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US4404849A
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Method and system for correcting errors of measurement in tire uniformity inspecting machines
Assignee: Kobe Steel Ltd
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Filing: 1982-02-23
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Granted: 1983-09-20
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Expires: 2002-02-23
Abstract
Abstract A method for correcting errors of measurement due to variations in tire pressure in a tire uniformity inspecting operation, wherein a tire is inflated and rotated between a pair of rims and a load wheel is pressed against the tire and a radial force variation of said tire is measured, including: detecting a deviation of actual air pressure of the tire from a predetermined measuring pressure level to determine a correction coefficient; calculating a value of tire uniformity from the measured value of radial force variation according to the predetermined measuring pressure level; multiplying the calculated value of uniformity by the correction coefficient to compensate for any erroneous component due to a variation in the tire pressure.
Inventors
- 👤 Atsuaki Iwama
- 👤 Yoshimata Maikuma
- 👤 Masayoshi Okamoto
- 👤 Toshikazu Tanaka
- 👤 Yuji Oikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:52
CPC Classifications
G; G01; G01M; G01M17/00; G01M17/007; G01M17/02; G01M17/022
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
126 words
A method for correcting errors of measurement due to variations in tire pressure in a tire uniformity inspecting operation, wherein a tire is inflated and rotated between a pair of rims, a load wheel is pressed against the tire, and a radial force variation of the tire is measured, said method comprising: detecting a deviation of actual air pressure of said tire from a predetermined measuring pressure level to determine a correction coefficient; calculating a value of tire uniformity from the actually measured value of radial force variation of said tire according to the predetermined measuring pressure level; and multiplying the calculated value of uniformity of said tire by said correction coefficient to compensate for any erroneous component due to a variation in the tire pressure.
Claim 2
Independent Claim
126 words
A method for correcting errors of measurement due to variations in tire pressure in a tire uniformity inspecting operation, wherein a tire is inflated and rotated between a pair of rims, a load wheel is pressed against the tire, and a radial force variation of the tire is measured, said method comprising: detecting a deviation of actual air pressure of said tire from a predetermined measuring pressure level to determine a correction coefficient; calculating a value of tire uniformity from the actually measured value of radial force variation of said tire according to the predetermined measuring pressure level; and multiplying the calculated value of uniformity of said tire by said correction coefficient to compensate for any erroneous component due to a variation in the tire pressure.
Claim 3
Dependent Claim
49 words
A method as set forth in claim 1, wherein said correction coefficient is expressed by ##EQU5## wherein K is a constant predetermined based on the influence of air pressure on the value of radial force variation and ΔP is a detected pressure deviation from said preset measuring pressure level.
Claim 4
Independent Claim
134 words
A system for correcting errors of measurement due to variations in tire pressure in a tire uniformity inspecting operation, wherein a tire is inflated and rotated between a pair of rims, a load wheel is pressed against the rotating tire, and a measuring device provided to measure a radial force variation of said tire, said system comprising: an arithmetic unit for calculating a deviation of actual air pressure of said tire from a predetermined measuring pressure level to determined a correction coefficient; a uniformity calculator for calculating a value of tire uniformity from the actually measured radial force variation according to said predetermined measuring pressure level; and a multiplier for multiplying the calculated value of uniformity by said correction coefficient to compensate for any erroneous component due to a variation in the tire pressure.
Claim 5
Independent Claim
134 words
A system for correcting errors of measurement due to variations in tire pressure in a tire uniformity inspecting operation, wherein a tire is inflated and rotated between a pair of rims, a load wheel is pressed against the rotating tire, and a measuring device provided to measure a radial force variation of said tire, said system comprising: an arithmetic unit for calculating a deviation of actual air pressure of said tire from a predetermined measuring pressure level to determined a correction coefficient; a uniformity calculator for calculating a value of tire uniformity from the actually measured radial force variation according to said predetermined measuring pressure level; and a multiplier for multiplying the calculated value of uniformity by said correction coefficient to compensate for any erroneous component due to a variation in the tire pressure.
Claim 6
Dependent Claim
53 words
A system as set forth as in claim 3, wherein said correction coefficient is expressed by ##EQU6## where K is a constant predetermined based on the influence of air pressure on the value of radial force variation of said tire and ΔP is a calculated pressure deviation from said predetermined measuring pressure level.
References Cited (Backward Citations)
US4223386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |