GB/T 3478 consists of the following nine parts under the general title Straight cylindrical involute splines - Metric module, side fit:
——Part 1: Generalities;
——Part 2: 30° pressure angle dimensions tables;
——Part 3: 37.5° pressure angle dimensions tables;
——Part 4: 45° pressure angle dimensions tables;
——Part 5: Inspection;
——Part 6: 30° pressure angle M and W values;
——Part 7: 37.5° pressure angle M and W values;
——Part 8: 45° pressure angle M and W values;
——Part 9: Measuring pin.
This part is Part 5 of GB/T 3478.
1 Scope
This part of GB/T 3478 specifies the inspection method for straight cylindrical involute splines.
This part is applicable to the inspection of splines manufactured in accordance with GB/T 3478.1, and can also be taken as a reference for inspection with gauges for straight cylindrical involute splines.
2 Normative references
The following standards contain provisions which, through reference in this part of GB/T 3478, constitute provisions of this standard. For dated references, subsequent amendments to (excluding corrections to), 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 edition of the normative documents indicated below. For undated references, the latest edition of the normative document applies.
GB/T 1957 Tolerances and general features for plain limit gauges
GB/T 3478.1 Straight cylindrical involute splines - Metric module, side fit - Part 1: Generalities (GB/T 3478.1-2008, ISO 4156-1:2005, MOD)
GB/T 3478.6 Straight cylindrical involute splines - Metric module, side fit - Part 6: 30° pressure angle M and W values
GB/T 3478.7 Straight cylindrical involute splines - Metric module, side fit - Part 7: 37.5° pressure angle M and W values
GB/T 3478.8 Straight cylindrical involute splines - Metric module, side fit - Part 8: 45° pressure angle M and W values
GB/T 3478.9 Straight cylindrical involute splines - Metric module, side fit - Part 9: Measuring pin
GB/T 13924 Inspection code for accuracy of involute cylindrical gears
3 Standard temperature
The standard temperature for measurement is 20℃.
4 Inspection of splines’ major and minor diameters
4.1 The limiting dimensions of the minor diameter of internal spline Dii may be inspected with GO gauge and NO GO gauge of plain plug gauge, or be measured by other means.
4.2 The limiting dimensions of the major diameter of external spline Dee may be inspected with GO gauge and NO GO gauge of plain plug gauge, or be measured by other means.
4.3 The plain plug gauge and plain ring gauge used shall meet the requirements of GB/T 1957.
4.4 The major diameter of internal spline Dei, the minor diameter of external spline Die and the minimum curvature radius of the tooth root arc can be guaranteed by the technology, and shall be inspected, where necessary.
5 Inspection of space width of internal spline, tooth thickness of external spline, involute end circle diameter and involute start circle diameter
GB/T 3478.1 species four inspection methods in total, namely, three comprehensive inspection methods and one single item inspection method to inspect the four limiting dimensions of space width and tooth thickness (see Figure 1), as well as the minimum involute end circle diameter DFi min and the maximum Involute start circle diameter DFe max.
See Annex A for the involute spline gauges used for inspecting the space width and tooth thickness.
