JPH07174528A - Measurement method for cross sectional shape of tire - Google Patents
Measurement method for cross sectional shape of tireInfo
- Publication number
- JPH07174528A JPH07174528A JP5320516A JP32051693A JPH07174528A JP H07174528 A JPH07174528 A JP H07174528A JP 5320516 A JP5320516 A JP 5320516A JP 32051693 A JP32051693 A JP 32051693A JP H07174528 A JPH07174528 A JP H07174528A
- Authority
- JP
- Japan
- Prior art keywords
- tire
- sectional shape
- cross
- dimensional image
- image data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は静的状態のタイヤ断面形
状は勿論のこと、車両走行中のタイヤと同様の動的負荷
時におけるタイヤ断面形状を測定可能にしたタイヤ断面
形状測定方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire sectional shape measuring method capable of measuring not only a tire sectional shape in a static state but also a tire sectional shape under a dynamic load similar to that of a tire running a vehicle.
【０００２】[0002]
【従来の技術】タイヤ性能について信頼性の高いタイヤ
を開発するためには、車両が走行中のタイヤの断面形状
のリアルタイムの変形を知ることは非常に重要な要因と
なる。特に、車両がコーナリング中の動的負荷をかけて
いるときのタイヤ断面形状を知ることが出来れば、タイ
ヤの開発に極めて有効である。2. Description of the Related Art In order to develop a tire with high reliability in tire performance, it is very important to know the real-time deformation of the sectional shape of the tire while the vehicle is running. In particular, if it is possible to know the tire cross-sectional shape when the vehicle is subjected to a dynamic load during cornering, it is extremely effective for tire development.
【０００３】従来、タイヤの断面形状を測定する方法し
ては、例えば、タイヤの表面に石膏を固めて型取りする
方法、固定具に支持された複数の針でタイヤ表面までの
距離をそれぞれ求める針ゲージによる方法等がある。し
かし、これらの方法は、いずれもタイヤを静止した状態
で測定するものであり、タイヤに荷重が負荷されて回転
している動的負荷時におけるタイヤ断面形状の測定方法
は未だ提案されていない。Conventionally, as a method for measuring the cross-sectional shape of a tire, for example, a method in which plaster is fixed on the surface of the tire to mold it, and a distance to the tire surface is obtained by a plurality of needles supported by a fixture. There is a method using a needle gauge. However, all of these methods measure the tire in a stationary state, and a method for measuring the tire cross-sectional shape under a dynamic load in which the tire is loaded and rotating has not been proposed yet.
【０００４】[0004]
【発明が解決しようとする課題】本発明の目的は、静的
状態のタイヤ断面形状は勿論のこと、動的負荷時におけ
るタイヤ断面の形状を容易に測定することが出来るタイ
ヤ断面形状測定方法を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a tire cross-section shape measuring method capable of easily measuring not only the tire cross-section shape in a static state but also the tire cross-section shape under a dynamic load. To provide.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成する本発
明は、リムにセットしたタイヤの側面にレーザースリッ
ト光を該側面に沿って走査させ、その側面からの反射光
をカメラで読み取って前記側面の３次元画像データを取
得し、該３次元画像データをタイヤの回転中心より半径
方向に切断してタイヤ断面形状を求めることを特徴とす
る。According to the present invention for achieving the above object, the side surface of a tire set on a rim is scanned with laser slit light along the side surface, and the reflected light from the side surface is read by a camera. It is characterized in that three-dimensional image data of the side surface is acquired and the three-dimensional image data is cut in the radial direction from the center of rotation of the tire to obtain the tire cross-sectional shape.
【０００６】このようにタイヤの側面にレーザースリッ
ト光を投光して非接触でタイヤ側面の３次元画像データ
を得、それを基にタイヤ断面形状を求めるため、回転中
の動的負荷時におけるタイヤ断面形状を容易に測定する
ことが出来る。In this way, the laser slit light is projected onto the side surface of the tire to obtain three-dimensional image data of the side surface of the tire in a non-contact manner, and the tire cross-sectional shape is obtained based on the data, so that a dynamic load during rotation is obtained. The tire cross-sectional shape can be easily measured.
【０００７】[0007]
【実施例】図１は本発明のタイヤ断面形状の測定方法に
用いられる装置の一例を示し、１は昇降可能な回転ドラ
ムで、このドラム１は上昇して回転自在に支持されたリ
ム２に装着されたタイヤＴに当接し、該タイヤＴに負荷
及び回転を付与するようになっている。３はスリット光
を投光するレーザー光源で、レーザースリット光をタイ
ヤＴの側面に照射するようになっている。４はタイヤＴ
の測定面から反射するレーザースリット光をを３次元画
像データとして読み取るテレビカメラ、５はテレビカメ
ラ４が読み取った３次元画像データをコンピュータ処理
する画像処理部で、その３次元画像データからタイヤ断
面形状を演算するようになっている。６は演算されたタ
イヤ断面形状を表示する表示部、７は画像処理部５に演
算に必要な基礎データを入力するための入力部である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of an apparatus used in the method for measuring the tire cross-sectional shape of the present invention, in which 1 is a rotating drum which can be raised and lowered, and which is mounted on a rim 2 rotatably supported by the drum 1. It abuts against the mounted tire T to apply load and rotation to the tire T. Reference numeral 3 denotes a laser light source that projects slit light, and irradiates the side surface of the tire T with the laser slit light. 4 is tire T
A television camera 5 that reads the laser slit light reflected from the measurement surface of the 3D image data as 3D image data is an image processing unit that processes the 3D image data read by the TV camera 4, and the tire cross-sectional shape is calculated from the 3D image data. Is calculated. Reference numeral 6 is a display unit for displaying the calculated tire cross-sectional shape, and 7 is an input unit for inputting basic data necessary for the calculation to the image processing unit 5.
【０００８】図２にタイヤ断面形状測定部の原理を示
す。レーザー光源３は左右２個がそれぞれＸーＺ座標面
上の（ｘ0,ｚ0 ），（−ｘ0,ｚ0 ）に配置され、テレビ
カメラ４はＹ軸上に設置さている。この状態でレーザー
光源３は回転させそのレーザー光源３から投光したスリ
ット光を測定対象物Ｎ（タイヤＴ）の表面全面に走査
し、これを対面するテレビカメラ４で撮像する。画像処
理部５はテレビカメラ４から入力されたビデオ信号を、
イメージエンコーダでリアルタイムで処理し、受光した
反射光の中の最大輝度レベルから３次元画像を合成す
る。この時の最大輝度レベルは投光角度コード化画像θ
（ｘ，ｙ）で得られるので、これに基づいてｆ（ｘ，
ｙ）＝ｚ0 −（ｘ0 −ｘ）・tan θ（ｘ，ｙ）の演算式
で３次元画像を求めるようになっている。FIG. 2 shows the principle of the tire cross-section shape measuring section. The two laser light sources 3 on the left and right are arranged at (x 0, z 0 ) and (-x 0, z 0 ) on the XZ coordinate plane, and the television camera 4 is installed on the Y axis. In this state, the laser light source 3 is rotated, and the slit light projected from the laser light source 3 is scanned over the entire surface of the measurement object N (tire T), and this is imaged by the facing TV camera 4. The image processing unit 5 converts the video signal input from the TV camera 4 into
The image encoder processes in real time and synthesizes a three-dimensional image from the maximum brightness level in the received reflected light. The maximum brightness level at this time is the projection angle coded image θ
Since (x, y) is obtained, based on this, f (x,
y) = z 0 − (x 0 −x) · tan θ (x, y) is used to obtain a three-dimensional image.
【０００９】図３は、上記のようにして求められたタイ
ヤ側面の３次元画像を表示部５に表示した例を示す。こ
れはタイヤサイズ１９５／６０Ｒ１５のタイヤを１００
km/hの速度で回転させ、負荷を３００kgf 加えたタイヤ
を、視野サイズ：２５０mm×２３４mm、画素数：２５６
×２４０、画素サイズ：０．９７６mm/1画素のテレビカ
メラを使用し、計測距離６１５mm、計測時間約８秒で測
定したものである。FIG. 3 shows an example in which the three-dimensional image of the tire side surface obtained as described above is displayed on the display unit 5. This is 100 tires with tire size 195 / 60R15
A tire with a load of 300 kgf rotated at a speed of km / h, field of view size: 250 mm x 234 mm, number of pixels: 256
It was measured using a television camera of × 240, pixel size: 0.976 mm / 1 pixel, with a measurement distance of 615 mm and a measurement time of about 8 seconds.
【００１０】一方、タイヤＴの側面の３次元画像と共に
得られたリム２のフランジ２ａの曲率からタイヤＴの回
転中心を求め、これに基づいて上記の３次元画像をタイ
ヤＴの半径方向に切断してデータ変換を行えば、図４に
示すようなタイヤ断面の形状を得ることが出来る。タイ
ヤＴの回転中心は、演算によらずに予めその情報データ
を入力部７からインプットして用いるようにしてもよ
い。On the other hand, the center of rotation of the tire T is obtained from the curvature of the flange 2a of the rim 2 obtained together with the three-dimensional image of the side surface of the tire T, and based on this, the above-mentioned three-dimensional image is cut in the radial direction of the tire T. Then, by converting the data, the shape of the tire cross section as shown in FIG. 4 can be obtained. The rotation center of the tire T may be used by inputting its information data in advance from the input unit 7 without using the calculation.
【００１１】このように本発明のタイヤ断面形状測定方
法は、動的負荷時におけるタイヤ断面形状を容易に測定
することが出来る。また、タイヤ半径方向の切断位置を
順次かえることにより、タイヤＴの接地前の状態から接
地開始及び接地終了までの刻々と変化する断面形状を定
量的に測定することも可能である。As described above, the tire cross-section shape measuring method of the present invention can easily measure the tire cross-section shape under a dynamic load. Further, by sequentially changing the cutting position in the tire radial direction, it is possible to quantitatively measure the cross-sectional shape of the tire T, which changes every moment from the state before the ground contact to the start and the end of the ground contact.
【００１２】[0012]
【発明の効果】上述したように本発明のタイヤ断面形状
測定方法は、タイヤの側面にレーザースリット光をその
側面に沿って走査するように投光し、それをカメラで読
み取ってタイヤ側面の３次元画像データを取得し、それ
をタイヤの回転中心より半径方向に切断してタイヤ断面
形状を求めるようにしたため、回転走行中のタイヤを非
接触で測定可能にし、その動的負荷状態の断面形状を容
易に測定することが出来る。また、半径方向の切断位置
を順次かえることにより、タイヤの接地前から接地開
始、接地終了までの断面形状の刻々とした変化を定量的
に測定することも出来る。また、静的状態のタイヤ断面
形状も測定することが出来る。As described above, according to the tire cross-section shape measuring method of the present invention, the laser slit light is projected on the side surface of the tire so as to scan along the side surface, and the light is read by the camera to read the tire side surface. Since the three-dimensional image data was acquired and the tire cross section was obtained by cutting it in the radial direction from the center of rotation of the tire, it is possible to measure the tire running in rotation without contact, and the cross-sectional shape in the dynamic load state. Can be easily measured. Further, by sequentially changing the cutting positions in the radial direction, it is possible to quantitatively measure the momentary change in the cross-sectional shape from before the tire touches the ground to when the tire touches the ground. Also, the tire cross-sectional shape in a static state can be measured.
【図１】本発明のタイヤ断面形状測定方法に用いられる
装置の一例を示す説明図である。FIG. 1 is an explanatory view showing an example of an apparatus used in a tire cross-sectional shape measuring method of the present invention.
【図２】図１の測定部の原理を示す説明図である。FIG. 2 is an explanatory diagram showing the principle of the measuring unit in FIG.
【図３】本発明の方法により得られたタイヤ側面の３次
元画像を示す斜視図である。FIG. 3 is a perspective view showing a three-dimensional image of the side surface of the tire obtained by the method of the present invention.
【図４】本発明の方法により得られたタイヤの断面形状
を示す説明図である。FIG. 4 is an explanatory view showing a cross-sectional shape of a tire obtained by the method of the present invention.
１ 回転ドラム ２ リム ３ レーザー光源 ４ テレビカメラ ５ 画像処理部 ６ 表示部 ７ 入力部 Ｔ タイヤ 1 rotating drum 2 rim 3 laser light source 4 TV camera 5 image processing unit 6 display unit 7 input unit T tire
Claims (1)
ースリット光を該側面に沿って走査させ、その側面から
の反射光をカメラで読み取って前記側面の３次元画像デ
ータを取得し、該３次元画像データをタイヤの回転中心
より半径方向に切断してタイヤ断面形状を求めるタイヤ
断面形状測定方法。1. A side surface of a tire set on a rim is scanned with laser slit light along the side surface, and reflected light from the side surface is read by a camera to acquire three-dimensional image data of the side surface, and the three-dimensional image is obtained. A tire cross-section shape measuring method for obtaining a tire cross-section shape by cutting image data in the radial direction from the center of rotation of the tire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5320516A JPH07174528A (en) | 1993-12-20 | 1993-12-20 | Measurement method for cross sectional shape of tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5320516A JPH07174528A (en) | 1993-12-20 | 1993-12-20 | Measurement method for cross sectional shape of tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07174528A true JPH07174528A (en) | 1995-07-14 |
Family
ID=18122323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5320516A Pending JPH07174528A (en) | 1993-12-20 | 1993-12-20 | Measurement method for cross sectional shape of tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07174528A (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10115508A (en) * | 1996-10-14 | 1998-05-06 | Bridgestone Corp | Inspection apparatus for inspecting mark of tire |
| KR20040029856A (en) * | 2002-10-02 | 2004-04-08 | 금호타이어 주식회사 | Measurement apparatus of tire standing wave |
| JP2004226258A (en) * | 2003-01-23 | 2004-08-12 | Toyo Tire & Rubber Co Ltd | Tire testing apparatus |
| KR100453327B1 (en) * | 2001-12-19 | 2004-10-20 | 한국타이어 주식회사 | Apparatus for Measuring Clearances between Bead and Rim |
| JP2007292473A (en) * | 2006-04-21 | 2007-11-08 | Hitachi Plant Technologies Ltd | Railroad vehicle running wheel measuring instrument |
| JP2008221896A (en) * | 2007-03-08 | 2008-09-25 | Kobe Steel Ltd | Apparatus and method for detecting tire shape |
| JP2011027509A (en) * | 2009-07-23 | 2011-02-10 | Yokohama Rubber Co Ltd:The | System and method for analyzing tire |
| JP2011220964A (en) * | 2010-04-14 | 2011-11-04 | Bridgestone Corp | Tire side face failure detection method and device |
| CN102305599A (en) * | 2011-05-19 | 2012-01-04 | 广州华工百川科技股份有限公司 | Tire section structure surveying instrument and method |
| KR101319013B1 (en) * | 2011-12-20 | 2013-10-17 | 충북대학교 산학협력단 | Precise Diameter Measurement Device And Method using laser irradiation device |
| CN103376068A (en) * | 2012-04-27 | 2013-10-30 | 南京理工大学 | Laser three-dimensional shape testing device and method for acquiring object plane three-dimensional information thereof |
| CN110658004A (en) * | 2018-06-29 | 2020-01-07 | 卡尔蔡司光电科技有限责任公司 | Method for testing a tyre |
| DE102019121662A1 (en) * | 2019-08-12 | 2021-02-18 | Carl Zeiss Optotechnik GmbH | Procedure for testing a tire |
| CN113865504A (en) * | 2021-08-31 | 2021-12-31 | 建大橡胶（中国）有限公司 | Method for improving tire section scanning image precision |
-
1993
- 1993-12-20 JP JP5320516A patent/JPH07174528A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10115508A (en) * | 1996-10-14 | 1998-05-06 | Bridgestone Corp | Inspection apparatus for inspecting mark of tire |
| KR100453327B1 (en) * | 2001-12-19 | 2004-10-20 | 한국타이어 주식회사 | Apparatus for Measuring Clearances between Bead and Rim |
| KR20040029856A (en) * | 2002-10-02 | 2004-04-08 | 금호타이어 주식회사 | Measurement apparatus of tire standing wave |
| JP2004226258A (en) * | 2003-01-23 | 2004-08-12 | Toyo Tire & Rubber Co Ltd | Tire testing apparatus |
| JP2007292473A (en) * | 2006-04-21 | 2007-11-08 | Hitachi Plant Technologies Ltd | Railroad vehicle running wheel measuring instrument |
| JP2008221896A (en) * | 2007-03-08 | 2008-09-25 | Kobe Steel Ltd | Apparatus and method for detecting tire shape |
| US7724377B2 (en) * | 2007-03-08 | 2010-05-25 | Kobe Steel, Ltd. | Apparatus and method for detecting tire shape |
| JP2011027509A (en) * | 2009-07-23 | 2011-02-10 | Yokohama Rubber Co Ltd:The | System and method for analyzing tire |
| JP2011220964A (en) * | 2010-04-14 | 2011-11-04 | Bridgestone Corp | Tire side face failure detection method and device |
| CN102305599A (en) * | 2011-05-19 | 2012-01-04 | 广州华工百川科技股份有限公司 | Tire section structure surveying instrument and method |
| KR101319013B1 (en) * | 2011-12-20 | 2013-10-17 | 충북대학교 산학협력단 | Precise Diameter Measurement Device And Method using laser irradiation device |
| CN103376068A (en) * | 2012-04-27 | 2013-10-30 | 南京理工大学 | Laser three-dimensional shape testing device and method for acquiring object plane three-dimensional information thereof |
| CN103376068B (en) * | 2012-04-27 | 2016-01-20 | 南京理工大学 | The acquisition methods of laser three-D pattern proving installation and object plane three-dimensional information thereof |
| CN110658004A (en) * | 2018-06-29 | 2020-01-07 | 卡尔蔡司光电科技有限责任公司 | Method for testing a tyre |
| DE102019121662A1 (en) * | 2019-08-12 | 2021-02-18 | Carl Zeiss Optotechnik GmbH | Procedure for testing a tire |
| CN113865504A (en) * | 2021-08-31 | 2021-12-31 | 建大橡胶（中国）有限公司 | Method for improving tire section scanning image precision |
| CN113865504B (en) * | 2021-08-31 | 2024-03-26 | 建大橡胶（中国）有限公司 | Method for improving tire section scanning image precision |
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