GB/T 3478.6-1995 M and W values ​​for 30° pressure angle of cylindrical spur involute splines

GB/T 3478.6-1995 Cylindrical spur involute spline 30° pressure angle M value and W value GB/T3478.6-1995 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 splines1995-0712Promulgated
State Administration of Technical Supervision
Implementation on 1996-05-01
National Standard of the People's Republic of China
Cylindrical spur involute splines
30° pressure angle M value and W value
Straight cylindrical involute splines30° pressure angle--M and W valuesSubject content and scope of application
GB/T 3478.6—1995
This standard specifies the calculation formula and limit dimension table of M value (rod spacing MR, span rod spacing MR) and W value (average length of external spline common normal) of cylindrical spur involute spline with pressure angle of 30°. This standard is applicable to involute spline with angle of 30° according to GB/T3478.1 "Module of cylindrical spur involute spline".
2 Reference standards
GB321 Priority numbers and priority number systems
Basic tooth profile
GB/T3478.1 Module of cylindrical spur involute spline Basic tooth profile tolerance GB/T3478.2 Dimension table of cylindrical spur involute spline with 30° pressure angle Calculation formula of measuring rod measurement dimension
Note: It is allowed to use corresponding steel balls instead of measuring rods. 3.1 Calculation formula for measuring dimensions of internal spline measuring rod 3.1.1 Determination of measuring rod diameter DR (see Figure 1) 30)
a+inva
Approved by the State Administration of Technical Supervision on July 12, 1995 230
Tolerance》Design and manufacturing pressure
Implementation on May 1, 1996
Where: D'R—
GB/T 3478.61995
D' Ri =D,[tanac tan(aei
Calculated diameter of measuring rod;
+ invac:-inv30°)]
Pressure angle at the contact point between the internal spline and the measuring rod, expressed in radians, α-cosD—diameter at the contact point between the internal spline and the measuring rod; Deemax + Ditmin
Deemax
The maximum value of the major diameter of the external spline;
The minimum value of the minor diameter of the internal spline;
-The maximum value of the actual tooth width, the values ​​in the table are taken according to the tolerance grade of 7; invα tanαe — αe,
inv30°=0.0537515
（1）
The measuring rod diameter DR is selected according to R40 in GB321. If D'R is not a value in the R40 series, the value closest to D'R should be selected. 3.1.2 Calculation of rod spacing MR (see Figure 2) DRd
inv30°
Even number of teeth:
Odd number of teeth:
Wherein: MRimax-
MRimin
MRitma
MRimin
MRimax
MRimia
The maximum value of the internal spline rod spacing;
The minimum value of the internal spline rod spacing:
cosαimax
cosαimin
cosaimax
cosαimin
·（3）
（4）
·（5）
GB/T 3478.6—1995
When E is Emax, the pressure angle on the center circle of the internal spline measuring rod; E
invaimax
max+inv30°
When E is E, the pressure angle on the center circle of the internal spline measuring rod; invaimin
+inv30°
Diameter of measuring rod for internal spline
3.2 Calculation formula for measuring size of external spline measuring rod 3.2.1 Determination of measuring rod diameter DR (see Figure 3) DRi
D'R D,Etan(αc + invac +
Wherein: D'&-
-calculated diameter of the measuring rod;
inv30°)—tana..
pressure angle at the contact point between the external spline and the measuring rod, expressed in radians, αe=cos-D. diameter at the contact point between the external spline and the measuring rod; Dee =
×+Dimin
Smin—-actual minimum tooth thickness, the table takes the value according to tolerance grade 7 and basic deviation h; invace = tanace - ac.
（6）
diameter of the measuring rod DR is selected according to R40 in GB321. If D'Re is not a value in the R40 series, the value closest to D'R should be selected. 3.2.2 Calculation of span Mk (see Figure 4) 232
Even number of teeth:
Odd number of teeth:
GB/T3478.6-1995
MRemin
MRemex
MReminbzxZ.net
Wherein: MRemin——minimum span of external spline; MRemax
——maximum span of external spline;
cosaem
cosaemin
cosaemay
——pressure angle on the center circle of external spline when S is Smin; Smin
invaemin
inv30°+
When S is Smax, the pressure angle on the center circle of external spline; invαemax
+ inv30°+
Diameter of measuring rod for external spline.
4 Calculation formula for the average length W of the external spline common normal (see Figure 5) Wmax
nm·cos30°
0.5 yuanm+esv-(T+in)
cos30°co.5 yuanm+D-inv30°+
est -(T+A)
inv30°
（7）
·（9）
（(10）
Wmin—
Wmax --
GB/T 3478.6-—1995
Wmin =cos30[(K - 0.5)nm +D. inv30°+esv -(T+ a)}.Wmsx =Wrin +T.cos30°
Minimum value of the average length of the common normal line;
Maximum value of the average length of the common normal line;
K——number of teeth across, Kz/6+0.5 (rounded); (T+>)—total tolerance
T——machining tolerance;
—upper deviation of effective tooth thickness.
5 Measuring dimensions of measuring rods
5.1 Measuring dimensions of measuring rods for internal splines
·(11)
Diameter of measuring rods for measuring internal splines with a module of 0.5 to 10 mm, a number of teeth of 10 to 100, a tolerance grade of 4 to 7, and a basic deviation of H. Dri, the maximum value MRimax and the minimum value MRimin of the rod spacing are shown in Tables 1 to 14. 5.2 Measuring rod measurement dimensions of external splines
5.2.1 The diameter DRe of the measuring rod for external splines with a module of 0.5 to 10 mm, a number of teeth of 10 to 100, a tolerance grade of 4 to 7, and a basic deviation of h, and the minimum value MRemin and the maximum value MRemax of the cross-rod spacing are shown in Tables 15 to 28. 5.2.2 When the basic deviation of the external spline is not h, the cross-rod spacing dimension shall be calculated according to the formula listed in 3.2.2, or the cross-rod spacing value in the table may be corrected after the difference △MR is calculated according to the following formula. AMr. - K. · esy
Where: K. — Conversion coefficient, see Tables 15 to 28. (13)
5.3 The diameters DR: and DRe of the measuring rods listed in Tables 1 to 28 are determined in accordance with 3.1.1 and 3.2.1. If necessary, a flat surface is made on the measuring rod to avoid contact with the bottom of the spline. 5.4 When the actual diameter of the measuring rod selected is different from the diameter listed in the standard, the maximum value MRimax and minimum value MRimin of the internal spline rod spacing, the minimum value MRernin and maximum value MRetnax of the external spline span rod spacing, shall be calculated according to the actual measuring rod diameter. 6 Limit value of the average length w of the common normal line
6.1 The limit value of the average length W of the common normal line of external splines with a module of 0.5 to 10 mm, a number of teeth of 10 to 100, a tolerance grade of 4 to 7, and a basic deviation of h is shown in Tables 29 to 42.
6.2 When the basic deviation of the tooth thickness of the external spline is not h, the difference △W of the average length of the common normal line is calculated according to the following formula. AW = esv * cos30° - 0.866 . esv234
（14）
30° internal spline
GB/T 3478.6—1995
Table 1 Rod spacing MR
Module m=0.5
For testing
Minimum value of effective tooth width
Evmin-0.785
Rod spacing MR for Emin and Emax
.8.363
45,221
GB/T 3478.6—1995
Continued Table 1
Rod spacing MR for testing Emin and Ema
.32.298
45,312
.44.401
30° internal spline
GB/T 3478.6--1995
Table 2 Rod spacing MR
Module m=0.75
Minimum value of effective tooth space width Evmin=1.178
Rod spacing MR for testing Emin and Ema
For testing
.40.272
54-582
64,017
GB/T 3478.6—1995
Continued Table 2
Rod spacing MRi of Emin and Emax
For inspection
30° internal spline
GB/T 3478.6—1995
Rod spacing MRi
Module m=1
Minimum value of effective tooth space width
Evmin =1. 571
Rod spacing MR of Emin and E
For inspection
11,004
GB/T 3478.6--1995
Continued Table 3
For inspection
Rod spacing MR of Emin and Emx
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