US 11,674,572 B2
Drive device for a movable tappet
Denis Draganov, Magdeburg (DE); and Oleksandr Tyshakin, Magdeburg (DE)
Assigned to OTTO-VON-GUERICKE-UNIVERSITAT MAGDEBURG, Magdeburg (DE)
Appl. No. 16/603,038
Filed by OTTO-VON-GUERICKE-UNIVERSITAT MAGDEBURG, Magdeburg (DE)
PCT Filed Oct. 12, 2017, PCT No. PCT/DE2017/100870
§ 371(c)(1), (2) Date Oct. 4, 2019,
PCT Pub. No. WO2018/192595, PCT Pub. Date Oct. 25, 2018.
Claims priority of application No. 202017102338.9 (DE), filed on Apr. 20, 2017.
Prior Publication US 2021/0054913 A1, Feb. 25, 2021
Int. Cl. H02K 7/06 (2006.01); F16H 25/20 (2006.01)
CPC F16H 25/2015 (2013.01) [H02K 7/06 (2013.01); F16H 2025/2078 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A drive device (1′) for generating a translational movement of a movable tappet (8) by means of an electromagnetic rotating machine, wherein the drive device (1′) is formed as an outer rotor type drive device, comprising:
a rotor (4); and
a stator (5) arranged coaxially to the rotor (4), the stator having at least one movement-thread pair integrated coaxially therein, comprising a lead screw (6), which is coupled in a rotationally fixed manner to the rotor (4), and a threaded nut (7) guided linearly in a stator sleeve (2) by anti-twist locking, the nut being rigidly coupled to the tappet (8),
spaced bearings seated between an outer surface of said stator sleeve (2) and an inner surface of the rotor (4) wherein the rotor (4) is guided in a rotational movement around an outer surface of the stator (5),
wherein the transfer of a torque from the rotor (4) to the lead screw (6) takes place by means of a flange (10) having a wall thickness T<0.1 D, wherein D equals a diameter of the flange (10), and
wherein an anti-twist lock (11) of the threaded nut (7) is provided in the recess of the stator sleeve (2) by a form-fitting interlocking of guide tabs (7′) provided on the threaded nut (7) with guide grooves (2′) provided in the stator sleeve (2),
the guide tabs (7′) being formed on a head of the threaded nut (7) which extends over an end of the tappet (8),
the threaded nut (7) having a usable travel path Vw which extends from an inner surface IF of the flange (10) to at least an outer surface AG of the drive device (1′).