JPH0954017A - Gear engagement testing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a gear engagement testing method as being capable of detecting damages and nicks on a gear with high sensitivity and precision and judging a product to be good or not. SOLUTION: In each of four combined patterns, vibration caused by engaging a drive gear 3 with a driven gear 4 to be rotated is detected by a vibration sensor 10 to judged a product to be good or not by a convergent value of a peak hold integral value detected by a FFT analyzer 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear meshing inspection method for judging the quality of a pair of gears meshing with each other.
In particular, the present invention relates to a gear meshing inspection method for determining the quality by detecting vibrations generated by the rotation of a pair of gears.

[0002]

2. Description of the Related Art As the performance of vehicles has been improved, demands for reducing the noise generated by the vehicles have become strict. A sound generated by a vehicle, for example, when a drive gear and a driven gear of an oil pump of an AT transmission are meshed with each other and rotated, a sound caused by a scratch or a dent on the drive gear or the driven gear is generated.

With respect to the sound caused by scratches or dents on the drive gear or the driven gear, it is difficult to judge the quality by checking the gear alone, and the gear meshing inspection is carried out with the combination of the drive gear and the driven gear meshed together. The quality is judged by the method.

As a conventional gear mesh inspection method, there are known a sensory inspection method, a sound pressure measuring method, a vibration measuring method, and the like, which a human can judge by hearing (using a dem gear speeder M / C).

Further, in the conventional gear meshing inspection method,
The engagement of the driving gear and the driven gear is performed by a method called center engagement in which the centers of the respective gear widths are aligned so that the end faces of the gears are easily contacted.

[0006]

The sensory inspection method for humans to judge by auditory sense requires the skill of the inspector, and in the vicinity of the boundary between the non-defective product and the defective product, even if the same sound is heard, the inspector judges the pass / fail. There is a problem that is different. Further, since the quality judgment is different depending on the influence of ambient noise, it is necessary to always keep the environmental conditions in the same state.

In the sound pressure measuring method, a sound pressure meter can be used to measure the sound pressure level generated by the meshing of gears, and the quality of the gear can be determined according to the measured sound pressure level. When the ambient noise is detected, there is a problem that a good gear is determined as a defective product from the sound pressure measurement result.

Since the vibration measuring method detects the vibration due to the meshing of gears, it is not affected by ambient noise, but there is a problem that the drive system such as a motor for rotating the gear affects the measuring system.

Further, the scratches and dents on the gear are small (however,
If the generated sound is not negligible), the vibration is small, and there is no clear significant difference between the data values of the non-defective product and the defective product depending on the measurement system and the processing method.

For example, the vibration is detected by a vibration pickup or the like and converted into an electric signal to process the average value or the effective value (RMS).
In many cases, it is impossible to distinguish good products from bad products even if they are processed.

Further, when the driving gear and the driven gear are assembled in the engine or the mission, there are influences of the assembling conditions and other parts, and accurate center meshing is not performed as in the meshing inspection. Vibration may occur due to scratches or dents on the gear end surface that do not occur during the centering meshing inspection.

The present invention has been made to solve the above problems, and its object is to detect a defective gear by detecting vibration even if the gear has small scratches or dents. An object of the present invention is to provide a mating inspection method.

[0013]

In order to solve the above-mentioned problems, a gear meshing inspection method according to the present invention comprises a pattern (X1) for meshing one half width of a driven gear with a drive gear to carry out the inspection. A pattern (X2) in which the inspection is performed by traversing the driven gear and engaging the other half of the gear half width with the drive gear only when the inspection result is determined to be good.
It is characterized by having.

Further, in each pattern (X1, X2) of the gear meshing inspection method according to the present invention, a pattern (Y1) for executing the inspection by rotating the drive gear in the clockwise direction and the inspection result are good. Only when it is determined that the drive gear is rotated counterclockwise to perform the inspection (Y2)
And characterized in that:

Further, there are four kinds of combination patterns (X1 / Y) in which the respective patterns (X1 and X2, Y1 and Y2) are combined.
1, X1 / Y2, X2 / Y1, X2 / Y2) is characterized by judging the quality of the pair of gears according to the following steps. Step 1: Set a pair of gears on the tester and engage them. Step 2: Rotate the pair of gears meshed with each other at a predetermined rotation speed. Step 3: The vibration sensor detects the vibration generated as the gear rotates. Step 4: The vibration detected by the vibration sensor is displayed as an electric signal in the time domain for each frame of a predetermined time set in advance,
Find the maximum amplitude. Step 5: Fast Fourier transform (FFT) is performed on the electric signal of each frame in the time domain to obtain the power spectrum in the frequency domain, and then the power spectrum integral value obtained by integrating the power spectrum is calculated and displayed. Step 6: Only the peak value of the power spectrum of each frame is stored, and the peak hold power spectrum value is obtained by sequentially superimposing the power spectrum peak value of each frame on the power spectrum of the first frame. Step 7: The peak hold power spectrum value obtained in step 6 is integrated in a predetermined frequency range to obtain a peak hold integrated value. Step 8: The number of peak hold additions N is increased to calculate the converged value of the peak hold integrated value. Step 9: The convergence value of the peak hold integrated value calculated in step 8 is compared with a preset reference convergence value to judge the quality of the gear.

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 are block diagrams of the gear meshing tester. 1 is an overall configuration diagram of a gear meshing tester to which the gear meshing inspection method according to the present invention is applied, and FIG. 2 is a structural diagram of a gear meshing tester to which the gear meshing inspection method according to the present invention is applied. Is.

1 and 2, a gear meshing tester 1 includes a housing 2 and a housing 2 having a vibration-proof structure.
A pair of drive gears 3 and driven gears 4 arranged on the upper surface of the motor, an adjuster 5 for adjusting the positions of the driven gears 4 meshing with the drive gears 3, a motor 6, and a pulley 7 for transmitting the rotational force of the motors 6 to the drive gears 3. , A pulley 8 and a belt 9.

The pair of drive gear 3 and driven gear 4 are set on mandrel clamps 14A and 14B provided on the upper surface of the housing 2, respectively, and the driven gear 4 is adjusted in height via an adjuster 5 to drive gears. The meshing position with 3 is adjusted.

As shown in FIG. 2, the height of the driven gear 4 is adjusted by raising the driven gear support member connected to the adjuster 5 (actual battle display) so that the lower half width of the gear width of the driven gear 4 is reduced. And the drive gear 3 are engaged.

On the other hand, the driven gear support connected to the adjuster 5 is lowered (shown in a broken line) to engage the upper half width of the driven gear 4 with the drive gear 3.

The driving gear 3 and the driven gear 4 are fixed by mandrel clamps 14A and 14B provided on the driving gear support and the driven gear support, respectively.

In this way, by positively engaging the lower half width or the upper half width of the driven gear 4 with the drive gear 3, it is possible to detect scratches or dents on the gear end surface which are difficult to detect by the central meshing. You can

After the pair of drive gear 3 and driven gear 4 have been set, the motor 6 is driven and the rotational force of the motor 6 causes the drive gear 3 to rotate at a predetermined rotational speed via the pulley 7, belt 9 and pulley 8. By rotating, the driven gear 4 meshed with the drive gear 3 also rotates at a predetermined rotation speed.

The rotation direction and the number of rotations of the motor 6 are driven by a motor drive signal SM supplied from the control device 13, and a clockwise or counterclockwise rotation direction is set. The motor 6 is fixed to the housing 2 with a support having an earthquake-proof structure, and prevents vibrations accompanying the rotation of the motor 6 from entering the measurement system.

The clockwise or counterclockwise rotation of the motor 6 is transmitted to the drive gear 3 via the pulley 7, the belt 9 and the pulley 8 to rotate the drive gear 3 clockwise or counterclockwise, respectively.

As described above, the gear meshing test pattern includes the pattern (X1) for meshing the lower half width of the gear width of the driven gear 4 and the drive gear 3, the upper half width of the gear width of the driven gear 4, and the drive gear 3. There are two types of patterns (X2) for engaging with each other.

Further, in each of the two kinds of meshing patterns, the pattern (Y1) in which the drive gear 3 rotates clockwise
And the drive gear 3 rotates counterclockwise (Y2)
The meshing test was carried out on all four combination patterns obtained by combining the two types of rotation patterns described above, and it was judged as a good product only when all four combination patterns were judged as good products,
If even one of the four types of combination patterns is determined to be defective, it is determined to be defective.

The four types of combination patterns are the clockwise (X1 / Y1) combination pattern for the lower half-width engagement and the counterclockwise rotation (X1 / Y2) for the lower half width engagement.
Combination pattern, upper half-width engagement, clockwise rotation (X
2 / Y1) combination pattern and (X2 / Y2) combination pattern of counterclockwise rotation with upper half width engagement.

Further, in FIG. 1, a gear meshing tester 1
Is a vibration sensor 10 for detecting vibration generated by the rotation of the pair of drive gear 3 and driven gear 4, a charge amplifier 11 for amplifying an electric vibration signal V _O1 detected by the vibration sensor 10, and a charge amplifier 11. An FFT analyzer 12 that performs signal processing by performing a fast Fourier transform (FFT) on the output signal V _O2 , a motor 6, a regulator 5, and a controller 13 that controls the operations of the FFT analyzer 12.

The vibration generated by the vibration of the pair of drive gear 3 and driven gear 4 is detected in the vibration sensor 10 arranged at a predetermined position of the housing 2 and converted into an analog electric signal in the time domain. The vibration signal V _O1 is supplied from the vibration sensor 10 to the charge amplifier 11. The location of the vibration sensor 10 is not limited to the housing 2, but may be any location where vibration can be detected significantly.

The output signal V _O2 of the vibration signal V _O1 amplified by the charge amplifier 11 is supplied to the FFT analyzer 12, and the maximum value of the output signal V _{O2 in} the time domain for each predetermined time frame is detected.

FIG. 3 shows a time domain signal waveform diagram for each predetermined time frame of vibration. In FIG. 3, each frame F ₁ ~
For example, F _N is set to 0.2 seconds, and the maximum value of each frame F _{1 to} F _{N is} calculated. This maximum value corresponds to scratches and dents on the pair of drive gears 3 and driven gears 4 if there is no noise that is constantly mixed. It is used to judge.

The output signal V _O2 is Fourier-transformed by the FFT analyzer 12 to obtain a power spectrum in the frequency domain corresponding to the output signal V _O2 for each predetermined time frame, and an integral value waveform obtained by integrating the power spectrum is displayed. .

FIG. 4 shows a power spectrum integral value waveform diagram in the frequency domain corresponding to each frame in FIG. In FIG. 4, the power spectrum integral value waveform from _one frame (F ₁ ) to an arbitrary N frame (F _N ) and F ₁ to
The arithmetic mean value waveform of the power spectrum integral values up to F _N is displayed as a frame F _NA .

Further, the FFT analyzer 12 is arranged so that each frame in the frequency domain corresponding to a predetermined time frame (F ₁ ~
Only the peak value of the power spectrum is stored for each F _N ), and the peak values stored in the power spectrum of the first frame (F ₁ ) are sequentially superimposed up to the F _N frame, and finally the F _NP frame. The peak hold power spectrum waveform of is displayed.

FIG. 5 shows the power spectrum of each frame.
The peak hold power spectrum waveform diagram which superimposed the peak value on the power spectrum of the 1st frame in order is shown. In FIG. 5, since the peak value of the power spectrum increases as the number of frames increases, the number of vibrations can be detected with a sufficient significant difference by increasing the number of frames. In particular, any frame F
_The peak-hold power spectrum with peak values up to _N is large corresponding to the amount of vibration when the pair of gears (driving gear 3 and driven gear 4) have large scratches or dents and generate large vibrations. Indicates a value.

FIG. 6 shows a characteristic diagram of the power spectrum integrated average value (K _A ) and the peak hold power spectrum value (K _P ) in the frequency domain. With these two types of characteristics, even if the vibration generated from the pair of gears (driving 3 and driven gear 4) is the same, the significant difference between the good gear and the defective gear is large due to the signal processing of the vibration signal V _O1. Show different things.

In FIG. 6, FIG. 6A shows the addition average value K _A of the power spectrum integrated values, and FIG. 6B shows the peak hold power spectrum value (peak hold value) K _P. In the arithmetic mean value K _A in the figure (a), for example, a significant difference between the arithmetic mean value K _AN indicating a good gear and the arithmetic mean values K _A1 and K _A2 indicating a gear defective product is small, and particularly a gear defective product is shown. In some cases, the added average value K _A1 is determined to be a good gear.

In the peak hold value K _P in the diagram (b), for example, a significant difference between the peak hold value K _PN indicating a good gear and the peak hold values K _P1 and K _P2 indicating a defective gear is large, and the peak hold value K _P is not good. It is possible to reliably judge good products.

Subsequently, the FFT analyzer 12 sets the peak hold power spectrum in which the peak values up to the frame F _{N of} FIG. 5 are superimposed on a predetermined frequency range (for example, 3).
The vibration integrated value K integrated at 70 Hz to 2 KHz) is calculated, the peak hold addition number N is sufficiently increased to obtain the convergent value of the vibration integrated value K, and a good or defective gear is determined based on this convergent value.

FIG. 7 shows a convergence characteristic diagram of the vibration integral value (K) of the peak hold value corresponding to the number of peak hold additions (N). In FIG. 7, (a) shows the convergence characteristic of the vibration integral value (K) of the defective gear, and (b) shows the convergence characteristic of the vibration integral value (K) of the good gear.

In FIG. 5A, in the H1 characteristic to H5 characteristic of the vibration integrated value K of a defective gear, the same pair of gears is subjected to the calculation processing of the peak hold addition times N from 1 to 20 times five times. The number N of peak hold additions varies from 1 to 10 times, but
After a certain number of times, it converges to a constant vibration integral value K _O2 .

On the other hand, in FIG. 7B, the G1 characteristic to G5 characteristic of the vibration integrated value K of the good gear has almost no variation in the characteristic due to the peak hold addition number N in all five times.
Calculation processing 5 when the peak hold addition count N is 15 or more
It converges to a constant vibration integral value K _O1 for each repetition.

Thus, the convergence value K _O1 of the amplitude integral value K of the non-defective gear and the convergence value K _O2 of the non-defective gear can be set by setting the peak hold addition number N to 15 times or more (for example, 20 times). It can be adopted for pass / fail judgment by one-time arithmetic processing.

The convergence value of the amplitude integrated value K of the non-defective gear is set in advance with the convergence value K _{O1 of the} gear considered to be non-defective as a reference value, and the convergence value of the amplitude integrated value K of the pair of gears to be inspected is set. The convergence value K _ON is compared with the reference value K _O1, and the convergence value K _ON
Exceeds the upper limit of the reference value K _O1 (K _O1 + ΔK) (K _ON >
If K _O1 + ΔK), it is determined as a defective product.

On the other hand, the convergence value K _ON of the amplitude integral value K of the pair of gears to be inspected is within the permissible range (K _O1 ± ΔK) of the reference value K _O1.
(K _O1 −ΔK ≦ K _ON ≦ K _O1 + ΔK), it is determined as a non-defective product.

The setting of the reference value K _O1 may be determined by a sensory test method for audibly determining the vibration sound of the gear.

The defect of the pair of gears to be inspected is determined by
If even one of the four types of combination patterns is determined to be defective, the inspection is stopped. However, if one combination pattern is determined to be a non-defective product, the amplitude integrated value of the next combination pattern is determined. The process is repeated until the convergence value is detected and a non-defective product is determined, and then the same process is repeated for the third and fourth combination patterns to finish the inspection only when all four combination patterns are determined to be non-defective products. To do.

The determination result of the good or defective gear is F
Vibration detection data D _O output from the FT analyzer 12
Based on the above, it is configured to display on an audible display (buzzer or the like) or a visual display not shown.

The control device 13 shown in FIG. 1 includes a sequencer for controlling the operation sequence of the gear meshing tester 1, a controller for controlling the operation, and the like, and supplies the adjustment signal SA to the adjuster 5 in accordance with the sequencer procedure. The height position of the driven gear 4 is set so that the lower half width of the gear width of the driven gear 4 and the drive gear 3 mesh (pattern X1), or the upper half width of the gear width of the driven gear 4 and the drive gear 3 mesh. Set to match (pattern X2).

Further, the control device 13 supplies the motor drive signal SM to the motor 6 in accordance with the sequencer procedure to control the start and stop of the motor 6 and the rotation speed and rotation direction of the motor 6. The rotation direction of the motor is set clockwise (pattern Y1) or counterclockwise (pattern Y2).

The sequencer is arranged such that the lower half width of the driven gear 4 and the driving gear 3 mesh (pattern X1) and the driving gear 3 rotates clockwise (pattern Y1) or the driving gear 3 rotates counterclockwise (pattern Y1). Y2) and the combination pattern (X1 / Y1 and X1 / Y2), and the upper half width of the gear width of the driven gear 4 and the driving gear 3 meshing (pattern X2) and the clockwise rotation of the driving gear 3 (pattern Y1) or A command is issued to repeatedly inspect the four combination patterns (X2 / Y1 and X2 / Y2) in combination with the counterclockwise rotation of the drive gear 3 (pattern Y2) in an arbitrary order set in advance.

Further, the control device 13 provides the FFT analyzer 12 with a plurality of control signals SF to display the time domain signal waveform, calculate the power spectrum integral value in the frequency domain and display the waveform, and integrate the oscillation of the peak hold value. Controls the value calculation.

As described above, by applying the gear meshing inspection method according to the present invention, the vibrations generated in the four combination patterns in which the pattern of meshing a pair of gears and the rotation pattern of the drive gear are combined are respectively generated. It is possible to detect small scratches and dents on the gear with high sensitivity and high accuracy by detecting the vibration integrated value of the peak hold spectrum in the combination pattern, obtaining the convergence value of the vibration integrated value, and repeating the quality judgment. it can.

Next, an execution flow of the gear meshing inspection method according to the present invention will be described. First, the execution flow of the combination pattern will be described, and then the detailed execution flow of each combination pattern will be described. FIG. 8 shows an execution flow chart of a combination pattern of the gear meshing inspection method according to the present invention, and FIG. 9 shows an essential flow chart of the gear meshing inspection method according to the present invention. In addition, in FIG. 8, (X1 / Y
1) Combination pattern → (X1 / Y2) combination pattern →
The execution flow in the case of performing the inspection in the execution order of the (X2 / Y1) combination pattern → (X2 / Y2) combination pattern will be described, but the execution order of the combination pattern can be set arbitrarily.

In FIG. 8, in step S1, a combination pattern (X1 / Y1) in which the lower gear half width of the driven gear 4 and the driving gear 3 are meshed (X1 pattern) and the driving gear 3 is rotated clockwise (Y1 pattern). Pattern), a series of inspections for detecting the vibration and obtaining the convergence value K _ON of the vibration integrated value is executed.

Next, in step S2, and comparing the convergence value K _ON and the reference value K _O1 vibration integral values, performed whether the quality determination convergence value K _ON exceeds the reference value K _O1, X1 / Y
If it is determined that one pattern is non-defective, the process proceeds to step S3, and the inspection flow for the second combination pattern (X1 / Y2 pattern) is executed. On the other hand, when it is determined that the product is defective, the process proceeds to step S10, the defective product is determined, and the inspection ends.

In step S3, a combination pattern (X1 / Y2 pattern) obtained by engaging the lower half width of the driven gear 4 with the driving gear 3 (X1 pattern) and rotating the driving gear 3 counterclockwise (Y2 pattern). , A series of inspections until the vibration is detected again and the converged value K _ON of the vibration integrated value is obtained.

Subsequently, in step S4, similarly to step S2, the quality of the X1 / Y2 pattern is determined, and if the product is a good product, the process proceeds to step S5. On the other hand, when it is determined that the product is defective, the inspection is ended through step S10.

Also in the following, the upper half width of the driven gear 4 and the meshing of the driving gear 3 (X2 pattern) and the driving gear 3
Is rotated clockwise (Y1 pattern) in a combination pattern (X2 / Y1 pattern), a series of inspections for detecting the vibration and obtaining the converged value K _ON of the vibration integrated value are executed, and the quality is judged (step S5). , Step S6), and an inspection with a combination pattern (X2 / Y2 pattern) obtained by meshing the upper half width of the driven gear 4 and the driving gear 3 (X2 pattern) and rotating the driving gear 3 counterclockwise (Y2 pattern). Executed, the flow for determining pass / fail (steps S7 and S8) is executed to determine the final combination pattern (X2 / Y
When it is determined that the two patterns) are non-defective, the pair of gears that have been inspected are determined to be non-defective in step S9 and the inspection ends.

Next, the main part execution flow of the gear meshing inspection method of each combination pattern will be described. In FIG. 9, each of the four combination patterns (X1 / Y1, X1 / Y
2, X2 / Y1, X2 / Y2) may not include some of steps P1 to P12 or may have different states even in the same step depending on the order of inspection, but basically, the steps P1 to P8 Execute the flow in common.

The first combination pattern (X1 / Y1 pattern) differs from the other three combination patterns in that the drive 3 and the driven gear 4 are set on the mandrel clamps 14A and 14B, respectively, in step P1.

In the inspection flow of the first combination pattern (X1 / Y1 pattern), in step P1, the pair of drive gear 3 and driven gear 4 to be inspected are respectively attached to the mandrel clamps 14A and 14B of the gear meshing tester 1. After setting, the adjuster 5 adjusts the height of the driven gear 4 based on the control of the sequencer so that the lower gear half width of the driven gear 4 and the drive gear 3 mesh with each other. (X1 pattern)

Next, at step P2, the motor 6 is driven under the control of the sequencer to rotate the drive gear 3 clockwise through the pulley 7, the belt 9 and the pulley 8 at a predetermined rotation speed. (Y1 pattern) Subsequently, in step P3, the vibration sensor 10 detects the vibration generated by the clockwise rotation of the pair of gears (the driving gear 3 and the driven gear 4).

In step P4, the vibration detected by the vibration sensor 10 is converted into an electric vibration signal V _O1 and passes through the charge amplifier 11 and the FFT analyzer 12 makes a predetermined time into one frame. It is displayed by the amplitude waveform of the area, and the maximum amplitude value is detected.

Next, in step P5, the amplitude waveform in the time domain consisting of a plurality of frames in step P4 is subjected to the fast Fourier transform (FFT), the power spectrum in the frequency domain corresponding to each frame in the time domain is calculated, and the power is further calculated. The integral value of the spectrum is calculated.

Then, in step P6, the maximum value of the power spectrum of each frame is detected and stored,
A peak hold power spectrum value is calculated by superimposing the maximum power spectrum value of the second and subsequent frames on the power spectrum of the first frame.

Further, in step P7, the amplitude integrated value obtained by integrating the peak hold / power spectrum value in the predetermined frequency range is calculated, and the peak hold addition number is repeated a plurality of times to calculate the converged value K _O2 of the amplitude integrated value. .

At step P8, the convergence value K of the amplitude integral value
_O2 and the reference value K of the convergence value corresponding to the preset good product
_O1 is compared, and the convergence value K _O2 exceeds the reference value K _O1 (K
_O2> is determined to be defective proceeds to step P9 when K _O1), whereas, the convergence value K _O2 reference value K _O1 following (K _O2 ≦ K
_In the case of _O1 ), the X1 / Y1 pattern is determined to be a good product,
After the drive gear 3 is temporarily stopped (not shown), the process proceeds to step P2 and the second combination pattern (X1 / Y2 pattern) is set.

If the X1 / Y1 pattern is determined to be defective in step P9, the rotation of the gear is stopped in step P11, and the gear is disengaged in step P12 to finish the inspection.

In step P2, since the second combination pattern (X1 / Y2 pattern) is set, the motor 6 is driven under the control of the sequencer to drive the drive gear via the pulley 7, belt 9 and pulley 8. 3 is rotated counterclockwise at a predetermined number of rotations (Y2 pattern), and the inspection flow of steps P3 to P8 is repeated with the X1 / Y2 pattern.

If the X1 / Y2 pattern is judged to be a non-defective product in step P8, the drive gear 3 is temporarily stopped (not shown) and then the process proceeds to step P2 via step P1 to proceed to the third combination pattern. (X2 / Y1 pattern)
Is set to

On the other hand, when the X1 / Y2 pattern is determined to be a defective product in step P8, the inspection is completed through steps P9 to P12 as in the case where the X1 / Y1 pattern is a defective product.

The regulator 5 and the motor 6 are driven under the control of the sequencer, and the third combination pattern (X2 /
Y1 pattern) and the second combination pattern (X
The inspection flow similar to that of (1 / Y2 pattern) is executed.

In the fourth combination pattern (X2 / Y2 pattern), after the steps P3 to P8 are executed, when the X2 / Y2 pattern is determined to be non-defective in step P8, the first to fourth steps are determined in step P10. All of the combination patterns are judged to be non-defective, the rotation of the gear is stopped in step P11, the gear is disengaged in step P12, and the inspection ends.

As described above, the gear combination inspection method according to the present invention makes it possible to sequentially perform the meshing inspection for all four combination patterns, and determine whether the gear to be inspected is good or defective. It is possible to accurately detect even small scratches or dents on the gear end surface.

[0077]

As described above, in the gear meshing inspection method according to the present invention, the pattern (X1) for meshing one of the half widths of the driven gear with the drive gear to perform the inspection,
A pattern (X2) in which the driven gear is traversed and the other half of the gear half width is engaged with the drive gear to perform the inspection only when the inspection result is determined to be good, and the gear that is difficult to detect in the central engagement is provided. Since small scratches and dents on the end surface can be accurately detected, it is possible to accurately select good or defective gears.

Further, in each pattern (X1, X2) of the gear meshing inspection method according to the present invention, the pattern (Y1) in which the drive gear is rotated in the clockwise direction to execute the inspection and the inspection result are good. Only when it is determined that the drive gear is rotated counterclockwise to perform the inspection (Y2)
And four combined patterns (X1) in which the driven gear is traversed to mesh the upper and lower gear half widths with the drive gear and the drive gear is rotated clockwise and counterclockwise.
/ Y1, X1 / Y2, X2 / Y1, X2 / Y2), it is possible to accurately detect small scratches and dents on the gear end face, which are difficult to detect with central meshing. The sorting can be performed with higher accuracy.

Furthermore, four combinations of patterns (X1 / Y2, Y1 and Y2) are combined (X1 / Y
1, X1 / Y2, X2 / Y1, and X2 / Y2) judge the quality of a pair of gears according to the following steps respectively, so small scratches and dents should be detected with high sensitivity as the convergence value of the amplitude integral value. You can Step 1: Set a pair of gears on the tester and engage them. Step 2: Rotate the pair of gears meshed with each other at a predetermined rotation speed. Step 3: The vibration sensor detects the vibration generated as the gear rotates. Step 4: The vibration detected by the vibration sensor is displayed as an electric signal in the time domain for each frame of a predetermined time set in advance,
Find the maximum amplitude. Step 5: Fast Fourier transform (FFT) is performed on the electric signal of each frame in the time domain to obtain the power spectrum in the frequency domain, and then the power spectrum integral value obtained by integrating the power spectrum is calculated and displayed. Step 6: Only the peak value of the power spectrum of each frame is stored, and the peak hold power spectrum value is obtained by sequentially superimposing the power spectrum peak value of each frame on the power spectrum of the first frame. Step 7: The peak hold power spectrum value obtained in step 6 is integrated in a predetermined frequency range to obtain a peak hold integrated value. Step 8: The number of peak hold additions N is increased to calculate the converged value of the peak hold integrated value. Step 9: The convergence value of the peak hold integrated value calculated in step 8 is compared with a preset reference convergence value to judge the quality of the gear.

Accordingly, it is possible to provide a gear meshing inspection method for detecting a scratch or a dent on a gear with high sensitivity and high accuracy and for determining a good product or a defective product.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a gear meshing tester to which a gear meshing inspection method according to the present invention is applied.

FIG. 2 is a structural diagram of a gear mesh tester to which a gear mesh inspection method according to the present invention is applied.

FIG. 3 is a time domain signal waveform diagram for each predetermined time frame of vibration.

FIG. 4 is a power spectrum integral value waveform diagram in the frequency domain corresponding to each frame in FIG.

FIG. 5 is a peak hold power spectrum waveform diagram in which the power spectrum peak value of each frame is sequentially superimposed on the power spectrum of the first frame.

[Fig. 6] Characteristic diagram of power spectrum integrated average value (K _A ) and peak hold power spectrum value (K _P ) in the frequency domain

FIG. 7 is a convergence characteristic diagram of a vibration integrated value (K) of a peak hold value corresponding to the number of peak hold additions (N).

FIG. 8 is an execution flow chart of a combination pattern of the gear meshing inspection method according to the present invention.

FIG. 9 is a flow chart showing an essential part of a gear meshing inspection method according to the present invention.

[Explanation of symbols]

1 ... Gear mesh tester, 2 ... Housing, 3 ... Drive gear, 4 ... Driven gear, 5 ... Regulator, 6 ... Motor, 7, 8 ...
Pulley, 9 ... Belt, 10 ... Vibration sensor, 11 ... Charge amplifier, 12 ... FFT analyzer, 13 ... Control device,
D _O ... Vibration detection data, K, K _O1 , K _O2 ... Vibration integral value,
K _A ... Power spectrum integrated average value, K _P ... Peak hold power spectrum value, V _O1 ... Vibration signal.

Claims (3)

[Claims] 1. A gear meshing inspection method for determining quality by detecting a vibration generated from a pair of gears by rotating a pair of gears composed of a drive gear and a driven gear in mesh with each other. A pattern (X1) in which one of the gear half widths is engaged with the drive gear to perform an inspection, and only when the inspection result is determined to be good, the driven gear is traversed to cause the other half of the gear half width to be the drive gear. And a pattern (X2) for performing an inspection by meshing with the gear. 2. Each pattern (X1, X2) includes a pattern (Y1) for performing an inspection by rotating the drive gear clockwise, and the pattern (Y1) only when the inspection result is determined to be good. And a pattern (Y2) in which a drive gear is rotated counterclockwise to carry out an inspection, and a gear meshing inspection method. 3. The gear meshing inspection method according to claim 4, wherein each of the four combinations of patterns obtained by combining the respective patterns determines the quality of the pair of gears according to the following steps. Step 1: Set a pair of gears on the tester and engage them. Step 2: Rotate the pair of gears meshed with each other at a predetermined rotation speed. Step 3: The vibration sensor detects the vibration generated as the gear rotates. Step 4: The vibration detected by the vibration sensor is displayed as an electric signal in the time domain for each frame of a predetermined time set in advance,
Find the maximum amplitude. Step 5: Fast Fourier transform (FFT) is performed on the electric signal of each frame in the time domain to obtain the power spectrum in the frequency domain, and then the power spectrum integral value obtained by integrating the power spectrum is calculated and displayed. Step 6: Only the peak value of the power spectrum of each frame is stored, and the peak hold power spectrum value is obtained by sequentially superimposing the power spectrum peak value of each frame on the power spectrum of the first frame. Step 7: The peak hold power spectrum value obtained in step 6 is integrated in a predetermined frequency range to obtain a peak hold integrated value. Step 8: The number of peak hold additions N is increased to calculate the converged value of the peak hold integrated value. Step 9: The convergence value of the peak hold integrated value calculated in step 8 is compared with a preset reference convergence value to judge the quality of the gear.