Detail of GB/T 12764-2019

Introduction of GB/T 12764-2019

This standard is drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 12764-2009 Rolling Bearings — Needle Roller Bearings, Drawn Cup without Inner Ring — Boundary Dimensions and Tolerance in whole, and the following technical deviations have been made with respect to GB/T 12764-2009: — addition of the term of “constraint diameter” (see Clause 3); — application of geometrical product specifications, modification of some symbols and their meanings, modification of drawing notations (see Clause 4 hereof; Clause 4 of Edition 2009, Figure 1); — addition of the description of the upper and lower limits of C1s, C2s, rs (see 6.3.2 and 6.3.3); — deletion of the measurement of the smallest single bore diameter of needle roller complement (see Clause 7 of Edition 2009). This standard is identical with International Standard ISO 3245:2015 Rolling Bearings — Needle Roller Bearings with Drawn Cup and Without Inner Ring — Boundary Dimensions, Geometrical Product Specifications (GPS) and Tolerance Values. The Chinese documents consistent and corresponding with the normative international documents in this standard are as follows: — GB/T 4199-2003 Rolling Bearing — Tolerances — Definitions (ISO 1132-1:2000, MOD) — GB/T 6930-2002 Rolling Bearings — Vocabulary (ISO 5593:1997, IDT) — GB/T 7811-2015 Rolling Bearings — Vocabulary (ISO 15241:2012, IDT) — GB/T 16892-1997 Geometrical Tolerancing Indication of Non-rigid Parts (eqv ISO 10579:1993) This standard was proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee 98 on Rolling Bearings of Standardization Administration of China (SAT/TC 98). The previous editions of this standard are as follows: — GB/T 12764-1985, GB/T 12764-2009.   Introduction This standard is a machine element geometry standard as defined in the geometrical product specification system (GPS system) as presented in matrix model of ISO 14638 [9]. The fundamental rules of ISO/GPS given in ISO 8015 [6] apply to this standard and the default decision rules given in ISO 14253-1 [7] apply to specifications made in accordance with this standard, unless otherwise indicated. The connection between functional requirements, measuring technique and measuring uncertainty is always intended to be considered. The traditionally used measuring technique is described in ISO 1132-2 [4]. For measurement uncertainty, it is intended that ISO 14253-2 [8] be considered. Rolling Bearings — Needle Roller Bearings with Drawn Cup and without Inner Ring — Boundary Dimensions, Geometrical Product Specifications (GPS) and Tolerance Values 1 Scope This standard specifies the boundary dimensions and preferred dimensions to be used for drawn cup needle roller bearings without inner ring as well as the minimum chamfer dimension limits. Also specified are the closed end thickness dimensions for bearings with one closed end. In addition, dimensional tolerances for the needle roller complement bore diameter and tolerances for the drawn cup width are specified. Informative values for the tolerances for shaft raceway and housing bore are given in Annex A. 2 Normative References The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1132-1 Rolling Bearings — Tolerances — Part 1: Terms and Definitions ISO 5593 Rolling Bearings — Vocabulary ISO 10579 Geometrical Product Specifications (GPS) — Dimensioning and Tolerancing — Non-rigid Parts ISO 14405-1 Geometrical Product Specifications (GPS) — Dimensional Tolerancing — Part 1: Linear Sizes ISO 15241 Rolling Bearings — Symbols for Physical Quantities ISO/TS 17863 Geometrical Product Specification (GPS) — Geometrical Tolerancing of Moveable Assemblies 3 Terms and Definitions For the purposes of this document, the terms and definitions given in ISO 1132-1, ISO 5593, ISO 14405-1 and the following apply.   3.1 constraint diameter D1c diameter of the feature used in constraint condition to establish ΔFws characteristics Note: It corresponds to the diameter of the ring gauge in ISO 1132-2 [4]. 4 Symbols For the purposes of this document, the symbols given in ISO 15241 and the following apply. Descriptions for symbols are in accordance to GPS terminology. The dimensional specifications are described in Table 1 and Figure 1. Figure 1 presents the dimensioning associated to a needle roller bearing, using the symbols introduced in Table 1. Tolerance value associated to a characteristic is symbolized by t followed by the symbol of characteristic, for example, tΔCs. In this standard, the ISO default specification operator for size is according to ISO 14405-1; i.e. the two-point size is valid.

Contents of GB/T 12764-2019

Foreword II Introduction IV 1 Scope 2 Normative References 3 Terms and Definitions 4 Symbols 5 Boundary Dimension 6 Tolerance Annex A (Informative) Tolerances for Shaft Raceway and Housing Bore Bibliography