speed such that an increase in torque due to the rotational speed of the intermediate housing 87 can be ignored.

As a result, the tangential force generated in the seal ring 77 is measured by the load cell 96 via the measuring rod 95 in a state in which the second rolling bearing 88 generates a rotational torque that is much smaller than the starting torque.

If the rotational torque of the second rolling bearing 88 is negligibly small compared to the dynamic torque of the bearing seal member 74 , then the measured value measured by the load cell 96 is the dynamic torque of the bearing seal member 74 . and

Further, when the rotational torque of the second rolling bearing 88 is not negligible compared to the dynamic torque of the bearing seal member 74, the measured value measured by the load cell 96 is The rotational torque of the bearing 88 is corrected. Thereby, the dynamic torque of the bearing sealing member 74 can be measured with high accuracy. Note that the method of correcting the rotational torque of the second rolling bearing 88 is the same as that of the dynamic torque measuring device 10 of the first embodiment, so detailed description will be omitted.

As described above, the dynamic torque of the bearing sealing member 74 can be accurately measured by a small and inexpensive dynamic torque measuring device compared to a dynamic torque measuring device using a hydrostatic bearing with a low load capacity.

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

As described above, this specification discloses the following matters.
(1) In an object to be measured having a stationary member and a rotating member that can rotate relative to the stationary member, rotate the rotating member and measure the dynamic torque generated in the stationary member. A dynamic torque measuring device that
a first support mechanism including a first drive mechanism for rotationally driving the rotation-side member and supporting the rotation-side member;
a second support mechanism arranged coaxially with the rotation axis of the rotation-side member and supporting the fixed-side member so as to rotate together with the rotation of the rotation-side member;
a load cell for measuring the dynamic torque generated in the stationary member;
with
The second support mechanism includes a shaft portion arranged coaxially with the rotating shaft of the rotation-side member, and a shaft portion provided around the shaft portion to support the shaft portion via a first rolling bearing. an intermediate housing supported so as to be relatively rotatable; an outer housing provided around the intermediate housing and supported so as to be relatively rotatable with respect to the intermediate housing via a second rolling bearing; and rotating the intermediate housing. a second drive mechanism that drives,
The dynamic torque measuring device, wherein one of the shaft portion and the outer housing constitutes a co-rotating portion that holds the fixed-side member and rotates together with the fixed-side member.
According to this configuration, in an object to be measured having a rotating member and a stationary member, when the rotating member is rotationally driven, dynamic torque due to co-rotation generated in the stationary member can be accurately measured. Moreover, the dynamic torque measuring device can be made smaller than a dynamic torque measuring device using a hydrostatic bearing.

(2) The dynamic torque measuring device according to (1), wherein the dynamic torque is given by correcting the rotational torque of the rolling bearing with respect to the tangential force generated in the co-rotating portion detected by the load cell. .
According to this configuration, even if the dynamic torque of the rolling bearing that rotatably supports the co-rotating portion cannot be ignored compared to the dynamic torque of the object to be measured, the rolling bearing is not affected by the measured value detected by the load cell. By correcting the dynamic torque of , the dynamic torque due to co-rotation generated in the stationary member can be known with high accuracy.

(3) the object to be measured is a hub unit bearing;
The dynamic torque measuring device according to (1) or (2), wherein the hub unit bearing is loaded with a load corresponding to road surface reaction force acting on a wheel of the vehicle.
According to this configuration, it is possible to measure the dynamic torque due to the co-rotation generated in the flanged outer ring of the hub unit bearing while the hub unit bearing is loaded with the reaction force of the road surface acting on the wheel of the vehicle.

(4) A dynamic torque measuring method using the dynamic torque measuring device according to any one of (1) to (3),
The dynamic torque is measured by rotating the rotating side member while rotating the intermediate housing, and measuring the tangential force generated in the co-rotating portion with a load cell.
According to this configuration, even when a load is applied to the object to be measured, the dynamic torque generated in the co-rotating portion due to the rotation of the rotation-side member can be accurately measured.

10, 10A dynamic torque measuring device 11 hub unit bearing (object to be measured)
12 hub ring (rotation side member)
13 Outer ring with flange (fixed side member)
20, 80 first support mechanisms 23, 78 rotating shaft 26 drive motor (first drive mechanism)
30, 85 second support mechanism 51b load rod 54 shaft portion (co-rotation portion)
56, 86 first rolling bearings 57, 87 intermediate housings 58, 88 second rolling bearings 59 outer housing 63 gear motor (second drive mechanism)
72, 96 load cell 74 bearing sealing member (object to be measured)
75 Slinger (Rotating side member)
77 seal ring (stationary member)
89 Outer housing (co-rotating part)
92 motor (second drive mechanism)
P1 Radial load P2 Thrust load (canvas thrust load)

Claims (4)

In an object to be measured having a stationary member and a rotating member rotatable relative to the stationary member, the rotating member is rotationally driven and the dynamic torque generated in the stationary member is measured. A measuring device,
a first support mechanism including a first drive mechanism for rotationally driving the rotation-side member and supporting the rotation-side member;
a second support mechanism arranged coaxially with the rotation axis of the rotation-side member and supporting the fixed-side member so as to rotate together with the rotation of the rotation-side member;
a load cell for measuring the dynamic torque generated in the stationary member;
with
The second support mechanism includes a shaft portion arranged coaxially with the rotating shaft of the rotation-side member, and a shaft portion provided around the shaft portion to support the shaft portion via a first rolling bearing. an intermediate housing supported so as to be relatively rotatable; an outer housing provided around the intermediate housing and supported so as to be relatively rotatable with respect to the intermediate housing via a second rolling bearing; and rotating the intermediate housing. a second drive mechanism that drives,
The dynamic torque measuring device, wherein one of the shaft portion and the outer housing constitutes a co-rotating portion that holds the fixed-side member and rotates together with the fixed-side member. 2. The dynamic torque measuring device according to claim 1, wherein the dynamic torque is given by correcting the rotational torque of the rolling bearing with respect to the tangential force generated in the co-rotating portion detected by the load cell. the object to be measured is a hub unit bearing;
3. The dynamic torque measuring device according to claim 1, wherein the hub unit bearing is loaded with a load corresponding to road surface reaction force acting on a wheel of the vehicle. A dynamic torque measuring method using the dynamic torque measuring device according to any one of claims 1 to 3,
The dynamic torque is measured by rotating the rotating side member while rotating the intermediate housing, and measuring the tangential force generated in the co-rotating portion with a load cell.

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