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This document provides technology, terminology, and procedural definitions common in Motor Vehicle seat design and testing.

Presents the seating accommodation model used to determine seat track length for accommodation in design.

This procedure provides a method of determining a benchmark SgRP position for adjustable Driver’s seats in Class A vehicles where the design intent information is not available. Class A vehicles include passenger cars, multipurpose passengervehicles, and vans with Seat Heights (H30) greater than 127 mm and less than 405 mm for the purposes of this document. Once the Driver’s Seat Benchmark SgRP is determined other seating positions can be readily benchmarked based on the standard procedures. This document references installation procedures using the SAE J826 H-point Machine. If desired the document can be adapted to use the HPM-II by substituting the appropriate SAE J4002 instatllation procedures. In that case, the use of the HPM-II should be clearly documented. Since the SgRP is the basis for many interior benchmark dimensions this information can be used to assess or compare vehicle interiors in a standard repeatable way based on the packaging limitations of the property.

This SAE Recommended Practice describes how to position and posture the H-point design tool (HPD) described in Appendix B, and how to establish the seating reference point (SgRP), design H-point travel path, and other key reference points that are used in the design and specification of both driver and passenger seat positions. This practice also provides a method for determining the length of the seat track for a driver seat that adjusts fore/aft. The seat track length is based on a desired level of driver accommodation, assuming a U.S. population containing an equal number of male and female drivers. The procedure can be used to establish driver seat track accommodation for new vehicle designs or to evaluate accommodation in existing vehicles. A general method for determining driver seat track length for any driver population (male and female stature distribution) at any selected accommodation percentile and gender mix is given in Appendix A.

This document describes the CAD model data available from SAE for the HPM-1 three-dimensional H-point machine. The elements of the CAD model include the outer surfaces of the cushion and back pans, datum points and lines, and calibration references. The intended purpose for this information is to provide a CAD reference for design and benchmarking as well as a calibration reference for the physical HPM-1 audits. The content and format of the data files that are available are also described. The actual CAD model files are included with this product and are provided in the following formats: CATIA v4 (without parametrics), CATIA v5 (without parametrics), IGES, and STEP.

This document describes the CAD model data available from SAE for the HPM-1 three-dimensional H-point machine. The elements of the CAD model include the outer surfaces of the cushion and back pans, datum points and lines, and calibration references. The intended purpose for this information is to provide a CAD reference for design and benchmarking as well as a calibration reference for the physical HPM-1 audits. The content and format of the data files that are available are also described.

These test procedures apply to complete seat systems (production seats or prototypes built at the intended manufacturing quality); however, the procedures can be modified for subsystem or component level testing.

This document describes the 3D computer-aided design (CAD) parts and file formats for the HPM-1 H-point machine available from SAE. The intended purpose for this information is to provide a master CAD reference for design and benchmarking.

Benchmarking is used to discover the design intent measurements for seating compartments in vehicles when these measurements are either unknown or are specified using differing measurement procedures. This document provides the specifications and procedures to establish consistent measurements for benchmarking vehicle seating positions using the H-Point Machine (HPM-II1) described in SAE J4002 and the H-Point Design tool (HPD) described in SAE J4004. The HPM-II is a physical tool used to establish key reference points and measurements in a vehicle (Figure 1). The HPD is a CAD tool that aids in the benchmarking process (see Appendix A and SAE J4004).

This document provides dimensional definitions that facilitate geometric quantification and evaluation of seats. Linear, radial, and angular surface dimensions included in this document are intended to approximate shape characteristics based on defined points of interest and not as a method needed to reproduce complex surface contours. In many cases, other points across the seat surface shape may exceed or not reach the boundary defined by these simple geometric definitions. Dimensions described in this document have been designed to be measured in a CAD environment; however, many dimensions require the HPD 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.

This document describes the 2-D computer-aided design (CAD) template for the HPM-1 H-point machine or HPD available from SAE. The elements of the HPD include the curve shapes, datum points and lines, and calibration references. The intended purpose for this information is to provide a master CAD reference for design and benchmarking. The content and format of the data files that are available are also described.

This document describes the 2-D computer-aided design (CAD) template for the HPM-1 H-point machine or HPD available from SAE. The elements of the HPD include the curve shapes, datum points and lines, and calibration references. The intended purpose for this information is to provide a master CAD reference for design and benchmarking. The content and format of the data files that are available are also described.

This recommended practice describes boundaries of hand control locations that can be reached by a percentage of different US driver populations in passenger cars, multi-purpose passenger vehicles, and light trucks (Class A vehicles). This practice is not applicable to heavy trucks (Class B vehicles).

This SAE Recommended Practice defines a set of measurements and standard procedures for motor vehicle dimensions. The dimensions are primarily intended to measure the design intent of a vehicle within a design environment (i.e., CAD). All dimensions in this practice can be measured this way. In addition, some dimensions can be taken in an actual vehicle. If measurements are taken on physical properties, some differences in values should be expected. Also, care should be taken to not confuse design intent measurements with those taken on a physical property. It is intended that the dimensions and procedures described in this practice be generic in their application to both the HPM, described in SAE J826, and the HPM-II, described in SAE J4002. In some circumstances, the figures may only reflect one or the other.