Power transmission apparatus for a vehicle

Patent metadata

Field	Value
Publication number	US-10690222-B2
Application number	US-201816208328-A
Country	US
Kind code	B2
Filing date	Dec 3, 2018
Priority date	Aug 22, 2018
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

A power transmission apparatus for a vehicle may include a first input shaft selectively connectable to an engine output shaft, a second input shaft coaxial and selectively connectable to the first input shaft, a torque mediating shaft coaxial with the first input shaft, a first intermediate shaft in parallel with the first input shaft, a compound shifting section including a first planetary gear set having a sun gear fixed to the torque mediating shaft, a planet carrier fixed to the second input shaft, and a ring gear and a second planetary gear set having a sun gear fixedly to the first intermediate shaft, a ring gear selectively connectable to a transmission housing, and a planet carrier for outputting a torque, and a fixed shifting section receiving a torque from the compound shifting section and outputting a modified torque to the second sun gear of the compound shifting section.

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 for receiving an input torque through a first clutch;
a second input shaft formed as a hollow shaft, mounted coaxial with and external to a first portion of the first input shaft without rotational interference with the first input shaft, and selectively connectable to the engine output shaft through a second clutch;
a torque mediating shaft mounted coaxial with and external to a second portion of the first input shaft without rotational interference with the first input shaft;
a first intermediate shaft mounted in parallel with the first input shaft;
a compound shifting section including a first planetary gear set and a second planetary gear set,
wherein the first planetary gear set is mounted on the first input shaft and has a first sun gear fixedly connected to the torque mediating shaft, a first planet carrier fixedly connected to the second input shaft, and a first ring gear integrally formed with an intermediate output gear, and
wherein the second planetary gear set is mounted on the first intermediate shaft and has a second sun gear fixedly connected to the first intermediate shaft, a second ring gear selectively connectable to a transmission housing through a first brake, and a second planet carrier for outputting a torque;

a fixed shifting section engaged with the compound shifting section and receiving a torque from the compound shifting section through the first input shaft and the torque mediating shaft and outputting a modified torque to the second sun gear of the compound shifting section; and
an output shaft mounted in parallel with the first input shaft and on a same axis of the first intermediate shaft, and outputting a torque received from the first ring gear and the second planet carrier of the compound shifting section to a differential.

2. The power transmission apparatus of claim 1 ,
wherein the output shaft is fixedly connected to the second planet carrier of the compound shifting section, and is formed with an output shaft input gear gear-meshed with the intermediate output gear integrally formed on an external circumference of the first ring gear.

3. The power transmission apparatus of claim 1 ,
wherein the first and second planetary gear sets are respectively a single pinion planetary gear set.

4. The power transmission apparatus of claim 1 ,
wherein the first clutch and the second clutch are connected to the engine output shaft in parallel.

5. The power transmission apparatus of claim 1 , wherein the fixed shifting section includes:
a first drive gear fixedly connected to the first input shaft and the torque mediating shaft; and
a first driven gear fixedly connected to the first intermediate shaft and gear-meshed with the first drive gear.

6. The power transmission apparatus of claim 1 , wherein the fixed shifting section includes:
a first drive gear fixedly connected to the torque mediating shaft;
a first driven gear fixedly connected to the first intermediate shaft and gear-meshed with the first drive gear;
a second drive gear rotatably mounted on the first input shaft;
a second driven gear fixedly connected to the first intermediate shaft and gear-meshed with the second drive gear; and
a first synchronizer selectively connecting the first drive gear to the first input shaft or the second drive gear to the first input shaft.

7. The power transmission apparatus of claim 6 ,
wherein a gear ratio between the first drive gear and the first driven gear is used for realizing a first forward speed and a fifth forward speed; and
wherein a gear ratio between the second drive gear and the second driven gear is used for realizing a second forward speed and a fourth forward speed.

8. The power transmission apparatus of claim 1 , wherein the fixed shifting section includes:
a third input shaft formed as a hollow shaft, coaxially mounted between the first and second input shafts without rotational interference with the first and second input shafts, and selectively connectable to input shaft through a third clutch;
a second intermediate shaft mounted in parallel with the first input shaft;
a first drive gear fixedly connected to the torque mediating shaft;
a first driven gear fixedly connected to the first intermediate shaft and gear-meshed with the first drive gear;
a second drive gear rotatably mounted on the third input shaft;
a second driven gear fixedly connected to the first intermediate shaft and gear-meshed with the second drive gear;
a first synchronizer selectively connecting the first drive gear to the third input shaft or the second drive gear to the third input shaft;
a third drive gear rotatably mounted on the first intermediate shaft;
a first intermediate drive gear fixedly connected to the first input shaft and gear-meshed with the third drive gear;
a second synchronizer selectively connecting the third drive gear to the first intermediate shaft;
a fourth drive gear rotatably mounted on the second intermediate shaft and gear-meshed with the first drive gear;
a fifth drive gear rotatably mounted on the second intermediate shaft and gear-meshed with the second driven gear; and
a third synchronizer selectively connecting the fourth drive gear to the second intermediate shaft or the fifth drive gear to the second intermediate shaft.

9. The power transmission apparatus of claim 8 ,
wherein the second intermediate shaft is integrally formed with a second intermediate driven gear gear-meshed with a second intermediate drive gear fixed to the first input shaft.

10. The power transmission apparatus of claim 8 ,
wherein the torque mediating shaft is selectively connectable to the transmission housing through a second brake.

11. The power transmission apparatus of claim 1 ,
wherein the first clutch, the second clutch, and the third clutch are connected to the engine output shaft in parallel.

12. The power transmission apparatus of claim 8 ,
wherein a gear ratio between the first drive gear and the first driven gear is used for realizing a third forward speed and a seventh forward speed;
wherein a gear ratio between the second drive gear and the second driven gear is used for realizing a first forward speed and a ninth forward speed;
wherein a gear ratio between the third drive gear and the first intermediate drive gear is used for realizing a fourth forward speed and a sixth forward speed;
wherein a gear ratio between the fourth drive gear and the first driven gear is used for realizing a second forward speed and an eighth forward speed; and
wherein a gear ratio between the fifth drive gear and the second driven gear is used for realizing an eleventh forward speed and a reverse speed.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Hwang Seong Wook
• Ji Seongwook
• Kim Ki Dong
• Cho Wonmin
• KWON Hyun Sik
• Jang Cheol Ho
• Park Kijong
• Kim Ki Tae

Classifications

• F16H2200/0039

  the gear ratios comprising three forward speeds · CPC title

• F16H2200/2007

  with two sets of orbital gears · CPC title

• F16H2200/2038

  with three engaging means · CPC title

• F16H3/006

  power being selectively transmitted by parallel flow paths, e.g. dual clutch transmissions · CPC title

• F16H3/66 Primary

  composed of a number of gear trains without drive passing from one train to another · CPC title