Tubular drive actuator for a roller shutter

A bush-bearing in combination with a tubular home automation actuator,

• the bush-bearing comprising:
• a one-piece ring gear;
• and
• a ring mounted on an end of the ring gear, the ring having an axial cylindrical portion attached to the ring gear and a flat circular portion perpendicular to the axial cylindrical portion,
• wherein the flat circular portion and the axial cylindrical portion are connected together by a curved portion,
• wherein the tubular home automation actuator comprising:
• an actuator tube;
• a geared motor in the actuator tube;
• an output shaft at a first end of the actuator tube;
• and
• a head system at a second end of the actuator tube,
• the actuator tube extending along a longitudinal axis,
• the head system comprising:
• a fixed piece;
• the bush-bearing;
• and
• a head, and
• wherein
• (i) the fixed piece and/or the actuator tube form a bearing surface for rotationally guiding the bush-bearing about the longitudinal axis over a height or substantially over the height of the bush-bearing, or (ii) the fixed piece forms a bearing surface for rotationally guiding the bush-bearing about the longitudinal axis, wherein the bush-bearing partially covers the actuator tube of the tubular home automation actuator.