ISO 3548-3:2023 すべり軸受 — フランジ付きまたはフランジなしの薄肉半割軸受 — Part 3: 周長の決定 | ページ 2

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 patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents ).

Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and 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 123, Plain Bearings, Subcommittee SC 5, Quality analysis and assurance.

This second edition cancels and replaces the first edition (ISO 3548-3:2012), which has been technically revised.

The main changes are as follows:

• the errors in the calculation form in Annex A, Figure A.1 and Figure A.4 have been corrected;
• the errors in the calculation form in Annex B, Figure B.1 and Figure B.3 have been corrected;
• the errors in the formulae and in the calculated example in Clause E.3 have been corrected.

A list of all parts in the ISO 3548 series can be found on the ISO website.

1 Scope

This document specifies, according to ISO 12301, the checking of the peripheral length of thin-walled half bearings with or without flange, and describes the necessary checking methods and measuring equipment.

Thin-walled half bearings are flexible and, in the free condition, do not conform to a cylindrical profile. This is one reason the peripheral length of the half bearings can only be measured under a constraining load by use of specialized measuring equipment.

In addition, measuring equipment different from that illustrated in this document can be used, provided the measuring accuracy of the equipment is consistent with the specifications given in Clause 17.

This document does not include the measurement of the parting line taper.

This document applies to thin-walled half bearings, the specifications of which are given in ISO 3548-1.

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.

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

3.2

crush height

a

value by which a half bearing, fitted in a checking block of bore diameter, d_cb, under a pre-determined checking load, F, exceeds the defined peripheral length (3.1) of the checking block bore

Note 1 to entry: In practice, the datum serves as a basis for measuring a (see Figure 1).

Note 2 to entry: The symbol for crush height “(nip)” is no longer used and has been replaced with “a”.

Note 3 to entry:

Figure 1 — Crush height, a

Bibliography