SAE J2494-3-2002(R 2007)

SAE 美国 汽车 行业 标准

SURFACE VEHICLE STANDARD

J2494-3

REV. AUG2007

Issued 2002-07

Revised 2007-08

Superseding J2494-3 JUL2002

Performance Requirements for SAE J844 Non-Metallic Air Brake Tubing and Push to Connect Fitting Assemblies Used in Vehicular Air Brake Systems

RATIONALE

The modifications to this document are to harmonize the requirements of SAE J1131 and SAE J2494-3 where applicable. 1. SCOPE

This SAE Standard is intended to establish uniform performance criteria and methods of testing push to connect tube fittings, with SAE J844 air brake tubing as used in vehicular air brake systems.

The specific tests and performance criteria applicable to the tubing are set forth in SAE J844. The test values contained in this performance standard are for test purposes only. For environmental and usage limitations, see SAE J844. 1.1 General Requirements

a. Test temperature shall use ±3 °C as the test tolerance range. b. Ambient temperature shall be 24 °C.

c. All test times are minimum times unless otherwise specified. d. Dry Air shall be a minimum of –50 °C dew point. e. Tubing shall be cut square at 90 degrees ± 7 degrees.

f. Precondition all test specimens at 700 kPa ± 70 kPa for 30 s without any leakage. g. New specimens shall be used for all tests. 2. REFERENCES

2.1 Applicable Publications

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 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 therefrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright © 2007 SAE International

All rights 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 and Canada)

Tel: 724-776-4970 (outside USA)

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SAE 美国 汽车 行业 标准

2.1.1 SAE Publications

Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), . SAE J844 SAE J2024 SAE J2494-1 SAE J2494-2 SAE J2494-4

Nonmetallic Air Brake System Tubing

Contaminants for Testing Air Brake Components and Auxiliary Pneumatic Devices

Dimensional Specifications for Metallic Body Push-to-Connect Fittings Used on a Vehicular Air Brake System

Dimensional Specifications for Non-Metallic Body Push-to-Connect Fittings Used on a Vehicular Air Brake System Cartridge Cavity

SAE HS J806 SAE Oil Filter Procedure 2.1.2 ASTM Publications

Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, . ASTM B 117

Salt Spray (Fog) Testing

ASTM D 4329 Standard Practice for Fluorescent UV Exposure of Plastics ASTM G 53 ASTM G 151 ASTM G 154

Practice for Operating Light- and Water-Exposure Apparatus (Fluorescent UV-Condensation Type) for

Exposure on Nonmetallic Materials

Standard Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light Sources

Practice for Operating Fluorescent Light Apparatus for UV Exposure of Nonmetallic Materials

2.1.3 Federal Publication

Available from the Superintendent of Documents, U.S. Government Printing Office, Mail Stop: SSOP, Washington, DC 20402-9320.

DOT FMVSS 571.106 (49CFR 571.106)

Brake Hoses

3. REQUIREMENTS FOR METALLIC AND NON-METALLIC FITTINGS 3.1

Tensile Tests (15 specimens)

3.1.1 Description

Both hot and cold tensile tests shall be conducted with different unaged assemblies (fittings attached within 30 days of test date). Tests consist of subjecting the assembly to increasing tensile load in a suitable testing machine until the specified force value or elongation percentage has been obtained.

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SAE 美国 汽车 行业 标准

3.1.2 Apparatus

A tensile test machine with suitable indicating device shall be used for the tensile test. The fixtures for holding the test specimens shall be arranged so the tubing and fittings have a straight centerline corresponding to the direction of the machine pull. The lower part of the fixture shall be equipped with a container of sufficient dimensions to submerge the required length of tubing in water. A means of heating the water to boiling shall be provided. A cover shall not be used on the container. This allows the steam to dissipate into the environment. If a fan is used in this test, then take precautions to direct the air away from the test specimen. 3.1.3 Test Specimens

The tubing specimens (a minimum of 15) shall be obtained from current production stock and cut to a length sufficient to obtain 150 mm ± 6 mm of tubing between end fittings after assembly. Assemble fittings to the tubing using the manufacturer's recommendations. 3.1.4 3.1.4.1

Procedure (15 specimens)

High Temperature Tensile Test (5 specimens)

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