IS 8843-1978

标准号：IS 8843-1978
发布日期：1978/11/1 12:00:00
实施日期：1999/12/31 12:00:00
适用范围：1.1 This standard specifies basic tooth form modules and accuracy require-ments of high grade helical gears for turbine and similar drives. It does not, at present, cover gear loading and IS: 4460-1967〓 shall be used for rating of these gears. This standard applies to four classes of gears, designated as Class A0, Class Al, Class A2 and Class B. Class A0 is the highest.1.1.1 The accuracies laid down for Classes A0, Al, and A2 are generally appropriate for gears running at pitch line speeds higher than about 50 m/s or where any other factor demands the highest class. For lower pitch line speeds, the standards of accuracy laid down for Class B will generally be appropriate.