Electromechanical actuator and rear-axle steering system
AssigneeSchaeffler Technologies AG & Co. KG
InventorsBenjamin Wuebbolt-Gorbatenko, Daniel Faber, Alexander Hausmann
Life of this patent
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Abstract
An actuator for rear-axle steering system of a motor vehicle comprises a threaded spindle (2) which is surrounded by planets (21), each provided with a corresponding profiling (8), wherein the planets (21) are guided in a driven cage (13) and, via further profiling (25), contact a nut (4) that surrounds areas of the planets (21) provided with said profiling (8) and is supported with respect to the cage (13) by rolling bearings (14), and wherein the cage (13) is mounted in a housing (20) by means of further rolling bearings (30, 31, 32, 33) and is non-rotatably connected to an output-side component (12, 34) of a further transmission (10, 11, 12).
Claims19
An electromechanical actuator, comprising:
- a threaded spindle having a central axis;
- a plurality of planets guided in a driven cage, the plurality of planets having:
- a first profiling configured to engage the threaded spindle;
- a second profiling configured to contact a nut surrounding the plurality of planets;
- and
- the nut is supported with respect to the driven cage via roller bearings, each roller bearing having:
- a first angled outer bearing washer arranged at an angle relative to the central axis, the first angled outer bearing washer received by a tapered surface of the driven cage;
- a second angled inner bearing washer arranged at an angle relative to the central axis, the second angled inner bearing washer received by a tapered surface of the nut;
- and
- rollers arranged between the first angled outer bearing washer and the second angled inner bearing washer;
- and
- the driven cage is non-rotatably connected to an output-side component of a transmission.
An electromechanical actuator, comprising:
- a first transmission stage configured to provide a rotary input to a second transmission stage, the second transmission stage comprising:
- a threaded spindle;
- a cage comprising:
- a cylindrical sleeve;
- and
- a first annular frontal cage element arranged at a first end of the cylindrical sleeve and a second annular frontal cage element arranged at a second end of the cylindrical sleeve, the first annular frontal cage element and the second annular frontal cage element having a plurality of radially outwardly extending arms forming a form-fitting connection with the cylindrical sleeve;
- a nut:
- i) disposed within the cylindrical sleeve, ii) supported for rotation with respect to the cage by roller bearings, and iii) having internal annular grooves;
- and
- a plurality of stepped planets supported for rotation with respect to the cage, each planet having a first profiling corresponding to the spindle threads and a second profiling corresponding to the internal annular grooves.
An electromechanical actuator, comprising:
- a threaded spindle;
- a housing;
- a cage supported for rotation with respect to the housing by first roller bearings, the cage comprising
- a first outer cage part aligned with a second outer cage part via a snap ring, and the second outer cage part is disposed within the first outer cage part;
- and
- a nut supported for rotation with respect to the cage by second roller bearings, the nut having internal annular grooves;
- and
- a plurality of stepped planets supported for rotation with respect to the cage, each planet of the plurality of stepped planets having:
- a first profiling corresponding to the spindle threads;
- a second profiling corresponding to the internal annular grooves;
- a first axial end having a first pin arranged within a first receptacle of the first outer cage part;
- a second axial end having a second pin arranged within a second receptacle of the second outer cage part;
- a first tubular flange molded onto the first outer cage part, the first tubular flange arranged longitudinally outside of the plurality of stepped planets such that the first tubular flange extends adjacently to the threaded spindle and away from the first receptacle in a first axial direction;
- and
- a second tubular flange molded onto the second outer cage part, the second tubular flange arranged longitudinally outside of the plurality of stepped planets such that the first tubular flange extends adjacently to the threaded spindle and away from the second receptacle in a second axial direction.
Dependencies are inferred from the claim text.