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Patent · US9651120B2 · B2 · US

Multi-mode electromechanical variable transmission

(11) Publication number
US9651120B2
(21) Application number
14/624,285
(22) Filing date
2015-02-17
(30) Priority date
2015-02-17
(43) Publication date
2017-05-16
(45) Date of grant
2017-05-16
(51) IPC
B60K 6/442; F16H 3/72; B60K 6/365; B60K 6/387; B60K 6/445
(52) CPC
  • F16H Gearing: 3/727, 2037/0866, 2037/0873, 2200/20, 2200/2002, 2200/2007, 2200/203, 2200/2043, 3/728, 37/02, 37/084
  • 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: 2006/268, 2006/381, 6/365, 6/387, 6/442, 6/445
  • Y02T Climate change mitigation technologies related to transportation: 10/62, 10/6239
  • Y10S Technical subjects covered by former uspc cross-reference art collections [xracs] and digests: 903/917
(73) Assignee
Oshkosh Corp
(72) Inventors
Jon J. Morrow; Andrew J. Kotloski; David J. Steinberger; Eric E. Braun
(54) Title
Multi-mode electromechanical variable transmission
(57) Abstract

A drive system includes a first gear set and a second gear set, each including a sun gear, a ring gear, a plurality of planetary gears coupling the sun gear to the ring gear, and a carrier rotationally supporting the plurality of planetary gears, a first electrical machine coupled to the first gear set, a second electrical machine coupled to the second gear set, a connecting shaft coupling an engine to the first gear set, a driveshaft configured to transport power from the first electrical machine, the second electrical machine, and the engine to a tractive element of the vehicle, and a clutch selectively rotationally coupling the first carrier and the second carrier to the driveshaft when engaged.

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Claims (16)

  1. A drive system for a vehicle, comprising: a first gear set including a first sun gear, a first ring gear, a first plurality of planetary gears coupling the first sun gear to the first ring gear, and a first carrier rotationally supporting the first plurality of planetary gears; a second gear set including a second sun gear, a second ring gear, a second plurality of planetary gears coupling the second sun gear to the second ring gear, and a second carrier rotationally supporting the second plurality of planetary gears, wherein the first carrier is directly coupled to the second carrier; a first electrical machine directly coupled to the first sun gear of the first gear set; a second electrical machine directly coupled to the second sun gear of the second gear set; a connecting shaft directly coupling an engine to the first ring gear of the first gear set; a driveshaft configured to transport power from the first electrical machine, the second electrical machine, and the engine to a tractive element of the vehicle; and a clutch selectively rotationally coupling the first carrier and the second carrier to the driveshaft when engaged, wherein the drive system is selectively reconfigurable into a neutral startup mode whereby rotation of the first electrical machine rotates the connecting shaft to start the engine.
  2. The drive system of claim 1, further comprising a second clutch selectively rotationally coupling the connecting shaft to the second electrical machine when engaged.
  3. The drive system of claim 2, wherein the drive system is selectively reconfigurable into a power generation mode whereby a brake and the second clutch are engaged such that rotation of the connecting shaft rotates the first electrical machine and the second electrical machine to generate electrical power.
  4. The drive system of claim 3, further comprising a third clutch selectively rotationally coupling the second gear set to the driveshaft when engaged, wherein the drive system is selectively reconfigurable into a series electric mode whereby the brake and the third clutch are engaged such that rotation of the first electrical machine generates electricity that powers the second electrical machine to provide a mechanical output to the driveshaft.
  5. The drive system of claim 4, further comprising a second brake positioned to selectively limit a rotational movement of the second ring gear.
  6. A drive system for a vehicle, comprising: a first planetary gear set; a second planetary gear set directly coupled to the first planetary gear set; an engine directly coupled to the first planetary gear set with a connecting shaft, wherein the first planetary gear set, the second planetary gear set, and the connecting shaft are radially aligned; a first electromagnetic device coupled to the first planetary gear set, wherein the first electromagnetic device includes a first shaft; a second electromagnetic device directly coupled to the second planetary gear set and selectively rotationally engaged with the engine, wherein the second electromagnetic device includes a second shaft, wherein the first shaft and the second shaft are radially aligned with the first planetary gear set, the second pplanetary gear set, and the connecting shaft, and wherein the connecting shaft extends through the second electromagnetic device and through the second planetary gear set to the first planetary gear set; and an output selectively coupled to the first planetary gear set and the second planetary gear set, wherein the output is radially offset from the first planetary gear set, the second planetary gear set, and the connecting shaft.
  7. The drive system of claim 6, wherein the first planetary gear set and the second planetary gear set are disposed between the first electromagnetic device and the second electromagnetic device.
  8. The drive system of claim 6, further comprising a brake positioned to selectively limit a rotational movement of the first planetary gear set when engaged, wherein the drive system is selectively reconfigurable into a neutral startup mode whereby the brake is engaged such that rotation of the first electromagnetic device rotates the connecting shaft to start the engine.
  9. The drive system of claim 8, wherein the drive system is selectively reconfigurable into a power generation mode whereby the brake is engaged and the second electromagnetic device is rotationally engaged with the engine such that rotation of the connecting shaft rotates the first electromagnetic device and the second electromagnetic device to generate electrical power.
  10. The drive system of claim 9, wherein the drive system is selectively reconfigurable into a series electric mode whereby the brake is engaged and the output is coupled to the second planetary gear set such that rotation of the first electromagnetic device generates electricity that powers the second electromagnetic device to provide a mechanical power to the output.
  11. A vehicle, comprising: a multi-mode transmission including: a first gear set having a first planetary gear carrier and a second gear set having a second planetary gear carrier, wherein the first planetary gear carrier and the second planetary gear carrier are rotatably coupled; a first motor/generator coupled to the first gear set; and a second motor/generator coupled to the second gear set; an engine selectively coupled to the second gear set; and a drive axle selectively coupled to the multi-mode transmission; wherein during a power generation mode of the multi-mode transmission the engine is coupled to the second motor/generator and isolated from the drive axle, and wherein during a series electric mode of the multi-mode transmission the engine is decoupled from the second motor/generator, the second motor/generator is selectively coupled to the drive axle, and the engine is coupled to the first motor/generator such that rotation of the first motor/generator by the engine generates electricity to power the second motor/generator.
  12. The vehicle of claim 11, further comprising a first clutch positioned to selectively couple the first planetary gear carrier and the second planetary gear carrier to the drive axle.
  13. The vehicle of claim 12, further comprising a brake positioned to selectively limit movement of the first planetary gear carrier and the second planetary gear carrier when engaged.
  14. The vehicle of claim 13, wherein the engine is coupled to the first gear set with a connecting shaft, and wherein during a neutral startup mode the brake is engaged such that rotation of the first motor/generator rotates the connecting shaft to start the engine.
  15. The vehicle of claim 14, further comprising a second brake positioned to selectively limit movement of a ring gear of the second gear set.
  16. The vehicle of claim 15, further comprising a second clutch positioned to selectively couple the second motor/generator to the engine and a third clutch positioned to selectively couple the second gear set to the drive axle, wherein during a low range mode of the multi-mode transmission the first clutch and the third clutch are engaged, wherein during a mid range mode of the multi-mode transmission the first clutch and the second brake are engaged, and wherein during a high range mode of operation the first clutch and the second clutch are engaged.

Description

Internal combustion engine vehicles, hybrid vehicles, and electric vehicles, among other types of vehicles, include transmissions. Traditional vehicle transmissions use gears and gear trains to provide speed and torque conversions from a rotating power source (e.g., an engine, a motor, etc.) to another device (e.g., a drive shaft, wheels of a vehicle, etc.). Transmissions include multiple gear ratios selectively coupled to the rotating power source with a mechanism that may also selectively couple an output to the various gear ratios.

One exemplary embodiment relates to a drive system for a vehicle. The drive system includes a first gear set having a first sun gear, a first ring gear, a first plurality of planetary gears coupling the first sun gear to the first ring gear, and a first carrier rotationally supporting the first plurality of planetary gears; and a second gear set having a second sun gear, a second ring gear, a second plurality of planetary gears coupling the second sun gear to the second ring gear, and a second carrier rotationally supporting the second plurality of planetary gears. The first carrier is directly coupled to the second carrier.

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Record as JSON
{
  "publication_number": "US9651120B2",
  "country": "US",
  "kind": "B2",
  "title": "Multi-mode electromechanical variable transmission",
  "abstract": "A drive system includes a first gear set and a second gear set, each including a sun gear, a ring gear, a plurality of planetary gears coupling the sun gear to the ring gear, and a carrier rotationally supporting the plurality of planetary gears, a first electrical machine coupled to the first gear set, a second electrical machine coupled to the second gear set, a connecting shaft coupling an engine to the first gear set, a driveshaft configured to transport power from the first electrical machine, the second electrical machine, and the engine to a tractive element of the vehicle, and a clutch selectively rotationally coupling the first carrier and the second carrier to the driveshaft when engaged.",
  "claims": [
    "1. A drive system for a vehicle, comprising: a first gear set including a first sun gear, a first ring gear, a first plurality of planetary gears coupling the first sun gear to the first ring gear, and a first carrier rotationally supporting the first plurality of planetary gears; a second gear set including a second sun gear, a second ring gear, a second plurality of planetary gears coupling the second sun gear to the second ring gear, and a second carrier rotationally supporting the second plurality of planetary gears, wherein the first carrier is directly coupled to the second carrier; a first electrical machine directly coupled to the first sun gear of the first gear set; a second electrical machine directly coupled to the second sun gear of the second gear set; a connecting shaft directly coupling an engine to the first ring gear of the first gear set; a driveshaft configured to transport power from the first electrical machine, the second electrical machine, and the engine to a tractive element of the vehicle; and a clutch selectively rotationally coupling the first carrier and the second carrier to the driveshaft when engaged, wherein the drive system is selectively reconfigurable into a neutral startup mode whereby rotation of the first electrical machine rotates the connecting shaft to start the engine.",
    "2. The drive system of claim 1, further comprising a second clutch selectively rotationally coupling the connecting shaft to the second electrical machine when engaged.",
    "3. The drive system of claim 2, wherein the drive system is selectively reconfigurable into a power generation mode whereby a brake and the second clutch are engaged such that rotation of the connecting shaft rotates the first electrical machine and the second electrical machine to generate electrical power.",
    "4. The drive system of claim 3, further comprising a third clutch selectively rotationally coupling the second gear set to the driveshaft when engaged, wherein the drive system is selectively reconfigurable into a series electric mode whereby the brake and the third clutch are engaged such that rotation of the first electrical machine generates electricity that powers the second electrical machine to provide a mechanical output to the driveshaft.",
    "5. The drive system of claim 4, further comprising a second brake positioned to selectively limit a rotational movement of the second ring gear.",
    "6. A drive system for a vehicle, comprising: a first planetary gear set; a second planetary gear set directly coupled to the first planetary gear set; an engine directly coupled to the first planetary gear set with a connecting shaft, wherein the first planetary gear set, the second planetary gear set, and the connecting shaft are radially aligned; a first electromagnetic device coupled to the first planetary gear set, wherein the first electromagnetic device includes a first shaft; a second electromagnetic device directly coupled to the second planetary gear set and selectively rotationally engaged with the engine, wherein the second electromagnetic device includes a second shaft, wherein the first shaft and the second shaft are radially aligned with the first planetary gear set, the second pplanetary gear set, and the connecting shaft, and wherein the connecting shaft extends through the second electromagnetic device and through the second planetary gear set to the first planetary gear set; and an output selectively coupled to the first planetary gear set and the second planetary gear set, wherein the output is radially offset from the first planetary gear set, the second planetary gear set, and the connecting shaft.",
    "7. The drive system of claim 6, wherein the first planetary gear set and the second planetary gear set are disposed between the first electromagnetic device and the second electromagnetic device.",
    "8. The drive system of claim 6, further comprising a brake positioned to selectively limit a rotational movement of the first planetary gear set when engaged, wherein the drive system is selectively reconfigurable into a neutral startup mode whereby the brake is engaged such that rotation of the first electromagnetic device rotates the connecting shaft to start the engine.",
    "9. The drive system of claim 8, wherein the drive system is selectively reconfigurable into a power generation mode whereby the brake is engaged and the second electromagnetic device is rotationally engaged with the engine such that rotation of the connecting shaft rotates the first electromagnetic device and the second electromagnetic device to generate electrical power.",
    "10. The drive system of claim 9, wherein the drive system is selectively reconfigurable into a series electric mode whereby the brake is engaged and the output is coupled to the second planetary gear set such that rotation of the first electromagnetic device generates electricity that powers the second electromagnetic device to provide a mechanical power to the output.",
    "11. A vehicle, comprising: a multi-mode transmission including: a first gear set having a first planetary gear carrier and a second gear set having a second planetary gear carrier, wherein the first planetary gear carrier and the second planetary gear carrier are rotatably coupled; a first motor/generator coupled to the first gear set; and a second motor/generator coupled to the second gear set; an engine selectively coupled to the second gear set; and a drive axle selectively coupled to the multi-mode transmission; wherein during a power generation mode of the multi-mode transmission the engine is coupled to the second motor/generator and isolated from the drive axle, and wherein during a series electric mode of the multi-mode transmission the engine is decoupled from the second motor/generator, the second motor/generator is selectively coupled to the drive axle, and the engine is coupled to the first motor/generator such that rotation of the first motor/generator by the engine generates electricity to power the second motor/generator.",
    "12. The vehicle of claim 11, further comprising a first clutch positioned to selectively couple the first planetary gear carrier and the second planetary gear carrier to the drive axle.",
    "13. The vehicle of claim 12, further comprising a brake positioned to selectively limit movement of the first planetary gear carrier and the second planetary gear carrier when engaged.",
    "14. The vehicle of claim 13, wherein the engine is coupled to the first gear set with a connecting shaft, and wherein during a neutral startup mode the brake is engaged such that rotation of the first motor/generator rotates the connecting shaft to start the engine.",
    "15. The vehicle of claim 14, further comprising a second brake positioned to selectively limit movement of a ring gear of the second gear set.",
    "16. The vehicle of claim 15, further comprising a second clutch positioned to selectively couple the second motor/generator to the engine and a third clutch positioned to selectively couple the second gear set to the drive axle, wherein during a low range mode of the multi-mode transmission the first clutch and the third clutch are engaged, wherein during a mid range mode of the multi-mode transmission the first clutch and the second brake are engaged, and wherein during a high range mode of operation the first clutch and the second clutch are engaged."
  ],
  "description_excerpt": "Internal combustion engine vehicles, hybrid vehicles, and electric vehicles, among other types of vehicles, include transmissions. Traditional vehicle transmissions use gears and gear trains to provide speed and torque conversions from a rotating power source (e.g., an engine, a motor, etc.) to another device (e.g., a drive shaft, wheels of a vehicle, etc.). Transmissions include multiple gear ratios selectively coupled to the rotating power source with a mechanism that may also selectively couple an output to the various gear ratios.\n\nOne exemplary embodiment relates to a drive system for a vehicle. The drive system includes a first gear set having a first sun gear, a first ring gear, a first plurality of planetary gears coupling the first sun gear to the first ring gear, and a first carrier rotationally supporting the first plurality of planetary gears; and a second gear set having a second sun gear, a second ring gear, a second plurality of planetary gears coupling the second sun gear to the second ring gear, and a second carrier rotationally supporting the second plurality of planetary gears. The first carrier is directly coupled to the second carrier.",
  "cpc": [
    "F16H 3/727",
    "B60K 2006/268",
    "B60K 2006/381",
    "B60K 6/365",
    "B60K 6/387",
    "B60K 6/442",
    "B60K 6/445",
    "F16H 2037/0866",
    "F16H 2037/0873",
    "F16H 2200/20",
    "F16H 2200/2002",
    "F16H 2200/2007",
    "F16H 2200/203",
    "F16H 2200/2043",
    "F16H 3/728",
    "F16H 37/02",
    "F16H 37/084",
    "Y02T 10/62",
    "Y02T 10/6239",
    "Y10S 903/917"
  ],
  "ipc": [
    "B60K 6/442",
    "F16H 3/72",
    "B60K 6/365",
    "B60K 6/387",
    "B60K 6/445"
  ],
  "assignees": [
    "Oshkosh Corp"
  ],
  "inventors": [
    "Jon J. Morrow",
    "Andrew J. Kotloski",
    "David J. Steinberger",
    "Eric E. Braun"
  ],
  "filing_date": "2015-02-17",
  "publication_date": "2017-05-16",
  "grant_date": "2017-05-16",
  "priority_date": "2015-02-17",
  "application_number": "US-201514624285-A",
  "family_id": "54252377",
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}

Record 4,115 of 8,000 in Patents full text (MLC-0201). Request the full dataset.