JP2002310839A - Tire balance adjustment device, tire balance adjustment method and tire balance measurement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire balance adjustment device, a tire balance adjustment method and a tire balance measurement method capable of correcting secondary mass unbalance of a rim-mounting tire. SOLUTION: Primary unbalance mass UB1 and a primary unbalance position ϕ1 are calculated based on torque generated around two or more axes perpendicular to a tire rotation axis. Secondary unbalance mass UB2 and a secondary unbalance position ϕ2 are calculated based on moments of inertia generated around three or more axes perpendicular to the tire rotation axis and the calculation result. The weight values BW2 and mounting positions ϕB2 and ϕB2 +π of secondary correction weights 26B are calculated based on the primary and secondary unbalance masses and the primary and secondary unbalance positions. By sticking the correction weights 26A and 26B to the tire based on the results, the secondary mass unbalance of the tire can be adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire balance adjusting device for adjusting a mass unbalance of a rim-mounted tire, a tire balance adjusting method, and a tire unbalance measuring method.

[0002]

2. Description of the Related Art As a conventional method for adjusting the mass imbalance of a rim-mounted tire, for example, Japanese Patent Application No. 7-198603 is disclosed.
There is a method for correcting an unbalance of a tire described in Japanese Patent Application Laid-Open No. H10-26095.

As shown in FIG. 9, according to this method, first, two virtual axes 2 which intersect with the tire axis I and pass on the tire equatorial plane and are separated at equal angles in the tire circumferential direction.
00 (only one is shown) is provided.

[0004] With each axis 200 as the center of rotation,
One part 204 of the tire 204 virtually divided into two parts by an axis plane 202 including the axis center 200 and orthogonal to the tire equatorial plane.
A moment difference M = M1−M2 between the moment M1 around the axis center due to the weight of L and the moment M2 due to the weight of the other portion 204R is measured.

[0005] Next, on the inner surface of the tread portion in the tire portion on the side where the moment becomes small, and at the position where the tire equatorial plane intersects with the plane 206 including the tire axis I and perpendicular to the axis plane 202. A correction weight 208 having a predetermined weight is attached to each shaft core 200.

On the other hand, the measured mass imbalance is divided into N equal parts (N = 3 or more) around the starting point, and N-1 excluding the starting point.
A method of attaching a correction weight to a portion has also been proposed.

However, any of the above methods of adjusting the mass imbalance of the rim-assembled tire is a correction of the primary mass imbalance in which the mass around the tire rotation axis is non-uniform, and the primary mass imbalance is corrected. Even though it was possible, the secondary mass imbalance could not be corrected.

For this reason, there has been a problem that a part of the outer diameter of the tire protrudes outside due to uneven centrifugal force generated due to uneven mass distribution of the tire. Further, there is a problem that the gyro effect at the time of steering is changed due to the change of the moment of inertia around the steering axis.

[0009]

In view of the above fact, the present invention corrects the secondary mass imbalance of the rim-assembled tire to make the outer diameter of the tire uniform, thereby making the outer diameter of the tire uniform around the steering axis. It is an object of the present invention to provide a tire balance adjustment device, a tire balance adjustment method, and a tire unbalance measurement method which can reduce the fluctuation of the gyro effect at the time of steering caused by the fluctuation of the inertia moment.

[0010]

According to a first aspect of the present invention, there is provided a tire balance adjusting apparatus for adjusting a mass imbalance of a rim-mounted tire, wherein at least two axes perpendicular to a tire rotation axis are provided. Calculating a first unbalance mass at which the mass distribution of the rim-assembled tire becomes non-uniform and a first unbalance position at which the mass distribution becomes non-uniform around the rotation axis of the tire based on the torque generated around the axis of the tire. Calculation means, and a mass distribution of the rim-assembled tire around the rotation axis of the tire based on a moment of inertia generated around at least three axes orthogonal to the tire rotation axis and a calculation result by the first calculation means. The secondary unbalance mass that becomes uniform and the secondary unbalance position that makes the mass distribution non-uniform are calculated, and the secondary unbalance mass and the secondary unbalance are calculated. A second calculating means for calculating a weight amount and a mounting position of the correction weight for adjusting the secondary mass imbalance based on the position and the calculation result by the first calculating means. .

Next, the operation and effect of the tire balance adjusting device according to the first aspect will be described.

In a conventional tire balance adjusting device, for example, a rim-assembled tire is mounted on a balancer, and by rotating the rim-assembled tire, the primary unbalanced mass, which is non-uniform in mass around the tire axis, and its position. A certain primary imbalance position was specified. Then, the operator adjusts the primary mass unbalance by attaching a correction weight of a weight amount that balances with the primary unbalance mass at the primary unbalance position.

However, this method has a problem that the primary mass imbalance can be corrected but the secondary mass imbalance cannot be corrected.

The term "primary mass imbalance" refers to the displacement of the center of gravity with respect to the tire rotation axis, and the term "secondary mass imbalance" refers to the unbalance between two principal inertia moments of inertia perpendicular to the tire rotation axis. Say.

Therefore, in the tire balance adjusting device according to the present invention, the first arithmetic means firstly sets the rim around the rotation axis of the tire based on the torque generated around at least two or more axes orthogonal to the tire rotation axis. The primary unbalance mass at which the mass distribution of the assembled tire becomes non-uniform and the primary unbalance position at which the mass distribution becomes non-uniform are calculated.

The above-mentioned torque may be measured, for example, by a well-known torque sensor provided inside the tire balance adjusting device, or a torque measured by a measuring device independent of the tire balance adjusting device is supplied to the tire balance adjusting device. You may enter it.

Next, in the second calculating means, based on the moment of inertia generated around at least three or more axes perpendicular to the tire rotation axis and the calculation result by the first calculating means, the second calculating means calculates the moment of inertia around the rotation axis of the tire. A secondary unbalance mass at which the mass distribution of the rim-assembled tire becomes non-uniform and a secondary unbalance position at which the mass distribution becomes non-uniform are calculated, and the secondary unbalance mass and the secondary unbalance position are calculated by the first calculating means. The weight amount and the mounting position of the correction weight are calculated based on the calculation result.

The moment of inertia is also similar to the torque,
The measurement may be performed by a measuring unit provided in the tire balance adjustment device, or the moment of inertia measured by a measurement device independent of the tire balance adjustment device may be input to the tire balance adjustment device.

Then, based on the calculation results of the first and second calculation means, a correction weight of a predetermined correction weight amount is attached to a tire at a predetermined mounting position.

The secondary mass imbalance of the tire can be adjusted by attaching the correction weight to the tire based on the calculation result by the tire balance adjusting device of the present invention.

As a result, it is possible to reduce the possibility that a part of the outer diameter of the tire protrudes outside due to uneven centrifugal force generated due to uneven mass distribution of the tire. That is, the protrusion of the outer diameter of the tire can be made uniform.

Further, it is possible to reduce the fluctuation of the gyro effect at the time of steering caused by the fluctuation of the moment of inertia around the steering axis.

According to a second aspect of the present invention, there is provided a tire unbalance measuring method for measuring a mass unbalance generated in a rim-mounted tire and a position thereof, wherein at least two tires are perpendicular to a tire rotation axis. A torque generated around an axis equal to or more than the axis is measured, and based on the measurement result, a primary unbalanced mass and a non-uniform mass distribution of the rim-assembled tire around the rotation axis of the tire become non-uniform. A first calculation step of calculating a next unbalance position, and measuring an inertia moment generated around at least three axes orthogonal to the tire rotation axis, based on the measurement result and the calculation result of the first calculation step. And the secondary unbalance mass that makes the mass distribution of the rim-assembled tire non-uniform around the rotation axis of the tire and the secondary imbalance that makes the mass distribution non-uniform A second calculation step of calculating the scan position, that it consists characterized.

Next, the operation and effect of the tire imbalance measuring method according to the second aspect will be described.

In the first calculation step, torque generated around at least two axes orthogonal to the tire rotation axis is measured, and based on the measurement result, the mass of the rim-mounted tire around the tire rotation axis is measured. The primary unbalance mass at which the distribution becomes non-uniform and the primary unbalance position at which the mass distribution becomes non-uniform are calculated.

In the second measuring step, the moment of inertia generated around at least three or more axes perpendicular to the tire rotation axis is measured, and the tire rotation is determined based on the measurement result and the calculation result in the first calculation step. A secondary unbalanced mass around the axis at which the mass distribution of the rim-mounted tire becomes non-uniform and a secondary unbalanced position at which the mass distribution becomes non-uniform are calculated.

Based on the calculation results in the first and second calculation steps, a correction weight having a predetermined correction weight amount is attached to a predetermined position, so that only the primary mass unbalance generated in the rim-mounted tire is obtained. In addition, the secondary mass imbalance can be adjusted.

According to a third aspect of the present invention, there is provided a tire balance adjusting method for adjusting a mass imbalance of a rim-mounted tire, which is generated around at least two or more axes orthogonal to the tire rotation axis. Measuring a torque, and calculating a primary unbalance mass at which the mass distribution of the rim-mounted tire becomes non-uniform and a primary unbalance position at which the mass distribution becomes non-uniform around the rotation axis of the tire based on the measurement result. 1) calculating an inertia moment generated around at least three or more axes orthogonal to the tire rotation axis, based on the measurement result and the calculation result in the first calculation step. The secondary unbalance mass at which the mass distribution of the rim-assembled tire becomes non-uniform and the secondary unbalance position at which the mass distribution becomes non-uniform are calculated, and the secondary unbalance is calculated. A second calculating step of calculating a weight amount and a mounting position of the correction weight for adjusting the secondary mass imbalance based on the lance mass and the secondary unbalance position and the calculation result of the first calculating step. Features.

Next, the operation and effect of the tire balance adjusting method according to the third aspect will be described.

In the first calculation step, torque generated around at least two axes orthogonal to the tire rotation axis is measured, and the mass of the rim-mounted tire around the rotation axis of the tire is measured based on the measurement result. The primary unbalance mass at which the distribution becomes non-uniform and the primary unbalance position at which the mass distribution becomes non-uniform are calculated.

In the second calculation step, the moment of inertia generated around at least three axes orthogonal to the tire rotation axis is measured, and the tire rotation is calculated based on the measurement result and the calculation result in the first calculation step. A secondary unbalance mass at which the mass distribution of the rim-assembled tire around the axis becomes non-uniform and a secondary unbalance position at which the mass distribution becomes non-uniform are calculated, and the secondary unbalance mass, the secondary unbalance position, and the first The weight amount and the mounting position of the correction weight for adjusting the secondary mass imbalance are calculated based on the calculation result of the calculation step.

Based on the calculation results of the first and second calculation steps, a correction weight of a predetermined correction weight amount is attached to a predetermined mounting position of the tire.

According to the tire imbalance adjusting method of the present invention, by attaching the correction weight to the tire,
The secondary mass imbalance of the tire can be adjusted.

As a result, it is possible to reduce the possibility that a part of the outer diameter of the tire protrudes outside due to the non-uniform centrifugal force caused by the non-uniform mass distribution of the tire. That is, the protrusion of the outer diameter of the tire can be made uniform.

Further, it is possible to reduce the fluctuation of the gyro effect at the time of steering caused by the fluctuation of the moment of inertia around the steering axis.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tire balance adjusting device according to one embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the tire balance adjusting device 10 (balancer 10) includes a box-shaped balancer body 12.

The balancer body 12 is fixed to the column 14 such that the axial direction thereof is substantially parallel to the floor (not shown).

A circular hole 16 is formed in the lower surface 12A of the balancer body 12. The rotary shaft 18 penetrates the circular hole 16. The axis of the rotary shaft 18 is set to coincide with the direction of gravitational acceleration (the direction of arrow A in FIG. 1).

A bearing (not shown) is provided inside the balancer body 12, and the rotating shaft 18 is rotatably supported by the bearing.

The bearing has a well-known torque sensor 19 which can measure a torque around an X-axis and a Z-axis orthogonal to a rotation shaft 18 (tire rotation axis: defined as Y-axis) extending in the direction of gravitational acceleration. (See FIG. 2).

In the present embodiment, the X axis and the Z axis are orthogonal to each other, and the opening angle is 90 degrees.

A drive motor (not shown) is provided inside the balancer main body 12, and a gear (not shown) attached to a drive shaft (not shown) of the drive motor is provided on the rotation shaft 18. It engages with a gear (not shown) provided at the end. Therefore, when the drive motor operates, the rotating shaft 18 rotates.

The rim-mounted tire 20 is attached to the rotating shaft 18 and is fixed from below by a fixing tool 22 so that the rim-mounted tire 20 does not come off from the rotating shaft 18 by rotation.

On the other hand, an input device 24 (panel 2) for inputting predetermined data is provided on the side surface 12B of the balancer body 12.
4), and a display device 28 (monitor 28) is provided near the panel 24 for displaying the amount of weight of the correction weight 26 (see FIG. 8) to be attached to the rim-assembled tire 20 and the mounting position thereof. Have been.

Also, as shown in FIG.
Is provided with a control unit 30. This control unit 30
Is composed of a central processing unit 32 (CPU 32) and a storage device 34 (RAM 34).

The torque sensor 19 and the CPU 3
2, the RAM 34, the monitor 28, and the panel 24
Each is electrically connected to each other through a bus 36.

Next, a method of adjusting the tire balance using the balancer 10 will be described with reference to the flowchart shown in FIG.

First, as shown in FIG. 1, a rim-mounted tire 20 without mass unbalance correction is mounted on the rotating shaft 18 of the balancer 10. At this time, the rim-assembled tire 20 is fixed by the fixture 22 in order to prevent the rim-assembled tire 20 from dropping.

In a state where the rim-mounted tire 20 is not rotated, the unbalance torque T _X generated around the X axis and the unbalance torque T _z generated around the Z axis are measured by the torque sensor 19. . This measurement result is
It is stored in M34.

It is to be noted that the unbalanced torque T _X generated around the X axis and the Z
The unbalanced torque T _z generated around the axis may be measured, and this value may be input to the balancer 10 through the panel 24.

Next, the drive motor is operated to rotate the rim-mounted tire 20 in the direction of arrow B in FIG.

Here, in step 100, a calculation process of the primary mass imbalance of the rim-mounted tire 20 is executed. (Calculation processing of primary mass imbalance) Based on the measurement results of the torque T _X and the torque T _z , the CPU 32
The primary unbalance mass and the primary unbalance phase are respectively calculated.

The primary unbalance mass is calculated as follows.

The primary unbalance mass is UB _1, and its phase is Φ ₁ (opening angle Φ ₁ from the Z axis) with reference to the Z axis.
Then, between the torques T _X and T _Z and the primary unbalance mass UB ₁ ,

[0056]

(Equation 1)

The following relationship is established.

Using this relationship, the primary unbalance mass UB ₁ is

[0059]

(Equation 2)

As a result,

[0061]

(Equation 3)

Is calculated.

On the other hand, the primary unbalance phase Φ ₁ is

[0064]

(Equation 4)

As a result,

[0066]

(Equation 5)

Is calculated.

The primary unbalance masses UB ₁ and UB 1
The next unbalance phase Φ ₁ is stored in the RAM 34.

FIG. 4 shows the primary unbalance mass UB ₁ and the primary unbalance phase Φ ₁ . (Calculation processing of secondary mass imbalance)
At 10, a secondary mass unbalance measurement process is performed.

[0070] First, a well-known measuring device 38 provided separately from the balancer 10 (see FIG. 7), the moment of inertia I _X around the X axis, the moment of inertia I _Z around the Z-axis, X-axis from the Z axis The moment of inertia I _{Z ′} around the Z ′ axis (the intermediate axis between the X axis and the Z axis) rotated 45 ° to the side is measured.

The measurement results of the respective moments of inertia are input from the panel 24 and stored in the RAM 34.

The moments of inertia I _X , I _Z , I
_{Z ′} may be measured by a well-known measuring device provided inside the balancer 10, and the measurement result may be used in later arithmetic processing.

Each of the above moments of inertia I _X , I _Z , I _{Z ′} is
These values include the primary and secondary mass imbalances, respectively.

Here, the moments of inertia around the X-axis, Z-axis and Z′-axis, which do not include the primary and secondary mass imbalances, are represented by i
_Assuming that _S , the above moments of inertia I _X , I _Z , I _{Z ′} are
Primary unbalance mass UB ₁ , primary unbalance phase Φ _{1 based on} Z axis (open angle from Z axis) Secondary unbalance mass UB ₂ , secondary unbalance phase Φ based on Z axis ₂ (opening angle from Z axis)

[0075]

(Equation 6)

Is obtained.

Next, the difference between I _Z and I _X is determined, and the secondary mass unbalance (secondary unbalance mass UB ₂ , secondary unbalance phase Φ ₂ ) is calculated.

[0078]

(Equation 7)

As a result,

[0080]

(Equation 8)

Is obtained.

Next, when I _{Z ′} is solved for i _s ,

[0083]

(Equation 9)

Is obtained.

[0085] Then, when the i _s is assigned to the sum of the I _Z and I _X,

[0086]

(Equation 10)

## EQU10 ##

Next, the secondary unbalance mass UB ₂ ,
When the next unbalance phase Φ ₂ is obtained,

[0089]

[Equation 11]

Is calculated.

In practice, the secondary unbalance phase Φ
_In addition to ₂ , Φ ₂ + π is calculated as a secondary unbalance phase with reference to the Z axis.

The calculated secondary unbalance mass UB
₂ and the secondary unbalanced phase Φ ₂ , Φ ₂ + π are stored in the RAM 34
Is stored.

Further, the present invention is not limited to the above-described specific example, and the three phases (X
(Second axis, Z axis, Z ′ axis) or more, the secondary mass imbalance can be specified.

Here, the moment of inertia I _X about each axis is
As a method for measuring I _Z and I _{Z ′} , measurement is performed by a conventionally known measuring device.

[0095] As the measurement principle, for example, as shown in FIG. 7, the moment of inertia i _m of the measuring device 38, the radius r _p of the pendulum 40, the mass m _p of the pendulum 40, the pendulum 40 inertia i _p, with respect to the Z axis Assuming the period f _{Z of the} pendulum 40, the inertia moment I _Z around the Z axis is

[0096]

(Equation 12)

Is obtained.

By using the above-described measurement principle and using the rim-mounted tire 20 instead of the pendulum 40, the measuring device 38 can easily measure the moment of inertia I _Z of the rim-mounted tire 20 around the Z axis. Can be.

Note that the moment of inertia I _X about the X axis is
The moment of inertia I _{Z ′} about the Z ′ axis can be measured in the same manner.

FIG. 5 shows the secondary unbalance mass UB ₂ and the secondary unbalance phases Φ ₂ , Φ ₂ + π. (Process of Correcting Primary Mass Unbalance and Secondary Mass Unbalance) When the calculation process of the primary mass unbalance and the secondary mass unbalance is completed, in step 120,
Correction processing of the primary mass unbalance and the secondary mass unbalance is executed.

In the correction processing of the primary mass imbalance, 1
The weight amount of the next modified weight 26A (see FIG. 5) is BW
₁(= UB₁) And its mounting position with respect to the Z axis
(Φ ₁+ Π).

The calculated weight amount BW ₁ of the primary correction weight 26 A and its mounting position (phase (Φ ₁ + π)) are stored in the RAM 34.

The weight BW of the primary correction weight 26A
FIG. 5 shows ₁ and its mounting position (phase Φ _B1 ).

On the other hand, in the correction processing of the secondary mass imbalance, the weight amount BW ₂ of the secondary correction weight 26B and Z
The mounting position (phase (Φ _B2 ) (displayed as an opening angle from the Z axis)) with respect to the axis is calculated.

Here, in order to obtain the weight amount BW ₂ of the secondary correction weight 26B and its mounting position (phase (Φ _B2 )), the inertia moment I _X about the X axis and the inertia moment I about the Z axis are obtained. since it are equal and _Z, and the weight amount BW ₂ of the secondary modified weights 26B, when the mounting position (phase) and relative to the Z-axis ([Phi _B2),

[0106]

(Equation 13)

Is obtained.

In addition, since the product of inertia I _{XZ on} the XZ axis only needs to be zero,

[0109]

[Equation 14]

Is obtained.

Next, when the weight amount BW ₂ of the secondary correction weight 26B is obtained,

[0112]

(Equation 15)

Is obtained.

When the phase Φ _B2 is obtained,

[0115]

(Equation 16)

Is obtained.

In addition to the phase Φ _B2 , Φ _B2 + π with respect to the Z axis is also 2 as the mounting position of the secondary correction weight 26B.
It is calculated as the mounting position (phase) of the next correction weight 26B.

The calculated weight BW ₂ of the secondary correction weight 26B and its phases Φ _B2 , Φ _B2 + π are stored in the RAM.
34.

Weight BW of secondary modified weight 26B
FIG. 6 shows ₂ and its mounting position (phase Φ _B2 , Φ _{B 2} + π).

The primary unbalance mass UB ₁ , the primary unbalance phase Φ ₁ , the weight BW ₁ (= UB ₁ ) of the primary correction weight, and its mounting position (phase Φ _B1 ( = Φ ₁ + π)) secondary unbalance mass UB ₂ , secondary unbalance phase Φ ₂ , Φ ₂ + π, weight BW ₂ of secondary correction weight 26B, and its mounting position (phase (Φ _B2 , Φ _B2 + Π)) are displayed on the monitor 28.

The weight amount BW ₁ of the primary correction weight 26A specified as described above, its mounting position (phase (Φ _B1
= Φ ₁ + π)) Based on the weight amount BW ₂ of the secondary correction weight 26B and its mounting position (phase (φ _B2 , φ _B2 + π)), the operator can attach the respective correction weights 26A to the rim-mounted tire 20, Paste 26B.

Here, a double-sided adhesive tape (manufactured by Nitto Denki, tire width direction length 50 mm × thickness 1 mm (tire width direction length and thickness is unchanged)) is used as the correction weight 26, and a predetermined weight amount is used. The length of the double-sided adhesive tape in the tire circumferential direction is adjusted so that

The "length in the tire width direction" refers to the dimension in the tire width direction when the double-sided adhesive tape is attached to the tire, and the "length in the tire circumferential direction" refers to the case where the double-sided adhesive tape is applied to the tire. It refers to the dimension in the tire circumferential direction when attached.

In the present embodiment, the primary correction weight 26A
In mass and adjust the tire circumferential direction length of the double-sided adhesive tape such that BW _1, the mass in the secondary modification weights 26B to adjust the tire circumferential direction length of the double-sided adhesive tape such that BW _2.

As shown in FIG. 8, the operator attaches the double-sided adhesive tape to the mounting position on the inner liner side on or near the tire equator line CL of the rim-mounted tire 20 while watching the display on the monitor 28. wear.

In the present embodiment, the primary correction weight 26A
Phase is Φ _B1Paste where
Double-sided adhesive tape as a secondary correction weight 26B
Is phase Φ_B2And Φ_B2Attached to each position that becomes + π
I can.

As described above, according to the tire balance adjusting method using the tire balance adjusting apparatus 10 of the present invention,
Not only the primary mass imbalance, but also the secondary mass imbalance can be adjusted.

As a result, it is possible to reduce the possibility that a part of the outer diameter of the rim-mounted tire 20 protrudes outside due to the non-uniform centrifugal force caused by the non-uniform mass distribution of the rim-mounted tire 20. That is, the rim assembled tire 2
The protrusion of the outer diameter of 0 can be made uniform.

Further, the fluctuation of the gyro effect at the time of steering caused by the fluctuation of the moment of inertia around the steering axis can be reduced.

[0130]

According to the present invention, the rim-mounted tire 2
The secondary mass imbalance can be corrected, the outside diameter of the tire can be made uniform, and the fluctuation of the gyro effect at the time of steering caused by the fluctuation of the moment of inertia around the steering axis can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a tire balance adjusting device according to an embodiment of the present invention.

FIG. 2 is a block diagram of a tire balance adjusting device according to one embodiment of the present invention.

FIG. 3 is a flowchart showing an outline of a tire balance adjustment method according to an embodiment of the present invention.

FIG. 4 is a diagram showing a primary unbalance mass and a primary unbalance phase.

FIG. 5 is a diagram showing weight amounts and phases of primary correction weights, and primary and secondary unbalance masses.

FIG. 6 is a diagram showing a balanced state of a secondary mass imbalance.

FIG. 7 is a schematic diagram of a measuring device for measuring a moment of inertia.

FIG. 8 is a cross-sectional view of the rim-mounted tire with a correction weight attached.

FIG. 9 is a partial perspective view of a rim-mounted tire that has been balanced by a conventional mass unbalance adjustment method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Tire balance adjustment device 20 Rim mounting tire 26 Correction weight 32 CPU (calculation means)

Claims (3)

[Claims] 1. A tire balance adjusting device for adjusting a mass unbalance of a rim-assembled tire, wherein the tire balance adjusting device adjusts a mass around a rotation axis of the tire based on torque generated around at least two or more axes perpendicular to the tire rotation axis. First calculating means for calculating a primary unbalance mass at which the mass distribution of the rim-assembled tire becomes non-uniform and a primary unbalance position at which the mass distribution becomes non-uniform; at least three or more axes orthogonal to the tire rotation axis; Based on the moment of inertia generated around the axis and the calculation result by the first calculation means, the secondary unbalanced mass and the non-uniform mass distribution of the rim-mounted tire around the rotation axis of the tire become uneven. The secondary unbalance position is calculated, and the secondary mass unbalance is calculated based on the secondary unbalance mass, the secondary unbalance position, and the calculation result by the first calculation unit. Tire balancing device for a second calculating means for calculating a weight amount and the mounting position correction weights for adjusting the lance, in that it is configured to include a said. 2. A tire unbalance measuring method for measuring a mass unbalance generated in a rim-assembled tire and its position, wherein a torque generated around at least two or more axes orthogonal to a tire rotation axis is measured. Then, a first calculation for calculating a primary unbalance mass at which the mass distribution of the rim-mounted tire becomes non-uniform and a primary unbalance position at which the mass distribution becomes non-uniform around the rotation axis of the tire based on the measurement result. Measuring a moment of inertia generated around at least three axes orthogonal to the tire rotation axis, and assembling the rim around the rotation axis of the tire based on the measurement result and the calculation result in the first calculation step. Uneven mass distribution of tire 2
A second calculating step of calculating a secondary unbalance mass and a secondary unbalance position at which the mass distribution becomes non-uniform. 3. A tire balance adjusting method for adjusting a mass imbalance of a rim-assembled tire, comprising: measuring a torque generated around at least two or more axes orthogonal to a tire rotation axis; A first calculation step of calculating the primary unbalance mass at which the mass distribution of the rim-assembled tire becomes non-uniform and the primary unbalance position at which the mass distribution becomes non-uniform around the rotation axis of the tire; A moment of inertia generated around at least three orthogonal axes or more is measured, and based on the measurement result and the calculation result obtained by the first calculation step, the mass distribution of the rim-mounted tire around the rotation axis of the tire is determined to be non-uniform. Become 2
The secondary unbalance mass and the secondary unbalance position at which the mass distribution becomes non-uniform are calculated, and the secondary mass unbalance is calculated based on the secondary unbalance mass and the secondary unbalance position and the calculation result in the first calculation step. A second calculating step of calculating a weight amount and a mounting position of the correction weight to be adjusted, and a tire balance adjusting method.