This part of GB/T 3478 specifies the series of modules, basic tooth profiles, tolerances and side-fit classification for straight cylindrical involute splines.
This part is applicable to side-fitting straight cylindrical involute splines of standard pressure angles of 30° and 37.5 ° (modules from 0.5 mm ~ 10 mm), 45° (modules from 0.25 mm ~ 2.5 mm).
Note: for computer management, 37°30″ is expressed as 37.5°.
2 Normative References
The following documents contain provisions which, through reference in this part of GB/T 3478, constitute provisions of this Part. For dated reference, subsequent amendments to (excluding any corrigendum), or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For any undated references, the latest edition of the document referred to applies.
GB/T 1800.1 Geometrical Product Specifications (GPS) - Limits and Fits - Part 1: Bases of Tolerances, Deviations and Fits
GB/T 3478.5 Straight Cylindrical Involute Spline - Metric Module, Side Fit - Part 5: Inspection (GB/T 3478.5-2008, ISO 4156-3:2005, (Straight Cylindrical Involute Splines-Metric Module, Side Fit-Part 3: Inspection), MOD)
3 Terms and Definitions
See Table 1 and Figure 1 for the terms and definitions applied in this part (30° pressure angle flat root, hereinafter referred to as "30° flat root "; 30° pressure angle fillet root as 30° fillet root; 37.5 ° pressure angle fillet root as 37.5 ° fillet root; 45° pressure angle fillet root as 45°fillet root).
For the purpose of this part, the following terms and definitions apply.
Table 1 Terms, Symbols and Definitions
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4 Basic Parameters
4.1 See Table 2 for basic parameters.
4.2 The standard pressure angle αD is the tooth profile angle of basic tooth form.
4.3 Module m is classified into two series, 15 types; series 1 is preferred.
