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 theref
2、rom, 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 pub
3、lication 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: +1 724-776-4970
4、(outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J1953_201206SURFACEVEHICLERECOMMENDEDPRACTICEJ1953 JUN2012 Issued 1993-10Revised 201
5、2-06Superseding J1953 SEP2001 Brake-Stroke Indicator Design Guideline for Cam or Disc Air-Brake Actuators RATIONALEThis standard is being revised as part of the 5 year review process. Most of the revisions are updates to format and wording only. The tolerance for the placement of the stroke indicato
6、r band was changed to + 0.0 -3.8 mm (+0 -.15 in) tolerance instead of +0.0 to 3.8 mm (+0 to .15 in). The minus tolerance means the indicator will begin to show from readjust stroke (max.) to 3.8 mm (.15 in) before the readjust stroke is reached. The old tolerance would allow the indicator to begin s
7、howing at readjust stroke or up to 3.8 mm (.15 in) after readjust stroke has been reached. The minus tolerance does not reduce the effectiveness of the indicator, but the old plus tolerance may allow for reduced brake effectiveness beyond the stated readjust point.1. SCOPE This SAE Recommended Pract
8、ice shall cover mechanical- readjust stroke indicators for actuators with visible exposed pushrods and electrical-readjust stroke indicators for all air-brake actuators.This device shall indicate the foundation brake(s) may require adjustment or service when inspected per vehicle manufacturers proce
9、dures. A measurement shall be made to determine actual stroke measurement for any system not factory calibrated.Stroke indication accuracy of an air-brake actuator can be assured only when all of its components are supplied by the original brake actuator manufacturer. 1.1 Purpose This document estab
10、lishes design guidelines for air-brake actuator stroke indicators. 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 apply. SAE J1953 Revised JUN20
11、12 Page 2 of 4 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 J1292 Automobile and Motor Coach Wiring SAE J1455 Recommended Environmental Practices fo
12、r Electronic Equipment Design in Heavy-Duty Vehicle ApplicationsSAE J1469 Air Brake Actuator Test Procedure, Truck-Tractor, Bus, and Trailers SAE J1817 Long-Stroke Air-Brake Actuator Marking 3. REQUIREMENTS 3.1 Stroke Indicator Mechanical Design Guidelines 3.1.1 The stroke indication shall occur at
13、+0 -3.8 mm (+0.00 -0.15 in) of the recommended readjustment stroke in Table 1 of SAE J1817. 3.1.2 The stroke indication shall be high visibility orange to red. See Figure 1. 3.2 Stroke Indicator Electrical Design Guidelines 3.2.1 The readjust stroke indication shall occur at +0 -3.8 mm (+0.00 -0.15
14、in) of the recommended readjustment stroke in Table 1 of SAE J1817. 3.2.2 Electrical system installation shall conform to SAE J1292, if applicable. 3.2.3 Electrical systems shall have a system function test capacity. 3.2.4 Any system that provides a driver-warning device in a distracting manner shal
15、l be provided with manual override which shall automatically reset each time the vehicle is shutdown or restarted. 3.3 Test Procedure 3.3.1 Mechanical Design Test per SAE J1469. 3.3.2 Electrical Design Test per SAE J1455. SAE J1953 Revised JUN2012 Page 3 of 4 FIGURE 1 - PUSHROD AT ZERO AND ACTUATED
16、STROKE SAE J1953 Revised JUN2012 Page 4 of 4 4. NOTES 4.1 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 TRUCK AND BUS BRAKE ACTUATOR COMMITTEE
