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Planetary gear train of automatic transmission for vehicle

  • US 10,281,009 B2
  • Filed: 08/21/2017
  • Issued: 05/07/2019
  • Est. Priority Date: 12/14/2016
  • Status: Active Grant
First Claim
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1. A planetary gear train of an automatic transmission for a vehicle, comprising:

  • a first planetary gear set having first, second, and third rotational elements;

    a second planetary gear set having fourth, fifth, and sixth rotational elements;

    a third planetary gear set having seventh, eighth, and ninth rotational elements;

    an input shaft mounted with the first, second, and third planetary gear sets at an external circumference of the input shaft; and

    an output shaft disposed in parallel with the input shaft and provided with an output gear at an external circumference of the output shaft;

    a first shaft fixedly connected with the first rotational element and selectively acting as a fixed element;

    a second shaft fixedly connected with the second rotational element and the sixth rotational element and selectively acting as a fixed element;

    a third shaft fixedly connected with the third rotational element and the seventh rotational element and configured to selectively mesh with the output shaft;

    a fourth shaft fixedly connected with the fourth rotational element and the input shaft;

    a fifth shaft fixedly connected with the fifth rotational element and selectively connected with the first shaft and the third shaft respectively;

    a sixth shaft fixedly connected with the eighth rotational element and selectively connected with the input shaft;

    a first transfer gear configured to selectively deliver a torque between the third shaft and the output shaft; and

    a second transfer gear configured to selectively deliver a torque between the output shaft and the ninth rotational element of the third planetary gear set.

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