# US 11,121,616 B2 · Rotary-linear actuation assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,121,616 B2 - Document ID: US11121616B2 - Status: Granted - Kind: B2 - Application number: 16/493,067 - Filed: 2018-03-14 - Published: 2021-05-13 - Granted: 2021-09-14 - Earliest claimed: 2017-03-14 - Assignees: Arol S.P.A. - Applicants: Arol S.P.A. - Inventors: Marco Cipriani - Web page: https://patentgrep.com/patent/US11121616B2 ## CPC - H02K 41/031: {of the permanent magnet type} - H02K 1/2713: the magnetisation axis of the magnets being axial, e.g. claw-pole type - H02K 1/2726: the rotor consisting of a single magnet or two or more axially juxtaposed single magnets - H02K 16/04: Machines with one rotor and two stators - H02K 21/14: with magnets rotating within the armatures - H02K 2201/18: Machines moving with multiple degrees of freedom - H02K 2213/06: Machines characterised by the presence of fail safe, back up, redundant or other similar emergency arrangements - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract A rotary-linear actuation assembly is provided, in particular of a kind suitable to provide in independent manner at its output, either sequentially or simultaneously, a rotary movement and a linear translation movement. The assembly comprises a casing internally housing an output shaft arranged coaxial with an actuation axis (A) in a translationally and rotationally movable manner; and at least two electromagnetic actuators each comprising a respective electromagnetic stator and a respective magnetic rotor, a first of which being a linear actuator adapted to impart, at its output, a translational movement along the actuation axis (A), and a second of which being a rotary actuator adapted to impart, at its output, a rotary movement around the actuation axis (A). The electromagnetic stators of the electromagnetic actuators are arranged in a mutually coaxial and concentric manner, and each actuator independently acts on the output shaft. ## Claims ### Claim 1 A rotary-linear actuation assembly (10) comprising a casing (25) internally housing: an output shaft (13) arranged coaxial with an actuation axis (A) in a translationally and rotationally movable manner; and at least two electromagnetic actuators (11, 12) each comprising a respective electromagnetic stator (16, 15) and a respective magnetic rotor (18, 17), a first of which is a linear actuator (11) adapted to impart, at its output, a translational movement along the actuation axis (A), and a second of which is a rotary actuator (12) adapted to impart, at its output, a rotary movement around the actuation axis (A), wherein the electromagnetic stators (15, 16) of the electromagnetic actuators (11, 12) are arranged in a mutually coaxial and concentric manner, and each actuator (11, 12) independently acts on the output shaft (13), and wherein inside the casing (25), a central rod (14) extends coaxially with the output shaft (13) and partly inside the output shaft (13), a radially outermost electromagnetic stator (15, 16) out of the first (16) and the second (15) electromagnetic stator being integrally constrained inside the casing (25) and one radially innermost electromagnetic stator (16, 15) out of the first (16) and the second (15) electromagnetic stator being integrally constrained to the central rod (14). ### Claim 2 (depends on 1) The rotary-linear actuation assembly (10) according to claim 1, wherein the magnetic rotors (17, 18) have a larger axial size with respect to the axial size of the corresponding electromagnetic stators (15, 16) by an amount at least equal to a maximum translational movement imparted by the first linear actuator (11) along the actuation axis (A) between a first and a second stroke end position. ### Claim 3 (depends on 1) The rotary-linear actuation assembly (10) according to claim 1, wherein a first magnetic rotor (18) of the respective magnetic rotors associated with a first electromagnetic stator (16) of the respective electromagnetic stators comprises a plurality of coaxially arranged annular permanent magnets, with alternating polarities along an axial extension of the output shaft (13). ### Claim 4 (depends on 3) The rotary-linear actuation assembly (10) according to claim 3, wherein the annular permanent magnets are coaxially arranged, with alternating polarities along the axial extension of the output shaft (13), by the interposition of annular elements (18a) suitable to promote the generation of a radial magnetic field. ### Claim 5 (depends on 1) The rotary-linear actuation assembly (10) according to claim 1, wherein a second magnetic rotor (17) of the respective magnetic rotors associated with a second electromagnetic stator (15) of the respective electromagnetic stators comprises a plurality of permanent magnets with elongated shape, arranged parallel to the actuation axis (A), with alternating polarities along an axial extension of an outer jacket surface of the output shaft (13). ### Claim 6 (depends on 1) The rotary-linear actuation assembly (10) according to claim 1, wherein an innermost portion (13a) of the output shaft (13) inside the casing (25) is hollow and houses at its interior the central rod (14) and the radially innermost electromagnetic stator (16, 15) constrained to the same rod (14). ### Claim 7 (depends on 6) The rotary-linear actuation assembly (10) according to claim 6, wherein a radially innermost magnetic rotor (18, 17) out of the first (18) and the second (17) magnetic rotor, associated with the radially innermost electromagnetic stator (16, 15), is mounted on an inner jacket surface of the hollow portion (13a) of the output shaft (13), and a radially outermost magnetic rotor (17, 18) out of the first (18) and the second (17) magnetic rotor, associated with the radially outermost electromagnetic stator (15, 16), is mounted on an outer jacket surface of the hollow portion (13a) of the output shaft (13). ### Claim 8 (depends on 7) The rotary-linear actuation assembly (10) according to claim 7, wherein at least the inner jacket surface and/or at least the outer jacket surface of the hollow portion (13a) of the output shaft (13) is made of a ferromagnetic material. ### Claim 9 (depends on 6) The rotary-linear actuation assembly (10) according to claim 6, wherein at least an inner jacket surface and/or at least an outer jacket surface of the hollow portion (13a) of the output shaft (13) is made of a ferromagnetic material. ### Claim 10 (depends on 1) The rotary-linear actuation assembly (10) according to claim 1, wherein the output shaft (13) is guided inside the casing (25) by means of a guide element (19) adapted to allow both rotation and translation. ### Claim 11 (depends on 1) The rotary-linear actuation assembly (10) according to claim 1, wherein the electromagnetic stators (15, 16) have mutually different axial sizes. ### Claim 12 (depends on 1) The rotary-linear actuation assembly (10) according to claim 1, wherein the magnetic rotors (17, 18) have mutually different axial sizes. ### Claim 13 (depends on 1) The rotary-linear actuation assembly (10) according to claim 1, wherein the magnetic rotor of the second, rotary actuator has a larger axial size than the magnetic rotor of the first, linear actuator.