# US 11,028,907 B2 · Power transmission apparatus for an electric vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,028,907 B2 - Document ID: US11028907B2 - Status: Granted - Kind: B2 - Application number: 16/701,847 - Filed: 2019-12-03 - Published: 2021-02-25 - Granted: 2021-06-08 - Earliest claimed: 2019-08-23 - Assignees: Hyundai Motor Company; Kia Motors Corporation - Applicants: Hyundai Motor Company; Kia Motors Corporation - Inventors: Jin Young Hwang; Jong Sool Park; Jong Soo Kim; Sang Bum Baek; Jin Ho Kim - Web page: https://patentgrep.com/patent/US11028907B2 ## CPC - F16H 3/663: {with conveying rotary motion between axially spaced orbital gears, e.g. a stepped orbital gear or Ravigneaux} - F16H 3/666: {with intermeshing orbital gears (F16H3/663 takes precedence)} - B60L 15/2054: {by controlling transmissions or clutches} - B60L 50/50: using propulsion power supplied by batteries or fuel cells - F16H 57/082: {Planet carriers} - B60Y 2200/91: Electric vehicles - F16H 2200/0021: specially adapted for electric vehicles - F16H 2200/0034: the gear ratios comprising two forward speeds - F16H 2200/2005: with one sets of orbital gears - F16H 2200/2023: using a Ravigneaux set with 4 connections - F16H 2200/2035: with two engaging means - Y02T 10/64: Electric machine technologies in electromobility - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - Y02T 10/72: Electric energy management in electromobility - F16H: GEARING - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A power transmission apparatus for an electric vehicle including a motor as a power source may include: a compound planetary gear set formed as a combination of first and second planetary gear sets sharing a sun gear and a plurality first pinion gears; a first brake selectively connecting a first ring gear of the first planetary gear set to a transmission housing; and a second brake selectively connecting the shared sun gear of the first and second planetary gear sets to the transmission housing. In particular, a second ring gear of the second planetary gear set is fixedly connected to a rotor of the motor and thus continuously receives a torque of the motor, and the power transmission apparatus outputs a shifted torque through a planet carrier rotatably supporting the plurality of first pinion gears and a plurality of second pinion gears of the first planetary gear set. ## Claims ### Claim 1 A power transmission apparatus for an electric vehicle including a motor as a power source, the power transmission apparatus comprising: a compound planetary gear set formed as a combination of first and second planetary gear sets sharing a sun gear and a plurality of first pinion gears; a first brake selectively connecting a first ring gear of the first planetary gear set to a transmission housing; and a second brake selectively connecting the shared sun gear of the first and second planetary gear sets to the transmission housing, wherein a second ring gear of the second planetary gear set is fixedly connected to a rotor of the motor and configured to continuously receive a torque of the motor, and wherein the power transmission apparatus outputs a shifted torque through a planet carrier rotatably supporting the plurality of first pinion gears and a plurality of second pinion gears of the first planetary gear set. ### Claim 2 (depends on 1) The power transmission apparatus of claim 1, wherein: the first planetary gear set is a double pinion planetary gear set including the shared sun gear and the plurality of first pinion gears shared with the second planetary gear set, a plurality of second pinion gears, and the first ring gear; and the second planetary gear set is a single pinion planetary gear set including the shared sun gear and the plurality of first pinion gears shared with the first planetary gear set, and the second ring gear. ### Claim 3 (depends on 2) The power transmission apparatus of claim 2, wherein: the plurality of first pinion gears are externally engaged with the shared sun gear; each of the plurality of second pinion gears is externally engaged with two adjacent first pinion gears among the plurality of first pinion gears; the planet carrier rotatably supports the plurality of first pinion gears and the plurality of second pinion gears; and the plurality of second pinion gears are internally engaged with the first ring gear. ### Claim 4 (depends on 3) The power transmission apparatus of claim 3, wherein the plurality of first pinion gears are internally engaged with the second ring gear of the second planetary gear set. ### Claim 5 (depends on 4) The power transmission apparatus of claim 4, wherein the plurality of first pinion gears are formed as three first pinion gears, and the plurality of second pinion gears are formed as three second pinion gears. ### Claim 6 (depends on 4) The power transmission apparatus of claim 4, wherein the plurality of first pinion gears are formed as four first pinion gears, and the plurality of second pinion gears are formed as four second pinion gears. ### Claim 7 (depends on 4) The power transmission apparatus of claim 4, wherein the plurality of first pinion gears are formed as five first pinion gears, and the plurality of second pinion gears are formed as five second pinion gears. ### Claim 8 (depends on 4) The power transmission apparatus of claim 4, wherein the plurality of first pinion gears are formed as six first pinion gears, and the plurality of second pinion gears are formed as six second pinion gears. ### Claim 9 (depends on 4) The power transmission apparatus of claim 4, wherein an exterior circumference of the second ring gear is fixedly connected to the rotor of the motor. ### Claim 10 (depends on 3) The power transmission apparatus of claim 3, wherein the planet carrier is fixedly connected to an output gear. ### Claim 11 A power transmission apparatus for an electric vehicle including a motor as a power source, the power transmission apparatus comprising: a first planetary gear set formed as a double pinion planetary gear set including a sun gear, a plurality of first pinion gears externally engaged with the sun gear, a plurality of second pinion gears externally engaged with the plurality of first pinion gears, each of the second pinion gears being externally engaged with two first pinion gears among the plurality of first pinion gears and disposed angularly both sides, a planet carrier rotatably supporting the plurality of first pinion gears and the plurality of second pinion gears, and a first ring gear internally engaged with the plurality of second pinion gears; a second planetary gear set formed as a single pinion planetary gear set including the sun gear shared with the first planetary gear set, the plurality of first pinion gears shared with the first planetary gear set, the planet carrier shared with the first planetary gear set, and a second ring gear internally engaged with the plurality of first pinion gears and fixedly connected to a rotor of the motor; a first brake selectively connecting a first ring gear of the first planetary gear set to a transmission housing; and a second brake selectively connecting the shared sun gear of the first and second planetary gear sets to the transmission housing, wherein the first and second planetary gear sets are combined to form a compound planetary gear set, and wherein the power transmission apparatus outputs a torque through the planet carrier. ### Claim 12 (depends on 11) The power transmission apparatus of claim 11, wherein the plurality of first pinion gears are formed as three first pinion gears, and the plurality of second pinion gears are formed as three second pinion gears. ### Claim 13 (depends on 11) The power transmission apparatus of claim 11, wherein the plurality of first pinion gears are formed as four first pinion gears, and the plurality of second pinion gears are formed as four second pinion gears. ### Claim 14 (depends on 11) The power transmission apparatus of claim 11, wherein the plurality of first pinion gears are formed as five first pinion gears, and the plurality of second pinion gears are formed as five second pinion gears. ### Claim 15 (depends on 11) The power transmission apparatus of claim 11, wherein the plurality of first pinion gears are formed as six first pinion gears, and the plurality of second pinion gears are formed as six second pinion gears. ### Claim 16 (depends on 11) The power transmission apparatus of claim 11, wherein an exterior circumference of the second ring gear is fixedly connected to the rotor of the motor. ### Claim 17 (depends on 11) The power transmission apparatus of claim 11, wherein the planet carrier is fixedly connected to an output gear.