Rolling bearings—Needle roller bearings with drawn cup and without inner ring—Boundary dimensions,geometrical product specifications(GPS)and tolerance values
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
滚动轴承 无内圈冲压外圈滚针轴承 外形尺寸、产品几何技术规范(GPS)和公差值 Rolling bearings—Needle roller bearings with drawn cup and without inner ring— Boundary dimensions，geometrical product specifications( GPS) and tolerance values (ISO 3245：2015，IDT)
注：下边加横线的值为优选尺寸。 a C1和C2分别为C1s和C2s的上限值。 b 倒角尺寸r为rs的下限值。 表3 开口型和封口型无内圈冲压外圈滚针轴承外形尺寸——直径系列2D 单位为毫米 Fw D C C1a C2a rb 尺寸系列 22D 32D 42D 52D 62D 72D 82D
a C1和C2分别为C1s和C2s的上限值。 b 倒角尺寸r为rs的下限值。 6 公差 6.1 总则 在表4～表6中，符号U和L规定如下： U——上极限偏差； L——下极限偏差。 6.2 内径公差 根据ISO 10579中的定义，冲压外圈滚针轴承为非刚性零件，在检验滚针总体内径时需将冲压外圈压入一环规中。 ISO 10579中规定的自由状态条件对尺寸C、C1、C2和r的公差是有效的。 ΔFws的公差tΔFws见表4和表5。 表4 ΔFws的公差——直径系列1D 单位为毫米 Fw Da 约束直径b D1c tΔFws U L
a 未规定冲压外圈外径D的偏差。轴承制造商应保证满足功能要求的配合。 b 如果实际约束直径偏离其规定值，应修正tΔFws以补偿此偏差。 表5 ΔFws的公差——直径系列2D 单位为毫米 Fw Da 约束直径b D1c tΔFws U L
说明： 1——轴的公称直径d1(＝Fw)； 2——轴承座孔的公称直径D1(＝D)； 3——钢或铸铁轴承座的公差等级为N6，轻金属轴承座的公差等级为R6(见注2)； 4——圆柱度按ISO 1101[3]； 5——或 ； 6——或 。 注1：轴承座的建议值适用于与轴承装配的表面。轴滚道的技术要求适用于轴表面的功能性部分。 注2：其他材料轴承座结构的具体建议可向轴承制造商咨询。 图A.1 轴和轴承座结构 参考文献 [1] ISO 286-1 Geometrical product specifications (GPS)—ISO code system for tolerances on linear sizes—Part 1：Basis of tolerances，deviations and fits [2] ISO 286-2 Geometrical product specifications (GPS)—ISO code system for tolerances on linear sizes—Part 2：Tables of standard tolerance classes and limit deviations for holes and shafts [3] ISO 1101 Geometrical product specifications (GPS)—Geometrical tolerancing—Tolerances of form，orientation，location and run-out [4] ISO 1132-2 Rolling bearings—Tolerances—Part 2：Measuring and gauging principles and methods [5] ISO 2639：2002 Steels—Determination and verification of the depth of carburized and hardened cases [6] ISO 8015 Geometrical product specifications (GPS)—Fundamentals—Concepts，principles and rules [7] ISO 14253-1 Geometrical product specifications (GPS)—Inspection by measurement of work pieces and measuring equipment—Part 1：Decision rules for proving conformity or nonconformity with specifications [8] ISO 14253-2 Geometrical product specifications (GPS)—Inspection by measurement of work pieces and measuring equipment—Part 2：Guidance for the estimation of uncertainty in GPS measurement，in calibration of measuring equipment and in product verification [9] ISO 14638 Geometrical product specification (GPS)—Matrix model
