IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0732624
(2003-12-10)
|
우선권정보 |
DE-102 57 907(2002-12-11) |
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
Ostrolenk, Faber, Gerb &
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
7 |
초록
▼
In a method and apparatus for checking the uniformity of a pneumatic tire of a vehicle wheel, first and second unbalance measuring operations are performed to determine unbalance vectors of the vehicle wheel, which are ascertained at differing wheel speeds and/or with differing tire pressures and th
In a method and apparatus for checking the uniformity of a pneumatic tire of a vehicle wheel, first and second unbalance measuring operations are performed to determine unbalance vectors of the vehicle wheel, which are ascertained at differing wheel speeds and/or with differing tire pressures and the difference is formed between the unbalance vectors for evaluation of the uniformity of the tire.
대표청구항
▼
What is claimed is: 1. A method of checking the uniformity of a pneumatic tire of a vehicle wheel, comprising measuring an unbalance of the vehicle wheel in a first measuring operation; measuring an unbalance of the vehicle wheel in a second measuring operation after the first unbalance measuring o
What is claimed is: 1. A method of checking the uniformity of a pneumatic tire of a vehicle wheel, comprising measuring an unbalance of the vehicle wheel in a first measuring operation; measuring an unbalance of the vehicle wheel in a second measuring operation after the first unbalance measuring operation wherein at least one of wheel speed and internal tire pressure during the first measuring operation are different from at least one of wheel speed and internal tire pressure during the second measuring operation; ascertaining first and second unbalance vectors of the vehicle wheel with the tire, during the first and second measuring operations and determining a difference between the two unbalance vectors to evaluate the uniformity of the tire. 2. A method as set forth in claim 1 including the first measuring operation for measuring forces acting due to wheel unbalance with the tire being at a first internal pressure, ascertaining the unbalance from the measured forces, storing the ascertained unbalance in the form of a first unbalance vector, the second measuring operation for measuring forces acting due to wheel unbalance, with the tire being at a second internal pressure differing from the first internal pressure, ascertaining the unbalance from the freshly measured forces measured in the second measuring operation, storing the freshly ascertained unbalance in the form of a second unbalance vector, and forming a difference from the first and second unbalance vectors. 3. A method as set forth in claim 1 including the first measuring operation for measuring forces acting due to wheel unbalance at a first rotary speed, ascertaining the unbalance from the measured forces, storing the ascertained unbalance in the form of a first unbalance vector, the second measuring operation for measuring forces acting due to wheel unbalance at a second rotary speed differing from the first rotary speed, ascertaining the unbalance from the freshly measured forces measured in the second measuring operation, storing the freshly ascertained unbalance in the form of a second unbalance vector, and forming a difference from the first and second unbalance vectors. 4. A method as set forth in claim 1 wherein the measuring is implemented in the form of a dynamic unbalance measuring operation for ascertaining unbalance of the wheel with the tire thereon. 5. A method as set forth in claim 1 wherein the unbalance vectors are ascertained in the first and the second measuring operations, and the tire is inflated at a higher pressure than a nominal pressure in the first measuring operation and is inflated at the nominal pressure in the second measuring operation. 6. A method as set forth in claim 1 wherein the difference between the first and the second unbalance vectors is compared with a tolerance which is admissible in dependence on the wheel dimensions. 7. Apparatus for checking the uniformity of a pneumatic tire of a vehicle wheel, including a wheel balancing machine comprising a rotary drive for a wheel for receiving the tire to be checked, a drive control for the drive, and at least one measurement value pickup operable for measuring forces acting due to an unbalance of the wheel during the rotation thereof, and an evaluation arrangement comprising a first device for ascertaining first and second unbalance vectors from the measured forces in the first and the second measuring operations with a difference in at least one of the wheel speed and the tire inflation pressure in the first and the second measuring operations, and a second device for ascertaining the difference of the unbalance vectors to evaluate the uniformity of the tire. 8. Apparatus as set forth in claim 7, further including a device operable for controlling the wheel balancing machine to perform the first measuring operation at a first parameter in respect of at least one of the wheel speed and the tire pressure and to perform the second measuring operation at a second parameter in respect of at least one of the wheel speed and the tire pressure, wherein the parameters are different from each other. 9. Apparatus as set forth in claim 7, further including a gas supply operable for supplying gas under pressure for inflating the tire at a preselected value. 10. Apparatus as set forth in claim 7 wherein the rotary drive and the drive control are so adapted that the rotary speed of the wheel is variable. 11. Apparatus as set forth in claim 7 wherein the wheel balancing machine further includes a measurement value pickup means for measuring the angular position of the wheel and wherein the first means of the evaluation arrangement is adapted to ascertain unbalance vectors from the measured forces and the measured angular position. 12. Apparatus as set forth in claim 7 wherein the evaluation arrangement further includes a display. 13. Apparatus as set forth in claim 12 further comprising a digital computer system wherein the evaluation arrangement is a component part of the digital computer system. 14. A computer program for computer-aided execution of the method steps reading in first measurement values of forces acting due to unbalance of a vehicle wheel with a tire during rotation thereof on measurement value pickups of a wheel balancing machine, wherein the rotary speed of the wheel and the inflation pressure of the tire have first values, ascertaining the unbalance from the read-in measurement values, storing the ascertained unbalance in the form of a first unbalance vector, reading in second measurement values of forces acting due to unbalance of the vehicle wheel during rotation thereof on the measurement value pickups of the wheel balancing machine, wherein at least one of the rotary speed of the wheel and the inflation pressure of the tire have second values which are different from the first values, ascertaining the unbalance from the second measurement values which are freshly read in, storing the freshly ascertained unbalance in the form of a second unbalance vector, and forming a difference from the two unbalance vectors. 15. A computer program as set forth in claim 14 and further adapted to carry out the method step of outputting a control signal for setting a tire pressure at a compressed air supply means. 16. A computer program as set forth in claim 14 and further adapted to carry out the method step of outputting a control signal for setting a rotary speed at a rotary drive of the wheel balancing machine. 17. A computer program as set forth in claim 14 and further adapted to carry out the method steps of reading in first and second measurement values in respect of an angular position. 18. A computer program as set forth in claim 14 and further adapted to carry out the method step of outputting a signal for displaying the position of a tire defect with respect to the wheel. 19. A digital storage medium with electronically readable control signals co-operable with a digital computer system for execution of a computer program, the computer program executing steps comprising reading in first measurement values of forces acting due to unbalance of a vehicle wheel with a tire during rotation thereof on measurement value pickup of a wheel balancing machine wherein the rotary speed of the wheel and the inflation pressure of the tire have first values, ascertaining the unbalance from the read-in measurement values, storing the ascertained unbalance in the form of a first unbalance vector, reading in second measurement values of forces acting due to unbalance of the vehicle wheel during rotation thereof on the measurement value pickup of the wheel balancing machine, wherein the rotary speed of the wheel and the inflation pressure of the tire have second values which are different from the first values, ascertaining the unbalance from the second measurement values which are freshly read in, storing the freshly ascertained unbalance in the form of a second unbalance vector, and forming a difference from the two unbalance vectors.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.