1、 I Part 3 IdLIUI 13 UDC 621.833.1 : 621.753.1 DEUTSCHE NORMEN August 1978 DIN Tolerances for Cylindrical Gear Teeth Tolerances for Pitch-span Devi-“- 3962 Toleranzen fr Stirnradverzahnungen; Toleranzen fr Teilungs-Spannenabweichungen I 1 Scope The diagram applies to the stating of tolerances of the
2、pitch-span deviation Fpk (amounts in pm) defined in DIN 3960. 2 Other relevant Standards DIN 3960 Definitions and parameters for cylindrical DIN 3962 Part 1 Tolerances for cylindrical gear teeth; tolerances for deviations of individual para- meters J os 3 Determination of tolerances rn, normal modul
3、e in mm d reference circle diameter in mm aears and cvlindrical gear pairs with involute “ - teeth (P centre angle in deg (O) DIN 3961 Tolerances for cylindrical gear teeth; bases L arc length in mm CI E E c - Example: m, = 4.5 mm, d = 360 mm, L = 42.5 mm P 3 pitches A 13.5O centre angle, gear toth
4、quality = 6 Result: Fpk 16 m O0 o EN 9 22 2 nn P 88 8 33 3 41 8 I II II 5000 10000 2 5 10 50 100 SOO lob0 Arc length I! in mm - Continued on page 2 03.81 VeRr.-Nr. 0104 Page 2 DIN 3962 Part 3 In general the tolerancing of the cumulative pitch over 45O and 180 of the gear periphery according to the v
5、aiuesFpm and Fp in DIN 3962 Part 1 is fully adequate. However, where additional tolerances are necessary for any other arc lenghts or angle ranges, they should be selected according to the diagram in this Standard. Fp is at least equal to fp. Therefore if with small arc lengths L it should happen th
6、at Fp fp, then Fp should be made equal totp, see also DIN 3961, August 1978 edition, Section 6.4. Further Standards and codes DIN 3962 Part 2 Tolerances for cylindrical gear teeth; tolerances for tooth trace deviations DIN 3963 Tolerances for cylindrical gear teeth; tolerances for working deviations
7、 DIN 3964 Centre distance allowances and shaft position tolerances of housings for cylindrical gear transmissions DIN 3967 System of gear fits; backlash, tooth thickness allowances and tooth thickness tolerances; bases, calculation of tooth thickness allowances, conversion of allowances for the different measuring methods DIN 3999 Symbols for gear teeth VD INDE 2605 Circular pitches and plane angles. Fundamental terms for angle dimensions, angle measurements, angle standards and their errors
