SAE-J4004-2008.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 entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising ther
2、efrom, 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
3、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
4、) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org J4004 AUG2008 SURFACE VEHICLE RECOMMENDED PRACTICE Issued2005-08 Revised 2008-08 Superseding J4004 AUG2005 Positioning the H-Point Design ToolSeating Reference Point and Seat Track Length RATIONALE The 2008 revision
5、 of this Recommended Practice aligns the document with current industry procedures while preserving the advantages of the new tools and methods described in SAE J4002 and SAE J4003. The new definitions and procedures allow manufacturers flexibility to change accelerator pedal shape and orientation w
6、ithout necessitating changes in the Seating Reference Point (SgRP) location and simplify the communication of pedal and package requirements between manufacturers and suppliers. A new Shoe Plane and Shoe Plane Angle (SPA) replace the Pedal Plane and Pedal Plane Angle defined in the previous revision
7、. The SPA equation is now cubic, based on an improved empirical fit to the kinematics of the SAE J4002 HPM-II and SAE J826 HPM geometry. The SPA equation is now also based on an ankle angle fixed at 87 degrees, which is a current industry practice and identical in intent to the SAE J1516 theta equat
8、ion. However, the new fit better characterizes the kinematics of the HPM and the H-point Design Tool (HPD). The new Ball of Foot Reference Point (BOFRP) replaces the Pedal Reference Point (PRP) in the previous version as the reference for the SgRP locator curve. The key difference is that the BOFRP
9、need not lie on the pedal surface, giving flexibility to change accelerator pedal shape and orientation without changing SgRP. The BOFRP is now 203 mm from the Accelerator Heel Point (AHP), consistent with SAE J826, SAE J1100:2008, and vehicle manufacturers around the world. The recommended SgRP Z l
10、ocation for seats with vertical adjustment was revised in response to some manufacturers increasing the range of seat height adjustments beyond the ranges used to develop this document. Depending on the amount of height adjustment provided, SgRP_Z will either be at mid-height of the H-point travel w
11、indow or lower, with a maximum height of 20 mm above the full-down H-point travel path. The HPD has also been revised to include some elements of the SAE J826 2-D H-point template, based on requests from manufacturers. A 2-D profile that includes a shoulder reference point has been added to the stan
12、dard form of the HPD CAD tool. This document may be used with the SAE J826 design tool, provided that the flat shoe bottom defined in SAE J826 (2008) is used. SAE J4004 Revised AUG2008 - 2 - FOREWORD This document describes how to position and posture the H-point design tool (HPD), and how to establ
13、ish the seating reference point (SgRP) and other key reference points that are used in the design and specification of both driver and passenger seat positions. Use of the HPD in conjunction with the H-point machine (HPM-II) for benchmarking vehicle occupant packages is described in SAE J4003. Predi
14、ction of where drivers select seat positions on the seat adjuster path is important for many aspects of vehicle design related to comfort and safety. Vehicle designers use driver seat position models to determine the length and location of adjustable seat tracks to insure that drivers of varying siz
15、e can comfortably reach and operate vehicle hand and foot controls. This document provides a new method for determining driver seat track length and for positioning the seat track in the vehicle package. It is based on studies and statistical models developed at the University of Michigan Transporta
16、tion Research Institute. The new method for positioning driver seat tracks in the vehicle is based on H30 and two new variables, L6 and the presence or absence of a clutch pedal. The seat track length is independent of vehicle seat or package variables. It is based on accommodating with high statist
17、ical confidence the range of statures represented by an equal number of U.S. male and female drivers. Background details of the new method are given in Appendix A. Historical information about the prior procedure is given in Appendix E. SAE J4004 will in the future fully replace SAE J1517:1990 for C
18、lass A vehicles. Until 2017 the ball-of-foot and accelerator heel point determined according to SAE J1517 may be used in lieu of the BOFRP cited in this document. However, SAE J4004 should be used to determine the seat track length and the accommodation levels for the U.S. driving population. -,-,-
19、SAE J4004 Revised AUG2008 - 3 - TABLE OF CONTENTS FOREWORD 2 1.SCOPE4 2.REFERENCES5 2.1Applicable Publications.5 2.1.1SAE Publications.5 2.2Related Publications .5 2.2.1SAE Publications.5 3.DEFINITIONS .6 3.1SAE J1100 Definitions 6 3.2SAE J4004 Definitions 7 3.2.1Driver Seat Position Accommodation .
20、7 3.2.2Driver Seat Position Accommodation Point7 4.DETERMINING THE DRIVER SEATING REFERENCE POINT AND POSITIONING THE HPD.7 4.1Overview of Design Procedures .7 4.2Driver Designated Seating Position Design Procedure9 4.2.1Determine the Initial Target Values.9 4.2.2Define Shoe Tool Location and Attitu
21、de .10 4.2.3Position the SgRP Curve and Design H-point Travel Path.13 4.2.4Determine SgRP, Measure H30, Verify W2013 4.2.5Optional SPA Recalculation14 4.2.6Position HPD Cushion and Back Pan.15 4.2.7Position HPD Shoe, Thigh, and Lower Legs 15 5.DRIVER SEAT TRACK ACCOMMODATION FOR A U.S. DRIVER POPULA
22、TION15 5.1Determine H-point Reference X Position15 5.2Determine Seat Track Length.16 5.3Position H-point Travel Path in Vehicle 16 5.3.1Add Driver Seat Position Accommodation Points (optional).16 5.3.2Angle Seat Track in Side View16 5.4Position Seat Track in Vehicle17 6.DESIGN PROCEDURES FOR 2ND OR
23、3RD ROW OUTBOARD SEATING POSITIONS.17 6.1Determine the Initial Target Values.18 6.2Establish Seat Positions .18 6.2.1Seat Position of Seat in Front.18 6.2.2Current Seat Position18 6.3Position HPD (Cushion and Back Pan Assemblies), Determine SgRP18 6.4Position Shoe Tool18 6.5Position Thigh and Lower
24、Leg 19 6.6Short-coupled Seating 19 6.7Decision Tree for Short- and Long-Couple Procedures .20 6.8Determine Dimensions22 7.NOTES22 7.1Marginal Indicia.22 APPENDIX A MODEL DESCRIPTION AND APPLICATIONS FOR OTHER DRIVER POPULATIONS23 A.1BACKGROUND 23 A.2MODEL DESCRIPTION23 A.3TOLERANCE25 A.4PROCEDURE.26
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