SAE J2732_200806

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, many 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 independent 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 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 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. The Motor Vehicle Dimensions Recommended Practice (SAE J1100) has a limited number of seating measurements related to automotive 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 are 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 machine (HPM); however, the measured values may not be identical to values taken using HPM-II.