US 11,852,237 B2
Electromechanical actuator for generating an axial actuating force
Matthias Reisch, Ravensburg (DE); Andreas Füßl, Kressbronn am Bodensee (DE); Jürgen Wafzig, Bermatingen (DE); Andreas Wendzel, Grünkraut (DE); Lorenz Fischer, Friedrichshafen (DE); Holger Gohmert, Grünkraut (DE); Uwe Fehr, Friedrichshafen (DE); and Michael Arnegger, Grünkraut (DE)
Assigned to ZF FRIEDRICHSHAFEN AG, Friedrichshafen (DE)
Appl. No. 17/613,336
Filed by ZF Friedrichshafen AG, Friedrichshafen (DE)
PCT Filed Mar. 6, 2020, PCT No. PCT/EP2020/055990
§ 371(c)(1), (2) Date Nov. 22, 2021,
PCT Pub. No. WO2020/233848, PCT Pub. Date Nov. 26, 2020.
Claims priority of application No. 10 2019 207 602.5 (DE), filed on May 23, 2019.
Prior Publication US 2022/0221052 A1, Jul. 14, 2022
Int. Cl. F16H 63/30 (2006.01); H02K 11/215 (2016.01); F16H 25/20 (2006.01); H02K 7/06 (2006.01)
CPC F16H 63/304 (2013.01) [F16H 25/20 (2013.01); H02K 7/06 (2013.01); H02K 11/215 (2016.01); F16H 2025/2075 (2013.01); F16H 2063/3063 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An electro-mechanical actuator (23) for generating an axial actuation force, comprising:
an electric machine (24) with a stator (1) and a rotor (2);
a spindle drive (5) with a rotary element (6/7) and a translatable element (7/6), the spindle drive (5) configured such that rotation of the rotary element (6/7) drives translation of the translatable element (7/6), the rotor (2) and the rotary element (6/7) of the spindle drive (5) being coupled to each other in a circumferential direction (U) such that rotation of the rotor (2) drives rotation of the rotary element (6/7) of the spindle drive (5), a rotational play (8) being formed between the rotor (2) and the rotary element (6/7) of the spindle drive (5) in the circumferential direction (U); and
a control unit (17), the control unit (17) being configured for:
driving the rotor (2) in a forward direction of rotation (U1);
resetting the rotor (2) by driving the rotor (2) in a reverse direction of rotation (U2) within the rotational play (8) when the rotor (2) is at a standstill due to an excessive counter-torque of the rotary element (6/7) of the spindle drive (5), the reverse direction of rotation (U2) being opposite the forward direction of rotation (U1); and
driving the rotor (2) in the forward direction of rotation (U1) once again after the rotor (2) has been reset in the reverse direction of rotation (U2) such that the rotor (2) turns freely with respect to the rotary element (6/7) of the spindle drive (5) in the forward direction of rotation (U1) within the rotational play (8) and drives the rotary element (6/7) with momentum upon engagement of a driving toothing (9).