Power transmission apparatus for vehicle

Patent metadata

Field	Value
Publication number	US-10023042-B2
Application number	US-201615280230-A
Country	US
Kind code	B2
Filing date	Sep 29, 2016
Priority date	Dec 14, 2015
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A power transmission apparatus for a vehicle may include a first input shaft directly connected to an engine, a second input shaft selectively receiving torque of the engine through a first clutch, a third input shaft selectively receiving the torque of the engine through a second clutch, an intermediate shaft disposed in parallel with the first, second, and third input shafts, a transfer gear fixedly disposed on the intermediate shaft, an first shifting member outputting first and second preliminarily shifted torques, an second shifting member outputting third and fourth preliminarily shifted torques, a third shifting member outputting eight forward speed stage stages and one reverse speed stage, and an auxiliary power source disposed on a supply of the torque transmitted from the first shifting member and the second shifting member to the third shifting member and supplying torque to the third shifting member.

First claim

What is claimed is:

1. A power transmission apparatus for a vehicle comprising:
a first input shaft connected to an engine;
a second input shaft surrounding the first input shaft without rotational interference with the first input shaft and selectively receiving torque of the engine through a first clutch;
a third input shaft surrounding the second input shaft without rotational interference with the second input shaft and selectively receiving the torque of the engine through a second clutch;
an intermediate shaft disposed in parallel with the first, second, and third input shafts;
a transfer gear fixedly disposed on the intermediate shaft and outputting torque of the intermediate shaft;
a first shifting member receiving the torque of the engine from the third input shaft, changing the torque of the engine into first and second preliminarily shifted torques, and outputting the first and second preliminarily shifted torques;
a second shifting member receiving the torque of the engine from the second input shaft, changing the torque of the engine into third and fourth preliminarily shifted torques, and outputting the third and fourth preliminarily shifted torques;
a third shifting member changing the torque of the engine directly transmitted from the first input shaft and the first preliminarily shifted torque to the fourth preliminarily shifted torque selectively transmitted from the first shifting member or the second shifting member into eight forward speed stage stages and one reverse speed stage, and outputting the eight forward speed stage stages and the one reverse speed stage; and
an auxiliary power source disposed on a supply of the torque transmitted from the first shifting member and the second shifting member to the third shifting member and supplying torque to the third shifting member.

2. The power transmission apparatus of claim 1 , wherein the first shifting member comprises:
a 1 / 7 drive gear and a 3 / 5 drive gear fixedly disposed on the third input shaft;
a 1 / 7 driven gear rotatably disposed on the intermediate shaft and engaged with the 1 / 7 drive gear;
a 3 / 5 driven gear rotatably disposed on the intermediate shaft and engaged with the 3 / 5 drive gear; and
a first synchronizer operably connecting at least one of the 1 / 7 driven gear and the 3 / 5 driven gear to the intermediate shaft selectively.

3. The power transmission apparatus of claim 1 , wherein the first shifting member comprises:
a 1 / 7 drive gear and a 3 / 5 drive gear rotatably disposed on the third input shaft;
a first synchronizer operably connecting at least one of the 1 / 7 drive gear and the 3 / 5 drive gear to the third input shaft selectively;
a 1 / 7 driven gear fixedly disposed on the intermediate shaft and engaged with the 1 / 7 drive gear; and
a 3 / 5 driven gear fixedly disposed on the intermediate shaft and engaged with the 3 / 5 drive gear.

4. The power transmission apparatus of claim 1 , wherein the second shifting member comprises:
an 8 /R drive gear rotatably disposed on the second input shaft;
a 2 / 6 drive gear rotatably disposed on the second input shaft and engaged with the transfer gear on the intermediate shaft;
a second synchronizer operably connecting the 8 /R drive gear or the 2 / 6 drive gear to the second input shaft selectively; and
an 8 /R driven gear fixedly disposed on the intermediate shaft and operably connected to the 8 /R drive gear through an idle gear.

5. The power transmission apparatus of claim 4 , wherein the auxiliary power source includes a motor/generator having a motor shaft drive gear and the motor shaft drive gear is engaged with the 2 / 6 drive gear of the second shifting member.

6. The power transmission apparatus of claim 4 , wherein the auxiliary power source includes a motor/generator having a motor shaft drive gear and a motor shaft driven gear, and the motor shaft drive gear is engaged with the motor shaft driven gear fixedly disposed on the intermediate shaft.

7. The power transmission apparatus of claim 4 , wherein the auxiliary power source includes a motor/generator having a motor shaft drive gear and the motor shaft drive gear is engaged with the transfer gear fixedly disposed on the intermediate shaft.

8. The power transmission apparatus of claim 1 , wherein the third shifting member comprises:
a first planetary gear set including a first sun gear, a first planet carrier, and a first ring gear as first, second, third rotation elements thereof;
a second planetary gear set including a second sun gear, a second planet carrier, and a second ring gear as fourth, fifth, and sixth rotation elements thereof;
four rotation shafts directly connected to at least one rotation element among the first, second, third, fourth, fifth, and sixth rotation elements of the first planetary gear set and the second planetary gear set; and
frictional elements, at least one of the frictional elements selectively connecting at least one rotation shaft among the four rotation shafts to the first input shaft or selectively connecting one rotation element of the first planetary gear set to one rotation element of the second planetary gear set, and another of the frictional elements selectively connecting another rotation shaft among the four rotation shafts to a transmission housing.

9. The power transmission apparatus of claim 8 , wherein each of the first planetary gear set and the second planetary gear set is a single pinion planetary gear set, and
wherein the four rotation shafts comprise:
a first rotation shaft connecting the first sun gear with the second sun gear and receiving torque from the first shifting member and the second shifting member;
a second rotation shaft connected to the second planet carrier and connected to the first input shaft;
a third rotation shaft connected to the first planet carrier, connected to an output shaft, and selectively connectable to the second ring gear; and
a fourth rotation shaft connected to the first ring gear and selectively connectable to the transmission housing.

10. The power transmission apparatus of claim 9 , wherein the frictional elements comprise:
a third clutch disposed between the first planet carrier and the second ring gear; and
a brake disposed between the fourth rotation shaft and the transmission housing.

11. The power transmission apparatus of claim 8 , wherein each of the first planetary gear set and the second planetary gear set is a single pinion planetary gear set, and
wherein the four rotation shafts comprise:
a first rotation shaft connecting the first sun gear to the second sun gear and receiving torque from the first shifting member and the second shifting member;
a second rotation shaft connected to the second planet carrier and selectively connectable to the first input shaft;
a third rotation shaft connecting the first planet carrier to the second ring gear and connected to an output shaft; and
a fourth rotation shaft connected to the first ring gear and selectively connectable to the transmission housing.

12. The power transmission apparatus of claim 11 , wherein the frictional elements comprise:
a third clutch disposed between the first input shaft and the second rotation shaft; and
a brake disposed between the fourth rotation shaft and the transmission housing.

13. The power transmission apparatus of claim 8 , wherein each of the first planetary gear set and the second planetary gear set is a single pinion planetary gear set, and
wherein the four rotation shafts comprise:
a first rotation shaft connected to the first sun gear, selectively connectable to the secon

Assignees

• Hyundai Motor Co Ltd

Inventors

• Cho Wonmin
• Hwang Seong Wook
• Shin Yong Uk
• Ji Seongwook
• Son Woochurl
• KWON Hyun Sik
• Lim Ki Been
• Chang Woo Jin
• Kook Jae Chang
• Kim Ki Tae

Classifications

• B60K6/48

  Parallel type · CPC title

• B60K2006/4816

  Electric machine connected or connectable to gearbox internal shaft · CPC title

• B60K6/547 Primary

  the transmission being a stepped gearing · CPC title

• B60K6/365

  with the gears having orbital motion · CPC title

• B60Y2300/19

  Improvement of gear change, e.g. synchronisation or smoothing gear shift · CPC title