SAE J 294-2004 Service Brake Structural Integrity Test Procedure - Vehicles Over 4500 kg (10 000 lb) GVWR《超过4500 kg (10 000 lb) GVWR的车辆的辅助制动结构一体化试验规程》.pdf
《SAE J 294-2004 Service Brake Structural Integrity Test Procedure - Vehicles Over 4500 kg (10 000 lb) GVWR《超过4500 kg (10 000 lb) GVWR的车辆的辅助制动结构一体化试验规程》.pdf》由会员分享,可在线阅读,更多相关《SAE J 294-2004 Service Brake Structural Integrity Test Procedure - Vehicles Over 4500 kg (10 000 lb) GVWR《超过4500 kg (10 000 lb) GVWR的车辆的辅助制动结构一体化试验规程》.pdf(7页珍藏版)》请在麦多课文档分享上搜索。
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 ther
2、efrom, 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 rights reserved. No part of this
3、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 and Canada) Tel: +1 724-776-49
4、70 (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/J294_201506 SURFACE VEHICLE RECOMMENDED PRACTICE J294 JUN2015 Issued 1972-07 Rea
5、ffirmed 2015-06 Superseding J294 MAY2011 Service Brake Structural Integrity Test Procedure - Vehicles Over 4500 kg (10 000 lb) GVWR RATIONALE J294 has been reaffirmed to comply with the SAE five-year review policy. 1. Scope This SAE Recommended Practice establishes a method of testing the structural
6、 integrity of the brake system of all new trucks, buses, and combination vehicles designed for roadway use and falling in the following classifications: a. Truck and BusOver 4500 kg (10 000 lb) GVWR b. Combination vehicleTowing vehicle over 4500 kg (10 000 lb) GVWR The test consists of two distinct
7、tests: a Structural Endurance Test followed by a Structural Ultimate Strength Test. NOTEThese two tests originated from separate procedures, and were combined in this Recommended Practice. Each test can be considered to be an independent evaluation of the service brakes structure. Based on time avai
8、lable, cost limitations, and the desired evaluation and historical data available, either of these tests could be considered as a complete evaluation of the brakes structure. 1.1 Purpose The main purpose of the document is to evaluate the structural integrity of a vehicles braking system. However, o
9、ther areas such as the steering or suspension system may also be evaluated during the test provided that the criteria and procedure detailed as follows are not modified in any way. For repeatability, it is recommended that a brake apply device be utilized whenever possible, since it would eliminate
10、the variations in application times and efforts of different operators. 2. References 2.1 Applicable Publications The following publications form a part of the specification to the extent specified herein. Unless otherwise indicated the lastest revision of SAE publications shall apply. 2.1.1 SAE PUB
11、LICATIONS Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. SAE J2115Brake Performance and Wear Test CodeCommercial Vehicle Inertia Dynamometer SAE J1404Service Brake Structural Integrity RequirementsVehicles Over 4500 kg (10 000 lb) GVWR SAE J1626Braking, Stability, and Control
12、 Performance Test Procedures for Air- and Hydraulic-Brake-Equipped Trucks, Truck-Tractors and Buses 2.2 Related Publications The following publications are provided for information purposes only and are not a required part of this document. 2.2.1 FMVSS PUBLICATIONS Available from the Superintendent
13、of Documents, U.S. Government Printing Office, Washington, DC 20402. FMVSS 105Hydraulic and Electric Brake Systems FMVSS 121Air Brake Systems 3. Equipment 3.1 Brake Apply Device (Optional but recommended for hydraulic braked vehicles) 3.2 Calibrated Speedometer and Odometer 3.3 Service (Application)
14、 Pressure Gauges 3.4 Pedal Force Transducer (Hydraulic Brakes) 3.5 Stop Counter 3.6 Decelerometer (U-tube or Equivalent) 3.7 Ambient Temperature Gage 3.8 Recording Equipment Pedal force versus time for hydraulic braked vehicle, brake chamber pressure versus time for air brake vehicles. 3.9 Tire Pres
15、sure Gage 3.10 Wheel Alignment Equipment (When steering and suspension system are also tested) _ SAE INTERNATIONAL Reaffirmed J294 JUN2015 2 of 73.11 Torque Wrench 3.12 Direct Reading Temperature Instrument (Brake lining temperature) 4. Test Preparation 4.1 Calibrate instrumentation as required and
16、note calibration on data sheet. 4.2 Install new brake drums and/or rotors, brake assemblies and fasteners to the manufacturers specifications, except all brake fasteners shall be at minimum specified torque on one side of the vehicle and at maximum specified torque on the other side. Record torque v
17、alues. Record pertinent brake parameters and specifications. 4.3 Adjust brakes per manufacturers specifications. 4.4 (Optional) Check wheel geometry of all axles and adjust to manufacturers mean specifications and record. 4.5 Vehicle test weight to be Gross Vehicle Weight Rating (GVWR) or Gross Comb
18、ination Weight Rating (GCWR) within 2%. Each axle should be loaded to the Gross Axle Weight Rating (GAWR) 5%. However, if the sum of the GAWR exceeds the GVWR 5% or GCWR 5%, the load should be distributed over each axle in proportion to the GAWR/GAWR SUM ratios 5%. If so desired, this test can be ru
19、n at a 10% overload. NOTEIn comparing test results between different vehicles or components, only tests with like loading should be compared. 4.6 Install the tires and wheels offered by the manufacturer which produce the largest moment of inertia effect for the vehicle. Tires must be in good conditi
20、on with a minimum of 6 mm (1/4 in) tread at all times during the test. Set tire pressure per manufacturers specifications for GAWR. 4.7 Install plug-type thermocouple in the most heavily loaded shoe or outboard pad of each brake per SAE J2115. 4.8 For those vehicles which are equipped with power (ai
21、r or hydraulic) or power assist brake actuation, the reserve pressure should be set at the vehicle manufacturers maximum recommended cut-out pressure. 5. General Notes 5.1 All tests are conducted on a 12 ft (+0/-2 in.) wide level (no more than 1% grade in all directions, including crown), straight r
22、oadway having a peak friction coefficient (PFC) of 0.9 (dry Portland cement concrete or equivalent surface). _ SAE INTERNATIONAL Reaffirmed J294 JUN2015 3 of 7Where vehicles are equipped with a wheel slip brake control system as standard equipment, the control system should be disabled during the te
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