JPS61217712A - Apparatus for measuring deflection of disc wheel in radius direction for vehicle - Google Patents

Abstract

PURPOSE:To measure the deflection of a bead seat in the radius direction without including an error caused by the deflection of a disc wheel in the axial direction, by pressing the guide part, which is integrally provided to a contact maker made movable to the rotary axis direction of the disc wheel, to the outer end surface of the flange of the disc wheel. CONSTITUTION:When a disc wheel W is set onto a wheel mount plate 11 and the chambers of cylinders 6a, 6b are opened, arms 4a, 4b are revolved forwardly by the action of compression springs 7a, 7b. That is, by the coil springs 7a, 7b, not only a contact maker 1a and a guide part 2a are pressed to a bead seat B and a flange outer end surface F0 but also a contact maker 1b and a guide part 2b are pressed to a bead seat B' and a flange outer end surface F0'. When rotation around a rotary axis Z is applied to the wheel W in this state, the contact makers 1a, 1b are displaced corresponding to the deflection of the bead seats B, B' in the radius direction in a state respectively holding predetermined distances from the flange outer end surfaces F0, F0' and the displacement amounts thereof are detected by change sensors and average by an operator 22 to be displayed on a display device 23.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a device for measuring radial runout of a disc wheel for a vehicle such as an automobile.

<Recurring technology> Vehicle disc wheels must keep the radial runout of the bead seat portion relative to the center of rotation within a predetermined value, and this check is performed on all products.

This runout is measured by attaching a disk wheel to a rotating shaft and rotating it, applying a contact to a bead seat, and detecting the amount of movement in the radial direction. During this measurement, if the position of the contact is fixed in the direction of the rotation axis,
If there is axial runout in the disc wheel, the bead seat usually does not form a cylindrical surface parallel to the rotation axis, but a conical surface, so its generatrix is θ with the rotation axis. In the case of an angle, an error such as ΔE≠ΔL−tan θ will be included in the radial runout measurement value, where ΔL is the axial runout of the disc wheel.

In order to deal with the above phenomenon, the special public
As shown in No. 82, a contact element that simultaneously contacts the bead seat of the disc wheel and the inward facing surface of the flange adjacent thereto is used, and the contact position of the contact element with the bead seat, that is, the radius The measurement position of the directional runout was regulated so that it was always at a constant distance from the inwardly facing surface of the flange.

<Problems to be Solved by the Invention> However, according to this measurement method, the inner surface of the flange and the bead seat are generally connected at the R surface as shown in FIG. It varies depending on the type of wheel, and if the contactor is not changed according to these 8 dimensions, for example, the curvature connecting the contact part C with the inner surface of the flange of the contactor and the tip end of the contactor will be smaller than the 8 dimensions. In some cases, the contact may not be able to contact the inner surface of the flange and the partner of the single seat at the same time, and may come into contact with the flange surface and the R surface.

Disc wheel manufacturers produce roughly 20 to 50 types of wheels of various sizes, and the radial runout of almost all of them is measured. Therefore,
According to the conventional measuring method described above, there is a problem in that the contactor must be replaced every time the type of wheel is changed.

The present invention has been made in view of the above, and it is possible to eliminate the radial runout of the bead seat of almost all types of disc wheels, including errors caused by the axial runout of the wheel, without replacing the contactor. The aim is to provide a device that can perform measurements without any problems.

Means for Solving the Problems> The configuration of the present invention will be explained with reference to FIG. 1, which is an embodiment drawing thereof.

A guide portion 2a is formed integrally with the contactor 1a.

The contact 1a and the guide portion 2a are supported by an arm 4a which is rotatable around a fulcrum 3a, for example, and the contact 1a
a is movable in the vertical direction in the figure, that is, in the two directions of the rotation axis of the disc wheel W.

The amount of movement of the contactor 1a in the direction orthogonal to the rotation axis Z is detected by the displacement sensor 5a.

The guide portion 2a is pressed against the outer end surface Fo forming the flange F of the disc wheel W by the cylinder 6a, the compression coil spring 7a, etc. during measurement. This results in
The contact 1a always comes into contact with the bead seat B at a constant distance from the outer end surface Fo.

Effect〉 Outer end surface F of flange F of disc wheel W.

Since the radial runout of the bead seat B is detected at a certain distance from the flange outer end face Fo, the measured value is not affected by the axial runout of the disc wheel W.
Because the guide portion 2a is pressed against the
There is no need to change.

<Example> Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.

The disc wheel W is rotated about the rotation axis Z while being in contact with the upper surface of the wheel mounting plate 1).

A contact 1a rotatably supported on the tip of an arm 4a is brought into contact with one bead seat B. Arm 4a has
A guide portion 2a is formed at a position a predetermined distance from the contact 1a. The arm 4a is rotatable relative to the base 10a about the fulcrum 3a, and is connected to one end of the piston rod 9a of the cylinder 6a via a pivot shaft 8a. A compression coil spring 7a is interposed between the base 10a and the arm 4a, and the elastic force of the compression coil spring 7a biases the arm 4a counterclockwise about the fulcrum 3a. When the cylinder 6a is driven to displace the piston rod 9a rearward (to the right in the figure), the arm 4a is pulled rearward against the elastic force of the compression coil spring 7a, and at the same time rotates around the fulcrum 3a. It is configured to be rotated clockwise.

A displacement sensor 5a such as a differential transformer is disposed on the other end surface of the piston rod 9a.

The same configuration as above is also provided for the other bead seat, and the same members are given the same numbers and suffixes, and the explanation thereof will be omitted.

The outputs of the above displacement sensors 5a and 5b are transmitted through amplifiers 21a and 21, respectively, as shown in the measurement circuit diagram in FIG.
After being amplified by b, the arithmetic unit 22 averages the value, and the display 23 displays the resulting value.

Next, the operation of the embodiment of the present invention will be described. When not measuring, the cylinders 6a and 6b are driven to touch the contact 1a.

While pulling 1b backward, the fulcrums 3a and 3b
The respective arms 4a and 4b are rotated clockwise and counterclockwise about . In this state, set the disc wheel W on the wheel mounting plate 1),
Each chamber of the cylinders 6a and 6b is opened. As a result, due to the action of the compression coil springs 7a+7b, the arms 4a,
4b are respectively displaced forward and at the same time counterclockwise 1
Rotate clockwise. At this time, the forward displacement end is such that the contacts 1a and lb are at the bead seat B of the disc wheel W.
, B', and by the guide portions 'la, 2b coming into contact with the flange outer end surfaces Fo, Fo' of the disc wheel W, respectively. That is, in this state, the contact 1a and the guide portion 2a are held in the bead seat B by the compression coil springs 7a and 7b.

The contact 1b and the guide portion 2b are pressed against the flange outer end surface FO, and the bead seat B/and the flange outer end surface FO', respectively.

When the disc wheel W is rotated about the rotation axis Z in this state, the contacts 1a and 1b move to the bead seats B and B' while maintaining a predetermined constant distance from the flange outer end surfaces Fo and Fo', respectively. are displaced in response to the radial deflection of the radial direction, and the amounts thereof are detected by displacement sensors 5a and 5b, respectively. The outputs of the displacement sensors 5a and 5b are averaged in calculation 822 and displayed on the display 23. This display value can be used as a result of checking whether the disc wheel W has been photographed in the radial direction, and can be used to determine whether the product is good or bad.

In addition, in the above embodiment, both bead seats B.

Although an example has been shown in which the contacts 1a and 1b are respectively provided on B' and the detected outputs of their movement amounts are averaged and displayed, it is of course possible to measure the bead seat of only one of them independently.

Further, the guide portions 'la, 2b are brought into sliding contact with the flange outer end surfaces Fo, Fo' as described above, and the contactors 1a,
In addition to regulating the axial position of lbO, the guide portion 2a,
The rollers 2b may each be constituted by rotatable rollers, and may be brought into rolling contact with the outer end surfaces Fo and Fo' of the flanges.

Furthermore, the runout of the bead seat can be determined by the amount of movement of the contacts 1a and lb during one rotation of the disc wheel.
Since the absolute positions of the contacts 1a and lb are not important, the contacts 1a and lb do not necessarily have to be rotatable relative to the arms 4a and 4b to avoid wear, and therefore are fixed to the arms 4a and 4b. It may also be of a sliding contact type.

For the same reason, instead of the contacts 1a, lb and displacement sensors 5a, 5b, a non-contact displacement sensor 1' is integrally attached to the guide parts 2a, 2b, and the deflection is determined from the amount of fluctuation in the output. In this case, as shown in FIG. 3, the arm 4a'.

A fulcrum 3' and a compression coil spring 7' may be provided.

Effect> As explained above, according to the present invention, the contactor 1 is movable in the direction of the rotation axis Z of the disc wheel W, and
By integrally providing a guide portion 2 on this contactor 1 and pressing this guide portion 2 against the flange outer end surface FO of the disc wheel W, the measurement position of the radial runout of the bead seat B by the contactor 1 can be adjusted to the flange. Since it is configured so that it is always a constant distance from the outer end surface FO, it is possible to measure disc wheels with different R dimensions of the R surface connecting the bead seat and flange without changing the contactor as in the conventional method. Work efficiency improves.

In addition, the contact between the guide part and the outer end surface of the flange regulated the measurement position by the contactor, so
Compared to the case of pressing the contact against the inner end face of the flange and the bead seat at the same time as in No. 82, the guide surface is wider and the adhesion is excellent, and an improvement in measurement accuracy can be expected.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a measurement circuit diagram thereof, Fig. 3 is a block diagram of main parts of another embodiment of the present invention, and Fig. 4 explains a measurement method using a conventional device. It is a diagram. la, lb... Contacts 2a, 2b... Guide parts 3a, 3b... Fulcrums 4a, 4b... Arms 5a, 5b... Displacement sensors 6a, 6b... Cylinder? a, 7b...Compression coil springs 9a, 9b...Piston rod 1)...Wheel mounting plate W...Disc wheel B, B'...Bead seats FO, FO'...Flange outer end surface 2...Rotation axis

Claims (2)

[Claims] (1) A contact element is brought into contact with a bead seat of a disc wheel, and the deflection in the radial direction of the disc wheel can be measured from the amount of movement of the contact element when the disc wheel is rotated. In the apparatus, the contactor is movably supported in the direction of the rotational axis of the disc wheel, and a guide part is integrally formed on the contactor, and the guide part forms a flange of the disc wheel during measurement. 1. An apparatus for measuring radial runout of a vehicle disc wheel, characterized in that the measurement position on the bead seat is always at a constant distance from the outer end surface by pressing the outer end surface. (2) Two contacts each having the guide portion formed thereon are provided, each contacting the outer end surfaces of one and the other of the disc wheels and the bead seat, and the average value of the radial movement amount of each contact. A device for measuring radial runout of a disc wheel for a vehicle according to claim 1, characterized in that the device is equipped with means for calculating the runout of both bead seats of the disc wheel, and is configured to display the average value of the runout of both bead seats of the disc wheel. .