ISO 18164 PDF

After the publication of this standard IS : shall be withdrawn. Certain conventions are, however, not identical to those used in Indian Standards. Jhe number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. The relationship between values obtained and the fuel economy of the vehicle is undetermined, and such values are not intended to be used to indicate levels of performance or quality.

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After the publication of this standard IS : shall be withdrawn. Certain conventions are, however, not identical to those used in Indian Standards.

Jhe number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. The relationship between values obtained and the fuel economy of the vehicle is undetermined, and such values are not intended to be used to indicate levels of performance or quality. This International Standard applies to ail passenger car, truck, bus and motorcycle tyres. Measurement of tyres using this method enables comparisons to be made between the rolling resistance of new tyres when they are free-rolling straight ahead, in a position perpendicular to the drum outer surface, and in steady-state conditions.

In measuring tyre rolling resistance, it is necessary to measure small forces in the presence of much larger forces, it is, therefore, essential that equipment and instrumentation of appropriate accuracy be used. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document including any amendments applies. ISO , Definition of some terms used in the tyre industry — Part 1: Pneumatic tyres 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO and the following apply.

This is equivalent to a drag force in newtons N. The choice of an individual method is left to the tester. The measured parameters are given below. This measured value also includes the bearing losses of the tyre spindle and the aerodynamic losses of the tyre and the wheel. It should be noted that the results are different for different diameters; see 9. NOTE Historically, the measurement of the fore and aft longitudinal force on a flat surface machine has been shown to be quite difficult since this force is very small relative to other forces being measured- If a flat surface machine is used, care should be taken to correlate the data with the reference drum diameter in order to assure accurate results, 5.

For the textured drum surface, see B. The specific and respective values are shown in Annex C. Such a break-in shall be carried out on a test drum of at least 1 ,5 m diameter 1 ,7 m for truck and bus tyres for a period of at least 1 h, at a minimum speed as given in 6. Recommendations for warm-up periods are given in Annex B.

NOTE The measured value includes the bearing and aerodynamic losses of the wheel, the tyre and the drum, losses that are also to be considered. NOTE The measured value includes the drum losses to be considered. NOTE When the machine reading method is used to determine parasitic losses for the torque or power, the resulting rolling resistance includes aerodynamic losses of the tyre and wheel as well as the tyre-spindle friction. NOTE Annex A gives guidelines and practical examples to measure the moments of inertia for the deceleration method.

Key 1 tyre 2 torsion pendulum e angle of oscillation, in radians K spring constant Figure A. Depending upon the circumstances of particular tyre applications, it can be useful to determine the effect of these tyre-related parameters for the individual tyre to be tested.

If such information is desired, the options indicated in B. Unless otherwise noted, all aspects of the standard test conditions apply. A warm-up period of at least 30 min for the first speed and at least 20 min for each successive speed is required. A warm-up period of at least 90 min for capped pressure conditions and at least 30 min for regulated pressure conditions is required. For most tyres, the sequence shown accomplishes this objective. A warm-up period of at least 90 min for the first data point and at least 30 min for each successive data point is required.

A warm-up period of at least 30 min at the test speed is required. Table B. These tolerances are not meant to represent a complete set of engineering specifications for test equipment; instead, they should serve as guidelines for achieving reliable test results. C-2 Test rims C. If this is not available, then the next wider rim may be chosen. It should be noted that a change in rim width will result in different test results.

If spindle force is recorded for forward and reverse directions at each test condition , compensation is achieved by subtracting the "reverse" value from the "forward" value and dividing the result by two. If dynamic machine calibration is intended, the compensation terms may be easily incorporated in the data reduction. NOTE In cases where a textured drum surface is used instead of a smooth steel surface, this fact shall be noted in the test report.

The surface texture shall then be urn deep 80 grit. Copyright BIS has the copyright of all its publications. No part of the these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations.

Review of Indian Standards Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodically; a standard alongwith amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. This Indian Standard has been developed from Doc No. Scheme Vlf M, V.

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