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Precision Measurement Method of Circumferential Length and Uncertainty for Steel Ring in CVT-pushing Belt

Article of Honda R&D Technical Review Vol.21 No.2

Summary

The accuracy of the circumferential length of the metal rings used in CVT-pushing belts need to be controlled on the micrometer level to help ensure the durability of the belts. The principle used in measuring the circumferential length of the metal rings is the measurement of infinitesimal differences in length between a master ring for circumferential length and the ring being examined. A highly accurate measurement method and a method of evaluating the uncertainty of these measurements are therefore necessary for the master ring for circumferential length.
In the measurement method discussed in this paper, the master ring for circumferential length is positioned between two rollers, the length between the centers of the rollers and the radii of the sections of the rollers around which the ring winds are measured, and the circumferential length of the ring is quantified. A high level of accuracy has been realized in the two sets of measurements through the use of a high-accuracy three-dimensional coordinate measuring machine (CMM). In addition, the uncertainty of the measurements of the length between the centers of the rollers and the radii of the rollers is quantified using gauge block and gauge ring measurements.
Because gauge blocks and gauge rings are instruments of a standard length with a specified level of dimensional uncertainty, the measured results for the master rings for circumferential length based on this measurement method are traceable with a high degree of accuracy.

Reference

(1) ISO/TS 15530-3: 2004, Geometrical Product Specifications (GPS)-Coordinate measuring machines (CMM): Technique for determining the uncertainty of measurement- Part3: Use of calibrated work pieces or standards
(2) ISO 14253-1: 1998, Geometrical Product Specifications (GPS)-Inspection by measurement of workpieces and measuring equipment-Part 1: Decision rules for proving conformance or nonconformance with specifications
(3) Izuka, K.: Keisoku niokeru Futashikasa no Hyougen Guide, Nihonkikakukyoukai, p. 50 (1996) (in Japanese)
(4) BIPM, IEC, IFCC, ISO, IUPAC, IUPAC, OIML: Guide to the expression of uncertainty in measurement, ISO First edition (1993)

Author (organization or company)

Kenta UMETSU(Automobile R&D Center)、Hiroyoshi MIKOGAI(Automobile R&D Center)

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