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GB/T 2889.4-2011: Plain bearings -- Terms, definitions, classification and symbols -- Part 4: Basic symbols
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Plain bearings -- Terms, definitions, classification and symbols -- Part 4: Basic symbols
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GB/T 2889.4-2011
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Basic data | Standard ID | GB/T 2889.4-2011 (GB/T2889.4-2011) | | Description (Translated English) | Plain bearings -- Terms, definitions, classification and symbols -- Part 4: Basic symbols | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J12 | | Classification of International Standard | 21.100.10 | | Word Count Estimation | 12,113 | | Date of Issue | 2011-12-30 | | Date of Implementation | 2012-10-01 | | Adopted Standard | ISO 4378-4-2009, IDT | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 23 of 2011 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the sliding bearing basic symbols used in the field, but also defines a cook superscript or subscript diacritics. Sliding bearing system of symbols by Latin, Greek, Arabic numerals and other symbols (such as: point, comma, dash or an asterisk) and the like. Only the most simple basic notation symbols and complex symbols are basic symbols plus subscript and superscript (diacritics). From an international point of view of applicability, and the additional symbols of all the basic symbols are derived from the English, and as far as possible using the latest technology used in the literature named. This section applies to all forms seeks sliding bearings. Classification symbols in this section is based on computing, technology, geometry and plain bearings best quality guarantee symbols used to divide. Some structures have a fixed amount of value, where possible circumstances, in uppercase letters. In special applications, the provisions of the basic symbols used alone or, when necessary, with the appropriate diacritics used in combination in order to avoid confusion. Through the appropriate symbol to avoid multiple additional name. | GB/T 2889.4-2011: Plain bearings -- Terms, definitions, classification and symbols -- Part 4: Basic symbols
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Plain bearings Terms, definitions, classification and symbols Part 4. Basic symbols
ICS 21.100.10
J12
National Standards of People's Republic of China
Plain bearings - Terms, definitions and classification
Part 4. Basic symbols
Plainbearings-Terms, definitions, classificationandsymbols-
Part 4. Basicsymbols
(ISO 4378-4.2009, IDT)
Issued on. 2011-12-30
2012-10-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 2889 "Plain bearings - Terms, definitions and classification", known and plans to release two parts.
--- Part 1. Design, bearing materials and their properties;
--- Part 4. Basic symbols.
This part of GB /Part 4 T 2889's.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This section uses the translation method identical with the international standard ISO 4378-4.2009 "Plain bearings - Terms, definitions, classification and symbols - Part 4
Part I. basic symbols. "
And ISO 4378-4.2009 as compared to this section made the following editorial changes.
--- Remove the International Standards Normative documents listed in the inventory but not cited in the standard ISO 4378-5.
This part is proposed by China Machinery Industry Federation.
Bearing this in part by the National Standardization Technical Committee (SAC/TC236) centralized.
This section is responsible for drafting unit. Productivity Promotion Center in the machine.
Participated in the drafting of this section. Shanghai Jiaotong University, Xi'an Jiaotong University, Jiashan Feng Bearing Co., Ltd. into three complex.
Introduction
Since the sliding bearing areas of memory in a large number of complex symbols named, so the standard or technical literature symbol error prone. This
Uncertainty caused by species continues to increase supplementary symbol named, which further exacerbated the possibility of misunderstanding.
GB/T 2889 This section is intended to set forth a unified system of basic symbols.
Plain bearings - Terms, definitions and classification
Part 4. Basic symbols
1 Scope
This section GB/T 2889 defines the basic symbols sliding bearings used in the field, but also defines the subject attached with superscript or cook
Plus sign.
Bearing symbolism by the Latin alphabet, the Greek alphabet, Arabic numerals and other symbols (such as. point, comma, dash or asterisk)
And the like. The easiest sign only the basic symbols, complex symbols are basic symbols plus subscript and superscript (diacritics).
From the viewpoint of the international applicability of all the basic symbols and additional symbols are derived from English, and as far as possible using the latest technical literature
Name used. This section seeks to apply to all forms of sliding bearings.
This section is calculated classification symbol, symbols technology, geometry and plain bearings used for quality assurance division.
Some structures have a fixed amount of value, where possible, the uppercase letters. The basic character in special applications, the provisions of
No. Only used alone or when necessary with a suitable combination of additional symbols to avoid confusion. By appropriate additional character
Number to avoid multiple names.
2 basic symbols
The basic symbol is represented by an uppercase or lowercase letters, in exceptional cases, by two uppercase or lowercase letters.
Variable application italics, abbreviations, use the traditional characters represented.
Example. N = rotational frequency; VG = viscosity grade.
3 additional symbol
3.1 subscript
Subscript by three letters, numbers, or a combination of letters and numbers - the composition. Typically, the index of the first letter of the corresponding English word
The first letter, followed by letters of the English words behind the letters. Subscript expression should be simple as possible.
If the symbol is a variable index, letters in italics, if the acronym is represented by a positive body.
Example. c = round; cr = critical; cal = calculation.
If the index consists of two parts, the middle should be separated by commas with no spaces. Cases, the minimum allowable transition to a mixed lubrication lubricating film thickness
It is expressed as hlim, tr. If you think this represents subscript too complex to be just a letter or a number to represent instead of, for example. with
h1 instead of hlim, tr, provided that the letters or numbers have not been used as a subscript.
3.2 superscript
Superscript by points, lines, commas, asterisks and other symbols. Each basic symbols allows a maximum of two superscript symbols. Example. u- *.
4 basic symbol, subscript, the subject of the application and the difference
And the rotation angle counter-clockwise direction is defined as positive, the definition also applies to the rotational speed, the peripheral speed and the angular velocity.
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