JPH07190876A - Rotating body balance measuring device - Google Patents

Abstract

(57) [Summary] [Purpose] To accurately measure imbalance. [Structure] A rotation detecting means 1 for detecting a rotation state of a tire attached to a vehicle body is provided, and a vibration detecting means 2 for detecting a vibration state when the tire is rotated is provided. A frequency analysis means 3 for frequency-analyzing the detection signal of the detection means 2 is provided, a rotation primary calculation means 4 for obtaining a rotation primary frequency from the output signal of the frequency analysis means 3 is provided, and rotation and vibration at the rotation primary frequency The phase difference calculating means 5 for obtaining the phase difference of the rotation frequency analyzing means 3 is provided.
A fluctuation peak detecting means 6 for detecting a fluctuation peak of the vibration power spectrum value at the primary rotation frequency from the output signal of the above, and a peak cycle detecting means 7 for detecting a peak cycle of the fluctuation of the vibration power spectrum value, An unbalance calculation means 8 is provided for calculating the unbalance amount and the unbalance phase according to the peak cycle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor balance measuring device for measuring an unbalance amount and an unbalance phase of a rotor such as a tire.

[0002]

2. Description of the Related Art If a tire is unbalanced, steering shimmy and vehicle body vibration may occur. For this reason, recently, as disclosed in Japanese Patent Laid-Open No. 63-266331, an unbalance vector (unbalance amount,
The unbalance phase is measured, and a correction weight capable of correcting the unbalance is attached to the tire.

In a conventional tire balance measuring device, a dummy weight having a predetermined weight is added at a position where the phase of the tire is 0 °, and the rotation detecting means is used in a state where the tire is rotated at a rotation speed at which the vehicle speed becomes a predetermined speed. The rotation state of the tire is detected, the vibration state of the tire is detected by the vibration detecting means, and the vibration power spectrum value at the rotation primary frequency and the phase difference between the rotation and the vibration are obtained from the detected values, and the vibration power spectrum is obtained. Value, the phase difference between rotation and vibration, the unbalance vector V ₀ is obtained, and then the tire phase is 18
A dummy weight having a predetermined weight is added to the position of 0 °, the unbalance vector V ₁₈₀ is calculated in the same manner, and the current tire unbalance vector V _I is _calculated from the unbalance vectors V ₀ and V ₁₈₀ .

[0004]

However, in such a tire balance measuring device, the S / N ratio of the vibration signal when the amount of unbalance is large or due to unbalance is present.
When the ratio is measured well and stably, as shown in FIG. 12, the vibration power spectrum value at the primary rotation frequency, the fluctuation cycle of the phase difference between rotation and vibration are long and constant, and the phase difference is constant. However, when the unbalance amount is small or when the signal of the vibration due to the imbalance is measured in an unstable and poor S / N ratio, the vibration level is small, so Since the influence of sensitivity and other vibrations of the vehicle will increase, S / N
Since the ratio is poor, as shown in FIG. 13, the vibration power spectrum value at the primary rotation frequency, the fluctuation period of the phase difference between rotation and vibration are not short and constant, and the phase difference varies greatly. Therefore, when the vector amount of the vector of the sum of the current unbalance vector V _{I of} the tire and the unbalance vectors V ₀ and V ₁₈₀ becomes small, for example, the current unbalance amount is 20 g and the phase is 0 °. , The dummy weight of 20 g has a phase of 1
When it is added to the position of 80 °, the unbalance amount at the time of measurement becomes small, so that the vibration power spectrum value at the primary rotation frequency and the phase difference between rotation and vibration cannot be accurately obtained. It cannot be measured accurately.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a rotating body balance measuring device capable of accurately measuring an imbalance.

[0006]

To achieve this object, according to the present invention, there are provided a rotation detecting means for detecting a rotation state of a rotating body and outputting a rotation detection signal, and a rotation detecting means for rotating the rotating body. Vibration detection means for detecting a vibration state and outputting a vibration detection signal, frequency analysis means for frequency-analyzing the vibration detection signal, and rotation primary calculation means for obtaining a rotation primary frequency from the output signal of the frequency analysis means. , Phase difference calculation means for obtaining a phase difference between the rotation detection signal and the vibration detection signal at the rotation primary frequency, and fluctuation of the vibration power spectrum value at the rotation primary frequency from the output signal of the frequency analysis means. Peak detecting means for detecting the peak of the peak, the peak cycle detecting means for detecting the cycle of the peak, the frequency analyzing means and the phase difference operation depending on the cycle of the peak. From the output signal of the means providing the unbalanced calculating means for calculating a unbalance amount and unbalance the phase of the rotating body.

In this case, the unbalance calculating means calculates the unbalance amount and the unbalance phase according to the relationship between the period of the peak when the weight is not added and the period of the peak when the weight is added. May be used.

In this case, as the imbalance calculating means, when the cycle of the peak when the weight is not added is smaller than the cycle of the peak when the weight is added, the frequency analyzing means and the phase difference calculating means when the weight is added. It is also possible to use one that calculates the above-mentioned unbalance amount and the above-mentioned unbalance phase from the output signal of.

Further, rotation detecting means for detecting a rotation state of the rotating body and outputting a rotation detection signal, and vibration detecting means for detecting a vibration state when the rotating body is rotated and outputting a vibration detection signal. Frequency analysis means for frequency-analyzing the vibration detection signal, rotation primary calculation means for obtaining a rotation primary frequency from an output signal of the frequency analysis means, and rotation 1
Phase difference calculation means for obtaining a phase difference between the rotation detection signal and the vibration detection signal at the next frequency, phase difference variation detection means for detecting variation in the phase difference from the output signal of the phase difference computation means, and There is provided an unbalance calculating means for calculating the unbalance amount and the unbalance phase of the rotating body from the output signals of the frequency analyzing means and the phase difference calculating means according to the variation of the phase difference.

In this case, as the phase difference variation detecting means, a means for calculating the standard deviation of the phase difference may be used.

[0011]

In this rotating body balance measuring device, the rotating body is unbalanced according to the peak value and the phase difference in the state where the peak period is stable, or the peak value and the phase difference in the state where the variation in the phase difference is small. Since the balance amount and the unbalance phase are calculated, it is possible to calculate the unbalance amount and the unbalance phase using the vibration detection value in a stable vibration state. Etc. will have less effect.

[0012]

1 is a block diagram showing a tire balance measuring apparatus according to the present invention. As shown in the figure, rotation detecting means 1 for detecting a rotation state of a tire mounted on a vehicle body and outputting a rotation detection signal is provided, and a vibration state when the tire is rotated is detected to output a vibration detection signal. The vibration detecting means 2 for outputting is provided, and the frequency analyzing means 3 for frequency-analyzing the rotation detecting signal of the rotation detecting means 1 and the vibration detecting signal of the vibration detecting means 2 is provided. Rotation primary calculation means 4 for determining the frequency is provided, and phase difference calculation means 5 for determining the phase difference between the rotation detection signal and the vibration detection signal at the rotation primary frequency is provided.
Fluctuation peak detection means 6 for detecting a fluctuation peak of the vibration power spectrum value at the primary rotational frequency from the output signal of the rotation frequency analysis means 3 is provided, and a peak cycle for detecting a cycle of fluctuation peaks of the vibration power spectrum value. The detecting means 7 is provided, and the unbalance calculating means 8 for calculating the unbalance amount and the unbalance phase from the output signals of the rotation frequency analyzing means 3 and the phase difference calculating means 5 according to the peak cycle.

FIG. 2 is a perspective view showing a mechanical portion of the tire balance measuring device shown in FIG. 1, and FIG. 3 is a block diagram showing an analyzing device of the tire balance measuring device shown in FIG. As shown in the figure, a spindle 13 is connected to and supported by a strut 11 and a suspension lower arm 12, a hub 14 is attached to the spindle 13, a wheel 16 of a tire 15 is connected to the hub 14 by bolts and nuts, and a reflective tape is attached to the tire 15. 17, the optical fiber sensor 18 is arranged so as to face the reflection tape 17, and the optical fiber sensor amplifier 1 is attached to the optical fiber sensor 18.
9 is connected, the acceleration sensor 20 is attached to the spindle 13 by adhesion or the like, and the acceleration sensor 20 is connected to the amplifier 2
1 is connected, the reflection tape 17 and the optical fiber sensor 1
8. Rotation detecting means 1 by optical fiber sensor amplifier 19
The acceleration sensor 20 and the amplifier 21 constitute the vibration detecting means 2. Further, the optical fiber sensor amplifier 19 and the amplifier 21 are connected to the anti-aliasing filter 30, the anti-aliasing filter 30 is connected to the A / D converter 32 of the microcomputer 31, and the microcomputer 31 is remotely connected to the microcomputer 31 via the interface circuit 33. The switch 23 is connected, and the remote switch 23 is provided with a vehicle type information input device 24 for inputting vehicle type and specification information from a card inserted in a card reader, a start switch 25, a cancel switch 26, a reset switch 27, and a measurement end lamp 28. The microcomputer 31 includes a liquid crystal display 34 and a printer 35.
, The microcomputer 31 has a frequency analysis means 3, a rotation primary calculation means 4, a phase difference calculation means 5, a fluctuation peak detection means 6, a peak period detection means 7, and an unbalance calculation means 8. The programs shown in the flowcharts of FIGS. 4 to 6 are stored in the storage means (not shown) of the computer 31, and analyzed by the anti-aliasing filter 30, the microcomputer 31, the interface circuit 33, the liquid crystal display 34, the printer 35 and the like. The device body 13 is configured.

Next, the operation of the tire balance measuring device shown in FIGS. 1 to 3 will be described. First, tire 15
When the start switch 25 is turned on after the tire 15 is rotated at a rotation speed at which the vehicle speed is 110 km without adding dummy weights to the optical fiber sensor 18,
The acceleration sensor 20 detects the rotation state and vibration state of the left tire 1, and the A / D converter 32 performs A / D conversion on the signals of the optical fiber sensor 18 and the acceleration sensor 20 at a sampling speed of 8 msec, and the sampling number Ns A / D conversion is repeated until the value becomes 256, and the vibration digital data and the rotation digital data are stored in a predetermined address of the memory of the microcomputer 31 (steps S1 to S4). Next, the microcomputer 31 uses the vibration digital data,
Fast Fourier transform (FFT) processing is performed on the rotation digital data to obtain a vibration power spectrum and a rotation power spectrum, a rotation primary frequency f1 is calculated from the rotation power spectrum, and a vibration power spectrum value P at the rotation primary frequency f1 is obtained.
_LN is obtained, and the phase difference θ _LN between the two is obtained from the rotation power spectrum value and the vibration power spectrum value at the primary rotation frequency f1 (steps S5 to S8). Where the rotation,
Fourier analysis result of vibration Fx (ω), | Fx (ω) |, Fy
(ω), | Fy (ω) |, and the phase difference θ _LN are represented by the following equations.

Fx (ω) = a + jb | Fx (ω) | = √ (a ² + b ² ) Fy (ω) = c + jd | Fy (ω) | = √ (a ² + b ² ) θ _LN = tan ~ ¹ { (ad-bc) / (ac + bd)} Next, by comparing the vibration power spectrum value P _LN with the previous vibration power spectrum value P _LN , it is determined whether or not the vibration power spectrum value P _LN is the peak of the fluctuation. Detect
The vibration power spectrum value P _LN corresponding to the mountain portion and the phase difference θ _LN at that time are stored in the memory, and the cycle from the previous mountain portion, that is, the mountain period T _L is stored in the memory (steps S9 to S13). Next, the allowable range is β%
Then, the OK zone P _LZ is calculated by the following equation.

P _LZ = P _LAV ± (β / 100) P _LAV = (P _LN0 + P _LN1 + ... + P _LNNL ) / N _L And the number L of vibration power spectrum values P _LN of the mountain portion in the OK zone P _{LZ When L} is detected and the number L _L is equal to or smaller than the predetermined value γ (for example, 3 or 4), the above operation is repeated until the number L _L exceeds the predetermined value γ (steps S14 and 15). Next, when the number L _L exceeds a predetermined value γ, the vibration power spectrum value P _{LN of the} mountain portion and the average values P _LA and θ _LA of the phase difference θ _LN at that time are calculated, and the mountain portion period T _L is calculated. The average value of T _LA
Is calculated, and the standard deviation (variation) σ _L of the phase difference θ _LA is calculated (steps S16-18). Next, the measurement end lamp 28 is turned on, the counter C is counted up, and when the counter C is 1, that is, in the case of the current vector,
The average values P _LA , θ _LA , and T _LA are the current vibration power spectrum value P _L , the current phase difference θ _L , and the current mountain period T _PI , and the standard deviation σ _L is the current standard deviation σ _LI (steps S19 to 2).
1).

Next, with the dummy weight of weight Wo added at the position where the phase of the tire 15 is 0 °, the tire 1
When the start switch 25 is turned on after rotating the vehicle No. 5 at a rotational speed at which the vehicle speed becomes 110 km, the average values P _LA , θ _LA , T _LA , and the standard deviation σ _L are calculated by the same operation as above (steps S1 to S1). 18). Next, the measurement end lamp 2
8 is turned on, the counter C is counted up, and when the counter C is 2, that is, when the vector is 0 °, the average values P _LA , θ _LA , and T _LA are 0 ° vibration power spectrum value P _L0 ,
0 ° phase difference θ _L0 , 0 ° peak period T _P0 , standard deviation σ _L
As 0 ° standard deviation σ _L0 (steps S19, 20, 2)
2, 23).

Next, with the dummy weight of a predetermined weight added to the position where the phase of the tire 15 is 180 °, the tire 15 is rotated at a rotation speed such that the vehicle speed is 110 km, and then the start switch 25 is turned on. By the same operation as above, average values P _LA , θ _LA , T _LA , and standard deviation σ _L are calculated (steps S1 to 18). Next, the measurement end lamp 28 is turned on and the counter C is counted up. When the counter C is 3, that is, when it is a 180 ° vector, the average values P _LA , θ _LA , and T _LA are 180 ° vibration power spectrum values. P _L180 , 180 ° phase difference θ _L180 , 180 ° peak period T _P180, and standard deviation σ _L is 180 ° standard deviation σ
_L180 (steps S19, 20, 22, 24).

Next, the differences ΔT ₁ = T _P0 -T _PI , ΔT ₂ = T
_{When P0-} T _P180 is calculated and | ΔT ₂ | is smaller than the predetermined value Tα and | ΔT ₁ | is smaller than the predetermined value Tα, the peak periods T _PI , T _P0 , and T _P180 are substantially equal, and _therefore FIG. As shown in FIG. 5, it is determined that the vibration due to the imbalance is stably measured, and therefore the magnitude of the imbalance vector V _I is | V _I | and the magnitude of the vector V _D is | V _D |. At this time, the unbalance amount Un is calculated from the following equation, and the unbalance phase θ _N is calculated (steps S25 to S2-2).
8).

U _N = 2W _D × | V _I | / | V _D | Next, the liquid crystal display 3 displays the correction unbalance amount and the correction position.
4, the correction imbalance amount and the correction phase are printed by the printer 35, and then the count C is set to 0.
(Steps S33, 34).

Further, | ΔT ₂ | is smaller than the predetermined value Tα,
Further, when | ΔT ₁ | is larger than the predetermined value Tα, the difference between the peak period T _P0 and the peak period T _PI is large, so that the vibration due to the imbalance is not stably measured as shown in FIG. Therefore, the size of the midpoint vector V _M is
V _M |, the unbalance amount Un is calculated from the following equation and the unbalance phase θ _N is calculated (step S
25-28).

U _N = 2W _D × | V _M | / | V _D | Next, the liquid crystal display 3 displays the correction unbalance amount and the correction position.
4, the correction imbalance amount and the correction phase are printed by the printer 35, and then the count C is set to 0.
(Steps S33, 34).

Further, | ΔT ₂ | is larger than the predetermined value Tα,
When | ΔT ₁ | is smaller than the predetermined value Tα, the peak period T _P0 and the peak period T _PI are substantially equal to each other, and the peak period T
_Since the difference between _P0 and the peak period T _P180 is large, it is determined that the vibration due to the unbalance of 180 ° unbalance is not stably measured by the dummy weight as shown in FIG. The unbalance amount Un is calculated and the unbalance phase θ _N is calculated (step S
25, 26, 30, 31).

U _N = W _D × | V _I | / | V _D | Next, the liquid crystal display 3 displays the correction unbalance amount and the correction phase.
4, the correction unbalance amount and the correction phase are printed by the printer 35, and the counter C is set to 0 (steps S33 and S34).

Further, | ΔT ₂ | is larger than the predetermined value Tα,
When | ΔT ₁ | is larger than the predetermined value Tα, the difference between the _peak period T _P0 and the peak period T _P180 and the difference between the peak period T _P0 and the peak period T _PI are large.
Since it is determined that the vibration due to the unbalance of the unbalance is not stably measured, the unbalance amount U _N is calculated from the following equation and the unbalance phase θ _N is calculated (steps S25, 26, 30, 32). ).

U _N = W _D × | V _I | / | V _D | Next, the liquid crystal display 3 displays the correction unbalance amount and the correction phase.
4, the correction unbalance amount and the correction phase are printed by the printer 35, and the counter C is set to 0 (steps S33 and S34).

In such a tire balance measuring device, according to the sizes of the _peak periods T _PI , T _P0 and T _P180 ,
Imbalance vector V _I, the vector V _D, the amount of imbalance from the midpoint vector V _M U _N, and determine the imbalance phase theta _N, Yamabe period T _PI, T _P0, T _P180 unbalance vector V _I, Since it corresponds to the unbalance amount of V ₀ and V ₁₈₀ or the stable state of the vibration due to the unbalance, it is necessary to select one of the unbalance vectors V _I , V ₀ , and V ₁₈₀ for which the unbalanced vibration is stably measured. The unbalance amount and the unbalance phase can be calculated by using this. For this reason, the sensitivity of the acceleration sensor 20 and the influence of other vibrations of the vehicle are reduced, and the S / N ratio is improved, so that the imbalance can be accurately measured.

FIG. 10 is a block diagram showing another tire balance measuring device according to the present invention. As shown in the figure,
A phase difference variation detecting means 9 for detecting the variation of the phase difference calculated by the phase difference computing means 5 is provided, and the output signals of the rotational frequency analyzing means 3 and the phase difference computing means 5 are unbalanced according to the variation of the phase difference. An unbalance calculation means 10 for calculating the amount and the unbalance phase is provided.
The tire balance measuring device has the mechanical portion shown in FIG. 2 and the analyzing device shown in FIG. 3, and the microcomputer 31 has a frequency analyzing means 3, a rotation primary calculating means 4, a phase difference calculating means 5, and a fluctuation. It has a peak change detection means 6, a phase difference variation detection means 9, and an unbalance calculation means 10. The storage means (not shown) of the microcomputer 31 has the programs shown in the flowcharts of FIGS. 4, 5 and 11. Is remembered.

Next, the operation of the tire balance measuring device shown in FIG. 10 will be described. First, similarly to the tire balance measuring device shown in FIGS. 1 to 3, the present vibration power spectrum value P _L , the present phase difference θ _L , the present mountain portion cycle T _PI ,
Current standard deviation σ _LI , 0 ° vibration power spectrum value P _L0 ,
0 ° phase difference θ _L0 , 0 ° peak period T _P0 , 0 ° standard deviation σ _L0 , 180 ° vibration power spectrum value P _L180 , 180
° Phase difference θ _L180 , 180 ° crest part period T _P180 , 180 ° standard deviation σ _L180 are obtained (steps S1 to 24).

Next, when the 0 ° standard deviation σ _L0 , the 180 ° standard deviation σ _L180 , and the current standard deviation σ _LI are smaller than a predetermined value σα, vibration due to imbalance is stably measured as shown in FIG. If the magnitude of the unbalance vector V _I is | V _I | and the magnitude of the vector V _D is | V _D |, the unbalance amount Un is calculated from the following equation and The phase θ _N is calculated (steps S35-38).

U _N = 2W _D × | V _I | / | V _D | Next, the liquid crystal display 3 displays the correction unbalance amount and the correction position.
4, the correction imbalance amount and the correction phase are printed by the printer 35, and then the count C is set to 0.
(Steps S42 and 43).

Further, the 0 ° standard deviation σ _L0 and the 180 ° standard deviation σ _L180 are smaller than a predetermined value σα, and the current standard deviation σ
When _LI is greater than the predetermined value σα, as shown in FIG. 8, the vibration caused by imbalance is determined not to be measured stably, the magnitude of the midpoint vector V _M | V _M |
Then, the unbalance amount Un is calculated from the following equation, and the unbalance phase θ _N is calculated (step S35).
~ 37, 39).

U _N = 2W _D × | V _M | / | V _D | Next, the liquid crystal display 3 displays the correction unbalance amount and the correction position.
4, the correction imbalance amount and the correction phase are printed by the printer 35, and then the count C is set to 0.
(Steps S42 and 43).

Further, 0 ° standard deviation sigma _L0 is smaller than the predetermined value Shigumaarufa, and when 180 ° standard deviation sigma _{L1 80} is larger than the predetermined value Shigumaarufa, as shown in FIG. 9, Ann 180 ° unbalanced by the dummy weight Since it is determined that the vibration due to the balance is not stably measured, the unbalance amount Un is calculated from the following equation and the unbalance phase θ _N is calculated (steps S35, 36, 40).

U _N = W _D × | V _I | / | V _D | Next, the liquid crystal display 3 displays the correction unbalance amount and the correction phase.
4, the correction unbalance amount and the correction phase are printed by the printer 35, and the counter C is set to 0 (steps S42 and 43).

Further, when the 0 ° standard deviation σ _L0 is larger than the predetermined value σα, it is determined that the vibration due to the unbalance of 0 ° unbalance is not stably measured by the dummy weight. The amount Un is obtained and the unbalanced phase θ _N is obtained (steps S35 and 41).

U _N = W _D × | V _I | / | V _D | Next, the liquid crystal display 3 displays the correction unbalance amount and the correction phase.
4, the correction unbalance amount and the correction phase are printed by the printer 35, and the counter C is set to 0 (steps S42 and 43).

In such a tire balance measuring device, the unbalance vector V _I , the vector V _D , and the medium V _D are determined according to the magnitudes of the 0 ° standard deviation σ _L0 , the 180 ° standard deviation σ _L180 , and the current standard deviation σ _LI. The unbalance amount U _N and the unbalance phase θ _N are obtained from the point vector V _M, and the standard deviations σ _L0 , σ _L180 and σ _LI are the unbalance vectors V _I , V ₀ ,
Since it corresponds to the unbalance amount of V ₁₈₀ or the stable state of the vibration due to the unbalance, the unbalance vector V _I , V ₀ , or V ₁₈₀ that is stably measured due to the unbalance is used. The balance amount and the unbalanced phase can be calculated. For this reason, the sensitivity of the acceleration sensor 20 and the influence of other vibrations of the vehicle are reduced, and the S / N ratio is improved, so that the imbalance can be accurately measured.

Although the tire balance measuring device has been described in the above embodiments, the present invention can be applied to a rotating body balance measuring device for measuring the imbalance of other rotating bodies such as a propeller shaft. Also,
In the above-described embodiment, the tire 15 has a vehicle speed of 110 km.
However, the tire 15 may be rotated at other vehicle speeds.

[0040]

As described above, in the rotating body balance measuring device according to the present invention, the sensitivity of the vibration detecting means and the influence of other vibrations of the vehicle are reduced, so that the S / N ratio is reduced.
Since the ratio is improved, the unbalance amount and the unbalance phase can be accurately measured.

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing a tire balance measuring device according to the present invention.

FIG. 2 is a perspective view showing a mechanical portion of the tire balance measuring device shown in FIG.

3 is a block diagram showing an analyzing device of the tire balance measuring device shown in FIG. 1. FIG.

FIG. 4 is a flowchart of the operation of the tire balance measuring device shown in FIGS. 1 to 3.

FIG. 5 is a flowchart of the operation of the tire balance measuring device shown in FIGS.

FIG. 6 is a flowchart of the operation of the tire balance measuring device shown in FIGS. 1 to 3.

FIG. 7 is a diagram for explaining the operation of the tire balance measuring device shown in FIGS. 1 to 3.

FIG. 8 is a diagram for explaining the operation of the tire balance measuring device shown in FIGS. 1 to 3.

FIG. 9 is a diagram for explaining the operation of the tire balance measuring device shown in FIGS. 1 to 3.

FIG. 10 is a schematic block diagram showing another tire balance measuring device according to the present invention.

11 is a flowchart of the operation of the tire balance measuring device shown in FIG.

FIG. 12 is a view for explaining the operation of the conventional tire balance measuring device.

FIG. 13 is a diagram for explaining the operation of the conventional tire balance measuring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rotation detection means 2 ... Vibration detection means 3 ... Frequency analysis means 4 ... Rotation primary calculation means 5 ... Phase difference calculation means 6 ... Fluctuation peak detection means 7 ... Peak period detection means 8 ... Unbalance calculation means 9 ... Phase difference Variation detecting means 10 ... Unbalance calculating means

Claims (5)

[Claims] 1. A rotation detecting means for detecting a rotating state of a rotating body and outputting a rotation detecting signal, and a vibration detecting means for detecting a vibrating state when the rotating body is rotated and outputting a vibration detecting signal. Frequency analysis means for frequency-analyzing the vibration detection signal, rotation primary calculation means for obtaining a rotation primary frequency from an output signal of the frequency analysis means, the rotation detection signal and the vibration detection at the rotation primary frequency. The phase difference calculating means for obtaining the phase difference from the signal, the fluctuation peak detecting means for detecting the peak of the fluctuation of the vibration power spectrum value at the primary rotation frequency from the output signal of the frequency analyzing means, and the peak cycle The peak cycle detecting means for detecting, and the unbalance amount and the imbalance of the rotating body from the output signals of the frequency analyzing means and the phase difference calculating means in accordance with the cycle of the peak. Rotating body balance measuring apparatus characterized by comprising the imbalance calculating means for calculating a scan phase. 2. The unbalance calculation means for calculating the unbalance amount and the unbalance phase according to the relationship between the cycle of the peak when the weight is not added and the cycle of the peak when the weight is added. The rotating body balance measuring device according to claim 1, which is used. 3. As the unbalance calculation means, when the cycle of the peak when the weight is not added is smaller than the cycle of the peak when the weight is added, the frequency analysis means and the phase difference calculation means when the weight is added. The rotating body balance measuring device according to claim 2, wherein a device that calculates the unbalance amount and the unbalance phase from an output signal is used. 4. A rotation detecting means for detecting a rotation state of a rotating body and outputting a rotation detection signal, and a vibration detecting means for detecting a vibration state when the rotating body is rotated and outputting a vibration detection signal. Frequency analysis means for frequency-analyzing the vibration detection signal, rotation primary calculation means for obtaining a rotation primary frequency from an output signal of the frequency analysis means, the rotation detection signal and the vibration detection at the rotation primary frequency. Phase difference calculating means for obtaining the phase difference with the signal, phase difference variation detecting means for detecting the variation of the phase difference from the output signal of the phase difference computing means, the frequency analyzing means according to the variation of the phase difference, and An unbalance calculating means for calculating an unbalance amount and an unbalance phase of the rotating body from an output signal of the phase difference calculating means. Measuring device. 5. The rotating body balance measuring device according to claim 4, wherein a means for calculating the standard deviation of the phase difference is used as the phase difference variation detecting means.