JPH1096621A - Tooth shape evaluation method for bevel gear and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tooth shape evaluation method for bevel gear capable of avoiding judgment by appearance and fully automatically quantitatively evaluating the tooth shape by varying and controlling PMD(pinion mount distance) and a pinion offset value so that a specific tooth contact shape (scare tooth contact) is obtained at the position of specific first tooth contact, then varying and controlling the PMD and the pinion offset value so that a specific tooth contact shape (scare tooth contact) is obtained at the second tooth contact position apart from the first tooth contact position and evaluating the tooth shape from the variation of the PMD and the pinion offset value between the two tooth contact positions. SOLUTION: In this tooth shape evaluation method, PMD and pinion offset value are varied and controlled so that a specific tooth contact shape is obtained at the first tooth contact position X1 and PMD and pinion offset value are varied and controlled so that a specific tooth contact shape is obtained at the second tooth contact position X2 apart from the first tooth contact position X1 for a specific distance. Thus, tooth shape evaluation is made based on the variation of the PMD and pinion offset value between the first and the second tooth contact positions X1 and X2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bevel gear tooth profile evaluation method and apparatus for evaluating the tooth profile of a bevel gear (bevel gear) such as a final reduction gear (hypoid gear) for an automobile.

[0002]

2. Description of the Related Art Generally, a bevel gear pair P of a bevel gear 100 and a pinion gear 101 as shown in FIGS.
MD (pinion mount distance) direction, E
It is known that the meshing contact mark (that is, the tooth contact) 103 shown in FIG. 13 moves due to a relative position change in the (pinion offset amount) direction.

Using this characteristic, the relative position change amount required for a specific tooth contact shape (scare tooth contact) to move between two points on the tooth surface is obtained. It can be evaluated by an equation. Tooth profile = ΔE / ΔPMD = (V2-V1) / (H2-H
1) However, ΔE is a change amount in the E direction. ΔPMD is a change amount in the PMD direction. H1 and H2 are arrangement errors in the PMD direction (see FIG. 7). V1 and V2 are arrangement errors in the E direction (see FIG. 7).

However, conventionally, in order to evaluate the set tooth profile of the above-described bevel gear 100 and pinion gear 101, while rotating a gear in which these two gears 100 and 101 are combined in advance, the operator is required to rotate the gear. Due to the fact that the evaluation has been performed visually, there has been a problem that accurate evaluation is impossible, and judgment errors and the like frequently occur. On the other hand,
Although a meshing gear rotation error detecting device as described in JP-A-229880 has already been invented, this device merely detects a gear transmission error and cannot evaluate the tooth profile.

[0005]

According to the first aspect of the present invention, the PMD and the pinion offset amount are changed so that a specific tooth contact shape (scare tooth contact) can be obtained at a predetermined first tooth contact position. Then, the PMD and the pinion offset amount are changed and adjusted so that a specific tooth contact shape (scare tooth contact) is obtained at the second tooth contact position separated from the first tooth contact position. PMD between each tooth contact position,
An object of the present invention is to provide a bevel gear tooth profile evaluation method capable of performing a fully automatic quantitative evaluation of a tooth profile by performing a tooth profile evaluation based on a change amount of a pinion offset amount, thereby eliminating visual judgment.

In addition to the object of the first aspect of the present invention, the second aspect of the present invention provides a specific tooth contact shape (scare tooth contact) at each of the first and second tooth contact positions. By obtaining the tooth contact position in) by image processing,
An object of the present invention is to provide a bevel gear tooth profile evaluation method capable of easily and accurately obtaining a tooth contact position by this image processing.

According to a third aspect of the present invention, in addition to the object of the first aspect, a PMD at a specific tooth contact is obtained by measuring an engagement transmission error, so that, for example, an engagement transmission error is minimized. It is an object of the present invention to provide a bevel gear tooth profile evaluation method capable of accurately measuring a point to be detected and accurately detecting a specific tooth contact.

According to a fourth aspect of the present invention, a PMD
With the provision of the adjusting means, the pinion offset amount adjusting means, the image processing means and the evaluating means, it is possible to perform the full-automatic quantitative evaluation of the tooth profile by eliminating the conventional visual judgment, and to perform the first tooth contact position and the second Provided is a bevel gear tooth profile evaluation device that can easily and accurately determine the tooth contact position by determining the tooth contact position in a specific shape (scare tooth contact) at the tooth contact position by image processing by image processing means. With the goal.

According to a fifth aspect of the present invention, in addition to the object of the fourth aspect of the present invention, there is provided a meshing transmission error measuring means for determining the PMD at the specific tooth contact by measuring the meshing transmission error. It is another object of the present invention to provide a bevel gear tooth profile evaluation device capable of accurately measuring, for example, a point at which a meshing transmission error is minimized by this measuring means and accurately detecting a specific tooth contact.

[0010]

According to a first aspect of the present invention, there is provided a method for evaluating the tooth profile of a bevel gear, wherein a PM contact shape is obtained at a predetermined first contact position.
D, the pinion offset amount is changed and adjusted, and then the PMD and the pinion offset amount are changed so that a specific tooth contact shape is obtained at a second tooth contact position that is a predetermined position away from the first tooth contact position. And adjust the first and second
The present invention is characterized in that it is a method for evaluating the tooth profile of a bevel gear in which the tooth profile is evaluated based on the amount of change in the amount of PMD and pinion offset between each tooth contact position.

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the present invention, a bevel gear for obtaining a tooth contact position in a specific tooth contact shape at each tooth contact position by image processing. Characterized in that it is a tooth profile evaluation method.

According to a third aspect of the present invention, there is provided a bevel gear tooth profile evaluation method for obtaining the PMD at the specific tooth contact by measuring a meshing transmission error in addition to the configuration of the first aspect of the present invention. It is characterized by the following.

According to a fourth aspect of the present invention, there is provided a tooth profile evaluation device for a bevel gear, wherein a PMD and a pinion offset amount are changed so that a specific tooth contact shape is obtained at a predetermined first tooth contact position. PMD adjusting means and a pinion offset for adjusting by adjusting the PMD and the pinion offset amount so as to obtain a specific tooth contact shape at a second tooth contact position separated from the first tooth contact position by a predetermined position. Amount adjusting means, evaluation means for evaluating the tooth profile based on the amount of change in the amount of PMD and pinion offset between the first and second tooth contact positions, and specific teeth at the first and second tooth contact positions The present invention is characterized in that the bevel gear tooth profile evaluation device includes image processing means for obtaining a tooth contact position in a contact shape by image processing.

According to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect of the present invention, there is provided a meshing transmission error measuring means for determining a PMD at the specific tooth contact by measuring a meshing transmission error. It is a bevel gear tooth profile evaluation device.

[0015]

According to the first aspect of the present invention, when the tooth profile of the bevel gear is evaluated, first, the PM contact is set so that a specific tooth contact shape is obtained at a predetermined first tooth contact position.
D (pinion mount distance), the pinion offset amount is changed and adjusted, and then a specific tooth contact shape is obtained at a second tooth contact position that is a predetermined position away from the above-described first tooth contact position. Then, the PMD and the pinion offset amount are changed and adjusted, and then the tooth profile is evaluated based on the change amount of the PMD and the pinion offset amount between the first tooth contact position and the second tooth contact position. For this reason, there is an effect that a full automatic quantitative evaluation of the tooth profile can be performed without the conventional visual judgment.

Here, the above-mentioned tooth profile is ΔE / ΔPMD =
It is represented by (V2-V1) / (H2-H1). Where ΔE is the change amount in the pinion offset amount direction ΔPMD is the change amount in the PMD direction H1 and H2 are the placement errors in the PMD direction (see FIG. 7) V1 and V2 are the placement errors in the E direction (see FIG. 7) It has been recognized from experimental results that a tooth profile of about 1.2 is a good tooth profile. It has been recognized that tooth contact and gear noise are degraded at both 1.2 and less than 1.2. Thus, automatic quantitative evaluation of the tooth profile can be executed.

According to the invention described in claim 2 of the present invention,
In addition to the effect of the first aspect of the present invention, the above-mentioned tooth contact position, that is, the tooth contact position in the specific tooth contact shape at the first tooth contact position and the second tooth contact position is obtained by image processing. There is an effect that a tooth contact position can be easily and accurately obtained by image processing, and automation of tooth profile evaluation can be achieved.

According to the third aspect of the present invention,
In addition to the effect of the first aspect of the present invention, since the PMD at the specific tooth contact is obtained by measuring the mesh transmission error, for example, a point where the mesh transmission error is minimized is accurately measured, There is an effect that tooth contact can be accurately detected.

According to the invention described in claim 4 of the present invention,
The above-mentioned PMD adjustment means and pinion offset amount adjustment means adjust the PMD and pinion offset amount so as to obtain a specific tooth contact shape at a predetermined first tooth contact position, and adjust the above-mentioned first tooth contact. The PMD and the pinion offset amount are changed and adjusted so that a specific tooth contact shape is obtained at the second tooth contact position that is separated from the position by a predetermined position.

The above-mentioned evaluation means performs the tooth profile evaluation based on the change amount (ΔPMD, ΔE) of the PMD and the pinion offset amount between the first and second contact positions, and the image processing means performs the above-described first and second tooth positions. The tooth contact position in the specific tooth contact shape at each tooth contact position of No. 2 is obtained by image processing. As a result, it is possible to perform the full-automatic quantitative evaluation of the tooth profile by eliminating the conventional visual judgment, and to obtain the tooth contact position easily and accurately because the tooth contact position is obtained by image processing by the image processing means. There is an effect that can be.

According to the invention described in claim 5 of the present invention,
In addition to the effect of the fourth aspect of the present invention, the above-mentioned meshing transmission error measuring means obtains the PMD at a specific tooth contact by measuring the meshing transmission error. There is an effect that a certain point can be accurately measured to accurately detect a specific tooth contact.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. Prior to the description of the bevel gear tooth profile evaluation method of the present invention, first, the configuration of a bevel gear tooth profile evaluation device will be described with reference to FIGS.

FIG. 1 is a side view showing an apparatus for evaluating the tooth profile of a bevel gear, and a slider 3 movable on the apparatus main body 1 via two parallel guide rails 2 and 2 in the PMD direction (H-axis direction).
And the slider 3 is used as a PMD adjusting means.
The D servo motor 4 is configured to move in the PMD direction. Specifically, a screw is connected to a rotation shaft of the PMD servomotor 4 and a screw is screwed into a screw hole of the slider 3 to move the slider 3 in the PMD direction when the PMD servomotor 4 rotates. At the same time, the moving amount is detected on a linear scale and fed back so as to match the command value.

As shown in FIGS. 1 and 2, a pair of guide members 5 and 5 are erected on the slider 3 as described above, and between the pair of guide members 5 and 5 is a direction E (pinion offset). A gear arbor column 6 movably supported in both directions is provided, and the gear arbor column 6 is moved in a direction E (V) by a servomotor 7 as a pinion offset amount adjusting means.
(Axial direction). Specifically, the screw 8 is connected to the rotation shaft of the servomotor 7 and the screw 8 is screwed into the screw hole of the gear arbor column 6 to move the gear arbor column 6 in the E direction when the servomotor 7 rotates. In addition to such a configuration, the moving amount is detected on a linear scale and is fed back so as to match the command value.

The above-mentioned gear arbor column 6 is placed at an appropriate position in the direction E and is releasably clamped by a clamping means such as a hydraulic clamping device or an air clamping device.

The above-mentioned gear arbor column 6 is provided with a motor 9, a power transmission mechanism 10, a rotary encoder 11, a rotary shaft 12, and a gear mounting portion 13 as shown in FIGS. Bevel gear 1 as one of the pair
4 Install.

On the other hand, in FIG. 1, a pinion arbor column 15 which can be slidably fixed in a lateral direction (direction of arrow a) orthogonal to the PMD direction is provided. This pinion arbor column 1
5 includes a motor 16, a power transmission mechanism 17, a rotary encoder 18, and a pinion gear mounting portion, as shown in FIGS. 1 and 4, and a pinion gear 19 is mounted on the pinion gear mounting portion.

An air cylinder 21 is provided on the top deck of the gear arbor column 6 via an L-shaped support member 20 or the like.
Is attached to the movable part 22 of the air cylinder 21.
Imaging means such as a D camera (hereinafter simply referred to as a camera) 2
3, the camera 23 is moved downward by the air cylinder 21 (see the virtual line α in FIG. 1) only at the time of image capturing, and the camera 23 captures an image at the image capturing position β shown in FIG. .

That is, the camera 23 captures an image of a non-meshed portion offset from the center of the bevel gear 14 by the opening angle θ in a state where the bevel gear 14 and the pinion gear 19 are meshed. Here, the above-mentioned opening angle θ is about 3
Set to 0 degrees. The camera 23 has a reverse camera 23R and a drive camera 23D as shown in FIG.
And

Next, the configuration of a control circuit of the bevel gear tooth profile evaluation device will be described with reference to FIG. Motor control unit 24
Drives and controls the motors 9 and 16 and the servo motors 4 and 7, while the pinion drive motor 16 acts as a drive during acceleration and acts as a brake during deceleration. The load urging motor 9 acts as a brake during acceleration and acts as a drive during deceleration.

The rotary encoders 11 and 18 transmit pulse signals necessary for obtaining the meshing transmission error to the correction unit 25 in the next stage.
Output to The correction unit 25 includes amplifiers 26 and 27, a multiplication unit 28.29, and a gear ratio correction unit 30 and 31. The output of the rotary encoder 18 on the pinion gear 19 side is amplified by the amplifier 26 and then multiplied by the multiplication unit 28. The bevel gear 14 is multiplied by the reciprocal of the number of teeth Z2 of the bevel gear 14, that is, (1 / Z2).

Rotary encoder 1 on bevel gear 14 side
The one output is amplified by the amplifier 27, then multiplied by the multiplying unit 29, and then output to the pinion gear 19 by the next gear ratio correcting unit 31.
Is multiplied by the reciprocal of the number of teeth Z1, ie, (1 / Z1). The signal in which the pulses are aligned in this manner is input to the phase difference calculator 32, which calculates the phase difference between the pinion rotation angle and the bevel gear rotation angle.

The next stage of the above-mentioned phase difference calculation unit 32 has an FFT
An analyzer 33 (first Fourier transfer analyzer) is connected, and the FFT analyzer 33
In this configuration, the primary component of the meshing caused by the motor 16 not rotating at a constant speed is Fourier-transformed to linearize the characteristic of the bevel gear rotation angle with respect to the pinion rotation angle. Obtain the corresponding signal. The signal of this meshing transmission error is CP
It is input to U34. On the other hand, an acceleration detector 35 is arranged near the axis of the pinion gear 19, and its output is
6 to be output to the FFT analyzer 33 and the dent calculating section 37.

The CPU 34 controls the driving of a plotter 38 (plotter, a device for drawing a straight line graph, a figure) and a printer 39 based on the signal input of the mesh transmission error.
The motor control unit 24, V, H via the interface 40
Position display section 41, rotation number display section 42, torque display section 43
Drive control.

The image signal picked up by the camera 23 is sent to the image processing / calculating section 44, and the data subjected to the image processing / calculating is input to the CPU 34. On the other hand, the vertical movement of the camera 23 is controlled by a cylinder control unit 45.

Here, the PMD servo motor 4 as the PMD adjusting means and the servo motor 7 as the pinion offset amount adjusting means have a specific tooth contact shape (scare tooth contact) having a predetermined first tooth contact position x1 (FIG. 7). In addition to changing the PMD and E so as to obtain the same, the specific tooth contact shape (see FIG. 7) at the second tooth contact position x2 (see FIG. 7) away from the first tooth contact position x1 by a predetermined position. PMD and E are changed and adjusted so as to obtain (scare tooth contact). Note that x1 = 12 to 15 mm and x2 = 20 mm are set in advance.

Each of the elements 11, 18, 25- shown in FIG.
The meshing transmission error measuring means 46 is constituted by 33, and the meshing transmission error measuring means 46 obtains the PMD at a specific tooth contact (scare tooth contact) by measuring the meshing transmission error. Further, the above-mentioned CPU 34 performs image processing means for obtaining the tooth contact position in the specific tooth contact shape (scare tooth contact) at the first tooth contact position x1 and the second tooth contact position x2 by image processing (flow chart shown in FIG. 5). Of the third step S3
And the eighth step S8), and the first tooth contact position x1
And the amount of change in PMD, E between the second tooth contact position x2 (Δ
Evaluation means (PMD, ΔE) for evaluating the tooth profile (FIG. 5)
(See the tenth step S10 in the flowchart shown in FIG. 3).

Next, a method for evaluating the tooth profile of the bevel gear will be described with reference to the flowchart shown in FIG. 5 and the flowchart shown in FIG. In the first step S1, the bevel gear 14 and the pinion gear 19 are attached to the device as shown in FIGS. 1 and 3, and these two gears 14, 19 are meshed.

Next, in a second step S2, the meshing transmission error of the bevel gear pair (FIG. 6) is measured by the meshing transmission error measuring means 46 of FIG.
PMD of specific tooth (scare tooth contact)
That is, a point at which the meshing transmission error is minimized is obtained. Next, in a third step S3, the movable part 22 of the air cylinder 21 and the camera 23 are lowered to the position of the imaginary line α in FIG. 1, and the image of the imaging position β in FIG. Image 2 shows the tooth contact position in the shape (scare tooth contact)
It is obtained by a binarization process (however, details will be described later with reference to the flowchart of FIG. 8).

Next, in a fourth step S4, the tooth contact position in the specific tooth contact shape is set to the first position as the specific position shown in FIG.
It is determined whether or not the tooth contact position is x1. When the determination is NO, the process proceeds to the fifth step S5. On the other hand, when the determination is YES, the data of PMD = H1, E = V1 at the first tooth contact position x1 is stored in storage means such as a RAM. After that, the process proceeds to another sixth step S6.

In the above-mentioned fifth step S5, the CPU 34 determines the PMD, E to the first tooth contact position x1 based on the database.
The movement amount is calculated, and the interface 40, the motor control unit 2
4 and the servomotors 4 and 7 are controlled to move the bevel gear pair. In this embodiment, only the bevel gear 14 is moved in the PMD direction and the E direction by the servomotors 4 and 7, and then the process returns to the above-described second step S2.

On the other hand, if it is determined in the fourth step S4 that the tooth contact position in the specific tooth contact shape is the first tooth contact position x1, the control proceeds to the next sixth step S6 in which the CP is determined.
U34 calculates the amount of PMD and E movement to the second tooth contact position x2 as a specific position (however, a position distant from the first tooth contact position x1) from the database, and
0, the bevel gear 14 is moved by controlling the motor control unit 24 and the servomotors 4 and 7.

Next, in a seventh step S7, the meshing transmission error (FIG. 6) of the bevel gear pair is measured by the meshing transmission error measuring means 46 of FIG.
PMD of specific tooth (scare tooth contact)
That is, a point at which the meshing transmission error is minimized is obtained. Next, in an eighth step S8, the movable part 22 of the air cylinder 21 and the camera 23 are lowered again to the position of the imaginary line α in FIG. 1, and the image of the imaging position β in FIG.
The tooth contact position in the specific tooth contact shape (scare tooth contact) is obtained by image binarization processing (for details, see FIG. 8).
Will be described later with reference to the flowchart of FIG.

Next, in a ninth step S9, it is determined whether or not the tooth contact position in the specific tooth contact shape is the second tooth contact position x2 as the specific position shown in FIG. 7. If NO, the process returns to the sixth step S6. On the other hand, when the determination is YES, the data of PMD = H2 and E = V2 at the second tooth contact position x2 is stored in the RAM when the determination of YES is made.
After storing in the storage means such as the following tenth step S1
Move to 0.

In the tenth step S10, the CPU 34
Is the relative position change amount (Δ) required for the movement between the two points x1 and x2.
E = V2−V1, ΔPMD = H2−H1), ΔE / ΔPMD = (V2−X1) / (H2−H1) Tooth profile evaluation is executed by the above equation, and the calculated value of the above equation is displayed.

Next, the image binarization processing will be described with reference to the flowchart of FIG. The flowchart in FIG. 8 is a subroutine corresponding to the processing in the third step S3 and the eighth step S8 in the flowchart in FIG. 5 described above. In a first step S11, the CPU 34 captures an image from the camera 23, and in a next second step S12, the CPU 34 removes noise of the gray image by a filtering process.

Next, in a third step S13, the CPU 34 extracts shape edges in the tooth trace direction and the tooth profile direction. (See FIG. 9). Next, in a fourth step S14, the CPU 34 calculates a reference line and an intersection in the tooth trace direction and the tooth profile direction (FIG. 9).
reference). The processing in the third and fourth steps S13 and S14 is processing for recognizing the position of the tooth surface on the screen.

Next, in a fifth step S15, the CPU 34 sets an upper limit line and a lower limit line of the tooth contact detection area (see FIG. 9). Next, in a sixth step S16, the CPU 34
Sets a threshold calculation window for tooth contact extraction.
(See FIG. 9). Next, in a seventh step S17, the CPU 34
Calculates the threshold value for tooth contact extraction necessary for the binarization process.

Next, in an eighth step S18, the CPU 34 binarizes the tooth contact portion (bright portion) into a high level signal and the non-tooth contact portion (dark portion) into a low level signal according to the above-described threshold value.
The noise is removed and a labeling process is performed to extract a tooth contact portion b (see FIG. 9). Next, the ninth step S
At 19, the CPU 34 detects the feature amount. Specifically, the position of the center of gravity of the tooth contact portion b is obtained by calculation.

Next, in a tenth step S20, the CPU 34
Calculates the orthogonal distance (distance from the toe portion) to the tooth trace and the tooth profile at the center of gravity, and calculates the tooth contact position x shown in FIG.
A value corresponding to 1, x2 is determined. The processing in the subroutine shown in FIG. 8 is reflected in the processing of the main routine shown in FIG. 5, and the tooth profile evaluation is executed in the tenth step S10 (see FIG. 5).

The steps from the cutting of the bevel gear to the OK product qualification process will be briefly described with reference to the process chart shown in FIG. 10. The bevel gear is cut in the first step S 31, and the second step S 31
At 32, the bevel gear is subjected to a heat treatment, and at a third step S33, the bevel gear is subjected to a lapping process, and at a fourth step S34.
Checking the transmission error of the bevel gear pair by sampling inspection, V (Pinion offset), H by image processing
(PMD) is checked (see the flowcharts in FIGS. 5 and 8), and when the evaluation is OK, O is set in the fifth step S35.
It is determined that the product is a K product.
After the tooth surface is measured using the three-dimensional measuring device in step 7, it is determined whether the gear cutting setting correction or the lap setting correction is to be performed in the seventh step (S37). When the lap is determined, the lapping in the third step S33 is performed. This is fed back to the processing, and is fed back to the gear cutting processing in the first step S31 when the gear cutting is determined.

In short, according to the bevel gear tooth profile evaluation method of this embodiment, when evaluating the bevel gear tooth profile, first, a specific tooth contact shape (scare tooth contact) is obtained at a predetermined first tooth contact position x1. The pinion mount distance (PMD) and the pinion offset amount are adjusted so as to be adjusted, and then a specific tooth contact is made at a second tooth contact position x2 which is a predetermined position away from the above-mentioned first tooth contact position x1. The PMD and the pinion offset amount are changed and adjusted so as to obtain the shape (scare tooth contact), and then the PMD and the pinion offset amount between the first tooth contact position x1 and the second tooth contact position x2 are adjusted. The tooth profile is evaluated based on the amount of change. For this reason, there is an effect that a full automatic quantitative evaluation of the tooth profile can be performed without the conventional visual judgment.

The above-described tooth profile is ΔE / ΔPMD = (V2−V
1) / (H2-H1).

It has been recognized by experiment results that the value of the above equation is about 1.2, which is a good tooth profile. It is recognized that the tooth contact and gear noise are deteriorated when the value is 1.2 or more and less than 1.2. Therefore, automatic quantitative evaluation of the tooth profile can be executed by the above method.

Further, since the tooth contact position in the specific tooth contact shape (scare tooth contact) at each of the above-mentioned tooth contact positions, that is, the first tooth contact position x1 and the second tooth contact position x2, is obtained by image processing, this image is obtained. There is an effect that the contact position can be easily and accurately obtained by the processing, and automation of the tooth profile evaluation can be achieved.

Further, the PM at the specific tooth contact described above is determined.
Since D is obtained by measuring the meshing transmission error, there is an effect that, for example, a point where the meshing transmission error is minimized is accurately measured, and a specific tooth contact can be accurately detected.

In addition, according to the bevel gear waveform evaluation apparatus of the present embodiment, the above-described PMD adjusting means (see the PMD servo motor 4) and the pinion offset amount adjusting means (see the servo motor 7) are provided with a specific tooth contact. Shape (Scare tooth contact)
PMD so that is obtained at the predetermined first contact position x1.
E is changed and adjusted, and the PM is adjusted so that a specific tooth contact shape (scare tooth contact) is obtained at the second tooth contact position x2 which is separated from the first tooth contact position x1 by a predetermined position.
Adjust by changing D and E.

The evaluation means S10 evaluates the tooth profile based on the amount of change (.DELTA.PMD, .DELTA.E) in PMD and E between the first and second tooth contact positions x1 and x2, and the image processing means S3 and S8 perform the above-described evaluation. The tooth contact position in the specific tooth contact shape (scare tooth contact) at the first and second tooth contact positions x1 and x2 is determined by image processing. As a result, it is possible to perform the full-automatic quantitative evaluation of the tooth profile by eliminating the conventional visual judgment and to determine the tooth contact position by the image processing means S.
3, since it is obtained by image processing in S8, there is an effect that the contact position can be easily and accurately obtained.

In addition, the above-described meshing transmission error measuring means 46
Calculates the PMD at a specific tooth contact by measuring the meshing transmission error. Therefore, the measuring means 46 accurately measures, for example, a point at which the meshing transmission error is minimized, and accurately detects the specific tooth contact. There is an effect that can be.

In the configuration of the present invention and the above-described embodiment, the bevel gear of the present invention corresponds to the bevel gear 14 of the embodiment. Similarly, the specific tooth contact shape corresponds to the scare tooth contact, and the PMD The adjusting means corresponds to the PMD servomotor 4, the pinion offset amount adjusting means corresponds to the servomotor 7, the evaluating means corresponds to the tenth step S10 under CPU control, and the image processing means corresponds to each of the CPU controlling steps. Although corresponding to steps S3 and S8, the present invention is not limited to only the configuration of the above-described embodiment.

[Brief description of the drawings]

FIG. 1 is a side view of a tooth profile evaluation device used in the bevel gear tooth profile evaluation method of the present invention.

FIG. 2 is a partial perspective view of FIG.

FIG. 3 is an explanatory view showing an image pickup site of an image by a camera.

FIG. 4 is a control circuit block diagram of the tooth profile evaluation device.

FIG. 5 is a flowchart showing tooth profile evaluation.

FIG. 6 is an explanatory diagram showing a relationship between a PMD and a mesh transmission error.

FIG. 7 is an explanatory diagram showing a first tooth contact position and a second tooth contact position.

FIG. 8 is a flowchart illustrating image binarization processing.

FIG. 9 is an explanatory diagram of each element required for image binarization processing.

FIG. 10 is a process chart showing steps from gear cutting to OK product certification processing.

FIG. 11 is an explanatory diagram of a pinion mount distance.

FIG. 12 is an explanatory diagram of a pinion offset amount.

FIG. 13 is an explanatory view of an engagement contact mark.

[Explanation of symbols]

 4 PMD servo motor 7 Servo motor 14 Bevel gear 46 Meshing transmission error measuring means S3, S8 Image processing means S10 Evaluation means x1 First tooth contact position x2 Second tooth contact position

Claims (5)

[Claims] 1. A method for evaluating a tooth profile of a bevel gear, wherein a PM contact shape is obtained so that a specific tooth contact shape is obtained at a predetermined first tooth contact position.
D, the pinion offset amount is changed and adjusted, and then the PMD and the pinion offset amount are changed so that a specific tooth contact shape is obtained at a second tooth contact position that is a predetermined position away from the first tooth contact position. And adjust the first and second
The bevel gear tooth profile evaluation method of performing the tooth profile evaluation based on the amount of change in the PMD and pinion offset between each tooth contact position. 2. The bevel gear tooth profile evaluation method according to claim 1, wherein the tooth contact position in the specific tooth contact shape at each tooth contact position is obtained by image processing. 3. The bevel gear tooth profile evaluation method according to claim 1, wherein the PMD at the specific tooth contact is obtained by measuring a mesh transmission error. 4. An apparatus for evaluating the tooth profile of a bevel gear, wherein a specific contact shape is obtained at a predetermined first contact position.
D, while changing and adjusting the pinion offset amount, and changing the PMD and the pinion offset amount so that a specific tooth contact shape is obtained at a second tooth contact position that is a predetermined position away from the first tooth contact position. PMD adjusting means and pinion offset amount adjusting means for adjusting; PMD between the first and second tooth contact positions; and evaluation means for performing tooth profile evaluation based on the amount of change in pinion offset amount;
A bevel gear tooth profile evaluation device, comprising: image processing means for obtaining a tooth contact position in a specific tooth contact shape at each second tooth contact position by image processing. 5. The bevel gear tooth profile evaluation device according to claim 4, further comprising a meshing transmission error measuring means for determining the PMD at the specific tooth contact by measuring a meshing transmission error.