This standard gives the geometrical codes used to mark gear parameters. It consists of two tables: - Main code, consisting of a single basic letter. - Subscript, used to define the main code. GB/T 2821-2003 Gear geometrical element code GB/T2821-2003 Standard download decompression password: www.bzxz.net

This standard adopts the [S01:1998 International Symbols for Gears] (English version). This standard refers to G128211332 Gear Elements. This standard has the following main differences from GB/T 2821:1992: It is no longer specifically listed or included in the appendix "Examples of Gear Geometric Elements" (Chapter 3 of the 12th chapter), but the code combination is carried out according to the code combination rules. In order to facilitate the use of the six standards, the following modifications are made: the name of the standard is changed from "this international standard" to "this standard", and the foreword and introduction with the national environmental standard are deleted: This standard is proposed by the China Machinery Industry Congress. The national standardization technical committee of this standard is responsible for the export of the standard: Zhengzhou Institute of Standardization. The main authors of this standard are: Zhang Yuan, Chen Yanmin, Wang Minlu, and the second edition of this standard is: GR/T 2821-1U81, GB/T 282_--19J21 Scope
GB/T2821—2003/ISO701:199E
Gear geometry code
This standard gives the geometric code used to mark the gear number. It consists of two tables: code, composed of a single basic letter (see Table 1), the subscript is used to define the main code (see Table 2, Table 3 and Table 1), 2 code
2, 1 geometric code combination rules
The main rules are as follows,
6) The code consists of a single basic letter (see Table 1), the subscript is used to define the main code (see Table 2, Table 3 and Table 1), 2 b) The main code consists of one or more subscripts, or a superscript. b) The main code consists of a single lowercase letter or a lowercase letter. The letters should be italicized Latin letters or italicized Greek letters. The subscript of the letter is an integer, a decimal or a Roman numeral printed in Roman typeface. A code can have only one numerical subscript. CF
All subscripts are dotted on the same line and are lower than the main code with a stroke or bar (with a bar above or below), except for the superscript of the serial number, which is preceded by a subscript, a leading superscript, a secondary subscript, and a secondary superscript. Avoid using the broken numbers.
2.2 Main geometric codes
Table 1 lists the most common codes.
2.3 Main subscripts
The same subscript can have different meanings, depending on the subscript definition. Table 2 gives the commonly used subscripts: Table 3 shows the subscripts with two or one subscript: Table 4 gives the numerical subscripts. The subscripts are used together with the main code as a code. 2.4 Order of subscripts
When using more than one subscript symbol, it is recommended to use Table 5. 3 Examples See Table 6 for examples, CB/I282/-2003/(SO701:1998) Table 1 Main geometrical codes Direct-acting diagram of gear ratios Step-by-step increase in gear ratios Tooth height (total tooth height, gear height) Total transmission ratio is the distance from the cylinder or ball to the bladder This distance, number of gears The diameter of the gear wheel Table 2 Main subscripts
Classification
Basic gear
Half-light
Effect ratio
External length
Meridian displacement coefficient
Center distance variation coefficient
Pressure hexagonbzxZ.net
Screw angle
Pregnancy angle
Blood cliff
Half angle
Tooth shadow of the push wheel
Curvature half grid
Axis intersection
Tooth thickness half angle
Source plane
Effective
Abstract coupling
Boil point
Real effect
Slowness
Table 3 Abbreviation subscript
The largest
Table 4 Chain subscript
External, internal
Subsequent library
Table 6 Code example
Step ratio
French number
Surface meshing
CB/T2821-—203/IS0 701:1998
The smallest
Standard gear control
Surface soul direction
Gear two-pointing diagram straight light
Big wheel section share
Other gears
0.1.3.3...
Big wheel Vieux
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