Planetary gear train of automatic transmission for vehicle

Patent metadata

Field	Value
Publication number	US-9328803-B2
Application number	US-201313957122-A
Country	US
Kind code	B2
Filing date	Aug 1, 2013
Priority date	Nov 5, 2012
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

A planetary gear train of an automatic transmission may include: an input shaft; an output shaft parallel with the input shaft; a first planetary gear set on the input shaft including a first, second and third rotation elements, the first selectively connected to the input shaft, and the third selectively connected to the input shaft; a second planetary gear set on the output shaft including a fourth, fifth and sixth rotation elements, the first selectively connected to the input shaft through two gear ratio paths and selectively connected to a transmission housing, the fifth selectively connected to the input shaft and the transmission housing, and the sixth connected to the second rotation element and directly connected to the output shaft; four transfer gears; and frictional elements including clutches and brakes.

First claim

What is claimed is:

1. A planetary gear train of an automatic transmission for a vehicle, comprising:
an input shaft receiving engine torque;
an output shaft parallel with the input shaft at a predetermined distance and outputting changed torque;
a first planetary gear set disposed on the input shaft, and including a first rotation element selectively connectable to the input shaft, a second rotation element, and a third rotation element selectively connectable to the input shaft;
a second planetary gear set disposed on the output shaft, and including a fourth rotation element selectively connectable to the input shaft or selectively connectable to a transmission housing, a fifth rotation element selectively connectable to the input shaft or the transmission housing, and a sixth rotation element connected to the second rotation element and directly connected to the output shaft;
a first transfer gear including a first transfer drive gear connected to the second rotation element and a first transfer driven gear connected to the sixth rotation element;
a second transfer gear including a second transfer drive gear connected to the third rotation element and a second transfer driven gear connected to the fifth rotation element;
a third transfer gear including a third transfer drive gear selectively connectable to the input shaft and a third transfer driven gear connected to the fourth rotation element; and
a fourth transfer gear including a fourth transfer drive gear connected to the input shaft and a fourth transfer driven gear selectively connectable to the fourth rotation element.

2. The planetary gear train of claim 1 , wherein the first planetary gear set is a single pinion planetary gear set having 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 having 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 frictional elements comprise:
a first clutch disposed between the input shaft and the first rotation element;
a second clutch disposed between the input shaft and the third transfer gear;
a third clutch disposed between the fourth transfer gear and the fourth rotation element;
a fourth clutch disposed between the input shaft and the third rotation element;
a first brake disposed between the fifth rotation element and the transmission housing; and
a second brake disposed between the fourth rotation element and the transmission housing.

4. The planetary gear train of claim 3 , wherein the first clutch and the first brake are operated at a first forward speed;
the first clutch and the second brake 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 first clutch and the fourth clutch are operated at a fifth forward speed;
the third clutch and the fourth clutch are operated at a sixth forward speed;
the second clutch and the fourth clutch are operated at a seventh forward speed;
the fourth clutch and the second brake are operated at an eighth forward speed; and
the third clutch and the first brake are operated at a reverse speed.

5. A planetary gear train of an automatic transmission for a vehicle, comprising:
an input shaft receiving engine torque;
an output shaft parallel with the input shaft with a predetermined distance and outputting changed torque;
a first planetary gear set disposed on the input shaft, and including a first rotation element selectively connectable to the input shaft, a second rotation element, and a third rotation element selectively connectable to the input shaft;
a second planetary gear set disposed on the output shaft, and including a fourth rotation element selectively connectable to the input shaft or selectively connectable to a transmission housing, a fifth rotation element selectively connectable to the input shaft or the transmission housing, and a sixth rotation element connected to the second rotation element and directly connected to the output shaft;
a first clutch selectively connecting the input shaft with the first rotation element;
a second clutch selectively connecting the input shaft with the fourth rotation element;
a third clutch selectively connecting the input shaft with the fourth rotation element;
a fourth clutch selectively connecting the input shaft with the third rotation element;
a first brake selectively connecting the fifth rotation element with the transmission housing;
a second brake selectively connecting the fourth rotation element with the transmission housing;
a first transfer gear connecting the second rotation element with the sixth rotation element;
a second transfer gear connecting the third rotation element with the fifth rotation element;
a third transfer gear connecting the second clutch with the fourth rotation element; and
a fourth transfer gear connecting the input shaft with the third clutch.

6. The planetary gear train of claim 5 , wherein the first planetary gear set is a single pinion planetary gear set having 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 having 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.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Lee Chang Wook
• Seo Kangsoo
• Noh Myonghoon
• Kook Jae Chang
• Lee Hyukjun
• Park Jongsool

Classifications

• F16H2200/2007

  with two sets of orbital gears · CPC title

• F16H3/58

  with sets of orbital gears, each consisting of two or more intermeshing orbital gears · CPC title

• F16H2057/087

  Arrangement and support of friction devices in planetary gearings, e.g. support of clutch drums, stacked arrangements of friction devices · CPC title

• F16H57/08

  of gearings with members having orbital motion · CPC title

• F16H2200/2046

  with six engaging means · CPC title