# US 2014/0190293 A1 · Step Actuator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0190293 A1 - Document ID: US20140190293A1 - Status: Published application - Kind: A1 - Application number: 14/204,699 - Filed: 2014-03-11 - Published: 2014-07-10 - Earliest claimed: 2008-07-28 - Assignees: LG Innotek Co., Ltd. - Applicants: LG Innotek Co., Ltd. - Inventors: Hong Kon Lee - Web page: https://patentgrep.com/patent/US20140190293A1 ## CPC - H02K 5/16: Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields (magnetic bearings H02K7/09) - H02K 5/161: {radially supporting the rotary shaft at both ends of the rotor (H02K5/165, H02K5/167, H02K5/173 take precedence)} - F16C 35/042: {Housings for rolling element bearings for rotary movement} - H02K 7/003: {Couplings; Details of shafts (means for mounting rotors on shafts H02K1/28)} - H02K 7/06: Means for converting reciprocating motion into rotary motion or vice versa - H02K 37/24: Structural association with auxiliary mechanical devices - F16C 2380/26: Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators - F16H 2025/2031: {Actuator casings} - Y10T 74/18576: including screw and nut - Y10T 74/18664: Shaft moves through rotary drive means - Y10T 74/18688: Limit stop - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS - F16H: GEARING - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Disclosed is a step actuator. The step actuator includes a housing; a stator installed in the housing; a rotor positioned radially inward from the stator, the rotor rotating and protruding from one side of the housing; a bearing installed at one side of the housing so as to be coupled with the rotor; a bearing cover coupled with one side of the housing to restrain movement of the bearing; a screw member coupled with the rotor to linearly move according to rotation of the rotor; and a mounting member coupled to the bearing cover to support the screw member. ## Claims ### Claim 1 A step actuator comprising: a housing including a first housing and a second housing; a stator installed in the housing, wherein the stator includes a first bobbin, a second bobbin, a first yoke having a first tooth, and a second yoke having a second tooth installed between the first housing and the second housing; a rotor positioned radially inward from the stator, the rotor rotating and protruding from one side of the housing; a bearing installed at one side of the second housing; a bearing cover coupled with one side of the housing, wherein the bearing cover supports the bearing; a screw member coupled with the rotor; and a mounting member coupled to the bearing cover, wherein the first housing includes a third tooth protruding toward the second housing so as to be disposed between the first bobbin and the magnet by passing through a slit of the first bobbin, wherein the second housing includes a fourth tooth protruding toward the first housing so as to be disposed between the second bobbin and the magnet. ### Claim 2 (depends on 1) The step actuator as claimed in claim 1, wherein the screw member linearly moves in a first direction and a second direction that is opposite to the first direction. ### Claim 3 (depends on 2) The step actuator as claimed in claim 2, wherein movement of the bearing is restrained in the first direction by the one side of the housing. ### Claim 4 (depends on 2) The step actuator as claimed in claim 2, wherein movement of the bearing is restrained in the first direction by the bearing cover. ### Claim 5 (depends on 2) The step actuator as claimed in claim 2, wherein the bearing cover makes contact with the bearing from the second direction and a radially outward direction. ### Claim 6 (depends on 2) The step actuator as claimed in claim 2, wherein the one side of the housing is fixed to the bearing cover through a spot welding or a laser welding. ### Claim 7 (depends on 1) The step actuator as claimed in claim 1, wherein the mounting member restrains rotation of the screw member. ### Claim 8 (depends on 7) The step actuator as claimed in claim 7, wherein one side of the screw member has a D-shape section, and the mounting member is formed with a D-shape perforation hole. ### Claim 9 (depends on 1) The step actuator as claimed in claim 1, wherein the bearing cover includes a coupling rim having a ring shape and coupled to one side of the housing, a coupling pipe extending from the coupling rim, and a locking rim protruding radially inward from an end of the coupling pipe to make contact with an outer race of the bearing. ### Claim 10 (depends on 9) The step actuator as claimed in claim 9, wherein an inner peripheral surface of the coupling pipe makes contact with the outer race of the bearing. ### Claim 11 (depends on 9) The step actuator as claimed in claim 9, wherein the bearing cover further comprises a coupling section protruding radially inward from the coupling rim to make contact with the outer race of the bearing. ### Claim 12 A step actuator comprising: a housing; a stator installed in the housing; a rotor positioned radially inward from the stator, the rotor rotating and protruding from one side of the housing, wherein the rotor includes a magnet installed within the stator to rotate while interacting with the stator and a nut member coupled to the magnet, wherein a spline is provided at an outer peripheral surface of the nut member, wherein the spline extends in an axial direction and coupled with an spline hole formed in the magnet; a bearing installed at one side of the housing; a bearing cover coupled with one side of the housing, wherein the bearing cover supports the bearing; a screw member coupled with the nut member to linearly move in a first direction and a second direction, which is opposite to the first direction, according to rotation of the rotor; and a mounting member detachably coupled to the bearing cover. ### Claim 13 (depends on 12) The step actuator as claimed in claim 12, wherein the mounting member includes a receptacle pipe installed in the coupling pipe and a protrusion extending from the receptacle pipe in the second direction to support the screw member. ### Claim 14 (depends on 12) The step actuator as claimed in claim 12, wherein the bearing cover includes a coupling rim having a ring shape and coupled to one side of the housing, a coupling pipe extending from an inner peripheral surface of the coupling rim in the second direction, and a locking rim protruding radially inward from an end of the coupling pipe to make contact with an outer race of the bearing ### Claim 15 (depends on 14) The step actuator as claimed in claim 14, wherein the bearing cover includes a support member extending from an outer peripheral portion of the coupling rim in the second direction and a first contact member extending radially outward from the support member, and the mounting member includes an extension rim extending radially outward from an outer peripheral surface of the receptacle pipe, a locking member extending from the extension rim in the first direction, and a second contact member extending radially inward from an end of the locking member. ### Claim 16 (depends on 15) The step actuator as claimed in claim 15, wherein the second contact member restrains movement of the first contact member in the first direction. ### Claim 17 (depends on 15) The step actuator as claimed in claim 15, wherein the first contact member is formed with an embossing. ### Claim 18 (depends on 15) The step actuator as claimed in claim 15, wherein the bearing cover includes a stopper protrusion extending radially outward from the support member, and the locking member and the stopper protrusion are arranged in a same circumferential surface. ### Claim 19 (depends on 18) The step actuator as claimed in claim 18, further comprising a locking protrusion extending from the extension rim in a form of a cantilever and having elasticity, wherein the locking protrusion is spaced apart from the locking member to restrain movement of the stopper protrusion in a circumferential direction.