JP2022154794A - Dynamic torque measuring device and dynamic torque measurement method - Google Patents

Abstract

To provide a dynamic torque measuring device and a dynamic torque measurement method capable of precisely measuring dynamic torque by simultaneous rotation occurring in a fixed-side member even in a state in which a rotational speed of a rotation-side member changes every moment in a state in which an external load is applied to a measured object.SOLUTION: A dynamic torque measuring device 10 includes: a first support mechanism 20 for rotatably supporting a rotation-side member 12; and a second support mechanism 30 for supporting a fixed-side member 13 so as to be capable of simultaneously rotating it when the rotation-side member 12 is rotated. The second support mechanism 30 has: a simultaneous rotation part 31 that holds the fixed-side member 13 and is simultaneously rotated along with the fixed-side member 13; and a load part 33 for supporting the simultaneous rotation part 31 by a static pressure bearing 32 so as to be capable of relatively rotating it and for applying a load. Dynamic torque is given by measuring tangential force generated in the fixed-side member 13 or the simultaneous rotation part 31.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a dynamic torque measuring device and a dynamic torque measuring method, and more particularly 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 when a rotating member rotates. .

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. Therefore, dynamic torque measurement in these fuel consumption measurement modes is also required for hub unit bearings as objects to be measured.

In the dynamic torque measurement of the hub unit bearing in these fuel consumption measurement modes, it is necessary to input a linear load (half the axle load + canvas thrust) to the object to be measured, and also to change the rotation speed (vehicle speed) of the rotating side member every moment. There is 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 a torque added to the originally required torque, and the lower the value of this dynamic torque, the more it contributes to fuel efficiency.

In Patent Documents 1 and 2, a bearing (a static pressure bearing or a rolling bearing loaded with a load equivalent to its own weight) having a sufficiently low frictional resistance against the friction torque to be measured is used on one side of the object to be measured (fixed side). A dynamic torque detection device is disclosed which supports one member), rotates the other (rotating member) of the object 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 fixed side member and the co-rotating part that rotates together is not a problem in the case of dynamic torque measurement at a constant rotation speed as long as it passes the transitional period, but in the case of dynamic torque measurement in the fuel consumption measurement mode, the rotating side member Since the rotational speed of the motor changes from moment to moment, that is, the transient period continues all the time, it 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.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems described above, and an object of the present invention is to fix a rotating member even in a state in which an external load is applied to an object to be measured and the rotational speed of a rotating member changes moment by moment. It is an object of the present invention to provide a dynamic torque measuring device and a dynamic torque measuring method capable of accurately measuring dynamic torque due to co-rotation generated in a side member.

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, the rotating member is rotationally driven to measure the dynamic torque generated in the stationary member. A dynamic torque measuring device,
a first support mechanism including a drive mechanism for rotationally driving the rotation-side member and supporting the rotation-side member;
a second support mechanism provided on the side opposite to the first support mechanism with respect to the object to be measured, and supporting the stationary member so as to rotate together with rotation of the rotary member;
with
The second support mechanism includes: a co-rotating portion that holds the fixed-side member and rotates together with the fixed-side member; and
A dynamic torque measuring device, wherein the dynamic torque is given by measuring a tangential force generated in the stationary member or the co-rotating portion.

[2] A dynamic torque measuring method using the dynamic torque measuring device according to [1],
The dynamic torque generated in the stationary member is obtained by rotating the rotating member while the load is applied to the load portion and measuring the tangential force generated in the stationary member or the co-rotating portion. dynamic torque measurement method.

According to the dynamic torque measuring device and the dynamic torque measuring method of the present invention, an external load is applied to the object to be measured, which has a stationary member and a rotating member that can rotate relative to the stationary member. Even in a state where the rotation speed of the rotating side member changes every moment, the dynamic torque due to co-rotation generated in the stationary side member can be measured with high accuracy.

1 is a schematic diagram showing the configuration of a dynamic torque measuring device according to one embodiment of the present invention; FIG. It is a schematic diagram which shows the modification of a drive mechanism. FIG. 2 is a schematic diagram showing the configuration of a dynamic torque measuring device as a comparative example for comparison with the dynamic torque measuring device of FIG. 1;

A dynamic torque measuring device according to an embodiment of the present invention will be described in detail below with reference to the drawings.
As shown in FIG. 1, in this embodiment, a hub unit bearing 11 is used as the object to be measured. That is, the rotating side member of the object to be measured is the hub wheel 12 of the hub unit bearing 11 to which the wheel of the vehicle is attached, and the fixed side member of the object to be measured is the hub unit bearing 11 attached to the suspension system of the vehicle. is the flanged outer ring 13 of . Then, the dynamic torque measuring device 10 of the present embodiment 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 includes a rotary shaft 23 rotatably supported by a support spindle 22 having a plurality of back-to-back angular ball bearings 21 . One end 23a of the rotating shaft 23 on the side of the hub unit bearing 11 is connected to the rotating flange 12a of the hub wheel 12 via mounting jigs 24a and 24b, and the other end 23b of the rotating shaft 23 is driven via a coupling 25. It is connected to a rotary shaft 26a of a drive motor 26, which is a mechanism. As the drive motor 26 rotates, the rotating shaft 23 and the hub wheel 12 are driven to rotate. The mounting jig 24a has a separately replaceable shaft end in order to protect the rotating shaft 23, and the mounting jig 24b is used to attach a plurality of hub wheels 12 of different sizes and types to the testing machine. A coupler for mounting.

Note that the fuel consumption measurement mode simulates a normal, gentle driving pattern, and there is no intense acceleration or deceleration like during a race. 2, pulleys 27a and 27b fixed to the other end 23b of the rotating shaft 23 and the rotating shaft 26a of the drive motor 26, respectively, and a belt 28 wound around the pulleys 27a and 27b. It may be a transmission.

The second support mechanism 30 includes a co-rotating portion 31 fixed to the outer ring flange 13 a of the flanged outer ring 13 , and a load portion 33 rotatably supporting the co-rotating portion 31 with a hydrostatic bearing 32 . The co-rotating portion 31 has a mounting jig 34 fixed to the outer ring flange 13 a and an aluminum annular disk 35 fixed to the mounting jig 34 . By making the disk 35 made of aluminum, the moment of inertia of the co-rotating portion 31 is reduced. The mounting jig 34 and the disk 35 may be formed integrally, but by making the mounting jig 34 replaceable, it becomes easier to deal with a plurality of flanged outer rings 13 of different sizes and types. The load portion 33 extends radially in a circumferential portion of the annular bearing portion 36 forming the static pressure bearing 32 between itself and the disk 35 , and applies a load to the hub unit bearing 11 . and a substantially L-shaped load rod 37 are integrally formed.

A disk 35 made of aluminum that constitutes the co-rotating portion 31 is rotatably supported by the load portion 33 in a non-contact and rotational resistance-free state by a hydrostatic bearing 32 provided in the load portion 33 . In addition, in this embodiment, a hydraulic bearing is used as the static pressure bearing 32 .
In this specification, the state in which there is no rotational resistance does not necessarily mean that the rotational resistance is zero. Rotational resistance is sufficiently small (for example, 1/100 or less), and it means a resistance that is low enough not to affect the dynamic torque measurement of the hub unit bearing 11 .

Further, in this embodiment, the rotating shaft 23, the rotating shaft 26a of the drive motor 26, the mounting jigs 24a, 24b, 34, the disk 35, and the hydrostatic bearing 32 are connected to the hub unit bearing 11 (the hub wheel 12 and the flange). It is arranged concentrically on the central axis L of the attached outer ring 13).

A radial load P1 is applied to the flanged outer ring 13 and the co-rotating portion 31 at a position corresponding to the widthwise center of the tire, and a position corresponding to the radius of the tire. Then, a thrust load P2 is applied from the side surface of the load rod 37. As shown in FIG. The radial load P1 and the thrust load P2 are loads corresponding to straight loads acting on the wheels when the vehicle is running. The radial load P1 is half the axle load, and the thrust load P2 is the loads acting on the wheels when the vehicle is running. It is a load equivalent to the canvas last load.

A specific load mechanism for the radial load P1 and canvas last load P2 is composed of hydraulic cylinders 38 and 39. load is reproducible.
Also, the load portion 33 supports the flanged outer ring 13 and the co-rotating portion 31 with respect to a base or the like via hydraulic cylinders 38 and 39 .

Furthermore, a constant temperature bath 50 capable of constant temperature control is provided so as to accommodate the hub unit bearing 11 , the co-rotating portion 31 and the load rod 37 . 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 measuring the dynamic torque of the hub unit bearing 11, 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 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.

A measuring rod 41 is fixed to the co-rotating portion 31 (the mounting jig 34 in the embodiment shown in FIG. 1) so as to be rotatable together with the co-rotating portion 31 . The dynamic torque of the hub unit bearing 11 is measured by applying the tangential force generated on the flanged outer ring 13 when the hub wheel 12 rotates, via the measuring rod 41, to avoid the influence of temperature. Measured by the load cell 42 .
The measuring rod 41 is preferably provided vertically above or below the center of rotation (the central axis L) of the co-rotating portion 31 (above in the illustrated example), and is preferably lightened as much as possible.

The dynamic torque measurement in the fuel consumption measurement mode is performed by rotating the hub wheel 12 by the drive motor 26 at the rotational speed specified in the JC08 mode or WLTC mode, and measuring the tangential force generated on the flanged outer ring 13 by co-rotation with the load cell 42. It becomes possible by doing.

When the hub wheel 12 rotates, especially in a state where the rotational speed of the hub wheel 12 changes moment by moment in the fuel consumption measurement mode, etc., the co-rotating force (dynamic torque) measured at the flanged outer ring 13 is The moment of inertia of the outer ring 13 and the co-rotating portion 31 has a great influence. That is, by setting the moment of inertia of the flanged outer ring 13 and the co-rotating portion 31 to be small, the dynamic torque associated with the rotational fluctuation of the hub wheel 12 can be measured without delay and with high sensitivity. Therefore, it is desirable that the moment of inertia of the flanged outer ring 13 and the co-rotating portion 31 be as small as possible.

The dynamic torque measuring device 10A of the comparative example shown in FIG. 3 is a schematic diagram of a dynamic torque measuring device configured such that the load applied to the hub unit bearing 11 is applied to the rotation side member, that is, the hub wheel 12 side, as in the actual vehicle. be. In the following, the parts different from the dynamic torque measuring device 10 of the embodiment shown in FIG. 1 will be mainly described, and the same parts will be given the same reference numerals or equivalent reference numerals to simplify the detailed explanation. or omitted.

As shown in FIG. 3 , the dynamic torque measuring device 10</b>A of the comparative example includes a rotating shaft 23 rotatably supported by a plurality of angular ball bearings 21 provided in a load section 51 . 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 universal joints 52 . The load portion 51 is formed by a bearing portion 56 and a load rod 57 in the same manner as the load portion 33 of the embodiment shown in FIG. , hydraulic cylinders 38 and 39, the load is applied to the position corresponding to the center in the width direction of the tire and to the position corresponding to the radius of the tire, respectively.

A co-rotating portion 54 is fixed to the outer ring flange 13 a of the flanged outer ring 13 via a mounting jig 55 . The co-rotating portion 54 is rotatably supported by the hydrostatic bearing housing 58 in a non-contact and rotational resistance-free state by the hydrostatic bearing 32 . Also, in this case, the load cell 42 is attached to the attachment jig 55 via the measuring rod 41 .

In the dynamic torque measuring device 10A of this comparative example, the static pressure bearing 32, which is also a support bearing for supporting the load of the hub unit bearing 11, is located far from the load input position. As a result of the accompanying enlargement of the co-rotating portion 54, the moment of inertia increases, which affects the measurement of the dynamic torque. Therefore, it is difficult to measure accurately when the rotation speed changes every moment.

On the other hand, the dynamic torque measuring device 10 of the embodiment shown in FIG. Therefore, the moment of inertia of the co-rotating portion 31 can be reduced to approximately 1/10 of that of the co-rotating portion 54 of the dynamic torque measuring device 10A of the comparative example. As a result, fluctuations in the dynamic torque of the flanged outer ring 13 that accompany rotational fluctuations in the hub wheel 12 can be measured immediately and accurately. Therefore, the dynamic torque measuring device 10 of this embodiment can be suitably used for measuring the dynamic torque generated in the flanged outer ring 13 in the fuel efficiency measurement mode.

It should be noted that the present invention is not limited to the above-described embodiments, and can be modified, improved, etc. as appropriate.
For example, in the above description, the hub unit bearing 11 was described as an example of the object to be measured, but the object to be measured is not limited to the hub unit bearing 11, and may be, for example, a rolling bearing provided with a seal member.

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, the rotating member is rotationally driven to measure the dynamic torque generated in the stationary member. A dynamic torque measuring device,
a first support mechanism including a drive mechanism for rotationally driving the rotation-side member and supporting the rotation-side member;
a second support mechanism provided on the side opposite to the first support mechanism with respect to the object to be measured, and supporting the stationary member so as to rotate together with rotation of the rotary member;
with
The second support mechanism includes: a co-rotating portion that holds the fixed-side member and rotates together with the fixed-side member; and
A dynamic torque measuring device, wherein the dynamic torque is given by measuring a tangential force generated in the stationary member or the co-rotating portion.
With this configuration, the moment of inertia of the co-rotating portion can be reduced, and even in a state where the rotational speed of the rotating-side member changes from moment to moment, the dynamic torque due to co-rotating generated in the fixed-side member can be reduced. Accurate measurement is possible.

(2) the fixed-side member is a flanged outer ring of the hub unit bearing; and the rotating-side member is a hub ring of the hub unit bearing;
The dynamic torque measuring device according to (1), wherein the load applied to the load portion corresponds to a radial load and a canvas thrust load acting on a vehicle wheel.
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 for storing the object to be measured at a predetermined temperature.
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),
The dynamic torque generated in the stationary member is obtained by rotating the rotating member while the load is applied to the load portion and measuring the tangential force generated in the stationary member or the co-rotating portion. dynamic torque measurement method.
According to this configuration, it is possible to measure the dynamic torque generated in the stationary member when the rotating member is rotationally driven while a load is applied.

(5) the load applied to the load portion corresponds to a radial load and a canvas last load acting on the wheels of the vehicle;
The dynamic torque measuring method according to (4), wherein the dynamic torque is measured while changing the rotation speed of the rotation-side member.
According to this configuration, it is possible to measure the dynamic torque due to co-rotation generated in the stationary member in the fuel efficiency measurement mode.

10 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 first support mechanism 26 drive motor (driving mechanism)
30 Second support mechanism 31 Co-rotating portion 32 Hydrostatic bearing 33 Load portion 34 Mounting jig 35 Disc 50 Constant temperature bath P1 Radial load P2 Thrust load

Claims (5)

A dynamic torque measurement in which an object to be measured has a stationary member and a rotating member rotatable relative to the stationary member, and measures the dynamic torque generated in the stationary member by rotationally driving the rotating member. a device,
a first support mechanism including a drive mechanism for rotationally driving the rotation-side member and supporting the rotation-side member;
a second support mechanism provided on the side opposite to the first support mechanism with respect to the object to be measured, and supporting the stationary member so as to rotate together with rotation of the rotary member;
with
The second support mechanism includes: a co-rotating portion that holds the fixed-side member and rotates together with the fixed-side member; and
A dynamic torque measuring device, wherein the dynamic torque is given by measuring a tangential force generated in the stationary member or the co-rotating portion. The fixed side member is a flanged outer ring of the hub unit bearing, the rotating side member is the hub ring of the hub unit bearing,
2. The dynamic torque measuring device according to claim 1, wherein the load applied to the load portion corresponds to a radial load and a canvas thrust load acting on wheels of a vehicle. 3. The dynamic torque measuring device according to claim 1, further comprising a constant temperature bath for storing said object to be measured at a predetermined temperature. A dynamic torque measuring method using the dynamic torque measuring device according to any one of claims 1 to 3,
The dynamic torque generated in the stationary member is obtained by rotating the rotating member while the load is applied to the load portion and measuring the tangential force generated in the stationary member or the co-rotating portion. dynamic torque measurement method. The load applied to the load part corresponds to a radial load and a canvas last load acting on the wheels of the vehicle,
5. The dynamic torque measuring method according to claim 4, wherein the dynamic torque is measured while changing the rotation speed of the rotating member.

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