An Assessment of Some Forms of Follower-Tooth Reduction Gear and its Application to Helicopter Main Rotor Gearboxes.
ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (ENGLAND)
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This Report presents a critical assessment of the cylindrical rotary form of the follower-tooth reduction gear, indicating deficiencies and suggesting improvements. Consideration has been given to the mechanisms application to helicopter main gearboxes and a design study formulated. It is not considered competitive with current types because 1 Although the specific mass of a basic follower-tooth gear is about the same as that of conventional transmissions in similar configurations, the latter have more potential for mass reduction, and their efficiency is higher. 2 The addition of tail rotor and ancillary drive take-offs would increase complexity and weight to a greater extent than in conventional systems. 3 The geometric arrangement and the type and function of the speed reducing components are such that the mechanism would be more sensitive to environmental conditions. 4 Although components are geometrically simple, high manufacturing standards, quality control and assembly difficulties would reflect adversely on costs. 5 Refurbishment would probably entail replacement of most power-transmitting components, bearings and seals, whereas conventional systems normally require only new bearings and seals. Author
- Machinery and Tools