JPH0961300A - Method for examining meshing of gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for examining the meshing of a gear wherein a state close to automobile travel is reproduced to detect a flaw or a nick of the gear with high sensitivity and high accuracy to determine whether the gear is good or defective. SOLUTION: Vibration caused by making rotation with a driving gear 3 and a follower gear 4 meshed is detected by a vibration sensor 10 in four combined patterns respectively, and whether the gear is good or defective is determined from a convergence value of peak-hold integral values detected by an FFT(fast Fourier transform) 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.

Further, the sound generated by the gear engagement when the drive gear and the driven gear are installed in the engine or the mission and the vehicle actually travels is caused by rotating the drive gear as in the gear engagement test. Unlike the case where the driven gear that meshes with the drive gear is rotated freely, there is a problem that the conventional gear meshing test cannot reproduce because of the influence of the load connected to the driven gear.

The present invention has been made to solve such a problem, and its object is to reproduce a state close to running of a vehicle by detecting vibration even if a small scratch or dent is present in a gear. It is an object of the present invention to provide a gear meshing inspection method capable of reliably determining a defective gear.

[0014]

In order to solve the above problems, a gear meshing inspection method according to the present invention is provided with a drive side motor and a driven side motor for independently rotating a drive gear and a driven gear. , A pattern (X1) in which the drive side motor is rotationally controlled and the driven side motor is stopped and controlled to perform an inspection, and the driven side motor is rotationally controlled only when the inspection result is determined to be good, Pattern (X
2) and are provided.

Further, in each pattern (X1, X2) of the gear meshing inspection method according to the present invention, a pattern (Y1) for meshing one of the half widths of the driven gear with the drive gear to execute the inspection, Only when it is determined that the inspection result is good, a pattern (Y2) is provided 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.

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 the control states of the drive side motor and the driven side motor. Step 2: Set the engagement of the drive gear and the driven gear and rotate the motor. 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.

[0017]

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 gear 3 and driven gear 4 arranged on the upper surface of the drive gear, an adjuster 5 for adjusting the position of the driven gear 4 meshing with the drive gear 3, a drive side motor 6A for rotationally driving the drive gear 3, and a driven gear 4 are rotated. Pulleys 7A, 7A for transmitting the rotational force of the driven motor 6B, the driving motor 6A, and the driven motor 6B to be driven to the driving gear 3 and the driven gear 4, respectively.
B, belt 9A, and pulleys 8A, 8B, belt 9B
Is provided.

Drive side motor 6A or driven side motor 6B
Indicates that when one of them is rotationally controlled in the meshing test, the other is stopped and the driven motor 6B (or the driving motor 6A) which is stop-controlled rotates together with the driven gear 4 (or the driving gear 3). The load of the driving gear 3 (or the driven gear 4) is formed to reproduce a state in which the vehicle is close to actual traveling.

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 the 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 connected to the adjuster 5 (indicated by a solid line) 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 gear 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.

As described above, the drive side motor 6A and the driven side motor 6B are provided, and when one of them is rotationally controlled, the other is stopped and controlled to serve as a load, so that the vehicle is actually tested in the gear meshing test. It is possible to reproduce a state close to running.

Further, by positively engaging the lower half width or the upper half width of the driven gear 4 with the drive gear 3, scratches or dents on the gear end surface, which are difficult to detect by the central meshing in the gear meshing test, are performed. Can be detected.

When the drive side motor 6A is driven after the pair of drive gear 3 and driven gear 4 are set,
The rotational force of the drive side motor 6A is the pulley 7A, the belt 9A,
By rotating the drive gear 3 at a predetermined rotation speed via the pulley 7B, the driven gear 4 meshed with the drive gear 3 also rotates at a predetermined rotation speed.

In this state, the driven motor 6B is stopped and controlled, so that the driven gear 4 and the driven motor 6B are controlled.
Form a load on the rotational force of the drive gear 3.

On the other hand, when the driven motor 6B is driven,
The rotational force of the driven motor 6B is the pulley 8A, the belt 9B,
By rotating the driven gear 4 at a predetermined rotation speed via the pulley 8B, the drive gear 3 meshed with the driven gear 4 also rotates at a predetermined rotation speed.

In this state, the drive side motor 6A is stopped and controlled, so that the drive gear 3 and the drive side motor 6A are controlled.
Form a load on the rotational force of the driven gear 4.

Drive side motor 6A and driven side motor 6B
Are driven by motor drive signals SM1 and SM2 respectively supplied from the control device 13, and the rotational speed and either the clockwise or counterclockwise rotational direction are set. The drive-side motor 6A and the driven-side motor 6B are fixed to the housing 2 by a support having an earthquake-proof structure to prevent vibrations accompanying the rotation of the drive-side motor 6A or the driven-side motor 6B from entering the measurement system.

As described above, the gear meshing test pattern includes the pattern (X1) in which the drive side motor 6A is rotated in a predetermined direction and the meshing test is executed by using the stop side driven motor 6B as a load. Driven motor 6B
While rotating the drive motor 6A in the same direction,
There are two types of test patterns, that is, a pattern (X2) in which the meshing test is executed by using the drive-side motor 6A that is stop-controlled as a load.

Further, a pattern (Y1) in which the lower half width of the gear width of the driven gear 4 and the drive gear 3 are meshed with each of the above two test patterns, and an upper half width of the gear width of the driven gear 4 and the drive gear 3 are included. Only when all 4 combination patterns are judged to be non-defective by performing a meshing test on all 4 combination patterns which are the combination of 2 kinds of meshing patterns of 3 (Y2) The product is determined to be non-defective, and if at least one of the four types of combination patterns is determined to be defective, it is determined to be defective.

In the gear meshing test, the drive side motor 6A controls the rotation and the driven gear 4 meshes at the lower half width (X1).
/ Y1) combination pattern, the drive side motor 6A is in rotation control and the driven gear 4 is in upper half width engagement (X1 / Y2) combination pattern, the driven side motor 6B is in rotation control and the driven gear 4 is in lower half width engagement ( The X2 / Y1) combination pattern and the driven motor 6B are rotationally controlled so that the driven gear 4 is engaged in the upper half-width meshing (X2 / Y2) combination pattern.

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 drive side motor 6A, a driven side motor 6B, an adjuster 5, and a control device 13 that controls the operations of the FFT analyzer 12 are provided.

The vibrations generated by the vibrations of the pair of drive gears 3 and driven gears 4 corresponding to the above-mentioned four kinds of combination patterns are detected by, for example, a vibration sensor 10 arranged at a predetermined position of the housing 2 and analogized. The vibration signal V _O1 in the time domain converted into the electric signal 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 uses the frequency domain frames (F ₁ to
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, there is 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, which are 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 in} FIG. 5 are superimposed to 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. 7A, for the H1 characteristic to the H5 characteristic of the vibration integrated value K of a defective gear, the same pair of gears is subjected to the peak hold addition count N from 1 to 20 times and the calculation processing is repeated 5 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 due to the number of peak hold additions 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.

As described above, the convergence value K _O1 of the amplitude integral value K of the non-defective gear and the convergence value K _O2 of the defective gear are 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 integral 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 integral 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 allowable range of the reference value K _O1 (K _O1 ± ΔK).
(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.

As described above, in the steps of FIGS.
The gear is inspected for the combination pattern of the seeds, and the non-defective or defective gear is determined.

The inspection of the pair of gears to be inspected is stopped if at least one of the four types of combination patterns is inspected, but the inspection is stopped. If it is determined, the process of detecting the converged value of the amplitude integral value for the next combination pattern and determining the non-defective product is repeated, and then the same process is repeated for the third and fourth combination patterns. The inspection is ended only when all four combination patterns are determined to be non-defective.

The judgment result of the good or bad gear is F
Vibration detection data D _O output from the FT analyzer 12
Based on the above, an audible indicator (such as a buzzer) or a visual indicator (not shown) is displayed to make a NO / GO determination, and
The vibration detection data D _O is configured to be printed out as necessary.

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, etc., and supplies a motor drive signal SM1 to the drive side motor 6A according to the sequencer procedure. Then, the rotation number and the rotation direction of the drive side motor 6A are drive-controlled, and the motor drive signal SM2 is supplied to the driven side motor 6B to stop the driven side motor 6B (pattern X1).
The rotation direction of the motor is set to one of the clockwise direction and the counterclockwise direction.

On the other hand, the motor drive signal SM2 is supplied to the driven motor 6B to drive and control the rotation speed and rotation direction of the driven motor 6B (the same rotation direction as the driving motor 6A), and the motor drive signal SM1 is driven. Supply to the side motor 6A to stop the drive side motor 6A (pattern X
2).

Further, the control device 13 supplies the adjusting signal SA to the adjuster 5 in accordance with the procedure of the sequencer to drive the driven gear 4
Is set so that the lower half width of the gear width of the driven gear 4 meshes with the drive gear 3 (pattern Y1), or the upper half width of the gear width of the driven gear 4 meshes with the drive gear 3. (Pattern Y2).

The sequencer controls the driving of the driving motor 6A (pattern X1) and engages the lower half width of the gear width of the driven gear 4 with the driving gear 3 (pattern Y1) or the upper half width of the gear width of the driven gear 4. And a combination of the drive gear 3 (pattern Y2) (X1 / Y1 and X1 / Y)
2) and drive control of the driven-side motor 6B (Pattern X
2) and a combination pattern of the lower half width of the gear width of the driven gear 4 and the driving gear 3 (pattern Y1) or the upper half width of the gear width of the driven gear 4 and the driving gear 3 (pattern Y2). A command for repeatedly inspecting a total of four combination patterns of (X2 / Y1 and X2 / Y2) in a preset arbitrary order is generated.

The sequencer has four combination patterns (X1 / Y1, X1 / Y2, X2 / Y1 and X2 / Y).
For each of 2), the meshing inspection is executed in the steps shown in FIGS. 3 to 7, and a command for determining whether the gear is good or defective is generated.

Further, the control device 13 sends the FFT analyzer 12 a plurality of control signals SF according to the sequencer procedure.
To control the display of the time domain signal waveform, the calculation of the power spectrum integral value in the frequency domain and the display of the waveform, the calculation of the vibration integral value of the peak hold value, and the like.

As described above, the gear meshing inspection method according to the present invention is applied to the gear meshing tester 1, and two patterns (X) for driving and controlling the drive side motor or the driven side motor are used.
1, X2) and two types of patterns (Y1, Y2) in which a pair of gears are meshed are combined to detect vibrations generated by four combination patterns by detecting the integrated value of vibration of the peak hold spectrum in each combination pattern. ,
Further, by obtaining the convergent value of the vibration integral value and repeating the pass / fail judgment, it is possible to reproduce a state close to the running of the vehicle and detect small scratches and dents on the gear with high sensitivity and high accuracy.

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 step execution flow chart of the gear meshing inspection method according to the present invention. In FIG. 8, (X1 / Y1) combination pattern → (X1 / Y2) combination pattern → (X2 / Y1) combination pattern → (X2 / Y
2) The execution flow in the case of performing the inspection in the execution order of the combination patterns will be described, but the execution order of the combination patterns can be set arbitrarily.

In FIG. 8, in step S1, the drive side motor 6A is rotationally controlled, the driven side motor 6B is stopped and controlled, the drive gear 3 is rotated, and the driven gear 4 and the driven side motor 6B are loaded (pattern X1). And the driven gear 4
Meshing of the lower gear half width and the drive gear 3 (Y1 pattern)
With the combination pattern (X1 / Y1 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, the drive side motor 6A is rotationally controlled and the driven side motor 6B is stopped and controlled to drive the drive gear 3.
Is rotated and the driven gear 4 and the driven motor 6B are used as a load (pattern X1), and the upper gear half width of the driven gear 4 and the drive gear 3 are meshed (Y2 pattern) in a combined pattern (X1 / Y2 pattern). Then, a series of inspections is executed 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 non-defective 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.

In step 5, the driven motor 6B is rotationally controlled, the driving motor 6A is stopped and controlled, the driven gear 4 is rotated, and the driving gear 3 and the driving motor 6A are used as a load (pattern X2). , A series of inspections for detecting the vibration by the combination pattern (X2 / Y1 pattern) in which the lower half width of the driven gear 4 and the driving gear 3 are meshed (Y1 pattern), and obtaining the convergence value K _ON of the vibration integrated value. Run.

In step S6, the quality of the X2 / Y1 pattern is determined. If the product is a non-defective product, the process proceeds to step S7. If it is determined that the product is defective, the inspection is completed via step S10.

Subsequently, in step S7, the driven motor 6B is rotationally controlled, the driving motor 6A is stopped and controlled, the driven gear 4 is rotated, and the driving gear 3 and the driving motor 6A are loaded (pattern X2). In addition, a combination pattern (X2 / Y2 pattern) in which the upper half width of the driven gear 4 and the driving gear 3 are meshed (Y2 pattern) is used to detect vibration and obtain a convergence value K _ON of the vibration integrated value. Perform an inspection.

In step S8, a pass / fail judgment of the X2 / Y2 pattern is performed, and if the product is a non-defective product, the final non-defective product is executed in step S9. finish. On the other hand, when it is determined that the product is defective, the inspection is ended through step S10.

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 driving gear 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. Set and drive motor 6 based on the sequencer control
A is driven and controlled, and the driven motor 6B is stopped and controlled (X
1 pattern).

Next, in step P2, the adjuster 5 adjusts the height of the driven gear 4 based on the control of the sequencer to engage the lower gear half width of the driven gear 4 and the drive gear 3 (Y1 pattern). After that, the drive gear 3 is rotated in the combination pattern (X1 / Y1), and the driven gear 4 and the driven-side motor 6B are used as loads. Subsequently, in step P3, the vibration sensor 10 detects the vibration generated by the predetermined rotation direction (for example, clockwise rotation) of the drive gear 3.

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 N is repeated a plurality of times to calculate the converged value K _O2 of the amplitude integrated value. It

At step P8, the convergence value K of the amplitude integrated 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.

When 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 adjuster 5 is driven under the control of the sequencer to drive the upper half width of the driven gear 4 and the driving gear 3. Engagement (Y2 pattern), drive gear 3 is rotated, and driven gear 4 and driven-side motor 6
The inspection flow of steps P3 to P8 is repeated with the X1 / Y2 pattern with B as the load.

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.

Based on the control of the sequencer, the adjuster 5 is driven to engage the lower gear half width of the driven gear 4 with the driving gear 3, and the driven motor 6B is driven and controlled, and the driving motor 6A is stopped and controlled. The third combination pattern (X2 / Y1 pattern) is set, and the inspection flow similar to that of the second combination pattern (X1 / Y2 pattern) is executed.

In the fourth combination pattern (X2 / Y2 pattern), after the steps P3 to P8 are executed, if 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 is ended.

As described above, in the gear combination inspection method according to the present invention, it is possible to sequentially perform the meshing inspection for all four combination patterns, and to 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.

[0088]

As described above, the gear meshing inspection method according to the present invention is provided with the drive side motor and the driven side motor for independently rotating the drive gear and the driven gear, respectively. Rotation control and stop control of the driven motor to execute the inspection (X
1) and the pattern (X2) that controls the rotation of the driven motor and stops the driving motor to perform the inspection only when the inspection result is determined to be good. Since the motor on the driven side can be used as a load, it is possible to reliably determine a defective gear by reproducing a state close to running of the vehicle.

Further, in the gear meshing inspection method according to the present invention, the pattern (Y1) in which one of the gear half widths of the driven gear is meshed with the drive gear and the inspection is executed, and this inspection result is judged to be good. Only in this case, a pattern (Y2) is provided 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. Therefore, small scratches or dents on the gear end surface that are difficult to detect by central engagement are provided. Can be accurately detected, and good or defective gears can be accurately selected.

Furthermore, four kinds of combination patterns (X1 / Y2) are formed by combining the respective patterns (X1 and X2, Y1 and Y2).
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 the control states of the drive side motor and the driven side motor. Step 2: Set the engagement of the drive gear and the driven gear and rotate the motor. 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.

Therefore, it is possible to provide a gear meshing inspection method for determining a non-defective product or a defective product by reproducing a state close to running of a vehicle and detecting a scratch or a dent on the gear with high sensitivity and high accuracy.

[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 step execution flow chart of a main part of the 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 ... Adjuster, 6A ... Drive side motor,
6B ... driven side motor, 7A, 7B, 8A, 8B ... pulley, 9A, 9B ... 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 integral average value, K _P ... Peak hold / power spectrum value, V _O1 ... Vibration signal.

Claims (3)

[Claims] 1. A gear meshing inspection method for determining a quality by detecting a vibration generated from the 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) for providing an inspection by providing a drive side motor and a driven side motor for independently rotating each of the driven gears, controlling the rotation of the drive side motor, and controlling the stop of the driven side motor. ,
Only when it is determined that the inspection result is good, a pattern (X2) is provided, which controls the rotation of the driven motor and stops the driving motor to perform the inspection. Gear mesh inspection method. 2. In each of the patterns (X1, X2), a pattern (Y1) in which one of the half widths of the driven gear is engaged with the driving gear to perform an inspection, and the inspection result is determined to be good. Only in the case where the driven gear is traversed and the other half of the gear half width is meshed with the drive gear to perform the test (Y2), the gear meshing inspection method. 3. The patterns (X1 and X2, Y1 and Y)
4) combination patterns (X1 / Y1,
X1 / Y2, X2 / Y1, X2 / Y2) is a gear meshing inspection method characterized in that the quality of the pair of gears is determined according to the following steps. Step 1: Set the control states of the drive side motor and the driven side motor. Step 2: Set the engagement of the drive gear and the driven gear and rotate the motor. 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.