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FROM YOUR BELL HELICOPTER TEXTRON REPRESENTATIVE.
PRODUCT DATA
JANUARY 2003
ANTI-TORQUE SYSTEM
The tail rotor drive system consists of four shafts, three hanger bearing assemblies,
and a 90° gearbox connected in line between the transmission and the tail rotor. Each
tail rotor driveshaft consists of an aluminum alloy tube with an attachment adapter
riveted to each end. All shafts are dynamically spin balanced to provide minimum
vibration at operating RPM. The three drive shafts are interchangeable.
The tail rotor drive shafts are supported and interconnected by three hanger bearing
assemblies. Each assembly consists of two attachment adapters on a short splined
shaft through a single row sealed ball bearing in a ring shaped hanger equipped with
four mounting lugs for attachment to their support fitting. Each hanger bearing has a
redundant safety strap retainer which maintains alignment in the event of bearing
failure.
The No.1 driveshaft is connected to the transmission by a crowned-tooth spline coupling
which accommodates the normal motion of the transmission. The remaining shaft sections
and the gearbox are connected by Thomas-type flexible plate couplings. These couplings
feature high strength redundant load paths, and are not subject to misalignment,
overheating, or uneven wear.
Summary of Contents for BELL 430
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