Geared transmission unit

{
  "publication_number": "US10408317B2",
  "country": "US",
  "kind": "B2",
  "title": "Geared transmission unit",
  "abstract": "A geared transmission unit in which a range of a speed ratio is widened without increasing a size of the transmission unit. The geared transmission unit comprises: a first sun gear fixed to a stationary member; a second sun gear arranged coaxially with the first sun gear while being connected to the second shaft; a first pinion gear meshing with the first sun gear; a second pinion gear meshing with the first pinion gear; a third pinion gear rotated integrally with the second pinion gear; a fourth pinion gear meshing with the third pinion gear; a fifth pinion gear rotated integrally with the fourth pinion gear; and a carrier coupled to the first shaft while rotatably supporting the pinion gears.",
  "claims": [
    "1. A geared transmission unit that transmits torque between a first shaft and a second shaft while amplifying or reducing the torque, comprising: a first sun gear that is fixed to a predetermined stationary member; a second sun gear that is arranged coaxially with the first sun gear while being connected to the second shaft in a torque transmittable manner; a first pinion gear that meshes with the first sun gear; a second pinion gear that meshes with the first pinion gear; a third pinion gear that is arranged coaxially with the second pinion gear to be rotated integrally with the second pinion gear; a fourth pinion gear that meshes with the third pinion gear; a fifth pinion gear that is arranged coaxially with the fourth pinion gear to be rotated integrally with the fourth pinion gear while meshing with the second sun gear; and a carrier that supports the first pinion gear, the second pinion gear, the third pinion gear, the fourth pinion gear, and the fifth pinion gear in a rotatable manner, and that is coupled to the first shaft in a torque transmittable manner.",
    "2. The geared transmission unit as claimed in claim 1, further comprising: an external gear that is formed on the carrier; and a drive gear that meshes with the external gear, wherein the drive gear is coupled to the first shaft.",
    "3. The geared transmission unit as claimed in claim 1, wherein the first shaft includes an input shaft to which the torque is applied, and wherein the second shaft includes an output shaft that outputs the torque.",
    "4. The geared transmission unit as claimed in claim 2, wherein the first shaft includes an input shaft to which the torque is applied, and wherein the second shaft includes an output shaft that outputs the torque."
  ],
  "description_excerpt": "Embodiments of the present disclosure relate to the art of a geared transmission unit for transmitting power through a planetary gear set.\n\nAn example of this kind of transmission is described in JP-A-2010-60095. The planetary gear unit taught by JP-A-2010-60095 comprises two stepped pinion gears and a carrier that supports the stepped pinion gears in a rotatable manner and that is connected to a motor. The stepped pinion gears are arranged at equal intervals on the carrier, and each of the stepped pinion gears includes a fixed planetary gear and an output planetary gear. The output planetary gear is diametrically smaller than the fixed planetary gear, and size and number of teeth are different in those gears. The planetary gear unit taught by JP-A-2010-60095 further comprises a fixed gear fixed to a stationary member coaxially with a rotational center axis of the carrier, and an output gear coupled to an output shaft. The fixed gear is diametrically larger than the fixed planetary gear, and meshed with the fixed planetary gear. The output gear is diametrically larger than the output planetary gear, and meshed with the output planetary gear. When the carrier is rotated by a torque of the motor, the fixed planetary gear meshing with the fixed gear revolves around the fixed gear, and the output planetary gear meshing with the output gear revolves around the output gear. As a result, the torque of the motor is multiplied according to a gear ratio and outputted from the output shaft.",
  "cpc": [
    "F16H 37/065",
    "F16H 1/32",
    "F16H 2001/2881",
    "F16H 2001/324",
    "F16H 2037/047",
    "F16H 2057/02086",
    "F16H 3/724",
    "F16H 37/0813",
    "F16H 37/0826",
    "F16H 57/00"
  ],
  "ipc": [
    "F16H 37/06",
    "F16H 37/08",
    "F16H 3/72"
  ],
  "assignees": [
    "Toyota Motor Corp"
  ],
  "inventors": [
    "Hiroshi Isono"
  ],
  "filing_date": "2018-04-27",
  "publication_date": "2019-09-10",
  "grant_date": "2019-09-10",
  "priority_date": "2017-05-19",
  "application_number": "US-201815964649-A",
  "family_id": "64270564",
  "cited_by_count": 3,
  "citations": [
    "US6056660A",
    "US20050250614A1",
    "US20060247089A1",
    "US20090239702A1",
    "JP2010060095A",
    "US20150298682A1",
    "US20160327134A1",
    "US9664261B1"
  ]
}