scope:

This standard applies to crossed helical gears with the materials pairing metal/plastic and a shaft angle of 90° where the pinion takes the form of a metal worm with a tooth number below six and the helical gear is made of a partially crystalline thermoplastic. Basic racks standardized on the basis of DIN 867 and DIN 58400 or alternatively special profiles are used as the reference profiles, with modules greater than 0,3 mm. The standard covers the calculation of load-carrying capacity while paying due regard to the special properties of plastic. Since in some cases only a few or even no characteristic values at all are as yet available, this standard will form the basis for determining permissible values.