KR20180007812A - Apparatus and method for measuring moment of inertia measuring of tire - Google Patents

Abstract

The present invention discloses a device for measuring moment of inertia of a tire, and a method of measuring moment of inertia using the same. To this end, the present invention includes: a base portion extending in the first direction; a connector having one end connected to the base portion and extending in the first direction; a mounting unit connected to the other end of the connector and supporting a side wall of a tire such that a tread of the tire faces the ground surface; and an angle plate provided at a lower portion of the mounting unit so as to face the tread and configured to set a rotation angle of the tire.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and a method for measuring moment of inertia of a tire,

Embodiments of the present invention relate to an apparatus for measuring the moment of inertia of a tire and a method of measuring the moment of inertia of the tire using the same.

The vehicles that the users are traveling with are made up of many parts, among which the tires have a great effect on the driving of the vehicle, and can be said to be one of the key components for securing the safety of the user.

The tire has an inertial moment about the circumferential direction and an inertial moment about the lateral direction of the tread. In particular, since the moment of inertia with respect to the lateral direction directly affects the steering performance of the vehicle, it is important to confirm and adjust the moment of inertia with respect to the lateral direction to improve the steering performance of the tire.

The conventional method of measuring the moment of inertia of a tire can be carried out after connecting a plurality of ropes to the rim to set the equilibrium of the tire. This method takes a long time for measurement, and a large error is caused by the non-equilibrium of the tire.

Further, in the conventional method of measuring the moment of inertia, the moment of inertia of the tire in the circumferential direction can be calculated, but there is a limit that the moment of inertia in the lateral direction can not be calculated. Therefore, there is a need for an apparatus that can accurately and quickly calculate the moment of inertia and calculate the moment of inertia in the lateral direction.

The above-described background technology is technical information that the inventor holds for the derivation of the present invention or acquired in the process of deriving the present invention, and can not necessarily be a known technology disclosed to the general public prior to the filing of the present invention.

Embodiments of the present invention provide an apparatus and method for measuring moment of inertia of a tire capable of measuring an inertia moment in a lateral direction of a tire and measuring the moment of inertia quickly and accurately.

According to an aspect of the present invention, there is provided a connector comprising: a base portion extending in a first direction; a connector having one end connected to the base portion and extending in the first direction; and a tether connected to the other end of the connector, There is provided an apparatus for measuring moment of inertia of a tire, comprising a mounting unit for supporting a side wall of the tire so as to face the tire, and an angle plate provided at a lower portion of the mounting unit to face the tread and for setting a rotation angle of the tire.

The mounting unit may include a body connected to the connector, a sidewall bent at both ends of the body to enclose at least a part of the sidewall, and a joint bar inserted in the sidewall to support the sidewall.

The mounting unit may further include an anti-bending module connecting the side walls and adjusting a distance between the side walls.

The joint bar may further include a contact plate disposed between one end of the joint bar and the sidewall and having one side bent toward the sidewall.

The controller may further include a controller for calculating an inertia moment of the tire using the rotation period of the tire measured by the mounting unit.

The control unit may include a data base for storing a first moment of inertia according to a first rotation cycle of the test body, a second rotation cycle being a rotation cycle of the rim and the assembly of the tire coupled to the rim, An inertia moment estimating unit for calculating a second moment of inertia of the assembly and comparing the third rotation period as the rotation period of the rim with the first rotation period to estimate a third moment of inertia of the rim, And a moment of inertia calculating unit that calculates a difference between the second inertial moment and the third inertial moment by the inertia moment of the tire.

Further, the connector is provided in a single number, and can be twisted about the central axis in the first direction.

According to another aspect of the present invention, there is provided a connector comprising: a base portion extending in a first direction; a connector having one end connected to the base portion and extending in the first direction; A mounting unit arranged to face the side wall of the tire so as to be parallel to the one direction, a mounting unit coupled to the rim mounted on the tire, and a mounting unit mounted on the lower side of the mounting unit to face the side wall, And an angle plate for setting an inertia moment of the tire.

Further, the connector is provided in a single number, and can be twisted about the central axis in the first direction.

According to another aspect of the present invention, there is provided a method for measuring a moment of inertia of a tire, comprising the steps of: mounting a test body on an inertia moment measuring apparatus of a tire and rotating the test body at a first predetermined angle to calculate a first moment of inertia of the test body from a first rotation period of the test body; Mounting an assembly of tires coupled to the rim and the rim so that the tread faces the ground, to an inertia moment measuring device of the tire; calculating a second rotation period by rotating the assembly at the first angle; Calculating a third rotation period by rotating the rim at the first angle by mounting the rim on an inertia moment measuring apparatus of the tire; calculating a second rotation period from the first rotation period and the second rotation period, Calculating a third moment of inertia of the rim from the first rotation period and the third rotation period, and calculating the second moment of inertia The difference between the third moment of inertia provides a calculated moment of inertia of the tire comprises the step of calculating a moment of inertia of the tire.

The inertia moment measuring device of the tire further includes a base portion extending in a first direction, a connector having one end connected to the base portion and extending in the first direction, and a connector connected to the other end of the connector, A mounting unit for supporting the side wall and an angle plate installed at a lower portion of the mounting unit so as to face the tread and for setting the rotation angle so that the tire is rotated at the first angle with respect to the first direction.

The step of mounting the assembly on the inertial moment measuring device of the tire may be performed by setting a restoring force in a direction opposite to a direction in which the mounting unit applies the side wall of the tire to prevent deformation of the inertia moment measuring device of the tire have.

Other aspects, features, and advantages of the invention other than those described above will become apparent from the following drawings, claims, and the detailed description of the invention.

The apparatus and method for measuring moment of inertia of a tire according to the embodiments of the present invention are capable of measuring the moment of inertia of the tire tread in the lateral direction by installing the tread of the tire on the mounting unit so as to face the ground. In addition, the apparatus and method for measuring moment of inertia of a tire according to embodiments of the present invention can improve the efficiency because the preparation time for measurement is short, minimize the error, and improve the accuracy of the moment of inertia measurement.

1 is a side view showing an apparatus for measuring moment of inertia of a tire according to an embodiment of the present invention.
Fig. 2 is a block diagram showing the control unit of the inertia moment measuring apparatus of Fig. 1; Fig.
3 is a plan view showing the angle plate of Fig.
4 is a side view showing an apparatus for measuring moment of inertia of a tire according to another embodiment of the present invention.
5 is a perspective view illustrating an apparatus for measuring moment of inertia of a tire according to another embodiment of the present invention.
6 is a flowchart showing a method of measuring the moment of inertia of a tire by using the apparatus for measuring moment of inertia of the tire of FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention and methods of achieving them will be apparent with reference to the embodiments described in detail below with reference to the drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or corresponding components throughout the drawings, and a duplicate description thereof will be omitted .

In the following embodiments, the terms first, second, and the like are used for the purpose of distinguishing one element from another element, not the limitative meaning.

In the following examples, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

In the following embodiments, terms such as inclusive or possessive are intended to mean that a feature, or element, described in the specification is present, and does not preclude the possibility that one or more other features or elements may be added.

In the following embodiments, when a part of a film, an area, a component or the like is on or on another part, not only the case where the part is directly on the other part but also another film, area, And the like.

In the drawings, components may be exaggerated or reduced in size for convenience of explanation. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to those shown in the drawings.

If certain embodiments are otherwise feasible, the particular process sequence may be performed differently from the sequence described. For example, two processes that are described in succession may be performed substantially concurrently, and may be performed in the reverse order of the order described.

FIG. 1 is a side view showing an apparatus for measuring moment of inertia of a tire according to an embodiment of the present invention. FIG. 2 is a block diagram showing a control unit 150 of the apparatus for measuring moment of inertia 100 of the tire shown in FIG. And FIG. 3 is a plan view showing the angle plate 140 of FIG.

1 to 3, the apparatus for measuring moment of inertia of a tire 100 may include a base 110, a connector 120, a mounting unit 130, an angle plate 140, and a control unit 150 have.

The base 110 may support the connector 120, the mounting unit 130, the angle plate 140, and the controller 150 and may extend in a first direction that is the height direction. The base unit 110 includes a base plate 111 installed to face the ground and supporting the angle plate 140, a support bar 112 extending in the first direction at the base plate 111, And a support frame 113 extending to face the base plate 111. [

One end of the connector 120 may be connected to the support frame 113 and the other end may be connected to the mounting unit 130. The connector 120 extends in the first direction and may be provided in a single number. That is, only one connector 120 may extend from the support frame 113 to the mounting unit 130. The connector 120 is a device having a predetermined flexibility and is not limited to a specific configuration. For example, the connector 120 may be comprised of a plurality of wires, carbon fibers, chains, ropes, and the like.

The connector 120 can be twisted about the central axis in the first direction. The connector 120 can be twisted clockwise or counterclockwise about the first direction and then can be repetitively moved about the first direction as it is unwound or twisted about the first direction.

The mounting unit 130 may be mounted with an assembly of the rim R and the tire T. [ The mounting unit 130 may be installed such that the tire T is erected in the first direction. That is, the tire T may be disposed so that the tread faces the ground, and the sidewall may be disposed in parallel with the first direction. Since the tire T is mounted so as to stand in the first direction, the moment of inertia of the tire in the lateral direction can be measured.

The mounting unit 130 may include a body 131 connected to the other end of the connector 120, a side wall 132 connected at both ends of the body 131, and a joint bar 133 inserted into the side wall . The body 131 is extended to cover at least a part of the tread of the tire T in the thickness direction and the connector 120 is connected to the center of the body so that the mounting unit 130 rotates according to the twist of the connector 120 .

The side wall 132 may be bent in a first direction on both sides of the body 131. The side wall 132 may be installed to surround the side wall,

The joint bar 133 can support the side wall of the tire T through the side wall 132. The joint bars 133 may be arranged to face each other on both sides of the side wall 132 to fix the tire T to the mounting unit 130.

The joint bar 133 may have a contact portion to widen the contact area of the side wall. The shape of the contact portion is not limited to a specific shape, but for convenience of explanation, the case where the contact portion is provided with a hemispherical contact portion will be mainly described. The hemispherical contact portion is formed of a flexible material and can remove air in the inner space formed by the contact portion and the side wall to improve the attraction force.

The joint bar 133 can move linearly in the direction of the rotation center axis of the tire T. [ The joint bar 133 may include a knob in the form of a hand bolt to adjust the distance between the joint bars 133 facing the user. In addition, the joint bar 133 may include a linear motor (not shown) and a linear shaft (not shown) to adjust the distance between the opposing joint bars 133.

The angle plate 140 may be installed on the upper portion of the base plate 111. The rotation angle of the angle plate 140 is displayed to set the rotation angle of the tire T. 3, the mounting unit 130 may be disposed at a portion indicated by 90 degrees and 270 degrees, and the mounting unit 130 is twisted by about 20 degrees to measure the rotation period so that the mounting unit 130 ' As shown in FIG.

The control unit 150 can calculate the moment of inertia of the tire using the rotation period of the tire T measured by the mounting unit 130. [ The control unit 150 may include a database 151, an inertia moment estimating unit 152, and an inertia moment calculating unit 153. The control unit 150 may be connected to the sensor 161 for measuring the rotation period and may be connected to the display unit 162 for displaying the calculated moment of inertia or the measured rotation period.

The database 151 may store the first rotation period of the measured object or the first inertia moment of the object. The database 151 may also store a second rotation cycle of the assembly of rim R and tire T measured by the mounting unit 130 and a third rotation cycle of the rim R. [

The first rotation period of the test body may be defined as a time period during which a predetermined number of reciprocating motions is performed after the test body is mounted on the mounting unit 130 and tilted at a predetermined first angle. 151).

The first inertia moment of the test body can be calculated in the controller 150 through the inertia moment calculating equation known from the first rotation period. Since the test body is selected to have a shape capable of applying the known moment of inertia calculation formula, the speed of moment of inertia calculation can be improved. The calculated first moment of inertia may be stored in the database 151.

For example, if the test body is a square bar shape, the first moment of inertia can be calculated by the following equation (1).

m: mass of the specimen r: radius of the specimen l: length of the specimen

The second rotation cycle is defined as a time when the assembly of the rim R and the tire T is mounted on the mounting unit 130 and a predetermined number of reciprocating movements after the mounting unit 130 is twisted to the first angle , And the measured second rotation period may be stored in the database 151. [

The third rotation cycle is defined as a time when the rim R is mounted on the mounting unit 130 and a predetermined number of reciprocating movements is performed after the mounting unit 130 is twisted to the first angle, The cycle may be stored in the database 151

The inertia moment estimating unit 152 compares the first rotation cycle of the test body with the second rotation cycle of the assembly of the rim R and the tire T to determine the rim R and the tire T, It is possible to estimate the second moment of inertia of the assembly of FIG.

Since the shape of the assembly of the rim R and the tire T is not uniform, calculation of accurate inertial moment takes a long time and can not be accurately calculated. However, it is possible to estimate the second moment of inertia from the first inertia moment by comparing the first rotation period of the test body with the second rotation period of the assembly as shown in the following equation (2).

I _RT is the second moment of inertia of the assembly of rim and tire T, I _C is the first moment of inertia of the test body, T _RT is the second rotation period of the assembly, T _C is the first moment of inertia of the first Rotation cycle.

The third inertia moment may be estimated from the first inertia moment by comparing the first rotation period of the test object with the third rotation period of the rim R as shown in the following equation (3).

I _R is the third moment of inertia of the rim, I _C is the first moment of inertia of the specimen, T _R is the third rotation cycle of the assembly, and T _C is the first rotation cycle of the specimen.

The inertia moment estimating section 152 can estimate the moment of inertia of the rim R or the tire T assembly or the rim R which is difficult to calculate due to its complicated shape from the moment of inertia of the test object, .

The moment of inertia calculation section 153 can calculate the moment of inertia of the tire T from the second moment of inertia of the rim R and the tire T assembly and the third moment of inertia of the first rim R . The second moment of inertia is defined as the sum of the moment of inertia of the rim R and the moment of inertia of the tire T so that the difference between the second moment of inertia and the third moment of inertia is defined as T ) C of the moment of inertia.

Unit: S T1 T2 T3 T / cycle T ^ 2 Test body 63.07 63.12 63.07 6.31 39.82 Tiree Rim 58.85 58.76 58.91 5.88 34.62 Tire + Rim 169.51 169.39 169.76 16.96 287.48 Tire B Rim 58.85 58.76 58.91 5.88 34.62 Tire + Rim 169.76 169.88 169.58 16.974 288.12

Izz Tire (Izz) Tiree Rim 0.5038 0.9480 Tire + Rim 1.4519 Tire B Rim 0.5038 0.9496 Tire + Rim 1.4535

Referring to Tables 1 and 2, the time required for 20 reciprocating motions is calculated by twisting the specimen at 20 degrees, and the first moment of inertia is calculated as 0.540069 using the first rotation period and Equation (1). The moment of inertia of the tire A and the rim assembly can be calculated from the rotation cycle of the tire A and the rim assembly and the inertia moment of the tire B and the rim assembly can be calculated from the rotation cycle of the tire B and the rim assembly in the same manner. The difference between the moment of inertia and the inertia moment of the rim can be calculated by the moment of inertia of the tire A and the tire B.

In order to calculate the inertia moment of a conventional tire, a plurality of ropes were connected to the rim of the tire, and the rope was twisted to calculate the rotation period to measure the moment of inertia. That is, in the conventional method, since the rotation period is measured in a state where the rim of the tire is disposed so as to face the ground, the inertial moment in the radial direction of the tire can be measured and the moment of inertia in the lateral direction of the tire tread can not be measured .

The moment of inertia of the tire tread in the left and right direction is related to the leaning or inertia force at the time of running. That is, the moment of inertia of the tire tread in the left-right direction is important as a factor that determines the steering performance of the vehicle. The apparatus for measuring moment of inertia of a tire 100 according to an embodiment of the present invention can measure the moment of inertia of the tire T in the lateral direction since the tread of the tire T can be installed facing the ground.

A conventional method of measuring the moment of inertia of a tire connects a plurality of ropes to the rim and twists the rim to measure the rotation period. At this time, since the rim and the tire must be kept parallel to the ground, a considerable preparation time is required to set it, and the resultant value may have a large error range depending on the setting state of the tire.

An apparatus for measuring moment of inertia of a tire 100 according to an embodiment of the present invention is characterized in that one connector 120 of a tire T is connected to a mounting unit 130 so that a state in which the tire T is parallel to the ground, Can be easily maintained. Accordingly, the apparatus for measuring moment of inertia 100 of a tire, which is one embodiment of the present invention, can improve the efficiency because the preparation time for measurement is short, minimize the error, and improve the accuracy of the moment of inertia measurement.

4 is a side view showing an apparatus 200 for measuring the moment of inertia of a tire according to another embodiment of the present invention.

Referring to FIG. 4, the apparatus 200 for measuring moment of inertia of a tire may include a base 110, a connector 120, an angle plate 140, and a mounting unit 230.

The mounting unit 230 can be mounted with an assembly of the rim R and the tire T at which the moment of inertia is measured. The mounting unit 230 may include a body 231, a side wall 232, a joint bar 233, a bending prevention portion 234, a moving block 235, a contact plate 236, and a support bar 237 have. The mounting unit 230 can be installed such that the tire T is erected in the first direction. That is, the tire T may be disposed so that the tread faces the ground, and the sidewall may be disposed in parallel with the first direction. Since the tire T is mounted so as to stand in the first direction, the moment of inertia of the tire in the lateral direction can be measured.

The mounting unit 230 includes a body 231 connected to the other end of the connector 120, a side wall 232 connected at both ends of the body 231, and a joint bar 233 inserted into the side wall 232 can do. The body 231 extends to cover at least a part of the tread of the tire T in the thickness direction and the connector 120 is connected to the center of the body so that the mounting unit 230 also rotates according to the twist of the connector 120 .

The sidewalls 232 may be bent in a first direction on both sides of the body 231. The side wall 232 may be installed to enclose the side wall,

The joint bar 233 can support the side wall of the tire T through the side wall 232. The joint bars 233 can be arranged to face each other on both sides of the side wall 232 to fix the tire T to the mounting unit 230. [

The joint bar 233 can linearly move in the rotation center axis direction of the tire T. [ The joint bar 233 may include a hand bolt knob to adjust the distance between the joint bars 233 facing the user. The joint bar 233 may include a linear motor (not shown) and a linear shaft (not shown) to adjust the distance between the opposing joint bars 233.

The anti-bending portion 234 can connect between the side walls 232 and adjust the distance between the side walls 232. That is, the bending prevention portion 234 can adjust the distance between the side walls 232, so that the force exerted by the joint bar 233 can be dispersed to prevent the mounting unit 230 from being deformed. When the joint bar 233 is moved toward the sidewall, the tire T forms a restoring force and can transmit the restoring force to the mounting unit 230 again. The bending prevention portion 234 can adjust the distance between the both side walls 232 and support the both side walls 232 so that the side walls are not bent by the restoring force to be transmitted.

The moving block 235 can move linearly along the longitudinal direction of the bending prevention portion 234. [ The moving block supports one side of the contact plate 236 and the external force transmitted by the joint bar 233 can be dispersed in the contact plate 236 to improve the contact force of the contact plate 236 supporting the side wall 236 . When the joint bar 233 moves to support the contact plate 236, the moving block 235 can move along the bending prevention portion 234.

The contact plate 236 may be installed between one end of the joint bar 233 and the sidewall. The contact plate 236 can disperse the external force transmitted by the joint bar 233 to improve the contact area of the side wall and disperse the external force, thereby improving the contact force.

One side 236a of the contact plate 236 may be formed to be bent toward the side wall of the tire T. [ The lower portion of the side wall of the tire T, that is, the portion contacting the rim R, has a shape recessed inward. One side 236a of the bent contact plate 236 contacts the region adjacent to the rim R to improve the contact force between the side wall and the contact plate 236 so that the tire T is fixed to the mounting unit 230 Respectively.

The support bars 237 connect between the side walls 232 and may be installed in parallel with the anti-bending portions 234. The support bar 237 can prevent deformation of the side wall 232 that can occur when the joint bar 233 applies force to the side wall of the tire T. [

5 is a perspective view showing an apparatus 300 for measuring moment of inertia of a tire according to another embodiment of the present invention.

Referring to FIG. 5, an apparatus 300 for measuring moment of inertia of a tire may include a base 110, a connector 120, an angle plate 140, and a mounting unit 330.

The mounting unit 330 can be mounted with an assembly of the rim R and the tire T at which the moment of inertia is measured. The mounting unit 330 can be installed so that the side wall of the tire T faces the ground. The mounting unit 330 can measure the radial moment of inertia of the tire T. [

The mounting unit 330 includes a body 331 coupled to the rim R, a coupling groove 332 into which the coupling member is inserted to fix the body 331 and the rim R, As shown in FIG.

The tire T is mounted on the mounting unit 330 and the inertia moment of the tire T in the radial direction can be measured by twisting the first direction clockwise or counterclockwise about the central axis.

An apparatus 300 for measuring moment of inertia of a tire which is an embodiment is characterized in that a plurality of connectors 120 of a tire T are connected to a mounting unit 330 so that the tire T can easily maintain a parallel state or a balanced state with respect to the ground . Therefore, the inertial moment measuring apparatus 300 of the present invention, which is an embodiment of the present invention, can improve the efficiency by improving the efficiency of measurement by shortening the preparation time for measurement, minimizing the error and improving the accuracy of the moment of inertia measurement.

6 is a flowchart showing a method of measuring the moment of inertia of a tire using the apparatus for measuring moment of inertia 100 of the tire of FIG.

Referring to FIG. 6, a method for measuring a moment of inertia of a tire includes the steps of measuring a first moment of inertia of a test object (S10), mounting the rim and tire assembly to an inertia moment measuring device (S20), rotating the rim and tire assembly Calculating a rotation period of the rim (S40), calculating a second inertial moment of the rim and the tire assembly and a third inertial moment of the rim (S50), and calculating a moment of inertia of the tire (Step S60).

The step S10 of measuring the first moment of inertia of the test body is carried out by mounting the test body on the inertia moment measuring apparatus 100 of the tire and measuring the first rotation period from the time when it is twisted at the first angle and is subjected to a predetermined number of reciprocating movements And the first moment of inertia of the test body can be calculated using this.

Step S20 of mounting the rim and tire assembly to the moment of inertia measuring device mounts the rim and tire assembly on the mounting unit 130 such that the tread of the tire T faces the ground. At this time, the moving block 235 can prevent the deformation of the mounting unit 230 by setting the restoring force in the direction opposite to the direction in which the mounting unit 130 applies the sidewall of the tire T. That is, the moving block linearly moves to the bending prevention portion 234 in the moving direction of the joint bar 233 to support the contact plate 236 and prevent deformation of the side wall 232 (see FIG. 4).

The step (S30) of calculating the rotation period of the rim and the tire assembly may include measuring the time taken for a predetermined number of reciprocating motions to be made at the second rotation period by twisting the mounting unit 130 equipped with the rim and tire assembly to the first angle .

The step S40 of calculating the rotation period of the rim mounts the rim R to the mounting unit 130. The mounting unit 130 deflects to the first angle and rotates the time taken for a predetermined number of reciprocating movements to the third rotation It can be measured in cycles.

Calculating the second moment of inertia of the rim and tire assembly and the third moment of inertia of the rim (S50) comprises comparing the first rotation period and the second rotation period to calculate the third moment of inertia of the rim and tire assembly The second moment of inertia can be estimated. The third inertial moment of the rim can be estimated from the first inertia moment by comparing the first rotation period and the third rotation period.

The step of calculating the moment of inertia of the tire (S60) may calculate the moment of inertia of the tire (T) by calculating the difference between the second moment of inertia and the moment of inertia of the third moment.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the exemplary embodiments, and that various changes and modifications may be made therein without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: Tire inertia moment measuring device
110: Base portion
120: connector
130: mounting unit
140: Angle plate
150:

Claims (12)

A base portion extending in a first direction;
A connector having one end connected to the base portion and extending in the first direction;
A mounting unit connected to the other end of the connector and supporting a sidewall of the tire such that the tread of the tire faces the ground; And
And an angle plate installed at a lower portion of the mounting unit so as to face the tread, and configured to set a rotation angle of the tire. The method according to claim 1,
The mounting unit
A body connected to the connector;
A sidewall bent at both ends of the body to enclose at least a part of the sidewall; And
And a joint bar inserted in the side wall to support the side wall. 3. The method of claim 2,
The mounting unit
And a bending prevention portion connecting the side walls and adjusting the distance between the side walls. 3. The method of claim 2,
And a contact plate disposed between one end of the joint bar and the sidewall and having one side bent toward the sidewall. The method according to claim 1,
And a control unit for calculating an inertia moment of the tire using the rotation period of the tire measured by the mounting unit. 6. The method of claim 5,
The control unit
A database for storing a first moment of inertia according to a first rotation period of the test body;
Wherein the second inertia moment of the assembly is calculated by comparing the first rotation period and the second rotation period which is the rotation period of the assembly of the tire coupled to the rim and the rim, An inertia moment estimator for comparing the first rotation period to estimate a third moment of inertia of the rim; And
And a moment of inertia calculating section that calculates a difference between the second moment of inertia and the third moment of inertia as an inertia moment of the tire. The method according to claim 1,
Wherein the connector is provided in a single number and can be twisted about the central axis in the first direction. A base portion extending in a first direction;
A connector having one end connected to the base portion and extending in the first direction;
A mounting unit connected to the other end of the connector and arranged to face a sidewall of the tire so that a rotation axis of the tire is parallel to the first direction and to be coupled to a rim mounted on the tire; And
And an angle plate provided at a lower portion of the mounting unit so as to face the side wall, the angle plate setting a rotation angle of the tire. 9. The method of claim 8,
Wherein the connector is provided in a single number and can be twisted about the central axis in the first direction. Calculating a first moment of inertia of the test piece from a first rotation period of the test piece by mounting the test piece on a torsional moment measuring device of the tire and rotating the test piece at a first predetermined angle;
Mounting an assembly of tires coupled to the rim and the rim to the inertial moment measuring device of the tire such that the tread of the tire faces the ground;
Rotating the assembly at the first angle to calculate a second rotation period;
Mounting the rim on the inertial moment measuring apparatus of the tire and rotating the rim at the first angle to calculate a third rotation period;
Calculating a second moment of inertia of the assembly from the first rotation period and the second rotation period and calculating a third moment of inertia of the rim from the first rotation period and the third rotation period; And
And calculating a difference between the second moment of inertia and the third moment of inertia as an inertia moment of the tire. 11. The method of claim 10,
The inertia moment measuring apparatus of the tire,
A base portion extending in a first direction;
A connector having one end connected to the base portion and extending in the first direction;
A mounting unit connected to the other end of the connector and supporting a side wall of the tire; And
And an angle plate installed at a lower portion of the mounting unit so as to face the tread and setting an angle of rotation such that the tire is rotated at the first angle with respect to the first direction. 11. The method of claim 10,
The step of mounting the assembly on the inertia moment measuring apparatus of the tire includes:
And the restoring force is set in a direction opposite to a direction in which the mounting unit applies the sidewall of the tire to prevent deformation of the inertia moment measuring device of the tire.

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