JP3398205B2 - A method for detecting dents on the tooth surface by a single tooth meshing type gear test - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a dent on a tooth surface of a gear by a one tooth surface meshing type gear test.

[0002]

2. Description of the Related Art In recent years, for example, in the technical field of automobiles, reduction of vehicle interior noise has been demanded as a part of improvement of amenity in a vehicle interior. As one of the causes of such in-vehicle noise that obstructs amenities in the vehicle interior, it is based on gear dents in transmissions that have not been a problem until now because other in-vehicle noise has been reduced. A little noise is emerging. As a result,
In the manufacturing process of gears, it is required to carry out a gear test for inspecting the generation state of dents.

Generally, as a gear test method which is relatively inexpensive and suitable for mass production, a two-tooth surface meshing test method is often used. In this two-tooth surface meshing test method,
Conventionally, the number of teeth of the master gear and the number of teeth of the test gear are simply set in mutually different states, and one tooth of the test gear is interposed between adjacent teeth of the master gear,
While maintaining the meshed state (that is, the meshing state of the two tooth surfaces) in which both tooth surfaces of the gear of the test gear are pressed against the tooth surfaces of the pair of teeth of the master gear which face each other, respectively, In the state in which there is no interlocking state, the O. B. D.
(Overball diagram), the amount of eccentricity, and the target dent, etc. were analyzed and acquired.

More specifically, when detecting a dent, the master gear and the test gear are rotated with each other in a non-backlash two-tooth surface meshing state, and the center of each of the master gear and the test gear is rotated during this rotation. The distance between them is measured, and the abrupt change part of this measurement result (in other words, the part that exceeds a predetermined level in the meshing error of one tooth) is regarded as a dent and the dent amount is expressed for convenience. I've been

[0005]

However, in such a conventional two-tooth surface meshing type gear testing method, the actual height from the dent bottom to the dent top is increased vertically from the center axis of both gears. It is impossible to measure the size (that is, the size of the dents), and it was not possible to judge whether the detected dents are minor and do not require correction, or whether they are minor and need correction. . Specifically, the dents are detected as changes in the center-to-center distance in the axial direction, and this center-to-center difference is determined by external factors such as workpiece specifications (twist angle, pressure angle, dislocation coefficient, etc.) and dent positions. Since the distance changes, it is very difficult to perform the replacement calculation to grasp the dent as the height of the scratch from the change in the center-to-center distance.

Further, the meshing state in the no-backlash state, which is equivalent to the two-tooth-face meshing gear test method, is not used except for some special gears, and is changed to the actual gear meshing state. If you think about it, there is a risk that a scratch that is not related to the dent may be judged as a dent, or that a dent or a profile error that is problematic in practical use may be underestimated. There has been a demand for detection of dent marks.

Further, in the conventional hit detection, in order to improve the accuracy of detection, both of them are repeatedly operated many times, for example, several minutes in time with the gear to be inspected meshed with the master gear. Since the information obtained by rotationally driving was statistically processed, if an attempt was made to incorporate such a system for detecting a dent into a gear manufacturing line, the line would substantially stop at the dent detection. In this case, productivity is extremely deteriorated, and improvement has been demanded also from this viewpoint.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a tooth flank capable of detecting a dent formed on the tooth flank of a gear to be tested within a short time. It is intended to provide a method for detecting a dent mark on a tooth surface by a meshing type gear test.

Another object of the present invention is to provide a tooth flank dent detection method by a one tooth surface meshing type gear test capable of calculating the height of the dent formed on the gear to be tested. Is.

[0010]

In order to solve the above-mentioned problems and to achieve the object, a method for detecting a dent mark on a tooth surface by a one-tooth-face meshing type gear test according to the present invention is defined in claim 1. For example, the number of teeth of the master gear and the number of teeth of the test gear are set to be the same, and the master gear having the number of teeth set in this manner and the test gear are in one tooth surface meshing state, and a predetermined number of teeth. Rotate at least one rotation by running the rotation torque, precisely measure the rotation amount of both at this rotation with a predetermined resolution, and calculate the number of surplus pulses from the difference between the measured values of the master gear and the test gear. A dent formed on the tooth surface of the test gear is detected based on the calculated surplus pulse.

According to a second aspect of the present invention, in the tooth flank dent detection method by the one tooth flank meshing gear test according to the present invention, according to the second aspect of the present invention, the dents are calculated from the calculated number of surplus pulses. It is characterized by calculating the height of.

Further, according to the present invention, in the method for detecting the dent mark on the tooth flank by the one tooth flank meshing type gear test, according to claim 3, the master gear and the test gear are rotated once. The feature is that the dent is detected.

According to a fourth aspect of the present invention, in the tooth flank dent detection method based on the one tooth flank meshing gear test, the master gear is set in a direction opposite to the rotational direction of the test gear. Direction is rotationally driven with a torque larger than the predetermined torque, one tooth surface of each tooth of the test gear is brought into contact with the master gear, and a dent on the one tooth surface is detected. I am trying.

According to the fifth aspect of the present invention, in the tooth flank dent detection method by the one tooth flank meshing gear test, according to the fifth aspect, the test gear is rotated in the direction of rotation when it is used. Is rotationally driven in the same direction with a predetermined torque, the master gear in the opposite direction to the rotational direction of the test gear,
It is characterized in that it is rotationally driven with a torque smaller than the predetermined torque to bring the other tooth surface of each tooth of the test gear into contact with the master gear and detect a dent on the other tooth surface.

According to a sixth aspect of the present invention, in the tooth flank dent detection method by the one tooth flank meshing type gear test, the master gear is a test gear meshed with the master gear. And is rotationally driven with a predetermined torque in a direction opposite to the rotational direction when the gear is inspected, and the gear to be tested is rotationally driven with a torque larger than the predetermined torque in the same direction as the rotational direction when the gear is used. One feature is that one tooth surface of each tooth of the test gear is brought into contact with the master gear, and a dent on the one tooth surface is detected.

According to a seventh aspect of the present invention, in the tooth flank dent detection method by the one tooth flank meshing type gear test, the master gear is a test gear meshed with the master gear. And rotationally driving the test gear in a direction opposite to the rotational direction at the time of rotation, in the same direction as the rotational direction when the gear is used, at a torque smaller than the predetermined torque, One feature is that one tooth surface of each tooth of the test gear is brought into contact with the master gear, and a dent on the one tooth surface is detected.

According to the eighth aspect of the present invention, in the tooth flank dent detection method by the one tooth flank meshing gear test, the rotation axis of the master gear and the rotation axis of the gear to be tested are described. The feature is that the separation distance between and is kept constant.

According to the eighth aspect of the present invention, in the tooth flank dent detection method by the one tooth flank meshing gear test, the detected dent information is displayed. There is.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tooth flank dent detection method by a one tooth flank meshing gear test according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an outline of a detection apparatus 10 to which a method for detecting a dent mark on a tooth surface by a one tooth surface meshing type gear test according to an embodiment of the present invention is applied. First, the configuration of the detection device 10 will be briefly described.

In the detection device 10, the first drive system 14 for rotating the test gear 12 with a predetermined torque and the master gear 16 meshing with the test gear 12 rotate the test gear 12 described above. Second drive system 18 for rotating with a torque larger or smaller than a predetermined torque of
And a detection system 20 for detecting dents on the gear 12 to be inspected. Here, this first drive system 14
The test gear 12 has a first drive shaft 22 coaxially attached to one end thereof, a first bearing block 24 for rotatably supporting the first drive shaft 22, and the first drive shaft 22. And a first drive mechanism 26 for rotationally driving. In addition, the second drive system 18 is the first drive system 14
Similarly, the second drive shaft 28 to which the master gear 16 is coaxially attached at one end, and the second bearing block 30 for rotatably supporting the second drive shaft 28,
A second drive mechanism 32 for rotationally driving the second drive shaft 28 is provided.

The above-mentioned first drive mechanism 26 has an inverter motor as the first drive motor 34 and a first drive shaft coaxially fixed to the drive shaft of the first drive motor 34.
Drive pulley 36, a first driven pulley 38 fixed to the other end of the first drive shaft 22, and a first endless belt wound around the first drive pulley 36 and the first driven pulley 38. And 40. On the other hand, the above-described second drive mechanism 32 includes an inverter motor as the second drive motor 42, a second drive pulley 44 coaxially fixed to the drive shaft of the second drive motor 42, and a second drive pulley 44. A second driven pulley 46 fixed to the other end of the drive shaft 28 of
It is composed of a second drive pulley 44 and a second endless belt 48 that is stretched around a second driven pulley 46.

Here, for the detection operation described later, in this embodiment, the number of teeth of the master gear 16 and the number of teeth of the test gear 12 are set to be the same. Further, both the first drive shaft 22 and the second drive shaft 28 are arranged with their center positions fixed. In other words, in this embodiment, the center-to-center distance between the first drive shaft 22 and the second drive shaft 28 is set to a fixed value.

On the other hand, the detection system 20 described above determines the rotation amount (angle) of the first drive shaft 22 with a predetermined precision, for example,
The first detection encoder 50 having a resolution of 2304000 pulses / rotation in this embodiment, and the second
The amount of rotation (angle) of the drive shaft 28 is set to a predetermined precision, for example, 230400 as the resolution in this embodiment.
Second encoder 52 for detection with 0 pulses / revolution
And the detection signals of both encoders 50 and 52 are input together, a comparison calculation unit 54 that compares and calculates both, and a dent detection unit 56 that detects a dent based on the calculation result from the comparison calculation unit 54. The display unit 58 displays the dent information detected by the dent detection unit 56.

Although not shown in detail, the first detection encoder 50 is fixed to the first drive shaft 22,
A pulse disk formed to have a sine wave output of 4500 pulses / rotation, a photoreflector using a laser beam, and an output signal from the photoreflector
(= 2 ⁹ ) times, and a multiplication unit for performing vector multiplication. In this way, the first detection encoder 50
Has been configured, so from now on, 1
A rotation detection signal of 2304000 pulses is output. Similarly, the second detection encoder 52
Although not shown in detail, is a pulse disk fixed to the second drive shaft 28 and formed to have a sine wave output of 4500 pulses / rotation, a photoreflector using a laser beam, The output signal from the photoreflector is provided with a multiplication unit for multiplying the output signal by 512 (= 2 ⁹ ) times. Since the second detection encoder 52 is configured in this way, a detection signal of 2304000 pulses will be output per rotation of the master gear 16 from now on.

Next, the detection device 10 configured as described above.
The detection operation for detecting the dent formed on the tooth surface of the test gear 12 by the dent detection unit 56 will be described in detail with reference to FIG.

First, the number of teeth of the master gear 16 and the number of teeth of the test gear 12 are set to be the same, and the drive torque applied to the first drive shaft 22 by the first drive mechanism 26 is set to 6 for example.
The gear 12 to be inspected as kgm is rotated in the same direction as the rotation direction when the gear 12 is actually mounted and used in the device (for example,
Drive clockwise. On the other hand, the second drive mechanism 32
Thus, the drive torque applied to the second drive shaft 28 is set to, for example, 4 kgm, and the master gear 16 is rotationally driven in a direction (eg, counterclockwise direction) opposite to the rotational direction of the test gear 12 meshed with the master gear 16. As a result, the tooth faces on the clockwise side of each tooth of the test gear 12 and the tooth faces on the clockwise side of the corresponding teeth of the master gear 16 come into contact with each other. In other words, the tooth surface on the clockwise side of each tooth of the test gear 12 is detected by the master gear 16.

In such a rotating state, when the master gear 16 is rotated by an angle of θa = 1.00 degrees, ideally, the test gear 12 is also rotated by an angle of θb = 1.
It will rotate only 00 degrees. However, since a transmission error has actually occurred, θa≈θb. On the other hand, when the master gear 16 makes one rotation (360 degrees), the test gear 12 also makes one rotation (360 degrees),
It will return to the original contact position. That is, the angle deviation that occurs during rotation is 3 when the rotation start time is "0".
It will return to "0" again when it rotates 60 degrees. Such a fluctuation component of the rotation deviation is pseudo-expressed as a sine curve as shown in FIG.

The fluctuation component of the angular deviation represented by this waveform is called a cumulative pitch error, and in the case of an automobile, it mainly contributes to the in-vehicle noise as low frequency noise of 100 Hz or less. That is, when the rotation speed of the gear is 3000 rpm, 3000/60 = 50 (Hz).

On the other hand, in detecting a dent on the tooth surface of each tooth of the gear to be tested 12 on the clockwise side, assuming that the pitch circle diameters (R) of the master gear 16 and the gear to be tested 12 are 100 mm, respectively. The number of surplus pulses, which is the difference between the output pulses of the encoders 50 and 52, can be expressed as it is as an angle deviation. This will be described in detail below.

That is, the actual change in the number of surplus pulses as the difference between the output pulses of the two encoders 50 and 52 appears as shown in FIG. Here, the pitch circumference length (L) of each of the master gear 16 and the test gear 12 = πR = 314
mm. As a result, the circumferential length of the pitch circle per pulse is L / 2,304,000 = 0.000136m.
It becomes m = 0.136 μm. In other words, the angular deviation represented by one extra pulse is 0.314 μm. As a result, assuming that the sudden change in the number of surplus pulses is 100 pulses in the comparison calculation unit 54, the angular deviation in this case is 0.136 × 100 in the dent detection unit 56.
= 13.6 μm. In this way
In the dent detection unit 56, the contact angular position of the gear 12 to be inspected with the master gear 16 is 13.6 μm from the true angular position.
You can see that you are either ahead or behind by m. Therefore, the height of the dent detected by the occurrence of the sudden surplus pulse is calculated straight as 13.6 μm. Such dent detection information is displayed on the display unit 58 such as a CRT, for example.

Further, by differentiating the change in the number of surplus pulses, the angular velocity ω (= Δ in the rotation of the gear 12 under test)
θb / Δt rad / sec, where t is time), and by further differentiating this angular velocity ω, the angular acceleration ω ′ (= Δω / Δt rad / sec ² ) can be obtained. It will be a matter. By thus obtaining the angular velocity ω and the angular acceleration ω ′, it is possible to directly obtain the magnitude of the meshing fluctuation that directly affects the driving noise.

On the other hand, when the counterclockwise tooth surface of each tooth of the gear 12 to be inspected is to be inspected, the gear 12 to be inspected and the master gear 16 are kept attached to the respective drive shafts 22 and 28. The first drive mechanism 26 keeps the first
The drive torque applied to the drive shaft 22 of the
As a result, the test gear 12 is maintained in a state of being rotationally driven in the same direction (for example, clockwise direction) as the rotation direction when the gear 12 is actually mounted and used in the apparatus. On the other hand, the drive torque applied to the second drive shaft 28 by the second drive mechanism 32 is set to, for example, 8 kgm, and the master gear 16 is rotated in a direction opposite to the rotation direction of the test gear 12 that meshes with the master gear 16 (for example,
Drive counterclockwise). As a result, the test gear 12
The tooth surface on the counterclockwise side of each tooth and the tooth surface on the counterclockwise side of the corresponding tooth of the master gear 16 come into contact with each other. In other words, the counterclockwise tooth surface of each tooth of the test gear 12 is detected by the master gear 16.

As described above in detail, in this embodiment, the distance between the center of rotation of the master gear 16 and the center of rotation of the gear 12 to be inspected is set to a predetermined value, and a predetermined back gear is set. Since the master gear 16 is rotationally driven by applying a predetermined torque (load) in a state in which the two are meshed with each other with a lash, the test gear 12 is in a state substantially similar to the actual mounted state. It will be possible to inspect the dents while also considering the distortion and bending of the teeth. As a result, it is possible to accurately detect and measure the position and the height (amount) of the dent that causes the transmission error of the tooth that constitutes the driving noise that is one of the factors that obstruct the amenity in the vehicle interior. Therefore, it is possible to surely determine from the dent information displayed on the display unit 58 whether the occurrence of dents in the tested gear 12 that is tested requires correction or is not necessary.

As described above, according to this embodiment, in consideration of the actual gear meshing state, a flaw unrelated to the dent may be determined to be a dent, and a practical use may occur. In this state, there is no risk of underestimating a problematic dent or profile mistake, and more reliable dent detection can be achieved.

In this embodiment, the gear to be tested 12 can be tested and the state of dents can be detected by rotating the master gear 16 once. Even if each of the manufactured gears is inspected by using this dent detection device 10, the time required for this inspection is extremely short, and the operation is performed without any hindrance to the productivity. It is possible to reliably detect a dent that causes noise and in a short time.

It is needless to say that the present invention is not limited to the configuration of the above-described embodiment and can be variously modified without departing from the gist of the present invention.

For example, in the above-mentioned embodiment, the dent formed on the tooth surface of the gear 12 to be detected is detected by rotating the master gear 16 and the gear 12 to be inspected 12 once while engaging with each other. However, the present invention is not limited to such a configuration, and may be configured to detect a dent by rotating the both a few times, for example, to the extent that productivity is not hindered. good.

Further, in the above-described embodiment, the torque applied to the first drive shaft 22 to which the test gear 12 is attached is constant, and the torque is applied to the second drive shaft 28 to which the master gear 16 is attached. Although it has been described that the applied torque is variable, the present invention is not limited to such an aspect, the torque applied to the second drive shaft 28 to which the master gear 16 is attached is constant, and the test is performed. Gear 12
The torque applied to the first drive shaft 22 to which is attached may be variable.

[0040]

As described in detail above, the method for detecting the dent mark on the tooth surface by the one tooth surface meshing type gear test according to the present invention, according to the first aspect of the present invention, includes the number of teeth of the master gear and The number of teeth of the test gear is set to be the same, and the master gear having the number of teeth set in this way and the test gear are in one tooth surface meshing state, and are rotated at least one revolution by running a predetermined rotational torque. , The amount of rotation of both in this rotation, each accurately measured with a predetermined resolution, calculate the number of surplus pulses from the difference between both measured values of the master gear and the test gear, based on the calculated surplus pulse, It is characterized in that a dent formed on the tooth surface of the test gear is detected.

According to a second aspect of the present invention, in the tooth flank dent detection method by the one tooth flank meshing gear test according to the present invention, according to the description of claim 2, the dents are calculated from the calculated number of surplus pulses. It is characterized by calculating the height of.

Further, according to the method for detecting the dent mark on the tooth surface by the one tooth surface meshing type gear test according to the present invention, according to the third aspect, the master gear and the test gear are rotated once. The feature is that the dent is detected.

According to a fourth aspect of the present invention, in the tooth flank dent detection method by the one tooth flank meshing type gear test, the master gear is set in a direction opposite to the rotation direction of the test gear. Direction is rotationally driven with a torque larger than the predetermined torque, one tooth surface of each tooth of the test gear is brought into contact with the master gear, and a dent on the one tooth surface is detected. I am trying.

According to the fifth aspect of the present invention, in the tooth flank dent detection method by the one tooth flank meshing gear test, according to the fifth aspect of the invention, the gear to be inspected is rotated in the direction of rotation when it is used. Is rotationally driven in the same direction with a predetermined torque, the master gear in the opposite direction to the rotational direction of the test gear,
It is characterized in that it is rotationally driven with a torque smaller than the predetermined torque to bring the other tooth surface of each tooth of the test gear into contact with the master gear and detect a dent on the other tooth surface.

According to the sixth aspect of the present invention, in the tooth flank dent detection method by the one tooth flank meshing type gear test, the master gear is used as a test gear meshing with the master gear. And is rotationally driven with a predetermined torque in a direction opposite to the rotational direction when the gear is inspected, and the gear to be tested is rotationally driven with a torque larger than the predetermined torque in the same direction as the rotational direction when the gear is used. One feature is that one tooth surface of each tooth of the test gear is brought into contact with the master gear, and a dent on the one tooth surface is detected.

According to the seventh aspect of the present invention, in the tooth flank dent detection method by the one tooth flank meshing type gear test, the master gear is used as the test gear meshing with the master gear. And rotationally driving the test gear in a direction opposite to the rotational direction at the time of rotation, in the same direction as the rotational direction when the gear is used, at a torque smaller than the predetermined torque, One feature is that one tooth surface of each tooth of the test gear is brought into contact with the master gear, and a dent on the one tooth surface is detected.

According to the eighth aspect of the present invention, in the tooth flank dent detection method based on the one tooth flank meshing type gear test, the rotation axis of the master gear and the rotation axis of the gear to be tested are described. The feature is that the separation distance between and is kept constant.

According to the eighth aspect of the present invention, in the tooth flank dent detection method based on the one tooth flank meshing gear test, the detected dent dent information is displayed. There is.

Therefore, according to the present invention, there is provided a tooth flank dent detection method by the one tooth flank meshing gear test capable of detecting the dent formed on the tooth flank of the test gear in a short time. Will be provided.

Further, according to the present invention, there is provided a method for detecting a dent mark on a tooth surface by a one-tooth-face meshing type gear test capable of calculating the height of the dent mark formed on the test gear. Become.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a configuration of a dent detection device to which an embodiment of a tooth surface dent detection method by a one-tooth-face meshing type gear test according to the present invention is applied.

FIG. 2 is a diagram schematically showing a change state of a fluctuation component of a rotation deviation when an embodiment of a tooth flank dent detection method by a one tooth flank meshing gear test according to the present invention is carried out.

FIG. 3 is a diagram showing an actual change state of a surplus pulse number as a difference between output pulses of both encoders.

[Explanation of symbols]

10 Detection device 12 Test gear 14 First drive system 16 master gear 18 Second drive system 20 Detection system 22 First drive shaft 24 1st bearing block 26 First Drive Mechanism 28 Second drive shaft 30 Second bearing block 32 Second drive mechanism 34 First drive motor 36 First Drive Pulley 38 First driven pulley 40 First Endless Belt 42 Second drive motor 44 Second drive pulley 46 Second driven pulley 48 Second Endless Belt 50 First Detection Encoder 52 Second encoder for detection 54 Comparison operation unit 56 dent detection unit 58 is a display unit.

─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-4-279835 (JP, A) JP-A-60-55242 (JP, A) JP-A-5-10852 (JP, A) JP-A-58- 186028 (JP, A) JP-A-61-205816 (JP, A) Jitsukai Hei 6-28692 (JP, U) JP-B 50-34430 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01M 13/02 G01B 21/20 102 G01N 21/88

Claims (9)

(57) [Claims] 1. The number of teeth of a master gear and the number of teeth of a test gear are set to be the same, and the master gear and the test gear having the thus set number of teeth are in one tooth surface meshing state, and Rotate at least one rotation by running a predetermined rotation torque, precisely measure the rotation amounts of both at this rotation with a predetermined resolution, and calculate the surplus pulse number from the difference between the measured values of the master gear and the test gear. And a dent formed on the tooth surface of the gear to be detected is detected based on the calculated surplus pulse, and a tooth mark dent detection method by a one-tooth-face meshing gear test. 2. The height of the dent is calculated from the calculated number of surplus pulses.
A method for detecting a dent mark on a tooth surface by the one tooth surface meshing type gear test described in. 3. A dent on a tooth surface by a one-tooth-face meshing gear test according to claim 1, wherein the dent is detected by rotating the master gear and a gear to be tested once. Detection method. 4. The test gear is rotationally driven in the same direction as the rotation direction when the gear is used with a predetermined torque, and the master gear is reversely rotated in the direction opposite to the rotation direction of the test gear. 2. The rotational drive is performed with a torque larger than the torque of 1. to bring one tooth surface of each tooth of the test gear into contact with the master gear, and a dent on the one tooth surface is detected. A method for detecting a dent mark on a tooth surface by the one tooth surface meshing type gear test described in. 5. The test gear is rotationally driven with a predetermined torque in the same direction as the rotation direction when the test gear is used, and the master gear is rotated in a direction opposite to the rotation direction of the test gear. 5. The rotational drive is performed with a torque smaller than the torque of 1., the other tooth surface of each tooth of the test gear is brought into contact with the master gear, and a dent on the other tooth surface is detected. A method for detecting a dent mark on a tooth surface by the one tooth surface meshing type gear test described in. 6. The master gear is rotationally driven with a predetermined torque in a direction opposite to a rotation direction when a gear to be inspected meshing with the master gear is used, and the gear to be inspected is rotated in a direction in which the gear is to be used. And rotationally driving in the same direction as the above-mentioned predetermined torque with a torque larger than the predetermined torque to bring one tooth surface of each tooth of the gear under test into contact with the master gear and detect a dent on the one tooth surface. The method for detecting a dent mark on a tooth surface by a one tooth surface meshing type gear test according to claim 1. 7. The master gear is rotationally driven with a predetermined torque in a direction opposite to a rotation direction when a gear to be inspected meshing with the master gear is used, and a rotation direction when the gear to be inspected is used. In the same direction as the above, the rotational drive is performed with a torque smaller than the predetermined torque, one tooth surface of each tooth of the gear under test is brought into contact with the master gear, and a dent on one tooth surface is detected. The method for detecting a dent mark on a tooth surface by a one tooth surface meshing type gear test according to claim 6. 8. The one-tooth-face meshing gear according to claim 1, wherein a separation distance between the rotation axis of the master gear and the rotation axis of the test gear is kept constant. Test method for detecting dents on the tooth surface. 9. The method for detecting a tooth dent in a tooth flank meshing type gear test according to claim 1, wherein the detected dent information is displayed.