JP2003175419A - Gear analysis method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gear analysis method capable of greatly decreasing the number of times of correction made for reducing vibration and gear noise. <P>SOLUTION: A manufactured gear is measured on the prescribed items of tooth form and tooth trace by a measuring machine. The measured value is Fourier-transformed. The Fourier transformed value is plotted on a bar graph, whereby which item of the gear measurement items is to be corrected is known. Then, a blade tool and facilities for machining are adjusted to manufacture the gear. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear analysis method effective for reducing pulsation (vibration) and gear noise caused by defects in gear processing equipment and cutting tools.

[0002]

2. Description of the Related Art Conventionally, when incorporating a new gear into a new model, a predetermined item of the produced gear was measured, an analyst analyzed this measurement data, and the gear was produced again with necessary corrections. After that, the gear is installed in the device and vibration measurement and actual vehicle sound pressure measurement are performed. The above analysis, correction, vibration and sound pressure measurement are repeated at least four times before mass production.

[0003]

In the prior art, it takes skill to determine the cause of vibration and gear noise from measured data, and the way of reading measured data varies from person to person.
The analysis result varies depending on the person. As a result, as described above, analysis, correction, vibration and sound pressure measurement are to be repeated many times.

[0004]

In order to solve the above-mentioned problems, the gear analysis method according to the present invention measures data for a predetermined item of the tooth profile and / or tooth trace of each tooth of the gear, and the measured value is measured. Is a pie chart (circle graph), Fourier transform is further performed using a predetermined Fourier series, the value obtained by this Fourier transform is represented in a bar graph, and the tooth to be corrected is determined from this graph.

The above-mentioned predetermined items are pressure angles for tooth profiles,
The amount of waviness, the amount of tooth tip correction, and the shape of a ball, and the amount of leaning, waviness, and crowning for tooth traces. Although it is not possible to visually judge which gear should be corrected by using a bar graph or pie chart for the numerical data of each item, Fourier transform does not mean that the converted numerical values are vibration data and gears. The degree of influence on the sound can be visually known.

Here, as shown in FIG. 1, the tooth profile refers to the shape measured from the root to the tip of one tooth, and the tooth trace is the line of intersection between the tooth surface and the pitch surface. Tooth width refers to the shape measured from top to bottom. As shown in FIG. 2, the pressure angle of the tooth profile means the angle between the radial line of the tooth profile and the tangent of the tooth profile at one point on the tooth surface.
The pressure angle error refers to the position shift on the tooth tip side within the pressure angle evaluation range of the tooth profile evaluation line. The amount of waviness is the distance between the line connecting the top and the line connecting the bottom, and the tooth tip correction amount is the distance from the intersection of the extension line of the tooth profile evaluation line and the theoretical outer diameter to the tooth tip correction range. And the ball shape is the amount of swelling. In addition, as shown in FIG. 3, the amount of tilt of the tooth trace is the amount by which the twist angle becomes + or −, and the amount of undulation is the line connecting the top and the line connecting the bottom. Is the distance between the measured gear width and the straight line that connects the top and bottom of the measured gear width, and is called the crowning amount.

Although it is necessary to select a Fourier series for the Fourier transform, the following series are selected in the present invention.

[Equation 2]

[0008]

First, in the present invention, predetermined items of the tooth profile and tooth trace of a manufactured gear are measured by using a measuring machine. The following (Table 1) shows actual measurement data on the pressure angle, the amount of undulation, the amount of tooth tip correction, and the ball shape of the tooth profile before correction.

[0009]

[Table 1]

The values obtained by Fourier-transforming the above-mentioned pressure angle, waviness amount, tooth tip correction amount, and ball shape of the tooth profile are shown in (Table 2) below.

[0011]

[Table 2]

FIG. 4 is a bar graph of the values of (Table 2), and FIG. 5 is a circle graph for each of the pressure angle, waviness amount, tooth tip correction amount, and ball shape. The pressure data is shown in FIG.

From the bar graph of FIG. 4, it can be seen that the pressure angle amplitude, waviness amplitude, and ball amplitude of the 13th tooth are abnormal values. Further, in FIG. 5, it can be seen from the circle graph showing the pressure angle in (a) that there is a deviation, and from the tooth tip correction amount in (c) and the ball shape in (d), the 13th tooth has periodicity. Is recognized. Furthermore, from the actual vehicle sound pressure data shown in FIG. 6, a sound pressure of 37 dB or more was recognized when the gear before correction was used.

Therefore, the cutting tool for machining the thirteenth tooth is adjusted so that the thirteenth periodicity is not recognized, actual measurement data is obtained for the gear manufactured with the adjusted cutting tool, and the Fourier-transformed value is obtained as described above. It shows in (Table 3). Further, FIG. 7 shows a bar graph of the Fourier transformed values, and FIG. 8 shows a circle graph for each of the pressure angle, waviness amount, tooth tip correction amount, and ball shape, and FIG. 9 shows actual vehicle sound pressure data. Is.

[0015]

[Table 3]

It can be seen from FIG. 7 that the periodicity is lost. It can be seen from FIG. 5 that there is uniformity. Furthermore, it can be seen from FIG. 9 that no gear noise exceeding 37 dB, which is the reference, is generated.

[0017]

As described above, according to the gear analysis method of the present invention, the actual measurement value of the gear shape is made into a circle graph (circle graph), further Fourier transformed, and a bar graph is made based on the converted value. Since it is created, it is possible to determine at first glance whether or not the tooth shape has periodicity, and which tooth should be corrected to reduce the gear noise and vibration.

Moreover, since the judgment can be made visually, the judgment is quicker, the analysis result does not vary from person to person, skill is not required, and the number of corrections is significantly smaller than in the conventional method, and the accuracy of the analysis can be improved. And speed up.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a tooth profile and a tooth trace of one tooth of a gear.

FIG. 2 is a diagram illustrating a pressure angle of a tooth profile, a waviness amount, a tooth tip correction amount, and a ball shape.

FIG. 3 is a diagram illustrating the amount of tilting, waviness, and crowning of the tooth trace.

FIG. 4 is a bar graph showing the result of Fourier analysis of the tooth profile of the gear before correction.

FIG. 5: Circle graph showing the tooth profile of the gear before correction (circle graph)

FIG. 6 Data of actual vehicle sound pressure before correction

FIG. 7 is a bar graph showing the result of Fourier analysis of the modified gear tooth profile.

FIG. 8 is a circle graph (circle graph) showing the modified gear tooth profile.

FIG. 9: Actual vehicle sound pressure data after correction

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshiyuki Takahashi             1907 Hirata Town, Suzuka City, Mie Prefecture Honda Motor Co., Ltd.             Suzuka Works Co., Ltd. (72) Inventor Hiroshi Okamoto             1907 Hirata Town, Suzuka City, Mie Prefecture Honda Motor Co., Ltd.             Suzuka Works Co., Ltd. (72) Inventor Akihiko Yokoyama             1907 Hirata Town, Suzuka City, Mie Prefecture Honda Motor Co., Ltd.             Suzuka Works Co., Ltd. F term (reference) 3C025 CC00

Claims (3)

[Claims] 1. Data is measured for a predetermined item of a tooth profile and / or a tooth trace of each tooth of a gear, the measured value is Fourier transformed using a predetermined Fourier series, and this Fourier transformed value is represented in a bar graph. , A gear analysis method characterized by determining a tooth to be corrected from this graph. 2. The gear analysis method according to claim 1, wherein
The predetermined items are a pressure angle, a waviness amount, a tooth tip correction amount, and a ball shape for a tooth profile, and a tilt amount for a tooth trace,
A gear analysis method characterized by the amount of waviness and the amount of crowning. 3. The gear analysis method according to claim 1, wherein
The gear analysis method, wherein the predetermined Fourier series is the following (Equation 1). [Equation 1]