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 theref
2、rom, 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 2008 SAE International All rights reserved. No part of this publication ma
3、y 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)
4、Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgJ2732 JUN2008 SURFACEVEHICLESTANDARDIssued 2008-06Motor Vehicle Seat Dimensions RATIONALEThe Motor Vehicle Dimensions Recommended Practice (SAE J1100) has a limited number of seating measurements related to automotive
5、interior space. This document provides additional and more comprehensive dimensional measurements specifically for the design, evaluation and benchmarking of vehicle seats. Coordinate references are established along the cushion and seat back to better define seat characteristics. These dimensions a
6、re based primarily on the use of the SAE J4002 HPM-II that provides divot points, support points, a measure of lumbar support prominence, and many seat measures that can be taken independent of the seating package. Many of the definitions and measurements can be made with the SAE J826 H-point machin
7、e (HPM); however, the measured values may not be identical to values taken using HPM-II. TABLE OF CONTENTS INTRODUCTION. 21. SCOPE 22. NORMATIVE REFERENCES. 32.1 Applicable Publications . 32.1.1 SAE Publications. 33. DEFINITIONS . 44. CODE EXPLANATION . 74.1 Prefix Codes 74.2 Seat Position Codes . 8
8、4.3 Cross Sectional Code . 85. SEAT DIMENSIONS. 96. NOTES 186.1 Marginal Indicia. 18APPENDIX A (INFORMATIVE) RECOMMENDED SEAT CROSS SECTIONS. 19 BIBLIOGRAPHY . 22 SAE J2732 Issued JUN2008 - 2 -INTRODUCTIONThe tools and procedures for determining motor vehicle seat dimensions used in this document ar
9、e based on the SAE J4002 H-Point Machine (HPM-II). Many of the definitions and measurements can be made with the SAE J826 H-point machine (HPM), however the measured values may not be identical to values taken using HPM-II. Since the SAE J826 HPM does not have support or divot points, dimensions bas
10、ed on these points are difficult to measure in the field, but can readily be measured in CAD if desired. The LSP measure is not available with the SAE J826 HPM. Users shall document and maintain a record noting whenever the SAE J826 HPM is used in making the measurements cited in this document. H-po
11、int devices are used (1) during vehicle design and development to establish interior reference points and dimensions for occupant packaging, (2) to validate (audit) the location of these key reference points and dimensions on physical properties, and (3) to measure competitive vehicles for benchmark
12、ing. The procedures employed for each usage vary somewhat. SAE J4002 describes the use of the HPM-II in auditing vehicle seats and other interior compartment dimensions. SAE J4003 describes the use of the HPM-II in benchmarking. Audits are conducted by regulatory agencies and OEMs to assess how clos
13、ely the vehicle is manufactured to its design intent. Although serving different purposes, auditing and benchmarking procedures are very similar. The most significant difference between them is that audits use actual design intent values to set up the vehicle and position the seat, whereas benchmark
14、ing is used to discover the design intent values for competitor vehicles. 1. SCOPE This document provides dimension definitions that facilitate geometric quantification and evaluation of seats. Dimensions described in this document have been designed to be measured in a CAD environment; however, man
15、y dimensions require the HPM position and attitude. This can be obtained by physically establishing H-point using benchmark or auditing procedures OR by measuring the HPD within a CAD or modelling system. Refer to the appropriate document for these procedures. These dimensions are package independen
16、t in that they do not require use of the HPM-II supplemental thigh/leg/shoe. Three types of seat geometry reference points and measurements have been developed: Simple reference points and measurements not related to H-point. H-point dependent reference points and measurements that utilize the seat
17、characterization capabilities of the HPM to quantify seat measurements. Cross sectional seat trim outlines. For convenience and simplicity, many terms associated with H-point devices use human body parts in their name. However, they should not be construed as measures that indicate interaction with
18、any or all occupants concerning accommodation, human capabilities, or comfort. H-point devices do not represent the size or posture of any category of occupant.SAE J2732 Issued JUN2008 - 3 -2. NORMATIVE REFERENCES 2.1 Applicable Publications This document contains provisions which reference the foll
19、owing documents. The latest edition of the reference applies.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 J182 Motor Vehicle Fiducial Marks and Three-dimensional
20、Reference System SAE J826 Devices for Use in Defining and Measuring Vehicle Seating Accommodation SAE J1100 Motor Vehicle Dimensions SAE J4002 H-Point Machine (HPM-II) Specifications and Procedure for H-Point DeterminationAuditing Vehicle SeatsSAE J4003 H-Point Machine (HPM-II)Procedure for H-Point
21、DeterminationBenchmarking Vehicle Seats SAE J2732 Issued JUN2008 - 4 -3. DEFINITIONS For the purposes of this document, the following definitions apply. TABLE 1 - SEAT DEFINITIONS Term Definition Figure A-Surface Surface of a seat, or any of its components, that is closest to the occupant. For examp
22、le, the A-surface of the foam pad is the surface the occupant sits on. 3B-Surface Surface of a seat, or any of its components, that is furthest from the occupant (opposite the A-surface). For example, the B-surface of the foam pad is the surface in contact with the frame. 3Bench Seat Seat structure
23、designed to hold multiple occupants. N/A Biteline (seat bight) Area close to and including the intersection of the surface of the vehicle seat cushion and seat back. 2Bolster Raised contour at lateral edges of the seat cushion and seat back. 2 Bucket Seat Seat structure designed to hold a single occ
24、upant usually contoured to hold the occupant. N/ACenterline of Occupant (C/LO) Lateral (Y) centerline of an occupant in a given designated seating position. See SAE J1100. C/LO is repeated in this section for convenience. In the case of a CL trench or decorative raised regions, a lateral offset can
25、be used to approximate the centerline. 2Cross Car Lateral direction across vehicle (+Y, -Y). 1 Deflection (HPM) Distance between the free unloaded seat trim contour prior to HPM installation and the HPM surface, when loaded in the seat.4Head Restraint Protective device that limits the rearward displ
26、acement of a seated occupants head relative to the occupants torso. 2Insert Primary seating region between the bolsters on the seat cushion and seat back, usually defined with a seam or line in the trim A-Surface. 2Lumbar Region Area of the seat back that provides support for an occupants lower back
27、 can be adjustable or static. N/AProtruded (Extended) Refers to an adjustable mechanism when it is in its maximal or projected state. N/ARetracted Refers to an adjustable mechanism when it is in its minimal or withdrawn state. N/ASeat Adjuster Refers to mechanisms used to alter position, shape, or s
28、upport characteristics of the seat. N/ASeat Back Part of the seat that supports the occupants back. 2 Seat Cushion Part of the seat that supports the occupants buttocks and thighs. 2 Split Bench Seat Seat structure designed to hold multiple occupants that may be split for independent adjustment of t
29、wo or more occupant positions. N/ATie-down Depression or line in the A-surface of the trim cover created by the attachment of trim to seat components. N/ATrench Recess in the foam pad used to accommodate or attach seams in the trim cover. 2Trim Cover Material or attachment used to cover a seat. N/A
30、Trim Prominence Most prominent point on the undeflected profile of the seat trim defined by the tangent point of a line parallel to a reference line such as the Cushion or Torso (Back) Line. 3SAE J2732 Issued JUN2008 - 5 -FIGURE 1 - THREE DIMENSIONAL REFERENCE SYSTEM, SEE SAE J1100 FIGURE 2 - GENERA
31、L SEAT DEFINITIONS SAE J2732 Issued JUN2008 - 6 -FIGURE 3 - GENERAL SEAT DEFINITIONS (CROSS SECTION) TABLE 2 - HPM SPECIFIC DEFINITIONS Term Definition Figure Cushion Line Line from the H-point through the C1 divot point. See SAE J4002. 4 D-point Located on the bottom of the cushion pan, at the late
32、ral centerline, 25.5 mm (15 degrees) rearward of the H-point (when cushion angle equals 0). This point is identified by a divot point on the surface of the cushion pan. See SAE J1100. 4Divot Points Fourteen divot points are provided on the HPM. See SAE J4002. N/A Exit Point Point where the undeflect
33、ed trim separates from the manikins surface. Exit Points are determined using CAD. Lateral Exit Points are referenced to the HPM centerline. The measurement process assumes that HPM centerline is at the centerline of occupant (C/LO).4H-point Point at the pivot center of the back pan and cushion pan
34、assemblies, located on the lateral centerline of the H-point device (HPM or HPD). See SAE J4002. NOTE 1: When an H-point device is properly positioned within a vehicle either in CAD or in an actual physical property the location of the H-point relative to the vehicle is used as a vehicle reference p
35、oint. If the seat is moved, the location of the H-point within the vehicle is changed. Therefore, adjustable seats will have more than one H-point location, while fixed seats will have only one H-point location.NOTE 2: H-points are often referred to as hip points or hip pivot points. However, they d
36、o not accurately represent the location of the human hip joint.4Support Points There are nine support points: 5 located on the outer surface of the cushion pan and 4 on the back pan assembly. See SAE J4002. N/ATorso (Back) Line Line from the H-point through the sliding thoracic pivot (B1 divot point
37、). See SAE J4002. 4SAE J2732 Issued JUN2008 - 7 -FIGURE 4 - HPM SPECIFIC DEFINITIONS 4. CODE EXPLANATION Each dimension is assigned a code, which consists of an alpha prefix and a number. The letters denote the direction or type of measurement (e.g. W - Width, A - Angle). See Table 3. Numeric codes
38、relate to the type of vehicle dimension. Seat specific dimensions range between 10001999 (e.g. W1020). See Table 4.Users shall record pertinent design, setup, and measurement information, including settings for user adjustable features (e.g. lumbar support or thigh extender), CAD vs. field measureme
39、nt, and the HPM (SAE J4002 / SAE J826) used to set the reference position and attitude. 4.1 Prefix Codes TABLE 3 - PREFIXES Letter Meaning W Widths associated with seats (cross car distance). L Lengths associated with seats. H Heights associated with seats. A Angles associated with seats. R Radii as
40、sociated with seats. TABLE 4 - NUMERIC SCHEME Number Range Type of Dimension 199 Interior (General Seat Dimensions). 10001199 Seat Cushion Lateral Dimensions. 12001399 Seat Cushion Centerline Dimensions. 14001599 Seat Back Lateral Dimensions. 16001799 Seat Back Centerline Dimensions. 18001999 Seat H
41、ead Restraint Dimensions. SAE J2732 Issued JUN2008 - 8 -4.2 Seat Position Codes These dimensions can be applied to several designated seating positions. In order to indicate a specific seat position, the basic alphanumeric code remains the same, but an additional alphanumeric code is added (e.g., H3
42、0-1-L, H30- 2-R, H30-3-C). The number indicates the designated seating row. See Table 5. The letter indicates the seating position in that particular row. See Table 6 (e.g. W1015-1-L). TABLE 5 - SEATING ROW Row Number Designated Seating Row -1 Front Row Measurement. -2 Second Row Measurement. -3 Thi
43、rd Row Measurement. -4 Fourth Row Measurement. -5 Fifth Row Measurement. TABLE 6 - SEATING POSITION (SUFFIX) Letter Designated Seating Position -L Measurement taken for the left, outboard designated seating position. (-Y in vehicle coordinates)-R Measurement taken for the right, outboard designated
44、seating position. (+Y in vehicle coordinates) -C Measurement taken for the center designated seating position. -B Measurement taken for an entire bench seat (such as overall width). 4.3 Cross Sectional Code Selected dimensions are measured at a given distance from H-point along or normal to a given
45、reference line and are denoted with _X (where X equals the distance in mm from H-point) following the alphanumeric prefix (e.g. W1020_100). See Figure 5 and Appendix A. FIGURE 5 - CROSS SECTIONS AND CENTERLINE SECTIONS SAE J2732 Issued JUN2008 - 9 -5. SEAT DIMENSIONS The dimension definitions that f
46、ollow are shown with no suffix codes to indicate seat row or position. In practice the proper suffix codes should be added to identify seat aspects. Note also that certain seat and package dimensions are repeated in this Section for convenience.TABLE 7 - GENERAL SEAT DIMENSIONS Code Dimension Defini
47、tion Figure A27 Cushion Angle Angle of the Cushion Line from the horizontal with the HPM loaded in the seat with the seat at design attitude. See SAE J4002.6A42 Hip Angle Included angle between the Cushion Line and Torso (Back) Line with the seat at design attitude. See SAE J1100.6A40 Torso Angle An
48、gle measured between a vertical line through the H-point and the Torso (Back) Line. See SAE J1100. 6L81 Lumbar Support ProminenceLSP is a measure of the attitude (posture) of the H-point device. It is defined as 57 mm minus the distance from the lumbar-pelvic pivot point to the Torso (Back) line, me
49、asured normal to the Torso (Back) line. When LSP = 0, the posture is referred to as neutral. The suffix following L81 identifies the designated seating position. See SAE J1100.6FIGURE 6 - BASIC HPM DIMENSIONS SAE J2732 Issued JUN2008 - 10 -TABLE 8 - SEAT CUSHION LATERAL CROSS SECTION DIMENSIONS Code Dimension Definition Figure W1000_X Seat Cushion Width Width across the seat cushion soft trim surface within a cross se
