# US 11,078,988 B2 · Transmission assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,078,988 B2 - Document ID: US11078988B2 - Status: Granted - Kind: B2 - Application number: 16/424,630 - Filed: 2019-05-29 - Published: 2019-12-19 - Granted: 2021-08-03 - Earliest claimed: 2018-06-13 - Assignees: Aktiebolaget Skf - Applicants: Aktiebolaget SKF - Inventors: Ingo Schulz - Web page: https://patentgrep.com/patent/US11078988B2 ## CPC - F16H 1/28: with gears having orbital motion - B25J 9/0051: {with kinematics chains of the type rotary-universal-universal or rotary-spherical-spherical, e.g. Delta type manipulators} - B25J 9/102: {Gears specially adapted therefor, e.g. reduction gears (gearings in general F16H)} - B60K 1/02: comprising more than one electric motor - B60K 7/0007: {the motor being electric} - B60K 17/08: of mechanical type - F16H 57/08: of gearings with members having orbital motion - F16H 57/082: {Planet carriers} - F16C 19/163: {with angular contact} - F16C 19/364: {with tapered rollers, i.e. rollers having essentially the shape of a truncated cone} - F16C 19/547: {with two angular contact rolling bearings} - F16C 19/548: {in O-arrangement} - F16H 2001/2881: {comprising two axially spaced central gears, i.e. ring or sun gear, engaged by at least one common orbital gear wherein one of the central gears is forming the output} - F16H 2001/289: {comprising two or more coaxial and identical sets of orbital gears, e.g. for distributing torque between the coaxial sets} - F16H: GEARING - B25J: MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES ({manipulators specially adapted for use in surgery A61B34/70; manipulators used in cleaning hollow articles B08B9/04}; manipulators associated with rolling mills B21B39/20; manipulators associated with forging machines B21J13/10; {manipulators associated with picking-up and placing mechanisms B23P19/007}; means for holding wheels or parts thereof B60B30/00; {vehicles with ground-engaging propulsion means, e.g. walking members B62D57/02, B62D57/032; devices for picking-up and depositing articles or materials between conveyors B65G47/90, B65G47/91; manipulators with gripping or holding means for transferring packages B65H67/065}; cranes B66C; {manipulators used in the protection or supervision of pipe-line installations F17D5/00; walking equipment adapted for nuclear steam-generators F22B37/006}; manipulators specially adapted for, or associated with, nuclear reactors G21C; {apparatus used for handling wafers during manufacture or treatment of semiconductor H10P72/50}) - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS ## Abstract A transmission assembly includes a sun gear including an outer set of gear teeth, a planet carrier disposed around the sun gear, and a ring gear surrounding the planet carrier and the sun gear and including an inner set of gear teeth. At least one double planet is attached to the planet carrier. The double planet includes a first set of gear teeth and a second set of gear teeth, the outer set of gear teeth of the sun gear meshes with the first set of gear teeth, and the second set of gear teeth meshes with the inner set of gear teeth of the ring gear. ## Claims ### Claim 1 A transmission assembly comprising: a sun gear including an outer set of gear teeth, a planet carrier disposed around the sun gear, a ring gear surrounding the planet carrier and the sun gear and including an inner set of gear teeth, and at least one double planet attached to the planet carrier, wherein the double planet includes a first set of gear teeth and a second set of gear teeth, wherein the outer set of gear teeth of the sun gear meshes with the first set of gear teeth, wherein the second set of gear teeth meshes with the inner set of gear teeth of the ring gear, and the transmission assembly further comprises two bearing assemblies rotatably supporting the sun gear with respect to the planet carrier, each bearing assembly being disposed on a separate axial side of the sun gear. ### Claim 2 (depends on 1) The transmission assembly according to claim 1, wherein a number of teeth of the first set of gear teeth is different from a number of teeth of the second set of gear teeth. ### Claim 3 (depends on 1) The transmission assembly according to claim 1, wherein a number of teeth of the first set of gear teeth is greater than a number of teeth of the second set of gear teeth. ### Claim 4 (depends on 1) The transmission assembly according to claim 1, wherein a number of teeth of the first set of gear teeth is smaller than a number of teeth of the second set of gear teeth. ### Claim 5 (depends on 1) The transmission assembly according to claim 1, including at least one first bearing assembly supporting the sun gear with respect to the planet carrier. ### Claim 6 (depends on 5) The transmission assembly according to claim 5, including at least one second bearing assembly supporting the planet carrier with respect to the ring gear. ### Claim 7 (depends on 1) The transmission assembly according to claim 1, including at least one further double planet that includes a first set of gear teeth and a second set of gear teeth, wherein the at least one further double planet is attached to the planet carrier, wherein the outer set of gear teeth of the sun gear meshes with the first set of gear teeth of the at least one further double planet, and wherein the second set of gear teeth of the at least one further double planet meshes with the inner set of gear teeth of the ring gear. ### Claim 8 (depends on 7) The transmission assembly according to claim 7, wherein the first and the at least one further double planet are evenly distributed circumferentially. ### Claim 9 (depends on 1) The transmission assembly according to claim 1, wherein the planet carrier has a rotationally symmetric shape. ### Claim 10 (depends on 1) The transmission assembly according to claim 1, wherein the planet carrier has a ring shape. ### Claim 11 (depends on 1) A delta robot including the transmission assembly according to claim 1. ### Claim 12 (depends on 1) A motor vehicle motor including the transmission assembly according to claim 1. ### Claim 13 (depends on 1) The transmission assembly according to claim 1, wherein a number of teeth of the first set of gear teeth is different from a number of teeth of the second set of gear teeth, and including: at least one first bearing assembly supporting the sun gear with respect to the planet carrier and at least one second bearing assembly supporting the planet carrier with respect to the ring gear, and at least one further double planet that includes a first set of gear teeth and a second set of gear teeth, wherein the at least one further double planet is attached to the planet carrier, wherein the outer set of gear teeth of the sun gear meshes with the first set of gear teeth of the at least one further double planet, and wherein the second set of gear teeth of the at least one further double planet meshes with the inner set of gear teeth of the ring gear. ### Claim 14 (depends on 1) The transmission assembly according to claim 1, wherein the two bearing assemblies each include tapered rollers and are arranged facing the sun gear. ### Claim 15 A transmission assembly comprising: a sun gear including an outer set of gear teeth, a planet carrier disposed around the sun gear and including at least one hub, a ring gear surrounding the planet carrier and the sun gear and including an inner set of gear teeth, at least one double planet disposed on the hub of the planet carrier, and at least one support member disposed on the hub of the planet carrier, and wherein the double planet includes a first set of gear teeth and a second set of gear teeth, wherein the outer set of gear teeth of the sun gear meshes with the first set of gear teeth, wherein the second set of gear teeth meshes with the inner set of gear teeth of the ring gear, and wherein the transmission further comprises an inner bearing assembly supporting the sun gear with respect to the planet carrier and having an outer ring coupled with the support member and an outer bearing assembly supporting the planet carrier with respect to the ring gear and including an inner ring disposed about the support member. ### Claim 16 A transmission assembly comprising: a sun gear including an outer set of gear teeth, a planet carrier disposed around the sun gear, a ring gear surrounding the planet carrier and the sun gear and including an inner set of gear teeth, and at least one double planet attached to the planet carrier, wherein the double planet includes a first set of gear teeth and a second set of gear teeth, wherein the outer set of gear teeth of the sun gear meshes with the first set of gear teeth, wherein the second set of gear teeth meshes with the inner set of gear teeth of the ring gear, and wherein the transmission further comprises a bearing assembly supporting the planet carrier with respect to the ring gear and having an outer ring formed by the ring gear.