ISO 1328-2:2020

SLOVENSKI STANDARD
01-marec-2023
Nadomešča:
SIST ISO 1328-2:1998
Cilindrični zobniki - Sistem klasifikacije bočnih toleranc po ISO - 2. del: Definicije
in dovoljene vrednosti radialnih kompozitnih odstopanj dvojnega boka
Cylindrical gears - ISO system of flank tolerance classification - Part 2: Definitions and
allowable values of double flank radial composite deviations
Engrenages cylindriques - Système ISO de classification des tolérances sur flancs -
Partie 2: Définitions et valeurs admissibles des écarts sur composés radiaux sur 2 flancs
Ta slovenski standard je istoveten z: ISO 1328-2:2020
ICS:
21.200 Gonila Gears
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 1328-2
Second edition
2020-02
Cylindrical gears — ISO system of
flank tolerance classification —
Part 2:
Definitions and allowable values
of double flank radial composite
deviations
Engrenages cylindriques — Système ISO de classification des
tolérances sur flancs —
Partie 2: Définitions et valeurs admissibles des écarts composés radiaux
Reference number
©
ISO 2020
© ISO 2020
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ii © ISO 2020 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols . 1
3.1 Terms and definitions . 1
3.2 Symbols . 3
4 Application of the ISO double flank radial composite tolerance classification system .3
4.1 General . 3
4.2 Gear tooth tolerance class . 4
4.3 Specification of datum surfaces . 4
4.4 Application of the ISO flank classification standard . 5
4.4.1 Measurement equipment and master gears . 5
4.4.2 Equipment verification and uncertainty . 5
4.4.3 Filtering and data density . 5
4.5 Acceptance criteria . 5
4.6 Correlation of double flank radial composite and element deviations . 5
4.7 Designation of the double flank radial composite tolerance class or tolerances. 6
5 Tolerance values . 6
5.1 General . 6
5.2 Use of formulae . 6
5.2.1 Number of teeth used to calculate tolerances . 6
5.2.2 Rounding rules . 6
5.3 Tooth-to-tooth radial composite tolerance, f . 7
idT
5.4 Total radial composite tolerance, F . 7
idT
5.4.1 Total radial composite tolerance for cylindrical gears . 7
5.4.2 Total radial composite tolerance for sector gears . 7
Annex A (informative) Graph of tolerance values for class R34, R44, and R50 for spur gears
with module = 1,0 mm . 8
Annex B (informative) Double flank radial composite deviation over segments of k teeth .10
Annex C (informative) Reasons for changing double flank composite tolerances .12
Annex D (informative) Conversion from another double flank composite tolerance specification 13
Annex E (informative) Calculation examples .14
Bibliography .22
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
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expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 60, Gears.
This second edition cancels and replaces the first edition (ISO 1328-2:1997), which has been technically
revised. The main changes compared to the previous edition are as follows:
— the document title of this part has been revised to correspond to that of part 1 and better reflect the
contents of this part;
— the scope of applicability has been expanded to include sector gears;
— revisions have been made to the formulae which define the double flank radial composite tolerances,
and the range of classification numbers has been changed to clarify the independence of this
classification system from that given in part 1;
— the change in tolerance value between consecutive tolerance classes has been reduced, so two steps
in the new system results in the same change as one step of the old system, but approximately the
same global range of tolerance values is maintained with additional steps;
— annexes have been added to describe complementary information and examples;
— evaluation of runout, previously handled in this document, has been moved to ISO 1328-1:2013;
— advice on appropriate inspection methods has been removed; the information can be found in
ISO/TR 10064-2.
A list of all parts in the ISO 1328 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved

INTERNATIONAL STANDARD ISO 1328-2:2020(E)
Cylindrical gears — ISO system of flank tolerance
classification —
Part 2:
Definitions and allowable values of double flank radial
composite deviations
1 Scope
This document establishes a gear tooth classification system relevant to double flank radial composite
deviations of individual cylindrical involute gears and sector gears. It specifies the appropriate
definitions of gear tooth deviations, the structure of the gear tooth flank classification system, and the
allowable values of the gear tooth deviations. It provides formulae to calculate tolerances for individual
product gears when mated in double flank contact with a master gear. Tolerance tables are not included.
This document is applicable to gears with three or more teeth that have reference diameters of up
to 600 mm.
This document does not provide guidance on gear design nor does it recommend tolerances.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 701, International gear notation — Symbols for geometrical data
ISO 1122-1, Vocabulary of gear terms — Part 1: Definitions related to geometry
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 701 and ISO 1122-1 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1.1
double flank test
test where a master gear (3.1.4) and a product gear (3.1.5) are rotated in tight mesh contact, i.e. held
together by a spring load so there is no backlash, while measuring the changes in center distance
3.1.2
elemental deviation
deviation, such as profile and helix deviation on individual teeth or pitch deviation between teeth,
generally using a single point of contact probe
3.1.3
elemental method
method to measure elemental deviations (3.1.2)
Note 1 to entry: ISO 1328-1 describes elemental methods and deviations.
3.1.4
master gear
gear with the required precision that is designed to measure double flank radial composite deviation in
a double flank contact test with a product gear (3.1.5)
3.1.5
product gear
gear that is being measured or evaluated
3.1.6
tooth-to-tooth radial composite deviation
f
id
value of the greatest change in center distance within any one pitch, found after evaluating all the teeth
of a product gear (3.1.5) in a double flank test (3.1.1) with a master gear (3.1.4)
Note 1 to entry: See Figure 1.
Key
1 single tooth pitch
n tooth number
a tight mesh center distance
c
Figure 1 — Tooth-to-tooth radial composite deviation
3.1.7
tooth-to-tooth radial composite tolerance
f
idT
maximum tooth-to-tooth radial composite deviation (3.1.6) allowable by specification
3.1.8
total radial composite deviation
F
id
difference between the maximum and minimum values of center distance fo
...