SAE J2370-2001 Geometric Dimensions and Tolerancing for Curved Hose.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 therefr
2、om, 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. TO PLACE A DOCUMENT ORDER: +1 (724) 776-4970 FAX: +1 (724) 776-0790 SAE WEB ADDRESS h
3、ttp:/www.sae.org Copyright 2001 Society of Automotive Engineers, Inc. All rights reserved.Printed in U.S.A. SURFACE VEHICLE 400 Commonwealth Drive, Warrendale, PA 15096-0001 RECOMMENDED PRACTICE Submitted for recognition as an American National Standard J2370 ISSUED MAY2001 Issued2001-05 Geometric D
4、imensions and Tolerancing for Curved Hose ForewordThe design engineer assigning tolerances for size, length and geometry must consider function, mating relationships, virtual condition, datums, and economy. Owing to the construction of rubber hoses (synthetic elastomeric material) and being a “non-r
5、igid” product that can be deformed by shipping conditions, measurement forces, and in many cases its own weight, care must be taken in applying GD no tolerances for true position outer boundary (see Section 3) will be included with this document. The true position tolerance for the outer boundary sh
6、all be determined by customer and supplier and should be based on feasibility analysis conducted prior to final release of design record. 1.ScopeTo provide the curved hose industry and their customers with a recommended practice for applying GD or if datum targets are designated, positioned against
7、datum target features simulators. Other than locating on the specified datum features and other datum target features (support points) as designated on the drawing, the hose will be considered to be in its “free-state.” 6.2Method 2 6.2.1The part may also be described by establishing a datum referenc
8、e frame at one end of the hose and providing additional support or restraint as necessary (see Figures 3 and 4). 6.2.2PRIMARY DATUMThe primary datum feature is the internal diameter (I.D.) of one of the hose ends. The datum is the axis of the internal diameter over a prescribed length. The axis is t
9、heoretically the intersection of two mutually perpendicular planes, which are the origin of measurement in two (of three) directions. 6.2.3SECONDARY DATUMThe secondary datum feature is the end surface of the hose. The datum is a plane which is perpendicular to the primary datum axis (and planes) and
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