SAE J 866-2012 Friction Coefficient Identification and Environmental Marking System for Brake Linings《制动衬面的摩擦系数识别和环境标记系统》.pdf

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1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there

2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2012 SAE International All rights reserved. No part of this p

3、ublication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-497

4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visit http:/www.sae.org/technical/standards/J866_201207SURFACEVEHICLERECOMMENDEDPRACTICEJ866 JUL2012 Issued 1964-03 Revised 201

5、2-07Superseding J866 JAN2012 Friction Coefficient Identification and Environmental Marking System for Brake Linings RATIONALE This SAE Recommended Practice is being revised for conformity with existing state regulations. 1. SCOPE This SAE Recommended Practice is intended to provide a uniform means o

6、f identification which may be used to classify the friction coefficient of brake linings, based on data obtained from tests conducted in accordance with SAE J661 Brake Lining Quality Test Procedure and SAE J2975 Measurement of Copper and other elements in Brake Friction Materials. NOTE: It is emphas

7、ized that this document does not establish friction requirements for brake linings, nor does it designate significant characteristics of brake linings which must be considered in overall brake performance. Due to other factors that include brake system design and operating environment, the friction

8、codes obtained from this document cannot reliably be used to predict brake system performance. 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall ap

9、ply. 2.1.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.SAE J661 Brake Lining Quality Test Procedure SAE J2975 Measurement of Copper and Other Elements in Bra

10、ke Friction Materials SAE J866 Revised JUL2012 Page 2 of 4 3. CODING The required code will consist of two parts. The first part is the friction coefficient as determined from Table 1 when tested according to SAE J661. The second part is environmental markings of section 4. The environmental marking

11、s are to be the last characters in the edge code string with no additional alpha or numeric characters following. It is recommended that all markings be separated by a space, dash, dot or reasonable facsimile between characters for clarity. Example: FF B16 indicates a material with normal and hot fr

12、iction coefficient over 0.35 but not over 0.45 per SAE J661, meeting the limits for a “B” designation of Table 2 when measured per SAE J2975, and manufactured in 2016 A complete edge code including company ID, formulation, friction coefficient, (optional) batch code and environmental markings would

13、resemble the following example: SCB 115 FF 1660 B16 SCB: Company Assigned ID (Not less than two (2) characters) 115: Formulation Identification FF: Hot and cold friction coefficient (Required per SAE J661) 1660: Material produced on the 60thday of 2016. (The batch code is optional and up to the disc

14、retion of the manufacturer as long as it does not conflict with the environmental markings.) B16: Material meeting the limits for a “B” designation of Table 2 when measured per SAE J2975, and manufactured in 2016 (Required per SAE J866 and must be located at the end of the markings) The two letters

15、reflecting the friction coefficients are as follows: TABLE 1 - FRICTION COEFFICIENT CODING Code Letter Friction Coefficient C Not over 0.15 D Over 0.15 but not over 0.25 E Over 0.25 but not over 0.35 F Over 0.35 but not over 0.45 G Over 0.45 but not over 0.55 H Over 0.55 Z Unclassified 3.1 The first

16、 letter will represent normal friction coefficient and the second will represent hot friction coefficient. 3.2 Normal Friction Coefficient Normal friction coefficient is defined as the average of 4 points on the second fade curve, located at 93 C (200 F), 121 C (250 F), 149 C (300 F), and 204 C (400

17、 F). SAE J866 Revised JUL2012 Page 3 of 4 3.3 Hot Friction Coefficient Hot friction coefficient is defined as the average of 10 points located at 204 C (400 F) and 149 C (300 F) on the first recovery; 232 C (450 F), 280 C (500 F), 288 C (550 F), 316 C (600 F), and 343 C (650 F) on the second fade; a

18、nd 280 C (500 F), 204 C (400 F), and 149 C (300 F) on the second recovery. NOTE: If any temperature point or points required to calculate friction coefficients are not reached in the prescribed time limit, the coefficient of friction value at 10 min shall be used to give the full number of points re

19、quired. 3.4 Example A lining having a normal friction coefficient of 0.29 and a hot friction coefficient of 0.40 would be coded “EF”. 3.5 Location of Code The appropriate code designation will be marked on an external noncontacting surface in letters not less than 2.8 mm in height where a brake lini

20、ng is 3.2 mm or greater in thickness, or no more than 0.4 mm less than the thickness where the brake lining thickness is less than 3.2 mm. 4. ENVIRONMENTAL MARKINGS The environmental markings will be used by manufacturers to designate content of various regulated materials and their concentrations.

21、Marking requirements and locations of Section 3 shall apply. 4.1 Marking Contents The markings will consist of a mark or marks denoting material concentration followed by the two digit year of manufacture. 4.2 Marking Criteria 4.2.1 ”A” Designated Material An “A+Year” designated material is a materi

22、al which contains concentrations below the requirements for heavy metals and asbestiform fibers listed below when tested according to SAE J2975. See Table 2. 4.2.2 “B” Designated Material A “B+Year” designated material is a material, which meets “A” requirements above and has concentrations in the r

23、ange of greater than 0.5% to a maximum of 5% copper content by weight when measured according to SAE J2975. See Table 2. SAE J866 Revised JUL2012 Page 4 of 4 4.2.3 “N” Designated Material A “N+Year” designated material is a material, which meets “A” requirements above and also contains 0.5% or lower

24、 copper content by weight when measured according to SAE J2975. See Table 2. TABLE 2 - PERCENT BY WEIGHT LIMITS PER MATERIAL DESIGNATION Chemical element “A” material “B” material “N” materialCadmium and its compounds 0.01 0.01 0.01 Chromium (VI)-salts 0.1 0.1 0.1 Lead and its compounds 0.1 0.1 0.1

25、Mercury and its compounds 0.1 0.1 0.1 Asbestiform fibers 0.1 0.1 0.1 Copper and its compounds n.a. 0.5 to 5.0 0.5 Examples: “A15” material manufactured in 2015 and meets the “A” material designation “B16” material manufactured in 2016 and meets the “B” material designation “N17” material manufacture

26、d in 2017 and meets the “N” material designation 5. NOTES 5.1 Marginal Indicia A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. PREPARED BY THE SAE BRAKE LININGS STANDARDS COMMITTEE