SAE J 879B-1968 Motor Vehicle Seating Systems Recommended Practice《汽车座椅系统》.pdf

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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 entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefro

2、m, 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.QUESTIONS REGARDING THIS DOCUMENT: (724) 772-8512 FAX: (724) 776-0243TO PLACE A DOCUMENT

3、 ORDER; (724) 776-4970 FAX: (724) 776-0790SAE WEB ADDRESS http:/www.sae.orgCopyright 1968 Society of Automotive Engineers, Inc.All rights reserved. Printed in U.S.A.SURFACEVEHICLE400 Commonwealth Drive, Warrendale, PA 15096-0001RECOMMENDEDPRACTICESubmitted for recognition as an American National Sta

4、ndardJ879bREV.JUL68Issued 1963-11Revised 1968-07Superseding J879a NOV63MOTOR VEHICLE SEATING SYSTEMSForewordThis Document has not changed other than to put it into the new SAE Technical Standards BoardFormat.1. ScopeThis SAE Recommended Practice establishes uniform test procedures and certain minimu

5、mperformance requirements for motor vehicle seats and seat adjusters. It is limited to tests that can beconducted on uniform test fixtures and equipment available in commercial laboratory test facilities. Thispractice includes a minimum requirement for horizontal forward loads encountered in vehicle

6、 forward impacts,and horizontal loads obtained by impacting the vehicle from the rear. The requirements and test procedures inthis recommended practice reflect current technology and industry experience. It is intended to subject thisrecommended practice to a continuing review and revision as techno

7、logy advances and experience isexpanded.2. References2.1 Applicable PublicationsThe following publications form a part of the specification to the extent specifiedherein. Unless otherwise indicated the latest revision of SAE publications shall apply.2.1.1 SAE PUBLICATIONSAvailable from SAE, 400 Comm

8、onwealth Drive, Warrendale, PA 15096-0001.SAE J787Motor Vehicle Seat Belt AnchorageSAE J826Devices for Use in Defining and Measuring Vehicle Seating Accommodation3. Definitions3.1 Motor Vehicle Seat SystemA structure engineered to seat the driver and/or passengers, including all pads,upholstery, dec

9、orative metal trim parts, and seat adjusters or supporting components.3.2 Seat AdjusterA device anchored to the structure which supports the seat frame assembly and provides forseat adjustments in the longitudinal and/or vertical direction. This includes any track, link, or power actuatingassemblies

10、 necessary to adjust the position of the seat.3.3 Seat FrameThe structural portion of a seat assembly. The frame may be constructed with springs attacheddirectly to the structural frame or with the springs attached as a separate assembly.3.4 Seat Back Frame Upper CrossbarThe uppermost horizontal str

11、uctural member of a seat back frame.SAE J879b Revised JUL68-2-3.5 Nonadjustable SeatA motor vehicle seat which does not have a seat adjuster as defined in paragraph 3.2.This also includes those seats capable of movement for stowing the seat or other items.3.6 Head RestraintA head restraint is a devi

12、ce attached to a seat back or the vehicle structure and designed toreduce rearward movement of the head.4. General Requirements4.1 Simulated Inertia LoadingEach seat system or applicable component, together with its attachments, shallbe capable of sustaining a horizontal forward and rearward (in rel

13、ation to the vehicle) static load, unlessotherwise noted below, when tested in accordance with 5.1.a. The seat frame shall not become detached from the seat adjuster or support system, and there shallbe no separation of the seat adjuster mechanism under loading equal to 20 times the weight of all se

14、atand seat adjuster components that are longitudinally adjustable.b. The seat system shall not become detached from the vehicle structure under loading equal to 20 timesthe weight of the applicable components.c. Restraining devices for folding seats or seat backs shall not become detached from the s

15、eat structureor disengaged under a horizontal forward load equal to 20 times the weight of the applicable fullytrimmed component.The seat adjusters or latching mechanisms need not be operable after the application of the test load. Theseload requirements are independent of any additional loads which

16、 may be imparted to the seat adjusters andseat frame due to seat belt installations. If seat belts are anchored to the seat system, SAE J787 should befollowed.4.2 Calculated Inertia Loading of Restraining Devices for Seat Backs and Folding SeatsRestrainingdevices for seat backs and folding seats in

17、the vehicle latched seat position, when evaluated by calculation,must remain in the latched position when subjected to an inertia load of 20 g in the forward direction withrespect to the seat (see Section 6.)4.3 Simulated Occupant LoadingEach seat system, together with its attachments, shall be capa

18、ble ofsustaining a rearward static moment (in relation to the longitudinal axis of the vehicle) about the seat “H“ point(see SAE J826) of 3300 in.-lb for each passenger for which the individual seat back is designed, when tested inaccordance with 5.2. Seat adjuster and reclining seat mechanism shall

19、 not disengage from their presentposition during application of the test moment.4.4 Simulated Occupant Loading of Head RestraintThe head restraint, its attachments, and designedsupporting structure shall sustain a minimum force equivalent to 3300 in.-lb about the seat “H“ point and shallnot fail pri

20、or to the seat back when subjected to a gradual increase in force up to a maximum of 200 lb whentested in accordance with 5.3.5. Test Procedures5.1 Simulated Inertia Loading5.1.1 ALL SEAT ADJUSTER AND SEAT FRAME COMBINATIONS, AND ALL NONADJUSTABLE FRONT SEATS AND FOLDINGSEATSa. A diagonal strut shou

21、ld be secured in place on each side of the test seat frame from a point in thesame horizontal plane as the c.g. of the fully trimmed seat frame to a point as far forward as possible ofthe seat adjuster attachments (See Figure 1).SAE J879b Revised JUL68-3-b. Adapt the test fixture to the subject seat

22、 adjusters or support system, seat frame (trimmed oruntrimmed), or frame and spring assembly and attachments. The seat adjusters or support systemshall be installed on the test fixture in the same relative position as in the vehicle. All attachments areto be at a minimum torque specification. FIGURE

23、 1SIMULATED INERTIA LOADINGc. The seat adjusters shall be located in the full forward and upward design position for forward loadingand in the full rearward and upward design position for rearward loading.d. The test load is to be applied in a horizontal forward and rearward direction through the pl

24、ane of thec.g. of a fully trimmed seat frame (see Figure 1).5.1.2 ALL NONADJUSTABLE INTERMEDIATE AND REAR SEATS AND ALL FOLDING SEAT BACKSa. A load carrying fixture, constructed in such a manner as to distribute the test loads into the applicablecomponent or components shall be used for these tests.

25、 The fixture must carry the test loads, througha universal type joint, to the seat component or components near the points of attachment to the body,but must not be attached in a manner which would reinforce the sample under tests.b. The test sample is to be attached to the appropriate body structur

26、al members in the designed manner.If other seat components or trim items contribute to the restraint of the sample, these items must alsobe installed in their design position.c. The test load is to be applied in a horizontal forward and rearward direction through the c.g. of theapplicable fully trim

27、med component or components (see Figure 2). For folding seatbacks thehorizontal load shall be applied in the direction of fold (see Figure 3).SAE J879b Revised JUL68-4-FIGURE 2SIMULATED INERTIA LOADINGFIGURE 3SIMULATED INERTIA LOADINGSAE J879b Revised JUL68-5-5.2 Simulated Occupant Loadinga. Adapt t

28、he test fixture to the subject seat cushion and back frame assembly (trimmed or untrimmed)with attachments.b. The length of the lever arm, D, is the distance from the seat back frame upper crossbar (or equivalentlocation) to the seat “H“ point measured on a line parallel to the plane of the seat bac

29、k frame.c. The load is applied as shown in Figure 4. FIGURE 4SIMULATED OCCUPANT LOADING5.3 Simulated Occupant Loading of Head Restrainta. A load carrying fixture that will distribute the test loads into the applicable component or componentsshall be used for these tests. The load shall be applied no

30、rmal to the seat back through the centerlineand at the top of the primary structure of the head restraint. Vertically adjustable head restraints shallbe loaded with the head restraint in the fully extended position. All head restraints on a seat back shallbe loaded simultaneously.b. The test sample

31、is to be attached to the seat back or other supporting structure in the designedmanner. If body structural members, seat components, or trim items contribute to the support of thehead restraint, these items shall be installed in their design position.c. The load is applied as shown in Figure 5.6. Ca

32、lculated Inertia Loading Analysis6.1 PurposeTo determine the ability of the vehicle restraining device for seat backs and folding seats to resistinertia loading unlatching by means of a mathematical analysis of the component parts in their vehicle seatposition.SAE J879b Revised JUL68-6-FIGURE 5SIMUL

33、ATED OCCUPANT LOADING OF HEAD RESTRAINT.NOTE: SEAT BACK MAY BE MOUNTED IN A FIXTURE WHICHSIMULATES CUSHION ATTACHMENT FOR THIS TEST6.2 ProcedureDetermine the following from a restraining device layout, detail drawings, and/or actual parts:a. Minimum spring forces.b. Center of gravity and relative po

34、sitions of the basic moveable components.c. Gravitation effect on component movements.d. The direction of force transmission through the restraining device assembly due to a forward inertiaload with respect to the seat.NOTEFrictional effects, work to be done, and gravitational effect on component mo

35、vements if it tends toresist unlatching need not be considered in the calculations since they tend to resist the restrainingdevice disengagement and, therefore, provide an additional margin of safety.e. Calculate the tendency of the restraining device to resist unlatching as shown by the example in

36、Figure6.SAE J879b Revised JUL68-7-FIGURE 6SEAT BACK LOCKING DEVICE INERTIAL LOAD CALCULATIONPREPARED BY THE SAE BODY ENGINEERING AND AUTOMOTIVE SAFETY COMMITTEESAE J879b Revised JUL68RationaleNot applicable.Relationship of SAE Standard to ISO StandardNot applicable.ApplicationThis SAE Recommended Pr

37、actice establishes uniform test procedures and certain minimumperformance requirements for motor vehicle seats and seat adjusters. It is limited to tests that can beconducted on uniform test fixtures and equipment available in commercial laboratory test facilities. Thispractice includes a minimum re

38、quirement for horizontal forward loads encountered in vehicle forwardimpacts, and horizontal loads obtained by impacting the vehicle from the rear. The requirements andtest procedures in this recommended practice reflect current technology and industry experience. It isintended to subject this recom

39、mended practice to a continuing review and revision as technologyadvances and experience is expanded.Reference SectionSAE J787Motor Vehicle Seat Belt AnchorageSAE J826Devices for Use in Defining and Measuring Vehicle Seating AccommodationDeveloped by the SAE Body Engineering and Automotive Safety Committee