JPH0812066B2 - Vertical runout measurement method for automobile wheels - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a vertical deflection measurement method for an automobile wheel, which measures the vertical deflection of the automobile wheel as the deflection of the bead seat from the center of the inner diameter of the hub hole. is there.

[Conventional technology]

Conventionally, a method for measuring vertical runout of an automobile wheel uses a measuring device as shown in FIG. 5 (a), and mechanically uses a hub hole fixing jig 19 arranged at the center of rotation of a rotary table 25 to mechanically drive the automobile wheel W. The inner surface 4 of the hub hole is fixed, and the measurement terminals 23 and 23 of the vertical runout measuring jigs 22 and 22 are brought into contact with the bead seat portion 11 of the vehicle wheel W that rotates while rotating the rotary table 25, respectively. The vertical runout amount of the vehicle wheel was measured by obtaining the amount of movement of the vertical runout measurement jigs 22 and 22 with the length measuring devices 24 and 24.

As the means for fixing the inner surface 4 of the hub hole, the collet chuck 20 shown in FIG. 5B or the tapered cone 21 shown in FIG. 5C was used.

[Problems to be solved by the invention]

The method of measuring the vertical runout by mechanically fixing the hub hole of the automobile wheel using the collet chuck 20 or the taper cone 21 as the fixing jig 19 as described above has the following problems.

When fixing the hub of an automobile wheel using the taper cone 21, the taper surface of the taper cone 21 is machined in a perfect circle, whereas the hub hole of the car wheel is machined by pressing. It is not a perfect circle and there are variations.

Therefore, even if the hub hole of an automobile wheel is put in a taper cone and fixed, it is difficult to always fix it in a stable position, and the deviation amount of this fixed position becomes the variation of the vertical deflection measured value as it is. It was appearing.

Further, when the taper surface of the taper cone 21 is scratched or adhered, it is difficult to always fix the hub hole of the automobile wheel at a stable position even if the hub hole is put in the taper cone.

Also when fixing the vehicle wheel using the collet chuck 20, it is difficult to fix the wheel at a stable position as described above.

The vertical runout of an automobile wheel measured by the conventional method is not the true runout of the wheel, but the amount of runout obtained from the difference in the distance from the center of the turntable to the bead seat of the automobile wheel. In the case where the table itself is shaken, only the shake amount in which the shake of the rotary table is combined with the true shake of the vehicle wheel can be measured, and the true shake amount cannot be measured.

(B) Since there are various hub hole inner diameters for automobile wheels depending on the vehicle model, the collet chuck 20 can
In this case, it is necessary to prepare for each type of hub hole inner diameter, and it is necessary to replace the taper cone and collet chuck to be used every time the type of automobile wheel to be measured changes. I didn't like it.

When using the hacolet chuck 20, the collet chuck is installed at the center of rotation of the rotating table, so the rotating table requires a rotating mechanism, an opening / closing mechanism for the collet chuck, and a replacement mechanism to accommodate various hub hole inner diameters. Therefore, the turntable had a very complicated structure.

Further, even when a tapered cone is used, a rotary cone has a very complicated structure because an elevation mechanism for the tapered cone and the like are required to cope with variations in the inner diameter of the hub hole.

Whether it uses a Nicolet chuck or a taper cone, it has a replaceable structure so that it can be used for various hub hole inner diameters of automobile wheels. It was necessary to loosen the fit, and if the fit was loosened, play was generated there, causing a measurement error.

[Means for solving problems]

The present invention has been made in order to solve the above-mentioned problems, and is for an automobile mounted on a turntable corresponding to a rotation angle ωt that divides one rotation of the turntable into arbitrary equal parts. By measuring the distance lt from the inner surface of the wheel hub hole to the center of the turntable, the measurement point Pt (lt × cosωt, lt
Xsin ωt), and regard the center of the largest circle that can be drawn in the area surrounded by the measurement points of this arbitrary fraction as the center of the inner diameter of the hub hole of the automobile wheel that is placed on the rotating table and rotates.
The distance Lt from the bead seat portion of the automobile wheel to the rotary base rotation center corresponding to the rotation angle ωt measured simultaneously or separately with the measurement of the distance lt from the inner surface of the hub hole to the rotary base rotation center is Is converted by the calculation unit into the distance from the center of the maximum circle drawn in the area surrounded by the measurement points Pt of arbitrary equal fractions obtained by, and the difference between the maximum value and the minimum value of this distance is The present invention provides a method for measuring vertical deflection of an automobile wheel, which is characterized in that it is obtained as a vertical deflection amount.

[Action]

By measuring the distance from the inner surface of the hub hole of the automobile wheel mounted on the rotating table to the center of rotation of the rotating table as described above over the entire circumference of the inner surface of the hub hole, it is possible to draw in the inner surface of the hub hole. Find the circle, measure the distance from the center of the circle to the bead seat of the automobile wheel above the entire circumference of the bead seat, and find the difference between the maximum and minimum values of that distance. The vertical deflection amount of is detected.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a rotary base 2 having an upper surface magnetized or a flat surface having a permanent magnet arranged on the upper surface is rotatably arranged on a machine base 1, and the rotary base 2 is provided with a gear or other transmission means. A rotation angle meter 3 for measuring the rotation angle of the turntable 2 is provided via the.

The vehicle wheel W is placed on the turntable 2 and fixed by magnetic force.

The rotary table 2 is rotated manually or by using a driving means, and the measurement terminal 6 of the hub hole inner surface measuring jig 5 is pressed against the hub hole inner surface 4 of the vehicle wheel W rotating together with the rotary table 2.

The measuring terminal 6 is constantly pressed against the inner surface 4 of the hub hole, and the amount of movement thereof is measured by the length measuring device 7.

At this time, one rotation of the turntable 2 is divided into equal parts in advance, and each time the turntable 2 is rotated by the equally divided equally divided angle ω, the length is measured by the length measuring instrument 7 as shown in FIG. Take in the data to the calculation section.

As shown in FIG. 3 (a), the computing unit obtains a measurement point Pt (lt × cosωt, lt × sinωt) of XY coordinates obtained from the rotation center 13 of the turntable 2 for each equal angle ω. By measuring the entire circumference of the hub hole inner surface 4, the hub hole inner surface shape 12 indicating the position of the hub hole inner surface 4 with respect to the rotation center 13 of the rotary table 2 is obtained.

As shown in Fig. 3 (b), the largest circle 15 that can be drawn in the area surrounded by the hub hole inner surface shape 12 determined above.
And find the center 16 of this circle 15.

Simultaneously with or after the measurement of the inner surface 4 of the hub hole, as shown in FIG. 1, the measurement terminal 9 of the vertical runout jig 8 is pressed against the bead seat portion 11 of the rotating vehicle wheel 1.

The measuring terminal 9 of the vertical deflection measuring jig 8 is always the bead seat 11
It is pressed against and the amount of movement is measured by the length measuring device 10.

Similar to the measurement of the inner surface 4 of the hub hole, every time the rotary table 2 is rotated by an equal angle ω obtained by dividing one rotation of the rotary table 2 in advance, it is measured by the length measuring instrument 10 as shown in FIG. Imported data into the calculation unit.

In the calculation unit, as shown in FIG. 4, the curve 17 showing the change in the distance Lt from the rotation center of the rotary table 2 to the bead seat 11 obtained from the data taken from the length measuring instrument Largest circle that can be drawn in the area surrounded by shape 12
Convert to the distance from the center 16 of 15 to the bead seat 11.

 A curve 18 shows the distance change amount after the conversion.

The difference between the maximum value and the minimum value is obtained from the curve 18 showing the distance change amount after conversion obtained as described above, and this difference is measured as the vertical deflection amount of the automobile wheel.

By the way, in the above embodiment, the rotation of the rotary table 2 is described as being divided into equal parts, but theoretically, the smaller the equal angle ω, the more accurate the measurement can be made. Considering the processing method and processing accuracy of automobile wheels, 250 to 500 equal parts are suitable.

Also, when the data from the length-measuring devices 7 and 19 for measuring the movement amount of the hub inner side surface measurement jig 5 and the vertical shake measurement jig 8 is taken into the calculation section, if the data is filtered electrically or mechanically, More precise measurement is possible.

Further, the vertical deflection amount obtained as described above can be displayed on a CTR screen, recorded on a DISC or a printer as shown in FIG. 2, or connected to various output devices.

〔The invention's effect〕

As described above, the present invention does not mechanically fix the inner surface of the hub hole of the automobile wheel with a collet chuck, a taper cone, or the like, but obtains the shape of the inner side of the hub hole and draws the largest circle in the area. Since it is configured to perform vertical runout measurement by determining the center of, the fixing error that occurs when mechanically fixing the inside of the hub hole is eliminated,
The reproducibility of vertical shake measurement is improved.

Since it is not necessary to mechanically fix the hub hole, it is not necessary to provide a fixing jig such as a collet chuck or a taper cone for each type of automobile wheel, which improves the economical efficiency and requires replacement. No hassle.

Also, since it is not necessary to replace the collet chuck or the taper cone, the mechanism of the rotary table is greatly simplified, and the measurement error due to the play of the jig, which has been generated in the past to easily replace the fixing jig, is eliminated. Disappeared
The measurement accuracy is greatly improved.

Further, it is an invention having an excellent effect that a true shake of an automobile wheel can be measured irrespective of the shake of the rotary table itself, that is, stable and accurate measurement and economical measurement can be performed.

[Brief description of drawings]

FIGS. 1 to 4 show an embodiment of the present invention, and FIG. 1 is a schematic configuration diagram of a vertical runout measuring apparatus using a vertical runout measuring method for an automobile wheel of the present invention, and FIG. 2 is a vertical runout. FIG. 3A is a block diagram showing the relationship between the measuring device, the arithmetic unit, and the output device, and FIG. 3A is an explanatory view showing the relationship between the rotation angle ω and the distance l used when measuring the shape of the inner surface of the hub hole. Fig. 3 (b) is an explanatory view showing the relationship between the maximum circle and the center of the circle that can be obtained in the area of the inner surface of the hub hole, and Fig. 4 is the distance from the rotation center of the rotary table to the bead seat and the hub. A graph showing the relationship between the distance from the center of the inner surface of the hole to the bead seat, FIG. 5 (a)
Is a schematic configuration diagram of a conventional vertical deflection measuring device, FIG. 5 (b)
Is an explanatory view of a collet chuck, which is a jig for fixing the inside surface of the hub hole, which is used in the conventional vertical runout measuring device, and FIG. 5C shows the fixing of the inside surface of the hub hole used in the conventional vertical runout measuring device. It is explanatory drawing of the taper cone which is a jig. 1 ... Machine stand 2 ... Rotation stand 3 ... Rotation angle meter 4 ... Hub hole inner surface 5 ... Hub hole inner surface measuring jig 7, 10 ... Length measuring machine 8 ... Vertical runout measuring jig 11 ... … Bead seat 12 …… Inside hub shape 13 …… Rotation center of rotation base 15 …… Maximum circle 16 …… Center of maximum circle 17 …… Indicates change in distance from rotation center of rotation base to bead seat Curve 18 …… Curve showing the change in the distance from the center of the inner surface of the hub hole to the bead seat 19 …… Hub hole fixing jig 20 …… Collet chuck 21 …… Tapered cone

Claims (1)

[Claims] Claim: What is claimed is: 1. One rotation of the turntable is divided into equal parts, and from the inner surface of the hub hole of the vehicle wheel mounted on the turntable to the center of the turntable, which corresponds to the equally divided rotation angle ωt. The distance lt and the distance Lt from the bead seat to the center of the turntable are measured by the measuring means, and the calculation unit calculates the distance Lt from the distance lt at the measurement point Pt (lt × cosωt, lt × sinωt). A vehicle wheel characterized by being converted into a distance from the center of the maximum circle inscribed in the enclosed area, and the difference between the maximum value and the minimum value of the converted distance being obtained as the vertical deflection amount of the vehicle wheel. Vertical deflection measurement method.