HELICAL GEAR TRAIN Russian patent published in 2004 - IPC

FIELD: basic engineering. SUBSTANCE: invention can be used in reduction gears of rolling mills, crushing equipment of integrated concentration works, heat power stations, cement industry and other branches of industry. Proposed helical gear train contains gear and wheel with sections of tooth profile convex at addendum part of tooth and convex at dedendum part of tooth. Convex-concave section of profile are separated by involute section of even height on addendum and dedendum of teeth. Convex-concave sections of tooth profile in normal section of train have form of arcs of circumference with radius ρ_n.. Beginning of radius ρ_n of convex and concave sections of tooth profile is located on tooth line containing pitch point. End of one radius is located on top line of involute surface of tooth addendum, and end of second radius, on bottom line of involute surface of tooth dedendum. Heights of convex-concave sections of profile on addendum and dedendum of teeth are chosen to correspond to definite dependences. EFFECT: improved vending and contact strength, provision of smooth operation and adaptability of manufacture. 3 dwg