1、 SURFACE VEHICLE RECOMMENDED PRACTICE J44 FEB2015 Issued 1973-10 Reaffirmed 2015-02 Superseding J44 FEB2009 Service Brake System Performance Requirements - Snowmobiles RATIONALE J44 has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE This SAE Recommended Practice establishes
2、 performance requirements for hand-operated brake systems on recreational, noncompetition snowmobiles. 2. REFERENCES 2.1 Applicable Publication The following publication forms a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publication
3、 shall apply. 2.1.1 SAE Publication 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 J45 Brake System Test ProcedureSnowmobiles 2.2 Related Publication The following publicat
4、ion is provided for information purposes only and is not a required part of this specification. 2.2.1 SAE Publication 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 J1282 S
5、nowmobile Brake Control Systems _ 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 p
6、atent infringement arising therefrom, 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 2015 SAE International All ri
7、ghts reserved. No part of this publication 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
8、 and Canada) Tel: +1 724-776-4970 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J44_201502 SAE INTERNATIONAL J44 Reaffirmed FEB20
9、15 Page 2 of 3 3. GENERAL REQUIREMENT The brake systems shall be functional under winter operating conditions. 4. PERFORMANCE REQUIREMENTS When subjected to the test procedures given in SAE J45, the following requirements must be satisfied by the service brake system: 4.1 Preburnish Check 4.1.1 No c
10、omponent failure shall occur during the 400 N (90 lb) force application. 4.1.2 Deceleration shall be at least 3 m/s2(10 ft/s2). 4.2 Burnish Procedure No unusual variations in deceleration versus brake lever force shall occur during the burnishing operation. 4.3 Effectiveness Test 4.3.1 Testing shall
11、 result in an average deceleration of at least 6 m/s2(20 ft/s2) or a locked track, if 6 m/s2(20 ft/s2) is unobtainable, from initial vehicle speeds of 32 and 64 km/h (20 and 40 mph). 4.3.2 During all phases of the test, no condition shall be permitted to cause the vehicle to lose stability due to tr
12、ack skid, to overturn, or to pull or swerve out of a test lane 1.2 m (4 ft) wider than the vehicle. 4.4 Water Test Deceleration shall be at least 3 m/s2(10 ft/s2). 4.5 Fade and Recovery Test 4.5.1 Fade Test Each stop shall be achieved with a deceleration of at least 4.6 m/s2(15 ft/s2). 4.5.2 Recover
13、y Test Testing shall result in an average deceleration of at least 6 m/s2(20 ft/s2) or a locked track, if 6 m/s2(20 ft/s2) is unobtainable, from an initial vehicle speed of 64 km/h (40 mph). 4.6 Final Inspection 4.6.1 Unusual wear, scores, or cracks of the brake friction material which may interfere
14、 with braking function shall be reason for rejection. 4.6.2 All components of the brake system shall be intact and functional. SAE INTERNATIONAL J44 Reaffirmed FEB2015 Page 3 of 3 5. NOTES 5.1 Marginal Indicia A change bar (I) located in the left margin is for the convenience of the user in locating
15、 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 SNOWMOBILE SUBCOMMITTEE OF THE SAE SPECIAL PURPOSE VEHICLE, ENGINE AND EQUIPMENT COMMITTEE REAFFIRMED BY THE SAE SNOWMOBILE TECHNICAL COMMITTEE
