JPH0625705B2 - Gear dent value measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a dent value measuring device for a gear used in an engine or a transmission of an automobile.

[Prior Art] Next, a method for measuring a dent value will be described with reference to FIG.

In FIG. 3, 1 is a work, 2 is a master gear, 3 is a rotary shaft of the work 1, 4 is a rotary shaft of the master gear 2, and the master gear 2 is a work 1
, And rotate the work 1. The change in the distance between the rotary shaft 3 and the rotary shaft 4 at this time is read by the displacement sensor, and this data is processed to calculate the dent value.

Next, the dent value will be described with reference to FIG.

In FIG. 4, the tooth shake component is removed for the sake of simplicity.

The convex portion in the central portion of FIG. 4 is generated because the work 1 has a dent or the like.

As shown in FIG. 4, the dent value is calculated by the difference between the maximum value and the minimum value for each tooth.

In the conventional method, a dent value is obtained by time-sequentially processing a series of data obtained by sampling the displacement sensor at regular intervals. That is, a method of finding the maximum point and the minimum point one after another is adopted.

Next, the actual waveform diagram of FIG. 4 is shown in FIG.

As is clear from FIG. 5, the actual waveform diagram has complicated irregularities. This is because the tooth cycle changes due to the non-ideal tooth profile of the workpiece 1 and the irregular variations due to the roughness of the surface of the workpiece 1 are added.

[Problems to be Solved by the Invention] In order to change the waveform of FIG. 5 to that of FIG. 4, filtering and software processing must be performed.

If such a process is not performed, portions such as A and B in FIG. 5 are also recognized as the maximum / minimum values, so the reported dent value 12 becomes smaller than the actual dent value 11.

The present invention processes displacement sensor data and calculates a dent value, paying attention to the fact that the waveform of FIG. 5 has the following characteristics regardless of the degree of unevenness.

(A) If two arbitrary tooth length sections are taken, there are at least one maximum point and one minimum point.

(B) Even when the tooth runout component is added, the local minimum values of the adjacent teeth change slowly, so there is almost no change.

That is, with the rotation of the work 1, a tooth signal generator with a tooth profile is provided, the maximum value and the minimum value of the data of the section divided at this timing are obtained, and the difference is adopted as the dent value, Each time, the dents of all teeth are measured by shifting this section.

[Means for Solving the Problem] In order to achieve this object, in the present invention, the first rotating shaft 3 is fixed, the work 1 rotating at a constant speed, and the second rotating shaft meshed with the work 1. 4 has a structure in which 4 moves toward the first rotation shaft 3 side, a tooth signal generator 5 that generates a tooth signal 8 at a timing corresponding to the teeth of the work 1 in accordance with the rotation of the work 1, and the master gear 2. The displacement sensor 6 which detects the displacement amount and outputs a displacement signal 9, and the tooth signal 8 and the displacement signal 9 are input, and the maximum value and the minimum value of the displacement of the two tooth sections of the work 1 are obtained, and the difference is the dent value. And

Next, a block diagram of a gear dent measuring device according to the present invention will be described with reference to FIG.

5 is a tooth signal generator, 6 is a displacement sensor, 7 is measuring means, 1
0A is a motor, 10B is a spring, 10C is a bearing,
The other parts are the same as in FIG.

[Operation] In FIG. 1, the rotary shaft 3 of the work 1 is fixed, and the work 1
Rotates at a constant speed.

The master gear 2 is meshed with the work 1, and the rotary shaft 4 of the master gear 2 is a spring 10B and a bearing 10C, and the rotary shaft 3 of the work 1
A structure that can move in the direction of.

The displacement sensor 6 detects the displacement amount of the parent gear 2 and outputs the displacement signal 9
Is sent to the measuring means 7.

The tooth signal generator 5 generates the tooth signal 8 at a timing corresponding to the teeth of the work 1 according to the rotation of the work 1 by the proximity switch.

The measuring means 7 inputs the tooth signal 8 and the displacement signal 9 and calculates the dent value of the work 1.

Next, a flow chart for calculating the dent value by the measuring means 7 in FIG. 1 will be described with reference to FIG.

In step 21, as the main register, the maximum value is 1,
It has a minimum value 1, a maximum value 2 and a minimum value 2. These are all initialized.

In step 22, the tooth signal 8 is read, and if the tooth signal 8 is a rising edge, the process proceeds to step 24.

The case where the tooth signal 8 is the rising edge means that the previous value is "0" and this time becomes "1".

If the tooth signal 8 is not the rising edge, the process proceeds to step 23.

In step 23, the displacement signal 9 is read, and if the value of the displacement signal 9 is larger than the maximum value "1", then the maximum value "1" is obtained.
Is updated, and if it is smaller than the minimum value “1”, the minimum value “1” is updated. After that, the process returns to step 22.

When step 22 and step 23 are repeated, the tooth signal 8 rises as the work 1 rotates.

In step 24, when the tooth signal 8 rises, the dent value is calculated by the following equation.

Scratch value = MAX × [maximum value 1, maximum value 2] −MIN [minimum value 1, minimum value 2] where MAX [A, B] means the larger value of A and B, and MIN [ A, B] means the smaller one of A and B.

In step 25, the maximum value of 1 is prepared in preparation for the next tooth measurement.
Is set to the maximum value 2 and the minimum value 1 is set to the minimum value 2.

In step 26, the maximum value 1 and the minimum value 1 are initialized.

Steps 21 to 26 are repeated until the work 1 makes one rotation, and all the teeth of the work 1 are measured.

[Effects of the Invention] According to the present invention, a tooth signal generator based on a tooth profile is provided along with the rotation of a workpiece, the maximum value and the minimum value of the data in the section divided at this timing are obtained, and the difference between them is set. Since this is adopted as a scratch value and the hit marks of all teeth are measured by shifting this section for each tooth, an error such as division does not occur.

In addition, it is less susceptible to the surface roughness and shape error of the work, and repeatable measurement can be performed with good accuracy.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a gear dent measuring device according to the present invention,
FIG. 2 is a flow chart of the dent value calculation by the measuring means 7 of FIG. 1, FIG. 3 is an explanatory diagram of dent value measurement, and FIG.
The ideal waveform diagram of the displacement according to the figure, FIG. 5 is the actual waveform diagram of FIG. 1 ... Work, 2 ... Parent gear, 3 ... Rotation axis of work 1, 4 ... Rotation axis of parent gear 2, 5 ... Tooth signal generator, 6
...... Displacement sensor, 7 ...... Measuring means, 8 ...... Tooth signal, 9 ...
… Displacement signal, 10A …… Motor, 10B …… Spring, 10
C ... Bearing.

Claims (1)

[Claims] 1. A first rotating shaft (3) is fixed, a work (1) rotating at a constant speed is meshed with the work (1), and a second rotating shaft (4) is a first rotating shaft. The master gear (2) that moves to the (3) side and the tooth signal generator (5) that generates the tooth signal (8) at the timing corresponding to the teeth of the work (1) according to the rotation of the work (1). , The displacement sensor (6) that detects the amount of displacement of the parent gear (2) and outputs the displacement signal (9), and the tooth signal (8) and the displacement signal (9) as input, 2 of the work (1)
A dent value measuring device for a gear, characterized in that the maximum value and the minimum value of the displacement of a tooth section are obtained, and the dent value of all teeth is measured by shifting this section for each tooth.