JP2000146568A - Hub surface plane precision measuring instrument of disk wheel for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily measure the hub surface flatness of a small-sized disk wheel wherein the whole of a hub surface is not flat, obtain the hub surface flatness corresponding to an abutting surface fixing the disk wheel on the vehicle side, measure the characteristic value of step-difference amount or the like of a step-difference part, and display or print out the characteristic value and an uneven waveform. SOLUTION: The lower end of a sensor 15 is made to abut against the hub surface of a disk wheel, and the wheel is rotated together with a rotary table 1. Corresponding to protrusions 9A-9H of the hub surface, an uneven waveform 7A having eight peaks a rotation can be obtained. A plane which contains three high peaks 7A and a hub center hole 11 is set as a reference plane, inclination is corrected, a distance 20 from the reference plane is made the flatness of the hub surface, and operation is performed with a personal computer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an apparatus for measuring the flatness of a hub surface of a disk wheel for an automobile.

[0002]

2. Description of the Related Art A disc wheel for an automobile is set on a table and a probe is pressed against a disc flat portion (hub surface) of the disc wheel.
One of the tracing stylus and the disk wheel is rotated relative to the other by one turn, and the movement of the tracing stylus in the direction perpendicular to the surface (hub surface) of the disc flat part is measured by a measuring device linked to the stylus An automobile that measures data at a plurality of points during the one revolution and samples the data, processes the data, and removes a tilt component from the data to identify a value obtained by undulating a disk flat portion (hub surface) of a disk wheel. An undulation measuring device for a disk flat portion (hub surface) of a disk wheel is known from Japanese Patent Application Laid-Open No. Hei 7-198373.

In this measuring apparatus, as shown in FIG. 11, a measuring element, for example, an outer periphery of a stylus roller 3 is brought into contact with a disk flat portion (hub surface) 2a of a disk wheel 2 set on the rotating table 1, and the rotating table 1 is rotated. Is rotated to convert the vertical movement of the stylus roller (measurement element) 3 in the figure into an electric signal, and the electric signal is Fourier-transformed as the amount of swell, and the primary sine wave component is disc flat portion (hub surface) 2a. , And the true undulation amount (the amount of unevenness) is calculated.

FIG. 12 shows the undulation amount before the inclination component is removed, that is, before the inclination component is corrected, and is represented by the superposition of the primary sine wave signal component as the inclination component and the true undulation amount. FIG. 13 shows the undulation amount after the inclination component correction, that is, the true undulation amount.

As shown in FIG. 12, before the correction of the inclination component, the inclination component is superimposed on the true undulation amount of 0.05 mm, and the undulation amount is apparently 0.30 mm as a whole. After the inclination component is corrected, that is, after the inclination component (first-order sine wave component) is removed, the true undulation amount is only 0.05 mm as shown in FIG.

Although the true undulation amount of 0.05 mm is also called an unevenness amount, it is strictly called a parallelism, and means a difference between the maximum value and the minimum value of the undulation amount after the inclination component correction. In FIG. 12, reference numeral 4 denotes a gradient component (first-order sine wave component).
Is shown. In FIG. 13, reference numeral 5 corresponds to a reference plane to be described later.

[0007]

In the above prior art,
The parallelism of the hub surface of the disk wheel is measured using the straight line indicated by reference numeral 5 in FIG. 13 as a reference plane. The reference plane indicated by reference numeral 5 is obtained by performing a Fourier analysis on a signal obtained by measuring the unevenness (undulation) of the hub surface, and an average portion of the unevenness of the hub surface becomes the reference surface. I have.

[0008] The reference portion of the disk wheel is the hub surface on the vehicle side on which the disk wheel is to be mounted. A plane including the three points of the hub surface of the disc wheel which corresponds to the plane which is the vehicle-side hub surface should be used as a reference plane for measurement. The three points are the highest three points, and the plane including the three points (that is, the reference plane per three points) is preferably a plane including the center (axis) of the disk wheel.

As shown in FIG. 14, in the prior art, the amount of concavo-convex (parallelism) with respect to the reference plane indicated by reference numeral 5 is P
Although shown in _1, the amount of unevenness relative to the reference plane 6 per three (parallelism) becomes a value different from the P ₂ becomes, P _1, P
There was a problem that it was not practical with ₁ . It is meaningless to measure the depth of a valley that does not contact the hub surface on the vehicle side. Reference numeral 7 denotes a curve based on data of unevenness (undulation).

In a disk wheel having a flat mounting surface, such as a disk wheel for a large vehicle, the curve 7 is continuous over one rotation of the wheel. Is as small as, for example, 0.07 mm or less. Therefore, it is necessary to increase the sensitivity of the sensor for measuring the unevenness of the hub surface, and as a result, the dimension measurement range of the sensor is reduced. In addition, in some disc wheels for small vehicles, the hub surface, which is the mounting surface, is not entirely flat, and may not be flat due to design requirements.

In such a wheel, the change in the amount of irregularities (sensor signal) measured by the sensor is as shown in FIG.
A non-continuous intermittent amount of 7A. In such a case, it is impossible to apply the above conventional technique, and the three points P
_1, P _2, it is preferable to calculate the amount of such flatness relative to the third reference plane 6A per points hitting P _3.

As described above, there is also a problem that the above-mentioned conventional technology may not be applied to a disc wheel for a small vehicle. Accordingly, it is a first object of the present invention to provide an apparatus for measuring the plane accuracy of a hub surface of a disc wheel for an automobile, which can solve such a problem.

Further, the disc wheel for a small vehicle has an outer contact surface and an inner contact surface which correspond to a hub surface on the vehicle side when the disc wheel is mounted on a vehicle, and the outer contact surface is called a hub surface of the disc wheel. The inner contact surface is referred to as an inner pad portion or a step portion of the disc wheel.

According to the number of bolt holes, design, etc., the number of outer contact surfaces is 4, 6,
8,10,12 places, 1,4,6,8
FIG. 16 illustrates eight outside locations and one inside location. 2 is a disk wheel, 8 is four bolt holes for attaching the disk wheel 2 to the vehicle,
9A to 9H are outer contact surfaces (hub surfaces), 10 is inner contact surfaces (inner pad portions or step portions), 11 is a hub hole,
Reference numeral 12 denotes a hub surface in a broad sense including both the outer contact surfaces 9A to 9H and the inner contact surface 10. Reference numeral 13 denotes a collet chuck for fixing the disk wheel 2 to the rotary table 1.

Incidentally, in a disk wheel having a stepped portion 10 to be distinguished from the hub surfaces 9A to 9H, it is necessary to measure the dimension of the stepped portion between the hub surface and the stepped portion, the degree of parallelism, and the like, and to determine whether or not it is within the standard. However, the above-mentioned conventional technique does not suggest anything about a technique for measuring these.

Therefore, the present invention provides a hub surface 9A to 9A in a narrow sense.
A second object of the present invention is to provide a measuring device capable of measuring a step amount between 9H and the step portion 10 and the like. In FIG. 16, the hatchings provided on the hub surfaces 9A to 9H and the step portion 10 are not meant to be cross-sectional, but are for clearly indicating these portions.

[0017]

In order to achieve the first object, the invention of claim 1 is directed to measuring the flatness of a hub surface which is an outer contact surface of a disk wheel. In a measuring device in which a sensor for measuring unevenness and a disk wheel are relatively rotated, a plane that hits the hub surface at three points, and a plane formed by these three points and each apex angle is 90 ° or less, A hub surface flatness measuring apparatus for a disk wheel for an automobile, wherein a flatness of a hub surface is calculated based on a distance from the reference surface.

In order to achieve the first and second objects, a second aspect of the present invention is the hub surface flatness measuring apparatus for a vehicle disk wheel according to the first aspect, wherein the hub surface is an outer contact surface. And automatically measure the unevenness of the step portion which is the inner contact surface, perform the inclination correction of the hub surface by the calculation means, and display the measurement results of the characteristic values such as flatness, step amount, etc. is there.

According to a third aspect of the present invention, in the apparatus for measuring flatness of a hub surface of an automobile disk wheel according to the second aspect, a waveform of the unevenness and a measurement result of the characteristic value are printed out. Things.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described with reference to the drawings. 1 to 3, a turntable 1 is a DD motor 1 having an angle encoder.
4, the rotation angle α is determined by the sensor 15
Is taken into the personal computer 16 which takes in and calculates the signal.

The contact 15A at the lower end of the sensor 15 is urged downward by a spring 15B to abut against the hub surfaces 9A to 9H, which are the outer contact surfaces of the disk wheel 2, and the amount of vertical movement is incorporated into the sensor. The magnetic scale 15C converts the electric signal into an electric signal. The magnetic scale is, for example, a commercially available SONY
By using the Magnescale DT512P / LT11, an error of 0.006 mm or less can be suppressed with respect to a movement amount of 12 mm.

When measurement conditions are input to the sensor moving device for each disk wheel name in advance and the wheel name is selected and activated, the sensor 15 controls the motor 17 for vertical movement and the motor 18 for radial movement. With the sensor moving device provided, hub surfaces 9A to 9H which are outer contact surfaces
Is selectively brought into contact with the step portions 10A to 10D which are inner contact surfaces. As shown in FIG. 4C, the contact 15A of the sensor has a semicylindrical shape with a lower end of R5 mm and a width B of 10 mm, and its generatrix direction (direction of width B) is the radius of the hub surfaces 9A to 9H. It is installed facing the direction indicated by reference numeral C in FIG. The radial dimension indicated by C is about 3 to 10 mm in a small disk wheel. Reference numeral 15D denotes a key for preventing rotation of the contact 15A.

1 and 2, the contact 15A of the sensor 15 is brought into contact with the hub surfaces 9A to 9H, the rotary table 1 is rotated by the DD motor 14, and the disk wheel 2 as a work is simultaneously moved in a certain direction. 4D, the magnetic scale 15C of the sensor 15 has A to A shown in FIG.
An H signal waveform is obtained. A to H are 9A to 9 respectively.
H.

This sensor signal is calculated by the personal computer 16 and is calculated by the software shown in FIGS. Step 11
At 3, a hub plane reference plane including three peak points is determined. In step 101, X, Y and Z are converted into three-dimensional coordinates based on the measured height H of the hub surface and the radius R.

Each of the peak values of the hub surface is divided into eight blocks A, B,..., H of contact surfaces (convex portions) 9A to 9H (step 103). The peak point of each block determined in step 105, the highest point of the first point Ps ₁ (step 107).

The highest point in the semicircular width opposite to the first point is P
It s ₂ to (step 109). And Ps ₃ highest point of from between Ps ₁ and the diagonal point Ps ₂ (Step 11
1).

A plane including the three points Ps ₁ , Ps ₂ and Ps ₃ is determined as a hub plane reference plane (reference plane) (step 11).
3). In FIG. 4D, the vertices of the sections B, D, and G are three
Corresponds to a point.

Thus, the obtained reference plane includes the center (axis) of the disk wheel. Based on the obtained radiation vector of the reference plane, coordinate conversion is performed in step 115 to correct the inclination angle, and in step 118, the flatness (maximum value from the reference plane) of the hub surface is obtained.

FIG. 4E shows a reference plane 6B whose inclination has been corrected.
20 is the flatness of the hub surface. Next, FIG.
In FIG. 4, the position of the sensor 15 is moved to the steps 10A to 10D, the disk wheel 2 is rotated, and the measurement data of the steps is converted into three-dimensional coordinates (step 119), and the coordinates are converted to the reference coordinate system of the hub surface. (Step 121), the block is divided into four blocks (Step 123), the peak point of each block is obtained (Step 125), and the level difference is obtained (Step 127).

In steps 129 to 145, the flatness of the step is obtained. The step flatness | Zd '| max is shown in FIG. 5B. Further, in step 147, the parallelism of the step portion is obtained (see FIG. 5C and FIG. 9). When the number of surfaces per hub surface is different from that in this example, calculation is performed in the same way.

The measurement calculation result of the characteristic value and the uneven waveform thus obtained are displayed on a display (CRT) 30 in FIG. 3 or printed out by a printer 31 as required.
In addition, in FIG. 5, as shown in FIG.
The distance [minimum value to maximum value] of the distance from the to the maximum value of each peak of the step portion is defined as the step amount. In addition, as shown in FIG. 3B, a surface including the top three points among the highest values of the peaks from the uneven waveform of the step portion is set as the step portion reference surface (however, a triangle formed by these three points is included in the triangle). The condition of the reference plane is that the center axis of the hub hole is included). Of the distances from the step reference plane to the highest point of each step, the maximum value is defined as the step flatness (FIG. 5B).

The [maximum value-minimum value] of the distance from the hub surface reference surface to the step reference surface is defined as the step portion parallelism.
The waveform to be displayed or printed out should preferably be the waveform of raw data as measured or the waveform after calculation, and the software of the personal computer 16 should be used so that a list of the measurement conditions and the various characteristics described above is output. Is configured.

In the prior art shown in FIG. 11, since the stylus roller 3 rotates at the time of measurement, the effect of eccentricity and roundness of the stylus roller 3 is mixed into the measurement data to cause an error (noise). However, in the embodiment, there is an advantage that such an error is not mixed at all because of the shape of the contact 15A.

FIG. 10 shows an embodiment in which the mounting structure of the disk wheel 2 to the turntable 1 is different from that of FIG. 4. In FIG. 4, the surface of the hat (the lower surface in the figure) of the disk wheel 2 abuts on the upper surface of the turntable 1. However, in FIG. 10, a plurality of pins 1a projecting from the upper surface of the turntable 1 receive the surface (the lower surface in the figure) of the disk wheel 2. In FIG. 10, there is an advantage that the error of the measurement data of the plane accuracy can be reduced because the accuracy of the hat portion is not affected (because the hub surface becomes more horizontal) as compared with FIG.

[0035]

Since the hub surface flatness measuring apparatus of the present invention is constructed as described above, it is possible to measure the flatness of a disk wheel for a small vehicle in which the entire hub surface is not flat like a disk wheel for a large vehicle. . In addition, since the hub surface reference surface includes the center of the hub center hole and is a three-point contact surface, there is an advantage that flatness can be obtained under the best condition close to the condition of attachment to the vehicle.

According to the second and third aspects of the present invention, various characteristic values and uneven waveforms related to the step portion can also be confirmed, which is useful as a tool for quality control in producing a disk wheel and vibration analysis of a vehicle.

[Brief description of the drawings]

FIG. 1 is a front view of a mechanism according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a portion A in FIG.

FIG. 3 is a block diagram of a main part of the embodiment of the present invention.

4A and 4B are views for explaining the present invention, wherein FIG. 4A is a front view showing an example of a mounting method of a disk wheel, FIG. 4B is a partial plan view of the disk wheel, and FIG. FIG. 2D is a partially enlarged perspective view illustrating a contact of a contacting sensor, and FIG.
(E) is a diagram of an uneven waveform corrected for inclination.

5A is a diagram illustrating a step difference amount, FIG. 5B is a diagram illustrating a step portion flatness, and FIG. 5C is a diagram illustrating a step portion parallelism.

FIG. 6 is a flowchart.

FIG. 7 is a flowchart.

FIG. 8 is a flowchart.

FIG. 9 is a flowchart.

FIG. 10 is a schematic front view showing a disk wheel mounting structure according to another embodiment of the present invention.

FIG. 11 is a front view showing a part of a conventional mechanism.

FIG. 12 is a diagram illustrating the amount of undulation before correction of a tilt component according to the related art.

FIG. 13 is a diagram illustrating the amount of undulation after correction of a tilt component according to the related art.

FIG. 14 is a diagram for explaining a difference in hub surface flatness after inclination correction according to the related art and the present invention.

FIG. 15 is a diagram illustrating an unevenness waveform when the unevenness measurement waveform on the hub surface is not continuous but is intermittent.

FIG. 16 is a view of a disk wheel, (a) is a plan view,
(B) is a partial longitudinal front view in a state where the disk wheel is attached to the rotary table.

[Explanation of symbols]

 Reference Signs List 1 rotary table 2 disk wheel 9A-9H hub surface 10A-10D step 15 sensor 16 personal computer 30 CRT (display) 31 printer

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2F062 AA04 AA43 AA55 BB07 BC42 CC30 DD17 DD22 DD35 EE01 EE62 FF17 FF25 GG65 HH05 HH16 HH21 JJ01 JJ08 LL09 LL12 2F069 AA04 AA54 AA99 BB27 GG27 GG27 GG27 GG27 GG27 GG27 LL04 MM21 MM23 MM32 MM34 NN09 NN12 QQ05 QQ10 QQ13

Claims (3)

[Claims] 1. A measuring device for rotating a disk wheel and a sensor for measuring unevenness of a hub surface in order to measure the planar accuracy of a hub surface as an outer contact surface of the disk wheel. A plane that hits the hub surface at three points, and a plane whose apex angle of each triangle of these three points is 90 ° or less is used as a reference plane, and the flatness of the hub surface is calculated based on the distance from this reference plane. An apparatus for measuring the flatness of a hub surface of an automobile disk wheel. 2. The unevenness of the hub surface as the outer contact surface and the step portion as the inner contact surface is automatically measured, and the inclination of the hub surface is corrected by the calculating means to obtain the characteristic values such as flatness and step amount. 2. The apparatus according to claim 1, wherein the measurement results are displayed. 3. The apparatus according to claim 2, wherein a waveform of the unevenness and a measurement result of the characteristic value are printed out.