JP2000221096A - Balancing machine and balancing test method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately measure rotating dynamic unbalance for a short time. SOLUTION: This balancing machine measures dynamic unbalance of a tire 1 by rotating a tire 1 turnably supported and detecting unbalance force of the rotating tire l with force detectors 8a, 8b. The balancing machine has a reference angle detector 10 and an encoder 13 for measuring an angular velocity and a rotation position of the rotating tire 1, and a dynamic unbalance calculation means for calculating the dynamic unbalance of the tire 1 according to the unbalance force detected by the force detectors 8a, 8b, and the angular velocity and the rotation position of the tire 1 measured by the reference angle detector 10 and the encoder 13 when the unbalance force detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a balance tester and a balance test method for measuring unbalance or dynamic unbalance of a rotating body such as a tire.

[0002]

2. Description of the Related Art A conventional automobile tire balancing tester will be described with reference to FIG. 1 shown in the figure is a tire. The tire 1 is attached to an upper end of a rotating shaft 3 rotatably provided inside a main body 2. Motor 4 can be rotated by the drive pulley 5, the drive transmission belt 6, a substantially constant that defines the tire 1 in advance through the driven pulley 7, and the rotary shaft 3 angular speed omega _T. Then, the tire 1 is rotated at a predetermined angular velocity omega _T by the motor 4, unbalanced force (F _A, F _B) in a predetermined direction orthogonal to the rotation axis 3 which occurs when the two respective force detector (e.g., load cell) 8a, and detects by 8b, a reference angle position of the origin of the rotational position of the tire 1 is detected by the reference angle detector 10, the unbalanced force (F _a, F _B)
The arithmetic control unit 9 performs various calculations using the reference position detection signal and the reference position detection signal, whereby the dynamic imbalance (U ₁ , U ₂ ) on the upper surface side and the lower surface side of the tire 1 can be obtained. That is, the magnitude of each unbalance based on the eccentricity of the center of gravity on the upper surface side and the eccentricity of the center of gravity on the lower surface side, and the angle (phase) from a predetermined reference position of the tire 1 to each center of gravity can be obtained. Therefore, it is possible to correct the respective centers of gravity on the upper surface side and the lower surface side of the tire 1 as necessary.

Next, the principle for determining the unbalance between the upper surface and the lower surface of the tire 1 will be described. FIG. 3 shows that a rigid rotor (tire 1) 11 having a dynamic imbalance (U ₁ , U ₂ ) has mechanical impedances Z _A , Z at two bearings A, B.
_The state supported by the gantry 12 through _B is shown. now,
The relationship between the unbalanced forces P _A and P _B applied to the bearings A and B when the rigid rotor 11 is rotating about the z-axis at the angular velocity ω is: P _A + P _B = ω ² (U ₁ + U ₂ ) (1a) hP _B = ω ² (z ₁ U ₁ + z ₂ U ₂ ) (1b) Assuming that vibration displacements (X _A , X _B ) are generated in the bearings A and B in a steady state, the respective bearings A,
The forces R _A and R _B acting on _B (this is also the force transmitted to the gantry 12) are: R _A = Z _A · X _A (2a) R _B = Z _B · X _B (2b) Here, (X _A , X _B ) is a vibration displacement in the x-axis direction, but since it has a phase, it is represented by a complex number and represented as a rotation vector. If the movement of the rotor 11 is limited to the xz plane in FIG. 3, the rotor 1 with respect to the unbalance (U ₁ , U ₂ )
1 of Transient Response (X _A, X _B) is given by the following equation.

[0004]

(Equation 1)

However, the rotating vector (U ₁ , U ₂ )
Here, only the x-component is considered, but in correspondence with the fact that the quantity has a phase and that (X _A , X _B ) is represented by a complex number, here (U ₁ , U ₂ ) is a complex number. Represents. Then, in FIG. 3, h is distance of the bearing A and bearing B, U ₁ is disproportionately motion of the rotor 11 at the position on the z-axis away the distance from the bearing A of z _1, U ₂ is z ₂ from the bearing A , C is the position of the center of gravity of the rotor 11 at a position on the z-axis away from the bearing A by c, M is the mass of the rotor 11, Is the rotor 11 about an axis parallel to the y-axis passing through C
Is the moment of inertia.

The solution (X _A , X _B ) of equation (3) is given by X _A = α ₁ U ₁ + α ₂ U ₂ (4a) X _B = β ₁ U ₁ + β ₂ U ₂ (4b) The forces R _A and R _B transmitted to are given by Equation (2a),
From (2b), R _A = Z _A · X _A = α ₁ 'U ₁ + α ₂ ' U ₂ (5a) R _B = Z _B · X _B = β ₁ 'U ₁ + β ₂ ' U ₂ (5b) Can be represented. α _i , β _i , α _i ′, β _i ′ (i
= 1, 2) are a kind of influence coefficient and also a function of ω. In the state of the hard bearing, X _A ≒ X _B ≒ 0, R _A ≒
P _A , R _B ≒ P _B , the bearings A, B hardly vibrate, and the unbalanced forces P _A , P _B are transmitted to the gantry 12 as they are. This is the state of the hard bearing, and the following equation holds. P _A = α ₁ 'U ₁ + α ₂ ' U ₂ (6a) P _B = β ₁ 'U ₁ + β ₂ ' U ₂ (6b) where α ₁ '= ω ² {1- (z ₁ / h)} , Α ₂ ′ = ω ² {1− (z ₂ / h)} β ₁ ′ = ω ² z ₁ / h, β ₂ ′ = ω ² z ₂ / h (7) Therefore, in the force detectors 8a and 8b, The detected unbalance force (F
_A, F _B) rotation vector imbalance forces and calculates the like (P _A, obtains the P _B), by substituting this (P _A, following equation P _B) (8), the dynamic imbalance (U ₁ ,
U ₂ ).

[0007]

(Equation 2)

[0008] Therefore, according to the conventional balancing machine shown in FIG. 4, by rotating the tire 1 at a predetermined angular velocity omega _T by the motor 4, imbalance in the x-axis direction orthogonal to the rotation axis 3 generated when the force (F _a, F _B) rotation vector unbalanced force by calculating using (P _a, P _B)
Can be requested. However, each of the two force detectors 8
a, the 8b can be detected is the unbalanced force in the x-axis direction (F _A, F _B), its magnitude, unbalanced force of the rotation vector (P _A, P _B) x-axis of Directional component. Calculation control unit 9, unbalanced force (F _A, F _B) rotation vector unbalanced force from (P _A, P _B) in order to calculate the analyzes by FFT (fast Fourier transform). The reference angle position of the rotation vector (P _A , P _B ) is determined by a detection signal detected by the reference angle detector 10. Then, the dynamic imbalance (U ₁ , U ₂ ) is calculated by substituting the rotation vector (P _A , P _B ), the predetermined angular velocity ω _T , and h, z ₁ , z ₂ into the equation (8) and the like. be able to.

[0009]

However, according to FIG.
According to the arithmetic and control unit 9 of the conventional balancing test machine, the unbalance force
(F_A, F_B) Is unbalanced by FFT analysis
Force rotation vector (P_A, P_B) To calculate
A constant angular velocity ω of the tire 1 by the motor 4_TRotate with
Unbalance force during the time zone (F_A, F_BMust measure)
It is necessary. Therefore, the rotation speed of the tire 1 is equal to the predetermined angular speed.
ω_TThe time period of acceleration until
In the time period of deceleration until stopping, the rotation vector
(P_A, P _B) To calculate the unbalance force (F_A, F
_B) Cannot be measured, which results in a rotation vector
Torr (P_A, P_B) Test time to get tire 1
The problem is that it takes longer for the acceleration time and the deceleration time.
You. Then, the tire 1 is rotated at a constant angular velocity ω_TRotate with
It is necessary, but the rotation speed actually fluctuates,
The variation of the rotation speed is the rotation vector (P_A, P_B)of
Will be included as an error, resulting in dynamic imbalance
(U₁, U_Two) Of measurement accuracy
You.

The present invention provides a balance tester and a balance test method capable of measuring unbalance or dynamic unbalance of a rotating object to be measured, such as a tire, in a shorter time and with higher accuracy than before. The purpose is to:

[0011]

According to a first aspect of the present invention, an unbalanced force when rotating an object to be measured rotatably supported is detected by force detecting means, and the unbalanced movement of the object to be measured is detected. In a balancing tester for measuring balance, a speed and rotation position measuring means for measuring an angular velocity and a rotation position of the rotating object to be measured, an unbalance force detected by the force detection means, and the unbalance force Motion unbalance calculation means for calculating the motion unbalance of the object using the angular velocity and the rotational position of the object measured by the speed and rotation position measuring means when is detected. It is characterized by the following.

According to a second aspect of the present invention, there is provided a balancing test for detecting a dynamic unbalance of the object to be measured by detecting an unbalance force when the object to be rotatably supported is rotated by force detecting means. In the machine, speed and rotation position measuring means for measuring the angular velocity and the rotation position of the object to be rotated,
The unbalance force detected by the force detection unit, and the angular velocity and rotation position of the object to be measured measured by the speed and rotation position measurement unit when the unbalance force is detected, the force detection unit A rotation vector calculating means for calculating a rotation vector of the unbalance force of the object to be measured, and a dynamic unbalance for calculating the dynamic unbalance of the object to be measured using the rotation vector of the calculated unbalance force And a calculating means.

According to a third aspect of the present invention, there is provided a balancing test for detecting an unbalanced force when a measurement object, which is rotatably supported, is rotated by force detection means to measure the dynamic unbalance of the measurement object. Measuring the angular velocity and rotational position of the rotating object under test, and the unbalanced force detected by the force detecting means, and the unbalanced force of the object measured when the unbalanced force is detected. Calculating a rotation vector of the unbalanced force of the object to be measured applied to the force detecting means using the angular velocity and the rotational position; and using the calculated rotation vector of the unbalanced force to calculate the rotation vector of the object to be measured. Calculating a motion imbalance.

According to a fourth aspect of the present invention, there is provided a balancing test for detecting the unbalance force when the object to be measured rotatably supported is rotated by a force detecting means to measure the dynamic unbalance of the object to be measured. In the machine, speed and rotation position measuring means for measuring the angular velocity and the rotation position of the object to be rotated,
A time series value calculating means for calculating a time series value based on the angular velocity and the rotational position measured at the same time or substantially the same time; and the force detecting means at a time corresponding to the time series value and the time series value Parameter calculating means for calculating a parameter based on the unbalance force detected by, and dynamic unbalance calculating means for calculating the dynamic unbalance of the measured object using the parameter, Is what you do.

According to a fifth aspect of the present invention, there is provided a balancing tester for measuring an unbalance of an object to be measured by detecting an unbalance force when the object to be rotatably supported is rotated by a force detecting means. In, the velocity measuring means for measuring the angular velocity of the rotating object to be measured, the unbalanced force detected by the force detecting means, and the angular velocity of the object to be measured when the unbalanced force is detected And an unbalance calculating means for calculating the unbalance of the object to be measured which does not include an element of the angular velocity.

According to the first aspect of the present invention, the unbalance force sequentially detected by the force detection means, and the angular velocity and the rotational position of the measured object measured at each time when the unbalance force is detected, are used. The dynamic imbalance calculating means can calculate the dynamic imbalance of the measured object. According to the second and third inventions, the unbalance force sequentially detected by the force detection means,
Using the angular velocity and the rotational position of the rotating object to be measured measured at each time when the unbalanced force is detected, a rotation vector of the unbalanced force of the object to be measured applied to the force detecting means is calculated. The dynamic unbalance of the measured object can be calculated using the rotation vector of the unbalance force.

According to the fourth invention, the time series value calculating means calculates the time series value based on the angular velocity and the rotational position measured at the same time or substantially the same time, and each time series value and each of these time series values are calculated. The parameter calculating means calculates a parameter based on the unbalance force detected by the force detecting means at a time corresponding to the time, and the dynamic unbalance calculating means calculates the dynamic unbalance of the measured object using the parameter. Can be. According to the fifth aspect, the unbalanced force detected by the force detecting means and the angular velocity of the measured object when the unbalanced force is detected are used to determine the unbalanced of the measured object that does not include the element of the angular velocity. The balance can be calculated.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The balance test method according to the present invention is used.
1 to 3 show an embodiment of a balance testing machine to be used.
I will explain. FIG. 1 shows a balancing test according to this embodiment.
It is a front view of a machine. This balance testing machine is a cantilever type
It is a test machine, with tire 1 mounted and rotated,
Unbalance U on the upper surface side of the tire 1₁And the lower surface side
Match U _TwoThat is, based on the eccentricity of each center of gravity on the upper and lower sides,
Can be obtained. And this measurement
Of the upper and lower sides of the tire 1 obtained by measurement
Match (U₁, U_Two), If necessary, tire 1
Correction of the dynamic imbalance of
Can keep the dynamic imbalance of tire 1 within the allowable range
You. In addition, the dynamic imbalance of the tire 1 is described in a conventional example.
As shown, the rotating vector (U₁, U_Two)
You. That is, the rotating vector U₁And U _TwoCan be measured
Then | U₁| And | U_Two|, That is, tire 1
Eccentric mass m on the upper and lower sides of₁And m_TwoAnd these biased
Heart mass m₁, M_TwoCenter of rotation of the tire 1 at each center of gravity
Distance r to the z-axis (see FIG. 3)₁, R_TwoWith product m
₁r₁, M _Twor_TwoAnd the eccentric mass
m₁, M_TwoFrom a predetermined reference position of the tire 1 at each center of gravity
Phase ψ₁, Ψ_TwoCan be obtained. This balance testing machine
According to the conventional method, the tire 1 is fixed like a conventional balancing tester.
Angular velocity ω_TNo need to rotate the tire, the rotation speed of the tire 1
Time during acceleration, and rotation of tire 1 stops
Unbalance obtained by measuring during the time of deceleration until
Power F_A, F_B, Angular velocity ω, and rotational position (predetermined reference
Using the rotation angle θ) θ of the tire 1 from the angular position
Unbalance of motion of ya 1 (U₁, U_Two) Can be calculated
You. As a result, the dynamic imbalance (U₁,
U_Two) Requires less test time than before
can do.

As shown in FIG.
The main body 2 is suspended from the gantry 12 via, for example, a torsion bar so as to be perpendicular to the horizontal plane. And
The main body 2 is provided so as to be movable only in a direction (x-axis direction shown in FIG. 3) orthogonal to the paper surface of FIG. As shown in FIG. 1, a total of two force detectors 8a and 8b such as load cells are provided at upper and lower positions on the side surface of the main body 2, respectively. 8
b and is connected to the gantry 12. As a result, the force detectors 8a and 8b act on the main body 2 in an unbalanced force F in the x-axis direction orthogonal to the plane of FIG.
_A, it is possible to detect the F _B.

A rotating shaft 3 is provided inside the main body 2 so as to be rotatable in a vertical direction, and the tire 1 is detachably attached to an upper end of the rotating shaft 3.
Motor 4 can be rotated by the drive pulley 5, the drive transmission belt 6, a substantially constant that defines the tire 1 in advance through the driven pulley 7, and the rotary shaft 3 angular speed omega _T. As shown in FIG. 1, the rotating shaft 3 has a reference angle detector 10 for detecting a reference angle position as an origin of the rotation position of the tire 1, and a rotary shaft for detecting the rotation angle of the tire 1. And an encoder 13. The reference angle detector 10 and the rotary encoder 13 are for sequentially measuring an angular velocity ω of the tire 1 and a rotation angle θ (rotation position θ) of the tire 1 from a predetermined reference angle position. Calculation and control unit 14
Can be output sequentially. Although not shown in the drawing, the arithmetic control unit 14 is connected to a storage unit in which a predetermined program is stored, and performs various arithmetic operations and controls according to the program. , A time series value calculating unit, a parameter calculating unit, a rotation vector calculating unit, and a motion imbalance calculating unit.

The speed calculating means and the rotational position calculating means are:
Reference angle position detection signal and rotation input sequentially every predetermined time
Angular velocity ω and rotation position of tire 1 based on the angle detection signal
This is a means for sequentially calculating θ. The time series value calculation means
Based on the angular velocity ω and the rotational position θ measured at the time,
Equations (13a) and (13b) are calculated to obtain the time-series value v₁,
v_TwoIs a means for calculating The parameter calculation means
Series value v₁, V_TwoAnd at time t corresponding to this time series value
Detected by the force detectors 8a and 8b, respectively.
Balancing force F_A, F_B(15a), (15
b) From parameter α_i”, Β_i"(I = 1,2)
It is a means to issue. The rotation vector calculation means calculates the angular velocity ω
And the parameter α_i”, Β_i”Using the expression (16
a), (16b), (18a), force detection from (18b)
Vector of the unbalanced force of the tire 1 applied to the devices 8a and 8b
Torr (P_A, P_B) Is calculated. Motion imbalance
The calculating means determines whether or not the tire 1 is applied to the force detectors 8a and 8b.
Rotation vector of balance force (P_A, P_B) To equation (8)
Substituting for the dynamic imbalance of tire 1 (U ₁, U_Two)
Means.

Next, the balancing tester constructed as described above was calculated based on the reference angle position detection signal and the rotation angle detection signal obtained by measuring with the reference angle detector 10 and the rotary encoder 13. angular velocity ω and the rotational position θ of the tire 1, and the force detector 8a, using unbalanced force detected by 8b and (F _a, F _B), calculates the dynamic unbalance U _1, U ₂ tire 1 Explain what can be done using mathematical formulas. First, the outputs (F _A , F _B ) of the force detectors 8a and 8b, that is, the rotation vectors (P
_A, is a projection of the x-axis of the _{P B) (F A, F} B) _{includes, F A = | P A |} cos (θ + φ A) (10a) F B = | P B | cos (θ + φ B) (10b ) It can be expressed as. However, theta is angle of rotation of the tire 1 from a predetermined reference angle _{position, | P A |, | P} B | and phi _A,
φ _B is the gain and phase of the rotation vector (P _A , P _B ), respectively.

Here, from equation (6a), P _A is given by: P _A = ω ² [{1- (z ₁ / h)} U ₁ + {1- (z ₂ / h)} U ₂ ] (11a) It can be expressed as. By substituting this P _A into equation (10a), F _A = | P _A | cos (θ + φ _A ) = | P _A | cos (θ) cos (φ _A ) − | P _A | sin (θ) sin (φ _A) = _ω ² | _{[{1- (z 1 / h)} } U 1 + {1- (z 2 / h)} U 2 ] | co s (θ) cos ( φ A) -ω 2 | [{ 1- (z ₁ / h)｝ U ₁ + {1- (z ₂ / h)｝ U ₂ ] | sin (θ) sin (φ _A ) (12a) In the equation (12a), v ₁ = ω ² cos (θ) (13a) v ₂ = −ω ² sin (θ) (13b)

Α ₁ ″ = | [{1- (z ₁ / h)｝ U ₁ + {1- (z ₂ / h)｝ U ₂ ] | cos (φ _A ) (14a) α ₂ ″ = | [ {1- (z ₁ / h)} U ₁ + {1- (z ₂ / h)} U ₂ ] | sin (φ _A ) (14b). v ₁ and v ₂ are the angular velocity ω and the rotational position θ of the tire 1
Is a time-series value consisting of The time series values v ₁ and v ₂ are calculated by the time series value calculation means. Thus, F _A = α ₁ ″ v ₁ + α ₂ ″ v ₂ (15a). The parameters α ₁ ″ and α ₂ ″ in the equations (14a) and (14b) can be estimated using, for example, the least squares method, or can be calculated by solving simultaneous equations. This parameter α ₁ ”, α
₂ ″ are time series values v ₁ , v ₂ and time series values v ₁ , v ₂
Based on the detected imbalance force F _A by the force detector 8a at the corresponding time and can be calculated parameter calculating means.

From the parameters α ₁ ″, α ₂ ″ and equation (11a), the rotation vectors | P _A |, φ _A of the unbalanced force of the tire 1 applied to the force detector 8a can be obtained. | P _A | = ω ² (α ₁ ″ ² + α ₂ ″ ² ) ^1/2 = ω ² | [{1- (z ₁ / h)｝ U ₁ + {1- (z ₂ / h)} U ₂ | (16a) φ _A = tan ⁻¹ (α ₂ ″ / α ₁ ″) (16b) The rotation vector calculating means calculates the rotation vector | P _A |, φ _A of this unbalanced force.

Next, in the same manner as in the equation (11a), the equation (6)
From b), P _B can be expressed as P _B = ω ² {(z ₁ / h) U ₁ + (z ₂ / h) U ₂ } (11b). Substituting this P _B in the formula _{(10b), F B = |} P B | cos (θ + φ B) = | P B | cos (θ) cos (φ B) - | P B | sin (θ) sin (φ ^{_{B) = ω 2 | {(}} z 1 / h) U 1 + (z 2 / h) U 2} | cos (θ) cos (φ B) -ω 2 | {(z 1 / h) U 1 + ( z ₂ / h) U ₂ ｝ | sin (θ) sin (φ _B ) (12b) Here, β ₁ ″ = | ｛(z ₁ / h) U ₁ + (z ₂ / h) U ₂ ｝ | cos (φ _B ) (17a) β ₂ ″ = | ｛(z ₁ / h) U ₁ + (Z ₂ / h) U ₂ ｝ | sin (φ _B ) (17b).

The time series values v _1, v ₂ and β ₁ ", β _{2" by, F B = β 1 "v} 1 + β 2" v can be expressed as ₂ (15b). The parameters β ₁ ″ and β ₂ ″ of the equations (17a) and (17b) can be estimated using, for example, the least square method. This parameter β ₁ ”,
β ₂ ″ is the time series values v ₁ , v ₂ and the time series values v ₁ , v
Can be the parameter calculating means is calculated based on the ₂ and the corresponding unbalanced force detected by the force detector 8b at the time of F _B. Then, the parameters β ₁ ″, β
₂ ”and equation (11b), the rotation vector | P _B |, φ _B of the unbalanced force of the tire 1 applied to the force detector 8b can be obtained. | P _B | = ω ² (β ₁ ″ ² + Β ₂ ″ ² ) ^1/2 = ω ² | ｛(z ₁ / h) U ₁ + (z ₂ / h) U ₂ ｝ | (18a) φ _B = tan ⁻¹ (β ₂ ″ / β ₁ ″) (18b) The rotation vector calculating means calculates the rotation vector | P _B |, φ _B of the unbalanced force.

Thereafter, the equations (16a), (16b),
Force detectors 8a and 8b represented by (18a) and (18b)
Rotation vector of the unbalanced force of the tire 1 (P _A ,
By substituting P _B ) into equation (8), the dynamic imbalance (U ₁ , U ₂ ) of the tire 1 can be calculated. It is the dynamic imbalance calculating means that calculates the dynamic imbalance (U ₁ , U ₂ ) of the tire 1.

Next, the arithmetic and control unit 14 stores in advance in the storage unit.
Movement of the tire 1 according to the prescribed program
Match U₁, U_TwoThe flow chart showing the procedure for calculating
The explanation will be made with reference to the chart. Where a, b,
Constants such as c and d are set in advance. First, the motor 4
The tire is driven to rotate in a predetermined direction. At this time
And the unbalanced force F detected by the force detectors 8a and 8b.
_A, F_BAre sequentially input, and the reference angle detector 10 and the
Reference angle position input sequentially from the rotary encoder 13
Speed calculation means based on the output signal and the rotation angle detection signal.
The shift position calculating means sequentially calculates the angular velocity ω and the rotational position θ of the tire 1.
Next calculation is performed (S100). Then, the time series value calculating means
Equations (13a) and (13b) are calculated and the time series value v₁, V
_TwoIs calculated (S102), and the parameter calculating means calculates the equation (1).
4a), (14b), (17a), and (17b)
Parameter α_i”, Β_i"(I = 1, 2)
(S104). Next, the rotation vector calculating means determines that the tire 1
Angular velocity ω and parameter α_i”, Β _iPower test using
Of the unbalanced force of the tire 1 applied to the output devices 8a and 8b.
Kutor (P_A, P_B) Is calculated (S106), and
The tie that the dynamic imbalance calculation means applies to the force detectors 8a and 8b
Rotation vector P of unbalance force of yam 1_A, P_Busing
Dynamic imbalance U of tire 1₁, U_TwoIs calculated (S10
8). As a result, the eccentricity of the center of gravity on the upper surface side of the tire 1
Of each unbalance based on the eccentricity of the center of gravity of the lower and lower sides | U
₁|, | U_TwoAnd each weight from a predetermined reference position of the tire 1
Angle to heart (phase ψ₁, Ψ_Two) Can ask
You. Therefore, if necessary, the upper surface side and the lower surface side of the tire 1
Of each center of gravity can be corrected.

According to the balancing tester, the angular velocity ω, which is the rotational speed of the tire 1, is fluctuating, that is, the time period during which the rotational speed is being accelerated, or the time until the tire 1 stops rotating. Unbalance forces F _A , F _B , angular velocity ω, and rotational position θ obtained during the deceleration time zone
Can be used to calculate the dynamic unbalance U ₁ , U ₂ of the tire 1, so that the test time required to calculate the dynamic unbalance U ₁ , U ₂ of the tire 1 can be made shorter than before. it can. Then, U _1, in order to calculate the U _2, it is not necessary to hold the angular velocity omega of the tire 1 to be constant, no error is generated based on the variation of the angular velocity omega, U ₁ than conventional correspondingly, U ₂ can be measured with high accuracy.

In the above embodiment, the encoder 13 is provided to measure the angular velocity ω and the rotational position θ of the tire 1. However, a servo motor is used as the motor 4 for rotating the tire 1. In this case, the encoder 13 may be omitted, and the angular velocity ω and the rotational position θ of the tire 1 may be measured using information obtained from the encoder mounted on the servomotor.

[0032] Then, in the above embodiment, the calculation control unit 14 is a force detector 8a, unbalanced force F _A has been detected by 8b, the maximum value of _{F B | P A |, |} P B |, and Substituting the angular velocity ω of the tire 1 at the time when the unbalance forces | P _A | and | P _B | are measured into Expression (8), the unbalance | U ₁ | | U ₂ | may be calculated. With this configuration, | U ₁ |, | U ₂ | is first determined by a balance tester to determine whether | U ₁ |, | U ₂ | is within a predetermined allowable range. , | U ₁ |, | U ₂ | are within the predetermined allowable range, data for obtaining the angular phases ψ ₁ , ψ ₂ from the predetermined reference position of the tire 1 to each center of gravity is obtained. Therefore, it is possible to shorten the balance test time as a whole.

[0033]

According to the first to fourth aspects of the present invention, the unbalance force sequentially detected by the force detection means, and the angular velocity and rotation of the object measured at each time when the unbalance force is detected. In this configuration, the position is used to calculate the dynamic imbalance of the measured object. Therefore, there is no need to rotate the DUT at a constant angular velocity as in a conventional balance tester, and the time period during which the rotation speed of the DUT is accelerated, and the speed is reduced to stop the rotation of the DUT The dynamic unbalance of the measured object can be calculated using the unbalance force, the angular velocity, and the rotational position obtained during the measurement in the time period. As a result, there is an effect that the test time required for calculating the dynamic imbalance of the measured object can be made shorter than before. According to these inventions, the measurement accuracy of the dynamic imbalance does not decrease due to the fluctuation of the rotation speed of the object to be measured, and therefore, the measurement accuracy of the dynamic imbalance based on the fluctuation of the rotation speed is prevented from lowering. can do.

According to the fifth aspect of the present invention, the unbalanced force detected by the force detecting means and the angular velocity of the measured object when the unbalanced force is detected are used to measure the measured object without the element of the angular velocity. This is a configuration for calculating the unbalance of an object. Therefore, there is no need to rotate the DUT at a constant angular velocity,
Measurement is performed using the unbalance force and angular velocity obtained by measuring the time period during which the rotation speed of the device under test is accelerating and the time period during which the device under test is decelerating to stop rotation. It is possible to calculate the unbalance of an object. by this,
This has the effect that the test time required to calculate the unbalance of the measured object can be made shorter than before. Then, the measurement accuracy of the unbalance does not decrease due to the fluctuation of the rotation speed of the object to be measured. Therefore, it is possible to prevent the measurement accuracy of the unbalance due to the fluctuation of the rotation speed from decreasing.

[Brief description of the drawings]

FIG. 1 is a front view of a balancing tester according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a procedure of a calculation process by the balance tester according to the embodiment.

FIG. 3 is a diagram for explaining the principle of the balance tester according to the embodiment.

FIG. 4 is a front view of a conventional balancing tester.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tire 2 Main body 3 Rotating shaft 4 Motor 8a, 8b Force detector 9 Operation control unit 10 Reference angle detector 13 Rotary encoder

Claims (5)

[Claims] 1. A balancing tester for detecting a dynamic unbalance of an object to be measured by detecting an unbalance force when the object to be rotatably supported is rotated by a force detecting means. Speed and rotation position measurement means for measuring the angular velocity and rotation position of the object to be measured, the unbalance force detected by the force detection means, and the speed and rotation position when the unbalance force is detected. A dynamic unbalance calculating means for calculating a dynamic imbalance of the object using the angular velocity and the rotational position of the object measured by the measuring means. 2. A balancing tester for detecting a dynamic unbalance of an object to be measured by detecting an unbalance force when the object to be rotatably supported is rotated by a force detecting means. Speed and rotation position measurement means for measuring the angular velocity and rotation position of the object to be measured, the unbalance force detected by the force detection means, and the speed and rotation position when the unbalance force is detected. Rotation vector calculation means for calculating a rotation vector of the unbalanced force of the object to be measured applied to the force detection means using the angular velocity and the rotational position of the object to be measured measured by the measurement means; and A dynamic imbalance calculating means for calculating the dynamic imbalance of the object to be measured using a rotation vector of the balancing force. 3. A balance test method for detecting a dynamic imbalance of an object to be measured by detecting an unbalance force when the object to be rotatably supported is rotated by force detection means. Measuring the angular velocity and the rotational position of the object to be measured, and the unbalanced force detected by the force detecting means,
Calculating a rotational vector of the unbalanced force of the object to be measured applied to the force detecting means using the angular velocity and the rotational position of the object measured when the unbalanced force is detected; and Calculating a dynamic unbalance of the object to be measured using the rotation vector of the calculated unbalance force. 4. A balancing tester for detecting a dynamic unbalance of an object to be measured by detecting an unbalance force when rotating an object to be rotatably supported by a force detecting means. Speed and rotation position measuring means for measuring the angular velocity and the rotation position of the object to be measured, and a time series for calculating a time series value based on the angular velocity and the rotation position measured at the same time or substantially the same time Value calculating means, parameter calculating means for calculating a parameter based on the time series value and the unbalance force detected by the force detecting means at a time corresponding to the time series value, and A dynamic imbalance calculating means for calculating a dynamic imbalance of the measured object. 5. A balance testing machine for measuring an unbalance of an object to be measured by detecting an unbalance force when the object to be rotatably supported is rotated by a force detecting means. Using a velocity measuring means for measuring the angular velocity of the object to be measured, the unbalanced force detected by the force detecting means, and the angular velocity of the object to be measured when the unbalanced force is detected, And a means for calculating an unbalance of the object to be measured which does not include an element of angular velocity.