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POWER TRANSMISSION APPARATUS FOR VEHICLE

  • US 20190120342A1
  • Filed: 11/30/2017
  • Published: 04/25/2019
  • Est. Priority Date: 10/19/2017
  • Status: Active Grant
First Claim
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1. A power transmission apparatus for a vehicle, comprising:

  • a first input shaft selectively connected with an engine output shaft through a first clutch;

    a second input shaft formed as a hollow shaft, disposed about an external circumference of the first input shaft without any rotational interference, and selectively connected to the engine output shaft through a second clutch;

    a third input shaft formed as a hollow shaft, disposed about an external circumference of the second input shaft without any rotational interference, and selectively connected to the engine output shaft through a third clutch;

    a power transmission shaft formed as a hollow shaft and disposed about the external circumference of the second input shaft without any rotational interference in correspondence to a rear side of the third input shaft;

    first and second center shafts disposed in parallel on the same axis with the first input shaft and selectively connected with each other through a fourth clutch;

    an idle shaft disposed in parallel by a predetermined distance with the first input shaft;

    a fixed transmission for selectively shifting torque input according to each gear ratio of four change gear trains disposed by externally gear connecting each drive gear and each driven gear to the first and second input shafts, the power transmission shaft, the first center shaft, and the idle shaft and outputting the torque through the second center shaft and the power transmission shaft;

    a composite transmission including a planetary gear set in which a sun gear is fixedly connected to one side to the power transmission shaft, configured to fix and connect a planetary carrier with the third input shaft and power connect a ring gear with the second center shaft, and complementarily composite shift and output input torque;

    [please explain what is meant by the phrase “

    complementarily composite shifting”

    ] and an output shaft disposed in parallel by a predetermined distance with the first input shaft and outputting the torque transmitted from the composite transmission to a final reduction gear.

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