Planetary gear train of automatic transmission of vehicle

Patent metadata

Field	Value
Publication number	US-9657815-B2
Application number	US-201514941409-A
Country	US
Kind code	B2
Filing date	Nov 13, 2015
Priority date	Apr 30, 2015
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

A planetary gear train for an automatic transmission may include an input shaft, an output shaft, first to fourth planetary gear sets and seven friction elements disposed to selectively connect the rotation elements with the rotation element and selectively connect the rotation elements with a transmission housing, and wherein the input shaft is continuously connected to the second rotation element, the output shaft is continuously connected to the eleventh rotation element, the first rotation element is continuously connected to the sixth rotation element, the first rotation element is continuously connected to the eighth rotation element, the first rotation element is continuously connected to the tenth rotation element, the fifth rotation element is continuously connected to the ninth rotation element, the output shaft is selectively connected to the third rotation element, and wherein three friction elements are operated for achieving ten forward speed stages and at least one reverse speed stage.

First claim

What is claimed is:

1. A planetary gear train for an automatic transmission of 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 rotation element, a second rotation element, and a third rotation element;
a second planetary gear set including a fourth rotation element, a fifth rotation element, and a sixth rotation element;
a third planetary gear set including a seventh rotation element, an eighth rotation element, and a ninth rotation element;
a fourth planetary gear set including a tenth rotation element, an eleventh rotation element, and a twelfth rotation element; and
seven friction elements disposed to selectively connect the rotation elements with the rotation element and selectively connect the rotation elements with a transmission housing, and
wherein the input shaft is continuously connected to the second rotation element,
the output shaft is continuously connected to the eleventh rotation element,
the first rotation element is continuously connected to the sixth rotation element,
the first rotation element is continuously connected to the eighth rotation element,
the first rotation element is continuously connected to the tenth rotation element,
the fifth rotation element is continuously connected to the ninth rotation element,
the output shaft is selectively connected to the third rotation element, and
wherein three friction elements among the seven friction elements are operated for achieving ten forward speed stages and at least one reverse speed stage.

2. The planetary gear train of claim 1 , wherein
the fifth rotation element is selectively connected to the transmission housing,
the fourth rotation element is selectively connected to the transmission housing,
the twelfth rotation element is selectively connected to the transmission housing,
the output shaft is selectively connected to the seventh rotation element,
the input shaft is selectively connected to the fifth rotation element, and
the input shaft is selectively connected to the fourth rotation element.

3. The planetary gear train of claim 1 , wherein
the first rotation element, the second rotation element, and the third rotation element of the first planetary gear set are a sun gear, a planet carrier, and a ring gear,
the fourth rotation element, the fifth rotation element, and the sixth rotation element of the second planetary gear set are a sun gear, a planet carrier, and a ring gear,
the seventh rotation element, the eighth rotation element, and the ninth rotation element of the third planetary gear set are a sun gear, a planet carrier, and a ring gear, and
the tenth rotation element, the eleventh rotation element, and the twelfth rotation element of the fourth planetary gear set are a sun gear, a planet carrier, and a ring gear.

4. A planetary gear train for an automatic transmission of 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 rotation element, a second rotation element, and a third rotation element;
a second planetary gear set including a fourth rotation element, a fifth rotation element, and a sixth rotation element;
a third planetary gear set including a seventh rotation element, an eighth rotation element, and a ninth rotation element;
a fourth planetary gear set including a tenth rotation element, an eleventh rotation element, and a twelfth rotation element;
seven friction elements disposed to selectively connect the rotation elements with the rotation element and selectively connect the rotation elements with a transmission housing;
a first rotation shaft including the first, sixth, eighth and tenth rotation elements;
a second rotation shaft including the second rotation element and directly connected to the input shaft;
a third rotation shaft including the third rotation element;
a fourth rotation shaft including the fourth rotation element, and the fourth rotation shaft selectively connected to the input shaft or the transmission housing;
a fifth rotation shaft including the fifth and ninth rotation elements, and the fifth rotation shaft selectively connected to the input shaft or the transmission housing;
a sixth rotation shaft including the seventh rotation element;
a seventh rotation shaft including the eleventh rotation element, and the seventh rotation shaft selectively connected to the third rotation shaft or sixth rotation shaft, and directly connected to the output shaft; and
an eighth rotation shaft including the twelfth rotation element and selectively connected to the transmission housing.

5. The planetary gear train of claim 4 , wherein
the first planetary gear set is a single-pinion planetary gear set, in which the first rotation element is a first sun gear, the second rotation element is a first planet carrier, and the third rotation element is a first ring gear,
the second planetary gear set is a single-pinion planetary gear set, in which the fourth rotation element is a second sun gear, the fifth rotation element is a second planet carrier, and the sixth rotation element is a second ring gear,
the third planetary gear set is a single-pinion planetary gear set, in which the seventh rotation element is a third sun gear, the eighth rotation element is a third planet carrier, and the ninth rotation element is a third ring gear, and
the fourth planetary gear set is a single-pinion planetary gear set, the tenth rotation element is a fourth sun gear, the eleventh rotation element is a fourth planet carrier, and the twelfth rotation element is a fourth ring gear.

6. The planetary gear train of claim 5 , wherein the first, second, third, fourth planetary gear sets are disposed in a sequence of the second, first, third and fourth planetary gear sets from an engine side.

7. The planetary gear train of claim 4 , wherein the seven friction elements comprise:
a first clutch selectively connecting the third and seventh rotation shafts;
a second clutch selectively connecting the sixth and seventh rotation shafts;
a third clutch selectively connecting the input shaft and the fifth rotation shaft;
a fourth clutch selectively connecting the input shaft and the fourth rotation shaft;
a first brake selectively connecting the fifth rotation shaft and the transmission housing;
a second brake selectively connecting the fourth rotation shaft and the transmission housing; and
a third brake selectively connecting the eighth rotation shaft and the transmission housing.

8. The planetary gear train of claim 7 , wherein shift speed stages are achieved by selectively operating the seven friction elements, and comprise:
a first forward speed stage achieved by simultaneous operation of the second and fourth clutches and the third brake;
a second forward speed stage achieved by simultaneous operation of the second and third clutches and the third brake;
a third forward speed stage achieved by simultaneous operation of the third and fourth clutches and the third brake;
a fourth forward speed stage achieved by simultaneous operation of the third clutch and the second and the third brakes;
a fifth forward speed stage achieved by simultaneous operation of the first clutch and the second and the third brakes;
a sixth forward speed stage achieved by simultaneous operation of the first and third clutches and the second brake;
a seventh forward speed stage achieved by simultaneous operation of the first, second and third clutches;
an eighth forward speed stage achieved by simultaneous operation of the first and second clutches and the first brake;
a ninth forward speed stage achieved by simult

Assignees

• Hyundai Motor Co Ltd

Inventors

• Lee Kyeonghun
• Lee Chang Wook
• Park Jongsool
• Lee Sueng Ho
• Hwang Dong Hwan

Classifications

• F16H2200/2048

  with seven engaging means · CPC title

• F16H2200/0069

  the gear ratios comprising ten forward speeds · 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