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 there
2、from, 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 2011 SAE International All rights reserved. No part of this publication m
3、ay 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 (outside U
4、SA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedbackon this Technical Report, please visit http:/www.sae.org/technical/standards/J278_201103 SURFACE VEHICLE RECOMMENDED PRACTICE J278 MAR2011 Issued 1971-12 Reaffirmed 2011-0
5、3 Superseding J278 MAR2006 Snowmobile Stop Lamp RATIONALE No changes have been made to this d cument. FOREWORD This SAE Recommended Practice is intended as a guide toward standard practice, but may be subject to frequent change to keep pace with experience and technical advances. Hence, its use wher
6、e flexibility of revision is impractical is not recommended. 1. SCOPE This document provides test methods and requirements for the stop lamp on snowmobiles. 2. REFERENCES 2.1 Applicable Publications The following publications form a part of this specification to the extent specified herein. The late
7、st issue of SAE publications shall apply. 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), www.sae.org. SAE J567 Lamp Bulb Retention System SAE J575 Test Methods and Equipment for Li
8、ghting Devices and Components, for use on Vehicles Less than 2032 mm in Overall Width SAE J576 Plastic Materials for Use in Optical Parts Such as Lenses and Reflectors of Motor Vehicle Lighting Devices SAE J578 Color Specifications oSAE J278 Reaffirmed MAR2011 Page 2 of 5 3. DEFINITIONS 3.1 Stop Lam
9、p Lamp giving a steady light to the rear of a vehicle to indicate the intent of the operator of a vehicle to stop or diminish speed. 3.2 Multiple-Compartment Lamp A device which gives its indication by two or more separately lighted areas which are joined by one or more common parts such as a housin
10、g or lens. 3.3 Multiple Lamp Arrangement An array of two or more separated lamps on each side of the snowmobile which operate together to give a signal. 4. LABORATORY REQUIREMENTS 4.1 A multiple compartment lamp or multiple lamps may be used. 4.2 The following sections from SAE J575 are a part of th
11、is document. 4.2.1 Section 3 Definitions. 4.2.2 Section 3.2 Bulbs. 4.2.3 Section 4.1 Vibration Test. 4.2.4 Section 4.2 Moisture Test. 4.2.5 Section 4.3 Dust Test. 4.2.6 Section 4.4 Corrosion Test. 4.2.7 Section 4.5 Photometry. 4.2.8 Section 4.6 Warpage Test on Devices with Plastic Components, except
12、 that the lamp is to be operated 5 min on and 5 min off until the total time equals 1 h. If the tail lamp and/or side marker lamps are incorporated in the same device, they shall be operated continuously during the test. (The test is to be conducted in a circulating air type oven.) SAE J278 Reaffirm
13、ed MAR2011 Page 3 of 5 4.3 Plastic Materials Any plastic materials used in optical parts shall comply with the requirements set forth in SAE J576. 4.4 Color Test The color of the light from a tail lamp shall be red. (See SAE J578.) 4.5 If the stop lamp is optically combined with the tail lamp and a
14、two-filament bulb is used, the bulb shall have an indexing base and the socket shall be designed so that bulbs with nonindexing bases cannot be used. As a matter of information, attention is called to typical sockets shown in SAE J567. 4.6 Photometric Requirements 4.6.1 All beam candela measurements
15、 shall be made with the incandescent filament of the signal lamp at least 3.05 m (10 ft) from the photometer screen. The H-V axis shall be taken as parallel to the longitudinal axis of the vehicle. When compartments or lamps are photometered together, the H-V axis shall intersect the midpoint betwee
16、n the optical center (filament). 4.6.2 Beam candela measurements of multiple compartment lamp(s) or multiple lamp arrangements shall be made by either of the following methods: a. All compartments or lamps may be photometered together, provided that a line from the optical center (filament) of each
17、compartment or lamp to the center of the photometer sensing device does not make an angle of more than 0.6 degree with the photometer (H-V) axis. b. Each compartment or lamp may be photometered separately by aligning its axis with the photometer and adding the value at each test point. 4.6.3 Table 1
18、 lists design candela requirements for a stop lamp. SAE J278 Reaffirmed MAR2011 Page 4 of 5 TABLE 1 - MINIMUM DESIGN CANDELA REQUIREMENTS Test Points, degrees Test Points, degrees Lighted Sections 1 Lighted Sections 2 Lighted Sections 3 10L 5 6 8 V 13 15 18 10U and 10D 10R 5 6 8 20L 5 6 8 10L 15 18
19、20 5L 25 30 35 V 35 41 48 5R 25 30 35 10R 15 18 20 5U and 5D 20R 5 6 8 20L 8 9 10 10L 20 24 28 5L 40 48 55 V 40 48 55 5R 40 48 55 10R 20 24 28 H 20R 8 9 10 NOTE 1: Specifications are based on laboratories using accurate, rated bulbs during testing. NOTE 2: Lamps designed to operate on the vehicle th
20、rough a resistor or equivalent shall be photometered with the listed design voltage of the design source applied across the combination of resistance and filament. NOTE 3: A multiple device signaling unit gives its indication by two or more separately lighted sections which may be separate lamps or
21、areas that are joined by common parts. The photometric values are to apply when all sections which provide the same signal are considered as a unit. NOTE 4: When a tail lamp is combined with the stop lamp, the stop lamp shall not be less than three times the candela of the tail lamp at any test poin
22、t on or above horizontal; except that at H-V, H-5L, H-5R, and 5U-V, the stop lamp shall not be less than five times the candela of the tail lamp. 5. INSTALLATION REQUIREMENTS The following requirements apply to the device as used on the snowmobile and are not part of the laboratory test requirements
23、 and procedures. SAE J278 Reaffirmed MAR2011 Page 5 of 5 Visibility of the stop lamp shall not be obstructed by any part of the snowmobile throughout the photometric test angles for the lamp, unless the lamp is designed to comply with all photometric and visibility requirements with these obstructio
24、ns considered. Signal from lamps on both sides of the snowmobile shall be visible through a horizontal angle from 45 degrees to the left to 45 degrees to the right. Where more than one lamp or optical area is lighted on each side of the snowmobile, only one such area on each side need comply. To be
25、considered visible, the lamp must provide an unobstructed projected illuminated area of outer lens surface, excluding reflex, at least 13 cm2(2 in2) in extent, measured at 45 degrees to the longitudinal axis of the vehicle. 6. NOTES 6.1 Marginal Indicia The change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions have been made to the previous issue of the report. An (R) symbol to the left of the document title indicates a complete revision of the report. PREPARED BY THE SAE SNOWMOBILE COMMITTEE
