# US 12,006,985 B2 · Part having a rotationally symmetric region and a machining surface, gear motor, and method for manufacturing the part from a blank > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,006,985 B2 - Document ID: US12006985B2 - Status: Granted - Kind: B2 - Application number: 17/254,463 - Filed: 2019-05-28 - Published: 2021-04-22 - Granted: 2024-06-11 - Earliest claimed: 2018-06-22 - Assignees: Sew-Eurodrive GmbH & Co. KG - Applicants: Sew-Eurodrive GmbH & Co. KG - Inventors: Wolfgang Brand; Tobias Rück - Web page: https://patentgrep.com/patent/US12006985B2 ## CPC - F16D 1/108: having retaining means rotating with the coupling and acting by interengaging parts, i.e. positive coupling - F16D 3/68: the elements being made of rubber or similar material - F16D 1/116: the interengaging parts including a continuous or interrupted circumferential groove in the surface of one of the coupling parts (circlips for retaining hubs on shafts F16B21/18) - F16D 3/50: with the coupling parts connected by one or more intermediate members (F16D3/16 takes precedence) - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES ## Abstract In a part having a rotationally symmetric region and a machining surface, and a method for manufacturing the part from a blank, the machining surface is finished in a planar manner. The normal direction of the machining surface is oriented parallelly to the axis of symmetry, e.g., an axis of rotation, of the rotationally symmetric region. The part includes an annular groove that extends around in a circumferential direction, e.g., with respect to the axis of symmetry. In a circumferential angular region covered by the machining surface, the annular groove is incomplete, e.g., removed down to the groove base of the annular groove, and in a circumferential angular region not covered by the machining surface, the annular groove is complete, e.g., the machining surface bordering on the annular groove and/or leading into the annular groove. ## Claims ### Claim 1 A part, comprising: a rotationally symmetric region; a machining surface finished in a planar manner, a normal direction of the machining surface being oriented parallel to an axis of rotational symmetry of the rotationally symmetric region; and an annular recess that extends entirely around the part in a circumferential direction and arranged in an axial location of the part that coincides with an axial location of the machining surface; wherein, in a circumferential angular region not covered by the machining surface, the annular recess is axially symmetric and arranged as a groove, and, in a circumferential angular region covered by the machining surface, the annular recess is axially asymmetric and arranged as one axial half of the groove. ### Claim 2 (depends on 1) The part according to claim 1, wherein the axis of rotational symmetry includes an axis of rotation. ### Claim 3 (depends on 1) The part according to claim 1, wherein the annular recess extends around in the circumferential direction with respect to the axis of rotational symmetry. ### Claim 4 (depends on 1) The part according to claim 1, wherein, in the circumferential region covered by the machining surface, the annular recess is removed down to a groove base of the annular groove. ### Claim 5 (depends on 1) The part according to claim 1, wherein the machining surface borders on the annular recess and/or leads into the annular recess. ### Claim 6 (depends on 1) The part according to claim 1, wherein the rotationally symmetric region includes a cylindrical section and/or a hollow cylindrical section. ### Claim 7 (depends on 1) The part according to claim 1, wherein the machining surface is situated at an axial position covered by the annular recess. ### Claim 8 (depends on 1) The part according to claim 1, wherein an axially projecting region is provided on the rotationally symmetric region, and a region of the annular recess is arranged between the rotationally symmetric region and the axially projecting region. ### Claim 9 (depends on 8) The part according to claim 8, wherein a radial distance region covered by the rotationally symmetric region is contained in and/or surrounded by a radial distance region covered by the axially projecting region. ### Claim 10 (depends on 8) The part according to claim 8, wherein the part is arranged as a claw coupling part, the axially projecting region includes a claw region, and the rotationally symmetric region includes a cylindrical and/or a hollow cylindrical region. ### Claim 11 (depends on 1) The part according to claim 1, wherein the part is formed of metal and/or of steel. ### Claim 12 (depends on 1) The part according to claim 1, wherein the part is a machined, milled, broached, slotted, and or drawn part. ### Claim 13 (depends on 1) A gear motor, comprising: the part recited in claim 1, wherein the annular recess is arranged as a centrifugal edge. ### Claim 14 (depends on 13) The gear motor according to claim 13, wherein the annular recess is adapted to spin off leaked oil spreading out along the part. ### Claim 15 (depends on 13) The gear motor according to claim 13, wherein the annular recess is adapted to spin off lubricating oil that leaks out of a gear box of the gear motor. ### Claim 16 (depends on 1) A method for manufacturing the part recited in claim 1 from a blank, comprising: introducing a circumferential annular recess on a radially outer surface of the blank; and subsequently, machining and/or milling a planar surface and/or a machining surface in the blank having a normal direction oriented parallelly to an axis of rotational symmetry of the blank and being arranged at an axial position covered by the annular recess. ### Claim 17 (depends on 16) The method according to claim 16, wherein the blank is produced rotationally symmetrically by lathing. ### Claim 18 (depends on 16) The method according to claim 16, wherein a ring axis of the annular recess is oriented coaxially to the axis of rotational symmetry of the blank. ### Claim 19 (depends on 1) The part according to claim 1, wherein in the circumferential angular region covered by the machining surface, the annular recess is arranged as a bevel. ### Claim 20 (depends on 19) The part according to claim 19, wherein in the circumferential angular region not covered by the machining surface, the groove is arranged as a pair of symmetric and abutting bevels. ### Claim 21 (depends on 1) The part according to claim 1, wherein in the circumferential angular region not covered by the machining surface, the groove is arranged as a pair of symmetric and abutting bevels.