Planetary gear train of automatic transmission for vehicle

Patent metadata

Field	Value
Publication number	US-2016091069-A1
Application number	US-201414557746-A
Country	US
Kind code	A1
Filing date	Dec 2, 2014
Priority date	Sep 26, 2014
Publication date	Mar 31, 2016
Grant date	—

Abstract

A planetary gear train of an automatic transmission for a vehicle including a first shaft receiving torque of an engine, a second shaft disposed in parallel with the first shaft at a predetermined distance, a first planetary gear set disposed on the first shaft, and including a first rotation element, a second rotation element, and a third rotation element, a second planetary gear set disposed on the second shaft, and including a fourth rotation element connected to the second rotation element through an externally-meshed gear, a fifth rotation element connected to the third rotation element through an externally-meshed gear, and a sixth rotation element selectively connected to the first shaft through two paths including respectively externally-meshed gears, four transfer gears forming the externally-meshed gears, and frictional elements including clutches and a brake.

First claim

What is claimed is:

1 . A planetary gear train of an automatic transmission for a vehicle comprising:
a first shaft receiving torque of an engine; a second shaft disposed in parallel with the first shaft at a predetermined distance; a first planetary gear set disposed on the first shaft, and including a first rotation element selectively connected to the first shaft, a second rotation element selectively connected to the first shaft and selectively connected to a transmission housing, and a third rotation element; a second planetary gear set disposed on the second shaft, and including a fourth rotation element connected to the second rotation element through an externally-meshed gear and selectively connected to the transmission housing, a fifth rotation element connected to the third rotation element through an externally-meshed gear and directly connected to an output shaft, and a sixth rotation element selectively connected to the first shaft through two paths including respectively externally-meshed gears; four transfer gears forming the externally-meshed gears; and frictional elements including clutches selectively connecting the first shaft to rotation elements of the first and second planetary gear sets and a brake selectively connecting rotation elements of the first and second planetary gear sets to the transmission housing.

2 . The planetary gear train of claim 1 , wherein the first planetary gear set is a single pinion planetary gear set including a first sun gear being the first rotation element, a first planet carrier being the second rotation element, and a first ring gear being the third rotation element, and
the second planetary gear set is a single pinion planetary gear set including a second sun gear being the fourth rotation element, a second planet carrier being the fifth rotation element, and a second ring gear being the sixth rotation element.

3 . The planetary gear train of claim 1 , wherein the first planetary gear set is a double pinion planetary gear set including a first sun gear being the first rotation element, a first ring gear being the second rotation element, and a first planet carrier being the third rotation element, and
the second planetary gear set is a single pinion planetary gear set including a second sun gear being the fourth rotation element, a second planet carrier being the fifth rotation element, and a second ring gear being the sixth rotation element.

4 . The planetary gear train of claim 1 , wherein the first planetary gear set is a single pinion planetary gear set including a first sun gear being the first rotation element, a first planet carrier being the second rotation element, and a first ring gear being the third rotation element, and
the second planetary gear set is a double pinion planetary gear set including a second sun gear being the fourth rotation element, a second ring gear being the fifth rotation element, and a second planet carrier being the sixth rotation element.

5 . The planetary gear train of claim 1 , wherein the four transfer gears comprise:
a first transfer gear connecting the second rotation element to the fourth rotation element; a second transfer gear connecting the third rotation element to the fifth rotation element; a third transfer gear connecting the first shaft to the sixth rotation element; and a fourth transfer gear connecting the first shaft to the sixth rotation element, wherein a gear ratio of the third transfer gear differs from that of the fourth transfer gear.

6 . The planetary gear train of claim 5 , wherein the frictional elements comprise:
a first clutch disposed between the fourth transfer gear and the sixth rotation element; a second clutch disposed between the first shaft and the first rotation element; a third clutch disposed between the first shaft and the second rotation element; a fourth clutch disposed between the third transfer gear and the sixth rotation element; a fifth clutch disposed between the fourth rotation element and the fifth rotation element; and a first brake disposed between the fourth rotation element and the transmission housing.

7 . The planetary gear train of claim 6 , wherein the first clutch and the first brake are operated at a first forward speed,
the first clutch and the fifth clutch are operated at a second forward speed, the first clutch and the second clutch are operated at a third forward speed, the first clutch and the third clutch are operated at a fourth forward speed, the second clutch and the third clutch are operated at a fifth forward speed, the third clutch and the fifth clutch are operated at a sixth forward speed, the third clutch and the fourth clutch are operated at a seventh forward speed, the fourth clutch and the fifth clutch are operated at an eighth forward speed, the second clutch and the fourth clutch are operated at a ninth forward speed, and the second clutch and the first brake are operated at a reverse speed.

8 . The planetary gear train of claim 5 , wherein the frictional elements comprise:
a first clutch disposed between the fourth transfer gear and the sixth rotation element; a second clutch disposed between the first shaft and the first rotation element; a third clutch disposed between the first shaft and the second rotation element; a fourth clutch disposed between the third transfer gear and the sixth rotation element; a fifth clutch disposed between the fourth rotation element and the fifth rotation element; and a first brake disposed between the second rotation element and the transmission housing.

9 . The planetary gear train of claim 5 , wherein the frictional elements comprise:
a first clutch disposed between the first shaft and the fourth transfer gear; a second clutch disposed between the first shaft and the first rotation element; a third clutch disposed between the first shaft and the second rotation element; a fourth clutch disposed between the third transfer gear and the sixth rotation element; a fifth clutch disposed between the fourth rotation element and the fifth rotation element; and a first brake disposed between the fourth rotation element and the transmission housing.

10 . The planetary gear train of claim 5 , wherein the frictional elements comprise:
a first clutch disposed between the fourth transfer gear and the sixth rotation element; a second clutch disposed between the first shaft and the first rotation element; a third clutch disposed between the first shaft and the second rotation element; a fourth clutch disposed between the first shaft and the third transfer gear; a fifth clutch disposed between the fourth rotation element and the fifth rotation element; and a first brake disposed between the fourth rotation element and the transmission housing.

11 . The planetary gear train of claim 5 , wherein the frictional elements comprise:
a first clutch disposed between the fourth transfer gear and the sixth rotation element; a second clutch disposed between the first shaft and the first rotation element; a third clutch disposed between the first shaft and the second rotation element; a fourth clutch disposed between the first shaft and the third transfer gear; a fifth clutch disposed between the fourth rotation element and the sixth rotation element; and a first brake disposed between the fourth rotation element and the transmission housing.

12 . The planetary gear train of claim 5 , wherein the frictional elements comprise:
a first clutch disposed between the fourth transfer gear and the sixth rotation element; a second clutch disposed between the first shaft and the first rotation element;

Assignees

• Hyundai Motor Co Ltd

Inventors

• Lee Changwook
• Kook Jaechang
• Park Jongsool
• Seo Kangsoo
• Hwang Donghwan

Classifications

• F16H37/042 Primary

  change gear transmissions in group arrangement · CPC title

• F16H2200/0082

  characterised by the number of reverse speeds · CPC title

• F16H2200/2046

  with six engaging means · CPC title

• F16H2200/2007

  with two sets of orbital gears · CPC title

• F16H2200/0065

  the gear ratios comprising nine forward speeds · CPC title