IS 7657 Pt.1-1975

标准号：IS 7657 Pt.1-1975
发布日期：1975/7/1 12:00:00
实施日期：1999/12/31 12:00:00
适用范围：Specifies gear profile, dimensions, material and other requirements for involute spur ring gears for inertia or pre-engaged starters having hardened pinions used for starting internal combustion engines.1.1 This is also applicable to engines used on road vehicles.1.2 This standard is not applicable to ring gears for heavy duty applications which generally have 4 module pinions and gears.