GB/T 3478.6-2008Straight cylindrical involute splines - Metric module, side fit - Part 6: 30°pressure angle M and W values (English PDF)

3.1 Calculation formula for measuring the size of internal spline bar

Figure 1 D'Ri = Db [tanalphaci-tan (alphaci-EmaxD + invalphaci-inv30 ° )] (1) Where. D'Ri - the calculated diameter of the bar;

alphaci - the pressure angle on the spline and the rod contact point, expressed in radians, alphaci = cos-1 Dci --- internal spline and measuring rod at the point of contact diameter.

Dci = Deemax + Dimin2 Deemax --- the maximum size of the external spline; Dimin --- minimum value of internal spline trails;

Emax --- the actual maximum cogging width, the table by the tolerance level of 7 values. Invalphaci = tanalphaci-alphaci; Inv30 ° = 0.0537515.

The rod diameter DRi is selected according to R40 in GB/T 321. If D'Ri is not the R40 series value, it should be selected to be the closest to D'Ri The value.

Figure 2 Even teeth. MRimax = Dbcosalphaimax- DRi (2) MRimin = Dbcosalphaimin- DRi (3) Odd teeth. MRimax = Dbcosalphaimax × Cos90 ° z-DRi (4) MRimin = Dbcosalphaimin × Cos90 ° z-DRi (5) Where. MRimax --- the maximum value of the spline bar spacing; MRimin - the minimum value of the spline bar spacing;

alphaimax --- When E is Emax, the internal pressure on the center circle of the pressure bar.

Invalphaimax = EmaxD + inv30 ° - alphaimin --- When E is Emin, the internal pressure on the center circle of the internal pressure bar.

Invalphaimin = EminD + inv30 ° - DRi - internal spline bar diameter.

3.2 Calculation formula for measuring the size of external spline bar

D'Re = Db [tan (alphace + invalphace + pi z - Smin D -inv30 ° ) -tanalphace] (6) Where. D'Re - the calculated diameter of the bar;

alphace - the pressure angle on the outer spline and the rod contact point, expressed in radians, alphace = cos-1 Dce --- outside the splines and measuring rods at the point of contact.

Dce = Deemax + Dimin2 Smin --- the actual minimum tooth thickness, the table by tolerance level 7 and the basic deviation of h value; Invalphace = tanalphace-alphace.

The rod diameter DRe is selected according to R40 in GB/T 321. If D'Re is not the R40 series value, the value closest to D'Re should be selected.

Figure 4 Even teeth. MRemin = Dbcosalphaemin + DRe (7) MRemax = Dbcosalphaemax + DRe (8) Odd teeth. MRemin = Dbcosalphaemin × Cos90 ° z + DRe (9) MRemax = Dbcosalphaemax × Cos90 ° z + DRe (10) Where.

MRemin - the minimum value of the spline span of the spline;

MRemax - the maximum value of the spline span between the outer splines;

alphaemin --- When S is Smin, the pressure angle on the center circle of the external spline bar.

Invalphaemin = DReDb + Inv30 ° + SminD - alphaemax - when S is Smax, the pressure angle on the center circle of the external spline bar.

Invalphaemax = DReDb + Inv30 ° + SmaxD - DRe - outside the spline with the diameter of the rod.

Wmin --- the average length of the common line of the minimum;

Wmax --- the maximum length of the average length of the common law;

K - number of teeth, K = z/6 + 0.5 (take integer); (T + lambda) --- total tolerance; T --- processing tolerances; Esv --- the role of tooth thickness on the deviation.

5.1 Measuring the size of the internal spline

Modulus of 0.5mm ~ 10mm, the number of teeth 10 to 100, the tolerance level of 4 to 7, the basic deviation of the h of the internal spline measurement with the amount of stick Diameter DRi, maximum rod spacing MRimax and minimum MRimin See Table 1 to Table 14.

5.2 Measuring the size of the outer spline

5.2.1 The amount of the outer spline is 0.5mm ~ 10mm, the number of teeth is 10 ~ 100, the tolerance level is 4 ~ 7, the basic deviation is h Rod diameter DRe, minimum value of span distance MRemin and max MRemax see Table 15 to Table 28.

5.2.2 When the basic deviation of the spline is not h, the span distance shall be calculated according to the formula listed in 3.2.2 or calculated according to the following formula After the difference deltaMRe, the span value in the table is corrected. deltaMRe = Ke · esv (13)

5.3

The rod diameter DRi and DRe listed in Tables 1 to 28 are determined according to 3.1.1 and 3.2.1. If necessary, make a number on the bar Plane to avoid contact with the spline trails.

5.4

When the actual selection of the rod diameter and the diameter listed in the standard are different, the maximum distance between the spline rod spacing MRimax and the minimum MRimin, the minimum value of the spline span distance MRemin and the maximum value MRemax, should be calculated according to the actual rod diameter.

6.1

Modulus 0.5mm ~ 10mm, the number of teeth 10 ~ 100, the tolerance level of 4 to 7, the basic deviation of h outside the average length of the normal length of the horn Degrees W limit values, see Table 29 to Table 42.

6.2

When the basic deviation of the external spline tooth thickness is not h, the difference deltaW of the average length of its common line is calculated as follows. deltaW = esv · cos 30 ° = 0.866esv (14)