This standard specifies all the spline dimensions required for cylindrical spur involute splines with 30° standard pressure angle flat root and round root (hereinafter referred to as 30° flat root and 30° round root). This standard applies to involute splines with a pressure angle of 30°, a module of .5 to 10 mm, and a tooth side fit as specified in GB/T 3478.1. GB/T 3478.2-1995 Dimensions of 30° pressure angle for cylindrical spur involute splines GB/T3478.2-1995 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 splines1995-0712 Issued
1996-05-01 Implementation
State Administration of Technical Supervision
National Standard of the People's Republic of China
Cylindrical spur involute splines
30° pressure angle dimension table
Straight cylindrical involute splines-30° pressure angle dimenslons tablesGB/T 3478.2—1995
Replaces GB3478.2—83
This standard adopts the second part "Dimensions" of the standard IS04156-1981 "Cylindrical spur involute splines - Metric modules - Side fits - General, dimensions and inspection".
1 Subject content and scope of application
This standard specifies all spline dimensions required for cylindrical spur involute splines with 30° standard pressure angle flat root and round root (hereinafter referred to as 30° flat root and 30° round root).
This standard is applicable to involute splines with a pressure angle of 30°, a module of 0.5 to 10 mm and side fit as specified in the GB/T3478.1 standard.
This dimension table is compiled according to the calculation formula in Table 3 of GB/T3478.1 and the side fit is H/h, and the basic inspection method is adopted. 2 Reference standards
GB/T3478.1 Cylindrical spur involute spline module Basic profile tolerance GB1800 General tolerances and fits Standard tolerances and basic deviations 3 Dimension tables
3.1 Dimension tables of splines with 30° flat tooth root and 30° round tooth root, module 0.5 to 10 mm, tolerance grades 4, 5, 6 and 7, see Tables 1 to 28.
3.2 Limit deviations of internal spline minor diameter D and tolerances of external spline major diameter De, see Table 25 of GB/T3478.1. 3.3 Tolerances of internal spline major diameter D and external spline minor diameter D, select from the standard tolerances IT12, IT13 or IT14 of GB1800. 3.4 When the internal and external splines are machined by the generating method, the radius of the tooth root arc is variable. This standard gives the minimum curvature radius of the tooth root arc, see GB/T 3478.1 Table 26.
3.5 When the selected inspection method is not the basic method, the maximum value of the effective tooth space width, the minimum value of the actual tooth space width, the minimum value of the effective tooth thickness and the maximum value of the actual tooth thickness are calculated as follows:
The maximum value of the effective tooth space width Evmx = Emax-in; the minimum value of the actual tooth space width EminEvmin+^; the minimum value of the effective tooth thickness Symin = Smin+in; the maximum value of the actual tooth thickness SmSymx-in.
3.6When the spline tooth side fit category is not H/h, the dimensions of the external spline in the dimension table shall be calculated as follows: Maximum effective tooth thickness
Symax S+ esv;
Minimum actual tooth thickness
Where: esv -
Smin = Symax -- (T+ a).
For the upper deviation of the effective tooth thickness, see Table 23 of GB/T3478.1; for the total tolerance of GB/T3478.2—1995, approved by the State Administration of Technical Supervision on July 12, 1995, and implemented on May 1, 1996, see Tables 8 to 21 of GB/T3478.1. The upper deviation of the major and minor diameters of the external spline 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, DFemx can be calculated according to the formula in Table 3 of GB/T3478.1. 67
Pitch circle
11. 258 3
Module m=0.5
Flat tooth root
Round tooth root
GB/T3478.2—1995
Table 130° internal spline
Minimum effective tooth width Evmin=0.785
Involute end
Perfect circle diameter
DFinaia
Maximum actual tooth width
Emx=Evmia+(T+2)
Pitch circle
Flat tooth root
Round tooth root
GB/T 3478.2-1995
Continued Table 1
Zhe open line end
Perfect circle diameter
Drimin
Actual tooth width maximum value
Emex =Evnin +(T+^)
Pitch circle
11. 041 8
114.938 9
18. 836 1
21. 434 1
26. 630 3
GB/T 3478. 2—1995
Table 230° internal spline
Module m=0.75
Major diameter． ．
Flat tooth root
Round tooth root
Minimum value of effective tooth space width Evmin=1.178
Involute end
Positive diameter
Drimia
Maximum value of actual tooth space width
Em=Evin+(T+)
Pitch circle
.57.75
59. 106 2
63.003 31
Flat tooth root
Round tooth root
GB/T 3478.2—1995
Continued Table 2
Involute end
Stop circle diameter
Drimia
Maximum value of actual tooth space width
Emx=Evrin +(T+^)
Pitch circle
11. 258 3
19. 918 6
25. 980 8
29. 444 9
38. 971 1
Module m=1
Flat tooth root
Round tooth root
GB/T 3478.2—1995
Table 330° internal spline
Minimum value of effective tooth space width Evmin=1.571
Involute end
Stop circle diameter
Drimio
Maximum value of actual tooth space width
Emax=Evmin +(T+^)
Pitch circle
63. 219 9
64. 085 9
169.282 0wwW.bzxz.Net
71. 014 1
71. 880 1
72. 746 1
73. 612 2
77. 076 3
Flat tooth root
Round tooth root
GB/T 3478.2—1995
Continued Table 3
Involute end
Stop circle diameter
Dfrmin
Actual maximum value of tooth width
Emax = Evmin +(T+^)
Pitch circle
28. 145 8
41. 136 2
47. 631 4
54. 126 6
GB/T3478.2—1995
Table 430° internal spline
Module m=1.25
Flat tooth root
Round tooth root
Minimum effective tooth space width Evmin=1.963
Involute end
Stop circle diameter
Dirnin
.2.002
Maximum actual tooth space width
Emux =Evnin +(T+^)
grading circle
111, 25
67. 117 0
86. 602 5
97. 427 9
102.840 5
106.088 1
107. 170 6
108.253 2
Flat tooth root
Round tooth root
GB/T 3478.2—1995
Continued Table 4
Break line end
Stop circle diameter
DFimin
108, 78
Actual maximum value of tooth groove width
Emax =Evmin +(T+^)
Pitch circle
12. 990 4
22. 083 6
25. 980 8
42. 868 3
51.961 51
61. 054 8
64,9519
70.148 11
GB/T3478.2—1995
Table 5 30° internal spline
Module m=1. 5
Flat tooth root
Round tooth root
Minimum effective tooth width Eymin=2.356
Involute end
Stop circle diameter
Drimio
Maximum actual tooth width
Eax =Evmin+(T+a)
.2.454
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