Patent ID: 6139455
Filing Date: 2000-10-31
Classification: F16H

Abstract:
Apparatus in combination with an existing vertically oriented primary speed-reduction output shaft of a light weight rotary-wing aircraft, to an existing vertically oriented main rotor-shaft, wherein the combination comprises:(a) a driving cog-belt sprocket (23), of a small external diameter, on said primary speed-reduction output shaft (11);(b) said driving cog-belt sprocket being of steel or cast-iron construction;(c) said driving cog-belt sprocket comprising a multiplicity of spaced-apart transverse lands (27) and grooves (28) about the outer peripheral face thereof;(d) said driving cog-belt sprocket being of a width greater than the cog-belt (25); which operates thereupon;(e) said driving cog-belt sprocket comprising cog-belt retaining means;(f) a driven cog-belt sprocket (24), of a greater external diameter, on said rotorshaft (12);(g) said driven cog-belt sprocket being of an aluminum-alloy construction;(h) said driven cog-belt sprocket comprising a multiplicity of spaced-apart transverse lands (27) and grooves (28) about the outer peripheral face thereof;(i) said driven cog-belt sprocket having a width greater than the cog-belt which operates thereupon;(j) said driven cog-belt sprocket comprising cog-belt retaining means;(k) said driven cog-belt sprocket having cog-belt centering means (35), and;(l) a driving cog-belt (25), encompassing and tautly engaging said driving cog-belt sprocket and said driven cog-belt sprocket;(m) said cog-belt centering means comprises a peripheral face (34) adapted to provide an arcuate segment of a constant radius crown (33) thereacross, centered between the opposing sides thereof;(n) said crown extends outwardly therefrom for a dimension of approximately 0.005 inch.