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FROM YOUR BELL HELICOPTER TEXTRON REPRESENTATIVE.
PRODUCT DATA
JANUARY 2003
TRANSMISSION OPERATION
The transmission converts the engine output speed to a usable main rotor and tail
rotor speed. The reduction is accomplished in three stages, beginning with the outboard
gear assemblies (high-speed spiral bevel gear sets), which are driven by the left /
right input pinion gears. The outboard gear assemblies incorporate the freewheeling
clutches (sprag clutches), whose internal shafts connect to and drive the hydraulic
pumps. The second reduction stage is through the main spiral bevel collector gear,
which combines the power from both inputs, and also powers the tail rotor output gear.
The third reduction stage is through a high contact ratio planetary gear set, where
the collector gears' shaft drives the sun gear, which turns the planetary gears inside
their case (ring gear), revolving the planetary carrier, which is spline-mated to the
main rotor mast.
PLANETARY & RING GEAR SET
MAIN SPIRAL BEVEL COLLECTOR GEAR
HIGH SPEED SPIRAL BEVEL GEAR SET
Summary of Contents for BELL 430
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