JPH10300409A - Gear inspection device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear inspection device and method, using the noncontact type sensor for detecting the deviation, OBD(over ball diameter), and nicks of a gear to be measured for enhancement of measuring accuracy and for simplification of preparations, ensuring judgment on whether or not products are defective, and capable of simplifying nick correction as nick positions are marked and of shortening the measuring time. SOLUTION: A gear 13 to be measured is held in a predetermined position in the main body of a device and meshes with a master gear 4 operated by a cylinder 17. The master gear 4 is rotated by a brake-equipped motor 6, and the movement of the master gear 4 is detected by a noncontact sensor 9. A sequence circuit 11 computes deviation, OBD, and nicks using a predetermined method based on detected values, compares them with respective reference values to determine whether or not the product is defective, and stores the nick positions. Next, as the gear to be measured is rotated, each nick position is marked by a marking means 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an OB of a gear to be measured.
The present invention relates to a gear inspection apparatus and method for measuring the deviation of tooth grooves and dents in a short time to judge the quality of a product and automatically marking a dent position of a gear to be measured which can be corrected.

[0002]

2. Description of the Related Art In general, judgment items for judging the quality of a gear include an OBD (overball diameter) value, tooth groove runout, and presence or absence of a dent. Conventionally, various devices have been disclosed as devices for measuring the quality of the product gear by measuring these factors, and examples thereof include JP-A-3-25335 and JP-A-6-185959.

The "gear engagement test apparatus" disclosed in Japanese Patent Laid-Open Publication No. Hei 3-25335 is a work gear (2) and a master gear (1).
And a change in the center distance between the support shaft (5) of the work support member (4) of the work gear (2) and the master gear support shaft (3) is detected by the center displacement sensor (11).
Based on this output, an abnormality of the work gear (2) is detected. Specifically, a predetermined number of protrusions or recesses are formed in the end face receiving portion of the work support member (4), while detection is performed by an inter-axis displacement sensor. The detected waveform is compared with a waveform pattern based on the convex portion or the concave portion, and abnormality of the tooth surface and the end surface of the work gear (2) is determined by the difference determination.

On the other hand, Japanese Unexamined Patent Publication No. 6-185959 discloses a "shaft-correcting apparatus for geared shaft and a method for manufacturing a geared shaft". Meter (OB
D) and dents are measured, the quality of the shaft with gears is determined based on the measurement results, the distortion of the shaft portion is corrected, and after correction, each measurement is performed again to determine the quality of the product. The purpose is to consolidate the means and to save space and reduce equipment costs.

[0005]

Problems to be Solved by the Invention
In the publication, the quality of the work gear (2) is determined by comparing the waveform pattern based on the convex portion or the concave portion with the waveform pattern based on the detected waveform of the work gear (2) as described above. And there is a problem that the equipment cost becomes large. As shown in FIG. 1, a contact type sensor that directly contacts the master gear (1) is used as the inter-axis displacement sensor (11). Since the contact type sensor wears the contact portion, it is necessary to correct the amount of wear at an appropriate frequency, which is troublesome. In addition, there is a problem that the measurement is liable to be affected by the vibration of the device and accurate measurement cannot be performed. Further, in the case of different types of workpieces, the distance between the axes of the work gear (2) and the master gear (1) changes, so that the setup adjustment of the contact sensor is required, and the operating rate of the apparatus is reduced. Further, this technique can determine the presence or absence of a dent, but does not disclose any marking at the dent position.

On the other hand, Japanese Patent Application Laid-Open No. 6-185959 can accurately judge the distortion of the shaft portion, the runout of the tooth surface, the OBD, and the dent. However, the structure of the apparatus is extremely complicated, and the calculation is difficult. There is a problem that the software of the computer is large and the measurement time is considerably long, resulting in poor measurement efficiency. Naturally, the equipment costs are also high. Further, the device under test is limited to a geared shaft. Further, as in the above-mentioned known technique, there is no disclosure about marking at a position where a dent is generated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and aims at facilitating changeover of a sensor by using a non-contact type sensor, and accurately and accurately detecting OBD, runout, and dents of a gear to be measured. Provided is a gear inspection device and method that can measure in a short time, make the sequence control relatively simple, reduce costs, and perform marking at the dent position to facilitate rework of the dent. The purpose is to do.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a work holding mechanism for detachably supporting a gear to be measured to and from the apparatus main body, and a reciprocating reciprocating mechanism on the apparatus main body. A moving block that pivotally supports a master gear that meshes with the gear to be measured, a driving unit for the moving block, a motor with a brake that rotationally drives the master gear, and movement of the master gear that meshes with the gear to be measured. A non-contact sensor for detecting, a rotational position detecting sensor for detecting a rotational position of the master gear, a marking means for marking a dent position of the gear to be measured, and engaging with the non-contact sensor, In order to determine the quality of the OBD (overball diameter), runout, and dent of the gear to be measured from the calculated value based on the calculated value, and to operate the marking means at the dent position. And it constitutes a gear inspection apparatus and a sequence circuit that is the road form. More specifically, the sequence circuit obtains a shake from a difference between a maximum value and a minimum value of the movement amount of the waveform among the movement amounts of the master gear detected by the non-contact sensor, and the measured OBD value is known. OBD is obtained from the difference between the distance at the time of engagement between the gear and the master gear and the distance at the time of engagement between the gear to be measured and the master gear, and the remaining value obtained by removing the amount of movement of the waveform from the amount of movement of the master gear. And is configured to determine the quality of the product by comparing these calculated values and the reference value, and further, is configured to store the position where the dent is generated, The dent is recognized as a dent only when a similar value of deflection occurs in the same place in the measurement of the gear to be measured in the second rotation of the gear to be measured. At least 2 The measurement of the run-out is completed by rolling, a circuit is formed to control the marking means to mark the dent position in the next third rotation, and the brake of the motor with brake is operated just before the dent position. A circuit is formed to stop the gear to be measured at the dent position.

Also, a work holding mechanism for detachably supporting the gear to be measured on the apparatus main body side, and a movement for pivotally supporting a master gear supported reciprocally on the apparatus main body and meshing with the gear to be measured. A block, driving means for the moving block, a motor with a brake for driving the master gear to rotate, a non-contact sensor for detecting movement of the master gear meshing with the gear to be measured, and a rotational position for detecting a rotational position of the master gear. A detection sensor, a marking means for marking a dent position of the gear to be measured, and a non-contact sensor are engaged, and an OBD (over-ball diameter) and a runout of the gear to be measured are calculated from a calculation value based on the detection signal. A gear inspection device provided with a sequence circuit formed to determine the quality of a dent and to operate the marking means at the dent position A first procedure for setting the gear to be measured on the work holding mechanism, and a second procedure for moving the moving block to the gear to be measured and meshing the master gear with the gear to be measured. , The OBD value is determined by detecting the difference between the distance at the time of engagement between the master gear and the measured gear having a known OBD value and the distance at the time of engagement between the measured gear and the master gear.
A third procedure of judging the quality of the non-defective product and selecting a non-defective product, and driving the motor with a brake to rotate at least the measured gear two times, and detecting the deflection movement of the master gear during that time by the non-contact sensor, A fourth procedure for obtaining the runout of the measured gear from the difference between the maximum value and the minimum value of the runout, determining the quality of the runout and selecting a non-defective product, and removing the runout of the selected non-defective product by a frequency filter, A fifth procedure for determining the value of the remaining run-out and setting a dent when the value of the run-out repeatedly occurs in the same place, and the position of the dent while rotating the measured gear capable of correcting the dent. And a sixth step of marking the gear to be measured by stopping the gear to be measured each time. Further, when the number of teeth of the master gear is larger than the number of teeth of the gear to be measured, the measurement is performed by rotating the master gear at least once.

[0010] The master gear and the gear to be measured are meshed with the master gear and the gear to be measured, in which the values of the runout and the OBD are formed at the non-defective level, and in principle, the master gear is rotated by a motor with a brake, and at least the gear to be measured is rotated twice. In the meantime, the movement amount of the master gear moving due to the accuracy of the measured gear is detected by the non-contact sensor engaged with the master gear. When this detection signal is input to the sequence circuit,
Calculations relating to predetermined shake, OBD, and dents are performed. Comparison with the reference value is performed. As for the deflection and OBD, those exceeding the reference value are defective, but the dents are corrected to be non-defective. In order to facilitate this correction, the dent generation position is marked. In order to set the marking means correctly at the dent position, the brake is operated by the motor with brake before the dent position, and the response delay of the sequence circuit is complemented to set the marking means at the correct dent position. ing.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the gear inspection apparatus and method according to the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a schematic structure of a gear inspection device of the present invention. Gear inspection device 1
Are roughly divided into a base table 2 which is a main body side of the apparatus, a moving block 3 supported on the base table 2 so as to be able to reciprocate along the direction of arrow A, and pivotally supported by the moving block 3, and A rotating shaft 5 for fixing the master gear 4; a motor 6 with a brake for driving the rotating shaft 5; a driving means 7 for moving the moving block 3 in the direction of arrow A;
A work holding mechanism 8 pivotally supporting the base gear 2, a non-contact sensor 9 for detecting the movement of the master gear 4 meshing with the measured gear 13, a sequence circuit 11 for performing sequence control of the entire apparatus, And marking means 10 for marking the dent position.

The master gear 4 is a gear having an OBD and a runout formed to a reference value, and in principle has no dent. The motor 6 with a brake that rotationally drives the master gear 4 via the rotary shaft 5 drives the master gear 4 to rotate and accurately stops at a desired position. Since the motor is stopped after a predetermined time from the brake operation, By performing the brake operation earlier by the delay time, the motor stop position can be accurately positioned at a desired stop position. The master gear 4 is provided with a rotational position detection sensor 12 (FIG. 2). Although a device for detecting one rotation of the master gear 4 is provided in the drawing, the invention is not limited to this.

The driving means 7 comprises a shaft 16 having one end connected to a bearing holder 14 for pivotally supporting the rotating shaft 5 of the master gear 4 and the other end connected to the floating joint 15, and a cylinder 17 fixed to the base 2 side. And floating joint 15
And a rod 18 erected between them. The rod 18 is slidably supported by a guide plate 19 fixed to the moving block 3. A stopper member 20 is fixed to the rod 18, and the floating joint 15 and the guide plate 19
A spring 21 is interposed between them. The spring 21 acts to urge the master gear 4 in a direction in which the master gear 4 is pressed against the measured gear 13.

The non-contact sensor 9 includes a sensor main body 9a fixed to the base 2 side, a block plate 22 fixed to the moving block 3 side and the like so as to always keep an appropriate gap in the sensor main body 9a. The rotation position detection sensor 12 for detecting the rotation of the master gear 4 includes a fixed block 23 fixed to the master gear 4 and a non-contact sensor unit 24 disposed opposite to the fixed block 23 and fixed to the moving block 3 side. Consists of

The work holding mechanism 8 includes a collet-type expansion drawbar 25 for fixedly holding the gear 13 to be measured, a pivotal support 26, an air cylinder 27 for operating the collet-type expansion drawbar 25, and air to the air cylinder 27. And a rotary joint 28 for sending and receiving.

The marking means 10 includes a point marker section 10a disposed close to the teeth of the gear 13 to be measured,
A main body 10b that supplies ink to the point marker section 10a to perform sealing, and moves the same up and down;
It is connected to the sequence circuit 11.

With the above structure, by operating the cylinder 17 of the driving means 7, the rod 18 advances, and the stopper member 20 contacts the guide plate 19. Thereby, the moving block 3 moves forward, and the master gear 4 meshes with the measured gear 13. In this state, the sensor body 9a of the non-contact sensor 9
And the block plate 22 are opposed to each other with a minute gap therebetween.
3 is arranged at a position facing the non-contact sensor unit 24.

Here, by rotating the motor with brake 6, the master gear 4 rotates, and the measured gear 13 meshing with the master gear 4 also rotates. If the measured gear 13 has a run-out, the master gear 4 reciprocates with the rotation of the measured gear 13, and the value of the gap of the non-contact sensor 9 changes. Thus, it is detected that the measured gear 13 has run-out.
If there is a dent in the measured gear 13, the master gear 4 swings at the position of the dent and the dent is detected. On the other hand, one rotation of the master gear 4 can be confirmed by the non-contact sensor unit 24 and the fixed block 23. As will be described later, the measurement of the runout and dent of the measured gear 13 is performed by rotating the measured gear 13 twice in order to detect these measured values with high accuracy. In addition, regardless of the ratio of the number of teeth between the master gear 4 and the gear to be measured 13, the dent measurement is performed by rotating the master gear 4 at least once to improve the dent measurement accuracy.

FIGS. 3 and 4 are schematic diagrams showing a method for obtaining the OBD. First, a known measured gear 13a of the OBD
And the master gear 4 are engaged with each other, and the distance a
Is detected. Next, the measured gear 13 and the measured gear 13a to be measured are exchanged with the fixed point O coincident, the measured gear 13 and the master gear 4 are meshed, and the distance b is determined by the contact sensor 9. The OBD can be obtained from the difference between a and b.

FIG. 5 shows a sequence circuit 11 for detecting runout and dents.
FIG. 3 is a diagram for simply explaining a base for calculating by using FIG. As shown in FIG. 5A, the waveform detected by the non-contact sensor 9 is a waveform like a B curve. If there is a dent, the portion undulates excessively by the amount of the dent, so that a protruding run 29 is generated in a part of the waveform as shown. In this waveform, the runout of the measured gear 13 is determined by the illustrated dimension c of the difference between the maximum value and the minimum value of the waveform of the B curve. On the other hand, a dent is considered to have a dent if the size d of the protruding runout 29 is larger than the set level shown in FIG. 5B, but the protruding runout remains in the state of FIG. It is difficult to accurately determine the dimension d of 29. Therefore, FIG. 5A is arranged through a frequency filter for eliminating a waveform. As a result, FIG.
As shown in (b), only the protruding run-out 29 can be closed up, and the occurrence of a dent larger than the set level and the location of the occurrence can be detected.

Next, a method of inspecting the OBD of the measured gear 13 by the gear inspection apparatus 1 of the present invention will be described with reference to the flowcharts of FIGS. First, the measured gear 13a whose OBD has been measured is fixed at a fixed position (step 1).
00), and the master gear 4 is meshed with this (step 10).
1) The distance a is obtained (step 102). The measured gear 13 whose OBD is unknown is fixed at the fixed position (step 1).
03), mesh with the master gear 4 (step 104),
The distance b is obtained (step 105). a and b are compared to determine the quality of the measured gear 13 (step 10).
6). Defective products are discarded (step 107), and non-defective products proceed to measurement of runout and dents (step 108).

Next, a method of inspecting runout and dents of the measured gear 13 by the gear inspection apparatus 1 of the present invention will be described with reference to the flowchart of FIG. First, the measured gear 13 is fixed at a predetermined position on the base 2 by the work holding mechanism 8 (step 200). Next, the master gear 4 is moved by the driving means 7 (step 201), and the measured gear 13 and the master gear 4 are meshed (step 202). The motor 6 with the brake is activated (203), and the non-contact sensor 9 is activated.
To detect the movement of the master gear 4 (step 20).
4). A predetermined operation is performed by the sequence circuit 11 based on the detected value (step 205), and a shake is obtained (step 206). Next, these calculated values are compared with a reference value,
The quality of the product is determined (step 207). Those whose run-out exceeds the reference value are discarded as defective products (step 208). The shake waveform of the measured gear 13 that has passed the shake is removed by a frequency filter (step 209), and the position of the dent is detected (step 210). It is detected whether or not the dent position measured by the second rotation coincides with the first rotation (step 211), and if Yes (if coincident), the dent is detected (step 212). No (if they do not match) is not a dent (step 213). A dent that exceeds the reference value is selected as a dent defect (step 214), and marking is performed at the dent position (step 215). Next, the dent at the marking position is corrected (step 21).
6). As described above, good products can be selected or reworked.

Next, a calculation and control method by the sequence circuit 11 will be described with reference to a block diagram of FIG. First,
According to the method described above, the OBD measuring unit 30 determines whether the OBD of the measured gear 13 is acceptable (OK) or rejected (NG), the NG measured gear 13 is discarded, and the OK gear is the shake measuring unit 31 side. Sent to Next, a displacement waveform is obtained by the non-contact sensor 9 as described above, and a pass (OK) or reject (NG) of the shake is determined by the shake measuring unit 31 of the sequence circuit 11. The NG measured gear 13 is discarded, and the OK gear is sent to the dent detection side. The measured gear 13 sent to the dent detecting side has its run-out waveform removed by the frequency filter 32, and the dent is detected by the above-described method, and the presence or absence of the dent is determined. Those having nothing are products as they are, and those having nos are subjected to dent correction by the above-mentioned method to be products.

Next, the marking at the dent position will be described with reference to the flowchart of FIG. The dent position is detected and stored in advance by the sequence circuit 11 (step 30).
0). Next, the master gear 4 is rotated to rotate the measured gear 13 at least one time. During the rotation, a dent position is detected (step 301), and the brake of the motor with brake 6 is released before the position corresponding to the dent position. Operate (step 302). By operating the brake in front, the response delay is canceled, and the measured gear 13 stops at a predetermined dent position (step 303). At this point, the marking means is operated to perform marking on the tooth surface of the measured gear 13 with the dent (step 304). Next, the measured gear 13
It is confirmed whether or not has rotated once (step 305), and Ye
In the case of s (one rotation), the marking operation is completed and N
In the case of o, the process returns to step 302 and the same steps are performed.

As described above, the inspection of the gear 13 to be measured by the gear inspection device 1 of the present invention is performed to surely detect the runout and the dent of the gear 13 to be measured while the gear 13 is rotated twice, and is extremely measured. Time is short. Further, since a non-contact type sensor is used, errors due to wear of the sensor and the like are small.
Further, the dent position is stored, and marking is performed at the dent position during the next one rotation of the measured gear 13, so that the marking operation is performed in a short time. Further, since the dent position is marked, the dent can be easily reworked. One rotation of the master gear 4 is reliably detected by the rotation position detection sensor 12. The reason why the master gear 4 is rotated at least once without being limited to the gear ratio with the gear to be measured 13 is to prevent dust or the like from being mistakenly recognized as a dent when the master gear 4 is erroneously attached. . Therefore, when the number of teeth of the measured gear 13 is less than half the number of teeth of the master gear 4, the measurement of the measured gear 13 according to the present invention is performed by the master gear 4.
Needs to make at least one rotation, the measured gear 13 is
It is desirable to perform the measurement by rotating the rotation more than the rotation. On the other hand, the reason why the spring 21 is used in the gear inspection device 1 shown in FIG. 1 is to apply a predetermined pressing force between the measured gear 13 and the master gear 4 so as to further ensure the meshing between them. is there. Further, the device structure shown in FIG. 1 shows a schematic structure as described above, and a known technology is applied to a detailed structure, and the structure is not limited to the illustrated structure.

[0026]

【The invention's effect】

1) According to the gear inspection device according to claim 1 of the present invention,
Since non-contact sensors are used to detect run-out, OBD, and dents of the gear to be measured, there is no error due to sensor wear, high-precision detection is possible, and setup change even when the type of gear to be measured changes. And the operation rate of the apparatus can be improved. In addition, a product whose run-out or OBD is out of the reference value is removed, so that the product is reliably sorted. In addition, since the position of a dent that is equal to or greater than the set level is marked, the dent is corrected very easily. 2) According to the gear inspection device described in claim 2 of the present invention,
The measurement is performed in a short time because the sequence circuit is configured to detect the swing and the dent during the two rotations of the gear to be measured. Thereby, the measurement efficiency can be improved. Further, the configuration of the sequence circuit may be relatively simple, and can be implemented at low cost. 3) According to the gear inspection device according to claim 3 of the present invention,
The dent position is detected and stored in advance, and the gear to be measured is positioned and stopped at each dent position at the next third rotation after the measurement is completed by two rotations of the gear to be measured. The mark detection is performed in a short time, and the position of the dent is clarified. Thereby, the dent correction is easily performed. 4) According to the gear inspection method according to claim 4 of the present invention,
The measurement of the OBD, runout, and dent of the gear to be measured is sequentially and accurately performed in a short time according to the configuration of the sequence circuit, and the determination of the quality is also reliably performed. Marking of the mark position is performed reliably. As described above, it is possible to shorten the measurement time and the dent correction time. 5) According to the gear inspection method according to claim 5 of the present invention,
Since the measurement of the gear to be measured is performed by rotating the master gear at least one rotation regardless of the gear ratio of the master gear and the gear to be measured, erroneous recognition of dent detection based on the cause of dust or the like attached to the master gear is prevented, and accurate Trace detection is performed.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a schematic structure of a gear inspection device of the present invention.

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a schematic diagram for explaining a method of measuring an OBD by the gear inspection device of the present invention.

FIG. 4 is a schematic diagram for explaining a method of measuring an OBD by the gear inspection device of the present invention.

FIG. 5 is a diagram for explaining a base for calculating runout and dents according to the present invention.

FIG. 6 shows the OB of the gear to be measured by the gear inspection device of the present invention.
5 is a flowchart for explaining a method of measuring D.

FIG. 7 is a flowchart for explaining a method of measuring runout and dent of a gear to be measured by the gear inspection device of the present invention.

FIG. 8 is a block diagram for explaining a configuration of a sequence circuit of the gear inspection device of the present invention.

FIG. 9 is a flowchart for explaining a marking method of the gear inspection device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gear inspection apparatus 2 Base stand 3 Moving block 4 Master gear 5 Rotating shaft 6 Motor with brake 7 Driving means 8 Work holding mechanism 9 Non-contact sensor 9a Sensor main body 10 Marking means 10a Point marker section 10b Main body 11 Sequence circuit 12 Rotational position detection Sensor 13 Measured gear 13a Measured gear (OBD known) 14 Bearing holder 15 Floating joint 16 Shaft 17 Cylinder 18 Rod 19 Guide plate 20 Stopper member 21 Spring 22 Block plate 23 Fixed block 24 Non-contact sensor part 25 Collet type expansion Drawbar 26 Pivot 27 Air cylinder 28 Rotary joint 29 Protruding runout 30 OBD measuring unit 31 Runout measuring unit 32 Frequency filter

 ──────────────────────────────────────────────────の Continued on the front page (72) Naotoshi Tsutsumi, Inventor No. 8 Tsuchiya, Fujisawa City, Kanagawa Prefecture Isuzu Motors Fujisawa Plant

Claims (5)

[Claims] 1. A work holding mechanism for detachably supporting a gear to be measured on an apparatus main body side, and a movement for supporting a master gear meshing with the gear to be measured reciprocally supported on the apparatus main body. A block, driving means for the moving block, a motor with a brake for driving the master gear to rotate, a non-contact sensor for detecting movement of the master gear meshing with the gear to be measured, and a rotational position for detecting a rotational position of the master gear. A detection sensor, a marking means for marking a dent position of the gear to be measured, and a non-contact sensor are engaged, and an OBD (over-ball diameter) and a runout of the gear to be measured are calculated from a calculation value based on the detection signal. And a sequence circuit formed to determine the quality of the dent and to operate the marking means at the position of the dent. Gear inspection device. 2. The method according to claim 1, wherein the sequence circuit obtains a shake from a difference between a maximum value and a minimum value of a waveform movement amount among movement amounts of the master gear detected by the non-contact sensor.
The OBD is obtained from the difference between the meshing distance between the measured gear and the master gear having a known BD value and the meshing distance between the measured gear and the master gear to be measured, and the movement of the waveform is calculated from the movement amount of the master gear. The dent is determined from the remaining value after removing the amount, and the calculated value is compared with a reference value to determine the quality of the product, and the position where the dent is generated is stored. The dent is recognized as a dent only when the same runout of the same value occurs in the same place even in the measurement of the second rotation of the gear to be measured. Item 2. The gear inspection device according to Item 1. 3. The sequence circuit completes the measurement of the run-out by at least two rotations of the gear to be measured.
A circuit is formed to control the marking means to mark the dent position at the rotation eye, and the brake of the motor with brake is operated just before the dent position to stop the gear to be measured at the dent position. The gear inspection device according to claim 2, wherein a circuit is formed. 4. A work holding mechanism for detachably supporting a gear to be measured on the apparatus main body side, and a movement for pivotally supporting a master gear supported reciprocally on the apparatus main body and meshing with the gear to be measured. A block, driving means for the moving block, a motor with a brake for driving the master gear to rotate, a non-contact sensor for detecting movement of the master gear meshing with the gear to be measured, and a rotational position for detecting a rotational position of the master gear. A detection sensor, a marking means for marking a dent position of the gear to be measured, and a non-contact sensor are engaged, and an OBD (over-ball diameter) and a runout of the gear to be measured are calculated from a calculation value based on the detection signal. A gear testing device provided with a sequence circuit formed to determine the quality of the dent and to operate the marking means at the dent position. An inspection method, a first procedure of setting a measured gear to the work holding mechanism, a second procedure of moving the moving block to the measured gear side and meshing the master gear and the measured gear, The OBD value is determined by detecting the difference between the distance at the time of engagement between the master gear and the measured gear having a known OBD value and the distance at the time of engagement between the master gear and the measured gear to be measured. A third procedure of judging pass / fail and selecting a non-defective product;
The non-contact sensor detects the movement of the master gear during the rotation, determines the deflection of the gear to be measured from the difference between the maximum value and the minimum value of the deflection, and determines the quality of the deflection to select a non-defective product. Fourth procedure, the vibration of the selected non-defective product is removed by a frequency filter, and the value of the remaining vibration is obtained.
A fifth procedure for making a dent when the value of this runout repeatedly occurs at the same place, and stopping the gear to be measured at the dent position each time while rotating the gear to be dent-correctable. And performing a marking on the gear to be measured. 5. When the number of teeth of the master gear is larger than the number of teeth of the gear to be measured, at least one master gear is set.
The gear inspection method according to claim 4, wherein the measurement is performed by rotating the gear.