US 12,292,063 B2
Linear actuator
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 Sep. 6, 2023, as Appl. No. 18/462,174.
Claims priority of application No. 10 2022 210 559.1 (DE), filed on Oct. 6, 2022.
Prior Publication US 2024/0117827 A1, Apr. 11, 2024
Int. Cl. F15B 21/02 (2006.01); F15B 21/14 (2006.01); F16H 25/22 (2006.01); F16H 25/20 (2006.01)
CPC F15B 21/02 (2013.01) [F15B 21/14 (2013.01); F16H 25/2252 (2013.01); F16H 2025/2075 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A linear actuator, comprising:
a threaded drive which comprises a threaded nut connected to a cantilever tube and a leadscrew coupled or couplable to a motor for torque transmission, such that by a rotation of the leadscrew the threaded nut and the cantilever tube are linearly movable, and, regardless of the position of the cantilever tube, a first end the leadscrew projects into the cantilever tube and is connected to a piston which divides an internal space formed by the cantilever tube into a first and second region, the first region formed on a side of the piston opposite the threaded nut and the second region formed on a side of the piston facing the threaded nut such that the first and second regions are separated from one another in a fluidically sealed manner,
wherein the first region of the internal space of the cantilever tube is connected to a first pressure source in the form of a pressure accumulator, and configured to generate a certain relief pressure in the first region using the first pressure source, and
wherein the threaded nut or components adjacent thereto is/are designed as fluidically sealed annular pistons, or the threaded nut comprises a fluidically sealed annular piston which separates an annular fluid space formed between a housing of the linear actuator and the cantilever tube in a fluidically sealed manner.