Power transmission apparatus for vehicle

Patent metadata

Field	Value
Publication number	US-2020355266-A1
Application number	US-201916596193-A
Country	US
Kind code	A1
Filing date	Oct 8, 2019
Priority date	May 8, 2019
Publication date	Nov 12, 2020
Grant date	—

Abstract

A power transmission apparatus configured for a vehicle, may include a first input shaft selectively connectable to an engine output shaft, a second input shaft mounted coaxial with the first input shaft and selectively connectable to the engine output shaft, a third input shaft external to the second input shaft and selectively connectable to the engine output shaft, a torque mediating shaft mounted coaxial with the first input shaft, first and second intermediate shafts, an idle shaft, a first shifting section including five gear sets, the first and second intermediate shafts, the torque mediating shaft and the idle shaft, a second shifting section including a planetary gear set having a sun gear fixedly connected to the torque mediating shaft, and an output shaft mounted coaxial with and selectively connectable to the first intermediate shaft and outputting a torque from the first and second shifting sections.

First claim

What is claimed is:

1 . A power transmission apparatus for a vehicle, the power transmission apparatus comprising:
a first input shaft selectively connectable to an engine output shaft fixedly connected to an engine; a second input shaft formed as a hollow shaft, mounted coaxial with and external to the first input shaft without rotational interference therebetween, and selectively connectable to the engine output shaft; a third input shaft formed as a hollow shaft, mounted coaxial with and external to the second input shaft, and selectively connectable to the engine output shaft; a torque mediating shaft formed as a hollow shaft and mounted coaxial with and external to the first input shaft without rotational interference therebetween; first and second intermediate shafts mounted in parallel with the first input shaft; an idle shaft mounted in parallel with the second intermediate shaft; a first shifting section including five gear sets engaged to the first and third input shafts, the first and second intermediate shafts, the torque mediating shaft and the idle shaft, wherein the first shifting section is configured of selectively receiving a torque from the first and third input shafts, of shifting the received torque, and of outputting the shifted torque; a second shifting section including a planetary gear set having a first rotation element fixedly connected to the torque mediating shaft, wherein the second shifting section is configured of selectively receiving torques from the first shifting section and the second input shaft and outputting shifted torque through one gear set; and an output shaft mounted coaxial with and selectively connectable to the first intermediate shaft and outputting a torque from the first and second shifting sections;

2 . The power transmission apparatus of claim 1 , wherein the five gear sets of the first shifting section include:
a first gear set including a first input gear fixedly connected to the first input shaft, and a first shifting gear rotatably mounted to the first intermediate shaft and gear-engaged with the first input gear; a second gear set including a second input gear fixedly connected to the first input shaft, and a second shifting gear rotatably mounted to the first intermediate shaft and gear-engaged with the second input gear; a third gear set including a third input gear fixedly connected to the third input shaft, and a first gear fixedly connected to the second intermediate shaft and gear-engaged with the third input gear; a fourth gear set including a third shifting gear rotatably mounted to the second intermediate shaft, and a first idle gear fixedly connected to the idle shaft and gear-engaged with the third shifting gear; and a fifth gear set including a fourth shifting gear rotatably mounted to the second intermediate shaft, a second gear fixedly connected to the torque mediating shaft and gear-engaged with the fourth shifting gear, a second idle gear fixedly connected to the idle shaft and gear-engaged with the second gear, and a third gear fixedly connected to the first intermediate shaft and gear-engaged with the second gear.

3 . The power transmission apparatus of claim 2 , further including:
a first synchronizer configured for selectively connecting the first shifting gear or the second shifting gear to the first intermediate shaft; and a second synchronizer configured for selectively connecting the third shifting gear or the fourth shifting gear to the second intermediate shaft.

4 . The power transmission apparatus of claim 2 ,
wherein a gear ratio of the first gear set is used for a first forward speed and a seventh forward speed, wherein a gear ratio of the second gear set is used for a third forward speed and a fifth forward speed, wherein gear ratios of the third and fourth gear sets are used for an eighth forward speed, and wherein gear ratios of the third and fifth gear sets are for a second forward speed and a sixth forward speed.

5 . The power transmission apparatus of claim 2 ,
wherein a second rotation element of the planetary gear set is fixedly connected to the second input shaft and a third rotation element of the planetary gear set is gear-engaged with the output shaft through a sixth gear set, and wherein the one gear set is the sixth gear set.

6 . The power transmission apparatus of claim 5 , wherein the sixth gear set includes:
a fourth gear fixedly connected to the third rotation element of the planetary gear set; and a fifth gear fixedly connected to the output shaft and gear-engaged with the fourth gear.

7 . The power transmission apparatus of claim 5 , wherein the planetary gear set is a single pinion planetary gear set including a sun gear, a planet carrier and a ring gear as the first rotation element, the second rotation element and the third rotation element, respectively.

8 . The power transmission apparatus of claim 1 , further includes four clutches.

9 . The power transmission apparatus of claim 8 , wherein the four clutches include:
a first clutch mounted between the engine output shaft and the first input shaft; a second clutch mounted between the engine output shaft and the second input shaft; a third clutch mounted between the engine output shaft and the third input shaft; and a fourth clutch mounted between the first intermediate shaft and the output shaft.

10 . The power transmission apparatus of claim 1 ,
wherein the first shifting section and the second shifting section are mounted in series of the second shifting section and the first shifting section from a side of the engine output shaft.

11 . The power transmission apparatus of claim 5 , further including:
a brake mounted between the first intermediate shaft and a transmission housing.

12 . The power transmission apparatus of claim 11 ,
wherein a gear ratio of the first gear set is used for a first forward speed and a seventh forward speed, wherein a gear ratio of the second gear set is used for a third forward speed and a fifth forward speed, wherein gear ratios of the third and fourth gear sets are used for a ninth forward speed and a reverse speed, and wherein gear ratios of the third and fifth gear sets are for a second forward speed and a sixth forward speed.

13 . The power transmission apparatus of claim 5 , further including:
a brake mounted between the first intermediate shaft and a transmission housing; and a motor/generator gear-engaged with the idle shaft.

14 . The power transmission apparatus of claim 13 , further including:
a fourth input gear fixedly connected to a motor shaft of the motor/generator and gear-engaged with the second idle gear fixedly mounted on the idle shaft.

15 . The power transmission apparatus of claim 14 ,
wherein the fifth gear set further includes the fourth input gear.

16 . The power transmission apparatus of claim 15 ,
wherein a gear ratio of the first gear set is used for a first forward speed and a seventh forward speed, wherein a gear ratio of the second gear set is used for a third forward speed and a fifth forward speed, wherein gear ratios of the third and fourth gear sets are used for a ninth forward speed and a reverse speed, and wherein gear ratios of the third and fifth gear sets are for a second forward speed and a sixth forward speed.

17 . The power transmission apparatus of claim 5 , further including:
a brake mounted between the first intermediate shaft and a transmission housing; and a motor/generator selectively connectable to the engine output shaft.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Park Juhyeon
• Hwang Seong Wook
• Ji Seongwook
• Kim Ki Tae
• Cho Wonmin
• KWON Hyun Sik
• Yoo Ilhan
• Kwon Sun Sung
• Kim Chon Ok

Classifications

• F16H3/44

  using gears having orbital motion · CPC title

• F16H2200/0056

  the gear ratios comprising seven forward speeds · CPC title

• F16H2200/0047

  the gear ratios comprising five forward speeds · CPC title

• B60K17/22

  characterised by arrangement, location, or type of main drive shafting, e.g. cardan shaft · CPC title

• F16H2200/0039

  the gear ratios comprising three forward speeds · CPC title