US 12,320,411 B2
Electromechanical linear actuator with hollow shaft motor
Reiner Knoell, Burgsinn (DE); Marco Knoell, Burgsinn (DE); and Michael Goldbach, Lohr A. Main (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Filed by Robert Bosch GmbH, Stuttgart (DE)
Filed on Jul. 1, 2023, as Appl. No. 18/346,211.
Claims priority of application No. 10 2022 206 871.8 (DE), filed on Jul. 6, 2022.
Prior Publication US 2024/0011544 A1, Jan. 11, 2024
Int. Cl. F16H 25/24 (2006.01); F16H 25/20 (2006.01); F16H 25/22 (2006.01)
CPC F16H 25/2454 (2013.01) [F16H 2025/2031 (2013.01); F16H 2025/2075 (2013.01); F16H 2025/2078 (2013.01); F16H 25/2252 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An electromechanical linear actuator, comprising:
an electric motor having a hollow shaft;
a linearly movable extension tube;
a housing; and
a threaded drive having a threaded spindle and a threaded nut,
wherein
the threaded spindle is coupled to the hollow shaft of the electric motor via a rotationally fixed connection,
the threaded nut is fastened to the linearly movable extension tube,
in a maximally retracted state of the linearly movable extension tube, the threaded nut is arranged at least partly in an interior of the hollow shaft,
the housing includes a first housing tube with a first longitudinal extent along an axis of the electromechanical linear actuator, and a second housing tube with a second longitudinal extent along the axis of the electromechanical linear actuator,
a bearing is arranged in the second housing tube on an outer circumference of the hollow shaft on an end portion of the hollow shaft facing away from the rotationally fixed connection,
the bearing is configured to mount the hollow shaft in the housing,
the electric motor is primarily arranged in the second housing tube, and
the first longitudinal extent is greater than the second longitudinal extent.