Method and apparatus for determining geometrical data of a motor vehicle wheel mounted rotatably about an axis of rotation
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01C-001/00
G01B-011/26
출원번호
US-0660966
(2003-09-12)
우선권정보
EP-02020684(2002-09-13)
발명자
/ 주소
Braghiroli,Francesco
출원인 / 주소
Snap On Equipment SRL a Unico Socio
대리인 / 주소
Ostrolenk, Faber, Gerb &
인용정보
피인용 횟수 :
4인용 특허 :
6
초록▼
A method and an apparatus for determining geometrical data of a motor vehicle wheel 2 mounted rotatably about an axis of rotation 1, in which in at least two planes 19, 20 which are perpendicular to the axis of rotation 1, the distances of a plurality of measurement points on a respective periphery
A method and an apparatus for determining geometrical data of a motor vehicle wheel 2 mounted rotatably about an axis of rotation 1, in which in at least two planes 19, 20 which are perpendicular to the axis of rotation 1, the distances of a plurality of measurement points on a respective periphery of the corresponding part of the wheel (wheel rim 9) from a reference location 5 and the rotary angle positions of the respective measurement points are measured and the position of the motor vehicle wheel 2 with respect to the axis of rotation 1 is determined from the measurement values.
대표청구항▼
The invention claimed is: 1. A method of determining geometrical data of a motor vehicle wheel, the method comprising the steps of: mounting the wheel rotatably about an axis of rotation on a main shaft of a wheel balancing machine; scanning a plurality of measurement points on the rotating wheel i
The invention claimed is: 1. A method of determining geometrical data of a motor vehicle wheel, the method comprising the steps of: mounting the wheel rotatably about an axis of rotation on a main shaft of a wheel balancing machine; scanning a plurality of measurement points on the rotating wheel in contactless mode in at least two planes perpendicular to the axis of rotation and on a respective periphery of the corresponding part of the wheel; measuring spacings of said plurality of measurement points from a reference location and rotary angle positions of the respective measurement points; and determining the position of the motor vehicle wheel with respect to the axis of rotation from the measured values of said spacings and said rotary angle positions, the scanning being carried out by a scanning light beam that has an unchanging direction at least during a revolution of the wheel. 2. A method according to claim 1, wherein the at least one of the eccentricity and the angle of inclination of the geometrical axis of the wheel, with respect to the axis of rotation, is determined from the measurement values. 3. A method according to claim 1, wherein the measurement points are scanned on a surface of the part of the wheel, and the part is substantially parallel to the axis of the wheel or a surface of the part of the wheel, which is substantially inclined or perpendicular. 4. A method according to claim 1, wherein a lateral wobble (run out) and/or radial wobble (run out) on the wheel is or are ascertained from the measured values. 5. A method according to claim 1, wherein the measurement points are scanned on parts of the wheel of the inside of the wheel and/or the outside of the wheel and/or at the periphery of the wheel. 6. A method according to claim 1, wherein the position ascertained from the measured values, at least one of the eccentricity and inclination of the geometrical axis of the wheel with respect to the axis of rotation is used for correction of balancing parameters (balancing mass, angular position) which are ascertained in an unbalance measuring operation. 7. A method according to claim 4, wherein by ascertaining the run out data of the rim and the unbalance data of the vehicle wheel in a first positional relationship of the tire and the rim, and by matching the rim and the tire in a second positional relationship the effects of the run out of the rim and of the unbalance of the vehicle wheel will be minimized. 8. A method of determining geometrical data of a motor vehicle wheel mounted rotatably about an axis of rotation, according to claim 1, wherein the spacings of the measurement points on a pneumatic tire of the motor vehicle wheel and on one or more peripheral lines about the axis of rotation, relative to a reference location, are measured at different inflation pressures. 9. A method according to claim 8, further including ascertaining the run out data of the rim and the stiffness data of the tire in a first positional relationship of the tire and the rim, and matching the rim and the tire in a second positional relationship to minimize the effects of the run out of the rim and of the difference of stiffness around the circumference of the tire. 10. A method according to claim 9, wherein tire irregularities, tire stiffness values, in the peripheral direction of the pneumatic tire, are ascertained from the differences in the measured values of the spacings for the respective measurement points. 11. Apparatus for determining geometrical data of a motor vehicle wheel comprising a main shaft of a wheel balancing machine; clamping means to mount the wheel rotatably about an axis of rotation on the main shaft of the wheel balancing machine; a contactless scanning device which scans, with a scanning light beam, measurement points on at least two peripheries on parts of the wheel, the two peripheries being in planes perpendicular to the axis of rotation, wherein a direction of the scanning light beam remains unchanged at least during revolution of the wheel; a spacing measuring device connected to the scanning device which measures spacings of the measurement points scanned on the wheel from a reference location; a rotary angle sensor for determining the respective rotary angle positions of the scanned measurement points during rotation of the wheel about the axis of rotation; and an evaluation device to which the spacing measuring device and the rotary angle sensor are connected, wherein the evaluation device has a computer which determines the position of the motor vehicle wheel and the position of the geometrical axis of the wheel with respect to the axis of rotation from the spacings of the measurement points from the reference location and the respective rotary angle positions of the measurement points. 12. Apparatus according to claim 11, wherein the scanning device and the spacing measuring device form a movable spacing measuring unit. 13. Apparatus according to claim 12, wherein the spacing measuring unit is in the form of a triangulation measuring device. 14. Apparatus according to claim 11, wherein there are provided three spacing measuring units of which respective spacing measuring units are directed on to the inside of the wheel, the outside of the wheel and the peripheral surface of the wheel. 15. Apparatus according to claim 14, wherein the spacing measuring units directed on to the inside of the wheel and the outside of the wheel are mounted pivotably. 16. Apparatus according to claim 14, wherein the spacing measuring unit directed on to the peripheral surface of the wheel is mounted so as to be displaceable parallel to the axis of rotation. 17. Apparatus according to claim 11, wherein the rotary angle sensor is non-rotatably coupled to the motor vehicle wheel.
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이 특허에 인용된 특허 (6)
Bartko Robert J. ; Rosen Jack H., Intelligent sensor method and apparatus for an optical wheel alignment machine.
Downing Elizabeth A. (Sunnyvale CA) Rogers Steven W. (Conway AR) Titsworth Raymond (Conway AR) Christian Donald J. (Fremont CA) Baird Michael L. (Los Altos CA), Light scanning system for measurement of orientation and physical features of a workpiece.
Sotgiu, Paolo, Method of and apparatus for determining geometrical dimensions of a wheel rim, in particular when fitting and/or removing a motor vehicle tyre.
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