Planetary gear train of automatic transmission for vehicle

Patent metadata

Field	Value
Publication number	US-9528574-B2
Application number	US-201514878615-A
Country	US
Kind code	B2
Filing date	Oct 8, 2015
Priority date	Dec 11, 2014
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

A planetary gear train of an automatic transmission for a vehicle may include an input shaft receiving torque of an engine, an output shaft outputting changed torque, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, a first rotation shaft selectively connected to a transmission housing, a second rotation shaft, a third rotation shaft selectively connected to the transmission housing, a fourth rotation shaft directly connected to the input shaft, a fifth rotation shaft, a sixth rotation shaft selectively connected to the second rotation shaft or the fifth rotation shaft, a seventh rotation shaft selectively connected to the input shaft, and an eighth rotation shaft directly connected to the output shaft, and selectively connected to the sixth rotation shaft.

First claim

What is claimed is:

1. A planetary gear train of an automatic transmission for a vehicle, comprising:
an input shaft receiving torque of an engine;
an output shaft outputting changed torque;
a first planetary gear set including a first sun gear, a first planet carrier, and a first ring gear;
a second planetary gear set including a second sun gear, a second planet carrier, and a second ring gear;
a third planetary gear set including a third sun gear, a third planet carrier, and a third ring gear;
a fourth planetary gear set including a fourth sun gear, a fourth planet carrier, and a fourth ring gear;
a first rotation shaft including the first and second sun gears and selectively connected to a transmission housing;
a second rotation shaft including the first planet carrier and the fourth ring gear;
a third rotation shaft including the first ring gear and selectively connected to the transmission housing;
a fourth rotation shaft including the second planet carrier and directly connected to the input shaft;
a fifth rotation shaft including the second ring gear and the third sun gear;
a sixth rotation shaft including the third planet carrier and selectively connected to the second rotation shaft or the fifth rotation shaft;
a seventh rotation shaft including the third ring gear and the fourth sun gear and selectively connected to the input shaft; and
an eighth rotation shaft including the fourth planet carrier, directly connected to the output shaft, and selectively connected to the sixth rotation shaft.

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

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

4. The planetary gear train of claim 1 , further comprising:
a first clutch interposed between the input shaft and the seventh rotation shaft;
a second clutch interposed between the sixth rotation shaft and the eighth rotation shaft;
a third clutch interposed between the fifth rotation shaft and the sixth rotation shaft;
a fourth clutch interposed between the second rotation shaft and the sixth rotation shaft;
a first brake interposed between the first rotation shaft and the transmission housing; and
a second brake interposed between the third rotation shaft and the transmission housing.

5. The planetary gear train of claim 4 , wherein a first forward speed stage is achieved by operation of the first clutch and the first and second brakes, a second forward speed stage is achieved by operation of the third clutch and the first and second brakes,
a third forward speed stage is achieved by operation of the first and third clutches and the second brake,
a fourth forward speed stage is achieved by operation of the second and third clutches and the second brake,
a fifth forward speed stage is achieved by operation of the first and second clutches and the second brake,
a sixth forward speed stage is achieved by operation of the first and fourth clutches and the second brake,
a seventh forward speed stage is achieved by operation of the first, second, and fourth clutches,
an eighth forward speed stage is achieved by operation of the first and fourth clutches and the first brake,
a ninth forward speed stage is achieved by operation of the first and second clutches and the first brake,
a tenth forward speed stage is achieved by operation of the second and third clutches and the first brake, and
a reverse speed stage is achieved by operation of the fourth clutch and the first and second brakes.

6. A planetary gear train of an automatic transmission for a vehicle, comprising:
an input shaft receiving torque of an engine;
an output shaft outputting changed torque;
a first planetary gear set including a first sun gear, a first planet carrier, and a first ring gear;
a second planetary gear set including a second sun gear, a second planet carrier, and a second ring gear;
a third planetary gear set including a third sun gear, a third planet carrier, and a third ring gear; and
a fourth planetary gear set including 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,
the output shaft is directly connected to the fourth planet carrier,
the first sun gear is directly connected to the second sun gear,
the first planet carrier is directly connected to the fourth ring gear,
the second ring gear is directly connected to the third sun gear,
the third ring gear is directly connected to the fourth sun gear,
the fourth sun gear is selectively connected to the input shaft,
the third planet carrier is selectively connected to the fourth planet carrier,
the second ring gear and the third sun gear are selectively connected to the third planet carrier,
the first planet carrier and the fourth ring gear are selectively connected to the third planet carrier,
the first sun gear and the second sun gear are selectively connected to a transmission housing, and
the first ring gear is selectively connected to the transmission housing.

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

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

9. The planetary gear train of claim 6 , further comprising:
a first clutch selectively connecting the fourth sun gear to the input shaft;
a second clutch selectively connecting the third planet carrier to the fourth planet carrier;
a third clutch selectively connecting the second ring gear and the third sun gear to the third planet carrier;
a fourth clutch selectively connecting the first planet carrier and the fourth ring gear to the third planet carrier;
a first brake selectively connecting the first sun gear and the second sun gear to the transmission housing; and
a second brake selectively connecting the first ring gear to the transmission housing.

10. The planetary gear train of claim 9 , wherein a first forward speed stage is achieved by operation of the first clutch and the first and second brakes,
a second forward speed stage is achieved by operation of the third clutch and the first and second brakes,
a third forward speed stage is achieved by operation of the first and third clutches and the second brake,
a fourth forward speed stage is achieved by operation of the second and third clutches and the second brake,
a fifth forward speed stage is achieved by operation of the first and second clutches and the second brake,
a sixth forward speed stage is achieved by operation of the first and fourth clutches and the second brake,
a seventh forward speed stage is achieved by operation of the first, second, and fourth clutches,
an eighth forward speed stage is achieved by operation of the first and fourth clutches and the first brake,
a ninth forward speed stage is achieved by operation of the first and second clutches and the first brake,
a tenth forward speed stage is achieved by operation of the second and third clutches and the first brake, and
a reverse speed stage is achieved by operation of the fourth clutch and the first and second brakes.

Assignees

• Hyundai Motor Co Ltd

Inventors

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

Classifications

• F16H3/66 Primary

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

• F16H2200/2012

  with four sets of orbital gears · CPC title

• F16H2200/2046

  with six engaging means · CPC title

• F16H2200/0069

  the gear ratios comprising ten forward speeds · CPC title

• F16H2306/00

  Shifting · CPC title