The helicopter rotor head assembly 100 is suitable for a helicopter with a gearbox 101 driving the rotor head and bearing the helicopter weight in flight. The assembly has a number of servo units 104a-d, each with an output shaft (fig.3,302); a mounting structure 105 secured to the gearbox; and an actuator (fig.3,9), fixed to the mount, suitable for connection to a swash plate control rod 108a-d. Each servo unit is releasably attached to the mount, by an element such as a screw 14, so the output shaft engages the actuator. The rotor head may have a first swashplate 102a coupled to a first drive shaft (fig.1,1006), and a second swashplate 102b coupled to a second co-axial drive shaft (fig.1,1008). Preferably there are four servo units, three control the position and/or orientation of the swashplates, the fourth adjusts the axial position of the first swashplate relative to the second swashplate. A control arm (fig.3,13) may be coupled to the actuator and the control rod, converting actuator rotation into linear control rod motion. The gearbox may have an opening which the control rod passes through, between the actuator and the swashplate.
Helicopter servo mounting
2025-01-22
Patent
Electronic Resource
English
SAE Technical Papers | 2020