# US 11,027,616 B2 · Vehicle driving device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,027,616 B2 - Document ID: US11027616B2 - Status: Granted - Kind: B2 - Application number: 16/645,176 - Filed: 2018-10-12 - Published: 2021-04-22 - Granted: 2021-06-08 - Earliest claimed: 2017-10-13 - Assignees: Aisin Aw Co., Ltd. - Applicants: Aisin Aw Co., Ltd. - Inventors: Daiki Suyama; Hiroaki Sanji; Mitsuhiro Ichioka; Yuki Kawaguchi - Web page: https://patentgrep.com/patent/US11027616B2 ## CPC - B60L 15/20: for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed - 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) - F16H 1/46: Systems consisting of a plurality of gear trains each with orbital gears, {i.e. systems having three or more central gears} - F16H 57/037: Gearboxes for accommodating differential gearings (rotating cases for differential gearings F16H48/40) - B60K 2001/001: {one motor mounted on a propulsion axle for rotating right and left wheels of this axle} - B60Y 2400/73: Planetary gearings - F16H 2057/02034: {Gearboxes combined or connected with electric machines} - F16H 2057/02052: {Axle units; Transfer casings for four wheel drive} - Y02T 10/72: Electric energy management in electromobility - 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 - 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 - F16H: GEARING - B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A vehicle driving device including: a rotary electric machine that is a driving force source of a first wheel and a second wheel; a speed reduction device that reduces a speed of a rotation of the rotary electric machine; and a differential gear device that distributes to the first wheel and the second wheel, a driving force that is transmitted from the rotary electric machine via the speed reduction device. ## Claims ### Claim 1 A vehicle driving device comprising: a rotary electric machine that is a driving force source of a first wheel and a second wheel; a speed reduction device that reduces a speed of a rotation of the rotary electric machine; and a differential gear device that distributes to the first wheel and the second wheel, a driving force that is transmitted from the rotary electric machine via the speed reduction device, wherein the speed reduction device and the differential gear device are disposed coaxially with the rotary electric machine, the speed reduction device has a first planetary gear mechanism and a second planetary gear mechanism, the first planetary gear mechanism is disposed on a rotary electric machine side relative to the second planetary gear mechanism in an order of a power transmission path, and the first planetary gear mechanism is disposed on the rotary electric machine side relative to the second planetary gear mechanism along an axial direction, a helix angle of a helical tooth of the first planetary gear mechanism and a helix angle of a helical tooth of the second planetary gear mechanism are formed so that a thrust force of the first planetary gear mechanism and a thrust force of the second planetary gear mechanism are in mutually opposite directions in the axial direction, and the helix angle of the helical tooth of the first planetary gear mechanism is larger than the helix angle of the helical tooth of the second planetary gear mechanism. ### Claim 2 (depends on 1) The vehicle driving device according to claim 1, wherein thrust forces of the first planetary gear mechanism and the second planetary gear mechanism, the thrust forces facing each other, are transmitted via a transmitting member disposed between the first planetary gear mechanism and the second planetary gear mechanism in the axial direction. ### Claim 3 (depends on 2) The vehicle driving device according to claim 2, wherein the helix angle of the helical tooth of the first planetary gear mechanism and the helix angle of the helical tooth of the second planetary gear mechanism are formed so that the thrust forces that are transmitted via the transmitting member face each other in the axial direction when a driving force in a forward direction of the rotary electric machine is transmitted to the first wheel and the second wheel. ### Claim 4 (depends on 3) The vehicle driving device according to claim 3, wherein the first planetary gear mechanism and the second planetary gear mechanism each have a sun gear, a carrier, and a ring gear, and in both the first planetary gear mechanism and the second planetary gear mechanism, one of the sun gear and the ring gear is a rotatable element that is configured to rotate and the other is a fixed element that is stationary, and helix angles of helical teeth of the rotatable elements are formed so as to be in mutually opposite directions in the axial direction. ### Claim 5 (depends on 4) The vehicle driving device according to claim 4, wherein the first planetary gear mechanism has a first sun gear that is drivingly coupled to the rotary electric machine, a first carrier, and a first ring gear that is coupled to a fixing member so that the first ring gear is stationary, the second planetary gear mechanism has a second sun gear that is drivingly coupled to the first carrier, a second carrier, and a second ring gear that is coupled to a fixing member so that the second ring gear is stationary, and a helix angle of a helical tooth of the first sun gear and a helix angle of a helical tooth of the second sun gear are formed so as to be in mutually opposite directions in the axial direction. ### Claim 6 (depends on 5) The vehicle driving device according to claim 5, wherein a thrust bearing is disposed between the first sun gear and the second sun gear in the axial direction. ### Claim 7 (depends on 6) The vehicle driving device according to claim 6, further comprising a case that houses the rotary electric machine, the speed reduction device, and the differential gear device, wherein the case has a target disposed on an opposite side of the first planetary gear mechanism from a side on which the second planetary gear mechanism is disposed in the axial direction, the first planetary gear mechanism has a first sun gear that is drivingly coupled to the rotary electric machine, and a thrust bearing is disposed between the first sun gear and the target in the axial direction. ### Claim 8 (depends on 7) The vehicle driving device according to claim 7, wherein the speed reduction device is disposed between the rotary electric machine and the differential gear device in the axial direction. ### Claim 9 (depends on 8) The vehicle driving device according to claim 8, wherein a first gear width that is a width of a gear of the first planetary gear mechanism along the axial direction is smaller than a second gear width that is a width of a gear of the second planetary gear mechanism along the axial direction. ### Claim 10 (depends on 9) The vehicle driving device according to claim 9, wherein the second gear width is smaller than a length obtained by multiplying the first gear width by a speed reduction ratio of the first planetary gear mechanism. ### Claim 11 (depends on 2) The vehicle driving device according to claim 2, wherein the first planetary gear mechanism and the second planetary gear mechanism each have a sun gear, a carrier, and a ring gear, and in both the first planetary gear mechanism and the second planetary gear mechanism, one of the sun gear and the ring gear is a rotatable element that is configured to rotate and the other is a fixed element that is stationary, and helix angles of helical teeth of the rotatable elements are formed so as to be in mutually opposite directions in the axial direction. ### Claim 12 (depends on 2) The vehicle driving device according to claim 2, wherein the first planetary gear mechanism has a first sun gear that is drivingly coupled to the rotary electric machine, a first carrier, and a first ring gear that is coupled to a fixing member so that the first ring gear is stationary, the second planetary gear mechanism has a second sun gear that is drivingly coupled to the first carrier, a second carrier, and a second ring gear that is coupled to a fixing member so that the second ring gear is stationary, and a helix angle of a helical tooth of the first sun gear and a helix angle of a helical tooth of the second sun gear are formed so as to be in mutually opposite directions in the axial direction. ### Claim 13 (depends on 2) The vehicle driving device according to claim 2, further comprising a case that houses the rotary electric machine, the speed reduction device, and the differential gear device, wherein the case has a target disposed on an opposite side of the first planetary gear mechanism from a side on which the second planetary gear mechanism is disposed in the axial direction, the first planetary gear mechanism has a first sun gear that is drivingly coupled to the rotary electric machine, and a thrust bearing is disposed between the first sun gear and the target in the axial direction. ### Claim 14 (depends on 1) The vehicle driving device according to claim 1, wherein the first planetary gear mechanism and the second planetary gear mechanism each have a sun gear, a carrier, and a ring gear, and in both the first planetary gear mechanism and the second planetary gear mechanism, one of the sun gear and the ring gear is a rotatable element that is configured to rotate and the other is a fixed element that is stationary, and helix angles of helical teeth of the rotatable elements are formed so as to be in mutually opposite directions in the axial direction. ### Claim 15 (depends on 1) The vehicle driving device according to claim 1, wherein the first planetary gear mechanism has a first sun gear that is drivingly coupled to the rotary electric machine, a first carrier, and a first ring gear that is coupled to a fixing member so that the first ring gear is stationary, the second planetary gear mechanism has a second sun gear that is drivingly coupled to the first carrier, a second carrier, and a second ring gear that is coupled to a fixing member so that the second ring gear is stationary, and a helix angle of a helical tooth of the first sun gear and a helix angle of a helical tooth of the second sun gear are formed so as to be in mutually opposite directions in the axial direction. ### Claim 16 (depends on 15) The vehicle driving device according to claim 15, wherein a thrust bearing is disposed between the first sun gear and the second sun gear in the axial direction. ### Claim 17 (depends on 1) The vehicle driving device according to claim 1, further comprising a case that houses the rotary electric machine, the speed reduction device, and the differential gear device, wherein the case has a target disposed on an opposite side of the first planetary gear mechanism from a side on which the second planetary gear mechanism is disposed in the axial direction, the first planetary gear mechanism has a first sun gear that is drivingly coupled to the rotary electric machine, and a thrust bearing is disposed between the first sun gear and the target in the axial direction. ### Claim 18 (depends on 1) The vehicle driving device according to claim 1, wherein the speed reduction device is disposed between the rotary electric machine and the differential gear device in the axial direction. ### Claim 19 (depends on 1) The vehicle driving device according to claim 1, wherein a first gear width that is a width of a gear of the first planetary gear mechanism along the axial direction is smaller than a second gear width that is a width of a gear of the second planetary gear mechanism along the axial direction. ### Claim 20 (depends on 19) The vehicle driving device according to claim 19, wherein the second gear width is smaller than a length obtained by multiplying the first gear width by a speed reduction ratio of the first planetary gear mechanism.