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Improvements in tire uniformity testing

A technology of tires and carriages, which is applied in the direction of automobile tire testing, vehicle testing, machine/structural component testing, etc. It can solve problems such as customer dissatisfaction, unfavorable tire measurement, and low tire revenue, so as to improve repeatability. Effect

Inactive Publication Date: 2005-07-27
MICRO POISE MEASUREMENT SYST
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

That is, the quality of the inspection machines is as high as in previous years (and even improved somewhat), but their repeated measurements along with the inspection tires show that the inspection machines are not up to standard
[0006] Moreover, the measurement of these unfavorable tires presents a problem for tire manufacturers
Manufacturers of tires cannot reliably grade tires into the correct categories if there is a large uncertainty in the measurement of their characteristics (at least when measured within a commercially practicable time) and may result in customer dissatisfaction Or unnecessary loss of revenue due to underrating tires

Method used

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Embodiment Construction

[0013] One reason for the decrease in the mechanical repeatability of the uniformity test is that when the tire is under load, when the tire rotation direction is reversed, the tire "adjusts" during the reversal process, and this "adjustment" will affect what is done in the second rotation direction Measurement, especially the measurement of radial force variables. It is believed that this effect can be predicted based on the angular position at which the tire reverses, from an increase in the radial force variable to a decrease in the radial force variable through almost no change. Since the radial forces in the two rotation directions show a high degree of similarity, the reversal can be controlled based on the measurement made in the first direction, so that a small radial force change is produced in the second direction. This enables the inspection machine to provide a true measurement of the radial force in the second direction on the basis of good repeatability.

[0014] Acc...

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Abstract

A method and apparatus for testing tires. In step (110), the radial force variation is measured in the current direction of rotation. The first harmonic of this force variation is calculated in step (120) and a tire position corresponding to either zero crossing of the first harmonic is determined in step (130). In step (140), the tire position is monitored until a zero crossing is reached. The rotation direction is reversed at the appropriate location in step (150) and the test is continued.

Description

Technical field [0001] The present invention relates to the field of tire uniformity inspection machinery, and more specifically to a technology for improving the repeatability of uniformity inspection machinery. Background technique [0002] An integral part of tire manufacturing is to check the uniformity of the tire. After the tires are made, they are sent to the inspection machine along the prescribed route. An example of a tire uniformity inspection machine is described in US Patent No. 6,016,695 entitled "Tire Uniformity Inspection System". This patent is hereby incorporated by reference. A typical uniformity inspection machine automatically transfers the tire to the inspection machine, clamps it between the two rims, inflates it, presses against a drum to simulate the weight of the car to load it, and continues the inspection steps. The tires are then marked and sorted and sent to one of several output conveyor belts. In U.S. Patent No. 5,979,231 entitled "Load Wheel Assem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M1/22G01M17/02
CPCG01M17/022G01M17/02
Inventor 詹姆斯·毕比巴里·卡戈乌德理查德·马图萨尼
Owner MICRO POISE MEASUREMENT SYST
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