# US 10,480,622 B2 · Two-speed transmission for electric vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,480,622 B2 - Document ID: US10480622B2 - Status: Granted - Kind: B2 - Application number: 15/834,483 - Filed: 2017-12-07 - Published: 2018-08-02 - Granted: 2019-11-19 - Earliest claimed: 2017-02-01 - Assignees: Neooto Co., Ltd. - Applicants: Neooto Co., Ltd. - Inventors: Sun Hyun Kim; Sun Beom Woo; Se Hoon Oh; Duk Soon Choi - Web page: https://patentgrep.com/patent/US10480622B2 ## CPC - F16H 3/62: Gearings having three or more central gears (F16H3/68 - F16H3/78 take precedence) - B60K 1/00: Arrangement or mounting of electrical propulsion units (B60K7/00 takes precedence; arrangement or mounting of plural diverse prime-movers for mutual or common propulsion B60K6/00) - B60K 7/0007: {the motor being electric} - B60K 17/046: {with planetary gearing having orbital motion} - B60K 17/16: of differential gearing - F16H 3/663: {with conveying rotary motion between axially spaced orbital gears, e.g. a stepped orbital gear or Ravigneaux} - F16H 63/3026: {comprising friction clutches or brakes (band brake actuating mechanisms F16H63/3003)} - B60K 2001/001: {one motor mounted on a propulsion axle for rotating right and left wheels of this axle} - B60K 2007/0061: {the motor axle being parallel to the wheel axle} - B60Y 2200/91: Electric vehicles - F16H 2200/0034: the gear ratios comprising two forward speeds - F16H 2200/2005: with one sets of orbital gears - F16H 2200/2035: with two engaging means - F16H: GEARING - 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 - B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY ## Abstract The present invention relates to a two-speed transmission and includes a first sun gear; a second sun gear; a plurality of first planetary gears which are engaged with the first sun gear to rotate or revolve along a circumferential direction of the first sun gear; a ring gear which includes an inner circumferential gear and an outer circumferential gear, the outer gear rotating by being engaged with an input gear which rotates by a driving device; a plurality of second planetary gears which are engaged with the inner circumferential gear and the second sun gear to rotate or revolve along a circumferential direction of the second sun gear; a carrier to which the first planetary gears and the second planetary gears are rotatably connected; and a brake part which selectively fixes the first sun gear and the second sun gear. ## Claims ### Claim 1 A two-speed transmission comprising: a first sun gear; a second sun gear; a plurality of first planetary gears which are engaged with the first sun gear to rotate or revolve along a circumferential direction of the first sun gear; a ring gear which includes an inner circumferential gear and an outer circumferential gear, the outer circumferential gear rotating by being engaged with an input gear which rotates by a driving device; a plurality of second planetary gears which are engaged with the inner circumferential gear and the second sun gear to rotate or revolve along a circumferential direction of the second sun gear; a carrier to which the first planetary gears and the second planetary gears are rotatably connected; and a brake part which selectively fixes the first sun gear and the second sun gear. ### Claim 2 (depends on 1) The two-speed transmission of claim 1, wherein the first sun gear and the second sun gear respectively comprise a first and a second elongation portion with a cylindrical shape, a diameter of the first elongation portion is greater than a diameter of the second elongation portion, and the second elongation portion is provided to be rotatable within the first elongation portion. ### Claim 3 (depends on 2) The two-speed transmission of claim 2, wherein the brake part comprises a first brake friction plate and a second brake friction plate which are respectively connected to the first elongation portion and the second elongation portion, and a first brake and a second brake which respectively fix the first brake friction plate and the second brake friction plate. ### Claim 4 (depends on 3) The two-speed transmission of claim 3, wherein a shift to a first shift speed is performed when the first brake operates so as to fix the first sun gear and the second brake is released so as to allow the second sun gear to idle. ### Claim 5 (depends on 3) The two-speed transmission of claim 3, wherein a shift to a second shift speed is performed when the first brake is released so as to allow the first sun gear to idle and the second brake operates to fix the second sun gear. ### Claim 6 (depends on 1) The two-speed transmission of claim 1, wherein each one of the first planetary pears and each one of the second planetary pears are connected to one another and rotate about a rotating axis provided by the carrier. ### Claim 7 (depends on 1) The two-speed transmission of claim 1, wherein the first planetary gears are not engaged with the inner circumferential gear but rotate in the same way with the second planetary gears in response to a rotation of the second planetary gears. ### Claim 8 (depends on 1) The two-speed transmission of claim 1, wherein the carrier comprises an output gear and the output gear is engaged with a driving gear. ### Claim 9 (depends on 1) The two-speed transmission of claim 1, wherein the carrier rotates together in response to a revolution of the first planetary gears or the second planetary gears so as to output a force.