This standard specifies measuring method of basic dimension of motor vehicles.
This standard is applicable to saloon cars, passenger cars and trucks, and other vehicles may refer to.
2 Normative References
GB 3730.2 "Motor Vehicles and Towed Vehicles-Masses of Vehicles-Terms and Definitions"
GB 3730.3 "Motor Vehicles and Towed Vehicles-Dimensions of Vehicles-Terms and Definitions"
GB 8170 "Rules for Rounding off of Numberical Values"
JB 3983 "Method for Measuring Reference Volume for Saloon Car Luggage Carrier"
JB 4100 "Saloon Car Carriage-Internal Dimension-Measuring Method"
3 Terms
3.1 Y-base plane
Longitudinal symmetrical plane of a vehicle, in accordance with the requirements of Chapter 2 in GB 3730.3.
3.2 X-base plane
Vertical plane vertical to Y-base plane, in accordance with the requirements of the manufacturer.
3.3 Z-base plane
Horizontal plane vertical to Y and X-base planes, in accordance with the requirements of the manufactory.
3.4 Y plane
Plane parallel to Y-base plane.
3.5 X plane
Plane parallel to X-base plane.
3.6 Z plane
Plane parallel to Z-base plane.
3.7 Base point, line and plane
Three or more actual points, lines or planes specified by the manufactory.
3.8 Point R
Design base point of the manufactory, which is used for determining the final normal position of each seat specified by the manufactory and is the coordinates simulating human body trunk and thigh hip joint center position and established relative to the designed motor vehicle structure, and is referred to as "seat base point".
3.9 Motor hood C point
Last point of motor hood plate in Y-base plane. If concealed wiper is equipped, C point is the intersecting point of the back point height of the motor hood plate to the windshield [see Figure A9 of Appendix A (Additional)].
3.10 Point D of back deck
Foremost point on luggage cabin cover or tail cover plate in Y-base plane. If the luggage cabin cover or tail cover plate extends to the rear window, Point D is the intersecting point of cover plate height to rear window glass or its decorating strip (see Figure A9).
4 Measuring Conditions
4.1 The measuring site shall be provided with support surface of horizontal and hard covering layer.
4.2 Steering wheels of motor vehicles shall be placed on the measuring site in straight ahead condition.
4.3 The tyre pressure of motor vehicles shall meet the design requirements.
4.4 Unless otherwise specified, the length shall be measured on the straight line parallel to the support plane and Y-base plane; the width shall be measured on the straight line parallel to X-base plane; and the height shall be measured on the straight line vertical to the support plane.
4.5 Motor vehicles, if equipped with movable spare parts, shall be measured according to the following specified state.
4.5.1 The container breast board shall be in off state, except when measuring the height QGB-H501 from container base plate to ground.
4.5.2 Car door, motor hood, luggage cabin cover and ventilation vent cover, etc. shall be in off state.
4.5.3 Radio antenna shall be in take-back state.
4.5.4 License plate is excluded, but license plate frame is included.
4.6 Measuring instrument and equipment
a. Height gauge: measuring range 0~1000mm and minimum scale 0.5mm;
b. Ground clearance meter: measuring range 0~500mm and minimum scale 0.5mm;
c. Angle ruler: measuring range 0°~180° and minimum scale 1°;
d. Steel tape: measuring range 0~20m and minimum scale 1mm;
e. Level gauge;
f. Three-dimensional H-point device.
Note: Three-dimensional coordinatograph may be available.
GB/T 12673-1990 The following standards are cited：
