Power transmission apparatus for vehicle

Patent metadata

Field	Value
Publication number	US-10883583-B2
Application number	US-201916598183-A
Country	US
Kind code	B2
Filing date	Oct 10, 2019
Priority date	Jun 3, 2019
Publication date	Jan 5, 2021
Grant date	Jan 5, 2021

Abstract

A power transmission apparatus may include a first input shaft fixedly connected to an engine output shaft, a second input shaft mounted external to the first input shaft, a third input shaft mounted and external to the second input shaft, an intermediate shaft and first and second output shafts, an idle shaft mounted in parallel with the second output shaft, a planetary gear mounted on an axis of the intermediate shaft, a plurality of gear sets the first, and second output shafts, the idle shaft, and the planetary gear set, a first synchronizer mounted on the first output shaft, a second synchronizer mounted on the second output shaft, selectively receiving a torque from the third input shaft through two paths, and transmitting the received torque to the second output shaft, and four clutches each of which facilitating selective connection.

First claim

What is claimed is:

1. A power transmission apparatus for a vehicle, the apparatus comprising:
a first input shaft fixedly connected 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 first input 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 first input shaft;
an intermediate shaft and first and second output shafts mounted in parallel with the first, second, and third input shafts;
an idle shaft mounted in parallel with the second output shaft;
a planetary gear set having a first rotation element, a second rotation element, and a third rotation element and mounted on an axis of the intermediate shaft, the third rotation element and one of the first and second rotation elements being selectively connectable to the intermediate shaft, the first and second rotation elements being coupled to the third and second input shafts, respectively;
a plurality of gear sets, each of which is configured to allow at least one torque flow between the intermediate shaft, the first, second, and third input shafts, the first and second output shafts, the idle shaft, and the planetary gear set;
a first synchronizer mounted on the first output shaft, selectively receiving a first torque from the second input shaft through two paths, and transmitting the received first torque to the first output shaft;
a second synchronizer mounted on the second output shaft, selectively receiving a second torque from the third input shaft through two paths, and transmitting the received second torque to the second output shaft; and
four clutches.

2. The power transmission apparatus of claim 1 ,
wherein the planetary gear set is a single pinion planetary gear set and the first rotation element, the second rotation element and the third rotation element are a sun gear, a planet carrier, and a ring gear, respectively.

3. The power transmission apparatus of claim 2 , wherein the first and third rotation elements of the planetary gear set are selectively connectable to the intermediate shaft.

4. The power transmission apparatus of claim 3 , wherein the four clutches include:
a first clutch mounted between the first input shaft and the second input shaft;
a second clutch mounted between the first input shaft and the third input shaft;
a third clutch mounted between the intermediate shaft and the third rotation element of the planetary gear set; and
a fourth clutch mounted between the intermediate shaft and the first rotation element of the planetary gear set.

5. The power transmission apparatus of claim 2 , wherein the second and third rotation elements of the planetary gear set are selectively connectable to the intermediate shaft.

6. The power transmission apparatus of claim 5 , wherein the four clutches include:
a first clutch mounted between the first input shaft and the second input shaft;
a second clutch mounted between the first input shaft and the third input shaft;
a third clutch mounted between the intermediate shaft and the third rotation element of the planetary gear set; and
a fourth clutch mounted between the intermediate shaft and the second rotation element of the planetary gear set.

7. The power transmission apparatus of claim 2 , wherein the plurality of gear sets includes:
a first gear set including a first input gear and a first gear, the first input gear being fixedly connected to the first input shaft, the first gear being fixedly connected to the intermediate shaft and gear-engaged with the first input gear;
a second gear set including a second input gear and a first shifting gear, the second input gear being fixedly connected to the second input shaft, the first shifting gear being rotatably mounted on the first output shaft and gear-engaged with the second input gear;
a third gear set including a second gear, a third input gear, and a second shifting gear, the second gear being fixedly connected to the second rotation element of the planetary gear set, the third input gear being fixedly connected to the second input shaft and gear-engaged with the second gear, and the second shifting gear being rotatably mounted on the first output shaft and gear-engaged with the third input gear;
a fourth gear set including a third gear and a fourth input gear, the third gear being fixedly connected to the first rotation element of the planetary gear set, the fourth input gear fixedly connected to the third input shaft and gear-engaged with the third gear;
a fifth gear set including a third shifting gear and a second idle gear, the third shifting gear being rotatably mounted on the second output shaft, the second idle gear being fixedly connected to the idle shaft and gear-engaged with the third shifting gear;
a sixth gear set including the fourth input gear and a fourth shifting gear, the fourth input gear fixedly connected to the third input shaft, and the fourth shifting gear being rotatably mounted on the second output shaft and gear-engaged with the fourth input gear; and
a seventh gear set including the fourth input gear and a first idle gear, the fourth input gear fixedly connected to the third input shaft, and the first idle gear fixedly connected to the idle shaft and gear-engaged with the fourth input gear.

8. The power transmission apparatus of claim 7 , wherein the plurality of gear sets further include an eighth gear set including a final reduction gear of a differential, and first and second output gears fixedly connected to the first output shaft and the second output shaft respectively and gear-engaged with the final reduction gear.

9. The power transmission apparatus of claim 7 , wherein the first, second, third, and fourth gear sets are mounted in an order of the fourth, third, second and first gear sets from a side of the engine output shaft on the first input shaft and the fifth, sixth, and eighth gear sets are mounted in an order of the eighth, sixth and fifth gear sets from the side of the engine output shaft on the second output shaft.

10. The power transmission apparatus of claim 7 ,
wherein the first synchronizer is configured to selectively connect one of the first shifting gear of the second gear set and the second shifting gear of the third gear set to the first output shaft; and
wherein the second synchronizer is configured to selectively connect one of the third shifting gear of the fifth gear set and the fourth shifting gear of the sixth gear set to the second output shaft.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Kim Chon Ok
• Hwang Seong Wook
• Chae Minho
• Kwon Sun Sung
• Shin Yong Uk

Classifications

• F16H2200/2041

  with four engaging means · CPC title

• F16H2200/2005

  with one sets of orbital gears · CPC title

• F16H2200/0043

  the gear ratios comprising four forward speeds · CPC title

• F16H3/44 Primary

  using gears having orbital motion · CPC title

• F16H3/12

  with means for synchronisation not incorporated in the clutches · CPC title