This standard specifies all the spline dimensions required for cylindrical spur involute splines with 45° standard pressure angle round tooth root (hereinafter referred to as 45° round tooth root). This standard applies to involute splines with a pressure angle of 45° and a module of .25 to 2.5 mm and tooth side fit as specified in GB/T 3478.1. GB/T 3478.4-1995 Dimensions of 45° pressure angle for cylindrical spur involute splines GB/T3478.4-1995 Standard download decompression password: www.bzxz.net

UDC 621. 886. 6
National Standard of the People's Republic of China
GB/T 3478.1~~3478.9--1995
Cylindrical spur involute splines
Straight cylindrical involute splines1995-07-12Published
State Administration of Technical Supervision
1996-05-01Implementation
National Standard of the People's Republic of China
Cylindrical spur involute splines
45° pressure angle dimension tables
Straight cylindrical involute splines-45° pressure angle dimensions tablesGB/T 3478.4—1995
Replaces GB3478.2—83
This standard adopts the second part "Dimensions" of ISO4156-1981 "Cylindrical spur involute splines-Metric module-Flank fit-General, dimensions and inspection"
1 Subject content and scope of application
This standard specifies all spline dimensions required for cylindrical spur involute splines with 45° standard pressure angle round tooth root (hereinafter referred to as 45° round tooth root).
This standard is applicable to involute splines with a pressure angle of 45°, a module of 0.25 to 2.5 mm and a flank fit as specified in GB/T3478.1.
This dimension table is compiled according to the calculation formula in Table 3 of GB/T3478.1 and the flank fit is H/h, and the basic inspection method is adopted. 2 Reference standards
GB/T3478.1 Cylindrical spur involute spline module basic tooth profile tolerance GB1800 General tolerance and fit standard tolerance and basic deviation 3 Dimension table
3.1 Dimension table of splines with 45° round tooth root, module of 0.25 to 2.5 mm, tolerance grades 4, 5, 6 and 7, see Tables 1 to 18. 3.2 Limit deviations of internal spline minor diameter D and tolerances of external spline major diameter D, see Table 25 of GB/T3478.1. 3.3 The tolerances of internal spline major diameter D and external spline minor diameter D are selected from GB1800 standard tolerances IT12, IT13 or IT14. 3.4 When the internal and external splines are machined by the generating method, the root radius is variable. This standard gives the minimum curvature radius of the root arc, see GB/T 3478.1 Table 26.
3.5 When the selected inspection method is not the basic method, the maximum effective tooth width, the minimum actual tooth width, the minimum effective tooth thickness and the maximum actual tooth thickness are calculated as follows:
The maximum effective tooth width Evmax=Emax-A; the minimum actual tooth width Emin-Evmin+A; the minimum effective tooth thickness Svmin-Smin+A; the maximum actual tooth thickness Smx=Svurux-A. 3.6 When the spline tooth side fit category is not H/h, the size of the external spline in the dimension table should be calculated as follows: The maximum effective tooth thickness Svmax=S+esv;
The minimum actual tooth thickness SminSvmax-(T+a). Where: esv - upper deviation of effective tooth thickness, see Table 23 of GB/T3478.1; (T+A) - total tolerance, see Table 7 to Table 15 of GB/T3478.1. Approved by the State Administration of Technical Supervision on July 12, 1995 and implemented on May 1, 1996
GB/T 3478.4—1995
The upper deviation of the major and minor diameters of external splines is shown in Table 24 of GB/T3478.1. 3.7 The value of the maximum value of the involute starting circle diameter Dremax of the external spline in this dimension table is calculated according to the formula derived from the rack-shaped tool processing principle.
When the spline tooth side fit category is not H/h, DFem can be calculated according to the formula in Table 3 of GB/T3478.1. Table 145° internal spline
Module m=0.25
Pitch circle
Base circle diameter
.4.0659
Round tooth root
Minimum effective tooth width
Evain-0.393
Involute end
Stop circle diameter
Drimin
Maximum actual tooth width
Emax Evni +(T+A)
Pitch circle
Base circle diameter
13. 611 8
14. 142 1
14. 672 5
16. 617 0
16. 793 8
17. 324 1
17. 677 7
Round tooth root
3478.4—1995
Continued Table 1
Involute
Stop circle diameter
DFimin
Actual maximum value of tooth width
Emax =Evmin +(T+^)
Pitch circle
Module m=0.5
Base circle diameter
12. 374 4
14. 142 1
14. 495 7
17. 677 7
18. 031 2
19. 091 9
Round tooth root
GB/T 3478.4-1995
Table 245° internal spline
Minimum value of effective tooth space width
Evmin=0.785
End diameter of opening line
Dirmin
Maximum value of actual tooth space width
EmxEvmin +(T+a)
Pitch circle
Base circle diameter
21. 213 2
22. 627 4
24. 041 6
25. 102 3
26. 162 9
27. 577 2
28. 284 3
31. 466 3
33. 941 1
Flange root
GB/T 3478.4-1995
Continued Table 2
Involute end
Stop circle diameter
Dpimin
Actual maximum value of tooth width
Emax=Evrain +(T+)
.0.863
Pitch circle
Module m=0.75
Base circle diameter
10. 076 3
15, 909 9
16. 970 6
18. 031 2
19. 091 9
19. 622 2
22. 804 2
23. 864 9
24. 395 2
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28. 107 5
Croenoid root
GB/T 3478.4—1995
Table 345° internal spline
Minimum effective tooth width
Straight Evmin=1.178
Involute end
Stop circle diameter
Ditrin
Maximum actual tooth width
Erax - Evmin +(T+^)
Pitch circle
Base circle diameter
51. 972 3
Flange root
GB/T 3478.4-1995
Continued Table 3
Involute end
Stop circle diameter
DFimin
Actual maximum value of tooth width
Emax-Evmi+(T+^)
.1.267
.1.330
Pitch circle
Base circle diameter
11. 313 7
Module m=1
Flange root
16. 263 5
21. 213 2
26. 162 9
28. 284 3
31, 112 7
33. 941 1
GB/T 3478.4--1995
Table 4 · 45° internal spline
Minimum value of effective tooth width Evmin=1.571
Involute end
Stop circle diameter
DEimin
Actual maximum tooth width
Em=Evmin+(T+a)
Pitch circle
Base circle diameter
50.911 7
65.760 9
67.175 1
Round tooth root
GB/T 3478.4—1995
Continued Table 4
Involute end
Stop circle diameter
Actual maximum tooth width
Emax Evmain+(T+)
Pitch circle
Module m=1.25
Base circle diameter
17. 677 7
29. 168 2
44. 194 2
Round tooth root
GB/T 3478.4—1995
Table 545° internal spline
Minimum effective tooth space width
Evmin=1.963
Involute end
Stop circle diameter
.55.00
Maximum actual tooth space width
Emax =Evwin +(T+^)
2, 127
Pitch circle
Base circle diameter
60. 104 1
67. 175 1
77. 781 7
78. 665 6
81. 317 3
Round tooth root
GB/T 3478.4--1995
Continued Table 5
Involute end
Stop circle diameter
DFimin
Actual maximum value of tooth width
Emx=Evmin +(T+^)
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