1、_ 6$(7HFKQLFDO6WDQGDUGV%RDUG5XOHVSURYLGHWKDW7KLVUHSRU WLVSXEOLVKHGE6$(WRDGYDQFHWKHVWDWHRIWHFKQLFDODQGHQJ Lneering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising tKHUHIURPLVWKHVROHUHVSRQVL
2、ELOLWRIWKHXVHU 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 2016 SAE International All rights reserved. No part of this publication may be reproduced, st
3、ored 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 (outside USA) Fax: 724-776-079
4、0 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/J1817_201603 SURFACE VEHICLE RECOMMENDED PRACTICE J1817 MAR2016 Issued 1991-06 Revised 2016-03 Superseding J1817
5、DEC2012 Long-Stroke Air-Brake Actuator Marking RATIONALE SAE must make this change in SAE J1817 before FMCSA will initiate action to correct CFR Part 393.47, which will permit CVSA to revise the OOS roadside inspection regulations. Consistency with the new stroke marking standard in J2899 will be re
6、quired. 1. SCOPE This SAE Recommended Practice describes a marking system to distinguish long-stroke from standard stroke for service, parking, and combination air-brake actuators, roto-chambers, and components. Said actuators are used for applying cam and disc-type foundation brakes by slack adjust
7、er means. 1.1 Purpose This document establishes a uniform marking system to identify long-stroke actuators and components used in air-brake systems. 2. REFERENCES 2.1 Applicable Document The following publications form a part of this specification to the extent specified herein. Unless otherwise ind
8、icated, the latest issue of SAE publications 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 J1469 Air-Brake Actuator Test Procedure, Truc
9、k, Tractor, Bus, and Trailers SAE INTERNATIONAL J1817 MAR2016 Page 2 of 8 2.2 Related Publication The following publication is provided for information purposes only and are not a required part of this SAE Technical Report. 2.2.1 SAE Publication Available from SAE International, 400 Commonwealth Dri
10、ve, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. SAE J1953 Brake-Stroke Indicator Design Guideline for Cam or Disc Air-Brake Actuators 3. DEFINITIONS 3.1 RATED STROKE The minimum design stroke of a unit as listed in Table 1. 3.2 STA
11、NDARD STROKE ACTUATORS Brake actuators having a rated stroke as listed in Table 1A, Column 1. 3.3 LONG-STROKE ACTUATORS a. Class I - An actuator having a stroke 6.4 to 12.4 mm (0.25 to 0.49 in) greater than standard rated stroke. Refer to Table 1B. b. Class II - An actuator having a stroke 12.7 to 1
12、8.8 mm (0.50 to 0.74 in) greater than standard rated stroke. Refer to Table 1B. c. Class III - an actuator having a stroke 19 mm (0.75 in) greater than standard rated stroke. Refer to Table 1B. SAE INTERNATIONAL J1817MAR2016Page3 of 8 Table 1A - Recommendedair-brake actuator service stroke- clampban
13、d/sealed designs- standard stroke Type(Size)StandardRated Stroke mmStandardRated Stroke in Brake Adjustment Limit For StandardRated Stroke mmBrake Adjustment Limit For StandardRated Stroke in 9 44.5 1.75 35.1 1.38 1244.5 1.75 35.1 1.38 1657.2 2.25 44.5 1.75 2057.2 2.25 44.5 1.75 2463.5 2.50 50.8 2.0
14、0 3063.5 2.50 50.8 2.00 3676.2 3.00 63.5 2.50 Table 1B - Recommendedair-brake actuator service strokeclampband/sealed designs- long-stroke brake actuatorsType(Size)Class lStd.+ 8.4mm (0.25 in)MinimumRated Stroke mmClass lStd.+ 8.4mm (0.25 in)MinimumRated Stroke in Class lStd.+ 8.4mm (0.25 in) Brake
15、Adjustment Limit mmClass lStd.+ 8.4mm (0.25 in) Brake Adjustment Limit in Class IlStd.+ 12.7 mm(0.50 in) MinimumRated Stroke mmClass ll Std.+ 12.7 mm(0.50 in)MinimumRated Stroke in Class ll Std.+ 12.7 mm(0.50 in)Brake Adjustment Limit mmClass ll Std.+ 12.7 mm(0.50 in)Brake Adjustment Limit in Class
16、lll Std.+ 19.0 mm(0.75 in)MinimumRated Stroke mmClass Ill Std.+ 19.0 mm(0.75 in)MinimumRated Stroke in Class lll Std.+ 19.0 mm(0.75 in)Brake Adjustment Limit mmClass Ill Std.+ 19.0 mm(0.75 in)Brake Adjustment Limit in 9 50.8 2.00 38.1 1.51250.8 2.00 38.1 1.51663.5 2.50 50.8 2.069.9 2.75 57.2 2.25 20
17、63.5 2.50 50.8 2.069.9 2.75 57.2 2.25 76.2 3.00 63.5 2.50 2469.9 2.75 57.2 2.25 76.2 3.00 63.5 2.50 3069.9 2.75 57.2 2.25 76.2 3.00 63.5 2.50 3682.6 3.25 66.5 2.62 88.9 3.50 69.9 2.75 SAE INTERNATIONAL J1817 MAR2016 Page 4 of 8 Table 1C - Recommended air-brake actuator service stroke roto-chamber de
18、signs Type (Size) Rated Stroke mm Rated Stroke in Brake Adjustment Limit mm Brake Adjustment Limit in 9 50.8 2.00 38.1 1.50 12 50.8 2.00 38.1 1.50 16 63.5 2.50 47.8 1.88 20 63.5 2.50 47.8 1.88 24 63.5 2.50 47.8 1.88 30 76.2 3.00 57.2 2.25 36 88.9 3.50 66.5 2.62 50 101.6 4.00 76.2 3.00 4. GENERAL Lon
19、g-stroke air-brake actuators have pushrod stroke capabilities in excess of standard stroke actuator designs. As some of these chambers are nearly identical in exterior appearance to the standard chambers, a unique marking system is needed for the purpose of identification by mechanics, inspectors, a
20、nd others in the field. This marking will help assure both types of actuators are serviced correctly and that brakes are adjusted properly. Unique long-stroke actuator components are not interchangeable between actuator manufacturers nor standard actuator components. 5. REQUIREMENTS 5.1 Identificati
21、on - Long-Stroke Actuators There are three methods described as follows, for differentiating long-stroke from standard stroke actuators. Long-stroke actuators should incorporate at least two of the three methods and 76.2 mm (3.00 in) long-stroke actuators must use square inlet ports per 5.1.3. 5.1.1
22、 Servicing Instructions Service instructions embossed or stamped on spring brake center sections, service chamber pressure caps or in the case of the tie rod style chamber (see Figure 1), the markings will be located on the end cap. These instructions will instruct that long-stroke diaphragms are re
23、quired for replacement. Numerical values shall be in mm and inches. (See Figures 1, 2, and 3). Figure 1 - Tie rod style piston brake chamber SAE INTERNATIONAL J1817 MAR2016 Page 5 of 8 Figure 2 - 76.2 MM (3.00 IN) long-stroke spring brake chamber identification Figure 3 - 76.2 MM (3.00 IN) long-stro
24、ke service chamber identification 5.1.2 Tags A tag (typically trapezoidal) shall be secured to the service chamber clamp band bolts or attached/affixed to the service chamber by a suitable means. The actuators rated stroke shall be embossed or otherwise readable within the trapezoidal area with nume
25、rical values in millimeters and inches. For actuators without clamp bands, the same information is to be provided in a highly visible alternative directly on the actuator. SAE INTERNATIONAL J1817 MAR2016 Page 6 of 8 5.1.3 Square Air Port and/or Pressure Cap Embossment All 76.2 mm (3.00 in) long-stro
26、ke actuators shall have square inlet ports. The top port of the service chambers shall have a square embossment that is clearly visible and cannot be obscured by paint or square port can be used. (See Figures 1, 2, and 3). 5.2 Components unique to the long-stroke actuator shall have suitable text pe
27、rmanently marked on the components in order to identify them as long-stroke. Typical components might include (refer to Figure 4): a. Diaphragm b. Center section c. Pressure cap service chamber d. End cap combination e. Non-pressure housing f. Service pushrod SAE INTERNATIONAL J1817 MAR2016 Page 7 o
28、f 8 Figure 4 - Unique components - long-stroke actuators SAE INTERNATIONAL J1817 MAR2016 Page 8 of 8 5.3 Long-Stroke Air-Brake Actuator identifiers referred to in 5.1, must meet test requirements per SAE J1469 as assembled on or as part of test units. 6. NOTES 6.1 Marginal Indicia A change bar (l) l
29、ocated 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
