SCOPE
This high speed helical gear units standard is provided as a basis for improved communication regarding:
− establishment of uniform criteria for rating;
− guidance for design considerations; and,
− identification of the unique features of high speed gear units.

Application
Operational characteristics such as lubrication, maintenance, vibration limits and testing are discussed. This standard is applicable to enclosed high speed, external toothed, single and double helical gear units of the parallel axis type. Units in this classification are:
− single stage units with pitch line velocities equal to or greater than 35 m/s or rotational speeds greater than 4500 rpm;
− multi-stage units with at least one stage having a pitch line velocity equal to or greater than 35 m/s and other stages having pitch line velocities equal to or greater than 8 m/s.

When specific experience exists, this standard may be applied to gear units that operate below the limits specified above.
Marine propulsion, aerospace and vehicle gearing are not covered by this standard.

The knowledge and judgment required to evaluate the various rating factors come from years of accumulated experience in designing, manufacturing, and operating gear units. Empirical factors given in this standard are general in nature. This standard is intended for use by the experienced gear designer, capable of selecting reasonable values for the factors. It is not intended for use by the engineering public at large.

Pages: 82
ISBN: 978-1-64353-201-1