JP3586994B2 - Bevel gear tooth contact evaluation method and apparatus - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bevel gear tooth contact evaluation method and apparatus for evaluating the contact between a pinion gear and a ring gear (bevel gear) of a differential gear, for example.
[0002]
[Prior art]
Generally, when the bevel gear 51 and the pinion gear 52 are meshed with each other as shown in FIGS. 5 and 6, when the pinion gear 52 approaches the horizontal minus direction (H-direction) in the PMD (pinion mount distance), a tooth contact occurs. When sinking occurs and the pinion gear 52 moves away in the horizontal plus direction (H + direction), floating occurs at the tooth contact. Similarly, in the GMD (gear mount distance), when the pinion gear 52 approaches the vertical plus direction (V + direction) or moves away in the vertical minus direction (V- direction), ups and downs of the teeth occur, and FIG. For the sake of convenience, the gear noise is minimized at the portion where the meshing transmission error indicated by hatching is minimum, and the gear noise is large even if the meshing contact mark (see the hatched portion) as the contact position in any direction indicated by the arrow in FIG. It is known to be.
[0003]
By the way, conventionally, in order to evaluate the set tooth contact of the bevel gear 51 and the pinion gear 52, while rotating a gear in which these two gears 51 and 52 are combined in advance, the operator visually checks the gear. Due to the fact that the evaluation has been performed, there has been a problem that accurate evaluation is impossible, and judgment errors and the like frequently occur.
On the other hand, a meshing gear rotation error detecting device as described in JP-A-6-229880 has already been invented, but this device is merely a device for detecting a gear transmission error. Is impossible.
[0004]
[Problems to be solved by the invention]
The inventions is engaged so the bevel gear and the pinion gear, the per tooth was varied by changing the meshing allowed position when measured meshing transmission error at that time, the minimum value of the meshing transmission error, regardless of the tooth die teeth Paying attention to the fact that the ups and downs are zero (scare), at least the minimum part (point at which the arrangement error is zero ) of the standard meshing transmission error in the normal gear (master gear ) is determined (actually, the normal gear and when determined using, including both when obtained in advance a reference value as data), then measuring the difference erroneous meshing transmission with multiple number of location in the measuring wheel against either one of the directions of PMD direction or GMD direction (measured) and, by comparing the measured meshed transmission error and the reference measurement gear to evaluate the teeth per position, without visual assessment of the operator, it is possible to qualitatively assess the per tooth And an object thereof is to provide a tooth per evaluation method of the gear.
[0005]
One embodiment of the invention, by teeth per position by the relationship between the PMD and the meshing transmission error in the regular gear above mentioned the (Standards teeth per position) is obtained in advance, the teeth per measurement gear qualitative It is another object of the present invention to provide a bevel gear tooth contact evaluation method capable of performing a more accurate and more accurate evaluation.
[0006]
The present invention also provides a reference setting means for determining a minimum portion of the meshing transmission error as a point at which the arrangement error serving as a reference for the normal gear becomes zero (in a case where the reference value is actually set using a normal gear, as the advance include both the case of setting), and measuring means for measuring the meshing transmission erroneous difference double the number of location for either direction of the PMD direction or GMD direction in the measurement wheel, the measured measured gear Evaluating means for comparing the meshing transmission error and the above-mentioned criterion to evaluate whether the tooth contact position is good or bad, by using a bevel gear that can qualitatively evaluate the tooth contact without visual evaluation of the working vehicle. The purpose is to provide a tooth contact evaluation device.
[0007]
[Means for Solving the Problems]
Tooth evaluation method of the bevel gear according to the invention, the smallest portion of the meshing transmission errors as a reference in the least normal gear determined, then in measuring gears either double the number of location for one direction of the PMD direction or GMD direction measuring the meshing transmission erroneous difference, it is to evaluate the teeth per position by comparing the mesh transmission error and the reference of the measured measured gear.
[0008]
In one embodiment of the present invention, the tooth contact position based on the relationship between the PMD of the regular gear and the mesh transmission error is determined in advance .
[0009]
Tooth evaluation device of the bevel gear according to the invention, at least a reference setting means for obtaining a reference made meshing minimum unit of transmission errors in the regular gear, double the number of for either direction of the PMD direction or GMD direction in the measurement gear measuring means for measuring the meshing transmission erroneous difference location, in which a evaluating means for evaluating tooth per position by comparing the mesh transmission error and the reference measurement gears that are the measurement.
[0010]
Function and effect of the present invention
According to the bevel gear tooth contact evaluation method of the present invention, at least the minimum portion of the meshing transmission error (the point where the arrangement error becomes zero) which is a reference for the normal gear is obtained, and then the PMD direction or measuring the meshing transmission erroneous difference double the number of location for either one of the directions of GMD direction, meshing transmission error of the measured measured gear and the above criteria to evaluate the teeth per position of the measuring wheel is compared Therefore, there is an effect that the tooth contact can be qualitatively evaluated without relying on the visual evaluation of the operator as in the conventional method.
[0011]
According to one embodiment of the present invention, since obtaining the teeth per position by the relationship between the PMD and the meshing transmission error in the pre-Me regular gear (Standards teeth per position), the minimum value of the meshing transmission error (for example, H = Compared to the method of determining only the point (0), there is an effect that the contact of the tooth of the measuring gear can be qualitatively and more accurately evaluated.
[0012]
According to the bevel gear tooth contact evaluation device of the present invention, the above-described reference setting means obtains at least a minimum portion of the meshing transmission error which is a reference for the normal gear, and the measuring means determines whether the measurement gear has a PMD direction or a GMD direction. or for one direction measures the difference erroneous meshing transmission with multiple number of location, evaluation means compares the criteria set in the meshing transmission error of measurement gear measured by the above-mentioned measuring means above the reference setting means To evaluate the position of the tooth contact of the measuring gear.
As a result, there is an effect that the tooth contact can be qualitatively evaluated without using the conventional visual evaluation of the operator.
[0013]
【Example】
An 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 contact evaluation method of the present invention, first, the configuration of a bevel gear tooth contact evaluation apparatus will be described with reference to FIGS.
[0014]
FIG. 1 is a plan view showing a tooth contact evaluation device of a bevel gear, which is configured to move in a PMD direction on a base 1 via two parallel guide rails 2. Specifically, the screw 5 is connected to the rotation shaft of the servo motor 4 and the screw 5 is screwed into the screw hole of the slider 3 so that the slider 3 moves in the PMD direction when the servo motor 4 rotates. At the same time, the moving amount is detected by the linear scale 6.
[0015]
The gear arbor column 8 in the longitudinal direction of the guide 7, 7 are movably supported in the GMD direction provided on the slider 3 above, G M D of the gear arbor column 8 by a servomotor 9 as V-axis feed means It is configured to move in the direction. Specifically, the screw 10 is connected to the rotating shaft of the servo motor 9 and the screw 10 is screwed into the screw hole of the gear arbor column 8 to move the gear arbor column 8 in the GMD direction when the servo motor 9 rotates. It is configured as follows.
As shown in FIGS. 1 and 2, the gear arbor column 8 includes a motor 11, a power transmission mechanism 12, a rotary encoder 13, a rotating shaft 14, and a gear mounting portion 15. The gear mounting portion 15 has a bevel gear as a bevel gear. attaching the base Berugiya 16.
[0016]
On the other hand, another two parallel guide rails 17, 17 are mounted on the base 1 so as to be orthogonal to the two guide rails 2, 2, and a pinion arbor column 18 is mounted on each of the guide rails 17, 17. Provided. 1 and 2, the pinion arbor column 18 includes a motor 19, a power transmission mechanism 20, a rotary encoder 21, and a pinion gear mounting portion 22, and a pinion gear 23 is mounted on the gear mounting portion 22. The guide rails 17 guide the pinion arbor column 18 when the pinion gear 23 meshes with the bevel gear 16.
[0017]
Next, the configuration of a control circuit of the bevel gear tooth contact evaluation device will be described with reference to FIG.
The motor control unit 24 controls the driving of the motors 11 and 19 and the servomotors 4 and 9, and the motor 19 for driving the pinion functions as a drive during acceleration and acts as a brake during deceleration. The load energizing motor 11 acts as a brake during acceleration and acts as a drive during deceleration.
[0018]
The rotary encoders 13 and 21 output a pulse signal necessary for obtaining an engagement transmission error to the correction unit 25 at the next stage.
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 21 on the pinion gear 23 side is amplified by the amplifier 26 and then multiplied by the multiplication unit 28. The bevel gear 16 is multiplied by the reciprocal of the number of teeth Z2 of the bevel gear 16, that is, (1 / Z2).
[0019]
The output of the rotary encoder 13 on the side of the bevel gear 16 is amplified by an amplifier 27 and then multiplied by a multiplying unit 29, and then multiplied by a reciprocal of the number of teeth Z1 of the pinion gear 23, that is, (1 / Z1) by the next gear ratio correcting unit 31. Is done.
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.
[0020]
An FFT analyzer 33 (Fast Fourier Transfer Analyzer) is connected to the next stage of the above-described phase difference calculation unit 32. In this FFT analyzer 33, a primary component of the meshing caused by the motor 19 not rotating at a constant speed is detected. Fourier transform is performed to linearize the characteristic of the bevel gear rotation angle with respect to the pinion rotation angle, and a signal corresponding to the mesh transmission error is obtained at the output stage of the FFT analyzer 33. The signal of the mesh transmission error is input to the CPU 34.
[0021]
On the other hand, an acceleration detector 35 is arranged near the axis of the pinion gear 23, and the output of the acceleration detector 35 is output to the FFT analyzer 33 and the dent calculating unit 37 via the amplifier 36.
The CPU 34 controls the drive of a plotter 38 (plotter, a device for drawing a linear graph or a figure) and a printer 39 based on the signal input of the meshing transmission error, and also controls the motor control unit 24 and the H-axis position display unit via an interface 40. The drive control unit 41 controls the rotation speed display unit 42 and the torque display unit 43.
[0022]
Here, the above-described CPU 34 determines the minimum portion of the meshing transmission error (see the point of the arrangement error H = 0 shown in FIG. 3) which is a reference in the regular gear (a regular gear is used as the bevel gear 16 in FIGS. 1 and 2). It also serves as reference setting means for previously obtaining the tooth contact position (see curve a in FIG. 3) based on the relationship between the PMD and the mesh transmission error of the regular gear.
[0023]
The elements 13,21,25～33 shown in FIG. 2, measured gear meshing transmission erroneous difference at a plurality of positions relative to PMD direction (FIG. 1, using a measuring wheel in place of the normal gear as bevel gear 16 in FIG. 2) ( See curves b and c in FIG. 3).
[0024]
Further, the CPU 34 compares the meshing transmission error of the measuring gear measured by the measuring means 44 (see the curves b and c in FIG. 3) with the reference (see the curve a in FIG. 3) to determine the tooth contact position. Also serves as an evaluation means.
Next, a method for evaluating the contact of the bevel gear with teeth will be described.
[0025]
In a first step S1 shown in FIG. 4, a tooth contact position based on the relationship between the PMD of the regular gear and the mesh transmission error is determined.
That is, a regular gear is attached to the gear attachment portion 15 as the bevel gear 16, the pinion gear 23 is meshed with the regular gear, the motor 19 is driven to rotate the pinion gear 23, and the motor 11 is braked to load the regular gear. by actually measuring the meshing transmission erroneous difference at a plurality of positions relative to PMD direction by the measuring means 44 while biasing the obtaining curve a shown in FIG.
[0026]
The aforementioned servomotor 4 is used to move the regular gear used as the bevel gear 16 in the PMD direction. When the above-mentioned curve a is obtained, the minimum part (H = 0) of the meshing transmission error which is a reference for the regular gear can be naturally obtained. Here, the point of H = 0 can be obtained by the CPU 34 approximating the cubic curve.
Note that, instead of the method of actually measuring with a regular gear attached, reference data (theoretical value) corresponding to the curve a may be input to the CPU 34 in advance and stored in a storage unit such as a RAM.
[0027]
Then in the second step S2 shown in FIG. 4, measuring the difference erroneous meshing transmission at a plurality of positions relative to PMD direction in the measurement wheel.
That is, after removing the regular gear, a measuring gear is attached to the gear attaching portion 15 as the bevel gear 16, and meshing transmission is performed at a plurality of positions in the PMD direction by the measuring means 44 by the same method as the actual measuring method when the regular gear is attached. by actually measuring an erroneous difference obtain curve b or the curve c shown in FIG.
[0028]
Then in the third step S3 shown in FIG. 4, the mesh Goden our error characteristics with respect to PMD direction of the measured measured gear (see curve b, c in FIG. 3), meshing transmission error of the normal gear for PMD direction The characteristics (see curve a in FIG. 3 ) are compared by the CPU 34 to evaluate the quality of the tooth contact position.
[0029]
In FIG. 3, the curve b is depressed in the H-direction with respect to the curve a of the normal gear, so that the curve c is depressed in the H + direction with respect to the curve a. .
In FIG. 3, when the shift amount is small, the lap setting correction is executed, and when the shift amount is large, the gear cutting setting correction is executed, and the shift amount falls within an allowable range, and the gear noise is minimized or reduced. Then it is used as an OK product.
[0030]
Above required, according to the teeth per evaluation method of the bevel gear of the embodiment, first, at least serving as a reference minimum portion of the meshing transmission error in the regular gear (point see H = 0 in FIG. 3) is determined, following the meshing transmission erroneous difference at a plurality of positions relative to PMD direction in the measurement wheel (curve b in FIG. 3, c reference) was measured, (curve b in FIG. 3, reference c) meshing transmission error of the measured measured gear and above reference (point see H = 0 in FIG. 3) and is compared, not a Re without by the operator of the visual evaluation, such as in the conventional method because the magnitude of the amount of assessing tooth per position of the measuring wheel, There is an effect that the tooth contact can be qualitatively evaluated.
[0031]
In addition, since the tooth contact position (reference tooth contact position) based on the relationship between the PMD of the regular gear and the mesh transmission error (see curve a in FIG. 3) is obtained in advance, the minimum value of the mesh transmission error (for example, H = 0) Compared with the method of determining only the following point, there is an effect that the gear contact of the measurement gear can be qualitatively and more accurately evaluated.
[0032]
Further, according to the bevel gear tooth contact evaluation device of the above embodiment, the above-described reference setting means (see CPU 34) is at least the minimum part of the meshing transmission error which is the reference for the normal gear (see the point H = 0 in FIG. 3). ) is obtained, the measuring means 44 measures the meshing transmission erroneous difference at a plurality of positions in measured gear to either one direction in the PMD direction or GMD direction (see curve b, c in FIG. 3), evaluation means (CPU 34 references ) Is the meshing transmission error of the measuring gear measured by the measuring means 44 (see curves b and c in FIG. 3) and the reference (H = 0 in FIG. 3) set by the reference setting means (CPU 34). The point of contact of the measurement gear is evaluated by comparing the difference with the magnitude of the shift amount.
[0033]
As a result, there is an effect that the tooth contact can be qualitatively evaluated without using the conventional visual evaluation of the operator.
In the above embodiment, the regular gear and the measurement gear were moved in the PMD direction (H direction) to evaluate the tooth contact. However, the regular gear and the measurement gear were moved in the GMD direction (V direction) by the servo motor 9. It may be done to evaluate.
[0034]
In correspondence between the configuration of the present invention and the above-described embodiment,
The reference setting means of the present invention corresponds to the CPU 34 of the embodiment,
Similarly,
The measuring means corresponds to the measuring means 44 comprising the circuit elements 13, 21, 25 to 33,
The evaluation means corresponds to the CPU 34,
The bevel gear corresponds to the bevel gear 16,
The minimum portion of the meshing transmission error that is the reference for the regular gear corresponds to the misplacement H = 0 point,
The present invention is not limited only to the configuration of the above embodiment.
[Brief description of the drawings]
FIG. 1 is a plan view of an evaluation device used in a bevel gear tooth contact evaluation method of the present invention.
FIG. 2 is a control circuit block diagram of the evaluation device.
FIG. 3 is an explanatory diagram showing a measurement result of a mesh transmission error with respect to PMD in each bevel gear.
FIG. 4 is a process chart showing a bevel gear tooth contact evaluation method of the present invention.
FIG. 5 is an explanatory diagram of a pinion, a mount, and a distance.
FIG. 6 is an explanatory diagram of a gear, a mount, and a distance.
FIG. 7 is an explanatory diagram of a meshing contact mark.
[Explanation of symbols]
16: bevel gear 34: CPU (reference setting means, evaluation means)
44 ... Measurement means

Claims (3)

An evaluation method of bevel gear tooth contact,
Determine the minimum part of the meshing transmission error as a point where at least the arrangement error that is the reference in the regular gear becomes zero ,
Then measuring the difference erroneous meshing transmission with multiple number of location for either direction of the PMD direction or GMD direction in the measurement wheel,
A tooth contact evaluation method of a bevel gear for evaluating the tooth contact position by comparing the measured transmission error of the measured gear with the above reference. 2. The method according to claim 1, wherein a tooth contact position based on a relationship between the PMD and the mesh transmission error of the regular gear is determined in advance. An apparatus for evaluating bevel contact of a bevel gear,
Reference setting means for determining a minimum portion of the meshing transmission error as a point at which the arrangement error serving as a reference in at least the normal gear becomes zero ,
Measuring means for measuring the meshing transmission erroneous difference double the number of location for either direction of the PMD direction or GMD direction in the measurement wheel,
A bevel gear tooth contact evaluation device, comprising: evaluation means for evaluating the tooth contact position by comparing the measured meshing transmission error of the measurement gear with the reference.

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