STRAIN WAVE GEARING DEVICE WITH PURE SEPARATION OF TWO STRESSES

• Main Author: ISHIKAWA, Shoichi
• Format: Patent
• Language: English; French; German
• Published: 21.11.2018
• Subjects: BLASTING; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; THERMAL INSULATION IN GENERAL; WEAPONS

In a strain wave gearing, the addendum tooth profile of an internal gear is defied by the formula a and that of an external gear is by the formula b at a principal cross-section located at a tooth-trace-5direction center of the external gear, on the basis of a movement locus (Mc) of º = 1 of the teeth of the external gear with respect to those of the internal gear in the principle cross-section taken at the center of the tooth trace of the external gear obtained when the tooth meshing is approximated by rack meshing. It is possible to avoid superimposition of flexion-induced bending stresses and tensile stresses caused by load torque at the major-axis locations of the external gear, and the transmission torque capacity of a strain wave gearing can be improved. x Cal = 0.25 mn À + ¸ ˆ’ sin ¸ y Cal = 0.5 mn ˆ’ 1 + cos¸ where 0 ‰¤ ¸ ‰¤ À x Fa 1 = 0.25 mn À ˆ’ ¸ + sin¸ ˆ’ µ cos ¸ / 2 ˆ’ sin ¸ / 2 y Fa 1 = mn 0.5 1 ˆ’ cos¸ ˆ’ µ / 4 sin ¸ / 2 ˆ’ cos ¸ / 2 where 0 ‰¤ µ ‰¤ 0.1 and 0 ‰¤ ¸ ‰¤ À