Planetary gear train of automatic transmission for vehicle

Patent metadata

Field	Value
Publication number	US-9593745-B2
Application number	US-201514923278-A
Country	US
Kind code	B2
Filing date	Oct 26, 2015
Priority date	May 13, 2015
Publication date	Mar 14, 2017
Grant date	Mar 14, 2017

Abstract

A planetary gear train of an automatic transmission for a vehicle may include an input shaft receiving power from an engine, an output shaft outputting power changed in speed, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear, a first rotating shaft selectively connected with a transmission housing, a second rotating shaft, a third rotating shaft selectively connected with the transmission housing, a fourth rotating shaft directly connected with the input shaft so as to be continuously operated as an input element, a fifth rotating shaft, a sixth rotating shaft selectively connected with the first, second, and fifth rotating shafts, a seventh rotating shaft, an eighth rotating shaft selectively connected with the seventh rotating shaft and simultaneously directly connected with the output shaft, and six friction elements.

First claim

What is claimed is:

1. A planetary gear train of an automatic transmission for a vehicle, the planetary gear train comprising:
an input shaft receiving power from an engine;
an output shaft outputting power changed in speed;
a first planetary gear set having a first sun gear, a first planet carrier, and a first ring gear;
a second planetary gear set having a second sun gear, a second planet carrier, and a second ring gear;
a third planetary gear set having a third sun gear, a third planet carrier, and a third ring gear;
a fourth planetary gear set having a fourth sun gear, a fourth planet carrier, and a fourth ring gear;
a first rotating shaft including the first and second sun gears, and selectively connected with a transmission housing;
a second rotating shaft including the first planet carrier and the fourth ring gear;
a third rotating shaft including the first ring gear, and selectively connected with the transmission housing;
a fourth rotating shaft including the second planet carrier and the fourth sun gear, and directly connected with the input shaft so as to be continuously operated as an input element;
a fifth rotating shaft including the second ring gear and the third sun gear;
a sixth rotating shaft including the third planet carrier, and selectively connected with the first, second, and fifth rotating shafts;
a seventh rotating shaft including the third ring gear;
an eighth rotating shaft including the fourth planet carrier, and selectively connected with the seventh rotating shaft and simultaneously directly connected with the output shaft; and
six friction elements, each of the six friction elements disposed between two of the rotating shafts, or disposed such that one of the rotating shafts is selectively connected with the transmission housing.

2. The planetary gear train of claim 1 , wherein the first, second, third, and fourth planetary gear sets each comprise single pinion planetary gear sets.

3. The planetary gear train of claim 1 , wherein the first, second, third, and fourth planetary gear sets are sequentially disposed from an engine side.

4. The planetary gear train of claim 1 , wherein the six friction elements include:
a first clutch interposed between the seventh rotating shaft and the eighth rotating shaft;
a second clutch which is interposed between the first rotating shaft and the sixth rotating shaft;
a third clutch which is interposed between the second rotating shaft and the sixth rotating shaft;
a fourth clutch which is interposed between the fifth rotating shaft and the sixth rotating shaft;
a first brake which is interposed between the first rotating shaft and the transmission housing; and
a second brake which is interposed between the third rotating shaft and the transmission housing.

5. The planetary gear train of claim 4 , wherein gear shift stages, which are implemented by selectively operating the six friction elements, include:
a first forward gear shift stage implemented by simultaneously operating the second clutch and the first and second brakes;
a second forward gear shift stage implemented by simultaneously operating the first and second clutches and the second brake;
a third forward gear shift stage implemented by simultaneously operating the second and fourth clutches and the second brake;
a fourth forward gear shift stage implemented by simultaneously operating the first and fourth clutches and the second brake;
a fifth forward gear shift stage implemented by simultaneously operating the third and fourth clutches and the second brake;
a sixth forward gear shift stage implemented by simultaneously operating the first and third clutches and the second brake;
a seventh forward gear shift stage implemented by simultaneously operating the first, second, and third clutches;
an eighth forward gear shift stage implemented by simultaneously operating the first and third clutches and the first brake;
a ninth forward gear shift stage implemented by simultaneously operating the third and fourth clutches and the first brake;
a tenth forward gear shift stage implemented by simultaneously operating the first and fourth clutches and the first brake; and
a reverse gear shift stage implemented by simultaneously operating the first and second clutches and the first brake.

6. A planetary gear train of an automatic transmission for a vehicle, the planetary gear train comprising:
an input shaft receiving power from an engine;
an output shaft outputting power changed in speed;
a first planetary gear set having a first sun gear, a first planet carrier, and a first ring gear;
a second planetary gear set having a second sun gear, a second planet carrier, and a second ring gear;
a third planetary gear set having a third sun gear, a third planet carrier, and a third ring gear;
a fourth planetary gear set having a fourth sun gear, a fourth planet carrier, and a fourth ring gear,
wherein the input shaft is directly connected to the second planet carrier and the fourth sun gear,
the output shaft is directly connected to the fourth planet carrier,
the first sun gear and the second sun gear are directly connected to each other,
the first planet carrier and the fourth ring gear are directly connected to each other, and
the second ring gear and the third sun gear are directly connected to each other;
a first clutch selectively connecting the third ring gear with the fourth planet carrier;
a second clutch selectively connecting the first and second sun gears with the third planet carrier;
a third clutch selectively connecting the first planet carrier and the fourth ring gear with the third planet carrier;
a fourth clutch selectively connecting the second ring gear and the third sun gear with the third planet carrier;
a first brake selectively connecting the first and second sun gears to a transmission housing; and
a second brake selectively connecting the first ring gear to the transmission housing.

7. The planetary gear train of claim 6 , wherein the first, second, third, and fourth planetary gear sets each comprise single pinion planetary gear sets.

8. The planetary gear train of claim 6 , wherein the first, second, third, and fourth planetary gear sets are sequentially disposed from an engine side.

9. The planetary gear train of claim 6 , wherein gear shift stages, which are implemented by selectively operating the first, second, third, and fourth clutches and the first and second brakes, include:
a first forward gear shift stage implemented by simultaneously operating the second clutch and the first and second brakes;
a second forward gear shift stage implemented by simultaneously operating the first and second clutches and the second brake;
a third forward gear shift stage implemented by simultaneously operating the second and fourth clutches and the second brake;
a fourth forward gear shift stage implemented by simultaneously operating the first and fourth clutches and the second brake;
a fifth forward gear shift stage implemented by simultaneously operating the third and fourth clutches and the second brake;
a sixth forward gear shift stage implemented by simultaneously operating the first and third clutches and the second brake;
a seventh forward gear shift stage implemented by simultaneously operating the first, second, and third clutches;
an eighth forward gear shift stage implemented by simultaneously operating the first and third clutches and the first brake;
a ninth forward gear shift stage implemented by simultaneously operating the third and fourth clutches and the first brake;
a tenth forward gear shift stage implemented by simultaneously operating the first and fourth clutches and the first brake; and
a reverse gear shi

Assignees

• Hyundai Motor Co Ltd

Inventors

• Kook Jae Chang
• Hwang Seong Wook
• Shim Hyu Tae
• Ji Seongwook
• Cho Wonmin
• Seo Kangsoo
• Noh Myeong Hoon

Classifications

• F16H2200/2046

  with six engaging means · CPC title

• F16H2200/2012

  with four sets of orbital gears · CPC title

• F16H3/66 Primary

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

• F16H2200/0069

  the gear ratios comprising ten forward speeds · CPC title