Electromechanical actuator and shading device including such an electromechanical actuator

An electromechanical actuator of a shading device,

• the electromechanical actuator comprising:
• a casing,
• an electric motor,
• a gearbox, the gearbox comprising at least one reduction stage, the reduction stage comprising a sun gear and a plurality of planet gears, the sun gear comprising at least one bore,
• a spring-applied brake, and
• a centring shaft,
• the electric motor, the gearbox and the spring-applied brake being mounted within the casing,
• the spring-applied brake comprising:
• a coil spring,
• a drum, the drum comprising a friction surface, the friction surface being configured to cooperate with at least one turn of the coil spring,
• an input member, the input member comprising at least a first bore, and
• an output member, the output member comprising a first bore,
• the centring shaft being mounted inside the first bore of the output member and the bore of the sun gear,
• wherein
• the output member comprises at least one second bore,
• the spring-applied brake further comprises a bushing, the bushing comprising at least one bore, the centring shaft being mounted inside the bore of the bushing,
• the bushing is mounted inside the first bore of the input member with an interference fit,
• the bushing is mounted inside the second bore of the output member with a loose fit,
• the reduction stage further comprises a planet carrier, the planet carrier comprising at least one bore,
• the gearbox further comprises a further reduction stage, the further reduction stage comprising a further sun gear, a plurality of further planet gears and a further planet carrier, the further sun gear comprising at least one bore, the further planet carrier comprising at least one bore,
• the centring shaft is mounted inside the bore of the planet carrier of the reduction stage, the bore of the further sun gear of the further reduction stage and the bore of the further planet carrier of the further reduction stage,
• the planet carrier of the reduction stage comprises a coupling interface,
• the output member comprises a coupling interface,
• the coupling interface of the planet carrier of the reduction stage and the coupling interface of the output member are identical,
• the sun gear of the reduction stage comprises a first set of teeth,
• the further sun gear of the further reduction stage comprises a first set of teeth, and the first set of teeth of the sun gear of the reduction stage and the first set of teeth of the further sun gear of the further reduction stage are identical.