JPH0587516A - Method for measuring surface roughness of rim for fitting tire - Google Patents

Abstract

PURPOSE:To enable a surface roughness of a rim base part to be measured without cutting the rim and then obtain a method for measuring the surface roughness of the rim for fitting tire for achieving reutilization of the rim after measurement. CONSTITUTION:A rod 7 where a probe 6 is provided at a tip is mounted to a drive unit 5 as a pick-up 8 and a surface-roughness meter 1 which enables a direction for mounting the rod 7 to be switched to at least two different directions for a drive direction of the drive unit 5 is used. The surface-roughness meter 1 is retained at a rim 9 to be measured without any contact and then a surface roughness of the rim 9 is measured by switching at least the rod to a mounting direction for reciprocating drive in axial direction of the rim 9 by allowing the tip probe 6 to contact a surface of the rim 9 and a mounting direction for reciprocating drive in peripheral direction of the rim 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the surface roughness of a tire mounting rim, and more particularly to a surface of a tire mounting rim capable of measuring the surface roughness of the rim without cutting the rim. The present invention relates to a roughness measuring method.

[0002]

2. Description of the Related Art A method of mounting a tire on a rim is to drop the bead portion of the tire inside the rim base portion, then slide the bead portion onto the upper surface of the rim base portion while applying internal pressure to the rim flange. It is carried out so that the contact pressure is applied. Therefore, if the friction coefficient between the beat portion and the rim base portion of the tire is non-uniform in the circumferential direction and the axial direction, even if a predetermined amount of air is injected into the tire, the tire does not completely fit into the rim, A part of the bead part is fitted halfway. If the tires are not evenly fitted to the rim in this manner, the vehicle loses balance and becomes unstable when traveling at high speed.

Therefore, in a rim, measuring the surface roughness of its rim base surface is an important task to pre-check whether the tire is within the criteria required to fit the rim perfectly. Is. Conventionally, in the measurement of the surface roughness of the rim base portion of such a rim, it is difficult to measure the surface roughness of the rim base portion as it is because of the complicated shape of the rim base portion. I was disconnected.

[0004]

However, if the rim is cut in this way, there is a problem that the rim cannot be reused as a product and is wasted. Further, there is a problem that it is not possible to actually check the fitting property with the tire by mounting the tire on the measured rim.

An object of the present invention is to provide a method for measuring the surface roughness of a tire mounting rim which enables the roughness of the surface of a rim base portion to be measured without cutting the rim and enables reuse of the rim after the measurement. To do.

[0006]

In order to achieve the above object, the present invention attaches a rod having a stylus at its tip to a drive unit as a pickup, and attaches the rod with respect to the drive direction of the drive unit. A surface roughness meter that can be switched in at least two different directions is used, and the surface roughness meter is held in a non-contact state with a rim to be measured, and at least the rod is attached to a stylus at its tip. The gist of the invention is to measure the surface roughness of the rim by switching between a mounting direction in which the rim is brought into contact with the surface of the rim and reciprocally driven in the axial direction of the rim and a mounting direction in which the rim is reciprocally driven in the circumferential direction. Is.

[0007]

The surface roughness meter in which the pickup rod can be switched in at least two directions is held in a non-contact state with the rim to be measured, and the rod is reciprocally moved in the axial direction of the rim. In addition, since it is possible to reciprocate in the circumferential direction of the rim, it is possible to directly measure the circumferential and axial surface roughness of the rim base portion without cutting the rim.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an explanatory view showing an outline of an apparatus configuration for carrying out a method for measuring a surface roughness of a tire mounting rim according to the present invention, 1 is a surface roughness meter used in this measuring method, and 9 is a measured object. It is a rim for. The rim 9 is supported by the mounting shaft 11.

As shown in FIG. 2, the surface roughness meter 1 includes a long rod 7 having a stylus 6 at the tip as a pickup 8.
And the rod 7 is attached to the drive unit 5. The mounting direction of the rod 7 with respect to the drive unit 5 can be changed in at least two ways with respect to the axial direction D of the drive unit 5. In this embodiment, the rod 7 is orthogonal to the longitudinal direction A and the longitudinal direction. It can be switched to direction B. That is, the rod 7 attached in the A direction can reciprocate in the arrow a direction, and
The rod 7 attached in the direction is capable of reciprocating in the direction of arrow b.

In the surface roughness tester 1 having the above-described structure, as shown in FIG. 1, the drive unit 5 of the main body is connected to the rim 9 via the support arm 4 on the vertically movable jig 3 standing on the fixed stand 2.
It is supported to be in a non-contact state. Further, at the time of this support, the stylus 6 at the tip of the rod 7 is brought into contact with the rim base portion 10 of the rim 9. The surface roughness of the rim is measured as shown in FIGS. 3 and 4 under the above-described settings of the surface roughness meter and the apparatus.

The roughness of the circumferential surface of the rim is measured as shown in FIG. First, the rod 7 is attached to the drive unit 5 in the mounting direction of A of FIG. Subsequently, the stylus 6 at the tip of the rod 7 is brought into contact with the surface of the rim base portion 10 of the rim 9. In this state, the axial direction (longitudinal direction) of the rod 7 and the circumferential direction of the rim 9 are parallel to each other.

Next, when the drive unit 5 is driven, the rod 7 reciprocates in the direction of arrow a, and accordingly, the stylus 6 at the tip of the rod 7 slides on the rim base portion 10 in the circumferential direction, The unevenness on the surface of the rim base portion 10 is measured.
The roughness of the axial surface of the rim is measured as shown in FIG. That is, the rod 7 is attached to the drive unit 5 in the attachment direction of B in FIG. When the measurement is performed subsequent to the circumferential surface roughness measurement of the rim, the rod 7 is switched from the A direction to the B direction in FIG. Then, the stylus 6 at the tip of the rod 7 is brought into contact with the rim base portion 10 so that the axial direction of the rod 7 and the circumferential direction of the rim 9 are parallel to each other.

Next, when the drive unit 5 is driven, the rod 7 reciprocates in the direction of the arrow b, so that the stylus 6 at the tip is moved.
Slides on the rim base portion 10 in parallel along the axial direction of the rim 9, and the unevenness of the surface of the rim base portion 10 is measured.

[0014]

According to the present invention, the surface roughness of the rim is measured by the method as described above, so that the surface roughness of the rim base portion of the rim can be measured without cutting the rim. Therefore, the rim can be reused, and the tire can be actually assembled to study the relationship between the surface roughness of the rim and the fitability of the tire.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an outline of an apparatus configuration when a method for measuring a surface roughness of a rim according to the present invention is carried out.

FIG. 2 is a plan view of a surface roughness meter used in the present invention.

FIG. 3 is an explanatory diagram for measuring the circumferential surface roughness of the rim in FIG. 1.

FIG. 4 is an explanatory diagram for measuring the surface roughness in the axial direction of the rim in FIG.

[Explanation of symbols]

 1 Surface roughness meter 5 Drive unit 6 Stylus 7 Rod 8 Pickup 9 Rim

Claims (1)

[Claims] 1. A surface roughness in which a rod having a stylus at its tip is attached to a drive unit as a pickup, and the attachment direction of the rod can be switched to at least two different directions with respect to the drive direction of the drive unit. The surface roughness of the surface of the rim to be measured is held in a non-contact state with the rim to be measured, and at least the rod is brought into contact with the surface of the rim with a stylus at the tip of the rod in the axial direction of the rim. A method for measuring the surface roughness of a tire mounting rim, wherein the surface roughness of the rim is measured by switching between the mounting direction in which the rim is reciprocally driven and the mounting direction in which the rim is reciprocally driven.