JPH0655916A - Tire lifting quantity measuring device - Google Patents

Abstract

PURPOSE:To measure a tire lifting quantity accurately by a two-dimensional image. CONSTITUTION:In a device to measure a lifting quantity of a tread part 3 in a tire 1 rotating at high speed while contacting with a substitutional road surface 2, a scale 4 is provided to identify a width directional standard of the tread part 3, and freely movable cameras 8 are provided to photograph the tire inclusive of the scale 4 while opposing respectively to the tread center and both tread shoulders, and a switch means 9 is provided to switch a system to treat immediately photographic data of the cameras 8 by means of a computer 10 and a system to carry out regenerative treatment through a regenerator 12 to/from each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device for measuring a lifting amount of a tire.

[0002]

2. Description of the Related Art As one of tire shape measuring techniques,
There is a lifting amount measuring technique for measuring a state in which a tread portion of a tire that rotates at a high speed while contacting a substitute road surface is raised in a radial direction due to a centrifugal force. In the conventional measuring apparatus, the center of the tread portion is photographed by a camera, and the steps of developing a film, enlarging a photograph by a projector, tracing, measuring a lift amount, calculating a tread radius and the like are performed.

[0003]

According to the prior art, since the lifting amount is displayed in one dimension and the projection is center projection with the tread portion as the center, accurate shooting of both shoulder portions is difficult. Therefore, it is difficult to uniformly measure the lifting amount of the entire tread portion.

Further, the number of days required for processing (analysis) after filming with a camera, that is, from film development to tread radius calculation, is 4 to 5 days, which makes it difficult to obtain a quick measurement result. there were. Therefore, according to the present invention, the photographing by the photographing device is performed separately for the center of the tread portion and both shoulder portions, thereby improving the photographing accuracy, and thus the measurement accuracy, and performing the automatic processing of the lifting amount measurement. It is intended to improve the efficiency with, and to enable the reproduction process and display the lifting amount in two dimensions.

[0005]

The present invention is an apparatus for measuring the lifting amount of a tread portion 3 in a tire 1 that rotates at a high speed by contacting a substitute road surface 2 and has the following objects. Are taking technical measures. That is, the present invention includes a scale 4 for determining the widthwise reference of the tread portion 3, and a movable camera 8 for capturing images including the scale 4 relative to each of the tread center and tread shoulders. It is characterized in that it is provided with a switch means 9 for switching to a system in which the image data taken by the image capturing device 8 is immediately processed by the computer 10 and a system in which it is reproduced and processed through the reproducing device 12.

[0006]

According to the present invention, the tread portion 3 of the tire 1 that is rotating at high speed in contact with the substitute road surface 2 is
Camera 8 moving with scale 4 for both shoulders
When the image data is captured by, and is processed in real time, the captured data is processed by switching the switch means 9 to the series of strobovision 7 and computer 10.

On the other hand, when performing reproduction processing, switch means
9 is switched to the sequence of the reproducing device 12 and processed by the computer 10.

[0008]

EXAMPLES Examples of the present invention will be described below with reference to the drawings. A tire 1 as an object to be measured is rotated at a high speed by grounding a tread portion 3 on a substitute road surface 2 shown by a drum, and a centrifugal force is applied. Therefore, a so-called lifting phenomenon occurs in which the tread portion 3 rises in the radial direction.

In taking a picture, a scale 4 for judging the widthwise reference of the tread portion 3 is provided, and the taken part can be projected on a strobe vision 7 through a strobe 5 and a widening device 6. Camera 8 that can move in the left and right directions corresponding to the center of the tread section 3 and both shoulders
, A CCD camera, for example, is connected to the strobovision 7 via the switch means 9 so that the photographing data can be immediately projected to the strobovision 7, and the strobovision 7 can be connected to the computer 10 to analyze the lifting amount. The result can be displayed two-dimensionally by the printer 11.

On the other hand, the switching means 9 is a processing system immediately via the strobovision 7 and a system capable of displaying the stored data two-dimensionally by the computer 10 and the video printer 13 via the reproducing device (video) 12. It can be switched. That is, the image of scale 4 as shown in FIG.
Image of tread center 3A with Fig. 4A and Fig. 2 (B)
The images of 3B and 3C lifting amount of both shoulders of the tread shown in (C) are displayed two-dimensionally, and compared with the one-dimensional display of the image 103A of the entire tread shown in FIG. 2D as in the conventional example. Improvement in accuracy can be expected.

Next, Table 1 and FIG. 3 show the measurement results for a tire of 225 / 55R16 93V, an air pressure of 2.0 kg / cm ² load of 10 kg, and a measuring rim 8-JX16.

[0012]

[Table 1]

In Table 1, the foot width is the length (mm) from the tread center to both shoulders, TJ is the tread joint, and RT is the tread radius. Also, Center
The (center) is the center of the tread, M: shld is the outer shoulder, and U: shld is the inner shoulder.

[0014]

The present invention is as described above, and automatic processing of lifting measurement can be performed in a few hours.
Playback processing is possible. Also, since the tread center and both shoulders are photographed, lens distortion can be removed to improve accuracy, and lifting development can be visually represented by a two-dimensional image.

[Brief description of drawings]

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

2A and 2B show images of a lifting phenomenon of the present invention and a conventional example, where FIG. 2A is a two-dimensional image of the present invention in a tread center, and FIGS. 2B and 2C are two-dimensional images of both shoulders.
(D) shows a conventional one-dimensional image.

FIG. 3 is a graph showing a relationship between a lifting amount and a traveling speed.

[Explanation of symbols]

 1 tire 2 substitute road surface 3 tread portion 7 strobovision 8 photographing device 9 switch means 10 computer 11 playback device (video) 12 printer 13 video printer

Claims (1)

[Claims] 1. A device for measuring a lifting amount of a tread portion (3) of a tire (1) which rotates at a high speed by contacting a substitute road surface (2), wherein a reference in a width direction of the tread portion (3) is used. Scale to judge
(4), and a movable imager (8) for taking images including the scale (4) relative to each of the tread center and both tread shoulders, and image data obtained by the imager (8) A tire lifting amount measuring device comprising: a system for immediate processing at (10) and a switch means (9) for switching to a system for recycling through a recycling device (12).