本国际标准规定了封闭式、精密、单螺旋和双螺旋的最低要求， 小齿轮转速为3000 min的平行轴设计的一级和二级增速器和减速器？1或 更大，或25 m/s或更大的节距线速度，用于特殊用途应用。这种应用通常将 需要在没有安装备用设备的情况下长时间连续运行，并且对 装置的继续运行。通过协议，本国际标准可用于其他服务。 本国际标准还规定了满足以下标准的齿轮的额定值方法: a)齿轮精度 ？齿精度:ISO 1328-1:19 95中给出的精度等级4或更高，适用于两种单节距偏差、fpt、 和总累积俯仰偏差Fp， ？小齿轮和车轮的螺旋之间的总螺旋偏差F β:精度等级4或更好，如中给出的 ISO 1328-1:19 95； b)横向接触比的范围:1.2<ε α<2.0； c)重叠比ε β w 1.0； d)螺旋角:5U β U 35°； e)小齿轮或齿轮的工作侧面:设置有轮廓修改以获得良好的共轭齿载荷 沿接触路径分布； f)小齿轮或齿轮的工作侧面:根据需要进行修改以补偿扭转和弯曲 偏转，必要时，对于节线速度超过100 m/s的齿轮，也适用于热 扭曲； g)齿轮润滑:纯矿物油，粘度等级VG-32或VG-46(参见ISO 3448)； h)齿轮齿的材料:质量MQ或更好，符合ISO 6336-5:19 96。

This International Standard specifies the minimum requirements for enclosed, precision, single and double helical, one- and two-stage speed increasers and reducers of parallel shaft design with pinion speeds of 3000 min？1 or greater, or pitch line velocities of 25 m/s or greater, for special purpose applications. Such applications will typically be required to operate continuously for extended periods, without installed spare equipment and are critical to the continued operation of the installation. By agreement this International Standard may be used for other services. This International Standard also specifies a method of rating gears which meet the following criteria: a) gear accuracy ？ teeth accuracy: accuracy grade 4 or better as given in ISO 1328-1:1995, for both single pitch deviation, fpt, and total cumulative pitch deviation, Fp, ？ total helix deviation Fβ between the helices of the pinion and wheel: accuracy grade 4 or better as given in ISO 1328-1:1995; b) range of the transverse contact ratios: 1,2 < εα < 2,0; c) overlap ratio εβ W 1,0; d) helix angle: 5 u β u 35°; e) working flanks of the pinion or gear: provided with profile modifications to obtain a good conjugate tooth load distribution along the path of contact; f) working flanks of pinion or gear: modified as necessary to compensate for both torsional and bending deflections and, when necessary for gears with pitch line velocities in excess of 100 m/s, also for thermal distortions; g) gear lubrication: straight mineral oil, viscosity grade VG-32 or VG-46 (see ISO 3448); h) material of the gear teeth: quality MQ or better, in accordance with ISO 6336-5:1996.