1、 SURFACE VEHICLE RECOMMENDED PRACTICE J1819 MAR2015 Issued 1990-11 Reaffirmed 2015-03 Superseding J1819 JUL1999 Securing Child Restraint Systems in Motor Vehicles RATIONALE J1819 has been reaffirmed to comply with the SAE five-year review policy. _ SAE Technical Standards Board Rules provide that: “
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3、views 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 publication may be reproduced, stored in a retrieval s
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5、icesae.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/J1819_201503 ForewordThe use of child restraint systems in motor vehicles is required by law in all fifty of the United States.Further
6、, add-on child restraint systems are required by Federal Motor Vehicle Safety Standard No. 213 to bedesigned to use the vehicle seat belt for attachment to the vehicle and vehicle seat. Accordingly, compatibilitybetween these restraint systems and vehicle seats and seat belts is necessary for their
7、proper functioning andperformance. To promote proper installation of child restraint systems in motor vehicles, it is important thatmanufacturers of both child restraint systems and vehicles design them to conform to this SAE RecommendedPractice. Child restraint systems and vehicle seats and seat be
8、lts having features that conform to this documentare more likely to be compatible with one another.1. ScopeThe scope of this SAE Recommended Practice is to promote compatibility between child restraintsystems and vehicle seats and seat belts. Design guidelines are provided to vehicle manufacturers f
9、or certaincharacteristics of seats and seat belts, and to child restraint system (CRS) manufacturers for correspondingCRS features so that each can be made more compatible with the other.The Child Restraint System Accommodation Fixture, shown in Figure 1, is used to represent a CRS to thedesigners o
10、f both the vehicle interior and the CRS for evaluation of each product for compatibility with theother. The features of the accommodation fixture are described as each is used. A CRS accommodationtemplate of transparent plastic, not shown, represents the side of the accommodation fixture for use ina
11、pproximating its installed position on design drawings.2. References2.1 Applicable PublicationsThe following publications form a part of this specification to the extent specifiedherein. The latest issue of SAE publications shall apply.2.1.1 SAE PUBLICATIONSAvailable from SAE, 400 Commonwealth Drive
12、, Warrendale, PA 15096-0001.SAE J1369Anchorage Provisions for Installation of Child Restraint Tether Straps in Rear SeatingPositionsSAE 870324Performance Evaluation of Child Restraints Relative to Vehicle Lap-Belt AnchorageLocation, Weber, K. and Radovich, V. G.FIGURE 1ACCOMMODATION FIXTURE_ SAE INT
13、ERNATIONAL J1819 Reaffirmed MAR2015 1 of 42.1.2 FEDERAL PUBLICATIONSAvailable from the Superintendent of Documents, U.S. Government Printing Office,Washington, DC 20402.FMVSS 208Occupant Crash ProtectionFMVSS 209Seat Belt AssembliesFMVSS 210Seat Belt AnchoragesFMVSS 213Child Restraint SystemsK. Webe
14、r and J. W. Melvin, “Dynamic Testing of Innovative Solutions to Child Occupant ProtectionProblems,“ Contract No. DTNH22-82-C-07176Ziegler, P. N. and Morris, J., “Compatibility of Child Safety Seats with Seat Belts in 1984 Model PassengerVehicles,“ Washington, D.C., NHTSA, Office of Driver and Pedest
15、rian Research, April 19843. The Vehicle SeatsA child restraint system is located and restrained in the vehicle by the seat surfaces andthe lap belt or lap portion of the seat belt. Cushion shape, stiffness, and location relative to the lap belt contactpoints are characteristics significant to child
16、restraint system installation and performance. They are evaluatedby first locating the accommodation fixture on the seat so that its central vertical longitudinal plane is coincidentwith that of the seating position within 25 mm (1.0 in), and then securing it with the lap belt or lap belt portionof
17、the seat belt passed about the belt path through slots B. Because of the variety and variability of thematerials and manufacturing methods used in vehicle seat construction, it is recommended that for thefollowing evaluations, a cotton muslin cloth or sheet be placed on the seat back and cushion bef
18、ore theaccommodation fixture is installed on the seat, and that three trials be conducted for each evaluation, eachbeginning with the installation of the accommodation fixture.Adjustable seats are placed in the mid-position, or alternately, at the position recommended by themanufacturer when the sea
19、t is used with child restraints. Adjustable seat backs are placed at themanufacturers design position, and seat belt tension, measured in the belt between the two slots B, isadjusted to 60 N 5 N (13.5 lbf 1.0 lbf) for these evaluations.To assure compatibility between the vehicle seat and child restr
20、aint systems, the vehicle seat cushion shallmeet the requirements of 3.1 and 3.2.3.1 Seat Cushion ShapeThe shape of the seat cushion shall be such that not less than 85% of the area of thebottom surface (including the edges of the side members) of the accommodation fixture, when the area isprojected
21、 perpendicularly from that surface, falls upon the surface of the seat cushion.3.2 Seat Cushion StiffnessThe stiffness of the seat cushion shall be such that the angular deflection of theaccommodation fixture is not more than 12 degrees when a force of 155 N 5 N (35 lbf 1 lbf) is appliedhorizontally
22、 (5 degrees) forward at point F (Figure 1).4. The Vehicle Seat BeltsSeat belt adjustment hardware, supporting trim, webbing length, and the location ofthe contact points, those points where the seat belt webbing longitudinal centerline makes contact withattachment hardware such as a swivel plate, al
23、l influence the installation and performance of a CRS. Therelationships of these features to one another, to the seating position, and to the CRS are evaluated with theaid of the accommodation fixture installed on the vehicle seat as in 3.To assure compatibility between the vehicle seat belts and ch
24、ild restraint systems, the vehicle seat belts shallmeet the requirements of 4.1 through 4.6. Where a manufacturer provides a supplementary lap belt for usewith child restraints at front seating positions equipped with automatic belt systems, the supplementary beltshall be used for these evaluations.
25、4.1 Lap Belt LengthThe length of the lap belt or the lap portion of the seat belt shall be sufficient to pass aroundthe maximum belt length path through slots B of the accommodation fixture when buckled (approximately1040mm (41 in)._ SAE INTERNATIONAL J1819 Reaffirmed MAR2015 2 of 44.2 Buckle or Lat
26、ch Plate SizeThe size of the buckle or latch plate which must pass through a CRS shall besuch that it passes freely through an opening measuring 40 mm x 80 mm (1.57 in x 3.15 in), such asopening(s) C in the accommodation fixture.4.3 Minimum Belt LengthThe vehicle manufacturer must assure that the se
27、at belt automatic-locking retractor,where employed, will latch when the belt is buckled over a 50th percentile 6-year-old dummy, as required byFMVSS 208. The minimum length belt path through the openings L and M and the slot D in the centerreinforcement of the accommodation fixture, approximately 47
28、5 mm (19 in) in length, represents that minimumbelt length over the 6-year-old dummy.4.4 Buckle-Latch Plate Assembled LengthTo assure buckle accessibility, ease of belt adjustment, and properadjustable latch plate function, the buckle-latch plate assembled length shall meet the requirement of either
29、4.4.1 or 4.4.2.4.4.1 The buckle-latch plate assembled length shall be such that the end of the latch plate is within the circularsegment having a radius of 205 mm (8.0 in) and a center at a point 65 mm (2.6 in) to the right of Point A inFigure 1, when viewed from the side and perpendicular to the su
30、rface of the fixture.4.4.2 The buckle-latch plate assembled length shall be such that belt tension is maintained when theaccommodation fixture is restrained by the seat belt passed through the openings C and adjusted to atension of 60 N 5 N (13.5 lbf 1.0 lbf) measured between the openings C.4.5 Mean
31、s for Locking the Lap BeltTo assure that the belt can be and will remain properly adjusted about aCRS, seat belts that incorporate an emergency locking retractor in either the lap belt, the lap portion of a lap/shoulder belt, or in the shoulder portion of a lap/shoulder belt when equipped with a fre
32、e-sliding latch plate,shall be provided with a means for locking the lap belt or fixing the length of the lap belt or lap portion whenused with a CRS.4.6 Seat Belt Contact PointsTo assure that a properly installed CRS is securely restrained by the seat belt andcannot be readily displaced by the inst
33、aller, the seat belt contact points shall meet the requirement of either4.6.1 or 4.6.2, and, if applicable, 4.6.3.The corresponding requirement necessary to overcome the potentially adverse influence of supporting trimsuch as belt sleeves is indicated for each of the alternative requirements. Suppor
34、t trim designed to position thebuckle or latch plate more forward than the plane through point(s) A for occupant accessibility sometimes doesnot allow the installer to properly tighten the belt about a CRS.4.6.1 Seat belt contact points and the point at which the centerline of the webbing emerges fr
35、om adjacent supporttrim, if any, shall be at or rearward of the point(s) A on both sides of the accommodation fixture.4.6.2 Seat belt contact points and adjacent belt support trim shall be such that the horizontal forward displacementof the accommodation fixture is not more than 50 mm (2.0 in), meas
36、ured at point H when a force of 155 N 5 N (35 lbf 1.0 lbf) is applied horizontally (5 degrees) forward at point H, and the fixture is restrained bythe seat belt passed through the openings C and adjusted to a tension of 60 N 5 N (13.5 lbf 1.0 lbf),measured between the openings C.4.6.3 Where seat bel
37、t contact points do not lie in the same vertical lateral plane, the horizontal forwarddisplacement of the side of the fixture that is adjacent to the more forward contact point shall be not morethan 50 mm (2.0 in) measured at the side of the fixture when a force of 77 N 5 N (17 lbf 1 lbf) is applied
38、horizontally (5 degrees) forward at point J or K, as appropriate, and the fixture is restrained by the seat beltpassed through the openings C and adjusted to a tension of 60 N 5 N (13.5 lbf 1.0 lbf), measuredbetween the openings C._ SAE INTERNATIONAL J1819 Reaffirmed MAR2015 3 of 45. The Child Restr
39、aint SystemThe child restraint system is evaluated for compatibility with vehicle seats andlap belts by comparison to the CRS accommodation fixture as installed in one or more representative vehicleseating positions or in a seat/seat belt configuration constructed so as to meet the requirements prev
40、iously. Toassure compatibility between the CRS and vehicle seats and seat belts, the CRS shall meet the requirementsof 5.1 through 5.3.5.1 Seat Belt Path LocationTo correspond to the maximum buckle-latch plate assembled length requirementof 4.4, the point in the side of the CRS where the seat belt c
41、hanges direction to pass through or over the CRSstructure shall be not less than 200 mm (8.0 in) from Point A. Alternately, where the change of direction of thebelt path is over a large radius element of the CRS, the change in direction in the first 200 mm (8.0 in) fromPoint A must be such that the
42、angle of the belt with respect to an adjustable latch plate is not greater than30degrees, which is the angle above which the latch plate is tilted for adjustment purposes.5.2 Seat Belt Path LengthTo correspond to the requirements of FMVSS 208 for automatic locking retractoroperation and maximum seat
43、 belt length, respectively, the seat belt path length through or around the CRSshall be at least equal to that measured over the slot D in the center reinforcement in the accommodationfixture as described in 4.3, and not more than that measured over the slots B.5.3 Seat Belt Path FeaturesTo assure t
44、hat the requirements are as those considered good practice forautomotive seat belt hardware, the seat belt path features shall be such that the minimum radius over whichthe belt must pass is 1.5 mm (0.06 in).PREPARED BY THE SAE CHILDRENS RESTRAINTS SYSTEMS STANDARDS COMMITTEE_ SAE INTERNATIONAL J1819 Reaffirmed MAR2015 4 of 4
