GB/T 3478.3-1995 Cylindrical spur involute spline 37.5° pressure angle dimension table GB/T3478.3-1995 standard download decompression password: www.bzxz.net

UDC 621. 886. 6
National Standard of the People's Republic of China
GB/T3478.1~3478.9--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
37.5°pressure angle dimension tables
Straight cylindrical involute splines-37. 5°pressure angle dimensions tablesGB/T 3478.3—1995
This standard adopts the second part "Dimensions" of ISO4156-1981 "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 a standard pressure angle of 37.5° round root (hereinafter referred to as 37.5° round root).
This standard is applicable to involute splines with a pressure angle of 37.5°, a module of 0.5 to 10 mm and side fits 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 side 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'Tolerance and fit General standard tolerance and basic deviation 3 Dimension table
3.1 Dimension table of splines with 7.5° 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 D., 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 Table 26 of GB/T 3478.1.
3.5 When the selected inspection method is not the basic method, the maximum effective tooth space width, the minimum actual tooth space width, the minimum effective tooth thickness and the maximum actual tooth thickness are calculated as follows:
The maximum effective tooth space width Evmax=Emax-in; the minimum actual tooth space width Emin=Evmin+in; the minimum effective tooth thickness Svmin=Smin+in; the maximum actual tooth thickness SmxSvmax-in. 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 Svuax=S+esv;
The minimum actual tooth thickness Smin=Symax-(T+in). Where: esy -
Upper deviation of effective tooth thickness, see Table 23 of GB/T3478.1; (T+A) - total tolerance, see Table 8 to Table 21 of GB/T3478.1 Approved by the State Administration of Technical Supervision on July 12, 1995 and implemented on May 1, 1996
GB/T3478.3--1995
Upper deviation of major and minor diameters of external splines, see Table 24 of GB/T3478.1. 3.7 The value of the maximum value DFemx of the involute starting circle diameter of external splines 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, DFemax can be calculated according to the formula in Table 3 of GB/T3478.1. , Table 13 7.5° internal spline
Module m=0.5
Pitch circle
Base circle diameter
12. 297 0
18. 247 1
Round tooth root
Minimum effective tooth space width
Involute end
Stop circle diameter
Drimin
Evmin=0.785
Maximum actual tooth space width
Emax =Evain +(T+^)
.0.891
Pitch circle
Base circle diameter
26. 180 7
27. 767 4
28. 164 0
32. 924 2
33. 717 5
36. 890 9
37. 287 6
37. 684 3
Flange root
GB/T 3478. 3---1995
Continued Table 1
Involute end
Stop circle diameter
Drirnin
Actual maximum tooth width
Emx =Evmin +(T+a)
Pitch circle
Module m=0.75
Base diameter
Flange root
GB/T 3478. 3--1995
Table 237.5° internal spline
Minimum effective tooth width
Involute end
Stop circle diameter
DFimnin
Evmin-1.178
Actual maximum tooth width
Emx-Evmia+(T+a)
Pitch circle
Base circle diameter
41,651 1
45. 221 1
46. 411 2
47. 006 2
48. 196 2
54. 741 4
58. 311 5
Flange tooth root
GB/T 3478.3—1995
Continued Table 2
Involute end
Stop circle diameter
Drimin
Actual maximum value of tooth width
Emax=Evmin+(T+a)
Pitch circle
Module m=1.00
Base circle diameter
23. 007 2
34. 114 2
42. 047 7
Flange tooth root
47, 40
GB/T 3478.3--1995
Table 337.5° internal spline
Minimum effective tooth width
Involute end
Stop circle diameter
DFimin
Evmin 1.571
Actual maximum tooth width
Emax =Evnain+(T+^)
Pitch circle
Base circle diameter
57. 121 4
57. 914 8
66. 641 7
72. 195 2
73. 781 9
76. 161 9
Round tooth root
GB/T 3478.3—1995
Continued Table 3
Involute end
Stop circle diameter
Drimin
Actual maximum value of tooth width
Emax=Evmin+(T+a)
Pitch circle
Module m=1. 25
Base circle diameter
14. 875 4
24. 792 3
25. 784 0
27. 767 4
28. 759 1
31. 734 1
41. 651 1
Round tooth root
GB/T 3478.3--1995
Table 437.5° internal spline
Minimum effective tooth width
Evmin=1.963
Involute end
Stop circle diameter
DFimin
Actual maximum tooth width
Erax =Evrain +(T+^)
Pitch circle
Base circle diameter
65. 451 7
69. 418 4
74.376 9
75. 368 6
81. 318 7
88. 260 6
89. 252 3
Flange root
GB/T 3478.3—1995
Continued Table 4
Involute end
Stop circle diameter
DFimin
Actual maximum value of tooth width
Ernax Evmin +(T+A)
Pitch circle
Module m1. 5
Base circle diameter
15. 470 4
47. 601 2
63. 071 6
GB/T 3478.3--1995
37.5° internal spline
Minimum effective tooth width
Evmin=2.356
Involute end
Stop circle diameter
DFirnin
Actual maximum tooth widthbZxz.net
Emx=Evmin+(T+a)
Pitch circle
Base circle diameter
67. 831 7
70. 211 8
71. 401 8
73. 781 9
76. 161 9
82. 112 1
99. 962 5
101.152 6
105.912 7
107. 102 7
111.862 8
117.813 0
Crocutaneous tooth root
GB/T 3478.3—1995
Continued Table 5
Involute end
Stop circle diameter
DFimin
2, 401
Actual maximum value of tooth width
Emax=Evnin+(T+A)
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